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 /** Convert in_addr to ascii. */
32 #define TARGET_ADDR(oc) inet_ntoa((oc)->addr)
34 /** Describes one entry in the list of targets for the udp sender. */
38 /** The position of this target in the list of targets. */
39 struct list_head node;
44 /** The list of queued chunks for this fd. */
45 struct chunk_queue *cq;
48 static struct list_head targets;
49 static int sender_status;
51 static void udp_close_target(struct udp_target *ut)
56 del_close_on_fork_list(ut->fd);
62 static void udp_delete_target(struct udp_target *ut, const char *msg)
64 PARA_NOTICE_LOG("deleting %s:%d (%s) from list\n", TARGET_ADDR(ut),
72 * Perform AF-independent multicast sender setup.
74 * \param fd The connected socket descriptor.
75 * \param ttl UDPv4 multicast TTL or UDPv6 multicast number of hops.
76 * Use -1 to mean default, 0..255 otherwise.
78 ** \return Zero if okay, negative on error.
80 static int mcast_sender_setup(struct udp_target *ut, int ttl)
82 struct sockaddr_storage ss;
83 socklen_t sslen = sizeof(ss);
87 if (getpeername(ut->fd, (struct sockaddr *)&ss, &sslen) < 0)
90 /* RFC 3493, 5.2: -1 means 'use kernel default' */
91 if (ttl < 0 || ttl > 255)
94 switch (ss.ss_family) {
96 if (!IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr)))
99 * Enable receiving multicast messages generated on the local host
100 * At least on Linux, this is enabled by default.
102 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_LOOP, &on, sizeof(on)) < 0)
105 /* Default: use local subnet (do not flood out into the WAN) */
108 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
112 if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr))
114 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &on, sizeof(on)) < 0)
116 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
120 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
121 return -E_ADDRESS_LOOKUP;
124 return -ERRNO_TO_PARA_ERROR(errno);
127 /** The maximal size of the per-target chunk queue. */
128 #define UDP_CQ_BYTES 40000
130 static int udp_init_session(struct udp_target *ut)
134 if (ut->fd >= 0) /* nothing to do */
137 ret = makesock(AF_UNSPEC, IPPROTO_UDP, 0, TARGET_ADDR(ut), ut->port);
142 ret = mcast_sender_setup(ut, conf.udp_ttl_arg);
148 ret = mark_fd_nonblocking(ut->fd);
153 add_close_on_fork_list(ut->fd);
154 ut->cq = cq_new(UDP_CQ_BYTES);
155 PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
159 static void udp_send_buf(char *buf, size_t len)
161 struct udp_target *ut, *tmp;
164 list_for_each_entry_safe(ut, tmp, &targets, node) {
165 ret = udp_init_session(ut);
167 udp_delete_target(ut, para_strerror(-ret));
170 ret = send_queued_chunks(ut->fd, ut->cq, 0);
172 udp_delete_target(ut, para_strerror(-ret));
177 if (!ret) { /* still data left in the queue */
178 ret = cq_enqueue(ut->cq, buf, len);
180 udp_delete_target(ut, para_strerror(-ret));
184 ret = write_nonblock(ut->fd, buf, len, 0);
186 udp_delete_target(ut, para_strerror(-ret));
190 ret = cq_enqueue(ut->cq, buf + ret, len - ret);
192 udp_delete_target(ut, para_strerror(-ret));
199 static void udp_shutdown_targets(void)
201 char buf[UDP_AUDIO_HEADER_LEN];
202 struct udp_target *ut, *tmp;
203 struct udp_audio_header uah = {
204 .stream_type = UDP_UNKNOWN_STREAM,
205 .packet_type = UDP_EOF_PACKET,
208 write_udp_audio_header(buf, &uah);
209 list_for_each_entry_safe(ut, tmp, &targets, node) {
212 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
213 udp_close_target(ut);
217 static int need_extra_header(long unsigned current_chunk)
219 static struct timeval last_header;
224 tv_diff(now, &last_header, &diff);
225 if (tv2ms(&diff) < conf.udp_header_interval_arg)
231 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
232 const char *buf, size_t len, const char *header_buf,
237 struct timeval *chunk_tv;
238 struct udp_audio_header uah;
240 // PARA_NOTICE_LOG("len: %zd, header_len: %zd\n", len, header_len);
241 if (sender_status != SENDER_ON)
244 /* we might not yet know the chunk time */
245 chunk_tv = vss_chunk_time();
248 if (list_empty(&targets))
250 uah.stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
251 uah.header_len = need_extra_header(current_chunk)? header_len : 0;
253 uah.packet_type = UDP_BOF_PACKET;
254 else if (uah.header_len)
255 uah.packet_type = UDP_HEADER_PACKET;
257 uah.packet_type = UDP_DATA_PACKET;
258 uah.payload_len = uah.header_len + len;
259 sendbuf_len = UDP_AUDIO_HEADER_LEN + uah.payload_len;
260 sendbuf = para_malloc(sendbuf_len);
261 write_udp_audio_header(sendbuf, &uah);
263 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
265 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + uah.header_len, buf, len);
266 udp_send_buf(sendbuf, sendbuf_len);
270 static int udp_com_on(__a_unused struct sender_command_data *scd)
272 sender_status = SENDER_ON;
276 static int udp_com_off(__a_unused struct sender_command_data *scd)
278 udp_shutdown_targets();
279 sender_status = SENDER_OFF;
283 static int udp_com_delete(struct sender_command_data *scd)
285 char *a = para_strdup(inet_ntoa(scd->addr));
286 struct udp_target *ut, *tmp;
287 list_for_each_entry_safe(ut, tmp, &targets, node) {
288 if (scd->port != ut->port)
290 if (strcmp(TARGET_ADDR(ut), a))
292 udp_delete_target(ut, "com_delete");
297 static void udp_add_target(int port, struct in_addr *addr)
299 struct udp_target *ut = para_calloc(sizeof(struct udp_target));
302 ut->fd = -1; /* not yet connected */
303 PARA_INFO_LOG("adding to target list (%s:%d)\n",
304 TARGET_ADDR(ut), ut->port);
305 para_list_add(&ut->node, &targets);
308 static int udp_com_add(struct sender_command_data *scd)
310 int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
311 udp_add_target(port, &scd->addr);
315 static char *udp_info(void)
317 struct udp_target *ut;
318 char *ret, *tgts = NULL;
320 list_for_each_entry(ut, &targets, node) {
321 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
322 TARGET_ADDR(ut), ut->port);
331 (sender_status == SENDER_ON)? "on" : "off",
332 conf.udp_default_port_arg,
333 tgts? tgts : "(none)"
339 static void udp_init_target_list(void)
343 INIT_LIST_HEAD(&targets);
344 for (i = 0; i < conf.udp_target_given; i++) {
345 char *arg = para_strdup(conf.udp_target_arg[i]);
346 char *p = strchr(arg, ':');
353 if (!inet_pton(AF_INET, arg, &addr))
356 if (port < 0 || port > 65535)
357 port = conf.udp_default_port_arg;
358 udp_add_target(port, &addr);
361 PARA_CRIT_LOG("syntax error for udp target option "
362 "#%d, ignoring\n", i);
369 static char *udp_help(void)
373 "usage: {add|delete} IP port\n"
374 "example: add 224.0.1.38 8000 (multicast streaming)\n"
379 * The init function of para_server's udp sender.
381 * \param s Pointer to the http sender struct.
383 * It initializes all function pointers of \a s and the list of udp targets.
385 void udp_send_init(struct sender *s)
387 INIT_LIST_HEAD(&targets);
391 s->pre_select = NULL;
392 s->post_select = NULL;
393 s->shutdown_clients = udp_shutdown_targets;
394 s->client_cmds[SENDER_ON] = udp_com_on;
395 s->client_cmds[SENDER_OFF] = udp_com_off;
396 s->client_cmds[SENDER_DENY] = NULL;
397 s->client_cmds[SENDER_ALLOW] = NULL;
398 s->client_cmds[SENDER_ADD] = udp_com_add;
399 s->client_cmds[SENDER_DELETE] = udp_com_delete;
400 sender_status = SENDER_OFF;
401 udp_init_target_list();
402 if (!conf.udp_no_autostart_given)
403 sender_status = SENDER_ON;
404 PARA_DEBUG_LOG("udp sender init complete\n");