aboutsummaryrefslogtreecommitdiffstats
path: root/ip6tables-restore.c
diff options
context:
space:
mode:
Diffstat (limited to 'ip6tables-restore.c')
-rw-r--r--ip6tables-restore.c425
1 files changed, 425 insertions, 0 deletions
diff --git a/ip6tables-restore.c b/ip6tables-restore.c
new file mode 100644
index 0000000..e9f163b
--- /dev/null
+++ b/ip6tables-restore.c
@@ -0,0 +1,425 @@
+/* Code to restore the iptables state, from file by ip6tables-save.
+ * Author: Andras Kis-Szabo <kisza@sch.bme.hu>
+ *
+ * based on iptables-restore
+ * Authors:
+ * Harald Welte <laforge@gnumonks.org>
+ * Rusty Russell <rusty@linuxcare.com.au>
+ * This code is distributed under the terms of GNU GPL v2
+ *
+ * $Id: ip6tables-restore.c 6706 2006-12-09 13:06:04Z /C=DE/ST=Berlin/L=Berlin/O=Netfilter Project/OU=Development/CN=yasuyuki/emailAddress=yasuyuki@netfilter.org $
+ */
+
+#include <getopt.h>
+#include <sys/errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "ip6tables.h"
+#include "libiptc/libip6tc.h"
+
+#ifdef DEBUG
+#define DEBUGP(x, args...) fprintf(stderr, x, ## args)
+#else
+#define DEBUGP(x, args...)
+#endif
+
+static int binary = 0, counters = 0, verbose = 0, noflush = 0;
+
+/* Keeping track of external matches and targets. */
+static struct option options[] = {
+ { "binary", 0, 0, 'b' },
+ { "counters", 0, 0, 'c' },
+ { "verbose", 0, 0, 'v' },
+ { "test", 0, 0, 't' },
+ { "help", 0, 0, 'h' },
+ { "noflush", 0, 0, 'n'},
+ { "modprobe", 1, 0, 'M'},
+ { 0 }
+};
+
+static void print_usage(const char *name, const char *version) __attribute__((noreturn));
+
+static void print_usage(const char *name, const char *version)
+{
+ fprintf(stderr, "Usage: %s [-b] [-c] [-v] [-t] [-h]\n"
+ " [ --binary ]\n"
+ " [ --counters ]\n"
+ " [ --verbose ]\n"
+ " [ --test ]\n"
+ " [ --help ]\n"
+ " [ --noflush ]\n"
+ " [ --modprobe=<command>]\n", name);
+
+ exit(1);
+}
+
+ip6tc_handle_t create_handle(const char *tablename, const char* modprobe)
+{
+ ip6tc_handle_t handle;
+
+ handle = ip6tc_init(tablename);
+
+ if (!handle) {
+ /* try to insmod the module if iptc_init failed */
+ ip6tables_insmod("ip6_tables", modprobe);
+ handle = ip6tc_init(tablename);
+ }
+
+ if (!handle) {
+ exit_error(PARAMETER_PROBLEM, "%s: unable to initialize"
+ "table '%s'\n", program_name, tablename);
+ exit(1);
+ }
+ return handle;
+}
+
+static int parse_counters(char *string, struct ip6t_counters *ctr)
+{
+ return (sscanf(string, "[%llu:%llu]", (unsigned long long *)&ctr->pcnt, (unsigned long long *)&ctr->bcnt) == 2);
+}
+
+/* global new argv and argc */
+static char *newargv[255];
+static int newargc;
+
+/* function adding one argument to newargv, updating newargc
+ * returns true if argument added, false otherwise */
+static int add_argv(char *what) {
+ DEBUGP("add_argv: %s\n", what);
+ if (what && ((newargc + 1) < sizeof(newargv)/sizeof(char *))) {
+ newargv[newargc] = strdup(what);
+ newargc++;
+ return 1;
+ } else
+ return 0;
+}
+
+static void free_argv(void) {
+ int i;
+
+ for (i = 0; i < newargc; i++)
+ free(newargv[i]);
+}
+
+int main(int argc, char *argv[])
+{
+ ip6tc_handle_t handle = NULL;
+ char buffer[10240];
+ int c;
+ char curtable[IP6T_TABLE_MAXNAMELEN + 1];
+ FILE *in;
+ const char *modprobe = 0;
+ int in_table = 0, testing = 0;
+
+ program_name = "ip6tables-restore";
+ program_version = IPTABLES_VERSION;
+ line = 0;
+
+ lib_dir = getenv("IP6TABLES_LIB_DIR");
+ if (!lib_dir)
+ lib_dir = IP6T_LIB_DIR;
+
+#ifdef NO_SHARED_LIBS
+ init_extensions();
+#endif
+
+ while ((c = getopt_long(argc, argv, "bcvthnM:", options, NULL)) != -1) {
+ switch (c) {
+ case 'b':
+ binary = 1;
+ break;
+ case 'c':
+ counters = 1;
+ break;
+ case 'v':
+ verbose = 1;
+ break;
+ case 't':
+ testing = 1;
+ break;
+ case 'h':
+ print_usage("ip6tables-restore",
+ IPTABLES_VERSION);
+ break;
+ case 'n':
+ noflush = 1;
+ break;
+ case 'M':
+ modprobe = optarg;
+ break;
+ }
+ }
+
+ if (optind == argc - 1) {
+ in = fopen(argv[optind], "r");
+ if (!in) {
+ fprintf(stderr, "Can't open %s: %s", argv[optind],
+ strerror(errno));
+ exit(1);
+ }
+ }
+ else if (optind < argc) {
+ fprintf(stderr, "Unknown arguments found on commandline");
+ exit(1);
+ }
+ else in = stdin;
+
+ /* Grab standard input. */
+ while (fgets(buffer, sizeof(buffer), in)) {
+ int ret = 0;
+
+ line++;
+ if (buffer[0] == '\n')
+ continue;
+ else if (buffer[0] == '#') {
+ if (verbose)
+ fputs(buffer, stdout);
+ continue;
+ } else if ((strcmp(buffer, "COMMIT\n") == 0) && (in_table)) {
+ if (!testing) {
+ DEBUGP("Calling commit\n");
+ ret = ip6tc_commit(&handle);
+ } else {
+ DEBUGP("Not calling commit, testing\n");
+ ret = 1;
+ }
+ in_table = 0;
+ } else if ((buffer[0] == '*') && (!in_table)) {
+ /* New table */
+ char *table;
+
+ table = strtok(buffer+1, " \t\n");
+ DEBUGP("line %u, table '%s'\n", line, table);
+ if (!table) {
+ exit_error(PARAMETER_PROBLEM,
+ "%s: line %u table name invalid\n",
+ program_name, line);
+ exit(1);
+ }
+ strncpy(curtable, table, IP6T_TABLE_MAXNAMELEN);
+ curtable[IP6T_TABLE_MAXNAMELEN] = '\0';
+
+ if (handle)
+ ip6tc_free(&handle);
+
+ handle = create_handle(table, modprobe);
+ if (noflush == 0) {
+ DEBUGP("Cleaning all chains of table '%s'\n",
+ table);
+ for_each_chain(flush_entries, verbose, 1,
+ &handle);
+
+ DEBUGP("Deleting all user-defined chains "
+ "of table '%s'\n", table);
+ for_each_chain(delete_chain, verbose, 0,
+ &handle) ;
+ }
+
+ ret = 1;
+ in_table = 1;
+
+ } else if ((buffer[0] == ':') && (in_table)) {
+ /* New chain. */
+ char *policy, *chain;
+
+ chain = strtok(buffer+1, " \t\n");
+ DEBUGP("line %u, chain '%s'\n", line, chain);
+ if (!chain) {
+ exit_error(PARAMETER_PROBLEM,
+ "%s: line %u chain name invalid\n",
+ program_name, line);
+ exit(1);
+ }
+
+ if (ip6tc_builtin(chain, handle) <= 0) {
+ if (noflush && ip6tc_is_chain(chain, handle)) {
+ DEBUGP("Flushing existing user defined chain '%s'\n", chain);
+ if (!ip6tc_flush_entries(chain, &handle))
+ exit_error(PARAMETER_PROBLEM,
+ "error flushing chain "
+ "'%s':%s\n", chain,
+ strerror(errno));
+ } else {
+ DEBUGP("Creating new chain '%s'\n", chain);
+ if (!ip6tc_create_chain(chain, &handle))
+ exit_error(PARAMETER_PROBLEM,
+ "error creating chain "
+ "'%s':%s\n", chain,
+ strerror(errno));
+ }
+ }
+
+ policy = strtok(NULL, " \t\n");
+ DEBUGP("line %u, policy '%s'\n", line, policy);
+ if (!policy) {
+ exit_error(PARAMETER_PROBLEM,
+ "%s: line %u policy invalid\n",
+ program_name, line);
+ exit(1);
+ }
+
+ if (strcmp(policy, "-") != 0) {
+ struct ip6t_counters count;
+
+ if (counters) {
+ char *ctrs;
+ ctrs = strtok(NULL, " \t\n");
+
+ if (!ctrs || !parse_counters(ctrs, &count))
+ exit_error(PARAMETER_PROBLEM,
+ "invalid policy counters "
+ "for chain '%s'\n", chain);
+
+ } else {
+ memset(&count, 0,
+ sizeof(struct ip6t_counters));
+ }
+
+ DEBUGP("Setting policy of chain %s to %s\n",
+ chain, policy);
+
+ if (!ip6tc_set_policy(chain, policy, &count,
+ &handle))
+ exit_error(OTHER_PROBLEM,
+ "Can't set policy `%s'"
+ " on `%s' line %u: %s\n",
+ chain, policy, line,
+ ip6tc_strerror(errno));
+ }
+
+ ret = 1;
+
+ } else if (in_table) {
+ int a;
+ char *ptr = buffer;
+ char *pcnt = NULL;
+ char *bcnt = NULL;
+ char *parsestart;
+
+ /* the parser */
+ char *param_start, *curchar;
+ int quote_open;
+
+ /* reset the newargv */
+ newargc = 0;
+
+ if (buffer[0] == '[') {
+ /* we have counters in our input */
+ ptr = strchr(buffer, ']');
+ if (!ptr)
+ exit_error(PARAMETER_PROBLEM,
+ "Bad line %u: need ]\n",
+ line);
+
+ pcnt = strtok(buffer+1, ":");
+ if (!pcnt)
+ exit_error(PARAMETER_PROBLEM,
+ "Bad line %u: need :\n",
+ line);
+
+ bcnt = strtok(NULL, "]");
+ if (!bcnt)
+ exit_error(PARAMETER_PROBLEM,
+ "Bad line %u: need ]\n",
+ line);
+
+ /* start command parsing after counter */
+ parsestart = ptr + 1;
+ } else {
+ /* start command parsing at start of line */
+ parsestart = buffer;
+ }
+
+ add_argv(argv[0]);
+ add_argv("-t");
+ add_argv((char *) &curtable);
+
+ if (counters && pcnt && bcnt) {
+ add_argv("--set-counters");
+ add_argv((char *) pcnt);
+ add_argv((char *) bcnt);
+ }
+
+ /* After fighting with strtok enough, here's now
+ * a 'real' parser. According to Rusty I'm now no
+ * longer a real hacker, but I can live with that */
+
+ quote_open = 0;
+ param_start = parsestart;
+
+ for (curchar = parsestart; *curchar; curchar++) {
+ if (*curchar == '"') {
+ /* quote_open cannot be true if there
+ * was no previous character. Thus,
+ * curchar-1 has to be within bounds */
+ if (quote_open &&
+ *(curchar-1) != '\\') {
+ quote_open = 0;
+ *curchar = ' ';
+ } else {
+ quote_open = 1;
+ param_start++;
+ }
+ }
+ if (*curchar == ' '
+ || *curchar == '\t'
+ || * curchar == '\n') {
+ char param_buffer[1024];
+ int param_len = curchar-param_start;
+
+ if (quote_open)
+ continue;
+
+ if (!param_len) {
+ /* two spaces? */
+ param_start++;
+ continue;
+ }
+
+ /* end of one parameter */
+ strncpy(param_buffer, param_start,
+ param_len);
+ *(param_buffer+param_len) = '\0';
+
+ /* check if table name specified */
+ if (!strncmp(param_buffer, "-t", 3)
+ || !strncmp(param_buffer, "--table", 8)) {
+ exit_error(PARAMETER_PROBLEM,
+ "Line %u seems to have a "
+ "-t table option.\n", line);
+ exit(1);
+ }
+
+ add_argv(param_buffer);
+ param_start += param_len + 1;
+ } else {
+ /* regular character, skip */
+ }
+ }
+
+ DEBUGP("calling do_command6(%u, argv, &%s, handle):\n",
+ newargc, curtable);
+
+ for (a = 0; a < newargc; a++)
+ DEBUGP("argv[%u]: %s\n", a, newargv[a]);
+
+ ret = do_command6(newargc, newargv,
+ &newargv[2], &handle);
+
+ free_argv();
+ }
+ if (!ret) {
+ fprintf(stderr, "%s: line %u failed\n",
+ program_name, line);
+ exit(1);
+ }
+ }
+ if (in_table) {
+ fprintf(stderr, "%s: COMMIT expected at line %u\n",
+ program_name, line + 1);
+ exit(1);
+ }
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-08 13:42:31 +0000