[OpenAFS-devel] Windows client: auto-select of Loopback lana

[Scott D. Williams]

This will enable the windows client to auto-select the Windows Loopback 
Adapter lana, if present. One caveat: it uses the default mac address 
of  the loopback adapter -- I have not seen any instance where it differs, 
nor any method for changing it. Please advise if I've missed something.
The corresponding service binary is available here for testing purposes: 
http://www.unc.edu/~sdw/afsd_service_wla.exe

--Scott

--- orig/src/WINNT/afsd/smb.c   2002-07-26 01:14:26.000000000 -0400
+++ update/src/WINNT/afsd/smb.c 2002-11-22 10:59:29.000000000 -0500
@@ -6050,6 +6050,24 @@
      int len;
      int lana_found = 0;

+       /*******************************************************************/
+       /*      ms loopback adapter scan
+       /*******************************************************************/
+       struct
+       {
+               ADAPTER_STATUS status;
+               NAME_BUFFER    NameBuff [30];
+       }       Adapter;
+
+       int j;
+       BOOL wla_found;
+
+       /*      AFAIK, this is the default for the ms loopback adapter.*/
+       unsigned char kWLA_MAC[6] = { 0x02, 0x00, 0x4c, 0x4f, 0x4f, 0x50 };
+       /*******************************************************************/
+
+
+
      /* setup the NCB system */
      ncbp = GetNCB();
  #ifdef DJGPP
@@ -6091,6 +6109,34 @@
          else {
              sprintf(s, "Netbios NCBRESET lana %d succeeded", 
lana_list.lana[i]);
              afsi_log(s);
+
+ 
/*******************************************************************/
+                       /* check to see if this is the "Microsoft Loopback 
Adapter"        */
+ 
/*******************************************************************/
+                       memset( ncbp, 0, sizeof (*ncbp) );
+                       ncbp->ncb_command = NCBASTAT;
+                       ncbp->ncb_lana_num = lana_list.lana[i];
+                       strcpy( ncbp->ncb_callname,  "*               " );
+                       ncbp->ncb_buffer = (char *) &Adapter;
+                       ncbp->ncb_length = sizeof(Adapter);
+                       code = Netbios( ncbp );
+
+                       if ( code == 0 ) {
+                               wla_found = TRUE;
+                               for (j=0; wla_found && (j<6); j++)
+                                       wla_found = ( 
Adapter.status.adapter_address[j] == kWLA_MAC[j] );
+
+                               if ( wla_found ) {
+                                       sprintf(s, "Windows Loopback 
Adapter detected lana %d", lana_list.lana[i]);
+                                       afsi_log(s);
+
+                                       /* select this lana; no need to 
continue */
+                                       lana_list.length = 1;
+                                       lana_list.lana[0] = lana_list.lana[i];
+                                       break;
+                               }
+                       }
+ 
/*******************************************************************/
          }
      }
  #else