dirmngr: Do not use MAXDNAME.

* dirmngr/dns-stuff.c (getsrv): Replace MAXDNAME.
* dirmngr/dns-stuff.h (MAXDNAME): Remove.
(struct srventry): Use a fixed value instead of MAXDNAME.
* dirmngr/http.c (connect_server): Use DIMof instead of MAXDNAME.
Malloc a helper array.

--

Depending on the order of included headers it might be that we allocate
the array with a different size than what we test against in another
module.  To make it more robust we use the actual known size of
checking.

A better would be to use a linked list and avoid these large arrays.

Signed-off-by: Werner Koch <wk@gnupg.org>

dirmngr/dns-stuff.h

@@ -71,18 +71,13 @@ struct dns_addrinfo_s
 };
 
 
-
-#ifndef MAXDNAME
-#define MAXDNAME 1025
-#endif
-
 struct srventry
 {
   unsigned short priority;
   unsigned short weight;
   unsigned short port;
   int run_count;
-  char target[MAXDNAME];
+  char target[1025];
 };