| /* Code to restore the iptables state, from file by iptables-save. |
| * (C) 2000-2002 by Harald Welte <laforge@gnumonks.org> |
| * based on previous code from Rusty Russell <rusty@linuxcare.com.au> |
| * |
| * This code is distributed under the terms of GNU GPL v2 |
| * |
| * $Id$ |
| */ |
| |
| #include <getopt.h> |
| #include <sys/errno.h> |
| #include <stdbool.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include "iptables.h" |
| #include "xtables.h" |
| #include "libiptc/libiptc.h" |
| #include "iptables-multi.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 const struct option options[] = { |
| {.name = "binary", .has_arg = false, .val = 'b'}, |
| {.name = "counters", .has_arg = false, .val = 'c'}, |
| {.name = "verbose", .has_arg = false, .val = 'v'}, |
| {.name = "test", .has_arg = false, .val = 't'}, |
| {.name = "help", .has_arg = false, .val = 'h'}, |
| {.name = "noflush", .has_arg = false, .val = 'n'}, |
| {.name = "modprobe", .has_arg = true, .val = 'M'}, |
| {.name = "table", .has_arg = true, .val = 'T'}, |
| {NULL}, |
| }; |
| |
| static void print_usage(const char *name, const char *version) __attribute__((noreturn)); |
| |
| #define prog_name iptables_globals.program_name |
| |
| 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" |
| " [ --table=<TABLE> ]\n" |
| " [ --modprobe=<command>]\n", name); |
| |
| exit(1); |
| } |
| |
| static struct iptc_handle *create_handle(const char *tablename) |
| { |
| struct iptc_handle *handle; |
| |
| handle = iptc_init(tablename); |
| |
| if (!handle) { |
| /* try to insmod the module if iptc_init failed */ |
| xtables_load_ko(xtables_modprobe_program, false); |
| handle = iptc_init(tablename); |
| } |
| |
| if (!handle) { |
| xtables_error(PARAMETER_PROBLEM, "%s: unable to initialize " |
| "table '%s'\n", prog_name, tablename); |
| exit(1); |
| } |
| return handle; |
| } |
| |
| static int parse_counters(char *string, struct ipt_counters *ctr) |
| { |
| unsigned long long pcnt, bcnt; |
| int ret; |
| |
| ret = sscanf(string, "[%llu:%llu]", &pcnt, &bcnt); |
| ctr->pcnt = pcnt; |
| ctr->bcnt = bcnt; |
| return ret == 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 < ARRAY_SIZE(newargv)) { |
| newargv[newargc] = strdup(what); |
| newargc++; |
| return 1; |
| } else { |
| xtables_error(PARAMETER_PROBLEM, |
| "Parser cannot handle more arguments\n"); |
| return 0; |
| } |
| } |
| |
| static void free_argv(void) { |
| int i; |
| |
| for (i = 0; i < newargc; i++) |
| free(newargv[i]); |
| } |
| |
| #ifdef IPTABLES_MULTI |
| int |
| iptables_restore_main(int argc, char *argv[]) |
| #else |
| int |
| main(int argc, char *argv[]) |
| #endif |
| { |
| struct iptc_handle *handle = NULL; |
| char buffer[10240]; |
| int c; |
| char curtable[IPT_TABLE_MAXNAMELEN + 1]; |
| FILE *in; |
| int in_table = 0, testing = 0; |
| const char *tablename = NULL; |
| |
| line = 0; |
| |
| iptables_globals.program_name = "iptables-restore"; |
| 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, "bcvthnM:T:", 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("iptables-restore", |
| IPTABLES_VERSION); |
| break; |
| case 'n': |
| noflush = 1; |
| break; |
| case 'M': |
| xtables_modprobe_program = optarg; |
| break; |
| case 'T': |
| tablename = optarg; |
| break; |
| } |
| } |
| |
| if (optind == argc - 1) { |
| in = fopen(argv[optind], "r"); |
| if (!in) { |
| fprintf(stderr, "Can't open %s: %s\n", argv[optind], |
| strerror(errno)); |
| exit(1); |
| } |
| } |
| else if (optind < argc) { |
| fprintf(stderr, "Unknown arguments found on commandline\n"); |
| 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 = iptc_commit(handle); |
| iptc_free(handle); |
| handle = NULL; |
| } 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) { |
| xtables_error(PARAMETER_PROBLEM, |
| "%s: line %u table name invalid\n", |
| prog_name, line); |
| exit(1); |
| } |
| strncpy(curtable, table, IPT_TABLE_MAXNAMELEN); |
| curtable[IPT_TABLE_MAXNAMELEN] = '\0'; |
| |
| if (tablename && (strcmp(tablename, table) != 0)) |
| continue; |
| if (handle) |
| iptc_free(handle); |
| |
| handle = create_handle(table); |
| 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) { |
| xtables_error(PARAMETER_PROBLEM, |
| "%s: line %u chain name invalid\n", |
| prog_name, line); |
| exit(1); |
| } |
| |
| if (strlen(chain) >= XT_EXTENSION_MAXNAMELEN) |
| xtables_error(PARAMETER_PROBLEM, |
| "Invalid chain name `%s' " |
| "(%u chars max)", |
| chain, XT_EXTENSION_MAXNAMELEN - 1); |
| |
| if (iptc_builtin(chain, handle) <= 0) { |
| if (noflush && iptc_is_chain(chain, handle)) { |
| DEBUGP("Flushing existing user defined chain '%s'\n", chain); |
| if (!iptc_flush_entries(chain, handle)) |
| xtables_error(PARAMETER_PROBLEM, |
| "error flushing chain " |
| "'%s':%s\n", chain, |
| strerror(errno)); |
| } else { |
| DEBUGP("Creating new chain '%s'\n", chain); |
| if (!iptc_create_chain(chain, handle)) |
| xtables_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) { |
| xtables_error(PARAMETER_PROBLEM, |
| "%s: line %u policy invalid\n", |
| prog_name, line); |
| exit(1); |
| } |
| |
| if (strcmp(policy, "-") != 0) { |
| struct ipt_counters count; |
| |
| if (counters) { |
| char *ctrs; |
| ctrs = strtok(NULL, " \t\n"); |
| |
| if (!ctrs || !parse_counters(ctrs, &count)) |
| xtables_error(PARAMETER_PROBLEM, |
| "invalid policy counters " |
| "for chain '%s'\n", chain); |
| |
| } else { |
| memset(&count, 0, |
| sizeof(struct ipt_counters)); |
| } |
| |
| DEBUGP("Setting policy of chain %s to %s\n", |
| chain, policy); |
| |
| if (!iptc_set_policy(chain, policy, &count, |
| handle)) |
| xtables_error(OTHER_PROBLEM, |
| "Can't set policy `%s'" |
| " on `%s' line %u: %s\n", |
| policy, chain, line, |
| iptc_strerror(errno)); |
| } |
| |
| ret = 1; |
| |
| } else if (in_table) { |
| int a; |
| char *ptr = buffer; |
| char *pcnt = NULL; |
| char *bcnt = NULL; |
| char *parsestart; |
| |
| /* the parser */ |
| char *curchar; |
| int quote_open, escaped; |
| size_t param_len; |
| |
| /* reset the newargv */ |
| newargc = 0; |
| |
| if (buffer[0] == '[') { |
| /* we have counters in our input */ |
| ptr = strchr(buffer, ']'); |
| if (!ptr) |
| xtables_error(PARAMETER_PROBLEM, |
| "Bad line %u: need ]\n", |
| line); |
| |
| pcnt = strtok(buffer+1, ":"); |
| if (!pcnt) |
| xtables_error(PARAMETER_PROBLEM, |
| "Bad line %u: need :\n", |
| line); |
| |
| bcnt = strtok(NULL, "]"); |
| if (!bcnt) |
| xtables_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(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; |
| escaped = 0; |
| param_len = 0; |
| |
| for (curchar = parsestart; *curchar; curchar++) { |
| char param_buffer[1024]; |
| |
| if (quote_open) { |
| if (escaped) { |
| param_buffer[param_len++] = *curchar; |
| escaped = 0; |
| continue; |
| } else if (*curchar == '\\') { |
| escaped = 1; |
| continue; |
| } else if (*curchar == '"') { |
| quote_open = 0; |
| *curchar = ' '; |
| } else { |
| param_buffer[param_len++] = *curchar; |
| continue; |
| } |
| } else { |
| if (*curchar == '"') { |
| quote_open = 1; |
| continue; |
| } |
| } |
| |
| if (*curchar == ' ' |
| || *curchar == '\t' |
| || * curchar == '\n') { |
| if (!param_len) { |
| /* two spaces? */ |
| continue; |
| } |
| |
| param_buffer[param_len] = '\0'; |
| |
| /* check if table name specified */ |
| if (!strncmp(param_buffer, "-t", 2) |
| || !strncmp(param_buffer, "--table", 8)) { |
| xtables_error(PARAMETER_PROBLEM, |
| "Line %u seems to have a " |
| "-t table option.\n", line); |
| exit(1); |
| } |
| |
| add_argv(param_buffer); |
| param_len = 0; |
| } else { |
| /* regular character, copy to buffer */ |
| param_buffer[param_len++] = *curchar; |
| |
| if (param_len >= sizeof(param_buffer)) |
| xtables_error(PARAMETER_PROBLEM, |
| "Parameter too long!"); |
| } |
| } |
| |
| DEBUGP("calling do_command(%u, argv, &%s, handle):\n", |
| newargc, curtable); |
| |
| for (a = 0; a < newargc; a++) |
| DEBUGP("argv[%u]: %s\n", a, newargv[a]); |
| |
| ret = do_command(newargc, newargv, |
| &newargv[2], &handle); |
| |
| free_argv(); |
| fflush(stdout); |
| } |
| if (tablename && (strcmp(tablename, curtable) != 0)) |
| continue; |
| if (!ret) { |
| fprintf(stderr, "%s: line %u failed\n", |
| prog_name, line); |
| exit(1); |
| } |
| } |
| if (in_table) { |
| fprintf(stderr, "%s: COMMIT expected at line %u\n", |
| prog_name, line + 1); |
| exit(1); |
| } |
| |
| if (in != NULL) |
| fclose(in); |
| return 0; |
| } |