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 static void udp_send_buf(char *buf, size_t len)
  72 {
  73         struct udp_target *ut, *tmp;
  74         int ret;
  75
  76         list_for_each_entry_safe(ut, tmp, &targets, node) {
  77                 if (ut->fd < 0)
  78                         continue;
  79                 ret = write_nonblock(ut->fd, buf, len, len);
  80                 if (ret < 0) /* TODO: Use chunk queueing */
  81                         return udp_delete_target(ut, "send error");
  82                 if (ret != len)
  83                         PARA_WARNING_LOG("short write %zu/%zu\n", ret, len);
  84         }
  85 }
  86
  87 #define UDP_CQ_BYTES 40000
  88
  89 static int udp_init_session(struct udp_target *ut)
  90 {
  91         int ret;
  92
  93         if (ut->fd >= 0) /* nothing to do */
  94                 return 0;
  95         PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
  96         ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port,
  97                 conf.udp_ttl_arg);
  98         if (ret < 0)
  99                 return ret;
 100         ut->fd = ret;
 101         ret = mark_fd_nonblocking(ut->fd);
 102         if (ret < 0) {
 103                 close(ut->fd);
 104                 return ret;
 105         }
 106         add_close_on_fork_list(ut->fd);
 107         ut->cq = cq_new(UDP_CQ_BYTES);
 108         return 1;
 109 }
 110
 111 static void udp_shutdown_targets(void)
 112 {
 113         char buf[UDP_AUDIO_HEADER_LEN];
 114         struct udp_target *ut, *tmp;
 115
 116         udp_write_packet_type(buf, UDP_EOF_PACKET);
 117         udp_write_magic(buf);
 118         list_for_each_entry_safe(ut, tmp, &targets, node) {
 119                 if (ut->fd < 0)
 120                         continue;
 121                 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
 122                 udp_close_target(ut);
 123         }
 124 }
 125
 126 static int need_extra_header(long unsigned current_chunk)
 127 {
 128         static struct timeval last_header;
 129         struct timeval diff;
 130
 131         if (!current_chunk)
 132                 return 0;
 133         tv_diff(now, &last_header, &diff);
 134         if (tv2ms(&diff) < conf.udp_header_interval_arg)
 135                 return 0;
 136         last_header = *now;
 137         return 1;
 138 }
 139
 140 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
 141                 const char *buf, size_t len, const char *header_buf,
 142                 size_t header_len)
 143 {
 144         struct udp_target *ut, *tmp;
 145         size_t sendbuf_len;
 146         uint8_t packet_type = UDP_DATA_PACKET;
 147         int ret;
 148         char *sendbuf;
 149         struct timeval *chunk_tv;
 150         uint8_t stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
 151
 152 //      PARA_NOTICE_LOG("header_len: %zd, header_buf: %p\n", header_len,
 153 //              header_buf);
 154         if (sender_status != SENDER_ON)
 155                 return;
 156
 157         /* we might not yet know the chunk time */
 158         chunk_tv = vss_chunk_time();
 159         if (!chunk_tv)
 160                 return;
 161         if (list_empty(&targets))
 162                 return;
 163         list_for_each_entry_safe(ut, tmp, &targets, node) {
 164                 ret = udp_init_session(ut);
 165                 if (ret < 0)
 166                         udp_delete_target(ut, para_strerror(-ret));
 167         }
 168         if (!need_extra_header(current_chunk))
 169                 header_len = 0;
 170         if (!current_chunk)
 171                 packet_type = UDP_BOF_PACKET;
 172         else if (header_len)
 173                 packet_type = UDP_HEADER_PACKET;
 174         sendbuf_len = UDP_AUDIO_HEADER_LEN + header_len + len;
 175         sendbuf = para_malloc(sendbuf_len);
 176         udp_write_magic(sendbuf);
 177         udp_write_stream_type(sendbuf, stream_type);
 178         udp_write_packet_type(sendbuf, packet_type);
 179         udp_write_header_len(sendbuf, header_len);
 180         if (header_len)
 181                 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
 182                         header_len);
 183         memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + header_len, buf, len);
 184         udp_send_buf(sendbuf, sendbuf_len);
 185         free(sendbuf);
 186 }
 187
 188 static int udp_com_on(__a_unused struct sender_command_data *scd)
 189 {
 190         sender_status = SENDER_ON;
 191         return 1;
 192 }
 193
 194 static int udp_com_off(__a_unused struct sender_command_data *scd)
 195 {
 196         udp_shutdown_targets();
 197         sender_status = SENDER_OFF;
 198         return 1;
 199 }
 200
 201 static int udp_com_delete(struct sender_command_data *scd)
 202 {
 203         char *a = para_strdup(inet_ntoa(scd->addr));
 204         struct udp_target *ut, *tmp;
 205         list_for_each_entry_safe(ut, tmp, &targets, node) {
 206                 if (scd->port != ut->port)
 207                         continue;
 208                 if (strcmp(TARGET_ADDR(ut), a))
 209                         continue;
 210                 udp_delete_target(ut, "com_delete");
 211         }
 212         return 1;
 213 }
 214
 215 static void udp_add_target(int port, struct in_addr *addr)
 216 {
 217         struct udp_target *ut = para_calloc(sizeof(struct udp_target));
 218         ut->port = port;
 219         ut->addr = *addr;
 220         ut->fd = -1; /* not yet connected */
 221         PARA_INFO_LOG("adding to target list (%s:%d)\n",
 222                 TARGET_ADDR(ut), ut->port);
 223         para_list_add(&ut->node, &targets);
 224 }
 225
 226 static int udp_com_add(struct sender_command_data *scd)
 227 {
 228         int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
 229         udp_add_target(port, &scd->addr);
 230         return 1;
 231 }
 232
 233 static char *udp_info(void)
 234 {
 235         struct udp_target *ut;
 236         char *ret, *tgts = NULL;
 237
 238         list_for_each_entry(ut, &targets, node) {
 239                 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
 240                         TARGET_ADDR(ut), ut->port);
 241                 free(tgts);
 242                 tgts = tmp;
 243         }
 244         ret = make_message(
 245                 "udp sender:\n"
 246                 "\tstatus: %s\n"
 247                 "\tport: udp %d\n"
 248                 "\ttargets: %s\n",
 249                 (sender_status == SENDER_ON)? "on" : "off",
 250                 conf.udp_default_port_arg,
 251                 tgts? tgts : "(none)"
 252         );
 253         free(tgts);
 254         return ret;
 255 }
 256
 257 static void udp_init_target_list(void)
 258 {
 259         int i;
 260
 261         INIT_LIST_HEAD(&targets);
 262         for (i = 0; i < conf.udp_target_given; i++) {
 263                 char *arg = para_strdup(conf.udp_target_arg[i]);
 264                 char *p = strchr(arg, ':');
 265                 int port;
 266                 struct in_addr addr;
 267
 268                 if (!p)
 269                         goto err;
 270                 *p = '\0';
 271                 if (!inet_pton(AF_INET, arg, &addr))
 272                         goto err;
 273                 port = atoi(++p);
 274                 if (port < 0 || port > 65535)
 275                         port = conf.udp_default_port_arg;
 276                 udp_add_target(port, &addr);
 277                 goto success;
 278 err:
 279                 PARA_CRIT_LOG("syntax error for udp target option "
 280                         "#%d, ignoring\n", i);
 281 success:
 282                 free(arg);
 283                 continue;
 284         }
 285 }
 286
 287 static char *udp_help(void)
 288 {
 289         return make_message(
 290                 "usage: {on|off}\n"
 291                 "usage: {add|delete} IP port\n"
 292                 "example: add 224.0.1.38 8000 (multicast streaming)\n"
 293         );
 294 }
 295
 296 /**
 297  * The init function of para_server's udp sender.
 298  *
 299  * \param s Pointer to the http sender struct.
 300  *
 301  * It initializes all function pointers of \a s and the list of udp targets.
 302  */
 303 void udp_send_init(struct sender *s)
 304 {
 305         INIT_LIST_HEAD(&targets);
 306         s->info = udp_info;
 307         s->help = udp_help;
 308         s->send = udp_send;
 309         s->pre_select = NULL;
 310         s->post_select = NULL;
 311         s->shutdown_clients = udp_shutdown_targets;
 312         s->client_cmds[SENDER_ON] = udp_com_on;
 313         s->client_cmds[SENDER_OFF] = udp_com_off;
 314         s->client_cmds[SENDER_DENY] = NULL;
 315         s->client_cmds[SENDER_ALLOW] = NULL;
 316         s->client_cmds[SENDER_ADD] = udp_com_add;
 317         s->client_cmds[SENDER_DELETE] = udp_com_delete;
 318         sender_status = SENDER_OFF;
 319         udp_init_target_list();
 320         if (!conf.udp_no_autostart_given)
 321                 sender_status = SENDER_ON;
 322         PARA_DEBUG_LOG("udp sender init complete\n");
 323 }