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
  36 /* Application header files */
  37 #include "valerie_socket.h"
  38
  39 /** Initialise the socket.
  40 */
  41
  42 valerie_socket valerie_socket_init( char *server, int port )
  43 {
  44         valerie_socket socket = malloc( sizeof( valerie_socket_t ) );
  45         if ( socket != NULL )
  46         {
  47                 memset( socket, 0, sizeof( valerie_socket_t ) );
  48                 socket->fd = -1;
  49                 socket->server = strdup( server );
  50                 socket->port = port;
  51         }
  52         return socket;
  53 }
  54
  55 /** Connect to the server.
  56 */
  57
  58 int valerie_socket_connect( valerie_socket connection )
  59 {
  60         int ret = 0;
  61     struct hostent *host;
  62     struct sockaddr_in sock;
  63
  64         if ( connection->server != NULL )
  65         {
  66                 host = gethostbyname( connection->server );
  67
  68                 memset( &sock, 0, sizeof( struct sockaddr_in ) );
  69                 memcpy( &sock.sin_addr, host->h_addr, host->h_length );
  70                 sock.sin_family = host->h_addrtype;
  71                 sock.sin_port = htons( connection->port );
  72
  73                 if ( ( connection->fd = socket( AF_INET, SOCK_STREAM, 0 ) ) != -1 )
  74                         ret = connect( connection->fd, (const struct sockaddr *)&sock, sizeof( struct sockaddr_in ) );
  75                 else
  76                         ret = -1;
  77         }
  78
  79         return ret;
  80 }
  81
  82 /** Convenience constructor for a connected file descriptor.
  83 */
  84
  85 valerie_socket valerie_socket_init_fd( int fd )
  86 {
  87         valerie_socket socket = malloc( sizeof( valerie_socket_t ) );
  88         if ( socket != NULL )
  89         {
  90                 memset( socket, 0, sizeof( valerie_socket_t ) );
  91                 socket->fd = fd;
  92                 socket->no_close = 1;
  93         }
  94         return socket;
  95 }
  96
  97 /** Read an arbitrarily formatted block of data from the server.
  98 */
  99
 100 int valerie_socket_read_data( valerie_socket socket, char *data, int length )
 101 {
 102     struct timeval tv = { 1, 0 };
 103     fd_set rfds;
 104         int used = 0;
 105
 106         data[ 0 ] = '\0';
 107
 108     FD_ZERO( &rfds );
 109     FD_SET( socket->fd, &rfds );
 110
 111         if ( select( socket->fd + 1, &rfds, NULL, NULL, &tv ) )
 112         {
 113                 used = read( socket->fd, data, length - 1 );
 114                 if ( used > 0 )
 115                         data[ used ] = '\0';
 116                 else
 117                         used = -1;
 118         }
 119
 120         return used;
 121 }
 122
 123 /** Write an arbitrarily formatted block of data to the server.
 124 */
 125
 126 int valerie_socket_write_data( valerie_socket socket, char *data, int length )
 127 {
 128         int used = 0;
 129
 130         while ( used >=0 && used < length )
 131         {
 132                 struct timeval tv = { 1, 0 };
 133                 fd_set rfds;
 134                 fd_set wfds;
 135                 fd_set efds;
 136
 137                 FD_ZERO( &rfds );
 138                 FD_SET( socket->fd, &rfds );
 139                 FD_ZERO( &wfds );
 140                 FD_SET( socket->fd, &wfds );
 141                 FD_ZERO( &efds );
 142                 FD_SET( socket->fd, &efds );
 143
 144                 errno = 0;
 145
 146                 if ( select( socket->fd + 1, &rfds, &wfds, &efds, &tv ) )
 147                 {
 148                         if ( errno != 0 || FD_ISSET( socket->fd, &efds ) || FD_ISSET( socket->fd, &rfds ) )
 149                         {
 150                                 used = -1;
 151                         }
 152                         else if ( FD_ISSET( socket->fd, &wfds ) )
 153                         {
 154                                 int inc = write( socket->fd, data + used, length - used );
 155                                 if ( inc > 0 )
 156                                         used += inc;
 157                                 else
 158                                         used = -1;
 159                         }
 160                 }
 161         }
 162
 163         return used;
 164 }
 165
 166 /** Close the socket.
 167 */
 168
 169 void valerie_socket_close( valerie_socket socket )
 170 {
 171         if ( socket->fd > 0 && !socket->no_close )
 172                 close( socket->fd );
 173         free( socket->server );
 174         free( socket );
 175 }