1 files changed, 191 insertions, 0 deletions

diff --git a/src/cli/util/gnunet-resolver.c b/src/cli/util/gnunet-resolver.c
new file mode 100644
index 000000000..a23aeb4aa
--- /dev/null
+++ b/src/cli/util/gnunet-resolver.c
@@ -0,0 +1,191 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2010 GNUnet e.V.
+
+     GNUnet is free software: you can redistribute it and/or modify it
+     under the terms of the GNU Affero General Public License as published
+     by the Free Software Foundation, either version 3 of the License,
+     or (at your option) any later version.
+
+     GNUnet 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
+     Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+     SPDX-License-Identifier: AGPL3.0-or-later
+ */
+
+/**
+ * @file util/gnunet-resolver.c
+ * @brief tool to test resolver
+ * @author Christian Grothoff
+ */
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_resolver_service.h"
+
+#define GET_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
+
+/**
+ * Flag for reverse lookup.
+ */
+static int reverse;
+
+
+/**
+ * Prints each hostname obtained from DNS.
+ *
+ * @param cls closure (unused)
+ * @param hostname one of the names for the host, NULL
+ *        on the last call to the callback
+ */
+static void
+print_hostname (void *cls,
+                const char *hostname)
+{
+  (void) cls;
+  if (NULL == hostname)
+    return;
+  fprintf (stdout,
+           "%s\n",
+           hostname);
+}
+
+
+/**
+ * Callback function to display address.
+ *
+ * @param cls closure (unused)
+ * @param addr one of the addresses of the host, NULL for the last address
+ * @param addrlen length of the address
+ */
+static void
+print_sockaddr (void *cls,
+                const struct sockaddr *addr,
+                socklen_t addrlen)
+{
+  (void) cls;
+  if (NULL == addr)
+    return;
+  fprintf (stdout,
+           "%s\n",
+           GNUNET_a2s (addr,
+                       addrlen));
+}
+
+
+/**
+ * Main function that will be run by the scheduler.
+ *
+ * @param cls closure
+ * @param args remaining command-line arguments
+ * @param cfgfile name of the configuration file used (for saving, can be NULL!)
+ * @param cfg configuration
+ */
+static void
+run (void *cls,
+     char *const *args,
+     const char *cfgfile,
+     const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+  const struct sockaddr *sa;
+  socklen_t salen;
+  struct sockaddr_in v4;
+  struct sockaddr_in6 v6;
+
+  (void) cls;
+  (void) cfgfile;
+  (void) cfg;
+  if (NULL == args[0])
+    return;
+  if (! reverse)
+  {
+    GNUNET_RESOLVER_ip_get (args[0],
+                            AF_UNSPEC,
+                            GET_TIMEOUT,
+                            &print_sockaddr,
+                            NULL);
+    return;
+  }
+
+  sa = NULL;
+  memset (&v4, 0, sizeof(v4));
+  v4.sin_family = AF_INET;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+  v4.sin_len = sizeof(v4);
+#endif
+  if (1 == inet_pton (AF_INET,
+                      args[0],
+                      &v4.sin_addr))
+  {
+    sa = (struct sockaddr *) &v4;
+    salen = sizeof(v4);
+  }
+  memset (&v6, 0, sizeof(v6));
+  v6.sin6_family = AF_INET6;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+  v6.sin6_len = sizeof(v6);
+#endif
+  if (1 == inet_pton (AF_INET6,
+                      args[0],
+                      &v6.sin6_addr))
+  {
+    sa = (struct sockaddr *) &v6;
+    salen = sizeof(v6);
+  }
+  if (NULL == sa)
+  {
+    fprintf (stderr,
+             "`%s' is not a valid IP: %s\n",
+             args[0],
+             strerror (errno));
+    return;
+  }
+  GNUNET_RESOLVER_hostname_get (sa, salen,
+                                GNUNET_YES,
+                                GET_TIMEOUT,
+                                &print_hostname,
+                                NULL);
+}
+
+
+/**
+ * The main function to access GNUnet's DNS resolver.
+ *
+ * @param argc number of arguments from the command line
+ * @param argv command line arguments
+ * @return 0 ok, 1 on error
+ */
+int
+main (int argc, char *const *argv)
+{
+  struct GNUNET_GETOPT_CommandLineOption options[] = {
+    GNUNET_GETOPT_option_flag ('r',
+                               "reverse",
+                               gettext_noop ("perform a reverse lookup"),
+                               &reverse),
+    GNUNET_GETOPT_OPTION_END
+  };
+  int ret;
+
+  if (GNUNET_OK !=
+      GNUNET_STRINGS_get_utf8_args (argc, argv,
+                                    &argc, &argv))
+    return 2;
+
+  ret = (GNUNET_OK ==
+         GNUNET_PROGRAM_run (argc, argv,
+                             "gnunet-resolver [hostname]",
+                             gettext_noop ("Use built-in GNUnet stub resolver"),
+                             options,
+                             &run, NULL)) ? 0 : 1;
+  GNUNET_free_nz ((void *) argv);
+  return ret;
+}
+
+
+/* end of gnunet-resolver.c */