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. */
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;
55 static void udp_close_target(struct udp_target *ut)
60 del_close_on_fork_list(ut->fd);
66 static void udp_delete_target(struct udp_target *ut, const char *msg)
68 PARA_NOTICE_LOG("deleting %s#%d (%s) from list\n", ut->host,
71 vss_del_fec_client(ut->fc);
77 * Perform AF-independent multicast sender setup.
79 * \param fd The connected socket descriptor.
80 * \param ttl UDPv4 multicast TTL or UDPv6 multicast number of hops.
81 * Use -1 to mean default, 0..255 otherwise.
82 * \param iface The outgoing multicast interface, or NULL for the default.
84 * \return Zero if okay, negative on error.
86 static int mcast_sender_setup(struct udp_target *ut, int ttl, char *iface)
88 struct sockaddr_storage ss;
89 socklen_t sslen = sizeof(ss);
92 int id = iface == NULL ? 0 : if_nametoindex(iface);
94 if (getpeername(ut->fd, (struct sockaddr *)&ss, &sslen) < 0)
97 if (iface != NULL && id == 0)
98 PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
100 /* RFC 3493, 5.2: -1 means 'use kernel default' */
101 if (ttl < 0 || ttl > 255)
104 switch (ss.ss_family) {
106 if (!IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr)))
112 memset(&mn, 0, sizeof(mn));
114 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_IF, &mn, sizeof(mn)) < 0)
117 PARA_ERROR_LOG("No support for setting outgoing IPv4 mcast interface.");
121 * Enable receiving multicast messages generated on the local host
122 * At least on Linux, this is enabled by default.
124 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_LOOP, &on, sizeof(on)) < 0)
127 /* Default: use local subnet (do not flood out into the WAN) */
130 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
134 if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr))
137 setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &id, sizeof(id)) < 0)
139 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &on, sizeof(on)) < 0)
141 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
145 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
146 return -E_ADDRESS_LOOKUP;
149 return -ERRNO_TO_PARA_ERROR(errno);
152 /** The maximal size of the per-target chunk queue. */
153 #define UDP_CQ_BYTES 40000
155 static int udp_init_session(struct udp_target *ut)
160 if (ut->fd >= 0) /* nothing to do */
163 ret = makesock(AF_UNSPEC, IPPROTO_UDP, 0, ut->host, ut->port);
168 if (conf.udp_mcast_iface_given)
169 iface = conf.udp_mcast_iface_arg;
171 ret = mcast_sender_setup(ut, conf.udp_ttl_arg, iface);
177 ret = mark_fd_nonblocking(ut->fd);
182 add_close_on_fork_list(ut->fd);
183 ut->cq = cq_new(UDP_CQ_BYTES);
184 PARA_NOTICE_LOG("sending to udp %s#%d using fec parms %d:%d:%d\n",
185 ut->host, ut->port , ut->fcp.max_slice_bytes,
186 ut->fcp.data_slices_per_group, ut->fcp.slices_per_group);
190 static void udp_shutdown_targets(void)
192 struct udp_target *ut, *tmp;
193 const char *buf = NULL;
194 size_t len = 0; /* STFU, gcc */
196 list_for_each_entry_safe(ut, tmp, &targets, node) {
200 len = vss_get_fec_eof_packet(&buf);
201 write(ut->fd, buf, len);
202 udp_close_target(ut);
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 udp_target *ut, *tmp;
223 list_for_each_entry_safe(ut, tmp, &targets, node) {
224 /* Unspecified port means wildcard port match */
225 if (scd->port > 0 && scd->port != ut->port)
227 if (strcmp(ut->host, scd->host))
229 udp_delete_target(ut, "com_delete");
234 static int udp_send_fec(char *buf, size_t len, void *private_data)
236 struct udp_target *ut = private_data;
237 int ret = udp_init_session(ut);
241 ret = send_queued_chunks(ut->fd, ut->cq, 0);
246 if (!ret) { /* still data left in the queue */
247 ret = cq_enqueue(ut->cq, buf, len);
251 ret = write_nonblock(ut->fd, buf, len, 0);
255 ret = cq_enqueue(ut->cq, buf + ret, len - ret);
261 udp_delete_target(ut, para_strerror(-ret));
265 static void udp_add_target(struct sender_command_data *scd)
267 struct udp_target *ut = para_calloc(sizeof(struct udp_target));
269 strncpy(ut->host, scd->host, sizeof(ut->host));
270 ut->port = scd->port > 0 ? scd->port : conf.udp_default_port_arg;
271 ut->fd = -1; /* not yet connected */
272 PARA_INFO_LOG("adding to target list (%s#%d)\n", ut->host, ut->port);
273 para_list_add(&ut->node, &targets);
274 ut->fcp.slices_per_group = scd->slices_per_group;
275 ut->fcp.data_slices_per_group = scd->data_slices_per_group;
276 ut->fcp.max_slice_bytes = scd->max_slice_bytes;
277 ut->fcp.send = udp_send_fec;
278 ut->fcp.private_data = ut;
279 vss_add_fec_client(&ut->fcp, &ut->fc);
282 static int udp_com_add(struct sender_command_data *scd)
288 static char *udp_info(void)
290 struct udp_target *ut;
291 char *ret, *tgts = NULL;
293 list_for_each_entry(ut, &targets, node) {
294 bool is_v6 = strchr(ut->host, ':') != NULL;
295 char *tmp = make_message("%s%s%s%s:%d/%u:%u:%u ", tgts ? : "",
296 is_v6 ? "[" : "", ut->host,
297 is_v6 ? "]" : "", ut->port,
298 ut->fcp.max_slice_bytes,
299 ut->fcp.data_slices_per_group,
300 ut->fcp.slices_per_group
310 (sender_status == SENDER_ON)? "on" : "off",
311 conf.udp_default_port_arg,
312 tgts? tgts : "(none)"
318 static void udp_init_target_list(void)
320 struct sender_command_data scd;
323 INIT_LIST_HEAD(&targets);
324 for (i = 0; i < conf.udp_target_given; i++) {
325 if (parse_fec_url(conf.udp_target_arg[i], &scd) < 0) {
326 PARA_CRIT_LOG("syntax error for udp target option "
327 "#%d, ignoring\n", i);
330 udp_add_target(&scd);
334 static char *udp_help(void)
338 "usage: {add|delete} host[:port][/packet_size:k:n]\n"
339 "examples: add 224.0.1.38:1500 (IPv4 multicast)\n"
340 " add 224.0.1.38:1500/1400:14:16\n"
341 " (likewise, using 1400 byte packets, with 14\n"
342 " data slices per 16 slice FEC group)\n"
343 " add 10.10.1.42 (using default port)\n"
344 " add [FF05::42]:1500 (IPv6 multicast)\n"
345 " add [::1] (IPv6 localhost/default port)\n"
346 " delete myhost.net (host with port wildcard)\n"
347 " delete [badc0de::1] (IPv6 with port wildcard)\n"
352 * The init function of para_server's udp sender.
354 * \param s Pointer to the udp sender struct.
356 * It initializes all function pointers of \a s and the list of udp targets.
358 void udp_send_init(struct sender *s)
360 INIT_LIST_HEAD(&targets);
364 s->pre_select = NULL;
365 s->post_select = NULL;
366 s->shutdown_clients = udp_shutdown_targets;
367 s->client_cmds[SENDER_ON] = udp_com_on;
368 s->client_cmds[SENDER_OFF] = udp_com_off;
369 s->client_cmds[SENDER_DENY] = NULL;
370 s->client_cmds[SENDER_ALLOW] = NULL;
371 s->client_cmds[SENDER_ADD] = udp_com_add;
372 s->client_cmds[SENDER_DELETE] = udp_com_delete;
373 sender_status = SENDER_OFF;
374 udp_init_target_list();
375 if (!conf.udp_no_autostart_given)
376 sender_status = SENDER_ON;
377 PARA_DEBUG_LOG("udp sender init complete\n");