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>
14 #include <netinet/udp.h>
18 #include "server.cmdline.h"
28 #include "portable_io.h"
32 #include "close_on_fork.h"
33 #include "chunk_queue.h"
35 /** Describes one entry in the list of targets for the udp sender. */
37 /** The hostname (DNS name or IPv4/v6 address string). */
38 char host
[MAX_HOSTLEN
];
41 /** Common sender client data */
42 struct sender_client
*sc
;
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 sender_client
*sc
)
55 del_close_on_fork_list(sc
->fd
);
64 static void udp_delete_target(struct udp_target
*ut
, const char *msg
)
67 PARA_NOTICE_LOG("deleting %s#%d (%s) from list\n", ut
->host
,
69 udp_close_target(ut
->sc
);
70 vss_del_fec_client(ut
->fc
);
71 list_del(&ut
->sc
->node
);
77 * Perform AF-independent multicast sender setup.
79 * \param sc The connected sender client.
81 * \return Zero if okay, negative on error.
83 static int mcast_sender_setup(struct sender_client
*sc
)
85 struct sockaddr_storage ss
;
86 socklen_t sslen
= sizeof(ss
);
87 int ttl
= conf
.udp_ttl_arg
, id
= 0;
90 if (conf
.udp_mcast_iface_given
) {
91 char *iface
= conf
.udp_mcast_iface_arg
;
93 id
= if_nametoindex(iface
);
95 PARA_WARNING_LOG("could not resolve interface '%s', "
96 "using default", iface
);
99 if (getpeername(sc
->fd
, (struct sockaddr
*)&ss
, &sslen
) < 0)
102 /* RFC 3493, 5.2: -1 means 'use kernel default' */
103 if (ttl
< 0 || ttl
> 255)
106 switch (ss
.ss_family
) {
108 if (!IN_MULTICAST(htonl(((struct sockaddr_in
*)&ss
)->sin_addr
.s_addr
)))
114 memset(&mn
, 0, sizeof(mn
));
116 if (setsockopt(sc
->fd
, IPPROTO_IP
, IP_MULTICAST_IF
, &mn
, sizeof(mn
)) < 0)
119 PARA_ERROR_LOG("No support for setting outgoing IPv4 mcast interface.");
123 * Enable receiving multicast messages generated on the local host
124 * At least on Linux, this is enabled by default.
126 if (setsockopt(sc
->fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &on
, sizeof(on
)) < 0)
129 /* Default: use local subnet (do not flood out into the WAN) */
132 if (setsockopt(sc
->fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
, sizeof(ttl
)) < 0)
136 if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6
*)&ss
)->sin6_addr
))
139 setsockopt(sc
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_IF
, &id
, sizeof(id
)) < 0)
141 if (setsockopt(sc
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &on
, sizeof(on
)) < 0)
143 if (setsockopt(sc
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
147 PARA_ERROR_LOG("address family %d not supported", ss
.ss_family
);
148 return -E_ADDRESS_LOOKUP
;
151 return -ERRNO_TO_PARA_ERROR(errno
);
154 /** The maximal size of the per-target chunk queue. */
155 #define UDP_CQ_BYTES 40000
157 static void udp_init_session(struct sender_client
*sc
)
159 if (sc
->cq
== NULL
) {
160 add_close_on_fork_list(sc
->fd
);
161 sc
->cq
= cq_new(UDP_CQ_BYTES
);
162 sc
->name
= para_strdup(remote_name(sc
->fd
));
163 PARA_NOTICE_LOG("sending to udp %s\n", sc
->name
);
167 static void udp_shutdown_targets(void)
169 struct sender_client
*sc
, *tmp
;
171 size_t len
= vss_get_fec_eof_packet(&buf
);
173 list_for_each_entry_safe(sc
, tmp
, &targets
, node
)
174 if (sc
->cq
!= NULL
) {
175 /* ignore return value, closing the target anyway. */
176 (void)write(sc
->fd
, buf
, len
);
177 udp_close_target(sc
);
181 static int udp_com_on(__a_unused
struct sender_command_data
*scd
)
183 sender_status
= SENDER_ON
;
187 static int udp_com_off(__a_unused
struct sender_command_data
*scd
)
189 udp_shutdown_targets();
190 sender_status
= SENDER_OFF
;
194 static int udp_com_delete(struct sender_command_data
*scd
)
196 struct sender_client
*sc
, *tmp
;
198 list_for_each_entry_safe(sc
, tmp
, &targets
, node
) {
199 struct udp_target
*ut
= sc
->private_data
;
201 /* Unspecified port means wildcard port match */
202 if (scd
->port
> 0 && scd
->port
!= ut
->port
)
204 if (strcmp(ut
->host
, scd
->host
))
206 udp_delete_target(ut
, "com_delete");
211 /** Initialize UDP session and set maximum payload size. */
212 static int udp_init_fec(struct sender_client
*sc
)
216 udp_init_session(sc
);
217 mps
= generic_max_transport_msg_size(sc
->fd
) - sizeof(struct udphdr
);
218 PARA_INFO_LOG("current MPS = %d bytes\n", mps
);
222 static int udp_send_fec(struct sender_client
*sc
, char *buf
, size_t len
)
224 struct udp_target
*ut
= sc
->private_data
;
227 if (sender_status
== SENDER_OFF
)
229 ret
= send_queued_chunks(sc
->fd
, sc
->cq
);
230 if (ret
== -ERRNO_TO_PARA_ERROR(ECONNREFUSED
))
236 if (!ret
) { /* still data left in the queue */
237 ret
= cq_force_enqueue(sc
->cq
, buf
, len
);
241 ret
= write_nonblock(sc
->fd
, buf
, len
);
242 if (ret
== -ERRNO_TO_PARA_ERROR(ECONNREFUSED
))
247 ret
= cq_force_enqueue(sc
->cq
, buf
+ ret
, len
- ret
);
252 udp_delete_target(ut
, para_strerror(-ret
));
256 static void udp_add_target(struct sender_command_data
*scd
)
258 int ret
, port
= scd
->port
> 0 ? scd
->port
: conf
.udp_default_port_arg
;
259 struct udp_target
*ut
= para_calloc(sizeof(*ut
));
261 strncpy(ut
->host
, scd
->host
, sizeof(ut
->host
));
262 ut
->port
= scd
->port
> 0 ? scd
->port
: conf
.udp_default_port_arg
;
264 ut
->fcp
.slices_per_group
= scd
->slices_per_group
;
265 ut
->fcp
.data_slices_per_group
= scd
->data_slices_per_group
;
266 ut
->fcp
.max_slice_bytes
= scd
->max_slice_bytes
;
267 ut
->fcp
.init_fec
= udp_init_fec
;
268 ut
->fcp
.send_fec
= udp_send_fec
;
270 ut
->sc
= para_calloc(sizeof(*ut
->sc
));
271 ut
->sc
->private_data
= ut
;
273 ret
= para_connect_simple(IPPROTO_UDP
, scd
->host
, port
);
278 ret
= mcast_sender_setup(ut
->sc
);
281 ret
= mark_fd_nonblocking(ut
->sc
->fd
);
284 PARA_INFO_LOG("adding to target list (%s#%d)\n", ut
->host
, ut
->port
);
285 ut
->fc
= vss_add_fec_client(ut
->sc
, &ut
->fcp
);
286 para_list_add(&ut
->sc
->node
, &targets
);
291 PARA_NOTICE_LOG("failed to set up %s#%d (%s)- not adding it\n",
292 scd
->host
, port
, para_strerror(-ret
));
297 static int udp_com_add(struct sender_command_data
*scd
)
303 static char *udp_info(void)
305 struct sender_client
*sc
;
306 char *ret
, *tgts
= NULL
;
308 list_for_each_entry(sc
, &targets
, node
) {
309 struct udp_target
*ut
= sc
->private_data
;
310 bool is_v6
= strchr(ut
->host
, ':') != NULL
;
311 char *tmp
= make_message("%s%s%s%s:%d/%u:%u:%u ", tgts
? : "",
312 is_v6
? "[" : "", ut
->host
,
313 is_v6
? "]" : "", ut
->port
,
314 ut
->fcp
.max_slice_bytes
,
315 ut
->fcp
.data_slices_per_group
,
316 ut
->fcp
.slices_per_group
326 (sender_status
== SENDER_ON
)? "on" : "off",
327 stringify_port(conf
.udp_default_port_arg
, "udp"),
328 tgts
? tgts
: "(none)"
334 static void udp_init_target_list(void)
336 struct sender_command_data scd
;
339 INIT_LIST_HEAD(&targets
);
340 for (i
= 0; i
< conf
.udp_target_given
; i
++) {
341 if (parse_fec_url(conf
.udp_target_arg
[i
], &scd
) < 0) {
342 PARA_CRIT_LOG("syntax error for udp target option "
343 "#%d, ignoring\n", i
);
346 udp_add_target(&scd
);
350 static char *udp_help(void)
354 "usage: {add|delete} host[:port][/packet_size:k:n]\n"
355 "examples: add 224.0.1.38:1500 (IPv4 multicast)\n"
356 " add 224.0.1.38:1500/1400:14:16\n"
357 " (likewise, using 1400 byte packets, with 14\n"
358 " data slices per 16 slice FEC group)\n"
359 " add 10.10.1.42 (using default port)\n"
360 " add [FF05::42]:1500 (IPv6 multicast)\n"
361 " add [::1] (IPv6 localhost/default port)\n"
362 " delete myhost.net (host with port wildcard)\n"
363 " delete [badc0de::1] (IPv6 with port wildcard)\n"
368 * The init function of para_server's udp sender.
370 * \param s Pointer to the udp sender struct.
372 * It initializes all function pointers of \a s and the list of udp targets.
374 void udp_send_init(struct sender
*s
)
376 INIT_LIST_HEAD(&targets
);
380 s
->pre_select
= NULL
;
381 s
->post_select
= NULL
;
382 s
->shutdown_clients
= udp_shutdown_targets
;
383 s
->client_cmds
[SENDER_ON
] = udp_com_on
;
384 s
->client_cmds
[SENDER_OFF
] = udp_com_off
;
385 s
->client_cmds
[SENDER_DENY
] = NULL
;
386 s
->client_cmds
[SENDER_ALLOW
] = NULL
;
387 s
->client_cmds
[SENDER_ADD
] = udp_com_add
;
388 s
->client_cmds
[SENDER_DELETE
] = udp_com_delete
;
389 sender_status
= SENDER_OFF
;
390 udp_init_target_list();
391 if (!conf
.udp_no_autostart_given
)
392 sender_status
= SENDER_ON
;
393 PARA_DEBUG_LOG("udp sender init complete\n");