1 files changed, 262 insertions, 0 deletions

diff --git a/src/contrib/service/conversation/plugin_gnsrecord_conversation.c b/src/contrib/service/conversation/plugin_gnsrecord_conversation.c
new file mode 100644
index 000000000..786711c8e
--- /dev/null
+++ b/src/contrib/service/conversation/plugin_gnsrecord_conversation.c
@@ -0,0 +1,262 @@
+/*
+     This file is part of GNUnet
+     Copyright (C) 2013 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 conversation/plugin_gnsrecord_conversation.c
+ * @brief gnsrecord plugin to provide the API for fundamental GNS records
+ *                  This includes the VPN record because GNS resolution
+ *                  is expected to understand VPN records and (if needed)
+ *                  map the result to A/AAAA.
+ * @author Christian Grothoff
+ */
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_gnsrecord_lib.h"
+#include "gnunet_conversation_service.h"
+#include "gnunet_gnsrecord_plugin.h"
+
+
+/**
+ * Convert the 'value' of a record to a string.
+ *
+ * @param cls closure, unused
+ * @param type type of the record
+ * @param data value in binary encoding
+ * @param data_size number of bytes in @a data
+ * @return NULL on error, otherwise human-readable representation of the value
+ */
+static char *
+conversation_value_to_string (void *cls,
+                              uint32_t type,
+                              const void *data,
+                              size_t data_size)
+{
+  char *s;
+
+  (void) cls;
+  switch (type)
+  {
+  case GNUNET_GNSRECORD_TYPE_PHONE:
+    {
+      const struct GNUNET_CONVERSATION_PhoneRecord *pr;
+      char *ret;
+      char *pkey;
+
+      if (data_size != sizeof(struct GNUNET_CONVERSATION_PhoneRecord))
+      {
+        GNUNET_break_op (0);
+        return NULL;
+      }
+      pr = data;
+      if (1 != ntohl (pr->version))
+      {
+        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                    _ ("PHONE version %u not supported\n"),
+                    ntohl (pr->version));
+        return NULL;
+      }
+      pkey = GNUNET_CRYPTO_eddsa_public_key_to_string (&pr->peer.public_key);
+      s = GNUNET_STRINGS_data_to_string_alloc (&pr->line_port,
+                                               sizeof(struct GNUNET_HashCode));
+
+      GNUNET_asprintf (&ret,
+                       "%s-%s",
+                       s,
+                       pkey);
+      GNUNET_free (s);
+      GNUNET_free (pkey);
+      return ret;
+    }
+
+  default:
+    return NULL;
+  }
+}
+
+
+/**
+ * Convert human-readable version of a 'value' of a record to the binary
+ * representation.
+ *
+ * @param cls closure, unused
+ * @param type type of the record
+ * @param s human-readable string
+ * @param data set to value in binary encoding (will be allocated)
+ * @param data_size set to number of bytes in @a data
+ * @return #GNUNET_OK on success
+ */
+static int
+conversation_string_to_value (void *cls,
+                              uint32_t type,
+                              const char *s,
+                              void **data,
+                              size_t *data_size)
+{
+  (void) cls;
+  if (NULL == s)
+  {
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+  switch (type)
+  {
+  case GNUNET_GNSRECORD_TYPE_PHONE:
+    {
+      struct GNUNET_CONVERSATION_PhoneRecord *pr;
+      char line_port[103];
+      const char *dash;
+      struct GNUNET_PeerIdentity peer;
+
+      if ((NULL == (dash = strchr (s, '-'))) ||
+          (1 != sscanf (s, "%103s-", line_port)) ||
+          (GNUNET_OK !=
+           GNUNET_CRYPTO_eddsa_public_key_from_string (dash + 1,
+                                                       strlen (dash + 1),
+                                                       &peer.public_key)))
+      {
+        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                    _ ("Unable to parse PHONE record `%s'\n"),
+                    s);
+        return GNUNET_SYSERR;
+      }
+      pr = GNUNET_new (struct GNUNET_CONVERSATION_PhoneRecord);
+      pr->version = htonl (1);
+      pr->reserved = htonl (0);
+      if (GNUNET_OK !=
+          GNUNET_STRINGS_string_to_data (line_port,
+                                         strlen (line_port),
+                                         &pr->line_port,
+                                         sizeof(struct GNUNET_HashCode)))
+      {
+        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                    _ ("Unable to parse PHONE record `%s'\n"),
+                    s);
+        GNUNET_free (pr);
+        return GNUNET_SYSERR;
+      }
+      pr->peer = peer;
+      *data = pr;
+      *data_size = sizeof(struct GNUNET_CONVERSATION_PhoneRecord);
+      return GNUNET_OK;
+    }
+
+  default:
+    return GNUNET_SYSERR;
+  }
+}
+
+
+/**
+ * Mapping of record type numbers to human-readable
+ * record type names.
+ */
+static struct
+{
+  const char *name;
+  uint32_t number;
+} name_map[] = {
+  { "PHONE", GNUNET_GNSRECORD_TYPE_PHONE },
+  { NULL, UINT32_MAX }
+};
+
+
+/**
+ * Convert a type name (e.g. "AAAA") to the corresponding number.
+ *
+ * @param cls closure, unused
+ * @param gns_typename name to convert
+ * @return corresponding number, UINT32_MAX on error
+ */
+static uint32_t
+conversation_typename_to_number (void *cls,
+                                 const char *gns_typename)
+{
+  unsigned int i;
+
+  (void) cls;
+  i = 0;
+  while ((name_map[i].name != NULL) &&
+         (0 != strcasecmp (gns_typename, name_map[i].name)))
+    i++;
+  return name_map[i].number;
+}
+
+
+/**
+ * Convert a type number to the corresponding type string (e.g. 1 to "A")
+ *
+ * @param cls closure, unused
+ * @param type number of a type to convert
+ * @return corresponding typestring, NULL on error
+ */
+static const char *
+conversation_number_to_typename (void *cls,
+                                 uint32_t type)
+{
+  unsigned int i;
+
+  (void) cls;
+  i = 0;
+  while ((name_map[i].name != NULL) &&
+         (type != name_map[i].number))
+    i++;
+  return name_map[i].name;
+}
+
+
+/**
+ * Entry point for the plugin.
+ *
+ * @param cls NULL
+ * @return the exported block API
+ */
+void *
+libgnunet_plugin_gnsrecord_conversation_init (void *cls)
+{
+  struct GNUNET_GNSRECORD_PluginFunctions *api;
+
+  (void) cls;
+  api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions);
+  api->value_to_string = &conversation_value_to_string;
+  api->string_to_value = &conversation_string_to_value;
+  api->typename_to_number = &conversation_typename_to_number;
+  api->number_to_typename = &conversation_number_to_typename;
+  return api;
+}
+
+
+/**
+ * Exit point from the plugin.
+ *
+ * @param cls the return value from #libgnunet_plugin_block_test_init
+ * @return NULL
+ */
+void *
+libgnunet_plugin_gnsrecord_conversation_done (void *cls)
+{
+  struct GNUNET_GNSRECORD_PluginFunctions *api = cls;
+
+  GNUNET_free (api);
+  return NULL;
+}
+
+
+/* end of plugin_gnsrecord_conversation.c */