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 = send_queued_chunks(ut->fd, ut->cq, 0);
  80                 if (ret < 0) {
  81                         udp_delete_target(ut, para_strerror(-ret));
  82                         continue;
  83                 }
  84                 if (!len)
  85                         continue;
  86                 if (!ret) { /* still data left in the queue */
  87                         ret = cq_enqueue(ut->cq, buf, len);
  88                         if (ret < 0) {
  89                                 udp_delete_target(ut, para_strerror(-ret));
  90                                 continue;
  91                         }
  92                 }
  93                 ret = write_nonblock(ut->fd, buf, len, 0);
  94                 if (ret < 0) {
  95                         udp_delete_target(ut, para_strerror(-ret));
  96                         continue;
  97                 }
  98                 if (ret != len) {
  99                         ret = cq_enqueue(ut->cq, buf + ret, len - ret);
 100                         if (ret < 0) {
 101                                 udp_delete_target(ut, para_strerror(-ret));
 102                                 continue;
 103                         }
 104                 }
 105         }
 106 }
 107
 108 #define UDP_CQ_BYTES 40000
 109
 110 static int udp_init_session(struct udp_target *ut)
 111 {
 112         int ret;
 113
 114         if (ut->fd >= 0) /* nothing to do */
 115                 return 0;
 116         PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
 117         ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port,
 118                 conf.udp_ttl_arg);
 119         if (ret < 0)
 120                 return ret;
 121         ut->fd = ret;
 122         ret = mark_fd_nonblocking(ut->fd);
 123         if (ret < 0) {
 124                 close(ut->fd);
 125                 return ret;
 126         }
 127         add_close_on_fork_list(ut->fd);
 128         ut->cq = cq_new(UDP_CQ_BYTES);
 129         return 1;
 130 }
 131
 132 static void udp_shutdown_targets(void)
 133 {
 134         char buf[UDP_AUDIO_HEADER_LEN];
 135         struct udp_target *ut, *tmp;
 136
 137         udp_write_packet_type(buf, UDP_EOF_PACKET);
 138         udp_write_magic(buf);
 139         list_for_each_entry_safe(ut, tmp, &targets, node) {
 140                 if (ut->fd < 0)
 141                         continue;
 142                 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
 143                 udp_close_target(ut);
 144         }
 145 }
 146
 147 static int need_extra_header(long unsigned current_chunk)
 148 {
 149         static struct timeval last_header;
 150         struct timeval diff;
 151
 152         if (!current_chunk)
 153                 return 0;
 154         tv_diff(now, &last_header, &diff);
 155         if (tv2ms(&diff) < conf.udp_header_interval_arg)
 156                 return 0;
 157         last_header = *now;
 158         return 1;
 159 }
 160
 161 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
 162                 const char *buf, size_t len, const char *header_buf,
 163                 size_t header_len)
 164 {
 165         struct udp_target *ut, *tmp;
 166         size_t sendbuf_len;
 167         uint8_t packet_type = UDP_DATA_PACKET;
 168         int ret;
 169         char *sendbuf;
 170         struct timeval *chunk_tv;
 171         uint8_t stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
 172
 173 //      PARA_NOTICE_LOG("header_len: %zd, header_buf: %p\n", header_len,
 174 //              header_buf);
 175         if (sender_status != SENDER_ON)
 176                 return;
 177
 178         /* we might not yet know the chunk time */
 179         chunk_tv = vss_chunk_time();
 180         if (!chunk_tv)
 181                 return;
 182         if (list_empty(&targets))
 183                 return;
 184         list_for_each_entry_safe(ut, tmp, &targets, node) {
 185                 ret = udp_init_session(ut);
 186                 if (ret < 0)
 187                         udp_delete_target(ut, para_strerror(-ret));
 188         }
 189         if (!need_extra_header(current_chunk))
 190                 header_len = 0;
 191         if (!current_chunk)
 192                 packet_type = UDP_BOF_PACKET;
 193         else if (header_len)
 194                 packet_type = UDP_HEADER_PACKET;
 195         sendbuf_len = UDP_AUDIO_HEADER_LEN + header_len + len;
 196         sendbuf = para_malloc(sendbuf_len);
 197         udp_write_magic(sendbuf);
 198         udp_write_stream_type(sendbuf, stream_type);
 199         udp_write_packet_type(sendbuf, packet_type);
 200         udp_write_header_len(sendbuf, header_len);
 201         if (header_len)
 202                 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
 203                         header_len);
 204         memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + header_len, buf, len);
 205         udp_send_buf(sendbuf, sendbuf_len);
 206         free(sendbuf);
 207 }
 208
 209 static int udp_com_on(__a_unused struct sender_command_data *scd)
 210 {
 211         sender_status = SENDER_ON;
 212         return 1;
 213 }
 214
 215 static int udp_com_off(__a_unused struct sender_command_data *scd)
 216 {
 217         udp_shutdown_targets();
 218         sender_status = SENDER_OFF;
 219         return 1;
 220 }
 221
 222 static int udp_com_delete(struct sender_command_data *scd)
 223 {
 224         char *a = para_strdup(inet_ntoa(scd->addr));
 225         struct udp_target *ut, *tmp;
 226         list_for_each_entry_safe(ut, tmp, &targets, node) {
 227                 if (scd->port != ut->port)
 228                         continue;
 229                 if (strcmp(TARGET_ADDR(ut), a))
 230                         continue;
 231                 udp_delete_target(ut, "com_delete");
 232         }
 233         return 1;
 234 }
 235
 236 static void udp_add_target(int port, struct in_addr *addr)
 237 {
 238         struct udp_target *ut = para_calloc(sizeof(struct udp_target));
 239         ut->port = port;
 240         ut->addr = *addr;
 241         ut->fd = -1; /* not yet connected */
 242         PARA_INFO_LOG("adding to target list (%s:%d)\n",
 243                 TARGET_ADDR(ut), ut->port);
 244         para_list_add(&ut->node, &targets);
 245 }
 246
 247 static int udp_com_add(struct sender_command_data *scd)
 248 {
 249         int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
 250         udp_add_target(port, &scd->addr);
 251         return 1;
 252 }
 253
 254 static char *udp_info(void)
 255 {
 256         struct udp_target *ut;
 257         char *ret, *tgts = NULL;
 258
 259         list_for_each_entry(ut, &targets, node) {
 260                 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
 261                         TARGET_ADDR(ut), ut->port);
 262                 free(tgts);
 263                 tgts = tmp;
 264         }
 265         ret = make_message(
 266                 "udp sender:\n"
 267                 "\tstatus: %s\n"
 268                 "\tport: udp %d\n"
 269                 "\ttargets: %s\n",
 270                 (sender_status == SENDER_ON)? "on" : "off",
 271                 conf.udp_default_port_arg,
 272                 tgts? tgts : "(none)"
 273         );
 274         free(tgts);
 275         return ret;
 276 }
 277
 278 static void udp_init_target_list(void)
 279 {
 280         int i;
 281
 282         INIT_LIST_HEAD(&targets);
 283         for (i = 0; i < conf.udp_target_given; i++) {
 284                 char *arg = para_strdup(conf.udp_target_arg[i]);
 285                 char *p = strchr(arg, ':');
 286                 int port;
 287                 struct in_addr addr;
 288
 289                 if (!p)
 290                         goto err;
 291                 *p = '\0';
 292                 if (!inet_pton(AF_INET, arg, &addr))
 293                         goto err;
 294                 port = atoi(++p);
 295                 if (port < 0 || port > 65535)
 296                         port = conf.udp_default_port_arg;
 297                 udp_add_target(port, &addr);
 298                 goto success;
 299 err:
 300                 PARA_CRIT_LOG("syntax error for udp target option "
 301                         "#%d, ignoring\n", i);
 302 success:
 303                 free(arg);
 304                 continue;
 305         }
 306 }
 307
 308 static char *udp_help(void)
 309 {
 310         return make_message(
 311                 "usage: {on|off}\n"
 312                 "usage: {add|delete} IP port\n"
 313                 "example: add 224.0.1.38 8000 (multicast streaming)\n"
 314         );
 315 }
 316
 317 /**
 318  * The init function of para_server's udp sender.
 319  *
 320  * \param s Pointer to the http sender struct.
 321  *
 322  * It initializes all function pointers of \a s and the list of udp targets.
 323  */
 324 void udp_send_init(struct sender *s)
 325 {
 326         INIT_LIST_HEAD(&targets);
 327         s->info = udp_info;
 328         s->help = udp_help;
 329         s->send = udp_send;
 330         s->pre_select = NULL;
 331         s->post_select = NULL;
 332         s->shutdown_clients = udp_shutdown_targets;
 333         s->client_cmds[SENDER_ON] = udp_com_on;
 334         s->client_cmds[SENDER_OFF] = udp_com_off;
 335         s->client_cmds[SENDER_DENY] = NULL;
 336         s->client_cmds[SENDER_ALLOW] = NULL;
 337         s->client_cmds[SENDER_ADD] = udp_com_add;
 338         s->client_cmds[SENDER_DELETE] = udp_com_delete;
 339         sender_status = SENDER_OFF;
 340         udp_init_target_list();
 341         if (!conf.udp_no_autostart_given)
 342                 sender_status = SENDER_ON;
 343         PARA_DEBUG_LOG("udp sender init complete\n");
 344 }