mirror of
git://git.code.sf.net/p/xtables-addons/xtables-addons
synced 2025-09-06 12:45:13 +02:00
88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
/* Shared library add-on to iptables for condition match */
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#include <stdbool.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 "xt_condition.h"
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static void condition_help(void)
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{
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printf("condition match options:\n"
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"--condition [!] filename "
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"Match on boolean value stored in /proc file\n");
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}
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static const struct option condition_opts[] = {
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{.name = "condition", .has_arg = true, .val = 'X'},
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{NULL},
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};
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static int condition_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_condition_mtinfo *info = (void *)(*match)->data;
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if (c == 'X') {
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if (*flags)
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exit_error(PARAMETER_PROBLEM,
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"Can't specify multiple conditions");
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check_inverse(optarg, &invert, &optind, 0);
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if (strlen(optarg) < sizeof(info->name))
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strcpy(info->name, optarg);
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else
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exit_error(PARAMETER_PROBLEM,
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"File name too long");
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info->invert = invert;
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*flags = 1;
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return true;
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}
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return false;
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}
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static void condition_check(unsigned int flags)
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{
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if (flags == 0)
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exit_error(PARAMETER_PROBLEM,
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"Condition match: must specify --condition");
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}
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static void condition_print(const void *ip, const struct xt_entry_match *match,
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int numeric)
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{
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const struct xt_condition_mtinfo *info = (const void *)match->data;
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printf("condition %s%s ", (info->invert) ? "!" : "", info->name);
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}
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static void condition_save(const void *ip, const struct xt_entry_match *match)
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{
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const struct xt_condition_mtinfo *info = (const void *)match->data;
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printf("--condition %s\"%s\" ", (info->invert) ? "! " : "", info->name);
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}
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static struct xtables_match condition_match = {
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.name = "condition",
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.version = XTABLES_VERSION,
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.size = XT_ALIGN(sizeof(struct xt_condition_mtinfo)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_condition_mtinfo)),
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.help = condition_help,
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.parse = condition_parse,
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.final_check = condition_check,
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.print = condition_print,
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.save = condition_save,
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.extra_opts = condition_opts,
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};
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static void _init(void)
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{
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xtables_register_match(&condition_match);
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}
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