Joszef Kadlecsik | b9a4938 | 2004-12-01 09:11:33 +0000 | [diff] [blame] | 1 | /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu> |
| 2 | * Patrick Schaaf <bof@bof.de> |
| 3 | * Martin Josefsson <gandalf@wlug.westbo.se> |
| 4 | * Copyright (C) 2003-2004 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
Joszef Kadlecsik | 9c50ebe | 2004-02-09 13:47:01 +0000 | [diff] [blame] | 11 | /* Shared library add-on to iptables to add IP set mangling target. */ |
| 12 | #include <stdio.h> |
| 13 | #include <netdb.h> |
| 14 | #include <string.h> |
| 15 | #include <stdlib.h> |
| 16 | #include <getopt.h> |
| 17 | #include <ctype.h> |
| 18 | |
| 19 | #include <iptables.h> |
| 20 | #include <linux/netfilter_ipv4/ip_tables.h> |
Joszef Kadlecsik | 9c50ebe | 2004-02-09 13:47:01 +0000 | [diff] [blame] | 21 | #include <linux/netfilter_ipv4/ip_set.h> |
| 22 | #include <linux/netfilter_ipv4/ipt_set.h> |
Joszef Kadlecsik | b9a4938 | 2004-12-01 09:11:33 +0000 | [diff] [blame] | 23 | #include "libipt_set.h" |
Joszef Kadlecsik | 9c50ebe | 2004-02-09 13:47:01 +0000 | [diff] [blame] | 24 | |
| 25 | /* Function which prints out usage message. */ |
| 26 | static void help(void) |
| 27 | { |
| 28 | printf("SET v%s options:\n" |
Joszef Kadlecsik | b9a4938 | 2004-12-01 09:11:33 +0000 | [diff] [blame] | 29 | " --add-set name flags\n" |
| 30 | " --del-set name flags\n" |
Joszef Kadlecsik | 9c50ebe | 2004-02-09 13:47:01 +0000 | [diff] [blame] | 31 | " add/del src/dst IP/port from/to named sets,\n" |
| 32 | " where flags are the comma separated list of\n" |
| 33 | " 'src' and 'dst'.\n" |
| 34 | "\n", IPTABLES_VERSION); |
| 35 | } |
| 36 | |
| 37 | static struct option opts[] = { |
| 38 | {"add-set", 1, 0, '1'}, |
| 39 | {"del-set", 1, 0, '2'}, |
| 40 | {0} |
| 41 | }; |
| 42 | |
| 43 | /* Initialize the target. */ |
| 44 | static void init(struct ipt_entry_target *target, unsigned int *nfcache) |
| 45 | { |
| 46 | struct ipt_set_info_target *info = |
| 47 | (struct ipt_set_info_target *) target->data; |
| 48 | |
| 49 | memset(info, 0, sizeof(struct ipt_set_info_target)); |
Joszef Kadlecsik | b9a4938 | 2004-12-01 09:11:33 +0000 | [diff] [blame] | 50 | info->add_set.index = |
| 51 | info->del_set.index = IP_SET_INVALID_ID; |
Joszef Kadlecsik | 9c50ebe | 2004-02-09 13:47:01 +0000 | [diff] [blame] | 52 | |
Joszef Kadlecsik | 9c50ebe | 2004-02-09 13:47:01 +0000 | [diff] [blame] | 53 | } |
| 54 | |
Joszef Kadlecsik | b9a4938 | 2004-12-01 09:11:33 +0000 | [diff] [blame] | 55 | static void |
| 56 | parse_target(char **argv, int invert, unsigned int *flags, |
| 57 | struct ipt_set_info *info, const char *what) |
| 58 | { |
| 59 | if (info->flags[0]) |
| 60 | exit_error(PARAMETER_PROBLEM, |
| 61 | "--%s can be specified only once", what); |
| 62 | |
| 63 | if (check_inverse(optarg, &invert, NULL, 0)) |
| 64 | exit_error(PARAMETER_PROBLEM, |
| 65 | "Unexpected `!' after --%s", what); |
| 66 | |
| 67 | if (!argv[optind] |
| 68 | || argv[optind][0] == '-' || argv[optind][0] == '!') |
| 69 | exit_error(PARAMETER_PROBLEM, |
| 70 | "--%s requires two args.", what); |
| 71 | |
| 72 | if (strlen(argv[optind-1]) > IP_SET_MAXNAMELEN - 1) |
| 73 | exit_error(PARAMETER_PROBLEM, |
| 74 | "setname `%s' too long, max %d characters.", |
| 75 | argv[optind-1], IP_SET_MAXNAMELEN - 1); |
| 76 | |
| 77 | get_set_byname(argv[optind - 1], info); |
| 78 | parse_bindings(argv[optind], info); |
| 79 | optind++; |
| 80 | |
| 81 | *flags = 1; |
| 82 | } |
| 83 | |
Joszef Kadlecsik | 9c50ebe | 2004-02-09 13:47:01 +0000 | [diff] [blame] | 84 | /* Function which parses command options; returns true if it |
| 85 | ate an option */ |
| 86 | static int |
| 87 | parse(int c, char **argv, int invert, unsigned int *flags, |
| 88 | const struct ipt_entry *entry, struct ipt_entry_target **target) |
| 89 | { |
| 90 | struct ipt_set_info_target *myinfo = |
| 91 | (struct ipt_set_info_target *) (*target)->data; |
Joszef Kadlecsik | 9c50ebe | 2004-02-09 13:47:01 +0000 | [diff] [blame] | 92 | |
| 93 | switch (c) { |
Joszef Kadlecsik | b9a4938 | 2004-12-01 09:11:33 +0000 | [diff] [blame] | 94 | case '1': /* --add-set <set> <flags> */ |
| 95 | parse_target(argv, invert, flags, |
| 96 | &myinfo->add_set, "add-set"); |
Joszef Kadlecsik | 9c50ebe | 2004-02-09 13:47:01 +0000 | [diff] [blame] | 97 | break; |
| 98 | case '2': /* --del-set <set>[:<flags>] <flags> */ |
Joszef Kadlecsik | b9a4938 | 2004-12-01 09:11:33 +0000 | [diff] [blame] | 99 | parse_target(argv, invert, flags, |
| 100 | &myinfo->del_set, "del-set"); |
Joszef Kadlecsik | 9c50ebe | 2004-02-09 13:47:01 +0000 | [diff] [blame] | 101 | break; |
| 102 | |
| 103 | default: |
| 104 | return 0; |
| 105 | } |
| 106 | return 1; |
| 107 | } |
| 108 | |
| 109 | /* Final check; must specify at least one. */ |
| 110 | static void final_check(unsigned int flags) |
| 111 | { |
| 112 | if (!flags) |
| 113 | exit_error(PARAMETER_PROBLEM, |
| 114 | "You must specify either `--add-set' or `--del-set'"); |
| 115 | } |
| 116 | |
| 117 | static void |
| 118 | print_target(const char *prefix, const struct ipt_set_info *info) |
| 119 | { |
| 120 | int i; |
| 121 | char setname[IP_SET_MAXNAMELEN]; |
Michal Pokrywka | b9e814c | 2005-03-18 08:05:10 +0000 | [diff] [blame] | 122 | |
| 123 | if (info->index == IP_SET_INVALID_ID) |
| 124 | return; |
Joszef Kadlecsik | b9a4938 | 2004-12-01 09:11:33 +0000 | [diff] [blame] | 125 | get_set_byid(setname, info->index); |
| 126 | printf("%s %s", prefix, setname); |
| 127 | for (i = 0; i < IP_SET_MAX_BINDINGS; i++) { |
| 128 | if (!info->flags[i]) |
| 129 | break; |
| 130 | printf("%s%s", |
| 131 | i == 0 ? " " : ",", |
| 132 | info->flags[i] & IPSET_SRC ? "src" : "dst"); |
Joszef Kadlecsik | 9c50ebe | 2004-02-09 13:47:01 +0000 | [diff] [blame] | 133 | } |
Joszef Kadlecsik | b9a4938 | 2004-12-01 09:11:33 +0000 | [diff] [blame] | 134 | printf(" "); |
Joszef Kadlecsik | 9c50ebe | 2004-02-09 13:47:01 +0000 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | /* Prints out the targinfo. */ |
| 138 | static void |
| 139 | print(const struct ipt_ip *ip, |
| 140 | const struct ipt_entry_target *target, int numeric) |
| 141 | { |
| 142 | struct ipt_set_info_target *info = |
| 143 | (struct ipt_set_info_target *) target->data; |
| 144 | |
| 145 | print_target("add-set", &info->add_set); |
| 146 | print_target("del-set", &info->del_set); |
| 147 | } |
| 148 | |
| 149 | /* Saves the union ipt_targinfo in parsable form to stdout. */ |
| 150 | static void |
| 151 | save(const struct ipt_ip *ip, const struct ipt_entry_target *target) |
| 152 | { |
| 153 | struct ipt_set_info_target *info = |
| 154 | (struct ipt_set_info_target *) target->data; |
| 155 | |
| 156 | print_target("--add-set", &info->add_set); |
| 157 | print_target("--del-set", &info->del_set); |
| 158 | } |
| 159 | |
| 160 | static |
| 161 | struct iptables_target ipt_set_target |
| 162 | = { |
| 163 | .name = "SET", |
| 164 | .version = IPTABLES_VERSION, |
| 165 | .size = IPT_ALIGN(sizeof(struct ipt_set_info_target)), |
| 166 | .userspacesize = IPT_ALIGN(sizeof(struct ipt_set_info_target)), |
| 167 | .help = &help, |
| 168 | .init = &init, |
| 169 | .parse = &parse, |
| 170 | .final_check = &final_check, |
| 171 | .print = &print, |
| 172 | .save = &save, |
| 173 | .extra_opts = opts |
| 174 | }; |
| 175 | |
| 176 | void _init(void) |
| 177 | { |
| 178 | register_target(&ipt_set_target); |
| 179 | } |