research.m1stereo.tv/gitweb/ - melted/blob - mlt/src/miracle/miracle_server.c

   1 /*
   2  * miracle_server.c -- DV Server
   3  * Copyright (C) 2002-2003 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /* System header files */
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <signal.h>
  26
  27 #include <fcntl.h>
  28 #include <pthread.h>
  29 #include <signal.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32
  33 #include <string.h>
  34 #include <netinet/in.h>
  35 #include <netdb.h>
  36 #include <errno.h>
  37 #include <arpa/inet.h>
  38
  39 /* Application header files */
  40 #include "miracle_server.h"
  41 #include "miracle_connection.h"
  42 #include "miracle_local.h"
  43 #include "miracle_log.h"
  44 #include <valerie/valerie_remote.h>
  45 #include <valerie/valerie_tokeniser.h>
  46
  47 #define VERSION "0.0.1"
  48
  49 /** Initialise a server structure.
  50 */
  51
  52 miracle_server miracle_server_init( char *id )
  53 {
  54         miracle_server server = malloc( sizeof( miracle_server_t ) );
  55         if ( server != NULL )
  56         {
  57                 memset( server, 0, sizeof( miracle_server_t ) );
  58                 server->id = id;
  59                 server->port = DEFAULT_TCP_PORT;
  60                 server->socket = -1;
  61         }
  62         return server;
  63 }
  64
  65 /** Set the port of the server.
  66 */
  67
  68 void miracle_server_set_port( miracle_server server, int port )
  69 {
  70         server->port = port;
  71 }
  72
  73 void miracle_server_set_proxy( miracle_server server, char *proxy )
  74 {
  75         valerie_tokeniser tokeniser = valerie_tokeniser_init( );
  76         server->proxy = 1;
  77         server->remote_port = DEFAULT_TCP_PORT;
  78         valerie_tokeniser_parse_new( tokeniser, proxy, ":" );
  79         strcpy( server->remote_server, valerie_tokeniser_get_string( tokeniser, 0 ) );
  80         if ( valerie_tokeniser_count( tokeniser ) == 2 )
  81                 server->remote_port = atoi( valerie_tokeniser_get_string( tokeniser, 1 ) );
  82         valerie_tokeniser_close( tokeniser );
  83 }
  84
  85 /** Wait for a connection.
  86 */
  87
  88 static int miracle_server_wait_for_connect( miracle_server server )
  89 {
  90     struct timeval tv;
  91     fd_set rfds;
  92
  93     /* Wait for a 1 second. */
  94     tv.tv_sec = 1;
  95     tv.tv_usec = 0;
  96
  97     FD_ZERO( &rfds );
  98     FD_SET( server->socket, &rfds );
  99
 100     return select( server->socket + 1, &rfds, NULL, NULL, &tv);
 101 }
 102
 103 /** Run the server thread.
 104 */
 105
 106 static void *miracle_server_run( void *arg )
 107 {
 108         miracle_server server = arg;
 109         pthread_t cmd_parse_info;
 110         connection_t *tmp = NULL;
 111         pthread_attr_t thread_attributes;
 112         int socksize;
 113
 114         socksize = sizeof( struct sockaddr );
 115
 116         miracle_log( LOG_NOTICE, "%s version %s listening on port %i", server->id, VERSION, server->port );
 117
 118         /* Create the initial thread. We want all threads to be created detached so
 119            their resources get freed automatically. (CY: ... hmmph...) */
 120         pthread_attr_init( &thread_attributes );
 121         pthread_attr_setdetachstate( &thread_attributes, PTHREAD_CREATE_DETACHED );
 122         pthread_attr_init( &thread_attributes );
 123         pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
 124         /* pthread_attr_setschedpolicy( &thread_attributes, SCHED_RR ); */
 125
 126         while ( !server->shutdown )
 127         {
 128                 /* Wait for a new connection. */
 129                 if ( miracle_server_wait_for_connect( server ) )
 130                 {
 131                         /* Create a new block of data to hold a copy of the incoming connection for
 132                            our server thread. The thread should free this when it terminates. */
 133
 134                         tmp = (connection_t*) malloc( sizeof(connection_t) );
 135                         tmp->parser = server->parser;
 136                         tmp->fd = accept( server->socket, (struct sockaddr*) &(tmp->sin), &socksize );
 137
 138                         /* Pass the connection to a parser thread :-/ */
 139                         if ( tmp->fd != -1 )
 140                                 pthread_create( &cmd_parse_info, &thread_attributes, parser_thread, tmp );
 141                 }
 142         }
 143
 144         miracle_log( LOG_NOTICE, "%s version %s server terminated.", server->id, VERSION );
 145
 146         return NULL;
 147 }
 148
 149 /** Execute the server thread.
 150 */
 151
 152 int miracle_server_execute( miracle_server server )
 153 {
 154         int error = 0;
 155         valerie_response response = NULL;
 156         int index = 0;
 157         struct sockaddr_in ServerAddr;
 158         int flag = 1;
 159
 160         ServerAddr.sin_family = AF_INET;
 161         ServerAddr.sin_port = htons( server->port );
 162         ServerAddr.sin_addr.s_addr = INADDR_ANY;
 163
 164         /* Create socket, and bind to port. Listen there. Backlog = 5
 165            should be sufficient for listen (). */
 166         server->socket = socket( AF_INET, SOCK_STREAM, 0 );
 167
 168         if ( server->socket == -1 )
 169         {
 170                 server->shutdown = 1;
 171                 perror( "socket" );
 172                 miracle_log( LOG_ERR, "%s unable to create socket.", server->id );
 173                 return -1;
 174         }
 175
 176     setsockopt( server->socket, SOL_SOCKET, SO_REUSEADDR, (char *)&flag, sizeof( int ) );
 177
 178         if ( bind( server->socket, (struct sockaddr *) &ServerAddr, sizeof (ServerAddr) ) != 0 )
 179         {
 180                 server->shutdown = 1;
 181                 perror( "bind" );
 182                 miracle_log( LOG_ERR, "%s unable to bind to port %d.", server->id, server->port );
 183                 return -1;
 184         }
 185
 186         if ( listen( server->socket, 5 ) != 0 )
 187         {
 188                 server->shutdown = 1;
 189                 perror( "listen" );
 190                 miracle_log( LOG_ERR, "%s unable to listen on port %d.", server->id, server->port );
 191                 return -1;
 192         }
 193
 194         fcntl( server->socket, F_SETFL, O_NONBLOCK );
 195
 196         if ( !server->proxy )
 197         {
 198                 miracle_log( LOG_NOTICE, "Starting server on %d.", server->port );
 199                 server->parser = miracle_parser_init_local( );
 200         }
 201         else
 202         {
 203                 miracle_log( LOG_NOTICE, "Starting proxy for %s:%d on %d.", server->remote_server, server->remote_port, server->port );
 204                 server->parser = valerie_parser_init_remote( server->remote_server, server->remote_port );
 205         }
 206
 207         response = valerie_parser_connect( server->parser );
 208
 209         if ( response != NULL && valerie_response_get_error_code( response ) == 100 )
 210         {
 211                 /* read configuration file */
 212                 if ( response != NULL && !server->proxy )
 213                 {
 214                         valerie_response_close( response );
 215                         response = valerie_parser_run( server->parser, "/etc/miracle.conf" );
 216
 217                         if ( valerie_response_count( response ) > 1 )
 218                         {
 219                                 if ( valerie_response_get_error_code( response ) > 299 )
 220                                         miracle_log( LOG_ERR, "Error evaluating server configuration. Processing stopped." );
 221                                 for ( index = 0; index < valerie_response_count( response ); index ++ )
 222                                         miracle_log( LOG_DEBUG, "%4d: %s", index, valerie_response_get_line( response, index ) );
 223                         }
 224                 }
 225
 226                 if ( response != NULL )
 227                 {
 228                         pthread_attr_t attr;
 229                         int result;
 230                         pthread_attr_init( &attr );
 231                         pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_JOINABLE );
 232                         pthread_attr_setinheritsched( &attr, PTHREAD_EXPLICIT_SCHED );
 233                         pthread_attr_setschedpolicy( &attr, SCHED_FIFO );
 234                         pthread_attr_setscope( &attr, PTHREAD_SCOPE_SYSTEM );
 235                         valerie_response_close( response );
 236                         result = pthread_create( &server->thread, &attr, miracle_server_run, server );
 237                         if ( result )
 238                         {
 239                                 miracle_log( LOG_WARNING, "Failed to schedule realtime (%s)", strerror(errno) );
 240                                 pthread_attr_setschedpolicy( &attr, SCHED_OTHER );
 241                                 result = pthread_create( &server->thread, &attr, miracle_server_run, server );
 242                                 if ( result )
 243                                 {
 244                                         miracle_log( LOG_CRIT, "Failed to launch TCP listener thread" );
 245                                         error = -1;
 246                                 }
 247                         }
 248                 }
 249         }
 250         else
 251         {
 252                 miracle_log( LOG_ERR, "Error connecting to parser. Processing stopped." );
 253                 server->shutdown = 1;
 254                 error = -1;
 255         }
 256
 257         return error;
 258 }
 259
 260 /** Shutdown the server.
 261 */
 262
 263 void miracle_server_shutdown( miracle_server server )
 264 {
 265         if ( server != NULL && !server->shutdown )
 266         {
 267                 server->shutdown = 1;
 268                 pthread_join( server->thread, NULL );
 269                 valerie_parser_close( server->parser );
 270                 close( server->socket );
 271         }
 272 }