Merge branch 'maint'
[paraslash.git] / udp_send.c
1 /*
2 * Copyright (C) 2005-2010 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 <regex.h>
11 #include <sys/time.h>
12 #include <dirent.h>
13 #include <sys/socket.h>
14 #include <net/if.h>
15 #include <osl.h>
16
17 #include "server.cmdline.h"
18 #include "para.h"
19 #include "error.h"
20 #include "string.h"
21 #include "afh.h"
22 #include "afs.h"
23 #include "server.h"
24 #include "vss.h"
25 #include "list.h"
26 #include "send.h"
27 #include "portable_io.h"
28 #include "net.h"
29 #include "fd.h"
30 #include "sched.h"
31 #include "close_on_fork.h"
32 #include "chunk_queue.h"
33
34 /** Describes one entry in the list of targets for the udp sender. */
35 struct udp_target {
36 /** The position of this target in the list of targets. */
37 struct list_head node;
38 /** The hostname (DNS name or IPv4/v6 address string). */
39 char host[MAX_HOSTLEN];
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 /** The opaque structure returned by vss_add_fec_client(). */
47 struct fec_client *fc;
48 /** The FEC parameters for this target. */
49 struct fec_client_parms fcp;
50 };
51
52 static struct list_head targets;
53 static int sender_status;
54
55 static void udp_close_target(struct udp_target *ut)
56 {
57 if (ut->fd < 0)
58 return;
59 close(ut->fd);
60 del_close_on_fork_list(ut->fd);
61 cq_destroy(ut->cq);
62 ut->cq = NULL;
63 ut->fd = -1;
64 }
65
66 static void udp_delete_target(struct udp_target *ut, const char *msg)
67 {
68 PARA_NOTICE_LOG("deleting %s#%d (%s) from list\n", ut->host,
69 ut->port, msg);
70 udp_close_target(ut);
71 vss_del_fec_client(ut->fc);
72 list_del(&ut->node);
73 free(ut);
74 }
75
76 /**
77 * Perform AF-independent multicast sender setup.
78 *
79 * \param fd The connected socket descriptor.
80 * \param ttl UDPv4 multicast TTL or UDPv6 multicast number of hops.
81 * Use -1 to mean default, 0..255 otherwise.
82 * \param iface The outgoing multicast interface, or NULL for the default.
83 *
84 * \return Zero if okay, negative on error.
85 */
86 static int mcast_sender_setup(struct udp_target *ut, int ttl, char *iface)
87 {
88 struct sockaddr_storage ss;
89 socklen_t sslen = sizeof(ss);
90
91 const int on = 1;
92 int id = iface == NULL ? 0 : if_nametoindex(iface);
93
94 if (getpeername(ut->fd, (struct sockaddr *)&ss, &sslen) < 0)
95 goto err;
96
97 if (iface != NULL && id == 0)
98 PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
99
100 /* RFC 3493, 5.2: -1 means 'use kernel default' */
101 if (ttl < 0 || ttl > 255)
102 ttl = -1;
103
104 switch (ss.ss_family) {
105 case AF_INET:
106 if (!IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr)))
107 return 0;
108 if (id != 0) {
109 #ifdef HAVE_IP_MREQN
110 struct ip_mreqn mn;
111
112 memset(&mn, 0, sizeof(mn));
113 mn.imr_ifindex = id;
114 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_IF, &mn, sizeof(mn)) < 0)
115 goto err;
116 #else
117 PARA_ERROR_LOG("No support for setting outgoing IPv4 mcast interface.");
118 #endif
119 }
120 /*
121 * Enable receiving multicast messages generated on the local host
122 * At least on Linux, this is enabled by default.
123 */
124 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_LOOP, &on, sizeof(on)) < 0)
125 break;
126
127 /* Default: use local subnet (do not flood out into the WAN) */
128 if (ttl == -1)
129 ttl = 1;
130 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
131 break;
132 return 0;
133 case AF_INET6:
134 if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr))
135 return 0;
136 if (id != 0 &&
137 setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &id, sizeof(id)) < 0)
138 break;
139 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &on, sizeof(on)) < 0)
140 break;
141 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
142 break;
143 return 0;
144 default:
145 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
146 return -E_ADDRESS_LOOKUP;
147 }
148 err:
149 return -ERRNO_TO_PARA_ERROR(errno);
150 }
151
152 /** The maximal size of the per-target chunk queue. */
153 #define UDP_CQ_BYTES 40000
154
155 static int udp_init_session(struct udp_target *ut)
156 {
157 int ret;
158 char *iface = NULL;
159
160 if (ut->fd >= 0) /* nothing to do */
161 return 0;
162
163 ret = para_connect_simple(IPPROTO_UDP, ut->host, ut->port);
164 if (ret < 0)
165 return ret;
166 ut->fd = ret;
167
168 if (conf.udp_mcast_iface_given)
169 iface = conf.udp_mcast_iface_arg;
170
171 ret = mcast_sender_setup(ut, conf.udp_ttl_arg, iface);
172 if (ret < 0) {
173 close(ut->fd);
174 return ret;
175 }
176
177 ret = mark_fd_nonblocking(ut->fd);
178 if (ret < 0) {
179 close(ut->fd);
180 return ret;
181 }
182 add_close_on_fork_list(ut->fd);
183 ut->cq = cq_new(UDP_CQ_BYTES);
184 PARA_NOTICE_LOG("sending to udp %s#%d\n", ut->host, ut->port);
185 return 1;
186 }
187
188 static void udp_shutdown_targets(void)
189 {
190 struct udp_target *ut, *tmp;
191 const char *buf = NULL;
192 size_t len = 0; /* STFU, gcc */
193
194 list_for_each_entry_safe(ut, tmp, &targets, node) {
195 if (ut->fd < 0)
196 continue;
197 if (!buf)
198 len = vss_get_fec_eof_packet(&buf);
199 write(ut->fd, buf, len);
200 udp_close_target(ut);
201 }
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 struct udp_target *ut, *tmp;
220
221 list_for_each_entry_safe(ut, tmp, &targets, node) {
222 /* Unspecified port means wildcard port match */
223 if (scd->port > 0 && scd->port != ut->port)
224 continue;
225 if (strcmp(ut->host, scd->host))
226 continue;
227 udp_delete_target(ut, "com_delete");
228 }
229 return 1;
230 }
231
232 static int udp_send_fec(char *buf, size_t len, void *private_data)
233 {
234 struct udp_target *ut = private_data;
235 int ret;
236
237 if (sender_status == SENDER_OFF)
238 return 0;
239 ret = udp_init_session(ut);
240 if (ret < 0)
241 goto fail;
242 ret = send_queued_chunks(ut->fd, ut->cq, 0);
243 if (ret < 0)
244 goto fail;
245 if (!len)
246 return 0;
247 if (!ret) { /* still data left in the queue */
248 ret = cq_enqueue(ut->cq, buf, len);
249 if (ret < 0)
250 goto fail;
251 }
252 ret = write_nonblock(ut->fd, buf, len, 0);
253 if (ret < 0)
254 goto fail;
255 if (ret != len) {
256 ret = cq_enqueue(ut->cq, buf + ret, len - ret);
257 if (ret < 0)
258 goto fail;
259 }
260 return 1;
261 fail:
262 udp_delete_target(ut, para_strerror(-ret));
263 return ret;
264 }
265
266 static void udp_add_target(struct sender_command_data *scd)
267 {
268 struct udp_target *ut = para_calloc(sizeof(struct udp_target));
269
270 strncpy(ut->host, scd->host, sizeof(ut->host));
271 ut->port = scd->port > 0 ? scd->port : conf.udp_default_port_arg;
272 ut->fd = -1; /* not yet connected */
273 PARA_INFO_LOG("adding to target list (%s#%d)\n", ut->host, ut->port);
274 para_list_add(&ut->node, &targets);
275 ut->fcp.slices_per_group = scd->slices_per_group;
276 ut->fcp.data_slices_per_group = scd->data_slices_per_group;
277 ut->fcp.max_slice_bytes = scd->max_slice_bytes;
278 ut->fcp.send = udp_send_fec;
279 ut->fcp.private_data = ut;
280 vss_add_fec_client(&ut->fcp, &ut->fc);
281 }
282
283 static int udp_com_add(struct sender_command_data *scd)
284 {
285 udp_add_target(scd);
286 return 1;
287 }
288
289 static char *udp_info(void)
290 {
291 struct udp_target *ut;
292 char *ret, *tgts = NULL;
293
294 list_for_each_entry(ut, &targets, node) {
295 bool is_v6 = strchr(ut->host, ':') != NULL;
296 char *tmp = make_message("%s%s%s%s:%d/%u:%u:%u ", tgts ? : "",
297 is_v6 ? "[" : "", ut->host,
298 is_v6 ? "]" : "", ut->port,
299 ut->fcp.max_slice_bytes,
300 ut->fcp.data_slices_per_group,
301 ut->fcp.slices_per_group
302 );
303 free(tgts);
304 tgts = tmp;
305 }
306 ret = make_message(
307 "udp sender:\n"
308 "\tstatus: %s\n"
309 "\tport: %s\n"
310 "\ttargets: %s\n",
311 (sender_status == SENDER_ON)? "on" : "off",
312 stringify_port(conf.udp_default_port_arg, "udp"),
313 tgts? tgts : "(none)"
314 );
315 free(tgts);
316 return ret;
317 }
318
319 static void udp_init_target_list(void)
320 {
321 struct sender_command_data scd;
322 int i;
323
324 INIT_LIST_HEAD(&targets);
325 for (i = 0; i < conf.udp_target_given; i++) {
326 if (parse_fec_url(conf.udp_target_arg[i], &scd) < 0) {
327 PARA_CRIT_LOG("syntax error for udp target option "
328 "#%d, ignoring\n", i);
329 continue;
330 }
331 udp_add_target(&scd);
332 }
333 }
334
335 static char *udp_help(void)
336 {
337 return make_message(
338 "usage: {on|off}\n"
339 "usage: {add|delete} host[:port][/packet_size:k:n]\n"
340 "examples: add 224.0.1.38:1500 (IPv4 multicast)\n"
341 " add 224.0.1.38:1500/1400:14:16\n"
342 " (likewise, using 1400 byte packets, with 14\n"
343 " data slices per 16 slice FEC group)\n"
344 " add 10.10.1.42 (using default port)\n"
345 " add [FF05::42]:1500 (IPv6 multicast)\n"
346 " add [::1] (IPv6 localhost/default port)\n"
347 " delete myhost.net (host with port wildcard)\n"
348 " delete [badc0de::1] (IPv6 with port wildcard)\n"
349 );
350 }
351
352 /**
353 * The init function of para_server's udp sender.
354 *
355 * \param s Pointer to the udp sender struct.
356 *
357 * It initializes all function pointers of \a s and the list of udp targets.
358 */
359 void udp_send_init(struct sender *s)
360 {
361 INIT_LIST_HEAD(&targets);
362 s->info = udp_info;
363 s->help = udp_help;
364 s->send = NULL;
365 s->pre_select = NULL;
366 s->post_select = NULL;
367 s->shutdown_clients = udp_shutdown_targets;
368 s->client_cmds[SENDER_ON] = udp_com_on;
369 s->client_cmds[SENDER_OFF] = udp_com_off;
370 s->client_cmds[SENDER_DENY] = NULL;
371 s->client_cmds[SENDER_ALLOW] = NULL;
372 s->client_cmds[SENDER_ADD] = udp_com_add;
373 s->client_cmds[SENDER_DELETE] = udp_com_delete;
374 sender_status = SENDER_OFF;
375 udp_init_target_list();
376 if (!conf.udp_no_autostart_given)
377 sender_status = SENDER_ON;
378 PARA_DEBUG_LOG("udp sender init complete\n");
379 }