Winsocket Problem beim aufrufen einer WEB Seite

/***************************************************************************

Name:          getpage.c

Autor:         www.c-worker.ch

Beschreibung:  Zeigt die Antwort des Webservers auf eine bestimmte URL an

               oder lädt wahlweise die Site in eine Datei herunter.

Return Code:   0 = ok,  >0 oder <0 = Fehler

----------------------------------------------------------------------------

Aus RFC 1945, HTTP/1.0:

Full-Response  = Status-Line

                 *( General-Header

                  | Response-Header

                  | Entity-Header )

                 CRLF   (ich gehe in diesem Code davon aus es handelt sich um \x0D\x0A\x0D\x0A)

                 [ Entity-Body ]

****************************************************************************/

#include <windows.h>

#include <winsock2.h>

#include <stdio.h>

#include <stdlib.h>

void perr_exit(char* msg, int ret_code)

{

  printf("%s, Error: ",msg);

  printf("%d\n",ret_code);

  exit(ret_code);

}

void usage(char* prgname)

{

  printf("\nUsage:\t");

  printf("%s <URL> [<File>]\n",prgname);

  printf("\tURL:  Website URL\n");

  printf("\tFile: Optional File to store the Website\n");

  exit(0);

}

int main(int argc, char** argv)

{

  char* url;

  char* site;

  char* host;

  char  buf[1024];

  char  send_buf[256];

  char  recv_buf[256];

  long  rc;

  FILE* target_file;

  char  uses_file=0;

  char* write_ptr;

  SOCKET s;

  SOCKADDR_IN addr;

  WSADATA wsa;

  HOSTENT* hent;

  if(WSAStartup(MAKEWORD(2,0),&wsa))

    perr_exit("WSAStartup failed",WSAGetLastError());

  addr.sin_family=AF_INET;

  addr.sin_port=htons(80);

  if(argc<2)

  {

    printf("\nURL: ");

    scanf("%s",buf);

    url=buf;

  }

  else

  {

    if(strcmp(argv[1],"/?")==0 ||

    strcmp(argv[1],"/help")==0 ||

    strcmp(argv[1],"/h")==0 ||

    strcmp(argv[1],"--help")==0 ||

    strcmp(argv[1],"-h")==0)

      usage(argv[0]);

    url=argv[1];

  }

  if(argc>2)

  {

    if(!(target_file=fopen(argv[2],"w")))

    {

      printf("Cannot open File ");

      perr_exit(argv[2],GetLastError());

    }

    uses_file=1;

  }

  if(strncmp("http://",url,7)==0)

    host=url+7;

  else

    host=url;

  if((site=strchr(host,'/'))!=0)

    *site++='\0';

  else

    site=host+strlen(host); /* \0 */

  printf("Host: %s\n",host);

  printf("Site: %s\n",site);

  printf("Connecting....\n");

  if((addr.sin_addr.s_addr=inet_addr(host))==INADDR_NONE)

  {

    if(!(hent=gethostbyname(host)))

      perr_exit("Cannot resolve Host",WSAGetLastError());

    strncpy((char*)&addr.sin_addr.s_addr,hent->h_addr,4);

    if(addr.sin_addr.s_addr==INADDR_NONE)

      perr_exit("Cannot resolve Host",WSAGetLastError());

  }

  if((s=socket(AF_INET,SOCK_STREAM,0))==INVALID_SOCKET)

    perr_exit("Cannot create Socket",WSAGetLastError());

  if( connect(s,(SOCKADDR*)&addr,sizeof(SOCKADDR)))

    perr_exit("Cannot connect",WSAGetLastError());

  printf("Connected to %s...\n",host);

  sprintf(send_buf,"GET /%s HTTP/1.0\r\n\r\n",site);

//  sprintf(send_buf,"GET /%s HTTP/1.0\nUser-Agent:www.google.com\n\n",site);

  if((send(s,send_buf,strlen(send_buf),0))<strlen(send_buf))

    perr_exit("Cannot send Data",WSAGetLastError());

  if(uses_file)

    printf("Downloading Page to File %s...",argv[2]);

  else

    printf("----Result----\n");

  while((rc=recv(s,recv_buf,255,0))>0)

  {

    recv_buf[rc]='\0';

    if(uses_file)

    {

      if(uses_file==1)

      {

        /* web server info nicht in Datei speichern */

        if((write_ptr=strstr(recv_buf,"\x0D\x0A\x0D\x0A"))>0)

        {

          uses_file=2;

          write_ptr+=4;

        }

      }

      else

        write_ptr=recv_buf;

      if(uses_file==2)

      {

        if( fwrite(write_ptr,1, rc-(write_ptr-recv_buf), target_file)<rc-(write_ptr-recv_buf))

          fclose(target_file);

      }

    }

    else /* uses_file */

      printf("%s",recv_buf);

  }

  printf("\nDONE!");

  if(uses_file)

    fclose(target_file);

  closesocket(s);

  return 0;

}

<H1 ALIGN="CENTER">

    Bitte benutzen sie nicht die IP Adresse des Servers, sondern immer

    www.<Wunschname>.de !!

</H1>