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 hostname (DNS name or IPv4/v6 address string). */
37 char host
[MAX_HOSTLEN
];
40 /** Common sender client data */
41 struct sender_client
*sc
;
42 /** The opaque structure returned by vss_add_fec_client(). */
43 struct fec_client
*fc
;
44 /** The FEC parameters for this target. */
45 struct fec_client_parms fcp
;
48 static struct list_head targets
;
49 static int sender_status
;
51 static void udp_close_target(struct sender_client
*sc
)
56 del_close_on_fork_list(sc
->fd
);
62 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
,
67 udp_close_target(ut
->sc
);
68 vss_del_fec_client(ut
->fc
);
69 list_del(&ut
->sc
->node
);
75 * Perform AF-independent multicast sender setup.
77 * \param sc The connected sender client.
78 * \param ttl UDPv4 multicast TTL or UDPv6 multicast number of hops.
79 * Use -1 to mean default, 0..255 otherwise.
80 * \param iface The outgoing multicast interface, or NULL for the default.
82 * \return Zero if okay, negative on error.
84 static int mcast_sender_setup(struct sender_client
*sc
, int ttl
, char *iface
)
86 struct sockaddr_storage ss
;
87 socklen_t sslen
= sizeof(ss
);
90 int id
= iface
== NULL
? 0 : if_nametoindex(iface
);
92 if (getpeername(sc
->fd
, (struct sockaddr
*)&ss
, &sslen
) < 0)
95 if (iface
!= NULL
&& id
== 0)
96 PARA_WARNING_LOG("could not resolve interface %s, using default", iface
);
98 /* RFC 3493, 5.2: -1 means 'use kernel default' */
99 if (ttl
< 0 || ttl
> 255)
102 switch (ss
.ss_family
) {
104 if (!IN_MULTICAST(htonl(((struct sockaddr_in
*)&ss
)->sin_addr
.s_addr
)))
110 memset(&mn
, 0, sizeof(mn
));
112 if (setsockopt(sc
->fd
, IPPROTO_IP
, IP_MULTICAST_IF
, &mn
, sizeof(mn
)) < 0)
115 PARA_ERROR_LOG("No support for setting outgoing IPv4 mcast interface.");
119 * Enable receiving multicast messages generated on the local host
120 * At least on Linux, this is enabled by default.
122 if (setsockopt(sc
->fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &on
, sizeof(on
)) < 0)
125 /* Default: use local subnet (do not flood out into the WAN) */
128 if (setsockopt(sc
->fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
, sizeof(ttl
)) < 0)
132 if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6
*)&ss
)->sin6_addr
))
135 setsockopt(sc
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_IF
, &id
, sizeof(id
)) < 0)
137 if (setsockopt(sc
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &on
, sizeof(on
)) < 0)
139 if (setsockopt(sc
->fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
143 PARA_ERROR_LOG("address family %d not supported", ss
.ss_family
);
144 return -E_ADDRESS_LOOKUP
;
147 return -ERRNO_TO_PARA_ERROR(errno
);
150 /** The maximal size of the per-target chunk queue. */
151 #define UDP_CQ_BYTES 40000
153 static int udp_init_session(struct sender_client
*sc
)
155 struct udp_target
*ut
= sc
->private_data
;
159 if (sc
->fd
>= 0) /* nothing to do */
162 ret
= para_connect_simple(IPPROTO_UDP
, ut
->host
, ut
->port
);
167 if (conf
.udp_mcast_iface_given
)
168 iface
= conf
.udp_mcast_iface_arg
;
170 ret
= mcast_sender_setup(sc
, conf
.udp_ttl_arg
, iface
);
176 ret
= mark_fd_nonblocking(sc
->fd
);
181 add_close_on_fork_list(sc
->fd
);
182 sc
->cq
= cq_new(UDP_CQ_BYTES
);
183 PARA_NOTICE_LOG("sending to udp %s#%d\n", ut
->host
, ut
->port
);
187 static void udp_shutdown_targets(void)
189 struct sender_client
*sc
, *tmp
;
190 const char *buf
= NULL
;
191 size_t len
= 0; /* STFU, gcc */
193 list_for_each_entry_safe(sc
, tmp
, &targets
, node
) {
194 int ubuntu_glibc_headers_suck
;
198 len
= vss_get_fec_eof_packet(&buf
);
199 /* ignore return value, we're closing the target anyway. */
200 ubuntu_glibc_headers_suck
= write(sc
->fd
, buf
, len
); /* STFU */
201 udp_close_target(sc
);
205 static int udp_com_on(__a_unused
struct sender_command_data
*scd
)
207 sender_status
= SENDER_ON
;
211 static int udp_com_off(__a_unused
struct sender_command_data
*scd
)
213 udp_shutdown_targets();
214 sender_status
= SENDER_OFF
;
218 static int udp_com_delete(struct sender_command_data
*scd
)
220 struct sender_client
*sc
, *tmp
;
222 list_for_each_entry_safe(sc
, tmp
, &targets
, node
) {
223 struct udp_target
*ut
= sc
->private_data
;
225 /* Unspecified port means wildcard port match */
226 if (scd
->port
> 0 && scd
->port
!= ut
->port
)
228 if (strcmp(ut
->host
, scd
->host
))
230 udp_delete_target(ut
, "com_delete");
235 static int udp_send_fec(struct sender_client
*sc
, char *buf
, size_t len
)
237 struct udp_target
*ut
= sc
->private_data
;
240 if (sender_status
== SENDER_OFF
)
242 ret
= udp_init_session(sc
);
245 ret
= send_queued_chunks(sc
->fd
, sc
->cq
, 0);
246 if (ret
== -ERRNO_TO_PARA_ERROR(ECONNREFUSED
))
252 if (!ret
) { /* still data left in the queue */
253 ret
= cq_force_enqueue(sc
->cq
, buf
, len
);
256 ret
= write_nonblock(sc
->fd
, buf
, len
, 0);
257 if (ret
== -ERRNO_TO_PARA_ERROR(ECONNREFUSED
))
262 ret
= cq_force_enqueue(sc
->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(*ut
));
275 strncpy(ut
->host
, scd
->host
, sizeof(ut
->host
));
276 ut
->port
= scd
->port
> 0 ? scd
->port
: conf
.udp_default_port_arg
;
278 ut
->fcp
.slices_per_group
= scd
->slices_per_group
;
279 ut
->fcp
.data_slices_per_group
= scd
->data_slices_per_group
;
280 ut
->fcp
.max_slice_bytes
= scd
->max_slice_bytes
;
281 ut
->fcp
.init_fec
= NULL
; /* FIXME */
282 ut
->fcp
.send_fec
= udp_send_fec
;
284 ut
->sc
= para_calloc(sizeof(*ut
->sc
));
285 ut
->sc
->fd
= -1; /* not yet connected */
286 ut
->sc
->private_data
= ut
;
287 ut
->fc
= vss_add_fec_client(ut
->sc
, &ut
->fcp
);
289 PARA_INFO_LOG("adding to target list (%s#%d)\n", ut
->host
, ut
->port
);
290 para_list_add(&ut
->sc
->node
, &targets
);
293 static int udp_com_add(struct sender_command_data
*scd
)
299 static char *udp_info(void)
301 struct sender_client
*sc
;
302 char *ret
, *tgts
= NULL
;
304 list_for_each_entry(sc
, &targets
, node
) {
305 struct udp_target
*ut
= sc
->private_data
;
306 bool is_v6
= strchr(ut
->host
, ':') != NULL
;
307 char *tmp
= make_message("%s%s%s%s:%d/%u:%u:%u ", tgts
? : "",
308 is_v6
? "[" : "", ut
->host
,
309 is_v6
? "]" : "", ut
->port
,
310 ut
->fcp
.max_slice_bytes
,
311 ut
->fcp
.data_slices_per_group
,
312 ut
->fcp
.slices_per_group
322 (sender_status
== SENDER_ON
)? "on" : "off",
323 stringify_port(conf
.udp_default_port_arg
, "udp"),
324 tgts
? tgts
: "(none)"
330 static void udp_init_target_list(void)
332 struct sender_command_data scd
;
335 INIT_LIST_HEAD(&targets
);
336 for (i
= 0; i
< conf
.udp_target_given
; i
++) {
337 if (parse_fec_url(conf
.udp_target_arg
[i
], &scd
) < 0) {
338 PARA_CRIT_LOG("syntax error for udp target option "
339 "#%d, ignoring\n", i
);
342 udp_add_target(&scd
);
346 static char *udp_help(void)
350 "usage: {add|delete} host[:port][/packet_size:k:n]\n"
351 "examples: add 224.0.1.38:1500 (IPv4 multicast)\n"
352 " add 224.0.1.38:1500/1400:14:16\n"
353 " (likewise, using 1400 byte packets, with 14\n"
354 " data slices per 16 slice FEC group)\n"
355 " add 10.10.1.42 (using default port)\n"
356 " add [FF05::42]:1500 (IPv6 multicast)\n"
357 " add [::1] (IPv6 localhost/default port)\n"
358 " delete myhost.net (host with port wildcard)\n"
359 " delete [badc0de::1] (IPv6 with port wildcard)\n"
364 * The init function of para_server's udp sender.
366 * \param s Pointer to the udp sender struct.
368 * It initializes all function pointers of \a s and the list of udp targets.
370 void udp_send_init(struct sender
*s
)
372 INIT_LIST_HEAD(&targets
);
376 s
->pre_select
= NULL
;
377 s
->post_select
= NULL
;
378 s
->shutdown_clients
= udp_shutdown_targets
;
379 s
->client_cmds
[SENDER_ON
] = udp_com_on
;
380 s
->client_cmds
[SENDER_OFF
] = udp_com_off
;
381 s
->client_cmds
[SENDER_DENY
] = NULL
;
382 s
->client_cmds
[SENDER_ALLOW
] = NULL
;
383 s
->client_cmds
[SENDER_ADD
] = udp_com_add
;
384 s
->client_cmds
[SENDER_DELETE
] = udp_com_delete
;
385 sender_status
= SENDER_OFF
;
386 udp_init_target_list();
387 if (!conf
.udp_no_autostart_given
)
388 sender_status
= SENDER_ON
;
389 PARA_DEBUG_LOG("udp sender init complete\n");