/*
 * $Id$
 *
 * Copyright (c) 2002-2011, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
 * Copyright (c) 2002-2011, Professor Benoit Macq
 * Copyright (c) 2010-2011, Kaori Hagihara
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef _WIN32
#include <windows.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#endif

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "sock_manager.h"

#ifdef SERVER
#include "fcgi_stdio.h"
#define logstream FCGI_stdout
#else
#define FCGI_stdout stdout
#define FCGI_stderr stderr
#define logstream stderr
#endif /*SERVER*/

SOCKET open_listeningsocket( int port)
{
  SOCKET listening_socket;
  struct sockaddr_in sin;
  int sock_optval = 1;
  
  listening_socket = socket(AF_INET, SOCK_STREAM, 0);
  if ( listening_socket == -1 ){
    perror("socket");
    exit(1);
  }
  
  if ( setsockopt(listening_socket, SOL_SOCKET, SO_REUSEADDR, (const char *)&sock_optval, sizeof(sock_optval)) == -1 ){
    perror("setsockopt");
    exit(1);
  }

  memset(&sin, 0, sizeof(sin));
  sin.sin_family = AF_INET;
  sin.sin_port = htons(port);
  sin.sin_addr.s_addr = htonl(INADDR_ANY);

  if ( bind(listening_socket, (struct sockaddr *)&sin, sizeof(sin)) < 0 ){
    perror("bind");
    close_socket(listening_socket);
    exit(1);
  }

  if( listen(listening_socket, SOMAXCONN) == -1){
    perror("listen");
    close_socket(listening_socket);
    exit(1);
  }
  fprintf( FCGI_stderr, "port %d is listened\n", port);

  return listening_socket;
}

SOCKET accept_socket( SOCKET listening_socket)
{
  struct sockaddr_in peer_sin;
  unsigned int addrlen = sizeof(peer_sin);

  return accept( listening_socket, (struct sockaddr *)&peer_sin, &addrlen);
}

void send_stream( SOCKET connected_socket, void *stream, int length)
{
  char *ptr = (char*)stream;
  int remlen = length;

  while( remlen > 0){
    int sentlen = send( connected_socket, ptr, remlen, 0);
    if( sentlen == -1){
      fprintf( FCGI_stderr, "sending stream error\n");
      break;
    }
    remlen = remlen - sentlen;
    ptr = ptr + sentlen;
  }
}

void * receive_stream( SOCKET connected_socket, int length)
{
  char *stream, *ptr;
  int remlen, redlen;

  ptr = stream = malloc( length);
  remlen = length;

  while( remlen > 0){
    redlen = recv( connected_socket, ptr, remlen, 0);
    if( redlen == -1){
      fprintf( FCGI_stderr, "receive stream error\n");
      free( stream);
      stream = NULL;
      break;
    }
    remlen -= redlen;
    ptr = ptr + redlen;
  }
  return stream;
}

int receive_line(SOCKET connected_socket, char *p)
{
  int len = 0;
  while (1){
    int ret;
    ret = recv( connected_socket, p, 1, 0);
    if ( ret == -1 ){
      perror("receive");
      exit(1);
    } else if ( ret == 0 ){
      break;
    }
    if ( *p == '\n' )
      break;
    p++;
    len++;
  }
  *p = '\0';

  if( len == 0)
    fprintf( FCGI_stderr, "Header receive error\n");

  return len;
}

char * receive_string( SOCKET connected_socket)
{
  char buf[BUF_LEN];
  
  receive_line( connected_socket, buf);
    
  return strdup(buf);
}

int close_socket( SOCKET sock)
{
#ifdef _WIN32
  return closesocket( sock);
#else
  return close( sock);
#endif
}