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/*
* �Anytun
*
* �Anytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation �Anytun has no support for multiple connections
* or synchronisation. It is a small single threaded implementation intended
* to act as a client on small platforms.
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methodes used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2008 Christian Pointner <equinox@anytun.org>
*
* This file is part of �Anytun.
*
* �Anytun is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* �Anytun 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 �Anytun. If not, see <http://www.gnu.org/licenses/>.
*/
#include "datatypes.h"
#include "udp.h"
#include "log.h"
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <netinet/in.h>
void udp_init(udp_socket_t** sock, const char* local_addr, const char* port)
{
if(!sock || !port)
return;
*sock = malloc(sizeof(udp_socket_t));
if(!*sock)
return;
memset(&((*sock)->local_end_), 0, sizeof((*sock)->local_end_));
memset(&((*sock)->remote_end_), 0, sizeof((*sock)->local_end_));
struct addrinfo hints, *res;
memset (&hints, 0, sizeof (hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags |= AI_PASSIVE;
int errcode = getaddrinfo(local_addr, port, &hints, &res);
if (errcode != 0) {
log_printf(ERR, "Error resolving local address: %s", gai_strerror(errcode));
free(*sock);
*sock = NULL;
return;
}
memcpy(&((*sock)->local_end_), res->ai_addr, sizeof(*(res->ai_addr)));
(*sock)->fd_ = socket(res->ai_family, SOCK_DGRAM, 0);
if((*sock)->fd_ < 0) {
log_printf(ERR, "Error on opening udp socket: %m");
free(*sock);
*sock = NULL;
return;
}
errcode = bind((*sock)->fd_, res->ai_addr, res->ai_addrlen);
if(errcode) {
log_printf(ERR, "Error on binding udp socket: %m");
free(*sock);
*sock = NULL;
return;
}
freeaddrinfo(res);
}
void udp_set_remote(udp_socket_t* sock, const char* remote_addr, const char* port)
{
if(!sock || !remote_addr || !port)
return;
struct addrinfo hints, *res;
memset (&hints, 0, sizeof (hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
int errcode = getaddrinfo(remote_addr, port, &hints, &res);
if (errcode != 0) {
log_printf(ERR, "Error resolving remote address: %s", gai_strerror(errcode));
return;
}
memcpy(&(sock->remote_end_), res->ai_addr, sizeof(*(res->ai_addr)));
freeaddrinfo(res);
}
void udp_close(udp_socket_t** sock)
{
if(!sock || !(*sock))
return;
if((*sock)->fd_ > 0)
close((*sock)->fd_);
free(*sock);
*sock = NULL;
}
char* udp_endpoint_to_string(udp_endpoint_t e)
{
void* ptr;
u_int16_t port;
size_t addrstr_len = 0;
char* addrstr;
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;
break;
case AF_INET6:
ptr = &((struct sockaddr_in6 *)&e)->sin6_addr;
port = ntohs(((struct sockaddr_in6 *)&e)->sin6_port);
addrstr_len = INET6_ADDRSTRLEN + 1;
break;
default:
return "";
}
addrstr = malloc(addrstr_len);
if(!addrstr)
return NULL;
inet_ntop (((struct sockaddr *)&e)->sa_family, ptr, addrstr, addrstr_len);
char* ret;
asprintf(&ret, "%s:%d", addrstr, port);
free(addrstr);
return ret;
}
char* udp_get_local_end_string(udp_socket_t* sock)
{
if(!sock)
return "";
return udp_endpoint_to_string(sock->local_end_);
}
char* udp_get_remote_end_string(udp_socket_t* sock)
{
if(!sock)
return "";
return udp_endpoint_to_string(sock->remote_end_);
}
int udp_read(udp_socket_t* sock, u_int8_t* buf, u_int32_t len, udp_endpoint_t* remote_end)
{
if(!sock || !remote_end)
return -1;
int socklen = sizeof(*remote_end);
return recvfrom(sock->fd_, buf, len, 0, (struct sockaddr *)remote_end, &socklen);
}
int udp_write(udp_socket_t* sock, u_int8_t* buf, u_int32_t len)
{
if(!sock)
return -1;
return sendto(sock->fd_, buf, len, 0, (struct sockaddr *)&(sock->remote_end_), sizeof(sock->remote_end_));;
}
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