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#include <stdio.h>
#include <getopt.h>
#include <stdlib.h>
#include <netinet/in.h> /* For htons */
#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
#include <linux/netfilter_ipv4/ip_conntrack.h>
#include "../include/libct_proto.h"
static struct option opts[] = {
{"orig-port-src", 1, 0, '1'},
{"orig-port-dst", 1, 0, '2'},
{"reply-port-src", 1, 0, '3'},
{"reply-port-dst", 1, 0, '4'},
{0, 0, 0, 0}
};
int parse(char c, char *argv[],
struct ip_conntrack_tuple *orig,
struct ip_conntrack_tuple *reply)
{
switch(c) {
case '1':
if (optarg)
orig->src.u.udp.port = htons(atoi(optarg));
break;
case '2':
if (optarg)
orig->dst.u.udp.port = htons(atoi(optarg));
break;
case '3':
if (optarg)
reply->src.u.udp.port = htons(atoi(optarg));
break;
case '4':
if (optarg)
reply->dst.u.udp.port = htons(atoi(optarg));
break;
}
return 1;
}
void print(struct ip_conntrack_tuple *t)
{
printf("sport=%d dport=%d ", ntohs(t->src.u.udp.port),
ntohs(t->dst.u.udp.port));
}
static struct ctproto_handler udp = {
.name = "udp",
.protonum = 17,
.parse = parse,
.print = print,
.opts = opts
};
void __attribute__ ((constructor)) init(void);
void __attribute__ ((destructor)) fini(void);
void init(void)
{
register_proto(&udp);
}
void fini(void)
{
unregister_proto(&udp);
}
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