sslug-teknik team mailing list archive

[Hans Christian Studt <hcstudt@xxxxxxxxxxxxxx>]

Hans Christian Studt wrote:
> Hej,
>
> Mit problem er at nogle URL'er referere til nogle PDF filer som jeg ikke 
> umiddelbart er interesseret i at hente, så jeg kunne godt tænke mig blot 
> at smage på URL'ens indhold. Blot tilstrækkeligt til at "file" kan 
> bestemme data typen.
>
> Er der en måde at begrænse længden af det der hentes til f.eks 256 
> bytes, for så at afgøre om man virkelig er interesseret i URL'en ?

------ http-head.c --------- fra www-linuxsocket.org ------------
/* http-client.c
 *
 * Copyright (c) 2000 Sean Walton and Macmillan Publishers.  Use may be in
 * whole or in part in accordance to the General Public License (GPL).
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/

/*****************************************************************************/
/*** http-client.c 
   ***/
/*** 
   ***/
/*** This program shows what the HTTP server sends to the client. 
First,  ***/
/*** it opens a TCP socket to the server.  Then, it sends the request 
   ***/
/*** "GET <resource> HTTP/1.0\n\n" (the second newline is needed for the 
  ***/
/*** "message-end" message.  Lastly it prints out the reply. 
   ***/
/*****************************************************************************/

#include <stdarg.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <resolv.h>
#include <errno.h>

#define MAXBUF  1024
void PANIC(char *msg);
#define PANIC(msg)  {perror(msg); abort();}

void TRACE(char *msg);
#define TRACE(msg)  {printf("%s\n",msg);}

int main(int Count, char *Strings[])
{   int sockfd, bytes_read;
    struct sockaddr_in dest;
    char buffer[MAXBUF];
    int Rc;
    char ErrTxt[256];

TRACE("# 20000");
    /*---Make sure we have the right number of parameters---*/
    if ( Count != 3 )
        {
        PANIC("usage: testport <IP-addr> <send-msg>\n");
        }
TRACE("# 21000");
sprintf(ErrTxt, "# 20100 Strings[1] = '%s'", Strings[1]);
TRACE(ErrTxt);
sprintf(ErrTxt, "# 20200 Strings[2] = '%s'", Strings[2]);
TRACE(ErrTxt);
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
TRACE("# 21200");
    if ( sockfd < 0 )
        {
        PANIC("Socket");
        }
TRACE("# 21300");

    /*---Initialize server address/port struct---*/
    bzero(&dest, sizeof(dest));
    dest.sin_family = AF_INET;
    dest.sin_port = htons(80); /*default HTTP Server port */
    Rc = inet_addr(Strings[1], &dest.sin_addr.s_addr);
TRACE("# 21400");
    if ( Rc == 0 )
        {
        PANIC(Strings[1]);
        }
TRACE("# 21500");

    /*---Connect to server---*/
TRACE("# 21600");
    Rc = connect(sockfd, (struct sockaddr*)&dest, sizeof(dest));
TRACE("# 21700");
    if ( Rc != 0 )
        {
        sprintf(ErrTxt, "Connect error code '%d'", Rc );
        PANIC(ErrTxt);
        }
TRACE("# 21800");

    sprintf(buffer, "HEAD %s HTTP/1.0\n\n", Strings[2]);
TRACE("# 21900");
    send(sockfd, buffer, strlen(buffer), 0);
TRACE("# 22000");

    /*---While there's data, read and print it---*/
    do
        {
        bzero(buffer, sizeof(buffer));
        bytes_read = recv(sockfd, buffer, sizeof(buffer), 0);
        if ( bytes_read > 0 )
            {
            printf("%s", buffer);
            }
        }
    while ( bytes_read > 0 );

    /*---Clean up---*/
    close(sockfd);
    return 0;
}
-------------------------------------------

-------------------------------------------
(/user/w3c/http) #./helsinge-2.sh
++ ./http-head 193.88.113.181 
'/nethotel-include/WoBilag.dll?InfoId=1271474&amp;BilagId=116022'
# 20000
# 21000
# 20100 Strings[1] = '193.88.113.181'
# 20200 Strings[2] = 
'/nethotel-include/WoBilag.dll?InfoId=1271474&amp;BilagId=116022'
# 21200
# 21300
# 21400
# 21500
# 21600
# 21700
Connect error code '-1': Connection refused
./helsinge-2.sh: line 2: 25879 Afbrudt (SIGABRT)       (core dumped) 
./http-head 193.88.113.181 
'/nethotel-include/WoBilag.dll?InfoId=1271474&amp;BilagId=116022'
-------------------------------------------

Hvad mon der går galt ?
--
Hans Christian Studt  mailto:hc@xxxxxxxx  http://hc.studt.dk
Free Software is the carrot. Microsoft is the stick.
Linux information
http://linux.studt.dk
.dk og W3C : http://home13.inet.tele.dk/hcstudt/w3c/index.html