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/*
* Copyright (C) 2017 Madura A. (madura.x86@gmail.com)
*
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#define MAX_MATCHES 32
#define MAX_ARGS 1024
#define MAX_ARGS_LEN 4096
static void loader_main() __attribute__((constructor));
char cmdline[MAX_ARGS_LEN];
char *args[MAX_ARGS];
char loader[] = "firejail";
char confFile[256];
char *names[MAX_MATCHES];
#ifdef DEBUG
#define DBG printf
#else
#define DBG
#endif
void remove_trailing_spaces(char *str)
{
while (!isspace(*str))
{
str++;
}
while (*str != '\0')
{
*str = '\0';
str++;
}
}
void read_cmdline()
{
int fd = open("/proc/self/cmdline", O_RDONLY);
ssize_t ret = 0, total = 0;
char* wcmdbuf = cmdline;
while ((ret = read(fd, wcmdbuf, 1)) != 0)
{
wcmdbuf++;
total += ret;
if (total > MAX_ARGS_LEN)
{
printf("Not enough memory\n");
close(fd);
return ;
}
}
close(fd);
}
void make_args()
{
int cI = 0, argI=0;
char* argstart = &cmdline[0];
for (;cI<MAX_ARGS_LEN;cI++)
{
if (cmdline[cI] == '\0')
{
args[argI]= argstart;
argstart = &cmdline[cI+1];
argI++;
if (*argstart == '\0')
{
break;
}
}
}
args[argI] = argstart;
argI++;
args[argI] = NULL;
}
void loader_main()
{
snprintf(confFile, 255, "%s/.loader.conf", getenv("HOME"));
struct stat confFileStat;
stat(confFile, &confFileStat);
int confFd = open(confFile, O_RDONLY);
if (confFd == -1)
{
close(confFd);
return;
}
char* conf = (char*) malloc(confFileStat.st_size);
if (conf == NULL)
{
close(confFd);
return;
}
ssize_t ret = read(confFd, conf, confFileStat.st_size);
if (ret == -1)
{
close(confFd);
return;
}
close(confFd);
size_t fI = 0;
int matchId = 0;
names[matchId] = conf;
matchId++;
for (;fI < confFileStat.st_size-1;fI++)
{
if (conf[fI] == ',')
{
names[matchId] = &conf[fI+1];
conf[fI] = '\0';
matchId++;
}
}
remove_trailing_spaces(names[matchId-1]);
read_cmdline();
make_args();
#ifdef DEBUG
int xarg=0;
while (args[xarg] != NULL)
{
DBG(".%s\n", args[xarg]);
xarg++;
}
#endif
int x;
for (x = 0;x<matchId;x++)
{
DBG("%s\n",names[x]);
if (strstr(args[0], names[x]) != NULL)
{
DBG("highjack!\n");
free(conf);
execvp(loader, args );
}
}
}
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