* @file util/server.c
* @brief library for building GNUnet network servers
* @author Christian Grothoff
- *
- * TODO:
- * - fix inefficient memmove in message processing
*/
#include "platform.h"
#include "gnunet_server_lib.h"
#include "gnunet_time_lib.h"
#include "gnunet_disk_lib.h"
+#include "gnunet_protocols.h"
#define DEBUG_SERVER GNUNET_NO
*/
struct GNUNET_SERVER_Handle
{
- /**
- * My scheduler.
- */
- struct GNUNET_SCHEDULER_Handle *sched;
-
/**
* List of handlers for incoming messages.
*/
void *access_cls;
/**
- * After how long should an idle connection time
- * out (on write).
- */
- struct GNUNET_TIME_Relative idle_timeout;
-
- /**
- * maximum write buffer size for accepted sockets
+ * NULL-terminated array of sockets used to listen for new
+ * connections.
*/
- size_t maxbuf;
+ struct GNUNET_NETWORK_Handle **listen_sockets;
/**
- * Socket used to listen for new connections. Set to
- * "-1" by GNUNET_SERVER_destroy to initiate shutdown.
+ * After how long should an idle connection time
+ * out (on write).
*/
- struct GNUNET_NETWORK_Handle *listen_socket;
+ struct GNUNET_TIME_Relative idle_timeout;
/**
* Task scheduled to do the listening.
GNUNET_SCHEDULER_TaskIdentifier listen_task;
/**
- * Do we ignore messages of types that we do not
- * understand or do we require that a handler
- * is found (and if not kill the connection)?
+ * Do we ignore messages of types that we do not understand or do we
+ * require that a handler is found (and if not kill the connection)?
*/
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).
+ */
+ int clients_ignore_shutdown;
+
};
{
/**
- * Size of the buffer for incoming data. Should be
- * first so we get nice alignment.
+ * This is a linked list.
*/
- char incoming_buffer[GNUNET_SERVER_MAX_MESSAGE_SIZE];
+ struct GNUNET_SERVER_Client *next;
/**
- * This is a linked list.
+ * Processing of incoming data.
*/
- struct GNUNET_SERVER_Client *next;
+ struct GNUNET_SERVER_MessageStreamTokenizer *mst;
/**
* Server that this client belongs to.
/**
* Client closure for callbacks.
*/
- void *client_closure;
-
- /**
- * Callback to receive from client.
- */
- GNUNET_SERVER_ReceiveCallback receive;
-
- /**
- * Callback to cancel receive from client.
- */
- GNUNET_SERVER_ReceiveCancelCallback receive_cancel;
-
- /**
- * Callback to ask about transmit-ready notification.
- */
- GNUNET_SERVER_TransmitReadyCallback notify_transmit_ready;
-
- /**
- * Callback to ask about transmit-ready notification.
- */
- GNUNET_SERVER_TransmitReadyCancelCallback notify_transmit_ready_cancel;
-
- /**
- * Callback to check if client is still valid.
- */
- GNUNET_SERVER_CheckCallback check;
-
- /**
- * Callback to destroy client.
- */
- GNUNET_SERVER_DestroyCallback destroy;
-
- /**
- * Side-buffer for incoming data used when processing
- * is suspended.
- */
- char *side_buf;
+ struct GNUNET_CONNECTION_Handle *connection;
/**
- * Number of bytes in the side buffer.
+ * ID of task used to restart processing.
*/
- size_t side_buf_size;
+ GNUNET_SCHEDULER_TaskIdentifier restart_task;
/**
* Last activity on this socket (used to time it out
*/
struct GNUNET_TIME_Absolute last_activity;
- /**
- * How many bytes in the "incoming_buffer" are currently
- * valid? (starting at offset 0).
- */
- size_t receive_pos;
-
/**
* Number of external entities with a reference to
* this client object.
*/
int shutdown_now;
+ /**
+ * Are we currently trying to receive? (YES if we are, NO if we are not,
+ * SYSERR if data is already available in MST).
+ */
+ int receive_pending;
+
+ /**
+ * 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;
};
/**
- * Scheduler says our listen socket is ready.
- * Process it!
+ * 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,
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 ();
- GNUNET_NETWORK_fdset_set (r, server->listen_socket);
+ 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))
{
- 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);
+ /* ignore shutdown, someone else will take care of it! */
+ server->listen_task = GNUNET_SCHEDULER_add_select (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! */
+ return;
}
- GNUNET_assert (GNUNET_NETWORK_fdset_isset
- (tc->read_ready, server->listen_socket));
- sock =
- GNUNET_CONNECTION_create_from_accept (tc->sched, server->access,
- server->access_cls,
- server->listen_socket,
- server->maxbuf);
- if (sock != NULL)
+ i = 0;
+ while (NULL != server->listen_sockets[i])
{
+ if (GNUNET_NETWORK_fdset_isset
+ (tc->read_ready, server->listen_sockets[i]))
+ {
+ sock =
+ GNUNET_CONNECTION_create_from_accept (server->access,
+ server->access_cls,
+ server->listen_sockets[i]);
+ if (sock != NULL)
+ {
#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Server accepted incoming connection.\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Server accepted incoming connection.\n");
#endif
- client = GNUNET_SERVER_connect_socket (server, sock);
- /* decrement reference count, we don't keep "client" alive */
- GNUNET_SERVER_client_drop (client);
+ 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++;
}
/* 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);
+ server->listen_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_HIGH,
+ GNUNET_SCHEDULER_NO_TASK,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ r, NULL,
+ &process_listen_socket,
+ server);
GNUNET_NETWORK_fdset_destroy (r);
}
/**
* Create and initialize a listen socket for the server.
*
+ * @param serverAddr address to listen on
+ * @param socklen length of address
* @return NULL on error, otherwise the listen socket
*/
static struct GNUNET_NETWORK_Handle *
const static int on = 1;
struct GNUNET_NETWORK_Handle *sock;
uint16_t port;
+ int eno;
switch (serverAddr->sa_family)
{
port = ntohs (((const struct sockaddr_in6 *) serverAddr)->sin6_port);
break;
default:
- GNUNET_break (0);
- return NULL;
+ 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 (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");
+ 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
+ }
/* bind the socket */
if (GNUNET_NETWORK_socket_bind (sock, serverAddr, socklen) != GNUNET_OK)
{
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _
- ("`%s' failed for port %d. Is the service already running?\n"),
- "bind", port);
+ 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;
}
if (GNUNET_OK != GNUNET_NETWORK_socket_listen (sock, 5))
{
GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
+ errno = 0;
return NULL;
}
#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Server starts to listen on port %u.\n", port);
+ if (port != 0)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Server starts to listen on port %u.\n", port);
#endif
return sock;
}
/**
* Create a new server.
*
- * @param sched scheduler to use
* @param access function for access control
* @param access_cls closure for access
- * @param serverAddr address to listen on (including port), use NULL
- * for internal server (no listening)
- * @param socklen length of serverAddr
- * @param maxbuf maximum write buffer size for accepted sockets
+ * @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
* (typically, "port" already in use)
*/
struct GNUNET_SERVER_Handle *
-GNUNET_SERVER_create (struct GNUNET_SCHEDULER_Handle *sched,
- GNUNET_CONNECTION_AccessCheck access,
- void *access_cls,
- const struct sockaddr *serverAddr,
- socklen_t socklen,
- size_t maxbuf,
- struct GNUNET_TIME_Relative
- idle_timeout, int require_found)
+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 *ret;
- struct GNUNET_NETWORK_Handle *lsock;
struct GNUNET_NETWORK_FDSet *r;
+ int i;
- lsock = NULL;
- if (serverAddr != NULL)
- {
- lsock = open_listen_socket (serverAddr, socklen);
- if (lsock == NULL)
- return NULL;
- }
ret = GNUNET_malloc (sizeof (struct GNUNET_SERVER_Handle));
- ret->sched = sched;
- ret->maxbuf = maxbuf;
ret->idle_timeout = idle_timeout;
- ret->listen_socket = lsock;
+ ret->listen_sockets = lsocks;
ret->access = access;
ret->access_cls = access_cls;
ret->require_found = require_found;
- if (lsock != NULL)
+ if (lsocks != NULL)
{
r = GNUNET_NETWORK_fdset_create ();
- GNUNET_NETWORK_fdset_set (r, ret->listen_socket);
- 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);
+ i = 0;
+ while (NULL != ret->listen_sockets[i])
+ GNUNET_NETWORK_fdset_set (r, ret->listen_sockets[i++]);
+ ret->listen_task = GNUNET_SCHEDULER_add_select (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;
}
+/**
+ * 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 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 (GNUNET_CONNECTION_AccessCheck access,
+ void *access_cls,
+ struct sockaddr *const *serverAddr,
+ const socklen_t * socklen,
+ struct GNUNET_TIME_Relative
+ idle_timeout, int require_found)
+{
+ struct GNUNET_NETWORK_Handle **lsocks;
+ unsigned int i;
+ unsigned int j;
+
+ i = 0;
+ while (serverAddr[i] != NULL)
+ i++;
+ if (i > 0)
+ {
+ 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;
+ }
+ }
+ else
+ {
+ lsocks = NULL;
+ }
+ return GNUNET_SERVER_create_with_sockets (access, access_cls,
+ lsocks,
+ idle_timeout,
+ require_found);
+}
+
+
/**
* Free resources held by this server.
+ *
+ * @param s server to destroy
*/
void
GNUNET_SERVER_destroy (struct GNUNET_SERVER_Handle *s)
{
- struct GNUNET_SERVER_Client *pos;
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);
+ GNUNET_SCHEDULER_cancel (s->listen_task);
s->listen_task = GNUNET_SCHEDULER_NO_TASK;
}
- GNUNET_break (GNUNET_OK ==
- GNUNET_NETWORK_socket_close (s->listen_socket));
- s->listen_socket = NULL;
- while (s->clients != NULL)
+ if (s->listen_sockets != NULL)
{
- pos = s->clients;
- s->clients = pos->next;
- pos->server = 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;
}
while (NULL != (npos = s->disconnect_notify_list))
{
+ npos->callback (npos->callback_cls, NULL);
s->disconnect_notify_list = npos->next;
GNUNET_free (npos);
}
while (pos->handlers[i].callback != NULL)
{
mh = &pos->handlers[i];
- if (mh->type == type)
+ if ( (mh->type == type) ||
+ (mh->type == GNUNET_MESSAGE_TYPE_ALL) )
{
if ((mh->expected_size != 0) && (mh->expected_size != size))
{
+#if GNUNET8_NETWORK_IS_DEAD
+ GNUNET_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;
}
if (sender != NULL)
if (found == GNUNET_NO)
{
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
- _("Received message of unknown type %d\n"), type);
+ "Received message of unknown type %d\n",
+ type);
if (server->require_found == GNUNET_YES)
return GNUNET_SYSERR;
}
/**
- * We're finished with this client and especially its input
- * processing. If the RC is zero, free all resources otherwise wait
- * until RC hits zero to do so.
+ * We are receiving an incoming message. Process it.
+ *
+ * @param cls our closure (handle for the client)
+ * @param buf buffer with data received from network
+ * @param available number of bytes available in buf
+ * @param addr address of the sender
+ * @param addrlen length of addr
+ * @param errCode code indicating errors receiving, 0 for success
*/
static void
-shutdown_incoming_processing (struct GNUNET_SERVER_Client *client)
-{
- struct GNUNET_SERVER_Client *prev;
- struct GNUNET_SERVER_Client *pos;
- struct GNUNET_SERVER_Handle *server;
- struct NotifyList *n;
- unsigned int rc;
-
- rc = client->reference_count;
- if (client->server != NULL)
- {
- server = client->server;
- client->server = NULL;
- 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;
- n = server->disconnect_notify_list;
- while (n != NULL)
- {
- n->callback (n->callback_cls, client);
- n = n->next;
- }
- }
- /* wait for RC to hit zero, then free */
- if (rc > 0)
- return;
- client->destroy (client->client_closure);
- GNUNET_free (client);
-}
+process_incoming (void *cls,
+ const void *buf,
+ size_t available,
+ const struct sockaddr *addr,
+ socklen_t addrlen, int errCode);
/**
- * Go over the contents of the client buffer; as long as full messages
- * are available, pass them on for processing. Update the buffer
- * accordingly. Handles fatal errors by shutting down the connection.
+ * Process messages from the client's message tokenizer until either
+ * the tokenizer is empty (and then schedule receiving more), or
+ * until some handler is not immediately done (then wait for restart_processing)
+ * or shutdown.
*
- * @param client identifies which client receive buffer to process
+ * @param client the client to process, RC must have already been increased
+ * using GNUNET_SERVER_client_keep and will be decreased by one in this
+ * function
+ * @param ret GNUNET_NO to start processing from the buffer,
+ * GNUNET_OK if the mst buffer is drained and we should instantly go back to receiving
+ * GNUNET_SYSERR if we should instantly abort due to error in a previous step
*/
static void
-process_client_buffer (struct GNUNET_SERVER_Client *client)
+process_mst (struct GNUNET_SERVER_Client *client,
+ int ret)
{
- struct GNUNET_SERVER_Handle *server;
- const struct GNUNET_MessageHeader *hdr;
- size_t msize;
-
- client->in_process_client_buffer = GNUNET_YES;
- server = client->server;
+ while ( (ret != GNUNET_SYSERR) &&
+ (client->server != NULL) &&
+ (GNUNET_YES != client->shutdown_now) &&
+ (0 == client->suspended) )
+ {
+ if (ret == GNUNET_OK)
+ {
+ client->receive_pending = GNUNET_YES;
#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Private buffer contains %u bytes; client is %s and we are %s\n",
- client->receive_pos,
- client->suspended ? "suspended" : "up",
- client->shutdown_now ? "in shutdown" : "running");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Server re-enters receive loop.\n");
#endif
- while ((client->receive_pos >= sizeof (struct GNUNET_MessageHeader)) &&
- (0 == client->suspended) && (GNUNET_YES != client->shutdown_now))
- {
- hdr = (const struct GNUNET_MessageHeader *) &client->incoming_buffer;
- msize = ntohs (hdr->size);
- if (msize > client->receive_pos)
- {
+ GNUNET_CONNECTION_receive (client->connection,
+ GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
+ client->server->idle_timeout,
+ &process_incoming, client);
+ break;
+ }
#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Total message size is %u, we only have %u bytes; need more data\n",
- msize, client->receive_pos);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Server processes additional messages instantly.\n");
#endif
- break;
- }
+ 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,
- "Passing %u bytes to callback for processing\n", msize);
+ "Server has more data pending but is suspended.\n");
#endif
- if ((msize < sizeof (struct GNUNET_MessageHeader)) ||
- (GNUNET_OK != GNUNET_SERVER_inject (server, client, hdr)))
- {
- client->in_process_client_buffer = GNUNET_NO;
- shutdown_incoming_processing (client);
- return;
- }
- /* FIXME: this is highly inefficient; we should
- try to avoid this if the new base address is
- already nicely aligned. See old handler code... */
- memmove (client->incoming_buffer,
- &client->incoming_buffer[msize], client->receive_pos - msize);
- client->receive_pos -= msize;
+ client->receive_pending = GNUNET_SYSERR; /* data pending */
}
- client->in_process_client_buffer = GNUNET_NO;
- if (GNUNET_YES == client->shutdown_now)
- shutdown_incoming_processing (client);
+ if ( (ret == GNUNET_SYSERR) ||
+ (GNUNET_YES == client->shutdown_now) )
+ GNUNET_SERVER_client_disconnect (client);
+ GNUNET_SERVER_client_drop (client);
}
process_incoming (void *cls,
const void *buf,
size_t available,
- const struct sockaddr *addr, socklen_t addrlen, int errCode)
+ const struct sockaddr *addr,
+ socklen_t addrlen, int errCode)
{
struct GNUNET_SERVER_Client *client = cls;
struct GNUNET_SERVER_Handle *server = client->server;
- const char *cbuf = buf;
- size_t maxcpy;
+ int ret;
+ GNUNET_assert (client->receive_pending == GNUNET_YES);
+ client->receive_pending = GNUNET_NO;
if ((buf == NULL) ||
(available == 0) ||
(errCode != 0) ||
(server == NULL) ||
(client->shutdown_now == GNUNET_YES) ||
- (GNUNET_YES != client->check (client->client_closure)))
+ (GNUNET_YES != GNUNET_CONNECTION_check (client->connection)))
{
/* other side closed connection, error connecting, etc. */
- shutdown_incoming_processing (client);
+ GNUNET_SERVER_client_disconnect (client);
return;
}
#if DEBUG_SERVER
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Server receives %u bytes from `%s'.\n",
- available, GNUNET_a2s (addr, addrlen));
+ (unsigned int) available,
+ GNUNET_a2s (addr, addrlen));
#endif
GNUNET_SERVER_client_keep (client);
client->last_activity = GNUNET_TIME_absolute_get ();
- /* process data (if available) */
- while (available > 0)
- {
- maxcpy = available;
- if (maxcpy > sizeof (client->incoming_buffer) - client->receive_pos)
- maxcpy = sizeof (client->incoming_buffer) - client->receive_pos;
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Can copy %u bytes to private buffer\n", maxcpy);
-#endif
- memcpy (&client->incoming_buffer[client->receive_pos], cbuf, maxcpy);
- client->receive_pos += maxcpy;
- cbuf += maxcpy;
- available -= maxcpy;
- if (0 < client->suspended)
- {
- if (available > 0)
- {
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Client has suspended processing; copying %u bytes to side buffer to be used later.\n",
- available);
-#endif
- GNUNET_assert (client->side_buf_size == 0);
- GNUNET_assert (client->side_buf == NULL);
- client->side_buf_size = available;
- client->side_buf = GNUNET_malloc (available);
- memcpy (client->side_buf, cbuf, available);
- available = 0;
- }
- break; /* do not run next client iteration! */
- }
-#if DEBUG_SERVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Now processing messages in private buffer\n");
-#endif
- process_client_buffer (client);
- }
- GNUNET_assert (available == 0);
- if ((client->suspended == 0) &&
- (GNUNET_YES != client->shutdown_now) && (client->server != NULL))
- {
- /* Finally, keep receiving! */
- client->receive (client->client_closure,
- GNUNET_SERVER_MAX_MESSAGE_SIZE,
- server->idle_timeout, &process_incoming, client);
- }
- if (GNUNET_YES == client->shutdown_now)
- shutdown_incoming_processing (client);
- GNUNET_SERVER_client_drop (client);
+ ret = GNUNET_SERVER_mst_receive (client->mst, client, buf, available, GNUNET_NO, GNUNET_YES);
+ process_mst (client, ret);
}
/**
- * FIXME: document.
+ * Task run to start again receiving from the network
+ * and process requests.
+ *
+ * @param cls our 'struct GNUNET_SERVER_Client*' to process more requests from
+ * @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;
- process_client_buffer (client);
- if (0 == client->suspended)
- client->receive (client->client_closure,
- GNUNET_SERVER_MAX_MESSAGE_SIZE,
- client->server->idle_timeout, &process_incoming, client);
-}
-
-
-/**
- * Add a client to the set of our clients and
- * start receiving.
- */
-static void
-add_client (struct GNUNET_SERVER_Handle *server,
- struct GNUNET_SERVER_Client *client)
-{
- client->server = server;
- client->last_activity = GNUNET_TIME_absolute_get ();
- client->next = server->clients;
- server->clients = client;
- client->receive (client->client_closure,
- GNUNET_SERVER_MAX_MESSAGE_SIZE,
- server->idle_timeout, &process_incoming, client);
+ 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 - 1,
+ 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
+ GNUNET_SERVER_client_keep (client);
+ client->receive_pending = GNUNET_NO;
+ process_mst (client, GNUNET_NO);
}
/**
- * Create a request for receiving data from a socket.
+ * This function is called whenever our inbound message tokenizer has
+ * received a complete message.
*
- * @param cls identifies the socket to receive from
- * @param max how much data to read at most
- * @param timeout when should this operation time out
- * @param receiver function to call for processing
- * @param receiver_cls closure for receiver
+ * @param cls closure (struct GNUNET_SERVER_Handle)
+ * @param client identification of the client (struct GNUNET_SERVER_Client*)
+ * @param message the actual message
*/
static void
-sock_receive (void *cls,
- size_t max,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_CONNECTION_Receiver receiver, void *receiver_cls)
-{
- GNUNET_CONNECTION_receive (cls, max, timeout, receiver, receiver_cls);
-}
-
-
-/**
- * Wrapper to cancel receiving from a socket.
- *
- * @param cls handle to the GNUNET_CONNECTION_Handle to cancel
- */
-static void
-sock_receive_cancel (void *cls)
-{
- GNUNET_CONNECTION_receive_cancel (cls);
-}
-
-
-/**
- * FIXME: document.
- */
-static void *
-sock_notify_transmit_ready (void *cls,
- size_t size,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_CONNECTION_TransmitReadyNotify notify,
- void *notify_cls)
-{
- return GNUNET_CONNECTION_notify_transmit_ready (cls, size, timeout, notify,
- notify_cls);
-}
-
-
-/**
- * FIXME: document.
- */
-static void
-sock_notify_transmit_ready_cancel (void *cls, void *h)
-{
- GNUNET_CONNECTION_notify_transmit_ready_cancel (h);
-}
-
-
-/**
- * Check if socket is still valid (no fatal errors have happened so far).
- *
- * @param cls the socket
- * @return GNUNET_YES if valid, GNUNET_NO otherwise
- */
-static int
-sock_check (void *cls)
+client_message_tokenizer_callback (void *cls,
+ void *client,
+ const struct GNUNET_MessageHeader *message)
{
- return GNUNET_CONNECTION_check (cls);
-}
-
+ struct GNUNET_SERVER_Handle *server = cls;
+ struct GNUNET_SERVER_Client *sender = client;
+ int ret;
-/**
- * Destroy this socket (free resources).
- *
- * @param cls the socket
- */
-static void
-sock_destroy (void *cls)
-{
- GNUNET_CONNECTION_destroy (cls);
+#if DEBUG_SERVER
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Tokenizer gives server message of type %u from client\n",
+ ntohs (message->type));
+#endif
+ 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);
}
struct GNUNET_SERVER_Client *client;
client = GNUNET_malloc (sizeof (struct GNUNET_SERVER_Client));
- client->client_closure = connection;
- client->receive = &sock_receive;
- client->receive_cancel = &sock_receive_cancel;
- client->notify_transmit_ready = &sock_notify_transmit_ready;
- client->notify_transmit_ready_cancel = &sock_notify_transmit_ready_cancel;
- client->check = &sock_check;
- client->destroy = &sock_destroy;
- client->reference_count = 1;
- add_client (server, client);
- return client;
-}
-
-
-/**
- * Add an arbitrary connection to the set of handles managed by this
- * server. This can be used if a sending and receiving does not
- * really go over the network (internal transmission) or for servers
- * using UDP.
- *
- * @param server the server to use
- * @param chandle opaque handle for the connection
- * @param creceive receive function for the connection
- * @param ccancel cancel receive function for the connection
- * @param cnotify transmit notification function for the connection
- * @param cnotify_cancel transmit notification cancellation function for the connection
- * @param ccheck function to test if the connection is still up
- * @param cdestroy function to close and free the connection
- * @return the client handle (client should call
- * "client_drop" on the return value eventually)
- */
-struct GNUNET_SERVER_Client *
-GNUNET_SERVER_connect_callback (struct
- GNUNET_SERVER_Handle
- *server,
- void *chandle,
- GNUNET_SERVER_ReceiveCallback
- creceive,
- GNUNET_SERVER_ReceiveCancelCallback
- ccancel,
- GNUNET_SERVER_TransmitReadyCallback
- cnotify,
- GNUNET_SERVER_TransmitReadyCancelCallback
- cnotify_cancel,
- GNUNET_SERVER_CheckCallback
- ccheck,
- GNUNET_SERVER_DestroyCallback cdestroy)
-{
- struct GNUNET_SERVER_Client *client;
-
- client = GNUNET_malloc (sizeof (struct GNUNET_SERVER_Client));
- client->client_closure = chandle;
- client->receive = creceive;
- client->receive_cancel = ccancel;
- client->notify_transmit_ready = cnotify;
- client->notify_transmit_ready_cancel = cnotify_cancel;
- client->check = ccheck;
- client->destroy = cdestroy;
+ client->connection = connection;
+ client->mst = GNUNET_SERVER_mst_create (&client_message_tokenizer_callback,
+ server);
client->reference_count = 1;
- add_client (server, client);
+ client->server = server;
+ client->last_activity = GNUNET_TIME_absolute_get ();
+ client->next = server->clients;
+ server->clients = client;
+ client->receive_pending = GNUNET_YES;
+ GNUNET_CONNECTION_receive (client->connection,
+ GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
+ server->idle_timeout, &process_incoming, client);
return client;
}
{
GNUNET_assert (client->reference_count > 0);
client->reference_count--;
- if ((client->server == NULL) && (client->reference_count == 0))
- shutdown_incoming_processing (client);
+ if ( (client->shutdown_now == GNUNET_YES) &&
+ (client->reference_count == 0) )
+ GNUNET_SERVER_client_disconnect (client);
}
GNUNET_SERVER_client_get_address (struct GNUNET_SERVER_Client *client,
void **addr, size_t * addrlen)
{
- if (client->receive != &sock_receive)
- return GNUNET_SYSERR; /* not a network client */
- return GNUNET_CONNECTION_get_address (client->client_closure,
+ return GNUNET_CONNECTION_get_address (client->connection,
addr, addrlen);
}
}
+/**
+ * Ask the server to stop notifying us whenever a client disconnects.
+ *
+ * @param server the server manageing the clients
+ * @param callback function to call on disconnect
+ * @param callback_cls closure for callback
+ */
+void
+GNUNET_SERVER_disconnect_notify_cancel (struct GNUNET_SERVER_Handle *server,
+ 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;
+ GNUNET_free (pos);
+}
+
+
/**
* 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)
{
- if (client->server == NULL)
- return; /* already disconnected */
- client->receive_cancel (client->client_closure);
- shutdown_incoming_processing (client);
+ struct GNUNET_SERVER_Client *prev;
+ struct GNUNET_SERVER_Client *pos;
+ struct GNUNET_SERVER_Handle *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->restart_task);
+ client->restart_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (GNUNET_YES == client->receive_pending)
+ {
+ GNUNET_CONNECTION_receive_cancel (client->connection);
+ client->receive_pending = GNUNET_NO;
+ }
+
+ 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 (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);
}
GNUNET_CONNECTION_TransmitReadyNotify
callback, void *callback_cls)
{
- return client->notify_transmit_ready (client->client_closure,
- size,
- timeout, callback, callback_cls);
+ return GNUNET_CONNECTION_notify_transmit_ready (client->connection,
+ size,
+ timeout, callback, callback_cls);
}
+/**
+ * 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.
+ *
+ * @param client the client to set the persistent flag on
+ */
+void
+GNUNET_SERVER_client_persist_ (struct GNUNET_SERVER_Client *client)
+{
+ client->persist = GNUNET_YES;
+}
/**
* Resume receiving from this client, we are done processing the
* @param client client we were processing a message of
* @param success GNUNET_OK to keep the connection open and
* continue to receive
+ * GNUNET_NO to close the connection (normal behavior)
* GNUNET_SYSERR to close the connection (signal
* serious error)
*/
void
GNUNET_SERVER_receive_done (struct GNUNET_SERVER_Client *client, int success)
{
- char *sb;
-
if (client == NULL)
return;
GNUNET_assert (client->suspended > 0);
client->suspended--;
if (success != GNUNET_OK)
- client->shutdown_now = GNUNET_YES;
+ {
+#if DEBUG_SERVER
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "GNUNET_SERVER_receive_done called with failure indication\n");
+#endif
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
if (client->suspended > 0)
- return;
+ {
+#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)
- return;
- if (client->side_buf_size > 0)
{
- /* resume processing from side-buf */
- sb = client->side_buf;
- client->side_buf = NULL;
- /* this will also resume the receive job */
- if (GNUNET_YES != client->shutdown_now)
- process_incoming (client, sb, client->side_buf_size, NULL, 0, 0);
- else
- shutdown_incoming_processing (client);
- /* finally, free the side-buf */
- GNUNET_free (sb);
+#if DEBUG_SERVER
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "GNUNET_SERVER_receive_done called while still in processing loop\n");
+#endif
return;
}
- /* resume receive job */
- if (GNUNET_YES != client->shutdown_now)
+ if (client->server == NULL)
{
- GNUNET_SCHEDULER_add_continuation (client->server->sched,
- &restart_processing,
- client,
- GNUNET_SCHEDULER_REASON_PREREQ_DONE);
+ GNUNET_SERVER_client_disconnect (client);
return;
}
- shutdown_incoming_processing (client);
+#if DEBUG_SERVER
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "GNUNET_SERVER_receive_done causes restart in reading from the socket\n");
+#endif
+ GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == client->restart_task);
+ 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 */
projects / oweals / gnunet.git / blobdiff