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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
#include <sys/types.h>
#include "module.h"
#include "arch.h"
#define NOTFOUND (size_t)(-1)
#define PROCMAPS_LINE_MAX_LENGTH (PATH_MAX + 100)
static void* strtoptr(pid_t pid, const char* nptr, char** endptr, int base)
{
unsigned char bits = getProcessBits(pid);
if (bits == 64)
return (void*)strtoull(nptr, endptr, base);
else if (bits == 32)
return (void*)strtoul(nptr, endptr, base);
return NULL;
}
static size_t find(const char* a, const char* b, uintptr_t offset)
{
const char* pos = a + offset;
while (*pos && strncmp(pos, b, strlen(b)))
++pos;
if (!*pos)
return NOTFOUND;
return (size_t)(pos - a);
}
static size_t rfind(const char* a, const char* b, size_t offset)
{
const char* pos = a + (strlen(a) - strlen(b) - offset);
while (a <= pos && strncmp(pos, b, strlen(b)))
--pos;
if (pos < a)
return NOTFOUND;
return (size_t)(pos - a);
}
static char* substr(const char* str, size_t pos, size_t len)
{
str = str + pos;
if (len == NOTFOUND)
len = strlen(str);
char* buf = malloc(len+1);
strncpy(buf, str, len);
buf[len] = '\0';
return buf;
}
struct module_s getModule(pid_t pid, const char* module_name)
{
struct module_s mod = {0};
char maps_file_path[PATH_MAX];
snprintf(maps_file_path, sizeof(maps_file_path), "/proc/%i/maps", pid);
printf("[?] Maps file path: %s\n", maps_file_path);
FILE* maps_file_fs = fopen(maps_file_path, "rb");
if (!maps_file_fs) return mod;
errno = 0;
char maps_file[PROCMAPS_LINE_MAX_LENGTH];
while( !feof(maps_file_fs) ){
if (fgets(maps_file, sizeof(maps_file), maps_file_fs) == NULL)
{
if (errno != 0)
printf("[?] fgets failed, %s\n",strerror(errno));
return mod;
}
size_t module_path_pos = 0;
size_t module_path_end = 0;
//Get the first slash in the line of the module name
module_path_pos = find(maps_file, module_name, 0);
if (module_path_pos == NOTFOUND)
continue;
module_path_pos = find(maps_file, "/", 0);
//Get the end of the line of the module name
module_path_end = find(maps_file, "\n", module_path_pos);
if(module_path_pos == NOTFOUND || module_path_end == NOTFOUND) continue;
//Module path substring
char* module_path_str = substr(maps_file, module_path_pos, module_path_end - module_path_pos);
printf("[?] Module path string: %s\n", module_path_str);
//--- Module name
char* module_name_str = substr(module_path_str,
rfind(module_path_str, "/", 0) + 1, //Substring from the last '/' to the end of the string
NOTFOUND
);
printf("[?] Module name: %s\n", module_name_str);
//--- Base Address
size_t base_address_pos = rfind(maps_file, "\n", module_path_pos) + 1;
size_t base_address_end = find(maps_file, "-", base_address_pos);
if(base_address_pos == NOTFOUND || base_address_end == NOTFOUND) continue;
char* base_address_str = substr(maps_file, base_address_pos, base_address_end - base_address_pos);
void* base_address = (void*)strtoptr(pid, base_address_str, NULL, 16);;
if (!base_address) return mod;
printf("[?] Base Address: %p\n", base_address);
//--- End Address
size_t end_address_pos;
size_t end_address_end;
char* end_address_str;
void* end_address;
//Get end address pos
end_address_pos = rfind(maps_file, module_path_str, 0);
end_address_pos = rfind(maps_file, "\n", end_address_pos) + 1;
end_address_pos = find(maps_file, "-", end_address_pos) + 1;
//Find first space from end_address_pos
end_address_end = find(maps_file, " ", end_address_pos);
if(end_address_pos == NOTFOUND || end_address_end == NOTFOUND) continue;
//End address substring
end_address_str = substr(maps_file, end_address_pos, end_address_end - end_address_pos);
end_address = (void*)strtoptr(pid, end_address_str, NULL, 16);
free(end_address_str);
printf("[?] End Address: %p\n", end_address);
//--- Module size
uintptr_t module_size = (uintptr_t)end_address - (uintptr_t)base_address;
printf("[?] Module size: 0x%lx\n", module_size);
mod.name = module_name_str;
mod.path = module_path_str;
mod.base = base_address;
mod.size = module_size;
mod.end = end_address;
break;
}
fclose(maps_file_fs);
maps_file_fs = NULL;
return mod;
}
void freeModule(struct module_s* mod)
{
free(mod->name);
free(mod->path);
}
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