udp_send: Fix com_off.
[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 #include <sys/socket.h>
13 #include <net/if.h>
14
15 #include "server.cmdline.h"
16 #include "para.h"
17 #include "error.h"
18 #include "string.h"
19 #include "afh.h"
20 #include "afs.h"
21 #include "server.h"
22 #include "vss.h"
23 #include "list.h"
24 #include "send.h"
25 #include "portable_io.h"
26 #include "net.h"
27 #include "fd.h"
28 #include "sched.h"
29 #include "close_on_fork.h"
30 #include "chunk_queue.h"
31
32 /** Describes one entry in the list of targets for the udp sender. */
33 struct udp_target {
34 /** The position of this target in the list of targets. */
35 struct list_head node;
36 /** The hostname (DNS name or IPv4/v6 address string). */
37 char host[MAX_HOSTLEN];
38 /** The UDP port. */
39 int port;
40 /** The socket fd. */
41 int fd;
42 /** The list of queued chunks for this fd. */
43 struct chunk_queue *cq;
44 /** The opaque structure returned by vss_add_fec_client(). */
45 struct fec_client *fc;
46 /** The FEC parameters for this target. */
47 struct fec_client_parms fcp;
48 };
49
50 static struct list_head targets;
51 static int sender_status;
52
53 static void udp_close_target(struct udp_target *ut)
54 {
55 if (ut->fd < 0)
56 return;
57 close(ut->fd);
58 del_close_on_fork_list(ut->fd);
59 cq_destroy(ut->cq);
60 ut->cq = NULL;
61 ut->fd = -1;
62 }
63
64 static void udp_delete_target(struct udp_target *ut, const char *msg)
65 {
66 PARA_NOTICE_LOG("deleting %s#%d (%s) from list\n", ut->host,
67 ut->port, msg);
68 udp_close_target(ut);
69 vss_del_fec_client(ut->fc);
70 list_del(&ut->node);
71 free(ut);
72 }
73
74 /**
75 * Perform AF-independent multicast sender setup.
76 *
77 * \param fd The connected socket descriptor.
78 * \param ttl UDPv4 multicast TTL or UDPv6 multicast number of hops.
79 * Use -1 to mean default, 0..255 otherwise.
80 * \param iface The outgoing multicast interface, or NULL for the default.
81 *
82 * \return Zero if okay, negative on error.
83 */
84 static int mcast_sender_setup(struct udp_target *ut, int ttl, char *iface)
85 {
86 struct sockaddr_storage ss;
87 socklen_t sslen = sizeof(ss);
88
89 const int on = 1;
90 int id = iface == NULL ? 0 : if_nametoindex(iface);
91
92 if (getpeername(ut->fd, (struct sockaddr *)&ss, &sslen) < 0)
93 goto err;
94
95 if (iface != NULL && id == 0)
96 PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
97
98 /* RFC 3493, 5.2: -1 means 'use kernel default' */
99 if (ttl < 0 || ttl > 255)
100 ttl = -1;
101
102 switch (ss.ss_family) {
103 case AF_INET:
104 if (!IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr)))
105 return 0;
106 if (id != 0) {
107 #ifdef HAVE_IP_MREQN
108 struct ip_mreqn mn;
109
110 memset(&mn, 0, sizeof(mn));
111 mn.imr_ifindex = id;
112 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_IF, &mn, sizeof(mn)) < 0)
113 goto err;
114 #else
115 PARA_ERROR_LOG("No support for setting outgoing IPv4 mcast interface.");
116 #endif
117 }
118 /*
119 * Enable receiving multicast messages generated on the local host
120 * At least on Linux, this is enabled by default.
121 */
122 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_LOOP, &on, sizeof(on)) < 0)
123 break;
124
125 /* Default: use local subnet (do not flood out into the WAN) */
126 if (ttl == -1)
127 ttl = 1;
128 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
129 break;
130 return 0;
131 case AF_INET6:
132 if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr))
133 return 0;
134 if (id != 0 &&
135 setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &id, sizeof(id)) < 0)
136 break;
137 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &on, sizeof(on)) < 0)
138 break;
139 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
140 break;
141 return 0;
142 default:
143 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
144 return -E_ADDRESS_LOOKUP;
145 }
146 err:
147 return -ERRNO_TO_PARA_ERROR(errno);
148 }
149
150 /** The maximal size of the per-target chunk queue. */
151 #define UDP_CQ_BYTES 40000
152
153 static int udp_init_session(struct udp_target *ut)
154 {
155 int ret;
156 char *iface = NULL;
157
158 if (ut->fd >= 0) /* nothing to do */
159 return 0;
160
161 ret = makesock(AF_UNSPEC, IPPROTO_UDP, 0, ut->host, ut->port);
162 if (ret < 0)
163 return ret;
164 ut->fd = ret;
165
166 if (conf.udp_mcast_iface_given)
167 iface = conf.udp_mcast_iface_arg;
168
169 ret = mcast_sender_setup(ut, conf.udp_ttl_arg, iface);
170 if (ret < 0) {
171 close(ut->fd);
172 return ret;
173 }
174
175 ret = mark_fd_nonblocking(ut->fd);
176 if (ret < 0) {
177 close(ut->fd);
178 return ret;
179 }
180 add_close_on_fork_list(ut->fd);
181 ut->cq = cq_new(UDP_CQ_BYTES);
182 PARA_NOTICE_LOG("sending to udp %s#%d\n", ut->host, ut->port);
183 return 1;
184 }
185
186 static void udp_shutdown_targets(void)
187 {
188 struct udp_target *ut, *tmp;
189 const char *buf = NULL;
190 size_t len = 0; /* STFU, gcc */
191
192 list_for_each_entry_safe(ut, tmp, &targets, node) {
193 if (ut->fd < 0)
194 continue;
195 if (!buf)
196 len = vss_get_fec_eof_packet(&buf);
197 write(ut->fd, buf, len);
198 udp_close_target(ut);
199 }
200 }
201
202 static int udp_com_on(__a_unused struct sender_command_data *scd)
203 {
204 sender_status = SENDER_ON;
205 return 1;
206 }
207
208 static int udp_com_off(__a_unused struct sender_command_data *scd)
209 {
210 udp_shutdown_targets();
211 sender_status = SENDER_OFF;
212 return 1;
213 }
214
215 static int udp_com_delete(struct sender_command_data *scd)
216 {
217 struct udp_target *ut, *tmp;
218
219 list_for_each_entry_safe(ut, tmp, &targets, node) {
220 /* Unspecified port means wildcard port match */
221 if (scd->port > 0 && scd->port != ut->port)
222 continue;
223 if (strcmp(ut->host, scd->host))
224 continue;
225 udp_delete_target(ut, "com_delete");
226 }
227 return 1;
228 }
229
230 static int udp_send_fec(char *buf, size_t len, void *private_data)
231 {
232 struct udp_target *ut = private_data;
233 int ret;
234
235 if (sender_status == SENDER_OFF)
236 return 0;
237 ret = udp_init_session(ut);
238 if (ret < 0)
239 goto fail;
240 ret = send_queued_chunks(ut->fd, ut->cq, 0);
241 if (ret < 0)
242 goto fail;
243 if (!len)
244 return 0;
245 if (!ret) { /* still data left in the queue */
246 ret = cq_enqueue(ut->cq, buf, len);
247 if (ret < 0)
248 goto fail;
249 }
250 ret = write_nonblock(ut->fd, buf, len, 0);
251 if (ret < 0)
252 goto fail;
253 if (ret != len) {
254 ret = cq_enqueue(ut->cq, buf + ret, len - ret);
255 if (ret < 0)
256 goto fail;
257 }
258 return 1;
259 fail:
260 udp_delete_target(ut, para_strerror(-ret));
261 return ret;
262 }
263
264 static void udp_add_target(struct sender_command_data *scd)
265 {
266 struct udp_target *ut = para_calloc(sizeof(struct udp_target));
267
268 strncpy(ut->host, scd->host, sizeof(ut->host));
269 ut->port = scd->port > 0 ? scd->port : conf.udp_default_port_arg;
270 ut->fd = -1; /* not yet connected */
271 PARA_INFO_LOG("adding to target list (%s#%d)\n", ut->host, ut->port);
272 para_list_add(&ut->node, &targets);
273 ut->fcp.slices_per_group = scd->slices_per_group;
274 ut->fcp.data_slices_per_group = scd->data_slices_per_group;
275 ut->fcp.max_slice_bytes = scd->max_slice_bytes;
276 ut->fcp.send = udp_send_fec;
277 ut->fcp.private_data = ut;
278 vss_add_fec_client(&ut->fcp, &ut->fc);
279 }
280
281 static int udp_com_add(struct sender_command_data *scd)
282 {
283 udp_add_target(scd);
284 return 1;
285 }
286
287 static char *udp_info(void)
288 {
289 struct udp_target *ut;
290 char *ret, *tgts = NULL;
291
292 list_for_each_entry(ut, &targets, node) {
293 bool is_v6 = strchr(ut->host, ':') != NULL;
294 char *tmp = make_message("%s%s%s%s:%d/%u:%u:%u ", tgts ? : "",
295 is_v6 ? "[" : "", ut->host,
296 is_v6 ? "]" : "", ut->port,
297 ut->fcp.max_slice_bytes,
298 ut->fcp.data_slices_per_group,
299 ut->fcp.slices_per_group
300 );
301 free(tgts);
302 tgts = tmp;
303 }
304 ret = make_message(
305 "udp sender:\n"
306 "\tstatus: %s\n"
307 "\tport: udp %d\n"
308 "\ttargets: %s\n",
309 (sender_status == SENDER_ON)? "on" : "off",
310 conf.udp_default_port_arg,
311 tgts? tgts : "(none)"
312 );
313 free(tgts);
314 return ret;
315 }
316
317 static void udp_init_target_list(void)
318 {
319 struct sender_command_data scd;
320 int i;
321
322 INIT_LIST_HEAD(&targets);
323 for (i = 0; i < conf.udp_target_given; i++) {
324 if (parse_fec_url(conf.udp_target_arg[i], &scd) < 0) {
325 PARA_CRIT_LOG("syntax error for udp target option "
326 "#%d, ignoring\n", i);
327 continue;
328 }
329 udp_add_target(&scd);
330 }
331 }
332
333 static char *udp_help(void)
334 {
335 return make_message(
336 "usage: {on|off}\n"
337 "usage: {add|delete} host[:port][/packet_size:k:n]\n"
338 "examples: add 224.0.1.38:1500 (IPv4 multicast)\n"
339 " add 224.0.1.38:1500/1400:14:16\n"
340 " (likewise, using 1400 byte packets, with 14\n"
341 " data slices per 16 slice FEC group)\n"
342 " add 10.10.1.42 (using default port)\n"
343 " add [FF05::42]:1500 (IPv6 multicast)\n"
344 " add [::1] (IPv6 localhost/default port)\n"
345 " delete myhost.net (host with port wildcard)\n"
346 " delete [badc0de::1] (IPv6 with port wildcard)\n"
347 );
348 }
349
350 /**
351 * The init function of para_server's udp sender.
352 *
353 * \param s Pointer to the udp sender struct.
354 *
355 * It initializes all function pointers of \a s and the list of udp targets.
356 */
357 void udp_send_init(struct sender *s)
358 {
359 INIT_LIST_HEAD(&targets);
360 s->info = udp_info;
361 s->help = udp_help;
362 s->send = NULL;
363 s->pre_select = NULL;
364 s->post_select = NULL;
365 s->shutdown_clients = udp_shutdown_targets;
366 s->client_cmds[SENDER_ON] = udp_com_on;
367 s->client_cmds[SENDER_OFF] = udp_com_off;
368 s->client_cmds[SENDER_DENY] = NULL;
369 s->client_cmds[SENDER_ALLOW] = NULL;
370 s->client_cmds[SENDER_ADD] = udp_com_add;
371 s->client_cmds[SENDER_DELETE] = udp_com_delete;
372 sender_status = SENDER_OFF;
373 udp_init_target_list();
374 if (!conf.udp_no_autostart_given)
375 sender_status = SENDER_ON;
376 PARA_DEBUG_LOG("udp sender init complete\n");
377 }