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/include/libpq/crypt.h

@@ -9,7 +9,7 @@
 #ifndef PG_CRYPT_H
 #define PG_CRYPT_H
 
-#include <libpq/pqcomm.h>
+#include <libpq/libpq-be.h>
 
 #define CRYPT_PWD_FILE	"pg_pwd"
 #define CRYPT_PWD_FILE_SEPCHAR	"'\\t'"
@@ -21,7 +21,9 @@ extern int        pwd_cache_count;
 
 extern char* crypt_getpwdfilename(void);
 extern char* crypt_getpwdreloadfilename(void);
+#ifdef 0
 extern MsgType crypt_salt(const char* user);
+#endif
 extern int crypt_verify(Port* port, const char* user, const char* pgpass);
 
 #endif