103 lines
2.1 KiB
C
103 lines
2.1 KiB
C
#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 <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/netfilter_ipv4/ipt_workshop.h>
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static void help(void)
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{
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printf(
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"workshop match v%s options:\n"
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" --ttl TTL value\n"
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, IPTABLES_VERSION);
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}
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static void init(struct ipt_entry_match *m, unsigned int *nfcache)
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{
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/* caching not implemented yet */
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*nfcache |= NFC_UNKNOWN;
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}
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static int parse(int c, char **argv, int invert, unsigned int *flags,
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const struct ipt_entry *entry, unsigned int *nfcache,
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struct ipt_entry_match **match)
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{
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struct ipt_ws_info *info = (struct ipt_ws_info *) (*match)->data;
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check_inverse(optarg, &invert, &optind, 0);
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if (invert)
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exit_error(PARAMETER_PROBLEM, "invert not supported");
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if (*flags)
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exit_error(PARAMETER_PROBLEM,
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"workshop: can't specify parameter twice");
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if (!optarg)
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exit_error(PARAMETER_PROBLEM,
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"workshop: you must specify a value");
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switch (c) {
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case 'z':
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info->ttl = atoi(optarg);
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/* FIXME: range 0-255 */
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*flags = 1;
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break;
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default:
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return 0;
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}
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return 1;
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}
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static void final_check(unsigned int flags)
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{
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if (!flags)
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exit_error(PARAMETER_PROBLEM,
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"workshop match: you must specify ttl");
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}
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static void print(const struct ipt_ip *ip,
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const struct ipt_entry_match *match,
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int numeric)
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{
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const struct ipt_ws_info *info = (struct ipt_ws_info *) match->data;
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printf("workshop match TTL=%u ", info->ttl);
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}
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static void save(const struct ipt_ip *ip,
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const struct ipt_entry_match *match)
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{
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const struct ipt_ws_info *info = (struct ipt_ws_info *) match->data;
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printf("--ttl %u ", info->ttl);
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}
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static struct option opts[] = {
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{ "ttl", 1, 0, 'z' },
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{ 0 }
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};
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static struct iptables_match ws = {
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.next = NULL,
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.name = "workshop",
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.version = IPTABLES_VERSION,
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.size = IPT_ALIGN(sizeof(struct ipt_ws_info)),
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.userspacesize = IPT_ALIGN(sizeof(struct ipt_ws_info)),
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.help = &help,
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.init = &init,
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.parse = &parse,
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.final_check = &final_check,
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.print = &print,
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.save = &save,
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.extra_opts = opts
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};
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void _init(void)
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{
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register_match(&ws);
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}
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