2 This file is part of GNUnet
3 (C) 2010 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 3, 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 transport/plugin_transport_unix.c
23 * @brief Transport plugin using unix domain sockets (!)
24 * Clearly, can only be used locally on Unix/Linux hosts...
25 * ONLY INTENDED FOR TESTING!!!
26 * @author Christian Grothoff
27 * @author Nathan Evans
31 #include "gnunet_hello_lib.h"
32 #include "gnunet_connection_lib.h"
33 #include "gnunet_container_lib.h"
34 #include "gnunet_os_lib.h"
35 #include "gnunet_peerinfo_service.h"
36 #include "gnunet_protocols.h"
37 #include "gnunet_resolver_service.h"
38 #include "gnunet_server_lib.h"
39 #include "gnunet_signatures.h"
40 #include "gnunet_statistics_service.h"
41 #include "gnunet_transport_service.h"
42 #include "gnunet_transport_plugin.h"
43 #include "transport.h"
47 #define LOG(kind,...) GNUNET_log_from (kind, "transport-unix",__VA_ARGS__)
50 * Transport cost to peer, always 1 for UNIX (direct connection)
52 #define UNIX_DIRECT_DISTANCE 1
54 #define DEFAULT_NAT_PORT 0
57 * How long until we give up on transmitting the welcome message?
59 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
62 * Starting port for listening and sending, eventually a config value
64 #define UNIX_NAT_DEFAULT_PORT 22086
66 GNUNET_NETWORK_STRUCT_BEGIN
69 * UNIX Message-Packet header.
76 struct GNUNET_MessageHeader header;
79 * What is the identity of the sender (GNUNET_hash of public key)
81 struct GNUNET_PeerIdentity sender;
87 struct GNUNET_PeerIdentity target;
93 * Session timeout task
95 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
97 struct Plugin * plugin;
100 struct UNIXMessageWrapper
102 struct UNIXMessageWrapper *next;
103 struct UNIXMessageWrapper *prev;
105 struct UNIXMessage * msg;
109 struct GNUNET_TIME_Relative timeout;
110 unsigned int priority;
112 struct Session *session;
113 GNUNET_TRANSPORT_TransmitContinuation cont;
117 /* Forward definition */
128 * Stored in a linked list.
130 struct PeerSession *next;
133 * Pointer to the global plugin struct.
135 struct Plugin *plugin;
138 * To whom are we talking to (set to our identity
139 * if we are still waiting for the welcome message)
141 struct GNUNET_PeerIdentity target;
144 * Address of the other peer (either based on our 'connect'
145 * call or on our 'accept' call).
150 * Length of connect_addr.
155 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
157 int expecting_welcome;
160 * From which socket do we need to send to this peer?
162 struct GNUNET_NETWORK_Handle *sock;
165 * Queue of messages for this peer, in the case that
166 * we have to await a connection...
168 struct MessageQueue *messages;
173 * Information we keep for each of our listen sockets.
175 struct UNIX_Sock_Info
180 struct GNUNET_NETWORK_Handle *desc;
183 * The port we bound to
190 * Encapsulation of all of the state of the plugin.
197 struct GNUNET_TRANSPORT_PluginEnvironment *env;
202 struct GNUNET_CONTAINER_MultiHashMap *session_map;
205 * ID of task used to update our addresses when one expires.
207 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
212 GNUNET_SCHEDULER_TaskIdentifier select_task;
215 * Integer to append to unix domain socket.
222 struct GNUNET_NETWORK_FDSet *rs;
227 struct GNUNET_NETWORK_FDSet *ws;
232 * socket that we transmit all data with
234 struct UNIX_Sock_Info unix_sock;
237 * Path of our unix domain socket (/tmp/unix-plugin-PORT)
239 char *unix_socket_path;
241 struct UNIXMessageWrapper *msg_head;
242 struct UNIXMessageWrapper *msg_tail;
247 struct GNUNET_ATS_Information ats_network;
249 unsigned int bytes_in_queue;
250 unsigned int bytes_in_sent;
251 unsigned int bytes_in_recv;
252 unsigned int bytes_discarded;
256 * Start session timeout
259 start_session_timeout (struct Session *s);
262 * Increment session timeout due to activity
265 reschedule_session_timeout (struct Session *s);
271 stop_session_timeout (struct Session *s);
275 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
279 reschedule_select (struct Plugin * plugin)
282 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
284 GNUNET_SCHEDULER_cancel (plugin->select_task);
285 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
288 if (NULL != plugin->msg_head)
290 plugin->select_task =
291 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
292 GNUNET_TIME_UNIT_FOREVER_REL,
295 &unix_plugin_select, plugin);
296 plugin->with_ws = GNUNET_YES;
300 plugin->select_task =
301 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
302 GNUNET_TIME_UNIT_FOREVER_REL,
305 &unix_plugin_select, plugin);
306 plugin->with_ws = GNUNET_NO;
313 const struct sockaddr_un *addr;
316 int lookup_session_it (void *cls,
317 const struct GNUNET_HashCode * key,
320 struct LookupCtx *lctx = cls;
321 struct Session *t = value;
323 if (0 == strcmp (t->addr, lctx->addr->sun_path))
332 static struct Session *
333 lookup_session (struct Plugin *plugin, struct GNUNET_PeerIdentity *sender, const struct sockaddr_un *addr)
335 struct LookupCtx lctx;
337 GNUNET_assert (NULL != plugin);
338 GNUNET_assert (NULL != sender);
339 GNUNET_assert (NULL != addr);
344 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->session_map, &sender->hashPubKey, &lookup_session_it, &lctx);
350 * Functions with this signature are called whenever we need
351 * to close a session due to a disconnect or failure to
352 * establish a connection.
354 * @param s session to close down
357 disconnect_session (struct Session *s)
359 struct UNIXMessageWrapper *msgw;
360 struct UNIXMessageWrapper *next;
361 struct Plugin * plugin = s->plugin;
363 GNUNET_assert (plugin != NULL);
364 GNUNET_assert (s != NULL);
366 LOG (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting session for peer `%s' `%s' \n", GNUNET_i2s (&s->target), s->addr);
367 stop_session_timeout (s);
368 plugin->env->session_end (plugin->env->cls, &s->target, s);
370 msgw = plugin->msg_head;
372 next = plugin->msg_head;
377 if (msgw->session != s)
379 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
380 if (NULL != msgw->cont)
381 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR,
383 GNUNET_free (msgw->msg);
385 removed = GNUNET_YES;
387 if ((GNUNET_YES == removed) && (NULL == plugin->msg_head))
388 reschedule_select (plugin);
390 GNUNET_assert (GNUNET_YES ==
391 GNUNET_CONTAINER_multihashmap_remove(plugin->session_map, &s->target.hashPubKey, s));
393 GNUNET_STATISTICS_set(plugin->env->stats,
394 "# UNIX sessions active",
395 GNUNET_CONTAINER_multihashmap_size(plugin->session_map),
402 get_session_delete_it (void *cls, const struct GNUNET_HashCode * key, void *value)
404 struct Session *s = value;
405 disconnect_session (s);
411 * Disconnect from a remote node. Clean up session if we have one for this peer
413 * @param cls closure for this call (should be handle to Plugin)
414 * @param target the peeridentity of the peer to disconnect
415 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
418 unix_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
420 struct Plugin *plugin = cls;
421 GNUNET_assert (plugin != NULL);
423 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->session_map, &target->hashPubKey, &get_session_delete_it, plugin);
428 * Shutdown the server process (stop receiving inbound traffic). Maybe
431 * @param cls Handle to the plugin for this transport
433 * @return returns the number of sockets successfully closed,
434 * should equal the number of sockets successfully opened
437 unix_transport_server_stop (void *cls)
439 struct Plugin *plugin = cls;
440 struct UNIXMessageWrapper * msgw;
442 while (NULL != (msgw = plugin->msg_head))
444 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
445 if (msgw->cont != NULL)
446 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR,
448 GNUNET_free (msgw->msg);
452 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
454 GNUNET_SCHEDULER_cancel (plugin->select_task);
455 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
458 if (NULL != plugin->unix_sock.desc)
460 GNUNET_break (GNUNET_OK ==
461 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc));
462 plugin->unix_sock.desc = NULL;
463 plugin->with_ws = GNUNET_NO;
470 * Actually send out the message, assume we've got the address and
471 * send_handle squared away!
474 * @param send_handle which handle to send message on
475 * @param target who should receive this message (ignored by UNIX)
476 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
477 * @param msgbuf_size the size of the msgbuf to send
478 * @param priority how important is the message (ignored by UNIX)
479 * @param timeout when should we time out (give up) if we can not transmit?
480 * @param addr the addr to send the message to, needs to be a sockaddr for us
481 * @param addrlen the len of addr
482 * @param payload bytes payload to send
483 * @param cont continuation to call once the message has
484 * been transmitted (or if the transport is ready
485 * for the next transmission call; or if the
486 * peer disconnected...)
487 * @param cont_cls closure for cont
489 * @return the number of bytes written, -1 on errors
492 unix_real_send (void *cls,
493 struct GNUNET_NETWORK_Handle *send_handle,
494 const struct GNUNET_PeerIdentity *target, const char *msgbuf,
495 size_t msgbuf_size, unsigned int priority,
496 struct GNUNET_TIME_Relative timeout,
500 GNUNET_TRANSPORT_TransmitContinuation cont,
503 struct Plugin *plugin = cls;
507 struct sockaddr_un un;
510 GNUNET_assert (NULL != plugin);
512 if (send_handle == NULL)
514 /* We do not have a send handle */
517 cont (cont_cls, target, GNUNET_SYSERR, payload, 0);
520 if ((addr == NULL) || (addrlen == 0))
522 /* Can never send if we don't have an address */
525 cont (cont_cls, target, GNUNET_SYSERR, payload, 0);
529 /* Prepare address */
530 memset (&un, 0, sizeof (un));
531 un.sun_family = AF_UNIX;
532 slen = strlen (addr) + 1;
533 if (slen >= sizeof (un.sun_path))
534 slen = sizeof (un.sun_path) - 1;
535 GNUNET_assert (slen < sizeof (un.sun_path));
536 memcpy (un.sun_path, addr, slen);
537 un.sun_path[slen] = '\0';
538 slen = sizeof (struct sockaddr_un);
540 un.sun_path[0] = '\0';
542 #if HAVE_SOCKADDR_IN_SIN_LEN
543 un.sun_len = (u_char) slen;
545 sb = (struct sockaddr *) &un;
550 sent = GNUNET_NETWORK_socket_sendto (send_handle, msgbuf, msgbuf_size, sb, sbs);
552 if ((GNUNET_SYSERR == sent) && ((errno == EAGAIN) || (errno == ENOBUFS)))
554 /* We have to retry later: retry */
558 if ((GNUNET_SYSERR == sent) && (errno == EMSGSIZE))
561 socklen_t len = sizeof (size);
563 GNUNET_NETWORK_socket_getsockopt ((struct GNUNET_NETWORK_Handle *)
564 send_handle, SOL_SOCKET, SO_SNDBUF, &size,
567 if (size < msgbuf_size)
569 LOG (GNUNET_ERROR_TYPE_DEBUG,
570 "Trying to increase socket buffer size from %i to %i for message size %i\n",
572 ((msgbuf_size / 1000) + 2) * 1000,
574 size = ((msgbuf_size / 1000) + 2) * 1000;
575 if (GNUNET_NETWORK_socket_setsockopt
576 ((struct GNUNET_NETWORK_Handle *) send_handle, SOL_SOCKET, SO_SNDBUF,
577 &size, sizeof (size)) == GNUNET_OK)
579 /* Increased buffer size, retry sending */
584 /* Could not increase buffer size: error, no retry */
585 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "setsockopt");
591 /* Buffer is bigger than message: error, no retry
592 * This should never happen!*/
598 LOG (GNUNET_ERROR_TYPE_DEBUG,
599 "UNIX transmit %u-byte message to %s (%d: %s)\n",
600 (unsigned int) msgbuf_size, GNUNET_a2s (sb, sbs), (int) sent,
601 (sent < 0) ? STRERROR (errno) : "ok");
603 /* Calling continuation */
606 if (sent == GNUNET_SYSERR)
607 cont (cont_cls, target, GNUNET_SYSERR, payload, 0);
609 cont (cont_cls, target, GNUNET_OK, payload, msgbuf_size);
612 /* return number of bytes successfully sent */
617 /* That should never happen */
621 /* failed and retry: return 0 */
622 if (GNUNET_SYSERR == sent)
637 get_session_it (void *cls, const struct GNUNET_HashCode * key, void *value)
639 struct gsi_ctx *gsi = cls;
640 struct Session *s = value;
642 LOG (GNUNET_ERROR_TYPE_DEBUG, "Comparing session %s %s\n", gsi->address, s->addr);
643 if ((gsi->addrlen == s->addrlen) &&
644 (0 == memcmp (gsi->address, s->addr, s->addrlen)))
653 * Creates a new outbound session the transport service will use to send data to the
656 * @param cls the plugin
657 * @param address the address
658 * @return the session or NULL of max connections exceeded
660 static struct Session *
661 unix_plugin_get_session (void *cls,
662 const struct GNUNET_HELLO_Address *address)
664 struct Session * s = NULL;
665 struct Plugin *plugin = cls;
669 GNUNET_assert (plugin != NULL);
670 GNUNET_assert (address != NULL);
672 /* Check if already existing */
673 gsi.address = (char *) address->address;
674 gsi.addrlen = address->address_length;
676 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->session_map, &address->peer.hashPubKey, &get_session_it, &gsi);
679 LOG (GNUNET_ERROR_TYPE_DEBUG, "Found existing session\n");
683 /* Create a new session */
684 s = GNUNET_malloc (sizeof (struct Session) + address->address_length);
686 s->addrlen = address->address_length;
688 memcpy(s->addr, address->address, s->addrlen);
689 memcpy(&s->target, &address->peer, sizeof (struct GNUNET_PeerIdentity));
691 start_session_timeout (s);
693 GNUNET_CONTAINER_multihashmap_put (plugin->session_map,
694 &address->peer.hashPubKey, s,
695 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
697 GNUNET_STATISTICS_set(plugin->env->stats,
698 "# UNIX sessions active",
699 GNUNET_CONTAINER_multihashmap_size(plugin->session_map),
701 LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating new session\n");
706 * @param cls the plugin handle
707 * @param tc the scheduling context (for rescheduling this function again)
709 * We have been notified that our writeset has something to read. We don't
710 * know which socket needs to be read, so we have to check each one
711 * Then reschedule this function to be called again once more is available.
715 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
718 * Function that can be used by the transport service to transmit
719 * a message using the plugin. Note that in the case of a
720 * peer disconnecting, the continuation MUST be called
721 * prior to the disconnect notification itself. This function
722 * will be called with this peer's HELLO message to initiate
723 * a fresh connection to another peer.
726 * @param session which session must be used
727 * @param msgbuf the message to transmit
728 * @param msgbuf_size number of bytes in 'msgbuf'
729 * @param priority how important is the message (most plugins will
730 * ignore message priority and just FIFO)
731 * @param to how long to wait at most for the transmission (does not
732 * require plugins to discard the message after the timeout,
733 * just advisory for the desired delay; most plugins will ignore
735 * @param cont continuation to call once the message has
736 * been transmitted (or if the transport is ready
737 * for the next transmission call; or if the
738 * peer disconnected...); can be NULL
739 * @param cont_cls closure for cont
740 * @return number of bytes used (on the physical network, with overheads);
741 * -1 on hard errors (i.e. address invalid); 0 is a legal value
742 * and does NOT mean that the message was not transmitted (DV)
745 unix_plugin_send (void *cls,
746 struct Session *session,
747 const char *msgbuf, size_t msgbuf_size,
748 unsigned int priority,
749 struct GNUNET_TIME_Relative to,
750 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
752 struct Plugin *plugin = cls;
753 struct UNIXMessageWrapper *wrapper;
754 struct UNIXMessage *message;
757 GNUNET_assert (plugin != NULL);
758 GNUNET_assert (session != NULL);
760 if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_contains_value(plugin->session_map,
761 &session->target.hashPubKey, session))
763 LOG (GNUNET_ERROR_TYPE_ERROR, "Invalid session for peer `%s' `%s'\n",
764 GNUNET_i2s (&session->target),
765 (char *) session->addr);
768 return GNUNET_SYSERR;
770 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending %u bytes with session for peer `%s' `%s'\n",
772 GNUNET_i2s (&session->target),
773 (char *) session->addr);
775 ssize = sizeof (struct UNIXMessage) + msgbuf_size;
776 message = GNUNET_malloc (sizeof (struct UNIXMessage) + msgbuf_size);
777 message->header.size = htons (ssize);
778 message->header.type = htons (0);
779 memcpy (&message->sender, plugin->env->my_identity,
780 sizeof (struct GNUNET_PeerIdentity));
781 memcpy (&message[1], msgbuf, msgbuf_size);
783 reschedule_session_timeout (session);
785 wrapper = GNUNET_malloc (sizeof (struct UNIXMessageWrapper));
786 wrapper->msg = message;
787 wrapper->msgsize = ssize;
788 wrapper->payload = msgbuf_size;
789 wrapper->priority = priority;
790 wrapper->timeout = to;
791 wrapper->cont = cont;
792 wrapper->cont_cls = cont_cls;
793 wrapper->session = session;
795 GNUNET_CONTAINER_DLL_insert(plugin->msg_head, plugin->msg_tail, wrapper);
797 plugin->bytes_in_queue += ssize;
798 GNUNET_STATISTICS_set (plugin->env->stats,"# bytes currently in UNIX buffers",
799 plugin->bytes_in_queue, GNUNET_NO);
801 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sent %d bytes to `%s'\n", ssize,
802 (char *) session->addr);
803 if (plugin->with_ws == GNUNET_NO)
805 reschedule_select (plugin);
813 * Demultiplexer for UNIX messages
815 * @param plugin the main plugin for this transport
816 * @param sender from which peer the message was received
817 * @param currhdr pointer to the header of the message
818 * @param un the address from which the message was received
819 * @param fromlen the length of the address
822 unix_demultiplexer (struct Plugin *plugin, struct GNUNET_PeerIdentity *sender,
823 const struct GNUNET_MessageHeader *currhdr,
824 const struct sockaddr_un *un, size_t fromlen)
826 struct GNUNET_ATS_Information ats[2];
827 struct Session *s = NULL;
828 struct GNUNET_HELLO_Address * addr;
830 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
831 ats[0].value = htonl (UNIX_DIRECT_DISTANCE);
832 ats[1] = plugin->ats_network;
833 GNUNET_break (ntohl(plugin->ats_network.value) != GNUNET_ATS_NET_UNSPECIFIED);
835 GNUNET_assert (fromlen >= sizeof (struct sockaddr_un));
837 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received message from %s\n",
842 plugin->bytes_in_recv += ntohs(currhdr->size);
843 GNUNET_STATISTICS_set (plugin->env->stats,"# bytes received via UNIX",
844 plugin->bytes_in_recv, GNUNET_NO);
846 addr = GNUNET_HELLO_address_allocate(sender, "unix", un->sun_path, strlen (un->sun_path) + 1);
847 s = lookup_session (plugin, sender, un);
849 s = unix_plugin_get_session (plugin, addr);
850 reschedule_session_timeout (s);
852 plugin->env->receive (plugin->env->cls, sender, currhdr,
853 (const struct GNUNET_ATS_Information *) &ats, 2,
854 s, un->sun_path, strlen (un->sun_path) + 1);
860 unix_plugin_select_read (struct Plugin * plugin)
862 char buf[65536] GNUNET_ALIGN;
863 struct UNIXMessage *msg;
864 struct GNUNET_PeerIdentity sender;
865 struct sockaddr_un un;
871 const struct GNUNET_MessageHeader *currhdr;
874 addrlen = sizeof (un);
875 memset (&un, 0, sizeof (un));
878 GNUNET_NETWORK_socket_recvfrom (plugin->unix_sock.desc, buf, sizeof (buf),
879 (struct sockaddr *) &un, &addrlen);
881 if ((GNUNET_SYSERR == ret) && ((errno == EAGAIN) || (errno == ENOBUFS)))
884 if (ret == GNUNET_SYSERR)
886 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "recvfrom");
892 un.sun_path[0] = '/';
894 LOG (GNUNET_ERROR_TYPE_DEBUG, "Read %d bytes from socket %s\n", ret,
898 GNUNET_assert (AF_UNIX == (un.sun_family));
900 msg = (struct UNIXMessage *) buf;
901 csize = ntohs (msg->header.size);
902 if ((csize < sizeof (struct UNIXMessage)) || (csize > ret))
907 msgbuf = (char *) &msg[1];
908 memcpy (&sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
910 tsize = csize - sizeof (struct UNIXMessage);
911 while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
913 currhdr = (struct GNUNET_MessageHeader *) &msgbuf[offset];
914 csize = ntohs (currhdr->size);
915 if ((csize < sizeof (struct GNUNET_MessageHeader)) ||
916 (csize > tsize - offset))
922 unix_demultiplexer (plugin, &sender, currhdr, &un, sizeof (un));
929 unix_plugin_select_write (struct Plugin * plugin)
931 static int retry_counter;
933 struct UNIXMessageWrapper * msgw = plugin->msg_head;
935 sent = unix_real_send (plugin,
936 plugin->unix_sock.desc,
937 &msgw->session->target,
938 (const char *) msgw->msg,
943 msgw->session->addrlen,
945 msgw->cont, msgw->cont_cls);
949 /* failed and retry */
951 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX retry attempt",
952 retry_counter, GNUNET_NO);
956 if (retry_counter > 0 )
958 /* no retry: reset counter */
960 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX retry attempt",
961 retry_counter, GNUNET_NO);
966 /* failed and no retry */
967 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, msgw);
969 GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
970 plugin->bytes_in_queue -= msgw->msgsize;
971 GNUNET_STATISTICS_set (plugin->env->stats, "# bytes currently in UNIX buffers",
972 plugin->bytes_in_queue, GNUNET_NO);
973 plugin->bytes_discarded += msgw->msgsize;
974 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX bytes discarded",
975 plugin->bytes_discarded, GNUNET_NO);
977 GNUNET_free (msgw->msg);
984 /* successfully sent bytes */
985 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, msgw);
987 GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
988 plugin->bytes_in_queue -= msgw->msgsize;
989 GNUNET_STATISTICS_set (plugin->env->stats,"# bytes currently in UNIX buffers",
990 plugin->bytes_in_queue, GNUNET_NO);
991 plugin->bytes_in_sent += msgw->msgsize;
992 GNUNET_STATISTICS_set (plugin->env->stats,"# bytes transmitted via UNIX",
993 plugin->bytes_in_sent, GNUNET_NO);
995 GNUNET_free (msgw->msg);
1004 * We have been notified that our writeset has something to read. We don't
1005 * know which socket needs to be read, so we have to check each one
1006 * Then reschedule this function to be called again once more is available.
1008 * @param cls the plugin handle
1009 * @param tc the scheduling context (for rescheduling this function again)
1012 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1014 struct Plugin *plugin = cls;
1016 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1017 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1020 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1022 /* Ready to send data */
1023 GNUNET_assert (GNUNET_NETWORK_fdset_isset
1024 (tc->write_ready, plugin->unix_sock.desc));
1025 if (plugin->msg_head != NULL)
1026 unix_plugin_select_write (plugin);
1029 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1031 /* Ready to receive data */
1032 GNUNET_assert (GNUNET_NETWORK_fdset_isset
1033 (tc->read_ready, plugin->unix_sock.desc));
1034 unix_plugin_select_read (plugin);
1037 reschedule_select (plugin);
1042 * Create a slew of UNIX sockets. If possible, use IPv6 and IPv4.
1044 * @param cls closure for server start, should be a struct Plugin *
1045 * @return number of sockets created or GNUNET_SYSERR on error
1048 unix_transport_server_start (void *cls)
1050 struct Plugin *plugin = cls;
1051 struct sockaddr *serverAddr;
1053 struct sockaddr_un un;
1056 memset (&un, 0, sizeof (un));
1057 un.sun_family = AF_UNIX;
1058 slen = strlen (plugin->unix_socket_path) + 1;
1059 if (slen >= sizeof (un.sun_path))
1060 slen = sizeof (un.sun_path) - 1;
1062 memcpy (un.sun_path, plugin->unix_socket_path, slen);
1063 un.sun_path[slen] = '\0';
1064 slen = sizeof (struct sockaddr_un);
1065 #if HAVE_SOCKADDR_IN_SIN_LEN
1066 un.sun_len = (u_char) slen;
1069 serverAddr = (struct sockaddr *) &un;
1072 un.sun_path[0] = '\0';
1074 plugin->ats_network = plugin->env->get_address_type (plugin->env->cls, serverAddr, addrlen);
1075 plugin->unix_sock.desc =
1076 GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_DGRAM, 0);
1077 if (NULL == plugin->unix_sock.desc)
1079 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
1080 return GNUNET_SYSERR;
1082 if (GNUNET_NETWORK_socket_bind (plugin->unix_sock.desc, serverAddr, addrlen)
1085 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
1086 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc);
1087 plugin->unix_sock.desc = NULL;
1088 return GNUNET_SYSERR;
1090 LOG (GNUNET_ERROR_TYPE_DEBUG, "Bound to `%s'\n", plugin->unix_socket_path);
1091 plugin->rs = GNUNET_NETWORK_fdset_create ();
1092 plugin->ws = GNUNET_NETWORK_fdset_create ();
1093 GNUNET_NETWORK_fdset_zero (plugin->rs);
1094 GNUNET_NETWORK_fdset_zero (plugin->ws);
1095 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->unix_sock.desc);
1096 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->unix_sock.desc);
1098 reschedule_select (plugin);
1105 * Function that will be called to check if a binary address for this
1106 * plugin is well-formed and corresponds to an address for THIS peer
1107 * (as per our configuration). Naturally, if absolutely necessary,
1108 * plugins can be a bit conservative in their answer, but in general
1109 * plugins should make sure that the address does not redirect
1110 * traffic to a 3rd party that might try to man-in-the-middle our
1113 * @param cls closure, should be our handle to the Plugin
1114 * @param addr pointer to the address
1115 * @param addrlen length of addr
1116 * @return GNUNET_OK if this is a plausible address for this peer
1117 * and transport, GNUNET_SYSERR if not
1121 unix_check_address (void *cls, const void *addr, size_t addrlen)
1123 LOG (GNUNET_ERROR_TYPE_DEBUG,
1124 "Informing transport service about my address `%s'\n",
1131 * Convert the transports address to a nice, human-readable
1134 * @param cls closure
1135 * @param type name of the transport that generated the address
1136 * @param addr one of the addresses of the host, NULL for the last address
1137 * the specific address format depends on the transport
1138 * @param addrlen length of the address
1139 * @param numeric should (IP) addresses be displayed in numeric form?
1140 * @param timeout after how long should we give up?
1141 * @param asc function to call on each string
1142 * @param asc_cls closure for asc
1145 unix_plugin_address_pretty_printer (void *cls, const char *type,
1146 const void *addr, size_t addrlen,
1148 struct GNUNET_TIME_Relative timeout,
1149 GNUNET_TRANSPORT_AddressStringCallback asc,
1152 if ((NULL != addr) && (addrlen > 0))
1154 asc (asc_cls, (const char *) addr);
1159 asc (asc_cls, "<invalid UNIX address>");
1161 asc (asc_cls, NULL);
1166 * Function called to convert a string address to
1169 * @param cls closure ('struct Plugin*')
1170 * @param addr string address
1171 * @param addrlen length of the address (strlen(addr) + '\0')
1172 * @param buf location to store the buffer
1173 * If the function returns GNUNET_SYSERR, its contents are undefined.
1174 * @param added length of created address
1175 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
1178 unix_string_to_address (void *cls, const char *addr, uint16_t addrlen,
1179 void **buf, size_t *added)
1181 if ((NULL == addr) || (0 == addrlen))
1184 return GNUNET_SYSERR;
1187 if ('\0' != addr[addrlen - 1])
1190 return GNUNET_SYSERR;
1193 if (strlen (addr) != addrlen - 1)
1196 return GNUNET_SYSERR;
1199 (*buf) = strdup (addr);
1200 (*added) = strlen (addr) + 1;
1206 * Function called for a quick conversion of the binary address to
1207 * a numeric address. Note that the caller must not free the
1208 * address and that the next call to this function is allowed
1209 * to override the address again.
1211 * @param cls closure
1212 * @param addr binary address
1213 * @param addrlen length of the address
1214 * @return string representing the same address
1217 unix_address_to_string (void *cls, const void *addr, size_t addrlen)
1219 if ((addr != NULL) && (addrlen > 0))
1220 return (const char *) addr;
1226 * Notify transport service about address
1228 * @param cls the plugin
1232 address_notification (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1234 struct Plugin *plugin = cls;
1236 plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
1237 plugin->unix_socket_path,
1238 strlen (plugin->unix_socket_path) + 1,
1244 * Session was idle, so disconnect it
1247 session_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1249 GNUNET_assert (NULL != cls);
1250 struct Session *s = cls;
1252 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1253 LOG (GNUNET_ERROR_TYPE_DEBUG,
1254 "Session %p was idle for %llu ms, disconnecting\n",
1255 s, (unsigned long long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
1256 /* call session destroy function */
1257 disconnect_session(s);
1262 * Start session timeout
1265 start_session_timeout (struct Session *s)
1267 GNUNET_assert (NULL != s);
1268 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s->timeout_task);
1269 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1272 LOG (GNUNET_ERROR_TYPE_DEBUG,
1273 "Timeout for session %p set to %llu ms\n",
1274 s, (unsigned long long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
1279 * Increment session timeout due to activity
1282 reschedule_session_timeout (struct Session *s)
1284 GNUNET_assert (NULL != s);
1285 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s->timeout_task);
1287 GNUNET_SCHEDULER_cancel (s->timeout_task);
1288 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1291 LOG (GNUNET_ERROR_TYPE_DEBUG,
1292 "Timeout rescheduled for session %p set to %llu ms\n",
1293 s, (unsigned long long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
1301 stop_session_timeout (struct Session *s)
1303 GNUNET_assert (NULL != s);
1305 if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task)
1307 GNUNET_SCHEDULER_cancel (s->timeout_task);
1308 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1309 LOG (GNUNET_ERROR_TYPE_DEBUG,
1310 "Timeout stopped for session %p canceled\n",
1311 s, (unsigned long long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
1316 * The exported method. Makes the core api available via a global and
1317 * returns the unix transport API.
1320 libgnunet_plugin_transport_unix_init (void *cls)
1322 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1323 unsigned long long port;
1324 struct GNUNET_TRANSPORT_PluginFunctions *api;
1325 struct Plugin *plugin;
1326 int sockets_created;
1328 if (NULL == env->receive)
1330 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
1331 initialze the plugin or the API */
1332 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1334 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1335 api->address_to_string = &unix_address_to_string;
1336 api->string_to_address = &unix_string_to_address;
1339 GNUNET_assert( NULL != env->stats);
1342 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-unix", "PORT",
1344 port = UNIX_NAT_DEFAULT_PORT;
1345 plugin = GNUNET_malloc (sizeof (struct Plugin));
1346 plugin->port = port;
1348 GNUNET_asprintf (&plugin->unix_socket_path, "/tmp/unix-plugin-sock.%d",
1351 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1354 api->get_session = &unix_plugin_get_session;
1355 api->send = &unix_plugin_send;
1356 api->disconnect = &unix_disconnect;
1357 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1358 api->address_to_string = &unix_address_to_string;
1359 api->check_address = &unix_check_address;
1360 api->string_to_address = &unix_string_to_address;
1361 sockets_created = unix_transport_server_start (plugin);
1362 if (sockets_created == 0)
1363 LOG (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UNIX sockets\n"));
1365 plugin->session_map = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
1367 GNUNET_SCHEDULER_add_now (address_notification, plugin);
1372 libgnunet_plugin_transport_unix_done (void *cls)
1374 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1375 struct Plugin *plugin = api->cls;
1383 plugin->env->notify_address (plugin->env->cls, GNUNET_NO,
1384 plugin->unix_socket_path,
1385 strlen (plugin->unix_socket_path) + 1,
1388 unix_transport_server_stop (plugin);
1391 GNUNET_CONTAINER_multihashmap_iterate (plugin->session_map, &get_session_delete_it, plugin);
1392 GNUNET_CONTAINER_multihashmap_destroy (plugin->session_map);
1395 if (NULL != plugin->rs)
1396 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1397 if (NULL != plugin->ws)
1398 GNUNET_NETWORK_fdset_destroy (plugin->ws);
1399 GNUNET_free (plugin->unix_socket_path);
1400 GNUNET_free (plugin);
1405 /* end of plugin_transport_unix.c */