/*
This file is part of GNUnet.
- (C) 2001, 2002, 2006, 2008, 2009 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2001-2016 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 2, or (at your
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
* Generic TCP code for reliable, record-oriented TCP
* connections between clients and service providers.
*/
-
#include "platform.h"
-#include "gnunet_common.h"
-#include "gnunet_client_lib.h"
#include "gnunet_protocols.h"
-#include "gnunet_server_lib.h"
-#include "gnunet_scheduler_lib.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_resolver_service.h"
+#include "gnunet_socks.h"
+
+
+#define LOG(kind,...) GNUNET_log_from (kind, "util-client",__VA_ARGS__)
-#define DEBUG_CLIENT GNUNET_NO
/**
- * How often do we re-try tranmsitting requests before giving up?
- * Note that if we succeeded transmitting a request but failed to read
- * a response, we do NOT re-try.
+ * Internal state for a client connected to a GNUnet service.
*/
-#define MAX_ATTEMPTS 50
+struct ClientState;
+
/**
- * Handle for a transmission request.
+ * During connect, we try multiple possible IP addresses
+ * to find out which one might work.
*/
-struct GNUNET_CLIENT_TransmitHandle
+struct AddressProbe
{
- /**
- * Connection state.
- */
- struct GNUNET_CLIENT_Connection *sock;
/**
- * Function to call to get the data for transmission.
+ * This is a linked list.
*/
- GNUNET_CONNECTION_TransmitReadyNotify notify;
+ struct AddressProbe *next;
/**
- * Closure for notify.
+ * This is a doubly-linked list.
*/
- void *notify_cls;
+ struct AddressProbe *prev;
/**
- * Handle to the transmission with the underlying
- * connection.
+ * The address; do not free (allocated at the end of this struct).
*/
- struct GNUNET_CONNECTION_TransmitHandle *th;
+ const struct sockaddr *addr;
/**
- * If we are re-trying and are delaying to do so,
- * handle to the scheduled task managing the delay.
+ * Underlying OS's socket.
*/
- GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
-
- /**
- * Timeout for the operation overall.
- */
- struct GNUNET_TIME_Absolute timeout;
+ struct GNUNET_NETWORK_Handle *sock;
/**
- * Number of bytes requested.
+ * Connection for which we are probing.
*/
- size_t size;
+ struct ClientState *cstate;
/**
- * Are we allowed to re-try to connect without telling
- * the user (of this API) about the connection troubles?
+ * Lenth of addr.
*/
- int auto_retry;
+ socklen_t addrlen;
/**
- * Number of attempts left for transmitting the request. We may
- * fail the first time (say because the service is not yet up), in
- * which case (if auto_retry is set) we wait a bit and re-try
- * (timeout permitting).
+ * Task waiting for the connection to finish connecting.
*/
- unsigned int attempts_left;
-
+ struct GNUNET_SCHEDULER_Task *task;
};
/**
- * Context for processing
- * "GNUNET_CLIENT_transmit_and_get_response" requests.
+ * Internal state for a client connected to a GNUnet service.
*/
-struct TransmitGetResponseContext
+struct ClientState
{
- /**
- * Client handle.
- */
- struct GNUNET_CLIENT_Connection *sock;
-
- /**
- * Message to transmit; do not free, allocated
- * right after this struct.
- */
- const struct GNUNET_MessageHeader *hdr;
-
- /**
- * Timeout to use.
- */
- struct GNUNET_TIME_Absolute timeout;
/**
- * Function to call when done.
+ * The connection handle, NULL if not live
*/
- GNUNET_CLIENT_MessageHandler rn;
-
- /**
- * Closure for "rn".
- */
- void *rn_cls;
-};
-
-/**
- * Struct to refer to a GNUnet TCP connection.
- * This is more than just a socket because if the server
- * drops the connection, the client automatically tries
- * to reconnect (and for that needs connection information).
- */
-struct GNUNET_CLIENT_Connection
-{
+ struct GNUNET_NETWORK_Handle *sock;
/**
- * the socket handle, NULL if not live
+ * Handle to a pending DNS lookup request, NULL if DNS is finished.
*/
- struct GNUNET_CONNECTION_Handle *sock;
+ struct GNUNET_RESOLVER_RequestHandle *dns_active;
/**
* Our configuration.
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
- * Name of the service we interact with.
+ * Linked list of sockets we are currently trying out
+ * (during connect).
*/
- char *service_name;
+ struct AddressProbe *ap_head;
/**
- * Context of a transmit_and_get_response operation, NULL
- * if no such operation is pending.
+ * Linked list of sockets we are currently trying out
+ * (during connect).
*/
- struct TransmitGetResponseContext *tag;
+ struct AddressProbe *ap_tail;
/**
- * Handler for current receiver task.
+ * Name of the service we interact with.
*/
- GNUNET_CLIENT_MessageHandler receiver_handler;
+ char *service_name;
/**
- * Closure for receiver_handler.
+ * Hostname, if any.
*/
- void *receiver_handler_cls;
+ char *hostname;
/**
- * Handle for a pending transmission request, NULL if there is
- * none pending.
+ * Next message to transmit to the service. NULL for none.
*/
- struct GNUNET_CLIENT_TransmitHandle *th;
+ const struct GNUNET_MessageHeader *msg;
/**
- * Handler for service test completion (NULL unless in service_test)
+ * Task for trying to connect to the service.
*/
- GNUNET_SCHEDULER_Task test_cb;
+ struct GNUNET_SCHEDULER_Task *retry_task;
/**
- * Deadline for calling 'test_cb'.
+ * Task for sending messages to the service.
*/
- struct GNUNET_TIME_Absolute test_deadline;
+ struct GNUNET_SCHEDULER_Task *send_task;
/**
- * If we are re-trying and are delaying to do so,
- * handle to the scheduled task managing the delay.
+ * Task for sending messages to the service.
*/
- GNUNET_SCHEDULER_TaskIdentifier receive_task;
+ struct GNUNET_SCHEDULER_Task *recv_task;
/**
- * Closure for test_cb (NULL unless in service_test)
+ * Tokenizer for inbound messages.
*/
- void *test_cb_cls;
+ struct GNUNET_MessageStreamTokenizer *mst;
/**
- * Buffer for received message.
+ * Message queue under our control.
*/
- char *received_buf;
+ struct GNUNET_MQ_Handle *mq;
/**
* Timeout for receiving a response (absolute time).
struct GNUNET_TIME_Relative back_off;
/**
- * Number of bytes in received_buf that are valid.
- */
- size_t received_pos;
-
- /**
- * Size of received_buf.
+ * TCP port (0 for disabled).
*/
- unsigned int received_size;
-
- /**
- * Do we have a complete response in received_buf?
- */
- int msg_complete;
+ unsigned long long port;
/**
- * Are we currently busy doing receive-processing?
- * GNUNET_YES if so, GNUNET_NO if not.
+ * Offset in the message where we are for transmission.
*/
- int in_receive;
+ size_t msg_off;
/**
- * Are we ignoring shutdown signals?
+ * How often have we tried to connect?
*/
- int ignore_shutdown;
+ unsigned int attempts;
/**
- * How often have we tried to connect?
+ * Are we supposed to die? #GNUNET_SYSERR if destruction must be
+ * deferred, #GNUNET_NO by default, #GNUNET_YES if destruction was
+ * deferred.
*/
- unsigned int attempts;
+ int in_destroy;
};
/**
* Try to connect to the service.
*
- * @param service_name name of service to connect to
- * @param cfg configuration to use
- * @param attempt counter used to alternate between IP and UNIX domain sockets
- * @return NULL on error
- */
-static struct GNUNET_CONNECTION_Handle *
-do_connect (const char *service_name,
- const struct GNUNET_CONFIGURATION_Handle *cfg, unsigned int attempt)
-{
- struct GNUNET_CONNECTION_Handle *sock;
- char *hostname;
- char *unixpath;
- unsigned long long port;
-
- sock = NULL;
-#if AF_UNIX
- if (0 == (attempt % 2))
- {
- /* on even rounds, try UNIX */
- unixpath = NULL;
- if ((GNUNET_OK == GNUNET_CONFIGURATION_get_value_string (cfg, service_name, "UNIXPATH", &unixpath)) && (0 < strlen (unixpath))) /* We have a non-NULL unixpath, does that mean it's valid? */
- {
- sock = GNUNET_CONNECTION_create_from_connect_to_unixpath (cfg, unixpath);
- if (sock != NULL)
- {
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connected to unixpath `%s'!\n",
- unixpath);
-#endif
- GNUNET_free (unixpath);
- return sock;
- }
- }
- GNUNET_free_non_null (unixpath);
- }
-#endif
-
- if ((GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (cfg,
- service_name,
- "PORT",
- &port)) ||
- (port > 65535) ||
- (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_string (cfg,
- service_name,
- "HOSTNAME", &hostname)))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _
- ("Could not determine valid hostname and port for service `%s' from configuration.\n"),
- service_name);
- return NULL;
- }
- if (0 == strlen (hostname))
- {
- GNUNET_free (hostname);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Need a non-empty hostname for service `%s'.\n"),
- service_name);
- return NULL;
- }
- if (port == 0)
- {
-#if AF_UNIX
- if (0 != (attempt % 2))
- {
- /* try UNIX */
- unixpath = NULL;
- if ((GNUNET_OK ==
- GNUNET_CONFIGURATION_get_value_string (cfg,
- service_name,
- "UNIXPATH", &unixpath)) &&
- (0 < strlen (unixpath)))
- {
- sock = GNUNET_CONNECTION_create_from_connect_to_unixpath (cfg,
- unixpath);
- if (sock != NULL)
- {
- GNUNET_free (unixpath);
- GNUNET_free (hostname);
- return sock;
- }
- }
- GNUNET_free_non_null (unixpath);
- }
-#endif
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Port is 0 for service `%s', UNIXPATH did not work, returning NULL!\n",
- service_name);
-#endif
- GNUNET_free (hostname);
- return NULL;
- }
-
- sock = GNUNET_CONNECTION_create_from_connect (cfg, hostname, port);
- GNUNET_free (hostname);
- return sock;
-}
-
-
-/**
- * Get a connection with a service.
- *
- * @param service_name name of the service
- * @param cfg configuration to use
- * @return NULL on error (service unknown to configuration)
+ * @param cls the `struct ClientState` to try to connect to the service
*/
-struct GNUNET_CLIENT_Connection *
-GNUNET_CLIENT_connect (const char *service_name,
- const struct GNUNET_CONFIGURATION_Handle *cfg)
-{
- struct GNUNET_CLIENT_Connection *ret;
- struct GNUNET_CONNECTION_Handle *sock;
-
- sock = do_connect (service_name, cfg, 0);
- ret = GNUNET_malloc (sizeof (struct GNUNET_CLIENT_Connection));
- ret->attempts = 1;
- ret->sock = sock;
- ret->service_name = GNUNET_strdup (service_name);
- ret->cfg = cfg;
- ret->back_off = GNUNET_TIME_UNIT_MILLISECONDS;
- return ret;
-}
+static void
+start_connect (void *cls);
/**
- * Configure this connection to ignore shutdown signals.
+ * We've failed for good to establish a connection (timeout or
+ * no more addresses to try).
*
- * @param h client handle
- * @param do_ignore GNUNET_YES to ignore, GNUNET_NO to restore default
+ * @param cstate the connection we tried to establish
*/
-void
-GNUNET_CLIENT_ignore_shutdown (struct GNUNET_CLIENT_Connection *h,
- int do_ignore)
+static void
+connect_fail_continuation (struct ClientState *cstate)
{
- h->ignore_shutdown = do_ignore;
- if (h->sock != NULL)
- GNUNET_CONNECTION_ignore_shutdown (h->sock, do_ignore);
+ GNUNET_break (NULL == cstate->ap_head);
+ GNUNET_break (NULL == cstate->ap_tail);
+ GNUNET_break (NULL == cstate->dns_active);
+ GNUNET_break (NULL == cstate->sock);
+ GNUNET_assert (NULL == cstate->send_task);
+ GNUNET_assert (NULL == cstate->recv_task);
+ // GNUNET_assert (NULL == cstate->proxy_handshake);
+
+ cstate->back_off = GNUNET_TIME_STD_BACKOFF (cstate->back_off);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Failed to establish connection to `%s', no further addresses to try, will try again in %s.\n",
+ cstate->service_name,
+ GNUNET_STRINGS_relative_time_to_string (cstate->back_off,
+ GNUNET_YES));
+ cstate->retry_task
+ = GNUNET_SCHEDULER_add_delayed (cstate->back_off,
+ &start_connect,
+ cstate);
}
/**
- * Destroy connection with the service. This will automatically
- * cancel any pending "receive" request (however, the handler will
- * *NOT* be called, not even with a NULL message). Any pending
- * transmission request will also be cancelled UNLESS the callback for
- * the transmission request has already been called, in which case the
- * transmission 'finish_pending_write' argument determines whether or
- * not the write is guaranteed to complete before the socket is fully
- * destroyed (unless, of course, there is an error with the server in
- * which case the message may still be lost).
+ * We are ready to send a message to the service.
*
- * @param finish_pending_write should a transmission already passed to the
- * handle be completed?
- * @param sock handle to the service connection
+ * @param cls the `struct ClientState` with the `msg` to transmit
*/
-void
-GNUNET_CLIENT_disconnect (struct GNUNET_CLIENT_Connection *sock,
- int finish_pending_write)
+static void
+transmit_ready (void *cls)
{
- if (sock->in_receive == GNUNET_YES)
- {
- GNUNET_CONNECTION_receive_cancel (sock->sock);
- sock->in_receive = GNUNET_NO;
- }
- if (sock->th != NULL)
- {
- GNUNET_CLIENT_notify_transmit_ready_cancel (sock->th);
- sock->th = NULL;
- }
- if (NULL != sock->sock)
- {
- GNUNET_CONNECTION_destroy (sock->sock, finish_pending_write);
- sock->sock = NULL;
- }
- if (sock->receive_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (sock->receive_task);
- sock->receive_task = GNUNET_SCHEDULER_NO_TASK;
+ struct ClientState *cstate = cls;
+ ssize_t ret;
+ size_t len;
+ const char *pos;
+ int notify_in_flight;
+
+ cstate->send_task = NULL;
+ pos = (const char *) cstate->msg;
+ len = ntohs (cstate->msg->size);
+ GNUNET_assert (cstate->msg_off < len);
+ RETRY:
+ ret = GNUNET_NETWORK_socket_send (cstate->sock,
+ &pos[cstate->msg_off],
+ len - cstate->msg_off);
+ if (-1 == ret)
+ {
+ if (EINTR == errno)
+ goto RETRY;
+ GNUNET_MQ_inject_error (cstate->mq,
+ GNUNET_MQ_ERROR_WRITE);
+ return;
}
- if (sock->tag != NULL)
- {
- GNUNET_free (sock->tag);
- sock->tag = NULL;
+ notify_in_flight = (0 == cstate->msg_off);
+ cstate->msg_off += ret;
+ if (cstate->msg_off < len)
+ {
+ cstate->send_task
+ = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ cstate->sock,
+ &transmit_ready,
+ cstate);
+ if (notify_in_flight)
+ GNUNET_MQ_impl_send_in_flight (cstate->mq);
+ return;
}
- sock->receiver_handler = NULL;
- GNUNET_array_grow (sock->received_buf, sock->received_size, 0);
- GNUNET_free (sock->service_name);
- GNUNET_free (sock);
+ cstate->msg = NULL;
+ GNUNET_MQ_impl_send_continue (cstate->mq);
}
/**
- * Check if message is complete
+ * We have received a full message, pass to the MQ dispatcher.
+ * Called by the tokenizer via #receive_ready().
+ *
+ * @param cls the `struct ClientState`
+ * @param msg message we received.
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR to stop further processing
*/
-static void
-check_complete (struct GNUNET_CLIENT_Connection *conn)
+static int
+recv_message (void *cls,
+ const struct GNUNET_MessageHeader *msg)
{
- if ((conn->received_pos >= sizeof (struct GNUNET_MessageHeader)) &&
- (conn->received_pos >=
- ntohs (((const struct GNUNET_MessageHeader *) conn->received_buf)->
- size)))
- conn->msg_complete = GNUNET_YES;
+ struct ClientState *cstate = cls;
+
+ if (GNUNET_YES == cstate->in_destroy)
+ return GNUNET_SYSERR;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received message of type %u and size %u from %s\n",
+ ntohs (msg->type),
+ ntohs (msg->size),
+ cstate->service_name);
+ GNUNET_MQ_inject_message (cstate->mq,
+ msg);
+ if (GNUNET_YES == cstate->in_destroy)
+ return GNUNET_SYSERR;
+ return GNUNET_OK;
}
/**
- * Callback function for data received from the network. Note that
- * both "available" and "errCode" would be 0 if the read simply timed out.
+ * Cancel all remaining connect attempts
*
- * @param cls closure
- * @param buf pointer to received data
- * @param available number of bytes availabe in "buf",
- * possibly 0 (on errors)
- * @param addr address of the sender
- * @param addrlen size of addr
- * @param errCode value of errno (on errors receiving)
+ * @param cstate handle of the client state to process
*/
static void
-receive_helper (void *cls,
- const void *buf,
- size_t available,
- const struct sockaddr *addr, socklen_t addrlen, int errCode)
+cancel_aps (struct ClientState *cstate)
{
- struct GNUNET_CLIENT_Connection *conn = cls;
- struct GNUNET_TIME_Relative remaining;
- GNUNET_CLIENT_MessageHandler receive_handler;
- void *receive_handler_cls;
-
- GNUNET_assert (conn->msg_complete == GNUNET_NO);
- conn->in_receive = GNUNET_NO;
- if ((available == 0) || (conn->sock == NULL) || (errCode != 0))
- {
- /* signal timeout! */
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Timeout in receive_helper, available %u, conn->sock %s, errCode `%s'\n",
- (unsigned int) available,
- conn->sock == NULL ? "NULL" : "non-NULL", STRERROR (errCode));
-#endif
- if (NULL != (receive_handler = conn->receiver_handler))
- {
- receive_handler_cls = conn->receiver_handler_cls;
- conn->receiver_handler = NULL;
- receive_handler (receive_handler_cls, NULL);
- }
- return;
- }
-
- /* FIXME: optimize for common fast case where buf contains the
- * entire message and we need no copying... */
-
+ struct AddressProbe *pos;
- /* slow path: append to array */
- if (conn->received_size < conn->received_pos + available)
- GNUNET_array_grow (conn->received_buf,
- conn->received_size, conn->received_pos + available);
- memcpy (&conn->received_buf[conn->received_pos], buf, available);
- conn->received_pos += available;
- check_complete (conn);
- /* check for timeout */
- remaining = GNUNET_TIME_absolute_get_remaining (conn->receive_timeout);
- if (remaining.rel_value == 0)
+ while (NULL != (pos = cstate->ap_head))
{
- /* signal timeout! */
- if (NULL != conn->receiver_handler)
- conn->receiver_handler (conn->receiver_handler_cls, NULL);
- return;
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_NETWORK_socket_close (pos->sock));
+ GNUNET_SCHEDULER_cancel (pos->task);
+ GNUNET_CONTAINER_DLL_remove (cstate->ap_head,
+ cstate->ap_tail,
+ pos);
+ GNUNET_free (pos);
}
- /* back to receive -- either for more data or to call callback! */
- GNUNET_CLIENT_receive (conn,
- conn->receiver_handler,
- conn->receiver_handler_cls, remaining);
}
/**
- * Continuation to call the receive callback.
+ * Implement the destruction of a message queue. Implementations must
+ * not free @a mq, but should take care of @a impl_state.
*
- * @param cls our handle to the client connection
- * @param tc scheduler context
+ * @param mq the message queue to destroy
+ * @param impl_state our `struct ClientState`
*/
static void
-receive_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+connection_client_destroy_impl (struct GNUNET_MQ_Handle *mq,
+ void *impl_state)
{
- struct GNUNET_CLIENT_Connection *sock = cls;
- GNUNET_CLIENT_MessageHandler handler = sock->receiver_handler;
- const struct GNUNET_MessageHeader *cmsg =
- (const struct GNUNET_MessageHeader *) sock->received_buf;
- void *handler_cls = sock->receiver_handler_cls;
- uint16_t msize = ntohs (cmsg->size);
- char mbuf[msize];
- struct GNUNET_MessageHeader *msg = (struct GNUNET_MessageHeader *) mbuf;
-
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received message of type %u and size %u\n",
- ntohs (cmsg->type), msize);
-#endif
- sock->receive_task = GNUNET_SCHEDULER_NO_TASK;
- GNUNET_assert (GNUNET_YES == sock->msg_complete);
- GNUNET_assert (sock->received_pos >= msize);
- memcpy (msg, cmsg, msize);
- memmove (sock->received_buf,
- &sock->received_buf[msize], sock->received_pos - msize);
- sock->received_pos -= msize;
- sock->msg_complete = GNUNET_NO;
- sock->receiver_handler = NULL;
- check_complete (sock);
- if (handler != NULL)
- handler (handler_cls, msg);
-}
-
+ struct ClientState *cstate = impl_state;
-/**
- * Read from the service.
- *
- * @param sock the service
- * @param handler function to call with the message
- * @param handler_cls closure for handler
- * @param timeout how long to wait until timing out
- */
-void
-GNUNET_CLIENT_receive (struct GNUNET_CLIENT_Connection *sock,
- GNUNET_CLIENT_MessageHandler handler,
- void *handler_cls, struct GNUNET_TIME_Relative timeout)
-{
- if (sock->sock == NULL)
+ if (GNUNET_SYSERR == cstate->in_destroy)
{
- /* already disconnected, fail instantly! */
- GNUNET_break (0); /* this should not happen in well-written code! */
- if (NULL != handler)
- handler (handler_cls, NULL);
+ /* defer destruction */
+ cstate->in_destroy = GNUNET_YES;
+ cstate->mq = NULL;
return;
}
- sock->receiver_handler = handler;
- sock->receiver_handler_cls = handler_cls;
- sock->receive_timeout = GNUNET_TIME_relative_to_absolute (timeout);
- if (GNUNET_YES == sock->msg_complete)
- {
- GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == sock->receive_task);
- sock->receive_task = GNUNET_SCHEDULER_add_now (&receive_task, sock);
- }
- else
- {
- GNUNET_assert (sock->in_receive == GNUNET_NO);
- sock->in_receive = GNUNET_YES;
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "calling GNUNET_CONNECTION_receive\n");
-#endif
- GNUNET_CONNECTION_receive (sock->sock,
- GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
- timeout, &receive_helper, sock);
- }
+ if (NULL != cstate->dns_active)
+ GNUNET_RESOLVER_request_cancel (cstate->dns_active);
+ if (NULL != cstate->send_task)
+ GNUNET_SCHEDULER_cancel (cstate->send_task);
+ if (NULL != cstate->recv_task)
+ GNUNET_SCHEDULER_cancel (cstate->recv_task);
+ if (NULL != cstate->retry_task)
+ GNUNET_SCHEDULER_cancel (cstate->retry_task);
+ if (NULL != cstate->sock)
+ GNUNET_NETWORK_socket_close (cstate->sock);
+ cancel_aps (cstate);
+ GNUNET_free (cstate->service_name);
+ GNUNET_free_non_null (cstate->hostname);
+ GNUNET_MST_destroy (cstate->mst);
+ GNUNET_free (cstate);
}
/**
- * Report service unavailable.
- */
-static void
-service_test_error (GNUNET_SCHEDULER_Task task, void *task_cls)
-{
- GNUNET_SCHEDULER_add_continuation (task,
- task_cls, GNUNET_SCHEDULER_REASON_TIMEOUT);
-}
-
-
-/**
- * Receive confirmation from test, service is up.
+ * This function is called once we have data ready to read.
*
- * @param cls closure
- * @param msg message received, NULL on timeout or fatal error
+ * @param cls `struct ClientState` with connection to read from
*/
static void
-confirm_handler (void *cls, const struct GNUNET_MessageHeader *msg)
+receive_ready (void *cls)
{
- struct GNUNET_CLIENT_Connection *conn = cls;
-
- /* We may want to consider looking at the reply in more
- * detail in the future, for example, is this the
- * correct service? FIXME! */
- if (msg != NULL)
- {
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received confirmation that service is running.\n");
-#endif
- GNUNET_SCHEDULER_add_continuation (conn->test_cb,
- conn->test_cb_cls,
- GNUNET_SCHEDULER_REASON_PREREQ_DONE);
+ struct ClientState *cstate = cls;
+ int ret;
+
+ cstate->recv_task = NULL;
+ cstate->in_destroy = GNUNET_SYSERR;
+ ret = GNUNET_MST_read (cstate->mst,
+ cstate->sock,
+ GNUNET_NO,
+ GNUNET_NO);
+ if (GNUNET_SYSERR == ret)
+ {
+ if (NULL != cstate->mq)
+ GNUNET_MQ_inject_error (cstate->mq,
+ GNUNET_MQ_ERROR_READ);
+ if (GNUNET_YES == cstate->in_destroy)
+ connection_client_destroy_impl (cstate->mq,
+ cstate);
+ return;
}
- else
+ if (GNUNET_YES == cstate->in_destroy)
{
- service_test_error (conn->test_cb, conn->test_cb_cls);
+ connection_client_destroy_impl (cstate->mq,
+ cstate);
+ return;
}
- GNUNET_CLIENT_disconnect (conn, GNUNET_NO);
+ cstate->in_destroy = GNUNET_NO;
+ cstate->recv_task
+ = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ cstate->sock,
+ &receive_ready,
+ cstate);
}
/**
- * Send the 'TEST' message to the service. If successful, prepare to
- * receive the reply.
+ * We've succeeded in establishing a connection.
*
- * @param cls the 'struct GNUNET_CLIENT_Connection' of the connection to test
- * @param size number of bytes available in buf
- * @param buf where to write the message
- * @return number of bytes written to buf
+ * @param cstate the connection we tried to establish
*/
-static size_t
-write_test (void *cls, size_t size, void *buf)
+static void
+connect_success_continuation (struct ClientState *cstate)
{
- struct GNUNET_CLIENT_Connection *conn = cls;
- struct GNUNET_MessageHeader *msg;
-
- if (size < sizeof (struct GNUNET_MessageHeader))
- {
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Failure to transmit TEST request.\n"));
-#endif
- service_test_error (conn->test_cb, conn->test_cb_cls);
- GNUNET_CLIENT_disconnect (conn, GNUNET_NO);
- return 0; /* client disconnected */
+ GNUNET_assert (NULL == cstate->recv_task);
+ cstate->recv_task
+ = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ cstate->sock,
+ &receive_ready,
+ cstate);
+ if (NULL != cstate->msg)
+ {
+ GNUNET_assert (NULL == cstate->send_task);
+ cstate->send_task
+ = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ cstate->sock,
+ &transmit_ready,
+ cstate);
}
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "TEST");
-#endif
- msg = (struct GNUNET_MessageHeader *) buf;
- msg->type = htons (GNUNET_MESSAGE_TYPE_TEST);
- msg->size = htons (sizeof (struct GNUNET_MessageHeader));
- GNUNET_CLIENT_receive (conn,
- &confirm_handler,
- conn,
- GNUNET_TIME_absolute_get_remaining
- (conn->test_deadline));
- return sizeof (struct GNUNET_MessageHeader);
}
/**
- * Test if the service is running. If we are given a UNIXPATH or a local address,
- * we do this NOT by trying to connect to the service, but by trying to BIND to
- * the same port. If the BIND fails, we know the service is running.
+ * Try connecting to the server using UNIX domain sockets.
*
- * @param service name of the service to wait for
+ * @param service_name name of service to connect to
* @param cfg configuration to use
- * @param timeout how long to wait at most
- * @param task task to run if service is running
- * (reason will be "PREREQ_DONE" (service running)
- * or "TIMEOUT" (service not known to be running))
- * @param task_cls closure for task
+ * @return NULL on error, socket connected to UNIX otherwise
*/
-void
-GNUNET_CLIENT_service_test (const char *service,
- const struct GNUNET_CONFIGURATION_Handle *cfg,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_SCHEDULER_Task task, void *task_cls)
+static struct GNUNET_NETWORK_Handle *
+try_unixpath (const char *service_name,
+ const struct GNUNET_CONFIGURATION_Handle *cfg)
{
- char *hostname;
- unsigned long long port;
+#if AF_UNIX
struct GNUNET_NETWORK_Handle *sock;
- struct GNUNET_CLIENT_Connection *conn;
-
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Testing if service `%s' is running.\n", service);
-#endif
-#ifdef AF_UNIX
- {
- /* probe UNIX support */
- struct sockaddr_un s_un;
- size_t slen;
- char *unixpath;
-
- unixpath = NULL;
- if ((GNUNET_OK == GNUNET_CONFIGURATION_get_value_string (cfg, service, "UNIXPATH", &unixpath)) && (0 < strlen (unixpath))) /* We have a non-NULL unixpath, does that mean it's valid? */
+ char *unixpath;
+ struct sockaddr_un s_un;
+
+ unixpath = NULL;
+ if ((GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_filename (cfg,
+ service_name,
+ "UNIXPATH",
+ &unixpath)) &&
+ (0 < strlen (unixpath)))
+ {
+ /* We have a non-NULL unixpath, need to validate it */
+ if (strlen (unixpath) >= sizeof (s_un.sun_path))
{
- if (strlen (unixpath) >= sizeof (s_un.sun_path))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("UNIXPATH `%s' too long, maximum length is %llu\n"),
- unixpath, sizeof (s_un.sun_path));
- }
- else
- {
- sock = GNUNET_NETWORK_socket_create (PF_UNIX, SOCK_STREAM, 0);
- if (sock != NULL)
- {
- memset (&s_un, 0, sizeof (s_un));
- s_un.sun_family = AF_UNIX;
- slen = strlen (unixpath) + 1;
- if (slen >= sizeof (s_un.sun_path))
- slen = sizeof (s_un.sun_path) - 1;
- memcpy (s_un.sun_path, unixpath, slen);
- s_un.sun_path[slen] = '\0';
- slen = sizeof (struct sockaddr_un);
-#if LINUX
- s_un.sun_path[0] = '\0';
-#endif
-#if HAVE_SOCKADDR_IN_SIN_LEN
- s_un.sun_len = (u_char) slen;
-#endif
- if (GNUNET_OK !=
- GNUNET_NETWORK_socket_bind (sock,
- (const struct sockaddr *) &s_un,
- slen))
- {
- /* failed to bind => service must be running */
- GNUNET_free (unixpath);
- (void) GNUNET_NETWORK_socket_close (sock);
- GNUNET_SCHEDULER_add_continuation (task,
- task_cls,
- GNUNET_SCHEDULER_REASON_PREREQ_DONE);
- return;
- }
- (void) GNUNET_NETWORK_socket_close (sock);
- }
- /* let's try IP */
- }
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("UNIXPATH `%s' too long, maximum length is %llu\n"),
+ unixpath,
+ (unsigned long long) sizeof (s_un.sun_path));
+ unixpath = GNUNET_NETWORK_shorten_unixpath (unixpath);
+ LOG (GNUNET_ERROR_TYPE_INFO,
+ _("Using `%s' instead\n"),
+ unixpath);
+ if (NULL == unixpath)
+ return NULL;
}
- GNUNET_free_non_null (unixpath);
- }
-#endif
-
- hostname = NULL;
- if ((GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (cfg,
- service,
- "PORT",
- &port)) ||
- (port > 65535) ||
- (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_string (cfg,
- service, "HOSTNAME", &hostname)))
- {
- /* UNIXPATH failed (if possible) AND IP failed => error */
- service_test_error (task, task_cls);
- return;
- }
-
- if (0 == strcmp ("localhost", hostname)
-#if WINDOWS
- && 0
-#endif
- )
- {
- /* can test using 'bind' */
- struct sockaddr_in s_in;
-
- memset (&s_in, 0, sizeof (s_in));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- s_in.sin_len = saddrlens[1];
-#endif
- s_in.sin_family = AF_INET;
- s_in.sin_port = htons (port);
-
- sock = GNUNET_NETWORK_socket_create (AF_INET, SOCK_STREAM, 0);
- if (sock != NULL)
+ memset (&s_un,
+ 0,
+ sizeof (s_un));
+ s_un.sun_family = AF_UNIX;
+ strncpy (s_un.sun_path,
+ unixpath,
+ sizeof (s_un.sun_path) - 1);
+#ifdef LINUX
{
- if (GNUNET_OK !=
- GNUNET_NETWORK_socket_bind (sock,
- (const struct sockaddr *) &s_in,
- sizeof (s_in)))
- {
- /* failed to bind => service must be running */
- GNUNET_free (hostname);
- (void) GNUNET_NETWORK_socket_close (sock);
- GNUNET_SCHEDULER_add_continuation (task,
- task_cls,
- GNUNET_SCHEDULER_REASON_PREREQ_DONE);
- return;
- }
- (void) GNUNET_NETWORK_socket_close (sock);
- }
- }
+ int abstract;
- if (0 == strcmp ("ip6-localhost", hostname)
-#if WINDOWS
- && 0
+ abstract = GNUNET_CONFIGURATION_get_value_yesno (cfg,
+ "TESTING",
+ "USE_ABSTRACT_SOCKETS");
+ if (GNUNET_YES == abstract)
+ s_un.sun_path[0] = '\0';
+ }
#endif
- )
- {
- /* can test using 'bind' */
- struct sockaddr_in6 s_in6;
-
- memset (&s_in6, 0, sizeof (s_in6));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- s_in6.sin6_len = saddrlens[1];
+#if HAVE_SOCKADDR_UN_SUN_LEN
+ s_un.sun_len = (u_char) sizeof (struct sockaddr_un);
#endif
- s_in6.sin6_family = AF_INET6;
- s_in6.sin6_port = htons (port);
-
- sock = GNUNET_NETWORK_socket_create (AF_INET6, SOCK_STREAM, 0);
- if (sock != NULL)
+ sock = GNUNET_NETWORK_socket_create (AF_UNIX,
+ SOCK_STREAM,
+ 0);
+ if ( (NULL != sock) &&
+ ( (GNUNET_OK ==
+ GNUNET_NETWORK_socket_connect (sock,
+ (struct sockaddr *) &s_un,
+ sizeof (s_un))) ||
+ (EINPROGRESS == errno) ) )
{
- if (GNUNET_OK !=
- GNUNET_NETWORK_socket_bind (sock,
- (const struct sockaddr *) &s_in6,
- sizeof (s_in6)))
- {
- /* failed to bind => service must be running */
- GNUNET_free (hostname);
- (void) GNUNET_NETWORK_socket_close (sock);
- GNUNET_SCHEDULER_add_continuation (task,
- task_cls,
- GNUNET_SCHEDULER_REASON_PREREQ_DONE);
- return;
- }
- (void) GNUNET_NETWORK_socket_close (sock);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Successfully connected to unixpath `%s'!\n",
+ unixpath);
+ GNUNET_free (unixpath);
+ return sock;
}
+ if (NULL != sock)
+ GNUNET_NETWORK_socket_close (sock);
}
-
- if (((0 == strcmp ("localhost", hostname)) ||
- (0 == strcmp ("ip6-localhost", hostname)))
-#if WINDOWS
- && 0
+ GNUNET_free_non_null (unixpath);
#endif
- )
- {
- /* all binds succeeded => claim service not running right now */
- GNUNET_free_non_null (hostname);
- service_test_error (task, task_cls);
- return;
- }
- GNUNET_free_non_null (hostname);
-
- /* non-localhost, try 'connect' method */
- conn = GNUNET_CLIENT_connect (service, cfg);
- if (conn == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _
- ("Could not connect to service `%s', must not be running.\n"),
- service);
- service_test_error (task, task_cls);
- return;
- }
- conn->test_cb = task;
- conn->test_cb_cls = task_cls;
- conn->test_deadline = GNUNET_TIME_relative_to_absolute (timeout);
-
- if (NULL == GNUNET_CLIENT_notify_transmit_ready (conn,
- sizeof (struct
- GNUNET_MessageHeader),
- timeout, GNUNET_YES,
- &write_test, conn))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Failure to transmit request to service `%s'\n"), service);
- service_test_error (task, task_cls);
- GNUNET_CLIENT_disconnect (conn, GNUNET_NO);
- return;
- }
+ return NULL;
}
/**
- * Connection notifies us about failure or success of
- * a transmission request. Either pass it on to our
- * user or, if possible, retry.
+ * Scheduler let us know that we're either ready to write on the
+ * socket OR connect timed out. Do the right thing.
*
- * @param cls our "struct GNUNET_CLIENT_TransmissionHandle"
- * @param size number of bytes available for transmission
- * @param buf where to write them
- * @return number of bytes written to buf
+ * @param cls the `struct AddressProbe *` with the address that we are probing
*/
-static size_t client_notify (void *cls, size_t size, void *buf);
+static void
+connect_probe_continuation (void *cls)
+{
+ struct AddressProbe *ap = cls;
+ struct ClientState *cstate = ap->cstate;
+ const struct GNUNET_SCHEDULER_TaskContext *tc;
+ int error;
+ socklen_t len;
+
+ ap->task = NULL;
+ GNUNET_assert (NULL != ap->sock);
+ GNUNET_CONTAINER_DLL_remove (cstate->ap_head,
+ cstate->ap_tail,
+ ap);
+ len = sizeof (error);
+ error = 0;
+ tc = GNUNET_SCHEDULER_get_task_context ();
+ if ( (0 == (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY)) ||
+ (GNUNET_OK !=
+ GNUNET_NETWORK_socket_getsockopt (ap->sock,
+ SOL_SOCKET,
+ SO_ERROR,
+ &error,
+ &len)) ||
+ (0 != error) )
+ {
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_NETWORK_socket_close (ap->sock));
+ GNUNET_free (ap);
+ if ( (NULL == cstate->ap_head) &&
+ // (NULL == cstate->proxy_handshake) &&
+ (NULL == cstate->dns_active) )
+ connect_fail_continuation (cstate);
+ return;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Connection to `%s' succeeded!\n",
+ cstate->service_name);
+ /* trigger jobs that waited for the connection */
+ GNUNET_assert (NULL == cstate->sock);
+ cstate->sock = ap->sock;
+ GNUNET_free (ap);
+ cancel_aps (cstate);
+ connect_success_continuation (cstate);
+}
/**
- * This task is run if we should re-try connection to the
- * service after a while.
+ * Try to establish a connection given the specified address.
+ * This function is called by the resolver once we have a DNS reply.
*
- * @param cls our "struct GNUNET_CLIENT_TransmitHandle" of the request
- * @param tc unused
+ * @param cls our `struct ClientState *`
+ * @param addr address to try, NULL for "last call"
+ * @param addrlen length of @a addr
*/
static void
-client_delayed_retry (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+try_connect_using_address (void *cls,
+ const struct sockaddr *addr,
+ socklen_t addrlen)
{
- struct GNUNET_CLIENT_TransmitHandle *th = cls;
- struct GNUNET_TIME_Relative delay;
+ struct ClientState *cstate = cls;
+ struct AddressProbe *ap;
- th->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ if (NULL == addr)
{
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmission failed due to shutdown.\n");
-#endif
- th->sock->th = NULL;
- th->notify (th->notify_cls, 0, NULL);
- GNUNET_free (th);
- return;
- }
- th->sock->sock = do_connect (th->sock->service_name,
- th->sock->cfg, th->sock->attempts++);
- if (NULL == th->sock->sock)
- {
- /* could happen if we're out of sockets */
- delay =
- GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining
- (th->timeout), th->sock->back_off);
- th->sock->back_off =
- GNUNET_TIME_relative_min (GNUNET_TIME_relative_multiply
- (th->sock->back_off, 2),
- GNUNET_TIME_UNIT_SECONDS);
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmission failed %u times, trying again in %llums.\n",
- MAX_ATTEMPTS - th->attempts_left,
- (unsigned long long) delay.rel_value);
-#endif
- th->reconnect_task = GNUNET_SCHEDULER_add_delayed (delay,
- &client_delayed_retry,
- th);
+ cstate->dns_active = NULL;
+ if ( (NULL == cstate->ap_head) &&
+ // (NULL == cstate->proxy_handshake) &&
+ (NULL == cstate->sock) )
+ connect_fail_continuation (cstate);
return;
}
- GNUNET_CONNECTION_ignore_shutdown (th->sock->sock, th->sock->ignore_shutdown);
- th->th = GNUNET_CONNECTION_notify_transmit_ready (th->sock->sock,
- th->size,
- GNUNET_TIME_absolute_get_remaining
- (th->timeout),
- &client_notify, th);
- if (th->th == NULL)
- {
+ if (NULL != cstate->sock)
+ return; /* already connected */
+ /* try to connect */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Trying to connect using address `%s:%u'\n",
+ GNUNET_a2s (addr,
+ addrlen),
+ cstate->port);
+ ap = GNUNET_malloc (sizeof (struct AddressProbe) + addrlen);
+ ap->addr = (const struct sockaddr *) &ap[1];
+ GNUNET_memcpy (&ap[1],
+ addr,
+ addrlen);
+ ap->addrlen = addrlen;
+ ap->cstate = cstate;
+
+ switch (ap->addr->sa_family)
+ {
+ case AF_INET:
+ ((struct sockaddr_in *) ap->addr)->sin_port = htons (cstate->port);
+ break;
+ case AF_INET6:
+ ((struct sockaddr_in6 *) ap->addr)->sin6_port = htons (cstate->port);
+ break;
+ default:
GNUNET_break (0);
- th->sock->th = NULL;
- th->notify (th->notify_cls, 0, NULL);
- GNUNET_free (th);
+ GNUNET_free (ap);
+ return; /* not supported by us */
+ }
+ ap->sock = GNUNET_NETWORK_socket_create (ap->addr->sa_family,
+ SOCK_STREAM,
+ 0);
+ if (NULL == ap->sock)
+ {
+ GNUNET_free (ap);
+ return; /* not supported by OS */
+ }
+ if ( (GNUNET_OK !=
+ GNUNET_NETWORK_socket_connect (ap->sock,
+ ap->addr,
+ ap->addrlen)) &&
+ (EINPROGRESS != errno) )
+ {
+ /* maybe refused / unsupported address, try next */
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_INFO,
+ "connect");
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_NETWORK_socket_close (ap->sock));
+ GNUNET_free (ap);
return;
}
+ GNUNET_CONTAINER_DLL_insert (cstate->ap_head,
+ cstate->ap_tail,
+ ap);
+ ap->task = GNUNET_SCHEDULER_add_write_net (GNUNET_CONNECTION_CONNECT_RETRY_TIMEOUT,
+ ap->sock,
+ &connect_probe_continuation,
+ ap);
}
/**
- * Connection notifies us about failure or success of a transmission
- * request. Either pass it on to our user or, if possible, retry.
+ * Test whether the configuration has proper values for connection
+ * (UNIXPATH || (PORT && HOSTNAME)).
*
- * @param cls our "struct GNUNET_CLIENT_TransmissionHandle"
- * @param size number of bytes available for transmission
- * @param buf where to write them
- * @return number of bytes written to buf
+ * @param service_name name of service to connect to
+ * @param cfg configuration to use
+ * @return #GNUNET_OK if the configuration is valid, #GNUNET_SYSERR if not
*/
-static size_t
-client_notify (void *cls, size_t size, void *buf)
+static int
+test_service_configuration (const char *service_name,
+ const struct GNUNET_CONFIGURATION_Handle *cfg)
{
- struct GNUNET_CLIENT_TransmitHandle *th = cls;
- size_t ret;
- struct GNUNET_TIME_Relative delay;
-
- th->th = NULL;
- th->sock->th = NULL;
- if (buf == NULL)
- {
- delay = GNUNET_TIME_absolute_get_remaining (th->timeout);
- delay.rel_value /= 2;
- if ((0 !=
- (GNUNET_SCHEDULER_REASON_SHUTDOWN & GNUNET_SCHEDULER_get_reason ())) ||
- (GNUNET_YES != th->auto_retry) || (0 == --th->attempts_left) ||
- (delay.rel_value < 1))
- {
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmission failed %u times, giving up.\n",
- MAX_ATTEMPTS - th->attempts_left);
-#endif
- GNUNET_break (0 == th->notify (th->notify_cls, 0, NULL));
- GNUNET_free (th);
- return 0;
- }
- /* auto-retry */
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Failed to connect to `%s', automatically trying again.\n",
- th->sock->service_name);
-#endif
- GNUNET_CONNECTION_destroy (th->sock->sock, GNUNET_NO);
- th->sock->sock = NULL;
- delay = GNUNET_TIME_relative_min (delay, th->sock->back_off);
- th->sock->back_off
- =
- GNUNET_TIME_relative_min (GNUNET_TIME_relative_multiply
- (th->sock->back_off, 2),
- GNUNET_TIME_UNIT_SECONDS);
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmission failed %u times, trying again in %llums.\n",
- MAX_ATTEMPTS - th->attempts_left,
- (unsigned long long) delay.rel_value);
+ int ret = GNUNET_SYSERR;
+ char *hostname = NULL;
+ unsigned long long port;
+#if AF_UNIX
+ char *unixpath = NULL;
+
+ if ((GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_filename (cfg,
+ service_name,
+ "UNIXPATH",
+ &unixpath)) &&
+ (0 < strlen (unixpath)))
+ ret = GNUNET_OK;
+ GNUNET_free_non_null (unixpath);
#endif
- th->sock->th = th;
- th->reconnect_task = GNUNET_SCHEDULER_add_delayed (delay,
- &client_delayed_retry,
- th);
- return 0;
- }
- GNUNET_assert (size >= th->size);
- ret = th->notify (th->notify_cls, size, buf);
- GNUNET_free (th);
+
+ if ( (GNUNET_YES ==
+ GNUNET_CONFIGURATION_have_value (cfg,
+ service_name,
+ "PORT")) &&
+ (GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_number (cfg,
+ service_name,
+ "PORT",
+ &port)) &&
+ (port <= 65535) &&
+ (0 != port) &&
+ (GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ service_name,
+ "HOSTNAME",
+ &hostname)) &&
+ (0 != strlen (hostname)) )
+ ret = GNUNET_OK;
+ GNUNET_free_non_null (hostname);
return ret;
}
/**
- * Ask the client to call us once the specified number of bytes
- * are free in the transmission buffer. May call the notify
- * method immediately if enough space is available.
+ * Try to connect to the service.
*
- * @param sock connection to the service
- * @param size number of bytes to send
- * @param timeout after how long should we give up (and call
- * notify with buf NULL and size 0)?
- * @param auto_retry if the connection to the service dies, should we
- * automatically re-connect and retry (within the timeout period)
- * or should we immediately fail in this case? Pass GNUNET_YES
- * if the caller does not care about temporary connection errors,
- * for example because the protocol is stateless
- * @param notify function to call
- * @param notify_cls closure for notify
- * @return NULL if our buffer will never hold size bytes,
- * a handle if the notify callback was queued (can be used to cancel)
+ * @param cls the `struct ClientState` to try to connect to the service
*/
-struct GNUNET_CLIENT_TransmitHandle *
-GNUNET_CLIENT_notify_transmit_ready (struct GNUNET_CLIENT_Connection *sock,
- size_t size,
- struct GNUNET_TIME_Relative timeout,
- int auto_retry,
- GNUNET_CONNECTION_TransmitReadyNotify
- notify, void *notify_cls)
+static void
+start_connect (void *cls)
{
- struct GNUNET_CLIENT_TransmitHandle *th;
+ struct ClientState *cstate = cls;
- if (NULL != sock->th)
+ cstate->retry_task = NULL;
+#if 0
+ /* Never use a local source if a proxy is configured */
+ if (GNUNET_YES ==
+ GNUNET_SOCKS_check_service (cstate->service_name,
+ cstate->cfg))
{
- /* If this breaks, you most likley called this function twice without waiting
- * for completion or canceling the request */
- GNUNET_break (0);
- return NULL;
+ socks_connect (cstate);
+ return;
}
- th = GNUNET_malloc (sizeof (struct GNUNET_CLIENT_TransmitHandle));
- th->sock = sock;
- th->size = size;
- th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
- th->auto_retry = auto_retry;
- th->notify = notify;
- th->notify_cls = notify_cls;
- th->attempts_left = MAX_ATTEMPTS;
- sock->th = th;
- if (sock->sock == NULL)
- {
- th->reconnect_task = GNUNET_SCHEDULER_add_delayed (sock->back_off,
- &client_delayed_retry,
- th);
+#endif
- }
- else
+ if ( (0 == (cstate->attempts++ % 2)) ||
+ (0 == cstate->port) ||
+ (NULL == cstate->hostname) )
{
- th->th = GNUNET_CONNECTION_notify_transmit_ready (sock->sock,
- size,
- timeout,
- &client_notify, th);
- if (NULL == th->th)
+ /* on even rounds, try UNIX first, or always
+ if we do not have a DNS name and TCP port. */
+ cstate->sock = try_unixpath (cstate->service_name,
+ cstate->cfg);
+ if (NULL != cstate->sock)
{
- GNUNET_break (0);
- GNUNET_free (th);
- sock->th = NULL;
- return NULL;
+ connect_success_continuation (cstate);
+ return;
}
}
- return th;
+ if ( (NULL == cstate->hostname) ||
+ (0 == cstate->port) )
+ {
+ /* All options failed. Boo! */
+ connect_fail_continuation (cstate);
+ return;
+ }
+ cstate->dns_active
+ = GNUNET_RESOLVER_ip_get (cstate->hostname,
+ AF_UNSPEC,
+ GNUNET_CONNECTION_CONNECT_RETRY_TIMEOUT,
+ &try_connect_using_address,
+ cstate);
}
/**
- * Cancel a request for notification.
- *
- * @param th handle from the original request.
+ * Implements the transmission functionality of a message queue.
+ *
+ * @param mq the message queue
+ * @param msg the message to send
+ * @param impl_state our `struct ClientState`
*/
-void
-GNUNET_CLIENT_notify_transmit_ready_cancel (struct
- GNUNET_CLIENT_TransmitHandle *th)
+static void
+connection_client_send_impl (struct GNUNET_MQ_Handle *mq,
+ const struct GNUNET_MessageHeader *msg,
+ void *impl_state)
{
- if (th->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_assert (NULL == th->th);
- GNUNET_SCHEDULER_cancel (th->reconnect_task);
- th->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
- }
- else
- {
- GNUNET_assert (NULL != th->th);
- GNUNET_CONNECTION_notify_transmit_ready_cancel (th->th);
- }
- th->sock->th = NULL;
- GNUNET_free (th);
+ struct ClientState *cstate = impl_state;
+
+ /* only one message at a time allowed */
+ GNUNET_assert (NULL == cstate->msg);
+ GNUNET_assert (NULL == cstate->send_task);
+ cstate->msg = msg;
+ cstate->msg_off = 0;
+ if (NULL == cstate->sock)
+ return; /* still waiting for connection */
+ cstate->send_task
+ = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ cstate->sock,
+ &transmit_ready,
+ cstate);
}
/**
- * Function called to notify a client about the socket
- * begin ready to queue the message. "buf" will be
- * NULL and "size" zero if the socket was closed for
- * writing in the meantime.
+ * Cancel the currently sent message.
*
- * @param cls closure of type "struct TransmitGetResponseContext*"
- * @param size number of bytes available in buf
- * @param buf where the callee should write the message
- * @return number of bytes written to buf
+ * @param mq message queue
+ * @param impl_state our `struct ClientState`
*/
-static size_t
-transmit_for_response (void *cls, size_t size, void *buf)
+static void
+connection_client_cancel_impl (struct GNUNET_MQ_Handle *mq,
+ void *impl_state)
{
- struct TransmitGetResponseContext *tc = cls;
- uint16_t msize;
+ struct ClientState *cstate = impl_state;
- tc->sock->tag = NULL;
- msize = ntohs (tc->hdr->size);
- if (NULL == buf)
+ GNUNET_assert (NULL != cstate->msg);
+ GNUNET_assert (0 == cstate->msg_off);
+ cstate->msg = NULL;
+ if (NULL != cstate->send_task)
{
-#if DEBUG_CLIENT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _
- ("Could not submit request, not expecting to receive a response.\n"));
-#endif
- if (NULL != tc->rn)
- tc->rn (tc->rn_cls, NULL);
- GNUNET_free (tc);
- return 0;
+ GNUNET_SCHEDULER_cancel (cstate->send_task);
+ cstate->send_task = NULL;
}
- GNUNET_assert (size >= msize);
- memcpy (buf, tc->hdr, msize);
- GNUNET_CLIENT_receive (tc->sock,
- tc->rn,
- tc->rn_cls,
- GNUNET_TIME_absolute_get_remaining (tc->timeout));
- GNUNET_free (tc);
- return msize;
}
/**
- * Convenience API that combines sending a request
- * to the service and waiting for a response.
- * If either operation times out, the callback
- * will be called with a "NULL" response (in which
- * case the connection should probably be destroyed).
+ * Create a message queue to connect to a GNUnet service.
+ * If handlers are specfied, receive messages from the connection.
*
- * @param sock connection to use
- * @param hdr message to transmit
- * @param timeout when to give up (for both transmission
- * and for waiting for a response)
- * @param auto_retry if the connection to the service dies, should we
- * automatically re-connect and retry (within the timeout period)
- * or should we immediately fail in this case? Pass GNUNET_YES
- * if the caller does not care about temporary connection errors,
- * for example because the protocol is stateless
- * @param rn function to call with the response
- * @param rn_cls closure for rn
- * @return GNUNET_OK on success, GNUNET_SYSERR if a request
- * is already pending
+ * @param cfg our configuration
+ * @param service_name name of the service to connect to
+ * @param handlers handlers for receiving messages, can be NULL
+ * @param error_handler error handler
+ * @param error_handler_cls closure for the @a error_handler
+ * @return the message queue, NULL on error
*/
-int
-GNUNET_CLIENT_transmit_and_get_response (struct GNUNET_CLIENT_Connection
- *sock,
- const struct GNUNET_MessageHeader
- *hdr,
- struct GNUNET_TIME_Relative timeout,
- int auto_retry,
- GNUNET_CLIENT_MessageHandler rn,
- void *rn_cls)
+struct GNUNET_MQ_Handle *
+GNUNET_CLIENT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const char *service_name,
+ const struct GNUNET_MQ_MessageHandler *handlers,
+ GNUNET_MQ_ErrorHandler error_handler,
+ void *error_handler_cls)
{
- struct TransmitGetResponseContext *tc;
- uint16_t msize;
+ struct ClientState *cstate;
- if (NULL != sock->th)
- return GNUNET_SYSERR;
- GNUNET_assert (sock->tag == NULL);
- msize = ntohs (hdr->size);
- tc = GNUNET_malloc (sizeof (struct TransmitGetResponseContext) + msize);
- tc->sock = sock;
- tc->hdr = (const struct GNUNET_MessageHeader *) &tc[1];
- memcpy (&tc[1], hdr, msize);
- tc->timeout = GNUNET_TIME_relative_to_absolute (timeout);
- tc->rn = rn;
- tc->rn_cls = rn_cls;
- if (NULL == GNUNET_CLIENT_notify_transmit_ready (sock,
- msize,
- timeout,
- auto_retry,
- &transmit_for_response, tc))
- {
- GNUNET_break (0);
- GNUNET_free (tc);
- return GNUNET_SYSERR;
+ if (GNUNET_OK !=
+ test_service_configuration (service_name,
+ cfg))
+ return NULL;
+ cstate = GNUNET_new (struct ClientState);
+ cstate->service_name = GNUNET_strdup (service_name);
+ cstate->cfg = cfg;
+ cstate->retry_task = GNUNET_SCHEDULER_add_now (&start_connect,
+ cstate);
+ cstate->mst = GNUNET_MST_create (&recv_message,
+ cstate);
+ if (GNUNET_YES ==
+ GNUNET_CONFIGURATION_have_value (cfg,
+ service_name,
+ "PORT"))
+ {
+ if (! ( (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (cfg,
+ service_name,
+ "PORT",
+ &cstate->port)) ||
+ (cstate->port > 65535) ||
+ (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ service_name,
+ "HOSTNAME",
+ &cstate->hostname)) ) &&
+ (0 == strlen (cstate->hostname)) )
+ {
+ GNUNET_free (cstate->hostname);
+ cstate->hostname = NULL;
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("Need a non-empty hostname for service `%s'.\n"),
+ service_name);
+ }
}
- sock->tag = tc;
- return GNUNET_OK;
+ cstate->mq = GNUNET_MQ_queue_for_callbacks (&connection_client_send_impl,
+ &connection_client_destroy_impl,
+ &connection_client_cancel_impl,
+ cstate,
+ handlers,
+ error_handler,
+ error_handler_cls);
+ return cstate->mq;
}
-
-
-/* end of client.c */
+/* end of client.c */
projects / oweals / gnunet.git / blobdiff