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
  37 /* Application header files */
  38 #include "valerie_socket.h"
  39
  40 /** Initialise the socket.
  41 */
  42
  43 valerie_socket valerie_socket_init( char *server, int port )
  44 {
  45         valerie_socket socket = malloc( sizeof( valerie_socket_t ) );
  46         if ( socket != NULL )
  47         {
  48                 memset( socket, 0, sizeof( valerie_socket_t ) );
  49                 socket->fd = -1;
  50                 socket->server = strdup( server );
  51                 socket->port = port;
  52         }
  53         return socket;
  54 }
  55
  56 /** Connect to the server.
  57 */
  58
  59 int valerie_socket_connect( valerie_socket connection )
  60 {
  61         int ret = 0;
  62     struct hostent *host;
  63     struct sockaddr_in sock;
  64
  65         if ( connection->server != NULL )
  66         {
  67                 host = gethostbyname( connection->server );
  68
  69                 memset( &sock, 0, sizeof( struct sockaddr_in ) );
  70                 memcpy( &sock.sin_addr, host->h_addr, host->h_length );
  71                 sock.sin_family = host->h_addrtype;
  72                 sock.sin_port = htons( connection->port );
  73
  74                 if ( ( connection->fd = socket( AF_INET, SOCK_STREAM, 0 ) ) != -1 )
  75                         ret = connect( connection->fd, (const struct sockaddr *)&sock, sizeof( struct sockaddr_in ) );
  76                 else
  77                         ret = -1;
  78         }
  79
  80         return ret;
  81 }
  82
  83 /** Convenience constructor for a connected file descriptor.
  84 */
  85
  86 valerie_socket valerie_socket_init_fd( int fd )
  87 {
  88         valerie_socket socket = malloc( sizeof( valerie_socket_t ) );
  89         if ( socket != NULL )
  90         {
  91                 memset( socket, 0, sizeof( valerie_socket_t ) );
  92                 socket->fd = fd;
  93                 socket->no_close = 1;
  94         }
  95         return socket;
  96 }
  97
  98 /** Read an arbitrarily formatted block of data from the server.
  99 */
 100
 101 int valerie_socket_read_data( valerie_socket socket, char *data, int length )
 102 {
 103     struct timeval tv = { 1, 0 };
 104     fd_set rfds;
 105         int used = 0;
 106
 107         data[ 0 ] = '\0';
 108
 109     FD_ZERO( &rfds );
 110     FD_SET( socket->fd, &rfds );
 111
 112         if ( select( socket->fd + 1, &rfds, NULL, NULL, &tv ) )
 113         {
 114                 used = read( socket->fd, data, length - 1 );
 115                 if ( used > 0 )
 116                         data[ used ] = '\0';
 117                 else
 118                         used = -1;
 119         }
 120
 121         return used;
 122 }
 123
 124 /** Write an arbitrarily formatted block of data to the server.
 125 */
 126
 127 int valerie_socket_write_data( valerie_socket socket, char *data, int length )
 128 {
 129         int used = 0;
 130
 131         while ( used >=0 && used < length )
 132         {
 133                 struct timeval tv = { 1, 0 };
 134                 fd_set rfds;
 135                 fd_set wfds;
 136                 fd_set efds;
 137
 138                 FD_ZERO( &rfds );
 139                 FD_SET( socket->fd, &rfds );
 140                 FD_ZERO( &wfds );
 141                 FD_SET( socket->fd, &wfds );
 142                 FD_ZERO( &efds );
 143                 FD_SET( socket->fd, &efds );
 144
 145                 errno = 0;
 146
 147                 if ( select( socket->fd + 1, &rfds, &wfds, &efds, &tv ) )
 148                 {
 149                         if ( errno != 0 || FD_ISSET( socket->fd, &efds ) || FD_ISSET( socket->fd, &rfds ) )
 150                         {
 151                                 used = -1;
 152                         }
 153                         else if ( FD_ISSET( socket->fd, &wfds ) )
 154                         {
 155                                 int inc = write( socket->fd, data + used, length - used );
 156                                 if ( inc > 0 )
 157                                         used += inc;
 158                                 else
 159                                         used = -1;
 160                         }
 161                 }
 162         }
 163
 164         return used;
 165 }
 166
 167 /** Close the socket.
 168 */
 169
 170 void valerie_socket_close( valerie_socket socket )
 171 {
 172         if ( socket->fd > 0 && !socket->no_close )
 173                 close( socket->fd );
 174         free( socket->server );
 175         free( socket );
 176 }