//================================================================
//  browser.cc
//  ¸¶»Ï web browser
//  Copyright (C) Naoki Watanabe. 1999. All rights reserved.
//================================================================

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

int main( int argc, char* argv[] )
{
  u_short port = 80;
  char hostname[256], pathname[256];

    // parse the URL.
  if( 2 != argc || (
      3 != sscanf( argv[1], "http://%[^:]:%hu%s", hostname, &port, pathname ) &&
      2 != sscanf( argv[1], "http://%[^/]%s", hostname, pathname ) ) ){
    fprintf( stderr, "Usage: browser http://hostname:port/pathname\n" );
    exit(1);
  }

    // get the IP address of the web server.
  struct hostent* hp;
  if( (hp = gethostbyname( hostname )) == NULL ){
    fprintf( stderr, "gethostbyname\n");
    exit(1);
  }

    // get the address of the internet domain socket to the HTTPD.
  struct sockaddr_in sadd;
  sadd.sin_family = AF_INET;
  sadd.sin_port   = htons(port);
  sadd.sin_addr   = *(struct in_addr*) hp->h_addr;

    // create a new socket.
  int s = socket( AF_INET, SOCK_STREAM, 0 );

    // connect the socket to the httpd.
  if( connect( s, (sockaddr*)&sadd, sizeof(sockaddr_in) ) < 0 ){
    perror("connect");
    exit(1);
  }

  size_t len;
  char   buf[4096];

    // send a request to the httpd.
  len = sprintf( buf, "GET %s\r\n", pathname );
  send( s, buf, len, 0 );

    // reveive contents and output them.
  while( (len=recv( s, buf, sizeof(buf), 0 ))>0 ) write( 1, buf, len );

  shutdown( s, 2 );

  return 0;
}