Patch provided by John R. Johns II 
<jrjohns at den dot treeweasel dot com>

This patch adds an option "-8", which allows dropdown for RFC959 for
anonymous users only, while all account holders must use SafeTP (like
"-9").

To apply this patch:
  % cd sftpd-1.40
  % patch < anon.patch.txt


*** sftpd.cpp.orig	Sun Nov 14 01:48:04 1999
--- sftpd.cpp	Sat May  6 20:25:26 2000
***************
*** 180,181 ****
--- 180,182 ----
      allowRfc959(DEFAULT_ALLOW_RFC959),
+     allowRfc959_anon(DEFAULT_ALLOW_RFC959),
      allowNonReflexivePorts(DEFAULT_ALLOW_NONREFLEXIVE_PORT),
***************
*** 363,364 ****
--- 364,371 ----
              allowRfc959 = false;
+             allowRfc959_anon = false;
+             break;
+ 
+           case '8':
+             allowRfc959 = false;
+             allowRfc959_anon = true;
              break;
***************
*** 1327,1331 ****
          handleOriginalRequest(request);
        }
  
!       else {
          // disallow
--- 1334,1352 ----
          handleOriginalRequest(request);
+         break;  // Exit this case
        }

!       else if (allowRfc959_anon) {
!         if (  (!strcmp(request.getData(),"ftp"))
!            || (!strcmp(request.getData(),"anonymous")) ) {
!            // 959 dropdown
!            state = STATE_959_INTEROP;
!            log("dropping down to 959 compatibility mode");
! 
!            // call this function recursively to handle 959 command
!            handleOriginalRequest(request);
!            break;  // Exit this case
!         }
!       }
! 
!       {
          // disallow

*** sftpd.h.orig	Fri Nov 12 17:19:05 1999
--- sftpd.h	Sat May  6 19:40:10 2000
***************
*** 95,96 ****
--- 95,97 ----
    bool allowRfc959;                // permit 959 dropdown
+   bool allowRfc959_anon;           // permit 959 dropdown for anonymous
    bool allowNonReflexivePorts;     // permit PORT addr != client_control addr