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/* Code to save the xtables 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>
* (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This code is distributed under the terms of GNU GPL v2
*
*/
#include <getopt.h>
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <netdb.h>
#include <unistd.h>
#include "libiptc/libiptc.h"
#include "iptables.h"
#include "xtables-multi.h"
#include "nft.h"
#include <libnftnl/chain.h>
#ifndef NO_SHARED_LIBS
#include <dlfcn.h>
#endif
#define prog_name xtables_globals.program_name
#define prog_vers xtables_globals.program_version
static bool show_counters = false;
static const struct option options[] = {
{.name = "counters", .has_arg = false, .val = 'c'},
{.name = "version", .has_arg = false, .val = 'V'},
{.name = "dump", .has_arg = false, .val = 'd'},
{.name = "table", .has_arg = true, .val = 't'},
{.name = "modprobe", .has_arg = true, .val = 'M'},
{.name = "file", .has_arg = true, .val = 'f'},
{.name = "ipv4", .has_arg = false, .val = '4'},
{.name = "ipv6", .has_arg = false, .val = '6'},
{NULL},
};
static int
__do_output(struct nft_handle *h, const char *tablename, bool counters)
{
struct nftnl_chain_list *chain_list;
if (!nft_table_find(h, tablename)) {
printf("Table `%s' does not exist\n", tablename);
return 1;
}
if (!nft_is_table_compatible(h, tablename)) {
printf("# Table `%s' is incompatible, use 'nft' tool.\n", tablename);
return 0;
}
chain_list = nft_chain_dump(h);
time_t now = time(NULL);
printf("# Generated by xtables-save v%s on %s",
IPTABLES_VERSION, ctime(&now));
printf("*%s\n", tablename);
/* Dump out chain names first,
* thereby preventing dependency conflicts */
nft_chain_save(h, chain_list, tablename);
nft_rule_save(h, tablename, counters);
now = time(NULL);
printf("COMMIT\n");
printf("# Completed on %s", ctime(&now));
return 0;
}
static int
do_output(struct nft_handle *h, const char *tablename, bool counters)
{
int ret;
if (!tablename) {
ret = nft_for_each_table(h, __do_output, counters);
nft_check_xt_legacy(h->family, true);
return !!ret;
}
ret = __do_output(h, tablename, counters);
nft_check_xt_legacy(h->family, true);
return ret;
}
/* Format:
* :Chain name POLICY packets bytes
* rule
*/
static int
xtables_save_main(int family, const char *progname, int argc, char *argv[])
{
struct builtin_table *tables;
const char *tablename = NULL;
bool dump = false;
struct nft_handle h = {
.family = family,
};
FILE *file = NULL;
int ret, c;
xtables_globals.program_name = progname;
c = xtables_init_all(&xtables_globals, family);
if (c < 0) {
fprintf(stderr, "%s/%s Failed to initialize xtables\n",
xtables_globals.program_name,
xtables_globals.program_version);
exit(1);
}
while ((c = getopt_long(argc, argv, "bcdt:M:f:46V", options, NULL)) != -1) {
switch (c) {
case 'b':
fprintf(stderr, "-b/--binary option is not implemented\n");
break;
case 'c':
show_counters = true;
break;
case 't':
/* Select specific table. */
tablename = optarg;
break;
case 'M':
xtables_modprobe_program = optarg;
break;
case 'f':
file = fopen(optarg, "w");
if (file == NULL) {
fprintf(stderr, "Failed to open file, error: %s\n",
strerror(errno));
exit(1);
}
ret = dup2(fileno(file), STDOUT_FILENO);
if (ret == -1) {
fprintf(stderr, "Failed to redirect stdout, error: %s\n",
strerror(errno));
exit(1);
}
fclose(file);
break;
case 'd':
dump = true;
break;
case '4':
h.family = AF_INET;
break;
case '6':
h.family = AF_INET6;
xtables_set_nfproto(AF_INET6);
break;
case 'V':
printf("%s v%s (nf_tables)\n", prog_name, prog_vers);
exit(0);
default:
fprintf(stderr,
"Look at manual page `xtables-save.8' for more information.\n");
exit(1);
}
}
if (optind < argc) {
fprintf(stderr, "Unknown arguments found on commandline\n");
exit(1);
}
switch (family) {
case NFPROTO_IPV4:
case NFPROTO_IPV6: /* fallthough, same table */
#if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
init_extensions();
init_extensions4();
#endif
tables = xtables_ipv4;
break;
case NFPROTO_ARP:
tables = xtables_arp;
break;
case NFPROTO_BRIDGE:
tables = xtables_bridge;
break;
default:
fprintf(stderr, "Unknown family %d\n", family);
return 1;
}
if (nft_init(&h, tables) < 0) {
fprintf(stderr, "%s/%s Failed to initialize nft: %s\n",
xtables_globals.program_name,
xtables_globals.program_version,
strerror(errno));
exit(EXIT_FAILURE);
}
if (dump) {
do_output(&h, tablename, show_counters);
exit(0);
}
return do_output(&h, tablename, show_counters);
}
int xtables_ip4_save_main(int argc, char *argv[])
{
return xtables_save_main(NFPROTO_IPV4, "iptables-save", argc, argv);
}
int xtables_ip6_save_main(int argc, char *argv[])
{
return xtables_save_main(NFPROTO_IPV6, "ip6tables-save", argc, argv);
}
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