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/* Code to save the iptables state, in human readable-form. */
/* (C) 1999 by Paul 'Rusty' Russell <rusty@rustcorp.com.au> and
* (C) 2000-2002 by Harald Welte <laforge@gnumonks.org>
*
* This code is distributed under the terms of GNU GPL v2
*
*/
#include <getopt.h>
#include <sys/errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <netdb.h>
#include "libiptc/libiptc.h"
#include "iptables.h"
#include "iptables-multi.h"
#ifndef NO_SHARED_LIBS
#include <dlfcn.h>
#endif
static int show_binary = 0, show_counters = 0;
static const struct option options[] = {
{.name = "binary", .has_arg = false, .val = 'b'},
{.name = "counters", .has_arg = false, .val = 'c'},
{.name = "dump", .has_arg = false, .val = 'd'},
{.name = "table", .has_arg = true, .val = 't'},
{.name = "modprobe", .has_arg = true, .val = 'M'},
{NULL},
};
/* Debugging prototype. */
static int for_each_table(int (*func)(const char *tablename))
{
int ret = 1;
FILE *procfile = NULL;
char tablename[IPT_TABLE_MAXNAMELEN+1];
procfile = fopen("/proc/net/ip_tables_names", "re");
if (!procfile)
return ret;
while (fgets(tablename, sizeof(tablename), procfile)) {
if (tablename[strlen(tablename) - 1] != '\n')
xtables_error(OTHER_PROBLEM,
"Badly formed tablename `%s'\n",
tablename);
tablename[strlen(tablename) - 1] = '\0';
ret &= func(tablename);
}
fclose(procfile);
return ret;
}
static int do_output(const char *tablename)
{
struct iptc_handle *h;
const char *chain = NULL;
if (!tablename)
return for_each_table(&do_output);
h = iptc_init(tablename);
if (h == NULL) {
xtables_load_ko(xtables_modprobe_program, false);
h = iptc_init(tablename);
}
if (!h)
xtables_error(OTHER_PROBLEM, "Cannot initialize: %s\n",
iptc_strerror(errno));
if (!show_binary) {
time_t now = time(NULL);
printf("# Generated by iptables-save v%s on %s",
IPTABLES_VERSION, ctime(&now));
printf("*%s\n", tablename);
/* Dump out chain names first,
* thereby preventing dependency conflicts */
for (chain = iptc_first_chain(h);
chain;
chain = iptc_next_chain(h)) {
printf(":%s ", chain);
if (iptc_builtin(chain, h)) {
struct ipt_counters count;
printf("%s ",
iptc_get_policy(chain, &count, h));
printf("[%llu:%llu]\n", (unsigned long long)count.pcnt, (unsigned long long)count.bcnt);
} else {
printf("- [0:0]\n");
}
}
for (chain = iptc_first_chain(h);
chain;
chain = iptc_next_chain(h)) {
const struct ipt_entry *e;
/* Dump out rules */
e = iptc_first_rule(chain, h);
while(e) {
print_rule(e, h, chain, show_counters);
e = iptc_next_rule(e, h);
}
}
now = time(NULL);
printf("COMMIT\n");
printf("# Completed on %s", ctime(&now));
} else {
/* Binary, huh? OK. */
xtables_error(OTHER_PROBLEM, "Binary NYI\n");
}
iptc_free(h);
return 1;
}
/* Format:
* :Chain name POLICY packets bytes
* rule
*/
#ifdef IPTABLES_MULTI
int
iptables_save_main(int argc, char *argv[])
#else
int
main(int argc, char *argv[])
#endif
{
const char *tablename = NULL;
int c;
iptables_globals.program_name = "iptables-save";
c = xtables_init_all(&iptables_globals, NFPROTO_IPV4);
if (c < 0) {
fprintf(stderr, "%s/%s Failed to initialize xtables\n",
iptables_globals.program_name,
iptables_globals.program_version);
exit(1);
}
#if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
init_extensions();
#endif
while ((c = getopt_long(argc, argv, "bcdt:", options, NULL)) != -1) {
switch (c) {
case 'b':
show_binary = 1;
break;
case 'c':
show_counters = 1;
break;
case 't':
/* Select specific table. */
tablename = optarg;
break;
case 'M':
xtables_modprobe_program = optarg;
break;
case 'd':
do_output(tablename);
exit(0);
}
}
if (optind < argc) {
fprintf(stderr, "Unknown arguments found on commandline\n");
exit(1);
}
return !do_output(tablename);
}
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