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- /*
- This file is part of GNUnet.
- (C) 2008, 2009, 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 hostlist/hostlist-server.c
- * @author Christian Grothoff, Matthias Wachs
- * @brief application to provide an integrated hostlist HTTP server
- */
- #include "platform.h"
- #include <microhttpd.h>
- #include "hostlist-server.h"
- #include "gnunet_hello_lib.h"
- #include "gnunet_peerinfo_service.h"
- #include "gnunet-daemon-hostlist.h"
- #include "gnunet_resolver_service.h"
- #define DEBUG_HOSTLIST_SERVER GNUNET_NO
- /**
- * Handle to the HTTP server as provided by libmicrohttpd for IPv6.
- */
- static struct MHD_Daemon *daemon_handle_v6;
- /**
- * Handle to the HTTP server as provided by libmicrohttpd for IPv4.
- */
- static struct MHD_Daemon *daemon_handle_v4;
- /**
- * Our configuration.
- */
- static const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * For keeping statistics.
- */
- 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 peerinfo notify service (NULL until we've connected to it).
- */
- static struct GNUNET_PEERINFO_NotifyContext *notify;
- /**
- * Our primary task for IPv4.
- */
- static GNUNET_SCHEDULER_TaskIdentifier hostlist_task_v4;
- /**
- * Our primary task for IPv6.
- */
- static GNUNET_SCHEDULER_TaskIdentifier hostlist_task_v6;
- /**
- * Our canonical response.
- */
- static struct MHD_Response *response;
- /**
- * NULL if we are not currenlty iterating over peer information.
- */
- static struct GNUNET_PEERINFO_IteratorContext *pitr;
- /**
- * Handle for accessing peerinfo service.
- */
- static struct GNUNET_PEERINFO_Handle *peerinfo;
- /**
- * Context for host processor.
- */
- struct HostSet
- {
- unsigned int size;
- char *data;
- };
- /**
- * Set if we are allowed to advertise our hostlist to others.
- */
- static int advertising;
- /**
- * Buffer for the hostlist address
- */
- static char *hostlist_uri;
- /**
- * Function that assembles our response.
- */
- static void
- finish_response (struct HostSet *results)
- {
- if (response != NULL)
- MHD_destroy_response (response);
- #if DEBUG_HOSTLIST_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Creating hostlist response with %u bytes\n",
- (unsigned int) results->size);
- #endif
- response =
- MHD_create_response_from_data (results->size, results->data, MHD_YES,
- MHD_NO);
- if ((daemon_handle_v4 == NULL) && (daemon_handle_v6 == NULL))
- {
- MHD_destroy_response (response);
- response = NULL;
- }
- GNUNET_STATISTICS_set (stats, gettext_noop ("bytes in hostlist"),
- results->size, GNUNET_YES);
- GNUNET_free (results);
- }
- /**
- * Set 'cls' to GNUNET_YES (we have an address!).
- *
- * @param cls closure, an 'int*'
- * @param tname name of the transport (ignored)
- * @param expiration expiration time (call is ignored if this is in the past)
- * @param addr the address (ignored)
- * @param addrlen length of the address (ignored)
- * @return GNUNET_SYSERR to stop iterating (unless expiration has occured)
- */
- static int
- check_has_addr (void *cls, const char *tname,
- struct GNUNET_TIME_Absolute expiration, const void *addr,
- uint16_t addrlen)
- {
- int *arg = cls;
- if (GNUNET_TIME_absolute_get_remaining (expiration).rel_value == 0)
- {
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("expired addresses encountered"), 1,
- GNUNET_YES);
- return GNUNET_YES; /* ignore this address */
- }
- *arg = GNUNET_YES;
- return GNUNET_SYSERR;
- }
- /**
- * Callback that processes each of the known HELLOs for the
- * hostlist response construction.
- */
- static void
- host_processor (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_HELLO_Message *hello, const char *err_msg)
- {
- struct HostSet *results = cls;
- size_t old;
- size_t s;
- int has_addr;
- if (err_msg != NULL)
- {
- GNUNET_assert (NULL == peer);
- pitr = NULL;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Error in communication with PEERINFO service: %s\n"),
- err_msg);
- return;
- }
- if (peer == NULL)
- {
- pitr = NULL;
- finish_response (results);
- return;
- }
- if (hello == NULL)
- return;
- has_addr = GNUNET_NO;
- GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO, &check_has_addr, &has_addr);
- if (GNUNET_NO == has_addr)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "HELLO for peer `%4s' has no address, not suitable for hostlist!\n",
- GNUNET_i2s (peer));
- GNUNET_STATISTICS_update (stats,
- gettext_noop
- ("HELLOs without addresses encountered (ignored)"),
- 1, GNUNET_NO);
- return;
- }
- old = results->size;
- s = GNUNET_HELLO_size (hello);
- #if DEBUG_HOSTLIST_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received %u bytes of `%s' from peer `%s' for hostlist.\n",
- (unsigned int) s, "HELLO", GNUNET_i2s (peer));
- #endif
- if ((old + s >= GNUNET_MAX_MALLOC_CHECKED) ||
- (old + s >= MAX_BYTES_PER_HOSTLISTS))
- {
- GNUNET_STATISTICS_update (stats,
- gettext_noop
- ("bytes not included in hostlist (size limit)"),
- s, GNUNET_NO);
- return; /* too large, skip! */
- }
- #if DEBUG_HOSTLIST_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Adding peer `%s' to hostlist (%u bytes)\n", GNUNET_i2s (peer),
- (unsigned int) s);
- #endif
- GNUNET_array_grow (results->data, results->size, old + s);
- memcpy (&results->data[old], hello, s);
- }
- /**
- * Hostlist access policy (very permissive, allows everything).
- */
- static int
- accept_policy_callback (void *cls, const struct sockaddr *addr,
- socklen_t addrlen)
- {
- if (NULL == response)
- {
- #if DEBUG_HOSTLIST_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received request for hostlist, but I am not yet ready; rejecting!\n");
- #endif
- return MHD_NO;
- }
- return MHD_YES; /* accept all */
- }
- /**
- * Main request handler.
- */
- static int
- access_handler_callback (void *cls, struct MHD_Connection *connection,
- const char *url, const char *method,
- const char *version, const char *upload_data,
- size_t * upload_data_size, void **con_cls)
- {
- static int dummy;
- if (0 != strcmp (method, MHD_HTTP_METHOD_GET))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Refusing `%s' request to hostlist server\n"), method);
- GNUNET_STATISTICS_update (stats,
- gettext_noop
- ("hostlist requests refused (not HTTP GET)"), 1,
- GNUNET_YES);
- return MHD_NO;
- }
- if (NULL == *con_cls)
- {
- (*con_cls) = &dummy;
- #if DEBUG_HOSTLIST_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, _("Sending 100 CONTINUE reply\n"));
- #endif
- return MHD_YES; /* send 100 continue */
- }
- if (*upload_data_size != 0)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Refusing `%s' request with %llu bytes of upload data\n"),
- method, (unsigned long long) *upload_data_size);
- GNUNET_STATISTICS_update (stats,
- gettext_noop
- ("hostlist requests refused (upload data)"), 1,
- GNUNET_YES);
- return MHD_NO; /* do not support upload data */
- }
- if (response == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _
- ("Could not handle hostlist request since I do not have a response yet\n"));
- GNUNET_STATISTICS_update (stats,
- gettext_noop
- ("hostlist requests refused (not ready)"), 1,
- GNUNET_YES);
- return MHD_NO; /* internal error, no response yet */
- }
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received request for our hostlist\n"));
- GNUNET_STATISTICS_update (stats, gettext_noop ("hostlist requests processed"),
- 1, GNUNET_YES);
- return MHD_queue_response (connection, MHD_HTTP_OK, response);
- }
- /**
- * Handler called by core when core is ready to transmit message
- * @param cls closure
- * @param size size of buffer to copy message to
- * @param buf buffer to copy message to
- */
- static size_t
- adv_transmit_ready (void *cls, size_t size, void *buf)
- {
- static uint64_t hostlist_adv_count;
- size_t transmission_size;
- size_t uri_size; /* Including \0 termination! */
- struct GNUNET_MessageHeader header;
- char *cbuf;
- if (buf == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmission failed, buffer invalid!\n");
- return 0;
- }
- uri_size = strlen (hostlist_uri) + 1;
- transmission_size = sizeof (struct GNUNET_MessageHeader) + uri_size;
- header.type = htons (GNUNET_MESSAGE_TYPE_HOSTLIST_ADVERTISEMENT);
- header.size = htons (transmission_size);
- GNUNET_assert (size >= transmission_size);
- memcpy (buf, &header, sizeof (struct GNUNET_MessageHeader));
- cbuf = buf;
- memcpy (&cbuf[sizeof (struct GNUNET_MessageHeader)], hostlist_uri, uri_size);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Sent advertisement message: Copied %u bytes into buffer!\n",
- (unsigned int) transmission_size);
- hostlist_adv_count++;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " # Sent advertisement message: %u\n",
- hostlist_adv_count);
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# hostlist advertisements send"), 1,
- GNUNET_NO);
- return transmission_size;
- }
- /**
- * Method called whenever a given peer connects.
- *
- * @param cls closure
- * @param peer peer identity this notification is about
- * @param atsi performance data
- */
- static void
- connect_handler (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_TRANSPORT_ATS_Information *atsi)
- {
- size_t size;
- if (!advertising)
- return;
- if (hostlist_uri == NULL)
- return;
- size = strlen (hostlist_uri) + 1;
- if (size + sizeof (struct GNUNET_MessageHeader) >=
- GNUNET_SERVER_MAX_MESSAGE_SIZE)
- {
- GNUNET_break (0);
- return;
- }
- size += sizeof (struct GNUNET_MessageHeader);
- if (NULL == core)
- {
- GNUNET_break (0);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Asked core to transmit advertisement message with a size of %u bytes to peer `%s'\n",
- size, GNUNET_i2s (peer));
- if (NULL ==
- GNUNET_CORE_notify_transmit_ready (core, GNUNET_YES, 0,
- GNUNET_ADV_TIMEOUT, peer, size,
- &adv_transmit_ready, NULL))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Advertisement message could not be queued by core\n"));
- }
- }
- /**
- * Method called whenever a given peer disconnects.
- *
- * @param cls closure
- * @param peer peer identity this notification is about
- */
- static void
- disconnect_handler (void *cls, const struct GNUNET_PeerIdentity *peer)
- {
- /* nothing to do */
- }
- /**
- * PEERINFO calls this function to let us know about a possible peer
- * that we might want to connect to.
- *
- * @param cls closure (not used)
- * @param peer potential peer to connect to
- * @param hello HELLO for this peer (or NULL)
- * @param err_msg NULL if successful, otherwise contains error message
- */
- static void
- process_notify (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_HELLO_Message *hello, const char *err_msg)
- {
- struct HostSet *results;
- #if DEBUG_HOSTLIST_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Peerinfo is notifying us to rebuild our hostlist\n");
- #endif
- if (err_msg != NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Error in communication with PEERINFO service\n"));
- /* return; */
- }
- results = GNUNET_malloc (sizeof (struct HostSet));
- GNUNET_assert (peerinfo != NULL);
- pitr =
- GNUNET_PEERINFO_iterate (peerinfo, NULL, GNUNET_TIME_UNIT_MINUTES,
- &host_processor, results);
- }
- /**
- * Function that queries MHD's select sets and
- * starts the task waiting for them.
- */
- static GNUNET_SCHEDULER_TaskIdentifier
- prepare_daemon (struct MHD_Daemon *daemon_handle);
- /**
- * Call MHD to process pending requests and then go back
- * and schedule the next run.
- */
- static void
- run_daemon (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- struct MHD_Daemon *daemon_handle = cls;
- if (daemon_handle == daemon_handle_v4)
- hostlist_task_v4 = GNUNET_SCHEDULER_NO_TASK;
- else
- hostlist_task_v6 = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- return;
- GNUNET_assert (MHD_YES == MHD_run (daemon_handle));
- if (daemon_handle == daemon_handle_v4)
- hostlist_task_v4 = prepare_daemon (daemon_handle);
- else
- hostlist_task_v6 = prepare_daemon (daemon_handle);
- }
- /**
- * Function that queries MHD's select sets and
- * starts the task waiting for them.
- */
- static GNUNET_SCHEDULER_TaskIdentifier
- prepare_daemon (struct MHD_Daemon *daemon_handle)
- {
- GNUNET_SCHEDULER_TaskIdentifier ret;
- fd_set rs;
- fd_set ws;
- fd_set es;
- struct GNUNET_NETWORK_FDSet *wrs;
- struct GNUNET_NETWORK_FDSet *wws;
- struct GNUNET_NETWORK_FDSet *wes;
- int max;
- unsigned long long timeout;
- int haveto;
- struct GNUNET_TIME_Relative tv;
- FD_ZERO (&rs);
- FD_ZERO (&ws);
- FD_ZERO (&es);
- wrs = GNUNET_NETWORK_fdset_create ();
- wes = GNUNET_NETWORK_fdset_create ();
- wws = GNUNET_NETWORK_fdset_create ();
- max = -1;
- GNUNET_assert (MHD_YES == MHD_get_fdset (daemon_handle, &rs, &ws, &es, &max));
- haveto = MHD_get_timeout (daemon_handle, &timeout);
- if (haveto == MHD_YES)
- tv.rel_value = (uint64_t) timeout;
- else
- tv = GNUNET_TIME_UNIT_FOREVER_REL;
- GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
- GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
- GNUNET_NETWORK_fdset_copy_native (wes, &es, max + 1);
- ret =
- GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_HIGH,
- GNUNET_SCHEDULER_NO_TASK, tv, wrs, wws,
- &run_daemon, daemon_handle);
- GNUNET_NETWORK_fdset_destroy (wrs);
- GNUNET_NETWORK_fdset_destroy (wws);
- GNUNET_NETWORK_fdset_destroy (wes);
- return ret;
- }
- /**
- * Start server offering our hostlist.
- *
- * @return GNUNET_OK on success
- */
- int
- GNUNET_HOSTLIST_server_start (const struct GNUNET_CONFIGURATION_Handle *c,
- struct GNUNET_STATISTICS_Handle *st,
- struct GNUNET_CORE_Handle *co,
- GNUNET_CORE_ConnectEventHandler *server_ch,
- GNUNET_CORE_DisconnectEventHandler *server_dh,
- int advertise)
- {
- unsigned long long port;
- char *hostname;
- size_t size;
- advertising = advertise;
- if (!advertising)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Advertising not enabled on this hostlist server\n");
- else
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Advertising enabled on this hostlist server\n");
- cfg = c;
- stats = st;
- peerinfo = GNUNET_PEERINFO_connect (cfg);
- if (peerinfo == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Could not access PEERINFO service. Exiting.\n"));
- return GNUNET_SYSERR;
- }
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (cfg, "HOSTLIST", "HTTPPORT",
- &port))
- return GNUNET_SYSERR;
- if ((port == 0) || (port > UINT16_MAX))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Invalid port number %llu. Exiting.\n"), port);
- return GNUNET_SYSERR;
- }
- if (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "HOSTLIST",
- "EXTERNAL_DNS_NAME", &hostname))
- hostname = GNUNET_RESOLVER_local_fqdn_get ();
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Hostlist service starts on %s:%llu\n"),
- hostname, port);
- if (NULL != hostname)
- {
- size = strlen (hostname);
- if (size + 15 > MAX_URL_LEN)
- {
- GNUNET_break (0);
- }
- else
- {
- GNUNET_asprintf (&hostlist_uri, "http://%s:%u/", hostname,
- (unsigned int) port);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("Address to obtain hostlist: `%s'\n"), hostlist_uri);
- }
- GNUNET_free (hostname);
- }
- daemon_handle_v6 = MHD_start_daemon (MHD_USE_IPv6
- #if DEBUG_HOSTLIST_SERVER
- | MHD_USE_DEBUG
- #endif
- , (unsigned short) port,
- &accept_policy_callback, NULL,
- &access_handler_callback, NULL,
- MHD_OPTION_CONNECTION_LIMIT,
- (unsigned int) 16,
- MHD_OPTION_PER_IP_CONNECTION_LIMIT,
- (unsigned int) 1,
- MHD_OPTION_CONNECTION_TIMEOUT,
- (unsigned int) 16,
- MHD_OPTION_CONNECTION_MEMORY_LIMIT,
- (size_t) (16 * 1024), MHD_OPTION_END);
- daemon_handle_v4 = MHD_start_daemon (MHD_NO_FLAG
- #if DEBUG_HOSTLIST_SERVER
- | MHD_USE_DEBUG
- #endif
- , (unsigned short) port,
- &accept_policy_callback, NULL,
- &access_handler_callback, NULL,
- MHD_OPTION_CONNECTION_LIMIT,
- (unsigned int) 16,
- MHD_OPTION_PER_IP_CONNECTION_LIMIT,
- (unsigned int) 1,
- MHD_OPTION_CONNECTION_TIMEOUT,
- (unsigned int) 16,
- MHD_OPTION_CONNECTION_MEMORY_LIMIT,
- (size_t) (16 * 1024), MHD_OPTION_END);
- if ((daemon_handle_v6 == NULL) && (daemon_handle_v4 == NULL))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Could not start hostlist HTTP server on port %u\n"),
- (unsigned short) port);
- return GNUNET_SYSERR;
- }
- core = co;
- *server_ch = &connect_handler;
- *server_dh = &disconnect_handler;
- if (daemon_handle_v4 != NULL)
- hostlist_task_v4 = prepare_daemon (daemon_handle_v4);
- if (daemon_handle_v6 != NULL)
- hostlist_task_v6 = prepare_daemon (daemon_handle_v6);
- notify = GNUNET_PEERINFO_notify (cfg, process_notify, NULL);
- return GNUNET_OK;
- }
- /**
- * Stop server offering our hostlist.
- */
- void
- GNUNET_HOSTLIST_server_stop ()
- {
- #if DEBUG_HOSTLIST_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Hostlist server shutdown\n");
- #endif
- if (NULL != notify)
- {
- GNUNET_PEERINFO_notify_cancel (notify);
- notify = NULL;
- }
- if (GNUNET_SCHEDULER_NO_TASK != hostlist_task_v6)
- {
- GNUNET_SCHEDULER_cancel (hostlist_task_v6);
- hostlist_task_v6 = GNUNET_SCHEDULER_NO_TASK;
- }
- if (GNUNET_SCHEDULER_NO_TASK != hostlist_task_v4)
- {
- GNUNET_SCHEDULER_cancel (hostlist_task_v4);
- hostlist_task_v4 = GNUNET_SCHEDULER_NO_TASK;
- }
- if (pitr != NULL)
- {
- GNUNET_PEERINFO_iterate_cancel (pitr);
- pitr = NULL;
- }
- if (NULL != daemon_handle_v4)
- {
- MHD_stop_daemon (daemon_handle_v4);
- daemon_handle_v4 = NULL;
- }
- if (NULL != daemon_handle_v6)
- {
- MHD_stop_daemon (daemon_handle_v6);
- daemon_handle_v6 = NULL;
- }
- if (response != NULL)
- {
- MHD_destroy_response (response);
- response = NULL;
- }
- if (peerinfo != NULL)
- {
- GNUNET_PEERINFO_disconnect (peerinfo);
- peerinfo = NULL;
- }
- cfg = NULL;
- stats = NULL;
- core = NULL;
- }
- /* end of hostlist-server.c */
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