/* Code to save the iptables state, in human readable-form. */
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/* (C) 1999 by Paul 'Rusty' Russell <rusty@rustcorp.com.au> and
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* (C) 2000-2002 by Harald Welte <laforge@gnumonks.org>
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*
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* This code is distributed under the terms of GNU GPL v2
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*
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*/
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#include <getopt.h>
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#include <errno.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <netdb.h>
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#include "libiptc/libiptc.h"
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#include "iptables.h"
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#include "iptables-multi.h"
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static int show_counters = 0;
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static const struct option options[] = {
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{.name = "counters", .has_arg = false, .val = 'c'},
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{.name = "dump", .has_arg = false, .val = 'd'},
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{.name = "table", .has_arg = true, .val = 't'},
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{.name = "modprobe", .has_arg = true, .val = 'M'},
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{NULL},
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};
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/* Debugging prototype. */
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static int for_each_table(int (*func)(const char *tablename))
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{
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int ret = 1;
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FILE *procfile = NULL;
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char tablename[XT_TABLE_MAXNAMELEN+1];
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static const char filename[] = "/proc/net/ip_tables_names";
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procfile = fopen(filename, "re");
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if (!procfile) {
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if (errno == ENOENT)
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return ret;
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fprintf(stderr, "Failed to list table names in %s: %s\n",
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filename, strerror(errno));
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exit(1);
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}
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while (fgets(tablename, sizeof(tablename), procfile)) {
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if (tablename[strlen(tablename) - 1] != '\n')
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xtables_error(OTHER_PROBLEM,
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"Badly formed tablename `%s'\n",
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tablename);
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tablename[strlen(tablename) - 1] = '\0';
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ret &= func(tablename);
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}
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fclose(procfile);
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return ret;
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}
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static int do_output(const char *tablename)
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{
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struct xtc_handle *h;
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const char *chain = NULL;
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if (!tablename)
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return for_each_table(&do_output);
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h = iptc_init(tablename);
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if (h == NULL) {
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xtables_load_ko(xtables_modprobe_program, false);
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h = iptc_init(tablename);
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}
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if (!h)
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xtables_error(OTHER_PROBLEM, "Cannot initialize: %s\n",
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iptc_strerror(errno));
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time_t now = time(NULL);
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printf("# Generated by iptables-save v%s on %s",
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IPTABLES_VERSION, ctime(&now));
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printf("*%s\n", tablename);
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/* Dump out chain names first,
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* thereby preventing dependency conflicts */
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for (chain = iptc_first_chain(h);
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chain;
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chain = iptc_next_chain(h)) {
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printf(":%s ", chain);
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if (iptc_builtin(chain, h)) {
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struct xt_counters count;
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printf("%s ",
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iptc_get_policy(chain, &count, h));
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printf("[%llu:%llu]\n", (unsigned long long)count.pcnt, (unsigned long long)count.bcnt);
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} else {
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printf("- [0:0]\n");
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}
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}
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for (chain = iptc_first_chain(h);
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chain;
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chain = iptc_next_chain(h)) {
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const struct ipt_entry *e;
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/* Dump out rules */
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e = iptc_first_rule(chain, h);
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while(e) {
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print_rule4(e, h, chain, show_counters);
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e = iptc_next_rule(e, h);
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}
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}
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now = time(NULL);
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printf("COMMIT\n");
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printf("# Completed on %s", ctime(&now));
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iptc_free(h);
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return 1;
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}
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/* Format:
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* :Chain name POLICY packets bytes
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* rule
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*/
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int
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iptables_save_main(int argc, char *argv[])
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{
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const char *tablename = NULL;
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int c;
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iptables_globals.program_name = "iptables-save";
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c = xtables_init_all(&iptables_globals, NFPROTO_IPV4);
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if (c < 0) {
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fprintf(stderr, "%s/%s Failed to initialize xtables\n",
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iptables_globals.program_name,
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iptables_globals.program_version);
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exit(1);
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}
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#if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
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init_extensions();
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init_extensions4();
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#endif
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while ((c = getopt_long(argc, argv, "bcdt:M:", options, NULL)) != -1) {
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switch (c) {
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case 'b':
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fprintf(stderr, "-b/--binary option is not implemented\n");
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break;
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case 'c':
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show_counters = 1;
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break;
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case 't':
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/* Select specific table. */
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tablename = optarg;
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break;
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case 'M':
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xtables_modprobe_program = optarg;
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break;
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case 'd':
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do_output(tablename);
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exit(0);
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}
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}
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if (optind < argc) {
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fprintf(stderr, "Unknown arguments found on commandline\n");
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exit(1);
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}
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return !do_output(tablename);
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}
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