os-windows/1131: gethostbyname() in CGI programs always fail.

[Shlomi Fish <sh...@slink.co.il>]

>Number:         1131
>Category:       os-windows
>Synopsis:       gethostbyname() in CGI programs always fail.
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    apache (Apache HTTP Project)
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Sun Sep 14 06:30:01 1997
>Originator:     shlomi@slink.co.il
>Organization:
apache
>Release:        1.3a1
>Environment:
Windows 95 and Windows NT Workstation
Running on Pentium with at least 166 MHz.
Apache 1.3a1 compiled with Microsft Visual C++ 5.0
>Description:
When I use Apache (at least the debug version) to run CGI 
programs that call the WinSock function
gethostbyname(), I always get a NULL value returned from the function,
which indicates that an error has occured. The same program, ran from the
command line, is succesful in this function call.

On Windows 95 the return value from WSAGetLastError() is WSANO_DATA
("Valid name, no data record of requested type") and on an NT Workstation
is WSAHOST_NOT_FOUND ("Authoritative Answer: Host not found")
>How-To-Repeat:
Compile the following program using MSVC or some other Windows compiler. (you
should modify the test server-name to a nearby host). Place it somewhere in the
server's CGI scripts directory, and type it's URL in the browser.
You should receieve the following output:

C CGI script started.
Opened Winsock.
DNS Failed! WSError is 11004.

You can try to run it from a DOS box and see that everything is OK.

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

#include <stdio.h>
#include <string.h>
#include <winsock.h>

int main()
{
	/* Change it to the DNS name of an active HTTP server
	   near the testing host. */
	char szRemote[80] = "www.yahoo.com";
	unsigned short uPort = 80;
	int status;
	WSADATA WSAData;
	struct hostent * pheAddr;
	SOCKADDR_IN adrRemote;
	SOCKET sock;

	printf ("Content-Type: text/plain\n\n");

	printf ("C CGI script started.\n");
	if ((status = WSAStartup(MAKEWORD(1,1), &WSAData)) == 0)
	{
		printf("Opened Winsock.\n");
	}
	else
	{
		printf("Could not open WinSock Stack! %d is the err\n", status);
		return 0;
	}

	pheAddr = gethostbyname(szRemote);

	if (pheAddr == NULL)
	{
		printf("DNS Failed! WSError is %ld.\n", WSAGetLastError() );
		
		WSACleanup();
		return 0;
	}
	else
	{
		adrRemote.sin_family = AF_INET;
		adrRemote.sin_port = htons(uPort);
		memcpy(&(adrRemote.sin_addr), pheAddr->h_addr_list[0], 4);
		memset(&(adrRemote.sin_zero), '\0', sizeof(adrRemote.sin_zero));

		printf("DNS Succeeded! Address is %li.%li.%li.%li .\n",
			(int)adrRemote.sin_addr.S_un.S_un_b.s_b1, 
			(int)adrRemote.sin_addr.S_un.S_un_b.s_b2, 
			(int)adrRemote.sin_addr.S_un.S_un_b.s_b3,
			(int)adrRemote.sin_addr.S_un.S_un_b.s_b4);
	}

	sock = socket(PF_INET, SOCK_STREAM, 0);
	if (sock == INVALID_SOCKET)
	{
		printf("Socket allocation failed! WSError is %ld.\n", WSAGetLastError() );
		
		WSACleanup();
		return 0;
	}
	else
	{
		printf("Allocated a socket.\n");
	}

	if (connect( sock, (PSOCKADDR) &adrRemote, sizeof( adrRemote)) < 0)
	{		
		printf("connect() failed! WSError is %ld.\n", WSAGetLastError() );
        
		closesocket( sock );
		WSACleanup();
		return 0;
    }
	else
	{
		printf("Socket is connected.\n");
	}

	closesocket(sock);
	WSACleanup();

	printf( "TCP/IP test is fully successful!\n");

	return 0;
}
>Fix:
No
>Audit-Trail:
>Unformatted: