research.m1stereo.tv/gitweb/ - melted/blob - src/valerie/valerie_socket.c

   1 /*
   2  * valerie_socket.c -- Client Socket
   3  * Copyright (C) 2002-2003 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include <config.h>
  23 #endif
  24
  25 /* System header files */
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <netdb.h>
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33 #include <fcntl.h>
  34 #include <errno.h>
  35 #include <netinet/in.h>
  36 #include <sys/time.h>
  37
  38 /* Application header files */
  39 #include "valerie_socket.h"
  40
  41 /** Initialise the socket.
  42 */
  43
  44 valerie_socket valerie_socket_init( char *server, int port )
  45 {
  46         valerie_socket socket = malloc( sizeof( valerie_socket_t ) );
  47         if ( socket != NULL )
  48         {
  49                 memset( socket, 0, sizeof( valerie_socket_t ) );
  50                 socket->fd = -1;
  51                 socket->server = strdup( server );
  52                 socket->port = port;
  53         }
  54         return socket;
  55 }
  56
  57 /** Connect to the server.
  58 */
  59
  60 int valerie_socket_connect( valerie_socket connection )
  61 {
  62         int ret = 0;
  63     struct hostent *host;
  64     struct sockaddr_in sock;
  65
  66         if ( connection->server != NULL )
  67         {
  68                 host = gethostbyname( connection->server );
  69
  70                 memset( &sock, 0, sizeof( struct sockaddr_in ) );
  71                 memcpy( &sock.sin_addr, host->h_addr, host->h_length );
  72                 sock.sin_family = host->h_addrtype;
  73                 sock.sin_port = htons( connection->port );
  74
  75                 if ( ( connection->fd = socket( AF_INET, SOCK_STREAM, 0 ) ) != -1 )
  76                         ret = connect( connection->fd, (const struct sockaddr *)&sock, sizeof( struct sockaddr_in ) );
  77                 else
  78                         ret = -1;
  79         }
  80
  81         return ret;
  82 }
  83
  84 /** Convenience constructor for a connected file descriptor.
  85 */
  86
  87 valerie_socket valerie_socket_init_fd( int fd )
  88 {
  89         valerie_socket socket = malloc( sizeof( valerie_socket_t ) );
  90         if ( socket != NULL )
  91         {
  92                 memset( socket, 0, sizeof( valerie_socket_t ) );
  93                 socket->fd = fd;
  94                 socket->no_close = 1;
  95         }
  96         return socket;
  97 }
  98
  99 /** Read an arbitrarily formatted block of data from the server.
 100 */
 101
 102 int valerie_socket_read_data( valerie_socket socket, char *data, int length )
 103 {
 104     struct timeval tv = { 1, 0 };
 105     fd_set rfds;
 106         int used = 0;
 107
 108         data[ 0 ] = '\0';
 109
 110     FD_ZERO( &rfds );
 111     FD_SET( socket->fd, &rfds );
 112
 113         if ( select( socket->fd + 1, &rfds, NULL, NULL, &tv ) )
 114         {
 115                 used = read( socket->fd, data, length - 1 );
 116                 if ( used > 0 )
 117                         data[ used ] = '\0';
 118                 else
 119                         used = -1;
 120         }
 121
 122         return used;
 123 }
 124
 125 /** Write an arbitrarily formatted block of data to the server.
 126 */
 127
 128 int valerie_socket_write_data( valerie_socket socket, const char *data, int length )
 129 {
 130         int used = 0;
 131
 132         while ( used >=0 && used < length )
 133         {
 134                 struct timeval tv = { 1, 0 };
 135                 fd_set rfds;
 136                 fd_set wfds;
 137                 fd_set efds;
 138
 139                 FD_ZERO( &rfds );
 140                 FD_SET( socket->fd, &rfds );
 141                 FD_ZERO( &wfds );
 142                 FD_SET( socket->fd, &wfds );
 143                 FD_ZERO( &efds );
 144                 FD_SET( socket->fd, &efds );
 145
 146                 errno = 0;
 147
 148                 if ( select( socket->fd + 1, &rfds, &wfds, &efds, &tv ) )
 149                 {
 150                         if ( errno != 0 || FD_ISSET( socket->fd, &efds ) || FD_ISSET( socket->fd, &rfds ) )
 151                         {
 152                                 used = -1;
 153                         }
 154                         else if ( FD_ISSET( socket->fd, &wfds ) )
 155                         {
 156                                 int inc = write( socket->fd, data + used, length - used );
 157                                 if ( inc > 0 )
 158                                         used += inc;
 159                                 else
 160                                         used = -1;
 161                         }
 162                 }
 163         }
 164
 165         return used;
 166 }
 167
 168 /** Close the socket.
 169 */
 170
 171 void valerie_socket_close( valerie_socket socket )
 172 {
 173         if ( socket->fd > 0 && !socket->no_close )
 174                 close( socket->fd );
 175         free( socket->server );
 176         free( socket );
 177 }