* 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
+ * message authentication based on the methods 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>
+ *
+ * Copyright (C) 2007-2014 Christian Pointner <equinox@anytun.org>
*
* This file is part of uAnytun.
*
*
* You should have received a copy of the GNU General Public License
* along with uAnytun. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL. If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so. If you
+ * do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source
+ * files in the program, then also delete it here.
*/
+#define _GNU_SOURCE
+#include <stdio.h>
+
#include "datatypes.h"
#include "udp.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;
+#ifndef AI_ADDRCONFIG
+#define AI_ADDRCONFIG 0
+#endif
+static int udp_resolv_local(udp_t* sock, const char* local_addr, const char* port, resolv_addr_type_t resolv_type, unsigned int* idx)
+{
struct addrinfo hints, *res;
res = NULL;
memset (&hints, 0, sizeof (hints));
hints.ai_socktype = SOCK_DGRAM;
- hints.ai_flags |= AI_PASSIVE;
+ hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
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;
+ 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(local_addr, port, &hints, &res);
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);
+ struct addrinfo* r = res;
+ udp_socket_t* prev_sock = sock->socks_;
+ while(prev_sock && prev_sock->next_) prev_sock = prev_sock->next_;
+ while(r) {
+ udp_socket_t* new_sock = malloc(sizeof(udp_socket_t));
+ if(!new_sock) {
+ log_printf(ERROR, "memory error at udp_init");
+ freeaddrinfo(res);
+ udp_close(sock);
+ return -2;
+ }
+ memset(&(new_sock->local_end_.addr_), 0, sizeof(new_sock->local_end_.addr_));
+ new_sock->local_end_.len_ = sizeof(new_sock->local_end_.addr_);
+ memset(&(new_sock->remote_end_.addr_), 0, sizeof(new_sock->remote_end_.addr_));
+ new_sock->remote_end_.len_ = sizeof(new_sock->remote_end_.addr_);
+ new_sock->remote_end_set_ = 0;
+ new_sock->next_ = NULL;
+ new_sock->idx_ = (*idx)++;
+
+ if(!sock->socks_) {
+ sock->socks_ = new_sock;
+ prev_sock = new_sock;
+ }
+ else {
+ prev_sock->next_ = new_sock;
+ prev_sock = new_sock;
+ }
+
+ memcpy(&(new_sock->local_end_.addr_), r->ai_addr, r->ai_addrlen);
+ new_sock->local_end_.len_ = r->ai_addrlen;
+ new_sock->fd_ = socket(new_sock->local_end_.addr_.ss_family, SOCK_DGRAM, 0);
+ if(new_sock->fd_ < 0) {
+ log_printf(ERROR, "Error on opening udp socket: %s", strerror(errno));
+ freeaddrinfo(res);
+ udp_close(sock);
+ return -1;
+ }
+
+ if(r->ai_family == AF_INET6) {
+ int on = 1;
+ if(setsockopt(new_sock->fd_, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)))
+ log_printf(ERROR, "Error on setting IPV6_V6ONLY socket option: %s", strerror(errno));
+ }
+
+ errcode = bind(new_sock->fd_, (struct sockaddr*)&(new_sock->local_end_.addr_), new_sock->local_end_.len_);
+ if(errcode) {
+ log_printf(ERROR, "Error on binding udp socket: %s", strerror(errno));
+ freeaddrinfo(res);
+ udp_close(sock);
+ return -1;
+ }
+
+ char* local_string = udp_endpoint_to_string(&(new_sock->local_end_));
+ if(local_string) {
+ log_printf(NOTICE, "socket[%d] listening on: %s", new_sock->idx_, local_string);
+ free(local_string);
+ }
+
+ r = r->ai_next;
+ }
- 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);
+ freeaddrinfo(res);
+ return 0;
+}
+
+int udp_init(udp_t* sock, const char* local_addr, const char* port, resolv_addr_type_t resolv_type)
+{
+ if(!sock || !port)
return -1;
+
+ sock->socks_ = NULL;
+ sock->active_sock_ = NULL;
+
+ unsigned int idx = 0;
+ int ret = udp_resolv_local(sock, local_addr, port, resolv_type, &idx);
+ if(ret)
+ return ret;
+
+ return 0;
+}
+
+int udp_fill_fd_set(udp_t* sock, fd_set* set)
+{
+ int max_fd = 0;
+
+ udp_socket_t* s = sock->socks_;
+ while(s) {
+ FD_SET(s->fd_, set);
+ max_fd = s->fd_ > max_fd ? s->fd_ : max_fd;
+ s = s->next_;
}
- 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;
+ return max_fd;
+}
+
+int udp_has_remote(udp_t* sock)
+{
+ if(!sock->active_sock_ || !sock->active_sock_->remote_end_set_)
+ return 0;
+
+ udp_socket_t* s = sock->socks_;
+ while(s) {
+ if(s->remote_end_set_)
+ return 1;
+ s = s->next_;
}
-
-/* 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)
+int udp_resolv_remote(udp_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;
+ if(!sock || !remote_addr || !port)
+ return -1;
+
res = NULL;
memset (&hints, 0, sizeof (hints));
hints.ai_socktype = SOCK_DGRAM;
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;
+
+ int found = 0;
+ struct addrinfo* r = res;
+ while(r) {
+ udp_socket_t* s = sock->socks_;
+ while(s) {
+ if(s->local_end_.addr_.ss_family == r->ai_family && !(s->remote_end_set_)) {
+ sock->active_sock_ = s;
+ break;
+ }
+ s = s->next_;
+ }
+
+ if(s) {
+ memcpy(&(s->remote_end_.addr_), r->ai_addr, r->ai_addrlen);
+ s->remote_end_.len_ = r->ai_addrlen;
+ s->remote_end_set_ = 1;
+ found = 1;
+ char* remote_string = udp_endpoint_to_string(&(s->remote_end_));
+ if(remote_string) {
+ log_printf(NOTICE, "socket[%d] set remote end to: %s", s->idx_, remote_string);
+ free(remote_string);
+ }
+ break;
+ }
+
+ r = r->ai_next;
+ }
freeaddrinfo(res);
+ if(!found)
+ log_printf(WARNING, "no remote address for '%s' found that fits any of the local address families", remote_addr);
+
return 0;
}
-void udp_close(udp_socket_t* sock)
+void udp_update_remote(udp_t* sock, int fd, udp_endpoint_t* remote)
{
if(!sock)
return;
- if(sock->fd_ > 0)
- close(sock->fd_);
-}
+ if(!(sock->active_sock_) || sock->active_sock_->fd_ != fd) {
+ udp_socket_t* s = sock->socks_;
+ while(s) {
+ if(s->fd_ == fd) {
+ sock->active_sock_ = s;
+ break;
+ }
+ s = s->next_;
+ }
+ }
-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 = ':';
+ if(!remote)
+ return;
- 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 ;
+ if(sock->active_sock_) {
+ if(remote->len_ != sock->active_sock_->remote_end_.len_ ||
+ memcmp(&(remote->addr_), &(sock->active_sock_->remote_end_.addr_), remote->len_)) {
+ memcpy(&(sock->active_sock_->remote_end_.addr_), &(remote->addr_), remote->len_);
+ sock->active_sock_->remote_end_.len_ = remote->len_;
+ sock->active_sock_->remote_end_set_ = 1;
+ char* addrstring = udp_endpoint_to_string(remote);
+ log_printf(NOTICE, "socket[%d] autodetected remote host changed %s", sock->active_sock_->idx_, addrstring);
+ free(addrstring);
+ }
}
- 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)
+void udp_close(udp_t* sock)
{
if(!sock)
- return NULL;
+ return;
- return udp_endpoint_to_string(sock->local_end_);
+ while(sock->socks_) {
+ if(sock->socks_->fd_ > 0)
+ close(sock->socks_->fd_);
+
+ udp_socket_t*s = sock->socks_;
+ sock->socks_ = sock->socks_->next_;
+
+ free(s);
+ }
+ sock->socks_ = NULL;
+ sock->active_sock_ = NULL;
}
-char* udp_get_remote_end_string(udp_socket_t* sock)
+char* udp_endpoint_to_string(udp_endpoint_t* e)
{
- if(!sock || !sock->remote_end_set_)
- return NULL;
+ if(!e)
+ return strdup("<null>");
+
+ char addrstr[INET6_ADDRSTRLEN + 1], portstr[6], *ret;
+ char addrport_sep = ':';
+
+ switch(e->addr_.ss_family)
+ {
+ case AF_INET: addrport_sep = ':'; break;
+ case AF_INET6: addrport_sep = '.'; break;
+ case AF_UNSPEC: return NULL;
+ default: return strdup("<unknown address type>");
+ }
- return udp_endpoint_to_string(sock->remote_end_);
+ int errcode = getnameinfo((struct sockaddr *)&(e->addr_), e->len_, addrstr, sizeof(addrstr), portstr, sizeof(portstr), NI_NUMERICHOST | NI_NUMERICSERV);
+ if (errcode != 0) return NULL;
+ int len = asprintf(&ret, "%s%c%s", addrstr, addrport_sep ,portstr);
+ if(len == -1) return NULL;
+ return ret;
}
-
-int udp_read(udp_socket_t* sock, u_int8_t* buf, u_int32_t len, udp_endpoint_t* remote_end)
+
+
+int udp_read(udp_t* sock, int fd, u_int8_t* buf, u_int32_t len, udp_endpoint_t* remote_end)
{
- if(!sock || !remote_end)
+ if(!sock || !buf || !remote_end)
return -1;
- socklen_t socklen = sizeof(*remote_end);
- return recvfrom(sock->fd_, buf, len, 0, (struct sockaddr *)remote_end, &socklen);
+ return recvfrom(fd, buf, len, 0, (struct sockaddr *)&(remote_end->addr_), &(remote_end->len_));
}
-int udp_write(udp_socket_t* sock, u_int8_t* buf, u_int32_t len)
+
+int udp_write(udp_t* sock, u_int8_t* buf, u_int32_t len)
{
- if(!sock || !sock->remote_end_set_)
- return -1;
+ if(!sock || !buf || !sock->active_sock_ || !sock->active_sock_->remote_end_set_)
+ return 0;
- 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);;
+ return sendto(sock->active_sock_->fd_, buf, len, 0, (struct sockaddr *)&(sock->active_sock_->remote_end_.addr_), sock->active_sock_->remote_end_.len_);
}
-
projects / debian / uanytun.git / blobdiff