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- /*
- 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 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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA.
- */
- /**
- * @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"
- #if HAVE_MHD
- #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;
- #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_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 == memcmp (&me,
- peer,
- sizeof (struct GNUNET_PeerIdentity)))
- 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 HAVE_MHD
- if (NULL != server_ch)
- GNUNET_assert (NULL ==
- (*server_ch) (cls,
- peer,
- mq));
- #endif
- 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 == memcmp (&me,
- peer,
- sizeof (struct GNUNET_PeerIdentity)))
- 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 HAVE_MHD
- if (provide_hostlist)
- {
- GNUNET_HOSTLIST_server_stop ();
- }
- #endif
- 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)
- #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);
- 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 HAVE_MHD
- if (provide_hostlist)
- GNUNET_HOSTLIST_server_start (cfg,
- stats,
- core,
- &server_ch,
- advertising);
- #endif
- 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[] = {
- #if HAVE_MHD
- GNUNET_GETOPT_option_flag ('a',
- "advertise",
- gettext_noop ("advertise our hostlist to other peers"),
- &advertising),
- #endif
- 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),
- #if HAVE_MHD
- GNUNET_GETOPT_option_flag ('p',
- "provide-hostlist",
- gettext_noop ("provide a hostlist server"),
- &provide_hostlist),
- #endif
- 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 ((void*) argv);
- return ret;
- }
- /* end of gnunet-daemon-hostlist.c */
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