2 * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file udp_send.c Para_server's udp sender. */
13 #include "server.cmdline.h"
23 #include "portable_io.h"
24 #include "udp_header.h"
28 #include "close_on_fork.h"
29 #include "chunk_queue.h"
31 /** Describes one entry in the list of targets for the udp sender. */
33 /** The position of this target in the list of targets. */
34 struct list_head node;
35 /** The hostname (DNS name or IPv4/v6 address string). */
36 char host[MAX_HOSTLEN];
41 /** The list of queued chunks for this fd. */
42 struct chunk_queue *cq;
45 static struct list_head targets;
46 static int sender_status;
48 static void udp_close_target(struct udp_target *ut)
53 del_close_on_fork_list(ut->fd);
59 static void udp_delete_target(struct udp_target *ut, const char *msg)
61 PARA_NOTICE_LOG("deleting %s#%d (%s) from list\n", ut->host,
69 * Perform AF-independent multicast sender setup.
71 * \param fd The connected socket descriptor.
72 * \param ttl UDPv4 multicast TTL or UDPv6 multicast number of hops.
73 * Use -1 to mean default, 0..255 otherwise.
74 * \param iface The outgoing multicast interface, or NULL for the default.
76 * \return Zero if okay, negative on error.
78 static int mcast_sender_setup(struct udp_target *ut, int ttl, char *iface)
80 struct sockaddr_storage ss;
81 socklen_t sslen = sizeof(ss);
84 int id = iface == NULL ? 0 : if_nametoindex(iface);
86 if (getpeername(ut->fd, (struct sockaddr *)&ss, &sslen) < 0)
89 if (iface != NULL && id == 0)
90 PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
92 /* RFC 3493, 5.2: -1 means 'use kernel default' */
93 if (ttl < 0 || ttl > 255)
96 switch (ss.ss_family) {
98 if (!IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr)))
104 memset(&mn, 0, sizeof(mn));
106 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_IF, &mn, sizeof(mn)) < 0)
109 PARA_ERROR_LOG("No support for setting outgoing IPv4 mcast interface.");
113 * Enable receiving multicast messages generated on the local host
114 * At least on Linux, this is enabled by default.
116 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_LOOP, &on, sizeof(on)) < 0)
119 /* Default: use local subnet (do not flood out into the WAN) */
122 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
126 if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr))
129 setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &id, sizeof(id)) < 0)
131 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &on, sizeof(on)) < 0)
133 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
137 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
138 return -E_ADDRESS_LOOKUP;
141 return -ERRNO_TO_PARA_ERROR(errno);
144 /** The maximal size of the per-target chunk queue. */
145 #define UDP_CQ_BYTES 40000
147 static int udp_init_session(struct udp_target *ut)
152 if (ut->fd >= 0) /* nothing to do */
155 ret = makesock(AF_UNSPEC, IPPROTO_UDP, 0, ut->host, ut->port);
160 if (conf.udp_mcast_iface_given)
161 iface = conf.udp_mcast_iface_arg;
163 ret = mcast_sender_setup(ut, conf.udp_ttl_arg, iface);
169 ret = mark_fd_nonblocking(ut->fd);
174 add_close_on_fork_list(ut->fd);
175 ut->cq = cq_new(UDP_CQ_BYTES);
176 PARA_NOTICE_LOG("sending to udp %s#%d\n", ut->host, ut->port);
180 static void udp_send_buf(char *buf, size_t len)
182 struct udp_target *ut, *tmp;
185 list_for_each_entry_safe(ut, tmp, &targets, node) {
186 ret = udp_init_session(ut);
188 udp_delete_target(ut, para_strerror(-ret));
191 ret = send_queued_chunks(ut->fd, ut->cq, 0);
193 udp_delete_target(ut, para_strerror(-ret));
198 if (!ret) { /* still data left in the queue */
199 ret = cq_enqueue(ut->cq, buf, len);
201 udp_delete_target(ut, para_strerror(-ret));
205 ret = write_nonblock(ut->fd, buf, len, 0);
207 udp_delete_target(ut, para_strerror(-ret));
211 ret = cq_enqueue(ut->cq, buf + ret, len - ret);
213 udp_delete_target(ut, para_strerror(-ret));
220 static void udp_shutdown_targets(void)
222 char buf[UDP_AUDIO_HEADER_LEN];
223 struct udp_target *ut, *tmp;
224 struct udp_audio_header uah = {
225 .stream_type = UDP_UNKNOWN_STREAM,
226 .packet_type = UDP_EOF_PACKET,
229 write_udp_audio_header(buf, &uah);
230 list_for_each_entry_safe(ut, tmp, &targets, node) {
233 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
234 udp_close_target(ut);
238 static int need_extra_header(long unsigned current_chunk)
240 static struct timeval last_header;
245 tv_diff(now, &last_header, &diff);
246 if (tv2ms(&diff) < conf.udp_header_interval_arg)
252 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
253 const char *buf, size_t len, const char *header_buf,
258 struct timeval *chunk_tv;
259 struct udp_audio_header uah;
261 // PARA_NOTICE_LOG("len: %zd, header_len: %zd\n", len, header_len);
262 if (sender_status != SENDER_ON)
265 /* we might not yet know the chunk time */
266 chunk_tv = vss_chunk_time();
269 if (list_empty(&targets))
271 uah.stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
272 uah.header_len = need_extra_header(current_chunk)? header_len : 0;
274 uah.packet_type = UDP_BOF_PACKET;
275 else if (uah.header_len)
276 uah.packet_type = UDP_HEADER_PACKET;
278 uah.packet_type = UDP_DATA_PACKET;
279 uah.payload_len = uah.header_len + len;
280 sendbuf_len = UDP_AUDIO_HEADER_LEN + uah.payload_len;
281 sendbuf = para_malloc(sendbuf_len);
282 write_udp_audio_header(sendbuf, &uah);
284 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
286 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + uah.header_len, buf, len);
287 udp_send_buf(sendbuf, sendbuf_len);
291 static int udp_com_on(__a_unused struct sender_command_data *scd)
293 sender_status = SENDER_ON;
297 static int udp_com_off(__a_unused struct sender_command_data *scd)
299 udp_shutdown_targets();
300 sender_status = SENDER_OFF;
304 static int udp_com_delete(struct sender_command_data *scd)
306 struct udp_target *ut, *tmp;
308 list_for_each_entry_safe(ut, tmp, &targets, node) {
309 /* Unspecified port means wildcard port match */
310 if (scd->port > 0 && scd->port != ut->port)
312 if (strcmp(ut->host, scd->host))
314 udp_delete_target(ut, "com_delete");
319 static void udp_add_target(const char *host, int port)
321 struct udp_target *ut = para_calloc(sizeof(struct udp_target));
323 strncpy(ut->host, host, sizeof(ut->host));
324 ut->port = port > 0 ? port : conf.udp_default_port_arg;
325 ut->fd = -1; /* not yet connected */
326 PARA_INFO_LOG("adding to target list (%s#%d)\n",
328 para_list_add(&ut->node, &targets);
331 static int udp_com_add(struct sender_command_data *scd)
333 udp_add_target(scd->host, scd->port);
337 static char *udp_info(void)
339 struct udp_target *ut;
340 char *ret, *tgts = NULL;
342 list_for_each_entry(ut, &targets, node) {
343 bool is_v6 = strchr(ut->host, ':') != NULL;
344 char *tmp = make_message("%s%s%s%s:%d ", tgts ? : "",
345 is_v6 ? "[" : "", ut->host,
346 is_v6 ? "]" : "", ut->port);
355 (sender_status == SENDER_ON)? "on" : "off",
356 conf.udp_default_port_arg,
357 tgts? tgts : "(none)"
363 static void udp_init_target_list(void)
365 char host[MAX_HOSTLEN];
368 INIT_LIST_HEAD(&targets);
369 for (i = 0; i < conf.udp_target_given; i++)
370 if (parse_url(conf.udp_target_arg[i], host,
371 sizeof(host), &port) == NULL)
372 PARA_CRIT_LOG("syntax error for udp target option "
373 "#%d, ignoring\n", i);
375 udp_add_target(host, port);
378 static char *udp_help(void)
382 "usage: {add|delete} host[:port]\n"
383 "examples: add 224.0.1.38:1500 (IPv4 multicast)\n"
384 " add 10.10.1.42 (using default port)\n"
385 " add [FF05::42]:1500 (IPv6 multicast)\n"
386 " add [::1] (IPv6 localhost/default port)\n"
387 " delete myhost.net (host with port wildcard)\n"
388 " delete [badc0de::1] (IPv6 with port wildcard)\n"
393 * The init function of para_server's udp sender.
395 * \param s Pointer to the http sender struct.
397 * It initializes all function pointers of \a s and the list of udp targets.
399 void udp_send_init(struct sender *s)
401 INIT_LIST_HEAD(&targets);
405 s->pre_select = NULL;
406 s->post_select = NULL;
407 s->shutdown_clients = udp_shutdown_targets;
408 s->client_cmds[SENDER_ON] = udp_com_on;
409 s->client_cmds[SENDER_OFF] = udp_com_off;
410 s->client_cmds[SENDER_DENY] = NULL;
411 s->client_cmds[SENDER_ALLOW] = NULL;
412 s->client_cmds[SENDER_ADD] = udp_com_add;
413 s->client_cmds[SENDER_DELETE] = udp_com_delete;
414 sender_status = SENDER_OFF;
415 udp_init_target_list();
416 if (!conf.udp_no_autostart_given)
417 sender_status = SENDER_ON;
418 PARA_DEBUG_LOG("udp sender init complete\n");