/**
* @file hostlist/hostlist-server.c
- * @author Christian Grothoff
+ * @author Christian Grothoff, Matthias Wachs
* @brief application to provide an integrated hostlist HTTP server
*/
#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_YES
-
-/**
- * How often should we recalculate our response to hostlist requests?
- */
-#define RESPONSE_UPDATE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
+#define DEBUG_HOSTLIST_SERVER GNUNET_NO
/**
* Handle to the HTTP server as provided by libmicrohttpd for IPv6.
*/
static struct GNUNET_STATISTICS_Handle *stats;
+/**
+ * Handle to the core service (NULL until we've connected to it).
+ */
+struct GNUNET_CORE_Handle *core;
+
+/**
+ * Handle to the peerinfo notify service (NULL until we've connected to it).
+ */
+struct GNUNET_PEERINFO_NotifyContext *notify;
+
/**
* Our primary task for IPv4.
*/
*/
static GNUNET_SCHEDULER_TaskIdentifier hostlist_task_v6;
-/**
- * Task that updates our HTTP response.
- */
-static GNUNET_SCHEDULER_TaskIdentifier response_task;
-
/**
* Our canonical response.
*/
*/
static struct GNUNET_PEERINFO_IteratorContext *pitr;
+/**
+ * Handle for accessing peerinfo service.
+ */
+static struct GNUNET_PEERINFO_Handle *peerinfo;
+
/**
* Context for host processor.
*/
struct HostSet
{
- size_t size;
+ unsigned int size;
char *data;
};
+/**
+ * Set if we are allowed to advertise our hostlist to others.
+ */
+static int advertising;
/**
- * Task that will produce a new response object.
+ * How many times was the hostlist advertised?
*/
-static void
-update_response (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc);
+static uint64_t hostlist_adv_count;
+
+/**
+ * Buffer for the hostlist address
+ */
+static char * hostlist_uri;
/**
static void
finish_response (struct HostSet *results)
{
- struct GNUNET_TIME_Relative freq;
-
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);
+ "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) )
- {
- freq = RESPONSE_UPDATE_FREQUENCY;
- if (results->size == 0)
- freq = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 250);
- /* schedule next update of the response */
- response_task = GNUNET_SCHEDULER_add_delayed (sched,
- freq,
- &update_response,
- NULL);
- }
- else
- {
- /* already past shutdown */
- MHD_destroy_response (response);
- response = NULL;
- }
+ 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);
+ 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).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.
struct HostSet *results = cls;
size_t old;
size_t s;
+ int has_addr;
if (peer == 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
"HELLO",
GNUNET_i2s (peer));
#endif
- if (old + s >= GNUNET_MAX_MALLOC_CHECKED)
- return; /* too large, skip! */
+ 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);
}
-/**
- * Task that will produce a new response object.
- */
-static void
-update_response (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct HostSet *results;
-
- response_task = GNUNET_SCHEDULER_NO_TASK;
- results = GNUNET_malloc(sizeof(struct HostSet));
- pitr = GNUNET_PEERINFO_iterate (cfg, sched,
- NULL,
- 0,
- GNUNET_TIME_UNIT_MINUTES,
- &host_processor,
- results);
-}
-
/**
* Hostlist access policy (very permissive, allows everything).
}
+/**
+ * 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)
+{
+ 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_set (stats,
+ gettext_noop("# hostlist advertisements send"),
+ hostlist_adv_count,
+ GNUNET_NO);
+ return transmission_size;
+}
+
+
+/**
+ * Method called whenever a given peer connects.
+ *
+ * @param cls closure
+ * @param peer peer identity this notification is about
+ * @param latency reported latency of the connection with 'other'
+ * @param distance reported distance (DV) to 'other'
+ */
+static void
+connect_handler (void *cls,
+ const struct
+ GNUNET_PeerIdentity * peer,
+ struct GNUNET_TIME_Relative latency,
+ uint32_t distance)
+{
+ 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,
+ 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 trust how much we trust the peer (not used)
+ */
+static void
+process_notify (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_HELLO_Message *hello,
+ uint32_t trust)
+{
+ struct HostSet *results;
+#if DEBUG_HOSTLIST_SERVER
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Peerinfo is notifying us to rebuild our hostlist\n");
+#endif
+ results = GNUNET_malloc(sizeof(struct HostSet));
+ GNUNET_assert (peerinfo != NULL);
+ pitr = GNUNET_PEERINFO_iterate (peerinfo,
+ NULL,
+ 0,
+ 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.
int
GNUNET_HOSTLIST_server_start (const struct GNUNET_CONFIGURATION_Handle *c,
struct GNUNET_SCHEDULER_Handle *s,
- struct GNUNET_STATISTICS_Handle *st)
+ 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");
sched = s;
cfg = c;
stats = st;
+ peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
+ if (peerinfo == NULL)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Could not access PEERINFO service. Exiting.\n"));
+ return GNUNET_SYSERR;
+ }
if (-1 == GNUNET_CONFIGURATION_get_value_number (cfg,
"HOSTLIST",
"HTTPPORT",
&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 port %llu\n"),
- port);
+ _("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
(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);
- response_task = GNUNET_SCHEDULER_add_now (sched,
- &update_response,
- NULL);
+
+ notify = GNUNET_PEERINFO_notify ( cfg, sched, process_notify, NULL);
+
return GNUNET_OK;
}
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 (sched, hostlist_task_v6);
GNUNET_PEERINFO_iterate_cancel (pitr);
pitr = NULL;
}
- if (GNUNET_SCHEDULER_NO_TASK != response_task)
- {
- GNUNET_SCHEDULER_cancel (sched, response_task);
- response_task = GNUNET_SCHEDULER_NO_TASK;
- }
if (NULL != daemon_handle_v4)
{
MHD_stop_daemon (daemon_handle_v4);
MHD_destroy_response (response);
response = NULL;
}
+ if (peerinfo != NULL)
+ {
+ GNUNET_PEERINFO_disconnect (peerinfo);
+ peerinfo = NULL;
+ }
+ cfg = NULL;
+ sched = NULL;
+ stats = NULL;
+ core = NULL;
}
/* end of hostlist-server.c */
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