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         ret = mark_fd_nonblocking(ut->fd);
  88         if (ret < 0)
  89                 close(ut->fd);
  90         return ret;
  91 }
  92
  93 static void udp_shutdown_targets(void)
  94 {
  95         char buf[UDP_AUDIO_HEADER_LEN];
  96         struct udp_target *ut, *tmp;
  97
  98         udp_write_packet_type(buf, UDP_EOF_PACKET);
  99         udp_write_magic(buf);
 100         list_for_each_entry_safe(ut, tmp, &targets, node) {
 101                 if (ut->fd < 0)
 102                         continue;
 103                 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
 104                 close(ut->fd);
 105                 ut->fd = -1;
 106         }
 107 }
 108
 109 static int need_extra_header(long unsigned current_chunk)
 110 {
 111         static struct timeval last_header;
 112         struct timeval diff;
 113
 114         if (!current_chunk)
 115                 return 0;
 116         tv_diff(now, &last_header, &diff);
 117         if (tv2ms(&diff) < conf.udp_header_interval_arg)
 118                 return 0;
 119         last_header = *now;
 120         return 1;
 121 }
 122
 123 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
 124                 const char *buf, size_t len, const char *header_buf,
 125                 size_t header_len)
 126 {
 127         struct udp_target *ut, *tmp;
 128         size_t sendbuf_len;
 129         uint8_t packet_type = UDP_DATA_PACKET;
 130         int ret;
 131         char *sendbuf;
 132         struct timeval *chunk_tv;
 133         uint8_t stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
 134
 135 //      PARA_NOTICE_LOG("header_len: %zd, header_buf: %p\n", header_len,
 136 //              header_buf);
 137         if (sender_status != SENDER_ON)
 138                 return;
 139
 140         /* we might not yet know the chunk time */
 141         chunk_tv = vss_chunk_time();
 142         if (!chunk_tv)
 143                 return;
 144         if (list_empty(&targets))
 145                 return;
 146         list_for_each_entry_safe(ut, tmp, &targets, node) {
 147                 ret = udp_init_session(ut);
 148                 if (ret < 0)
 149                         udp_delete_target(ut, para_strerror(-ret));
 150         }
 151         if (!need_extra_header(current_chunk))
 152                 header_len = 0;
 153         if (!current_chunk)
 154                 packet_type = UDP_BOF_PACKET;
 155         else if (header_len)
 156                 packet_type = UDP_HEADER_PACKET;
 157         sendbuf_len = UDP_AUDIO_HEADER_LEN + header_len + len;
 158         sendbuf = para_malloc(sendbuf_len);
 159         udp_write_magic(sendbuf);
 160         udp_write_stream_type(sendbuf, stream_type);
 161         udp_write_packet_type(sendbuf, packet_type);
 162         udp_write_header_len(sendbuf, header_len);
 163         if (header_len)
 164                 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
 165                         header_len);
 166         memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + header_len, buf, len);
 167         udp_send_buf(sendbuf, sendbuf_len);
 168         free(sendbuf);
 169 }
 170
 171 static int udp_com_on(__a_unused struct sender_command_data *scd)
 172 {
 173         sender_status = SENDER_ON;
 174         return 1;
 175 }
 176
 177 static int udp_com_off(__a_unused struct sender_command_data *scd)
 178 {
 179         udp_shutdown_targets();
 180         sender_status = SENDER_OFF;
 181         return 1;
 182 }
 183
 184 static int udp_com_delete(struct sender_command_data *scd)
 185 {
 186         char *a = para_strdup(inet_ntoa(scd->addr));
 187         struct udp_target *ut, *tmp;
 188         list_for_each_entry_safe(ut, tmp, &targets, node) {
 189                 if (scd->port != ut->port)
 190                         continue;
 191                 if (strcmp(TARGET_ADDR(ut), a))
 192                         continue;
 193                 udp_delete_target(ut, "com_delete");
 194         }
 195         return 1;
 196 }
 197
 198 static void udp_add_target(int port, struct in_addr *addr)
 199 {
 200         struct udp_target *ut = para_calloc(sizeof(struct udp_target));
 201         ut->port = port;
 202         ut->addr = *addr;
 203         ut->fd = -1; /* not yet connected */
 204         PARA_INFO_LOG("adding to target list (%s:%d)\n",
 205                 TARGET_ADDR(ut), ut->port);
 206         para_list_add(&ut->node, &targets);
 207 }
 208
 209 static int udp_com_add(struct sender_command_data *scd)
 210 {
 211         int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
 212         udp_add_target(port, &scd->addr);
 213         return 1;
 214 }
 215
 216 static char *udp_info(void)
 217 {
 218         struct udp_target *ut;
 219         char *ret, *tgts = NULL;
 220
 221         list_for_each_entry(ut, &targets, node) {
 222                 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
 223                         TARGET_ADDR(ut), ut->port);
 224                 free(tgts);
 225                 tgts = tmp;
 226         }
 227         ret = make_message(
 228                 "udp sender:\n"
 229                 "\tstatus: %s\n"
 230                 "\tport: udp %d\n"
 231                 "\ttargets: %s\n",
 232                 (sender_status == SENDER_ON)? "on" : "off",
 233                 conf.udp_default_port_arg,
 234                 tgts? tgts : "(none)"
 235         );
 236         free(tgts);
 237         return ret;
 238 }
 239
 240 static void udp_init_target_list(void)
 241 {
 242         int i;
 243
 244         INIT_LIST_HEAD(&targets);
 245         for (i = 0; i < conf.udp_target_given; i++) {
 246                 char *arg = para_strdup(conf.udp_target_arg[i]);
 247                 char *p = strchr(arg, ':');
 248                 int port;
 249                 struct in_addr addr;
 250
 251                 if (!p)
 252                         goto err;
 253                 *p = '\0';
 254                 if (!inet_pton(AF_INET, arg, &addr))
 255                         goto err;
 256                 port = atoi(++p);
 257                 if (port < 0 || port > 65535)
 258                         port = conf.udp_default_port_arg;
 259                 udp_add_target(port, &addr);
 260                 goto success;
 261 err:
 262                 PARA_CRIT_LOG("syntax error for udp target option "
 263                         "#%d, ignoring\n", i);
 264 success:
 265                 free(arg);
 266                 continue;
 267         }
 268 }
 269
 270 static char *udp_help(void)
 271 {
 272         return make_message(
 273                 "usage: {on|off}\n"
 274                 "usage: {add|delete} IP port\n"
 275                 "example: add 224.0.1.38 8000 (multicast streaming)\n"
 276         );
 277 }
 278
 279 /**
 280  * The init function of para_server's udp sender.
 281  *
 282  * \param s Pointer to the http sender struct.
 283  *
 284  * It initializes all function pointers of \a s and the list of udp targets.
 285  */
 286 void udp_send_init(struct sender *s)
 287 {
 288         INIT_LIST_HEAD(&targets);
 289         s->info = udp_info;
 290         s->help = udp_help;
 291         s->send = udp_send;
 292         s->pre_select = NULL;
 293         s->post_select = NULL;
 294         s->shutdown_clients = udp_shutdown_targets;
 295         s->client_cmds[SENDER_ON] = udp_com_on;
 296         s->client_cmds[SENDER_OFF] = udp_com_off;
 297         s->client_cmds[SENDER_DENY] = NULL;
 298         s->client_cmds[SENDER_ALLOW] = NULL;
 299         s->client_cmds[SENDER_ADD] = udp_com_add;
 300         s->client_cmds[SENDER_DELETE] = udp_com_delete;
 301         sender_status = SENDER_OFF;
 302         udp_init_target_list();
 303         if (!conf.udp_no_autostart_given)
 304                 sender_status = SENDER_ON;
 305         PARA_DEBUG_LOG("udp sender init complete\n");
 306 }