Merge commit 'athcx/master'
[paraslash.git] / udp_send.c
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 /** Convert in_addr to ascii. */
32 #define TARGET_ADDR(oc) inet_ntoa((oc)->addr)
33
34 /** Describes one entry in the list of targets for the udp sender. */
35 struct udp_target {
36 /** Address info. */
37 struct in_addr addr;
38 /** The position of this target in the list of targets. */
39 struct list_head node;
40 /** The UDP port. */
41 int port;
42 /** The socket fd. */
43 int fd;
44 /** The list of queued chunks for this fd. */
45 struct chunk_queue *cq;
46 };
47
48 static struct list_head targets;
49 static int sender_status;
50
51 static void udp_close_target(struct udp_target *ut)
52 {
53 if (ut->fd < 0)
54 return;
55 close(ut->fd);
56 del_close_on_fork_list(ut->fd);
57 cq_destroy(ut->cq);
58 ut->cq = NULL;
59 ut->fd = -1;
60 }
61
62 static void udp_delete_target(struct udp_target *ut, const char *msg)
63 {
64 PARA_NOTICE_LOG("deleting %s:%d (%s) from list\n", TARGET_ADDR(ut),
65 ut->port, msg);
66 udp_close_target(ut);
67 list_del(&ut->node);
68 free(ut);
69 }
70
71 /** The maximal size of the per-target chunk queue. */
72 #define UDP_CQ_BYTES 40000
73
74 static int udp_init_session(struct udp_target *ut)
75 {
76 int ret;
77
78 if (ut->fd >= 0) /* nothing to do */
79 return 0;
80 ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port,
81 conf.udp_ttl_arg);
82 if (ret < 0)
83 return ret;
84 ut->fd = ret;
85 ret = mark_fd_nonblocking(ut->fd);
86 if (ret < 0) {
87 close(ut->fd);
88 return ret;
89 }
90 add_close_on_fork_list(ut->fd);
91 ut->cq = cq_new(UDP_CQ_BYTES);
92 PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
93 return 1;
94 }
95
96 static void udp_send_buf(char *buf, size_t len)
97 {
98 struct udp_target *ut, *tmp;
99 int ret;
100
101 list_for_each_entry_safe(ut, tmp, &targets, node) {
102 ret = udp_init_session(ut);
103 if (ret < 0) {
104 udp_delete_target(ut, para_strerror(-ret));
105 continue;
106 }
107 ret = send_queued_chunks(ut->fd, ut->cq, 0);
108 if (ret < 0) {
109 udp_delete_target(ut, para_strerror(-ret));
110 continue;
111 }
112 if (!len)
113 continue;
114 if (!ret) { /* still data left in the queue */
115 ret = cq_enqueue(ut->cq, buf, len);
116 if (ret < 0) {
117 udp_delete_target(ut, para_strerror(-ret));
118 continue;
119 }
120 }
121 ret = write_nonblock(ut->fd, buf, len, 0);
122 if (ret < 0) {
123 udp_delete_target(ut, para_strerror(-ret));
124 continue;
125 }
126 if (ret != len) {
127 ret = cq_enqueue(ut->cq, buf + ret, len - ret);
128 if (ret < 0) {
129 udp_delete_target(ut, para_strerror(-ret));
130 continue;
131 }
132 }
133 }
134 }
135
136 static void udp_shutdown_targets(void)
137 {
138 char buf[UDP_AUDIO_HEADER_LEN];
139 struct udp_target *ut, *tmp;
140 struct udp_audio_header uah = {
141 .stream_type = UDP_UNKNOWN_STREAM,
142 .packet_type = UDP_EOF_PACKET,
143 };
144
145 write_udp_audio_header(buf, &uah);
146 list_for_each_entry_safe(ut, tmp, &targets, node) {
147 if (ut->fd < 0)
148 continue;
149 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
150 udp_close_target(ut);
151 }
152 }
153
154 static int need_extra_header(long unsigned current_chunk)
155 {
156 static struct timeval last_header;
157 struct timeval diff;
158
159 if (!current_chunk)
160 return 0;
161 tv_diff(now, &last_header, &diff);
162 if (tv2ms(&diff) < conf.udp_header_interval_arg)
163 return 0;
164 last_header = *now;
165 return 1;
166 }
167
168 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
169 const char *buf, size_t len, const char *header_buf,
170 size_t header_len)
171 {
172 char *sendbuf;
173 size_t sendbuf_len;
174 struct timeval *chunk_tv;
175 struct udp_audio_header uah;
176
177 // PARA_NOTICE_LOG("len: %zd, header_len: %zd\n", len, header_len);
178 if (sender_status != SENDER_ON)
179 return;
180
181 /* we might not yet know the chunk time */
182 chunk_tv = vss_chunk_time();
183 if (!chunk_tv)
184 return;
185 if (list_empty(&targets))
186 return;
187 uah.stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
188 uah.header_len = need_extra_header(current_chunk)? header_len : 0;
189 if (!current_chunk)
190 uah.packet_type = UDP_BOF_PACKET;
191 else if (uah.header_len)
192 uah.packet_type = UDP_HEADER_PACKET;
193 else
194 uah.packet_type = UDP_DATA_PACKET;
195 uah.payload_len = uah.header_len + len;
196 sendbuf_len = UDP_AUDIO_HEADER_LEN + uah.payload_len;
197 sendbuf = para_malloc(sendbuf_len);
198 write_udp_audio_header(sendbuf, &uah);
199 if (uah.header_len)
200 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
201 uah.header_len);
202 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + uah.header_len, buf, len);
203 udp_send_buf(sendbuf, sendbuf_len);
204 free(sendbuf);
205 }
206
207 static int udp_com_on(__a_unused struct sender_command_data *scd)
208 {
209 sender_status = SENDER_ON;
210 return 1;
211 }
212
213 static int udp_com_off(__a_unused struct sender_command_data *scd)
214 {
215 udp_shutdown_targets();
216 sender_status = SENDER_OFF;
217 return 1;
218 }
219
220 static int udp_com_delete(struct sender_command_data *scd)
221 {
222 char *a = para_strdup(inet_ntoa(scd->addr));
223 struct udp_target *ut, *tmp;
224 list_for_each_entry_safe(ut, tmp, &targets, node) {
225 if (scd->port != ut->port)
226 continue;
227 if (strcmp(TARGET_ADDR(ut), a))
228 continue;
229 udp_delete_target(ut, "com_delete");
230 }
231 return 1;
232 }
233
234 static void udp_add_target(int port, struct in_addr *addr)
235 {
236 struct udp_target *ut = para_calloc(sizeof(struct udp_target));
237 ut->port = port;
238 ut->addr = *addr;
239 ut->fd = -1; /* not yet connected */
240 PARA_INFO_LOG("adding to target list (%s:%d)\n",
241 TARGET_ADDR(ut), ut->port);
242 para_list_add(&ut->node, &targets);
243 }
244
245 static int udp_com_add(struct sender_command_data *scd)
246 {
247 int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
248 udp_add_target(port, &scd->addr);
249 return 1;
250 }
251
252 static char *udp_info(void)
253 {
254 struct udp_target *ut;
255 char *ret, *tgts = NULL;
256
257 list_for_each_entry(ut, &targets, node) {
258 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
259 TARGET_ADDR(ut), ut->port);
260 free(tgts);
261 tgts = tmp;
262 }
263 ret = make_message(
264 "udp sender:\n"
265 "\tstatus: %s\n"
266 "\tport: udp %d\n"
267 "\ttargets: %s\n",
268 (sender_status == SENDER_ON)? "on" : "off",
269 conf.udp_default_port_arg,
270 tgts? tgts : "(none)"
271 );
272 free(tgts);
273 return ret;
274 }
275
276 static void udp_init_target_list(void)
277 {
278 int i;
279
280 INIT_LIST_HEAD(&targets);
281 for (i = 0; i < conf.udp_target_given; i++) {
282 char *arg = para_strdup(conf.udp_target_arg[i]);
283 char *p = strchr(arg, ':');
284 int port;
285 struct in_addr addr;
286
287 if (!p)
288 goto err;
289 *p = '\0';
290 if (!inet_pton(AF_INET, arg, &addr))
291 goto err;
292 port = atoi(++p);
293 if (port < 0 || port > 65535)
294 port = conf.udp_default_port_arg;
295 udp_add_target(port, &addr);
296 goto success;
297 err:
298 PARA_CRIT_LOG("syntax error for udp target option "
299 "#%d, ignoring\n", i);
300 success:
301 free(arg);
302 continue;
303 }
304 }
305
306 static char *udp_help(void)
307 {
308 return make_message(
309 "usage: {on|off}\n"
310 "usage: {add|delete} IP port\n"
311 "example: add 224.0.1.38 8000 (multicast streaming)\n"
312 );
313 }
314
315 /**
316 * The init function of para_server's udp sender.
317 *
318 * \param s Pointer to the http sender struct.
319 *
320 * It initializes all function pointers of \a s and the list of udp targets.
321 */
322 void udp_send_init(struct sender *s)
323 {
324 INIT_LIST_HEAD(&targets);
325 s->info = udp_info;
326 s->help = udp_help;
327 s->send = udp_send;
328 s->pre_select = NULL;
329 s->post_select = NULL;
330 s->shutdown_clients = udp_shutdown_targets;
331 s->client_cmds[SENDER_ON] = udp_com_on;
332 s->client_cmds[SENDER_OFF] = udp_com_off;
333 s->client_cmds[SENDER_DENY] = NULL;
334 s->client_cmds[SENDER_ALLOW] = NULL;
335 s->client_cmds[SENDER_ADD] = udp_com_add;
336 s->client_cmds[SENDER_DELETE] = udp_com_delete;
337 sender_status = SENDER_OFF;
338 udp_init_target_list();
339 if (!conf.udp_no_autostart_given)
340 sender_status = SENDER_ON;
341 PARA_DEBUG_LOG("udp sender init complete\n");
342 }