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  1. /*
  2.  * Copyright (c) 2009 Lukas Mejdrech
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup socket
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  \todo
  35.  */
  36.  
  37. #include "../err.h"
  38.  
  39. #include "../include/in.h"
  40. #include "../include/inet.h"
  41.  
  42. #include "../include/socket.h"
  43. #include "../include/socket_errno.h"
  44.  
  45. #include "../structures/dynamic_fifo.h"
  46. #include "../structures/int_map.h"
  47. #include "../structures/packet/packet.h"
  48. #include "../structures/packet/packet_client.h"
  49.  
  50. #include "socket_core.h"
  51.  
  52. int socket_bind_insert( socket_ports_ref global_sockets, socket_core_ref socket, int port );
  53.  
  54. INT_MAP_IMPLEMENT( socket_cores, socket_core_t );
  55.  
  56. INT_MAP_IMPLEMENT( socket_ports, socket_core_ref );
  57.  
  58. int socket_bind( socket_cores_ref local_sockets, socket_ports_ref global_sockets, int socket_id, void * addr, size_t addrlen, int free_ports_start, int free_ports_end, int last_used_port ){
  59.     socket_core_ref         socket;
  60.     socket_core_ref *       socket_pointer;
  61.     struct sockaddr *       address;
  62.     struct sockaddr_in *    address_in;
  63.  
  64.     if( addrlen < sizeof( struct sockaddr )) return EINVAL;
  65.     address = ( struct sockaddr * ) addr;
  66.     switch( address->sa_family ){
  67.         case AF_INET:
  68.             if( addrlen != sizeof( struct sockaddr_in )) return EINVAL;
  69.             address_in = ( struct sockaddr_in * ) addr;
  70.             // find the socket
  71.             socket = socket_cores_find( local_sockets, socket_id );
  72.             if( ! socket ) return ENOTSOCK;
  73.             // bind a free port?
  74.             if( address_in->sin_port <= 0 ){
  75.                 return socket_bind_free_port( global_sockets, socket, free_ports_start, free_ports_end, last_used_port );
  76.             }
  77.             // try to find the port
  78.             socket_pointer = socket_ports_find( global_sockets, address_in->sin_port );
  79.             if( socket_pointer ){
  80.                 // already used
  81.                 return EADDRINUSE;
  82.             }
  83.             // disbind if bound
  84.             socket_ports_exclude( global_sockets, socket->port );
  85.             socket->port = -1;
  86.             return socket_bind_insert( global_sockets, socket, address_in->sin_port );
  87.             break;
  88.         // TODO IPv6
  89.         default:
  90.             return EAFNOSUPPORT;
  91.     }
  92.     return EOK;
  93. }
  94.  
  95. int socket_bind_free_port( socket_ports_ref global_sockets, socket_core_ref socket, int free_ports_start, int free_ports_end, int last_used_port ){
  96.     int index;
  97.  
  98.     // from the last used one
  99.     index = last_used_port;
  100.     do{
  101.         ++ index;
  102.         // til the range end
  103.         if( index >= free_ports_end ){
  104.             // start from the range beginning
  105.             index = free_ports_start - 1;
  106.             do{
  107.                 ++ index;
  108.                 // til the last used one
  109.                 if( index >= last_used_port ){
  110.                     // none found
  111.                     return ENOTCONN;
  112.                 }
  113.             }while( socket_ports_find( global_sockets, index ) != NULL );
  114.             // found, break immediately
  115.             break;
  116.         }
  117.     }while( socket_ports_find( global_sockets, index ) != NULL );
  118.     return socket_bind_insert( global_sockets, socket, index );
  119. }
  120.  
  121. int socket_bind_insert( socket_ports_ref global_sockets, socket_core_ref socket, int port ){
  122.     ERROR_DECLARE;
  123.  
  124.     socket_core_ref *   socket_pointer;
  125.  
  126.     // create a wrapper
  127.     socket_pointer = ( socket_core_ref * ) malloc( sizeof( socket_core_ref ));
  128.     if( ! socket_pointer ) return ENOMEM;
  129.     * socket_pointer = socket;
  130.     // register the incomming port
  131.     ERROR_CODE = socket_ports_add( global_sockets, port, socket_pointer );
  132.     if( ERROR_CODE < 0 ){
  133.         free( socket_pointer );
  134.         return ERROR_CODE;
  135.     }
  136.     socket->port = port;
  137.     return EOK;
  138. }
  139.  
  140. int socket_create( socket_cores_ref local_sockets, int app_phone, int * socket_id ){
  141.     ERROR_DECLARE;
  142.  
  143.     socket_core_ref socket;
  144.     int             res;
  145.  
  146.     if( ! socket_id ) return EBADMEM;
  147.     socket = ( socket_core_ref ) malloc( sizeof( * socket ));
  148.     if( ! socket ) return ENOMEM;
  149.     // initialize
  150.     socket->phone = app_phone;
  151.     socket->port = -1;
  152.     socket->device_id = -1;
  153.     socket->peer_addr = NULL;
  154.     if( ERROR_OCCURRED( dyn_fifo_initialize( & socket->received, SOCKET_INITIAL_RECEIVED_SIZE ))){
  155.         free( socket );
  156.         return ERROR_CODE;
  157.     }
  158.     if( ERROR_OCCURRED( dyn_fifo_initialize( & socket->accepted, SOCKET_INITIAL_ACCEPTED_SIZE ))){
  159.         dyn_fifo_destroy( & socket->received );
  160.         free( socket );
  161.         return ERROR_CODE;
  162.     }
  163.     // get a next free socket number
  164.     socket->socket_id = socket_cores_count( local_sockets ) + 1;
  165.     // store the socket
  166.     res = socket_cores_add( local_sockets, socket->socket_id, socket );
  167.     if( res < 0 ){
  168.         dyn_fifo_destroy( & socket->received );
  169.         dyn_fifo_destroy( & socket->accepted );
  170.         free( socket );
  171.         return res;
  172.     }
  173.     // return the socket identifier
  174.     * socket_id = socket->socket_id;
  175.     return EOK;
  176. }
  177.  
  178. int socket_destroy( int packet_phone, int socket_id, socket_cores_ref local_sockets, socket_ports_ref global_sockets ){
  179.     socket_core_ref socket;
  180.     int             accepted_id;
  181.     int             packet_id;
  182.  
  183.     // find the socket
  184.     socket = socket_cores_find( local_sockets, socket_id );
  185.     if( ! socket ) return ENOTSOCK;
  186.     socket_ports_exclude( global_sockets, socket->port );
  187.     // destroy all accepted sockets
  188.     while(( accepted_id = dyn_fifo_pop( & socket->accepted )) >= 0 ){
  189.         socket_destroy( packet_phone, accepted_id, local_sockets, global_sockets );
  190.     }
  191.     // release all received packets
  192.     while(( packet_id = dyn_fifo_pop( & socket->received )) >= 0 ){
  193.         pq_release( packet_phone, packet_id );
  194.     }
  195.     dyn_fifo_destroy( & socket->received );
  196.     dyn_fifo_destroy( & socket->accepted );
  197.     socket_cores_exclude( local_sockets, socket_id );
  198.     return EOK;
  199. }
  200.  
  201. /** @}
  202.  */
  203.