libgnunetutil_la_SOURCES = \
bandwidth.c \
bio.c \
- client_new.c \
+ client.c \
common_allocation.c \
common_endian.c \
common_logging.c \
--- /dev/null
+/*
+ This file is part of GNUnet.
+ 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 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ 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., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+*/
+
+/**
+ * @file util/client.c
+ * @brief code for access to services
+ * @author Christian Grothoff
+ *
+ * Generic TCP code for reliable, record-oriented TCP
+ * connections between clients and service providers.
+ */
+#include "platform.h"
+#include "gnunet_protocols.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_resolver_service.h"
+#include "gnunet_socks.h"
+
+
+#define LOG(kind,...) GNUNET_log_from (kind, "util",__VA_ARGS__)
+
+
+/**
+ * Internal state for a client connected to a GNUnet service.
+ */
+struct ClientState;
+
+
+/**
+ * During connect, we try multiple possible IP addresses
+ * to find out which one might work.
+ */
+struct AddressProbe
+{
+
+ /**
+ * This is a linked list.
+ */
+ struct AddressProbe *next;
+
+ /**
+ * This is a doubly-linked list.
+ */
+ struct AddressProbe *prev;
+
+ /**
+ * The address; do not free (allocated at the end of this struct).
+ */
+ const struct sockaddr *addr;
+
+ /**
+ * Underlying OS's socket.
+ */
+ struct GNUNET_NETWORK_Handle *sock;
+
+ /**
+ * Connection for which we are probing.
+ */
+ struct ClientState *cstate;
+
+ /**
+ * Lenth of addr.
+ */
+ socklen_t addrlen;
+
+ /**
+ * Task waiting for the connection to finish connecting.
+ */
+ struct GNUNET_SCHEDULER_Task *task;
+};
+
+
+/**
+ * Internal state for a client connected to a GNUnet service.
+ */
+struct ClientState
+{
+
+ /**
+ * The connection handle, NULL if not live
+ */
+ struct GNUNET_NETWORK_Handle *sock;
+
+ /**
+ * Handle to a pending DNS lookup request, NULL if DNS is finished.
+ */
+ struct GNUNET_RESOLVER_RequestHandle *dns_active;
+
+ /**
+ * Our configuration.
+ */
+ const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+ /**
+ * Linked list of sockets we are currently trying out
+ * (during connect).
+ */
+ struct AddressProbe *ap_head;
+
+ /**
+ * Linked list of sockets we are currently trying out
+ * (during connect).
+ */
+ struct AddressProbe *ap_tail;
+
+ /**
+ * Name of the service we interact with.
+ */
+ char *service_name;
+
+ /**
+ * Hostname, if any.
+ */
+ char *hostname;
+
+ /**
+ * Next message to transmit to the service. NULL for none.
+ */
+ const struct GNUNET_MessageHeader *msg;
+
+ /**
+ * Task for trying to connect to the service.
+ */
+ struct GNUNET_SCHEDULER_Task *retry_task;
+
+ /**
+ * Task for sending messages to the service.
+ */
+ struct GNUNET_SCHEDULER_Task *send_task;
+
+ /**
+ * Task for sending messages to the service.
+ */
+ struct GNUNET_SCHEDULER_Task *recv_task;
+
+ /**
+ * Tokenizer for inbound messages.
+ */
+ struct GNUNET_MessageStreamTokenizer *mst;
+
+ /**
+ * Message queue under our control.
+ */
+ struct GNUNET_MQ_Handle *mq;
+
+ /**
+ * Timeout for receiving a response (absolute time).
+ */
+ struct GNUNET_TIME_Absolute receive_timeout;
+
+ /**
+ * Current value for our incremental back-off (for
+ * connect re-tries).
+ */
+ struct GNUNET_TIME_Relative back_off;
+
+ /**
+ * TCP port (0 for disabled).
+ */
+ unsigned long long port;
+
+ /**
+ * Offset in the message where we are for transmission.
+ */
+ size_t msg_off;
+
+ /**
+ * How often have we tried to connect?
+ */
+ unsigned int attempts;
+
+ /**
+ * Are we supposed to die? #GNUNET_SYSERR if destruction must be
+ * deferred, #GNUNET_NO by default, #GNUNET_YES if destruction was
+ * deferred.
+ */
+ int in_destroy;
+
+};
+
+
+/**
+ * Try to connect to the service.
+ *
+ * @param cls the `struct ClientState` to try to connect to the service
+ */
+static void
+start_connect (void *cls);
+
+
+/**
+ * We've failed for good to establish a connection (timeout or
+ * no more addresses to try).
+ *
+ * @param cstate the connection we tried to establish
+ */
+static void
+connect_fail_continuation (struct ClientState *cstate)
+{
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "Failed to establish connection to `%s', no further addresses to try.\n",
+ cstate->service_name);
+ 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);
+ cstate->retry_task
+ = GNUNET_SCHEDULER_add_delayed (cstate->back_off,
+ &start_connect,
+ cstate);
+}
+
+
+/**
+ * We are ready to send a message to the service.
+ *
+ * @param cls the `struct ClientState` with the `msg` to transmit
+ */
+static void
+transmit_ready (void *cls)
+{
+ 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;
+ }
+ 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;
+ }
+ cstate->msg = NULL;
+ GNUNET_MQ_impl_send_continue (cstate->mq);
+}
+
+
+/**
+ * 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 int
+recv_message (void *cls,
+ const struct GNUNET_MessageHeader *msg)
+{
+ struct ClientState *cstate = cls;
+
+ if (GNUNET_YES == cstate->in_destroy)
+ return GNUNET_SYSERR;
+ GNUNET_MQ_inject_message (cstate->mq,
+ msg);
+ if (GNUNET_YES == cstate->in_destroy)
+ return GNUNET_SYSERR;
+ return GNUNET_OK;
+}
+
+
+/**
+ * Cancel all remaining connect attempts
+ *
+ * @param cstate handle of the client state to process
+ */
+static void
+cancel_aps (struct ClientState *cstate)
+{
+ struct AddressProbe *pos;
+
+ while (NULL != (pos = cstate->ap_head))
+ {
+ 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);
+ }
+}
+
+
+/**
+ * Implement the destruction of a message queue. Implementations must
+ * not free @a mq, but should take care of @a impl_state.
+ *
+ * @param mq the message queue to destroy
+ * @param impl_state our `struct ClientState`
+ */
+static void
+connection_client_destroy_impl (struct GNUNET_MQ_Handle *mq,
+ void *impl_state)
+{
+ struct ClientState *cstate = impl_state;
+
+ if (GNUNET_SYSERR == cstate->in_destroy)
+ {
+ /* defer destruction */
+ cstate->in_destroy = GNUNET_YES;
+ cstate->mq = NULL;
+ return;
+ }
+ 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);
+}
+
+
+/**
+ * This function is called once we have data ready to read.
+ *
+ * @param cls `struct ClientState` with connection to read from
+ */
+static void
+receive_ready (void *cls)
+{
+ 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;
+ }
+ if (GNUNET_YES == cstate->in_destroy)
+ {
+ connection_client_destroy_impl (cstate->mq,
+ cstate);
+ return;
+ }
+ cstate->in_destroy = GNUNET_NO;
+ cstate->recv_task
+ = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ cstate->sock,
+ &receive_ready,
+ cstate);
+}
+
+
+/**
+ * We've succeeded in establishing a connection.
+ *
+ * @param cstate the connection we tried to establish
+ */
+static void
+connect_success_continuation (struct ClientState *cstate)
+{
+ 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);
+ }
+}
+
+
+/**
+ * Try connecting to the server using UNIX domain sockets.
+ *
+ * @param service_name name of service to connect to
+ * @param cfg configuration to use
+ * @return NULL on error, socket connected to UNIX otherwise
+ */
+static struct GNUNET_NETWORK_Handle *
+try_unixpath (const char *service_name,
+ const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+#if AF_UNIX
+ struct GNUNET_NETWORK_Handle *sock;
+ 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))
+ {
+ 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;
+ }
+ 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
+ {
+ int abstract;
+
+ abstract = GNUNET_CONFIGURATION_get_value_yesno (cfg,
+ "TESTING",
+ "USE_ABSTRACT_SOCKETS");
+ if (GNUNET_YES == abstract)
+ s_un.sun_path[0] = '\0';
+ }
+#endif
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ un.sun_len = (u_char) sizeof (struct sockaddr_un);
+#endif
+ 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) ) )
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Successfully connected to unixpath `%s'!\n",
+ unixpath);
+ GNUNET_free (unixpath);
+ return sock;
+ }
+ }
+ GNUNET_free_non_null (unixpath);
+#endif
+ return NULL;
+}
+
+
+/**
+ * Scheduler let us know that we're either ready to write on the
+ * socket OR connect timed out. Do the right thing.
+ *
+ * @param cls the `struct AddressProbe *` with the address that we are probing
+ */
+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);
+}
+
+
+/**
+ * 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 ClientState *`
+ * @param addr address to try, NULL for "last call"
+ * @param addrlen length of @a addr
+ */
+static void
+try_connect_using_address (void *cls,
+ const struct sockaddr *addr,
+ socklen_t addrlen)
+{
+ struct ClientState *cstate = cls;
+ struct AddressProbe *ap;
+
+ if (NULL == addr)
+ {
+ cstate->dns_active = NULL;
+ if ( (NULL == cstate->ap_head) &&
+ // (NULL == cstate->proxy_handshake) &&
+ (NULL == cstate->sock) )
+ connect_fail_continuation (cstate);
+ return;
+ }
+ 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);
+ 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);
+}
+
+
+/**
+ * Test whether the configuration has proper values for connection
+ * (UNIXPATH || (PORT && HOSTNAME)).
+ *
+ * @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 int
+test_service_configuration (const char *service_name,
+ const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+ 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
+
+ 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;
+}
+
+
+/**
+ * Try to connect to the service.
+ *
+ * @param cls the `struct ClientState` to try to connect to the service
+ */
+static void
+start_connect (void *cls)
+{
+ struct ClientState *cstate = cls;
+
+ 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))
+ {
+ socks_connect (cstate);
+ return;
+ }
+#endif
+
+ if ( (0 == (cstate->attempts++ % 2)) ||
+ (0 == cstate->port) ||
+ (NULL == cstate->hostname) )
+ {
+ /* 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)
+ {
+ connect_success_continuation (cstate);
+ return;
+ }
+ }
+ 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);
+}
+
+
+/**
+ * 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`
+ */
+static void
+connection_client_send_impl (struct GNUNET_MQ_Handle *mq,
+ const struct GNUNET_MessageHeader *msg,
+ void *impl_state)
+{
+ 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);
+}
+
+
+/**
+ * Cancel the currently sent message.
+ *
+ * @param mq message queue
+ * @param impl_state our `struct ClientState`
+ */
+static void
+connection_client_cancel_impl (struct GNUNET_MQ_Handle *mq,
+ void *impl_state)
+{
+ struct ClientState *cstate = impl_state;
+
+ GNUNET_assert (NULL != cstate->msg);
+ GNUNET_assert (0 == cstate->msg_off);
+ cstate->msg = NULL;
+ if (NULL != cstate->send_task)
+ {
+ GNUNET_SCHEDULER_cancel (cstate->send_task);
+ cstate->send_task = NULL;
+ }
+}
+
+
+/**
+ * Create a message queue to connect to a GNUnet service.
+ * If handlers are specfied, receive messages from the connection.
+ *
+ * @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
+ */
+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 ClientState *cstate;
+
+ 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);
+ }
+ }
+ 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_new.c */
+++ /dev/null
-/*
- This file is part of GNUnet.
- 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 3, or (at your
- option) any later version.
-
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- 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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA.
-*/
-
-/**
- * @file util/client.c
- * @brief code for access to services
- * @author Christian Grothoff
- *
- * Generic TCP code for reliable, record-oriented TCP
- * connections between clients and service providers.
- */
-#include "platform.h"
-#include "gnunet_protocols.h"
-#include "gnunet_util_lib.h"
-#include "gnunet_resolver_service.h"
-#include "gnunet_socks.h"
-
-
-#define LOG(kind,...) GNUNET_log_from (kind, "util",__VA_ARGS__)
-
-
-/**
- * Internal state for a client connected to a GNUnet service.
- */
-struct ClientState;
-
-
-/**
- * During connect, we try multiple possible IP addresses
- * to find out which one might work.
- */
-struct AddressProbe
-{
-
- /**
- * This is a linked list.
- */
- struct AddressProbe *next;
-
- /**
- * This is a doubly-linked list.
- */
- struct AddressProbe *prev;
-
- /**
- * The address; do not free (allocated at the end of this struct).
- */
- const struct sockaddr *addr;
-
- /**
- * Underlying OS's socket.
- */
- struct GNUNET_NETWORK_Handle *sock;
-
- /**
- * Connection for which we are probing.
- */
- struct ClientState *cstate;
-
- /**
- * Lenth of addr.
- */
- socklen_t addrlen;
-
- /**
- * Task waiting for the connection to finish connecting.
- */
- struct GNUNET_SCHEDULER_Task *task;
-};
-
-
-/**
- * Internal state for a client connected to a GNUnet service.
- */
-struct ClientState
-{
-
- /**
- * The connection handle, NULL if not live
- */
- struct GNUNET_NETWORK_Handle *sock;
-
- /**
- * Handle to a pending DNS lookup request, NULL if DNS is finished.
- */
- struct GNUNET_RESOLVER_RequestHandle *dns_active;
-
- /**
- * Our configuration.
- */
- const struct GNUNET_CONFIGURATION_Handle *cfg;
-
- /**
- * Linked list of sockets we are currently trying out
- * (during connect).
- */
- struct AddressProbe *ap_head;
-
- /**
- * Linked list of sockets we are currently trying out
- * (during connect).
- */
- struct AddressProbe *ap_tail;
-
- /**
- * Name of the service we interact with.
- */
- char *service_name;
-
- /**
- * Hostname, if any.
- */
- char *hostname;
-
- /**
- * Next message to transmit to the service. NULL for none.
- */
- const struct GNUNET_MessageHeader *msg;
-
- /**
- * Task for trying to connect to the service.
- */
- struct GNUNET_SCHEDULER_Task *retry_task;
-
- /**
- * Task for sending messages to the service.
- */
- struct GNUNET_SCHEDULER_Task *send_task;
-
- /**
- * Task for sending messages to the service.
- */
- struct GNUNET_SCHEDULER_Task *recv_task;
-
- /**
- * Tokenizer for inbound messages.
- */
- struct GNUNET_MessageStreamTokenizer *mst;
-
- /**
- * Message queue under our control.
- */
- struct GNUNET_MQ_Handle *mq;
-
- /**
- * Timeout for receiving a response (absolute time).
- */
- struct GNUNET_TIME_Absolute receive_timeout;
-
- /**
- * Current value for our incremental back-off (for
- * connect re-tries).
- */
- struct GNUNET_TIME_Relative back_off;
-
- /**
- * TCP port (0 for disabled).
- */
- unsigned long long port;
-
- /**
- * Offset in the message where we are for transmission.
- */
- size_t msg_off;
-
- /**
- * How often have we tried to connect?
- */
- unsigned int attempts;
-
- /**
- * Are we supposed to die? #GNUNET_SYSERR if destruction must be
- * deferred, #GNUNET_NO by default, #GNUNET_YES if destruction was
- * deferred.
- */
- int in_destroy;
-
-};
-
-
-/**
- * Try to connect to the service.
- *
- * @param cls the `struct ClientState` to try to connect to the service
- */
-static void
-start_connect (void *cls);
-
-
-/**
- * We've failed for good to establish a connection (timeout or
- * no more addresses to try).
- *
- * @param cstate the connection we tried to establish
- */
-static void
-connect_fail_continuation (struct ClientState *cstate)
-{
- LOG (GNUNET_ERROR_TYPE_WARNING,
- "Failed to establish connection to `%s', no further addresses to try.\n",
- cstate->service_name);
- 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);
- cstate->retry_task
- = GNUNET_SCHEDULER_add_delayed (cstate->back_off,
- &start_connect,
- cstate);
-}
-
-
-/**
- * We are ready to send a message to the service.
- *
- * @param cls the `struct ClientState` with the `msg` to transmit
- */
-static void
-transmit_ready (void *cls)
-{
- 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;
- }
- 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;
- }
- cstate->msg = NULL;
- GNUNET_MQ_impl_send_continue (cstate->mq);
-}
-
-
-/**
- * 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 int
-recv_message (void *cls,
- const struct GNUNET_MessageHeader *msg)
-{
- struct ClientState *cstate = cls;
-
- if (GNUNET_YES == cstate->in_destroy)
- return GNUNET_SYSERR;
- GNUNET_MQ_inject_message (cstate->mq,
- msg);
- if (GNUNET_YES == cstate->in_destroy)
- return GNUNET_SYSERR;
- return GNUNET_OK;
-}
-
-
-/**
- * Cancel all remaining connect attempts
- *
- * @param cstate handle of the client state to process
- */
-static void
-cancel_aps (struct ClientState *cstate)
-{
- struct AddressProbe *pos;
-
- while (NULL != (pos = cstate->ap_head))
- {
- 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);
- }
-}
-
-
-/**
- * Implement the destruction of a message queue. Implementations must
- * not free @a mq, but should take care of @a impl_state.
- *
- * @param mq the message queue to destroy
- * @param impl_state our `struct ClientState`
- */
-static void
-connection_client_destroy_impl (struct GNUNET_MQ_Handle *mq,
- void *impl_state)
-{
- struct ClientState *cstate = impl_state;
-
- if (GNUNET_SYSERR == cstate->in_destroy)
- {
- /* defer destruction */
- cstate->in_destroy = GNUNET_YES;
- cstate->mq = NULL;
- return;
- }
- 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);
-}
-
-
-/**
- * This function is called once we have data ready to read.
- *
- * @param cls `struct ClientState` with connection to read from
- */
-static void
-receive_ready (void *cls)
-{
- 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;
- }
- if (GNUNET_YES == cstate->in_destroy)
- {
- connection_client_destroy_impl (cstate->mq,
- cstate);
- return;
- }
- cstate->in_destroy = GNUNET_NO;
- cstate->recv_task
- = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
- cstate->sock,
- &receive_ready,
- cstate);
-}
-
-
-/**
- * We've succeeded in establishing a connection.
- *
- * @param cstate the connection we tried to establish
- */
-static void
-connect_success_continuation (struct ClientState *cstate)
-{
- 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);
- }
-}
-
-
-/**
- * Try connecting to the server using UNIX domain sockets.
- *
- * @param service_name name of service to connect to
- * @param cfg configuration to use
- * @return NULL on error, socket connected to UNIX otherwise
- */
-static struct GNUNET_NETWORK_Handle *
-try_unixpath (const char *service_name,
- const struct GNUNET_CONFIGURATION_Handle *cfg)
-{
-#if AF_UNIX
- struct GNUNET_NETWORK_Handle *sock;
- 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))
- {
- 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;
- }
- 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
- {
- int abstract;
-
- abstract = GNUNET_CONFIGURATION_get_value_yesno (cfg,
- "TESTING",
- "USE_ABSTRACT_SOCKETS");
- if (GNUNET_YES == abstract)
- s_un.sun_path[0] = '\0';
- }
-#endif
-#if HAVE_SOCKADDR_IN_SIN_LEN
- un.sun_len = (u_char) sizeof (struct sockaddr_un);
-#endif
- 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) ) )
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Successfully connected to unixpath `%s'!\n",
- unixpath);
- GNUNET_free (unixpath);
- return sock;
- }
- }
- GNUNET_free_non_null (unixpath);
-#endif
- return NULL;
-}
-
-
-/**
- * Scheduler let us know that we're either ready to write on the
- * socket OR connect timed out. Do the right thing.
- *
- * @param cls the `struct AddressProbe *` with the address that we are probing
- */
-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);
-}
-
-
-/**
- * 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 ClientState *`
- * @param addr address to try, NULL for "last call"
- * @param addrlen length of @a addr
- */
-static void
-try_connect_using_address (void *cls,
- const struct sockaddr *addr,
- socklen_t addrlen)
-{
- struct ClientState *cstate = cls;
- struct AddressProbe *ap;
-
- if (NULL == addr)
- {
- cstate->dns_active = NULL;
- if ( (NULL == cstate->ap_head) &&
- // (NULL == cstate->proxy_handshake) &&
- (NULL == cstate->sock) )
- connect_fail_continuation (cstate);
- return;
- }
- 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);
- 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);
-}
-
-
-/**
- * Test whether the configuration has proper values for connection
- * (UNIXPATH || (PORT && HOSTNAME)).
- *
- * @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 int
-test_service_configuration (const char *service_name,
- const struct GNUNET_CONFIGURATION_Handle *cfg)
-{
- 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
-
- 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;
-}
-
-
-/**
- * Try to connect to the service.
- *
- * @param cls the `struct ClientState` to try to connect to the service
- */
-static void
-start_connect (void *cls)
-{
- struct ClientState *cstate = cls;
-
- 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))
- {
- socks_connect (cstate);
- return;
- }
-#endif
-
- if ( (0 == (cstate->attempts++ % 2)) ||
- (0 == cstate->port) ||
- (NULL == cstate->hostname) )
- {
- /* 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)
- {
- connect_success_continuation (cstate);
- return;
- }
- }
- 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);
-}
-
-
-/**
- * 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`
- */
-static void
-connection_client_send_impl (struct GNUNET_MQ_Handle *mq,
- const struct GNUNET_MessageHeader *msg,
- void *impl_state)
-{
- 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);
-}
-
-
-/**
- * Cancel the currently sent message.
- *
- * @param mq message queue
- * @param impl_state our `struct ClientState`
- */
-static void
-connection_client_cancel_impl (struct GNUNET_MQ_Handle *mq,
- void *impl_state)
-{
- struct ClientState *cstate = impl_state;
-
- GNUNET_assert (NULL != cstate->msg);
- GNUNET_assert (0 == cstate->msg_off);
- cstate->msg = NULL;
- if (NULL != cstate->send_task)
- {
- GNUNET_SCHEDULER_cancel (cstate->send_task);
- cstate->send_task = NULL;
- }
-}
-
-
-/**
- * Create a message queue to connect to a GNUnet service.
- * If handlers are specfied, receive messages from the connection.
- *
- * @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
- */
-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 ClientState *cstate;
-
- 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);
- }
- }
- 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_new.c */
projects / oweals / gnunet.git / commitdiff