Realm for server lookup.

ChangeLog

@@ -1,3 +1,13 @@
+2012-08-20  Mats Erik Andersson  <gnu@gisladisker.se>
+
+	Server realm pairing: Let server name determine
+	realm to be contacted, as per library configuration.
+
+	* libinetutils/shishi.c (shishi_auth): Whenever realm
+	is not explicit, call shishi_realm_for_server() to get
+	a usable realm; pass on to shishi_realm_default_set().
+	* libtelnet/shishi.c (krb5shishi_send): Likewise.
+
 2012-08-17  Mats Erik Andersson  <gnu@gisladisker.se>
 
 	telnet: Selectable principal name.

libinetutils/shishi.c

@@ -28,7 +28,7 @@
 # include <unistd.h>
 # include <shishi_def.h>
 
-/* shishi authentication */
+/* shishi authentication, client side */
 int
 shishi_auth (Shishi ** handle, int verbose, char **cname,
 	     const char *sname, int sock, char *cmd,
@@ -130,6 +130,19 @@ shishi_auth (Shishi ** handle, int verbose, char **cname,
   else
     sprintf (tmpserver, "%s/%s", SERVICE, sname + (p ? 1 : 0));
 
+  /* Retrieve realm assigned to this server as per configuration,
+   * unless an explicit domain was passed in the call.
+   */
+  if (!realm)
+    {
+      if (!p)
+	p = sname;
+      else if (*p == '/')
+	++p;
+
+      shishi_realm_default_set (h, shishi_realm_for_server (h, p));
+    }
+
   hint.client = (char *) *cname;
   hint.server = (char *) tmpserver;
 
@@ -254,6 +267,7 @@ senderror (int s, char type, char *buf)
   write (s, buf, strlen (buf));
 }
 
+/* shishi authentication, server side */
 int
 get_auth (int infd, Shishi ** handle, Shishi_ap ** ap,
 	  Shishi_key ** enckey, const char **err_msg, int *protoversion,

libtelnet/shishi.c

@@ -186,6 +186,19 @@ krb5shishi_send (TN_Authenticator * ap)
 
   if (dest_realm && *dest_realm)
     shishi_realm_default_set (shishi_handle, dest_realm);
+  else
+    {
+      /* Retrieve realm assigned to this server as per configuration.  */
+      char *p = strchr (RemoteHostName, '/');
+
+      if (p)
+	++p;
+      else
+	p = RemoteHostName;
+
+      shishi_realm_default_set (shishi_handle,
+				shishi_realm_for_server (shishi_handle, p));
+    }
 
   tkt = shishi_tkts_get (shishi_tkts_default (shishi_handle), &hint);
   free (tmp);