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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 <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include "datatypes.h"
#include "tcp.h"
#include "log.h"
char* tcp_endpoint_to_string(tcp_endpoint_t e)
{
void* ptr;
u_int16_t port;
size_t addrstr_len = 0;
char* addrstr, *ret;
char addrport_sep = ':';
switch(((struct sockaddr *)&e)->sa_family)
{
case AF_INET:
ptr = &((struct sockaddr_in *)&e)->sin_addr;
port = ntohs(((struct sockaddr_in *)&e)->sin_port);
addrstr_len = INET_ADDRSTRLEN + 1;
addrport_sep = ':';
break;
case AF_INET6:
ptr = &((struct sockaddr_in6 *)&e)->sin6_addr;
port = ntohs(((struct sockaddr_in6 *)&e)->sin6_port);
addrstr_len = INET6_ADDRSTRLEN + 1;
addrport_sep = '.';
break;
default:
asprintf(&ret, "unknown address type");
return ret;
}
addrstr = malloc(addrstr_len);
if(!addrstr)
return NULL;
inet_ntop (((struct sockaddr *)&e)->sa_family, ptr, addrstr, addrstr_len);
asprintf(&ret, "%s%c%d", addrstr, addrport_sep ,port);
free(addrstr);
return ret;
}
struct addrinfo* tcp_resolve_endpoint(const char* addr, const char* port, resolv_type_t rt)
{
struct addrinfo hints, *res;
res = NULL;
memset (&hints, 0, sizeof (hints));
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
switch(rt) {
case IPV4_ONLY: hints.ai_family = AF_INET; break;
case IPV6_ONLY: hints.ai_family = AF_INET6; break;
default: hints.ai_family = AF_UNSPEC; break;
}
int errcode = getaddrinfo(addr, port, &hints, &res);
if (errcode != 0) {
log_printf(ERROR, "Error resolving local address (%s:%s): %s", (addr) ? addr : "*", port, gai_strerror(errcode));
return NULL;
}
if(!res) {
log_printf(ERROR, "getaddrinfo returned no address for %s:%s", addr, port);
return NULL;
}
return res;
}
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