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 #define UDP_CQ_BYTES 40000
  72
  73 static int udp_init_session(struct udp_target *ut)
  74 {
  75         int ret;
  76
  77         if (ut->fd >= 0) /* nothing to do */
  78                 return 0;
  79         ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port,
  80                 conf.udp_ttl_arg);
  81         if (ret < 0)
  82                 return ret;
  83         ut->fd = ret;
  84         ret = mark_fd_nonblocking(ut->fd);
  85         if (ret < 0) {
  86                 close(ut->fd);
  87                 return ret;
  88         }
  89         add_close_on_fork_list(ut->fd);
  90         ut->cq = cq_new(UDP_CQ_BYTES);
  91         PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
  92         return 1;
  93 }
  94
  95 static void udp_send_buf(char *buf, size_t len)
  96 {
  97         struct udp_target *ut, *tmp;
  98         int ret;
  99
 100         list_for_each_entry_safe(ut, tmp, &targets, node) {
 101                 ret = udp_init_session(ut);
 102                 if (ret < 0) {
 103                         udp_delete_target(ut, para_strerror(-ret));
 104                         continue;
 105                 }
 106                 ret = send_queued_chunks(ut->fd, ut->cq, 0);
 107                 if (ret < 0) {
 108                         udp_delete_target(ut, para_strerror(-ret));
 109                         continue;
 110                 }
 111                 if (!len)
 112                         continue;
 113                 if (!ret) { /* still data left in the queue */
 114                         ret = cq_enqueue(ut->cq, buf, len);
 115                         if (ret < 0) {
 116                                 udp_delete_target(ut, para_strerror(-ret));
 117                                 continue;
 118                         }
 119                 }
 120                 ret = write_nonblock(ut->fd, buf, len, 0);
 121                 if (ret < 0) {
 122                         udp_delete_target(ut, para_strerror(-ret));
 123                         continue;
 124                 }
 125                 if (ret != len) {
 126                         ret = cq_enqueue(ut->cq, buf + ret, len - ret);
 127                         if (ret < 0) {
 128                                 udp_delete_target(ut, para_strerror(-ret));
 129                                 continue;
 130                         }
 131                 }
 132         }
 133 }
 134
 135 static void udp_shutdown_targets(void)
 136 {
 137         char buf[UDP_AUDIO_HEADER_LEN];
 138         struct udp_target *ut, *tmp;
 139
 140         udp_write_packet_type(buf, UDP_EOF_PACKET);
 141         udp_write_magic(buf);
 142         list_for_each_entry_safe(ut, tmp, &targets, node) {
 143                 if (ut->fd < 0)
 144                         continue;
 145                 write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
 146                 udp_close_target(ut);
 147         }
 148 }
 149
 150 static int need_extra_header(long unsigned current_chunk)
 151 {
 152         static struct timeval last_header;
 153         struct timeval diff;
 154
 155         if (!current_chunk)
 156                 return 0;
 157         tv_diff(now, &last_header, &diff);
 158         if (tv2ms(&diff) < conf.udp_header_interval_arg)
 159                 return 0;
 160         last_header = *now;
 161         return 1;
 162 }
 163
 164 static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunks_sent,
 165                 const char *buf, size_t len, const char *header_buf,
 166                 size_t header_len)
 167 {
 168         size_t sendbuf_len;
 169         uint8_t packet_type = UDP_DATA_PACKET;
 170         char *sendbuf;
 171         struct timeval *chunk_tv;
 172         uint8_t stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
 173
 174 //      PARA_NOTICE_LOG("len: %zd, header_len: %zd\n", len, header_len);
 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         if (!need_extra_header(current_chunk))
 185                 header_len = 0;
 186         if (!current_chunk)
 187                 packet_type = UDP_BOF_PACKET;
 188         else if (header_len)
 189                 packet_type = UDP_HEADER_PACKET;
 190         sendbuf_len = UDP_AUDIO_HEADER_LEN + header_len + len;
 191         sendbuf = para_malloc(sendbuf_len);
 192         udp_write_magic(sendbuf);
 193         udp_write_stream_type(sendbuf, stream_type);
 194         udp_write_packet_type(sendbuf, packet_type);
 195         udp_write_header_len(sendbuf, header_len);
 196         if (header_len)
 197                 memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
 198                         header_len);
 199         memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + header_len, buf, len);
 200         udp_send_buf(sendbuf, sendbuf_len);
 201         free(sendbuf);
 202 }
 203
 204 static int udp_com_on(__a_unused struct sender_command_data *scd)
 205 {
 206         sender_status = SENDER_ON;
 207         return 1;
 208 }
 209
 210 static int udp_com_off(__a_unused struct sender_command_data *scd)
 211 {
 212         udp_shutdown_targets();
 213         sender_status = SENDER_OFF;
 214         return 1;
 215 }
 216
 217 static int udp_com_delete(struct sender_command_data *scd)
 218 {
 219         char *a = para_strdup(inet_ntoa(scd->addr));
 220         struct udp_target *ut, *tmp;
 221         list_for_each_entry_safe(ut, tmp, &targets, node) {
 222                 if (scd->port != ut->port)
 223                         continue;
 224                 if (strcmp(TARGET_ADDR(ut), a))
 225                         continue;
 226                 udp_delete_target(ut, "com_delete");
 227         }
 228         return 1;
 229 }
 230
 231 static void udp_add_target(int port, struct in_addr *addr)
 232 {
 233         struct udp_target *ut = para_calloc(sizeof(struct udp_target));
 234         ut->port = port;
 235         ut->addr = *addr;
 236         ut->fd = -1; /* not yet connected */
 237         PARA_INFO_LOG("adding to target list (%s:%d)\n",
 238                 TARGET_ADDR(ut), ut->port);
 239         para_list_add(&ut->node, &targets);
 240 }
 241
 242 static int udp_com_add(struct sender_command_data *scd)
 243 {
 244         int port = (scd->port > 0)? scd->port : conf.udp_default_port_arg;
 245         udp_add_target(port, &scd->addr);
 246         return 1;
 247 }
 248
 249 static char *udp_info(void)
 250 {
 251         struct udp_target *ut;
 252         char *ret, *tgts = NULL;
 253
 254         list_for_each_entry(ut, &targets, node) {
 255                 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
 256                         TARGET_ADDR(ut), ut->port);
 257                 free(tgts);
 258                 tgts = tmp;
 259         }
 260         ret = make_message(
 261                 "udp sender:\n"
 262                 "\tstatus: %s\n"
 263                 "\tport: udp %d\n"
 264                 "\ttargets: %s\n",
 265                 (sender_status == SENDER_ON)? "on" : "off",
 266                 conf.udp_default_port_arg,
 267                 tgts? tgts : "(none)"
 268         );
 269         free(tgts);
 270         return ret;
 271 }
 272
 273 static void udp_init_target_list(void)
 274 {
 275         int i;
 276
 277         INIT_LIST_HEAD(&targets);
 278         for (i = 0; i < conf.udp_target_given; i++) {
 279                 char *arg = para_strdup(conf.udp_target_arg[i]);
 280                 char *p = strchr(arg, ':');
 281                 int port;
 282                 struct in_addr addr;
 283
 284                 if (!p)
 285                         goto err;
 286                 *p = '\0';
 287                 if (!inet_pton(AF_INET, arg, &addr))
 288                         goto err;
 289                 port = atoi(++p);
 290                 if (port < 0 || port > 65535)
 291                         port = conf.udp_default_port_arg;
 292                 udp_add_target(port, &addr);
 293                 goto success;
 294 err:
 295                 PARA_CRIT_LOG("syntax error for udp target option "
 296                         "#%d, ignoring\n", i);
 297 success:
 298                 free(arg);
 299                 continue;
 300         }
 301 }
 302
 303 static char *udp_help(void)
 304 {
 305         return make_message(
 306                 "usage: {on|off}\n"
 307                 "usage: {add|delete} IP port\n"
 308                 "example: add 224.0.1.38 8000 (multicast streaming)\n"
 309         );
 310 }
 311
 312 /**
 313  * The init function of para_server's udp sender.
 314  *
 315  * \param s Pointer to the http sender struct.
 316  *
 317  * It initializes all function pointers of \a s and the list of udp targets.
 318  */
 319 void udp_send_init(struct sender *s)
 320 {
 321         INIT_LIST_HEAD(&targets);
 322         s->info = udp_info;
 323         s->help = udp_help;
 324         s->send = udp_send;
 325         s->pre_select = NULL;
 326         s->post_select = NULL;
 327         s->shutdown_clients = udp_shutdown_targets;
 328         s->client_cmds[SENDER_ON] = udp_com_on;
 329         s->client_cmds[SENDER_OFF] = udp_com_off;
 330         s->client_cmds[SENDER_DENY] = NULL;
 331         s->client_cmds[SENDER_ALLOW] = NULL;
 332         s->client_cmds[SENDER_ADD] = udp_com_add;
 333         s->client_cmds[SENDER_DELETE] = udp_com_delete;
 334         sender_status = SENDER_OFF;
 335         udp_init_target_list();
 336         if (!conf.udp_no_autostart_given)
 337                 sender_status = SENDER_ON;
 338         PARA_DEBUG_LOG("udp sender init complete\n");
 339 }