Don't loose if the remote host has no DNS entry.

cgi-server.scm

@@ -188,7 +188,7 @@
 	  ("PATH_TRANSLATED" . ,path-translated)
 	  ("SCRIPT_NAME"     . ,script-name)
 
-	  ("REMOTE_HOST"  . ,(host-info:name (host-info raddr)))
+	  ("REMOTE_HOST"  . ,(host-name-or-empty raddr))
 	  ("REMOTE_ADDR"  . ,(format-internet-host-address rhost))
 
 	  ;; ("AUTH_TYPE" . xx)			; Random authentication

httpd-core.scm

@@ -180,10 +180,9 @@
   (let ((line (read-crlf-line)))
 
     ;; Blat out some logging info.
-    
      (if *http-log?*
 	 (let* ((addr (socket-remote-address sock))
-	       (host (host-info:name (host-info addr))))
+		(host (host-name-or-empty addr)))
 	   (http-log "~a: ~a~%" host line)))
 
     (if (eof-object? line)

modules.scm

@@ -281,6 +281,7 @@
 	uri
 	url
 	formats
+	sunet-utilities
 	scheme)
   (files httpd-core))
 
@@ -328,6 +329,7 @@
 	scsh			; syscalls
 	formats			; format
 	format-net              ; FORMAT-INTERNET-HOST-ADDRESS
+	sunet-utilities         ; host-name-or-empty
 	scheme)
   (files cgi-server))
 
@@ -682,3 +684,14 @@
 
     (define (eval-safely exp)
       (ignore-errors (lambda () (eval exp (new-safe-package)))))))
+
+(define-structure sunet-utilities (export host-name-or-empty)
+  (open scsh
+	scheme
+	handle-fatal-error)
+  (begin
+    (define (host-name-or-empty addr)
+      (with-fatal-error-handler
+       (lambda (condition more)
+	 "")
+       (host-info:name (host-info addr))))))