udp_send.c

   1 /*
   2  * Copyright (C) 2005-2008 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                 size_t written = len;
  65                 if (ut->fd < 0)
  66                         continue;
  67                 ret = write_all(ut->fd, buf, &written);
  68                 if (ret < 0)
  69                         return udp_delete_target(ut, "send error");
  70                 if (written != len)
  71                         PARA_WARNING_LOG("short write %zu/%zu\n", written, len);
  72         }
  73 }
  74
  75 static void udp_init_session(struct udp_target *ut)
  76 {
  77         PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
  78         ut->fd = create_udp_send_socket(TARGET_ADDR(ut), ut->port, 10);
  79 }
  80
  81 static void udp_shutdown_targets(void)
  82 {
  83         char buf[UDP_AUDIO_HEADER_LEN];
  84         struct udp_target *ut, *tmp;
  85
  86         udp_write_packet_type(buf, UDP_EOF_PACKET);
  87         list_for_each_entry_safe(ut, tmp, &targets, node) {
  88                 if (ut->fd < 0)
  89                         continue;
  90                 PARA_INFO_LOG("sending eof to udp target %s:%d\n",
  91                         TARGET_ADDR(ut), ut->port);
  92                 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
  93         }
  94 }
  95
  96 static int need_extra_header(long unsigned current_chunk)
  97 {
  98         static struct timeval last_header;
  99         struct timeval diff;
 100
 101         if (!current_chunk)
 102                 return 0;
 103         tv_diff(now, &last_header, &diff);
 104         if (tv2ms(&diff) < conf.udp_header_interval_arg)
 105                 return 0;
 106         last_header = *now;
 107         return 1;
 108 }
 109
 110 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
 111                 const char *buf, size_t len, const char *header_buf,
 112                 size_t header_len)
 113 {
 114         struct udp_target *ut, *tmp;
 115         size_t sendbuf_len;
 116         int packet_type = UDP_DATA_PACKET;
 117         char *sendbuf;
 118         struct timeval *chunk_tv;
 119         uint8_t stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
 120
 121 //      PARA_NOTICE_LOG("header_len: %zd, header_buf: %p\n", header_len,
 122 //              header_buf);
 123         if (sender_status != SENDER_ON)
 124                 return;
 125
 126         /* we might not yet know the chunk time */
 127         chunk_tv = vss_chunk_time();
 128         if (!chunk_tv)
 129                 return;
 130         if (list_empty(&targets))
 131                 return;
 132         list_for_each_entry_safe(ut, tmp, &targets, node) {
 133                 if (ut->fd < 0)
 134                         udp_init_session(ut);
 135         }
 136         if (!need_extra_header(current_chunk))
 137                 header_len = 0;
 138         if (!current_chunk)
 139                 packet_type = UDP_BOF_PACKET;
 140         else if (header_len)
 141                 packet_type = UDP_HEADER_PACKET;
 142         sendbuf_len = UDP_AUDIO_HEADER_LEN + header_len + len;
 143         sendbuf = para_malloc(sendbuf_len);
 144         udp_write_magic(sendbuf);
 145         udp_write_stream_type(sendbuf, stream_type);
 146         udp_write_packet_type(sendbuf, packet_type);
 147         udp_write_header_len(sendbuf, header_len);
 148         if (header_len)
 149                 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
 150                         header_len);
 151         memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + header_len, buf, len);
 152         udp_send_buf(sendbuf, sendbuf_len);
 153         free(sendbuf);
 154 }
 155
 156 static int udp_com_on(__a_unused struct sender_command_data *scd)
 157 {
 158         sender_status = SENDER_ON;
 159         return 1;
 160 }
 161
 162 static int udp_com_off(__a_unused struct sender_command_data *scd)
 163 {
 164         udp_shutdown_targets();
 165         sender_status = SENDER_OFF;
 166         return 1;
 167 }
 168
 169 static int udp_com_delete(struct sender_command_data *scd)
 170 {
 171         char *a = para_strdup(inet_ntoa(scd->addr));
 172         struct udp_target *ut, *tmp;
 173         list_for_each_entry_safe(ut, tmp, &targets, node) {
 174                 if (scd->port != ut->port)
 175                         continue;
 176                 if (strcmp(TARGET_ADDR(ut), a))
 177                         continue;
 178                 udp_delete_target(ut, "com_delete");
 179         }
 180         return 1;
 181 }
 182
 183 static void udp_add_target(int port, struct in_addr *addr)
 184 {
 185         struct udp_target *ut = para_calloc(sizeof(struct udp_target));
 186         ut->port = port;
 187         ut->addr = *addr;
 188         ut->fd = -1; /* not yet connected */
 189         PARA_INFO_LOG("adding to target list (%s:%d)\n",
 190                 TARGET_ADDR(ut), ut->port);
 191         para_list_add(&ut->node, &targets);
 192 }
 193
 194 static int udp_com_add(struct sender_command_data *scd)
 195 {
 196         int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
 197         udp_add_target(port, &scd->addr);
 198         return 1;
 199 }
 200
 201 static char *udp_info(void)
 202 {
 203         struct udp_target *ut;
 204         char *ret, *tgts = NULL;
 205
 206         list_for_each_entry(ut, &targets, node) {
 207                 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
 208                         TARGET_ADDR(ut), ut->port);
 209                 free(tgts);
 210                 tgts = tmp;
 211         }
 212         ret = make_message(
 213                 "udp sender:\n"
 214                 "\tstatus: %s\n"
 215                 "\tport: udp %d\n"
 216                 "\ttargets: %s\n",
 217                 (sender_status == SENDER_ON)? "on" : "off",
 218                 conf.udp_default_port_arg,
 219                 tgts? tgts : "(none)"
 220         );
 221         free(tgts);
 222         return ret;
 223 }
 224
 225 static void udp_init_target_list(void)
 226 {
 227         int i;
 228
 229         INIT_LIST_HEAD(&targets);
 230         for (i = 0; i < conf.udp_target_given; i++) {
 231                 char *arg = para_strdup(conf.udp_target_arg[i]);
 232                 char *p = strchr(arg, ':');
 233                 int port;
 234                 struct in_addr addr;
 235
 236                 if (!p)
 237                         goto err;
 238                 *p = '\0';
 239                 if (!inet_pton(AF_INET, arg, &addr))
 240                         goto err;
 241                 port = atoi(++p);
 242                 if (port < 0 || port > 65535)
 243                         port = conf.udp_default_port_arg;
 244                 udp_add_target(port, &addr);
 245                 goto success;
 246 err:
 247                 PARA_CRIT_LOG("syntax error for udp target option "
 248                         "#%d, ignoring\n", i);
 249 success:
 250                 free(arg);
 251                 continue;
 252         }
 253 }
 254
 255 static char *udp_help(void)
 256 {
 257         return make_message(
 258                 "usage: {on|off}\n"
 259                 "usage: {add|delete} IP port\n"
 260                 "example: add 224.0.1.38 8000 (multicast streaming)\n"
 261         );
 262 }
 263
 264 /**
 265  * The init function of para_server's udp sender.
 266  *
 267  * \param s Pointer to the http sender struct.
 268  *
 269  * It initializes all function pointers of \a s and the list of udp targets.
 270  */
 271 void udp_send_init(struct sender *s)
 272 {
 273         INIT_LIST_HEAD(&targets);
 274         s->info = udp_info;
 275         s->help = udp_help;
 276         s->send = udp_send;
 277         s->pre_select = NULL;
 278         s->post_select = NULL;
 279         s->shutdown_clients = udp_shutdown_targets;
 280         s->client_cmds[SENDER_ON] = udp_com_on;
 281         s->client_cmds[SENDER_OFF] = udp_com_off;
 282         s->client_cmds[SENDER_DENY] = NULL;
 283         s->client_cmds[SENDER_ALLOW] = NULL;
 284         s->client_cmds[SENDER_ADD] = udp_com_add;
 285         s->client_cmds[SENDER_DELETE] = udp_com_delete;
 286         sender_status = SENDER_OFF;
 287         udp_init_target_list();
 288         if (!conf.udp_no_autostart_given)
 289                 sender_status = SENDER_ON;
 290         PARA_DEBUG_LOG("udp sender init complete\n");
 291 }