Simplify udp_send.c.
[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 #define UDP_CQ_BYTES 40000
72
73 static int udp_init_session(struct udp_target *ut)
74 {
75 int ret;
76
77 if (ut->fd >= 0) /* nothing to do */
78 return 0;
79 ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port,
80 conf.udp_ttl_arg);
81 if (ret < 0)
82 return ret;
83 ut->fd = ret;
84 ret = mark_fd_nonblocking(ut->fd);
85 if (ret < 0) {
86 close(ut->fd);
87 return ret;
88 }
89 add_close_on_fork_list(ut->fd);
90 ut->cq = cq_new(UDP_CQ_BYTES);
91 PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
92 return 1;
93 }
94
95 static void udp_send_buf(char *buf, size_t len)
96 {
97 struct udp_target *ut, *tmp;
98 int ret;
99
100 list_for_each_entry_safe(ut, tmp, &targets, node) {
101 ret = udp_init_session(ut);
102 if (ret < 0) {
103 udp_delete_target(ut, para_strerror(-ret));
104 continue;
105 }
106 ret = send_queued_chunks(ut->fd, ut->cq, 0);
107 if (ret < 0) {
108 udp_delete_target(ut, para_strerror(-ret));
109 continue;
110 }
111 if (!len)
112 continue;
113 if (!ret) { /* still data left in the queue */
114 ret = cq_enqueue(ut->cq, buf, len);
115 if (ret < 0) {
116 udp_delete_target(ut, para_strerror(-ret));
117 continue;
118 }
119 }
120 ret = write_nonblock(ut->fd, buf, len, 0);
121 if (ret < 0) {
122 udp_delete_target(ut, para_strerror(-ret));
123 continue;
124 }
125 if (ret != len) {
126 ret = cq_enqueue(ut->cq, buf + ret, len - ret);
127 if (ret < 0) {
128 udp_delete_target(ut, para_strerror(-ret));
129 continue;
130 }
131 }
132 }
133 }
134
135 static void udp_shutdown_targets(void)
136 {
137 char buf[UDP_AUDIO_HEADER_LEN];
138 struct udp_target *ut, *tmp;
139
140 udp_write_packet_type(buf, UDP_EOF_PACKET);
141 udp_write_magic(buf);
142 list_for_each_entry_safe(ut, tmp, &targets, node) {
143 if (ut->fd < 0)
144 continue;
145 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
146 udp_close_target(ut);
147 }
148 }
149
150 static int need_extra_header(long unsigned current_chunk)
151 {
152 static struct timeval last_header;
153 struct timeval diff;
154
155 if (!current_chunk)
156 return 0;
157 tv_diff(now, &last_header, &diff);
158 if (tv2ms(&diff) < conf.udp_header_interval_arg)
159 return 0;
160 last_header = *now;
161 return 1;
162 }
163
164 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
165 const char *buf, size_t len, const char *header_buf,
166 size_t header_len)
167 {
168 size_t sendbuf_len;
169 uint8_t packet_type = UDP_DATA_PACKET;
170 char *sendbuf;
171 struct timeval *chunk_tv;
172 uint8_t stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
173
174 // PARA_NOTICE_LOG("len: %zd, header_len: %zd\n", len, header_len);
175 if (sender_status != SENDER_ON)
176 return;
177
178 /* we might not yet know the chunk time */
179 chunk_tv = vss_chunk_time();
180 if (!chunk_tv)
181 return;
182 if (list_empty(&targets))
183 return;
184 if (!need_extra_header(current_chunk))
185 header_len = 0;
186 if (!current_chunk)
187 packet_type = UDP_BOF_PACKET;
188 else if (header_len)
189 packet_type = UDP_HEADER_PACKET;
190 sendbuf_len = UDP_AUDIO_HEADER_LEN + header_len + len;
191 sendbuf = para_malloc(sendbuf_len);
192 udp_write_magic(sendbuf);
193 udp_write_stream_type(sendbuf, stream_type);
194 udp_write_packet_type(sendbuf, packet_type);
195 udp_write_header_len(sendbuf, header_len);
196 if (header_len)
197 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
198 header_len);
199 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + header_len, buf, len);
200 udp_send_buf(sendbuf, sendbuf_len);
201 free(sendbuf);
202 }
203
204 static int udp_com_on(__a_unused struct sender_command_data *scd)
205 {
206 sender_status = SENDER_ON;
207 return 1;
208 }
209
210 static int udp_com_off(__a_unused struct sender_command_data *scd)
211 {
212 udp_shutdown_targets();
213 sender_status = SENDER_OFF;
214 return 1;
215 }
216
217 static int udp_com_delete(struct sender_command_data *scd)
218 {
219 char *a = para_strdup(inet_ntoa(scd->addr));
220 struct udp_target *ut, *tmp;
221 list_for_each_entry_safe(ut, tmp, &targets, node) {
222 if (scd->port != ut->port)
223 continue;
224 if (strcmp(TARGET_ADDR(ut), a))
225 continue;
226 udp_delete_target(ut, "com_delete");
227 }
228 return 1;
229 }
230
231 static void udp_add_target(int port, struct in_addr *addr)
232 {
233 struct udp_target *ut = para_calloc(sizeof(struct udp_target));
234 ut->port = port;
235 ut->addr = *addr;
236 ut->fd = -1; /* not yet connected */
237 PARA_INFO_LOG("adding to target list (%s:%d)\n",
238 TARGET_ADDR(ut), ut->port);
239 para_list_add(&ut->node, &targets);
240 }
241
242 static int udp_com_add(struct sender_command_data *scd)
243 {
244 int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
245 udp_add_target(port, &scd->addr);
246 return 1;
247 }
248
249 static char *udp_info(void)
250 {
251 struct udp_target *ut;
252 char *ret, *tgts = NULL;
253
254 list_for_each_entry(ut, &targets, node) {
255 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
256 TARGET_ADDR(ut), ut->port);
257 free(tgts);
258 tgts = tmp;
259 }
260 ret = make_message(
261 "udp sender:\n"
262 "\tstatus: %s\n"
263 "\tport: udp %d\n"
264 "\ttargets: %s\n",
265 (sender_status == SENDER_ON)? "on" : "off",
266 conf.udp_default_port_arg,
267 tgts? tgts : "(none)"
268 );
269 free(tgts);
270 return ret;
271 }
272
273 static void udp_init_target_list(void)
274 {
275 int i;
276
277 INIT_LIST_HEAD(&targets);
278 for (i = 0; i < conf.udp_target_given; i++) {
279 char *arg = para_strdup(conf.udp_target_arg[i]);
280 char *p = strchr(arg, ':');
281 int port;
282 struct in_addr addr;
283
284 if (!p)
285 goto err;
286 *p = '\0';
287 if (!inet_pton(AF_INET, arg, &addr))
288 goto err;
289 port = atoi(++p);
290 if (port < 0 || port > 65535)
291 port = conf.udp_default_port_arg;
292 udp_add_target(port, &addr);
293 goto success;
294 err:
295 PARA_CRIT_LOG("syntax error for udp target option "
296 "#%d, ignoring\n", i);
297 success:
298 free(arg);
299 continue;
300 }
301 }
302
303 static char *udp_help(void)
304 {
305 return make_message(
306 "usage: {on|off}\n"
307 "usage: {add|delete} IP port\n"
308 "example: add 224.0.1.38 8000 (multicast streaming)\n"
309 );
310 }
311
312 /**
313 * The init function of para_server's udp sender.
314 *
315 * \param s Pointer to the http sender struct.
316 *
317 * It initializes all function pointers of \a s and the list of udp targets.
318 */
319 void udp_send_init(struct sender *s)
320 {
321 INIT_LIST_HEAD(&targets);
322 s->info = udp_info;
323 s->help = udp_help;
324 s->send = udp_send;
325 s->pre_select = NULL;
326 s->post_select = NULL;
327 s->shutdown_clients = udp_shutdown_targets;
328 s->client_cmds[SENDER_ON] = udp_com_on;
329 s->client_cmds[SENDER_OFF] = udp_com_off;
330 s->client_cmds[SENDER_DENY] = NULL;
331 s->client_cmds[SENDER_ALLOW] = NULL;
332 s->client_cmds[SENDER_ADD] = udp_com_add;
333 s->client_cmds[SENDER_DELETE] = udp_com_delete;
334 sender_status = SENDER_OFF;
335 udp_init_target_list();
336 if (!conf.udp_no_autostart_given)
337 sender_status = SENDER_ON;
338 PARA_DEBUG_LOG("udp sender init complete\n");
339 }