--- /dev/null
+diff -uNr exim-3.31/exim-texinfo-3.30/doc/spec.texinfo exim-3.31-whoson/exim-texinfo-3.30/doc/spec.texinfo
+--- exim-3.31/exim-texinfo-3.30/doc/spec.texinfo Thu Jul 19 18:41:19 2001
++++ exim-3.31-whoson/exim-texinfo-3.30/doc/spec.texinfo Thu Jul 19 18:40:46 2001
+@@ -3586,6 +3586,7 @@
+
+ LOOKUP_DBM=yes
+ LOOKUP_LSEARCH=yes
++LOOKUP_WHOSON=yes
+ @end example
+
+ which means that only linear searching and DBM lookups are included by default.
+@@ -3758,6 +3759,17 @@
+ "More about dnsdb" below.
+
+ @item
++@dfn{whoson}: This is the lookup type that performs lookups for relay allowed
++dialups using WHOSON (pop before smtp) service. You have to give it an IP
++address of host in question. It returns username associated in WHOSON database
++with queried IP address, or nothing, if given IP is unknown. Primary use is:
++
++@example
++
++host_relay_accept = localhost : net-whoson;$key
++@end example
++
++@item
+ @dfn{testdb}: This is a lookup type which is for use in debugging Exim. It is
+ not likely to be useful in normal operation.
+ @end itemize
+diff -uNr exim-3.31/scripts/MakeLinks exim-3.31-whoson/scripts/MakeLinks
+--- exim-3.31/scripts/MakeLinks Mon Jul 2 11:46:41 2001
++++ exim-3.31-whoson/scripts/MakeLinks Thu Jul 19 18:28:52 2001
+@@ -79,6 +79,8 @@
+ ln -s ../../src/lookups/pgsql.c pgsql.c
+ ln -s ../../src/lookups/testdb.h testdb.h
+ ln -s ../../src/lookups/testdb.c testdb.c
++ln -s ../../src/lookups/whoson.h whoson.h
++ln -s ../../src/lookups/whoson.c whoson.c
+ cd ..
+
+ # Likewise for the code for the directors
+diff -uNr exim-3.31/src/EDITME exim-3.31-whoson/src/EDITME
+--- exim-3.31/src/EDITME Thu Jul 19 18:41:19 2001
++++ exim-3.31-whoson/src/EDITME Thu Jul 19 18:28:52 2001
+@@ -578,3 +578,5 @@
+ # USE_TCP_WRAPPERS=yes
+
+ # End of EDITME
++
++LOOKUP_WHOSON=yes
+diff -uNr exim-3.31/src/config.h.defaults exim-3.31-whoson/src/config.h.defaults
+--- exim-3.31/src/config.h.defaults Mon Jul 2 11:46:41 2001
++++ exim-3.31-whoson/src/config.h.defaults Thu Jul 19 18:28:52 2001
+@@ -106,3 +106,5 @@
+ #define ROOT_UID 0
+
+ /* End of config.h.defaults */
++
++#define LOOKUP_WHOSON
+diff -uNr exim-3.31/src/drtables.c exim-3.31-whoson/src/drtables.c
+--- exim-3.31/src/drtables.c Mon Jul 2 11:46:42 2001
++++ exim-3.31-whoson/src/drtables.c Thu Jul 19 18:28:52 2001
+@@ -75,6 +75,10 @@
+ #include "lookups/testdb.h"
+ #endif
+
++#ifdef LOOKUP_WHOSON
++#include "lookups/whoson.h"
++#endif
++
+
+ /* The second field in each item below is a set of bit flags:
+
+@@ -325,6 +329,19 @@
+ NULL, /* no close function */
+ NULL, /* no tidy function */
+ NULL /* no quoting function */
++ },
++#endif
++
++#ifdef LOOKUP_WHOSON
++ {
++ "whoson", /* lookup name */
++ lookup_querystyle, /* query-style lookup */
++ whoson_open, /* open function */
++ NULL, /* check function */
++ whoson_find, /* find function */
++ NULL, /* no close function */
++ NULL, /* no tidy function */
++ NULL /* no quoting function */
+ },
+ #endif
+
+diff -uNr exim-3.31/src/lookups/Makefile exim-3.31-whoson/src/lookups/Makefile
+--- exim-3.31/src/lookups/Makefile Mon Jul 2 11:46:43 2001
++++ exim-3.31-whoson/src/lookups/Makefile Thu Jul 19 18:28:52 2001
+@@ -4,7 +4,7 @@
+ # defined, dummy modules get compiled.
+
+ OBJ = cdb.o dbmdb.o dnsdb.o ldap.o lsearch.o mysql.o nis.o nisplus.o pgsql.o \
+- testdb.o
++ testdb.o whoson.o
+
+ lookups.a: $(OBJ)
+ /bin/rm -f lookups.a
+@@ -25,5 +25,6 @@
+ nisplus.o: $(HDRS) nisplus.c nisplus.h
+ pgsql.o: $(HDRS) pgsql.c pgsql.h
+ testdb.o: $(HDRS) testdb.c testdb.h
++whoson.o: $(HDRS) whoson.c whoson.h
+
+ # End
+diff -uNr exim-3.31/src/lookups/whoson.c exim-3.31-whoson/src/lookups/whoson.c
+--- exim-3.31/src/lookups/whoson.c Thu Jan 1 01:00:00 1970
++++ exim-3.31-whoson/src/lookups/whoson.c Thu Jul 19 18:28:52 2001
+@@ -0,0 +1,57 @@
++/*************************************************
++* Exim - an Internet mail transport agent *
++*************************************************/
++
++/* Copyright (c) University of Cambridge 1995 - 2001 */
++/* See the file NOTICE for conditions of use and distribution. */
++
++#include <whoson.h>
++
++#include "../exim.h"
++#include "whoson.h"
++
++
++/*************************************************
++* Open entry point *
++*************************************************/
++
++/* See local README for interface description. */
++
++void *
++whoson_open(char *filename, char **errmsg)
++{
++filename = filename; /* Keep picky compilers happy */
++errmsg = errmsg;
++return (void *)(1); /* Just return something non-null */
++}
++
++
++
++/*************************************************
++* Find entry point *
++*************************************************/
++
++/* See local README for interface description. */
++
++int
++whoson_find(void *handle, char *filename, char *query, int length,
++ char **result, char **errmsg)
++{
++char buffer[80];
++handle = handle; /* Keep picky compilers happy */
++filename = filename;
++length = length;
++errmsg = errmsg;
++
++switch (wso_query(query,buffer,80)) {
++case 0:
++ *result = string_copy(buffer);
++ return OK;
++case -1:
++ return DEFER;
++default:
++ return FAIL;
++}
++}
++
++/* End of lookups/whoson.c */
+diff -uNr exim-3.31/src/lookups/whoson.h exim-3.31-whoson/src/lookups/whoson.h
+--- exim-3.31/src/lookups/whoson.h Thu Jan 1 01:00:00 1970
++++ exim-3.31-whoson/src/lookups/whoson.h Thu Jul 19 18:28:52 2001
+@@ -0,0 +1,13 @@
++/*************************************************
++* Exim - an Internet mail transport agent *
++*************************************************/
++
++/* Copyright (c) University of Cambridge 1995 - 2001 */
++/* See the file NOTICE for conditions of use and distribution. */
++
++/* Header for the whoson lookup */
++
++extern void *whoson_open(char *, char **);
++extern int whoson_find(void *, char *, char *, int, char **, char **);
++
++/* End of lookups/whoson.h */
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