gpg: Move all DNS access to Dirmngr.

* common/dns-cert.h: Move to ../dirmngr/.
* common/dns-cert.c: Move to ../dirmngr/.  Change args to return the
key as a buffer.
* common/t-dns-cert.c: Move to ../dirmngr/.
* common/pka.c, common/pka.h, common/t-pka.c: Remove.

* dirmngr/server.c (data_line_cookie_write): Factor code out to
data_line_write and make it a wrapper for that.
(data_line_write): New.
(cmd_dns_cert): New.
(register_commands): Register new command.

* g10/Makefile.am (LDADD): Remove DNSLIBS.
* g10/call-dirmngr.c (dns_cert_parm_s): New.
(dns_cert_data_cb, dns_cert_status_cb): New.
(gpg_dirmngr_dns_cert): New.
(gpg_dirmngr_get_pka): New.
* g10/gpgv.c (gpg_dirmngr_get_pka): New dummy function.
* g10/keyserver.c (keyserver_import_cert): Replace get_dns_cert by
gpg_dirmngr_dns_cert.
(keyserver_import_pka): Replace get_pka_info by gpg_dirmngr_get_pka.
* g10/mainproc.c: Include call-dirmngr.h.
(pka_uri_from_sig): Add CTX arg. Replace get_pka_info by
gpg_dirmngr_get_pka.
--

With this patch gpg does not do any network access itself but uses
dirmngr for that.  Note that we need to keep linking to NETLIBS due to
the logging code and because we need TCP for our socket emulation
under Windows.  Probably also required for Solaris etc.

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

dirmngr/t-dns-cert.c

@@ -0,0 +1,93 @@
+/* t-dns-cert.c - Module test for dns-cert.c
+ * Copyright (C) 2011 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include "util.h"
+#include "dns-cert.h"
+
+
+int
+main (int argc, char **argv)
+{
+  gpg_error_t err;
+  unsigned char *fpr;
+  size_t fpr_len;
+  char *url;
+  void *key;
+  size_t keylen;
+  char const *name;
+
+  if (argc)
+    {
+      argc--;
+      argv++;
+    }
+
+  if (!argc)
+    name = "simon.josefsson.org";
+  else if (argc == 1)
+    name = *argv;
+  else
+    {
+      fputs ("usage: t-dns-cert [name]\n", stderr);
+      return 1;
+    }
+
+  printf ("CERT lookup on '%s'\n", name);
+
+  err = get_dns_cert (name, DNS_CERTTYPE_ANY, &key, &keylen,
+                      &fpr, &fpr_len, &url);
+  if (err)
+    printf ("get_dns_cert failed: %s <%s>\n",
+            gpg_strerror (err), gpg_strsource (err));
+  else if (key)
+    {
+      printf ("Key found (%u bytes)\n", (unsigned int)keylen);
+    }
+  else
+    {
+      if (fpr)
+	{
+	  int i;
+
+	  printf ("Fingerprint found (%d bytes): ", (int)fpr_len);
+	  for (i = 0; i < fpr_len; i++)
+	    printf ("%02X", fpr[i]);
+	  putchar ('\n');
+	}
+      else
+	printf ("No fingerprint found\n");
+
+      if (url)
+	printf ("URL found: %s\n", url);
+      else
+	printf ("No URL found\n");
+
+    }
+
+  xfree (key);
+  xfree (fpr);
+  xfree (url);
+
+  return 0;
+}