udp sender: Make ttl configurable.
[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
29
30 /** Convert in_addr to ascii. */
31 #define TARGET_ADDR(oc) inet_ntoa((oc)->addr)
32
33 /** Describes one entry in the list of targets for the udp sender. */
34 struct udp_target {
35 /** Address info. */
36 struct in_addr addr;
37 /** The position of this target in the list of targets. */
38 struct list_head node;
39 /** The UDP port. */
40 int port;
41 /** The socket fd. */
42 int fd;
43 };
44
45 static struct list_head targets;
46 static int sender_status;
47
48 static void udp_delete_target(struct udp_target *ut, const char *msg)
49 {
50 PARA_NOTICE_LOG("deleting %s:%d (%s) from list\n", TARGET_ADDR(ut),
51 ut->port, msg);
52 if (ut->fd >= 0)
53 close(ut->fd);
54 list_del(&ut->node);
55 free(ut);
56 }
57
58 static void udp_send_buf(char *buf, size_t len)
59 {
60 struct udp_target *ut, *tmp;
61 int ret;
62
63 list_for_each_entry_safe(ut, tmp, &targets, node) {
64 size_t written = len;
65 if (ut->fd < 0)
66 continue;
67 ret = write_all(ut->fd, buf, &written);
68 if (ret < 0) /* TODO: Use chunk queueing */
69 return udp_delete_target(ut, "send error");
70 if (written != len)
71 PARA_WARNING_LOG("short write %zu/%zu\n", written, len);
72 }
73 }
74
75 static int udp_init_session(struct udp_target *ut)
76 {
77 int ret;
78
79 if (ut->fd >= 0) /* nothing to do */
80 return 0;
81 PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
82 ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port,
83 conf.udp_ttl_arg);
84 if (ret < 0)
85 return ret;
86 ut->fd = ret;
87 return mark_fd_nonblocking(ut->fd);
88 }
89
90 static void udp_shutdown_targets(void)
91 {
92 char buf[UDP_AUDIO_HEADER_LEN];
93 struct udp_target *ut, *tmp;
94
95 udp_write_packet_type(buf, UDP_EOF_PACKET);
96 udp_write_magic(buf);
97 list_for_each_entry_safe(ut, tmp, &targets, node) {
98 if (ut->fd < 0)
99 continue;
100 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
101 close(ut->fd);
102 ut->fd = -1;
103 }
104 }
105
106 static int need_extra_header(long unsigned current_chunk)
107 {
108 static struct timeval last_header;
109 struct timeval diff;
110
111 if (!current_chunk)
112 return 0;
113 tv_diff(now, &last_header, &diff);
114 if (tv2ms(&diff) < conf.udp_header_interval_arg)
115 return 0;
116 last_header = *now;
117 return 1;
118 }
119
120 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
121 const char *buf, size_t len, const char *header_buf,
122 size_t header_len)
123 {
124 struct udp_target *ut, *tmp;
125 size_t sendbuf_len;
126 uint8_t packet_type = UDP_DATA_PACKET;
127 int ret;
128 char *sendbuf;
129 struct timeval *chunk_tv;
130 uint8_t stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
131
132 // PARA_NOTICE_LOG("header_len: %zd, header_buf: %p\n", header_len,
133 // header_buf);
134 if (sender_status != SENDER_ON)
135 return;
136
137 /* we might not yet know the chunk time */
138 chunk_tv = vss_chunk_time();
139 if (!chunk_tv)
140 return;
141 if (list_empty(&targets))
142 return;
143 list_for_each_entry_safe(ut, tmp, &targets, node) {
144 ret = udp_init_session(ut);
145 if (ret < 0)
146 udp_delete_target(ut, para_strerror(-ret));
147 }
148 if (!need_extra_header(current_chunk))
149 header_len = 0;
150 if (!current_chunk)
151 packet_type = UDP_BOF_PACKET;
152 else if (header_len)
153 packet_type = UDP_HEADER_PACKET;
154 sendbuf_len = UDP_AUDIO_HEADER_LEN + header_len + len;
155 sendbuf = para_malloc(sendbuf_len);
156 udp_write_magic(sendbuf);
157 udp_write_stream_type(sendbuf, stream_type);
158 udp_write_packet_type(sendbuf, packet_type);
159 udp_write_header_len(sendbuf, header_len);
160 if (header_len)
161 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
162 header_len);
163 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + header_len, buf, len);
164 udp_send_buf(sendbuf, sendbuf_len);
165 free(sendbuf);
166 }
167
168 static int udp_com_on(__a_unused struct sender_command_data *scd)
169 {
170 sender_status = SENDER_ON;
171 return 1;
172 }
173
174 static int udp_com_off(__a_unused struct sender_command_data *scd)
175 {
176 udp_shutdown_targets();
177 sender_status = SENDER_OFF;
178 return 1;
179 }
180
181 static int udp_com_delete(struct sender_command_data *scd)
182 {
183 char *a = para_strdup(inet_ntoa(scd->addr));
184 struct udp_target *ut, *tmp;
185 list_for_each_entry_safe(ut, tmp, &targets, node) {
186 if (scd->port != ut->port)
187 continue;
188 if (strcmp(TARGET_ADDR(ut), a))
189 continue;
190 udp_delete_target(ut, "com_delete");
191 }
192 return 1;
193 }
194
195 static void udp_add_target(int port, struct in_addr *addr)
196 {
197 struct udp_target *ut = para_calloc(sizeof(struct udp_target));
198 ut->port = port;
199 ut->addr = *addr;
200 ut->fd = -1; /* not yet connected */
201 PARA_INFO_LOG("adding to target list (%s:%d)\n",
202 TARGET_ADDR(ut), ut->port);
203 para_list_add(&ut->node, &targets);
204 }
205
206 static int udp_com_add(struct sender_command_data *scd)
207 {
208 int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
209 udp_add_target(port, &scd->addr);
210 return 1;
211 }
212
213 static char *udp_info(void)
214 {
215 struct udp_target *ut;
216 char *ret, *tgts = NULL;
217
218 list_for_each_entry(ut, &targets, node) {
219 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
220 TARGET_ADDR(ut), ut->port);
221 free(tgts);
222 tgts = tmp;
223 }
224 ret = make_message(
225 "udp sender:\n"
226 "\tstatus: %s\n"
227 "\tport: udp %d\n"
228 "\ttargets: %s\n",
229 (sender_status == SENDER_ON)? "on" : "off",
230 conf.udp_default_port_arg,
231 tgts? tgts : "(none)"
232 );
233 free(tgts);
234 return ret;
235 }
236
237 static void udp_init_target_list(void)
238 {
239 int i;
240
241 INIT_LIST_HEAD(&targets);
242 for (i = 0; i < conf.udp_target_given; i++) {
243 char *arg = para_strdup(conf.udp_target_arg[i]);
244 char *p = strchr(arg, ':');
245 int port;
246 struct in_addr addr;
247
248 if (!p)
249 goto err;
250 *p = '\0';
251 if (!inet_pton(AF_INET, arg, &addr))
252 goto err;
253 port = atoi(++p);
254 if (port < 0 || port > 65535)
255 port = conf.udp_default_port_arg;
256 udp_add_target(port, &addr);
257 goto success;
258 err:
259 PARA_CRIT_LOG("syntax error for udp target option "
260 "#%d, ignoring\n", i);
261 success:
262 free(arg);
263 continue;
264 }
265 }
266
267 static char *udp_help(void)
268 {
269 return make_message(
270 "usage: {on|off}\n"
271 "usage: {add|delete} IP port\n"
272 "example: add 224.0.1.38 8000 (multicast streaming)\n"
273 );
274 }
275
276 /**
277 * The init function of para_server's udp sender.
278 *
279 * \param s Pointer to the http sender struct.
280 *
281 * It initializes all function pointers of \a s and the list of udp targets.
282 */
283 void udp_send_init(struct sender *s)
284 {
285 INIT_LIST_HEAD(&targets);
286 s->info = udp_info;
287 s->help = udp_help;
288 s->send = udp_send;
289 s->pre_select = NULL;
290 s->post_select = NULL;
291 s->shutdown_clients = udp_shutdown_targets;
292 s->client_cmds[SENDER_ON] = udp_com_on;
293 s->client_cmds[SENDER_OFF] = udp_com_off;
294 s->client_cmds[SENDER_DENY] = NULL;
295 s->client_cmds[SENDER_ALLOW] = NULL;
296 s->client_cmds[SENDER_ADD] = udp_com_add;
297 s->client_cmds[SENDER_DELETE] = udp_com_delete;
298 sender_status = SENDER_OFF;
299 udp_init_target_list();
300 if (!conf.udp_no_autostart_given)
301 sender_status = SENDER_ON;
302 PARA_DEBUG_LOG("udp sender init complete\n");
303 }