ca4d8cf291c60f38f64ed488716019c1635a75c7
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");