1 files changed, 347 insertions, 0 deletions
diff --git a/src/hostlist/gnunet-daemon-hostlist.c b/src/hostlist/gnunet-daemon-hostlist.c
new file mode 100644
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--- /dev/null
+++ b/src/hostlist/gnunet-daemon-hostlist.c
@@ -0,0 +1,347 @@
+/*
+     This file is part of GNUnet.
+     (C) 2007, 2008, 2009 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 hostlist/gnunet-daemon-hostlist.c
+ * @brief code for bootstrapping via hostlist servers
+ * @author Christian Grothoff
+ */
+
+#include <stdlib.h>
+#include "platform.h"
+#include "hostlist-client.h"
+#include "gnunet_core_service.h"
+#include "gnunet_getopt_lib.h"
+#include "gnunet_protocols.h"
+#include "gnunet_program_lib.h"
+#include "gnunet_statistics_service.h"
+#include "gnunet_strings_lib.h"
+#include "gnunet_time_lib.h"
+#include "gnunet_util_lib.h"
+
+#if HAVE_MHD
+
+#include "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;
+
+/**
+ * Handle to hostlist server's disconnect handler
+ */
+static GNUNET_CORE_DisconnectEventHandler server_dh;
+
+#endif
+
+/**
+ * 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_CORE_MessageCallback 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
+
+static struct GNUNET_PeerIdentity me;
+
+static void
+core_init (void *cls, struct GNUNET_CORE_Handle *server,
+           const struct GNUNET_PeerIdentity *my_identity)
+{
+  me = *my_identity;
+}
+
+/**
+ * Core handler for p2p hostlist advertisements
+ *
+ * @param cls closure
+ * @param peer identity of the sender
+ * @param message advertisement message we got
+ * @param atsi performance information
+ * @param atsi_count number of records in 'atsi'
+ * @return GNUNET_OK on success
+ */
+static int
+advertisement_handler (void *cls, const struct GNUNET_PeerIdentity *peer,
+                       const struct GNUNET_MessageHeader *message,
+                       const struct GNUNET_ATS_Information *atsi,
+                       unsigned int atsi_count)
+{
+  GNUNET_assert (NULL != client_adv_handler);
+  return (*client_adv_handler) (cls, peer, message, atsi, atsi_count);
+}
+
+
+/**
+ * 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 atsi performance data
+ * @param atsi_count number of records in 'atsi'
+ */
+static void
+connect_handler (void *cls, const struct GNUNET_PeerIdentity *peer,
+                 const struct GNUNET_ATS_Information *atsi,
+                 unsigned int atsi_count)
+{
+  if (0 == memcmp (&me, peer, sizeof (struct GNUNET_PeerIdentity)))
+    return;
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "A new peer connected, notifying client and server\n");
+  if (NULL != client_ch)
+    (*client_ch) (cls, peer, atsi, atsi_count);
+#if HAVE_MHD
+  if (NULL != server_ch)
+    (*server_ch) (cls, peer, atsi, atsi_count);
+#endif
+}
+
+/**
+ * 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)
+{
+  if (0 == memcmp (&me, peer, sizeof (struct GNUNET_PeerIdentity)))
+    return;
+  /* call hostlist client disconnect handler */
+  if (NULL != client_dh)
+    (*client_dh) (cls, peer);
+#if HAVE_MHD
+  /* call hostlist server disconnect handler */
+  if (NULL != server_dh)
+    (*server_dh) (cls, peer);
+#endif
+}
+
+/**
+ * Last task run during shutdown.  Disconnects us from
+ * the other services.
+ */
+static void
+cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Hostlist daemon is shutting down\n");
+  if (core != NULL)
+  {
+    GNUNET_CORE_disconnect (core);
+    core = NULL;
+  }
+  if (bootstrapping)
+  {
+    GNUNET_HOSTLIST_client_stop ();
+  }
+#if HAVE_MHD
+  if (provide_hostlist)
+  {
+    GNUNET_HOSTLIST_server_stop ();
+  }
+#endif
+  if (stats != NULL)
+  {
+    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)
+{
+  static const struct GNUNET_CORE_MessageHandler learn_handlers[] = {
+    {&advertisement_handler, GNUNET_MESSAGE_TYPE_HOSTLIST_ADVERTISEMENT, 0},
+    {NULL, 0, 0}
+  };
+  static const struct GNUNET_CORE_MessageHandler no_learn_handlers[] = {
+    {NULL, 0, 0}
+  };
+  if ((!bootstrapping) && (!learning)
+#if HAVE_MHD
+      && (!provide_hostlist)
+#endif
+      )
+  {
+    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);
+
+  core =
+      GNUNET_CORE_connect (cfg, 1, NULL, &core_init, &connect_handler,
+                           &disconnect_handler, NULL, GNUNET_NO, NULL,
+                           GNUNET_NO,
+                           learning ? learn_handlers : no_learn_handlers);
+
+  if (bootstrapping)
+  {
+    GNUNET_HOSTLIST_client_start (cfg, stats, &client_ch, &client_dh,
+                                  &client_adv_handler, learning);
+  }
+
+#if HAVE_MHD
+  if (provide_hostlist)
+  {
+    GNUNET_HOSTLIST_server_start (cfg, stats, core, &server_ch, &server_dh,
+                                  advertising);
+  }
+#endif
+  GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &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)
+{
+  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
+#if HAVE_MHD
+    {'a', "advertise", NULL,
+     gettext_noop ("advertise our hostlist to other peers"),
+     GNUNET_NO, &GNUNET_GETOPT_set_one, &advertising},
+#endif
+    {'b', "bootstrap", NULL,
+     gettext_noop
+     ("bootstrap using hostlists (it is highly recommended that you always use this option)"),
+     GNUNET_NO, &GNUNET_GETOPT_set_one, &bootstrapping},
+    {'e', "enable-learning", NULL,
+     gettext_noop ("enable learning about hostlist servers from other peers"),
+     GNUNET_NO, &GNUNET_GETOPT_set_one, &learning},
+#if HAVE_MHD
+    {'p', "provide-hostlist", NULL,
+     gettext_noop ("provide a hostlist server"),
+     GNUNET_NO, &GNUNET_GETOPT_set_one, &provide_hostlist},
+#endif
+    GNUNET_GETOPT_OPTION_END
+  };
+
+  int ret;
+
+  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;
+
+  return ret;
+}
+
+/* end of gnunet-daemon-hostlist.c */