2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file util/connection.c
23 * @brief TCP connection management
24 * @author Christian Grothoff
26 * This code is rather complex. Only modify it if you
27 * 1) Have a NEW testcase showing that the new code
28 * is needed and correct
29 * 2) All EXISTING testcases pass with the new code
30 * These rules should apply in general, but for this
31 * module they are VERY, VERY important.
35 #include "gnunet_common.h"
36 #include "gnunet_connection_lib.h"
37 #include "gnunet_container_lib.h"
38 #include "gnunet_resolver_service.h"
39 #include "gnunet_scheduler_lib.h"
40 #include "gnunet_server_lib.h"
42 #define DEBUG_CONNECTION GNUNET_NO
45 * Possible functions to call after connect failed or succeeded.
47 enum ConnectContinuations
55 * Call "receive_again".
57 COCO_RECEIVE_AGAIN = 1,
60 * Call "transmit_ready".
62 COCO_TRANSMIT_READY = 2,
65 * Call "destroy_continuation".
67 COCO_DESTROY_CONTINUATION = 4
72 * Transmission handle. There can only be one for each connection.
74 struct GNUNET_CONNECTION_TransmitHandle
78 * Function to call if the send buffer has notify_size
81 GNUNET_CONNECTION_TransmitReadyNotify notify_ready;
84 * Closure for notify_ready.
86 void *notify_ready_cls;
91 struct GNUNET_CONNECTION_Handle *sh;
94 * Timeout for receiving (in absolute time).
96 struct GNUNET_TIME_Absolute transmit_timeout;
99 * Task called on timeout.
101 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
104 * At what number of bytes available in the
105 * write buffer should the notify method be called?
113 * During connect, we try multiple possible IP addresses
114 * to find out which one might work.
120 * This is a linked list.
122 struct AddressProbe *next;
125 * This is a doubly-linked list.
127 struct AddressProbe *prev;
130 * The address; do not free (allocated at the end of this struct).
132 const struct sockaddr *addr;
135 * Underlying OS's socket.
137 struct GNUNET_NETWORK_Handle *sock;
140 * Connection for which we are probing.
142 struct GNUNET_CONNECTION_Handle *h;
150 * Task waiting for the socket to finish connecting.
152 GNUNET_SCHEDULER_TaskIdentifier task;
157 * @brief handle for a network socket
159 struct GNUNET_CONNECTION_Handle
163 * Configuration to use.
165 const struct GNUNET_CONFIGURATION_Handle *cfg;
168 * Linked list of sockets we are currently trying out
171 struct AddressProbe *ap_head;
174 * Linked list of sockets we are currently trying out
177 struct AddressProbe *ap_tail;
180 * Network address of the other end-point, may be NULL.
182 struct sockaddr *addr;
185 * Pointer to the hostname if socket was
186 * created using DNS lookup, otherwise NULL.
191 * Underlying OS's socket, set to NULL after fatal errors.
193 struct GNUNET_NETWORK_Handle *sock;
196 * Function to call on data received, NULL if no receive is pending.
198 GNUNET_CONNECTION_Receiver receiver;
201 * Closure for receiver.
206 * Pointer to our write buffer.
211 * Current size of our write buffer.
213 size_t write_buffer_size;
216 * Current write-offset in write buffer (where
217 * would we write next).
219 size_t write_buffer_off;
222 * Current read-offset in write buffer (how many
223 * bytes have already been sent).
225 size_t write_buffer_pos;
233 * Read task that we may need to wait for.
235 GNUNET_SCHEDULER_TaskIdentifier read_task;
238 * Write task that we may need to wait for.
240 GNUNET_SCHEDULER_TaskIdentifier write_task;
243 * Destroy task (if already scheduled).
245 GNUNET_SCHEDULER_TaskIdentifier destroy_task;
248 * Handle to a pending DNS lookup request.
250 struct GNUNET_RESOLVER_RequestHandle *dns_active;
253 * The handle we return for GNUNET_CONNECTION_notify_transmit_ready.
255 struct GNUNET_CONNECTION_TransmitHandle nth;
258 * Timeout for receiving (in absolute time).
260 struct GNUNET_TIME_Absolute receive_timeout;
263 * Functions to call after connect failed or succeeded.
265 enum ConnectContinuations ccs;
268 * Maximum number of bytes to read (for receiving).
273 * Ignore GNUNET_SCHEDULER_REASON_SHUTDOWN for this socket.
278 * Port to connect to.
283 * When shutdown, do not ever actually close the socket, but
284 * free resources. Only should ever be set if using program
285 * termination as a signal (because only then will the leaked
293 * Set the persist option on this connection handle. Indicates
294 * that the underlying socket or fd should never really be closed.
295 * Used for indicating process death.
297 * @param sock the connection to set persistent
300 GNUNET_CONNECTION_persist_ (struct GNUNET_CONNECTION_Handle *sock)
302 sock->persist = GNUNET_YES;
307 * Disable the "CORK" feature for communication with the given socket,
308 * forcing the OS to immediately flush the buffer on transmission
309 * instead of potentially buffering multiple messages. Essentially
310 * reduces the OS send buffers to zero.
311 * Used to make sure that the last messages sent through the connection
312 * reach the other side before the process is terminated.
314 * @param sock the connection to make flushing and blocking
315 * @return GNUNET_OK on success
318 GNUNET_CONNECTION_disable_corking (struct GNUNET_CONNECTION_Handle *sock)
320 return GNUNET_NETWORK_socket_disable_corking (sock->sock);
324 * Create a socket handle by boxing an existing OS socket. The OS
325 * socket should henceforth be no longer used directly.
326 * GNUNET_socket_destroy will close it.
328 * @param osSocket existing socket to box
329 * @return the boxed socket handle
331 struct GNUNET_CONNECTION_Handle *
332 GNUNET_CONNECTION_create_from_existing (struct GNUNET_NETWORK_Handle *osSocket)
334 struct GNUNET_CONNECTION_Handle *ret;
336 ret = GNUNET_malloc (sizeof (struct GNUNET_CONNECTION_Handle));
337 ret->write_buffer_size = GNUNET_SERVER_MIN_BUFFER_SIZE;
338 ret->write_buffer = GNUNET_malloc (ret->write_buffer_size);
339 ret->sock = osSocket;
345 * Create a socket handle by accepting on a listen socket. This
346 * function may block if the listen socket has no connection ready.
348 * @param access function to use to check if access is allowed
349 * @param access_cls closure for access
350 * @param lsock listen socket
351 * @return the socket handle, NULL on error
353 struct GNUNET_CONNECTION_Handle *
354 GNUNET_CONNECTION_create_from_accept (GNUNET_CONNECTION_AccessCheck access,
356 struct GNUNET_NETWORK_Handle *lsock)
358 struct GNUNET_CONNECTION_Handle *ret;
361 struct GNUNET_NETWORK_Handle *sock;
363 struct sockaddr_in *v4;
364 struct sockaddr_in6 *v6;
367 struct GNUNET_CONNECTION_Credentials *gcp;
368 struct GNUNET_CONNECTION_Credentials gc;
375 addrlen = sizeof (addr);
377 GNUNET_NETWORK_socket_accept (lsock, (struct sockaddr *) &addr, &addrlen);
380 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "accept");
383 if ((addrlen > sizeof (addr)) || (addrlen < sizeof (sa_family_t)))
386 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
390 sa = (struct sockaddr *) addr;
391 v6 = (struct sockaddr_in6 *) addr;
392 if ((sa->sa_family == AF_INET6) && (IN6_IS_ADDR_V4MAPPED (&v6->sin6_addr)))
394 /* convert to V4 address */
395 v4 = GNUNET_malloc (sizeof (struct sockaddr_in));
396 memset (v4, 0, sizeof (struct sockaddr_in));
397 v4->sin_family = AF_INET;
398 #if HAVE_SOCKADDR_IN_SIN_LEN
399 v4->sin_len = (u_char) sizeof (struct sockaddr_in);
401 memcpy (&v4->sin_addr,
402 &((char *) &v6->sin6_addr)[sizeof (struct in6_addr) -
403 sizeof (struct in_addr)],
404 sizeof (struct in_addr));
405 v4->sin_port = v6->sin6_port;
407 addrlen = sizeof (struct sockaddr_in);
411 uaddr = GNUNET_malloc (addrlen);
412 memcpy (uaddr, addr, addrlen);
417 if (sa->sa_family == AF_UNIX)
421 if (0 == getpeereid (GNUNET_NETWORK_get_fd (sock), &gc.uid, &gc.gid))
425 /* largely traditional GNU/Linux */
428 getsockopt (GNUNET_NETWORK_get_fd (sock),
429 SOL_SOCKET, SO_PEERCRED, &uc, &olen)) &&
430 (olen == sizeof (uc)))
437 #if HAVE_GETPEERUCRED
438 /* this is for Solaris 10 */
442 if (0 == getpeerucred (GNUNET_NETWORK_get_fd (sock), &uc))
444 gc.uid = ucred_geteuid (uc);
445 gc.gid = ucred_getegid (uc);
454 if ((access != NULL) &&
455 (GNUNET_YES != (aret = access (access_cls, gcp, uaddr, addrlen))))
457 if (aret == GNUNET_NO)
458 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
459 _("Access denied to `%s'\n"), GNUNET_a2s (uaddr, addrlen));
460 GNUNET_break (GNUNET_OK ==
461 GNUNET_NETWORK_socket_shutdown (sock, SHUT_RDWR));
462 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
466 ret = GNUNET_malloc (sizeof (struct GNUNET_CONNECTION_Handle));
467 ret->write_buffer_size = GNUNET_SERVER_MIN_BUFFER_SIZE;
468 ret->write_buffer = GNUNET_malloc (ret->write_buffer_size);
470 ret->addrlen = addrlen;
473 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
474 _("Accepting connection from `%s': %p\n"),
475 GNUNET_a2s (uaddr, addrlen), ret);
481 * Obtain the network address of the other party.
483 * @param sock the client to get the address for
484 * @param addr where to store the address
485 * @param addrlen where to store the length of the address
486 * @return GNUNET_OK on success
489 GNUNET_CONNECTION_get_address (struct GNUNET_CONNECTION_Handle *sock,
490 void **addr, size_t * addrlen)
492 if ((sock->addr == NULL) || (sock->addrlen == 0))
494 *addr = GNUNET_malloc (sock->addrlen);
495 memcpy (*addr, sock->addr, sock->addrlen);
496 *addrlen = sock->addrlen;
502 * This function is called after establishing a connection either has
503 * succeeded or timed out. Note that it is possible that the attempt
504 * timed out and that we're immediately retrying. If we are retrying,
505 * we need to wait again (or timeout); if we succeeded, we need to
506 * wait for data (or timeout).
508 * @param cls our connection handle
509 * @param tc task context describing why we are here
512 receive_again (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
516 * Scheduler let us know that the connect task is finished (or was
517 * cancelled due to shutdown). Now really clean up.
519 * @param cls our "struct GNUNET_CONNECTION_Handle *"
523 destroy_continuation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
525 struct GNUNET_CONNECTION_Handle *sock = cls;
526 GNUNET_CONNECTION_TransmitReadyNotify notify;
527 struct AddressProbe *pos;
529 sock->destroy_task = GNUNET_SCHEDULER_NO_TASK;
530 GNUNET_assert (sock->dns_active == NULL);
531 if (0 != (sock->ccs & COCO_TRANSMIT_READY))
534 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
535 "Destroy waits for CCS-TR to be done (%p)\n", sock);
537 sock->ccs |= COCO_DESTROY_CONTINUATION;
540 if (sock->write_task != GNUNET_SCHEDULER_NO_TASK)
543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
544 "Destroy waits for write_task to be done (%p)\n", sock);
546 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == sock->destroy_task);
548 = GNUNET_SCHEDULER_add_after (sock->write_task,
549 &destroy_continuation, sock);
552 if (0 != (sock->ccs & COCO_RECEIVE_AGAIN))
554 sock->ccs |= COCO_DESTROY_CONTINUATION;
557 if (sock->sock != NULL)
560 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Shutting down socket (%p)\n", sock);
562 if (sock->persist != GNUNET_YES)
564 if ((GNUNET_YES != GNUNET_NETWORK_socket_shutdown (sock->sock, SHUT_RDWR))
565 && (errno != ENOTCONN) && (errno != ECONNRESET))
566 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "shutdown");
569 if (sock->read_task != GNUNET_SCHEDULER_NO_TASK)
571 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == sock->destroy_task);
573 = GNUNET_SCHEDULER_add_after (sock->read_task,
574 &destroy_continuation, sock);
578 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Destroy actually runs (%p)!\n", sock);
580 while (NULL != (pos = sock->ap_head))
582 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (pos->sock));
583 GNUNET_SCHEDULER_cancel (pos->task);
584 GNUNET_CONTAINER_DLL_remove (sock->ap_head, sock->ap_tail, pos);
587 GNUNET_assert (sock->nth.timeout_task == GNUNET_SCHEDULER_NO_TASK);
588 GNUNET_assert (sock->ccs == COCO_NONE);
589 if (NULL != (notify = sock->nth.notify_ready))
591 sock->nth.notify_ready = NULL;
592 notify (sock->nth.notify_ready_cls, 0, NULL);
595 if (sock->sock != NULL)
597 if (sock->persist != GNUNET_YES)
598 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock->sock));
600 GNUNET_free (sock->sock); /* at least no memory leak (we deliberately
601 * leak the socket in this special case) ... */
603 GNUNET_free_non_null (sock->addr);
604 GNUNET_free_non_null (sock->hostname);
605 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == sock->destroy_task);
607 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
608 "Freeing memory of connection %p.\n", sock);
610 GNUNET_free (sock->write_buffer);
617 * See if we are now connected. If not, wait longer for
618 * connect to succeed. If connected, we should be able
619 * to write now as well, unless we timed out.
621 * @param cls our connection handle
622 * @param tc task context describing why we are here
625 transmit_ready (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
629 * We've failed for good to establish a connection.
631 * @param h the connection we tried to establish
634 connect_fail_continuation (struct GNUNET_CONNECTION_Handle *h)
637 GNUNET_log ((0 != strncmp (h->hostname,
640 ? GNUNET_ERROR_TYPE_INFO
641 : GNUNET_ERROR_TYPE_WARNING,
643 ("Failed to establish TCP connection to `%s:%u', no further addresses to try.\n"),
644 h->hostname, h->port);
646 /* connect failed / timed out */
647 GNUNET_break (h->ap_head == NULL);
648 GNUNET_break (h->ap_tail == NULL);
649 GNUNET_break (h->dns_active == GNUNET_NO);
650 GNUNET_break (h->sock == NULL);
652 /* trigger jobs that used to wait on "connect_task" */
653 if (0 != (h->ccs & COCO_RECEIVE_AGAIN))
656 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
657 "connect_fail_continuation triggers receive_again (%p)\n", h);
659 h->ccs -= COCO_RECEIVE_AGAIN;
660 h->read_task = GNUNET_SCHEDULER_add_now (&receive_again, h);
662 if (0 != (h->ccs & COCO_TRANSMIT_READY))
665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
666 "connect_fail_continuation cancels timeout_task, triggers transmit_ready (%p)\n",
669 GNUNET_assert (h->nth.timeout_task != GNUNET_SCHEDULER_NO_TASK);
670 GNUNET_SCHEDULER_cancel (h->nth.timeout_task);
671 h->nth.timeout_task = GNUNET_SCHEDULER_NO_TASK;
672 h->ccs -= COCO_TRANSMIT_READY;
673 GNUNET_assert (h->nth.notify_ready != NULL);
674 GNUNET_assert (h->write_task == GNUNET_SCHEDULER_NO_TASK);
675 h->write_task = GNUNET_SCHEDULER_add_now (&transmit_ready, h);
677 if (0 != (h->ccs & COCO_DESTROY_CONTINUATION))
680 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
681 "connect_fail_continuation runs destroy_continuation (%p)\n",
684 h->ccs -= COCO_DESTROY_CONTINUATION;
685 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == h->destroy_task);
686 h->destroy_task = GNUNET_SCHEDULER_add_now (&destroy_continuation, h);
692 * We've succeeded in establishing a connection.
694 * @param h the connection we tried to establish
697 connect_success_continuation (struct GNUNET_CONNECTION_Handle *h)
700 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
701 "Connection to `%s' succeeded! (%p)\n",
702 GNUNET_a2s (h->addr, h->addrlen), h);
704 /* trigger jobs that waited for the connection */
705 if (0 != (h->ccs & COCO_RECEIVE_AGAIN))
708 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
709 "connect_success_continuation runs receive_again (%p)\n", h);
711 h->ccs -= COCO_RECEIVE_AGAIN;
712 h->read_task = GNUNET_SCHEDULER_add_now (&receive_again, h);
714 if (0 != (h->ccs & COCO_TRANSMIT_READY))
717 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
718 "connect_success_continuation runs transmit_ready, cancels timeout_task (%p)\n",
721 GNUNET_assert (h->nth.timeout_task != GNUNET_SCHEDULER_NO_TASK);
722 GNUNET_SCHEDULER_cancel (h->nth.timeout_task);
723 h->nth.timeout_task = GNUNET_SCHEDULER_NO_TASK;
724 h->ccs -= COCO_TRANSMIT_READY;
725 GNUNET_assert (h->write_task == GNUNET_SCHEDULER_NO_TASK);
726 GNUNET_assert (h->nth.notify_ready != NULL);
728 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_absolute_get_remaining
729 (h->nth.transmit_timeout), h->sock,
732 if (0 != (h->ccs & COCO_DESTROY_CONTINUATION))
735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
736 "connect_success_continuation runs destroy_continuation (%p)\n",
739 h->ccs -= COCO_DESTROY_CONTINUATION;
740 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == h->destroy_task);
741 h->destroy_task = GNUNET_SCHEDULER_add_now (&destroy_continuation, h);
747 * Scheduler let us know that we're either ready to write on the
748 * socket OR connect timed out. Do the right thing.
750 * @param cls the "struct AddressProbe*" with the address that we are probing
751 * @param tc success or failure info about the connect attempt.
754 connect_probe_continuation (void *cls,
755 const struct GNUNET_SCHEDULER_TaskContext *tc)
757 struct AddressProbe *ap = cls;
758 struct GNUNET_CONNECTION_Handle *h = ap->h;
759 struct AddressProbe *pos;
763 GNUNET_assert (ap->sock != NULL);
764 GNUNET_CONTAINER_DLL_remove (h->ap_head, h->ap_tail, ap);
765 len = sizeof (error);
768 if ((0 == (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY)) ||
770 GNUNET_NETWORK_socket_getsockopt (ap->sock, SOL_SOCKET, SO_ERROR,
771 &error, &len)) || (error != 0))
773 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (ap->sock));
775 if ((NULL == h->ap_head) && (h->dns_active == GNUNET_NO))
776 connect_fail_continuation (h);
779 GNUNET_assert (h->sock == NULL);
781 GNUNET_assert (h->addr == NULL);
782 h->addr = GNUNET_malloc (ap->addrlen);
783 memcpy (h->addr, ap->addr, ap->addrlen);
784 h->addrlen = ap->addrlen;
786 /* cancel all other attempts */
787 while (NULL != (pos = h->ap_head))
789 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (pos->sock));
790 GNUNET_SCHEDULER_cancel (pos->task);
791 GNUNET_CONTAINER_DLL_remove (h->ap_head, h->ap_tail, pos);
794 connect_success_continuation (h);
799 * Try to establish a socket connection given the specified address.
800 * This function is called by the resolver once we have a DNS reply.
802 * @param cls our "struct GNUNET_CONNECTION_Handle *"
803 * @param addr address to try, NULL for "last call"
804 * @param addrlen length of addr
807 try_connect_using_address (void *cls,
808 const struct sockaddr *addr, socklen_t addrlen)
810 struct GNUNET_CONNECTION_Handle *h = cls;
811 struct AddressProbe *ap;
812 struct GNUNET_TIME_Relative delay;
816 h->dns_active = NULL;
817 if (NULL == h->ap_head)
818 connect_fail_continuation (h);
822 return; /* already connected */
823 GNUNET_assert (h->addr == NULL);
826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
827 "Trying to connect using address `%s:%u/%s:%u'\n",
828 h->hostname, h->port, GNUNET_a2s (addr, addrlen), h->port);
830 ap = GNUNET_malloc (sizeof (struct AddressProbe) + addrlen);
831 ap->addr = (const struct sockaddr *) &ap[1];
832 memcpy (&ap[1], addr, addrlen);
833 ap->addrlen = addrlen;
836 switch (ap->addr->sa_family)
839 ((struct sockaddr_in *) ap->addr)->sin_port = htons (h->port);
842 ((struct sockaddr_in6 *) ap->addr)->sin6_port = htons (h->port);
847 return; /* not supported by us */
849 ap->sock = GNUNET_NETWORK_socket_create (ap->addr->sa_family, SOCK_STREAM, 0);
850 if (ap->sock == NULL)
853 return; /* not supported by OS */
856 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
857 _("Trying to connect to `%s' (%p)\n"),
858 GNUNET_a2s (ap->addr, ap->addrlen), h);
860 if ((GNUNET_OK != GNUNET_NETWORK_socket_connect (ap->sock,
863 (errno != EINPROGRESS))
865 /* maybe refused / unsupported address, try next */
866 GNUNET_log_strerror (GNUNET_ERROR_TYPE_INFO, "connect");
867 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (ap->sock));
871 GNUNET_CONTAINER_DLL_insert (h->ap_head, h->ap_tail, ap);
872 delay = GNUNET_CONNECTION_CONNECT_RETRY_TIMEOUT;
873 if (h->nth.notify_ready != NULL)
874 delay = GNUNET_TIME_relative_min (delay,
875 GNUNET_TIME_absolute_get_remaining
876 (h->nth.transmit_timeout));
877 if (h->receiver != NULL)
878 delay = GNUNET_TIME_relative_min (delay,
879 GNUNET_TIME_absolute_get_remaining
880 (h->receive_timeout));
882 GNUNET_SCHEDULER_add_write_net (delay, ap->sock,
883 &connect_probe_continuation, ap);
888 * Create a socket handle by (asynchronously) connecting to a host.
889 * This function returns immediately, even if the connection has not
890 * yet been established. This function only creates TCP connections.
892 * @param cfg configuration to use
893 * @param hostname name of the host to connect to
894 * @param port port to connect to
895 * @return the socket handle
897 struct GNUNET_CONNECTION_Handle *
898 GNUNET_CONNECTION_create_from_connect (const struct
899 GNUNET_CONFIGURATION_Handle *cfg,
900 const char *hostname, uint16_t port)
902 struct GNUNET_CONNECTION_Handle *ret;
904 GNUNET_assert (0 < strlen (hostname)); /* sanity check */
905 ret = GNUNET_malloc (sizeof (struct GNUNET_CONNECTION_Handle));
907 ret->write_buffer_size = GNUNET_SERVER_MIN_BUFFER_SIZE;
908 ret->write_buffer = GNUNET_malloc (ret->write_buffer_size);
910 ret->hostname = GNUNET_strdup (hostname);
911 ret->dns_active = GNUNET_RESOLVER_ip_get (ret->hostname,
913 GNUNET_CONNECTION_CONNECT_RETRY_TIMEOUT,
914 &try_connect_using_address, ret);
920 * Create a socket handle by connecting to a UNIX domain service.
921 * This function returns immediately, even if the connection has not
922 * yet been established. This function only creates UNIX connections.
924 * @param cfg configuration to use
925 * @param unixpath path to connect to
926 * @return the socket handle, NULL on systems without UNIX support
928 struct GNUNET_CONNECTION_Handle *
929 GNUNET_CONNECTION_create_from_connect_to_unixpath (const struct
930 GNUNET_CONFIGURATION_Handle
931 *cfg, const char *unixpath)
934 struct GNUNET_CONNECTION_Handle *ret;
935 struct sockaddr_un *un;
938 GNUNET_assert (0 < strlen (unixpath)); /* sanity check */
939 un = GNUNET_malloc (sizeof (struct sockaddr_un));
940 un->sun_family = AF_UNIX;
941 slen = strlen (unixpath);
942 if (slen >= sizeof (un->sun_path))
943 slen = sizeof (un->sun_path) - 1;
944 memcpy (un->sun_path, unixpath, slen);
945 un->sun_path[slen] = '\0';
946 slen = sizeof (struct sockaddr_un);
947 #if HAVE_SOCKADDR_IN_SIN_LEN
948 un->sun_len = (u_char) slen;
951 un->sun_path[0] = '\0';
953 ret = GNUNET_malloc (sizeof (struct GNUNET_CONNECTION_Handle));
955 ret->write_buffer_size = GNUNET_SERVER_MIN_BUFFER_SIZE;
956 ret->write_buffer = GNUNET_malloc (ret->write_buffer_size);
958 ret->hostname = NULL;
959 ret->addr = (struct sockaddr *) un;
961 ret->sock = GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_STREAM, 0);
962 if (NULL == ret->sock)
964 GNUNET_free (ret->addr);
965 GNUNET_free (ret->write_buffer);
969 if (GNUNET_OK != GNUNET_NETWORK_socket_connect (ret->sock,
970 ret->addr, ret->addrlen))
972 /* Just return; we expect everything to work eventually so don't fail HARD */
973 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (ret->sock));
977 connect_success_continuation (ret);
986 * Create a socket handle by (asynchronously) connecting to a host.
987 * This function returns immediately, even if the connection has not
988 * yet been established. This function only creates TCP connections.
990 * @param af_family address family to use
991 * @param serv_addr server address
992 * @param addrlen length of server address
993 * @return the socket handle
995 struct GNUNET_CONNECTION_Handle *
996 GNUNET_CONNECTION_create_from_sockaddr (int af_family,
997 const struct sockaddr *serv_addr,
1000 struct GNUNET_NETWORK_Handle *s;
1001 struct GNUNET_CONNECTION_Handle *ret;
1004 s = GNUNET_NETWORK_socket_create (af_family, SOCK_STREAM, 0);
1007 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING |
1008 GNUNET_ERROR_TYPE_BULK, "socket");
1011 if ((GNUNET_OK != GNUNET_NETWORK_socket_connect (s, serv_addr, addrlen))
1012 && (errno != EINPROGRESS))
1014 /* maybe refused / unsupported address, try next */
1015 GNUNET_log_strerror (GNUNET_ERROR_TYPE_INFO, "connect");
1016 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1017 _("Attempt to connect to `%s' failed\n"),
1018 GNUNET_a2s (serv_addr, addrlen));
1019 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (s));
1022 ret = GNUNET_CONNECTION_create_from_existing (s);
1023 ret->addr = GNUNET_malloc (addrlen);
1024 memcpy (ret->addr, serv_addr, addrlen);
1025 ret->addrlen = addrlen;
1026 #if DEBUG_CONNECTION
1027 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1028 _("Trying to connect to `%s' (%p)\n"),
1029 GNUNET_a2s (serv_addr, addrlen), ret);
1036 * Check if socket is valid (no fatal errors have happened so far).
1037 * Note that a socket that is still trying to connect is considered
1040 * @param sock socket to check
1041 * @return GNUNET_YES if valid, GNUNET_NO otherwise
1044 GNUNET_CONNECTION_check (struct GNUNET_CONNECTION_Handle *sock)
1046 if ((sock->ap_head != NULL) || (sock->dns_active != NULL))
1047 return GNUNET_YES; /* still trying to connect */
1048 return (sock->sock == NULL) ? GNUNET_NO : GNUNET_YES;
1053 * Close the socket and free associated resources. Pending
1054 * transmissions may be completed or dropped depending on the
1055 * arguments. If a receive call is pending and should
1056 * NOT be completed, 'GNUNET_CONNECTION_receive_cancel'
1057 * should be called explicitly first.
1059 * @param sock socket to destroy
1060 * @param finish_pending_write should pending writes be completed or aborted?
1061 * (this applies to transmissions where the data has already been
1062 * read from the application; all other transmissions should be
1063 * aborted using 'GNUNET_CONNECTION_notify_transmit_ready_cancel').
1066 GNUNET_CONNECTION_destroy (struct GNUNET_CONNECTION_Handle *sock,
1067 int finish_pending_write)
1069 if (GNUNET_NO == finish_pending_write)
1071 if (sock->write_task != GNUNET_SCHEDULER_NO_TASK)
1073 GNUNET_SCHEDULER_cancel (sock->write_task);
1074 sock->write_task = GNUNET_SCHEDULER_NO_TASK;
1075 sock->write_buffer_off = 0;
1077 sock->nth.notify_ready = NULL;
1079 if ((sock->write_buffer_off == 0) && (sock->dns_active != NULL))
1081 GNUNET_RESOLVER_request_cancel (sock->dns_active);
1082 sock->dns_active = NULL;
1085 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == sock->destroy_task);
1086 sock->destroy_task = GNUNET_SCHEDULER_add_now (&destroy_continuation, sock);
1091 * Tell the receiver callback that a timeout was reached.
1094 signal_timeout (struct GNUNET_CONNECTION_Handle *sh)
1096 GNUNET_CONNECTION_Receiver receiver;
1098 #if DEBUG_CONNECTION
1099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1100 "Network signals time out to receiver (%p)!\n", sh);
1102 GNUNET_assert (NULL != (receiver = sh->receiver));
1103 sh->receiver = NULL;
1104 receiver (sh->receiver_cls, NULL, 0, NULL, 0, 0);
1109 * Tell the receiver callback that we had an IO error.
1112 signal_error (struct GNUNET_CONNECTION_Handle *sh, int errcode)
1114 GNUNET_CONNECTION_Receiver receiver;
1116 GNUNET_assert (NULL != (receiver = sh->receiver));
1117 sh->receiver = NULL;
1118 receiver (sh->receiver_cls, NULL, 0, sh->addr, sh->addrlen, errcode);
1123 * This function is called once we either timeout
1124 * or have data ready to read.
1127 receive_ready (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1129 struct GNUNET_CONNECTION_Handle *sh = cls;
1130 struct GNUNET_TIME_Absolute now;
1131 char buffer[sh->max];
1133 GNUNET_CONNECTION_Receiver receiver;
1135 sh->read_task = GNUNET_SCHEDULER_NO_TASK;
1136 if ((GNUNET_YES == sh->ignore_shutdown) &&
1137 (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)))
1139 /* ignore shutdown request, go again immediately */
1140 #if DEBUG_CONNECTION
1141 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1142 "Ignoring shutdown signal per configuration\n");
1145 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_absolute_get_remaining
1146 (sh->receive_timeout), sh->sock,
1147 &receive_ready, sh);
1150 now = GNUNET_TIME_absolute_get ();
1151 if ((now.abs_value > sh->receive_timeout.abs_value) ||
1152 (0 != (tc->reason & GNUNET_SCHEDULER_REASON_TIMEOUT)) ||
1153 (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)))
1155 #if DEBUG_CONNECTION
1156 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1157 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1158 "Receive from `%s' encounters error: time out by %llums... (%p)\n",
1159 GNUNET_a2s (sh->addr, sh->addrlen),
1160 GNUNET_TIME_absolute_get_duration (sh->receive_timeout).
1163 signal_timeout (sh);
1166 if (sh->sock == NULL)
1168 /* connect failed for good */
1169 #if DEBUG_CONNECTION
1170 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1171 "Receive encounters error, socket closed... (%p)\n", sh);
1173 signal_error (sh, ECONNREFUSED);
1176 GNUNET_assert (GNUNET_NETWORK_fdset_isset (tc->read_ready, sh->sock));
1178 ret = GNUNET_NETWORK_socket_recv (sh->sock, buffer, sh->max);
1183 #if DEBUG_CONNECTION
1184 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1185 "Error receiving: %s\n", STRERROR (errno));
1187 signal_error (sh, errno);
1190 #if DEBUG_CONNECTION
1191 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1192 "receive_ready read %u/%u bytes from `%s' (%p)!\n",
1194 sh->max, GNUNET_a2s (sh->addr, sh->addrlen), sh);
1196 GNUNET_assert (NULL != (receiver = sh->receiver));
1197 sh->receiver = NULL;
1198 receiver (sh->receiver_cls, buffer, ret, sh->addr, sh->addrlen, 0);
1203 * This function is called after establishing a connection either has
1204 * succeeded or timed out. Note that it is possible that the attempt
1205 * timed out and that we're immediately retrying. If we are retrying,
1206 * we need to wait again (or timeout); if we succeeded, we need to
1207 * wait for data (or timeout).
1209 * @param cls our connection handle
1210 * @param tc task context describing why we are here
1213 receive_again (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1215 struct GNUNET_CONNECTION_Handle *sh = cls;
1216 struct GNUNET_TIME_Absolute now;
1218 sh->read_task = GNUNET_SCHEDULER_NO_TASK;
1219 if (sh->sock == NULL)
1221 /* not connected and no longer trying */
1222 #if DEBUG_CONNECTION
1223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1224 "Receive encounters error, socket closed (%p)...\n", sh);
1226 signal_error (sh, ECONNREFUSED);
1229 now = GNUNET_TIME_absolute_get ();
1230 if ((now.abs_value > sh->receive_timeout.abs_value) ||
1231 (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)))
1233 #if DEBUG_CONNECTION
1234 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1235 "Receive encounters error: time out (%p)...\n", sh);
1237 signal_timeout (sh);
1240 GNUNET_assert (sh->sock != NULL);
1241 /* connect succeeded, wait for data! */
1243 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_absolute_get_remaining
1244 (sh->receive_timeout), sh->sock,
1245 &receive_ready, sh);
1250 * Receive data from the given socket. Note that this function will
1251 * call "receiver" asynchronously using the scheduler. It will
1252 * "immediately" return. Note that there MUST only be one active
1253 * receive call per socket at any given point in time (so do not
1254 * call receive again until the receiver callback has been invoked).
1256 * @param sock socket handle
1257 * @param max maximum number of bytes to read
1258 * @param timeout maximum amount of time to wait (use -1 for "forever")
1259 * @param receiver function to call with received data
1260 * @param receiver_cls closure for receiver
1263 GNUNET_CONNECTION_receive (struct GNUNET_CONNECTION_Handle *sock,
1265 struct GNUNET_TIME_Relative timeout,
1266 GNUNET_CONNECTION_Receiver receiver,
1269 struct GNUNET_SCHEDULER_TaskContext tc;
1271 GNUNET_assert ((sock->read_task == GNUNET_SCHEDULER_NO_TASK) &&
1272 (0 == (sock->ccs & COCO_RECEIVE_AGAIN)) &&
1273 (sock->receiver == NULL));
1274 sock->receiver = receiver;
1275 sock->receiver_cls = receiver_cls;
1276 sock->receive_timeout = GNUNET_TIME_relative_to_absolute (timeout);
1278 if (sock->sock != NULL)
1280 memset (&tc, 0, sizeof (tc));
1281 tc.reason = GNUNET_SCHEDULER_REASON_PREREQ_DONE;
1282 receive_again (sock, &tc);
1285 if ((sock->dns_active == NULL) && (sock->ap_head == NULL))
1287 receiver (receiver_cls, NULL, 0, NULL, 0, ETIMEDOUT);
1290 sock->ccs += COCO_RECEIVE_AGAIN;
1295 * Configure this connection to ignore shutdown signals.
1297 * @param sock socket handle
1298 * @param do_ignore GNUNET_YES to ignore, GNUNET_NO to restore default
1301 GNUNET_CONNECTION_ignore_shutdown (struct GNUNET_CONNECTION_Handle *sock,
1304 sock->ignore_shutdown = do_ignore;
1309 * Cancel receive job on the given socket. Note that the
1310 * receiver callback must not have been called yet in order
1311 * for the cancellation to be valid.
1313 * @param sock socket handle
1314 * @return closure of the original receiver callback closure
1317 GNUNET_CONNECTION_receive_cancel (struct GNUNET_CONNECTION_Handle *sock)
1319 if (sock->read_task != GNUNET_SCHEDULER_NO_TASK)
1321 GNUNET_assert (sock == GNUNET_SCHEDULER_cancel (sock->read_task));
1322 sock->read_task = GNUNET_SCHEDULER_NO_TASK;
1326 GNUNET_assert (0 != (sock->ccs & COCO_RECEIVE_AGAIN));
1327 sock->ccs -= COCO_RECEIVE_AGAIN;
1329 sock->receiver = NULL;
1330 return sock->receiver_cls;
1335 * Try to call the transmit notify method (check if we do
1336 * have enough space available first)!
1338 * @param sock socket for which we should do this processing
1339 * @return GNUNET_YES if we were able to call notify
1342 process_notify (struct GNUNET_CONNECTION_Handle *sock)
1347 GNUNET_CONNECTION_TransmitReadyNotify notify;
1349 GNUNET_assert (sock->write_task == GNUNET_SCHEDULER_NO_TASK);
1350 if (NULL == (notify = sock->nth.notify_ready))
1352 used = sock->write_buffer_off - sock->write_buffer_pos;
1353 avail = sock->write_buffer_size - used;
1354 size = sock->nth.notify_size;
1357 sock->nth.notify_ready = NULL;
1358 if (sock->write_buffer_size - sock->write_buffer_off < size)
1360 /* need to compact */
1361 memmove (sock->write_buffer,
1362 &sock->write_buffer[sock->write_buffer_pos], used);
1363 sock->write_buffer_off -= sock->write_buffer_pos;
1364 sock->write_buffer_pos = 0;
1366 avail = sock->write_buffer_size - sock->write_buffer_off;
1367 GNUNET_assert (avail >= size);
1368 size = notify (sock->nth.notify_ready_cls,
1369 avail, &sock->write_buffer[sock->write_buffer_off]);
1370 GNUNET_assert (size <= avail);
1371 sock->write_buffer_off += size;
1377 * Task invoked by the scheduler when a call to transmit
1378 * is timing out (we never got enough buffer space to call
1379 * the callback function before the specified timeout
1382 * This task notifies the client about the timeout.
1384 * @param cls the 'struct GNUNET_CONNECTION_Handle'
1385 * @param tc scheduler context
1388 transmit_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1390 struct GNUNET_CONNECTION_Handle *sock = cls;
1391 GNUNET_CONNECTION_TransmitReadyNotify notify;
1393 #if DEBUG_CONNECTION
1394 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "transmit_timeout running (%p)\n", sock);
1396 sock->nth.timeout_task = GNUNET_SCHEDULER_NO_TASK;
1397 #if DEBUG_CONNECTION
1398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1399 "Transmit to `%s:%u/%s' fails, time out reached (%p).\n",
1401 sock->port, GNUNET_a2s (sock->addr, sock->addrlen), sock);
1403 GNUNET_assert (0 != (sock->ccs & COCO_TRANSMIT_READY));
1404 sock->ccs -= COCO_TRANSMIT_READY; /* remove request */
1405 notify = sock->nth.notify_ready;
1406 sock->nth.notify_ready = NULL;
1407 notify (sock->nth.notify_ready_cls, 0, NULL);
1412 * Task invoked by the scheduler when we failed to connect
1413 * at the time of being asked to transmit.
1415 * This task notifies the client about the error.
1417 * @param cls the 'struct GNUNET_CONNECTION_Handle'
1418 * @param tc scheduler context
1421 connect_error (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1423 struct GNUNET_CONNECTION_Handle *sock = cls;
1424 GNUNET_CONNECTION_TransmitReadyNotify notify;
1426 #if DEBUG_CONNECTION
1427 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1428 "Transmission request of size %u fails (%s/%u), connection failed (%p).\n",
1429 sock->nth.notify_size, sock->hostname, sock->port, sock);
1431 sock->write_task = GNUNET_SCHEDULER_NO_TASK;
1432 notify = sock->nth.notify_ready;
1433 sock->nth.notify_ready = NULL;
1434 notify (sock->nth.notify_ready_cls, 0, NULL);
1444 transmit_error (struct GNUNET_CONNECTION_Handle *sock)
1446 GNUNET_CONNECTION_TransmitReadyNotify notify;
1448 if (NULL != sock->sock)
1450 GNUNET_NETWORK_socket_shutdown (sock->sock, SHUT_RDWR);
1451 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock->sock));
1454 if (sock->read_task != GNUNET_SCHEDULER_NO_TASK)
1456 GNUNET_SCHEDULER_cancel (sock->read_task);
1457 sock->read_task = GNUNET_SCHEDULER_NO_TASK;
1458 signal_timeout (sock);
1461 if (sock->nth.notify_ready == NULL)
1462 return; /* nobody to tell about it */
1463 notify = sock->nth.notify_ready;
1464 sock->nth.notify_ready = NULL;
1465 notify (sock->nth.notify_ready_cls, 0, NULL);
1470 * See if we are now connected. If not, wait longer for
1471 * connect to succeed. If connected, we should be able
1472 * to write now as well, unless we timed out.
1474 * @param cls our connection handle
1475 * @param tc task context describing why we are here
1478 transmit_ready (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1480 struct GNUNET_CONNECTION_Handle *sock = cls;
1481 GNUNET_CONNECTION_TransmitReadyNotify notify;
1485 #if DEBUG_CONNECTION
1486 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "transmit_ready running (%p).\n", sock);
1488 GNUNET_assert (sock->write_task != GNUNET_SCHEDULER_NO_TASK);
1489 sock->write_task = GNUNET_SCHEDULER_NO_TASK;
1490 GNUNET_assert (sock->nth.timeout_task == GNUNET_SCHEDULER_NO_TASK);
1491 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1493 if (sock->ignore_shutdown == GNUNET_YES)
1494 goto SCHEDULE_WRITE; /* ignore shutdown, go again immediately */
1495 #if DEBUG_CONNECTION
1496 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1497 "Transmit to `%s' fails, shutdown happened (%p).\n",
1498 GNUNET_a2s (sock->addr, sock->addrlen), sock);
1500 notify = sock->nth.notify_ready;
1503 sock->nth.notify_ready = NULL;
1504 notify (sock->nth.notify_ready_cls, 0, NULL);
1508 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_TIMEOUT))
1510 #if DEBUG_CONNECTION
1511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1512 "Transmit to `%s' fails, time out reached (%p).\n",
1513 GNUNET_a2s (sock->addr, sock->addrlen), sock);
1515 notify = sock->nth.notify_ready;
1516 GNUNET_assert (NULL != notify);
1517 sock->nth.notify_ready = NULL;
1518 notify (sock->nth.notify_ready_cls, 0, NULL);
1521 GNUNET_assert (NULL != sock->sock);
1522 if (tc->write_ready == NULL)
1524 /* special circumstances (in particular,
1525 * PREREQ_DONE after connect): not yet ready to write,
1526 * but no "fatal" error either. Hence retry. */
1527 goto SCHEDULE_WRITE;
1529 if (!GNUNET_NETWORK_fdset_isset (tc->write_ready, sock->sock))
1531 #if DEBUG_CONNECTION
1532 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1534 ("Could not satisfy pending transmission request, socket closed or connect failed (%p).\n"),
1537 transmit_error (sock);
1538 return; /* connect failed for good, we're finished */
1540 GNUNET_assert (sock->write_buffer_off >= sock->write_buffer_pos);
1541 if ((sock->nth.notify_ready != NULL) &&
1542 (sock->write_buffer_size < sock->nth.notify_size))
1544 sock->write_buffer = GNUNET_realloc (sock->write_buffer,
1545 sock->nth.notify_size);
1546 sock->write_buffer_size = sock->nth.notify_size;
1548 process_notify (sock);
1549 have = sock->write_buffer_off - sock->write_buffer_pos;
1552 /* no data ready for writing, terminate write loop */
1555 GNUNET_assert (have <= sock->write_buffer_size);
1556 GNUNET_assert (have + sock->write_buffer_pos <= sock->write_buffer_size);
1557 GNUNET_assert (sock->write_buffer_pos <= sock->write_buffer_size);
1559 ret = GNUNET_NETWORK_socket_send (sock->sock,
1560 &sock->write_buffer[sock->write_buffer_pos],
1569 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1570 _("Failed to send to `%s': %s\n"),
1571 GNUNET_a2s (sock->addr, sock->addrlen), STRERROR (en));
1573 #if DEBUG_CONNECTION
1574 GNUNET_log_strerror (GNUNET_ERROR_TYPE_DEBUG, "send");
1576 transmit_error (sock);
1579 #if DEBUG_CONNECTION
1580 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1581 "transmit_ready transmitted %u/%u bytes to `%s' (%p)\n",
1583 have, GNUNET_a2s (sock->addr, sock->addrlen), sock);
1585 sock->write_buffer_pos += ret;
1586 if (sock->write_buffer_pos == sock->write_buffer_off)
1588 /* transmitted all pending data */
1589 sock->write_buffer_pos = 0;
1590 sock->write_buffer_off = 0;
1592 if ((sock->write_buffer_off == 0) && (NULL == sock->nth.notify_ready))
1593 return; /* all data sent! */
1594 /* not done writing, schedule more */
1596 #if DEBUG_CONNECTION
1597 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1598 "Re-scheduling transmit_ready (more to do) (%p).\n", sock);
1600 have = sock->write_buffer_off - sock->write_buffer_pos;
1601 GNUNET_assert ((sock->nth.notify_ready != NULL) || (have > 0));
1602 if (sock->write_task == GNUNET_SCHEDULER_NO_TASK)
1604 GNUNET_SCHEDULER_add_write_net ((sock->nth.notify_ready == NULL)
1605 ? GNUNET_TIME_UNIT_FOREVER_REL
1607 GNUNET_TIME_absolute_get_remaining
1608 (sock->nth.transmit_timeout),
1609 sock->sock, &transmit_ready, sock);
1614 * Ask the socket to call us once the specified number of bytes
1615 * are free in the transmission buffer. May call the notify
1616 * method immediately if enough space is available.
1618 * @param sock socket
1619 * @param size number of bytes to send
1620 * @param timeout after how long should we give up (and call
1621 * notify with buf NULL and size 0)?
1622 * @param notify function to call
1623 * @param notify_cls closure for notify
1624 * @return non-NULL if the notify callback was queued,
1625 * NULL if we are already going to notify someone else (busy)
1627 struct GNUNET_CONNECTION_TransmitHandle *
1628 GNUNET_CONNECTION_notify_transmit_ready (struct GNUNET_CONNECTION_Handle
1630 struct GNUNET_TIME_Relative timeout,
1631 GNUNET_CONNECTION_TransmitReadyNotify
1632 notify, void *notify_cls)
1634 if (sock->nth.notify_ready != NULL)
1639 GNUNET_assert (notify != NULL);
1640 GNUNET_assert (size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
1641 GNUNET_assert (sock->write_buffer_off <= sock->write_buffer_size);
1642 GNUNET_assert (sock->write_buffer_pos <= sock->write_buffer_size);
1643 GNUNET_assert (sock->write_buffer_pos <= sock->write_buffer_off);
1644 sock->nth.notify_ready = notify;
1645 sock->nth.notify_ready_cls = notify_cls;
1646 sock->nth.sh = sock;
1647 sock->nth.notify_size = size;
1648 sock->nth.transmit_timeout = GNUNET_TIME_relative_to_absolute (timeout);
1649 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == sock->nth.timeout_task);
1650 if ((sock->sock == NULL) &&
1651 (sock->ap_head == NULL) && (sock->dns_active == NULL))
1653 if (sock->write_task != GNUNET_SCHEDULER_NO_TASK)
1654 GNUNET_SCHEDULER_cancel (sock->write_task);
1655 sock->write_task = GNUNET_SCHEDULER_add_now (&connect_error, sock);
1658 if (GNUNET_SCHEDULER_NO_TASK != sock->write_task)
1660 if (sock->sock != NULL)
1662 #if DEBUG_CONNECTION
1663 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1664 "Scheduling transmit_ready (%p).\n", sock);
1667 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_absolute_get_remaining
1668 (sock->nth.transmit_timeout),
1669 sock->sock, &transmit_ready, sock);
1673 #if DEBUG_CONNECTION
1674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1675 "CCS-Scheduling transmit_ready, adding timeout task (%p).\n",
1678 sock->ccs |= COCO_TRANSMIT_READY;
1679 sock->nth.timeout_task = GNUNET_SCHEDULER_add_delayed (timeout,
1688 * Cancel the specified transmission-ready notification.
1690 * @param th notification to cancel
1693 GNUNET_CONNECTION_notify_transmit_ready_cancel (struct
1694 GNUNET_CONNECTION_TransmitHandle
1697 GNUNET_assert (h->notify_ready != NULL);
1698 if (0 != (h->sh->ccs & COCO_TRANSMIT_READY))
1700 #if DEBUG_CONNECTION
1701 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1702 "notify_transmit_ready_cancel cancels timeout_task (%p)\n", h);
1704 GNUNET_SCHEDULER_cancel (h->timeout_task);
1705 h->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1706 h->sh->ccs -= COCO_TRANSMIT_READY;
1710 if (h->sh->write_task != GNUNET_SCHEDULER_NO_TASK)
1712 GNUNET_SCHEDULER_cancel (h->sh->write_task);
1713 h->sh->write_task = GNUNET_SCHEDULER_NO_TASK;
1716 h->notify_ready = NULL;
1719 /* end of connection.c */