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 /** The maximal size of the per-target chunk queue. */
  72 #define UDP_CQ_BYTES 40000
  73
  74 static int udp_init_session(struct udp_target *ut)
  75 {
  76         int ret;
  77
  78         if (ut->fd >= 0) /* nothing to do */
  79                 return 0;
  80         ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port,
  81                 conf.udp_ttl_arg);
  82         if (ret < 0)
  83                 return ret;
  84         ut->fd = ret;
  85         ret = mark_fd_nonblocking(ut->fd);
  86         if (ret < 0) {
  87                 close(ut->fd);
  88                 return ret;
  89         }
  90         add_close_on_fork_list(ut->fd);
  91         ut->cq = cq_new(UDP_CQ_BYTES);
  92         PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
  93         return 1;
  94 }
  95
  96 static void udp_send_buf(char *buf, size_t len)
  97 {
  98         struct udp_target *ut, *tmp;
  99         int ret;
 100
 101         list_for_each_entry_safe(ut, tmp, &targets, node) {
 102                 ret = udp_init_session(ut);
 103                 if (ret < 0) {
 104                         udp_delete_target(ut, para_strerror(-ret));
 105                         continue;
 106                 }
 107                 ret = send_queued_chunks(ut->fd, ut->cq, 0);
 108                 if (ret < 0) {
 109                         udp_delete_target(ut, para_strerror(-ret));
 110                         continue;
 111                 }
 112                 if (!len)
 113                         continue;
 114                 if (!ret) { /* still data left in the queue */
 115                         ret = cq_enqueue(ut->cq, buf, len);
 116                         if (ret < 0) {
 117                                 udp_delete_target(ut, para_strerror(-ret));
 118                                 continue;
 119                         }
 120                 }
 121                 ret = write_nonblock(ut->fd, buf, len, 0);
 122                 if (ret < 0) {
 123                         udp_delete_target(ut, para_strerror(-ret));
 124                         continue;
 125                 }
 126                 if (ret != len) {
 127                         ret = cq_enqueue(ut->cq, buf + ret, len - ret);
 128                         if (ret < 0) {
 129                                 udp_delete_target(ut, para_strerror(-ret));
 130                                 continue;
 131                         }
 132                 }
 133         }
 134 }
 135
 136 static void udp_shutdown_targets(void)
 137 {
 138         char buf[UDP_AUDIO_HEADER_LEN];
 139         struct udp_target *ut, *tmp;
 140         struct udp_audio_header uah = {
 141                 .stream_type = UDP_UNKNOWN_STREAM,
 142                 .packet_type = UDP_EOF_PACKET,
 143         };
 144
 145         write_udp_audio_header(buf, &uah);
 146         list_for_each_entry_safe(ut, tmp, &targets, node) {
 147                 if (ut->fd < 0)
 148                         continue;
 149                 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
 150                 udp_close_target(ut);
 151         }
 152 }
 153
 154 static int need_extra_header(long unsigned current_chunk)
 155 {
 156         static struct timeval last_header;
 157         struct timeval diff;
 158
 159         if (!current_chunk)
 160                 return 0;
 161         tv_diff(now, &last_header, &diff);
 162         if (tv2ms(&diff) < conf.udp_header_interval_arg)
 163                 return 0;
 164         last_header = *now;
 165         return 1;
 166 }
 167
 168 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
 169                 const char *buf, size_t len, const char *header_buf,
 170                 size_t header_len)
 171 {
 172         char *sendbuf;
 173         size_t sendbuf_len;
 174         struct timeval *chunk_tv;
 175         struct udp_audio_header uah;
 176
 177 //      PARA_NOTICE_LOG("len: %zd, header_len: %zd\n", len, header_len);
 178         if (sender_status != SENDER_ON)
 179                 return;
 180
 181         /* we might not yet know the chunk time */
 182         chunk_tv = vss_chunk_time();
 183         if (!chunk_tv)
 184                 return;
 185         if (list_empty(&targets))
 186                 return;
 187         uah.stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
 188         uah.header_len = need_extra_header(current_chunk)? header_len : 0;
 189         if (!current_chunk)
 190                 uah.packet_type = UDP_BOF_PACKET;
 191         else if (uah.header_len)
 192                 uah.packet_type = UDP_HEADER_PACKET;
 193         else
 194                 uah.packet_type = UDP_DATA_PACKET;
 195         uah.payload_len = uah.header_len + len;
 196         sendbuf_len = UDP_AUDIO_HEADER_LEN + uah.payload_len;
 197         sendbuf = para_malloc(sendbuf_len);
 198         write_udp_audio_header(sendbuf, &uah);
 199         if (uah.header_len)
 200                 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
 201                         uah.header_len);
 202         memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + uah.header_len, buf, len);
 203         udp_send_buf(sendbuf, sendbuf_len);
 204         free(sendbuf);
 205 }
 206
 207 static int udp_com_on(__a_unused struct sender_command_data *scd)
 208 {
 209         sender_status = SENDER_ON;
 210         return 1;
 211 }
 212
 213 static int udp_com_off(__a_unused struct sender_command_data *scd)
 214 {
 215         udp_shutdown_targets();
 216         sender_status = SENDER_OFF;
 217         return 1;
 218 }
 219
 220 static int udp_com_delete(struct sender_command_data *scd)
 221 {
 222         char *a = para_strdup(inet_ntoa(scd->addr));
 223         struct udp_target *ut, *tmp;
 224         list_for_each_entry_safe(ut, tmp, &targets, node) {
 225                 if (scd->port != ut->port)
 226                         continue;
 227                 if (strcmp(TARGET_ADDR(ut), a))
 228                         continue;
 229                 udp_delete_target(ut, "com_delete");
 230         }
 231         return 1;
 232 }
 233
 234 static void udp_add_target(int port, struct in_addr *addr)
 235 {
 236         struct udp_target *ut = para_calloc(sizeof(struct udp_target));
 237         ut->port = port;
 238         ut->addr = *addr;
 239         ut->fd = -1; /* not yet connected */
 240         PARA_INFO_LOG("adding to target list (%s:%d)\n",
 241                 TARGET_ADDR(ut), ut->port);
 242         para_list_add(&ut->node, &targets);
 243 }
 244
 245 static int udp_com_add(struct sender_command_data *scd)
 246 {
 247         int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
 248         udp_add_target(port, &scd->addr);
 249         return 1;
 250 }
 251
 252 static char *udp_info(void)
 253 {
 254         struct udp_target *ut;
 255         char *ret, *tgts = NULL;
 256
 257         list_for_each_entry(ut, &targets, node) {
 258                 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
 259                         TARGET_ADDR(ut), ut->port);
 260                 free(tgts);
 261                 tgts = tmp;
 262         }
 263         ret = make_message(
 264                 "udp sender:\n"
 265                 "\tstatus: %s\n"
 266                 "\tport: udp %d\n"
 267                 "\ttargets: %s\n",
 268                 (sender_status == SENDER_ON)? "on" : "off",
 269                 conf.udp_default_port_arg,
 270                 tgts? tgts : "(none)"
 271         );
 272         free(tgts);
 273         return ret;
 274 }
 275
 276 static void udp_init_target_list(void)
 277 {
 278         int i;
 279
 280         INIT_LIST_HEAD(&targets);
 281         for (i = 0; i < conf.udp_target_given; i++) {
 282                 char *arg = para_strdup(conf.udp_target_arg[i]);
 283                 char *p = strchr(arg, ':');
 284                 int port;
 285                 struct in_addr addr;
 286
 287                 if (!p)
 288                         goto err;
 289                 *p = '\0';
 290                 if (!inet_pton(AF_INET, arg, &addr))
 291                         goto err;
 292                 port = atoi(++p);
 293                 if (port < 0 || port > 65535)
 294                         port = conf.udp_default_port_arg;
 295                 udp_add_target(port, &addr);
 296                 goto success;
 297 err:
 298                 PARA_CRIT_LOG("syntax error for udp target option "
 299                         "#%d, ignoring\n", i);
 300 success:
 301                 free(arg);
 302                 continue;
 303         }
 304 }
 305
 306 static char *udp_help(void)
 307 {
 308         return make_message(
 309                 "usage: {on|off}\n"
 310                 "usage: {add|delete} IP port\n"
 311                 "example: add 224.0.1.38 8000 (multicast streaming)\n"
 312         );
 313 }
 314
 315 /**
 316  * The init function of para_server's udp sender.
 317  *
 318  * \param s Pointer to the http sender struct.
 319  *
 320  * It initializes all function pointers of \a s and the list of udp targets.
 321  */
 322 void udp_send_init(struct sender *s)
 323 {
 324         INIT_LIST_HEAD(&targets);
 325         s->info = udp_info;
 326         s->help = udp_help;
 327         s->send = udp_send;
 328         s->pre_select = NULL;
 329         s->post_select = NULL;
 330         s->shutdown_clients = udp_shutdown_targets;
 331         s->client_cmds[SENDER_ON] = udp_com_on;
 332         s->client_cmds[SENDER_OFF] = udp_com_off;
 333         s->client_cmds[SENDER_DENY] = NULL;
 334         s->client_cmds[SENDER_ALLOW] = NULL;
 335         s->client_cmds[SENDER_ADD] = udp_com_add;
 336         s->client_cmds[SENDER_DELETE] = udp_com_delete;
 337         sender_status = SENDER_OFF;
 338         udp_init_target_list();
 339         if (!conf.udp_no_autostart_given)
 340                 sender_status = SENDER_ON;
 341         PARA_DEBUG_LOG("udp sender init complete\n");
 342 }