2 * Copyright (C) 2005-2010 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 <sys/socket.h>
17 #include "server.cmdline.h"
27 #include "portable_io.h"
31 #include "close_on_fork.h"
32 #include "chunk_queue.h"
34 /** Describes one entry in the list of targets for the udp sender. */
36 /** The position of this target in the list of targets. */
37 struct list_head node
;
38 /** The hostname (DNS name or IPv4/v6 address string). */
39 char host
[MAX_HOSTLEN
];
44 /** The list of queued chunks for this fd. */
45 struct chunk_queue
*cq
;
46 /** The opaque structure returned by vss_add_fec_client(). */
47 struct fec_client
*fc
;
48 /** The FEC parameters for this target. */
49 struct fec_client_parms fcp
;
52 static struct list_head targets
;
53 static int sender_status
;
54 static struct sender
*self
;
56 static void udp_close_target(struct udp_target
*ut
)
61 del_close_on_fork_list(ut
->fd
);
67 static void udp_delete_target(struct udp_target
*ut
, const char *msg
)
69 PARA_NOTICE_LOG("deleting %s#%d (%s) from list\n", ut
->host
,
72 vss_del_fec_client(ut
->fc
);
78 * Perform AF-independent multicast sender setup.
80 * \param fd The connected socket descriptor.
81 * \param ttl UDPv4 multicast TTL or UDPv6 multicast number of hops.
82 * Use -1 to mean default, 0..255 otherwise.
83 * \param iface The outgoing multicast interface, or NULL for the default.
85 * \return Zero if okay, negative on error.
87 static int mcast_sender_setup(struct udp_target
*ut
, int ttl
, char *iface
)
89 struct sockaddr_storage ss
;
90 socklen_t sslen
= sizeof(ss
);
93 int id
= iface
== NULL
? 0 : if_nametoindex(iface
);
95 if (getpeername(ut
->fd
, (struct sockaddr
*)&ss
, &sslen
) < 0)
98 if (iface
!= NULL
&& id
== 0)
99 PARA_WARNING_LOG("could not resolve interface %s, using default", iface
);
101 /* RFC 3493, 5.2: -1 means 'use kernel default' */
102 if (ttl
< 0 || ttl
> 255)
105 switch (ss
.ss_family
) {
107 if (!IN_MULTICAST(htonl(((struct sockaddr_in
*)&ss
)->sin_addr
.s_addr
)))
113 memset(&mn
, 0, sizeof(mn
));
115 if (setsockopt(ut
->fd
, IPPROTO_IP
, IP_MULTICAST_IF
, &mn
, sizeof(mn
)) < 0)
118 PARA_ERROR_LOG("No support for setting outgoing IPv4 mcast interface.");
122 * Enable receiving multicast messages generated on the local host
123 * At least on Linux, this is enabled by default.
125 if (setsockopt(ut
->fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &on
, sizeof(on
)) < 0)
128 /* Default: use local subnet (do not flood out into the WAN) */
131 if (setsockopt(ut
->fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
, sizeof(ttl
)) < 0)
135 if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6
*)&ss
)->sin6_addr
))
138 setsockopt(ut
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_IF
, &id
, sizeof(id
)) < 0)
140 if (setsockopt(ut
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &on
, sizeof(on
)) < 0)
142 if (setsockopt(ut
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
146 PARA_ERROR_LOG("address family %d not supported", ss
.ss_family
);
147 return -E_ADDRESS_LOOKUP
;
150 return -ERRNO_TO_PARA_ERROR(errno
);
153 /** The maximal size of the per-target chunk queue. */
154 #define UDP_CQ_BYTES 40000
156 static int udp_open(void *client
, struct fec_client_parms
**fcp
)
158 struct udp_target
*ut
= client
;
162 if (ut
->fd
>= 0) /* nothing to do */
165 ret
= para_connect_simple(IPPROTO_UDP
, ut
->host
, ut
->port
);
170 if (conf
.udp_mcast_iface_given
)
171 iface
= conf
.udp_mcast_iface_arg
;
173 ret
= mcast_sender_setup(ut
, conf
.udp_ttl_arg
, iface
);
179 ret
= mark_fd_nonblocking(ut
->fd
);
184 add_close_on_fork_list(ut
->fd
);
185 ut
->cq
= cq_new(UDP_CQ_BYTES
);
186 ut
->fcp
.max_slice_bytes
= 1472; /* FIXME */
188 PARA_NOTICE_LOG("sending to udp %s#%d\n", ut
->host
, ut
->port
);
192 static void udp_shutdown_targets(void)
194 struct udp_target
*ut
, *tmp
;
195 const char *buf
= NULL
;
196 size_t len
= 0; /* STFU, gcc */
198 list_for_each_entry_safe(ut
, tmp
, &targets
, node
) {
199 int ubuntu_glibc_headers_suck
;
203 len
= vss_get_fec_eof_packet(&buf
);
204 /* ignore return value, we're closing the target anyway. */
205 ubuntu_glibc_headers_suck
= write(ut
->fd
, buf
, len
); /* STFU */
206 udp_close_target(ut
);
210 static int udp_com_on(__a_unused
struct sender_command_data
*scd
)
212 sender_status
= SENDER_ON
;
216 static int udp_com_off(__a_unused
struct sender_command_data
*scd
)
218 udp_shutdown_targets();
219 sender_status
= SENDER_OFF
;
223 static int udp_com_delete(struct sender_command_data
*scd
)
225 struct udp_target
*ut
, *tmp
;
227 list_for_each_entry_safe(ut
, tmp
, &targets
, node
) {
228 /* Unspecified port means wildcard port match */
229 if (scd
->port
> 0 && scd
->port
!= ut
->port
)
231 if (strcmp(ut
->host
, scd
->host
))
233 udp_delete_target(ut
, "com_delete");
238 static int udp_send_fec(char *buf
, size_t len
, void *private_data
)
240 struct udp_target
*ut
= private_data
;
243 if (sender_status
== SENDER_OFF
)
245 ret
= send_queued_chunks(ut
->fd
, ut
->cq
, 0);
246 if (ret
== -ERRNO_TO_PARA_ERROR(ECONNREFUSED
))
252 if (!ret
) { /* still data left in the queue */
253 ret
= cq_force_enqueue(ut
->cq
, buf
, len
);
256 ret
= write_nonblock(ut
->fd
, buf
, len
, 0);
257 if (ret
== -ERRNO_TO_PARA_ERROR(ECONNREFUSED
))
262 ret
= cq_force_enqueue(ut
->cq
, buf
+ ret
, len
- ret
);
267 udp_delete_target(ut
, para_strerror(-ret
));
271 static void udp_add_target(struct sender_command_data
*scd
)
273 struct udp_target
*ut
= para_calloc(sizeof(struct udp_target
));
275 strncpy(ut
->host
, scd
->host
, sizeof(ut
->host
));
276 ut
->port
= scd
->port
> 0 ? scd
->port
: conf
.udp_default_port_arg
;
277 ut
->fd
= -1; /* not yet connected */
278 PARA_INFO_LOG("adding to target list (%s#%d)\n", ut
->host
, ut
->port
);
279 para_list_add(&ut
->node
, &targets
);
280 ut
->fcp
.slices_per_group
= scd
->slices_per_group
;
281 ut
->fcp
.data_slices_per_group
= scd
->data_slices_per_group
;
282 vss_add_fec_client(self
, ut
, &ut
->fc
);
285 static int udp_com_add(struct sender_command_data
*scd
)
291 static char *udp_info(void)
293 struct udp_target
*ut
;
294 char *ret
, *tgts
= NULL
;
296 list_for_each_entry(ut
, &targets
, node
) {
297 bool is_v6
= strchr(ut
->host
, ':') != NULL
;
298 char *tmp
= make_message("%s%s%s%s:%d/%u:%u:%u ", tgts
? : "",
299 is_v6
? "[" : "", ut
->host
,
300 is_v6
? "]" : "", ut
->port
,
301 ut
->fcp
.max_slice_bytes
,
302 ut
->fcp
.data_slices_per_group
,
303 ut
->fcp
.slices_per_group
313 (sender_status
== SENDER_ON
)? "on" : "off",
314 stringify_port(conf
.udp_default_port_arg
, "udp"),
315 tgts
? tgts
: "(none)"
321 static void udp_init_target_list(void)
323 struct sender_command_data scd
;
326 INIT_LIST_HEAD(&targets
);
327 for (i
= 0; i
< conf
.udp_target_given
; i
++) {
328 if (parse_fec_url(conf
.udp_target_arg
[i
], &scd
) < 0) {
329 PARA_CRIT_LOG("syntax error for udp target option "
330 "#%d, ignoring\n", i
);
333 udp_add_target(&scd
);
337 static char *udp_help(void)
341 "usage: {add|delete} host[:port][/packet_size:k:n]\n"
342 "examples: add 224.0.1.38:1500 (IPv4 multicast)\n"
343 " add 224.0.1.38:1500/1400:14:16\n"
344 " (likewise, using 1400 byte packets, with 14\n"
345 " data slices per 16 slice FEC group)\n"
346 " add 10.10.1.42 (using default port)\n"
347 " add [FF05::42]:1500 (IPv6 multicast)\n"
348 " add [::1] (IPv6 localhost/default port)\n"
349 " delete myhost.net (host with port wildcard)\n"
350 " delete [badc0de::1] (IPv6 with port wildcard)\n"
355 * The init function of para_server's udp sender.
357 * \param s Pointer to the udp sender struct.
359 * It initializes all function pointers of \a s and the list of udp targets.
361 void udp_send_init(struct sender
*s
)
363 INIT_LIST_HEAD(&targets
);
367 s
->send_fec
= udp_send_fec
;
369 s
->pre_select
= NULL
;
370 s
->post_select
= NULL
;
371 s
->shutdown_clients
= udp_shutdown_targets
;
372 s
->client_cmds
[SENDER_ON
] = udp_com_on
;
373 s
->client_cmds
[SENDER_OFF
] = udp_com_off
;
374 s
->client_cmds
[SENDER_DENY
] = NULL
;
375 s
->client_cmds
[SENDER_ALLOW
] = NULL
;
376 s
->client_cmds
[SENDER_ADD
] = udp_com_add
;
377 s
->client_cmds
[SENDER_DELETE
] = udp_com_delete
;
378 sender_status
= SENDER_OFF
;
379 udp_init_target_list();
380 if (!conf
.udp_no_autostart_given
)
381 sender_status
= SENDER_ON
;
383 PARA_DEBUG_LOG("udp sender init complete\n");