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) {
  81                         udp_delete_target(ut, para_strerror(-ret));
  82                         continue;
  83                 }
  84                 if (ret != len)
  85                         PARA_WARNING_LOG("short write %zu/%zu\n", ret, len);
  86         }
  87 }
  88
  89 #define UDP_CQ_BYTES 40000
  90
  91 static int udp_init_session(struct udp_target *ut)
  92 {
  93         int ret;
  94
  95         if (ut->fd >= 0) /* nothing to do */
  96                 return 0;
  97         PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
  98         ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port,
  99                 conf.udp_ttl_arg);
 100         if (ret < 0)
 101                 return ret;
 102         ut->fd = ret;
 103         ret = mark_fd_nonblocking(ut->fd);
 104         if (ret < 0) {
 105                 close(ut->fd);
 106                 return ret;
 107         }
 108         add_close_on_fork_list(ut->fd);
 109         ut->cq = cq_new(UDP_CQ_BYTES);
 110         return 1;
 111 }
 112
 113 static void udp_shutdown_targets(void)
 114 {
 115         char buf[UDP_AUDIO_HEADER_LEN];
 116         struct udp_target *ut, *tmp;
 117
 118         udp_write_packet_type(buf, UDP_EOF_PACKET);
 119         udp_write_magic(buf);
 120         list_for_each_entry_safe(ut, tmp, &targets, node) {
 121                 if (ut->fd < 0)
 122                         continue;
 123                 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
 124                 udp_close_target(ut);
 125         }
 126 }
 127
 128 static int need_extra_header(long unsigned current_chunk)
 129 {
 130         static struct timeval last_header;
 131         struct timeval diff;
 132
 133         if (!current_chunk)
 134                 return 0;
 135         tv_diff(now, &last_header, &diff);
 136         if (tv2ms(&diff) < conf.udp_header_interval_arg)
 137                 return 0;
 138         last_header = *now;
 139         return 1;
 140 }
 141
 142 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
 143                 const char *buf, size_t len, const char *header_buf,
 144                 size_t header_len)
 145 {
 146         struct udp_target *ut, *tmp;
 147         size_t sendbuf_len;
 148         uint8_t packet_type = UDP_DATA_PACKET;
 149         int ret;
 150         char *sendbuf;
 151         struct timeval *chunk_tv;
 152         uint8_t stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
 153
 154 //      PARA_NOTICE_LOG("header_len: %zd, header_buf: %p\n", header_len,
 155 //              header_buf);
 156         if (sender_status != SENDER_ON)
 157                 return;
 158
 159         /* we might not yet know the chunk time */
 160         chunk_tv = vss_chunk_time();
 161         if (!chunk_tv)
 162                 return;
 163         if (list_empty(&targets))
 164                 return;
 165         list_for_each_entry_safe(ut, tmp, &targets, node) {
 166                 ret = udp_init_session(ut);
 167                 if (ret < 0)
 168                         udp_delete_target(ut, para_strerror(-ret));
 169         }
 170         if (!need_extra_header(current_chunk))
 171                 header_len = 0;
 172         if (!current_chunk)
 173                 packet_type = UDP_BOF_PACKET;
 174         else if (header_len)
 175                 packet_type = UDP_HEADER_PACKET;
 176         sendbuf_len = UDP_AUDIO_HEADER_LEN + header_len + len;
 177         sendbuf = para_malloc(sendbuf_len);
 178         udp_write_magic(sendbuf);
 179         udp_write_stream_type(sendbuf, stream_type);
 180         udp_write_packet_type(sendbuf, packet_type);
 181         udp_write_header_len(sendbuf, header_len);
 182         if (header_len)
 183                 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
 184                         header_len);
 185         memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + header_len, buf, len);
 186         udp_send_buf(sendbuf, sendbuf_len);
 187         free(sendbuf);
 188 }
 189
 190 static int udp_com_on(__a_unused struct sender_command_data *scd)
 191 {
 192         sender_status = SENDER_ON;
 193         return 1;
 194 }
 195
 196 static int udp_com_off(__a_unused struct sender_command_data *scd)
 197 {
 198         udp_shutdown_targets();
 199         sender_status = SENDER_OFF;
 200         return 1;
 201 }
 202
 203 static int udp_com_delete(struct sender_command_data *scd)
 204 {
 205         char *a = para_strdup(inet_ntoa(scd->addr));
 206         struct udp_target *ut, *tmp;
 207         list_for_each_entry_safe(ut, tmp, &targets, node) {
 208                 if (scd->port != ut->port)
 209                         continue;
 210                 if (strcmp(TARGET_ADDR(ut), a))
 211                         continue;
 212                 udp_delete_target(ut, "com_delete");
 213         }
 214         return 1;
 215 }
 216
 217 static void udp_add_target(int port, struct in_addr *addr)
 218 {
 219         struct udp_target *ut = para_calloc(sizeof(struct udp_target));
 220         ut->port = port;
 221         ut->addr = *addr;
 222         ut->fd = -1; /* not yet connected */
 223         PARA_INFO_LOG("adding to target list (%s:%d)\n",
 224                 TARGET_ADDR(ut), ut->port);
 225         para_list_add(&ut->node, &targets);
 226 }
 227
 228 static int udp_com_add(struct sender_command_data *scd)
 229 {
 230         int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
 231         udp_add_target(port, &scd->addr);
 232         return 1;
 233 }
 234
 235 static char *udp_info(void)
 236 {
 237         struct udp_target *ut;
 238         char *ret, *tgts = NULL;
 239
 240         list_for_each_entry(ut, &targets, node) {
 241                 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
 242                         TARGET_ADDR(ut), ut->port);
 243                 free(tgts);
 244                 tgts = tmp;
 245         }
 246         ret = make_message(
 247                 "udp sender:\n"
 248                 "\tstatus: %s\n"
 249                 "\tport: udp %d\n"
 250                 "\ttargets: %s\n",
 251                 (sender_status == SENDER_ON)? "on" : "off",
 252                 conf.udp_default_port_arg,
 253                 tgts? tgts : "(none)"
 254         );
 255         free(tgts);
 256         return ret;
 257 }
 258
 259 static void udp_init_target_list(void)
 260 {
 261         int i;
 262
 263         INIT_LIST_HEAD(&targets);
 264         for (i = 0; i < conf.udp_target_given; i++) {
 265                 char *arg = para_strdup(conf.udp_target_arg[i]);
 266                 char *p = strchr(arg, ':');
 267                 int port;
 268                 struct in_addr addr;
 269
 270                 if (!p)
 271                         goto err;
 272                 *p = '\0';
 273                 if (!inet_pton(AF_INET, arg, &addr))
 274                         goto err;
 275                 port = atoi(++p);
 276                 if (port < 0 || port > 65535)
 277                         port = conf.udp_default_port_arg;
 278                 udp_add_target(port, &addr);
 279                 goto success;
 280 err:
 281                 PARA_CRIT_LOG("syntax error for udp target option "
 282                         "#%d, ignoring\n", i);
 283 success:
 284                 free(arg);
 285                 continue;
 286         }
 287 }
 288
 289 static char *udp_help(void)
 290 {
 291         return make_message(
 292                 "usage: {on|off}\n"
 293                 "usage: {add|delete} IP port\n"
 294                 "example: add 224.0.1.38 8000 (multicast streaming)\n"
 295         );
 296 }
 297
 298 /**
 299  * The init function of para_server's udp sender.
 300  *
 301  * \param s Pointer to the http sender struct.
 302  *
 303  * It initializes all function pointers of \a s and the list of udp targets.
 304  */
 305 void udp_send_init(struct sender *s)
 306 {
 307         INIT_LIST_HEAD(&targets);
 308         s->info = udp_info;
 309         s->help = udp_help;
 310         s->send = udp_send;
 311         s->pre_select = NULL;
 312         s->post_select = NULL;
 313         s->shutdown_clients = udp_shutdown_targets;
 314         s->client_cmds[SENDER_ON] = udp_com_on;
 315         s->client_cmds[SENDER_OFF] = udp_com_off;
 316         s->client_cmds[SENDER_DENY] = NULL;
 317         s->client_cmds[SENDER_ALLOW] = NULL;
 318         s->client_cmds[SENDER_ADD] = udp_com_add;
 319         s->client_cmds[SENDER_DELETE] = udp_com_delete;
 320         sender_status = SENDER_OFF;
 321         udp_init_target_list();
 322         if (!conf.udp_no_autostart_given)
 323                 sender_status = SENDER_ON;
 324         PARA_DEBUG_LOG("udp sender init complete\n");
 325 }