/**
* @file regex/gnunet-service-regex.c
- * @brief program that tracks template
+ * @brief service to advertise capabilities described as regex and to
+ * lookup capabilities by regex
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
-#include "gnunet_regex_lib.h"
+#include "regex_internal_lib.h"
#include "regex_ipc.h"
+
+/**
+ * Information about one of our clients.
+ */
+struct ClientEntry
+{
+
+ /**
+ * Kept in DLL.
+ */
+ struct ClientEntry *next;
+
+ /**
+ * Kept in DLL.
+ */
+ struct ClientEntry *prev;
+
+ /**
+ * Handle identifying the client.
+ */
+ struct GNUNET_SERVER_Client *client;
+
+ /**
+ * Search handle (if this client is searching).
+ */
+ struct REGEX_INTERNAL_Search *sh;
+
+ /**
+ * Announcement handle (if this client is announcing).
+ */
+ struct REGEX_INTERNAL_Announcement *ah;
+
+ /**
+ * Refresh frequency for announcements.
+ */
+ struct GNUNET_TIME_Relative frequency;
+
+ /**
+ * Task for re-announcing.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier refresh_task;
+
+};
+
+
+/**
+ * Connection to the DHT.
+ */
+static struct GNUNET_DHT_Handle *dht;
+
+/**
+ * Handle for doing statistics.
+ */
+static struct GNUNET_STATISTICS_Handle *stats;
+
+/**
+ * Head of list of clients.
+ */
+static struct ClientEntry *client_head;
+
+/**
+ * End of list of clients.
+ */
+static struct ClientEntry *client_tail;
+
+/**
+ * Our notification context, used to send back results to the client.
+ */
+static struct GNUNET_SERVER_NotificationContext *nc;
+
+/**
+ * Private key for this peer.
+ */
+static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
+
+
/**
* Task run during shutdown.
*
static void
cleanup_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- /* FIXME: do clean up here */
+ GNUNET_DHT_disconnect (dht);
+ dht = NULL;
+ GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
+ stats = NULL;
+ GNUNET_SERVER_notification_context_destroy (nc);
+ nc = NULL;
+ GNUNET_free (my_private_key);
+ my_private_key = NULL;
+}
+
+
+/**
+ * A client disconnected. Remove all of its data structure entries.
+ *
+ * @param cls closure, NULL
+ * @param client identification of the client
+ */
+static void
+handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
+{
+ struct ClientEntry *ce;
+ struct ClientEntry *nx;
+
+ nx = client_head;
+ for (ce = nx; NULL != ce; ce = nx)
+ {
+ nx = ce->next;
+ if (ce->client == client)
+ {
+ if (GNUNET_SCHEDULER_NO_TASK != ce->refresh_task)
+ {
+ GNUNET_SCHEDULER_cancel (ce->refresh_task);
+ ce->refresh_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (NULL != ce->ah)
+ {
+ REGEX_INTERNAL_announce_cancel (ce->ah);
+ ce->ah = NULL;
+ }
+ if (NULL != ce->sh)
+ {
+ REGEX_INTERNAL_search_cancel (ce->sh);
+ ce->sh = NULL;
+ }
+ GNUNET_CONTAINER_DLL_remove (client_head, client_tail, ce);
+ GNUNET_free (ce);
+ }
+ }
+}
+
+
+/**
+ * Periodic task to refresh our announcement of the regex.
+ *
+ * @param cls the 'struct ClientEntry' of the client that triggered the
+ * announcement
+ * @param tc scheduler context
+ */
+static void
+reannounce (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct ClientEntry *ce = cls;
+
+ REGEX_INTERNAL_reannounce (ce->ah);
+ ce->refresh_task = GNUNET_SCHEDULER_add_delayed (ce->frequency,
+ &reannounce,
+ ce);
+}
+
+
+/**
+ * Handle ANNOUNCE message.
+ *
+ * @param cls closure
+ * @param client identification of the client
+ * @param message the actual message
+ */
+static void
+handle_announce (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ const struct AnnounceMessage *am;
+ const char *regex;
+ struct ClientEntry *ce;
+ uint16_t size;
+
+ size = ntohs (message->size);
+ am = (const struct AnnounceMessage *) message;
+ regex = (const char *) &am[1];
+ if ( (size <= sizeof (struct AnnounceMessage)) ||
+ ('\0' != regex[size - sizeof (struct AnnounceMessage) - 1]) )
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+
+ ce = GNUNET_new (struct ClientEntry);
+ ce->client = client;
+ ce->frequency = GNUNET_TIME_relative_ntoh (am->refresh_delay);
+ ce->refresh_task = GNUNET_SCHEDULER_add_delayed (ce->frequency,
+ &reannounce,
+ ce);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Starting to announce regex `%s' every %s\n",
+ regex,
+ GNUNET_STRINGS_relative_time_to_string (ce->frequency,
+ GNUNET_NO));
+ ce->ah = REGEX_INTERNAL_announce (dht,
+ my_private_key,
+ regex,
+ ntohs (am->compression),
+ stats);
+ if (NULL == ce->ah)
+ {
+ GNUNET_break (0);
+ GNUNET_SCHEDULER_cancel (ce->refresh_task);
+ GNUNET_free (ce);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ GNUNET_CONTAINER_DLL_insert (client_head,
+ client_tail,
+ ce);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+}
+
+
+/**
+ * Handle result, pass it back to the client.
+ *
+ * @param cls the struct ClientEntry of the client searching
+ * @param id Peer providing a regex that matches the string.
+ * @param get_path Path of the get request.
+ * @param get_path_length Lenght of get_path.
+ * @param put_path Path of the put request.
+ * @param put_path_length Length of the put_path.
+ */
+static void
+handle_search_result (void *cls,
+ const struct GNUNET_PeerIdentity *id,
+ const struct GNUNET_PeerIdentity *get_path,
+ unsigned int get_path_length,
+ const struct GNUNET_PeerIdentity *put_path,
+ unsigned int put_path_length)
+{
+ struct ClientEntry *ce = cls;
+ struct ResultMessage *result;
+ struct GNUNET_PeerIdentity *gp;
+ uint16_t size;
+
+ if ( (get_path_length >= 65536) ||
+ (put_path_length >= 65536) ||
+ ( (get_path_length + put_path_length) * sizeof (struct GNUNET_PeerIdentity))
+ + sizeof (struct ResultMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ size = (get_path_length + put_path_length) * sizeof (struct GNUNET_PeerIdentity) + sizeof (struct ResultMessage);
+ result = GNUNET_malloc (size);
+ result->header.size = htons (size);
+ result->header.type = htons (GNUNET_MESSAGE_TYPE_REGEX_RESULT);
+ result->get_path_length = htons ((uint16_t) get_path_length);
+ result->put_path_length = htons ((uint16_t) put_path_length);
+ result->id = *id;
+ gp = &result->id;
+ memcpy (&gp[1],
+ get_path,
+ get_path_length * sizeof (struct GNUNET_PeerIdentity));
+ memcpy (&gp[1 + get_path_length],
+ put_path,
+ put_path_length * sizeof (struct GNUNET_PeerIdentity));
+ GNUNET_SERVER_notification_context_unicast (nc,
+ ce->client,
+ &result->header, GNUNET_NO);
+ GNUNET_free (result);
+}
+
+
+/**
+ * Handle SEARCH message.
+ *
+ * @param cls closure
+ * @param client identification of the client
+ * @param message the actual message
+ */
+static void
+handle_search (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ const struct SearchMessage *sm;
+ const char *string;
+ struct ClientEntry *ce;
+ uint16_t size;
+
+ size = ntohs (message->size);
+ sm = (const struct SearchMessage *) message;
+ string = (const char *) &sm[1];
+ if ( (size <= sizeof (struct SearchMessage)) ||
+ ('\0' != string[size - sizeof (struct SearchMessage) - 1]) )
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ ce = GNUNET_new (struct ClientEntry);
+ ce->client = client;
+ ce->sh = REGEX_INTERNAL_search (dht,
+ string,
+ &handle_search_result,
+ ce,
+ stats);
+ if (NULL == ce->sh)
+ {
+ GNUNET_break (0);
+ GNUNET_free (ce);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ GNUNET_CONTAINER_DLL_insert (client_head,
+ client_tail,
+ ce);
+ GNUNET_SERVER_notification_context_add (nc, client);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
}
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
static const struct GNUNET_SERVER_MessageHandler handlers[] = {
- /* FIXME: add handlers here! */
+ {&handle_announce, NULL, GNUNET_MESSAGE_TYPE_REGEX_ANNOUNCE, 0},
+ {&handle_search, NULL, GNUNET_MESSAGE_TYPE_REGEX_SEARCH, 0},
{NULL, NULL, 0, 0}
};
- /* FIXME: do setup here */
- GNUNET_SERVER_add_handlers (server, handlers);
+
+ my_private_key = GNUNET_CRYPTO_eddsa_key_create_from_configuration (cfg);
+ if (NULL == my_private_key)
+ {
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ dht = GNUNET_DHT_connect (cfg, 1024);
+ if (NULL == dht)
+ {
+ GNUNET_free (my_private_key);
+ my_private_key = NULL;
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup_task,
NULL);
+ nc = GNUNET_SERVER_notification_context_create (server, 1);
+ stats = GNUNET_STATISTICS_create ("regex", cfg);
+ GNUNET_SERVER_add_handlers (server, handlers);
+ GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
}
projects / oweals / gnunet.git / blobdiff