8eee7e61ac83bd60d56c171bdf01986492e4526b
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");