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