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gbucchino 2026-04-29 16:16:36 +02:00
parent 58d7f47df9
commit 7ea9ce635c
8 changed files with 0 additions and 398 deletions
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tests/bfd_file
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tests/bfd_file.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <bfd.h>
#include <dis-asm.h>
// apt install binutils binutils-dev
// https://sourceware.org/binutils/docs/bfd/BFD-Index.html
// gcc bfd_file.c -o bfd_file -lopcodes -lbfd && ./bfd_file
// https://ftp.gnu.org/old-gnu/Manuals/bfd-2.9.1/html_chapter/bfd_1.html
static bfd_boolean disassemble;
struct data {
char *data;
};
static int dump_asm(void *stream, const char *fmt, ...){
struct data *sData = (struct data*)stream;
va_list args;
va_start(args, fmt);
char str[64];
vsprintf(str, fmt, args);
//vsnprintf(str, sizeof(str), fmt, args);
//asprintf(str, "%s\n", args);
va_end(args);
char tmp[64];
memset(tmp, 0, 64);
//printf("%d\n", sData->offset);
if (strlen(sData->data) > 0){
memcpy(tmp, sData->data, 64);
//printf("TMP: %s %d\n", tmp, strlen(tmp));
strcat(tmp, str);
}
else
memcpy(tmp, str, strlen(str));
memcpy(sData->data, tmp, 64);
}
static int disass(){
struct disassemble_info disasm_info;
struct data *sData = (struct data*)malloc(sizeof(struct data));
sData->data = (char*)malloc(64);
//char filename[256] = "/home/geoffrey/Documents/GIT/cybersecurity/forensic/disassembly/call_function";
char filename[256];
bfd *abfd = NULL;
struct stat s_stat;
int fd_r;
pid_t pid = getpid();
sprintf(filename, "/proc/%d/exe", pid);
printf("%s\n", filename);
if ((fd_r = open(filename, O_RDONLY)) < 0){
printf("Failed to read file\n");
return -1;
}
fstat(fd_r, &s_stat);
printf("Len: %d\n", s_stat.st_size);
close(fd_r);
bfd_init();
abfd = bfd_openr(filename, NULL);
//set_default_bfd_target();
if (abfd == NULL){
printf("Cannot read bfd file\n");
free(sData->data);
free(sData);
return -1;
}
// Defined in https://github.com/redox-os/binutils-gdb/blob/master/include/dis-asm.h
//init_disassemble_info (&disasm_info, stdout, (fprintf_ftype) fprintf);
init_disassemble_info (&disasm_info, sData, dump_asm);
disasm_info.arch = bfd_get_arch(abfd);
disasm_info.mach = bfd_get_mach(abfd);
/*disasm_info.arch = bfd_arch_i386;
disasm_info.mach = bfd_mach_x86_64;
disasm_info.read_memory_func = buffer_read_memory;
disasm_info.buffer = code;
disasm_info.buffer_vma = 0;
disasm_info.buffer_length = length;*/
disassemble_init_for_target(&disasm_info);
printf("%d\n", bfd_get_arch(abfd));
printf("%d\n", bfd_get_mach(abfd));
printf("%s\n", bfd_printable_arch_mach(
bfd_get_arch(abfd),
bfd_get_mach(abfd)));
//disassembler_ftype disas = disassembler(abfd);
disassembler_ftype disas = disassembler(bfd_arch_i386, false, bfd_mach_x86_64, NULL);
if (!disas){
printf("Can't disassemble\n");
perror("disassembler()");
return -1;
}
size_t i = 0;
size_t length = s_stat.st_size;
while (i < length){
size_t octets = disas(i, &disasm_info);
printf("%s\n", sData->data);
i += octets;
memset(sData->data, 0, 64);
};
free(sData->data);
free(sData);
bfd_close(abfd);
return 0;
}
int main(void){
disass();
return 0;
}

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tests/test_bfd
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tests/test_bfd.c
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#include <stdio.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <dis-asm.h>
#include "bfd.h"
// apt install binutils binutils-dev
// gcc test_bfd.c -o test_bfd -lopcodes && ./test_bfd
// https://ftp.gnu.org/old-gnu/Manuals/bfd-2.9.1/html_chapter/bfd_1.html
static bfd_boolean disassemble;
struct data {
char *data;
};
static int dump_asm(void *stream, const char *fmt, ...){
struct data *sData = (struct data*)stream;
va_list args;
va_start(args, fmt);
char str[64];
vsprintf(str, fmt, args);
//vsnprintf(str, sizeof(str), fmt, args);
//asprintf(str, "%s\n", args);
va_end(args);
char tmp[64];
memset(tmp, 0, 64);
//printf("%d\n", sData->offset);
if (strlen(sData->data) > 0){
memcpy(tmp, sData->data, 64);
//printf("TMP: %s %d\n", tmp, strlen(tmp));
strcat(tmp, str);
}
else
memcpy(tmp, str, strlen(str));
memcpy(sData->data, tmp, 64);
}
static int disas(unsigned char *code, size_t length){
struct disassemble_info disasm_info;
struct data *sData = (struct data*)malloc(sizeof(struct data));
sData->data = (char*)malloc(64);
disassemble = TRUE;
bfd_init();
//set_default_bfd_target();
// Defined in https://github.com/redox-os/binutils-gdb/blob/master/include/dis-asm.h
//init_disassemble_info (&disasm_info, stdout, (fprintf_ftype) fprintf);
init_disassemble_info (&disasm_info, sData, dump_asm);
disasm_info.arch = bfd_arch_i386;
disasm_info.mach = bfd_mach_x86_64;
disasm_info.read_memory_func = buffer_read_memory;
disasm_info.buffer = code;
disasm_info.buffer_vma = 0;
disasm_info.buffer_length = length;
disassemble_init_for_target(&disasm_info);
disassembler_ftype disas;
disas = disassembler(bfd_arch_i386, false, bfd_mach_x86_64, NULL);
if (!disas){
printf("Can't disassemble\n");
return -1;
}
size_t i = 0;
while (i < length){
size_t octets = disas(i, &disasm_info);
printf("%s\n", sData->data);
i += octets;
memset(sData->data, 0, 64);
};
free(sData->data);
free(sData);
return 0;
}
int main(void){
unsigned char code[] = {
0x55, 0x48, 0x89, 0xE5, 0x48, 0x83, 0xEC, 0x20, 0x89, 0x7D,
0xEC, 0x48, 0x8D, 0x4D, 0xF4, 0x8B, 0x45, 0xEC, 0xBA, 0x04,
0x00, 0x00, 0x00, 0x48, 0x89, 0xCE, 0x89, 0xC7, 0xE8, 0x42,
0xFC, 0xFF, 0xFF, 0x48, 0x89, 0x45, 0xF8, 0x48, 0x83, 0x7D,
0xF8, 0xFF, 0x75, 0x07, 0xB8, 0xFF, 0xFF, 0xFF, 0xFF, 0xEB,
0x2C, 0x0F, 0xB6, 0x45, 0xF4, 0x3C, 0x7F, 0x75, 0x1F, 0x0F,
0xB6, 0x45, 0xF5, 0x3C, 0x45, 0x75, 0x17, 0x0F, 0xB6, 0x45,
0xF6, 0x3C, 0x4C, 0x75, 0x0F, 0x0F, 0xB6, 0x45, 0xF7, 0x3C,
0x46, 0x75, 0x07, 0xB8, 0x01, 0x00, 0x00, 0x00, 0xEB, 0x05,
0xB8, 0x00, 0x00, 0x00, 0x00, 0xC9, 0xC3
};
size_t length = sizeof(code);
disas(code, length);
return 0;
}

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tests/test_bfd.c_bck
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#include <stdio.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <dis-asm.h>
#include "bfd.h"
// apt install binutils binutils-dev
// gcc test_bfd.c -o test_bfd -lopcodes && ./test_bfd
// https://ftp.gnu.org/old-gnu/Manuals/bfd-2.9.1/html_chapter/bfd_1.html
static bfd_boolean disassemble;
struct data {
char **data;
size_t offset;
size_t index;
};
static int dump_asm(void *stream, const char *fmt, ...){
struct data *sData = (struct data*)stream;
va_list args;
va_start(args, fmt);
char str[64];
vsprintf(str, fmt, args);
//vsnprintf(str, sizeof(str), fmt, args);
//asprintf(str, "%s\n", args);
va_end(args);
//printf("%s\n", str);
sData->offset = strlen(str);
int index = sData->index;
char tmp[64];
memset(tmp, 0, 64);
//printf("%d\n", sData->offset);
if (strlen(sData->data[index]) > 0){
memcpy(tmp, sData->data[index], 64);
//printf("TMP: %s %d\n", tmp, strlen(tmp));
strcat(tmp, str);
}
else
memcpy(tmp, str, strlen(str));
memcpy(sData->data[index], tmp, 64);
}
static int disas(unsigned char *code, size_t length){
struct disassemble_info disasm_info;
struct data *sData = (struct data*)malloc(sizeof(struct data));
sData->data = (char**)malloc(sizeof(char *) * 64);
for (int i = 0; i < 64; i++){
sData->data[i] = (char*)malloc(64);
}
for (int i = 0; i < 64; i++)
memset(sData->data[i], 0, 64);
sData->offset = 0;
sData->index = 0;
disassemble = TRUE;
bfd_init();
//set_default_bfd_target();
// Defined in https://github.com/redox-os/binutils-gdb/blob/master/include/dis-asm.h
//init_disassemble_info (&disasm_info, stdout, (fprintf_ftype) fprintf);
init_disassemble_info (&disasm_info, sData, dump_asm);
disasm_info.arch = bfd_arch_i386;
disasm_info.mach = bfd_mach_x86_64;
disasm_info.read_memory_func = buffer_read_memory;
disasm_info.buffer = code;
disasm_info.buffer_vma = 0;
disasm_info.buffer_length = length;
disassemble_init_for_target(&disasm_info);
disassembler_ftype disas;
disas = disassembler(bfd_arch_i386, false, bfd_mach_x86_64, NULL);
if (!disas){
printf("Can't disassemble\n");
return -1;
}
size_t i = 0;
while (i < length){
size_t octets = disas(i, &disasm_info);
printf("%s\n", sData->data[sData->index]);
//disasm_info.stream = stdout;
//disasm_info.stream = (void*)sData;
//struct data *sData = (struct data*)disasm_info.stream;
//disasm_info.fprintf_func = (fprintf_ftype)fprintf;
//printf("%ld\n", sData->index);
i += octets;
sData->index += 1;
};
for (int i = 0; i < 64; i++)
free(sData->data[i]);
free(sData->data);
free(sData);
return 0;
}
int main(void){
unsigned char code[] = {
0x55, 0x48, 0x89, 0xE5, 0x48, 0x83, 0xEC, 0x20, 0x89, 0x7D,
0xEC, 0x48, 0x8D, 0x4D, 0xF4, 0x8B, 0x45, 0xEC, 0xBA, 0x04,
0x00, 0x00, 0x00, 0x48, 0x89, 0xCE, 0x89, 0xC7, 0xE8, 0x42,
0xFC, 0xFF, 0xFF, 0x48, 0x89, 0x45, 0xF8, 0x48, 0x83, 0x7D,
0xF8, 0xFF, 0x75, 0x07, 0xB8, 0xFF, 0xFF, 0xFF, 0xFF, 0xEB,
0x2C, 0x0F, 0xB6, 0x45, 0xF4, 0x3C, 0x7F, 0x75, 0x1F, 0x0F,
0xB6, 0x45, 0xF5, 0x3C, 0x45, 0x75, 0x17, 0x0F, 0xB6, 0x45,
0xF6, 0x3C, 0x4C, 0x75, 0x0F, 0x0F, 0xB6, 0x45, 0xF7, 0x3C,
0x46, 0x75, 0x07, 0xB8, 0x01, 0x00, 0x00, 0x00, 0xEB, 0x05,
0xB8, 0x00, 0x00, 0x00, 0x00, 0xC9, 0xC3
};
size_t length = sizeof(code);
disas(code, length);
return 0;
}

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tests/test_buffer.c
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#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
struct test{
char b1;
char b2;
char b3;
};
int main(void){
char buf[9];
int fd_r;
//struct test *s_test = malloc(sizeof(struct test));
struct test *s_test = NULL;
memset(buf, 0, 9);
if ((fd_r = open("test.txt", O_RDONLY)) == -1){
exit(-1);
}
read(fd_r, buf, 9);
for (int i = 0; i < 9; i++){
printf("%c", buf[i]);
}
printf("\n");
s_test = (struct test*)buf + 2;
printf("%c %c %c\n", s_test->b1, s_test->b2, s_test->b3);
close(fd_r);
//free(s_test);
}

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tests/test_realloc
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tests/test_realloc.c
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#include <stdio.h>
#include <stdlib.h>
#define TEST 5
int main(void){
int *foo = (int*)malloc(sizeof(int) * TEST);
for(int i = 0; i < TEST; i++)
foo[i] = i;
for(int i = 0; i < TEST; i++)
printf("%d\n", foo[i]);
printf("\n");
foo = (int *)realloc(foo, sizeof(int) * (TEST + TEST));
for(int i = TEST; i < TEST + TEST; i++)
foo[i] = i + 10;
for(int i = 0; i < TEST + TEST; i++)
printf("%d\n", foo[i]);
return 0;
}