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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <iptables.h>
#include<linux/netfilter_ipv4/ip_tables.h>
#include<linux/netfilter_ipv4/ipt_condition.h>
static void help(void)
{
printf("condition match v%s options:\n"
"--condition [!] filename Match on boolean value stored in /proc file"
"\n", IPTABLES_VERSION);
}
static struct option opts[] = { { "condition", 1, 0, 'X' }, { 0 } };
static void init(struct ipt_entry_match *m, unsigned int *nfcache)
{
*nfcache |= NFC_UNKNOWN;
}
static int parse(int c, char **argv, int invert, unsigned int *flags,
const struct ipt_entry *entry, unsigned int *nfcache,
struct ipt_entry_match **match)
{
struct condition_info *info = (struct condition_info*)(*match)->data;
check_inverse(optarg, &invert, &optind, 0);
if(*flags)
exit_error(PARAMETER_PROBLEM, "Can't specify multiple conditions");
if(c == 'X')
{
if(strlen(argv[optind-1]) < VARIABLE_NAME_LEN)
strcpy(info->name, argv[optind-1]);
else
exit_error(PARAMETER_PROBLEM, "File name too long");
info->invert = invert;
*flags = 1;
return 1;
}
return 0;
}
static void final_check(unsigned int flags)
{
if(!flags)
exit_error(PARAMETER_PROBLEM, "Condition match: must specify --condition");
}
static void print(const struct ipt_ip *ip,
const struct ipt_entry_match *match, int numeric)
{
const struct condition_info *info = (const struct condition_info*)match->data;
printf("condition %s%s ", (info->invert) ? "!" : "", info->name);
}
static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
{
const struct condition_info *info = (const struct condition_info*)match->data;
printf("--condition %s%s ", (info->invert) ? "! " : "", info->name);
}
static struct iptables_match condition = {
NULL,
"condition",
IPTABLES_VERSION,
IPT_ALIGN(sizeof(struct condition_info)),
IPT_ALIGN(sizeof(struct condition_info)),
&help,
&init,
&parse,
&final_check,
&print,
&save,
opts
};
void _init(void)
{
register_match(&condition);
}
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