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/*
* tcpproxy
*
* tcpproxy is a simple tcp connection proxy which combines the
* features of rinetd and 6tunnel. tcpproxy supports IPv4 and
* IPv6 and also supports connections from IPv6 to IPv4
* endpoints and vice versa.
*
*
* Copyright (C) 2010-2011 Christian Pointner <equinox@spreadspace.org>
*
* This file is part of tcpproxy.
*
* tcpproxy is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* tcpproxy is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with tcpproxy. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include "listener.h"
#include "tcp.h"
#include "log.h"
void listener_delete_element(void* e)
{
if(!e)
return;
listener_t* element = (listener_t*)e;
close(element->fd_);
free(e);
}
int listener_init(listeners_t* list)
{
return slist_init(list, &listener_delete_element);
}
void listener_clear(listeners_t* list)
{
slist_clear(list);
}
int listener_add(listeners_t* list, const char* laddr, const char* lport, const char* raddr, const char* rport)
{
if(!list)
return -1;
// TODO: what if more than one address is returned here?
struct addrinfo* re = tcp_resolve_endpoint(raddr, rport, ANY);
if(!re)
return -1;
struct addrinfo* le = tcp_resolve_endpoint(laddr, lport, ANY);
if(!le) {
freeaddrinfo(re);
return -1;
}
struct addrinfo* l = le;
int ret = 0;
while(l) {
listener_t* element = malloc(sizeof(listener_t));
if(!element) {
ret = -2;
break;
}
memset(&(element->remote_end_), 0, sizeof(element->remote_end_));
memcpy(&(element->remote_end_), re->ai_addr, re->ai_addrlen);
memset(&(element->local_end_), 0, sizeof(element->local_end_));
memcpy(&(element->local_end_), l->ai_addr, l->ai_addrlen);
element->fd_ = socket(l->ai_family, SOCK_STREAM, 0);
if(element->fd_ < 0) {
log_printf(ERROR, "Error on opening tcp socket: %s", strerror(errno));
free(element);
ret = -1;
break;
}
if(l->ai_family == AF_INET6) {
int on = 1;
if(setsockopt(element->fd_, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)))
log_printf(WARNING, "failed to set IPV6_V6ONLY socket option: %s", strerror(errno));
}
ret = bind(element->fd_, l->ai_addr, l->ai_addrlen);
if(ret) {
log_printf(ERROR, "Error on bind(): %s", strerror(errno));
close(element->fd_);
free(element);
break;
}
ret = listen(element->fd_, 0);
if(ret) {
log_printf(ERROR, "Error on listen(): %s", strerror(errno));
close(element->fd_);
free(element);
break;
}
char* ls = tcp_endpoint_to_string(element->local_end_);
char* rs = tcp_endpoint_to_string(element->remote_end_);
log_printf(NOTICE, "listening on: %s (remote: %s)", ls ? ls:"(null)", rs ? rs:"(null)");
if(ls) free(ls);
if(rs) free(rs);
if(slist_add(list, element) == NULL) {
close(element->fd_);
free(element);
ret = -2;
break;
}
l = l->ai_next;
}
freeaddrinfo(re);
freeaddrinfo(le);
return ret;
}
void listener_remove(listeners_t* list, int fd)
{
slist_remove(list, listener_find(list, fd));
}
listener_t* listener_find(listeners_t* list, int fd)
{
if(!list)
return NULL;
slist_element_t* tmp = list->first_;
while(tmp) {
listener_t* l = (listener_t*)tmp->data_;
if(l && l->fd_ == fd)
return l;
tmp = tmp->next_;
}
return NULL;
}
void listener_print(listeners_t* list)
{
if(!list)
return;
slist_element_t* tmp = list->first_;
while(tmp) {
listener_t* l = (listener_t*)tmp->data_;
if(l) {
char* ls = tcp_endpoint_to_string(l->local_end_);
char* rs = tcp_endpoint_to_string(l->remote_end_);
printf("listener #%d: %s -> %s\n", l->fd_, ls ? ls : "(null)", rs ? rs : "(null)");
if(ls) free(ls);
if(rs) free(rs);
}
tmp = tmp->next_;
}
}
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