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/*
* Copyright (C) 2014-2017 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 "../include/common.h"
#define MAXBUF 4098
int arg_quiet = 0;
static char *default_filter =
"*filter\n"
":INPUT DROP [0:0]\n"
":FORWARD DROP [0:0]\n"
":OUTPUT ACCEPT [0:0]\n"
"-A INPUT -i lo -j ACCEPT\n"
"-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT\n"
"# echo replay is handled by -m state RELATED/ESTABLISHED below\n"
"#-A INPUT -p icmp --icmp-type echo-reply -j ACCEPT\n"
"-A INPUT -p icmp --icmp-type destination-unreachable -j ACCEPT\n"
"-A INPUT -p icmp --icmp-type time-exceeded -j ACCEPT\n"
"-A INPUT -p icmp --icmp-type echo-request -j ACCEPT \n"
"# disable STUN\n"
"-A OUTPUT -p udp --dport 3478 -j DROP\n"
"-A OUTPUT -p udp --dport 3479 -j DROP\n"
"-A OUTPUT -p tcp --dport 3478 -j DROP\n"
"-A OUTPUT -p tcp --dport 3479 -j DROP\n"
"COMMIT\n";
static void usage(void) {
printf("Usage:\n");
printf("\tfnetfilter netfilter-command destination-file\n");
}
int main(int argc, char **argv) {
#if 0
{
system("cat /proc/self/status");
int i;
for (i = 0; i < argc; i++)
printf("*%s* ", argv[i]);
printf("\n");
}
#endif
char *quiet = getenv("FIREJAIL_QUIET");
if (quiet && strcmp(quiet, "yes") == 0)
arg_quiet = 1;
if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") ==0) {
usage();
return 0;
}
if (argc != 2 && argc != 3) {
usage();
return 1;
}
char *destfile = (argc == 3)? argv[2]: argv[1];
char *command = (argc == 3)? argv[1]: NULL;
//printf("command %s\n", command);
//printf("destfile %s\n", destfile);
// handle default config (command = NULL, destfile)
if (command == NULL) {
// create a default filter file
FILE *fp = fopen(destfile, "w");
if (!fp) {
fprintf(stderr, "Error fnetfilter: cannot open %s\n", destfile);
exit(1);
}
fprintf(fp, "%s\n", default_filter);
fclose(fp);
}
else {
// copy the file
FILE *fp1 = fopen(command, "r");
if (!fp1) {
fprintf(stderr, "Error fnetfilter: cannot open %s\n", command);
exit(1);
}
FILE *fp2 = fopen(destfile, "w");
if (!fp2) {
fprintf(stderr, "Error fnetfilter: cannot open %s\n", destfile);
exit(1);
}
char buf[MAXBUF];
while (fgets(buf, MAXBUF, fp1))
fprintf(fp2, "%s", buf);
fclose(fp1);
fclose(fp2);
}
printf("fnetfilter running\n");
return 0;
}
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