/*
This file is part of GNUnet.
- (C) 2009 Christian Grothoff (and other contributing authors)
+ (C) 2009, 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
#include "platform.h"
#include "gnunet_common.h"
-#include "gnunet_connection_lib.h"
-#include "gnunet_scheduler_lib.h"
-#include "gnunet_server_lib.h"
-#include "gnunet_time_lib.h"
-#include "gnunet_disk_lib.h"
+#include "gnunet_util_lib.h"
#include "gnunet_protocols.h"
-#define DEBUG_SERVER GNUNET_YES
+#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
+
+#define LOG_STRERROR(kind,syscall) GNUNET_log_from_strerror (kind, "util", syscall)
+
+#define LOG_STRERROR_FILE(kind,syscall,filename) GNUNET_log_from_strerror_file (kind, "util", syscall, filename)
+
/**
* List of arrays of message handlers.
struct NotifyList
{
/**
- * This is a linked list.
+ * This is a doubly linked list.
*/
struct NotifyList *next;
+ /**
+ * This is a doubly linked list.
+ */
+ struct NotifyList *prev;
+
/**
* Function to call.
*/
struct GNUNET_SERVER_Handle
{
/**
- * My scheduler.
+ * List of handlers for incoming messages.
*/
- struct GNUNET_SCHEDULER_Handle *sched;
+ struct HandlerList *handlers;
/**
- * List of handlers for incoming messages.
+ * Head of list of our current clients.
*/
- struct HandlerList *handlers;
+ struct GNUNET_SERVER_Client *clients_head;
/**
- * List of our current clients.
+ * Head of list of our current clients.
*/
- struct GNUNET_SERVER_Client *clients;
+ struct GNUNET_SERVER_Client *clients_tail;
/**
- * Linked list of functions to call on disconnects by clients.
+ * Head of linked list of functions to call on disconnects by clients.
*/
- struct NotifyList *disconnect_notify_list;
+ struct NotifyList *disconnect_notify_list_head;
+
+ /**
+ * Tail of linked list of functions to call on disconnects by clients.
+ */
+ struct NotifyList *disconnect_notify_list_tail;
/**
* Function to call for access control.
struct GNUNET_TIME_Relative idle_timeout;
/**
- * maximum write buffer size for accepted sockets
+ * Task scheduled to do the listening.
*/
- size_t maxbuf;
+ GNUNET_SCHEDULER_TaskIdentifier listen_task;
/**
- * Task scheduled to do the listening.
+ * Alternative function to create a MST instance.
*/
- GNUNET_SCHEDULER_TaskIdentifier listen_task;
+ GNUNET_SERVER_MstCreateCallback mst_create;
+
+ /**
+ * Alternative function to destroy a MST instance.
+ */
+ GNUNET_SERVER_MstDestroyCallback mst_destroy;
+
+ /**
+ * Alternative function to give data to a MST instance.
+ */
+ GNUNET_SERVER_MstReceiveCallback mst_receive;
+
+ /**
+ * Closure for 'mst_'-callbacks.
+ */
+ void *mst_cls;
/**
* Do we ignore messages of types that we do not understand or do we
int require_found;
/**
- * Should all of the clients of this server continue to process
- * connections as usual even if we get a shutdown request? (the
- * listen socket always ignores shutdown).
+ * Set to GNUNET_YES once we are in 'soft' shutdown where we wait for
+ * all non-monitor clients to disconnect before we call
+ * GNUNET_SERVER_destroy. See 'test_monitor_clients'. Set to
+ * GNUNET_SYSERR once the final destroy task has been scheduled
+ * (we cannot run it in the same task).
*/
- int clients_ignore_shutdown;
+ int in_soft_shutdown;
+};
+
+
+/**
+ * Handle server returns for aborting transmission to a client.
+ */
+struct GNUNET_SERVER_TransmitHandle
+{
+ /**
+ * Function to call to get the message.
+ */
+ GNUNET_CONNECTION_TransmitReadyNotify callback;
+
+ /**
+ * Closure for 'callback'
+ */
+ void *callback_cls;
+
+ /**
+ * Active connection transmission handle.
+ */
+ struct GNUNET_CONNECTION_TransmitHandle *cth;
};
{
/**
- * This is a linked list.
+ * This is a doubly linked list.
*/
struct GNUNET_SERVER_Client *next;
+ /**
+ * This is a doubly linked list.
+ */
+ struct GNUNET_SERVER_Client *prev;
+
/**
* Processing of incoming data.
*/
- struct GNUNET_SERVER_MessageStreamTokenizer *mst;
+ void *mst;
/**
* Server that this client belongs to.
*/
GNUNET_SCHEDULER_TaskIdentifier restart_task;
+ /**
+ * Task that warns about missing calls to 'GNUNET_SERVER_receive_done'.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier warn_task;
+
+ /**
+ * Time when the warn task was started.
+ */
+ struct GNUNET_TIME_Absolute warn_start;
+
/**
* Last activity on this socket (used to time it out
* if reference_count == 0).
*/
struct GNUNET_TIME_Absolute last_activity;
+ /**
+ * Transmission handle we return for this client from
+ * GNUNET_SERVER_notify_transmit_ready.
+ */
+ struct GNUNET_SERVER_TransmitHandle th;
+
+ /**
+ * After how long should an idle connection time
+ * out (on write).
+ */
+ struct GNUNET_TIME_Relative idle_timeout;
+
/**
* Number of external entities with a reference to
* this client object.
int in_process_client_buffer;
/**
- * We're about to close down this client due to some serious
- * error.
+ * We're about to close down this client.
*/
int shutdown_now;
*/
int receive_pending;
+ /**
+ * Finish pending write when disconnecting?
+ */
+ int finish_pending_write;
+
/**
* Persist the file handle for this client no matter what happens,
* force the OS to close once the process actually dies. Should only
* be used in special cases!
*/
int persist;
+
+ /**
+ * Is this client a 'monitor' client that should not be counted
+ * when deciding on destroying the server during soft shutdown?
+ * (see also GNUNET_SERVICE_start)
+ */
+ int is_monitor;
+
+ /**
+ * Type of last message processed (for warn_no_receive_done).
+ */
+ uint16_t warn_type;
};
* @param tc reason why we are running right now
*/
static void
-process_listen_socket (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+process_listen_socket (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+
+/**
+ * Scheduler says our listen socket is ready. Process it!
+ *
+ * @param cls handle to our server for which we are processing the listen
+ * socket
+ * @param tc reason why we are running right now
+ */
+static void
+process_listen_socket (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct GNUNET_SERVER_Handle *server = cls;
struct GNUNET_CONNECTION_Handle *sock;
struct GNUNET_SERVER_Client *client;
- struct GNUNET_NETWORK_FDSet *r;
unsigned int i;
server->listen_task = GNUNET_SCHEDULER_NO_TASK;
- r = GNUNET_NETWORK_fdset_create ();
- i = 0;
- while (NULL != server->listen_sockets[i])
- GNUNET_NETWORK_fdset_set (r, server->listen_sockets[i++]);
if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- {
- /* ignore shutdown, someone else will take care of it! */
- server->listen_task = GNUNET_SCHEDULER_add_select (server->sched,
- GNUNET_SCHEDULER_PRIORITY_HIGH,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_FOREVER_REL,
- r, NULL,
- &process_listen_socket,
- server);
- GNUNET_NETWORK_fdset_destroy (r);
- return;
- }
+ {
+ /* ignore shutdown, someone else will take care of it! */
+ GNUNET_SERVER_resume (server);
+ return;
+ }
i = 0;
while (NULL != server->listen_sockets[i])
+ {
+ if (GNUNET_NETWORK_fdset_isset (tc->read_ready, server->listen_sockets[i]))
{
- if (GNUNET_NETWORK_fdset_isset
- (tc->read_ready, server->listen_sockets[i]))
- {
- sock =
- GNUNET_CONNECTION_create_from_accept (tc->sched, server->access,
- server->access_cls,
- server->listen_sockets[i],
- server->maxbuf);
- if (sock != NULL)
- {
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Server accepted incoming connection.\n");
-#endif
- client = GNUNET_SERVER_connect_socket (server, sock);
- GNUNET_CONNECTION_ignore_shutdown (sock,
- server->clients_ignore_shutdown);
- /* decrement reference count, we don't keep "client" alive */
- GNUNET_SERVER_client_drop (client);
- }
- }
- i++;
+ sock =
+ GNUNET_CONNECTION_create_from_accept (server->access,
+ server->access_cls,
+ server->listen_sockets[i]);
+ if (NULL != sock)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Server accepted incoming connection.\n");
+ client = GNUNET_SERVER_connect_socket (server, sock);
+ /* decrement reference count, we don't keep "client" alive */
+ GNUNET_SERVER_client_drop (client);
+ }
}
+ i++;
+ }
/* listen for more! */
- server->listen_task = GNUNET_SCHEDULER_add_select (server->sched,
- GNUNET_SCHEDULER_PRIORITY_HIGH,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_FOREVER_REL,
- r, NULL,
- &process_listen_socket,
- server);
- GNUNET_NETWORK_fdset_destroy (r);
+ GNUNET_SERVER_resume (server);
}
static struct GNUNET_NETWORK_Handle *
open_listen_socket (const struct sockaddr *serverAddr, socklen_t socklen)
{
- const static int on = 1;
struct GNUNET_NETWORK_Handle *sock;
uint16_t port;
int eno;
switch (serverAddr->sa_family)
- {
- case AF_INET:
- port = ntohs (((const struct sockaddr_in *) serverAddr)->sin_port);
- break;
- case AF_INET6:
- port = ntohs (((const struct sockaddr_in6 *) serverAddr)->sin6_port);
- break;
- default:
- port = 0;
- break;
- }
+ {
+ case AF_INET:
+ port = ntohs (((const struct sockaddr_in *) serverAddr)->sin_port);
+ break;
+ case AF_INET6:
+ port = ntohs (((const struct sockaddr_in6 *) serverAddr)->sin6_port);
+ break;
+ case AF_UNIX:
+ port = 0;
+ break;
+ default:
+ GNUNET_break (0);
+ port = 0;
+ break;
+ }
sock = GNUNET_NETWORK_socket_create (serverAddr->sa_family, SOCK_STREAM, 0);
if (NULL == sock)
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
- errno = 0;
- return NULL;
- }
- if (port != 0)
- {
- if (GNUNET_NETWORK_socket_setsockopt
- (sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)) != GNUNET_OK)
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
- "setsockopt");
-#ifdef IPV6_V6ONLY
- if ( (serverAddr->sa_family == AF_INET6) &&
- (GNUNET_NETWORK_socket_setsockopt
- (sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof (on)) != GNUNET_OK) )
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
- "setsockopt");
-#endif
- }
+ {
+ LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "socket");
+ errno = 0;
+ return NULL;
+ }
/* bind the socket */
- if (GNUNET_NETWORK_socket_bind (sock, serverAddr, socklen) != GNUNET_OK)
+ if (GNUNET_OK != GNUNET_NETWORK_socket_bind (sock, serverAddr, socklen))
+ {
+ eno = errno;
+ if (EADDRINUSE != errno)
{
- eno = errno;
- if (errno != EADDRINUSE)
- {
- /* we don't log 'EADDRINUSE' here since an IPv4 bind may
- fail if we already took the port on IPv6; if both IPv4 and
- IPv6 binds fail, then our caller will log using the
- errno preserved in 'eno' */
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
- if (port != 0)
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _
- ("`%s' failed for port %d (%s).\n"),
- "bind", port,
- (serverAddr->sa_family == AF_INET) ? "IPv4" : "IPv6");
- eno = 0;
- }
- GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
- errno = eno;
- return NULL;
+ /* we don't log 'EADDRINUSE' here since an IPv4 bind may
+ * fail if we already took the port on IPv6; if both IPv4 and
+ * IPv6 binds fail, then our caller will log using the
+ * errno preserved in 'eno' */
+ LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "bind");
+ if (0 != port)
+ LOG (GNUNET_ERROR_TYPE_ERROR, _("`%s' failed for port %d (%s).\n"),
+ "bind", port,
+ (AF_INET == serverAddr->sa_family) ? "IPv4" : "IPv6");
+ eno = 0;
}
- if (GNUNET_OK != GNUNET_NETWORK_socket_listen (sock, 5))
+ else
{
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
- GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
- errno = 0;
- return NULL;
+ if (0 != port)
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("`%s' failed for port %d (%s): address already in use\n"),
+ "bind", port,
+ (AF_INET == serverAddr->sa_family) ? "IPv4" : "IPv6");
+ else if (AF_UNIX == serverAddr->sa_family)
+ {
+ const struct sockaddr_un *un = (const struct sockaddr_un *) serverAddr;
+ unsigned int off = 0;
+
+ if ('\0' == un->sun_path[0])
+ off = 1; /* some UNIXPATHs start with 0 */
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("`%s' failed for `%.*s': address already in use\n"), "bind",
+ (int) ((sizeof (un->sun_path) - off)),
+ (&un->sun_path[off]));
+ }
}
-#if DEBUG_SERVER
- if (port != 0)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Server starts to listen on port %u.\n", port);
-#endif
+ GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
+ errno = eno;
+ return NULL;
+ }
+ if (GNUNET_OK != GNUNET_NETWORK_socket_listen (sock, 5))
+ {
+ LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "listen");
+ GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
+ errno = 0;
+ return NULL;
+ }
+ if (0 != port)
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Server starts to listen on port %u.\n",
+ port);
return sock;
}
/**
* Create a new server.
*
- * @param sched scheduler to use
+ * @param access function for access control
+ * @param access_cls closure for access
+ * @param lsocks NULL-terminated array of listen sockets
+ * @param idle_timeout after how long should we timeout idle connections?
+ * @param require_found if YES, connections sending messages of unknown type
+ * will be closed
+ * @return handle for the new server, NULL on error
+ * (typically, "port" already in use)
+ */
+struct GNUNET_SERVER_Handle *
+GNUNET_SERVER_create_with_sockets (GNUNET_CONNECTION_AccessCheck access,
+ void *access_cls,
+ struct GNUNET_NETWORK_Handle **lsocks,
+ struct GNUNET_TIME_Relative idle_timeout,
+ int require_found)
+{
+ struct GNUNET_SERVER_Handle *server;
+
+ server = GNUNET_malloc (sizeof (struct GNUNET_SERVER_Handle));
+ server->idle_timeout = idle_timeout;
+ server->listen_sockets = lsocks;
+ server->access = access;
+ server->access_cls = access_cls;
+ server->require_found = require_found;
+ if (NULL != lsocks)
+ GNUNET_SERVER_resume (server);
+ return server;
+}
+
+
+/**
+ * Create a new server.
+ *
* @param access function for access control
* @param access_cls closure for access
* @param serverAddr address to listen on (including port), NULL terminated array
* @param socklen length of serverAddr
- * @param maxbuf maximum write buffer size for accepted sockets
* @param idle_timeout after how long should we timeout idle connections?
* @param require_found if YES, connections sending messages of unknown type
* will be closed
* (typically, "port" already in use)
*/
struct GNUNET_SERVER_Handle *
-GNUNET_SERVER_create (struct GNUNET_SCHEDULER_Handle *sched,
- GNUNET_CONNECTION_AccessCheck access,
- void *access_cls,
+GNUNET_SERVER_create (GNUNET_CONNECTION_AccessCheck access, void *access_cls,
struct sockaddr *const *serverAddr,
const socklen_t * socklen,
- size_t maxbuf,
- struct GNUNET_TIME_Relative
- idle_timeout, int require_found)
+ struct GNUNET_TIME_Relative idle_timeout,
+ int require_found)
{
- struct GNUNET_SERVER_Handle *ret;
struct GNUNET_NETWORK_Handle **lsocks;
- struct GNUNET_NETWORK_FDSet *r;
unsigned int i;
unsigned int j;
+ unsigned int k;
+ int seen;
i = 0;
- while (serverAddr[i] != NULL)
+ while (NULL != serverAddr[i])
i++;
if (i > 0)
+ {
+ lsocks = GNUNET_malloc (sizeof (struct GNUNET_NETWORK_Handle *) * (i + 1));
+ i = 0;
+ j = 0;
+ while (NULL != serverAddr[i])
{
- lsocks =
- GNUNET_malloc (sizeof (struct GNUNET_NETWORK_Handle *) * (i + 1));
- i = 0;
- j = 0;
- while (serverAddr[i] != NULL)
- {
- lsocks[j] = open_listen_socket (serverAddr[i], socklen[i]);
- if (lsocks[j] != NULL)
- j++;
- i++;
- }
- if (j == 0)
- {
- if (errno != 0)
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
- GNUNET_free (lsocks);
- lsocks = NULL;
- }
+ seen = 0;
+ for (k=0;k<i;k++)
+ if ( (socklen[k] == socklen[i]) &&
+ (0 == memcmp (serverAddr[k], serverAddr[i], socklen[i])) )
+ {
+ seen = 1;
+ break;
+ }
+ if (0 != seen)
+ {
+ /* duplicate address, skip */
+ i++;
+ continue;
+ }
+ lsocks[j] = open_listen_socket (serverAddr[i], socklen[i]);
+ if (NULL != lsocks[j])
+ j++;
+ i++;
}
- else
+ if (0 == j)
{
+ if (0 != errno)
+ LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "bind");
+ GNUNET_free (lsocks);
lsocks = NULL;
}
- ret = GNUNET_malloc (sizeof (struct GNUNET_SERVER_Handle));
- ret->sched = sched;
- ret->maxbuf = maxbuf;
- ret->idle_timeout = idle_timeout;
- ret->listen_sockets = lsocks;
- ret->access = access;
- ret->access_cls = access_cls;
- ret->require_found = require_found;
- if (lsocks != NULL)
- {
- r = GNUNET_NETWORK_fdset_create ();
- i = 0;
- while (NULL != ret->listen_sockets[i])
- GNUNET_NETWORK_fdset_set (r, ret->listen_sockets[i++]);
- ret->listen_task = GNUNET_SCHEDULER_add_select (sched,
- GNUNET_SCHEDULER_PRIORITY_HIGH,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_FOREVER_REL,
- r, NULL,
- &process_listen_socket,
- ret);
- GNUNET_NETWORK_fdset_destroy (r);
- }
- return ret;
+ }
+ else
+ {
+ lsocks = NULL;
+ }
+ return GNUNET_SERVER_create_with_sockets (access, access_cls, lsocks,
+ idle_timeout, require_found);
+}
+
+
+/**
+ * Set the 'monitor' flag on this client. Clients which have been
+ * marked as 'monitors' won't prevent the server from shutting down
+ * once 'GNUNET_SERVER_stop_listening' has been invoked. The idea is
+ * that for "normal" clients we likely want to allow them to process
+ * their requests; however, monitor-clients are likely to 'never'
+ * disconnect during shutdown and thus will not be considered when
+ * determining if the server should continue to exist after
+ * 'GNUNET_SERVER_destroy' has been called.
+ *
+ * @param client the client to set the 'monitor' flag on
+ */
+void
+GNUNET_SERVER_client_mark_monitor (struct GNUNET_SERVER_Client *client)
+{
+ client->is_monitor = GNUNET_YES;
+}
+
+
+/**
+ * Helper function for 'test_monitor_clients' to trigger
+ * 'GNUNET_SERVER_destroy' after the stack has unwound.
+ *
+ * @param cls the 'struct GNUNET_SERVER_Handle' to destroy
+ * @param tc unused
+ */
+static void
+do_destroy (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_SERVER_Handle *server = cls;
+ GNUNET_SERVER_destroy (server);
+}
+
+
+/**
+ * Check if only 'monitor' clients are left. If so, destroy the
+ * server completely.
+ *
+ * @param server server to test for full shutdown
+ */
+static void
+test_monitor_clients (struct GNUNET_SERVER_Handle *server)
+{
+ struct GNUNET_SERVER_Client *client;
+
+ if (GNUNET_YES != server->in_soft_shutdown)
+ return;
+ for (client = server->clients_head; NULL != client; client = client->next)
+ if (GNUNET_NO == client->is_monitor)
+ return; /* not done yet */
+ server->in_soft_shutdown = GNUNET_SYSERR;
+ GNUNET_SCHEDULER_add_continuation (&do_destroy, server,
+ GNUNET_SCHEDULER_REASON_PREREQ_DONE);
+}
+
+
+/**
+ * Suspend accepting connections from the listen socket temporarily.
+ *
+ * @param server server to stop accepting connections.
+ */
+void
+GNUNET_SERVER_suspend (struct GNUNET_SERVER_Handle *server)
+{
+ if (GNUNET_SCHEDULER_NO_TASK != server->listen_task)
+ {
+ GNUNET_SCHEDULER_cancel (server->listen_task);
+ server->listen_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+}
+
+
+/**
+ * Resume accepting connections from the listen socket.
+ *
+ * @param server server to stop accepting connections.
+ */
+void
+GNUNET_SERVER_resume (struct GNUNET_SERVER_Handle *server)
+{
+ struct GNUNET_NETWORK_FDSet *r;
+ unsigned int i;
+
+ if (NULL == server->listen_sockets)
+ return;
+ if (NULL == server->listen_sockets[0])
+ return; /* nothing to do, no listen sockets! */
+ if (NULL == server->listen_sockets[1])
+ {
+ /* simplified method: no fd set needed; this is then much simpler and
+ much more efficient */
+ server->listen_task =
+ GNUNET_SCHEDULER_add_read_net_with_priority (GNUNET_TIME_UNIT_FOREVER_REL,
+ GNUNET_SCHEDULER_PRIORITY_HIGH,
+ server->listen_sockets[0],
+ &process_listen_socket, server);
+ return;
+ }
+ r = GNUNET_NETWORK_fdset_create ();
+ i = 0;
+ while (NULL != server->listen_sockets[i])
+ GNUNET_NETWORK_fdset_set (r, server->listen_sockets[i++]);
+ server->listen_task =
+ GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_HIGH,
+ GNUNET_TIME_UNIT_FOREVER_REL, r, NULL,
+ &process_listen_socket, server);
+ GNUNET_NETWORK_fdset_destroy (r);
+}
+
+
+/**
+ * Stop the listen socket and get ready to shutdown the server
+ * once only 'monitor' clients are left.
+ *
+ * @param server server to stop listening on
+ */
+void
+GNUNET_SERVER_stop_listening (struct GNUNET_SERVER_Handle *server)
+{
+ unsigned int i;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Server in soft shutdown\n");
+ if (GNUNET_SCHEDULER_NO_TASK != server->listen_task)
+ {
+ GNUNET_SCHEDULER_cancel (server->listen_task);
+ server->listen_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (NULL != server->listen_sockets)
+ {
+ i = 0;
+ while (NULL != server->listen_sockets[i])
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_NETWORK_socket_close (server->listen_sockets[i++]));
+ GNUNET_free (server->listen_sockets);
+ server->listen_sockets = NULL;
+ }
+ if (GNUNET_NO == server->in_soft_shutdown)
+ server->in_soft_shutdown = GNUNET_YES;
+ test_monitor_clients (server);
}
/**
* Free resources held by this server.
*
- * @param s server to destroy
+ * @param server server to destroy
*/
void
-GNUNET_SERVER_destroy (struct GNUNET_SERVER_Handle *s)
+GNUNET_SERVER_destroy (struct GNUNET_SERVER_Handle *server)
{
struct HandlerList *hpos;
struct NotifyList *npos;
unsigned int i;
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Server shutting down.\n");
-#endif
- if (GNUNET_SCHEDULER_NO_TASK != s->listen_task)
- {
- GNUNET_SCHEDULER_cancel (s->sched, s->listen_task);
- s->listen_task = GNUNET_SCHEDULER_NO_TASK;
- }
- if (s->listen_sockets != NULL)
- {
- i = 0;
- while (s->listen_sockets[i] != NULL)
- GNUNET_break (GNUNET_OK ==
- GNUNET_NETWORK_socket_close (s->listen_sockets[i++]));
- GNUNET_free (s->listen_sockets);
- s->listen_sockets = NULL;
- }
- while (s->clients != NULL)
- GNUNET_SERVER_client_disconnect (s->clients);
- while (NULL != (hpos = s->handlers))
- {
- s->handlers = hpos->next;
- GNUNET_free (hpos);
- }
- while (NULL != (npos = s->disconnect_notify_list))
- {
- npos->callback (npos->callback_cls, NULL);
- s->disconnect_notify_list = npos->next;
- GNUNET_free (npos);
- }
- GNUNET_free (s);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Server shutting down.\n");
+ if (GNUNET_SCHEDULER_NO_TASK != server->listen_task)
+ {
+ GNUNET_SCHEDULER_cancel (server->listen_task);
+ server->listen_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (NULL != server->listen_sockets)
+ {
+ i = 0;
+ while (NULL != server->listen_sockets[i])
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_NETWORK_socket_close (server->listen_sockets[i++]));
+ GNUNET_free (server->listen_sockets);
+ server->listen_sockets = NULL;
+ }
+ while (NULL != server->clients_head)
+ GNUNET_SERVER_client_disconnect (server->clients_head);
+ while (NULL != (hpos = server->handlers))
+ {
+ server->handlers = hpos->next;
+ GNUNET_free (hpos);
+ }
+ while (NULL != (npos = server->disconnect_notify_list_head))
+ {
+ npos->callback (npos->callback_cls, NULL);
+ GNUNET_CONTAINER_DLL_remove (server->disconnect_notify_list_head,
+ server->disconnect_notify_list_tail,
+ npos);
+ GNUNET_free (npos);
+ }
+ GNUNET_free (server);
}
*/
void
GNUNET_SERVER_add_handlers (struct GNUNET_SERVER_Handle *server,
- const struct GNUNET_SERVER_MessageHandler
- *handlers)
+ const struct GNUNET_SERVER_MessageHandler *handlers)
{
struct HandlerList *p;
}
+/**
+ * Change functions used by the server to tokenize the message stream.
+ * (very rarely used).
+ *
+ * @param server server to modify
+ * @param create new tokenizer initialization function
+ * @param destroy new tokenizer destruction function
+ * @param receive new tokenizer receive function
+ * @param cls closure for 'create', 'receive', 'destroy'
+ */
+void
+GNUNET_SERVER_set_callbacks (struct GNUNET_SERVER_Handle *server,
+ GNUNET_SERVER_MstCreateCallback create,
+ GNUNET_SERVER_MstDestroyCallback destroy,
+ GNUNET_SERVER_MstReceiveCallback receive,
+ void *cls)
+{
+ server->mst_create = create;
+ server->mst_destroy = destroy;
+ server->mst_receive = receive;
+ server->mst_cls = cls;
+}
+
+
+/**
+ * Task run to warn about missing calls to 'GNUNET_SERVER_receive_done'.
+ *
+ * @param cls our 'struct GNUNET_SERVER_Client*' to process more requests from
+ * @param tc scheduler context (unused)
+ */
+static void
+warn_no_receive_done (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_SERVER_Client *client = cls;
+
+ GNUNET_break (0 != client->warn_type); /* type should never be 0 here, as we don't use 0 */
+ client->warn_task =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
+ &warn_no_receive_done, client);
+ if (0 == (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _
+ ("Processing code for message of type %u did not call GNUNET_SERVER_receive_done after %llums\n"),
+ (unsigned int) client->warn_type,
+ (unsigned long long)
+ GNUNET_TIME_absolute_get_duration (client->warn_start).rel_value);
+}
+
+
+/**
+ * Disable the warning the server issues if a message is not acknowledged
+ * in a timely fashion. Use this call if a client is intentionally delayed
+ * for a while. Only applies to the current message.
+ *
+ * @param client client for which to disable the warning
+ */
+void
+GNUNET_SERVER_disable_receive_done_warning (struct GNUNET_SERVER_Client *client)
+{
+ if (GNUNET_SCHEDULER_NO_TASK != client->warn_task)
+ {
+ GNUNET_SCHEDULER_cancel (client->warn_task);
+ client->warn_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+}
+
+
/**
* Inject a message into the server, pretend it came
* from the specified client. Delivery of the message
type = ntohs (message->type);
size = ntohs (message->size);
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Server schedules transmission of %u-byte message of type %u to client.\n",
- size, type);
-#endif
- pos = server->handlers;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Server schedules transmission of %u-byte message of type %u to client.\n",
+ size, type);
found = GNUNET_NO;
- while (pos != NULL)
+ for (pos = server->handlers; NULL != pos; pos = pos->next)
+ {
+ i = 0;
+ while (pos->handlers[i].callback != NULL)
{
- i = 0;
- while (pos->handlers[i].callback != NULL)
+ mh = &pos->handlers[i];
+ if ((mh->type == type) || (mh->type == GNUNET_MESSAGE_TYPE_ALL))
+ {
+ if ((0 != mh->expected_size) && (mh->expected_size != size))
{
- mh = &pos->handlers[i];
- if ( (mh->type == type) ||
- (mh->type == GNUNET_MESSAGE_TYPE_ALL) )
- {
- if ((mh->expected_size != 0) && (mh->expected_size != size))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (sender != NULL)
- sender->suspended++;
- mh->callback (mh->callback_cls, sender, message);
- found = GNUNET_YES;
- }
- i++;
+#if GNUNET8_NETWORK_IS_DEAD
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "Expected %u bytes for message of type %u, got %u\n",
+ mh->expected_size, mh->type, size);
+ GNUNET_break_op (0);
+#endif
+ return GNUNET_SYSERR;
}
- pos = pos->next;
- }
- if (found == GNUNET_NO)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
- "Received message of unknown type %d\n",
- type);
- if (server->require_found == GNUNET_YES)
- return GNUNET_SYSERR;
+ if (NULL != sender)
+ {
+ if ( (0 == sender->suspended) &&
+ (GNUNET_SCHEDULER_NO_TASK == sender->warn_task) )
+ {
+ GNUNET_break (0 != type); /* type should never be 0 here, as we don't use 0 */
+ sender->warn_start = GNUNET_TIME_absolute_get ();
+ sender->warn_task =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
+ &warn_no_receive_done, sender);
+ sender->warn_type = type;
+ }
+ sender->suspended++;
+ }
+ mh->callback (mh->callback_cls, sender, message);
+ found = GNUNET_YES;
+ }
+ i++;
}
+ }
+ if (GNUNET_NO == found)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
+ "Received message of unknown type %d\n", type);
+ if (GNUNET_YES == server->require_found)
+ return GNUNET_SYSERR;
+ }
return GNUNET_OK;
}
* @param errCode code indicating errors receiving, 0 for success
*/
static void
-process_incoming (void *cls,
- const void *buf,
- size_t available,
- const struct sockaddr *addr,
- socklen_t addrlen, int errCode);
+process_incoming (void *cls, const void *buf, size_t available,
+ const struct sockaddr *addr, socklen_t addrlen, int errCode);
/**
* Process messages from the client's message tokenizer until either
- * the tokenizer is empty (and then schedule receiving more), or
+ * the tokenizer is empty (and then schedule receiving more), or
* until some handler is not immediately done (then wait for restart_processing)
* or shutdown.
*
* GNUNET_SYSERR if we should instantly abort due to error in a previous step
*/
static void
-process_mst (struct GNUNET_SERVER_Client *client,
- int ret)
+process_mst (struct GNUNET_SERVER_Client *client, int ret)
{
- while ( (ret != GNUNET_SYSERR) &&
- (client->server != NULL) &&
- (GNUNET_YES != client->shutdown_now) &&
- (0 == client->suspended) )
+ while ((GNUNET_SYSERR != ret) && (NULL != client->server) &&
+ (GNUNET_YES != client->shutdown_now) && (0 == client->suspended))
+ {
+ if (GNUNET_OK == ret)
{
- if (ret == GNUNET_OK)
- {
- client->receive_pending = GNUNET_YES;
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Server re-enters receive loop.\n");
-#endif
- GNUNET_CONNECTION_receive (client->connection,
- GNUNET_SERVER_MAX_MESSAGE_SIZE,
- client->server->idle_timeout,
- &process_incoming, client);
- break;
- }
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Server processes additional messages instantly.\n");
-#endif
- ret = GNUNET_SERVER_mst_receive (client->mst, client, NULL, 0, GNUNET_NO, GNUNET_YES);
- }
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Server leaves instant processing loop: ret = %d, server = %p, shutdown = %d, suspended = %u\n",
- ret,
- client->server,
- client->shutdown_now,
- client->suspended);
-#endif
-
- if (ret == GNUNET_NO)
- {
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Server has more data pending but is suspended.\n");
-#endif
- client->receive_pending = GNUNET_SYSERR; /* data pending */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Server re-enters receive loop, timeout: %llu.\n",
+ client->idle_timeout.rel_value);
+ client->receive_pending = GNUNET_YES;
+ GNUNET_CONNECTION_receive (client->connection,
+ GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
+ client->idle_timeout, &process_incoming,
+ client);
+ break;
}
- if ( (ret == GNUNET_SYSERR) ||
- (GNUNET_YES == client->shutdown_now) )
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Server processes additional messages instantly.\n");
+ if (NULL != client->server->mst_receive)
+ ret =
+ client->server->mst_receive (client->server->mst_cls, client->mst,
+ client, NULL, 0, GNUNET_NO, GNUNET_YES);
+ else
+ ret =
+ GNUNET_SERVER_mst_receive (client->mst, client, NULL, 0, GNUNET_NO,
+ GNUNET_YES);
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Server leaves instant processing loop: ret = %d, server = %p, shutdown = %d, suspended = %u\n",
+ ret, client->server, client->shutdown_now, client->suspended);
+ if (GNUNET_NO == ret)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Server has more data pending but is suspended.\n");
+ client->receive_pending = GNUNET_SYSERR; /* data pending */
+ }
+ if ((GNUNET_SYSERR == ret) || (GNUNET_YES == client->shutdown_now))
GNUNET_SERVER_client_disconnect (client);
- GNUNET_SERVER_client_drop (client);
}
* @param errCode code indicating errors receiving, 0 for success
*/
static void
-process_incoming (void *cls,
- const void *buf,
- size_t available,
- const struct sockaddr *addr,
- socklen_t addrlen, int errCode)
+process_incoming (void *cls, const void *buf, size_t available,
+ const struct sockaddr *addr, socklen_t addrlen, int errCode)
{
struct GNUNET_SERVER_Client *client = cls;
struct GNUNET_SERVER_Handle *server = client->server;
+ struct GNUNET_TIME_Absolute end;
+ struct GNUNET_TIME_Absolute now;
int ret;
- GNUNET_assert (client->receive_pending == GNUNET_YES);
+ GNUNET_assert (GNUNET_YES == client->receive_pending);
client->receive_pending = GNUNET_NO;
- if ((buf == NULL) ||
- (available == 0) ||
- (errCode != 0) ||
- (server == NULL) ||
- (client->shutdown_now == GNUNET_YES) ||
+ now = GNUNET_TIME_absolute_get ();
+ end = GNUNET_TIME_absolute_add (client->last_activity, client->idle_timeout);
+
+ if ((NULL == buf) && (0 == available) && (NULL == addr) && (0 == errCode) &&
+ (GNUNET_YES != client->shutdown_now) && (NULL != server) &&
+ (GNUNET_YES == GNUNET_CONNECTION_check (client->connection)) &&
+ (end.abs_value > now.abs_value))
+ {
+ /* wait longer, timeout changed (i.e. due to us sending) */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Receive time out, but no disconnect due to sending (%p)\n",
+ GNUNET_a2s (addr, addrlen));
+ client->receive_pending = GNUNET_YES;
+ GNUNET_CONNECTION_receive (client->connection,
+ GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
+ GNUNET_TIME_absolute_get_remaining (end),
+ &process_incoming, client);
+ return;
+ }
+ if ((NULL == buf) || (0 == available) || (0 != errCode) || (NULL == server) ||
+ (GNUNET_YES == client->shutdown_now) ||
(GNUNET_YES != GNUNET_CONNECTION_check (client->connection)))
- {
- /* other side closed connection, error connecting, etc. */
- GNUNET_SERVER_client_disconnect (client);
- return;
- }
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Server receives %u bytes from `%s'.\n",
- (unsigned int) available,
- GNUNET_a2s (addr, addrlen));
-#endif
+ {
+ /* other side closed connection, error connecting, etc. */
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Server receives %u bytes from `%s'.\n",
+ (unsigned int) available, GNUNET_a2s (addr, addrlen));
GNUNET_SERVER_client_keep (client);
- client->last_activity = GNUNET_TIME_absolute_get ();
- ret = GNUNET_SERVER_mst_receive (client->mst, client, buf, available, GNUNET_NO, GNUNET_YES);
+ client->last_activity = now;
+
+ if (NULL != server->mst_receive)
+ ret =
+ client->server->mst_receive (client->server->mst_cls, client->mst,
+ client, buf, available, GNUNET_NO, GNUNET_YES);
+ else if (NULL != client->mst)
+ {
+ ret =
+ GNUNET_SERVER_mst_receive (client->mst, client, buf, available, GNUNET_NO,
+ GNUNET_YES);
+ }
+ else
+ {
+ GNUNET_break (0);
+ return;
+ }
+
process_mst (client, ret);
+ GNUNET_SERVER_client_drop (client);
}
* @param tc scheduler context (unused)
*/
static void
-restart_processing (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+restart_processing (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct GNUNET_SERVER_Client *client = cls;
- struct GNUNET_SERVER_Handle *server = client->server;
+ GNUNET_assert (GNUNET_YES != client->shutdown_now);
client->restart_task = GNUNET_SCHEDULER_NO_TASK;
- if ( (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) &&
- (GNUNET_NO == server->clients_ignore_shutdown) )
- {
- GNUNET_SERVER_client_disconnect (client);
- return;
- }
- if (client->receive_pending == GNUNET_NO)
- {
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Server begins to read again from client.\n");
-#endif
- client->receive_pending = GNUNET_YES;
- GNUNET_CONNECTION_receive (client->connection,
- GNUNET_SERVER_MAX_MESSAGE_SIZE,
- client->server->idle_timeout, &process_incoming, client);
- return;
- }
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Server continues processing messages still in the buffer.\n");
-#endif
+ if (GNUNET_NO == client->receive_pending)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Server begins to read again from client.\n");
+ client->receive_pending = GNUNET_YES;
+ GNUNET_CONNECTION_receive (client->connection,
+ GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
+ client->idle_timeout, &process_incoming, client);
+ return;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Server continues processing messages still in the buffer.\n");
GNUNET_SERVER_client_keep (client);
client->receive_pending = GNUNET_NO;
process_mst (client, GNUNET_NO);
+ GNUNET_SERVER_client_drop (client);
}
* @param cls closure (struct GNUNET_SERVER_Handle)
* @param client identification of the client (struct GNUNET_SERVER_Client*)
* @param message the actual message
+ *
+ * @return GNUNET_OK on success, GNUNET_SYSERR to stop further processing
*/
-static void
-client_message_tokenizer_callback (void *cls,
- void *client,
- const struct GNUNET_MessageHeader *message)
+static int
+client_message_tokenizer_callback (void *cls, void *client,
+ const struct GNUNET_MessageHeader *message)
{
struct GNUNET_SERVER_Handle *server = cls;
struct GNUNET_SERVER_Client *sender = client;
int ret;
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Tokenizer gives server message of type %u from client\n",
- ntohs (message->type));
-#endif
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Tokenizer gives server message of type %u from client\n",
+ ntohs (message->type));
sender->in_process_client_buffer = GNUNET_YES;
ret = GNUNET_SERVER_inject (server, sender, message);
sender->in_process_client_buffer = GNUNET_NO;
- if (GNUNET_OK != ret)
- GNUNET_SERVER_client_disconnect (sender);
+ if ( (GNUNET_OK != ret) || (GNUNET_YES == sender->shutdown_now) )
+ {
+ GNUNET_SERVER_client_disconnect (sender);
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
}
* "client_drop" on the return value eventually)
*/
struct GNUNET_SERVER_Client *
-GNUNET_SERVER_connect_socket (struct
- GNUNET_SERVER_Handle
- *server,
+GNUNET_SERVER_connect_socket (struct GNUNET_SERVER_Handle *server,
struct GNUNET_CONNECTION_Handle *connection)
{
struct GNUNET_SERVER_Client *client;
client = GNUNET_malloc (sizeof (struct GNUNET_SERVER_Client));
client->connection = connection;
- client->mst = GNUNET_SERVER_mst_create (GNUNET_SERVER_MAX_MESSAGE_SIZE,
- &client_message_tokenizer_callback,
- server);
client->reference_count = 1;
client->server = server;
client->last_activity = GNUNET_TIME_absolute_get ();
- client->next = server->clients;
- server->clients = client;
+ client->idle_timeout = server->idle_timeout;
+ GNUNET_CONTAINER_DLL_insert (server->clients_head,
+ server->clients_tail,
+ client);
+ if (NULL != server->mst_create)
+ client->mst =
+ server->mst_create (server->mst_cls, client);
+ else
+ client->mst =
+ GNUNET_SERVER_mst_create (&client_message_tokenizer_callback, server);
+ GNUNET_assert (NULL != client->mst);
client->receive_pending = GNUNET_YES;
GNUNET_CONNECTION_receive (client->connection,
- GNUNET_SERVER_MAX_MESSAGE_SIZE,
- server->idle_timeout, &process_incoming, client);
+ GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
+ client->idle_timeout, &process_incoming, client);
return client;
}
+/**
+ * Change the timeout for a particular client. Decreasing the timeout
+ * may not go into effect immediately (only after the previous timeout
+ * times out or activity happens on the socket).
+ *
+ * @param client the client to update
+ * @param timeout new timeout for activities on the socket
+ */
+void
+GNUNET_SERVER_client_set_timeout (struct GNUNET_SERVER_Client *client,
+ struct GNUNET_TIME_Relative timeout)
+{
+ client->idle_timeout = timeout;
+}
+
+
/**
* Notify the server that the given client handle should
* be kept (keeps the connection up if possible, increments
{
GNUNET_assert (client->reference_count > 0);
client->reference_count--;
- if ( (client->shutdown_now == GNUNET_YES) &&
- (client->reference_count == 0) )
+ if ((GNUNET_YES == client->shutdown_now) && (0 == client->reference_count))
GNUNET_SERVER_client_disconnect (client);
}
GNUNET_SERVER_client_get_address (struct GNUNET_SERVER_Client *client,
void **addr, size_t * addrlen)
{
- return GNUNET_CONNECTION_get_address (client->connection,
- addr, addrlen);
+ return GNUNET_CONNECTION_get_address (client->connection, addr, addrlen);
}
n = GNUNET_malloc (sizeof (struct NotifyList));
n->callback = callback;
n->callback_cls = callback_cls;
- n->next = server->disconnect_notify_list;
- server->disconnect_notify_list = n;
+ GNUNET_CONTAINER_DLL_insert (server->disconnect_notify_list_head,
+ server->disconnect_notify_list_tail,
+ n);
}
*/
void
GNUNET_SERVER_disconnect_notify_cancel (struct GNUNET_SERVER_Handle *server,
- GNUNET_SERVER_DisconnectCallback callback,
- void *callback_cls)
+ GNUNET_SERVER_DisconnectCallback
+ callback, void *callback_cls)
{
struct NotifyList *pos;
- struct NotifyList *prev;
- prev = NULL;
- pos = server->disconnect_notify_list;
- while (pos != NULL)
- {
- if ( (pos->callback == callback) &&
- (pos->callback_cls == callback_cls ) )
- break;
- prev = pos;
- pos = pos->next;
- }
- if (pos == NULL)
- {
- GNUNET_break (0);
- return;
- }
- if (prev == NULL)
- server->disconnect_notify_list = pos->next;
- else
- prev->next = pos->next;
+ for (pos = server->disconnect_notify_list_head; NULL != pos; pos = pos->next)
+ if ((pos->callback == callback) && (pos->callback_cls == callback_cls))
+ break;
+ if (NULL == pos)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ GNUNET_CONTAINER_DLL_remove (server->disconnect_notify_list_head,
+ server->disconnect_notify_list_tail,
+ pos);
GNUNET_free (pos);
}
+/**
+ * Destroy the connection that is passed in via 'cls'. Used
+ * as calling 'GNUNET_CONNECTION_destroy' from within a function
+ * that was itself called from within 'process_notify' of
+ * 'connection.c' is not allowed (see #2329).
+ *
+ * @param cls connection to destroy
+ * @param tc scheduler context (unused)
+ */
+static void
+destroy_connection (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_CONNECTION_Handle *connection = cls;
+
+ GNUNET_CONNECTION_destroy (connection);
+}
+
+
/**
* Ask the server to disconnect from the given client.
* This is the same as returning GNUNET_SYSERR from a message
void
GNUNET_SERVER_client_disconnect (struct GNUNET_SERVER_Client *client)
{
- struct GNUNET_SERVER_Client *prev;
- struct GNUNET_SERVER_Client *pos;
- struct GNUNET_SERVER_Handle *server;
+ struct GNUNET_SERVER_Handle *server = client->server;
struct NotifyList *n;
- unsigned int rc;
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Client is being disconnected from the server.\n");
-#endif
- if (client->restart_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (client->server->sched,
- client->restart_task);
- client->restart_task = GNUNET_SCHEDULER_NO_TASK;
- }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Client is being disconnected from the server.\n");
+ if (GNUNET_SCHEDULER_NO_TASK != client->restart_task)
+ {
+ GNUNET_SCHEDULER_cancel (client->restart_task);
+ client->restart_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != client->warn_task)
+ {
+ GNUNET_SCHEDULER_cancel (client->warn_task);
+ client->warn_task = GNUNET_SCHEDULER_NO_TASK;
+ }
if (GNUNET_YES == client->receive_pending)
- {
- GNUNET_CONNECTION_receive_cancel (client->connection);
- client->receive_pending = GNUNET_NO;
- }
+ {
+ GNUNET_CONNECTION_receive_cancel (client->connection);
+ client->receive_pending = GNUNET_NO;
+ }
+ client->shutdown_now = GNUNET_YES;
+ client->reference_count++; /* make sure nobody else clean up client... */
+ if ( (NULL != client->mst) &&
+ (NULL != server) )
+ {
+ GNUNET_CONTAINER_DLL_remove (server->clients_head,
+ server->clients_tail,
+ client);
+ if (NULL != server->mst_destroy)
+ server->mst_destroy (server->mst_cls, client->mst);
+ else
+ GNUNET_SERVER_mst_destroy (client->mst);
+ client->mst = NULL;
+ for (n = server->disconnect_notify_list_head; NULL != n; n = n->next)
+ n->callback (n->callback_cls, client);
+ }
+ client->reference_count--;
+ if (client->reference_count > 0)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "RC still positive, not destroying everything.\n");
+ client->server = NULL;
+ return;
+ }
+ if (GNUNET_YES == client->in_process_client_buffer)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Still processing inputs, not destroying everything.\n");
+ return;
+ }
+ if (GNUNET_YES == client->persist)
+ GNUNET_CONNECTION_persist_ (client->connection);
+ if (NULL != client->th.cth)
+ GNUNET_SERVER_notify_transmit_ready_cancel (&client->th);
+ (void) GNUNET_SCHEDULER_add_now (&destroy_connection,
+ client->connection);
+ /* need to cancel again, as it might have been re-added
+ in the meantime (i.e. during callbacks) */
+ if (GNUNET_SCHEDULER_NO_TASK != client->warn_task)
+ {
+ GNUNET_SCHEDULER_cancel (client->warn_task);
+ client->warn_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (GNUNET_YES == client->receive_pending)
+ {
+ GNUNET_CONNECTION_receive_cancel (client->connection);
+ client->receive_pending = GNUNET_NO;
+ }
+ GNUNET_free (client);
+ /* we might be in soft-shutdown, test if we're done */
+ if (NULL != server)
+ test_monitor_clients (server);
+}
- rc = client->reference_count;
- if (client->server != NULL)
- {
- server = client->server;
- client->server = NULL;
- client->shutdown_now = GNUNET_YES;
- prev = NULL;
- pos = server->clients;
- while ((pos != NULL) && (pos != client))
- {
- prev = pos;
- pos = pos->next;
- }
- GNUNET_assert (pos != NULL);
- if (prev == NULL)
- server->clients = pos->next;
- else
- prev->next = pos->next;
- if (client->restart_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (server->sched,
- client->restart_task);
- client->restart_task = GNUNET_SCHEDULER_NO_TASK;
- }
- n = server->disconnect_notify_list;
- while (n != NULL)
- {
- n->callback (n->callback_cls, client);
- n = n->next;
- }
- }
- if (rc > 0)
- {
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "RC still positive, not destroying everything.\n");
-#endif
- return;
- }
- if (client->in_process_client_buffer == GNUNET_YES)
- {
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Still processing inputs, not destroying everything.\n");
-#endif
- return;
- }
- if (client->persist == GNUNET_YES)
- GNUNET_CONNECTION_persist_ (client->connection);
- GNUNET_CONNECTION_destroy (client->connection, GNUNET_NO);
- GNUNET_SERVER_mst_destroy (client->mst);
- GNUNET_free (client);
+/**
+ * Disable the "CORK" feature for communication with the given client,
+ * forcing the OS to immediately flush the buffer on transmission
+ * instead of potentially buffering multiple messages.
+ *
+ * @param client handle to the client
+ * @return GNUNET_OK on success
+ */
+int
+GNUNET_SERVER_client_disable_corking (struct GNUNET_SERVER_Client *client)
+{
+ return GNUNET_CONNECTION_disable_corking (client->connection);
+}
+
+
+/**
+ * Wrapper for transmission notification that calls the original
+ * callback and update the last activity time for our connection.
+ *
+ * @param cls the 'struct GNUNET_SERVER_Client'
+ * @param size number of bytes we can transmit
+ * @param buf where to copy the message
+ * @return number of bytes actually transmitted
+ */
+static size_t
+transmit_ready_callback_wrapper (void *cls, size_t size, void *buf)
+{
+ struct GNUNET_SERVER_Client *client = cls;
+ GNUNET_CONNECTION_TransmitReadyNotify callback;
+
+ client->th.cth = NULL;
+ callback = client->th.callback;
+ client->th.callback = NULL;
+ client->last_activity = GNUNET_TIME_absolute_get ();
+ return callback (client->th.callback_cls, size, buf);
}
* @param callback_cls closure for callback
* @return non-NULL if the notify callback was queued; can be used
* to cancel the request using
- * GNUNET_CONNECTION_notify_transmit_ready_cancel.
+ * GNUNET_SERVER_notify_transmit_ready_cancel.
* NULL if we are already going to notify someone else (busy)
*/
-struct GNUNET_CONNECTION_TransmitHandle *
+struct GNUNET_SERVER_TransmitHandle *
GNUNET_SERVER_notify_transmit_ready (struct GNUNET_SERVER_Client *client,
size_t size,
struct GNUNET_TIME_Relative timeout,
GNUNET_CONNECTION_TransmitReadyNotify
callback, void *callback_cls)
{
- return GNUNET_CONNECTION_notify_transmit_ready (client->connection,
- size,
- timeout, callback, callback_cls);
+ if (NULL != client->th.callback)
+ return NULL;
+ client->th.callback_cls = callback_cls;
+ client->th.callback = callback;
+ client->th.cth = GNUNET_CONNECTION_notify_transmit_ready (client->connection, size,
+ timeout,
+ &transmit_ready_callback_wrapper,
+ client);
+ return &client->th;
}
+
+/**
+ * Abort transmission request.
+ *
+ * @param th request to abort
+ */
+void
+GNUNET_SERVER_notify_transmit_ready_cancel (struct GNUNET_SERVER_TransmitHandle *th)
+{
+ GNUNET_CONNECTION_notify_transmit_ready_cancel (th->cth);
+ th->cth = NULL;
+ th->callback = NULL;
+}
+
+
/**
* Set the persistent flag on this client, used to setup client connection
* to only be killed when the service it's connected to is actually dead.
client->persist = GNUNET_YES;
}
+
/**
* Resume receiving from this client, we are done processing the
* current request. This function must be called from within each
void
GNUNET_SERVER_receive_done (struct GNUNET_SERVER_Client *client, int success)
{
- if (client == NULL)
+ if (NULL == client)
return;
GNUNET_assert (client->suspended > 0);
client->suspended--;
- if (success != GNUNET_OK)
- {
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNUNET_SERVER_receive_done called with failure indication\n");
-#endif
+ if (GNUNET_OK != success)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "GNUNET_SERVER_receive_done called with failure indication\n");
+ if ( (client->reference_count > 0) || (client->suspended > 0) )
+ client->shutdown_now = GNUNET_YES;
+ else
GNUNET_SERVER_client_disconnect (client);
- return;
- }
+ return;
+ }
if (client->suspended > 0)
- {
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNUNET_SERVER_receive_done called, but more clients pending\n");
-#endif
- return;
- }
- if (client->in_process_client_buffer == GNUNET_YES)
- {
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNUNET_SERVER_receive_done called while still in processing loop\n");
-#endif
- return;
- }
- if (client->server == NULL)
- {
- GNUNET_SERVER_client_disconnect (client);
- return;
- }
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNUNET_SERVER_receive_done causes restart in reading from the socket\n");
-#endif
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "GNUNET_SERVER_receive_done called, but more clients pending\n");
+ return;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != client->warn_task)
+ {
+ GNUNET_SCHEDULER_cancel (client->warn_task);
+ client->warn_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (GNUNET_YES == client->in_process_client_buffer)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "GNUNET_SERVER_receive_done called while still in processing loop\n");
+ return;
+ }
+ if ((NULL == client->server) || (GNUNET_YES == client->shutdown_now))
+ {
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "GNUNET_SERVER_receive_done causes restart in reading from the socket\n");
GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == client->restart_task);
- client->restart_task = GNUNET_SCHEDULER_add_now (client->server->sched,
- &restart_processing,
- client);
+ client->restart_task = GNUNET_SCHEDULER_add_now (&restart_processing, client);
}
-/**
- * Configure this server's connections to continue handling client
- * requests as usual even after we get a shutdown signal. The change
- * only applies to clients that connect to the server from the outside
- * using TCP after this call. Clients managed previously or those
- * added using GNUNET_SERVER_connect_socket and
- * GNUNET_SERVER_connect_callback are not affected by this option.
- *
- * @param h server handle
- * @param do_ignore GNUNET_YES to ignore, GNUNET_NO to restore default
- */
-void
-GNUNET_SERVER_ignore_shutdown (struct GNUNET_SERVER_Handle *h, int do_ignore)
-{
- h->clients_ignore_shutdown = do_ignore;
-}
-
/* end of server.c */