Introduced limited per connection queue size
[oweals/gnunet.git] / src / transport / plugin_transport_http.c
index cdbc900f524b1aa86ebf848d33164bd5bbd72bdb..0238746bce8d2642d38b860c7c4dbe3b1d339cb9 100644 (file)
 #define PROTOCOL_PREFIX "http"
 #endif
 
-#define DEBUG_HTTP GNUNET_YES
+#define DEBUG_HTTP GNUNET_NO
 #define DEBUG_CURL GNUNET_NO
 #define DEBUG_MHD GNUNET_NO
 #define DEBUG_CONNECTIONS GNUNET_NO
 #define DEBUG_SESSION_SELECTION GNUNET_NO
-
+#define DEBUG_SCHEDULING GNUNET_NO
 #define CURL_TCP_NODELAY GNUNET_YES
 
 #define INBOUND GNUNET_NO
@@ -316,6 +316,17 @@ struct Session
    * inbound session: mhd_connection *
    */
   void * recv_endpoint;
+
+  /**
+   * Current queue size
+   */
+  size_t queue_length_cur;
+
+  /**
+       * Max queue size
+       */
+  size_t queue_length_max;
+
 };
 
 /**
@@ -406,6 +417,7 @@ struct Plugin
    */
   void * mhd_log;
 
+  /* only needed for HTTPS plugin */
 #if BUILD_HTTPS
   /* The certificate MHD uses as an \0 terminated string */
   char * cert;
@@ -449,12 +461,12 @@ static void http_server_daemon_v6_run (void *cls, const struct GNUNET_SCHEDULER_
 
 /**
  * Function setting up curl handle and selecting message to send
- * @param cls plugin
+ * @param plugin plugin
  * @param ses session to send data to
  * @param con connection
  * @return bytes sent to peer
  */
-static ssize_t send_check_connections (void *cls, struct Session *ps);
+static int send_check_connections (struct Plugin *plugin, struct Session *ps);
 
 /**
  * Function setting up file descriptors and scheduling task to run
@@ -462,20 +474,19 @@ static ssize_t send_check_connections (void *cls, struct Session *ps);
  * @param ses session to send data to
  * @param
  */
-static int curl_schedule(void *cls );
+static int curl_schedule (struct Plugin *plugin);
 
 
 /**
  * Creates a valid url from passed address and id
- * @param cls plugin as closure
+ * @param plugin plugin
  * @param addr address to create url from
  * @param addrlen address lenth
  * @param id session id
  * @return the created url
  */
-static char * create_url(void * cls, const void * addr, size_t addrlen, size_t id)
+static char * create_url(struct Plugin *plugin, const void * addr, size_t addrlen, size_t id)
 {
-  struct Plugin *plugin = cls;
   char *url = NULL;
   char *addr_str = (char *) http_plugin_address_to_string(NULL, addr, addrlen);
 
@@ -503,8 +514,8 @@ static int remove_http_message (struct Session * ps, struct HTTP_Message * msg)
 /**
  * Iterator to remove peer context
  * @param cls the plugin
- * @key the peers public key hashcode
- * @value the peer context
+ * @param key the peers public key hashcode
+ * @param value the peer context
  * @return GNUNET_YES on success
  */
 int remove_peer_context_Iterator (void *cls, const GNUNET_HashCode *key, void *value)
@@ -720,19 +731,14 @@ void mhd_logger (void * arg, const char * fmt, va_list ap)
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"MHD: %s \n", text);
 }
 
-/**
- * Callback called by MHD when a connection is terminated
- * @param cls closure
- * @param connection the terminated connection
- * @httpSessionCache the mhd session reference
- */
+
 static void mhd_termination_cb (void *cls, struct MHD_Connection * connection, void **httpSessionCache)
 {
   struct Session * ps = *httpSessionCache;
   if (ps == NULL)
     return;
   struct HTTP_PeerContext * pc = ps->peercontext;
-
+        
   if (connection==ps->recv_endpoint)
   {
 #if DEBUG_CONNECTIONS
@@ -806,8 +812,7 @@ static void mhd_write_mst_cb (void *cls,
  *
  */
 static int
-mhd_accept_cb (void *cls,
-                      const struct sockaddr *addr, socklen_t addr_len)
+mhd_accept_cb (void *cls, const struct sockaddr *addr, socklen_t addr_len)
 {
 #if 0
   struct Plugin *plugin = cls;
@@ -825,13 +830,16 @@ mhd_accept_cb (void *cls,
  * @param max max number of bytes available in buffer
  * @return bytes written to buffer
  */
-int mhd_send_callback (void *cls, uint64_t pos, char *buf, int max)
+static ssize_t
+mhd_send_callback (void *cls, uint64_t pos, char *buf, size_t max)
 {
-  int bytes_read = 0;
   struct Session * ps = cls;
   struct HTTP_PeerContext * pc;
   struct HTTP_Message * msg;
+  int bytes_read = 0;
+
   GNUNET_assert (ps!=NULL);
+
   pc = ps->peercontext;
   msg = ps->pending_msgs_tail;
   if (ps->send_force_disconnect==GNUNET_YES)
@@ -861,6 +869,7 @@ int mhd_send_callback (void *cls, uint64_t pos, char *buf, int max)
     {
       if (NULL!=msg->transmit_cont)
         msg->transmit_cont (msg->transmit_cont_cls,&pc->identity,GNUNET_OK);
+      ps->queue_length_cur -= msg->size;
       remove_http_message(ps,msg);
     }
   }
@@ -876,12 +885,12 @@ int mhd_send_callback (void *cls, uint64_t pos, char *buf, int max)
  */
 static int
 mdh_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 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 Plugin *plugin = cls;
   struct MHD_Response *response;
@@ -1020,6 +1029,8 @@ mdh_access_cb (void *cls,
       ps->recv_active=GNUNET_NO;
       ps->peercontext=pc;
       ps->session_id =id_num;
+         ps->queue_length_cur = 0;
+         ps->queue_length_max = GNUNET_SERVER_MAX_MESSAGE_SIZE;
       ps->url = create_url (plugin, ps->addr, ps->addrlen, ps->session_id);
       GNUNET_CONTAINER_DLL_insert(pc->head,pc->tail,ps);
       GNUNET_STATISTICS_update (plugin->env->stats,
@@ -1114,14 +1125,13 @@ mdh_access_cb (void *cls,
 /**
  * Function that queries MHD's select sets and
  * starts the task waiting for them.
- * @param cls plugin as closure
+ * @param plugin plugin
  * @param daemon_handle the MHD daemon handle
  * @return gnunet task identifier
  */
 static GNUNET_SCHEDULER_TaskIdentifier
-http_server_daemon_prepare (void * cls, struct MHD_Daemon *daemon_handle)
+http_server_daemon_prepare (struct Plugin *plugin , struct MHD_Daemon *daemon_handle)
 {
-  struct Plugin *plugin = cls;
   GNUNET_SCHEDULER_TaskIdentifier ret;
   fd_set rs;
   fd_set ws;
@@ -1134,7 +1144,6 @@ http_server_daemon_prepare (void * cls, struct MHD_Daemon *daemon_handle)
   int haveto;
   struct GNUNET_TIME_Relative tv;
 
-  GNUNET_assert(cls !=NULL);
   ret = GNUNET_SCHEDULER_NO_TASK;
   FD_ZERO(&rs);
   FD_ZERO(&ws);
@@ -1153,7 +1162,7 @@ http_server_daemon_prepare (void * cls, struct MHD_Daemon *daemon_handle)
   if (haveto == MHD_YES)
     tv.value = (uint64_t) timeout;
   else
-    tv = GNUNET_TIME_UNIT_FOREVER_REL;
+    tv = GNUNET_TIME_UNIT_SECONDS;
   GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max);
   GNUNET_NETWORK_fdset_copy_native (wws, &ws, max);
   GNUNET_NETWORK_fdset_copy_native (wes, &es, max);
@@ -1208,6 +1217,19 @@ static void http_server_daemon_v4_run (void *cls,
 {
   struct Plugin *plugin = cls;
 
+#if DEBUG_SCHEDULING
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY))
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v4_run: GNUNET_SCHEDULER_REASON_READ_READY\n");      
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY)) 
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v4_run: GNUNET_SCHEDULER_REASON_WRITE_READY\n");  
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_TIMEOUT))
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v4_run: GNUNET_SCHEDULER_REASON_TIMEOUT\n");
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_STARTUP))
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v4_run: GGNUNET_SCHEDULER_REASON_STARTUP\n");        
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v4_run: GGNUNET_SCHEDULER_REASON_SHUTDOWN\n");                 
+#endif              
+      
   GNUNET_assert(cls !=NULL);
   plugin->http_server_task_v4 = GNUNET_SCHEDULER_NO_TASK;
 
@@ -1229,6 +1251,19 @@ static void http_server_daemon_v6_run (void *cls,
                              const struct GNUNET_SCHEDULER_TaskContext *tc)
 {
   struct Plugin *plugin = cls;
+  
+#if DEBUG_SCHEDULING  
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY))
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v6_run: GNUNET_SCHEDULER_REASON_READ_READY\n");
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY)) 
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v6_run: GNUNET_SCHEDULER_REASON_WRITE_READY\n");
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_TIMEOUT))
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v6_run: GNUNET_SCHEDULER_REASON_TIMEOUT\n");
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_STARTUP))  
+     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v6_run: GGNUNET_SCHEDULER_REASON_STARTUP\n");    
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))  
+     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v6_run: GGNUNET_SCHEDULER_REASON_SHUTDOWN\n"); 
+#endif                                            
 
   GNUNET_assert(cls !=NULL);
   plugin->http_server_task_v6 = GNUNET_SCHEDULER_NO_TASK;
@@ -1410,11 +1445,12 @@ static size_t curl_send_cb(void *stream, size_t size, size_t nmemb, void *ptr)
   if ( msg->pos == msg->size)
   {
 #if DEBUG_CONNECTIONS
-    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: Message with %u bytes sent, removing message from queue \n",ps, msg->pos);
+         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"Connection %X: Message with %u bytes sent, removing message from queue \n",ps, msg->pos);
 #endif
     /* Calling transmit continuation  */
     if (NULL != ps->pending_msgs_tail->transmit_cont)
       msg->transmit_cont (ps->pending_msgs_tail->transmit_cont_cls,&(ps->peercontext)->identity,GNUNET_OK);
+    ps->queue_length_cur -= msg->size;
     remove_http_message(ps, msg);
   }
   return bytes_sent;
@@ -1512,9 +1548,14 @@ static void curl_handle_finished (struct Plugin *plugin)
                                curl_multi_remove_handle(plugin->multi_handle,ps->send_endpoint);
                                //curl_easy_cleanup(ps->send_endpoint);
                                //ps->send_endpoint=NULL;
-                               cur_msg = ps->pending_msgs_tail;
-                               if (( NULL != cur_msg) && ( NULL != cur_msg->transmit_cont))
-                                 cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_SYSERR);
+                               while (ps->pending_msgs_tail != NULL)
+                               {
+                                       cur_msg = ps->pending_msgs_tail;
+                                       if ( NULL != cur_msg->transmit_cont)
+                                         cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_SYSERR);
+                                       ps->queue_length_cur -= cur_msg->size;
+                                       remove_http_message(ps,cur_msg);
+                               }
                          }
                          /* GET connection failed */
                          if (msg->easy_handle == ps->recv_endpoint)
@@ -1549,19 +1590,25 @@ static void curl_handle_finished (struct Plugin *plugin)
                                                         http_result);
        #endif
                                /* Calling transmit continuation  */
-                               cur_msg = ps->pending_msgs_tail;
-                               if (( NULL != cur_msg) && (NULL != cur_msg->transmit_cont))
+                               while (ps->pending_msgs_tail != NULL)
                                {
-                                 /* HTTP 1xx : Last message before here was informational */
-                                 if ((http_result >=100) && (http_result < 200))
-                                       cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_OK);
-                                 /* HTTP 2xx: successful operations */
-                                 if ((http_result >=200) && (http_result < 300))
-                                       cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_OK);
-                                 /* HTTP 3xx..5xx: error */
-                                 if ((http_result >=300) && (http_result < 600))
-                                       cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_SYSERR);
+                                       cur_msg = ps->pending_msgs_tail;
+                                       if ( NULL != cur_msg->transmit_cont)
+                                       {
+                                                 /* HTTP 1xx : Last message before here was informational */
+                                                 if ((http_result >=100) && (http_result < 200))
+                                                       cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_OK);
+                                                 /* HTTP 2xx: successful operations */
+                                                 if ((http_result >=200) && (http_result < 300))
+                                                       cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_OK);
+                                                 /* HTTP 3xx..5xx: error */
+                                                 if ((http_result >=300) && (http_result < 600))
+                                                       cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_SYSERR);
+                                       }
+                                       ps->queue_length_cur -= cur_msg->size;
+                                       remove_http_message(ps,cur_msg);
                                }
+
                                ps->send_connected = GNUNET_NO;
                                ps->send_active = GNUNET_NO;
                                curl_multi_remove_handle(plugin->multi_handle,ps->send_endpoint);
@@ -1611,12 +1658,9 @@ static void curl_perform (void *cls,
 
   GNUNET_assert(cls !=NULL);
 
-
-
   plugin->http_curl_task = GNUNET_SCHEDULER_NO_TASK;
   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
     return;
-
   do
     {
       running = 0;
@@ -1626,7 +1670,6 @@ static void curl_perform (void *cls,
       handles_last_run = running;
     }
   while (mret == CURLM_CALL_MULTI_PERFORM);
-
   curl_schedule(plugin);
 }
 
@@ -1634,12 +1677,11 @@ static void curl_perform (void *cls,
 /**
  * Function setting up file descriptors and scheduling task to run
  *
- * @param cls plugin as closure
+ * @param plugin plugin as closure
  * @return GNUNET_SYSERR for hard failure, GNUNET_OK for ok
  */
-static int curl_schedule(void *cls)
+static int curl_schedule(struct Plugin *plugin)
 {
-  struct Plugin *plugin = cls;
   fd_set rs;
   fd_set ws;
   fd_set es;
@@ -1649,8 +1691,6 @@ static int curl_schedule(void *cls)
   long to;
   CURLMcode mret;
 
-  GNUNET_assert(cls !=NULL);
-
   /* Cancel previous scheduled task */
   if (plugin->http_curl_task !=  GNUNET_SCHEDULER_NO_TASK)
   {
@@ -1698,23 +1738,48 @@ static int curl_schedule(void *cls)
   return GNUNET_OK;
 }
 
+/**
+ * Function to log curl debug messages with GNUNET_log
+ * @param curl handle
+ * @param type curl_infotype
+ * @param data data
+ * @param size size
+ * @param cls  closure
+ * @return 0
+ */
+int curl_logger (CURL * curl, curl_infotype type , char * data, size_t size , void * cls)
+{
+
+       if (type == CURLINFO_TEXT)
+       {
+               char text[size+2];
+               memcpy(text,data,size);
+               if (text[size-1] == '\n')
+                       text[size] = '\0';
+               else
+               {
+                       text[size] = '\n';
+                       text[size+1] = '\0';
+               }
+               GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"CURL: Connection %X - %s", cls, text);
+       }
+       return 0;
+}
+
 /**
  * Function setting up curl handle and selecting message to send
  *
- * @param cls plugin
+ * @param plugin plugin
  * @param ps session
  * @return GNUNET_SYSERR on failure, GNUNET_NO if connecting, GNUNET_YES if ok
  */
-static ssize_t send_check_connections (void *cls, struct Session *ps)
+static int send_check_connections (struct Plugin *plugin, struct Session *ps)
 {
-  struct Plugin *plugin = cls;
   CURLMcode mret;
   struct HTTP_Message * msg;
 
   struct GNUNET_TIME_Relative timeout = GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT;
 
-  GNUNET_assert(cls !=NULL);
-
   if (ps->direction == OUTBOUND)
   {
     /* RECV DIRECTION */
@@ -1729,6 +1794,8 @@ static ssize_t send_check_connections (void *cls, struct Session *ps)
         }
 #if DEBUG_CURL
         curl_easy_setopt(ps->recv_endpoint, CURLOPT_VERBOSE, 1L);
+        curl_easy_setopt(ps->recv_endpoint, CURLOPT_DEBUGFUNCTION , &curl_logger);
+        curl_easy_setopt(ps->recv_endpoint, CURLOPT_DEBUGDATA , ps->recv_endpoint);
 #endif
 #if BUILD_HTTPS
         curl_easy_setopt (ps->recv_endpoint, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
@@ -1825,6 +1892,8 @@ static ssize_t send_check_connections (void *cls, struct Session *ps)
 
 #if DEBUG_CURL
                curl_easy_setopt(ps->send_endpoint, CURLOPT_VERBOSE, 1L);
+        curl_easy_setopt(ps->send_endpoint, CURLOPT_DEBUGFUNCTION , &curl_logger);
+        curl_easy_setopt(ps->send_endpoint, CURLOPT_DEBUGDATA , ps->send_endpoint);
 #endif
 #if BUILD_HTTPS
         curl_easy_setopt (ps->send_endpoint, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
@@ -1882,7 +1951,6 @@ static ssize_t send_check_connections (void *cls, struct Session *ps)
 /**
  * select best session to transmit data to peer
  *
- * @param cls closure
  * @param pc peer context of target peer
  * @param addr address of target peer
  * @param addrlen address length
@@ -1891,7 +1959,7 @@ static ssize_t send_check_connections (void *cls, struct Session *ps)
  * @return selected session
  *
  */
-static struct Session * send_select_session (void * cls, struct HTTP_PeerContext *pc, const void * addr, size_t addrlen, int force_address, struct Session * session)
+static struct Session * send_select_session (struct HTTP_PeerContext *pc, const void * addr, size_t addrlen, int force_address, struct Session * session)
 {
        struct Session * tmp = NULL;
        int addr_given = GNUNET_NO;
@@ -2091,73 +2159,81 @@ http_plugin_send (void *cls,
                            GNUNET_NO);
   }
 
-  ps = send_select_session (plugin, pc, addr, addrlen, force_address, session);
+  ps = send_select_session (pc, addr, addrlen, force_address, session);
 
   /* session not existing, but address forced -> creating new session */
   if (ps==NULL)
   {
-    if ((addr!=NULL) && (addrlen!=0))
-    {
+       if ((addr!=NULL) && (addrlen!=0))
+       {
       ps = GNUNET_malloc(sizeof (struct Session));
 #if DEBUG_SESSION_SELECTION
       if (force_address == GNUNET_YES)
-        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No existing connection & forced address: creating new session %X to peer %s\n", ps, GNUNET_i2s(target));
+         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No existing connection & forced address: creating new session %X to peer %s\n", ps, GNUNET_i2s(target));
       if (force_address != GNUNET_YES)
-        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No existing connection: creating new session %X to peer %s\n", ps, GNUNET_i2s(target));
+         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No existing connection: creating new session %X to peer %s\n", ps, GNUNET_i2s(target));
 #endif
       if ((addrlen!=0) && (addr!=NULL))
       {
-      ps->addr = GNUNET_malloc(addrlen);
-      memcpy(ps->addr,addr,addrlen);
-      ps->addrlen = addrlen;
-      }
-      else
-      {
-        ps->addr = NULL;
-        ps->addrlen = 0;
+         ps->addr = GNUNET_malloc(addrlen);
+         memcpy(ps->addr,addr,addrlen);
+         ps->addrlen = addrlen;
       }
-      ps->direction=OUTBOUND;
-      ps->recv_connected = GNUNET_NO;
-      ps->recv_force_disconnect = GNUNET_NO;
-      ps->send_connected = GNUNET_NO;
-      ps->send_force_disconnect = GNUNET_NO;
-      ps->pending_msgs_head = NULL;
-      ps->pending_msgs_tail = NULL;
-      ps->peercontext=pc;
-      ps->session_id = pc->session_id_counter;
-      pc->session_id_counter++;
-      ps->url = create_url (plugin, ps->addr, ps->addrlen, ps->session_id);
-      if (ps->msgtok == NULL)
-        ps->msgtok = GNUNET_SERVER_mst_create (&curl_receive_mst_cb, ps);
-      GNUNET_CONTAINER_DLL_insert(pc->head,pc->tail,ps);
-/* FIXME */
-
-      GNUNET_STATISTICS_update (plugin->env->stats,
-                           gettext_noop ("# HTTP outbound sessions for peers active"),
-                           1,
-                           GNUNET_NO);
-    }
-    else
-    {
+         else
+         {
+               ps->addr = NULL;
+               ps->addrlen = 0;
+         }
+         ps->direction=OUTBOUND;
+         ps->recv_connected = GNUNET_NO;
+         ps->recv_force_disconnect = GNUNET_NO;
+         ps->send_connected = GNUNET_NO;
+         ps->send_force_disconnect = GNUNET_NO;
+         ps->pending_msgs_head = NULL;
+         ps->pending_msgs_tail = NULL;
+         ps->peercontext=pc;
+         ps->session_id = pc->session_id_counter;
+         ps->queue_length_cur = 0;
+         ps->queue_length_max = GNUNET_SERVER_MAX_MESSAGE_SIZE;
+         pc->session_id_counter++;
+         ps->url = create_url (plugin, ps->addr, ps->addrlen, ps->session_id);
+         if (ps->msgtok == NULL)
+                       ps->msgtok = GNUNET_SERVER_mst_create (&curl_receive_mst_cb, ps);
+         GNUNET_CONTAINER_DLL_insert(pc->head,pc->tail,ps);
+         GNUNET_STATISTICS_update (plugin->env->stats,
+                                                               gettext_noop ("# HTTP outbound sessions for peers active"),
+                                                               1,
+                                                               GNUNET_NO);
+       }
+       else
+       {
 #if DEBUG_HTTP
-      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No existing session found & and no address given: no way to send this message to peer `%s'!\n", GNUNET_i2s(target));
+               GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No existing session found & and no address given: no way to send this message to peer `%s'!\n", GNUNET_i2s(target));
 #endif
-      return GNUNET_SYSERR;
+               return GNUNET_SYSERR;
     }
   }
 
-  /* create msg */
-  msg = GNUNET_malloc (sizeof (struct HTTP_Message) + msgbuf_size);
-  msg->next = NULL;
-  msg->size = msgbuf_size;
-  msg->pos = 0;
-  msg->buf = (char *) &msg[1];
-  msg->transmit_cont = cont;
-  msg->transmit_cont_cls = cont_cls;
-  memcpy (msg->buf,msgbuf, msgbuf_size);
-  GNUNET_CONTAINER_DLL_insert(ps->pending_msgs_head,ps->pending_msgs_tail,msg);
-
-  if (send_check_connections (plugin, ps) == GNUNET_SYSERR)
+  if (msgbuf_size >= (ps->queue_length_max - ps->queue_length_cur))
+  {
+       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"Queue %X full: (%u) bytes in queue, would discard message (%u)\n", ps, (ps->queue_length_max - ps->queue_length_cur), msgbuf_size);
+       //return GNUNET_SYSERR;
+  }
+
+       /* create msg */
+       msg = GNUNET_malloc (sizeof (struct HTTP_Message) + msgbuf_size);
+       msg->next = NULL;
+       msg->size = msgbuf_size;
+       msg->pos = 0;
+       msg->buf = (char *) &msg[1];
+       msg->transmit_cont = cont;
+       msg->transmit_cont_cls = cont_cls;
+       memcpy (msg->buf,msgbuf, msgbuf_size);
+
+       GNUNET_CONTAINER_DLL_insert(ps->pending_msgs_head,ps->pending_msgs_tail,msg);
+       ps->queue_length_cur += msgbuf_size;
+
+       if (send_check_connections (plugin, ps) == GNUNET_SYSERR)
          return GNUNET_SYSERR;
          if (force_address != GNUNET_YES)
                  pc->last_session = ps;
@@ -2444,7 +2520,6 @@ LIBGNUNET_PLUGIN_TRANSPORT_DONE (void *cls)
     plugin->http_server_task_v6 = GNUNET_SCHEDULER_NO_TASK;
   }
 
-
   /* free all peer information */
   if (plugin->peers!=NULL)
   {
@@ -2605,15 +2680,18 @@ LIBGNUNET_PLUGIN_TRANSPORT_INIT (void *cls)
          plugin->bind4_address->sin_family = AF_INET;
          plugin->bind4_address->sin_port = htons (port);
 
-         if (inet_pton(AF_INET,plugin->bind_hostname, &plugin->bind4_address->sin_addr)<=0)
+         if (plugin->bind_hostname!=NULL)
          {
-                 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
-                                                  component_name,
-                                                  _("Misconfigured address to bind to in configuration!\n"));
-                 GNUNET_free(plugin->bind4_address);
-                 GNUNET_free(plugin->bind_hostname);
-                 plugin->bind_hostname = NULL;
-                 plugin->bind4_address = NULL;
+                 if (inet_pton(AF_INET,plugin->bind_hostname, &plugin->bind4_address->sin_addr)<=0)
+                 {
+                         GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
+                                                          component_name,
+                                                          _("Misconfigured address to bind to in configuration!\n"));
+                         GNUNET_free(plugin->bind4_address);
+                         GNUNET_free(plugin->bind_hostname);
+                         plugin->bind_hostname = NULL;
+                         plugin->bind4_address = NULL;
+                 }
          }
   }
 
@@ -2629,16 +2707,18 @@ LIBGNUNET_PLUGIN_TRANSPORT_INIT (void *cls)
                  plugin->bind6_address = GNUNET_malloc(sizeof(struct sockaddr_in6));
                  plugin->bind6_address->sin6_family = AF_INET6;
                  plugin->bind6_address->sin6_port = htons (port);
-
-                 if (inet_pton(AF_INET6,plugin->bind_hostname, &plugin->bind6_address->sin6_addr)<=0)
+                 if (plugin->bind_hostname!=NULL)
                  {
-                         GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
-                                                          component_name,
-                                                          _("Misconfigured address to bind to in configuration!\n"));
-                         GNUNET_free(plugin->bind6_address);
-                         GNUNET_free(plugin->bind_hostname);
-                         plugin->bind_hostname = NULL;
-                         plugin->bind6_address = NULL;
+                         if (inet_pton(AF_INET6,plugin->bind_hostname, &plugin->bind6_address->sin6_addr)<=0)
+                         {
+                                 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
+                                                                  component_name,
+                                                                  _("Misconfigured address to bind to in configuration!\n"));
+                                 GNUNET_free(plugin->bind6_address);
+                                 GNUNET_free(plugin->bind_hostname);
+                                 plugin->bind_hostname = NULL;
+                                 plugin->bind6_address = NULL;
+                         }
                  }
          }
   }
@@ -2730,11 +2810,9 @@ LIBGNUNET_PLUGIN_TRANSPORT_INIT (void *cls)
                  return NULL;
          }
   }
-
   GNUNET_free (key_file);
   GNUNET_free (cert_file);
 
-
   GNUNET_assert((plugin->key!=NULL) && (plugin->cert!=NULL));
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "TLS certificate loaded\n");
 #endif