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 #include "chunk_queue.h"
  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         /** The list of queued chunks for this fd. */
  45         struct chunk_queue *cq;
  46 };
  47
  48 static struct list_head targets;
  49 static int sender_status;
  50
  51 static void udp_close_target(struct udp_target *ut)
  52 {
  53         if (ut->fd < 0)
  54                 return;
  55         close(ut->fd);
  56         del_close_on_fork_list(ut->fd);
  57         cq_destroy(ut->cq);
  58         ut->cq = NULL;
  59         ut->fd = -1;
  60 }
  61
  62 static void udp_delete_target(struct udp_target *ut, const char *msg)
  63 {
  64         PARA_NOTICE_LOG("deleting %s:%d (%s) from list\n", TARGET_ADDR(ut),
  65                 ut->port, msg);
  66         udp_close_target(ut);
  67         list_del(&ut->node);
  68         free(ut);
  69 }
  70
  71 /**
  72  * Perform AF-independent multicast sender setup.
  73  *
  74  * \param fd    The connected socket descriptor.
  75  * \param ttl   UDPv4 multicast TTL or UDPv6 multicast number of hops.
  76  *              Use -1 to mean default, 0..255 otherwise.
  77
  78  ** \return Zero if okay, negative on error.
  79  */
  80 static int mcast_sender_setup(struct udp_target *ut, int ttl)
  81 {
  82         struct sockaddr_storage ss;
  83         socklen_t sslen = sizeof(ss);
  84
  85         const int on = 1;
  86
  87         if (getpeername(ut->fd, (struct sockaddr *)&ss, &sslen) < 0)
  88                 goto err;
  89
  90         /* RFC 3493, 5.2: -1 means 'use kernel default' */
  91         if (ttl < 0 || ttl > 255)
  92                 ttl = -1;
  93
  94         switch (ss.ss_family) {
  95         case AF_INET:
  96                 if (!IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr)))
  97                         return 0;
  98                 /*
  99                  * Enable receiving multicast messages generated on the local host
 100                  * At least on Linux, this is enabled by default.
 101                  */
 102                 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_LOOP, &on, sizeof(on)) < 0)
 103                         break;
 104
 105                 /* Default: use local subnet (do not flood out into the WAN) */
 106                 if (ttl == -1)
 107                         ttl = 1;
 108                 if (setsockopt(ut->fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
 109                         break;
 110                 return 0;
 111         case AF_INET6:
 112                 if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)&ss)->sin6_addr))
 113                         return 0;
 114                 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &on, sizeof(on)) < 0)
 115                         break;
 116                 if (setsockopt(ut->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
 117                         break;
 118                 return 0;
 119         default:
 120                 PARA_ERROR_LOG("address family %d not supported", ss.ss_family);
 121                 return -E_ADDRESS_LOOKUP;
 122         }
 123 err:
 124         return -ERRNO_TO_PARA_ERROR(errno);
 125 }
 126
 127 /** The maximal size of the per-target chunk queue. */
 128 #define UDP_CQ_BYTES 40000
 129
 130 static int udp_init_session(struct udp_target *ut)
 131 {
 132         int ret;
 133
 134         if (ut->fd >= 0) /* nothing to do */
 135                 return 0;
 136
 137         ret = makesock(AF_UNSPEC, IPPROTO_UDP, 0, TARGET_ADDR(ut), ut->port);
 138         if (ret < 0)
 139                 return ret;
 140         ut->fd = ret;
 141
 142         ret = mcast_sender_setup(ut, conf.udp_ttl_arg);
 143         if (ret < 0) {
 144                 close(ut->fd);
 145                 return ret;
 146         }
 147
 148         ret = mark_fd_nonblocking(ut->fd);
 149         if (ret < 0) {
 150                 close(ut->fd);
 151                 return ret;
 152         }
 153         add_close_on_fork_list(ut->fd);
 154         ut->cq = cq_new(UDP_CQ_BYTES);
 155         PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
 156         return 1;
 157 }
 158
 159 static void udp_send_buf(char *buf, size_t len)
 160 {
 161         struct udp_target *ut, *tmp;
 162         int ret;
 163
 164         list_for_each_entry_safe(ut, tmp, &targets, node) {
 165                 ret = udp_init_session(ut);
 166                 if (ret < 0) {
 167                         udp_delete_target(ut, para_strerror(-ret));
 168                         continue;
 169                 }
 170                 ret = send_queued_chunks(ut->fd, ut->cq, 0);
 171                 if (ret < 0) {
 172                         udp_delete_target(ut, para_strerror(-ret));
 173                         continue;
 174                 }
 175                 if (!len)
 176                         continue;
 177                 if (!ret) { /* still data left in the queue */
 178                         ret = cq_enqueue(ut->cq, buf, len);
 179                         if (ret < 0) {
 180                                 udp_delete_target(ut, para_strerror(-ret));
 181                                 continue;
 182                         }
 183                 }
 184                 ret = write_nonblock(ut->fd, buf, len, 0);
 185                 if (ret < 0) {
 186                         udp_delete_target(ut, para_strerror(-ret));
 187                         continue;
 188                 }
 189                 if (ret != len) {
 190                         ret = cq_enqueue(ut->cq, buf + ret, len - ret);
 191                         if (ret < 0) {
 192                                 udp_delete_target(ut, para_strerror(-ret));
 193                                 continue;
 194                         }
 195                 }
 196         }
 197 }
 198
 199 static void udp_shutdown_targets(void)
 200 {
 201         char buf[UDP_AUDIO_HEADER_LEN];
 202         struct udp_target *ut, *tmp;
 203         struct udp_audio_header uah = {
 204                 .stream_type = UDP_UNKNOWN_STREAM,
 205                 .packet_type = UDP_EOF_PACKET,
 206         };
 207
 208         write_udp_audio_header(buf, &uah);
 209         list_for_each_entry_safe(ut, tmp, &targets, node) {
 210                 if (ut->fd < 0)
 211                         continue;
 212                 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
 213                 udp_close_target(ut);
 214         }
 215 }
 216
 217 static int need_extra_header(long unsigned current_chunk)
 218 {
 219         static struct timeval last_header;
 220         struct timeval diff;
 221
 222         if (!current_chunk)
 223                 return 0;
 224         tv_diff(now, &last_header, &diff);
 225         if (tv2ms(&diff) < conf.udp_header_interval_arg)
 226                 return 0;
 227         last_header = *now;
 228         return 1;
 229 }
 230
 231 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
 232                 const char *buf, size_t len, const char *header_buf,
 233                 size_t header_len)
 234 {
 235         char *sendbuf;
 236         size_t sendbuf_len;
 237         struct timeval *chunk_tv;
 238         struct udp_audio_header uah;
 239
 240 //      PARA_NOTICE_LOG("len: %zd, header_len: %zd\n", len, header_len);
 241         if (sender_status != SENDER_ON)
 242                 return;
 243
 244         /* we might not yet know the chunk time */
 245         chunk_tv = vss_chunk_time();
 246         if (!chunk_tv)
 247                 return;
 248         if (list_empty(&targets))
 249                 return;
 250         uah.stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
 251         uah.header_len = need_extra_header(current_chunk)? header_len : 0;
 252         if (!current_chunk)
 253                 uah.packet_type = UDP_BOF_PACKET;
 254         else if (uah.header_len)
 255                 uah.packet_type = UDP_HEADER_PACKET;
 256         else
 257                 uah.packet_type = UDP_DATA_PACKET;
 258         uah.payload_len = uah.header_len + len;
 259         sendbuf_len = UDP_AUDIO_HEADER_LEN + uah.payload_len;
 260         sendbuf = para_malloc(sendbuf_len);
 261         write_udp_audio_header(sendbuf, &uah);
 262         if (uah.header_len)
 263                 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
 264                         uah.header_len);
 265         memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + uah.header_len, buf, len);
 266         udp_send_buf(sendbuf, sendbuf_len);
 267         free(sendbuf);
 268 }
 269
 270 static int udp_com_on(__a_unused struct sender_command_data *scd)
 271 {
 272         sender_status = SENDER_ON;
 273         return 1;
 274 }
 275
 276 static int udp_com_off(__a_unused struct sender_command_data *scd)
 277 {
 278         udp_shutdown_targets();
 279         sender_status = SENDER_OFF;
 280         return 1;
 281 }
 282
 283 static int udp_com_delete(struct sender_command_data *scd)
 284 {
 285         char *a = para_strdup(inet_ntoa(scd->addr));
 286         struct udp_target *ut, *tmp;
 287         list_for_each_entry_safe(ut, tmp, &targets, node) {
 288                 if (scd->port != ut->port)
 289                         continue;
 290                 if (strcmp(TARGET_ADDR(ut), a))
 291                         continue;
 292                 udp_delete_target(ut, "com_delete");
 293         }
 294         return 1;
 295 }
 296
 297 static void udp_add_target(int port, struct in_addr *addr)
 298 {
 299         struct udp_target *ut = para_calloc(sizeof(struct udp_target));
 300         ut->port = port;
 301         ut->addr = *addr;
 302         ut->fd = -1; /* not yet connected */
 303         PARA_INFO_LOG("adding to target list (%s:%d)\n",
 304                 TARGET_ADDR(ut), ut->port);
 305         para_list_add(&ut->node, &targets);
 306 }
 307
 308 static int udp_com_add(struct sender_command_data *scd)
 309 {
 310         int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
 311         udp_add_target(port, &scd->addr);
 312         return 1;
 313 }
 314
 315 static char *udp_info(void)
 316 {
 317         struct udp_target *ut;
 318         char *ret, *tgts = NULL;
 319
 320         list_for_each_entry(ut, &targets, node) {
 321                 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
 322                         TARGET_ADDR(ut), ut->port);
 323                 free(tgts);
 324                 tgts = tmp;
 325         }
 326         ret = make_message(
 327                 "udp sender:\n"
 328                 "\tstatus: %s\n"
 329                 "\tport: udp %d\n"
 330                 "\ttargets: %s\n",
 331                 (sender_status == SENDER_ON)? "on" : "off",
 332                 conf.udp_default_port_arg,
 333                 tgts? tgts : "(none)"
 334         );
 335         free(tgts);
 336         return ret;
 337 }
 338
 339 static void udp_init_target_list(void)
 340 {
 341         int i;
 342
 343         INIT_LIST_HEAD(&targets);
 344         for (i = 0; i < conf.udp_target_given; i++) {
 345                 char *arg = para_strdup(conf.udp_target_arg[i]);
 346                 char *p = strchr(arg, ':');
 347                 int port;
 348                 struct in_addr addr;
 349
 350                 if (!p)
 351                         goto err;
 352                 *p = '\0';
 353                 if (!inet_pton(AF_INET, arg, &addr))
 354                         goto err;
 355                 port = atoi(++p);
 356                 if (port < 0 || port > 65535)
 357                         port = conf.udp_default_port_arg;
 358                 udp_add_target(port, &addr);
 359                 goto success;
 360 err:
 361                 PARA_CRIT_LOG("syntax error for udp target option "
 362                         "#%d, ignoring\n", i);
 363 success:
 364                 free(arg);
 365                 continue;
 366         }
 367 }
 368
 369 static char *udp_help(void)
 370 {
 371         return make_message(
 372                 "usage: {on|off}\n"
 373                 "usage: {add|delete} IP port\n"
 374                 "example: add 224.0.1.38 8000 (multicast streaming)\n"
 375         );
 376 }
 377
 378 /**
 379  * The init function of para_server's udp sender.
 380  *
 381  * \param s Pointer to the http sender struct.
 382  *
 383  * It initializes all function pointers of \a s and the list of udp targets.
 384  */
 385 void udp_send_init(struct sender *s)
 386 {
 387         INIT_LIST_HEAD(&targets);
 388         s->info = udp_info;
 389         s->help = udp_help;
 390         s->send = udp_send;
 391         s->pre_select = NULL;
 392         s->post_select = NULL;
 393         s->shutdown_clients = udp_shutdown_targets;
 394         s->client_cmds[SENDER_ON] = udp_com_on;
 395         s->client_cmds[SENDER_OFF] = udp_com_off;
 396         s->client_cmds[SENDER_DENY] = NULL;
 397         s->client_cmds[SENDER_ALLOW] = NULL;
 398         s->client_cmds[SENDER_ADD] = udp_com_add;
 399         s->client_cmds[SENDER_DELETE] = udp_com_delete;
 400         sender_status = SENDER_OFF;
 401         udp_init_target_list();
 402         if (!conf.udp_no_autostart_given)
 403                 sender_status = SENDER_ON;
 404         PARA_DEBUG_LOG("udp sender init complete\n");
 405 }