dirmngr: Fix problems with the getsrv function.

* dirmngr/dns-stuff.c (opt_debug, opt_verbose): New vars.
(set_dns_verbose): New func.
(libdns_switch_port_p): Add debug output.
(resolve_dns_name): Ditto.
(get_dns_cert): Ditto.
(get_dns_cname): Ditto.
(getsrv_libdns, getsrv_standard): Change SRVCOUNT to an unsigend int.
(getsrv): Rename to ...
((get_dns_srv): this.  Add arg R_COUNT and return an error.  Add debug
output.
* dirmngr/http.c: Adjust for chnaged getsrv().
* dirmngr/ks-engine-hkp.c (map_host): Ditto.
* dirmngr/t-dns-stuff.c (main): Ditto.  Call set_dns_verbose.
* dirmngr/dirmngr.c (parse_rereadable_options): Call set_dns_verbose.
--

Due to our switch to Libdns getsrv didn't worked correctly because it
returned -1 for an NXDOMAIN.  However, it is perfectly okay to have no
SRV record and thus we change the way this function is called to be
aligned with the other functions and also map NXDOMAIN to a zero SRV
record count.

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

dirmngr/dns-stuff.h

@@ -92,6 +92,9 @@ struct srventry
 };
 
 
+/* Set verbosity and debug mode for this module. */
+void set_dns_verbose (int verbose, int debug);
+
 /* Calling this function with YES set to True forces the use of the
  * standard resolver even if dirmngr has been built with support for
  * an alternative resolver.  */
@@ -145,8 +148,9 @@ gpg_error_t get_dns_cert (const char *name, int want_certtype,
                           unsigned char **r_fpr, size_t *r_fprlen,
                           char **r_url);
 
-
-int getsrv (const char *name,struct srventry **list);
+/* Return an array of SRV records.  */
+gpg_error_t get_dns_srv (const char *name,
+                         struct srventry **list, unsigned int *r_count);
 
 
 #endif /*GNUPG_DIRMNGR_DNS_STUFF_H*/