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