1 files changed, 401 insertions, 0 deletions

diff --git a/src/service/hostlist/gnunet-daemon-hostlist.c b/src/service/hostlist/gnunet-daemon-hostlist.c
new file mode 100644
index 000000000..54e070f89
--- /dev/null
+++ b/src/service/hostlist/gnunet-daemon-hostlist.c
@@ -0,0 +1,401 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2007, 2008, 2009, 2014 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 hostlist/gnunet-daemon-hostlist.c
+ * @brief code for bootstrapping via hostlist servers
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet-daemon-hostlist_client.h"
+#include "gnunet_core_service.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_protocols.h"
+#include "gnunet_statistics_service.h"
+
+#include "gnunet-daemon-hostlist_server.h"
+
+/**
+ * Set if we are allowed to advertise our hostlist to others.
+ */
+static int advertising;
+
+/**
+ * Set if the user wants us to run a hostlist server.
+ */
+static int provide_hostlist;
+
+/**
+ * Handle to hostlist server's connect handler
+ */
+static GNUNET_CORE_ConnectEventHandler server_ch;
+
+/**
+ * Set if we are allowed to learn about peers by accessing
+ * hostlist servers.
+ */
+static int bootstrapping;
+
+/**
+ * Set if the user allows us to learn about new hostlists
+ * from the network.
+ */
+static int learning;
+
+/**
+ * Statistics handle.
+ */
+static struct GNUNET_STATISTICS_Handle *stats;
+
+/**
+ * Handle to the core service (NULL until we've connected to it).
+ */
+static struct GNUNET_CORE_Handle *core;
+
+/**
+ * Handle to the hostlist client's advertisement handler
+ */
+static GNUNET_HOSTLIST_UriHandler client_adv_handler;
+
+/**
+ * Handle to hostlist client's connect handler
+ */
+static GNUNET_CORE_ConnectEventHandler client_ch;
+
+/**
+ * Handle to hostlist client's disconnect handler
+ */
+static GNUNET_CORE_DisconnectEventHandler client_dh;
+
+GNUNET_NETWORK_STRUCT_BEGIN
+
+/**
+ * A HOSTLIST_ADV message is used to exchange information about
+ * hostlist advertisements.  This struct is always
+ * followed by the actual url under which the hostlist can be obtained:
+ *
+ * 1) transport-name (0-terminated)
+ * 2) address-length (uint32_t, network byte order; possibly
+ *    unaligned!)
+ * 3) address expiration (GNUNET_TIME_AbsoluteNBO); possibly
+ *    unaligned!)
+ * 4) address (address-length bytes; possibly unaligned!)
+ */
+struct GNUNET_HOSTLIST_ADV_Message
+{
+  /**
+   * Type will be GNUNET_MESSAGE_TYPE_HOSTLIST_ADVERTISEMENT.
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Always zero (for alignment).
+   */
+  uint32_t reserved GNUNET_PACKED;
+};
+GNUNET_NETWORK_STRUCT_END
+
+
+/**
+ * Our own peer identity.
+ */
+static struct GNUNET_PeerIdentity me;
+
+
+/**
+ * Callback invoked once our connection to CORE service is up.
+ *
+ * @param cls NULL
+ * @param my_identity our peer's identity
+ */
+static void
+core_init (void *cls,
+           const struct GNUNET_PeerIdentity *my_identity)
+{
+  me = *my_identity;
+}
+
+
+/**
+ * Core handler for p2p hostlist advertisements
+ *
+ * @param cls closure
+ * @param message advertisement message we got
+ * @return #GNUNET_OK if message is well-formed
+ */
+static int
+check_advertisement (void *cls,
+                     const struct GNUNET_MessageHeader *message)
+{
+  size_t size;
+  size_t uri_size;
+  const char *uri;
+
+  size = ntohs (message->size);
+  if (size <= sizeof(struct GNUNET_MessageHeader))
+  {
+    GNUNET_break_op (0);
+    return GNUNET_SYSERR;
+  }
+  uri = (const char *) &message[1];
+  uri_size = size - sizeof(struct GNUNET_MessageHeader);
+  if (uri[uri_size - 1] != '\0')
+  {
+    GNUNET_break_op (0);
+    return GNUNET_SYSERR;
+  }
+  return GNUNET_OK;
+}
+
+
+/**
+ * Core handler for p2p hostlist advertisements
+ *
+ * @param cls closure
+ * @param message advertisement message we got
+ * @return #GNUNET_OK on success
+ */
+static void
+handle_advertisement (void *cls,
+                      const struct GNUNET_MessageHeader *message)
+{
+  const char *uri = (const char *) &message[1];
+
+  GNUNET_assert (NULL != client_adv_handler);
+  (void) (*client_adv_handler)(uri);
+}
+
+
+/**
+ * Method called whenever a given peer connects.  Wrapper to call both
+ * client's and server's functions
+ *
+ * @param cls closure
+ * @param peer peer identity this notification is about
+ * @param mq queue for sending messages to @a peer
+ * @return peer
+ */
+static void *
+connect_handler (void *cls,
+                 const struct GNUNET_PeerIdentity *peer,
+                 struct GNUNET_MQ_Handle *mq)
+{
+  if (0 == GNUNET_memcmp (&me,
+                          peer))
+    return NULL;
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "A new peer connected, notifying client and server\n");
+  if (NULL != client_ch)
+    GNUNET_assert (NULL ==
+                   (*client_ch)(cls,
+                                peer,
+                                mq));
+  if (NULL != server_ch)
+    GNUNET_assert (NULL ==
+                   (*server_ch)(cls,
+                                peer,
+                                mq));
+  return (void *) peer;
+}
+
+
+/**
+ * Method called whenever a given peer disconnects. Wrapper to call
+ * both client's and server's functions
+ *
+ * @param cls closure
+ * @param peer peer identity this notification is about
+ */
+static void
+disconnect_handler (void *cls,
+                    const struct GNUNET_PeerIdentity *peer,
+                    void *internal_cls)
+{
+  if (0 == GNUNET_memcmp (&me,
+                          peer))
+    return;
+  /* call hostlist client disconnect handler */
+  if (NULL != client_dh)
+    (*client_dh)(cls,
+                 peer,
+                 NULL);
+}
+
+
+/**
+ * Last task run during shutdown.  Disconnects us from
+ * the other services.
+ *
+ * @param cls NULL
+ */
+static void
+cleaning_task (void *cls)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Hostlist daemon is shutting down\n");
+  if (NULL != core)
+  {
+    GNUNET_CORE_disconnect (core);
+    core = NULL;
+  }
+  if (bootstrapping)
+  {
+    GNUNET_HOSTLIST_client_stop ();
+  }
+  if (provide_hostlist)
+  {
+    GNUNET_HOSTLIST_server_stop ();
+  }
+  if (NULL != stats)
+  {
+    GNUNET_STATISTICS_destroy (stats,
+                               GNUNET_NO);
+    stats = NULL;
+  }
+}
+
+
+/**
+ * Main function that will be run.
+ *
+ * @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)
+{
+  struct GNUNET_MQ_MessageHandler learn_handlers[] = {
+    GNUNET_MQ_hd_var_size (advertisement,
+                           GNUNET_MESSAGE_TYPE_HOSTLIST_ADVERTISEMENT,
+                           struct GNUNET_MessageHeader,
+                           NULL),
+    GNUNET_MQ_handler_end ()
+  };
+  struct GNUNET_MQ_MessageHandler no_learn_handlers[] = {
+    GNUNET_MQ_handler_end ()
+  };
+
+  if ((! bootstrapping) && (! learning)
+      && (! provide_hostlist)
+      )
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                _ (
+                  "None of the functions for the hostlist daemon were enabled.  I have no reason to run!\n"));
+    return;
+  }
+  stats = GNUNET_STATISTICS_create ("hostlist", cfg);
+  if (NULL == stats)
+  {
+    GNUNET_break (0);
+    return;
+  }
+  if (bootstrapping)
+    GNUNET_HOSTLIST_client_start (cfg,
+                                  stats,
+                                  &client_ch,
+                                  &client_dh,
+                                  &client_adv_handler,
+                                  learning);
+  core =
+    GNUNET_CORE_connect (cfg,
+                         NULL,
+                         &core_init,
+                         &connect_handler,
+                         &disconnect_handler,
+                         learning ? learn_handlers : no_learn_handlers);
+
+
+  if (provide_hostlist)
+    GNUNET_HOSTLIST_server_start (cfg,
+                                  stats,
+                                  core,
+                                  &server_ch,
+                                  advertising);
+  GNUNET_SCHEDULER_add_shutdown (&cleaning_task,
+                                 NULL);
+
+  if (NULL == core)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                _ ("Failed to connect to `%s' service.\n"), "core");
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  }
+}
+
+
+/**
+ * The main function for the hostlist daemon.
+ *
+ * @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 ('a',
+                               "advertise",
+                               gettext_noop (
+                                 "advertise our hostlist to other peers"),
+                               &advertising),
+    GNUNET_GETOPT_option_flag ('b',
+                               "bootstrap",
+                               gettext_noop (
+                                 "bootstrap using hostlists (it is highly recommended that you always use this option)"),
+                               &bootstrapping),
+    GNUNET_GETOPT_option_flag ('e',
+                               "enable-learning",
+                               gettext_noop (
+                                 "enable learning about hostlist servers from other peers"),
+                               &learning),
+    GNUNET_GETOPT_option_flag ('p',
+                               "provide-hostlist",
+                               gettext_noop ("provide a hostlist server"),
+                               &provide_hostlist),
+    GNUNET_GETOPT_OPTION_END
+  };
+
+  int ret;
+
+  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
+    return 2;
+
+  GNUNET_log_setup ("hostlist", "WARNING", NULL);
+  ret =
+    (GNUNET_OK ==
+     GNUNET_PROGRAM_run (argc, argv,
+                         "hostlist",
+                         _ ("GNUnet hostlist server and client"),
+                         options,
+                         &run, NULL)) ? 0 : 1;
+  GNUNET_free_nz ((void *) argv);
+  return ret;
+}
+
+
+/* end of gnunet-daemon-hostlist.c */