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