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
  29
  30 /** Convert in_addr to ascii. */
  31 #define TARGET_ADDR(oc) inet_ntoa((oc)->addr)
  32
  33 /** Describes one entry in the list of targets for the udp sender. */
  34 struct udp_target {
  35         /** Address info. */
  36         struct in_addr addr;
  37         /** The position of this target in the list of targets. */
  38         struct list_head node;
  39         /** The UDP port. */
  40         int port;
  41         /** The socket fd. */
  42         int fd;
  43 };
  44
  45 static struct list_head targets;
  46 static int sender_status;
  47
  48 static void udp_delete_target(struct udp_target *ut, const char *msg)
  49 {
  50         PARA_NOTICE_LOG("deleting %s:%d (%s) from list\n", TARGET_ADDR(ut),
  51                 ut->port, msg);
  52         if (ut->fd >= 0)
  53                 close(ut->fd);
  54         list_del(&ut->node);
  55         free(ut);
  56 }
  57
  58 static void udp_send_buf(char *buf, size_t len)
  59 {
  60         struct udp_target *ut, *tmp;
  61         int ret;
  62
  63         list_for_each_entry_safe(ut, tmp, &targets, node) {
  64                 if (ut->fd < 0)
  65                         continue;
  66                 ret = write_nonblock(ut->fd, buf, len, len);
  67                 if (ret < 0) /* TODO: Use chunk queueing */
  68                         return udp_delete_target(ut, "send error");
  69                 if (ret != len)
  70                         PARA_WARNING_LOG("short write %zu/%zu\n", ret, len);
  71         }
  72 }
  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         PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
  81         ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port,
  82                 conf.udp_ttl_arg);
  83         if (ret < 0)
  84                 return ret;
  85         ut->fd = ret;
  86         ret = mark_fd_nonblocking(ut->fd);
  87         if (ret < 0)
  88                 close(ut->fd);
  89         return ret;
  90 }
  91
  92 static void udp_shutdown_targets(void)
  93 {
  94         char buf[UDP_AUDIO_HEADER_LEN];
  95         struct udp_target *ut, *tmp;
  96
  97         udp_write_packet_type(buf, UDP_EOF_PACKET);
  98         udp_write_magic(buf);
  99         list_for_each_entry_safe(ut, tmp, &targets, node) {
 100                 if (ut->fd < 0)
 101                         continue;
 102                 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
 103                 close(ut->fd);
 104                 ut->fd = -1;
 105         }
 106 }
 107
 108 static int need_extra_header(long unsigned current_chunk)
 109 {
 110         static struct timeval last_header;
 111         struct timeval diff;
 112
 113         if (!current_chunk)
 114                 return 0;
 115         tv_diff(now, &last_header, &diff);
 116         if (tv2ms(&diff) < conf.udp_header_interval_arg)
 117                 return 0;
 118         last_header = *now;
 119         return 1;
 120 }
 121
 122 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
 123                 const char *buf, size_t len, const char *header_buf,
 124                 size_t header_len)
 125 {
 126         struct udp_target *ut, *tmp;
 127         size_t sendbuf_len;
 128         uint8_t packet_type = UDP_DATA_PACKET;
 129         int ret;
 130         char *sendbuf;
 131         struct timeval *chunk_tv;
 132         uint8_t stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
 133
 134 //      PARA_NOTICE_LOG("header_len: %zd, header_buf: %p\n", header_len,
 135 //              header_buf);
 136         if (sender_status != SENDER_ON)
 137                 return;
 138
 139         /* we might not yet know the chunk time */
 140         chunk_tv = vss_chunk_time();
 141         if (!chunk_tv)
 142                 return;
 143         if (list_empty(&targets))
 144                 return;
 145         list_for_each_entry_safe(ut, tmp, &targets, node) {
 146                 ret = udp_init_session(ut);
 147                 if (ret < 0)
 148                         udp_delete_target(ut, para_strerror(-ret));
 149         }
 150         if (!need_extra_header(current_chunk))
 151                 header_len = 0;
 152         if (!current_chunk)
 153                 packet_type = UDP_BOF_PACKET;
 154         else if (header_len)
 155                 packet_type = UDP_HEADER_PACKET;
 156         sendbuf_len = UDP_AUDIO_HEADER_LEN + header_len + len;
 157         sendbuf = para_malloc(sendbuf_len);
 158         udp_write_magic(sendbuf);
 159         udp_write_stream_type(sendbuf, stream_type);
 160         udp_write_packet_type(sendbuf, packet_type);
 161         udp_write_header_len(sendbuf, header_len);
 162         if (header_len)
 163                 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
 164                         header_len);
 165         memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + header_len, buf, len);
 166         udp_send_buf(sendbuf, sendbuf_len);
 167         free(sendbuf);
 168 }
 169
 170 static int udp_com_on(__a_unused struct sender_command_data *scd)
 171 {
 172         sender_status = SENDER_ON;
 173         return 1;
 174 }
 175
 176 static int udp_com_off(__a_unused struct sender_command_data *scd)
 177 {
 178         udp_shutdown_targets();
 179         sender_status = SENDER_OFF;
 180         return 1;
 181 }
 182
 183 static int udp_com_delete(struct sender_command_data *scd)
 184 {
 185         char *a = para_strdup(inet_ntoa(scd->addr));
 186         struct udp_target *ut, *tmp;
 187         list_for_each_entry_safe(ut, tmp, &targets, node) {
 188                 if (scd->port != ut->port)
 189                         continue;
 190                 if (strcmp(TARGET_ADDR(ut), a))
 191                         continue;
 192                 udp_delete_target(ut, "com_delete");
 193         }
 194         return 1;
 195 }
 196
 197 static void udp_add_target(int port, struct in_addr *addr)
 198 {
 199         struct udp_target *ut = para_calloc(sizeof(struct udp_target));
 200         ut->port = port;
 201         ut->addr = *addr;
 202         ut->fd = -1; /* not yet connected */
 203         PARA_INFO_LOG("adding to target list (%s:%d)\n",
 204                 TARGET_ADDR(ut), ut->port);
 205         para_list_add(&ut->node, &targets);
 206 }
 207
 208 static int udp_com_add(struct sender_command_data *scd)
 209 {
 210         int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
 211         udp_add_target(port, &scd->addr);
 212         return 1;
 213 }
 214
 215 static char *udp_info(void)
 216 {
 217         struct udp_target *ut;
 218         char *ret, *tgts = NULL;
 219
 220         list_for_each_entry(ut, &targets, node) {
 221                 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
 222                         TARGET_ADDR(ut), ut->port);
 223                 free(tgts);
 224                 tgts = tmp;
 225         }
 226         ret = make_message(
 227                 "udp sender:\n"
 228                 "\tstatus: %s\n"
 229                 "\tport: udp %d\n"
 230                 "\ttargets: %s\n",
 231                 (sender_status == SENDER_ON)? "on" : "off",
 232                 conf.udp_default_port_arg,
 233                 tgts? tgts : "(none)"
 234         );
 235         free(tgts);
 236         return ret;
 237 }
 238
 239 static void udp_init_target_list(void)
 240 {
 241         int i;
 242
 243         INIT_LIST_HEAD(&targets);
 244         for (i = 0; i < conf.udp_target_given; i++) {
 245                 char *arg = para_strdup(conf.udp_target_arg[i]);
 246                 char *p = strchr(arg, ':');
 247                 int port;
 248                 struct in_addr addr;
 249
 250                 if (!p)
 251                         goto err;
 252                 *p = '\0';
 253                 if (!inet_pton(AF_INET, arg, &addr))
 254                         goto err;
 255                 port = atoi(++p);
 256                 if (port < 0 || port > 65535)
 257                         port = conf.udp_default_port_arg;
 258                 udp_add_target(port, &addr);
 259                 goto success;
 260 err:
 261                 PARA_CRIT_LOG("syntax error for udp target option "
 262                         "#%d, ignoring\n", i);
 263 success:
 264                 free(arg);
 265                 continue;
 266         }
 267 }
 268
 269 static char *udp_help(void)
 270 {
 271         return make_message(
 272                 "usage: {on|off}\n"
 273                 "usage: {add|delete} IP port\n"
 274                 "example: add 224.0.1.38 8000 (multicast streaming)\n"
 275         );
 276 }
 277
 278 /**
 279  * The init function of para_server's udp sender.
 280  *
 281  * \param s Pointer to the http sender struct.
 282  *
 283  * It initializes all function pointers of \a s and the list of udp targets.
 284  */
 285 void udp_send_init(struct sender *s)
 286 {
 287         INIT_LIST_HEAD(&targets);
 288         s->info = udp_info;
 289         s->help = udp_help;
 290         s->send = udp_send;
 291         s->pre_select = NULL;
 292         s->post_select = NULL;
 293         s->shutdown_clients = udp_shutdown_targets;
 294         s->client_cmds[SENDER_ON] = udp_com_on;
 295         s->client_cmds[SENDER_OFF] = udp_com_off;
 296         s->client_cmds[SENDER_DENY] = NULL;
 297         s->client_cmds[SENDER_ALLOW] = NULL;
 298         s->client_cmds[SENDER_ADD] = udp_com_add;
 299         s->client_cmds[SENDER_DELETE] = udp_com_delete;
 300         sender_status = SENDER_OFF;
 301         udp_init_target_list();
 302         if (!conf.udp_no_autostart_given)
 303                 sender_status = SENDER_ON;
 304         PARA_DEBUG_LOG("udp sender init complete\n");
 305 }