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/*
* Copyright (C) 2014-2016 Firejail Authors
*
* This file is part of firejail project
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "firejail.h"
static char **paths = NULL;
static int path_cnt = 0;
static char initialized = 0;
static void add_path(const char *path) {
assert(paths);
assert(path_cnt);
// filter out duplicates
int i;
int empty = 0;
for (i = 0; i < path_cnt; i++) {
if (paths[i] && strcmp(path, paths[i]) == 0) {
return;
}
if (!paths[i]) {
empty = i;
break;
}
}
paths[empty] = strdup(path);
if (!paths[empty])
errExit("strdup");
}
char **build_paths(void) {
if (initialized) {
assert(paths);
return paths;
}
initialized = 1;
int cnt = 5; // 4 default paths + 1 NULL to end the array
char *path1 = getenv("PATH");
if (path1) {
char *path2 = strdup(path1);
if (!path2)
errExit("strdup");
// use path2 to count the entries
char *ptr = strtok(path2, ":");
while (ptr) {
cnt++;
ptr = strtok(NULL, ":");
}
free(path2);
path_cnt = cnt;
// allocate paths array
paths = malloc(sizeof(char *) * cnt);
if (!paths)
errExit("malloc");
memset(paths, 0, sizeof(char *) * cnt);
// add default paths
add_path("/usr/local/bin");
add_path("/bin");
add_path("/usr/bin");
add_path("/sbin");
add_path("/usr/sbin");
path2 = strdup(path1);
if (!path2)
errExit("strdup");
// use path2 to count the entries
ptr = strtok(path2, ":");
while (ptr) {
cnt++;
add_path(ptr);
ptr = strtok(NULL, ":");
}
free(path2);
}
return paths;
}
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