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/*
* uAnytun
*
* uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation uAnytun 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 uAnytun.
*
* uAnytun 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.
*
* uAnytun 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 uAnytun. If not, see <http://www.gnu.org/licenses/>.
*/
#include "datatypes.h"
#include "udp.h"
#include "log.h"
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
int udp_init(udp_socket_t* sock, const char* local_addr, const char* port, resolv_addr_type_t resolv_type)
{
if(!sock || !port)
return -1;
sock->fd_ = 0;
memset(&(sock->local_end_), 0, sizeof(sock->local_end_));
memset(&(sock->remote_end_), 0, sizeof(sock->local_end_));
sock->remote_end_set_ = 0;
struct addrinfo hints, *res;
res = NULL;
memset (&hints, 0, sizeof (hints));
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags |= AI_PASSIVE;
switch(resolv_type) {
case IPV4_ONLY: hints.ai_family = PF_INET; break;
case IPV6_ONLY: hints.ai_family = PF_INET6; break;
default: hints.ai_family = PF_UNSPEC; break;
}
int errcode = getaddrinfo(local_addr, port, &hints, &res);
if (errcode != 0) {
log_printf(ERROR, "Error resolving local address (%s:%s): %s", (local_addr) ? local_addr : "*", port, gai_strerror(errcode));
udp_close(sock);
return -1;
}
if(!res) {
udp_close(sock);
log_printf(ERROR, "getaddrinfo returned no address for %s:%s", local_addr, port);
return -1;
}
memcpy(&(sock->local_end_), res->ai_addr, res->ai_addrlen);
sock->fd_ = socket(res->ai_family, SOCK_DGRAM, 0);
if(sock->fd_ < 0) {
log_printf(ERROR, "Error on opening udp socket: %s", strerror(errno));
freeaddrinfo(res);
udp_close(sock);
return -1;
}
errcode = bind(sock->fd_, res->ai_addr, res->ai_addrlen);
if(errcode) {
log_printf(ERROR, "Error on binding udp socket: %s", strerror(errno));
freeaddrinfo(res);
udp_close(sock);
return -1;
}
/* this doesn't work on linux ?? */
/* #ifdef NO_V4MAPPED */
/* if(res->ai_family == AF_INET6) { */
/* log_printf(NOTICE, "disabling V4-Mapped addresses"); */
/* int on = 1; */
/* if(setsockopt(sock->fd_, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on))) */
/* log_printf(ERROR, "Error on setting IPV6_V6ONLY socket option: %s", strerror(errno)); */
/* } */
/* #endif */
freeaddrinfo(res);
return 0;
}
int udp_set_remote(udp_socket_t* sock, const char* remote_addr, const char* port, resolv_addr_type_t resolv_type)
{
if(!sock || !remote_addr || !port)
return -1;
struct addrinfo hints, *res;
res = NULL;
memset (&hints, 0, sizeof (hints));
hints.ai_socktype = SOCK_DGRAM;
switch(resolv_type) {
case IPV4_ONLY: hints.ai_family = PF_INET; break;
case IPV6_ONLY: hints.ai_family = PF_INET6; break;
default: hints.ai_family = PF_UNSPEC; break;
}
int errcode = getaddrinfo(remote_addr, port, &hints, &res);
if (errcode != 0) {
log_printf(ERROR, "Error resolving remote address (%s:%s): %s", (remote_addr) ? remote_addr : "*", port, gai_strerror(errcode));
return -1;
}
if(!res) {
log_printf(ERROR, "getaddrinfo returned no address for %s:%s", remote_addr, port);
return -1;
}
memcpy(&(sock->remote_end_), res->ai_addr, res->ai_addrlen);
sock->remote_end_set_ = 1;
freeaddrinfo(res);
return 0;
}
void udp_close(udp_socket_t* sock)
{
if(!sock)
return;
if(sock->fd_ > 0)
close(sock->fd_);
}
char* udp_endpoint_to_string(udp_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 ;
}
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;
}
char* udp_get_local_end_string(udp_socket_t* sock)
{
if(!sock)
return NULL;
return udp_endpoint_to_string(sock->local_end_);
}
char* udp_get_remote_end_string(udp_socket_t* sock)
{
if(!sock || !sock->remote_end_set_)
return NULL;
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;
socklen_t 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;
socklen_t socklen = sizeof(sock->remote_end_);
#ifdef NO_V4MAPPED
if((((struct sockaddr *)&sock->local_end_)->sa_family) == AF_INET)
socklen = sizeof(struct sockaddr_in);
else if ((((struct sockaddr *)&sock->local_end_)->sa_family) == AF_INET6)
socklen = sizeof(struct sockaddr_in6);
#endif
return sendto(sock->fd_, buf, len, 0, (struct sockaddr *)&(sock->remote_end_), socklen);;
}
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