+++ /dev/null
-/*
- device.c -- multicast socket
- Copyright (C) 2002-2005 Ivo Timmermans,
- 2002-2013 Guus Sliepen <guus@tinc-vpn.org>
-
- This program 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 2 of the License, or
- (at your option) any later version.
-
- This program 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 this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-
-#include "system.h"
-
-#include "conf.h"
-#include "device.h"
-#include "net.h"
-#include "logger.h"
-#include "netutl.h"
-#include "utils.h"
-#include "route.h"
-#include "xalloc.h"
-
-static char *device_info;
-
-static struct addrinfo *ai = NULL;
-static mac_t ignore_src = {{0}};
-
-static bool setup_device(void) {
- char *host = NULL;
- char *port;
- char *space;
- int ttl = 1;
-
- device_info = "multicast socket";
-
- get_config_string(lookup_config(config_tree, "Interface"), &iface);
-
- if(!get_config_string(lookup_config(config_tree, "Device"), &device)) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Device variable required for %s", device_info);
- goto error;
- }
-
- host = xstrdup(device);
- space = strchr(host, ' ');
- if(!space) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Port number required for %s", device_info);
- goto error;
- }
-
- *space++ = 0;
- port = space;
- space = strchr(port, ' ');
-
- if(space) {
- *space++ = 0;
- ttl = atoi(space);
- }
-
- ai = str2addrinfo(host, port, SOCK_DGRAM);
- if(!ai)
- goto error;
-
- device_fd = socket(ai->ai_family, SOCK_DGRAM, IPPROTO_UDP);
- if(device_fd < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Creating socket failed: %s", sockstrerror(sockerrno));
- goto error;
- }
-
-#ifdef FD_CLOEXEC
- fcntl(device_fd, F_SETFD, FD_CLOEXEC);
-#endif
-
- static const int one = 1;
- setsockopt(device_fd, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof one);
-
- if(bind(device_fd, ai->ai_addr, ai->ai_addrlen)) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s %s: %s", host, port, sockstrerror(sockerrno));
- goto error;
- }
-
- switch(ai->ai_family) {
-#ifdef IP_ADD_MEMBERSHIP
- case AF_INET: {
- struct ip_mreq mreq;
- struct sockaddr_in in;
- memcpy(&in, ai->ai_addr, sizeof in);
- mreq.imr_multiaddr.s_addr = in.sin_addr.s_addr;
- mreq.imr_interface.s_addr = htonl(INADDR_ANY);
- if(setsockopt(device_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (void *)&mreq, sizeof mreq)) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Cannot join multicast group %s %s: %s", host, port, sockstrerror(sockerrno));
- goto error;
- }
-#ifdef IP_MULTICAST_LOOP
- setsockopt(device_fd, IPPROTO_IP, IP_MULTICAST_LOOP, (const void *)&one, sizeof one);
-#endif
-#ifdef IP_MULTICAST_TTL
- setsockopt(device_fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&ttl, sizeof ttl);
-#endif
- } break;
-#endif
-
-#ifdef IPV6_JOIN_GROUP
- case AF_INET6: {
- struct ipv6_mreq mreq;
- struct sockaddr_in6 in6;
- memcpy(&in6, ai->ai_addr, sizeof in6);
- memcpy(&mreq.ipv6mr_multiaddr, &in6.sin6_addr, sizeof mreq.ipv6mr_multiaddr);
- mreq.ipv6mr_interface = in6.sin6_scope_id;
- if(setsockopt(device_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, (void *)&mreq, sizeof mreq)) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Cannot join multicast group %s %s: %s", host, port, sockstrerror(sockerrno));
- goto error;
- }
-#ifdef IPV6_MULTICAST_LOOP
- setsockopt(device_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, (const void *)&one, sizeof one);
-#endif
-#ifdef IPV6_MULTICAST_HOPS
- setsockopt(device_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, (void *)&ttl, sizeof ttl);
-#endif
- } break;
-#endif
-
- default:
- logger(DEBUG_ALWAYS, LOG_ERR, "Multicast for address family %hx unsupported", ai->ai_family);
- goto error;
- }
-
- logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
-
- return true;
-
-error:
- if(device_fd >= 0)
- closesocket(device_fd);
- if(ai)
- freeaddrinfo(ai);
- free(host);
-
- return false;
-}
-
-static void close_device(void) {
- close(device_fd);
-
- free(device);
- free(iface);
-
- if(ai)
- freeaddrinfo(ai);
-}
-
-static bool read_packet(vpn_packet_t *packet) {
- int lenin;
-
- if((lenin = recv(device_fd, (void *)packet->data, MTU, 0)) <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
- device, strerror(errno));
- return false;
- }
-
- if(!memcmp(&ignore_src, packet->data + 6, sizeof ignore_src)) {
- logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Ignoring loopback packet of %d bytes from %s", lenin, device_info);
- return false;
- }
-
- packet->len = lenin;
-
- logger(DEBUG_TRAFFIC, LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
- device_info);
-
- return true;
-}
-
-static bool write_packet(vpn_packet_t *packet) {
- logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s",
- packet->len, device_info);
-
- if(sendto(device_fd, (void *)packet->data, packet->len, 0, ai->ai_addr, ai->ai_addrlen) < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device,
- strerror(errno));
- return false;
- }
-
- memcpy(&ignore_src, packet->data + 6, sizeof ignore_src);
-
- return true;
-}
-
-const devops_t multicast_devops = {
- .setup = setup_device,
- .close = close_device,
- .read = read_packet,
- .write = write_packet,
-};
projects / meshlink / blobdiff