/usr/src/xtables-addons-2.12/extensions/libxt_condition.c is in xtables-addons-dkms 2.12-0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | /*
* "condition" match extension for iptables
* Stephane Ouellette <ouellettes [at] videotron ca>, 2002-10-22
* Massimiliano Hofer <max [at] nucleus it>, 2006-05-15
* Jan Engelhardt, 2008
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License; either version 2
* or 3 of the License, as published by the Free Software Foundation.
*/
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <xtables.h>
#include "xt_condition.h"
#include "compat_user.h"
static void condition_help(void)
{
printf(
"condition match options:\n"
"[!] --condition name Match on boolean value stored in procfs file\n"
);
}
static const struct option condition_opts[] = {
{.name = "condition", .has_arg = true, .val = 'X'},
{NULL},
};
static int condition_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_condition_mtinfo *info = (void *)(*match)->data;
if (c == 'X') {
if (*flags)
xtables_error(PARAMETER_PROBLEM,
"Can't specify multiple conditions");
if (strlen(optarg) < sizeof(info->name))
strcpy(info->name, optarg);
else
xtables_error(PARAMETER_PROBLEM,
"File name too long");
info->invert = invert;
*flags = 1;
return true;
}
return false;
}
static void condition_check(unsigned int flags)
{
if (flags == 0)
xtables_error(PARAMETER_PROBLEM,
"Condition match: must specify --condition");
}
static void condition_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_condition_mtinfo *info = (const void *)match->data;
printf("%s --condition \"%s\" ", info->invert ? " !" : "", info->name);
}
static void condition_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
printf(" -m condition");
condition_save(ip, match);
}
static struct xtables_match condition_mt_reg = {
.name = "condition",
.revision = 1,
.family = NFPROTO_UNSPEC,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_condition_mtinfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_condition_mtinfo)),
.help = condition_help,
.parse = condition_parse,
.final_check = condition_check,
.print = condition_print,
.save = condition_save,
.extra_opts = condition_opts,
};
static __attribute__((constructor)) void condition_mt_ldr(void)
{
xtables_register_match(&condition_mt_reg);
}
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