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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, "--command", info->specific_options & CHK_TS3INIT_COMMAND);
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param_act(XTF_NO_INVERT, "--command", 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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