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86ef235216
cve-2024-38477/httpd-2.4.59/modules/proxy/proxy_util.c
gbucchino 86ef235216 First commit
2025-06-05 15:09:30 +02:00

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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* Utility routines for Apache proxy */
#include "mod_proxy.h"
#include "ap_mpm.h"
#include "scoreboard.h"
#include "apr_version.h"
#include "apr_strings.h"
#include "apr_hash.h"
#include "apr_atomic.h"
#include "http_core.h"
#include "proxy_util.h"
#include "ajp.h"
#include "scgi.h"
#include "mpm_common.h" /* for ap_max_mem_free */
#include "mod_http2.h" /* for http2_get_num_workers() */
#if APR_HAVE_UNISTD_H
#include <unistd.h> /* for getpid() */
#endif
#if APR_HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#if (APR_MAJOR_VERSION < 2)
#include "apr_support.h" /* for apr_wait_for_io_or_timeout() */
#endif
APLOG_USE_MODULE(proxy);
/*
* Opaque structure containing target server info when
* using a forward proxy.
* Up to now only used in combination with HTTP CONNECT to ProxyRemote
*/
typedef struct {
int use_http_connect; /* Use SSL Tunneling via HTTP CONNECT */
const char *target_host; /* Target hostname */
apr_port_t target_port; /* Target port */
const char *proxy_auth; /* Proxy authorization */
} forward_info;
/*
* Opaque structure containing a refcounted and TTL'ed address.
*/
typedef struct proxy_address {
apr_sockaddr_t *addr; /* Remote address info */
const char *hostname; /* Remote host name */
apr_port_t hostport; /* Remote host port */
apr_uint32_t refcount; /* Number of conns and/or worker using it */
apr_uint32_t expiry; /* Expiry timestamp (seconds to proxy_start_time) */
} proxy_address;
/* Global balancer counter */
int PROXY_DECLARE_DATA proxy_lb_workers = 0;
static int lb_workers_limit = 0;
const apr_strmatch_pattern PROXY_DECLARE_DATA *ap_proxy_strmatch_path;
const apr_strmatch_pattern PROXY_DECLARE_DATA *ap_proxy_strmatch_domain;
extern apr_global_mutex_t *proxy_mutex;
static const apr_time_t *proxy_start_time; /* epoch for expiring addresses */
static int proxy_match_ipaddr(struct dirconn_entry *This, request_rec *r);
static int proxy_match_domainname(struct dirconn_entry *This, request_rec *r);
static int proxy_match_hostname(struct dirconn_entry *This, request_rec *r);
static int proxy_match_word(struct dirconn_entry *This, request_rec *r);
static int ap_proxy_retry_worker(const char *proxy_function, proxy_worker *worker, server_rec *s);
static proxy_worker *proxy_balancer_get_best_worker(proxy_balancer *balancer,
request_rec *r,
proxy_is_best_callback_fn_t *is_best,
void *baton);
APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(proxy, PROXY, int, create_req,
(request_rec *r, request_rec *pr), (r, pr),
OK, DECLINED)
PROXY_DECLARE(apr_status_t) ap_proxy_strncpy(char *dst, const char *src,
apr_size_t dlen)
{
char *thenil;
apr_size_t thelen;
/* special case handling */
if (!dlen) {
/* XXX: APR_ENOSPACE would be better */
return APR_EGENERAL;
}
if (!src) {
*dst = '\0';
return APR_SUCCESS;
}
thenil = apr_cpystrn(dst, src, dlen);
thelen = thenil - dst;
if (src[thelen] == '\0') {
return APR_SUCCESS;
}
return APR_EGENERAL;
}
/* already called in the knowledge that the characters are hex digits */
PROXY_DECLARE(int) ap_proxy_hex2c(const char *x)
{
int i;
#if !APR_CHARSET_EBCDIC
int ch = x[0];
if (apr_isdigit(ch)) {
i = ch - '0';
}
else if (apr_isupper(ch)) {
i = ch - ('A' - 10);
}
else {
i = ch - ('a' - 10);
}
i <<= 4;
ch = x[1];
if (apr_isdigit(ch)) {
i += ch - '0';
}
else if (apr_isupper(ch)) {
i += ch - ('A' - 10);
}
else {
i += ch - ('a' - 10);
}
return i;
#else /*APR_CHARSET_EBCDIC*/
/*
* we assume that the hex value refers to an ASCII character
* so convert to EBCDIC so that it makes sense locally;
*
* example:
*
* client specifies %20 in URL to refer to a space char;
* at this point we're called with EBCDIC "20"; after turning
* EBCDIC "20" into binary 0x20, we then need to assume that 0x20
* represents an ASCII char and convert 0x20 to EBCDIC, yielding
* 0x40
*/
char buf[1];
if (1 == sscanf(x, "%2x", &i)) {
buf[0] = i & 0xFF;
ap_xlate_proto_from_ascii(buf, 1);
return buf[0];
}
else {
return 0;
}
#endif /*APR_CHARSET_EBCDIC*/
}
PROXY_DECLARE(void) ap_proxy_c2hex(int ch, char *x)
{
#if !APR_CHARSET_EBCDIC
int i;
x[0] = '%';
i = (ch & 0xF0) >> 4;
if (i >= 10) {
x[1] = ('A' - 10) + i;
}
else {
x[1] = '0' + i;
}
i = ch & 0x0F;
if (i >= 10) {
x[2] = ('A' - 10) + i;
}
else {
x[2] = '0' + i;
}
#else /*APR_CHARSET_EBCDIC*/
static const char ntoa[] = { "0123456789ABCDEF" };
char buf[1];
ch &= 0xFF;
buf[0] = ch;
ap_xlate_proto_to_ascii(buf, 1);
x[0] = '%';
x[1] = ntoa[(buf[0] >> 4) & 0x0F];
x[2] = ntoa[buf[0] & 0x0F];
x[3] = '\0';
#endif /*APR_CHARSET_EBCDIC*/
}
/*
* canonicalise a URL-encoded string
*/
/*
* Convert a URL-encoded string to canonical form.
* It decodes characters which need not be encoded,
* and encodes those which must be encoded, and does not touch
* those which must not be touched.
*/
PROXY_DECLARE(char *)ap_proxy_canonenc_ex(apr_pool_t *p, const char *x, int len,
enum enctype t, int flags,
int proxyreq)
{
int i, j, ch;
char *y;
char *allowed; /* characters which should not be encoded */
char *reserved; /* characters which much not be en/de-coded */
int forcedec = flags & PROXY_CANONENC_FORCEDEC;
int noencslashesenc = flags & PROXY_CANONENC_NOENCODEDSLASHENCODING;
/*
* N.B. in addition to :@&=, this allows ';' in an http path
* and '?' in an ftp path -- this may be revised
*
* Also, it makes a '+' character in a search string reserved, as
* it may be form-encoded. (Although RFC 1738 doesn't allow this -
* it only permits ; / ? : @ = & as reserved chars.)
*/
if (t == enc_path) {
allowed = "~$-_.+!*'(),;:@&=";
}
else if (t == enc_search) {
allowed = "$-_.!*'(),;:@&=";
}
else if (t == enc_user) {
allowed = "$-_.+!*'(),;@&=";
}
else if (t == enc_fpath) {
allowed = "$-_.+!*'(),?:@&=";
}
else { /* if (t == enc_parm) */
allowed = "$-_.+!*'(),?/:@&=";
}
if (t == enc_path) {
reserved = "/";
}
else if (t == enc_search) {
reserved = "+";
}
else {
reserved = "";
}
y = apr_palloc(p, 3 * len + 1);
for (i = 0, j = 0; i < len; i++, j++) {
/* always handle '/' first */
ch = x[i];
if (strchr(reserved, ch)) {
y[j] = ch;
continue;
}
/*
* decode it if not already done. do not decode reverse proxied URLs
* unless specifically forced
*/
if ((forcedec || noencslashesenc
|| (proxyreq && proxyreq != PROXYREQ_REVERSE)) && ch == '%') {
if (!apr_isxdigit(x[i + 1]) || !apr_isxdigit(x[i + 2])) {
return NULL;
}
ch = ap_proxy_hex2c(&x[i + 1]);
if (ch != 0 && strchr(reserved, ch)) { /* keep it encoded */
y[j++] = x[i++];
y[j++] = x[i++];
y[j] = x[i];
continue;
}
if (noencslashesenc && !forcedec && (proxyreq == PROXYREQ_REVERSE)) {
/*
* In the reverse proxy case when we only want to keep encoded
* slashes untouched revert back to '%' which will cause
* '%' to be encoded in the following.
*/
ch = '%';
}
else {
i += 2;
}
}
/* recode it, if necessary */
if (!apr_isalnum(ch) && !strchr(allowed, ch)) {
ap_proxy_c2hex(ch, &y[j]);
j += 2;
}
else {
y[j] = ch;
}
}
y[j] = '\0';
return y;
}
/*
* Convert a URL-encoded string to canonical form.
* It decodes characters which need not be encoded,
* and encodes those which must be encoded, and does not touch
* those which must not be touched.
*/
PROXY_DECLARE(char *)ap_proxy_canonenc(apr_pool_t *p, const char *x, int len,
enum enctype t, int forcedec,
int proxyreq)
{
int flags;
flags = forcedec ? PROXY_CANONENC_FORCEDEC : 0;
return ap_proxy_canonenc_ex(p, x, len, t, flags, proxyreq);
}
/*
* Parses network-location.
* urlp on input the URL; on output the path, after the leading /
* user NULL if no user/password permitted
* password holder for password
* host holder for host
* port port number; only set if one is supplied.
*
* Returns an error string.
*/
PROXY_DECLARE(char *)
ap_proxy_canon_netloc(apr_pool_t *p, char **const urlp, char **userp,
char **passwordp, char **hostp, apr_port_t *port)
{
char *addr, *scope_id, *strp, *host, *url = *urlp;
char *user = NULL, *password = NULL;
apr_port_t tmp_port;
apr_status_t rv;
if (url[0] != '/' || url[1] != '/') {
return "Malformed URL";
}
host = url + 2;
url = strchr(host, '/');
if (url == NULL) {
url = "";
}
else {
*(url++) = '\0'; /* skip separating '/' */
}
/* find _last_ '@' since it might occur in user/password part */
strp = strrchr(host, '@');
if (strp != NULL) {
*strp = '\0';
user = host;
host = strp + 1;
/* find password */
strp = strchr(user, ':');
if (strp != NULL) {
*strp = '\0';
password = ap_proxy_canonenc(p, strp + 1, strlen(strp + 1), enc_user, 1, 0);
if (password == NULL) {
return "Bad %-escape in URL (password)";
}
}
user = ap_proxy_canonenc(p, user, strlen(user), enc_user, 1, 0);
if (user == NULL) {
return "Bad %-escape in URL (username)";
}
}
if (userp != NULL) {
*userp = user;
}
if (passwordp != NULL) {
*passwordp = password;
}
/*
* Parse the host string to separate host portion from optional port.
* Perform range checking on port.
*/
rv = apr_parse_addr_port(&addr, &scope_id, &tmp_port, host, p);
if (rv != APR_SUCCESS || addr == NULL || scope_id != NULL) {
return "Invalid host/port";
}
if (tmp_port != 0) { /* only update caller's port if port was specified */
*port = tmp_port;
}
ap_str_tolower(addr); /* DNS names are case-insensitive */
*urlp = url;
*hostp = addr;
return NULL;
}
static int proxyerror_core(request_rec *r, int statuscode, const char *message,
apr_status_t rv)
{
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00898)
"%s returned by %s", message, r->uri);
apr_table_setn(r->notes, "error-notes",
apr_pstrcat(r->pool,
"The proxy server could not handle the request<p>"
"Reason: <strong>", ap_escape_html(r->pool, message),
"</strong></p>",
NULL));
/* Allow "error-notes" string to be printed by ap_send_error_response() */
apr_table_setn(r->notes, "verbose-error-to", "*");
r->status_line = apr_psprintf(r->pool, "%3.3u Proxy Error", statuscode);
return statuscode;
}
PROXY_DECLARE(int) ap_proxyerror(request_rec *r, int statuscode, const char *message)
{
return proxyerror_core(r, statuscode, message, 0);
}
static const char *
proxy_get_host_of_request(request_rec *r)
{
char *url, *user = NULL, *password = NULL, *err, *host = NULL;
apr_port_t port;
if (r->hostname != NULL) {
return r->hostname;
}
/* Set url to the first char after "scheme://" */
if ((url = strchr(r->uri, ':')) == NULL || url[1] != '/' || url[2] != '/') {
return NULL;
}
url = apr_pstrdup(r->pool, &url[1]); /* make it point to "//", which is what proxy_canon_netloc expects */
err = ap_proxy_canon_netloc(r->pool, &url, &user, &password, &host, &port);
if (err != NULL) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00899) "%s", err);
}
r->hostname = host;
return host; /* ought to return the port, too */
}
/* Return TRUE if addr represents an IP address (or an IP network address) */
PROXY_DECLARE(int) ap_proxy_is_ipaddr(struct dirconn_entry *This, apr_pool_t *p)
{
const char *addr = This->name;
long ip_addr[4];
int i, quads;
long bits;
/*
* if the address is given with an explicit netmask, use that
* Due to a deficiency in apr_inet_addr(), it is impossible to parse
* "partial" addresses (with less than 4 quads) correctly, i.e.
* 192.168.123 is parsed as 192.168.0.123, which is not what I want.
* I therefore have to parse the IP address manually:
* if (proxy_readmask(This->name, &This->addr.s_addr, &This->mask.s_addr) == 0)
* addr and mask were set by proxy_readmask()
* return 1;
*/
/*
* Parse IP addr manually, optionally allowing
* abbreviated net addresses like 192.168.
*/
/* Iterate over up to 4 (dotted) quads. */
for (quads = 0; quads < 4 && *addr != '\0'; ++quads) {
char *tmp;
if (*addr == '/' && quads > 0) { /* netmask starts here. */
break;
}
if (!apr_isdigit(*addr)) {
return 0; /* no digit at start of quad */
}
ip_addr[quads] = strtol(addr, &tmp, 0);
if (tmp == addr) { /* expected a digit, found something else */
return 0;
}
if (ip_addr[quads] < 0 || ip_addr[quads] > 255) {
/* invalid octet */
return 0;
}
addr = tmp;
if (*addr == '.' && quads != 3) {
++addr; /* after the 4th quad, a dot would be illegal */
}
}
for (This->addr.s_addr = 0, i = 0; i < quads; ++i) {
This->addr.s_addr |= htonl(ip_addr[i] << (24 - 8 * i));
}
if (addr[0] == '/' && apr_isdigit(addr[1])) { /* net mask follows: */
char *tmp;
++addr;
bits = strtol(addr, &tmp, 0);
if (tmp == addr) { /* expected a digit, found something else */
return 0;
}
addr = tmp;
if (bits < 0 || bits > 32) { /* netmask must be between 0 and 32 */
return 0;
}
}
else {
/*
* Determine (i.e., "guess") netmask by counting the
* number of trailing .0's; reduce #quads appropriately
* (so that 192.168.0.0 is equivalent to 192.168.)
*/
while (quads > 0 && ip_addr[quads - 1] == 0) {
--quads;
}
/* "IP Address should be given in dotted-quad form, optionally followed by a netmask (e.g., 192.168.111.0/24)"; */
if (quads < 1) {
return 0;
}
/* every zero-byte counts as 8 zero-bits */
bits = 8 * quads;
if (bits != 32) { /* no warning for fully qualified IP address */
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00900)
"Warning: NetMask not supplied with IP-Addr; guessing: %s/%ld",
inet_ntoa(This->addr), bits);
}
}
This->mask.s_addr = htonl(APR_INADDR_NONE << (32 - bits));
if (*addr == '\0' && (This->addr.s_addr & ~This->mask.s_addr) != 0) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00901)
"Warning: NetMask and IP-Addr disagree in %s/%ld",
inet_ntoa(This->addr), bits);
This->addr.s_addr &= This->mask.s_addr;
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00902)
" Set to %s/%ld", inet_ntoa(This->addr), bits);
}
if (*addr == '\0') {
This->matcher = proxy_match_ipaddr;
return 1;
}
else {
return (*addr == '\0'); /* okay iff we've parsed the whole string */
}
}
/* Return TRUE if addr represents an IP address (or an IP network address) */
static int proxy_match_ipaddr(struct dirconn_entry *This, request_rec *r)
{
int i, ip_addr[4];
struct in_addr addr, *ip;
const char *host = proxy_get_host_of_request(r);
if (host == NULL) { /* oops! */
return 0;
}
memset(&addr, '\0', sizeof addr);
memset(ip_addr, '\0', sizeof ip_addr);
if (4 == sscanf(host, "%d.%d.%d.%d", &ip_addr[0], &ip_addr[1], &ip_addr[2], &ip_addr[3])) {
for (addr.s_addr = 0, i = 0; i < 4; ++i) {
/* ap_proxy_is_ipaddr() already confirmed that we have
* a valid octet in ip_addr[i]
*/
addr.s_addr |= htonl(ip_addr[i] << (24 - 8 * i));
}
if (This->addr.s_addr == (addr.s_addr & This->mask.s_addr)) {
#if DEBUGGING
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00903)
"1)IP-Match: %s[%s] <-> ", host, inet_ntoa(addr));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00904)
"%s/", inet_ntoa(This->addr));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00905)
"%s", inet_ntoa(This->mask));
#endif
return 1;
}
#if DEBUGGING
else {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00906)
"1)IP-NoMatch: %s[%s] <-> ", host, inet_ntoa(addr));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00907)
"%s/", inet_ntoa(This->addr));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00908)
"%s", inet_ntoa(This->mask));
}
#endif
}
else {
struct apr_sockaddr_t *reqaddr;
if (apr_sockaddr_info_get(&reqaddr, host, APR_UNSPEC, 0, 0, r->pool)
!= APR_SUCCESS) {
#if DEBUGGING
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00909)
"2)IP-NoMatch: hostname=%s msg=Host not found", host);
#endif
return 0;
}
/* Try to deal with multiple IP addr's for a host */
/* FIXME: This needs to be able to deal with IPv6 */
while (reqaddr) {
ip = (struct in_addr *) reqaddr->ipaddr_ptr;
if (This->addr.s_addr == (ip->s_addr & This->mask.s_addr)) {
#if DEBUGGING
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00910)
"3)IP-Match: %s[%s] <-> ", host, inet_ntoa(*ip));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00911)
"%s/", inet_ntoa(This->addr));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00912)
"%s", inet_ntoa(This->mask));
#endif
return 1;
}
#if DEBUGGING
else {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00913)
"3)IP-NoMatch: %s[%s] <-> ", host, inet_ntoa(*ip));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00914)
"%s/", inet_ntoa(This->addr));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00915)
"%s", inet_ntoa(This->mask));
}
#endif
reqaddr = reqaddr->next;
}
}
return 0;
}
/* Return TRUE if addr represents a domain name */
PROXY_DECLARE(int) ap_proxy_is_domainname(struct dirconn_entry *This, apr_pool_t *p)
{
char *addr = This->name;
int i;
/* Domain name must start with a '.' */
if (addr[0] != '.') {
return 0;
}
/* rfc1035 says DNS names must consist of "[-a-zA-Z0-9]" and '.' */
for (i = 0; apr_isalnum(addr[i]) || addr[i] == '-' || addr[i] == '.'; ++i) {
continue;
}
#if 0
if (addr[i] == ':') {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(03234)
"@@@@ handle optional port in proxy_is_domainname()");
/* @@@@ handle optional port */
}
#endif
if (addr[i] != '\0') {
return 0;
}
/* Strip trailing dots */
for (i = strlen(addr) - 1; i > 0 && addr[i] == '.'; --i) {
addr[i] = '\0';
}
This->matcher = proxy_match_domainname;
return 1;
}
/* Return TRUE if host "host" is in domain "domain" */
static int proxy_match_domainname(struct dirconn_entry *This, request_rec *r)
{
const char *host = proxy_get_host_of_request(r);
int d_len = strlen(This->name), h_len;
if (host == NULL) { /* some error was logged already */
return 0;
}
h_len = strlen(host);
/* @@@ do this within the setup? */
/* Ignore trailing dots in domain comparison: */
while (d_len > 0 && This->name[d_len - 1] == '.') {
--d_len;
}
while (h_len > 0 && host[h_len - 1] == '.') {
--h_len;
}
return h_len > d_len
&& strncasecmp(&host[h_len - d_len], This->name, d_len) == 0;
}
/* Return TRUE if host represents a host name */
PROXY_DECLARE(int) ap_proxy_is_hostname(struct dirconn_entry *This, apr_pool_t *p)
{
struct apr_sockaddr_t *addr;
char *host = This->name;
int i;
/* Host names must not start with a '.' */
if (host[0] == '.') {
return 0;
}
/* rfc1035 says DNS names must consist of "[-a-zA-Z0-9]" and '.' */
for (i = 0; apr_isalnum(host[i]) || host[i] == '-' || host[i] == '.'; ++i);
if (host[i] != '\0' || apr_sockaddr_info_get(&addr, host, APR_UNSPEC, 0, 0, p) != APR_SUCCESS) {
return 0;
}
This->hostaddr = addr;
/* Strip trailing dots */
for (i = strlen(host) - 1; i > 0 && host[i] == '.'; --i) {
host[i] = '\0';
}
This->matcher = proxy_match_hostname;
return 1;
}
/* Return TRUE if host "host" is equal to host2 "host2" */
static int proxy_match_hostname(struct dirconn_entry *This, request_rec *r)
{
char *host = This->name;
const char *host2 = proxy_get_host_of_request(r);
int h2_len;
int h1_len;
if (host == NULL || host2 == NULL) {
return 0; /* oops! */
}
h2_len = strlen(host2);
h1_len = strlen(host);
#if 0
struct apr_sockaddr_t *addr = *This->hostaddr;
/* Try to deal with multiple IP addr's for a host */
while (addr) {
if (addr->ipaddr_ptr == ? ? ? ? ? ? ? ? ? ? ? ? ?)
return 1;
addr = addr->next;
}
#endif
/* Ignore trailing dots in host2 comparison: */
while (h2_len > 0 && host2[h2_len - 1] == '.') {
--h2_len;
}
while (h1_len > 0 && host[h1_len - 1] == '.') {
--h1_len;
}
return h1_len == h2_len
&& strncasecmp(host, host2, h1_len) == 0;
}
/* Return TRUE if addr is to be matched as a word */
PROXY_DECLARE(int) ap_proxy_is_word(struct dirconn_entry *This, apr_pool_t *p)
{
This->matcher = proxy_match_word;
return 1;
}
/* Return TRUE if string "str2" occurs literally in "str1" */
static int proxy_match_word(struct dirconn_entry *This, request_rec *r)
{
const char *host = proxy_get_host_of_request(r);
return host != NULL && ap_strstr_c(host, This->name) != NULL;
}
/* Backwards-compatible interface. */
PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *conf,
apr_sockaddr_t *uri_addr)
{
return ap_proxy_checkproxyblock2(r, conf, uri_addr->hostname, uri_addr);
}
#define MAX_IP_STR_LEN (46)
PROXY_DECLARE(int) ap_proxy_checkproxyblock2(request_rec *r, proxy_server_conf *conf,
const char *hostname, apr_sockaddr_t *addr)
{
int j;
/* XXX FIXME: conf->noproxies->elts is part of an opaque structure */
for (j = 0; j < conf->noproxies->nelts; j++) {
struct noproxy_entry *npent = (struct noproxy_entry *) conf->noproxies->elts;
struct apr_sockaddr_t *conf_addr;
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
"checking remote machine [%s] against [%s]",
hostname, npent[j].name);
if (ap_strstr_c(hostname, npent[j].name) || npent[j].name[0] == '*') {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(00916)
"connect to remote machine %s blocked: name %s "
"matched", hostname, npent[j].name);
return HTTP_FORBIDDEN;
}
/* No IP address checks if no IP address was passed in,
* i.e. the forward address proxy case, where this server does
* not resolve the hostname. */
if (!addr)
continue;
for (conf_addr = npent[j].addr; conf_addr; conf_addr = conf_addr->next) {
char caddr[MAX_IP_STR_LEN], uaddr[MAX_IP_STR_LEN];
apr_sockaddr_t *uri_addr;
if (apr_sockaddr_ip_getbuf(caddr, sizeof caddr, conf_addr))
continue;
for (uri_addr = addr; uri_addr; uri_addr = uri_addr->next) {
if (apr_sockaddr_ip_getbuf(uaddr, sizeof uaddr, uri_addr))
continue;
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
"ProxyBlock comparing %s and %s", caddr, uaddr);
if (!strcmp(caddr, uaddr)) {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(00917)
"connect to remote machine %s blocked: "
"IP %s matched", hostname, caddr);
return HTTP_FORBIDDEN;
}
}
}
}
return OK;
}
/* set up the minimal filter set */
PROXY_DECLARE(int) ap_proxy_pre_http_request(conn_rec *c, request_rec *r)
{
ap_add_input_filter("HTTP_IN", NULL, r, c);
return OK;
}
PROXY_DECLARE(const char *) ap_proxy_location_reverse_map(request_rec *r,
proxy_dir_conf *conf, const char *url)
{
proxy_req_conf *rconf;
struct proxy_alias *ent;
int i, l1, l1_orig, l2;
char *u;
/*
* XXX FIXME: Make sure this handled the ambiguous case of the :<PORT>
* after the hostname
* XXX FIXME: Ensure the /uri component is a case sensitive match
*/
if (r->proxyreq != PROXYREQ_REVERSE) {
return url;
}
l1_orig = strlen(url);
if (conf->interpolate_env == 1) {
rconf = ap_get_module_config(r->request_config, &proxy_module);
ent = (struct proxy_alias *)rconf->raliases->elts;
}
else {
ent = (struct proxy_alias *)conf->raliases->elts;
}
for (i = 0; i < conf->raliases->nelts; i++) {
proxy_server_conf *sconf = (proxy_server_conf *)
ap_get_module_config(r->server->module_config, &proxy_module);
proxy_balancer *balancer;
const char *real = ent[i].real;
/* Restore the url length, if it had been changed by the code below */
l1 = l1_orig;
/*
* First check if mapping against a balancer and see
* if we have such a entity. If so, then we need to
* find the particulars of the actual worker which may
* or may not be the right one... basically, we need
* to find which member actually handled this request.
*/
if (ap_proxy_valid_balancer_name((char *)real, 0) &&
(balancer = ap_proxy_get_balancer(r->pool, sconf, real, 1))) {
int n, l3 = 0;
proxy_worker **worker = (proxy_worker **)balancer->workers->elts;
const char *urlpart = ap_strchr_c(real + sizeof(BALANCER_PREFIX) - 1, '/');
if (urlpart) {
if (!urlpart[1])
urlpart = NULL;
else
l3 = strlen(urlpart);
}
/* The balancer comparison is a bit trickier. Given the context
* BalancerMember balancer://alias http://example.com/foo
* ProxyPassReverse /bash balancer://alias/bar
* translate url http://example.com/foo/bar/that to /bash/that
*/
for (n = 0; n < balancer->workers->nelts; n++) {
l2 = strlen((*worker)->s->name_ex);
if (urlpart) {
/* urlpart (l3) assuredly starts with its own '/' */
if ((*worker)->s->name_ex[l2 - 1] == '/')
--l2;
if (l1 >= l2 + l3
&& strncasecmp((*worker)->s->name_ex, url, l2) == 0
&& strncmp(urlpart, url + l2, l3) == 0) {
u = apr_pstrcat(r->pool, ent[i].fake, &url[l2 + l3],
NULL);
return ap_is_url(u) ? u : ap_construct_url(r->pool, u, r);
}
}
else if (l1 >= l2 && strncasecmp((*worker)->s->name_ex, url, l2) == 0) {
/* edge case where fake is just "/"... avoid double slash */
if ((ent[i].fake[0] == '/') && (ent[i].fake[1] == 0) && (url[l2] == '/')) {
u = apr_pstrdup(r->pool, &url[l2]);
} else {
u = apr_pstrcat(r->pool, ent[i].fake, &url[l2], NULL);
}
return ap_is_url(u) ? u : ap_construct_url(r->pool, u, r);
}
worker++;
}
}
else {
const char *part = url;
l2 = strlen(real);
if (real[0] == '/') {
part = ap_strstr_c(url, "://");
if (part) {
part = ap_strchr_c(part+3, '/');
if (part) {
l1 = strlen(part);
}
else {
part = url;
}
}
else {
part = url;
}
}
if (l2 > 0 && l1 >= l2 && strncasecmp(real, part, l2) == 0) {
u = apr_pstrcat(r->pool, ent[i].fake, &part[l2], NULL);
return ap_is_url(u) ? u : ap_construct_url(r->pool, u, r);
}
}
}
return url;
}
/*
* Cookies are a bit trickier to match: we've got two substrings to worry
* about, and we can't just find them with strstr 'cos of case. Regexp
* matching would be an easy fix, but for better consistency with all the
* other matches we'll refrain and use apr_strmatch to find path=/domain=
* and stick to plain strings for the config values.
*/
PROXY_DECLARE(const char *) ap_proxy_cookie_reverse_map(request_rec *r,
proxy_dir_conf *conf, const char *str)
{
proxy_req_conf *rconf = ap_get_module_config(r->request_config,
&proxy_module);
struct proxy_alias *ent;
apr_size_t len = strlen(str);
const char *newpath = NULL;
const char *newdomain = NULL;
const char *pathp;
const char *domainp;
const char *pathe = NULL;
const char *domaine = NULL;
apr_size_t l1, l2, poffs = 0, doffs = 0;
int i;
int ddiff = 0;
int pdiff = 0;
char *tmpstr, *tmpstr_orig, *token, *last, *ret;
if (r->proxyreq != PROXYREQ_REVERSE) {
return str;
}
/*
* Find the match and replacement, but save replacing until we've done
* both path and domain so we know the new strlen
*/
tmpstr_orig = tmpstr = apr_pstrdup(r->pool, str);
while ((token = apr_strtok(tmpstr, ";", &last))) {
/* skip leading spaces */
while (apr_isspace(*token)) {
++token;
}
if (ap_cstr_casecmpn("path=", token, 5) == 0) {
pathp = token + 5;
poffs = pathp - tmpstr_orig;
l1 = strlen(pathp);
pathe = str + poffs + l1;
if (conf->interpolate_env == 1) {
ent = (struct proxy_alias *)rconf->cookie_paths->elts;
}
else {
ent = (struct proxy_alias *)conf->cookie_paths->elts;
}
for (i = 0; i < conf->cookie_paths->nelts; i++) {
l2 = strlen(ent[i].fake);
if (l1 >= l2 && strncmp(ent[i].fake, pathp, l2) == 0) {
newpath = ent[i].real;
pdiff = strlen(newpath) - l1;
break;
}
}
}
else if (ap_cstr_casecmpn("domain=", token, 7) == 0) {
domainp = token + 7;
doffs = domainp - tmpstr_orig;
l1 = strlen(domainp);
domaine = str + doffs + l1;
if (conf->interpolate_env == 1) {
ent = (struct proxy_alias *)rconf->cookie_domains->elts;
}
else {
ent = (struct proxy_alias *)conf->cookie_domains->elts;
}
for (i = 0; i < conf->cookie_domains->nelts; i++) {
l2 = strlen(ent[i].fake);
if (l1 >= l2 && strncasecmp(ent[i].fake, domainp, l2) == 0) {
newdomain = ent[i].real;
ddiff = strlen(newdomain) - l1;
break;
}
}
}
/* Iterate the remaining tokens using apr_strtok(NULL, ...) */
tmpstr = NULL;
}
if (newpath) {
ret = apr_palloc(r->pool, len + pdiff + ddiff + 1);
l1 = strlen(newpath);
if (newdomain) {
l2 = strlen(newdomain);
if (doffs > poffs) {
memcpy(ret, str, poffs);
memcpy(ret + poffs, newpath, l1);
memcpy(ret + poffs + l1, pathe, str + doffs - pathe);
memcpy(ret + doffs + pdiff, newdomain, l2);
strcpy(ret + doffs + pdiff + l2, domaine);
}
else {
memcpy(ret, str, doffs) ;
memcpy(ret + doffs, newdomain, l2);
memcpy(ret + doffs + l2, domaine, str + poffs - domaine);
memcpy(ret + poffs + ddiff, newpath, l1);
strcpy(ret + poffs + ddiff + l1, pathe);
}
}
else {
memcpy(ret, str, poffs);
memcpy(ret + poffs, newpath, l1);
strcpy(ret + poffs + l1, pathe);
}
}
else if (newdomain) {
ret = apr_palloc(r->pool, len + ddiff + 1);
l2 = strlen(newdomain);
memcpy(ret, str, doffs);
memcpy(ret + doffs, newdomain, l2);
strcpy(ret + doffs + l2, domaine);
}
else {
ret = (char *)str; /* no change */
}
return ret;
}
/*
* BALANCER related...
*/
/*
* verifies that the balancer name conforms to standards.
*/
PROXY_DECLARE(int) ap_proxy_valid_balancer_name(char *name, int i)
{
if (!i)
i = sizeof(BALANCER_PREFIX)-1;
return (!ap_cstr_casecmpn(name, BALANCER_PREFIX, i));
}
PROXY_DECLARE(proxy_balancer *) ap_proxy_get_balancer(apr_pool_t *p,
proxy_server_conf *conf,
const char *url,
int care)
{
proxy_balancer *balancer;
char *c, *uri = apr_pstrdup(p, url);
int i;
proxy_hashes hash;
c = strchr(uri, ':');
if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0') {
return NULL;
}
/* remove path from uri */
if ((c = strchr(c + 3, '/'))) {
*c = '\0';
}
ap_str_tolower(uri);
hash.def = ap_proxy_hashfunc(uri, PROXY_HASHFUNC_DEFAULT);
hash.fnv = ap_proxy_hashfunc(uri, PROXY_HASHFUNC_FNV);
balancer = (proxy_balancer *)conf->balancers->elts;
for (i = 0; i < conf->balancers->nelts; i++) {
if (balancer->hash.def == hash.def && balancer->hash.fnv == hash.fnv) {
if (!care || !balancer->s->inactive) {
return balancer;
}
}
balancer++;
}
return NULL;
}
PROXY_DECLARE(char *) ap_proxy_update_balancer(apr_pool_t *p,
proxy_balancer *balancer,
const char *url)
{
apr_uri_t puri;
if (!url) {
return NULL;
}
if (apr_uri_parse(p, url, &puri) != APR_SUCCESS) {
return apr_psprintf(p, "unable to parse: %s", url);
}
if (puri.path && PROXY_STRNCPY(balancer->s->vpath, puri.path) != APR_SUCCESS) {
return apr_psprintf(p, "balancer %s front-end virtual-path (%s) too long",
balancer->s->name, puri.path);
}
if (puri.hostname && PROXY_STRNCPY(balancer->s->vhost, puri.hostname) != APR_SUCCESS) {
return apr_psprintf(p, "balancer %s front-end vhost name (%s) too long",
balancer->s->name, puri.hostname);
}
return NULL;
}
#define PROXY_UNSET_NONCE '\n'
PROXY_DECLARE(char *) ap_proxy_define_balancer(apr_pool_t *p,
proxy_balancer **balancer,
proxy_server_conf *conf,
const char *url,
const char *alias,
int do_malloc)
{
proxy_balancer_method *lbmethod;
proxy_balancer_shared *bshared;
char *c, *q, *uri = apr_pstrdup(p, url);
const char *sname;
/* We should never get here without a valid BALANCER_PREFIX... */
c = strchr(uri, ':');
if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0')
return apr_psprintf(p, "Bad syntax for a balancer name (%s)", uri);
/* remove path from uri */
if ((q = strchr(c + 3, '/')))
*q = '\0';
ap_str_tolower(uri);
*balancer = apr_array_push(conf->balancers);
memset(*balancer, 0, sizeof(proxy_balancer));
/*
* NOTE: The default method is byrequests - if it doesn't
* exist, that's OK at this time. We check when we share and sync
*/
lbmethod = ap_lookup_provider(PROXY_LBMETHOD, "byrequests", "0");
(*balancer)->lbmethod = lbmethod;
(*balancer)->workers = apr_array_make(p, 5, sizeof(proxy_worker *));
#if APR_HAS_THREADS
(*balancer)->gmutex = NULL;
(*balancer)->tmutex = NULL;
#endif
if (do_malloc)
bshared = ap_malloc(sizeof(proxy_balancer_shared));
else
bshared = apr_palloc(p, sizeof(proxy_balancer_shared));
memset(bshared, 0, sizeof(proxy_balancer_shared));
bshared->was_malloced = (do_malloc != 0);
PROXY_STRNCPY(bshared->lbpname, "byrequests");
if (PROXY_STRNCPY(bshared->name, uri) != APR_SUCCESS) {
if (do_malloc) free(bshared);
return apr_psprintf(p, "balancer name (%s) too long", uri);
}
(*balancer)->lbmethod_set = 1;
/*
* We do the below for verification. The real sname will be
* done post_config
*/
ap_pstr2_alnum(p, bshared->name + sizeof(BALANCER_PREFIX) - 1,
&sname);
sname = apr_pstrcat(p, conf->id, "_", sname, NULL);
if (PROXY_STRNCPY(bshared->sname, sname) != APR_SUCCESS) {
if (do_malloc) free(bshared);
return apr_psprintf(p, "balancer safe-name (%s) too long", sname);
}
bshared->hash.def = ap_proxy_hashfunc(bshared->name, PROXY_HASHFUNC_DEFAULT);
bshared->hash.fnv = ap_proxy_hashfunc(bshared->name, PROXY_HASHFUNC_FNV);
(*balancer)->hash = bshared->hash;
bshared->forcerecovery = 1;
bshared->sticky_separator = '.';
*bshared->nonce = PROXY_UNSET_NONCE; /* impossible valid input */
(*balancer)->s = bshared;
(*balancer)->sconf = conf;
return ap_proxy_update_balancer(p, *balancer, alias);
}
/*
* Create an already defined balancer and free up memory.
*/
PROXY_DECLARE(apr_status_t) ap_proxy_share_balancer(proxy_balancer *balancer,
proxy_balancer_shared *shm,
int i)
{
apr_status_t rv = APR_SUCCESS;
proxy_balancer_method *lbmethod;
char *action = "copying";
if (!shm || !balancer->s)
return APR_EINVAL;
if ((balancer->s->hash.def != shm->hash.def) ||
(balancer->s->hash.fnv != shm->hash.fnv)) {
memcpy(shm, balancer->s, sizeof(proxy_balancer_shared));
if (balancer->s->was_malloced)
free(balancer->s);
} else {
action = "re-using";
}
balancer->s = shm;
balancer->s->index = i;
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(02337)
"%s shm[%d] (0x%pp) for %s", action, i, (void *)shm,
balancer->s->name);
/* the below should always succeed */
lbmethod = ap_lookup_provider(PROXY_LBMETHOD, balancer->s->lbpname, "0");
if (lbmethod) {
balancer->lbmethod = lbmethod;
balancer->lbmethod_set = 1;
} else {
ap_log_error(APLOG_MARK, APLOG_CRIT, 0, ap_server_conf, APLOGNO(02432)
"Cannot find LB Method: %s", balancer->s->lbpname);
return APR_EINVAL;
}
if (*balancer->s->nonce == PROXY_UNSET_NONCE) {
char nonce[APR_UUID_FORMATTED_LENGTH + 1];
apr_uuid_t uuid;
/* Generate a pseudo-UUID from the PRNG to use as a nonce for
* the lifetime of the process. uuid.data is a char array so
* this is an adequate substitute for apr_uuid_get(). */
ap_random_insecure_bytes(uuid.data, sizeof uuid.data);
apr_uuid_format(nonce, &uuid);
rv = PROXY_STRNCPY(balancer->s->nonce, nonce);
}
return rv;
}
PROXY_DECLARE(apr_status_t) ap_proxy_initialize_balancer(proxy_balancer *balancer, server_rec *s, apr_pool_t *p)
{
#if APR_HAS_THREADS
apr_status_t rv = APR_SUCCESS;
#endif
ap_slotmem_provider_t *storage = balancer->storage;
apr_size_t size;
unsigned int num;
if (!storage) {
ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(00918)
"no provider for %s", balancer->s->name);
return APR_EGENERAL;
}
/*
* for each balancer we need to init the global
* mutex and then attach to the shared worker shm
*/
if (!balancer->gmutex) {
ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(00919)
"no mutex %s", balancer->s->name);
return APR_EGENERAL;
}
/* Re-open the mutex for the child. */
rv = apr_global_mutex_child_init(&(balancer->gmutex),
apr_global_mutex_lockfile(balancer->gmutex),
p);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s, APLOGNO(00920)
"Failed to reopen mutex %s in child",
balancer->s->name);
return rv;
}
/* now attach */
storage->attach(&(balancer->wslot), balancer->s->sname, &size, &num, p);
if (!balancer->wslot) {
ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(00921) "slotmem_attach failed");
return APR_EGENERAL;
}
if (balancer->lbmethod && balancer->lbmethod->reset)
balancer->lbmethod->reset(balancer, s);
#if APR_HAS_THREADS
if (balancer->tmutex == NULL) {
rv = apr_thread_mutex_create(&(balancer->tmutex), APR_THREAD_MUTEX_DEFAULT, p);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(00922)
"can not create balancer thread mutex");
return rv;
}
}
#endif
return APR_SUCCESS;
}
static proxy_worker *proxy_balancer_get_best_worker(proxy_balancer *balancer,
request_rec *r,
proxy_is_best_callback_fn_t *is_best,
void *baton)
{
int i = 0;
int cur_lbset = 0;
int max_lbset = 0;
int unusable_workers = 0;
apr_pool_t *tpool = NULL;
apr_array_header_t *spares = NULL;
apr_array_header_t *standbys = NULL;
proxy_worker *worker = NULL;
proxy_worker *best_worker = NULL;
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, APLOGNO(10122)
"proxy: Entering %s for BALANCER (%s)",
balancer->lbmethod->name, balancer->s->name);
apr_pool_create(&tpool, r->pool);
apr_pool_tag(tpool, "proxy_lb_best");
spares = apr_array_make(tpool, 1, sizeof(proxy_worker*));
standbys = apr_array_make(tpool, 1, sizeof(proxy_worker*));
/* Process lbsets in order, only replacing unusable workers in a given lbset
* with available spares from the same lbset. Hot standbys will be used as a
* last resort when all other workers and spares are unavailable.
*/
for (cur_lbset = 0; !best_worker && (cur_lbset <= max_lbset); cur_lbset++) {
unusable_workers = 0;
apr_array_clear(spares);
apr_array_clear(standbys);
for (i = 0; i < balancer->workers->nelts; i++) {
worker = APR_ARRAY_IDX(balancer->workers, i, proxy_worker *);
if (worker->s->lbset > max_lbset) {
max_lbset = worker->s->lbset;
}
if (worker->s->lbset != cur_lbset) {
continue;
}
/* A draining worker that is neither a spare nor a standby should be
* considered unusable to be replaced by spares.
*/
if (PROXY_WORKER_IS_DRAINING(worker)) {
if (!PROXY_WORKER_IS_SPARE(worker) && !PROXY_WORKER_IS_STANDBY(worker)) {
unusable_workers++;
}
continue;
}
/* If the worker is in error state run retry on that worker. It will
* be marked as operational if the retry timeout is elapsed. The
* worker might still be unusable, but we try anyway.
*/
if (!PROXY_WORKER_IS_USABLE(worker)) {
ap_proxy_retry_worker("BALANCER", worker, r->server);
}
if (PROXY_WORKER_IS_SPARE(worker)) {
if (PROXY_WORKER_IS_USABLE(worker)) {
APR_ARRAY_PUSH(spares, proxy_worker *) = worker;
}
}
else if (PROXY_WORKER_IS_STANDBY(worker)) {
if (PROXY_WORKER_IS_USABLE(worker)) {
APR_ARRAY_PUSH(standbys, proxy_worker *) = worker;
}
}
else if (PROXY_WORKER_IS_USABLE(worker)) {
if (is_best(worker, best_worker, baton)) {
best_worker = worker;
}
}
else {
unusable_workers++;
}
}
/* Check if any spares are best. */
for (i = 0; (i < spares->nelts) && (i < unusable_workers); i++) {
worker = APR_ARRAY_IDX(spares, i, proxy_worker *);
if (is_best(worker, best_worker, baton)) {
best_worker = worker;
}
}
/* If no workers are available, use the standbys. */
if (!best_worker) {
for (i = 0; i < standbys->nelts; i++) {
worker = APR_ARRAY_IDX(standbys, i, proxy_worker *);
if (is_best(worker, best_worker, baton)) {
best_worker = worker;
}
}
}
}
apr_pool_destroy(tpool);
if (best_worker) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, APLOGNO(10123)
"proxy: %s selected worker \"%s\" : busy %" APR_SIZE_T_FMT " : lbstatus %d",
balancer->lbmethod->name, best_worker->s->name_ex,
best_worker->s->busy, best_worker->s->lbstatus);
}
return best_worker;
}
PROXY_DECLARE(proxy_worker *) ap_proxy_balancer_get_best_worker(proxy_balancer *balancer,
request_rec *r,
proxy_is_best_callback_fn_t *is_best,
void *baton)
{
return proxy_balancer_get_best_worker(balancer, r, is_best, baton);
}
/*
* CONNECTION related...
*/
static void socket_cleanup(proxy_conn_rec *conn)
{
conn->sock = NULL;
conn->tmp_bb = NULL;
conn->connection = NULL;
conn->ssl_hostname = NULL;
apr_pool_clear(conn->scpool);
}
static void address_cleanup(proxy_conn_rec *conn)
{
conn->address = NULL;
conn->addr = NULL;
conn->hostname = NULL;
conn->port = 0;
conn->uds_path = NULL;
if (conn->uds_pool) {
apr_pool_clear(conn->uds_pool);
}
if (conn->sock) {
socket_cleanup(conn);
}
}
static apr_status_t conn_pool_cleanup(void *theworker)
{
((proxy_worker *)theworker)->cp = NULL;
return APR_SUCCESS;
}
static apr_pool_t *make_conn_subpool(apr_pool_t *p, const char *tag,
server_rec *s)
{
apr_pool_t *sp = NULL;
apr_allocator_t *alloc;
apr_thread_mutex_t *mutex;
apr_status_t rv;
rv = apr_allocator_create(&alloc);
if (rv == APR_SUCCESS) {
rv = apr_thread_mutex_create(&mutex, APR_THREAD_MUTEX_DEFAULT, p);
if (rv == APR_SUCCESS) {
apr_allocator_mutex_set(alloc, mutex);
apr_allocator_max_free_set(alloc, ap_max_mem_free);
rv = apr_pool_create_ex(&sp, p, NULL, alloc);
}
else {
apr_allocator_destroy(alloc);
}
}
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s, APLOGNO(10474)
"failed to create %s pool", tag);
ap_abort_on_oom();
return NULL; /* not reached */
}
apr_allocator_owner_set(alloc, sp);
apr_pool_tag(sp, tag);
return sp;
}
static void init_conn_pool(apr_pool_t *p, proxy_worker *worker, server_rec *s)
{
proxy_conn_pool *cp;
/*
* Alloc from the same pool as worker.
* proxy_conn_pool is permanently attached to the worker.
*/
cp = (proxy_conn_pool *)apr_pcalloc(p, sizeof(proxy_conn_pool));
worker->cp = cp;
/*
* We need a first pool (cp->pool) to maintain the connections attached to
* the worker and a second one (cp->dns_pool) to maintain the DNS addresses
* in use (TTL'ed, refcounted). New connections are created as/on a subpool
* of cp->pool and new addresses as/on a subpool of cp->dns_pool, such that
* both leaks (the subpools can be destroyed when the connections and/or
* addresses are over) and race conditions (the creation/destruction of
* subpools is protected by the parent pool's mutex) can be avoided.
*
* cp->dns_pool is created before cp->pool because when a connection on the
* latter is destroyed it might destroy an address on the former, so when
* the base pools are destroyed (e.g. child exit) we thusly make sure that
* cp->dns_pool and its subpools are still alive when cp->pool gets killed.
*
* Both cp->dns_pool and cp->pool have their own allocator/mutex too since
* acquiring connections and addresses don't need to contend.
*/
cp->dns_pool = make_conn_subpool(p, "proxy_worker_dns", s);
cp->pool = make_conn_subpool(p, "proxy_worker_cp", s);
/* When p is cleaning up the child is exiting, signal that to e.g. avoid
* destroying the subpools explicitely in connection_destructor() when
* they have been destroyed already by the reslist cleanup.
*/
apr_pool_pre_cleanup_register(p, worker, conn_pool_cleanup);
}
PROXY_DECLARE(int) ap_proxy_connection_reusable(proxy_conn_rec *conn)
{
proxy_worker *worker = conn->worker;
return !(conn->close
|| conn->forward
|| worker->s->disablereuse
|| !worker->s->is_address_reusable);
}
static proxy_conn_rec *connection_make(apr_pool_t *p, proxy_worker *worker)
{
proxy_conn_rec *conn;
conn = apr_pcalloc(p, sizeof(proxy_conn_rec));
conn->pool = p;
conn->worker = worker;
/*
* Create another subpool that manages the data for the
* socket and the connection member of the proxy_conn_rec struct as we
* destroy this data more frequently than other data in the proxy_conn_rec
* struct like hostname and addr (at least in the case where we have
* keepalive connections that timed out).
*
* XXX: this is really needed only when worker->s->is_address_reusable,
* otherwise conn->scpool = conn->pool would be fine. For now we
* can't change it since it's (kind of) part of the API.
*/
apr_pool_create(&conn->scpool, p);
apr_pool_tag(conn->scpool, "proxy_conn_scpool");
return conn;
}
static void connection_cleanup(void *theconn)
{
proxy_conn_rec *conn = (proxy_conn_rec *)theconn;
proxy_worker *worker = conn->worker;
/* Sanity check: Did we already return the pooled connection? */
if (conn->inreslist) {
ap_log_perror(APLOG_MARK, APLOG_ERR, 0, conn->pool, APLOGNO(00923)
"Pooled connection 0x%pp for worker %s has been"
" already returned to the connection pool.", conn,
ap_proxy_worker_name(conn->pool, worker));
return;
}
if (conn->r) {
apr_pool_destroy(conn->r->pool);
conn->r = NULL;
}
/* determine if the connection should be cleared, closed or reused */
if (!worker->s->is_address_reusable) {
apr_pool_t *p = conn->pool;
apr_pool_clear(p);
conn = connection_make(p, worker);
}
else if (conn->close
|| conn->forward
|| (conn->connection
&& conn->connection->keepalive == AP_CONN_CLOSE)
|| worker->s->disablereuse) {
socket_cleanup(conn);
conn->close = 0;
}
else if (conn->is_ssl) {
/* Unbind/reset the SSL connection dir config (sslconn->dc) from
* r->per_dir_config, r will likely get destroyed before this proxy
* conn is reused.
*/
ap_proxy_ssl_engine(conn->connection, worker->section_config, 1);
}
if (worker->s->hmax && worker->cp->res) {
conn->inreslist = 1;
apr_reslist_release(worker->cp->res, (void *)conn);
}
else {
worker->cp->conn = conn;
}
}
/* DEPRECATED */
PROXY_DECLARE(apr_status_t) ap_proxy_ssl_connection_cleanup(proxy_conn_rec *conn,
request_rec *r)
{
apr_status_t rv;
/*
* If we have an existing SSL connection it might be possible that the
* server sent some SSL message we have not read so far (e.g. an SSL
* shutdown message if the server closed the keepalive connection while
* the connection was held unused in our pool).
* So ensure that if present (=> APR_NONBLOCK_READ) it is read and
* processed. We don't expect any data to be in the returned brigade.
*/
if (conn->sock && conn->connection) {
rv = ap_get_brigade(conn->connection->input_filters, conn->tmp_bb,
AP_MODE_READBYTES, APR_NONBLOCK_READ,
HUGE_STRING_LEN);
if (!APR_BRIGADE_EMPTY(conn->tmp_bb)) {
apr_off_t len;
rv = apr_brigade_length(conn->tmp_bb, 0, &len);
ap_log_rerror(APLOG_MARK, APLOG_TRACE3, rv, r,
"SSL cleanup brigade contained %"
APR_OFF_T_FMT " bytes of data.", len);
apr_brigade_cleanup(conn->tmp_bb);
}
if ((rv != APR_SUCCESS) && !APR_STATUS_IS_EAGAIN(rv)) {
socket_cleanup(conn);
}
}
return APR_SUCCESS;
}
/* reslist constructor */
static apr_status_t connection_constructor(void **resource, void *params,
apr_pool_t *pool)
{
apr_pool_t *p;
proxy_conn_rec *conn;
proxy_worker *worker = (proxy_worker *)params;
/*
* Create a subpool for each connection
* This keeps the memory consumption constant
* when it's recycled or destroyed.
*/
apr_pool_create(&p, pool);
apr_pool_tag(p, "proxy_conn_pool");
conn = connection_make(p, worker);
conn->inreslist = 1;
*resource = conn;
return APR_SUCCESS;
}
/* reslist destructor */
static apr_status_t connection_destructor(void *resource, void *params,
apr_pool_t *pool)
{
proxy_worker *worker = params;
/* Destroy the pool only if not called from reslist_destroy */
if (worker->cp) {
proxy_conn_rec *conn = resource;
apr_pool_destroy(conn->pool);
}
return APR_SUCCESS;
}
/*
* WORKER related...
*/
PROXY_DECLARE(char *) ap_proxy_worker_name(apr_pool_t *p,
proxy_worker *worker)
{
if (!(*worker->s->uds_path) || !p) {
/* just in case */
return worker->s->name_ex;
}
return apr_pstrcat(p, "unix:", worker->s->uds_path, "|", worker->s->name_ex, NULL);
}
PROXY_DECLARE(int) ap_proxy_worker_can_upgrade(apr_pool_t *p,
const proxy_worker *worker,
const char *upgrade,
const char *dflt)
{
/* Find in worker->s->upgrade list (if any) */
const char *worker_upgrade = worker->s->upgrade;
if (*worker_upgrade) {
return (strcmp(worker_upgrade, "*") == 0
|| ap_cstr_casecmp(worker_upgrade, upgrade) == 0
|| ap_find_token(p, worker_upgrade, upgrade));
}
/* Compare to the provided default (if any) */
return (dflt && ap_cstr_casecmp(dflt, upgrade) == 0);
}
/*
* Taken from ap_strcmp_match() :
* Match = 0, NoMatch = 1, Abort = -1, Inval = -2
* Based loosely on sections of wildmat.c by Rich Salz
* Hmmm... shouldn't this really go component by component?
*
* Adds handling of the "\<any>" => "<any>" unescaping.
*/
static int ap_proxy_strcmp_ematch(const char *str, const char *expected)
{
apr_size_t x, y;
for (x = 0, y = 0; expected[y]; ++y, ++x) {
if (expected[y] == '$' && apr_isdigit(expected[y + 1])) {
do {
y += 2;
} while (expected[y] == '$' && apr_isdigit(expected[y + 1]));
if (!expected[y])
return 0;
while (str[x]) {
int ret;
if ((ret = ap_proxy_strcmp_ematch(&str[x++], &expected[y])) != 1)
return ret;
}
return -1;
}
else if (!str[x]) {
return -1;
}
else if (expected[y] == '\\' && !expected[++y]) {
/* NUL is an invalid char! */
return -2;
}
if (str[x] != expected[y])
return 1;
}
/* We got all the way through the worker path without a difference */
return 0;
}
PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker_ex(apr_pool_t *p,
proxy_balancer *balancer,
proxy_server_conf *conf,
const char *url,
unsigned int mask)
{
proxy_worker *worker;
proxy_worker *max_worker = NULL;
int max_match = 0;
int url_length;
int min_match;
int worker_name_length;
const char *c;
char *url_copy;
int i;
if (!url) {
return NULL;
}
if (!(mask & AP_PROXY_WORKER_NO_UDS)) {
url = ap_proxy_de_socketfy(p, url);
if (!url) {
return NULL;
}
}
c = ap_strchr_c(url, ':');
if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0') {
return NULL;
}
url_length = strlen(url);
url_copy = apr_pstrmemdup(p, url, url_length);
/* Default to lookup for both _PREFIX and _MATCH workers */
if (!(mask & (AP_PROXY_WORKER_IS_PREFIX | AP_PROXY_WORKER_IS_MATCH))) {
mask |= AP_PROXY_WORKER_IS_PREFIX | AP_PROXY_WORKER_IS_MATCH;
}
/*
* We need to find the start of the path and
* therefore we know the length of the scheme://hostname/
* part to we can force-lowercase everything up to
* the start of the path.
*/
c = ap_strchr_c(c+3, '/');
if (c) {
char *pathstart;
pathstart = url_copy + (c - url);
*pathstart = '\0';
ap_str_tolower(url_copy);
min_match = strlen(url_copy);
*pathstart = '/';
}
else {
ap_str_tolower(url_copy);
min_match = strlen(url_copy);
}
/*
* Do a "longest match" on the worker name to find the worker that
* fits best to the URL, but keep in mind that we must have at least
* a minimum matching of length min_match such that
* scheme://hostname[:port] matches between worker and url.
*/
if (balancer) {
proxy_worker **workers = (proxy_worker **)balancer->workers->elts;
for (i = 0; i < balancer->workers->nelts; i++, workers++) {
worker = *workers;
if ( ((worker_name_length = strlen(worker->s->name_ex)) <= url_length)
&& (worker_name_length >= min_match)
&& (worker_name_length > max_match)
&& (worker->s->is_name_matchable
|| ((mask & AP_PROXY_WORKER_IS_PREFIX)
&& strncmp(url_copy, worker->s->name_ex,
worker_name_length) == 0))
&& (!worker->s->is_name_matchable
|| ((mask & AP_PROXY_WORKER_IS_MATCH)
&& ap_proxy_strcmp_ematch(url_copy,
worker->s->name_ex) == 0)) ) {
max_worker = worker;
max_match = worker_name_length;
}
}
} else {
worker = (proxy_worker *)conf->workers->elts;
for (i = 0; i < conf->workers->nelts; i++, worker++) {
if ( ((worker_name_length = strlen(worker->s->name_ex)) <= url_length)
&& (worker_name_length >= min_match)
&& (worker_name_length > max_match)
&& (worker->s->is_name_matchable
|| ((mask & AP_PROXY_WORKER_IS_PREFIX)
&& strncmp(url_copy, worker->s->name_ex,
worker_name_length) == 0))
&& (!worker->s->is_name_matchable
|| ((mask & AP_PROXY_WORKER_IS_MATCH)
&& ap_proxy_strcmp_ematch(url_copy,
worker->s->name_ex) == 0)) ) {
max_worker = worker;
max_match = worker_name_length;
}
}
}
return max_worker;
}
PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker(apr_pool_t *p,
proxy_balancer *balancer,
proxy_server_conf *conf,
const char *url)
{
return ap_proxy_get_worker_ex(p, balancer, conf, url, 0);
}
/*
* To create a worker from scratch first we define the
* specifics of the worker; this is all local data.
* We then allocate space for it if data needs to be
* shared. This allows for dynamic addition during
* config and runtime.
*/
PROXY_DECLARE(char *) ap_proxy_define_worker_ex(apr_pool_t *p,
proxy_worker **worker,
proxy_balancer *balancer,
proxy_server_conf *conf,
const char *url,
unsigned int mask)
{
apr_status_t rv;
proxy_worker_shared *wshared;
const char *ptr = NULL, *sockpath = NULL, *pdollars = NULL;
apr_port_t port_of_scheme;
int address_not_reusable = 0;
apr_uri_t uri;
/*
* Look to see if we are using UDS:
* require format: unix:/path/foo/bar.sock|http://ignored/path2/
* This results in talking http to the socket at /path/foo/bar.sock
*/
if (!ap_cstr_casecmpn(url, "unix:", 5)
&& (ptr = ap_strchr_c(url + 5, '|'))) {
rv = apr_uri_parse(p, apr_pstrmemdup(p, url, ptr - url), &uri);
if (rv == APR_SUCCESS) {
sockpath = ap_runtime_dir_relative(p, uri.path);;
ptr++; /* so we get the scheme for the uds */
}
else {
ptr = url;
}
}
else {
ptr = url;
}
if (mask & AP_PROXY_WORKER_IS_MATCH) {
/* apr_uri_parse() will accept the '$' sign anywhere in the URL but
* in the :port part, and we don't want scheme://host:port$1$2/path
* to fail (e.g. "ProxyPassMatch ^/(a|b)(/.*)? http://host:port$2").
* So we trim all the $n from the :port and prepend them in uri.path
* afterward for apr_uri_unparse() to restore the original URL below.
* If a dollar substitution is found in the hostname[:port] part of
* the URL, reusing address and connections in the same worker is not
* possible (the current implementation of active connections cache
* handles/assumes a single origin server:port per worker only), so
* we set address_not_reusable here during parsing to take that into
* account in the worker settings below.
*/
#define IS_REF(x) (x[0] == '$' && apr_isdigit(x[1]))
const char *pos = ap_strstr_c(ptr, "://");
if (pos) {
pos += 3;
while (*pos && *pos != ':' && *pos != '/') {
if (*pos == '$') {
address_not_reusable = 1;
}
pos++;
}
if (*pos == ':') {
pos++;
while (*pos && !IS_REF(pos) && *pos != '/') {
pos++;
}
if (IS_REF(pos)) {
struct iovec vec[2];
const char *path = pos + 2;
while (*path && *path != '/') {
path++;
}
pdollars = apr_pstrmemdup(p, pos, path - pos);
vec[0].iov_base = (void *)ptr;
vec[0].iov_len = pos - ptr;
vec[1].iov_base = (void *)path;
vec[1].iov_len = strlen(path);
ptr = apr_pstrcatv(p, vec, 2, NULL);
address_not_reusable = 1;
}
}
}
#undef IS_REF
}
/* Normalize the url (worker name) */
rv = apr_uri_parse(p, ptr, &uri);
if (rv != APR_SUCCESS) {
return apr_pstrcat(p, "Unable to parse URL: ", url, NULL);
}
if (!uri.scheme) {
return apr_pstrcat(p, "URL must be absolute!: ", url, NULL);
}
if (!uri.hostname) {
if (sockpath) {
/* allow for unix:/path|http: */
uri.hostname = "localhost";
}
else {
return apr_pstrcat(p, "URL must be absolute!: ", url, NULL);
}
}
else {
ap_str_tolower(uri.hostname);
}
ap_str_tolower(uri.scheme);
port_of_scheme = ap_proxy_port_of_scheme(uri.scheme);
if (uri.port && uri.port == port_of_scheme) {
uri.port = 0;
}
if (pdollars) {
/* Restore/prepend pdollars into the path. */
uri.path = apr_pstrcat(p, pdollars, uri.path, NULL);
}
ptr = apr_uri_unparse(p, &uri, APR_URI_UNP_REVEALPASSWORD);
/*
* Workers can be associated w/ balancers or on their
* own; ie: the generic reverse-proxy or a worker
* in a simple ProxyPass statement. eg:
*
* ProxyPass / http://www.example.com
*
* in which case the worker goes in the conf slot.
*/
if (balancer) {
proxy_worker **runtime;
/* recall that we get a ptr to the ptr here */
runtime = apr_array_push(balancer->workers);
*worker = *runtime = apr_palloc(p, sizeof(proxy_worker)); /* right to left baby */
/* we've updated the list of workers associated with
* this balancer *locally* */
balancer->wupdated = apr_time_now();
} else if (conf) {
*worker = apr_array_push(conf->workers);
} else {
/* we need to allocate space here */
*worker = apr_palloc(p, sizeof(proxy_worker));
}
memset(*worker, 0, sizeof(proxy_worker));
/* right here we just want to tuck away the worker info.
* if called during config, we don't have shm setup yet,
* so just note the info for later. */
if (mask & AP_PROXY_WORKER_IS_MALLOCED)
wshared = ap_malloc(sizeof(proxy_worker_shared)); /* will be freed ap_proxy_share_worker */
else
wshared = apr_palloc(p, sizeof(proxy_worker_shared));
memset(wshared, 0, sizeof(proxy_worker_shared));
if (PROXY_STRNCPY(wshared->name_ex, ptr) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(10366)
"Alert! worker name (%s) too long; truncated to: %s", ptr, wshared->name_ex);
}
if (PROXY_STRNCPY(wshared->name, ptr) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(010118)
"worker name (%s) too long; truncated for legacy modules that do not use "
"proxy_worker_shared->name_ex: %s", ptr, wshared->name);
}
if (PROXY_STRNCPY(wshared->scheme, uri.scheme) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(010117)
"Alert! worker scheme (%s) too long; truncated to: %s", uri.scheme, wshared->scheme);
}
if (PROXY_STRNCPY(wshared->hostname_ex, uri.hostname) != APR_SUCCESS) {
return apr_psprintf(p, "worker hostname (%s) too long", uri.hostname);
}
if (PROXY_STRNCPY(wshared->hostname, uri.hostname) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(010118)
"worker hostname (%s) too long; truncated for legacy modules that do not use "
"proxy_worker_shared->hostname_ex: %s", uri.hostname, wshared->hostname);
}
wshared->port = (uri.port) ? uri.port : port_of_scheme;
wshared->flush_packets = flush_off;
wshared->flush_wait = PROXY_FLUSH_WAIT;
wshared->address_ttl = (address_not_reusable) ? 0 : -1;
wshared->is_address_reusable = (address_not_reusable == 0);
wshared->disablereuse = (address_not_reusable != 0);
wshared->lbfactor = 100;
wshared->passes = 1;
wshared->fails = 1;
wshared->interval = apr_time_from_sec(HCHECK_WATHCHDOG_DEFAULT_INTERVAL);
wshared->smax = -1;
wshared->hash.def = ap_proxy_hashfunc(wshared->name_ex, PROXY_HASHFUNC_DEFAULT);
wshared->hash.fnv = ap_proxy_hashfunc(wshared->name_ex, PROXY_HASHFUNC_FNV);
wshared->was_malloced = (mask & AP_PROXY_WORKER_IS_MALLOCED) != 0;
if (mask & AP_PROXY_WORKER_IS_MATCH) {
wshared->is_name_matchable = 1;
/* Before AP_PROXY_WORKER_IS_MATCH (< 2.4.47), a regex worker with
* dollar substitution was never matched against any actual URL, thus
* the requests fell through the generic worker. Now if a ProyPassMatch
* matches, a worker (and its parameters) is always used to determine
* the properties of the connection with the origin server. So for
* instance the same "timeout=" will be enforced for all the requests
* matched by the same ProyPassMatch worker, which is an improvement
* compared to the global/vhost [Proxy]Timeout applied by the generic
* worker. Likewise, address and connection reuse is the default for
* a ProyPassMatch worker with no dollar substitution, just like a
* "normal" worker. However to avoid DNS and connection reuse compat
* issues, connection reuse is disabled by default if there is any
* substitution in the uri-path (an explicit enablereuse=on can still
* opt-in), and reuse is even disabled definitively for substitutions
* happening in the hostname[:port] (is_address_reusable was unset
* above so it will prevent enablereuse=on to apply anyway).
*/
if (ap_strchr_c(wshared->name, '$')) {
wshared->disablereuse = 1;
}
}
if (sockpath) {
if (PROXY_STRNCPY(wshared->uds_path, sockpath) != APR_SUCCESS) {
return apr_psprintf(p, "worker uds path (%s) too long", sockpath);
}
}
else {
*wshared->uds_path = '\0';
}
if (!balancer) {
wshared->status |= PROXY_WORKER_IGNORE_ERRORS;
}
(*worker)->hash = wshared->hash;
(*worker)->context = NULL;
(*worker)->cp = NULL;
(*worker)->balancer = balancer;
(*worker)->s = wshared;
return NULL;
}
PROXY_DECLARE(char *) ap_proxy_define_worker(apr_pool_t *p,
proxy_worker **worker,
proxy_balancer *balancer,
proxy_server_conf *conf,
const char *url,
int do_malloc)
{
return ap_proxy_define_worker_ex(p, worker, balancer, conf, url,
AP_PROXY_WORKER_IS_PREFIX |
(do_malloc ? AP_PROXY_WORKER_IS_MALLOCED
: 0));
}
/* DEPRECATED */
PROXY_DECLARE(char *) ap_proxy_define_match_worker(apr_pool_t *p,
proxy_worker **worker,
proxy_balancer *balancer,
proxy_server_conf *conf,
const char *url,
int do_malloc)
{
return ap_proxy_define_worker_ex(p, worker, balancer, conf, url,
AP_PROXY_WORKER_IS_MATCH |
(do_malloc ? AP_PROXY_WORKER_IS_MALLOCED
: 0));
}
/*
* Create an already defined worker and free up memory
*/
PROXY_DECLARE(apr_status_t) ap_proxy_share_worker(proxy_worker *worker, proxy_worker_shared *shm,
int i)
{
char *action = "copying";
if (!shm || !worker->s)
return APR_EINVAL;
if ((worker->s->hash.def != shm->hash.def) ||
(worker->s->hash.fnv != shm->hash.fnv)) {
memcpy(shm, worker->s, sizeof(proxy_worker_shared));
if (worker->s->was_malloced)
free(worker->s); /* was malloced in ap_proxy_define_worker */
} else {
action = "re-using";
}
worker->s = shm;
worker->s->index = i;
if (APLOGdebug(ap_server_conf)) {
apr_pool_t *pool;
apr_pool_create(&pool, ap_server_conf->process->pool);
apr_pool_tag(pool, "proxy_worker_name");
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(02338)
"%s shm[%d] (0x%pp) for worker: %s", action, i, (void *)shm,
ap_proxy_worker_name(pool, worker));
if (pool) {
apr_pool_destroy(pool);
}
}
return APR_SUCCESS;
}
PROXY_DECLARE(apr_status_t) ap_proxy_initialize_worker(proxy_worker *worker, server_rec *s, apr_pool_t *p)
{
APR_OPTIONAL_FN_TYPE(http2_get_num_workers) *get_h2_num_workers;
apr_status_t rv = APR_SUCCESS;
int max_threads, minw, maxw;
if (worker->s->status & PROXY_WORKER_INITIALIZED) {
/* The worker is already initialized */
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00924)
"worker %s shared already initialized",
ap_proxy_worker_name(p, worker));
}
else {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00925)
"initializing worker %s shared",
ap_proxy_worker_name(p, worker));
/* Set default parameters */
if (!worker->s->retry_set) {
worker->s->retry = apr_time_from_sec(PROXY_WORKER_DEFAULT_RETRY);
}
/* Consistently set address and connection reusabilty: when reuse
* is disabled by configuration, or when the address is known already
* to not be reusable for this worker (in any case, thus ignore/force
* DisableReuse).
*/
if (!worker->s->address_ttl || (!worker->s->address_ttl_set
&& worker->s->disablereuse)) {
worker->s->is_address_reusable = 0;
}
if (!worker->s->is_address_reusable && !worker->s->disablereuse) {
/* Explicit enablereuse=on can't work in this case, warn user. */
if (worker->s->disablereuse_set) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(10400)
"enablereuse/disablereuse ignored for worker %s",
ap_proxy_worker_name(p, worker));
}
worker->s->disablereuse = 1;
}
/*
* When mod_http2 is loaded we might have more threads since it has
* its own pool of processing threads.
*/
ap_mpm_query(AP_MPMQ_MAX_THREADS, &max_threads);
get_h2_num_workers = APR_RETRIEVE_OPTIONAL_FN(http2_get_num_workers);
if (get_h2_num_workers) {
get_h2_num_workers(s, &minw, &maxw);
/* So now the max is:
* max_threads-1 threads for HTTP/1 each requiring one connection
* + one thread for HTTP/2 requiring maxw connections
*/
max_threads = max_threads - 1 + maxw;
}
if (max_threads > 1) {
/* Default hmax is max_threads to scale with the load and never
* wait for an idle connection to proceed.
*/
if (worker->s->hmax == 0) {
worker->s->hmax = max_threads;
}
if (worker->s->smax == -1 || worker->s->smax > worker->s->hmax) {
worker->s->smax = worker->s->hmax;
}
/* Set min to be lower than smax */
if (worker->s->min > worker->s->smax) {
worker->s->min = worker->s->smax;
}
}
else {
/* This will suppress the apr_reslist creation */
worker->s->min = worker->s->smax = worker->s->hmax = 0;
}
}
/* What if local is init'ed and shm isn't?? Even possible? */
if (worker->local_status & PROXY_WORKER_INITIALIZED) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00926)
"worker %s local already initialized",
ap_proxy_worker_name(p, worker));
}
else {
apr_global_mutex_lock(proxy_mutex);
/* Check again after we got the lock if we are still uninitialized */
if (!(AP_VOLATILIZE_T(unsigned int, worker->local_status) & PROXY_WORKER_INITIALIZED)) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00927)
"initializing worker %s local",
ap_proxy_worker_name(p, worker));
/* Now init local worker data */
#if APR_HAS_THREADS
if (worker->tmutex == NULL) {
rv = apr_thread_mutex_create(&(worker->tmutex), APR_THREAD_MUTEX_DEFAULT, p);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00928)
"can not create worker thread mutex");
apr_global_mutex_unlock(proxy_mutex);
return rv;
}
}
#endif
if (worker->cp == NULL)
init_conn_pool(p, worker, s);
if (worker->cp == NULL) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00929)
"can not create connection pool");
apr_global_mutex_unlock(proxy_mutex);
return APR_EGENERAL;
}
if (worker->s->hmax) {
rv = apr_reslist_create(&(worker->cp->res),
worker->s->min, worker->s->smax,
worker->s->hmax, worker->s->ttl,
connection_constructor, connection_destructor,
worker, worker->cp->pool);
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00930)
"initialized pool in child %" APR_PID_T_FMT " for (%s:%d) min=%d max=%d smax=%d",
getpid(), worker->s->hostname_ex, (int)worker->s->port,
worker->s->min, worker->s->hmax, worker->s->smax);
/* Set the acquire timeout */
if (rv == APR_SUCCESS && worker->s->acquire_set) {
apr_reslist_timeout_set(worker->cp->res, worker->s->acquire);
}
}
else {
void *conn;
rv = connection_constructor(&conn, worker, worker->cp->pool);
worker->cp->conn = conn;
ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, s, APLOGNO(00931)
"initialized single connection worker in child %" APR_PID_T_FMT " for (%s:%d)",
getpid(), worker->s->hostname_ex,
(int)worker->s->port);
}
if (rv == APR_SUCCESS) {
worker->local_status |= (PROXY_WORKER_INITIALIZED);
}
}
apr_global_mutex_unlock(proxy_mutex);
}
if (rv == APR_SUCCESS) {
worker->s->status |= (PROXY_WORKER_INITIALIZED);
}
return rv;
}
static int ap_proxy_retry_worker(const char *proxy_function, proxy_worker *worker,
server_rec *s)
{
if (worker->s->status & PROXY_WORKER_IN_ERROR) {
if (PROXY_WORKER_IS(worker, PROXY_WORKER_STOPPED)) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(3305)
"%s: Won't retry worker (%s:%d): stopped",
proxy_function, worker->s->hostname_ex,
(int)worker->s->port);
return DECLINED;
}
if ((worker->s->status & PROXY_WORKER_IGNORE_ERRORS)
|| apr_time_now() > worker->s->error_time + worker->s->retry) {
++worker->s->retries;
worker->s->status &= ~PROXY_WORKER_IN_ERROR;
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00932)
"%s: worker for (%s:%d) has been marked for retry",
proxy_function, worker->s->hostname_ex,
(int)worker->s->port);
return OK;
}
else {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00933)
"%s: too soon to retry worker for (%s:%d)",
proxy_function, worker->s->hostname_ex,
(int)worker->s->port);
return DECLINED;
}
}
else {
return OK;
}
}
/*
* In the case of the reverse proxy, we need to see if we
* were passed a UDS url (eg: from mod_proxy) and adjust uds_path
* as required.
*/
static int fix_uds_filename(request_rec *r, char **url)
{
char *uds_url = r->filename + 6, *origin_url;
if (!strncmp(r->filename, "proxy:", 6) &&
!ap_cstr_casecmpn(uds_url, "unix:", 5) &&
(origin_url = ap_strchr(uds_url + 5, '|'))) {
char *uds_path = NULL;
apr_size_t url_len;
apr_uri_t urisock;
apr_status_t rv;
*origin_url = '\0';
rv = apr_uri_parse(r->pool, uds_url, &urisock);
*origin_url++ = '|';
if (rv == APR_SUCCESS && urisock.path && (!urisock.hostname
|| !urisock.hostname[0])) {
uds_path = ap_runtime_dir_relative(r->pool, urisock.path);
}
if (!uds_path) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10292)
"Invalid proxy UDS filename (%s)", r->filename);
return 0;
}
apr_table_setn(r->notes, "uds_path", uds_path);
/* Remove the UDS path from *url and r->filename */
url_len = strlen(origin_url);
*url = apr_pstrmemdup(r->pool, origin_url, url_len);
memcpy(uds_url, *url, url_len + 1);
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
"*: rewrite of url due to UDS(%s): %s (%s)",
uds_path, *url, r->filename);
}
return 1;
}
PROXY_DECLARE(int) ap_proxy_pre_request(proxy_worker **worker,
proxy_balancer **balancer,
request_rec *r,
proxy_server_conf *conf, char **url)
{
int access_status;
access_status = proxy_run_pre_request(worker, balancer, r, conf, url);
if (access_status == DECLINED && *balancer == NULL) {
const int forward = (r->proxyreq == PROXYREQ_PROXY);
*worker = ap_proxy_get_worker_ex(r->pool, NULL, conf, *url,
forward ? AP_PROXY_WORKER_NO_UDS : 0);
if (*worker) {
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
"%s: found worker %s for %s",
(*worker)->s->scheme, (*worker)->s->name_ex, *url);
if (!forward && !fix_uds_filename(r, url)) {
return HTTP_INTERNAL_SERVER_ERROR;
}
access_status = OK;
}
else if (forward) {
if (conf->forward) {
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
"*: found forward proxy worker for %s", *url);
*worker = conf->forward;
access_status = OK;
/*
* The forward worker does not keep connections alive, so
* ensure that mod_proxy_http does the correct thing
* regarding the Connection header in the request.
*/
apr_table_setn(r->subprocess_env, "proxy-nokeepalive", "1");
}
}
else if (r->proxyreq == PROXYREQ_REVERSE) {
if (conf->reverse) {
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
"*: using default reverse proxy worker for %s "
"(no keepalive)", *url);
*worker = conf->reverse;
access_status = OK;
/*
* The reverse worker does not keep connections alive, so
* ensure that mod_proxy_http does the correct thing
* regarding the Connection header in the request.
*/
apr_table_setn(r->subprocess_env, "proxy-nokeepalive", "1");
if (!fix_uds_filename(r, url)) {
return HTTP_INTERNAL_SERVER_ERROR;
}
}
}
}
else if (access_status == DECLINED && *balancer != NULL) {
/* All the workers are busy */
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00934)
"all workers are busy. Unable to serve %s", *url);
access_status = HTTP_SERVICE_UNAVAILABLE;
}
return access_status;
}
PROXY_DECLARE(int) ap_proxy_post_request(proxy_worker *worker,
proxy_balancer *balancer,
request_rec *r,
proxy_server_conf *conf)
{
int access_status = OK;
if (balancer) {
access_status = proxy_run_post_request(worker, balancer, r, conf);
if (access_status == DECLINED) {
access_status = OK; /* no post_request handler available */
/* TODO: recycle direct worker */
}
}
return access_status;
}
/* DEPRECATED */
PROXY_DECLARE(int) ap_proxy_connect_to_backend(apr_socket_t **newsock,
const char *proxy_function,
apr_sockaddr_t *backend_addr,
const char *backend_name,
proxy_server_conf *conf,
request_rec *r)
{
apr_status_t rv;
int connected = 0;
int loglevel;
while (backend_addr && !connected) {
if ((rv = apr_socket_create(newsock, backend_addr->family,
SOCK_STREAM, 0, r->pool)) != APR_SUCCESS) {
loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
ap_log_rerror(APLOG_MARK, loglevel, rv, r, APLOGNO(00935)
"%s: error creating fam %d socket for target %s",
proxy_function, backend_addr->family, backend_name);
/*
* this could be an IPv6 address from the DNS but the
* local machine won't give us an IPv6 socket; hopefully the
* DNS returned an additional address to try
*/
backend_addr = backend_addr->next;
continue;
}
if (conf->recv_buffer_size > 0 &&
(rv = apr_socket_opt_set(*newsock, APR_SO_RCVBUF,
conf->recv_buffer_size))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00936)
"apr_socket_opt_set(SO_RCVBUF): Failed to set "
"ProxyReceiveBufferSize, using default");
}
rv = apr_socket_opt_set(*newsock, APR_TCP_NODELAY, 1);
if (rv != APR_SUCCESS && rv != APR_ENOTIMPL) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00937)
"apr_socket_opt_set(APR_TCP_NODELAY): "
"Failed to set");
}
/* Set a timeout on the socket */
if (conf->timeout_set) {
apr_socket_timeout_set(*newsock, conf->timeout);
}
else {
apr_socket_timeout_set(*newsock, r->server->timeout);
}
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
"%s: fam %d socket created to connect to %s",
proxy_function, backend_addr->family, backend_name);
if (conf->source_address) {
apr_sockaddr_t *local_addr;
/* Make a copy since apr_socket_bind() could change
* conf->source_address, which we don't want.
*/
local_addr = apr_pmemdup(r->pool, conf->source_address,
sizeof(apr_sockaddr_t));
local_addr->pool = r->pool;
rv = apr_socket_bind(*newsock, local_addr);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00938)
"%s: failed to bind socket to local address",
proxy_function);
}
}
/* make the connection out of the socket */
rv = apr_socket_connect(*newsock, backend_addr);
/* if an error occurred, loop round and try again */
if (rv != APR_SUCCESS) {
apr_socket_close(*newsock);
loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
ap_log_rerror(APLOG_MARK, loglevel, rv, r, APLOGNO(00939)
"%s: attempt to connect to %pI (%s) failed",
proxy_function, backend_addr, backend_name);
backend_addr = backend_addr->next;
continue;
}
connected = 1;
}
return connected ? 0 : 1;
}
PROXY_DECLARE(int) ap_proxy_acquire_connection(const char *proxy_function,
proxy_conn_rec **conn,
proxy_worker *worker,
server_rec *s)
{
apr_status_t rv;
if (!PROXY_WORKER_IS_USABLE(worker)) {
/* Retry the worker */
ap_proxy_retry_worker(proxy_function, worker, s);
if (!PROXY_WORKER_IS_USABLE(worker)) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00940)
"%s: disabled connection for (%s:%d)",
proxy_function, worker->s->hostname_ex,
(int)worker->s->port);
return HTTP_SERVICE_UNAVAILABLE;
}
}
if (worker->s->hmax && worker->cp->res) {
rv = apr_reslist_acquire(worker->cp->res, (void **)conn);
}
else {
/* create the new connection if the previous was destroyed */
if (!worker->cp->conn) {
rv = connection_constructor((void **)conn, worker, worker->cp->pool);
}
else {
*conn = worker->cp->conn;
worker->cp->conn = NULL;
rv = APR_SUCCESS;
}
}
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00941)
"%s: failed to acquire connection for (%s:%d)",
proxy_function, worker->s->hostname_ex,
(int)worker->s->port);
return HTTP_SERVICE_UNAVAILABLE;
}
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00942)
"%s: has acquired connection for (%s:%d)",
proxy_function, worker->s->hostname_ex,
(int)worker->s->port);
(*conn)->worker = worker;
(*conn)->close = 0;
(*conn)->inreslist = 0;
return OK;
}
PROXY_DECLARE(int) ap_proxy_release_connection(const char *proxy_function,
proxy_conn_rec *conn,
server_rec *s)
{
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00943)
"%s: has released connection for (%s:%d)",
proxy_function, conn->worker->s->hostname_ex,
(int)conn->worker->s->port);
connection_cleanup(conn);
return OK;
}
static APR_INLINE void proxy_address_inc(proxy_address *address)
{
apr_uint32_t old = apr_atomic_inc32(&address->refcount);
ap_assert(old > 0 && old < APR_UINT32_MAX);
}
static APR_INLINE void proxy_address_dec(proxy_address *address)
{
/* Use _add32(, -1) since _dec32()'s returned value does not help */
apr_uint32_t old = apr_atomic_add32(&address->refcount, -1);
ap_assert(old > 0);
if (old == 1) {
apr_pool_destroy(address->addr->pool);
}
}
static apr_status_t proxy_address_cleanup(void *address)
{
proxy_address_dec(address);
return APR_SUCCESS;
}
static APR_INLINE proxy_address *worker_address_get(proxy_worker *worker)
{
/* No _readptr() so let's _casptr(, NULL, NULL) instead */
return apr_atomic_casptr((void *)&worker->address, NULL, NULL);
}
/* XXX: Call when PROXY_THREAD_LOCK()ed only! */
static APR_INLINE void worker_address_set(proxy_worker *worker,
proxy_address *to)
{
proxy_address *old = apr_atomic_xchgptr((void *)&worker->address, to);
if (old && old != to) {
proxy_address_dec(old);
}
}
static apr_status_t worker_address_resolve(proxy_worker *worker,
apr_sockaddr_t **paddr,
const char *hostname,
apr_port_t hostport,
const char *proxy_function,
request_rec *r, server_rec *s)
{
apr_status_t rv;
apr_pool_t *pool = NULL;
apr_pool_create(&pool, worker->cp->dns_pool);
rv = apr_sockaddr_info_get(paddr, hostname, APR_UNSPEC,
hostport, 0, pool);
if (rv != APR_SUCCESS) {
if (r && !s) {
proxyerror_core(r, HTTP_INTERNAL_SERVER_ERROR,
apr_pstrcat(pool,
"DNS lookup failure for: ",
hostname, NULL),
rv);
}
else if (r) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rv, r, APLOGNO(10477)
"%s: resolving worker %s address",
proxy_function, hostname);
}
else {
ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, s, APLOGNO(10478)
"%s: resolving worker %s address",
proxy_function, hostname);
}
apr_pool_destroy(pool);
return rv;
}
if (r ? APLOGrdebug(r) : APLOGdebug(s)) {
char *addrs = NULL;
apr_sockaddr_t *addr = *paddr;
for (; addr; addr = addr->next) {
addrs = apr_psprintf(pool, "%s%s%pI",
addrs ? ", " : "",
addrs ? addrs : "",
addr);
}
if (r) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(10479)
"%s: %s resolved to %s",
proxy_function, hostname, addrs);
}
else {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(10480)
"%s: %s resolved to %s",
proxy_function, hostname, addrs);
}
}
return APR_SUCCESS;
}
static int proxy_addrs_equal(const apr_sockaddr_t *addr1,
const apr_sockaddr_t *addr2)
{
const apr_sockaddr_t *base2 = addr2, *pos2;
while (addr1 && addr2) {
for (pos2 = base2; pos2; pos2 = pos2->next) {
if (apr_sockaddr_equal(pos2, addr1)) {
break;
}
}
if (!pos2) {
return 0;
}
addr1 = addr1->next;
addr2 = addr2->next;
}
if (addr1 || addr2) {
return 0;
}
return 1;
}
PROXY_DECLARE(apr_status_t) ap_proxy_determine_address(const char *proxy_function,
proxy_conn_rec *conn,
const char *hostname,
apr_port_t hostport,
unsigned int flags,
request_rec *r,
server_rec *s)
{
proxy_worker *worker = conn->worker;
apr_status_t rv;
/*
* Worker can have the single constant backend adress.
* The single DNS lookup is used once per worker.
* If dynamic change is needed then set the addr to NULL
* inside dynamic config to force the lookup.
* The worker's addressTTL parameter may also be configured
* to perform the DNS lookups only when the TTL expires,
* or each time if that TTL is zero.
*/
if (!worker->s->is_address_reusable) {
conn->hostname = apr_pstrdup(conn->pool, hostname);
conn->port = hostport;
rv = apr_sockaddr_info_get(&conn->addr, hostname, APR_UNSPEC,
hostport, 0, conn->pool);
if (rv != APR_SUCCESS) {
if (r && !s) {
proxyerror_core(r, HTTP_INTERNAL_SERVER_ERROR,
apr_pstrcat(r->pool, "DNS lookup failure for: ",
hostname, NULL), rv);
}
else if (r) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rv, r, APLOGNO(10475)
"%s: resolving backend %s address",
proxy_function, hostname);
}
else {
ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, s, APLOGNO(10476)
"%s: resolving backend %s address",
proxy_function, hostname);
}
return rv;
}
}
else {
apr_sockaddr_t *addr = NULL;
proxy_address *address = NULL;
apr_int32_t ttl = worker->s->address_ttl;
apr_uint32_t now = 0;
if (flags & PROXY_DETERMINE_ADDRESS_CHECK) {
/* The caller wants to check if the address changed, return
* APR_EEXIST if not, otherwise fall through to update the
* worker's for everyone to switch.
*/
if (!conn->addr) {
/* Need something to compare with */
return APR_EINVAL;
}
rv = worker_address_resolve(worker, &addr,
hostname, hostport,
proxy_function, r, s);
if (rv != APR_SUCCESS) {
return rv;
}
if (proxy_addrs_equal(conn->addr, addr)) {
apr_pool_destroy(addr->pool);
return APR_EEXIST;
}
}
AP_DEBUG_ASSERT(ttl != 0);
if (ttl > 0) {
/* TODO: use a monotonic clock here */
now = apr_time_sec(apr_time_now() - *proxy_start_time);
}
/* Addresses are refcounted, destroyed when their refcount reaches 0.
*
* One ref is taken by worker->address as the worker's current/latest
* address, it's dropped when that address expires/changes (see below).
* The other refs are taken by the connections when using/switching to
* the current worker address (also below), they are dropped when the
* conns are destroyed (by the reslist though it should never happen
* if hmax is greater than the number of threads) OR for an expired
* conn->address when it's replaced by the new worker->address below.
*
* Dereferencing worker->address requires holding the worker mutex or
* some concurrent connection processing might change/destroy it at any
* time. So only conn->address is safe to dereference anywhere (unless
* NULL..) since it has at least the lifetime of the connection.
*/
if (!addr) {
address = worker_address_get(worker);
}
if (!address
|| conn->address != address
|| apr_atomic_read32(&address->expiry) <= now) {
PROXY_THREAD_LOCK(worker);
/* Re-check while locked, might be a new address already */
if (!addr) {
address = worker_address_get(worker);
}
if (!address || apr_atomic_read32(&address->expiry) <= now) {
if (!addr) {
rv = worker_address_resolve(worker, &addr,
hostname, hostport,
proxy_function, r, s);
if (rv != APR_SUCCESS) {
PROXY_THREAD_UNLOCK(worker);
return rv;
}
/* Recompute "now" should the DNS be slow
* TODO: use a monotonic clock here
*/
now = apr_time_sec(apr_time_now() - *proxy_start_time);
}
address = apr_pcalloc(addr->pool, sizeof(*address));
address->hostname = apr_pstrdup(addr->pool, hostname);
address->hostport = hostport;
address->addr = addr;
if (ttl > 0) {
/* We keep each worker's expiry date shared accross all the
* children so that they update their address at the same
* time, regardless of whether a specific child forced an
* address to expire at some point (for connect() issues).
*/
address->expiry = apr_atomic_read32(&worker->s->address_expiry);
if (address->expiry <= now) {
apr_uint32_t new_expiry = address->expiry + ttl;
while (new_expiry <= now) {
new_expiry += ttl;
}
new_expiry = apr_atomic_cas32(&worker->s->address_expiry,
new_expiry, address->expiry);
/* race lost? well the expiry should grow anyway.. */
AP_DEBUG_ASSERT(new_expiry > now);
address->expiry = new_expiry;
}
}
else {
/* Never expires */
address->expiry = APR_UINT32_MAX;
}
/* One ref is for worker->address in any case */
if (worker->address || worker->cp->addr) {
apr_atomic_set32(&address->refcount, 1);
}
else {
/* Set worker->cp->addr once for compat with third-party
* modules. This addr never changed before and can't change
* underneath users now because of some TTL configuration.
* So we take one more ref for worker->cp->addr to remain
* allocated forever (though it might not be up to date..).
* Modules should use conn->addr instead of worker->cp-addr
* to get the actual address used by each conn, determined
* at connect() time.
*/
apr_atomic_set32(&address->refcount, 2);
worker->cp->addr = address->addr;
}
/* Publish the changes. The old worker address (if any) is no
* longer used by this worker, it will be destroyed now if the
* worker is the last user (refcount == 1) or by the last conn
* using it (refcount > 1).
*/
worker_address_set(worker, address);
}
/* Take the ref for conn->address (before dropping the mutex so to
* let no chance for this address be killed before it's used!)
*/
proxy_address_inc(address);
PROXY_THREAD_UNLOCK(worker);
/* Kill any socket using the old address */
if (conn->sock) {
if (r ? APLOGrdebug(r) : APLOGdebug(s)) {
/* XXX: this requires the old conn->addr[ess] to still
* be alive since it's not copied by apr_socket_connect()
* in ap_proxy_connect_backend().
*/
apr_sockaddr_t *local_addr = NULL;
apr_sockaddr_t *remote_addr = NULL;
apr_socket_addr_get(&local_addr, APR_LOCAL, conn->sock);
apr_socket_addr_get(&remote_addr, APR_REMOTE, conn->sock);
if (r) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(10481)
"%s: closing connection to %s (%pI<>%pI) on "
"address change", proxy_function, hostname,
local_addr, remote_addr);
}
else {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(10482)
"%s: closing connection to %s (%pI<>%pI) on "
"address change", proxy_function, hostname,
local_addr, remote_addr);
}
}
socket_cleanup(conn);
}
/* Kill the old address (if any) and use the new one */
if (conn->address) {
apr_pool_cleanup_run(conn->pool, conn->address,
proxy_address_cleanup);
}
apr_pool_cleanup_register(conn->pool, address,
proxy_address_cleanup,
apr_pool_cleanup_null);
address_cleanup(conn);
conn->address = address;
conn->hostname = address->hostname;
conn->port = address->hostport;
conn->addr = address->addr;
}
}
return APR_SUCCESS;
}
PROXY_DECLARE(int)
ap_proxy_determine_connection(apr_pool_t *p, request_rec *r,
proxy_server_conf *conf,
proxy_worker *worker,
proxy_conn_rec *conn,
apr_uri_t *uri,
char **url,
const char *proxyname,
apr_port_t proxyport,
char *server_portstr,
int server_portstr_size)
{
int server_port;
const char *uds_path;
/*
* Break up the URL to determine the host to connect to
*/
/* we break the URL into host, port, uri */
if (APR_SUCCESS != apr_uri_parse(p, *url, uri)) {
return ap_proxyerror(r, HTTP_BAD_REQUEST,
apr_pstrcat(p,"URI cannot be parsed: ", *url,
NULL));
}
if (!uri->port) {
uri->port = ap_proxy_port_of_scheme(uri->scheme);
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00944)
"connecting %s to %s:%d", *url, uri->hostname, uri->port);
/* Close a possible existing socket if we are told to do so */
if (conn->close) {
socket_cleanup(conn);
conn->close = 0;
}
/*
* allocate these out of the specified connection pool
* The scheme handler decides if this is permanent or
* short living pool.
*/
/* Unless we are connecting the backend via a (forward Proxy)Remote, we
* have to use the original form of the URI (non absolute), but this is
* also the case via a remote proxy using the CONNECT method since the
* original request (and URI) is to be embedded in the body.
*/
if (!proxyname || conn->is_ssl) {
*url = apr_pstrcat(p, uri->path, uri->query ? "?" : "",
uri->query ? uri->query : "",
uri->fragment ? "#" : "",
uri->fragment ? uri->fragment : "", NULL);
}
/*
* Figure out if our passed in proxy_conn_rec has a usable
* address cached.
*
* TODO: Handle this much better...
*
* XXX: If generic workers are ever address-reusable, we need
* to check host and port on the conn and be careful about
* spilling the cached addr from the worker.
*/
uds_path = (*worker->s->uds_path
? worker->s->uds_path
: apr_table_get(r->notes, "uds_path"));
if (uds_path) {
if (!conn->uds_path || strcmp(conn->uds_path, uds_path) != 0) {
apr_pool_t *pool = conn->pool;
if (conn->uds_path) {
address_cleanup(conn);
if (!conn->uds_pool) {
apr_pool_create(&conn->uds_pool, worker->cp->dns_pool);
}
pool = conn->uds_pool;
}
/*
* In UDS cases, some structs are NULL. Protect from de-refs
* and provide info for logging at the same time.
*/
#if APR_HAVE_SOCKADDR_UN
apr_sockaddr_info_get(&conn->addr, uds_path, APR_UNIX, 0, 0, pool);
if (conn->addr && conn->addr->hostname) {
conn->uds_path = conn->addr->hostname;
}
else {
conn->uds_path = apr_pstrdup(pool, uds_path);
}
#else
apr_sockaddr_info_get(&conn->addr, NULL, APR_UNSPEC, 0, 0, pool);
conn->uds_path = apr_pstrdup(pool, uds_path);
#endif
conn->hostname = apr_pstrdup(pool, uri->hostname);
conn->port = uri->port;
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02545)
"%s: has determined UDS as %s (for %s:%hu)",
uri->scheme, conn->uds_path, conn->hostname, conn->port);
}
else {
const char *hostname = uri->hostname;
apr_port_t hostport = uri->port;
/* Not a remote CONNECT until further notice */
conn->forward = NULL;
if (proxyname) {
hostname = proxyname;
hostport = proxyport;
/*
* If we have a remote proxy and the protocol is HTTPS,
* then we need to prepend a HTTP CONNECT request before
* sending our actual HTTPS requests.
*/
if (conn->is_ssl) {
forward_info *forward;
const char *proxy_auth;
/* Do we want to pass Proxy-Authorization along?
* If we haven't used it, then YES
* If we have used it then MAYBE: RFC2616 says we MAY propagate it.
* So let's make it configurable by env.
* The logic here is the same used in mod_proxy_http.
*/
proxy_auth = apr_table_get(r->notes, "proxy-basic-creds");
if (proxy_auth == NULL
&& (r->user == NULL /* we haven't yet authenticated */
|| apr_table_get(r->subprocess_env, "Proxy-Chain-Auth"))) {
proxy_auth = apr_table_get(r->headers_in, "Proxy-Authorization");
}
if (proxy_auth != NULL && proxy_auth[0] == '\0') {
proxy_auth = NULL;
}
/* Reset forward info if they changed */
if (!(forward = conn->forward)
|| forward->target_port != uri->port
|| ap_cstr_casecmp(forward->target_host, uri->hostname) != 0
|| (forward->proxy_auth != NULL) != (proxy_auth != NULL)
|| (forward->proxy_auth != NULL && proxy_auth != NULL &&
strcmp(forward->proxy_auth, proxy_auth) != 0)) {
apr_pool_t *fwd_pool = conn->pool;
if (worker->s->is_address_reusable) {
if (conn->fwd_pool) {
apr_pool_clear(conn->fwd_pool);
}
else {
apr_pool_create(&conn->fwd_pool, conn->pool);
}
fwd_pool = conn->fwd_pool;
}
forward = apr_pcalloc(fwd_pool, sizeof(forward_info));
conn->forward = forward;
/*
* Save our real backend data for using it later during HTTP CONNECT.
*/
forward->use_http_connect = 1;
forward->target_host = apr_pstrdup(fwd_pool, uri->hostname);
forward->target_port = uri->port;
if (proxy_auth) {
forward->proxy_auth = apr_pstrdup(fwd_pool, proxy_auth);
}
}
}
}
if (conn->hostname
&& (conn->port != hostport
|| ap_cstr_casecmp(conn->hostname, hostname) != 0)) {
address_cleanup(conn);
}
/* Resolve the connection address with the determined hostname/port */
if (ap_proxy_determine_address(uri->scheme, conn, hostname, hostport,
0, r, NULL)) {
return HTTP_INTERNAL_SERVER_ERROR;
}
}
/* Get the server port for the Via headers */
server_port = ap_get_server_port(r);
AP_DEBUG_ASSERT(server_portstr_size > 0);
if (ap_is_default_port(server_port, r)) {
server_portstr[0] = '\0';
}
else {
apr_snprintf(server_portstr, server_portstr_size, ":%d",
server_port);
}
/* check if ProxyBlock directive on this host */
if (OK != ap_proxy_checkproxyblock2(r, conf, uri->hostname,
proxyname ? NULL : conn->addr)) {
return ap_proxyerror(r, HTTP_FORBIDDEN,
"Connect to remote machine blocked");
}
/*
* When SSL is configured, determine the hostname (SNI) for the request
* and save it in conn->ssl_hostname. Close any reused connection whose
* SNI differs.
*/
if (conn->is_ssl) {
proxy_dir_conf *dconf;
const char *ssl_hostname;
/*
* In the case of ProxyPreserveHost on use the hostname of
* the request if present otherwise use the one from the
* backend request URI.
*/
dconf = ap_get_module_config(r->per_dir_config, &proxy_module);
if (dconf->preserve_host) {
ssl_hostname = r->hostname;
}
else if (conn->forward
&& ((forward_info *)(conn->forward))->use_http_connect) {
ssl_hostname = ((forward_info *)conn->forward)->target_host;
}
else {
ssl_hostname = conn->hostname;
}
/*
* Close if a SNI is in use but this request requires no or
* a different one, or no SNI is in use but one is required.
*/
if ((conn->ssl_hostname && (!ssl_hostname ||
strcasecmp(conn->ssl_hostname,
ssl_hostname) != 0)) ||
(!conn->ssl_hostname && ssl_hostname && conn->sock)) {
socket_cleanup(conn);
}
if (conn->ssl_hostname == NULL) {
conn->ssl_hostname = apr_pstrdup(conn->scpool, ssl_hostname);
}
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00947)
"connecting %s to %pI (%s:%hu)", *url,
conn->addr, conn->hostname, conn->port);
return OK;
}
#define USE_ALTERNATE_IS_CONNECTED 1
#if !defined(APR_MSG_PEEK) && defined(MSG_PEEK)
#define APR_MSG_PEEK MSG_PEEK
#endif
#if USE_ALTERNATE_IS_CONNECTED && defined(APR_MSG_PEEK)
PROXY_DECLARE(int) ap_proxy_is_socket_connected(apr_socket_t *socket)
{
apr_pollfd_t pfds[1];
apr_status_t status;
apr_int32_t nfds;
pfds[0].reqevents = APR_POLLIN;
pfds[0].desc_type = APR_POLL_SOCKET;
pfds[0].desc.s = socket;
do {
status = apr_poll(&pfds[0], 1, &nfds, 0);
} while (APR_STATUS_IS_EINTR(status));
if (status == APR_SUCCESS && nfds == 1 &&
pfds[0].rtnevents == APR_POLLIN) {
apr_sockaddr_t unused;
apr_size_t len = 1;
char buf[1];
/* The socket might be closed in which case
* the poll will return POLLIN.
* If there is no data available the socket
* is closed.
*/
status = apr_socket_recvfrom(&unused, socket, APR_MSG_PEEK,
&buf[0], &len);
if (status == APR_SUCCESS && len)
return 1;
else
return 0;
}
else if (APR_STATUS_IS_EAGAIN(status) || APR_STATUS_IS_TIMEUP(status)) {
return 1;
}
return 0;
}
#else
PROXY_DECLARE(int) ap_proxy_is_socket_connected(apr_socket_t *sock)
{
apr_size_t buffer_len = 1;
char test_buffer[1];
apr_status_t socket_status;
apr_interval_time_t current_timeout;
/* save timeout */
apr_socket_timeout_get(sock, &current_timeout);
/* set no timeout */
apr_socket_timeout_set(sock, 0);
socket_status = apr_socket_recv(sock, test_buffer, &buffer_len);
/* put back old timeout */
apr_socket_timeout_set(sock, current_timeout);
if (APR_STATUS_IS_EOF(socket_status)
|| APR_STATUS_IS_ECONNRESET(socket_status)) {
return 0;
}
else {
return 1;
}
}
#endif /* USE_ALTERNATE_IS_CONNECTED */
/*
* Send a HTTP CONNECT request to a forward proxy.
* The proxy is given by "backend", the target server
* is contained in the "forward" member of "backend".
*/
static apr_status_t send_http_connect(proxy_conn_rec *backend,
server_rec *s)
{
int status;
apr_size_t nbytes;
apr_size_t left;
int complete = 0;
char buffer[HUGE_STRING_LEN];
char drain_buffer[HUGE_STRING_LEN];
forward_info *forward = (forward_info *)backend->forward;
int len = 0;
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00948)
"CONNECT: sending the CONNECT request for %s:%d "
"to the remote proxy %pI (%s)",
forward->target_host, forward->target_port,
backend->addr, backend->hostname);
/* Create the CONNECT request */
nbytes = apr_snprintf(buffer, sizeof(buffer),
"CONNECT %s:%d HTTP/1.0" CRLF,
forward->target_host, forward->target_port);
/* Add proxy authorization from the configuration, or initial
* request if necessary */
if (forward->proxy_auth != NULL) {
nbytes += apr_snprintf(buffer + nbytes, sizeof(buffer) - nbytes,
"Proxy-Authorization: %s" CRLF,
forward->proxy_auth);
}
/* Set a reasonable agent and send everything */
nbytes += apr_snprintf(buffer + nbytes, sizeof(buffer) - nbytes,
"Proxy-agent: %s" CRLF CRLF,
ap_get_server_banner());
ap_xlate_proto_to_ascii(buffer, nbytes);
apr_socket_send(backend->sock, buffer, &nbytes);
/* Receive the whole CONNECT response */
left = sizeof(buffer) - 1;
/* Read until we find the end of the headers or run out of buffer */
do {
nbytes = left;
status = apr_socket_recv(backend->sock, buffer + len, &nbytes);
len += nbytes;
left -= nbytes;
buffer[len] = '\0';
if (strstr(buffer + len - nbytes, CRLF_ASCII CRLF_ASCII) != NULL) {
ap_xlate_proto_from_ascii(buffer, len);
complete = 1;
break;
}
} while (status == APR_SUCCESS && left > 0);
/* Drain what's left */
if (!complete) {
nbytes = sizeof(drain_buffer) - 1;
while (status == APR_SUCCESS && nbytes) {
status = apr_socket_recv(backend->sock, drain_buffer, &nbytes);
drain_buffer[nbytes] = '\0';
nbytes = sizeof(drain_buffer) - 1;
if (strstr(drain_buffer, CRLF_ASCII CRLF_ASCII) != NULL) {
break;
}
}
}
/* Check for HTTP_OK response status */
if (status == APR_SUCCESS) {
unsigned int major, minor;
/* Only scan for three character status code */
char code_str[4];
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00949)
"send_http_connect: response from the forward proxy: %s",
buffer);
/* Extract the returned code */
if (sscanf(buffer, "HTTP/%u.%u %3s", &major, &minor, code_str) == 3) {
status = atoi(code_str);
if (status == HTTP_OK) {
status = APR_SUCCESS;
}
else {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00950)
"send_http_connect: the forward proxy returned code is '%s'",
code_str);
status = APR_INCOMPLETE;
}
}
}
return(status);
}
/* TODO: In APR 2.x: Extend apr_sockaddr_t to possibly be a path !!! */
PROXY_DECLARE(apr_status_t) ap_proxy_connect_uds(apr_socket_t *sock,
const char *uds_path,
apr_pool_t *p)
{
#if APR_HAVE_SYS_UN_H
apr_status_t rv;
apr_os_sock_t rawsock;
apr_interval_time_t t;
struct sockaddr_un *sa;
apr_socklen_t addrlen, pathlen;
rv = apr_os_sock_get(&rawsock, sock);
if (rv != APR_SUCCESS) {
return rv;
}
rv = apr_socket_timeout_get(sock, &t);
if (rv != APR_SUCCESS) {
return rv;
}
pathlen = strlen(uds_path);
/* copy the UDS path (including NUL) to the sockaddr_un */
addrlen = APR_OFFSETOF(struct sockaddr_un, sun_path) + pathlen;
sa = (struct sockaddr_un *)apr_palloc(p, addrlen + 1);
memcpy(sa->sun_path, uds_path, pathlen + 1);
sa->sun_family = AF_UNIX;
do {
rv = connect(rawsock, (struct sockaddr*)sa, addrlen);
} while (rv == -1 && (rv = errno) == EINTR);
if (rv && rv != EISCONN) {
if ((rv == EINPROGRESS || rv == EALREADY) && (t > 0)) {
#if APR_MAJOR_VERSION < 2
rv = apr_wait_for_io_or_timeout(NULL, sock, 0);
#else
rv = apr_socket_wait(sock, APR_WAIT_WRITE);
#endif
}
if (rv != APR_SUCCESS) {
return rv;
}
}
return APR_SUCCESS;
#else
return APR_ENOTIMPL;
#endif
}
PROXY_DECLARE(apr_status_t) ap_proxy_check_connection(const char *scheme,
proxy_conn_rec *conn,
server_rec *server,
unsigned max_blank_lines,
int flags)
{
apr_status_t rv = APR_SUCCESS;
proxy_worker *worker = conn->worker;
if (!PROXY_WORKER_IS_USABLE(worker)) {
/*
* The worker is in error likely done by a different thread / process
* e.g. for a timeout or bad status. We should respect this and should
* not continue with a connection via this worker even if we got one.
*/
rv = APR_EINVAL;
}
else if (conn->connection) {
/* We have a conn_rec, check the full filter stack for things like
* SSL alert/shutdown, filters aside data...
*/
rv = ap_check_pipeline(conn->connection, conn->tmp_bb,
max_blank_lines);
apr_brigade_cleanup(conn->tmp_bb);
if (rv == APR_SUCCESS) {
/* Some data available, the caller might not want them. */
if (flags & PROXY_CHECK_CONN_EMPTY) {
rv = APR_ENOTEMPTY;
}
}
else if (APR_STATUS_IS_EAGAIN(rv)) {
/* Filter chain is OK and empty, yet we can't determine from
* ap_check_pipeline (actually ap_core_input_filter) whether
* an empty non-blocking read is EAGAIN or EOF on the socket
* side (it's always SUCCESS), so check it explicitly here.
*/
if (ap_proxy_is_socket_connected(conn->sock)) {
rv = APR_SUCCESS;
}
else {
rv = APR_EPIPE;
}
}
}
else if (conn->sock) {
/* For modules working with sockets directly, check it. */
if (!ap_proxy_is_socket_connected(conn->sock)) {
rv = APR_EPIPE;
}
}
else {
rv = APR_ENOSOCKET;
}
if (rv == APR_SUCCESS) {
if (APLOGtrace2(server)) {
apr_sockaddr_t *local_addr = NULL;
apr_socket_addr_get(&local_addr, APR_LOCAL, conn->sock);
ap_log_error(APLOG_MARK, APLOG_TRACE2, 0, server,
"%s: reusing backend connection %pI<>%pI",
scheme, local_addr, conn->addr);
}
}
else if (conn->sock) {
/* This clears conn->scpool (and associated data), so backup and
* restore any ssl_hostname for this connection set earlier by
* ap_proxy_determine_connection().
*/
char ssl_hostname[PROXY_WORKER_RFC1035_NAME_SIZE];
if (rv == APR_EINVAL
|| !conn->ssl_hostname
|| PROXY_STRNCPY(ssl_hostname, conn->ssl_hostname)) {
ssl_hostname[0] = '\0';
}
socket_cleanup(conn);
if (rv != APR_ENOTEMPTY) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, server, APLOGNO(00951)
"%s: backend socket is disconnected.", scheme);
}
else {
ap_log_error(APLOG_MARK, APLOG_INFO, 0, server, APLOGNO(03408)
"%s: reusable backend connection is not empty: "
"forcibly closed", scheme);
}
if (ssl_hostname[0]) {
conn->ssl_hostname = apr_pstrdup(conn->scpool, ssl_hostname);
}
}
return rv;
}
PROXY_DECLARE(int) ap_proxy_connect_backend(const char *proxy_function,
proxy_conn_rec *conn,
proxy_worker *worker,
server_rec *s)
{
apr_status_t rv;
int loglevel;
forward_info *forward = conn->forward;
apr_sockaddr_t *backend_addr;
/* the local address to use for the outgoing connection */
apr_sockaddr_t *local_addr;
apr_socket_t *newsock;
void *sconf = s->module_config;
int address_reusable = worker->s->is_address_reusable;
int did_dns_lookup = 0;
proxy_server_conf *conf =
(proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
rv = ap_proxy_check_connection(proxy_function, conn, s, 0, 0);
if (rv == APR_EINVAL) {
return DECLINED;
}
/* We'll set conn->addr to the address actually connect()ed, so if the
* network connection is not reused (per ap_proxy_check_connection()
* above) we need to reset conn->addr to the first resolved address
* and try to connect it first.
*/
if (conn->address && rv != APR_SUCCESS) {
conn->addr = conn->address->addr;
}
backend_addr = conn->addr;
while (rv != APR_SUCCESS && (backend_addr || conn->uds_path)) {
#if APR_HAVE_SYS_UN_H
if (conn->uds_path)
{
rv = apr_socket_create(&newsock, AF_UNIX, SOCK_STREAM, 0,
conn->scpool);
if (rv != APR_SUCCESS) {
loglevel = APLOG_ERR;
ap_log_error(APLOG_MARK, loglevel, rv, s, APLOGNO(02453)
"%s: error creating Unix domain socket "
"%s (%s:%hu)",
proxy_function,
conn->uds_path,
conn->hostname, conn->port);
break;
}
conn->connection = NULL;
rv = ap_proxy_connect_uds(newsock, conn->uds_path, conn->scpool);
if (rv != APR_SUCCESS) {
apr_socket_close(newsock);
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(02454)
"%s: attempt to connect to Unix domain socket "
"%s (%s:%hu) failed",
proxy_function, conn->uds_path,
conn->hostname, conn->port);
break;
}
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02823)
"%s: connection established with Unix domain socket "
"%s (%s:%hu)",
proxy_function,
conn->uds_path,
conn->hostname, conn->port);
}
else
#endif
{
if ((rv = apr_socket_create(&newsock, backend_addr->family,
SOCK_STREAM, APR_PROTO_TCP,
conn->scpool)) != APR_SUCCESS) {
loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
ap_log_error(APLOG_MARK, loglevel, rv, s, APLOGNO(00952)
"%s: error creating fam %d socket to %pI for "
"(%s:%hu)",
proxy_function,
backend_addr->family, backend_addr,
conn->hostname, conn->port);
/*
* this could be an IPv6 address from the DNS but the
* local machine won't give us an IPv6 socket; hopefully the
* DNS returned an additional address to try
*/
backend_addr = backend_addr->next;
continue;
}
conn->connection = NULL;
if (worker->s->recv_buffer_size > 0 &&
(rv = apr_socket_opt_set(newsock, APR_SO_RCVBUF,
worker->s->recv_buffer_size))) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00953)
"apr_socket_opt_set(SO_RCVBUF): Failed to set "
"ProxyReceiveBufferSize, using default");
}
rv = apr_socket_opt_set(newsock, APR_TCP_NODELAY, 1);
if (rv != APR_SUCCESS && rv != APR_ENOTIMPL) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00954)
"apr_socket_opt_set(APR_TCP_NODELAY): "
"Failed to set");
}
/* Set a timeout for connecting to the backend on the socket */
if (worker->s->conn_timeout_set) {
apr_socket_timeout_set(newsock, worker->s->conn_timeout);
}
else if (worker->s->timeout_set) {
apr_socket_timeout_set(newsock, worker->s->timeout);
}
else if (conf->timeout_set) {
apr_socket_timeout_set(newsock, conf->timeout);
}
else {
apr_socket_timeout_set(newsock, s->timeout);
}
/* Set a keepalive option */
if (worker->s->keepalive) {
if ((rv = apr_socket_opt_set(newsock,
APR_SO_KEEPALIVE, 1)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00955)
"apr_socket_opt_set(SO_KEEPALIVE): Failed to set"
" Keepalive");
}
}
ap_log_error(APLOG_MARK, APLOG_TRACE2, 0, s,
"%s: fam %d socket created for %pI (%s:%hu)",
proxy_function, backend_addr->family, backend_addr,
conn->hostname, conn->port);
if (conf->source_address_set) {
local_addr = apr_pmemdup(conn->scpool, conf->source_address,
sizeof(apr_sockaddr_t));
local_addr->pool = conn->scpool;
rv = apr_socket_bind(newsock, local_addr);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00956)
"%s: failed to bind socket to local address",
proxy_function);
}
}
/* make the connection out of the socket */
rv = apr_socket_connect(newsock, backend_addr);
/* if an error occurred, loop round and try again */
if (rv != APR_SUCCESS) {
apr_socket_close(newsock);
loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
ap_log_error(APLOG_MARK, loglevel, rv, s, APLOGNO(00957)
"%s: attempt to connect to %pI (%s:%hu) failed",
proxy_function, backend_addr,
conn->hostname, conn->port);
backend_addr = backend_addr->next;
/*
* If we run out of resolved IP's when connecting and if
* we cache the resolution in the worker the resolution
* might have changed. Hence try a DNS lookup to see if this
* helps.
*/
if (!backend_addr && address_reusable && !did_dns_lookup) {
/* Issue a new DNS lookup to check if the address changed,
* in which case (SUCCESS) restart the loop with the new
* one(s), otherwise leave (nothing we can do about it).
*/
if (ap_proxy_determine_address(proxy_function, conn,
conn->hostname, conn->port,
PROXY_DETERMINE_ADDRESS_CHECK,
NULL, s) == APR_SUCCESS) {
backend_addr = conn->addr;
}
/*
* In case of an error backend_addr will be NULL which
* is enough to leave the loop. If successful we'll retry
* the new addresses only once.
*/
did_dns_lookup = 1;
}
continue;
}
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02824)
"%s: connection established with %pI (%s:%hu)",
proxy_function, backend_addr,
conn->hostname, conn->port);
/* Set the actual sockaddr we are connected to */
conn->addr = backend_addr;
}
/* Set a timeout on the socket */
if (worker->s->timeout_set) {
apr_socket_timeout_set(newsock, worker->s->timeout);
}
else if (conf->timeout_set) {
apr_socket_timeout_set(newsock, conf->timeout);
}
else {
apr_socket_timeout_set(newsock, s->timeout);
}
conn->sock = newsock;
if (forward && forward->use_http_connect) {
/*
* For HTTP CONNECT we need to prepend CONNECT request before
* sending our actual HTTPS requests.
*/
{
rv = send_http_connect(conn, s);
/* If an error occurred, loop round and try again */
if (rv != APR_SUCCESS) {
conn->sock = NULL;
apr_socket_close(newsock);
loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
ap_log_error(APLOG_MARK, loglevel, rv, s, APLOGNO(00958)
"%s: attempt to connect to %s:%hu "
"via http CONNECT through %pI (%s:%hu) failed",
proxy_function,
forward->target_host, forward->target_port,
backend_addr, conn->hostname, conn->port);
backend_addr = backend_addr->next;
continue;
}
}
}
}
if (PROXY_WORKER_IS_USABLE(worker)) {
/*
* Put the entire worker to error state if
* the PROXY_WORKER_IGNORE_ERRORS flag is not set.
* Although some connections may be alive
* no further connections to the worker could be made
*/
if (rv != APR_SUCCESS) {
if (!(worker->s->status & PROXY_WORKER_IGNORE_ERRORS)) {
worker->s->error_time = apr_time_now();
worker->s->status |= PROXY_WORKER_IN_ERROR;
ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00959)
"ap_proxy_connect_backend disabling worker for (%s:%hu) "
"for %" APR_TIME_T_FMT "s",
worker->s->hostname_ex, (int)worker->s->port,
apr_time_sec(worker->s->retry));
}
}
else {
if (worker->s->retries) {
/*
* A worker came back. So here is where we need to
* either reset all params to initial conditions or
* apply some sort of aging
*/
}
worker->s->error_time = 0;
worker->s->retries = 0;
}
}
else {
/*
* The worker is in error likely done by a different thread / process
* e.g. for a timeout or bad status. We should respect this and should
* not continue with a connection via this worker even if we got one.
*/
if (rv == APR_SUCCESS) {
socket_cleanup(conn);
}
rv = APR_EINVAL;
}
return rv == APR_SUCCESS ? OK : DECLINED;
}
static apr_status_t connection_shutdown(void *theconn)
{
proxy_conn_rec *conn = (proxy_conn_rec *)theconn;
conn_rec *c = conn->connection;
if (c) {
if (!c->aborted) {
apr_interval_time_t saved_timeout = 0;
apr_socket_timeout_get(conn->sock, &saved_timeout);
if (saved_timeout) {
apr_socket_timeout_set(conn->sock, 0);
}
(void)ap_shutdown_conn(c, 0);
c->aborted = 1;
if (saved_timeout) {
apr_socket_timeout_set(conn->sock, saved_timeout);
}
}
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(02642)
"proxy: connection shutdown");
}
return APR_SUCCESS;
}
static int proxy_connection_create(const char *proxy_function,
proxy_conn_rec *conn,
request_rec *r, server_rec *s)
{
ap_conf_vector_t *per_dir_config = (r) ? r->per_dir_config
: conn->worker->section_config;
apr_sockaddr_t *backend_addr = conn->addr;
int rc;
apr_interval_time_t current_timeout;
apr_bucket_alloc_t *bucket_alloc;
if (conn->connection) {
if (conn->is_ssl) {
/* on reuse, reinit the SSL connection dir config with the current
* r->per_dir_config, the previous one was reset on release.
*/
ap_proxy_ssl_engine(conn->connection, per_dir_config, 1);
}
return OK;
}
bucket_alloc = apr_bucket_alloc_create(conn->scpool);
conn->tmp_bb = apr_brigade_create(conn->scpool, bucket_alloc);
/*
* The socket is now open, create a new backend server connection
*/
conn->connection = ap_run_create_connection(conn->scpool, s, conn->sock,
0, NULL,
bucket_alloc);
if (!conn->connection) {
/*
* the peer reset the connection already; ap_run_create_connection()
* closed the socket
*/
ap_log_error(APLOG_MARK, APLOG_ERR, 0,
s, APLOGNO(00960) "%s: an error occurred creating a "
"new connection to %pI (%s)", proxy_function,
backend_addr, conn->hostname);
/* XXX: Will be closed when proxy_conn is closed */
socket_cleanup(conn);
return HTTP_INTERNAL_SERVER_ERROR;
}
/* For ssl connection to backend */
if (conn->is_ssl) {
if (!ap_proxy_ssl_engine(conn->connection, per_dir_config, 1)) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0,
s, APLOGNO(00961) "%s: failed to enable ssl support "
"for %pI (%s)", proxy_function,
backend_addr, conn->hostname);
return HTTP_INTERNAL_SERVER_ERROR;
}
if (conn->ssl_hostname) {
/* Set a note on the connection about what CN is requested,
* such that mod_ssl can check if it is requested to do so.
*/
ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, conn->connection,
"%s: set SNI to %s for (%s)", proxy_function,
conn->ssl_hostname, conn->hostname);
apr_table_setn(conn->connection->notes, "proxy-request-hostname",
conn->ssl_hostname);
}
}
else {
/* TODO: See if this will break FTP */
ap_proxy_ssl_engine(conn->connection, per_dir_config, 0);
}
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00962)
"%s: connection complete to %pI (%s)",
proxy_function, backend_addr, conn->hostname);
/*
* save the timeout of the socket because core_pre_connection
* will set it to base_server->timeout
* (core TimeOut directive).
*/
apr_socket_timeout_get(conn->sock, &current_timeout);
/* set up the connection filters */
rc = ap_run_pre_connection(conn->connection, conn->sock);
if (rc != OK && rc != DONE) {
conn->connection->aborted = 1;
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00963)
"%s: pre_connection setup failed (%d)",
proxy_function, rc);
return rc;
}
apr_socket_timeout_set(conn->sock, current_timeout);
/* Shutdown the connection before closing it (eg. SSL connections
* need to be close-notify-ed).
*/
apr_pool_pre_cleanup_register(conn->scpool, conn, connection_shutdown);
return OK;
}
PROXY_DECLARE(int) ap_proxy_connection_create_ex(const char *proxy_function,
proxy_conn_rec *conn,
request_rec *r)
{
return proxy_connection_create(proxy_function, conn, r, r->server);
}
PROXY_DECLARE(int) ap_proxy_connection_create(const char *proxy_function,
proxy_conn_rec *conn,
conn_rec *c, server_rec *s)
{
(void) c; /* unused */
return proxy_connection_create(proxy_function, conn, NULL, s);
}
int ap_proxy_lb_workers(void)
{
/*
* Since we can't resize the scoreboard when reconfiguring, we
* have to impose a limit on the number of workers, we are
* able to reconfigure to.
*/
if (!lb_workers_limit)
lb_workers_limit = proxy_lb_workers + PROXY_DYNAMIC_BALANCER_LIMIT;
return lb_workers_limit;
}
static APR_INLINE int error_code_overridden(const int *elts, int nelts,
int code)
{
int min = 0;
int max = nelts - 1;
AP_DEBUG_ASSERT(max >= 0);
while (min < max) {
int mid = (min + max) / 2;
int val = elts[mid];
if (val < code) {
min = mid + 1;
}
else if (val > code) {
max = mid - 1;
}
else {
return 1;
}
}
return elts[min] == code;
}
PROXY_DECLARE(int) ap_proxy_should_override(proxy_dir_conf *conf, int code)
{
if (!conf->error_override)
return 0;
if (apr_is_empty_array(conf->error_override_codes))
return ap_is_HTTP_ERROR(code);
/* Since error_override_codes is sorted, apply binary search. */
return error_code_overridden((int *)conf->error_override_codes->elts,
conf->error_override_codes->nelts,
code);
}
PROXY_DECLARE(void) ap_proxy_backend_broke(request_rec *r,
apr_bucket_brigade *brigade)
{
apr_bucket *e;
conn_rec *c = r->connection;
r->no_cache = 1;
/*
* If this is a subrequest, then prevent also caching of the main
* request.
*/
if (r->main)
r->main->no_cache = 1;
e = ap_bucket_error_create(HTTP_BAD_GATEWAY, NULL, c->pool,
c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(brigade, e);
e = apr_bucket_eos_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(brigade, e);
}
/*
* Provide a string hashing function for the proxy.
* We offer 2 methods: one is the APR model but we
* also provide our own, based on either FNV or SDBM.
* The reason is in case we want to use both to ensure no
* collisions.
*/
PROXY_DECLARE(unsigned int)
ap_proxy_hashfunc(const char *str, proxy_hash_t method)
{
if (method == PROXY_HASHFUNC_APR) {
apr_ssize_t slen = strlen(str);
return apr_hashfunc_default(str, &slen);
}
else if (method == PROXY_HASHFUNC_FNV) {
/* FNV model */
unsigned int hash;
const unsigned int fnv_prime = 0x811C9DC5;
for (hash = 0; *str; str++) {
hash *= fnv_prime;
hash ^= (*str);
}
return hash;
}
else { /* method == PROXY_HASHFUNC_DEFAULT */
/* SDBM model */
unsigned int hash;
for (hash = 0; *str; str++) {
hash = (*str) + (hash << 6) + (hash << 16) - hash;
}
return hash;
}
}
PROXY_DECLARE(apr_status_t) ap_proxy_set_wstatus(char c, int set, proxy_worker *w)
{
unsigned int *status = &w->s->status;
char flag = toupper(c);
proxy_wstat_t *pwt = proxy_wstat_tbl;
while (pwt->bit) {
if (flag == pwt->flag) {
if (set)
*status |= pwt->bit;
else
*status &= ~(pwt->bit);
return APR_SUCCESS;
}
pwt++;
}
return APR_EINVAL;
}
PROXY_DECLARE(char *) ap_proxy_parse_wstatus(apr_pool_t *p, proxy_worker *w)
{
char *ret = "";
unsigned int status = w->s->status;
proxy_wstat_t *pwt = proxy_wstat_tbl;
while (pwt->bit) {
if (status & pwt->bit)
ret = apr_pstrcat(p, ret, pwt->name, NULL);
pwt++;
}
if (!*ret) {
ret = "??? ";
}
if (PROXY_WORKER_IS_USABLE(w))
ret = apr_pstrcat(p, ret, "Ok ", NULL);
return ret;
}
PROXY_DECLARE(apr_status_t) ap_proxy_sync_balancer(proxy_balancer *b, server_rec *s,
proxy_server_conf *conf)
{
proxy_worker **workers;
int i;
int index;
proxy_worker_shared *shm;
proxy_balancer_method *lbmethod;
ap_slotmem_provider_t *storage = b->storage;
if (b->s->wupdated <= b->wupdated)
return APR_SUCCESS;
/* balancer sync */
lbmethod = ap_lookup_provider(PROXY_LBMETHOD, b->s->lbpname, "0");
if (lbmethod) {
b->lbmethod = lbmethod;
} else {
ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(02433)
"Cannot find LB Method: %s", b->s->lbpname);
return APR_EINVAL;
}
/* worker sync */
/*
* Look thru the list of workers in shm
* and see which one(s) we are lacking...
* again, the cast to unsigned int is safe
* since our upper limit is always max_workers
* which is int.
*/
for (index = 0; index < b->max_workers; index++) {
int found;
apr_status_t rv;
if ((rv = storage->dptr(b->wslot, (unsigned int)index, (void *)&shm)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, APLOGNO(00965) "worker slotmem_dptr failed");
return APR_EGENERAL;
}
/* account for possible "holes" in the slotmem
* (eg: slots 0-2 are used, but 3 isn't, but 4-5 is)
*/
if (!shm->hash.def || !shm->hash.fnv)
continue;
found = 0;
workers = (proxy_worker **)b->workers->elts;
for (i = 0; i < b->workers->nelts; i++, workers++) {
proxy_worker *worker = *workers;
if (worker->hash.def == shm->hash.def && worker->hash.fnv == shm->hash.fnv) {
found = 1;
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02402)
"re-grabbing shm[%d] (0x%pp) for worker: %s", i, (void *)shm,
ap_proxy_worker_name(conf->pool, worker));
break;
}
}
if (!found) {
proxy_worker **runtime;
/* XXX: a thread mutex is maybe enough here */
apr_global_mutex_lock(proxy_mutex);
runtime = apr_array_push(b->workers);
*runtime = apr_pcalloc(conf->pool, sizeof(proxy_worker));
apr_global_mutex_unlock(proxy_mutex);
(*runtime)->hash = shm->hash;
(*runtime)->balancer = b;
(*runtime)->s = shm;
rv = ap_proxy_initialize_worker(*runtime, s, conf->pool);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, APLOGNO(00966) "Cannot init worker");
return rv;
}
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02403)
"grabbing shm[%d] (0x%pp) for worker: %s", i, (void *)shm,
(*runtime)->s->name_ex);
}
}
if (b->s->need_reset) {
if (b->lbmethod && b->lbmethod->reset)
b->lbmethod->reset(b, s);
b->s->need_reset = 0;
}
b->wupdated = b->s->wupdated;
return APR_SUCCESS;
}
PROXY_DECLARE(proxy_worker_shared *) ap_proxy_find_workershm(ap_slotmem_provider_t *storage,
ap_slotmem_instance_t *slot,
proxy_worker *worker,
unsigned int *index)
{
proxy_worker_shared *shm;
unsigned int i, limit;
limit = storage->num_slots(slot);
for (i = 0; i < limit; i++) {
if (storage->dptr(slot, i, (void *)&shm) != APR_SUCCESS) {
return NULL;
}
if ((worker->s->hash.def == shm->hash.def) &&
(worker->s->hash.fnv == shm->hash.fnv)) {
*index = i;
return shm;
}
}
return NULL;
}
PROXY_DECLARE(proxy_balancer_shared *) ap_proxy_find_balancershm(ap_slotmem_provider_t *storage,
ap_slotmem_instance_t *slot,
proxy_balancer *balancer,
unsigned int *index)
{
proxy_balancer_shared *shm;
unsigned int i, limit;
limit = storage->num_slots(slot);
for (i = 0; i < limit; i++) {
if (storage->dptr(slot, i, (void *)&shm) != APR_SUCCESS) {
return NULL;
}
if ((balancer->s->hash.def == shm->hash.def) &&
(balancer->s->hash.fnv == shm->hash.fnv)) {
*index = i;
return shm;
}
}
return NULL;
}
typedef struct header_connection {
apr_pool_t *pool;
apr_array_header_t *array;
const char *first;
unsigned int closed:1;
} header_connection;
static int find_conn_headers(void *data, const char *key, const char *val)
{
header_connection *x = data;
const char *name;
do {
while (*val == ',' || *val == ';') {
val++;
}
name = ap_get_token(x->pool, &val, 0);
if (!strcasecmp(name, "close")) {
x->closed = 1;
}
if (!x->first) {
x->first = name;
}
else {
const char **elt;
if (!x->array) {
x->array = apr_array_make(x->pool, 4, sizeof(char *));
}
elt = apr_array_push(x->array);
*elt = name;
}
} while (*val);
return 1;
}
/**
* Remove all headers referred to by the Connection header.
*/
static int ap_proxy_clear_connection(request_rec *r, apr_table_t *headers)
{
const char **name;
header_connection x;
x.pool = r->pool;
x.array = NULL;
x.first = NULL;
x.closed = 0;
apr_table_unset(headers, "Proxy-Connection");
apr_table_do(find_conn_headers, &x, headers, "Connection", NULL);
if (x.first) {
/* fast path - no memory allocated for one header */
apr_table_unset(headers, "Connection");
apr_table_unset(headers, x.first);
}
if (x.array) {
/* two or more headers */
while ((name = apr_array_pop(x.array))) {
apr_table_unset(headers, *name);
}
}
return x.closed;
}
PROXY_DECLARE(int) ap_proxy_create_hdrbrgd(apr_pool_t *p,
apr_bucket_brigade *header_brigade,
request_rec *r,
proxy_conn_rec *p_conn,
proxy_worker *worker,
proxy_server_conf *conf,
apr_uri_t *uri,
char *url, char *server_portstr,
char **old_cl_val,
char **old_te_val)
{
int rc = OK;
conn_rec *c = r->connection;
int counter;
char *buf;
apr_table_t *saved_headers_in = r->headers_in;
const char *saved_host = apr_table_get(saved_headers_in, "Host");
const apr_array_header_t *headers_in_array;
const apr_table_entry_t *headers_in;
apr_bucket *e;
int force10 = 0, do_100_continue = 0;
conn_rec *origin = p_conn->connection;
const char *host, *creds, *val;
proxy_dir_conf *dconf = ap_get_module_config(r->per_dir_config, &proxy_module);
/*
* HTTP "Ping" test? Easiest is 100-Continue. However:
* To be compliant, we only use 100-Continue for requests with bodies.
* We also make sure we won't be talking HTTP/1.0 as well.
*/
if (apr_table_get(r->subprocess_env, "force-proxy-request-1.0")) {
force10 = 1;
}
else if (apr_table_get(r->notes, "proxy-100-continue")
|| PROXY_SHOULD_PING_100_CONTINUE(worker, r)) {
do_100_continue = 1;
}
if (force10 || apr_table_get(r->subprocess_env, "proxy-nokeepalive")) {
if (origin) {
origin->keepalive = AP_CONN_CLOSE;
}
p_conn->close = 1;
}
if (force10) {
buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.0" CRLF, NULL);
}
else {
buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL);
}
ap_xlate_proto_to_ascii(buf, strlen(buf));
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
/*
* Make a copy on r->headers_in for the request we make to the backend,
* modify the copy in place according to our configuration and connection
* handling, use it to fill in the forwarded headers' brigade, and finally
* restore the saved/original ones in r->headers_in.
*
* Note: We need to take r->pool for apr_table_copy as the key / value
* pairs in r->headers_in have been created out of r->pool and
* p might be (and actually is) a longer living pool.
* This would trigger the bad pool ancestry abort in apr_table_copy if
* apr is compiled with APR_POOL_DEBUG.
*
* icing: if p indeed lives longer than r->pool, we should allocate
* all new header values from r->pool as well and avoid leakage.
*/
r->headers_in = apr_table_copy(r->pool, saved_headers_in);
/* Return the original Transfer-Encoding and/or Content-Length values
* then drop the headers, they must be set by the proxy handler based
* on the actual body being forwarded.
*/
if ((*old_te_val = (char *)apr_table_get(r->headers_in,
"Transfer-Encoding"))) {
apr_table_unset(r->headers_in, "Transfer-Encoding");
}
if ((*old_cl_val = (char *)apr_table_get(r->headers_in,
"Content-Length"))) {
apr_table_unset(r->headers_in, "Content-Length");
}
/* Clear out hop-by-hop request headers not to forward */
if (ap_proxy_clear_connection(r, r->headers_in) < 0) {
rc = HTTP_BAD_REQUEST;
goto cleanup;
}
/* RFC2616 13.5.1 says we should strip these */
apr_table_unset(r->headers_in, "Keep-Alive");
apr_table_unset(r->headers_in, "Upgrade");
apr_table_unset(r->headers_in, "Trailer");
apr_table_unset(r->headers_in, "TE");
/* Compute Host header */
if (dconf->preserve_host == 0) {
if (ap_strchr_c(uri->hostname, ':')) { /* if literal IPv6 address */
if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) {
host = apr_pstrcat(r->pool, "[", uri->hostname, "]:",
uri->port_str, NULL);
} else {
host = apr_pstrcat(r->pool, "[", uri->hostname, "]", NULL);
}
} else {
if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) {
host = apr_pstrcat(r->pool, uri->hostname, ":",
uri->port_str, NULL);
} else {
host = uri->hostname;
}
}
apr_table_setn(r->headers_in, "Host", host);
}
else {
/* don't want to use r->hostname as the incoming header might have a
* port attached, let's use the original header.
*/
host = saved_host;
if (!host) {
host = r->server->server_hostname;
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01092)
"no HTTP 0.9 request (with no host line) "
"on incoming request and preserve host set "
"forcing hostname to be %s for uri %s",
host, r->uri);
apr_table_setn(r->headers_in, "Host", host);
}
}
/* handle Via */
if (conf->viaopt == via_block) {
/* Block all outgoing Via: headers */
apr_table_unset(r->headers_in, "Via");
} else if (conf->viaopt != via_off) {
const char *server_name = ap_get_server_name(r);
/* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host,
* then the server name returned by ap_get_server_name() is the
* origin server name (which does make too much sense with Via: headers)
* so we use the proxy vhost's name instead.
*/
if (server_name == r->hostname)
server_name = r->server->server_hostname;
/* Create a "Via:" request header entry and merge it */
/* Generate outgoing Via: header with/without server comment: */
apr_table_mergen(r->headers_in, "Via",
(conf->viaopt == via_full)
? apr_psprintf(p, "%d.%d %s%s (%s)",
HTTP_VERSION_MAJOR(r->proto_num),
HTTP_VERSION_MINOR(r->proto_num),
server_name, server_portstr,
AP_SERVER_BASEVERSION)
: apr_psprintf(p, "%d.%d %s%s",
HTTP_VERSION_MAJOR(r->proto_num),
HTTP_VERSION_MINOR(r->proto_num),
server_name, server_portstr)
);
}
/* Use HTTP/1.1 100-Continue as quick "HTTP ping" test
* to backend
*/
if (do_100_continue) {
/* Add the Expect header if not already there. */
if (!(val = apr_table_get(r->headers_in, "Expect"))
|| (ap_cstr_casecmp(val, "100-Continue") != 0 /* fast path */
&& !ap_find_token(r->pool, val, "100-Continue"))) {
apr_table_mergen(r->headers_in, "Expect", "100-Continue");
}
}
else {
/* XXX: we should strip the 100-continue token only from the
* Expect header, but are there others actually used anywhere?
*/
apr_table_unset(r->headers_in, "Expect");
}
/* X-Forwarded-*: handling
*
* XXX Privacy Note:
* -----------------
*
* These request headers are only really useful when the mod_proxy
* is used in a reverse proxy configuration, so that useful info
* about the client can be passed through the reverse proxy and on
* to the backend server, which may require the information to
* function properly.
*
* In a forward proxy situation, these options are a potential
* privacy violation, as information about clients behind the proxy
* are revealed to arbitrary servers out there on the internet.
*
* The HTTP/1.1 Via: header is designed for passing client
* information through proxies to a server, and should be used in
* a forward proxy configuration instead of X-Forwarded-*. See the
* ProxyVia option for details.
*/
if (dconf->add_forwarded_headers) {
if (PROXYREQ_REVERSE == r->proxyreq) {
/* Add X-Forwarded-For: so that the upstream has a chance to
* determine, where the original request came from.
*/
apr_table_mergen(r->headers_in, "X-Forwarded-For",
r->useragent_ip);
/* Add X-Forwarded-Host: so that upstream knows what the
* original request hostname was.
*/
if (saved_host) {
apr_table_mergen(r->headers_in, "X-Forwarded-Host",
saved_host);
}
/* Add X-Forwarded-Server: so that upstream knows what the
* name of this proxy server is (if there are more than one)
* XXX: This duplicates Via: - do we strictly need it?
*/
apr_table_mergen(r->headers_in, "X-Forwarded-Server",
r->server->server_hostname);
}
}
/* Do we want to strip Proxy-Authorization ?
* If we haven't used it, then NO
* If we have used it then MAYBE: RFC2616 says we MAY propagate it.
* So let's make it configurable by env.
*/
if (r->user != NULL /* we've authenticated */
&& !apr_table_get(r->subprocess_env, "Proxy-Chain-Auth")) {
apr_table_unset(r->headers_in, "Proxy-Authorization");
}
/* for sub-requests, ignore freshness/expiry headers */
if (r->main) {
apr_table_unset(r->headers_in, "If-Match");
apr_table_unset(r->headers_in, "If-Modified-Since");
apr_table_unset(r->headers_in, "If-Range");
apr_table_unset(r->headers_in, "If-Unmodified-Since");
apr_table_unset(r->headers_in, "If-None-Match");
}
creds = apr_table_get(r->notes, "proxy-basic-creds");
if (creds) {
apr_table_mergen(r->headers_in, "Proxy-Authorization", creds);
}
/* run hook to fixup the request we are about to send */
proxy_run_fixups(r);
/* We used to send `Host: ` always first, so let's keep it that
* way. No telling which legacy backend is relying on this.
* If proxy_run_fixups() changed the value, use it (though removal
* is ignored).
*/
val = apr_table_get(r->headers_in, "Host");
if (val) {
apr_table_unset(r->headers_in, "Host");
host = val;
}
buf = apr_pstrcat(p, "Host: ", host, CRLF, NULL);
ap_xlate_proto_to_ascii(buf, strlen(buf));
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
/* Append the (remaining) headers to the brigade */
headers_in_array = apr_table_elts(r->headers_in);
headers_in = (const apr_table_entry_t *) headers_in_array->elts;
for (counter = 0; counter < headers_in_array->nelts; counter++) {
if (headers_in[counter].key == NULL
|| headers_in[counter].val == NULL) {
continue;
}
buf = apr_pstrcat(p, headers_in[counter].key, ": ",
headers_in[counter].val, CRLF,
NULL);
ap_xlate_proto_to_ascii(buf, strlen(buf));
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
}
cleanup:
r->headers_in = saved_headers_in;
return rc;
}
PROXY_DECLARE(int) ap_proxy_prefetch_input(request_rec *r,
proxy_conn_rec *backend,
apr_bucket_brigade *input_brigade,
apr_read_type_e block,
apr_off_t *bytes_read,
apr_off_t max_read)
{
apr_pool_t *p = r->pool;
conn_rec *c = r->connection;
apr_bucket_brigade *temp_brigade;
apr_status_t status;
apr_off_t bytes;
*bytes_read = 0;
if (max_read < APR_BUCKET_BUFF_SIZE) {
max_read = APR_BUCKET_BUFF_SIZE;
}
/* Prefetch max_read bytes
*
* This helps us avoid any election of C-L v.s. T-E
* request bodies, since we are willing to keep in
* memory this much data, in any case. This gives
* us an instant C-L election if the body is of some
* reasonable size.
*/
temp_brigade = apr_brigade_create(p, input_brigade->bucket_alloc);
/* Account for saved input, if any. */
apr_brigade_length(input_brigade, 0, bytes_read);
/* Ensure we don't hit a wall where we have a buffer too small for
* ap_get_brigade's filters to fetch us another bucket, surrender
* once we hit 80 bytes (an arbitrary value) less than max_read.
*/
while (*bytes_read < max_read - 80
&& (APR_BRIGADE_EMPTY(input_brigade)
|| !APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade)))) {
status = ap_get_brigade(r->input_filters, temp_brigade,
AP_MODE_READBYTES, block,
max_read - *bytes_read);
/* ap_get_brigade may return success with an empty brigade
* for a non-blocking read which would block
*/
if (block == APR_NONBLOCK_READ
&& ((status == APR_SUCCESS && APR_BRIGADE_EMPTY(temp_brigade))
|| APR_STATUS_IS_EAGAIN(status))) {
break;
}
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01095)
"prefetch request body failed to %pI (%s)"
" from %s (%s)", backend->addr,
backend->hostname ? backend->hostname : "",
c->client_ip, c->remote_host ? c->remote_host : "");
return ap_map_http_request_error(status, HTTP_BAD_REQUEST);
}
apr_brigade_length(temp_brigade, 1, &bytes);
*bytes_read += bytes;
/*
* Save temp_brigade in input_brigade. (At least) in the SSL case
* temp_brigade contains transient buckets whose data would get
* overwritten during the next call of ap_get_brigade in the loop.
* ap_save_brigade ensures these buckets to be set aside.
* Calling ap_save_brigade with NULL as filter is OK, because
* input_brigade already has been created and does not need to get
* created by ap_save_brigade.
*/
status = ap_save_brigade(NULL, &input_brigade, &temp_brigade, p);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01096)
"processing prefetched request body failed"
" to %pI (%s) from %s (%s)", backend->addr,
backend->hostname ? backend->hostname : "",
c->client_ip, c->remote_host ? c->remote_host : "");
return HTTP_INTERNAL_SERVER_ERROR;
}
}
return OK;
}
PROXY_DECLARE(int) ap_proxy_read_input(request_rec *r,
proxy_conn_rec *backend,
apr_bucket_brigade *bb,
apr_off_t max_read)
{
apr_bucket_alloc_t *bucket_alloc = bb->bucket_alloc;
apr_read_type_e block = (backend->connection) ? APR_NONBLOCK_READ
: APR_BLOCK_READ;
apr_status_t status;
int rv;
for (;;) {
apr_brigade_cleanup(bb);
status = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES,
block, max_read);
if (block == APR_BLOCK_READ
|| (!(status == APR_SUCCESS && APR_BRIGADE_EMPTY(bb))
&& !APR_STATUS_IS_EAGAIN(status))) {
break;
}
/* Flush and retry (blocking) */
apr_brigade_cleanup(bb);
rv = ap_proxy_pass_brigade(bucket_alloc, r, backend,
backend->connection, bb, 1);
if (rv != OK) {
return rv;
}
block = APR_BLOCK_READ;
}
if (status != APR_SUCCESS) {
conn_rec *c = r->connection;
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02608)
"read request body failed to %pI (%s)"
" from %s (%s)", backend->addr,
backend->hostname ? backend->hostname : "",
c->client_ip, c->remote_host ? c->remote_host : "");
return ap_map_http_request_error(status, HTTP_BAD_REQUEST);
}
return OK;
}
PROXY_DECLARE(int) ap_proxy_spool_input(request_rec *r,
proxy_conn_rec *backend,
apr_bucket_brigade *input_brigade,
apr_off_t *bytes_spooled,
apr_off_t max_mem_spool)
{
apr_pool_t *p = r->pool;
int seen_eos = 0, rv = OK;
apr_status_t status = APR_SUCCESS;
apr_bucket_alloc_t *bucket_alloc = input_brigade->bucket_alloc;
apr_bucket_brigade *body_brigade;
apr_bucket *e;
apr_off_t bytes, fsize = 0;
apr_file_t *tmpfile = NULL;
*bytes_spooled = 0;
body_brigade = apr_brigade_create(p, bucket_alloc);
do {
if (APR_BRIGADE_EMPTY(input_brigade)) {
rv = ap_proxy_read_input(r, backend, input_brigade,
HUGE_STRING_LEN);
if (rv != OK) {
return rv;
}
}
/* If this brigade contains EOS, either stop or remove it. */
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
seen_eos = 1;
}
apr_brigade_length(input_brigade, 1, &bytes);
if (*bytes_spooled + bytes > max_mem_spool) {
/* can't spool any more in memory; write latest brigade to disk */
if (tmpfile == NULL) {
const char *temp_dir;
char *template;
status = apr_temp_dir_get(&temp_dir, p);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01089)
"search for temporary directory failed");
return HTTP_INTERNAL_SERVER_ERROR;
}
apr_filepath_merge(&template, temp_dir,
"modproxy.tmp.XXXXXX",
APR_FILEPATH_NATIVE, p);
status = apr_file_mktemp(&tmpfile, template, 0, p);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01090)
"creation of temporary file in directory "
"%s failed", temp_dir);
return HTTP_INTERNAL_SERVER_ERROR;
}
}
for (e = APR_BRIGADE_FIRST(input_brigade);
e != APR_BRIGADE_SENTINEL(input_brigade);
e = APR_BUCKET_NEXT(e)) {
const char *data;
apr_size_t bytes_read, bytes_written;
apr_bucket_read(e, &data, &bytes_read, APR_BLOCK_READ);
status = apr_file_write_full(tmpfile, data, bytes_read, &bytes_written);
if (status != APR_SUCCESS) {
const char *tmpfile_name;
if (apr_file_name_get(&tmpfile_name, tmpfile) != APR_SUCCESS) {
tmpfile_name = "(unknown)";
}
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01091)
"write to temporary file %s failed",
tmpfile_name);
return HTTP_INTERNAL_SERVER_ERROR;
}
AP_DEBUG_ASSERT(bytes_read == bytes_written);
fsize += bytes_written;
}
apr_brigade_cleanup(input_brigade);
}
else {
/*
* Save input_brigade in body_brigade. (At least) in the SSL case
* input_brigade contains transient buckets whose data would get
* overwritten during the next call of ap_get_brigade in the loop.
* ap_save_brigade ensures these buckets to be set aside.
* Calling ap_save_brigade with NULL as filter is OK, because
* body_brigade already has been created and does not need to get
* created by ap_save_brigade.
*/
status = ap_save_brigade(NULL, &body_brigade, &input_brigade, p);
if (status != APR_SUCCESS) {
return HTTP_INTERNAL_SERVER_ERROR;
}
}
*bytes_spooled += bytes;
} while (!seen_eos);
APR_BRIGADE_CONCAT(input_brigade, body_brigade);
if (tmpfile) {
apr_brigade_insert_file(input_brigade, tmpfile, 0, fsize, p);
}
if (apr_table_get(r->subprocess_env, "proxy-sendextracrlf")) {
e = apr_bucket_immortal_create(CRLF_ASCII, 2, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(input_brigade, e);
}
if (tmpfile) {
/* We dropped metadata buckets when spooling to tmpfile,
* terminate with EOS to allow for flushing in a one go.
*/
e = apr_bucket_eos_create(bucket_alloc);
APR_BRIGADE_INSERT_TAIL(input_brigade, e);
}
return OK;
}
PROXY_DECLARE(int) ap_proxy_pass_brigade(apr_bucket_alloc_t *bucket_alloc,
request_rec *r, proxy_conn_rec *p_conn,
conn_rec *origin, apr_bucket_brigade *bb,
int flush)
{
apr_status_t status;
apr_off_t transferred;
if (flush) {
apr_bucket *e = apr_bucket_flush_create(bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb, e);
}
apr_brigade_length(bb, 0, &transferred);
if (transferred != -1)
p_conn->worker->s->transferred += transferred;
status = ap_pass_brigade(origin->output_filters, bb);
/* Cleanup the brigade now to avoid buckets lifetime
* issues in case of error returned below. */
apr_brigade_cleanup(bb);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01084)
"pass request body failed to %pI (%s)",
p_conn->addr, p_conn->hostname);
if (origin->aborted) {
const char *ssl_note;
if (((ssl_note = apr_table_get(origin->notes, "SSL_connect_rv"))
!= NULL) && (strcmp(ssl_note, "err") == 0)) {
return ap_proxyerror(r, HTTP_INTERNAL_SERVER_ERROR,
"Error during SSL Handshake with"
" remote server");
}
return APR_STATUS_IS_TIMEUP(status) ? HTTP_GATEWAY_TIME_OUT : HTTP_BAD_GATEWAY;
}
else {
return HTTP_BAD_REQUEST;
}
}
return OK;
}
/* Fill in unknown schemes from apr_uri_port_of_scheme() */
typedef struct proxy_schemes_t {
const char *name;
apr_port_t default_port;
} proxy_schemes_t ;
static proxy_schemes_t pschemes[] =
{
{"fcgi", 8000},
{"ajp", AJP13_DEF_PORT},
{"scgi", SCGI_DEF_PORT},
{"h2c", DEFAULT_HTTP_PORT},
{"h2", DEFAULT_HTTPS_PORT},
{"ws", DEFAULT_HTTP_PORT},
{"wss", DEFAULT_HTTPS_PORT},
{ NULL, 0xFFFF } /* unknown port */
};
PROXY_DECLARE(apr_port_t) ap_proxy_port_of_scheme(const char *scheme)
{
if (scheme) {
apr_port_t port;
if ((port = apr_uri_port_of_scheme(scheme)) != 0) {
return port;
} else {
proxy_schemes_t *pscheme;
for (pscheme = pschemes; pscheme->name != NULL; ++pscheme) {
if (ap_cstr_casecmp(scheme, pscheme->name) == 0) {
return pscheme->default_port;
}
}
}
}
return 0;
}
static APR_INLINE int ap_filter_should_yield(ap_filter_t *f)
{
return f->c->data_in_output_filters;
}
static APR_INLINE int ap_filter_output_pending(conn_rec *c)
{
ap_filter_t *f = c->output_filters;
while (f->next) {
f = f->next;
}
if (f->frec->filter_func.out_func(f, NULL)) {
return AP_FILTER_ERROR;
}
return c->data_in_output_filters ? OK : DECLINED;
}
PROXY_DECLARE(apr_status_t) ap_proxy_buckets_lifetime_transform(request_rec *r,
apr_bucket_brigade *from,
apr_bucket_brigade *to)
{
apr_bucket *e;
apr_bucket *new;
const char *data;
apr_size_t bytes;
apr_status_t rv = APR_SUCCESS;
apr_bucket_alloc_t *bucket_alloc = to->bucket_alloc;
apr_brigade_cleanup(to);
for (e = APR_BRIGADE_FIRST(from);
e != APR_BRIGADE_SENTINEL(from);
e = APR_BUCKET_NEXT(e)) {
if (!APR_BUCKET_IS_METADATA(e)) {
apr_bucket_read(e, &data, &bytes, APR_BLOCK_READ);
new = apr_bucket_transient_create(data, bytes, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(to, new);
}
else if (APR_BUCKET_IS_FLUSH(e)) {
new = apr_bucket_flush_create(bucket_alloc);
APR_BRIGADE_INSERT_TAIL(to, new);
}
else if (APR_BUCKET_IS_EOS(e)) {
new = apr_bucket_eos_create(bucket_alloc);
APR_BRIGADE_INSERT_TAIL(to, new);
}
else {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(03304)
"Unhandled bucket type of type %s in"
" ap_proxy_buckets_lifetime_transform", e->type->name);
rv = APR_EGENERAL;
}
}
return rv;
}
/* An arbitrary large value to address pathological case where we keep
* reading from one side only, without scheduling the other direction for
* too long. This can happen with large MTU and small read buffers, like
* micro-benchmarking huge files bidirectional transfer with client, proxy
* and backend on localhost for instance. Though we could just ignore the
* case and let the sender stop by itself at some point when/if it needs to
* receive data, or the receiver stop when/if it needs to send...
*/
#define PROXY_TRANSFER_MAX_READS 10000
PROXY_DECLARE(apr_status_t) ap_proxy_transfer_between_connections(
request_rec *r,
conn_rec *c_i,
conn_rec *c_o,
apr_bucket_brigade *bb_i,
apr_bucket_brigade *bb_o,
const char *name,
int *sent,
apr_off_t bsize,
int flags)
{
apr_status_t rv;
int flush_each = 0;
unsigned int num_reads = 0;
#ifdef DEBUGGING
apr_off_t len;
#endif
/*
* Compat: since FLUSH_EACH is default (and zero) for legacy reasons, we
* pretend it's no FLUSH_AFTER nor YIELD_PENDING flags, the latter because
* flushing would defeat the purpose of checking for pending data (hence
* determine whether or not the output chain/stack is full for stopping).
*/
if (!(flags & (AP_PROXY_TRANSFER_FLUSH_AFTER |
AP_PROXY_TRANSFER_YIELD_PENDING))) {
flush_each = 1;
}
for (;;) {
apr_brigade_cleanup(bb_i);
rv = ap_get_brigade(c_i->input_filters, bb_i, AP_MODE_READBYTES,
APR_NONBLOCK_READ, bsize);
if (rv != APR_SUCCESS) {
if (!APR_STATUS_IS_EAGAIN(rv) && !APR_STATUS_IS_EOF(rv)) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rv, r, APLOGNO(03308)
"ap_proxy_transfer_between_connections: "
"error on %s - ap_get_brigade",
name);
if (rv == APR_INCOMPLETE) {
/* Don't return APR_INCOMPLETE, it'd mean "should yield"
* for the caller, while it means "incomplete body" here
* from ap_http_filter(), which is an error.
*/
rv = APR_EGENERAL;
}
}
break;
}
if (c_o->aborted) {
apr_brigade_cleanup(bb_i);
flags &= ~AP_PROXY_TRANSFER_FLUSH_AFTER;
rv = APR_EPIPE;
break;
}
if (APR_BRIGADE_EMPTY(bb_i)) {
break;
}
#ifdef DEBUGGING
len = -1;
apr_brigade_length(bb_i, 0, &len);
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03306)
"ap_proxy_transfer_between_connections: "
"read %" APR_OFF_T_FMT
" bytes from %s", len, name);
#endif
if (sent) {
*sent = 1;
}
ap_proxy_buckets_lifetime_transform(r, bb_i, bb_o);
if (flush_each) {
apr_bucket *b;
/*
* Do not use ap_fflush here since this would cause the flush
* bucket to be sent in a separate brigade afterwards which
* causes some filters to set aside the buckets from the first
* brigade and process them when FLUSH arrives in the second
* brigade. As set asides of our transformed buckets involve
* memory copying we try to avoid this. If we have the flush
* bucket in the first brigade they directly process the
* buckets without setting them aside.
*/
b = apr_bucket_flush_create(bb_o->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb_o, b);
}
rv = ap_pass_brigade(c_o->output_filters, bb_o);
apr_brigade_cleanup(bb_o);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(03307)
"ap_proxy_transfer_between_connections: "
"error on %s - ap_pass_brigade",
name);
flags &= ~AP_PROXY_TRANSFER_FLUSH_AFTER;
break;
}
/* Yield if the output filters stack is full? This is to avoid
* blocking and give the caller a chance to POLLOUT async.
*/
if ((flags & AP_PROXY_TRANSFER_YIELD_PENDING)
&& ap_filter_should_yield(c_o->output_filters)) {
int rc = ap_filter_output_pending(c_o);
if (rc == OK) {
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
"ap_proxy_transfer_between_connections: "
"yield (output pending)");
rv = APR_INCOMPLETE;
break;
}
if (rc != DECLINED) {
rv = AP_FILTER_ERROR;
break;
}
}
/* Yield if we keep hold of the thread for too long? This gives
* the caller a chance to schedule the other direction too.
*/
if ((flags & AP_PROXY_TRANSFER_YIELD_MAX_READS)
&& ++num_reads > PROXY_TRANSFER_MAX_READS) {
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
"ap_proxy_transfer_between_connections: "
"yield (max reads)");
rv = APR_SUCCESS;
break;
}
}
if (flags & AP_PROXY_TRANSFER_FLUSH_AFTER) {
ap_fflush(c_o->output_filters, bb_o);
apr_brigade_cleanup(bb_o);
}
apr_brigade_cleanup(bb_i);
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, rv, r,
"ap_proxy_transfer_between_connections complete (%s %pI)",
(c_i == r->connection) ? "to" : "from",
(c_i == r->connection) ? c_o->client_addr
: c_i->client_addr);
if (APR_STATUS_IS_EAGAIN(rv)) {
rv = APR_SUCCESS;
}
return rv;
}
struct proxy_tunnel_conn {
/* the other side of the tunnel */
struct proxy_tunnel_conn *other;
conn_rec *c;
const char *name;
apr_pollfd_t *pfd;
apr_bucket_brigade *bb;
unsigned int down_in:1,
down_out:1;
};
PROXY_DECLARE(apr_status_t) ap_proxy_tunnel_create(proxy_tunnel_rec **ptunnel,
request_rec *r, conn_rec *c_o,
const char *scheme)
{
apr_status_t rv;
conn_rec *c_i = r->connection;
apr_interval_time_t client_timeout = -1, origin_timeout = -1;
proxy_tunnel_rec *tunnel;
*ptunnel = NULL;
tunnel = apr_pcalloc(r->pool, sizeof(*tunnel));
rv = apr_pollset_create(&tunnel->pollset, 2, r->pool, APR_POLLSET_NOCOPY);
if (rv != APR_SUCCESS) {
return rv;
}
tunnel->r = r;
tunnel->scheme = apr_pstrdup(r->pool, scheme);
tunnel->client = apr_pcalloc(r->pool, sizeof(struct proxy_tunnel_conn));
tunnel->origin = apr_pcalloc(r->pool, sizeof(struct proxy_tunnel_conn));
tunnel->pfds = apr_array_make(r->pool, 2, sizeof(apr_pollfd_t));
tunnel->read_buf_size = ap_get_read_buf_size(r);
tunnel->client->other = tunnel->origin;
tunnel->origin->other = tunnel->client;
tunnel->timeout = -1;
tunnel->client->c = c_i;
tunnel->client->name = "client";
tunnel->client->bb = apr_brigade_create(c_i->pool, c_i->bucket_alloc);
tunnel->client->pfd = &APR_ARRAY_PUSH(tunnel->pfds, apr_pollfd_t);
tunnel->client->pfd->p = r->pool;
tunnel->client->pfd->desc_type = APR_NO_DESC;
rv = ap_get_pollfd_from_conn(tunnel->client->c,
tunnel->client->pfd, &client_timeout);
if (rv != APR_SUCCESS) {
return rv;
}
tunnel->client->pfd->client_data = tunnel->client;
if (tunnel->client->pfd->desc_type == APR_POLL_SOCKET) {
apr_socket_opt_set(tunnel->client->pfd->desc.s, APR_SO_NONBLOCK, 1);
}
tunnel->origin->c = c_o;
tunnel->origin->name = "origin";
tunnel->origin->bb = apr_brigade_create(c_o->pool, c_o->bucket_alloc);
tunnel->origin->pfd = &APR_ARRAY_PUSH(tunnel->pfds, apr_pollfd_t);
tunnel->origin->pfd->p = r->pool;
tunnel->origin->pfd->desc_type = APR_POLL_SOCKET;
tunnel->origin->pfd->desc.s = ap_get_conn_socket(c_o);
tunnel->origin->pfd->client_data = tunnel->origin;
apr_socket_timeout_get(tunnel->origin->pfd->desc.s, &origin_timeout);
apr_socket_opt_set(tunnel->origin->pfd->desc.s, APR_SO_NONBLOCK, 1);
/* Defaults to the largest timeout of both connections */
tunnel->timeout = (client_timeout >= 0 && client_timeout > origin_timeout ?
client_timeout : origin_timeout);
/* No coalescing filters */
ap_remove_output_filter_byhandle(c_i->output_filters,
"SSL/TLS Coalescing Filter");
ap_remove_output_filter_byhandle(c_o->output_filters,
"SSL/TLS Coalescing Filter");
/* Bidirectional non-HTTP stream will confuse mod_reqtimeoout */
ap_remove_input_filter_byhandle(c_i->input_filters, "reqtimeout");
/* The input/output filter stacks should contain connection filters only */
r->input_filters = r->proto_input_filters = c_i->input_filters;
r->output_filters = r->proto_output_filters = c_i->output_filters;
/* Won't be reused after tunneling */
c_i->keepalive = AP_CONN_CLOSE;
c_o->keepalive = AP_CONN_CLOSE;
/* Disable half-close forwarding for this request? */
if (apr_table_get(r->subprocess_env, "proxy-nohalfclose")) {
tunnel->nohalfclose = 1;
}
if (tunnel->client->pfd->desc_type == APR_POLL_SOCKET) {
/* Both ends are sockets, the poll strategy is:
* - poll both sides POLLOUT
* - when one side is writable, remove the POLLOUT
* and add POLLIN to the other side.
* - tunnel arriving data, remove POLLIN from the source
* again and add POLLOUT to the receiving side
* - on EOF on read, remove the POLLIN from that side
* Repeat until both sides are down */
tunnel->client->pfd->reqevents = APR_POLLOUT | APR_POLLERR;
tunnel->origin->pfd->reqevents = APR_POLLOUT | APR_POLLERR;
if ((rv = apr_pollset_add(tunnel->pollset, tunnel->origin->pfd)) ||
(rv = apr_pollset_add(tunnel->pollset, tunnel->client->pfd))) {
return rv;
}
}
else if (tunnel->client->pfd->desc_type == APR_POLL_FILE) {
/* Input is a PIPE fd, the poll strategy is:
* - always POLLIN on origin
* - use socket strategy described above for client only
* otherwise the same
*/
tunnel->client->pfd->reqevents = 0;
tunnel->origin->pfd->reqevents = APR_POLLIN | APR_POLLHUP |
APR_POLLOUT | APR_POLLERR;
if ((rv = apr_pollset_add(tunnel->pollset, tunnel->origin->pfd))) {
return rv;
}
}
else {
/* input is already closed, unsual, but we know nothing about
* the tunneled protocol. */
tunnel->client->down_in = 1;
tunnel->origin->pfd->reqevents = APR_POLLIN | APR_POLLHUP;
if ((rv = apr_pollset_add(tunnel->pollset, tunnel->origin->pfd))) {
return rv;
}
}
*ptunnel = tunnel;
return APR_SUCCESS;
}
static void add_pollset(apr_pollset_t *pollset, apr_pollfd_t *pfd,
apr_int16_t events)
{
apr_status_t rv;
AP_DEBUG_ASSERT((pfd->reqevents & events) == 0);
if (pfd->reqevents) {
rv = apr_pollset_remove(pollset, pfd);
if (rv != APR_SUCCESS) {
AP_DEBUG_ASSERT(1);
}
}
if (events & APR_POLLIN) {
events |= APR_POLLHUP;
}
pfd->reqevents |= events | APR_POLLERR;
rv = apr_pollset_add(pollset, pfd);
if (rv != APR_SUCCESS) {
AP_DEBUG_ASSERT(1);
}
}
static void del_pollset(apr_pollset_t *pollset, apr_pollfd_t *pfd,
apr_int16_t events)
{
apr_status_t rv;
AP_DEBUG_ASSERT((pfd->reqevents & events) != 0);
rv = apr_pollset_remove(pollset, pfd);
if (rv != APR_SUCCESS) {
AP_DEBUG_ASSERT(0);
return;
}
if (events & APR_POLLIN) {
events |= APR_POLLHUP;
}
if (pfd->reqevents & ~(events | APR_POLLERR)) {
pfd->reqevents &= ~events;
rv = apr_pollset_add(pollset, pfd);
if (rv != APR_SUCCESS) {
AP_DEBUG_ASSERT(0);
return;
}
}
else {
pfd->reqevents = 0;
}
}
static int proxy_tunnel_forward(proxy_tunnel_rec *tunnel,
struct proxy_tunnel_conn *in)
{
struct proxy_tunnel_conn *out = in->other;
apr_status_t rv;
int sent = 0;
ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, tunnel->r,
"proxy: %s: %s input ready",
tunnel->scheme, in->name);
rv = ap_proxy_transfer_between_connections(tunnel->r,
in->c, out->c,
in->bb, out->bb,
in->name, &sent,
tunnel->read_buf_size,
AP_PROXY_TRANSFER_YIELD_PENDING |
AP_PROXY_TRANSFER_YIELD_MAX_READS);
if (sent && out == tunnel->client) {
tunnel->replied = 1;
}
if (rv != APR_SUCCESS) {
if (APR_STATUS_IS_INCOMPLETE(rv)) {
/* Pause POLLIN while waiting for POLLOUT on the other
* side, hence avoid filling the output filters even
* more to avoid blocking there.
*/
ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, tunnel->r,
"proxy: %s: %s wait writable",
tunnel->scheme, out->name);
}
else if (APR_STATUS_IS_EOF(rv)) {
/* Stop POLLIN and wait for POLLOUT (flush) on the
* other side to shut it down.
*/
ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, tunnel->r,
"proxy: %s: %s read shutdown",
tunnel->scheme, in->name);
if (tunnel->nohalfclose) {
/* No half-close forwarding, we are done both ways as
* soon as one side shuts down.
*/
return DONE;
}
in->down_in = 1;
}
else {
/* Real failure, bail out */
return HTTP_INTERNAL_SERVER_ERROR;
}
del_pollset(tunnel->pollset, in->pfd, APR_POLLIN);
if (out->pfd->desc_type == APR_POLL_SOCKET) {
/* if the output is a SOCKET, we can stop polling the input
* until the output signals POLLOUT again. */
add_pollset(tunnel->pollset, out->pfd, APR_POLLOUT);
}
else {
/* We can't use POLLOUT in this direction for the only
* APR_POLL_FILE case we have so far (mod_h2's "signal" pipe),
* we assume that the client's ouput filters chain will block/flush
* if necessary (i.e. no pending data), hence that the origin
* is EOF when reaching here. This direction is over. */
ap_assert(in->down_in && APR_STATUS_IS_EOF(rv));
ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, tunnel->r,
"proxy: %s: %s write shutdown",
tunnel->scheme, out->name);
out->down_out = 1;
}
}
return OK;
}
PROXY_DECLARE(int) ap_proxy_tunnel_run(proxy_tunnel_rec *tunnel)
{
int status = OK, rc;
request_rec *r = tunnel->r;
apr_pollset_t *pollset = tunnel->pollset;
struct proxy_tunnel_conn *client = tunnel->client,
*origin = tunnel->origin;
apr_interval_time_t timeout = tunnel->timeout >= 0 ? tunnel->timeout : -1;
const char *scheme = tunnel->scheme;
apr_status_t rv;
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(10212)
"proxy: %s: tunnel running (timeout %lf)",
scheme, timeout >= 0 ? (double)timeout / APR_USEC_PER_SEC
: (double)-1.0);
/* Loop until both directions of the connection are closed,
* or a failure occurs.
*/
do {
const apr_pollfd_t *results;
apr_int32_t nresults, i;
ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r,
"proxy: %s: polling (client=%hx, origin=%hx)",
scheme, client->pfd->reqevents, origin->pfd->reqevents);
do {
rv = apr_pollset_poll(pollset, timeout, &nresults, &results);
} while (APR_STATUS_IS_EINTR(rv));
if (rv != APR_SUCCESS) {
if (APR_STATUS_IS_TIMEUP(rv)) {
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, APLOGNO(10213)
"proxy: %s: polling timed out "
"(client=%hx, origin=%hx)",
scheme, client->pfd->reqevents,
origin->pfd->reqevents);
status = HTTP_GATEWAY_TIME_OUT;
}
else {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(10214)
"proxy: %s: polling failed", scheme);
status = HTTP_INTERNAL_SERVER_ERROR;
}
goto done;
}
ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r, APLOGNO(10215)
"proxy: %s: woken up, %i result(s)", scheme, nresults);
for (i = 0; i < nresults; i++) {
const apr_pollfd_t *pfd = &results[i];
struct proxy_tunnel_conn *tc = pfd->client_data;
ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r,
"proxy: %s: #%i: %s: %hx/%hx", scheme, i,
tc->name, pfd->rtnevents, tc->pfd->reqevents);
/* sanity check */
if (pfd->desc.s != client->pfd->desc.s
&& pfd->desc.s != origin->pfd->desc.s) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10222)
"proxy: %s: unknown socket in pollset", scheme);
status = HTTP_INTERNAL_SERVER_ERROR;
goto done;
}
if (!(pfd->rtnevents & (APR_POLLIN | APR_POLLOUT |
APR_POLLHUP | APR_POLLERR))) {
/* this catches POLLNVAL etc.. */
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10220)
"proxy: %s: polling events error (%x)",
scheme, pfd->rtnevents);
status = HTTP_INTERNAL_SERVER_ERROR;
goto done;
}
/* We want to write if we asked for POLLOUT and got:
* - POLLOUT: the socket is ready for write;
* - !POLLIN: the socket is in error state (POLLERR) so we let
* the user know by failing the write and log, OR the socket
* is shutdown for read already (POLLHUP) so we have to
* shutdown for write.
*/
if ((tc->pfd->reqevents & APR_POLLOUT)
&& ((pfd->rtnevents & APR_POLLOUT)
|| !(tc->pfd->reqevents & APR_POLLIN)
|| !(pfd->rtnevents & (APR_POLLIN | APR_POLLHUP)))) {
struct proxy_tunnel_conn *out = tc, *in = tc->other;
ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r,
"proxy: %s: %s output ready",
scheme, out->name);
rc = ap_filter_output_pending(out->c);
if (rc == OK) {
/* Keep polling out (only) */
continue;
}
if (rc != DECLINED) {
/* Real failure, bail out */
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10221)
"proxy: %s: %s flushing failed (%i)",
scheme, out->name, rc);
status = rc;
goto done;
}
/* No more pending data. If the other side is not readable
* anymore it's time to shutdown for write (this direction
* is over). Otherwise back to normal business.
*/
del_pollset(pollset, out->pfd, APR_POLLOUT);
if (in->down_in) {
ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r,
"proxy: %s: %s write shutdown",
scheme, out->name);
apr_socket_shutdown(out->pfd->desc.s, 1);
out->down_out = 1;
}
else {
ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, r,
"proxy: %s: %s resume writable",
scheme, out->name);
add_pollset(pollset, in->pfd, APR_POLLIN);
/* Flush any pending input data now, we don't know when
* the next POLLIN will trigger and retaining data might
* deadlock the underlying protocol. We don't check for
* pending data first with ap_filter_input_pending() since
* the read from proxy_tunnel_forward() is nonblocking
* anyway and returning OK if there's no data.
*/
rc = proxy_tunnel_forward(tunnel, in);
if (rc != OK) {
status = rc;
goto done;
}
}
}
/* We want to read if we asked for POLLIN|HUP and got:
* - POLLIN|HUP: the socket is ready for read or EOF (POLLHUP);
* - !POLLOUT: the socket is in error state (POLLERR) so we let
* the user know by failing the read and log.
*/
if ((tc->pfd->reqevents & APR_POLLIN)
&& ((pfd->rtnevents & (APR_POLLIN | APR_POLLHUP))
|| !(pfd->rtnevents & APR_POLLOUT))) {
rc = proxy_tunnel_forward(tunnel, tc);
if (rc != OK) {
status = rc;
goto done;
}
}
}
} while (!client->down_out || !origin->down_out);
done:
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(10223)
"proxy: %s: tunneling returns (%i)", scheme, status);
if (status == DONE) {
status = OK;
}
return status;
}
PROXY_DECLARE (const char *) ap_proxy_show_hcmethod(hcmethod_t method)
{
proxy_hcmethods_t *m = proxy_hcmethods;
for (; m->name; m++) {
if (m->method == method) {
return m->name;
}
}
return "???";
}
void proxy_util_register_hooks(apr_pool_t *p)
{
APR_REGISTER_OPTIONAL_FN(ap_proxy_retry_worker);
APR_REGISTER_OPTIONAL_FN(ap_proxy_clear_connection);
APR_REGISTER_OPTIONAL_FN(proxy_balancer_get_best_worker);
{
apr_time_t *start_time = ap_retained_data_get("proxy_start_time");
if (start_time == NULL) {
start_time = ap_retained_data_create("proxy_start_time",
sizeof(*start_time));
*start_time = apr_time_now();
}
proxy_start_time = start_time;
}
}
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