From: Phil Thompson <phil@river-bank.demon.co.uk>

I've completed the patch to fix the protocol and authentication issues I
was discussing a couple of weeks ago.  The particular changes are:

- the protocol has a version number
- network byte order is used throughout
- the pg_hba.conf file is used to specify what method is used to
  authenticate a frontend (either password, ident, trust, reject, krb4
  or krb5)
- support for multiplexed backends is removed
- appropriate changes to man pages
- the -a switch to many programs to specify an authentication service
  no longer has any effect
- the libpq.so version number has changed to 1.1

The new backend still supports the old protocol so old interfaces won't
break.

src/interfaces/libpq/fe-exec.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-exec.c,v 1.45 1997/12/23 20:00:06 thomas Exp $
+ *	  $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-exec.c,v 1.46 1998/01/26 01:42:35 scrappy Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -168,7 +168,7 @@ getTuple(PGconn *conn, PGresult *result, int binary)
 	if ((nfields % BYTELEN) > 0)
 		nbytes++;
 
-	if (pqGetnchar(bitmap, nbytes, pfin, pfdebug) == 1)
+	if (nbytes >= MAX_FIELDS || pqGetnchar(bitmap, nbytes, pfin, pfdebug) == 1)
 	{
 		sprintf(conn->errorMessage,
 			  "Error reading null-values bitmap from row data stream\n");
@@ -189,10 +189,10 @@ getTuple(PGconn *conn, PGresult *result, int binary)
 		else
 		{
 			/* get the value length (the first four bytes are for length) */
-			pqGetInt(&vlen, VARHDRSZ, pfin, pfdebug);
+			pqGetInt(&vlen, 4, pfin, pfdebug);
 			if (binary == 0)
 			{
-				vlen = vlen - VARHDRSZ;
+				vlen = vlen - 4;
 			}
 			if (vlen < 0)
 				vlen = 0;