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1 /*
2  * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
3  *
4  * Licensed under the GPL v2. For licencing details see COPYING.
5  */
6
7 /** \file udp_send.c Para_server's udp sender. */
8
9
10 #include <sys/time.h>
11 #include <dirent.h>
12
13 #include "server.cmdline.h"
14 #include "para.h"
15 #include "error.h"
16 #include "string.h"
17 #include "afh.h"
18 #include "afs.h"
19 #include "server.h"
20 #include "vss.h"
21 #include "list.h"
22 #include "send.h"
23 #include "portable_io.h"
24 #include "udp_header.h"
25 #include "net.h"
26 #include "fd.h"
27 #include "sched.h"
28 #include "close_on_fork.h"
29 #include "chunk_queue.h"
30
31 /** Describes one entry in the list of targets for the udp sender. */
32 struct udp_target {
33         /** The position of this target in the list of targets. */
34         struct list_head node;
35         /** The hostname (DNS name or IPv4/v6 address string). */
36         char host[MAX_HOSTLEN];
37         /** The UDP port. */
38         int port;
39         /** The socket fd. */
40         int fd;
41         /** The list of queued chunks for this fd. */
42         struct chunk_queue *cq;
43 };
44
45 static struct list_head targets;
46 static int sender_status;
47
48 static void udp_close_target(struct udp_target *ut)
49 {
50         if (ut->fd < 0)
51                 return;
52         close(ut->fd);
53         del_close_on_fork_list(ut->fd);
54         cq_destroy(ut->cq);
55         ut->cq = NULL;
56         ut->fd = -1;
57 }
58
59 static void udp_delete_target(struct udp_target *ut, const char *msg)
60 {
61         PARA_NOTICE_LOG("deleting %s#%d (%s) from list\n", ut->host,
62                 ut->port, msg);
63         udp_close_target(ut);
64         list_del(&ut->node);
65         free(ut);
66 }
67
68 /**
69  * Perform AF-independent multicast sender setup.
70  *
71  * \param fd    The connected socket descriptor.
72  * \param ttl   UDPv4 multicast TTL or UDPv6 multicast number of hops.
73  *              Use -1 to mean default, 0..255 otherwise.
74  * \param iface The outgoing multicast interface, or NULL for the default.
75  *
76  * \return Zero if okay, negative on error.
77  */
78 static int mcast_sender_setup(struct udp_target *ut, int ttl, char *iface)
79 {
80         struct sockaddr_storage ss;
81         socklen_t sslen = sizeof(ss);
82
83         const int on = 1;
84         int id = iface == NULL ? 0 : if_nametoindex(iface);
85
86         if (getpeername(ut->fd, (struct sockaddr *)&ss, &sslen) < 0)
87                 goto err;
88
89         if (iface != NULL && id == 0)
90                 PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
91
92         /* RFC 3493, 5.2: -1 means 'use kernel default' */
93         if (ttl < 0 || ttl > 255)
94                 ttl = -1;
95
96         switch (ss.ss_family) {
97         case AF_INET:
98                 if (!IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr)))
99                         return 0;
100                 if (id != 0) {
101 #ifdef HAVE_IP_MREQN
102                         struct ip_mreqn mn;
103
104                         memset(&mn, 0, sizeof(mn));
105                         mn.imr_ifindex = id;
106                         if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_IF, &mn, sizeof(mn)) < 0)
107                                 goto err;
108 #else
109                         PARA_ERROR_LOG("No support for setting outgoing IPv4 mcast interface.");
110 #endif
111                 }
112                 /*
113                  * Enable receiving multicast messages generated on the local host
114                  * At least on Linux, this is enabled by default.
115                  */
116                 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_LOOP, &on, sizeof(on)) < 0)
117                         break;
118
119                 /* Default: use local subnet (do not flood out into the WAN) */
120                 if (ttl == -1)
121                         ttl = 1;
122                 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
123                         break;
124                 return 0;
125         case AF_INET6:
126                 if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr))
127                         return 0;
128                 if (id != 0 &&
129                     setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &id, sizeof(id)) < 0)
130                         break;
131                 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &on, sizeof(on)) < 0)
132                         break;
133                 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
134                         break;
135                 return 0;
136         default:
137                 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
138                 return -E_ADDRESS_LOOKUP;
139         }
140 err:
141         return -ERRNO_TO_PARA_ERROR(errno);
142 }
143
144 /** The maximal size of the per-target chunk queue. */
145 #define UDP_CQ_BYTES 40000
146
147 static int udp_init_session(struct udp_target *ut)
148 {
149         int ret;
150         char *iface = NULL;
151
152         if (ut->fd >= 0) /* nothing to do */
153                 return 0;
154
155         ret = makesock(AF_UNSPEC, IPPROTO_UDP, 0, ut->host, ut->port);
156         if (ret < 0)
157                 return ret;
158         ut->fd = ret;
159
160         if (conf.udp_mcast_iface_given)
161                 iface = conf.udp_mcast_iface_arg;
162
163         ret = mcast_sender_setup(ut, conf.udp_ttl_arg, iface);
164         if (ret < 0) {
165                 close(ut->fd);
166                 return ret;
167         }
168
169         ret = mark_fd_nonblocking(ut->fd);
170         if (ret < 0) {
171                 close(ut->fd);
172                 return ret;
173         }
174         add_close_on_fork_list(ut->fd);
175         ut->cq = cq_new(UDP_CQ_BYTES);
176         PARA_NOTICE_LOG("sending to udp %s#%d\n", ut->host, ut->port);
177         return 1;
178 }
179
180 static void udp_send_buf(char *buf, size_t len)
181 {
182         struct udp_target *ut, *tmp;
183         int ret;
184
185         list_for_each_entry_safe(ut, tmp, &targets, node) {
186                 ret = udp_init_session(ut);
187                 if (ret < 0) {
188                         udp_delete_target(ut, para_strerror(-ret));
189                         continue;
190                 }
191                 ret = send_queued_chunks(ut->fd, ut->cq, 0);
192                 if (ret < 0) {
193                         udp_delete_target(ut, para_strerror(-ret));
194                         continue;
195                 }
196                 if (!len)
197                         continue;
198                 if (!ret) { /* still data left in the queue */
199                         ret = cq_enqueue(ut->cq, buf, len);
200                         if (ret < 0) {
201                                 udp_delete_target(ut, para_strerror(-ret));
202                                 continue;
203                         }
204                 }
205                 ret = write_nonblock(ut->fd, buf, len, 0);
206                 if (ret < 0) {
207                         udp_delete_target(ut, para_strerror(-ret));
208                         continue;
209                 }
210                 if (ret != len) {
211                         ret = cq_enqueue(ut->cq, buf + ret, len - ret);
212                         if (ret < 0) {
213                                 udp_delete_target(ut, para_strerror(-ret));
214                                 continue;
215                         }
216                 }
217         }
218 }
219
220 static void udp_shutdown_targets(void)
221 {
222         char buf[UDP_AUDIO_HEADER_LEN];
223         struct udp_target *ut, *tmp;
224         struct udp_audio_header uah = {
225                 .stream_type = UDP_UNKNOWN_STREAM,
226                 .packet_type = UDP_EOF_PACKET,
227         };
228
229         write_udp_audio_header(buf, &uah);
230         list_for_each_entry_safe(ut, tmp, &targets, node) {
231                 if (ut->fd < 0)
232                         continue;
233                 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
234                 udp_close_target(ut);
235         }
236 }
237
238 static int need_extra_header(long unsigned current_chunk)
239 {
240         static struct timeval last_header;
241         struct timeval diff;
242
243         if (!current_chunk)
244                 return 0;
245         tv_diff(now, &last_header, &diff);
246         if (tv2ms(&diff) < conf.udp_header_interval_arg)
247                 return 0;
248         last_header = *now;
249         return 1;
250 }
251
252 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
253                 const char *buf, size_t len, const char *header_buf,
254                 size_t header_len)
255 {
256         char *sendbuf;
257         size_t sendbuf_len;
258         struct timeval *chunk_tv;
259         struct udp_audio_header uah;
260
261 //      PARA_NOTICE_LOG("len: %zd, header_len: %zd\n", len, header_len);
262         if (sender_status != SENDER_ON)
263                 return;
264
265         /* we might not yet know the chunk time */
266         chunk_tv = vss_chunk_time();
267         if (!chunk_tv)
268                 return;
269         if (list_empty(&targets))
270                 return;
271         uah.stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
272         uah.header_len = need_extra_header(current_chunk)? header_len : 0;
273         if (!current_chunk)
274                 uah.packet_type = UDP_BOF_PACKET;
275         else if (uah.header_len)
276                 uah.packet_type = UDP_HEADER_PACKET;
277         else
278                 uah.packet_type = UDP_DATA_PACKET;
279         uah.payload_len = uah.header_len + len;
280         sendbuf_len = UDP_AUDIO_HEADER_LEN + uah.payload_len;
281         sendbuf = para_malloc(sendbuf_len);
282         write_udp_audio_header(sendbuf, &uah);
283         if (uah.header_len)
284                 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
285                         uah.header_len);
286         memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + uah.header_len, buf, len);
287         udp_send_buf(sendbuf, sendbuf_len);
288         free(sendbuf);
289 }
290
291 static int udp_com_on(__a_unused struct sender_command_data *scd)
292 {
293         sender_status = SENDER_ON;
294         return 1;
295 }
296
297 static int udp_com_off(__a_unused struct sender_command_data *scd)
298 {
299         udp_shutdown_targets();
300         sender_status = SENDER_OFF;
301         return 1;
302 }
303
304 static int udp_com_delete(struct sender_command_data *scd)
305 {
306         struct udp_target *ut, *tmp;
307
308         list_for_each_entry_safe(ut, tmp, &targets, node) {
309                 /* Unspecified port means wildcard port match */
310                 if (scd->port > 0 && scd->port != ut->port)
311                         continue;
312                 if (strcmp(ut->host, scd->host))
313                         continue;
314                 udp_delete_target(ut, "com_delete");
315         }
316         return 1;
317 }
318
319 static void udp_add_target(const char *host, int port)
320 {
321         struct udp_target *ut = para_calloc(sizeof(struct udp_target));
322
323         strncpy(ut->host, host, sizeof(ut->host));
324         ut->port = port > 0 ? port : conf.udp_default_port_arg;
325         ut->fd = -1; /* not yet connected */
326         PARA_INFO_LOG("adding to target list (%s#%d)\n",
327                       ut->host, ut->port);
328         para_list_add(&ut->node, &targets);
329 }
330
331 static int udp_com_add(struct sender_command_data *scd)
332 {
333         udp_add_target(scd->host, scd->port);
334         return 1;
335 }
336
337 static char *udp_info(void)
338 {
339         struct udp_target *ut;
340         char *ret, *tgts = NULL;
341
342         list_for_each_entry(ut, &targets, node) {
343                 bool is_v6 = strchr(ut->host, ':') != NULL;
344                 char *tmp = make_message("%s%s%s%s:%d ", tgts ? : "",
345                                          is_v6 ? "[" : "", ut->host,
346                                          is_v6 ? "]" : "", ut->port);
347                 free(tgts);
348                 tgts = tmp;
349         }
350         ret = make_message(
351                 "udp sender:\n"
352                 "\tstatus: %s\n"
353                 "\tport: udp %d\n"
354                 "\ttargets: %s\n",
355                 (sender_status == SENDER_ON)? "on" : "off",
356                 conf.udp_default_port_arg,
357                 tgts? tgts : "(none)"
358         );
359         free(tgts);
360         return ret;
361 }
362
363 static void udp_init_target_list(void)
364 {
365         char    host[MAX_HOSTLEN];
366         int     port, i;
367
368         INIT_LIST_HEAD(&targets);
369         for (i = 0; i < conf.udp_target_given; i++)
370                 if (parse_url(conf.udp_target_arg[i], host,
371                                         sizeof(host), &port) == NULL)
372                         PARA_CRIT_LOG("syntax error for udp target option "
373                                       "#%d, ignoring\n", i);
374                 else
375                         udp_add_target(host, port);
376 }
377
378 static char *udp_help(void)
379 {
380         return make_message(
381                 "usage: {on|off}\n"
382                 "usage: {add|delete} host[:port]\n"
383                 "examples: add 224.0.1.38:1500  (IPv4 multicast)\n"
384                 "          add 10.10.1.42       (using default port)\n"
385                 "          add [FF05::42]:1500  (IPv6 multicast)\n"
386                 "          add [::1]            (IPv6 localhost/default port)\n"
387                 "          delete myhost.net    (host with port wildcard)\n"
388                 "          delete [badc0de::1]  (IPv6 with port wildcard)\n"
389         );
390 }
391
392 /**
393  * The init function of para_server's udp sender.
394  *
395  * \param s Pointer to the http sender struct.
396  *
397  * It initializes all function pointers of \a s and the list of udp targets.
398  */
399 void udp_send_init(struct sender *s)
400 {
401         INIT_LIST_HEAD(&targets);
402         s->info = udp_info;
403         s->help = udp_help;
404         s->send = udp_send;
405         s->pre_select = NULL;
406         s->post_select = NULL;
407         s->shutdown_clients = udp_shutdown_targets;
408         s->client_cmds[SENDER_ON] = udp_com_on;
409         s->client_cmds[SENDER_OFF] = udp_com_off;
410         s->client_cmds[SENDER_DENY] = NULL;
411         s->client_cmds[SENDER_ALLOW] = NULL;
412         s->client_cmds[SENDER_ADD] = udp_com_add;
413         s->client_cmds[SENDER_DELETE] = udp_com_delete;
414         sender_status = SENDER_OFF;
415         udp_init_target_list();
416         if (!conf.udp_no_autostart_given)
417                 sender_status = SENDER_ON;
418         PARA_DEBUG_LOG("udp sender init complete\n");
419 }