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-rw-r--r--src/transport/tcp_connection_legacy.c1597
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diff --git a/src/transport/tcp_connection_legacy.c b/src/transport/tcp_connection_legacy.c
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--- a/src/transport/tcp_connection_legacy.c
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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2009-2013 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
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 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20
21/**
22 * @file util/connection.c
23 * @brief TCP connection management
24 * @author Christian Grothoff
25 *
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.
32 */
33#include "platform.h"
34#include "gnunet_util_lib.h"
35#include "gnunet_resolver_service.h"
36
37
38/**
39 * Timeout we use on TCP connect before trying another
40 * result from the DNS resolver. Actual value used
41 * is this value divided by the number of address families.
42 * Default is 5s.
43 */
44#define CONNECT_RETRY_TIMEOUT \
45 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
46
47
48#define LOG_STRERROR(kind, syscall) \
49 GNUNET_log_from_strerror (kind, "util-connection", syscall)
50
51
52/**
53 * Transmission handle. There can only be one for each connection.
54 */
55struct GNUNET_CONNECTION_TransmitHandle
56{
57 /**
58 * Function to call if the send buffer has notify_size
59 * bytes available.
60 */
61 GNUNET_CONNECTION_TransmitReadyNotify notify_ready;
62
63 /**
64 * Closure for notify_ready.
65 */
66 void *notify_ready_cls;
67
68 /**
69 * Our connection handle.
70 */
71 struct GNUNET_CONNECTION_Handle *connection;
72
73 /**
74 * Timeout for receiving (in absolute time).
75 */
76 struct GNUNET_TIME_Absolute transmit_timeout;
77
78 /**
79 * Task called on timeout.
80 */
81 struct GNUNET_SCHEDULER_Task *timeout_task;
82
83 /**
84 * At what number of bytes available in the
85 * write buffer should the notify method be called?
86 */
87 size_t notify_size;
88};
89
90
91/**
92 * During connect, we try multiple possible IP addresses
93 * to find out which one might work.
94 */
95struct AddressProbe
96{
97 /**
98 * This is a linked list.
99 */
100 struct AddressProbe *next;
101
102 /**
103 * This is a doubly-linked list.
104 */
105 struct AddressProbe *prev;
106
107 /**
108 * The address; do not free (allocated at the end of this struct).
109 */
110 const struct sockaddr *addr;
111
112 /**
113 * Underlying OS's socket.
114 */
115 struct GNUNET_NETWORK_Handle *sock;
116
117 /**
118 * Connection for which we are probing.
119 */
120 struct GNUNET_CONNECTION_Handle *connection;
121
122 /**
123 * Length of addr.
124 */
125 socklen_t addrlen;
126
127 /**
128 * Task waiting for the connection to finish connecting.
129 */
130 struct GNUNET_SCHEDULER_Task *task;
131};
132
133
134/**
135 * @brief handle for a network connection
136 */
137struct GNUNET_CONNECTION_Handle
138{
139 /**
140 * Configuration to use.
141 */
142 const struct GNUNET_CONFIGURATION_Handle *cfg;
143
144 /**
145 * Linked list of sockets we are currently trying out
146 * (during connect).
147 */
148 struct AddressProbe *ap_head;
149
150 /**
151 * Linked list of sockets we are currently trying out
152 * (during connect).
153 */
154 struct AddressProbe *ap_tail;
155
156 /**
157 * Network address of the other end-point, may be NULL.
158 */
159 struct sockaddr *addr;
160
161 /**
162 * Pointer to the hostname if connection was
163 * created using DNS lookup, otherwise NULL.
164 */
165 char *hostname;
166
167 /**
168 * Underlying OS's socket, set to NULL after fatal errors.
169 */
170 struct GNUNET_NETWORK_Handle *sock;
171
172 /**
173 * Function to call on data received, NULL if no receive is pending.
174 */
175 GNUNET_CONNECTION_Receiver receiver;
176
177 /**
178 * Closure for @e receiver.
179 */
180 void *receiver_cls;
181
182 /**
183 * Pointer to our write buffer.
184 */
185 char *write_buffer;
186
187 /**
188 * Current size of our @e write_buffer.
189 */
190 size_t write_buffer_size;
191
192 /**
193 * Current write-offset in @e write_buffer (where
194 * would we write next).
195 */
196 size_t write_buffer_off;
197
198 /**
199 * Current read-offset in @e write_buffer (how many
200 * bytes have already been sent).
201 */
202 size_t write_buffer_pos;
203
204 /**
205 * Length of @e addr.
206 */
207 socklen_t addrlen;
208
209 /**
210 * Read task that we may need to wait for.
211 */
212 struct GNUNET_SCHEDULER_Task *read_task;
213
214 /**
215 * Write task that we may need to wait for.
216 */
217 struct GNUNET_SCHEDULER_Task *write_task;
218
219 /**
220 * Handle to a pending DNS lookup request.
221 */
222 struct GNUNET_RESOLVER_RequestHandle *dns_active;
223
224 /**
225 * The handle we return for #GNUNET_CONNECTION_notify_transmit_ready().
226 */
227 struct GNUNET_CONNECTION_TransmitHandle nth;
228
229 /**
230 * Timeout for receiving (in absolute time).
231 */
232 struct GNUNET_TIME_Absolute receive_timeout;
233
234 /**
235 * Maximum number of bytes to read (for receiving).
236 */
237 size_t max;
238
239 /**
240 * Port to connect to.
241 */
242 uint16_t port;
243
244 /**
245 * When shutdown, do not ever actually close the socket, but
246 * free resources. Only should ever be set if using program
247 * termination as a signal (because only then will the leaked
248 * socket be freed!)
249 */
250 int8_t persist;
251
252 /**
253 * Usually 0. Set to 1 if this handle is in use, and should
254 * #GNUNET_CONNECTION_destroy() be called right now, the action needs
255 * to be deferred by setting it to -1.
256 */
257 int8_t destroy_later;
258
259 /**
260 * Handle to subsequent connection after proxy handshake completes,
261 */
262 struct GNUNET_CONNECTION_Handle *proxy_handshake;
263};
264
265
266/**
267 * Set the persist option on this connection handle. Indicates
268 * that the underlying socket or fd should never really be closed.
269 * Used for indicating process death.
270 *
271 * @param connection the connection to set persistent
272 */
273void
274GNUNET_CONNECTION_persist_ (struct GNUNET_CONNECTION_Handle *connection)
275{
276 connection->persist = GNUNET_YES;
277}
278
279
280/**
281 * Disable the "CORK" feature for communication with the given connection,
282 * forcing the OS to immediately flush the buffer on transmission
283 * instead of potentially buffering multiple messages. Essentially
284 * reduces the OS send buffers to zero.
285 * Used to make sure that the last messages sent through the connection
286 * reach the other side before the process is terminated.
287 *
288 * @param connection the connection to make flushing and blocking
289 * @return #GNUNET_OK on success
290 */
291int
292GNUNET_CONNECTION_disable_corking (struct GNUNET_CONNECTION_Handle *connection)
293{
294 return GNUNET_NETWORK_socket_disable_corking (connection->sock);
295}
296
297
298/**
299 * Create a connection handle by boxing an existing OS socket. The OS
300 * socket should henceforth be no longer used directly.
301 * #GNUNET_connection_destroy() will close it.
302 *
303 * @param osSocket existing socket to box
304 * @return the boxed connection handle
305 */
306struct GNUNET_CONNECTION_Handle *
307GNUNET_CONNECTION_create_from_existing (struct GNUNET_NETWORK_Handle *osSocket)
308{
309 struct GNUNET_CONNECTION_Handle *connection;
310
311 connection = GNUNET_new (struct GNUNET_CONNECTION_Handle);
312 connection->write_buffer_size = GNUNET_MIN_MESSAGE_SIZE;
313 connection->write_buffer = GNUNET_malloc (connection->write_buffer_size);
314 connection->sock = osSocket;
315 return connection;
316}
317
318
319/**
320 * Create a connection handle by accepting on a listen socket. This
321 * function may block if the listen socket has no connection ready.
322 *
323 * @param access_cb function to use to check if access is allowed
324 * @param access_cb_cls closure for @a access_cb
325 * @param lsock listen socket
326 * @return the connection handle, NULL on error
327 */
328struct GNUNET_CONNECTION_Handle *
329GNUNET_CONNECTION_create_from_accept (GNUNET_CONNECTION_AccessCheck access_cb,
330 void *access_cb_cls,
331 struct GNUNET_NETWORK_Handle *lsock)
332{
333 struct GNUNET_CONNECTION_Handle *connection;
334 char addr[128];
335 socklen_t addrlen;
336 struct GNUNET_NETWORK_Handle *sock;
337 int aret;
338 struct sockaddr_in *v4;
339 struct sockaddr_in6 *v6;
340 struct sockaddr *sa;
341 void *uaddr;
342
343#ifdef SO_PEERCRED
344 struct ucred uc;
345 socklen_t olen;
346#endif
347 struct GNUNET_CONNECTION_Credentials *gcp;
348#if HAVE_GETPEEREID || defined(SO_PEERCRED) || HAVE_GETPEERUCRED
349 struct GNUNET_CONNECTION_Credentials gc;
350
351 gc.uid = 0;
352 gc.gid = 0;
353#endif
354
355 addrlen = sizeof(addr);
356 sock =
357 GNUNET_NETWORK_socket_accept (lsock, (struct sockaddr *) &addr, &addrlen);
358 if (NULL == sock)
359 {
360 if (EAGAIN != errno)
361 LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING, "accept");
362 return NULL;
363 }
364 if ((addrlen > sizeof(addr)) || (addrlen < sizeof(sa_family_t)))
365 {
366 GNUNET_break (0);
367 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
368 return NULL;
369 }
370
371 sa = (struct sockaddr *) addr;
372 v6 = (struct sockaddr_in6 *) addr;
373 if ((AF_INET6 == sa->sa_family) && (IN6_IS_ADDR_V4MAPPED (&v6->sin6_addr)))
374 {
375 /* convert to V4 address */
376 v4 = GNUNET_new (struct sockaddr_in);
377 memset (v4, 0, sizeof(struct sockaddr_in));
378 v4->sin_family = AF_INET;
379#if HAVE_SOCKADDR_IN_SIN_LEN
380 v4->sin_len = (u_char) sizeof(struct sockaddr_in);
381#endif
382 GNUNET_memcpy (&v4->sin_addr,
383 &((char *) &v6->sin6_addr)[sizeof(struct in6_addr)
384 - sizeof(struct in_addr)],
385 sizeof(struct in_addr));
386 v4->sin_port = v6->sin6_port;
387 uaddr = v4;
388 addrlen = sizeof(struct sockaddr_in);
389 }
390 else
391 {
392 uaddr = GNUNET_malloc (addrlen);
393 GNUNET_memcpy (uaddr, addr, addrlen);
394 }
395 gcp = NULL;
396 if (AF_UNIX == sa->sa_family)
397 {
398#if HAVE_GETPEEREID
399 /* most BSDs */
400 if (0 == getpeereid (GNUNET_NETWORK_get_fd (sock), &gc.uid, &gc.gid))
401 gcp = &gc;
402#else
403#ifdef SO_PEERCRED
404 /* largely traditional GNU/Linux */
405 olen = sizeof(uc);
406 if ((0 == getsockopt (GNUNET_NETWORK_get_fd (sock),
407 SOL_SOCKET,
408 SO_PEERCRED,
409 &uc,
410 &olen)) &&
411 (olen == sizeof(uc)))
412 {
413 gc.uid = uc.uid;
414 gc.gid = uc.gid;
415 gcp = &gc;
416 }
417#else
418#if HAVE_GETPEERUCRED
419 /* this is for Solaris 10 */
420 ucred_t *uc;
421
422 uc = NULL;
423 if (0 == getpeerucred (GNUNET_NETWORK_get_fd (sock), &uc))
424 {
425 gc.uid = ucred_geteuid (uc);
426 gc.gid = ucred_getegid (uc);
427 gcp = &gc;
428 }
429 ucred_free (uc);
430#endif
431#endif
432#endif
433 }
434
435 if ((NULL != access_cb) &&
436 (GNUNET_YES != (aret = access_cb (access_cb_cls, gcp, uaddr, addrlen))))
437 {
438 if (GNUNET_NO == aret)
439 LOG (GNUNET_ERROR_TYPE_INFO,
440 _ ("Access denied to `%s'\n"),
441 GNUNET_a2s (uaddr, addrlen));
442 GNUNET_break (GNUNET_OK ==
443 GNUNET_NETWORK_socket_shutdown (sock, SHUT_RDWR));
444 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
445 GNUNET_free (uaddr);
446 return NULL;
447 }
448 connection = GNUNET_new (struct GNUNET_CONNECTION_Handle);
449 connection->write_buffer_size = GNUNET_MIN_MESSAGE_SIZE;
450 connection->write_buffer = GNUNET_malloc (connection->write_buffer_size);
451 connection->addr = uaddr;
452 connection->addrlen = addrlen;
453 connection->sock = sock;
454 LOG (GNUNET_ERROR_TYPE_INFO,
455 _ ("Accepting connection from `%s': %p\n"),
456 GNUNET_a2s (uaddr, addrlen),
457 connection);
458 return connection;
459}
460
461
462/**
463 * Obtain the network address of the other party.
464 *
465 * @param connection the client to get the address for
466 * @param addr where to store the address
467 * @param addrlen where to store the length of the @a addr
468 * @return #GNUNET_OK on success
469 */
470int
471GNUNET_CONNECTION_get_address (struct GNUNET_CONNECTION_Handle *connection,
472 void **addr,
473 size_t *addrlen)
474{
475 if ((NULL == connection->addr) || (0 == connection->addrlen))
476 return GNUNET_NO;
477 *addr = GNUNET_malloc (connection->addrlen);
478 GNUNET_memcpy (*addr, connection->addr, connection->addrlen);
479 *addrlen = connection->addrlen;
480 return GNUNET_OK;
481}
482
483
484/**
485 * Tell the receiver callback that we had an IO error.
486 *
487 * @param connection connection to signal error
488 * @param errcode error code to send
489 */
490static void
491signal_receive_error (struct GNUNET_CONNECTION_Handle *connection, int errcode)
492{
493 GNUNET_CONNECTION_Receiver receiver;
494
495 LOG (GNUNET_ERROR_TYPE_DEBUG,
496 "Receive encounters error (%s), connection closed (%p)\n",
497 strerror (errcode),
498 connection);
499 GNUNET_assert (NULL != (receiver = connection->receiver));
500 connection->receiver = NULL;
501 receiver (connection->receiver_cls,
502 NULL,
503 0,
504 connection->addr,
505 connection->addrlen,
506 errcode);
507}
508
509
510/**
511 * Tell the receiver callback that a timeout was reached.
512 *
513 * @param connection connection to signal for
514 */
515static void
516signal_receive_timeout (struct GNUNET_CONNECTION_Handle *connection)
517{
518 GNUNET_CONNECTION_Receiver receiver;
519
520 LOG (GNUNET_ERROR_TYPE_DEBUG,
521 "Connection signals timeout to receiver (%p)!\n",
522 connection);
523 GNUNET_assert (NULL != (receiver = connection->receiver));
524 connection->receiver = NULL;
525 receiver (connection->receiver_cls, NULL, 0, NULL, 0, 0);
526}
527
528
529/**
530 * We failed to transmit data to the service, signal the error.
531 *
532 * @param connection handle that had trouble
533 * @param ecode error code (errno)
534 */
535static void
536signal_transmit_error (struct GNUNET_CONNECTION_Handle *connection, int ecode)
537{
538 GNUNET_CONNECTION_TransmitReadyNotify notify;
539
540 LOG (GNUNET_ERROR_TYPE_DEBUG,
541 "Transmission encountered error (%s), connection closed (%p)\n",
542 strerror (ecode),
543 connection);
544 if (NULL != connection->sock)
545 {
546 (void) GNUNET_NETWORK_socket_shutdown (connection->sock, SHUT_RDWR);
547 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (connection->sock));
548 connection->sock = NULL;
549 GNUNET_assert (NULL == connection->write_task);
550 }
551 if (NULL != connection->read_task)
552 {
553 /* send errors trigger read errors... */
554 GNUNET_SCHEDULER_cancel (connection->read_task);
555 connection->read_task = NULL;
556 signal_receive_timeout (connection);
557 return;
558 }
559 if (NULL == connection->nth.notify_ready)
560 return; /* nobody to tell about it */
561 notify = connection->nth.notify_ready;
562 connection->nth.notify_ready = NULL;
563 notify (connection->nth.notify_ready_cls, 0, NULL);
564}
565
566
567/**
568 * We've failed for good to establish a connection (timeout or
569 * no more addresses to try).
570 *
571 * @param connection the connection we tried to establish
572 */
573static void
574connect_fail_continuation (struct GNUNET_CONNECTION_Handle *connection)
575{
576 LOG (GNUNET_ERROR_TYPE_INFO,
577 "Failed to establish TCP connection to `%s:%u', no further addresses to try.\n",
578 connection->hostname,
579 connection->port);
580 GNUNET_break (NULL == connection->ap_head);
581 GNUNET_break (NULL == connection->ap_tail);
582 GNUNET_break (GNUNET_NO == connection->dns_active);
583 GNUNET_break (NULL == connection->sock);
584 GNUNET_assert (NULL == connection->write_task);
585 GNUNET_assert (NULL == connection->proxy_handshake);
586
587 /* signal errors for jobs that used to wait on the connection */
588 connection->destroy_later = 1;
589 if (NULL != connection->receiver)
590 signal_receive_error (connection, ECONNREFUSED);
591 if (NULL != connection->nth.notify_ready)
592 {
593 GNUNET_assert (NULL != connection->nth.timeout_task);
594 GNUNET_SCHEDULER_cancel (connection->nth.timeout_task);
595 connection->nth.timeout_task = NULL;
596 signal_transmit_error (connection, ECONNREFUSED);
597 }
598 if (-1 == connection->destroy_later)
599 {
600 /* do it now */
601 connection->destroy_later = 0;
602 GNUNET_CONNECTION_destroy (connection);
603 return;
604 }
605 connection->destroy_later = 0;
606}
607
608
609/**
610 * We are ready to transmit (or got a timeout).
611 *
612 * @param cls our connection handle
613 */
614static void
615transmit_ready (void *cls);
616
617
618/**
619 * This function is called once we either timeout or have data ready
620 * to read.
621 *
622 * @param cls connection to read from
623 */
624static void
625receive_ready (void *cls);
626
627
628/**
629 * We've succeeded in establishing a connection.
630 *
631 * @param connection the connection we tried to establish
632 */
633static void
634connect_success_continuation (struct GNUNET_CONNECTION_Handle *connection)
635{
636 LOG (GNUNET_ERROR_TYPE_DEBUG,
637 "Connection to `%s' succeeded! (%p)\n",
638 GNUNET_a2s (connection->addr, connection->addrlen),
639 connection);
640 /* trigger jobs that waited for the connection */
641 if (NULL != connection->receiver)
642 {
643 LOG (GNUNET_ERROR_TYPE_DEBUG,
644 "Connection succeeded, starting with receiving data (%p)\n",
645 connection);
646 GNUNET_assert (NULL == connection->read_task);
647 connection->read_task =
648 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_absolute_get_remaining (
649 connection->receive_timeout),
650 connection->sock,
651 &receive_ready,
652 connection);
653 }
654 if (NULL != connection->nth.notify_ready)
655 {
656 LOG (GNUNET_ERROR_TYPE_DEBUG,
657 "Connection succeeded, starting with sending data (%p)\n",
658 connection);
659 GNUNET_assert (connection->nth.timeout_task != NULL);
660 GNUNET_SCHEDULER_cancel (connection->nth.timeout_task);
661 connection->nth.timeout_task = NULL;
662 GNUNET_assert (connection->write_task == NULL);
663 connection->write_task =
664 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_absolute_get_remaining (
665 connection->nth.transmit_timeout),
666 connection->sock,
667 &transmit_ready,
668 connection);
669 }
670}
671
672
673/**
674 * Scheduler let us know that we're either ready to write on the
675 * socket OR connect timed out. Do the right thing.
676 *
677 * @param cls the `struct AddressProbe *` with the address that we are probing
678 */
679static void
680connect_probe_continuation (void *cls)
681{
682 struct AddressProbe *ap = cls;
683 struct GNUNET_CONNECTION_Handle *connection = ap->connection;
684 const struct GNUNET_SCHEDULER_TaskContext *tc;
685 struct AddressProbe *pos;
686 int error;
687 socklen_t len;
688
689 GNUNET_assert (NULL != ap->sock);
690 GNUNET_CONTAINER_DLL_remove (connection->ap_head, connection->ap_tail, ap);
691 len = sizeof(error);
692 errno = 0;
693 error = 0;
694 tc = GNUNET_SCHEDULER_get_task_context ();
695 if ((0 == (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY)) ||
696 (GNUNET_OK != GNUNET_NETWORK_socket_getsockopt (ap->sock,
697 SOL_SOCKET,
698 SO_ERROR,
699 &error,
700 &len)) ||
701 (0 != error))
702 {
703 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (ap->sock));
704 GNUNET_free (ap);
705 if ((NULL == connection->ap_head) &&
706 (GNUNET_NO == connection->dns_active) &&
707 (NULL == connection->proxy_handshake))
708 connect_fail_continuation (connection);
709 return;
710 }
711 GNUNET_assert (NULL == connection->sock);
712 connection->sock = ap->sock;
713 GNUNET_assert (NULL == connection->addr);
714 connection->addr = GNUNET_malloc (ap->addrlen);
715 GNUNET_memcpy (connection->addr, ap->addr, ap->addrlen);
716 connection->addrlen = ap->addrlen;
717 GNUNET_free (ap);
718 /* cancel all other attempts */
719 while (NULL != (pos = connection->ap_head))
720 {
721 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (pos->sock));
722 GNUNET_SCHEDULER_cancel (pos->task);
723 GNUNET_CONTAINER_DLL_remove (connection->ap_head, connection->ap_tail, pos);
724 GNUNET_free (pos);
725 }
726 connect_success_continuation (connection);
727}
728
729
730/**
731 * Try to establish a connection given the specified address.
732 * This function is called by the resolver once we have a DNS reply.
733 *
734 * @param cls our `struct GNUNET_CONNECTION_Handle *`
735 * @param addr address to try, NULL for "last call"
736 * @param addrlen length of @a addr
737 */
738static void
739try_connect_using_address (void *cls,
740 const struct sockaddr *addr,
741 socklen_t addrlen)
742{
743 struct GNUNET_CONNECTION_Handle *connection = cls;
744 struct AddressProbe *ap;
745 struct GNUNET_TIME_Relative delay;
746
747 if (NULL == addr)
748 {
749 connection->dns_active = NULL;
750 if ((NULL == connection->ap_head) && (NULL == connection->sock) &&
751 (NULL == connection->proxy_handshake))
752 connect_fail_continuation (connection);
753 return;
754 }
755 if (NULL != connection->sock)
756 return; /* already connected */
757 GNUNET_assert (NULL == connection->addr);
758 /* try to connect */
759 LOG (GNUNET_ERROR_TYPE_DEBUG,
760 "Trying to connect using address `%s:%u/%s:%u'\n",
761 connection->hostname,
762 connection->port,
763 GNUNET_a2s (addr, addrlen),
764 connection->port);
765 ap = GNUNET_malloc (sizeof(struct AddressProbe) + addrlen);
766 ap->addr = (const struct sockaddr *) &ap[1];
767 GNUNET_memcpy (&ap[1], addr, addrlen);
768 ap->addrlen = addrlen;
769 ap->connection = connection;
770
771 switch (ap->addr->sa_family)
772 {
773 case AF_INET:
774 ((struct sockaddr_in *) ap->addr)->sin_port = htons (connection->port);
775 break;
776
777 case AF_INET6:
778 ((struct sockaddr_in6 *) ap->addr)->sin6_port = htons (connection->port);
779 break;
780
781 default:
782 GNUNET_break (0);
783 GNUNET_free (ap);
784 return; /* not supported by us */
785 }
786 ap->sock = GNUNET_NETWORK_socket_create (ap->addr->sa_family, SOCK_STREAM, 0);
787 if (NULL == ap->sock)
788 {
789 GNUNET_free (ap);
790 return; /* not supported by OS */
791 }
792 LOG (GNUNET_ERROR_TYPE_INFO,
793 "Trying to connect to `%s' (%p)\n",
794 GNUNET_a2s (ap->addr, ap->addrlen),
795 connection);
796 if ((GNUNET_OK !=
797 GNUNET_NETWORK_socket_connect (ap->sock, ap->addr, ap->addrlen)) &&
798 (EINPROGRESS != errno))
799 {
800 /* maybe refused / unsupported address, try next */
801 LOG_STRERROR (GNUNET_ERROR_TYPE_INFO, "connect");
802 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (ap->sock));
803 GNUNET_free (ap);
804 return;
805 }
806 GNUNET_CONTAINER_DLL_insert (connection->ap_head, connection->ap_tail, ap);
807 delay = CONNECT_RETRY_TIMEOUT;
808 if (NULL != connection->nth.notify_ready)
809 delay = GNUNET_TIME_relative_min (delay,
810 GNUNET_TIME_absolute_get_remaining (
811 connection->nth.transmit_timeout));
812 if (NULL != connection->receiver)
813 delay = GNUNET_TIME_relative_min (delay,
814 GNUNET_TIME_absolute_get_remaining (
815 connection->receive_timeout));
816 ap->task = GNUNET_SCHEDULER_add_write_net (delay,
817 ap->sock,
818 &connect_probe_continuation,
819 ap);
820}
821
822
823/**
824 * Create a connection handle by (asynchronously) connecting to a host.
825 * This function returns immediately, even if the connection has not
826 * yet been established. This function only creates TCP connections.
827 *
828 * @param cfg configuration to use
829 * @param hostname name of the host to connect to
830 * @param port port to connect to
831 * @return the connection handle
832 */
833struct GNUNET_CONNECTION_Handle *
834GNUNET_CONNECTION_create_from_connect (
835 const struct GNUNET_CONFIGURATION_Handle *cfg,
836 const char *hostname,
837 uint16_t port)
838{
839 struct GNUNET_CONNECTION_Handle *connection;
840
841 GNUNET_assert (0 < strlen (hostname)); /* sanity check */
842 connection = GNUNET_new (struct GNUNET_CONNECTION_Handle);
843 connection->cfg = cfg;
844 connection->write_buffer_size = GNUNET_MIN_MESSAGE_SIZE;
845 connection->write_buffer = GNUNET_malloc (connection->write_buffer_size);
846 connection->port = port;
847 connection->hostname = GNUNET_strdup (hostname);
848 connection->dns_active = GNUNET_RESOLVER_ip_get (connection->hostname,
849 AF_UNSPEC,
850 CONNECT_RETRY_TIMEOUT,
851 &try_connect_using_address,
852 connection);
853 return connection;
854}
855
856
857/**
858 * Create a connection handle by connecting to a UNIX domain service.
859 * This function returns immediately, even if the connection has not
860 * yet been established. This function only creates UNIX connections.
861 *
862 * @param cfg configuration to use
863 * @param unixpath path to connect to
864 * @return the connection handle, NULL on systems without UNIX support
865 */
866struct GNUNET_CONNECTION_Handle *
867GNUNET_CONNECTION_create_from_connect_to_unixpath (
868 const struct GNUNET_CONFIGURATION_Handle *cfg,
869 const char *unixpath)
870{
871#ifdef AF_UNIX
872 struct GNUNET_CONNECTION_Handle *connection;
873 struct sockaddr_un *un;
874
875 GNUNET_assert (0 < strlen (unixpath)); /* sanity check */
876 un = GNUNET_new (struct sockaddr_un);
877 un->sun_family = AF_UNIX;
878 GNUNET_strlcpy (un->sun_path, unixpath, sizeof(un->sun_path));
879#ifdef __linux__
880 {
881 int abstract;
882
883 abstract = GNUNET_CONFIGURATION_get_value_yesno (cfg,
884 "TESTING",
885 "USE_ABSTRACT_SOCKETS");
886 if (GNUNET_YES == abstract)
887 un->sun_path[0] = '\0';
888 }
889#endif
890#if HAVE_SOCKADDR_UN_SUN_LEN
891 un->sun_len = (u_char) sizeof(struct sockaddr_un);
892#endif
893 connection = GNUNET_new (struct GNUNET_CONNECTION_Handle);
894 connection->cfg = cfg;
895 connection->write_buffer_size = GNUNET_MIN_MESSAGE_SIZE;
896 connection->write_buffer = GNUNET_malloc (connection->write_buffer_size);
897 connection->port = 0;
898 connection->hostname = NULL;
899 connection->addr = (struct sockaddr *) un;
900 connection->addrlen = sizeof(struct sockaddr_un);
901 connection->sock = GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_STREAM, 0);
902 if (NULL == connection->sock)
903 {
904 GNUNET_free (connection->addr);
905 GNUNET_free (connection->write_buffer);
906 GNUNET_free (connection);
907 return NULL;
908 }
909 if ((GNUNET_OK != GNUNET_NETWORK_socket_connect (connection->sock,
910 connection->addr,
911 connection->addrlen)) &&
912 (EINPROGRESS != errno))
913 {
914 /* Just return; we expect everything to work eventually so don't fail HARD */
915 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (connection->sock));
916 connection->sock = NULL;
917 return connection;
918 }
919 connect_success_continuation (connection);
920 return connection;
921#else
922 return NULL;
923#endif
924}
925
926
927/**
928 * Create a connection handle by (asynchronously) connecting to a host.
929 * This function returns immediately, even if the connection has not
930 * yet been established. This function only creates TCP connections.
931 *
932 * @param s socket to connect
933 * @param serv_addr server address
934 * @param addrlen length of @a serv_addr
935 * @return the connection handle
936 */
937struct GNUNET_CONNECTION_Handle *
938GNUNET_CONNECTION_connect_socket (struct GNUNET_NETWORK_Handle *s,
939 const struct sockaddr *serv_addr,
940 socklen_t addrlen)
941{
942 struct GNUNET_CONNECTION_Handle *connection;
943
944 if ((GNUNET_OK != GNUNET_NETWORK_socket_connect (s, serv_addr, addrlen)) &&
945 (EINPROGRESS != errno))
946 {
947 /* maybe refused / unsupported address, try next */
948 LOG_STRERROR (GNUNET_ERROR_TYPE_DEBUG, "connect");
949 LOG (GNUNET_ERROR_TYPE_DEBUG,
950 "Attempt to connect to `%s' failed\n",
951 GNUNET_a2s (serv_addr, addrlen));
952 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (s));
953 return NULL;
954 }
955 connection = GNUNET_CONNECTION_create_from_existing (s);
956 connection->addr = GNUNET_malloc (addrlen);
957 GNUNET_memcpy (connection->addr, serv_addr, addrlen);
958 connection->addrlen = addrlen;
959 LOG (GNUNET_ERROR_TYPE_INFO,
960 "Trying to connect to `%s' (%p)\n",
961 GNUNET_a2s (serv_addr, addrlen),
962 connection);
963 return connection;
964}
965
966
967/**
968 * Create a connection handle by creating a socket and
969 * (asynchronously) connecting to a host. This function returns
970 * immediately, even if the connection has not yet been established.
971 * This function only creates TCP connections.
972 *
973 * @param af_family address family to use
974 * @param serv_addr server address
975 * @param addrlen length of @a serv_addr
976 * @return the connection handle
977 */
978struct GNUNET_CONNECTION_Handle *
979GNUNET_CONNECTION_create_from_sockaddr (int af_family,
980 const struct sockaddr *serv_addr,
981 socklen_t addrlen)
982{
983 struct GNUNET_NETWORK_Handle *s;
984
985 s = GNUNET_NETWORK_socket_create (af_family, SOCK_STREAM, 0);
986 if (NULL == s)
987 {
988 LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK, "socket");
989 return NULL;
990 }
991 return GNUNET_CONNECTION_connect_socket (s, serv_addr, addrlen);
992}
993
994
995/**
996 * Check if connection is valid (no fatal errors have happened so far).
997 * Note that a connection that is still trying to connect is considered
998 * valid.
999 *
1000 * @param connection connection to check
1001 * @return #GNUNET_YES if valid, #GNUNET_NO otherwise
1002 */
1003int
1004GNUNET_CONNECTION_check (struct GNUNET_CONNECTION_Handle *connection)
1005{
1006 if ((NULL != connection->ap_head) || (NULL != connection->dns_active) ||
1007 (NULL != connection->proxy_handshake))
1008 return GNUNET_YES; /* still trying to connect */
1009 if ((0 != connection->destroy_later) || (NULL == connection->sock))
1010 return GNUNET_NO;
1011 return GNUNET_YES;
1012}
1013
1014
1015/**
1016 * Close the connection and free associated resources. There must
1017 * not be any pending requests for reading or writing to the
1018 * connection at this time.
1019 *
1020 * @param connection connection to destroy
1021 */
1022void
1023GNUNET_CONNECTION_destroy (struct GNUNET_CONNECTION_Handle *connection)
1024{
1025 struct AddressProbe *pos;
1026
1027 if (0 != connection->destroy_later)
1028 {
1029 connection->destroy_later = -1;
1030 return;
1031 }
1032 LOG (GNUNET_ERROR_TYPE_DEBUG, "Shutting down connection (%p)\n", connection);
1033 GNUNET_assert (NULL == connection->nth.notify_ready);
1034 GNUNET_assert (NULL == connection->receiver);
1035 if (NULL != connection->write_task)
1036 {
1037 GNUNET_SCHEDULER_cancel (connection->write_task);
1038 connection->write_task = NULL;
1039 connection->write_buffer_off = 0;
1040 }
1041 if (NULL != connection->read_task)
1042 {
1043 GNUNET_SCHEDULER_cancel (connection->read_task);
1044 connection->read_task = NULL;
1045 }
1046 if (NULL != connection->nth.timeout_task)
1047 {
1048 GNUNET_SCHEDULER_cancel (connection->nth.timeout_task);
1049 connection->nth.timeout_task = NULL;
1050 }
1051 connection->nth.notify_ready = NULL;
1052 if (NULL != connection->dns_active)
1053 {
1054 GNUNET_RESOLVER_request_cancel (connection->dns_active);
1055 connection->dns_active = NULL;
1056 }
1057 if (NULL != connection->proxy_handshake)
1058 {
1059 /* GNUNET_CONNECTION_destroy (connection->proxy_handshake); */
1060 connection->proxy_handshake->destroy_later = -1;
1061 connection->proxy_handshake = NULL; /* Not leaked ??? */
1062 }
1063 while (NULL != (pos = connection->ap_head))
1064 {
1065 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (pos->sock));
1066 GNUNET_SCHEDULER_cancel (pos->task);
1067 GNUNET_CONTAINER_DLL_remove (connection->ap_head, connection->ap_tail, pos);
1068 GNUNET_free (pos);
1069 }
1070 if ((NULL != connection->sock) && (GNUNET_YES != connection->persist))
1071 {
1072 if ((GNUNET_OK !=
1073 GNUNET_NETWORK_socket_shutdown (connection->sock, SHUT_RDWR)) &&
1074 (ENOTCONN != errno) && (ECONNRESET != errno))
1075 LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING, "shutdown");
1076 }
1077 if (NULL != connection->sock)
1078 {
1079 if (GNUNET_YES != connection->persist)
1080 {
1081 GNUNET_break (GNUNET_OK ==
1082 GNUNET_NETWORK_socket_close (connection->sock));
1083 }
1084 else
1085 {
1086 GNUNET_NETWORK_socket_free_memory_only_ (
1087 connection->sock); /* at least no memory leak (we deliberately
1088 * leak the socket in this special case) ... */
1089 }
1090 }
1091 GNUNET_free (connection->addr);
1092 GNUNET_free (connection->hostname);
1093 GNUNET_free (connection->write_buffer);
1094 GNUNET_free (connection);
1095}
1096
1097
1098/**
1099 * This function is called once we either timeout
1100 * or have data ready to read.
1101 *
1102 * @param cls connection to read from
1103 */
1104static void
1105receive_ready (void *cls)
1106{
1107 struct GNUNET_CONNECTION_Handle *connection = cls;
1108 const struct GNUNET_SCHEDULER_TaskContext *tc;
1109 char buffer[connection->max];
1110 ssize_t ret;
1111 GNUNET_CONNECTION_Receiver receiver;
1112
1113 connection->read_task = NULL;
1114 tc = GNUNET_SCHEDULER_get_task_context ();
1115 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_TIMEOUT))
1116 {
1117 LOG (GNUNET_ERROR_TYPE_DEBUG,
1118 "Receive from `%s' encounters error: timeout (%s, %p)\n",
1119 GNUNET_a2s (connection->addr, connection->addrlen),
1120 GNUNET_STRINGS_relative_time_to_string (
1121 GNUNET_TIME_absolute_get_duration (
1122 connection->receive_timeout),
1123 GNUNET_YES),
1124 connection);
1125 signal_receive_timeout (connection);
1126 return;
1127 }
1128 if (NULL == connection->sock)
1129 {
1130 /* connect failed for good */
1131 signal_receive_error (connection, ECONNREFUSED);
1132 return;
1133 }
1134 GNUNET_assert (GNUNET_NETWORK_fdset_isset (tc->read_ready, connection->sock));
1135RETRY:
1136 ret = GNUNET_NETWORK_socket_recv (connection->sock, buffer, connection->max);
1137 if (-1 == ret)
1138 {
1139 if (EINTR == errno)
1140 goto RETRY;
1141 signal_receive_error (connection, errno);
1142 return;
1143 }
1144 LOG (GNUNET_ERROR_TYPE_DEBUG,
1145 "receive_ready read %lu/%lu bytes from `%s' (%p)!\n",
1146 (unsigned long) ret,
1147 (unsigned long) connection->max,
1148 GNUNET_a2s (connection->addr, connection->addrlen),
1149 connection);
1150 GNUNET_assert (NULL != (receiver = connection->receiver));
1151 connection->receiver = NULL;
1152 receiver (connection->receiver_cls,
1153 buffer,
1154 ret,
1155 connection->addr,
1156 connection->addrlen,
1157 0);
1158}
1159
1160
1161/**
1162 * Receive data from the given connection. Note that this function
1163 * will call @a receiver asynchronously using the scheduler. It will
1164 * "immediately" return. Note that there MUST only be one active
1165 * receive call per connection at any given point in time (so do not
1166 * call receive again until the receiver callback has been invoked).
1167 *
1168 * @param connection connection handle
1169 * @param max maximum number of bytes to read
1170 * @param timeout maximum amount of time to wait
1171 * @param receiver function to call with received data
1172 * @param receiver_cls closure for @a receiver
1173 * @return #GNUNET_SYSERR if @a connection died (receiver was
1174 * called with error)
1175 */
1176int
1177GNUNET_CONNECTION_receive (struct GNUNET_CONNECTION_Handle *connection,
1178 size_t max,
1179 struct GNUNET_TIME_Relative timeout,
1180 GNUNET_CONNECTION_Receiver receiver,
1181 void *receiver_cls)
1182{
1183 GNUNET_assert ((NULL == connection->read_task) &&
1184 (NULL == connection->receiver));
1185 GNUNET_assert (NULL != receiver);
1186 connection->receiver = receiver;
1187 connection->receiver_cls = receiver_cls;
1188 connection->receive_timeout = GNUNET_TIME_relative_to_absolute (timeout);
1189 connection->max = max;
1190 if (NULL != connection->sock)
1191 {
1192 connection->read_task =
1193 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_absolute_get_remaining (
1194 connection->receive_timeout),
1195 connection->sock,
1196 &receive_ready,
1197 connection);
1198 return GNUNET_OK;
1199 }
1200 if ((NULL == connection->dns_active) && (NULL == connection->ap_head) &&
1201 (NULL == connection->proxy_handshake))
1202 {
1203 connection->receiver = NULL;
1204 receiver (receiver_cls, NULL, 0, NULL, 0, ETIMEDOUT);
1205 return GNUNET_SYSERR;
1206 }
1207 return GNUNET_OK;
1208}
1209
1210
1211/**
1212 * Cancel receive job on the given connection. Note that the
1213 * receiver callback must not have been called yet in order
1214 * for the cancellation to be valid.
1215 *
1216 * @param connection connection handle
1217 * @return closure of the original receiver callback closure
1218 */
1219void *
1220GNUNET_CONNECTION_receive_cancel (struct GNUNET_CONNECTION_Handle *connection)
1221{
1222 if (NULL != connection->read_task)
1223 {
1224 GNUNET_assert (connection ==
1225 GNUNET_SCHEDULER_cancel (connection->read_task));
1226 connection->read_task = NULL;
1227 }
1228 connection->receiver = NULL;
1229 return connection->receiver_cls;
1230}
1231
1232
1233/**
1234 * Try to call the transmit notify method (check if we do
1235 * have enough space available first)!
1236 *
1237 * @param connection connection for which we should do this processing
1238 * @return #GNUNET_YES if we were able to call notify
1239 */
1240static int
1241process_notify (struct GNUNET_CONNECTION_Handle *connection)
1242{
1243 size_t used;
1244 size_t avail;
1245 size_t size;
1246 GNUNET_CONNECTION_TransmitReadyNotify notify;
1247
1248 LOG (GNUNET_ERROR_TYPE_DEBUG, "process_notify is running\n");
1249 GNUNET_assert (NULL == connection->write_task);
1250 if (NULL == (notify = connection->nth.notify_ready))
1251 {
1252 LOG (GNUNET_ERROR_TYPE_DEBUG, "No one to notify\n");
1253 return GNUNET_NO;
1254 }
1255 used = connection->write_buffer_off - connection->write_buffer_pos;
1256 avail = connection->write_buffer_size - used;
1257 size = connection->nth.notify_size;
1258 if (size > avail)
1259 {
1260 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not enough buffer\n");
1261 return GNUNET_NO;
1262 }
1263 connection->nth.notify_ready = NULL;
1264 if (connection->write_buffer_size - connection->write_buffer_off < size)
1265 {
1266 /* need to compact */
1267 memmove (connection->write_buffer,
1268 &connection->write_buffer[connection->write_buffer_pos],
1269 used);
1270 connection->write_buffer_off -= connection->write_buffer_pos;
1271 connection->write_buffer_pos = 0;
1272 }
1273 avail = connection->write_buffer_size - connection->write_buffer_off;
1274 GNUNET_assert (avail >= size);
1275 size = notify (connection->nth.notify_ready_cls,
1276 avail,
1277 &connection->write_buffer[connection->write_buffer_off]);
1278 GNUNET_assert (size <= avail);
1279 if (0 != size)
1280 connection->write_buffer_off += size;
1281 return GNUNET_YES;
1282}
1283
1284
1285/**
1286 * Task invoked by the scheduler when a call to transmit
1287 * is timing out (we never got enough buffer space to call
1288 * the callback function before the specified timeout
1289 * expired).
1290 *
1291 * This task notifies the client about the timeout.
1292 *
1293 * @param cls the `struct GNUNET_CONNECTION_Handle`
1294 */
1295static void
1296transmit_timeout (void *cls)
1297{
1298 struct GNUNET_CONNECTION_Handle *connection = cls;
1299 GNUNET_CONNECTION_TransmitReadyNotify notify;
1300
1301 connection->nth.timeout_task = NULL;
1302 LOG (GNUNET_ERROR_TYPE_DEBUG,
1303 "Transmit to `%s:%u/%s' fails, time out reached (%p).\n",
1304 connection->hostname,
1305 connection->port,
1306 GNUNET_a2s (connection->addr, connection->addrlen),
1307 connection);
1308 notify = connection->nth.notify_ready;
1309 GNUNET_assert (NULL != notify);
1310 connection->nth.notify_ready = NULL;
1311 notify (connection->nth.notify_ready_cls, 0, NULL);
1312}
1313
1314
1315/**
1316 * Task invoked by the scheduler when we failed to connect
1317 * at the time of being asked to transmit.
1318 *
1319 * This task notifies the client about the error.
1320 *
1321 * @param cls the `struct GNUNET_CONNECTION_Handle`
1322 */
1323static void
1324connect_error (void *cls)
1325{
1326 struct GNUNET_CONNECTION_Handle *connection = cls;
1327 GNUNET_CONNECTION_TransmitReadyNotify notify;
1328
1329 LOG (GNUNET_ERROR_TYPE_DEBUG,
1330 "Transmission request of size %lu fails (%s/%u), connection failed (%p).\n",
1331 (unsigned long) connection->nth.notify_size,
1332 connection->hostname,
1333 connection->port,
1334 connection);
1335 connection->write_task = NULL;
1336 notify = connection->nth.notify_ready;
1337 connection->nth.notify_ready = NULL;
1338 notify (connection->nth.notify_ready_cls, 0, NULL);
1339}
1340
1341
1342/**
1343 * We are ready to transmit (or got a timeout).
1344 *
1345 * @param cls our connection handle
1346 */
1347static void
1348transmit_ready (void *cls)
1349{
1350 struct GNUNET_CONNECTION_Handle *connection = cls;
1351 GNUNET_CONNECTION_TransmitReadyNotify notify;
1352 const struct GNUNET_SCHEDULER_TaskContext *tc;
1353 ssize_t ret;
1354 size_t have;
1355
1356 LOG (GNUNET_ERROR_TYPE_DEBUG, "transmit_ready running (%p).\n", connection);
1357 GNUNET_assert (NULL != connection->write_task);
1358 connection->write_task = NULL;
1359 GNUNET_assert (NULL == connection->nth.timeout_task);
1360 tc = GNUNET_SCHEDULER_get_task_context ();
1361 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_TIMEOUT))
1362 {
1363 LOG (GNUNET_ERROR_TYPE_DEBUG,
1364 "Transmit to `%s' fails, time out reached (%p).\n",
1365 GNUNET_a2s (connection->addr, connection->addrlen),
1366 connection);
1367 notify = connection->nth.notify_ready;
1368 GNUNET_assert (NULL != notify);
1369 connection->nth.notify_ready = NULL;
1370 notify (connection->nth.notify_ready_cls, 0, NULL);
1371 return;
1372 }
1373 GNUNET_assert (NULL != connection->sock);
1374 if (NULL == tc->write_ready)
1375 {
1376 /* special circumstances (in particular, PREREQ_DONE after
1377 * connect): not yet ready to write, but no "fatal" error either.
1378 * Hence retry. */
1379 goto SCHEDULE_WRITE;
1380 }
1381 if (! GNUNET_NETWORK_fdset_isset (tc->write_ready, connection->sock))
1382 {
1383 GNUNET_assert (NULL == connection->write_task);
1384 /* special circumstances (in particular, shutdown): not yet ready
1385 * to write, but no "fatal" error either. Hence retry. */
1386 goto SCHEDULE_WRITE;
1387 }
1388 GNUNET_assert (connection->write_buffer_off >= connection->write_buffer_pos);
1389 if ((NULL != connection->nth.notify_ready) &&
1390 (connection->write_buffer_size < connection->nth.notify_size))
1391 {
1392 connection->write_buffer =
1393 GNUNET_realloc (connection->write_buffer, connection->nth.notify_size);
1394 connection->write_buffer_size = connection->nth.notify_size;
1395 }
1396 process_notify (connection);
1397 have = connection->write_buffer_off - connection->write_buffer_pos;
1398 if (0 == have)
1399 {
1400 /* no data ready for writing, terminate write loop */
1401 return;
1402 }
1403 GNUNET_assert (have <= connection->write_buffer_size);
1404 GNUNET_assert (have + connection->write_buffer_pos <=
1405 connection->write_buffer_size);
1406 GNUNET_assert (connection->write_buffer_pos <= connection->write_buffer_size);
1407RETRY:
1408 ret =
1409 GNUNET_NETWORK_socket_send (connection->sock,
1410 &connection
1411 ->write_buffer[connection->write_buffer_pos],
1412 have);
1413 if (-1 == ret)
1414 {
1415 if (EINTR == errno)
1416 goto RETRY;
1417 if (NULL != connection->write_task)
1418 {
1419 GNUNET_SCHEDULER_cancel (connection->write_task);
1420 connection->write_task = NULL;
1421 }
1422 signal_transmit_error (connection, errno);
1423 return;
1424 }
1425 LOG (GNUNET_ERROR_TYPE_DEBUG,
1426 "Connection transmitted %lu/%lu bytes to `%s' (%p)\n",
1427 (unsigned long) ret,
1428 (unsigned long) have,
1429 GNUNET_a2s (connection->addr, connection->addrlen),
1430 connection);
1431 connection->write_buffer_pos += ret;
1432 if (connection->write_buffer_pos == connection->write_buffer_off)
1433 {
1434 /* transmitted all pending data */
1435 connection->write_buffer_pos = 0;
1436 connection->write_buffer_off = 0;
1437 }
1438 if ((0 == connection->write_buffer_off) &&
1439 (NULL == connection->nth.notify_ready))
1440 return; /* all data sent! */
1441 /* not done writing, schedule more */
1442SCHEDULE_WRITE:
1443 LOG (GNUNET_ERROR_TYPE_DEBUG,
1444 "Re-scheduling transmit_ready (more to do) (%p).\n",
1445 connection);
1446 have = connection->write_buffer_off - connection->write_buffer_pos;
1447 GNUNET_assert ((NULL != connection->nth.notify_ready) || (have > 0));
1448 if (NULL == connection->write_task)
1449 connection->write_task =
1450 GNUNET_SCHEDULER_add_write_net ((connection->nth.notify_ready == NULL)
1451 ? GNUNET_TIME_UNIT_FOREVER_REL
1452 : GNUNET_TIME_absolute_get_remaining (
1453 connection->nth.transmit_timeout),
1454 connection->sock,
1455 &transmit_ready,
1456 connection);
1457}
1458
1459
1460/**
1461 * Ask the connection to call us once the specified number of bytes
1462 * are free in the transmission buffer. Will never call the @a notify
1463 * callback in this task, but always first go into the scheduler.
1464 *
1465 * @param connection connection
1466 * @param size number of bytes to send
1467 * @param timeout after how long should we give up (and call
1468 * @a notify with buf NULL and size 0)?
1469 * @param notify function to call
1470 * @param notify_cls closure for @a notify
1471 * @return non-NULL if the notify callback was queued,
1472 * NULL if we are already going to notify someone else (busy)
1473 */
1474struct GNUNET_CONNECTION_TransmitHandle *
1475GNUNET_CONNECTION_notify_transmit_ready (
1476 struct GNUNET_CONNECTION_Handle *connection,
1477 size_t size,
1478 struct GNUNET_TIME_Relative timeout,
1479 GNUNET_CONNECTION_TransmitReadyNotify notify,
1480 void *notify_cls)
1481{
1482 if (NULL != connection->nth.notify_ready)
1483 {
1484 GNUNET_assert (0);
1485 return NULL;
1486 }
1487 GNUNET_assert (NULL != notify);
1488 GNUNET_assert (size < GNUNET_MAX_MESSAGE_SIZE);
1489 GNUNET_assert (connection->write_buffer_off <= connection->write_buffer_size);
1490 GNUNET_assert (connection->write_buffer_pos <= connection->write_buffer_size);
1491 GNUNET_assert (connection->write_buffer_pos <= connection->write_buffer_off);
1492 connection->nth.notify_ready = notify;
1493 connection->nth.notify_ready_cls = notify_cls;
1494 connection->nth.connection = connection;
1495 connection->nth.notify_size = size;
1496 connection->nth.transmit_timeout = GNUNET_TIME_relative_to_absolute (timeout);
1497 GNUNET_assert (NULL == connection->nth.timeout_task);
1498 if ((NULL == connection->sock) && (NULL == connection->ap_head) &&
1499 (NULL == connection->dns_active) && (NULL == connection->proxy_handshake))
1500 {
1501 if (NULL != connection->write_task)
1502 GNUNET_SCHEDULER_cancel (connection->write_task);
1503 connection->write_task =
1504 GNUNET_SCHEDULER_add_now (&connect_error, connection);
1505 return &connection->nth;
1506 }
1507 if (NULL != connection->write_task)
1508 return &connection->nth; /* previous transmission still in progress */
1509 if (NULL != connection->sock)
1510 {
1511 /* connected, try to transmit now */
1512 LOG (GNUNET_ERROR_TYPE_DEBUG,
1513 "Scheduling transmission (%p).\n",
1514 connection);
1515 connection->write_task =
1516 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_absolute_get_remaining (
1517 connection->nth.transmit_timeout),
1518 connection->sock,
1519 &transmit_ready,
1520 connection);
1521 return &connection->nth;
1522 }
1523 /* not yet connected, wait for connection */
1524 LOG (GNUNET_ERROR_TYPE_DEBUG,
1525 "Need to wait to schedule transmission for connection, adding timeout task (%p).\n",
1526 connection);
1527 connection->nth.timeout_task =
1528 GNUNET_SCHEDULER_add_delayed (timeout, &transmit_timeout, connection);
1529 return &connection->nth;
1530}
1531
1532
1533/**
1534 * Cancel the specified transmission-ready notification.
1535 *
1536 * @param th notification to cancel
1537 */
1538void
1539GNUNET_CONNECTION_notify_transmit_ready_cancel (
1540 struct GNUNET_CONNECTION_TransmitHandle *th)
1541{
1542 GNUNET_assert (NULL != th->notify_ready);
1543 th->notify_ready = NULL;
1544 if (NULL != th->timeout_task)
1545 {
1546 GNUNET_SCHEDULER_cancel (th->timeout_task);
1547 th->timeout_task = NULL;
1548 }
1549 if (NULL != th->connection->write_task)
1550 {
1551 GNUNET_SCHEDULER_cancel (th->connection->write_task);
1552 th->connection->write_task = NULL;
1553 }
1554}
1555
1556
1557/**
1558 * Create a connection to be proxied using a given connection.
1559 *
1560 * @param cph connection to proxy server
1561 * @return connection to be proxied
1562 */
1563struct GNUNET_CONNECTION_Handle *
1564GNUNET_CONNECTION_create_proxied_from_handshake (
1565 struct GNUNET_CONNECTION_Handle *cph)
1566{
1567 struct GNUNET_CONNECTION_Handle *proxied =
1568 GNUNET_CONNECTION_create_from_existing (NULL);
1569
1570 proxied->proxy_handshake = cph;
1571 return proxied;
1572}
1573
1574
1575/**
1576 * Activate proxied connection and destroy initial proxy handshake connection.
1577 * There must not be any pending requests for reading or writing to the
1578 * proxy hadshake connection at this time.
1579 *
1580 * @param proxied connection connection to proxy server
1581 */
1582void
1583GNUNET_CONNECTION_acivate_proxied (struct GNUNET_CONNECTION_Handle *proxied)
1584{
1585 struct GNUNET_CONNECTION_Handle *cph = proxied->proxy_handshake;
1586
1587 GNUNET_assert (NULL != cph);
1588 GNUNET_assert (NULL == proxied->sock);
1589 GNUNET_assert (NULL != cph->sock);
1590 proxied->sock = cph->sock;
1591 cph->sock = NULL;
1592 GNUNET_CONNECTION_destroy (cph);
1593 connect_success_continuation (proxied);
1594}
1595
1596
1597/* end of connection.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-24 13:55:58 +0000