Maximilian Münchow
8 years ago
6 changed files with 351 additions and 34 deletions
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@@ -0,0 +1,146 @@
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/*
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* "ts3init" match extension for iptables |
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* Niels Werensteijn <niels werensteijn [at] teamspeak com>, 2016-10-03 |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License; either version 2 |
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* or 3 of the License, as published by the Free Software Foundation. |
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*/ |
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#include <stdbool.h> |
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#include <stddef.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <getopt.h> |
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#include <xtables.h> |
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#include <fcntl.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include "ts3init_random_seed.h" |
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#include "ts3init_match.h" |
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#define param_act(t, s, f) xtables_param_act((t), "ts3init", (s), (f)) |
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) |
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static void ts3init_help(void) |
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{ |
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printf( |
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"ts3init match options:\n" |
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" --client Match ts3init client packets.\n" |
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" --server Match ts3init server packets.\n" |
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" --command <command> Match packets with the specified command.\n" |
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); |
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} |
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static const struct option ts3init_opts[] = { |
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{.name = "client", .has_arg = false, .val = '1'}, |
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{.name = "server", .has_arg = false, .val = '2'}, |
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{.name = "command", .has_arg = true, .val = '3'}, |
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{NULL}, |
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}; |
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static int ts3init_parse(int c, char **argv, int invert, unsigned int *flags, |
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const void *entry, struct xt_entry_match **match) |
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{ |
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struct xt_ts3init_mtinfo *info = (void *)(*match)->data; |
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int command; |
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switch (c) { |
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case '1': |
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param_act(XTF_ONLY_ONCE, "--client", info->specific_options & CHK_TS3INIT_CLIENT); |
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param_act(XTF_NO_INVERT, "--client", invert); |
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info->specific_options |= CHK_TS3INIT_CLIENT; |
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*flags |= CHK_TS3INIT_CLIENT; |
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return true; |
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case '2': |
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param_act(XTF_ONLY_ONCE, "--server", info->specific_options & CHK_TS3INIT_SERVER); |
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param_act(XTF_NO_INVERT, "--server", invert); |
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info->specific_options |= CHK_TS3INIT_SERVER; |
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*flags |= CHK_TS3INIT_SERVER; |
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return true; |
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case '3': |
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param_act(XTF_ONLY_ONCE, "--random-seed", info->specific_options & CHK_TS3INIT_COMMAND); |
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param_act(XTF_NO_INVERT, "--random-seed", invert); |
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command = atoi(optarg); |
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if (command < 0 || command > 255) |
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xtables_error(PARAMETER_PROBLEM, |
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"ts3init: invalid command number"); |
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info->specific_options |= CHK_TS3INIT_COMMAND; |
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info->command = (__u8)command; |
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*flags |= CHK_TS3INIT_COMMAND; |
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return true; |
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default: |
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return false; |
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} |
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} |
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static void ts3init_save(const void *ip, const struct xt_entry_match *match) |
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{ |
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const struct xt_ts3init_mtinfo *info = (const void *)match->data; |
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if (info->specific_options & CHK_TS3INIT_CLIENT) |
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{ |
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printf("--client "); |
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} |
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if (info->specific_options & CHK_TS3INIT_SERVER) |
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{ |
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printf("--server "); |
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} |
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if (info->specific_options & CHK_TS3INIT_COMMAND) |
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{ |
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printf("--command %i ", (int)info->command); |
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} |
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} |
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static void ts3init_print(const void *ip, const struct xt_entry_match *match, |
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int numeric) |
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{ |
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printf(" -m ts3init "); |
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ts3init_save(ip, match); |
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} |
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static void ts3init_check(unsigned int flags) |
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{ |
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bool client = flags & CHK_TS3INIT_CLIENT; |
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bool server = flags & CHK_TS3INIT_SERVER; |
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if (client && server) |
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{ |
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xtables_error(PARAMETER_PROBLEM, |
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"ts3init_: --client and --server can not be specified at the same time"); |
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} |
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if (flags & CHK_TS3INIT_COMMAND) |
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{ |
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if (!client && !server) |
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{ |
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xtables_error(PARAMETER_PROBLEM, |
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"ts3init: --command requires either --client or --server"); |
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} |
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} |
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} |
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/* register and init */ |
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static struct xtables_match ts3init_mt_reg[] = |
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{ |
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{ |
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.name = "ts3init", |
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.revision = 0, |
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.family = NFPROTO_UNSPEC, |
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.version = XTABLES_VERSION, |
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.size = XT_ALIGN(sizeof(struct xt_ts3init_mtinfo)), |
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.userspacesize = XT_ALIGN(sizeof(struct xt_ts3init_mtinfo)), |
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.help = ts3init_help, |
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.parse = ts3init_parse, |
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.print = ts3init_print, |
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.save = ts3init_save, |
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.extra_opts = ts3init_opts, |
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.final_check = ts3init_check, |
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}, |
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}; |
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static __attribute__((constructor)) void ts3init_mt_ldr(void) |
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{ |
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xtables_register_matches(ts3init_mt_reg, ARRAY_SIZE(ts3init_mt_reg)); |
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} |
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