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authorChristian Grothoff <christian@grothoff.org>2013-10-16 12:12:39 +0000
committerChristian Grothoff <christian@grothoff.org>2013-10-16 12:12:39 +0000
commit54d912e8c447f302172bf6dc3b3fe6769f4ac685 (patch)
treef6cfc4bf40d075509c7c8236be17a503cc3ab558 /src/conversation/plugin_gnsrecord_conversation.c
parent10e14fa5739998d29fb8f47f54e45df52eff0d9d (diff)
-add gnsrecord plugin for conversation
Diffstat (limited to 'src/conversation/plugin_gnsrecord_conversation.c')
-rw-r--r--src/conversation/plugin_gnsrecord_conversation.c224
1 files changed, 224 insertions, 0 deletions
diff --git a/src/conversation/plugin_gnsrecord_conversation.c b/src/conversation/plugin_gnsrecord_conversation.c
new file mode 100644
index 000000000..d412d06fa
--- /dev/null
+++ b/src/conversation/plugin_gnsrecord_conversation.c
@@ -0,0 +1,224 @@
+/*
+ This file is part of GNUnet
+ (C) 2013 Christian Grothoff (and other contributing authors)
+
+ GNUnet 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, 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @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)
+{
+ 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))
+ return NULL;
+ pr = data;
+ if (0 != ntohl (pr->version))
+ return NULL;
+ pkey = GNUNET_CRYPTO_eddsa_public_key_to_string (&pr->peer.public_key);
+ GNUNET_asprintf (&ret,
+ "%u-%s",
+ ntohl (pr->line),
+ pkey);
+ 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)
+{
+ if (NULL == s)
+ return GNUNET_SYSERR;
+ switch (type)
+ {
+ case GNUNET_GNSRECORD_TYPE_PHONE:
+ {
+ struct GNUNET_CONVERSATION_PhoneRecord *pr;
+ unsigned int line;
+ const char *dash;
+ struct GNUNET_PeerIdentity peer;
+
+ if ( (NULL == (dash = strchr (s, '-'))) ||
+ (1 != sscanf (s, "%u-", &line)) ||
+ (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 (0);
+ pr->line = htonl ((uint32_t) line);
+ 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 (i.e. "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;
+
+ 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 (i.e. 1) to the corresponding type string (i.e. "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;
+
+ 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;
+
+ 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 */