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
)
57 del_close_on_fork_list(sc
->fd
);
63 static void udp_delete_target(struct udp_target
*ut
, const char *msg
)
66 PARA_NOTICE_LOG("deleting %s#%d (%s) from list\n", ut
->host
,
68 udp_close_target(ut
->sc
);
69 vss_del_fec_client(ut
->fc
);
70 list_del(&ut
->sc
->node
);
76 * Perform AF-independent multicast sender setup.
78 * \param sc The connected sender client.
79 * \param ttl UDPv4 multicast TTL or UDPv6 multicast number of hops.
80 * Use -1 to mean default, 0..255 otherwise.
81 * \param iface The outgoing multicast interface, or NULL for the default.
83 * \return Zero if okay, negative on error.
85 static int mcast_sender_setup(struct sender_client
*sc
, int ttl
, char *iface
)
87 struct sockaddr_storage ss
;
88 socklen_t sslen
= sizeof(ss
);
91 int id
= iface
== NULL
? 0 : if_nametoindex(iface
);
93 if (getpeername(sc
->fd
, (struct sockaddr
*)&ss
, &sslen
) < 0)
96 if (iface
!= NULL
&& id
== 0)
97 PARA_WARNING_LOG("could not resolve interface %s, using default", iface
);
99 /* RFC 3493, 5.2: -1 means 'use kernel default' */
100 if (ttl
< 0 || ttl
> 255)
103 switch (ss
.ss_family
) {
105 if (!IN_MULTICAST(htonl(((struct sockaddr_in
*)&ss
)->sin_addr
.s_addr
)))
111 memset(&mn
, 0, sizeof(mn
));
113 if (setsockopt(sc
->fd
, IPPROTO_IP
, IP_MULTICAST_IF
, &mn
, sizeof(mn
)) < 0)
116 PARA_ERROR_LOG("No support for setting outgoing IPv4 mcast interface.");
120 * Enable receiving multicast messages generated on the local host
121 * At least on Linux, this is enabled by default.
123 if (setsockopt(sc
->fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &on
, sizeof(on
)) < 0)
126 /* Default: use local subnet (do not flood out into the WAN) */
129 if (setsockopt(sc
->fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
, sizeof(ttl
)) < 0)
133 if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6
*)&ss
)->sin6_addr
))
136 setsockopt(sc
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_IF
, &id
, sizeof(id
)) < 0)
138 if (setsockopt(sc
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &on
, sizeof(on
)) < 0)
140 if (setsockopt(sc
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
144 PARA_ERROR_LOG("address family %d not supported", ss
.ss_family
);
145 return -E_ADDRESS_LOOKUP
;
148 return -ERRNO_TO_PARA_ERROR(errno
);
151 /** The maximal size of the per-target chunk queue. */
152 #define UDP_CQ_BYTES 40000
154 static int udp_init_session(struct sender_client
*sc
)
156 struct udp_target
*ut
= sc
->private_data
;
160 if (sc
->fd
>= 0) /* nothing to do */
163 ret
= para_connect_simple(IPPROTO_UDP
, ut
->host
, ut
->port
);
168 if (conf
.udp_mcast_iface_given
)
169 iface
= conf
.udp_mcast_iface_arg
;
171 ret
= mcast_sender_setup(sc
, conf
.udp_ttl_arg
, iface
);
177 ret
= mark_fd_nonblocking(sc
->fd
);
182 add_close_on_fork_list(sc
->fd
);
183 sc
->cq
= cq_new(UDP_CQ_BYTES
);
184 PARA_NOTICE_LOG("sending to udp %s#%d\n", ut
->host
, ut
->port
);
188 static void udp_shutdown_targets(void)
190 struct sender_client
*sc
, *tmp
;
191 const char *buf
= NULL
;
192 size_t len
= 0; /* STFU, gcc */
194 list_for_each_entry_safe(sc
, tmp
, &targets
, node
) {
195 int ubuntu_glibc_headers_suck
;
199 len
= vss_get_fec_eof_packet(&buf
);
200 /* ignore return value, we're closing the target anyway. */
201 ubuntu_glibc_headers_suck
= write(sc
->fd
, buf
, len
); /* STFU */
202 udp_close_target(sc
);
206 static int udp_com_on(__a_unused
struct sender_command_data
*scd
)
208 sender_status
= SENDER_ON
;
212 static int udp_com_off(__a_unused
struct sender_command_data
*scd
)
214 udp_shutdown_targets();
215 sender_status
= SENDER_OFF
;
219 static int udp_com_delete(struct sender_command_data
*scd
)
221 struct sender_client
*sc
, *tmp
;
223 list_for_each_entry_safe(sc
, tmp
, &targets
, node
) {
224 struct udp_target
*ut
= sc
->private_data
;
226 /* Unspecified port means wildcard port match */
227 if (scd
->port
> 0 && scd
->port
!= ut
->port
)
229 if (strcmp(ut
->host
, scd
->host
))
231 udp_delete_target(ut
, "com_delete");
236 /** Initialize UDP session and set maximum payload size. */
237 static int udp_init_fec(struct sender_client
*sc
)
239 int mps
, ret
= udp_init_session(sc
);
244 mps
= generic_max_transport_msg_size(sc
->fd
) - sizeof(struct udphdr
);
245 PARA_INFO_LOG("current MPS = %d bytes\n", mps
);
249 static int udp_send_fec(struct sender_client
*sc
, char *buf
, size_t len
)
251 struct udp_target
*ut
= sc
->private_data
;
254 if (sender_status
== SENDER_OFF
)
256 ret
= send_queued_chunks(sc
->fd
, sc
->cq
);
257 if (ret
== -ERRNO_TO_PARA_ERROR(ECONNREFUSED
))
263 if (!ret
) { /* still data left in the queue */
264 ret
= cq_force_enqueue(sc
->cq
, buf
, len
);
268 ret
= write_nonblock(sc
->fd
, buf
, len
);
269 if (ret
== -ERRNO_TO_PARA_ERROR(ECONNREFUSED
))
274 ret
= cq_force_enqueue(sc
->cq
, buf
+ ret
, len
- ret
);
279 udp_delete_target(ut
, para_strerror(-ret
));
283 static void udp_add_target(struct sender_command_data
*scd
)
285 struct udp_target
*ut
= para_calloc(sizeof(*ut
));
287 strncpy(ut
->host
, scd
->host
, sizeof(ut
->host
));
288 ut
->port
= scd
->port
> 0 ? scd
->port
: conf
.udp_default_port_arg
;
290 ut
->fcp
.slices_per_group
= scd
->slices_per_group
;
291 ut
->fcp
.data_slices_per_group
= scd
->data_slices_per_group
;
292 ut
->fcp
.max_slice_bytes
= scd
->max_slice_bytes
;
293 ut
->fcp
.init_fec
= udp_init_fec
;
294 ut
->fcp
.send_fec
= udp_send_fec
;
296 ut
->sc
= para_calloc(sizeof(*ut
->sc
));
297 ut
->sc
->fd
= -1; /* not yet connected */
298 ut
->sc
->private_data
= ut
;
299 ut
->fc
= vss_add_fec_client(ut
->sc
, &ut
->fcp
);
301 PARA_INFO_LOG("adding to target list (%s#%d)\n", ut
->host
, ut
->port
);
302 para_list_add(&ut
->sc
->node
, &targets
);
305 static int udp_com_add(struct sender_command_data
*scd
)
311 static char *udp_info(void)
313 struct sender_client
*sc
;
314 char *ret
, *tgts
= NULL
;
316 list_for_each_entry(sc
, &targets
, node
) {
317 struct udp_target
*ut
= sc
->private_data
;
318 bool is_v6
= strchr(ut
->host
, ':') != NULL
;
319 char *tmp
= make_message("%s%s%s%s:%d/%u:%u:%u ", tgts
? : "",
320 is_v6
? "[" : "", ut
->host
,
321 is_v6
? "]" : "", ut
->port
,
322 ut
->fcp
.max_slice_bytes
,
323 ut
->fcp
.data_slices_per_group
,
324 ut
->fcp
.slices_per_group
334 (sender_status
== SENDER_ON
)? "on" : "off",
335 stringify_port(conf
.udp_default_port_arg
, "udp"),
336 tgts
? tgts
: "(none)"
342 static void udp_init_target_list(void)
344 struct sender_command_data scd
;
347 INIT_LIST_HEAD(&targets
);
348 for (i
= 0; i
< conf
.udp_target_given
; i
++) {
349 if (parse_fec_url(conf
.udp_target_arg
[i
], &scd
) < 0) {
350 PARA_CRIT_LOG("syntax error for udp target option "
351 "#%d, ignoring\n", i
);
354 udp_add_target(&scd
);
358 static char *udp_help(void)
362 "usage: {add|delete} host[:port][/packet_size:k:n]\n"
363 "examples: add 224.0.1.38:1500 (IPv4 multicast)\n"
364 " add 224.0.1.38:1500/1400:14:16\n"
365 " (likewise, using 1400 byte packets, with 14\n"
366 " data slices per 16 slice FEC group)\n"
367 " add 10.10.1.42 (using default port)\n"
368 " add [FF05::42]:1500 (IPv6 multicast)\n"
369 " add [::1] (IPv6 localhost/default port)\n"
370 " delete myhost.net (host with port wildcard)\n"
371 " delete [badc0de::1] (IPv6 with port wildcard)\n"
376 * The init function of para_server's udp sender.
378 * \param s Pointer to the udp sender struct.
380 * It initializes all function pointers of \a s and the list of udp targets.
382 void udp_send_init(struct sender
*s
)
384 INIT_LIST_HEAD(&targets
);
388 s
->pre_select
= NULL
;
389 s
->post_select
= NULL
;
390 s
->shutdown_clients
= udp_shutdown_targets
;
391 s
->client_cmds
[SENDER_ON
] = udp_com_on
;
392 s
->client_cmds
[SENDER_OFF
] = udp_com_off
;
393 s
->client_cmds
[SENDER_DENY
] = NULL
;
394 s
->client_cmds
[SENDER_ALLOW
] = NULL
;
395 s
->client_cmds
[SENDER_ADD
] = udp_com_add
;
396 s
->client_cmds
[SENDER_DELETE
] = udp_com_delete
;
397 sender_status
= SENDER_OFF
;
398 udp_init_target_list();
399 if (!conf
.udp_no_autostart_given
)
400 sender_status
= SENDER_ON
;
401 PARA_DEBUG_LOG("udp sender init complete\n");