moving block plugins to respective subsystem

2 files changed, 184 insertions, 0 deletions

diff --git a/src/vpn/Makefile.am b/src/vpn/Makefile.am
index c6b390aca..e69c5643e 100644
--- a/src/vpn/Makefile.am
+++ b/src/vpn/Makefile.am
@@ -10,6 +10,8 @@ endif
 
 pkgcfgdir= $(pkgdatadir)/config.d/
 
+plugindir = $(libdir)/gnunet
+
 dist_pkgcfg_DATA = \
   vpn.conf
 
@@ -72,6 +74,18 @@ gnunet_daemon_exit_LDADD = \
   $(top_builddir)/src/mesh/libgnunetmesh.la \
   $(GN_LIBINTL)
 
+
+plugin_LTLIBRARIES = \
+  libgnunet_plugin_block_dns.la 
+
+libgnunet_plugin_block_dns_la_SOURCES = \
+  plugin_block_dns.c
+libgnunet_plugin_block_dns_la_LIBADD = \
+  $(top_builddir)/src/util/libgnunetutil.la
+libgnunet_plugin_block_dns_la_LDFLAGS = \
+  $(top_builddir)/src/block/$(GN_PLUGIN_LDFLAGS)
+
+
 #check_PROGRAMS = \
 # test_XXX
 
diff --git a/src/vpn/plugin_block_dns.c b/src/vpn/plugin_block_dns.c
new file mode 100644
index 000000000..b33b3798a
--- /dev/null
+++ b/src/vpn/plugin_block_dns.c
@@ -0,0 +1,170 @@
+/*
+     This file is part of GNUnet
+     (C) 2010 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 block/plugin_block_dns.c
+ * @brief block plugin for storing .gnunet-bindings
+ * @author Philipp Tölke
+ */
+
+#include "platform.h"
+#include "gnunet_block_plugin.h"
+#include "block_dns.h"
+#include "gnunet_signatures.h"
+
+#define DEBUG_DHT GNUNET_EXTRA_LOGGING
+
+/**
+ * Function called to validate a reply or a request.  For
+ * request evaluation, simply pass "NULL" for the reply_block.
+ *
+ * @param cls closure
+ * @param type block type
+ * @param query original query (hash)
+ * @param bf pointer to bloom filter associated with query; possibly updated (!)
+ * @param bf_mutator mutation value for bf
+ * @param xquery extended query data (can be NULL, depending on type)
+ * @param xquery_size number of bytes in xquery
+ * @param reply_block response to validate
+ * @param reply_block_size number of bytes in reply block
+ * @return characterization of result
+ */
+static enum GNUNET_BLOCK_EvaluationResult
+block_plugin_dns_evaluate (void *cls, enum GNUNET_BLOCK_Type type,
+                           const GNUNET_HashCode * query,
+                           struct GNUNET_CONTAINER_BloomFilter **bf,
+                           int32_t bf_mutator, const void *xquery,
+                           size_t xquery_size, const void *reply_block,
+                           size_t reply_block_size)
+{
+  switch (type)
+  {
+  case GNUNET_BLOCK_TYPE_DNS:
+    if (xquery_size != 0)
+      return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
+
+    if (reply_block_size == 0)
+      return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
+
+    if (reply_block_size != sizeof (struct GNUNET_DNS_Record))
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                  "DNS-Block is invalid: reply_block_size=%d != %d\n",
+                  reply_block_size, sizeof (struct GNUNET_DNS_Record));
+      return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
+    }
+
+    const struct GNUNET_DNS_Record *rec = reply_block;
+
+    if (ntohl (rec->purpose.size) !=
+        sizeof (struct GNUNET_DNS_Record) -
+        sizeof (struct GNUNET_CRYPTO_RsaSignature))
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                  "DNS-Block is invalid: rec->purpose.size=%d != %d\n",
+                  ntohl (rec->purpose.size),
+                  sizeof (struct GNUNET_DNS_Record) -
+                  sizeof (struct GNUNET_CRYPTO_RsaSignature));
+      return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
+    }
+
+    if (GNUNET_TIME_relative_get_zero ().rel_value ==
+        GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh
+                                            (rec->expiration_time)).rel_value)
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "DNS-Block is invalid: Timeout\n");
+      return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
+    }
+
+    if (GNUNET_OK !=
+        GNUNET_CRYPTO_rsa_verify (htonl (GNUNET_SIGNATURE_PURPOSE_DNS_RECORD),
+                                  &rec->purpose, &rec->signature, &rec->peer))
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                  "DNS-Block is invalid: invalid signature\n");
+      return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
+    }
+
+    /* How to decide whether there are no more? */
+    return GNUNET_BLOCK_EVALUATION_OK_MORE;
+  default:
+    return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
+  }
+}
+
+
+/**
+ * Function called to obtain the key for a block.
+ *
+ * @param cls closure
+ * @param type block type
+ * @param block block to get the key for
+ * @param block_size number of bytes in block
+ * @param key set to the key (query) for the given block
+ * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
+ *         (or if extracting a key from a block of this type does not work)
+ */
+static int
+block_plugin_dns_get_key (void *cls, enum GNUNET_BLOCK_Type type,
+                          const void *block, size_t block_size,
+                          GNUNET_HashCode * key)
+{
+  if (type != GNUNET_BLOCK_TYPE_DNS)
+    return GNUNET_SYSERR;
+  const struct GNUNET_DNS_Record *rec = block;
+
+  memcpy (key, &rec->service_descriptor, sizeof (GNUNET_HashCode));
+  return GNUNET_OK;
+}
+
+/**
+ * Entry point for the plugin.
+ */
+void *
+libgnunet_plugin_block_dns_init (void *cls)
+{
+  static enum GNUNET_BLOCK_Type types[] =
+  {
+    GNUNET_BLOCK_TYPE_DNS,
+    GNUNET_BLOCK_TYPE_ANY       /* end of list */
+  };
+  struct GNUNET_BLOCK_PluginFunctions *api;
+
+  api = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_PluginFunctions));
+  api->evaluate = &block_plugin_dns_evaluate;
+  api->get_key = &block_plugin_dns_get_key;
+  api->types = types;
+  return api;
+}
+
+
+/**
+ * Exit point from the plugin.
+ */
+void *
+libgnunet_plugin_block_dns_done (void *cls)
+{
+  struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
+
+  GNUNET_free (api);
+  return NULL;
+}
+
+/* end of plugin_block_dns.c */