7704b0a1a8f01b1580bae58c59a2817ca324371e
[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 static void udp_send_buf(char *buf, size_t len)
72 {
73 struct udp_target *ut, *tmp;
74 int ret;
75
76 list_for_each_entry_safe(ut, tmp, &targets, node) {
77 if (ut->fd < 0)
78 continue;
79 ret = write_nonblock(ut->fd, buf, len, len);
80 if (ret < 0) {
81 udp_delete_target(ut, para_strerror(-ret));
82 continue;
83 }
84 if (ret != len)
85 PARA_WARNING_LOG("short write %zu/%zu\n", ret, len);
86 }
87 }
88
89 #define UDP_CQ_BYTES 40000
90
91 static int udp_init_session(struct udp_target *ut)
92 {
93 int ret;
94
95 if (ut->fd >= 0) /* nothing to do */
96 return 0;
97 PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
98 ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port,
99 conf.udp_ttl_arg);
100 if (ret < 0)
101 return ret;
102 ut->fd = ret;
103 ret = mark_fd_nonblocking(ut->fd);
104 if (ret < 0) {
105 close(ut->fd);
106 return ret;
107 }
108 add_close_on_fork_list(ut->fd);
109 ut->cq = cq_new(UDP_CQ_BYTES);
110 return 1;
111 }
112
113 static void udp_shutdown_targets(void)
114 {
115 char buf[UDP_AUDIO_HEADER_LEN];
116 struct udp_target *ut, *tmp;
117
118 udp_write_packet_type(buf, UDP_EOF_PACKET);
119 udp_write_magic(buf);
120 list_for_each_entry_safe(ut, tmp, &targets, node) {
121 if (ut->fd < 0)
122 continue;
123 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
124 udp_close_target(ut);
125 }
126 }
127
128 static int need_extra_header(long unsigned current_chunk)
129 {
130 static struct timeval last_header;
131 struct timeval diff;
132
133 if (!current_chunk)
134 return 0;
135 tv_diff(now, &last_header, &diff);
136 if (tv2ms(&diff) < conf.udp_header_interval_arg)
137 return 0;
138 last_header = *now;
139 return 1;
140 }
141
142 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
143 const char *buf, size_t len, const char *header_buf,
144 size_t header_len)
145 {
146 struct udp_target *ut, *tmp;
147 size_t sendbuf_len;
148 uint8_t packet_type = UDP_DATA_PACKET;
149 int ret;
150 char *sendbuf;
151 struct timeval *chunk_tv;
152 uint8_t stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
153
154 // PARA_NOTICE_LOG("header_len: %zd, header_buf: %p\n", header_len,
155 // header_buf);
156 if (sender_status != SENDER_ON)
157 return;
158
159 /* we might not yet know the chunk time */
160 chunk_tv = vss_chunk_time();
161 if (!chunk_tv)
162 return;
163 if (list_empty(&targets))
164 return;
165 list_for_each_entry_safe(ut, tmp, &targets, node) {
166 ret = udp_init_session(ut);
167 if (ret < 0)
168 udp_delete_target(ut, para_strerror(-ret));
169 }
170 if (!need_extra_header(current_chunk))
171 header_len = 0;
172 if (!current_chunk)
173 packet_type = UDP_BOF_PACKET;
174 else if (header_len)
175 packet_type = UDP_HEADER_PACKET;
176 sendbuf_len = UDP_AUDIO_HEADER_LEN + header_len + len;
177 sendbuf = para_malloc(sendbuf_len);
178 udp_write_magic(sendbuf);
179 udp_write_stream_type(sendbuf, stream_type);
180 udp_write_packet_type(sendbuf, packet_type);
181 udp_write_header_len(sendbuf, header_len);
182 if (header_len)
183 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
184 header_len);
185 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + header_len, buf, len);
186 udp_send_buf(sendbuf, sendbuf_len);
187 free(sendbuf);
188 }
189
190 static int udp_com_on(__a_unused struct sender_command_data *scd)
191 {
192 sender_status = SENDER_ON;
193 return 1;
194 }
195
196 static int udp_com_off(__a_unused struct sender_command_data *scd)
197 {
198 udp_shutdown_targets();
199 sender_status = SENDER_OFF;
200 return 1;
201 }
202
203 static int udp_com_delete(struct sender_command_data *scd)
204 {
205 char *a = para_strdup(inet_ntoa(scd->addr));
206 struct udp_target *ut, *tmp;
207 list_for_each_entry_safe(ut, tmp, &targets, node) {
208 if (scd->port != ut->port)
209 continue;
210 if (strcmp(TARGET_ADDR(ut), a))
211 continue;
212 udp_delete_target(ut, "com_delete");
213 }
214 return 1;
215 }
216
217 static void udp_add_target(int port, struct in_addr *addr)
218 {
219 struct udp_target *ut = para_calloc(sizeof(struct udp_target));
220 ut->port = port;
221 ut->addr = *addr;
222 ut->fd = -1; /* not yet connected */
223 PARA_INFO_LOG("adding to target list (%s:%d)\n",
224 TARGET_ADDR(ut), ut->port);
225 para_list_add(&ut->node, &targets);
226 }
227
228 static int udp_com_add(struct sender_command_data *scd)
229 {
230 int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
231 udp_add_target(port, &scd->addr);
232 return 1;
233 }
234
235 static char *udp_info(void)
236 {
237 struct udp_target *ut;
238 char *ret, *tgts = NULL;
239
240 list_for_each_entry(ut, &targets, node) {
241 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
242 TARGET_ADDR(ut), ut->port);
243 free(tgts);
244 tgts = tmp;
245 }
246 ret = make_message(
247 "udp sender:\n"
248 "\tstatus: %s\n"
249 "\tport: udp %d\n"
250 "\ttargets: %s\n",
251 (sender_status == SENDER_ON)? "on" : "off",
252 conf.udp_default_port_arg,
253 tgts? tgts : "(none)"
254 );
255 free(tgts);
256 return ret;
257 }
258
259 static void udp_init_target_list(void)
260 {
261 int i;
262
263 INIT_LIST_HEAD(&targets);
264 for (i = 0; i < conf.udp_target_given; i++) {
265 char *arg = para_strdup(conf.udp_target_arg[i]);
266 char *p = strchr(arg, ':');
267 int port;
268 struct in_addr addr;
269
270 if (!p)
271 goto err;
272 *p = '\0';
273 if (!inet_pton(AF_INET, arg, &addr))
274 goto err;
275 port = atoi(++p);
276 if (port < 0 || port > 65535)
277 port = conf.udp_default_port_arg;
278 udp_add_target(port, &addr);
279 goto success;
280 err:
281 PARA_CRIT_LOG("syntax error for udp target option "
282 "#%d, ignoring\n", i);
283 success:
284 free(arg);
285 continue;
286 }
287 }
288
289 static char *udp_help(void)
290 {
291 return make_message(
292 "usage: {on|off}\n"
293 "usage: {add|delete} IP port\n"
294 "example: add 224.0.1.38 8000 (multicast streaming)\n"
295 );
296 }
297
298 /**
299 * The init function of para_server's udp sender.
300 *
301 * \param s Pointer to the http sender struct.
302 *
303 * It initializes all function pointers of \a s and the list of udp targets.
304 */
305 void udp_send_init(struct sender *s)
306 {
307 INIT_LIST_HEAD(&targets);
308 s->info = udp_info;
309 s->help = udp_help;
310 s->send = udp_send;
311 s->pre_select = NULL;
312 s->post_select = NULL;
313 s->shutdown_clients = udp_shutdown_targets;
314 s->client_cmds[SENDER_ON] = udp_com_on;
315 s->client_cmds[SENDER_OFF] = udp_com_off;
316 s->client_cmds[SENDER_DENY] = NULL;
317 s->client_cmds[SENDER_ALLOW] = NULL;
318 s->client_cmds[SENDER_ADD] = udp_com_add;
319 s->client_cmds[SENDER_DELETE] = udp_com_delete;
320 sender_status = SENDER_OFF;
321 udp_init_target_list();
322 if (!conf.udp_no_autostart_given)
323 sender_status = SENDER_ON;
324 PARA_DEBUG_LOG("udp sender init complete\n");
325 }