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-auth.h

@@ -6,13 +6,16 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: fe-auth.h,v 1.6 1997/09/08 21:55:35 momjian Exp $
+ * $Id: fe-auth.h,v 1.7 1998/01/26 01:42:26 scrappy Exp $
  *
  *-------------------------------------------------------------------------
  */
 #ifndef FE_AUTH_H
 #define FE_AUTH_H
 
+#include "libpq-fe.h"
+
+
 /*----------------------------------------------------------------
  * Common routines and definitions
  *----------------------------------------------------------------
@@ -29,9 +32,8 @@
 #endif							/* KRB4 || KRB5 */
 
 extern int
-fe_sendauth(MsgType msgtype, Port *port, const char *hostname,
-			const char *user, const char *password,
-			const char *PQerromsg);
+fe_sendauth(AuthRequest areq, PGconn *conn, const char *hostname,
+			const char *password, const char *PQerromsg);
 extern void fe_setauthsvc(const char *name, char *PQerrormsg);
 
 #define PG_KRB4_VERSION "PGVER4.1"		/* at most KRB_SENDAUTH_VLEN chars */