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/*
Tomato Firmware
Copyright (C) 2006-2009 Jonathan Zarate
*/
#include "rc.h"
#include <arpa/inet.h>
static const char tcpudp[2][4] = {"tcp", "udp"};
void ipt_forward(ipt_table_t table)
{
char *nv, *nvp, *b;
const char *proto, *saddr, *xports, *iport, *iaddr;
const char *c;
const char *mdport;
int i;
char ip[64];
char src[64];
nvp = nv = strdup(nvram_safe_get("portforward"));
if (!nv) return;
while ((b = strsep(&nvp, ">")) != NULL) {
/*
[<1.01] 1<3<30,40-45<60<5<desc
[<1.07] 1<3<30,40-45<60<192.168.1.5<desc
1<3<71.72.73.74<30,40-45<60<192.168.1.5<desc
1 = enabled
3 = tcp & udp
71.72.73.74 = src addr
30,40-45 = ext port
60 = int port
192.168.1.5 = dst addr
desc = desc
*/
if ((vstrsep(b, "<", &c, &proto, &saddr, &xports, &iport, &iaddr) != 6) || (*c != '1')) continue;
src[0] = 0;
if (*saddr != 0) {
if (strchr(saddr, '.') == NULL) {
// <1.07
iaddr = iport;
iport = xports;
xports = saddr;
saddr = "";
}
else if (strlen(saddr) < 32) {
sprintf(src, "-%s %s", strchr(saddr, '-') ? "m iprange --src-range" : "s", saddr);
}
}
mdport = (strchr(xports, ',') != NULL) ? "-m mport --dports" : "--dport";
for (i = 0; i < 2; ++i) {
if ((1 << i) & (*proto - '0')) {
c = tcpudp[i];
if (strchr(iaddr, '.')) {
strlcpy(ip, iaddr, sizeof(ip));
}
else {
// < 1.01: 5 -> 192.168.1.5
strcpy(ip, lan_cclass);
strlcat(ip, iaddr, sizeof(ip));
}
if (table == IPT_TABLE_NAT) {
ipt_write("-A PREROUTING -p %s %s -d %s %s %s -j DNAT --to-destination %s%s%s\n",
c,
src,
wanaddr,
mdport, xports,
ip, *iport ? ":" : "", iport);
if (nvram_get_int("nf_loopback") == 1) {
ipt_write("-A POSTROUTING -p %s %s %s -s %s/%s -d %s -j SNAT --to-source %s\n",
c,
mdport, *iport ? iport : xports,
nvram_safe_get("lan_ipaddr"), // corrected by ipt
nvram_safe_get("lan_netmask"),
ip,
nvram_safe_get("wan_ipaddr"));
}
}
else { // filter
ipt_write("-A wanin %s -p %s -m %s -d %s %s %s -j %s\n",
src,
c,
c,
ip,
mdport, *iport ? iport : xports,
chain_in_accept);
}
}
}
}
free(nv);
}
void ipt_triggered(ipt_table_t table)
{
char *nv, *nvp, *b;
const char *proto, *mports, *fports;
const char *c;
char *p;
int i;
int first;
char s[256];
nvp = nv = strdup(nvram_safe_get("trigforward"));
if (!nv) return;
first = 1;
while ((b = strsep(&nvp, ">")) != NULL) {
if ((vstrsep(b, "<", &c, &proto, &mports, &fports) != 4) || (*c != '1')) continue;
for (i = 0; i < 2; ++i) {
if ((1 << i) & (*proto - '0')) {
if (first) {
// should only be created if there is at least one enabled
if (table == IPT_TABLE_NAT) {
ipt_write("-A PREROUTING -d %s -j TRIGGER --trigger-type dnat\n", wanaddr);
goto QUIT;
}
ipt_write(":triggers - [0:0]\n"
"-A wanout -j triggers\n"
"-A wanin -j TRIGGER --trigger-type in\n");
first = 0;
}
strlcpy(s, mports, sizeof(s));
if ((p = strchr(s, ':')) != NULL) *p = '-';
if ((p = strchr(fports, ':')) != NULL) *p = '-';
c = tcpudp[i];
ipt_write("-A triggers -p %s -m %s --dport %s "
"-j TRIGGER --trigger-type out --trigger-proto %s --trigger-match %s --trigger-relate %s\n",
c, c, mports,
c, s, fports);
// can't use mport... trigger-match must be set to the same
// ports as dport since it's used to refresh timer during inbound -- zzz
}
}
}
QUIT:
free(nv);
}
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