79f384ab865c8227e19d710fb49cde43754bf44a
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. */
14 #include "server.cmdline.h"
24 #include "portable_io.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
;
43 /** The opaque structure returned by vss_add_fec_client(). */
44 struct fec_client
*fc
;
45 /** The FEC parameters for this target. */
46 struct fec_client_parms fcp
;
49 static struct list_head targets
;
50 static int sender_status
;
52 static void udp_close_target(struct udp_target
*ut
)
57 del_close_on_fork_list(ut
->fd
);
63 static void udp_delete_target(struct udp_target
*ut
, const char *msg
)
65 PARA_NOTICE_LOG("deleting %s#%d (%s) from list\n", ut
->host
,
68 vss_del_fec_client(ut
->fc
);
74 * Perform AF-independent multicast sender setup.
76 * \param fd The connected socket descriptor.
77 * \param ttl UDPv4 multicast TTL or UDPv6 multicast number of hops.
78 * Use -1 to mean default, 0..255 otherwise.
79 * \param iface The outgoing multicast interface, or NULL for the default.
81 * \return Zero if okay, negative on error.
83 static int mcast_sender_setup(struct udp_target
*ut
, int ttl
, char *iface
)
85 struct sockaddr_storage ss
;
86 socklen_t sslen
= sizeof(ss
);
89 int id
= iface
== NULL
? 0 : if_nametoindex(iface
);
91 if (getpeername(ut
->fd
, (struct sockaddr
*)&ss
, &sslen
) < 0)
94 if (iface
!= NULL
&& id
== 0)
95 PARA_WARNING_LOG("could not resolve interface %s, using default", iface
);
97 /* RFC 3493, 5.2: -1 means 'use kernel default' */
98 if (ttl
< 0 || ttl
> 255)
101 switch (ss
.ss_family
) {
103 if (!IN_MULTICAST(htonl(((struct sockaddr_in
*)&ss
)->sin_addr
.s_addr
)))
109 memset(&mn
, 0, sizeof(mn
));
111 if (setsockopt(ut
->fd
, IPPROTO_IP
, IP_MULTICAST_IF
, &mn
, sizeof(mn
)) < 0)
114 PARA_ERROR_LOG("No support for setting outgoing IPv4 mcast interface.");
118 * Enable receiving multicast messages generated on the local host
119 * At least on Linux, this is enabled by default.
121 if (setsockopt(ut
->fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &on
, sizeof(on
)) < 0)
124 /* Default: use local subnet (do not flood out into the WAN) */
127 if (setsockopt(ut
->fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
, sizeof(ttl
)) < 0)
131 if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6
*)&ss
)->sin6_addr
))
134 setsockopt(ut
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_IF
, &id
, sizeof(id
)) < 0)
136 if (setsockopt(ut
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &on
, sizeof(on
)) < 0)
138 if (setsockopt(ut
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
142 PARA_ERROR_LOG("address family %d not supported", ss
.ss_family
);
143 return -E_ADDRESS_LOOKUP
;
146 return -ERRNO_TO_PARA_ERROR(errno
);
149 /** The maximal size of the per-target chunk queue. */
150 #define UDP_CQ_BYTES 40000
152 static int udp_init_session(struct udp_target
*ut
)
157 if (ut
->fd
>= 0) /* nothing to do */
160 ret
= makesock(AF_UNSPEC
, IPPROTO_UDP
, 0, ut
->host
, ut
->port
);
165 if (conf
.udp_mcast_iface_given
)
166 iface
= conf
.udp_mcast_iface_arg
;
168 ret
= mcast_sender_setup(ut
, conf
.udp_ttl_arg
, iface
);
174 ret
= mark_fd_nonblocking(ut
->fd
);
179 add_close_on_fork_list(ut
->fd
);
180 ut
->cq
= cq_new(UDP_CQ_BYTES
);
181 PARA_NOTICE_LOG("sending to udp %s#%d using fec parms %d:%d:%d\n",
182 ut
->host
, ut
->port
, ut
->fcp
.max_slice_bytes
,
183 ut
->fcp
.data_slices_per_group
, ut
->fcp
.slices_per_group
);
187 static void udp_shutdown_targets(void)
189 struct udp_target
*ut
, *tmp
;
190 const char *buf
= NULL
;
191 size_t len
= 0; /* STFU, gcc */
193 list_for_each_entry_safe(ut
, tmp
, &targets
, node
) {
197 len
= vss_get_fec_eof_packet(&buf
);
198 write(ut
->fd
, buf
, len
);
199 udp_close_target(ut
);
203 static int udp_com_on(__a_unused
struct sender_command_data
*scd
)
205 sender_status
= SENDER_ON
;
209 static int udp_com_off(__a_unused
struct sender_command_data
*scd
)
211 udp_shutdown_targets();
212 sender_status
= SENDER_OFF
;
216 static int udp_com_delete(struct sender_command_data
*scd
)
218 struct udp_target
*ut
, *tmp
;
220 list_for_each_entry_safe(ut
, tmp
, &targets
, node
) {
221 /* Unspecified port means wildcard port match */
222 if (scd
->port
> 0 && scd
->port
!= ut
->port
)
224 if (strcmp(ut
->host
, scd
->host
))
226 udp_delete_target(ut
, "com_delete");
231 static int udp_send_fec(char *buf
, size_t len
, void *private_data
)
233 struct udp_target
*ut
= private_data
;
234 int ret
= udp_init_session(ut
);
238 ret
= send_queued_chunks(ut
->fd
, ut
->cq
, 0);
243 if (!ret
) { /* still data left in the queue */
244 ret
= cq_enqueue(ut
->cq
, buf
, len
);
248 ret
= write_nonblock(ut
->fd
, buf
, len
, 0);
252 ret
= cq_enqueue(ut
->cq
, buf
+ ret
, len
- ret
);
258 udp_delete_target(ut
, para_strerror(-ret
));
262 static void udp_add_target(struct sender_command_data
*scd
)
264 struct udp_target
*ut
= para_calloc(sizeof(struct udp_target
));
266 strncpy(ut
->host
, scd
->host
, sizeof(ut
->host
));
267 ut
->port
= scd
->port
> 0 ? scd
->port
: conf
.udp_default_port_arg
;
268 ut
->fd
= -1; /* not yet connected */
269 PARA_INFO_LOG("adding to target list (%s#%d)\n", ut
->host
, ut
->port
);
270 para_list_add(&ut
->node
, &targets
);
271 ut
->fcp
.slices_per_group
= scd
->slices_per_group
;
272 ut
->fcp
.data_slices_per_group
= scd
->data_slices_per_group
;
273 ut
->fcp
.max_slice_bytes
= scd
->max_slice_bytes
;
274 ut
->fcp
.send
= udp_send_fec
;
275 ut
->fcp
.private_data
= ut
;
276 vss_add_fec_client(&ut
->fcp
, &ut
->fc
);
279 static int udp_com_add(struct sender_command_data
*scd
)
285 static char *udp_info(void)
287 struct udp_target
*ut
;
288 char *ret
, *tgts
= NULL
;
290 list_for_each_entry(ut
, &targets
, node
) {
291 bool is_v6
= strchr(ut
->host
, ':') != NULL
;
292 char *tmp
= make_message("%s%s%s%s:%d/%u:%u:%u ", tgts
? : "",
293 is_v6
? "[" : "", ut
->host
,
294 is_v6
? "]" : "", ut
->port
,
295 ut
->fcp
.max_slice_bytes
,
296 ut
->fcp
.data_slices_per_group
,
297 ut
->fcp
.slices_per_group
307 (sender_status
== SENDER_ON
)? "on" : "off",
308 conf
.udp_default_port_arg
,
309 tgts
? tgts
: "(none)"
315 static void udp_init_target_list(void)
317 struct sender_command_data scd
;
320 INIT_LIST_HEAD(&targets
);
321 for (i
= 0; i
< conf
.udp_target_given
; i
++) {
322 if (parse_fec_url(conf
.udp_target_arg
[i
], &scd
) < 0) {
323 PARA_CRIT_LOG("syntax error for udp target option "
324 "#%d, ignoring\n", i
);
327 udp_add_target(&scd
);
331 static char *udp_help(void)
335 "usage: {add|delete} host[:port][/packet_size:k:n]\n"
336 "examples: add 224.0.1.38:1500 (IPv4 multicast)\n"
337 " add 224.0.1.38:1500/1400:14:16\n"
338 " (likewise, using 1400 byte packets, with 14\n"
339 " data slices per 16 slice FEC group)\n"
340 " add 10.10.1.42 (using default port)\n"
341 " add [FF05::42]:1500 (IPv6 multicast)\n"
342 " add [::1] (IPv6 localhost/default port)\n"
343 " delete myhost.net (host with port wildcard)\n"
344 " delete [badc0de::1] (IPv6 with port wildcard)\n"
349 * The init function of para_server's udp sender.
351 * \param s Pointer to the http sender struct.
353 * It initializes all function pointers of \a s and the list of udp targets.
355 void udp_send_init(struct sender
*s
)
357 INIT_LIST_HEAD(&targets
);
361 s
->pre_select
= NULL
;
362 s
->post_select
= NULL
;
363 s
->shutdown_clients
= udp_shutdown_targets
;
364 s
->client_cmds
[SENDER_ON
] = udp_com_on
;
365 s
->client_cmds
[SENDER_OFF
] = udp_com_off
;
366 s
->client_cmds
[SENDER_DENY
] = NULL
;
367 s
->client_cmds
[SENDER_ALLOW
] = NULL
;
368 s
->client_cmds
[SENDER_ADD
] = udp_com_add
;
369 s
->client_cmds
[SENDER_DELETE
] = udp_com_delete
;
370 sender_status
= SENDER_OFF
;
371 udp_init_target_list();
372 if (!conf
.udp_no_autostart_given
)
373 sender_status
= SENDER_ON
;
374 PARA_DEBUG_LOG("udp sender init complete\n");