upd_send: Add socket fd to close_on_fork list.
[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
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 };
45
46 static struct list_head targets;
47 static int sender_status;
48
49 static void udp_delete_target(struct udp_target *ut, const char *msg)
50 {
51 PARA_NOTICE_LOG("deleting %s:%d (%s) from list\n", TARGET_ADDR(ut),
52 ut->port, msg);
53 if (ut->fd >= 0) {
54 close(ut->fd);
55 del_close_on_fork_list(ut->fd);
56 }
57 list_del(&ut->node);
58 free(ut);
59 }
60
61 static void udp_send_buf(char *buf, size_t len)
62 {
63 struct udp_target *ut, *tmp;
64 int ret;
65
66 list_for_each_entry_safe(ut, tmp, &targets, node) {
67 if (ut->fd < 0)
68 continue;
69 ret = write_nonblock(ut->fd, buf, len, len);
70 if (ret < 0) /* TODO: Use chunk queueing */
71 return udp_delete_target(ut, "send error");
72 if (ret != len)
73 PARA_WARNING_LOG("short write %zu/%zu\n", ret, len);
74 }
75 }
76
77 static int udp_init_session(struct udp_target *ut)
78 {
79 int ret;
80
81 if (ut->fd >= 0) /* nothing to do */
82 return 0;
83 PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
84 ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port,
85 conf.udp_ttl_arg);
86 if (ret < 0)
87 return ret;
88 ut->fd = ret;
89 ret = mark_fd_nonblocking(ut->fd);
90 if (ret < 0) {
91 close(ut->fd);
92 return ret;
93 }
94 add_close_on_fork_list(ut->fd);
95 return 1;
96 }
97
98 static void udp_shutdown_targets(void)
99 {
100 char buf[UDP_AUDIO_HEADER_LEN];
101 struct udp_target *ut, *tmp;
102
103 udp_write_packet_type(buf, UDP_EOF_PACKET);
104 udp_write_magic(buf);
105 list_for_each_entry_safe(ut, tmp, &targets, node) {
106 if (ut->fd < 0)
107 continue;
108 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
109 close(ut->fd);
110 del_close_on_fork_list(ut->fd);
111 ut->fd = -1;
112 }
113 }
114
115 static int need_extra_header(long unsigned current_chunk)
116 {
117 static struct timeval last_header;
118 struct timeval diff;
119
120 if (!current_chunk)
121 return 0;
122 tv_diff(now, &last_header, &diff);
123 if (tv2ms(&diff) < conf.udp_header_interval_arg)
124 return 0;
125 last_header = *now;
126 return 1;
127 }
128
129 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
130 const char *buf, size_t len, const char *header_buf,
131 size_t header_len)
132 {
133 struct udp_target *ut, *tmp;
134 size_t sendbuf_len;
135 uint8_t packet_type = UDP_DATA_PACKET;
136 int ret;
137 char *sendbuf;
138 struct timeval *chunk_tv;
139 uint8_t stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
140
141 // PARA_NOTICE_LOG("header_len: %zd, header_buf: %p\n", header_len,
142 // header_buf);
143 if (sender_status != SENDER_ON)
144 return;
145
146 /* we might not yet know the chunk time */
147 chunk_tv = vss_chunk_time();
148 if (!chunk_tv)
149 return;
150 if (list_empty(&targets))
151 return;
152 list_for_each_entry_safe(ut, tmp, &targets, node) {
153 ret = udp_init_session(ut);
154 if (ret < 0)
155 udp_delete_target(ut, para_strerror(-ret));
156 }
157 if (!need_extra_header(current_chunk))
158 header_len = 0;
159 if (!current_chunk)
160 packet_type = UDP_BOF_PACKET;
161 else if (header_len)
162 packet_type = UDP_HEADER_PACKET;
163 sendbuf_len = UDP_AUDIO_HEADER_LEN + header_len + len;
164 sendbuf = para_malloc(sendbuf_len);
165 udp_write_magic(sendbuf);
166 udp_write_stream_type(sendbuf, stream_type);
167 udp_write_packet_type(sendbuf, packet_type);
168 udp_write_header_len(sendbuf, header_len);
169 if (header_len)
170 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
171 header_len);
172 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + header_len, buf, len);
173 udp_send_buf(sendbuf, sendbuf_len);
174 free(sendbuf);
175 }
176
177 static int udp_com_on(__a_unused struct sender_command_data *scd)
178 {
179 sender_status = SENDER_ON;
180 return 1;
181 }
182
183 static int udp_com_off(__a_unused struct sender_command_data *scd)
184 {
185 udp_shutdown_targets();
186 sender_status = SENDER_OFF;
187 return 1;
188 }
189
190 static int udp_com_delete(struct sender_command_data *scd)
191 {
192 char *a = para_strdup(inet_ntoa(scd->addr));
193 struct udp_target *ut, *tmp;
194 list_for_each_entry_safe(ut, tmp, &targets, node) {
195 if (scd->port != ut->port)
196 continue;
197 if (strcmp(TARGET_ADDR(ut), a))
198 continue;
199 udp_delete_target(ut, "com_delete");
200 }
201 return 1;
202 }
203
204 static void udp_add_target(int port, struct in_addr *addr)
205 {
206 struct udp_target *ut = para_calloc(sizeof(struct udp_target));
207 ut->port = port;
208 ut->addr = *addr;
209 ut->fd = -1; /* not yet connected */
210 PARA_INFO_LOG("adding to target list (%s:%d)\n",
211 TARGET_ADDR(ut), ut->port);
212 para_list_add(&ut->node, &targets);
213 }
214
215 static int udp_com_add(struct sender_command_data *scd)
216 {
217 int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
218 udp_add_target(port, &scd->addr);
219 return 1;
220 }
221
222 static char *udp_info(void)
223 {
224 struct udp_target *ut;
225 char *ret, *tgts = NULL;
226
227 list_for_each_entry(ut, &targets, node) {
228 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
229 TARGET_ADDR(ut), ut->port);
230 free(tgts);
231 tgts = tmp;
232 }
233 ret = make_message(
234 "udp sender:\n"
235 "\tstatus: %s\n"
236 "\tport: udp %d\n"
237 "\ttargets: %s\n",
238 (sender_status == SENDER_ON)? "on" : "off",
239 conf.udp_default_port_arg,
240 tgts? tgts : "(none)"
241 );
242 free(tgts);
243 return ret;
244 }
245
246 static void udp_init_target_list(void)
247 {
248 int i;
249
250 INIT_LIST_HEAD(&targets);
251 for (i = 0; i < conf.udp_target_given; i++) {
252 char *arg = para_strdup(conf.udp_target_arg[i]);
253 char *p = strchr(arg, ':');
254 int port;
255 struct in_addr addr;
256
257 if (!p)
258 goto err;
259 *p = '\0';
260 if (!inet_pton(AF_INET, arg, &addr))
261 goto err;
262 port = atoi(++p);
263 if (port < 0 || port > 65535)
264 port = conf.udp_default_port_arg;
265 udp_add_target(port, &addr);
266 goto success;
267 err:
268 PARA_CRIT_LOG("syntax error for udp target option "
269 "#%d, ignoring\n", i);
270 success:
271 free(arg);
272 continue;
273 }
274 }
275
276 static char *udp_help(void)
277 {
278 return make_message(
279 "usage: {on|off}\n"
280 "usage: {add|delete} IP port\n"
281 "example: add 224.0.1.38 8000 (multicast streaming)\n"
282 );
283 }
284
285 /**
286 * The init function of para_server's udp sender.
287 *
288 * \param s Pointer to the http sender struct.
289 *
290 * It initializes all function pointers of \a s and the list of udp targets.
291 */
292 void udp_send_init(struct sender *s)
293 {
294 INIT_LIST_HEAD(&targets);
295 s->info = udp_info;
296 s->help = udp_help;
297 s->send = udp_send;
298 s->pre_select = NULL;
299 s->post_select = NULL;
300 s->shutdown_clients = udp_shutdown_targets;
301 s->client_cmds[SENDER_ON] = udp_com_on;
302 s->client_cmds[SENDER_OFF] = udp_com_off;
303 s->client_cmds[SENDER_DENY] = NULL;
304 s->client_cmds[SENDER_ALLOW] = NULL;
305 s->client_cmds[SENDER_ADD] = udp_com_add;
306 s->client_cmds[SENDER_DELETE] = udp_com_delete;
307 sender_status = SENDER_OFF;
308 udp_init_target_list();
309 if (!conf.udp_no_autostart_given)
310 sender_status = SENDER_ON;
311 PARA_DEBUG_LOG("udp sender init complete\n");
312 }