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[GNUnet-SVN] r33808 - gnunet/src/transport


From: gnunet
Subject: [GNUnet-SVN] r33808 - gnunet/src/transport
Date: Mon, 23 Jun 2014 23:48:38 +0200

Author: grothoff
Date: 2014-06-23 23:48:38 +0200 (Mon, 23 Jun 2014)
New Revision: 33808

Modified:
   gnunet/src/transport/
   gnunet/src/transport/plugin_transport_http_server.c
   gnunet/src/transport/test_transport_api_http_reverse_peer1.conf
   gnunet/src/transport/test_transport_api_http_reverse_peer2.conf
   gnunet/src/transport/transport-testing.c
   gnunet/src/transport/transport.conf.in
Log:
-drastically simplify http server session cleanup (and startup) logic

Index: gnunet/src/transport
===================================================================
--- gnunet/src/transport        2014-06-23 21:40:20 UTC (rev 33807)
+++ gnunet/src/transport        2014-06-23 21:48:38 UTC (rev 33808)

Property changes on: gnunet/src/transport
___________________________________________________________________
Modified: svn:ignore
## -1,3 +1,5 ##
+test_transport_api_monitor_validation
+test_transport_api_monitor_peers
 test_transport_api_reliability_unix
 test_transport_address_switch_udp
 test_transport_address_switch_tcp
Modified: gnunet/src/transport/plugin_transport_http_server.c
===================================================================
--- gnunet/src/transport/plugin_transport_http_server.c 2014-06-23 21:40:20 UTC 
(rev 33807)
+++ gnunet/src/transport/plugin_transport_http_server.c 2014-06-23 21:48:38 UTC 
(rev 33808)
@@ -54,243 +54,248 @@
 
 
 /**
- * Session handle for connections.
+ * Information we keep with MHD for an HTTP request.
  */
-struct Session
+struct ServerConnection
 {
   /**
-   * Stored in a linked list.
+   * The session this server connection belongs to
    */
-  struct Session *next;
+  struct Session *session;
 
   /**
-   * Stored in a linked list.
+   * The MHD connection
    */
-  struct Session *prev;
+  struct MHD_Connection *mhd_conn;
 
   /**
-   * To whom are we talking to (set to our identity
-   * if we are still waiting for the welcome message)
+   * The MHD daemon
    */
-  struct GNUNET_PeerIdentity target;
+  struct MHD_Daemon *mhd_daemon;
 
   /**
-   * Pointer to the global plugin struct.
+   * Options requested by peer
    */
-  struct HTTP_Server_Plugin *plugin;
+  uint32_t options;
+#define OPTION_LONG_POLL 1 /* GET request wants long-poll semantics */
 
   /**
-   * next pointer for double linked list
+   * _RECV or _SEND
    */
-  struct HTTP_Message *msg_head;
+  int direction;
 
   /**
-   * previous pointer for double linked list
+   * For PUT connections: Is this the first or last callback with size 0
+   * For GET connections: Have we sent a message
    */
-  struct HTTP_Message *msg_tail;
+  int connected;
 
+};
+
+
+/**
+ * Wrapper to manage addresses
+ */
+struct HttpAddressWrapper
+{
   /**
-   * Message stream tokenizer for incoming data
+   * Linked list next
    */
-  struct GNUNET_SERVER_MessageStreamTokenizer *msg_tk;
+  struct HttpAddressWrapper *next;
 
   /**
-   * Client recv handle
+   * Linked list previous
    */
-  struct ServerConnection *server_recv;
+  struct HttpAddressWrapper *prev;
 
   /**
-   * Client send handle
+   * An address we are using.
    */
-  struct ServerConnection *server_send;
+  struct HttpAddress *address;
 
   /**
-   * Address
+   * Length of the address.
    */
-  struct GNUNET_HELLO_Address *address;
+  size_t addrlen;
+};
 
+
+/**
+ *  Message to send using http
+ */
+struct HTTP_Message
+{
   /**
-   * Unique HTTP/S connection tag for this connection
+   * next pointer for double linked list
    */
-  uint32_t tag;
+  struct HTTP_Message *next;
 
   /**
-   * ATS network type in NBO
+   * previous pointer for double linked list
    */
-  uint32_t ats_address_network_type;
+  struct HTTP_Message *prev;
 
   /**
-   * Was session given to transport service?
+   * buffer containing data to send
    */
-  int session_passed;
+  char *buf;
 
   /**
-   * Did we immediately end the session in disconnect_cb
+   * amount of data already sent
    */
-  int session_ended;
+  size_t pos;
 
   /**
-   * Absolute time when to receive data again
-   * Used for receive throttling
+   * buffer length
    */
-  struct GNUNET_TIME_Absolute next_receive;
+  size_t size;
 
   /**
-   * Session timeout task
+   * HTTP/S specific overhead
    */
-  GNUNET_SCHEDULER_TaskIdentifier timeout_task;
+  size_t overhead;
 
   /**
-   * Should this session get disconnected? GNUNET_YES/NO
+   * Continuation function to call once the transmission buffer
+   * has again space available.  NULL if there is no
+   * continuation to call.
    */
-  int disconnect;
+  GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
+
+  /**
+   * Closure for transmit_cont.
+   */
+  void *transmit_cont_cls;
 };
 
 
-struct ServerConnection
+/**
+ * Session handle for connections.
+ */
+struct Session
 {
-  /**
-   * _RECV or _SEND
-   */
-  int direction;
 
   /**
-   * For PUT connections: Is this the first or last callback with size 0
-   * For GET connections: Have we sent a message
+   * To whom are we talking to (set to our identity
+   * if we are still waiting for the welcome message)
    */
-  int connected;
+  struct GNUNET_PeerIdentity target;
 
   /**
-   * The session this server connection belongs to
+   * Pointer to the global plugin struct.
    */
-  struct Session *session;
+  struct HTTP_Server_Plugin *plugin;
 
   /**
-   * The MHD connection
+   * next pointer for double linked list
    */
-  struct MHD_Connection *mhd_conn;
+  struct HTTP_Message *msg_head;
 
   /**
-   * The MHD daemon
+   * previous pointer for double linked list
    */
-  struct MHD_Daemon *mhd_daemon;
+  struct HTTP_Message *msg_tail;
 
   /**
-   * Options requested by peer
+   * Message stream tokenizer for incoming data
    */
-  uint32_t options;
-#define OPTION_LONG_POLL 1 /* GET request wants long-poll semantics */
-};
+  struct GNUNET_SERVER_MessageStreamTokenizer *msg_tk;
 
-
-/**
- * Encapsulation of all of the state of the plugin.
- */
-struct HTTP_Server_Plugin
-{
   /**
-   * Our environment.
+   * Client recv handle
    */
-  struct GNUNET_TRANSPORT_PluginEnvironment *env;
+  struct ServerConnection *server_recv;
 
   /**
-   * Linked list head of open sessions.
+   * Client send handle
    */
-  struct Session *head;
+  struct ServerConnection *server_send;
 
   /**
-   * Linked list tail of open sessions.
+   * Address
    */
-  struct Session *tail;
+  struct GNUNET_HELLO_Address *address;
 
   /**
-   * Plugin name
+   * Absolute time when to receive data again
+   * Used for receive throttling
    */
-  char *name;
+  struct GNUNET_TIME_Absolute next_receive;
 
   /**
-   * Protocol
+   * Session timeout task
    */
-  char *protocol;
+  GNUNET_SCHEDULER_TaskIdentifier timeout_task;
 
   /**
-   * My options to be included in the address
+   * Unique HTTP/S connection tag for this connection
    */
-  uint32_t options;
+  uint32_t tag;
 
   /**
-   * External address
+   * ATS network type in NBO
    */
-  char *external_hostname;
+  uint32_t ats_address_network_type;
 
   /**
-   * Verify external address
+   * #GNUNET_YES if this session is known to the service.
    */
-  int verify_external_hostname;
+  int known_to_service;
 
-  /**
-   * Maximum number of sockets the plugin can use
-   * Each http inbound /outbound connections are two connections
-   */
-  unsigned int max_connections;
+};
 
-  /**
-   * Current number of sockets the plugin can use
-   * Each http inbound /outbound connections are two connections
-   */
-  unsigned int cur_connections;
 
+/**
+ * Encapsulation of all of the state of the plugin.
+ */
+struct HTTP_Server_Plugin
+{
   /**
-   * Did we immediately end the session in disconnect_cb
+   * Our environment.
    */
-  int in_shutdown;
+  struct GNUNET_TRANSPORT_PluginEnvironment *env;
 
   /**
-   * Length of peer id
+   * Hash map of open sessions.
    */
-  int peer_id_length;
+  struct GNUNET_CONTAINER_MultiPeerMap *sessions;
 
   /**
-   * External hostname the plugin can be connected to, can be different to
-   * the host's FQDN, used e.g. for reverse proxying
+   * Function to call about session status changes.
    */
-  struct GNUNET_HELLO_Address *ext_addr;
+  GNUNET_TRANSPORT_SessionInfoCallback sic;
 
   /**
-   * Notify transport only about external address
+   * Closure for @e sic.
    */
-  unsigned int external_only;
+  void *sic_cls;
 
   /**
-   * use IPv6
+   * Plugin name
    */
-  uint16_t use_ipv6;
+  char *name;
 
   /**
-   * use IPv4
+   * Protocol
    */
-  uint16_t use_ipv4;
+  char *protocol;
 
   /**
-   * Port used
+   * External address
    */
-  uint16_t port;
+  char *external_hostname;
 
   /**
-   * Task calling transport service about external address
+   * External hostname the plugin can be connected to, can be different to
+   * the host's FQDN, used e.g. for reverse proxying
    */
-  GNUNET_SCHEDULER_TaskIdentifier notify_ext_task;
+  struct GNUNET_HELLO_Address *ext_addr;
 
   /**
    * NAT handle & address management
    */
   struct GNUNET_NAT_Handle *nat;
-
   /**
-   * List of own addresses
-   */
-
-  /**
    * IPv4 addresses DLL head
    */
   struct HttpAddressWrapper *addr_head;
@@ -311,26 +316,6 @@
   struct sockaddr_in6 *server_addr_v6;
 
   /**
-   * MHD IPv4 task
-   */
-  GNUNET_SCHEDULER_TaskIdentifier server_v4_task;
-
-  /**
-   * MHD IPv6 task
-   */
-  GNUNET_SCHEDULER_TaskIdentifier server_v6_task;
-
-  /**
-   * The IPv4 server is scheduled to run asap
-   */
-  int server_v4_immediately;
-
-  /**
-   * The IPv6 server is scheduled to run asap
-   */
-  int server_v6_immediately;
-
-  /**
    * MHD IPv4 daemon
    */
   struct MHD_Daemon *server_v4;
@@ -340,11 +325,6 @@
    */
   struct MHD_Daemon *server_v6;
 
-  /**
-   * Regex for parsing URLs
-   */
-  regex_t url_regex;
-
 #if BUILD_HTTPS
   /**
    * Crypto related
@@ -368,105 +348,224 @@
   char *cert;
 #endif
 
-};
+  /**
+   * MHD IPv4 task
+   */
+  GNUNET_SCHEDULER_TaskIdentifier server_v4_task;
 
+  /**
+   * MHD IPv6 task
+   */
+  GNUNET_SCHEDULER_TaskIdentifier server_v6_task;
 
-/**
- * Wrapper to manage addresses
- */
-struct HttpAddressWrapper
-{
   /**
-   * Linked list next
+   * Task calling transport service about external address
    */
-  struct HttpAddressWrapper *next;
+  GNUNET_SCHEDULER_TaskIdentifier notify_ext_task;
 
   /**
-   * Linked list previous
+   * Notify transport only about external address
    */
-  struct HttpAddressWrapper *prev;
+  unsigned int external_only;
 
-  struct HttpAddress *address;
+  /**
+   * The IPv4 server is scheduled to run asap
+   */
+  int server_v4_immediately;
 
-  size_t addrlen;
-};
+  /**
+   * The IPv6 server is scheduled to run asap
+   */
+  int server_v6_immediately;
 
+  /**
+   * Verify external address
+   */
+  int verify_external_hostname;
 
-/**
- *  Message to send using http
- */
-struct HTTP_Message
-{
   /**
-   * next pointer for double linked list
+   * Maximum number of sockets the plugin can use
+   * Each http inbound /outbound connections are two connections
    */
-  struct HTTP_Message *next;
+  unsigned int max_connections;
 
   /**
-   * previous pointer for double linked list
+   * Current number of sockets the plugin can use
+   * Each http inbound /outbound connections are two connections
    */
-  struct HTTP_Message *prev;
+  unsigned int cur_connections;
 
   /**
-   * buffer containing data to send
+   * Did we immediately end the session in disconnect_cb
    */
-  char *buf;
+  int in_shutdown;
 
   /**
-   * amount of data already sent
+   * Length of peer id
    */
-  size_t pos;
+  int peer_id_length;
 
   /**
-   * buffer length
+   * My options to be included in the address
    */
-  size_t size;
+  uint32_t options;
 
   /**
-   * HTTP/S specific overhead
+   * use IPv6
    */
-  size_t overhead;
+  uint16_t use_ipv6;
 
   /**
-   * Continuation function to call once the transmission buffer
-   * has again space available.  NULL if there is no
-   * continuation to call.
+   * use IPv4
    */
-  GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
+  uint16_t use_ipv4;
 
   /**
-   * Closure for transmit_cont.
+   * Port used
    */
-  void *transmit_cont_cls;
+  uint16_t port;
+
+  /**
+   * Regex for parsing URLs. FIXME: this seems overkill.
+   */
+  regex_t url_regex;
+
 };
 
 
 /**
- * Start session timeout for session s
- * @param s the session
+ * If a session monitor is attached, notify it about the new
+ * session state.
+ *
+ * @param plugin our plugin
+ * @param session session that changed state
+ * @param state new state of the session
  */
 static void
-server_start_session_timeout (struct Session *s);
+notify_session_monitor (struct HTTP_Server_Plugin *plugin,
+                        struct Session *session,
+                        enum GNUNET_TRANSPORT_SessionState state)
+{
+  struct GNUNET_TRANSPORT_SessionInfo info;
 
+  if (NULL == plugin->sic)
+    return;
+  memset (&info, 0, sizeof (info));
+  info.state = state;
+  info.is_inbound = GNUNET_YES;
+  // info.num_msg_pending = session->msgs_in_queue; // FIXME
+  // info.num_bytes_pending = session->bytes_in_queue; // FIXME
+  // info.receive_delay = session->next_receive; // FIXME
+  // info.session_timeout = session->timeout; // FIXME
+  info.address = session->address;
+  plugin->sic (plugin->sic_cls,
+               session,
+               &info);
+}
 
+
 /**
- * Increment session timeout due to activity for session s
- * @param s the session
+ * Reschedule the execution of both IPv4 and IPv6 server.
+ *
+ * @param plugin the plugin
+ * @param server which server to schedule v4 or v6?
+ * @param now #GNUNET_YES to schedule execution immediately, #GNUNET_NO to wait
+ * until timeout
  */
 static void
-server_reschedule_session_timeout (struct Session *s);
+server_reschedule (struct HTTP_Server_Plugin *plugin,
+                   struct MHD_Daemon *server,
+                   int now);
 
 
 /**
- * Cancel timeout for session s
- * @param s the session
+ * Deletes the session.  Must not be used afterwards.
+ *
+ * @param s the session to delete
  */
 static void
-server_stop_session_timeout (struct Session *s);
+server_delete_session (struct Session *s)
+{
+  struct HTTP_Server_Plugin *plugin = s->plugin;
+  struct HTTP_Message *msg;
+  struct HTTP_Message *tmp;
+  struct ServerConnection *send;
+  struct ServerConnection *recv;
 
+  if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task)
+  {
+    GNUNET_SCHEDULER_cancel (s->timeout_task);
+    s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+  }
+  GNUNET_assert (GNUNET_OK ==
+                 GNUNET_CONTAINER_multipeermap_remove (plugin->sessions,
+                                                       &s->target,
+                                                       s));
+  msg = s->msg_head;
+  while (NULL != msg)
+  {
+    tmp = msg->next;
+    GNUNET_CONTAINER_DLL_remove (s->msg_head,
+                                 s->msg_tail,
+                                 msg);
+    if (NULL != msg->transmit_cont)
+      msg->transmit_cont (msg->transmit_cont_cls,
+                          &s->target,
+                          GNUNET_SYSERR,
+                          msg->size,
+                          msg->pos + msg->overhead);
+    GNUNET_free (msg);
+    msg = tmp;
+  }
+  send = s->server_send;
+  if (NULL != send)
+  {
+    LOG (GNUNET_ERROR_TYPE_DEBUG,
+         "Server: %p / %p Terminating inbound PUT session to peer `%s'\n",
+         s, send,
+         GNUNET_i2s (&s->target));
+    send->session = NULL;
+    MHD_set_connection_option (send->mhd_conn,
+                               MHD_CONNECTION_OPTION_TIMEOUT,
+                               1 /* 0 = no timeout, so this is MIN */);
+    server_reschedule (plugin,
+                       send->mhd_daemon,
+                       GNUNET_YES);
+  }
+  recv = s->server_recv;
+  if (NULL != recv)
+  {
+    LOG (GNUNET_ERROR_TYPE_DEBUG,
+         "Server: %p / %p Terminating inbound GET session to peer `%s'\n",
+         s, recv, GNUNET_i2s (&s->target));
+    recv->session = NULL;
+    MHD_set_connection_option (recv->mhd_conn,
+                               MHD_CONNECTION_OPTION_TIMEOUT,
+                               1 /* 0 = no timeout, so this is MIN */);
+    server_reschedule (plugin,
+                       recv->mhd_daemon,
+                       GNUNET_YES);
+  }
+  if (GNUNET_YES == s->known_to_service)
+    plugin->env->session_end (plugin->env->cls,
+                              s->address,
+                              s);
+  if (NULL != s->msg_tk)
+  {
+    GNUNET_SERVER_mst_destroy (s->msg_tk);
+    s->msg_tk = NULL;
+  }
+  GNUNET_HELLO_address_free (s->address);
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Session %p destroyed\n",
+       s);
+  GNUNET_free (s);
+}
 
+
 /**
- * Disconnect session @a s
+ * Disconnect session @a s by telling MHD to close the
+ * connections (reducing timeout, etc.).
  *
  * @param cls closure with the `struct HTTP_Server_Plugin`
  * @param s the session
@@ -474,31 +573,54 @@
  */
 static int
 http_server_plugin_disconnect_session (void *cls,
-                                       struct Session *s);
+                                       struct Session *s)
+{
+  server_delete_session (s);
+  return GNUNET_OK;
+}
 
 
 /**
- * Does session s exist?
+ * Session was idle, so disconnect it
  *
- * @param plugin the plugin handle
- * @param s the session
- * @return #GNUNET_YES on success, #GNUNET_NO on error
+ * @param cls the session
+ * @param tc task context
  */
-static int
-server_exist_session (struct HTTP_Server_Plugin *plugin, struct Session *s);
+static void
+server_session_timeout (void *cls,
+                        const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  struct Session *s = cls;
 
+  s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+  GNUNET_log (TIMEOUT_LOG,
+              "Session %p was idle for %s, disconnecting\n",
+              s,
+             GNUNET_STRINGS_relative_time_to_string 
(HTTP_SERVER_SESSION_TIMEOUT,
+                                                     GNUNET_YES));
+  server_delete_session (s);
+}
 
+
 /**
- * Reschedule the execution of both IPv4 and IPv6 server
- * @param plugin the plugin
- * @param server which server to schedule v4 or v6?
- * @param now #GNUNET_YES to schedule execution immediately, #GNUNET_NO to wait
- * until timeout
+ * Increment session timeout due to activity session @a s
+ *
+ * @param s the session
  */
 static void
-server_reschedule (struct HTTP_Server_Plugin *plugin,
-                   struct MHD_Daemon *server,
-                   int now);
+server_reschedule_session_timeout (struct Session *s)
+{
+ GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s->timeout_task);
+ GNUNET_SCHEDULER_cancel (s->timeout_task);
+ s->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_SERVER_SESSION_TIMEOUT,
+                                                 &server_session_timeout,
+                                                 s);
+ GNUNET_log (TIMEOUT_LOG,
+             "Timeout rescheduled for session %p set to %s\n",
+             s,
+            GNUNET_STRINGS_relative_time_to_string 
(HTTP_SERVER_SESSION_TIMEOUT,
+                                                    GNUNET_YES));
+}
 
 
 /**
@@ -530,29 +652,19 @@
  */
 static ssize_t
 http_server_plugin_send (void *cls,
-                  struct Session *session,
-                  const char *msgbuf, size_t msgbuf_size,
-                  unsigned int priority,
-                  struct GNUNET_TIME_Relative to,
-                  GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
+                         struct Session *session,
+                         const char *msgbuf,
+                         size_t msgbuf_size,
+                         unsigned int priority,
+                         struct GNUNET_TIME_Relative to,
+                         GNUNET_TRANSPORT_TransmitContinuation cont,
+                         void *cont_cls)
 {
   struct HTTP_Server_Plugin *plugin = cls;
   struct HTTP_Message *msg;
-  int bytes_sent = 0;
+  ssize_t bytes_sent = 0;
   char *stat_txt;
 
-  GNUNET_assert (plugin != NULL);
-  GNUNET_assert (session != NULL);
-
-  if (GNUNET_NO == server_exist_session (plugin, session))
-  {
-      GNUNET_break (0);
-      return GNUNET_SYSERR;
-  }
-  if (session->disconnect)
-    return GNUNET_SYSERR;
-
-
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "Session %p/connection %p: Sending message with %u to peer `%s'\n",
        session,
@@ -570,25 +682,45 @@
   msg->transmit_cont = cont;
   msg->transmit_cont_cls = cont_cls;
   memcpy (msg->buf, msgbuf, msgbuf_size);
-
-  GNUNET_CONTAINER_DLL_insert_tail (session->msg_head, session->msg_tail, msg);
-
-  GNUNET_asprintf (&stat_txt, "# bytes currently in %s_server buffers", 
plugin->protocol);
+  GNUNET_CONTAINER_DLL_insert_tail (session->msg_head,
+                                    session->msg_tail,
+                                    msg);
+  GNUNET_asprintf (&stat_txt,
+                   "# bytes currently in %s_server buffers",
+                   plugin->protocol);
   GNUNET_STATISTICS_update (plugin->env->stats,
                             stat_txt, msgbuf_size, GNUNET_NO);
   GNUNET_free (stat_txt);
 
   if (NULL != session->server_send)
-  {
     server_reschedule (session->plugin,
                        session->server_send->mhd_daemon,
                        GNUNET_YES);
-  }
   return bytes_sent;
 }
 
 
 /**
+ * Terminate session.
+ *
+ * @param cls the `struct HTTP_Server_Plugin *`
+ * @param peer for which this is a session
+ * @param value the `struct Session` to clean up
+ * @return #GNUNET_OK (continue to iterate)
+ */
+static int
+destroy_session_cb (void *cls,
+                    const struct GNUNET_PeerIdentity *peer,
+                    void *value)
+{
+  struct Session *s = value;
+
+  server_delete_session (s);
+  return GNUNET_OK;
+}
+
+
+/**
  * Function that can be used to force the plugin to disconnect
  * from the given peer and cancel all previous transmissions
  * (and their continuationc).
@@ -601,24 +733,14 @@
                                     const struct GNUNET_PeerIdentity *target)
 {
   struct HTTP_Server_Plugin *plugin = cls;
-  struct Session *next;
-  struct Session *pos;
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "Transport tells me to disconnect `%s'\n",
        GNUNET_i2s (target));
-  next = plugin->head;
-  while (NULL != (pos = next))
-  {
-    next = pos->next;
-    if (0 == memcmp (target, &pos->target, sizeof (struct 
GNUNET_PeerIdentity)))
-    {
-      LOG (GNUNET_ERROR_TYPE_DEBUG,
-           "Disconnecting session %p to `%s'\n",
-           pos, GNUNET_i2s (target));
-      http_server_plugin_disconnect_session (plugin, pos);
-    }
-  }
+  GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
+                                              target,
+                                              &destroy_session_cb,
+                                              plugin);
 }
 
 
@@ -671,9 +793,9 @@
 
 /**
  * Creates a new outbound session the transport
- * service will use to send data to the peer
+ * service will use to send data to the peer.
  *
- * Since HTTP/S server cannot create sessions, always return NULL
+ * Since HTTP/S server cannot create sessions, always returns NULL.
  *
  * @param cls the plugin
  * @param address the address
@@ -688,85 +810,155 @@
 
 
 /**
- * Deleting the session
- * Must not be used afterwards
+ * Call MHD IPv4 to process pending requests and then go back
+ * and schedule the next run.
  *
- * @param cls closure with the `struct HTTP_ServerPlugin`
- * @param s the session to delete
- * @return #GNUNET_OK on success
+ * @param cls plugin as closure
+ * @param tc task context
  */
-static int
-server_delete_session (void *cls,
-                       struct Session *s)
+static void
+server_v4_run (void *cls,
+               const struct GNUNET_SCHEDULER_TaskContext *tc)
 {
   struct HTTP_Server_Plugin *plugin = cls;
-  struct HTTP_Message *msg;
-  struct HTTP_Message *tmp;
 
-  server_stop_session_timeout(s);
-  GNUNET_CONTAINER_DLL_remove (plugin->head, plugin->tail, s);
-  msg = s->msg_head;
-  while (NULL != msg)
-  {
-    tmp = msg->next;
-    GNUNET_CONTAINER_DLL_remove (s->msg_head, s->msg_tail, msg);
-    if (NULL != msg->transmit_cont)
-      msg->transmit_cont (msg->transmit_cont_cls, &s->target, GNUNET_SYSERR,
-                          msg->size, msg->pos + msg->overhead);
-    GNUNET_free (msg);
-    msg = tmp;
-  }
-  if (NULL != s->msg_tk)
-  {
-    GNUNET_SERVER_mst_destroy (s->msg_tk);
-    s->msg_tk = NULL;
-  }
-  GNUNET_HELLO_address_free (s->address);
-  GNUNET_free_non_null (s->server_recv);
-  GNUNET_free_non_null (s->server_send);
-  LOG (GNUNET_ERROR_TYPE_DEBUG,
-       "Session %p destroyed\n",
-       s);
-  GNUNET_free (s);
-  return GNUNET_OK;
+  plugin->server_v4_task = GNUNET_SCHEDULER_NO_TASK;
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+    return;
+  plugin->server_v4_immediately = GNUNET_NO;
+  GNUNET_assert (MHD_YES == MHD_run (plugin->server_v4));
+  server_reschedule (plugin, plugin->server_v4, GNUNET_NO);
 }
 
 
 /**
-* Cancel timeout for session s
-*
-* @param s the session
-*/
+ * Call MHD IPv6 to process pending requests and then go back
+ * and schedule the next run.
+ *
+ * @param cls plugin as closure
+ * @param tc task context
+ */
 static void
-server_stop_session_timeout (struct Session *s)
+server_v6_run (void *cls,
+               const struct GNUNET_SCHEDULER_TaskContext *tc)
 {
- GNUNET_assert (NULL != s);
+  struct HTTP_Server_Plugin *plugin = cls;
 
- if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task)
- {
-   GNUNET_SCHEDULER_cancel (s->timeout_task);
-   s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
-   GNUNET_log (TIMEOUT_LOG, "Timeout stopped for session %p\n", s);
- }
+  plugin->server_v6_task = GNUNET_SCHEDULER_NO_TASK;
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+    return;
+  plugin->server_v6_immediately = GNUNET_NO;
+  GNUNET_assert (MHD_YES == MHD_run (plugin->server_v6));
+  server_reschedule (plugin, plugin->server_v6, GNUNET_NO);
 }
 
 
 /**
  * Function that queries MHD's select sets and
  * starts the task waiting for them.
+ *
  * @param plugin plugin
  * @param daemon_handle the MHD daemon handle
- * @param now schedule immediately
- * @return task identifier
+ * @return gnunet task identifier
  */
 static GNUNET_SCHEDULER_TaskIdentifier
 server_schedule (struct HTTP_Server_Plugin *plugin,
                  struct MHD_Daemon *daemon_handle,
-                 int now);
+                 int now)
+{
+  GNUNET_SCHEDULER_TaskIdentifier ret;
+  fd_set rs;
+  fd_set ws;
+  fd_set es;
+  struct GNUNET_NETWORK_FDSet *wrs;
+  struct GNUNET_NETWORK_FDSet *wws;
+  int max;
+  MHD_UNSIGNED_LONG_LONG timeout;
+  static unsigned long long last_timeout = 0;
+  int haveto;
+  struct GNUNET_TIME_Relative tv;
 
+  if (GNUNET_YES == plugin->in_shutdown)
+    return GNUNET_SCHEDULER_NO_TASK;
 
+  ret = GNUNET_SCHEDULER_NO_TASK;
+  FD_ZERO (&rs);
+  FD_ZERO (&ws);
+  FD_ZERO (&es);
+  wrs = 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)
+  {
+    if (timeout != last_timeout)
+    {
+      LOG (GNUNET_ERROR_TYPE_DEBUG,
+           "SELECT Timeout changed from %llu to %llu (ms)\n",
+           last_timeout, timeout);
+      last_timeout = timeout;
+    }
+    if (timeout <= GNUNET_TIME_UNIT_SECONDS.rel_value_us / 1000LL)
+      tv.rel_value_us = (uint64_t) timeout * 1000LL;
+    else
+      tv = GNUNET_TIME_UNIT_SECONDS;
+  }
+  else
+    tv = GNUNET_TIME_UNIT_SECONDS;
+  /* Force immediate run, since we have outbound data to send */
+  if (now == GNUNET_YES)
+    tv = GNUNET_TIME_UNIT_MILLISECONDS;
+  GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
+  GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
+
+  if (daemon_handle == plugin->server_v4)
+  {
+    if (plugin->server_v4_task != GNUNET_SCHEDULER_NO_TASK)
+    {
+      GNUNET_SCHEDULER_cancel (plugin->server_v4_task);
+      plugin->server_v4_task = GNUNET_SCHEDULER_NO_TASK;
+    }
+#if 0
+    LOG (GNUNET_ERROR_TYPE_DEBUG,
+         "Scheduling IPv4 server task in %llu ms\n",
+         tv);
+#endif
+    ret =
+        GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+                                     tv, wrs, wws,
+                                     &server_v4_run, plugin);
+  }
+  if (daemon_handle == plugin->server_v6)
+  {
+    if (plugin->server_v6_task != GNUNET_SCHEDULER_NO_TASK)
+    {
+      GNUNET_SCHEDULER_cancel (plugin->server_v6_task);
+      plugin->server_v6_task = GNUNET_SCHEDULER_NO_TASK;
+    }
+#if 0
+    LOG (GNUNET_ERROR_TYPE_DEBUG,
+         "Scheduling IPv6 server task in %llu ms\n", tv);
+#endif
+    ret =
+        GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+                                     tv, wrs, wws,
+                                     &server_v6_run, plugin);
+  }
+  GNUNET_NETWORK_fdset_destroy (wrs);
+  GNUNET_NETWORK_fdset_destroy (wws);
+  return ret;
+}
+
+
 /**
  * Reschedule the execution of both IPv4 and IPv6 server
+ *
  * @param plugin the plugin
  * @param server which server to schedule v4 or v6?
  * @param now #GNUNET_YES to schedule execution immediately, #GNUNET_NO to wait
@@ -812,55 +1004,6 @@
 
 
 /**
- * Disconnect session @a s
- *
- * @param cls closure with the `struct HTTP_Server_Plugin`
- * @param s the session
- * @return #GNUNET_OK on success
- */
-static int
-http_server_plugin_disconnect_session (void *cls,
-                                       struct Session *s)
-{
-  struct HTTP_Server_Plugin *plugin = cls;
-  struct ServerConnection * send;
-  struct ServerConnection * recv;
-
-  if (GNUNET_NO == server_exist_session (plugin, s))
-  {
-    GNUNET_break (0);
-    return GNUNET_SYSERR;
-  }
-  s->disconnect = GNUNET_YES;
-  send = (struct ServerConnection *) s->server_send;
-  if (send != NULL)
-  {
-    LOG (GNUNET_ERROR_TYPE_DEBUG,
-         "Server: %p / %p Terminating inbound PUT session to peer `%s'\n",
-         s, send, GNUNET_i2s (&s->target));
-
-    MHD_set_connection_option (send->mhd_conn,
-                               MHD_CONNECTION_OPTION_TIMEOUT,
-                               1);
-    server_reschedule (s->plugin, send->mhd_daemon, GNUNET_YES);
-  }
-
-  recv = (struct ServerConnection *) s->server_recv;
-  if (recv != NULL)
-  {
-    LOG (GNUNET_ERROR_TYPE_DEBUG,
-         "Server: %p / %p Terminating inbound GET session to peer `%s'\n",
-         s, recv, GNUNET_i2s (&s->target));
-    MHD_set_connection_option (recv->mhd_conn,
-                               MHD_CONNECTION_OPTION_TIMEOUT,
-                               1);
-    server_reschedule (s->plugin, recv->mhd_daemon, GNUNET_YES);
-  }
-  return GNUNET_OK;
-}
-
-
-/**
  * Function that is called to get the keepalive factor.
  * GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
  * calculate the interval between keepalive packets.
@@ -874,16 +1017,12 @@
   return 3;
 }
 
+
 static void
 http_server_plugin_update_session_timeout (void *cls,
-                                  const struct GNUNET_PeerIdentity *peer,
-                                  struct Session *session)
+                                           const struct GNUNET_PeerIdentity 
*peer,
+                                           struct Session *session)
 {
-  struct HTTP_Server_Plugin *plugin = cls;
-
-  if (GNUNET_NO == server_exist_session (plugin, session))
-      return;
-
   server_reschedule_session_timeout (session);
 }
 
@@ -900,7 +1039,7 @@
                               struct Session *s,
                               unsigned int to)
 {
-    /* Setting timeouts for other connections */
+  /* Setting timeouts for other connections */
   if (NULL != s->server_recv)
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG,
@@ -1054,6 +1193,48 @@
 
 
 /**
+ * Closure for #session_tag_it().
+ */
+struct SessionTagContext
+{
+  /**
+   * Set to session matching the tag.
+   */
+  struct Session *res;
+
+  /**
+   * Tag we are looking for.
+   */
+  uint32_t tag;
+};
+
+
+/**
+ * Find a session with a matching tag.
+ *
+ * @param cls the `struct SessionTagContext *`
+ * @param key peer identity (unused)
+ * @param value the `struct Session *`
+ * @return #GNUNET_NO if we found the session, #GNUNET_OK if not
+ */
+static int
+session_tag_it (void *cls,
+                const struct GNUNET_PeerIdentity *key,
+                void *value)
+{
+  struct SessionTagContext *stc = cls;
+  struct Session *s = value;
+
+  if (s->tag == stc->tag)
+  {
+    stc->res = s;
+    return GNUNET_NO;
+  }
+  return GNUNET_YES;
+}
+
+
+/**
  * Lookup a mhd connection and create one if none is found
  *
  * @param plugin the plugin handle
@@ -1064,18 +1245,18 @@
  */
 static struct ServerConnection *
 server_lookup_connection (struct HTTP_Server_Plugin *plugin,
-                       struct MHD_Connection *mhd_connection, const char *url,
-                       const char *method)
+                          struct MHD_Connection *mhd_connection,
+                          const char *url,
+                          const char *method)
 {
   struct Session *s = NULL;
   struct ServerConnection *sc = NULL;
   const union MHD_ConnectionInfo *conn_info;
   struct HttpAddress *addr;
-
   struct GNUNET_ATS_Information ats;
   struct GNUNET_PeerIdentity target;
   size_t addr_len;
-  uint32_t tag = 0;
+  struct SessionTagContext stc;
   uint32_t options;
   int direction = GNUNET_SYSERR;
   unsigned int to;
@@ -1089,8 +1270,9 @@
        "New %s connection from %s\n",
        method,
        url);
-
-  if (GNUNET_SYSERR == server_parse_url (plugin, url, &target, &tag, &options))
+  stc.tag = 0;
+  if (GNUNET_SYSERR ==
+      server_parse_url (plugin, url, &target, &stc.tag, &options))
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "Invalid url %s\n", url);
@@ -1112,51 +1294,38 @@
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "New %s connection from %s with tag %u (%u of %u)\n",
        method,
-       GNUNET_i2s (&target), tag,
+       GNUNET_i2s (&target),
+       stc.tag,
        plugin->cur_connections, plugin->max_connections);
-  /* find duplicate session */
-  s = plugin->head;
-  while (s != NULL)
+  /* find existing session */
+  stc.res = NULL;
+  GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
+                                              &target,
+                                              &session_tag_it,
+                                              &stc);
+  if (NULL == (s = stc.res))
   {
-    if ((0 == memcmp (&s->target, &target, sizeof (struct 
GNUNET_PeerIdentity))) &&
-        (s->tag == tag))
-      break;
-    s = s->next;
-  }
-  if (s != NULL)
-  {
-    if ((_RECEIVE == direction) && (NULL != s->server_recv))
-    {
-      LOG (GNUNET_ERROR_TYPE_DEBUG,
-           "Duplicate PUT connection from `%s' tag %u, dismissing new 
connection\n",
-           GNUNET_i2s (&target),
-           tag);
-      return NULL;
-    }
-    if ((_SEND == direction) && (NULL != s->server_send))
-    {
-      LOG (GNUNET_ERROR_TYPE_DEBUG,
-           "Duplicate GET connection from `%s' tag %u, dismissing new 
connection\n",
-           GNUNET_i2s (&target),
-           tag);
-      return NULL;
-    }
-  }
-  else
-  {
     /* create new session */
     addr = NULL;
     switch (conn_info->client_addr->sa_family)
     {
     case (AF_INET):
-      addr = http_common_address_from_socket (plugin->protocol, 
conn_info->client_addr, sizeof (struct sockaddr_in));
+      addr = http_common_address_from_socket (plugin->protocol,
+                                              conn_info->client_addr,
+                                              sizeof (struct sockaddr_in));
       addr_len = http_common_address_get_size (addr);
-      ats = plugin->env->get_address_type (plugin->env->cls, 
conn_info->client_addr, sizeof (struct sockaddr_in));
+      ats = plugin->env->get_address_type (plugin->env->cls,
+                                           conn_info->client_addr,
+                                           sizeof (struct sockaddr_in));
       break;
     case (AF_INET6):
-      addr = http_common_address_from_socket (plugin->protocol, 
conn_info->client_addr, sizeof (struct sockaddr_in6));
+      addr = http_common_address_from_socket (plugin->protocol,
+                                              conn_info->client_addr,
+                                              sizeof (struct sockaddr_in6));
       addr_len = http_common_address_get_size (addr);
-      ats = plugin->env->get_address_type (plugin->env->cls, 
conn_info->client_addr, sizeof (struct sockaddr_in6));
+      ats = plugin->env->get_address_type (plugin->env->cls,
+                                           conn_info->client_addr,
+                                           sizeof (struct sockaddr_in6));
       break;
     default:
        /* external host name */
@@ -1164,21 +1333,24 @@
       ats.type = htonl (GNUNET_ATS_NET_WAN);
       return NULL;
     }
-
     s = GNUNET_new (struct Session);
-    memcpy (&s->target, &target, sizeof (struct GNUNET_PeerIdentity));
+    s->target = target;
     s->plugin = plugin;
-    s->address = GNUNET_HELLO_address_allocate (&s->target, PLUGIN_NAME,
-        addr, addr_len, GNUNET_HELLO_ADDRESS_INFO_INBOUND);
+    s->address = GNUNET_HELLO_address_allocate (&s->target,
+                                                PLUGIN_NAME,
+                                                addr,
+                                                addr_len,
+                                                
GNUNET_HELLO_ADDRESS_INFO_INBOUND);
     s->ats_address_network_type = ats.value;
     s->next_receive = GNUNET_TIME_UNIT_ZERO_ABS;
-    s->tag = tag;
-    s->server_recv = NULL;
-    s->server_send = NULL;
-    s->session_passed = GNUNET_NO;
-    s->session_ended = GNUNET_NO;
-    server_start_session_timeout(s);
-    GNUNET_CONTAINER_DLL_insert (plugin->head, plugin->tail, s);
+    s->tag = stc.tag;
+    s->timeout_task = GNUNET_SCHEDULER_add_delayed 
(HTTP_SERVER_SESSION_TIMEOUT,
+                                                    &server_session_timeout,
+                                                    s);
+    (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessions,
+                                              &s->target,
+                                              s,
+                                              
GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
 
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "Creating new session %p for peer `%s' connecting from `%s'\n",
@@ -1188,6 +1360,23 @@
                                                addr_len));
     GNUNET_free_non_null (addr);
   }
+
+  if ( (_RECEIVE == direction) && (NULL != s->server_recv) )
+  {
+    LOG (GNUNET_ERROR_TYPE_DEBUG,
+         "Duplicate PUT connection from `%s' tag %u, dismissing new 
connection\n",
+         GNUNET_i2s (&target),
+         stc.tag);
+    return NULL;
+  }
+  if ((_SEND == direction) && (NULL != s->server_send))
+  {
+    LOG (GNUNET_ERROR_TYPE_DEBUG,
+         "Duplicate GET connection from `%s' tag %u, dismissing new 
connection\n",
+         GNUNET_i2s (&target),
+         stc.tag);
+    return NULL;
+  }
   sc = GNUNET_new (struct ServerConnection);
   if (conn_info->client_addr->sa_family == AF_INET)
     sc->mhd_daemon = plugin->server_v4;
@@ -1205,6 +1394,7 @@
 
   if ((NULL != s->server_send) && (NULL != s->server_recv))
   {
+    s->known_to_service = GNUNET_YES;
     plugin->env->session_start (NULL, s->address ,s, NULL, 0);
   }
 
@@ -1223,7 +1413,6 @@
     to = (HTTP_SERVER_SESSION_TIMEOUT.rel_value_us / 1000LL / 1000LL);
     server_mhd_connection_timeout (plugin, s, to);
   }
-
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "Setting timeout for %p to %u sec.\n", sc, to);
   return sc;
@@ -1231,39 +1420,6 @@
 
 
 /**
- * Lookup a session for a server connection
- *
- * @param plugin the plugin
- * @param sc the server connection
- * @return the session found or NULL
- */
-static struct Session *
-server_lookup_session (struct HTTP_Server_Plugin *plugin,
-                       struct ServerConnection * sc)
-{
-  struct Session *s;
-
-  for (s = plugin->head; NULL != s; s = s->next)
-    if ((s->server_recv == sc) || (s->server_send == sc))
-      return s;
-  return NULL;
-}
-
-
-static int
-server_exist_session (struct HTTP_Server_Plugin *plugin,
-                      struct Session *s)
-{
-  struct Session * head;
-
-  for (head = plugin->head; head != NULL; head = head->next)
-    if (head == s)
-      return GNUNET_YES;
-  return GNUNET_NO;
-}
-
-
-/**
  * Callback called by MHD when it needs data to send
  *
  * @param cls current session
@@ -1273,7 +1429,10 @@
  * @return bytes written to buffer
  */
 static ssize_t
-server_send_callback (void *cls, uint64_t pos, char *buf, size_t max)
+server_send_callback (void *cls,
+                      uint64_t pos,
+                      char *buf,
+                      size_t max)
 {
   struct Session *s = cls;
   struct ServerConnection *sc;
@@ -1281,8 +1440,6 @@
   struct HTTP_Message *msg;
   char *stat_txt;
 
-  if (GNUNET_NO == server_exist_session (s->plugin, s))
-    return 0;
   sc = s->server_send;
   if (NULL == sc)
     return 0;
@@ -1298,7 +1455,9 @@
     /* removing message */
     if (msg->pos == msg->size)
     {
-      GNUNET_CONTAINER_DLL_remove (s->msg_head, s->msg_tail, msg);
+      GNUNET_CONTAINER_DLL_remove (s->msg_head,
+                                   s->msg_tail,
+                                   msg);
       if (NULL != msg->transmit_cont)
         msg->transmit_cont (msg->transmit_cont_cls, &s->target, GNUNET_OK,
                             msg->size, msg->size + msg->overhead);
@@ -1342,7 +1501,8 @@
  * @return #GNUNET_OK
  */
 static int
-server_receive_mst_cb (void *cls, void *client,
+server_receive_mst_cb (void *cls,
+                       void *client,
                        const struct GNUNET_MessageHeader *message)
 {
   struct Session *s = cls;
@@ -1351,24 +1511,30 @@
   struct GNUNET_TIME_Relative delay;
   char *stat_txt;
 
-  if (GNUNET_NO == server_exist_session (s->plugin, s))
-    return GNUNET_OK;
-
-
   atsi.type = htonl (GNUNET_ATS_NETWORK_TYPE);
   atsi.value = s->ats_address_network_type;
-  GNUNET_break (s->ats_address_network_type != ntohl 
(GNUNET_ATS_NET_UNSPECIFIED));
+  GNUNET_break (s->ats_address_network_type !=
+                ntohl (GNUNET_ATS_NET_UNSPECIFIED));
 
-  delay = plugin->env->receive (plugin->env->cls, s->address, s, message);
-  plugin->env->update_address_metrics (plugin->env->cls, s->address, s, &atsi, 
1);
-
-  GNUNET_asprintf (&stat_txt, "# bytes received via %s_server", 
plugin->protocol);
+  if (GNUNET_NO == s->known_to_service)
+  {
+    s->known_to_service = GNUNET_YES;
+    plugin->env->session_start (NULL, s->address, s, NULL, 0);
+  }
+  delay = plugin->env->receive (plugin->env->cls,
+                                s->address,
+                                s,
+                                message);
+  plugin->env->update_address_metrics (plugin->env->cls,
+                                       s->address, s,
+                                       &atsi, 1);
+  GNUNET_asprintf (&stat_txt,
+                   "# bytes received via %s_server",
+                   plugin->protocol);
   GNUNET_STATISTICS_update (plugin->env->stats,
                             stat_txt, ntohs (message->size), GNUNET_NO);
   GNUNET_free (stat_txt);
-
-  s->session_passed = GNUNET_YES;
-  s->next_receive = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (), 
delay);
+  s->next_receive = GNUNET_TIME_relative_to_absolute (delay);
   if (delay.rel_value_us > 0)
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG,
@@ -1384,6 +1550,7 @@
   return GNUNET_OK;
 }
 
+
 /**
  * Add headers to a request indicating that we allow Cross-Origin Resource
  * Sharing.
@@ -1402,6 +1569,7 @@
                            "86400");
 }
 
+
 /**
  * MHD callback for a new incoming connection
  *
@@ -1416,26 +1584,31 @@
  * @return MHD_YES if connection is accepted, MHD_NO on reject
  */
 static int
-server_access_cb (void *cls, struct MHD_Connection *mhd_connection,
-                  const char *url, const char *method, const char *version,
-                  const char *upload_data, size_t * upload_data_size,
+server_access_cb (void *cls,
+                  struct MHD_Connection *mhd_connection,
+                  const char *url,
+                  const char *method,
+                  const char *version,
+                  const char *upload_data,
+                  size_t *upload_data_size,
                   void **httpSessionCache)
 {
   struct HTTP_Server_Plugin *plugin = cls;
-  int res = MHD_YES;
-
   struct ServerConnection *sc = *httpSessionCache;
   struct Session *s;
   struct MHD_Response *response;
+  int res = MHD_YES;
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        _("Access from connection %p (%u of %u) for `%s' `%s' url `%s' with 
upload data size %u\n"),
        sc,
-       plugin->cur_connections, plugin->max_connections,
-       method, version, url, (*upload_data_size));
-
-  GNUNET_assert (cls != NULL);
-  if (sc == NULL)
+       plugin->cur_connections,
+       plugin->max_connections,
+       method,
+       version,
+       url,
+       (*upload_data_size));
+  if (NULL == sc)
   {
     /* CORS pre-flight request */
     if (0 == strcmp (MHD_HTTP_METHOD_OPTIONS, method))
@@ -1449,13 +1622,18 @@
     }
     /* new connection */
     sc = server_lookup_connection (plugin, mhd_connection, url, method);
-    if (sc != NULL)
+    if (NULL != sc)
     {
+      /* attach to new / existing session */
       (*httpSessionCache) = sc;
     }
     else
     {
-      response = MHD_create_response_from_data (strlen (HTTP_ERROR_RESPONSE), 
HTTP_ERROR_RESPONSE, MHD_NO, MHD_NO);
+      /* existing session already has matching connection, refuse */
+      response = MHD_create_response_from_data (strlen (HTTP_ERROR_RESPONSE),
+                                                HTTP_ERROR_RESPONSE,
+                                                MHD_NO,
+                                                MHD_NO);
       MHD_add_response_header (response,
                               MHD_HTTP_HEADER_CONTENT_TYPE,
                               "text/html");
@@ -1465,33 +1643,19 @@
       return res;
     }
   }
-  else
+  /* 'old' connection */
+  if (NULL == (s = sc->session))
   {
-    /* 'old' connection */
-    if (NULL == server_lookup_session (plugin, sc))
-    {
-      /* Session was already disconnected */
-      return MHD_NO;
-    }
-  }
-
-  /* existing connection */
-  sc = (*httpSessionCache);
-  s = sc->session;
-  GNUNET_assert (NULL != s);
-  /* connection is to be disconnected */
-  if (s->disconnect == GNUNET_YES)
-  {
-    /* Sent HTTP/1.1: 200 OK as response */
+    /* Session was already disconnected;
+       sent HTTP/1.1: 200 OK as response */
     response = MHD_create_response_from_data (strlen ("Thank you!"),
-                                       "Thank you!",
-                                       MHD_NO, MHD_NO);
+                                              "Thank you!",
+                                              MHD_NO, MHD_NO);
     add_cors_headers(response);
     MHD_queue_response (mhd_connection, MHD_HTTP_OK, response);
     MHD_destroy_response (response);
     return MHD_YES;
   }
-  GNUNET_assert (s != NULL);
 
   if (sc->direction == _SEND)
   {
@@ -1595,68 +1759,61 @@
  * @param httpSessionCache the pointer to distinguish
  */
 static void
-server_disconnect_cb (void *cls, struct MHD_Connection *connection,
+server_disconnect_cb (void *cls,
+                      struct MHD_Connection *connection,
                       void **httpSessionCache)
 {
   struct HTTP_Server_Plugin *plugin = cls;
   struct ServerConnection *sc = *httpSessionCache;
   struct Session *s;
-  struct Session *t;
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "Disconnect for connection %p\n",
        sc);
-  if (sc == NULL)
-    return;
-
-  if (NULL == (s = server_lookup_session (plugin, sc)))
-    return;
-  for (t = plugin->head; t != NULL; t = t->next)
-    if (t == s)
-      break;
-  if (NULL == t)
-    return;
-
+  if (NULL == sc)
+    return; /* never really got setup */
+  if (NULL == (s = sc->session))
+    return; /* session already dead */
   if (sc->direction == _SEND)
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "Peer `%s' connection  %p, GET on address `%s' disconnected\n",
-         GNUNET_i2s (&s->target), s->server_send,
+         GNUNET_i2s (&s->target),
+         s->server_send,
          http_common_plugin_address_to_string (plugin->protocol,
                                                s->address->address,
                                                s->address->address_length));
     s->server_send = NULL;
-    if (!(sc->options & OPTION_LONG_POLL) && NULL != (s->server_recv))
+    if (! ( (0 != (sc->options & OPTION_LONG_POLL)) &&
+            (NULL != s->server_recv) ) )
     {
-      s->disconnect = GNUNET_YES;
-      GNUNET_assert (NULL != s->server_recv->mhd_conn);
-#if MHD_VERSION >= 0x00090E00
-      MHD_set_connection_option (s->server_recv->mhd_conn, 
MHD_CONNECTION_OPTION_TIMEOUT,
-                                 1);
-#endif
-      server_reschedule (plugin, s->server_recv->mhd_daemon, GNUNET_NO);
+      server_delete_session (s);
+      GNUNET_free (sc);
+      plugin->cur_connections--;
+      return;
     }
   }
   if (sc->direction == _RECEIVE)
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "Peer `%s' connection %p PUT on address `%s' disconnected\n",
-         GNUNET_i2s (&s->target), s->server_recv,
+         GNUNET_i2s (&s->target),
+         s->server_recv,
          http_common_plugin_address_to_string (plugin->protocol,
                                                s->address->address,
                                                s->address->address_length));
     s->server_recv = NULL;
-    if (s->msg_tk != NULL)
+    if (NULL != s->msg_tk)
     {
       GNUNET_SERVER_mst_destroy (s->msg_tk);
       s->msg_tk = NULL;
     }
   }
-
   GNUNET_free (sc);
   plugin->cur_connections--;
 
-  if (s->disconnect && (s->server_send == NULL) && (s->server_recv == NULL))
+  if ( (NULL == s->server_send) &&
+       (NULL == s->server_recv) )
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "Peer `%s' on address `%s' disconnected\n",
@@ -1665,13 +1822,7 @@
                                                s->address->address,
                                                s->address->address_length));
 
-    if ((GNUNET_YES == s->session_passed) && (GNUNET_NO == s->session_ended))
-    {
-        /* Notify transport immediately that this session is invalid */
-        s->session_ended = GNUNET_YES;
-        plugin->env->session_end (plugin->env->cls, s->address, s);
-    }
-    server_delete_session (plugin, s);
+    server_delete_session (s);
   }
 }
 
@@ -1685,7 +1836,9 @@
  * @return MHD_YES if connection is accepted, MHD_NO if connection is rejected
  */
 static int
-server_accept_cb (void *cls, const struct sockaddr *addr, socklen_t addr_len)
+server_accept_cb (void *cls,
+                  const struct sockaddr *addr,
+                  socklen_t addr_len)
 {
   struct HTTP_Server_Plugin *plugin = cls;
 
@@ -1708,170 +1861,20 @@
 
 
 static void
-server_log (void *arg, const char *fmt, va_list ap)
+server_log (void *arg,
+            const char *fmt,
+            va_list ap)
 {
   char text[1024];
 
   vsnprintf (text, sizeof (text), fmt, ap);
   va_end (ap);
-  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Server: %s\n", text);
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Server: %s\n",
+              text);
 }
 
 
-/**
- * Call MHD IPv4 to process pending requests and then go back
- * and schedule the next run.
- * @param cls plugin as closure
- * @param tc task context
- */
-static void
-server_v4_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
-  struct HTTP_Server_Plugin *plugin = cls;
-
-  GNUNET_assert (cls != NULL);
-
-  plugin->server_v4_task = GNUNET_SCHEDULER_NO_TASK;
-  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
-    return;
-#if 0
-  LOG (GNUNET_ERROR_TYPE_DEBUG,
-       "Running IPv4 server\n");
-#endif
-  plugin->server_v4_immediately = GNUNET_NO;
-  GNUNET_assert (MHD_YES == MHD_run (plugin->server_v4));
-  server_reschedule (plugin, plugin->server_v4, GNUNET_NO);
-}
-
-
-/**
- * Call MHD IPv6 to process pending requests and then go back
- * and schedule the next run.
- * @param cls plugin as closure
- * @param tc task context
- */
-static void
-server_v6_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
-  struct HTTP_Server_Plugin *plugin = cls;
-
-  GNUNET_assert (cls != NULL);
-  plugin->server_v6_task = GNUNET_SCHEDULER_NO_TASK;
-  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
-    return;
-#if 0
-  LOG (GNUNET_ERROR_TYPE_DEBUG,
-       "Running IPv6 server\n");
-#endif
-  plugin->server_v6_immediately = GNUNET_NO;
-  GNUNET_assert (MHD_YES == MHD_run (plugin->server_v6));
-  server_reschedule (plugin, plugin->server_v6, GNUNET_NO);
-}
-
-
-/**
- * Function that queries MHD's select sets and
- * starts the task waiting for them.
- *
- * @param plugin plugin
- * @param daemon_handle the MHD daemon handle
- * @return gnunet task identifier
- */
-static GNUNET_SCHEDULER_TaskIdentifier
-server_schedule (struct HTTP_Server_Plugin *plugin,
-                 struct MHD_Daemon *daemon_handle,
-                 int now)
-{
-  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;
-  MHD_UNSIGNED_LONG_LONG timeout;
-  static unsigned long long last_timeout = 0;
-  int haveto;
-
-  struct GNUNET_TIME_Relative tv;
-
-  if (GNUNET_YES == plugin->in_shutdown)
-    return GNUNET_SCHEDULER_NO_TASK;
-
-  ret = GNUNET_SCHEDULER_NO_TASK;
-  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)
-  {
-    if (timeout != last_timeout)
-    {
-      LOG (GNUNET_ERROR_TYPE_DEBUG,
-           "SELECT Timeout changed from %llu to %llu (ms)\n",
-           last_timeout, timeout);
-      last_timeout = timeout;
-    }
-    if (timeout <= GNUNET_TIME_UNIT_SECONDS.rel_value_us / 1000LL)
-      tv.rel_value_us = (uint64_t) timeout * 1000LL;
-    else
-      tv = GNUNET_TIME_UNIT_SECONDS;
-  }
-  else
-    tv = GNUNET_TIME_UNIT_SECONDS;
-  /* Force immediate run, since we have outbound data to send */
-  if (now == GNUNET_YES)
-    tv = GNUNET_TIME_UNIT_MILLISECONDS;
-  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);
-
-  if (daemon_handle == plugin->server_v4)
-  {
-    if (plugin->server_v4_task != GNUNET_SCHEDULER_NO_TASK)
-    {
-      GNUNET_SCHEDULER_cancel (plugin->server_v4_task);
-      plugin->server_v4_task = GNUNET_SCHEDULER_NO_TASK;
-    }
-#if 0
-    LOG (GNUNET_ERROR_TYPE_DEBUG,
-         "Scheduling IPv4 server task in %llu ms\n",
-         tv);
-#endif
-    ret =
-        GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
-                                     tv, wrs, wws,
-                                     &server_v4_run, plugin);
-  }
-  if (daemon_handle == plugin->server_v6)
-  {
-    if (plugin->server_v6_task != GNUNET_SCHEDULER_NO_TASK)
-    {
-      GNUNET_SCHEDULER_cancel (plugin->server_v6_task);
-      plugin->server_v6_task = GNUNET_SCHEDULER_NO_TASK;
-    }
-#if 0
-    LOG (GNUNET_ERROR_TYPE_DEBUG,
-         "Scheduling IPv6 server task in %llu ms\n", tv);
-#endif
-    ret =
-        GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
-                                     tv, wrs, wws,
-                                     &server_v6_run, plugin);
-  }
-  GNUNET_NETWORK_fdset_destroy (wrs);
-  GNUNET_NETWORK_fdset_destroy (wws);
-  GNUNET_NETWORK_fdset_destroy (wes);
-  return ret;
-}
-
-
 #if BUILD_HTTPS
 /**
  * Load ssl certificate from file
@@ -1927,7 +1930,8 @@
 
 
   if (GNUNET_OK !=
-      GNUNET_CONFIGURATION_get_value_filename (plugin->env->cfg, plugin->name,
+      GNUNET_CONFIGURATION_get_value_filename (plugin->env->cfg,
+                                               plugin->name,
                                                "KEY_FILE", &key_file))
   {
     GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
@@ -1935,7 +1939,8 @@
     return GNUNET_SYSERR;
   }
   if (GNUNET_OK !=
-      GNUNET_CONFIGURATION_get_value_filename (plugin->env->cfg, plugin->name,
+      GNUNET_CONFIGURATION_get_value_filename (plugin->env->cfg,
+                                               plugin->name,
                                                "CERT_FILE", &cert_file))
   {
     GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
@@ -2035,7 +2040,7 @@
  * Start the HTTP server
  *
  * @param plugin the plugin handle
- * @return GNUNET_OK on success, GNUNET_SYSERR on failure
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
  */
 static int
 server_start (struct HTTP_Server_Plugin *plugin)
@@ -2181,7 +2186,7 @@
 }
 
 
-void
+static void
 server_stop (struct HTTP_Server_Plugin *plugin)
 {
   if (plugin->server_v4 != NULL)
@@ -2223,20 +2228,24 @@
  * Add an address to the server's set of addresses and notify transport
  *
  * @param cls the plugin handle
- * @param add_remove GNUNET_YES on add, GNUNET_NO on remove
+ * @param add_remove #GNUNET_YES on add, #GNUNET_NO on remove
  * @param addr the address
  * @param addrlen address length
  */
 static void
-server_add_address (void *cls, int add_remove, const struct sockaddr *addr,
-                 socklen_t addrlen)
+server_add_address (void *cls,
+                    int add_remove,
+                    const struct sockaddr *addr,
+                    socklen_t addrlen)
 {
   struct HTTP_Server_Plugin *plugin = cls;
   struct GNUNET_HELLO_Address *address;
   struct HttpAddressWrapper *w = NULL;
 
   w = GNUNET_new (struct HttpAddressWrapper);
-  w->address = http_common_address_from_socket (plugin->protocol, addr, 
addrlen);
+  w->address = http_common_address_from_socket (plugin->protocol,
+                                                addr,
+                                                addrlen);
   if (NULL == w->address)
   {
     GNUNET_free (w);
@@ -2244,7 +2253,9 @@
   }
   w->addrlen = http_common_address_get_size (w->address);
 
-  GNUNET_CONTAINER_DLL_insert(plugin->addr_head, plugin->addr_tail, w);
+  GNUNET_CONTAINER_DLL_insert (plugin->addr_head,
+                               plugin->addr_tail,
+                               w);
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "Notifying transport to add address `%s'\n",
        http_common_plugin_address_to_string (plugin->protocol,
@@ -2259,7 +2270,9 @@
       "http_client", w->address, w->addrlen, GNUNET_HELLO_ADDRESS_INFO_NONE);
 #endif
 
-  plugin->env->notify_address (plugin->env->cls, add_remove, address);
+  plugin->env->notify_address (plugin->env->cls,
+                               add_remove,
+                               address);
   GNUNET_HELLO_address_free (address);
 }
 
@@ -2268,28 +2281,38 @@
  * Remove an address from the server's set of addresses and notify transport
  *
  * @param cls the plugin handle
- * @param add_remove GNUNET_YES on add, GNUNET_NO on remove
+ * @param add_remove #GNUNET_YES on add, #GNUNET_NO on remove
  * @param addr the address
  * @param addrlen address length
  */
 static void
-server_remove_address (void *cls, int add_remove, const struct sockaddr *addr,
-                    socklen_t addrlen)
+server_remove_address (void *cls,
+                       int add_remove,
+                       const struct sockaddr *addr,
+                       socklen_t addrlen)
 {
   struct HTTP_Server_Plugin *plugin = cls;
   struct GNUNET_HELLO_Address *address;
   struct HttpAddressWrapper *w = plugin->addr_head;
   size_t saddr_len;
-  void * saddr = http_common_address_from_socket (plugin->protocol, addr, 
addrlen);
+  void * saddr;
+
+  saddr = http_common_address_from_socket (plugin->protocol,
+                                           addr,
+                                           addrlen);
   if (NULL == saddr)
     return;
-  saddr_len =  http_common_address_get_size (saddr);
+  saddr_len = http_common_address_get_size (saddr);
 
   while (NULL != w)
   {
-      if (GNUNET_YES == http_common_cmp_addresses(w->address, w->addrlen, 
saddr, saddr_len))
-        break;
-      w = w->next;
+    if (GNUNET_YES ==
+        http_common_cmp_addresses (w->address,
+                                   w->addrlen,
+                                   saddr,
+                                   saddr_len))
+      break;
+    w = w->next;
   }
   GNUNET_free (saddr);
 
@@ -2301,10 +2324,9 @@
        http_common_plugin_address_to_string (plugin->protocol,
                                              w->address,
                                              w->addrlen));
-
-
-  GNUNET_CONTAINER_DLL_remove (plugin->addr_head, plugin->addr_tail, w);
-
+  GNUNET_CONTAINER_DLL_remove (plugin->addr_head,
+                               plugin->addr_tail,
+                               w);
   /* modify our published address list */
 #if BUILD_HTTPS
   address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
@@ -2325,16 +2347,17 @@
  * Our external IP address/port mapping has changed.
  *
  * @param cls closure, the 'struct LocalAddrList'
- * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO 
to mean
+ * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO 
to mean
  *     the previous (now invalid) one
  * @param addr either the previous or the new public IP address
  * @param addrlen actual lenght of the address
  */
 static void
-server_nat_port_map_callback (void *cls, int add_remove, const struct sockaddr 
*addr,
-                       socklen_t addrlen)
+server_nat_port_map_callback (void *cls,
+                              int add_remove,
+                              const struct sockaddr *addr,
+                              socklen_t addrlen)
 {
-  GNUNET_assert (cls != NULL);
   struct HTTP_Server_Plugin *plugin = cls;
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
@@ -2403,7 +2426,8 @@
 server_get_addresses (struct HTTP_Server_Plugin *plugin,
                       const char *service_name,
                       const struct GNUNET_CONFIGURATION_Handle *cfg,
-                      struct sockaddr ***addrs, socklen_t ** addr_lens)
+                      struct sockaddr ***addrs,
+                      socklen_t ** addr_lens)
 {
   int disablev6;
   unsigned long long port;
@@ -2591,7 +2615,8 @@
   socklen_t *addrlens;
 
   res = server_get_addresses (plugin,
-                              plugin->name, plugin->env->cfg,
+                              plugin->name,
+                              plugin->env->cfg,
                               &addrs, &addrlens);
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        _("Found %u addresses to report to NAT service\n"),
@@ -2604,7 +2629,9 @@
   }
 
   plugin->nat =
-      GNUNET_NAT_register (plugin->env->cfg, GNUNET_YES, plugin->port,
+      GNUNET_NAT_register (plugin->env->cfg,
+                           GNUNET_YES,
+                           plugin->port,
                            (unsigned int) res,
                            (const struct sockaddr **) addrs, addrlens,
                            &server_nat_port_map_callback, NULL, plugin);
@@ -2627,17 +2654,21 @@
 static void
 server_stop_report_addresses (struct HTTP_Server_Plugin *plugin)
 {
+  struct HttpAddressWrapper *w;
+
   /* Stop NAT handle */
   if (NULL != plugin->nat)
+  {
     GNUNET_NAT_unregister (plugin->nat);
-
+    plugin->nat = NULL;
+  }
   /* Clean up addresses */
-  struct HttpAddressWrapper *w;
-
-  while (plugin->addr_head != NULL)
+  while (NULL != plugin->addr_head)
   {
     w = plugin->addr_head;
-    GNUNET_CONTAINER_DLL_remove (plugin->addr_head, plugin->addr_tail, w);
+    GNUNET_CONTAINER_DLL_remove (plugin->addr_head,
+                                 plugin->addr_tail,
+                                 w);
     GNUNET_free (w->address);
     GNUNET_free (w);
   }
@@ -2648,7 +2679,7 @@
  * Check if IPv6 supported on this system
  *
  * @param plugin the plugin handle
- * @return GNUNET_YES on success, else GNUNET_NO
+ * @return #GNUNET_YES on success, else #GNUNET_NO
  */
 static int
 server_check_ipv6_support (struct HTTP_Server_Plugin *plugin)
@@ -2689,7 +2720,8 @@
  * @param tc task context (unused)
  */
 static void
-server_notify_external_hostname (void *cls, const struct 
GNUNET_SCHEDULER_TaskContext *tc)
+server_notify_external_hostname (void *cls,
+                                 const struct GNUNET_SCHEDULER_TaskContext *tc)
 {
   struct HTTP_Server_Plugin *plugin = cls;
   struct HttpAddress *ext_addr;
@@ -2737,7 +2769,7 @@
  * Configure the plugin
  *
  * @param plugin plugin handle
- * @return GNUNET_OK on success, GNUNET_SYSERR on failure
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
  */
 static int
 server_configure_plugin (struct HTTP_Server_Plugin *plugin)
@@ -2754,7 +2786,8 @@
       (plugin->env->cfg, plugin->name, "USE_IPv4"))
   {
     plugin->use_ipv4 =
-        GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, plugin->name,
+        GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg,
+                                              plugin->name,
                                               "USE_IPv4");
   }
   else
@@ -2768,7 +2801,8 @@
       (plugin->env->cfg, plugin->name, "USE_IPv6"))
   {
     plugin->use_ipv6 =
-        GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, plugin->name,
+        GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg,
+                                              plugin->name,
                                               "USE_IPv6");
   }
   else
@@ -2786,7 +2820,8 @@
 
   /* Reading port number from config file */
   if ((GNUNET_OK !=
-       GNUNET_CONFIGURATION_get_value_number (plugin->env->cfg, plugin->name,
+       GNUNET_CONFIGURATION_get_value_number (plugin->env->cfg,
+                                              plugin->name,
                                               "PORT", &port)) || (port > 
65535))
   {
     LOG (GNUNET_ERROR_TYPE_ERROR,
@@ -2830,7 +2865,8 @@
 
   if ((plugin->use_ipv6 == GNUNET_YES) &&
       (GNUNET_YES ==
-       GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg, plugin->name,
+       GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg,
+                                              plugin->name,
                                               "BINDTO6", &bind6_address)))
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG,
@@ -2861,85 +2897,100 @@
 
   plugin->verify_external_hostname = GNUNET_NO;
 #if BUILD_HTTPS
-  plugin->verify_external_hostname = GNUNET_CONFIGURATION_get_value_yesno 
(plugin->env->cfg, plugin->name,
+  plugin->verify_external_hostname = GNUNET_CONFIGURATION_get_value_yesno 
(plugin->env->cfg,
+                                                                           
plugin->name,
                                                                            
"VERIFY_EXTERNAL_HOSTNAME");
   if (GNUNET_SYSERR == plugin->verify_external_hostname)
        plugin->verify_external_hostname = GNUNET_NO;
   if (GNUNET_YES == plugin->verify_external_hostname)
        plugin->options |= HTTP_OPTIONS_VERIFY_CERTIFICATE;
 #endif
-  external_hostname_use_port = GNUNET_CONFIGURATION_get_value_yesno 
(plugin->env->cfg, plugin->name,
+  external_hostname_use_port = GNUNET_CONFIGURATION_get_value_yesno 
(plugin->env->cfg,
+                                                                     
plugin->name,
                                                                      
"EXTERNAL_HOSTNAME_USE_PORT");
   if (GNUNET_SYSERR == external_hostname_use_port)
        external_hostname_use_port = GNUNET_NO;
 
 
-  if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg, 
plugin->name,
-                                              "EXTERNAL_HOSTNAME", &eh_tmp))
+  if (GNUNET_YES ==
+      GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg,
+                                             plugin->name,
+                                             "EXTERNAL_HOSTNAME",
+                                             &eh_tmp))
   {
-      char * tmp = NULL;
-      char * pos = NULL;
-      char * pos_url = NULL;
+    char *tmp;
+    char *pos = NULL;
+    char *pos_url = NULL;
 
-      if (NULL != strstr(eh_tmp, "://"))
-      {
-          tmp = &strstr(eh_tmp, "://")[3];
-      }
-      else
-               tmp = eh_tmp;
+    if (NULL != strstr(eh_tmp, "://"))
+      tmp = &strstr(eh_tmp, "://")[3];
+    else
+      tmp = eh_tmp;
 
-      if (GNUNET_YES == external_hostname_use_port)
+    if (GNUNET_YES == external_hostname_use_port)
+    {
+      if ( (strlen (tmp) > 1) && (NULL != (pos = strchr(tmp, '/'))) )
       {
-        if ( (strlen (tmp) > 1) && (NULL != (pos = strchr(tmp, '/'))) )
-        {
-               pos_url = pos + 1;
-               pos[0] = '\0';
-               GNUNET_asprintf (&plugin->external_hostname, "%s:%u/%s", tmp, 
(uint16_t) port, (NULL == pos_url) ? "" : pos_url);
-        }
-        else
-               GNUNET_asprintf (&plugin->external_hostname, "%s:%u", tmp, 
(uint16_t) port);
+        pos_url = pos + 1;
+        pos[0] = '\0';
+        GNUNET_asprintf (&plugin->external_hostname,
+                         "%s:%u/%s",
+                         tmp,
+                         (uint16_t) port,
+                         (NULL == pos_url) ? "" : pos_url);
       }
       else
-       plugin->external_hostname = GNUNET_strdup (tmp);
-      GNUNET_free (eh_tmp);
+        GNUNET_asprintf (&plugin->external_hostname,
+                         "%s:%u",
+                         tmp,
+                         (uint16_t) port);
+    }
+    else
+      plugin->external_hostname = GNUNET_strdup (tmp);
+    GNUNET_free (eh_tmp);
 
-      LOG (GNUNET_ERROR_TYPE_INFO,
-           _("Using external hostname `%s'\n"),
-           plugin->external_hostname);
-      plugin->notify_ext_task = GNUNET_SCHEDULER_add_now 
(&server_notify_external_hostname, plugin);
+    LOG (GNUNET_ERROR_TYPE_INFO,
+         _("Using external hostname `%s'\n"),
+         plugin->external_hostname);
+    plugin->notify_ext_task = GNUNET_SCHEDULER_add_now 
(&server_notify_external_hostname,
+                                                        plugin);
 
-      /* Use only configured external hostname */
-      if (GNUNET_CONFIGURATION_have_value
-          (plugin->env->cfg, plugin->name, "EXTERNAL_HOSTNAME_ONLY"))
-      {
-        plugin->external_only =
-            GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, 
plugin->name,
-                                                  "EXTERNAL_HOSTNAME_ONLY");
-      }
-      else
-        plugin->external_only = GNUNET_NO;
+    /* Use only configured external hostname */
+    if (GNUNET_CONFIGURATION_have_value
+        (plugin->env->cfg,
+         plugin->name,
+         "EXTERNAL_HOSTNAME_ONLY"))
+    {
+      plugin->external_only =
+        GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg,
+                                              plugin->name,
+                                              "EXTERNAL_HOSTNAME_ONLY");
+    }
+    else
+      plugin->external_only = GNUNET_NO;
 
-      if (GNUNET_YES == plugin->external_only)
-        LOG (GNUNET_ERROR_TYPE_DEBUG,
-             _("Notifying transport only about hostname `%s'\n"),
-             plugin->external_hostname);
+    if (GNUNET_YES == plugin->external_only)
+      LOG (GNUNET_ERROR_TYPE_DEBUG,
+           _("Notifying transport only about hostname `%s'\n"),
+           plugin->external_hostname);
   }
   else
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "No external hostname configured\n");
 
   /* Optional parameters */
-  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (plugin->env->cfg,
-                      plugin->name,
-                      "MAX_CONNECTIONS", &max_connections))
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_number (plugin->env->cfg,
+                                             plugin->name,
+                                             "MAX_CONNECTIONS",
+                                             &max_connections))
     max_connections = 128;
   plugin->max_connections = max_connections;
 
- LOG (GNUNET_ERROR_TYPE_DEBUG,
-      _("Maximum number of connections is %u\n"),
-      plugin->max_connections);
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       _("Maximum number of connections is %u\n"),
+       plugin->max_connections);
 
-
   plugin->peer_id_length = strlen (GNUNET_i2s_full (plugin->env->my_identity));
 
   return GNUNET_OK;
@@ -2947,74 +2998,6 @@
 
 
 /**
- * Session was idle, so disconnect it
- *
- * @param cls the session
- * @param tc task context
- */
-static void
-server_session_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext 
*tc)
-{
-  struct Session *s = cls;
-
-  s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
-  GNUNET_log (TIMEOUT_LOG,
-              "Session %p was idle for %s, disconnecting\n",
-              s,
-             GNUNET_STRINGS_relative_time_to_string 
(HTTP_SERVER_SESSION_TIMEOUT,
-                                                     GNUNET_YES));
-
-  /* call session destroy function */
-  GNUNET_assert (GNUNET_OK ==
-                 http_server_plugin_disconnect_session (s->plugin, s));
-}
-
-
-/**
-* Start session timeout for session s
-*
-* @param s the session
-*/
-static void
-server_start_session_timeout (struct Session *s)
-{
- GNUNET_assert (NULL != s);
- GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s->timeout_task);
- s->timeout_task =  GNUNET_SCHEDULER_add_delayed (HTTP_SERVER_SESSION_TIMEOUT,
-                                                  &server_session_timeout,
-                                                  s);
- GNUNET_log (TIMEOUT_LOG,
-             "Timeout for session %p set to %s\n",
-             s,
-            GNUNET_STRINGS_relative_time_to_string 
(HTTP_SERVER_SESSION_TIMEOUT,
-                                                    GNUNET_YES));
-}
-
-
-/**
-* Increment session timeout due to activity session s
-*
-* @param s the session
-*/
-static void
-server_reschedule_session_timeout (struct Session *s)
-{
- GNUNET_assert (NULL != s);
- GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s->timeout_task);
-
- GNUNET_SCHEDULER_cancel (s->timeout_task);
- s->timeout_task =  GNUNET_SCHEDULER_add_delayed (HTTP_SERVER_SESSION_TIMEOUT,
-                                                  &server_session_timeout,
-                                                  s);
- GNUNET_log (TIMEOUT_LOG,
-             "Timeout rescheduled for session %p set to %s\n",
-             s,
-            GNUNET_STRINGS_relative_time_to_string 
(HTTP_SERVER_SESSION_TIMEOUT,
-                                                    GNUNET_YES));
-}
-
-
-/**
  * Exit point from the plugin.
  *
  * @param cls api
@@ -3025,8 +3008,6 @@
 {
   struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
   struct HTTP_Server_Plugin *plugin = api->cls;
-  struct Session *pos;
-  struct Session *next;
 
   if (NULL == api->cls)
   {
@@ -3068,29 +3049,17 @@
   /* Stop to report addresses to transport service */
   server_stop_report_addresses (plugin);
   server_stop (plugin);
-  next = plugin->head;
-  while (NULL != (pos = next))
-  {
-    next = pos->next;
-    LOG (GNUNET_ERROR_TYPE_DEBUG,
-         "Removing left over session %p\n",
-         pos);
-
-    if ((GNUNET_YES == pos->session_passed) && (GNUNET_NO == 
pos->session_ended))
-    {
-      /* Notify transport immediately that this session is invalid */
-      pos->session_ended = GNUNET_YES;
-      plugin->env->session_end (plugin->env->cls, pos->address, pos);
-    }
-    server_delete_session (plugin, pos);
-  }
-
+  GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
+                                         &destroy_session_cb,
+                                         plugin);
+  GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
+  plugin->sessions = NULL;
   /* Clean up */
   GNUNET_free_non_null (plugin->external_hostname);
   GNUNET_free_non_null (plugin->ext_addr);
   GNUNET_free_non_null (plugin->server_addr_v4);
   GNUNET_free_non_null (plugin->server_addr_v6);
-  regfree(&plugin->url_regex);
+  regfree (&plugin->url_regex);
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        _("Shutdown for plugin `%s' complete\n"),
@@ -3136,12 +3105,67 @@
 http_server_get_network (void *cls,
                         struct Session *session)
 {
-  GNUNET_assert (NULL != session);
   return ntohl (session->ats_address_network_type);
 }
 
 
 /**
+ * Return information about the given session to the
+ * monitor callback.
+ *
+ * @param cls the `struct Plugin` with the monitor callback (`sic`)
+ * @param peer peer we send information about
+ * @param value our `struct Session` to send information about
+ * @return #GNUNET_OK (continue to iterate)
+ */
+static int
+send_session_info_iter (void *cls,
+                        const struct GNUNET_PeerIdentity *peer,
+                        void *value)
+{
+  struct HTTP_Server_Plugin *plugin = cls;
+  struct Session *session = value;
+
+  notify_session_monitor (plugin,
+                          session,
+                          GNUNET_TRANSPORT_SS_UP);
+  return GNUNET_OK;
+}
+
+
+/**
+ * Begin monitoring sessions of a plugin.  There can only
+ * be one active monitor per plugin (i.e. if there are
+ * multiple monitors, the transport service needs to
+ * multiplex the generated events over all of them).
+ *
+ * @param cls closure of the plugin
+ * @param sic callback to invoke, NULL to disable monitor;
+ *            plugin will being by iterating over all active
+ *            sessions immediately and then enter monitor mode
+ * @param sic_cls closure for @a sic
+ */
+static void
+http_server_plugin_setup_monitor (void *cls,
+                                  GNUNET_TRANSPORT_SessionInfoCallback sic,
+                                  void *sic_cls)
+{
+  struct HTTP_Server_Plugin *plugin = cls;
+
+  plugin->sic = sic;
+  plugin->sic_cls = sic_cls;
+  if (NULL != sic)
+  {
+    GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
+                                           &send_session_info_iter,
+                                           plugin);
+    /* signal end of first iteration */
+    sic (sic_cls, NULL, NULL);
+  }
+}
+
+
+/**
  * Entry point for the plugin.
  *
  * @param cls env
@@ -3167,6 +3191,8 @@
   }
   plugin = GNUNET_new (struct HTTP_Server_Plugin);
   plugin->env = env;
+  plugin->sessions = GNUNET_CONTAINER_multipeermap_create (128,
+                                                           GNUNET_YES);
   api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
   api->cls = plugin;
   api->send = &http_server_plugin_send;
@@ -3181,6 +3207,8 @@
   api->address_pretty_printer = &http_common_plugin_address_pretty_printer;
   api->get_network = &http_server_get_network;
   api->update_session_timeout = &http_server_plugin_update_session_timeout;
+  // api->update_inbound_delay = &http_server_plugin_update_inbound_delay; // 
FIXME: implement/support!
+  api->setup_monitor = &http_server_plugin_setup_monitor;
 #if BUILD_HTTPS
   plugin->name = "transport-https_server";
   plugin->protocol = "https";

Modified: gnunet/src/transport/test_transport_api_http_reverse_peer1.conf
===================================================================
--- gnunet/src/transport/test_transport_api_http_reverse_peer1.conf     
2014-06-23 21:40:20 UTC (rev 33807)
+++ gnunet/src/transport/test_transport_api_http_reverse_peer1.conf     
2014-06-23 21:48:38 UTC (rev 33808)
@@ -1,4 +1,4 @@
-INLINE@ template_cfg_peer1.conf
address@hidden@ template_cfg_peer1.conf
 [PATHS]
 GNUNET_TEST_HOME = /tmp/test-transport/api-http-p1/
 

Modified: gnunet/src/transport/test_transport_api_http_reverse_peer2.conf
===================================================================
--- gnunet/src/transport/test_transport_api_http_reverse_peer2.conf     
2014-06-23 21:40:20 UTC (rev 33807)
+++ gnunet/src/transport/test_transport_api_http_reverse_peer2.conf     
2014-06-23 21:48:38 UTC (rev 33808)
@@ -1,4 +1,4 @@
-INLINE@ template_cfg_peer2.conf
address@hidden@ template_cfg_peer2.conf
 [PATHS]
 GNUNET_TEST_HOME = /tmp/test-transport/api-http-p2/
 

Modified: gnunet/src/transport/transport-testing.c
===================================================================
--- gnunet/src/transport/transport-testing.c    2014-06-23 21:40:20 UTC (rev 
33807)
+++ gnunet/src/transport/transport-testing.c    2014-06-23 21:48:38 UTC (rev 
33808)
@@ -259,8 +259,8 @@
 
   /* Create configuration and call testing lib to modify it */
   p->cfg = GNUNET_CONFIGURATION_create ();
-  GNUNET_assert (GNUNET_OK == GNUNET_CONFIGURATION_load (p->cfg, cfgname));
-
+  GNUNET_assert (GNUNET_OK ==
+                 GNUNET_CONFIGURATION_load (p->cfg, cfgname));
   if (GNUNET_SYSERR == GNUNET_TESTING_configuration_create (tth->tl_system, 
p->cfg))
   {
     LOG (GNUNET_ERROR_TYPE_ERROR,

Modified: gnunet/src/transport/transport.conf.in
===================================================================
--- gnunet/src/transport/transport.conf.in      2014-06-23 21:40:20 UTC (rev 
33807)
+++ gnunet/src/transport/transport.conf.in      2014-06-23 21:48:38 UTC (rev 
33808)
@@ -68,11 +68,11 @@
 # PROXY =
 
 # User name for proxy server
-# PROXY_USERNAME = 
+# PROXY_USERNAME =
 # User password for proxy server
-# PROXY_PASSWORD = 
+# PROXY_PASSWORD =
 
-# Type of proxy server, 
+# Type of proxy server,
 # Valid values: HTTP, SOCKS4, SOCKS5, SOCKS4A, SOCKS5_HOSTNAME
 # Default: HTTP
 # PROXY_TYPE = HTTP
@@ -95,11 +95,11 @@
 # PROXY =
 
 # User name for proxy server
-# PROXY_USERNAME = 
+# PROXY_USERNAME =
 # User password for proxy server
-# PROXY_PASSWORD = 
+# PROXY_PASSWORD =
 
-# Type of proxy server, 
+# Type of proxy server,
 # Valid values: HTTP, SOCKS4, SOCKS5, SOCKS4A, SOCKS5_HOSTNAME
 # Default: HTTP
 # PROXY_TYPE = HTTP




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