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"
45 #define DEBUG_UNIX GNUNET_EXTRA_LOGGING
46 #define DETAILS GNUNET_NO
51 * Transport cost to peer, always 1 for UNIX (direct connection)
53 #define UNIX_DIRECT_DISTANCE 1
55 #define DEFAULT_NAT_PORT 0
58 * How long until we give up on transmitting the welcome message?
60 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
63 * Starting port for listening and sending, eventually a config value
65 #define UNIX_NAT_DEFAULT_PORT 22086
68 * UNIX Message-Packet header.
75 struct GNUNET_MessageHeader header;
78 * What is the identity of the sender (GNUNET_hash of public key)
80 struct GNUNET_PeerIdentity sender;
87 * Pointer to next element.
89 struct RetryList *next;
92 * Pointer to previous element.
94 struct RetryList *prev;
97 * The actual retry context.
99 struct RetrySendContext *retry_ctx;
103 * Network format for IPv4 addresses.
105 struct IPv4UdpAddress
108 * IPv4 address, in network byte order.
110 uint32_t ipv4_addr GNUNET_PACKED;
113 * Port number, in network byte order.
115 uint16_t u_port GNUNET_PACKED;
120 * Network format for IPv6 addresses.
122 struct IPv6UdpAddress
127 struct in6_addr ipv6_addr GNUNET_PACKED;
130 * Port number, in network byte order.
132 uint16_t u6_port GNUNET_PACKED;
135 /* Forward definition */
138 struct PrettyPrinterContext
140 GNUNET_TRANSPORT_AddressStringCallback asc;
145 struct RetrySendContext
149 * Main plugin handle.
151 struct Plugin *plugin;
154 * Address of recipient.
169 * Size of the message.
174 * Handle to send message out on.
176 struct GNUNET_NETWORK_Handle *send_handle;
179 * Continuation to call on success or
182 GNUNET_TRANSPORT_TransmitContinuation cont;
185 * Closure for continuation.
190 * The peer the message is destined for.
192 struct GNUNET_PeerIdentity target;
195 * How long before not retrying any longer.
197 struct GNUNET_TIME_Absolute timeout;
200 * How long the last message was delayed.
202 struct GNUNET_TIME_Relative delay;
205 * The actual retry task.
207 GNUNET_SCHEDULER_TaskIdentifier retry_task;
210 * The priority of the message.
212 unsigned int priority;
215 * Entry in the DLL of retry items.
217 struct RetryList *retry_list_entry;
228 * Stored in a linked list.
230 struct PeerSession *next;
233 * Pointer to the global plugin struct.
235 struct Plugin *plugin;
238 * To whom are we talking to (set to our identity
239 * if we are still waiting for the welcome message)
241 struct GNUNET_PeerIdentity target;
244 * Address of the other peer (either based on our 'connect'
245 * call or on our 'accept' call).
250 * Length of connect_addr.
255 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
257 int expecting_welcome;
260 * From which socket do we need to send to this peer?
262 struct GNUNET_NETWORK_Handle *sock;
265 * Queue of messages for this peer, in the case that
266 * we have to await a connection...
268 struct MessageQueue *messages;
273 * Information we keep for each of our listen sockets.
275 struct UNIX_Sock_Info
280 struct GNUNET_NETWORK_Handle *desc;
283 * The port we bound to
290 * Encapsulation of all of the state of the plugin.
297 struct GNUNET_TRANSPORT_PluginEnvironment *env;
300 * Session of peers with whom we are currently connected
302 struct PeerSession *sessions;
305 * ID of task used to update our addresses when one expires.
307 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
312 GNUNET_SCHEDULER_TaskIdentifier select_task;
315 * Integer to append to unix domain socket.
322 struct GNUNET_NETWORK_FDSet *rs;
325 * socket that we transmit all data with
327 struct UNIX_Sock_Info unix_sock;
330 * Path of our unix domain socket (/tmp/unix-plugin-PORT)
332 char *unix_socket_path;
337 struct GNUNET_ATS_Information ats_network;
343 static struct RetryList *retry_list_head;
348 static struct RetryList *retry_list_tail;
352 * Disconnect from a remote node. Clean up session if we have one for this peer
354 * @param cls closure for this call (should be handle to Plugin)
355 * @param target the peeridentity of the peer to disconnect
356 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
359 unix_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
361 /** TODO: Implement! */
366 * Shutdown the server process (stop receiving inbound traffic). Maybe
369 * @param cls Handle to the plugin for this transport
371 * @return returns the number of sockets successfully closed,
372 * should equal the number of sockets successfully opened
375 unix_transport_server_stop (void *cls)
377 struct Plugin *plugin = cls;
378 struct RetryList *pos;
380 pos = retry_list_head;
382 while (NULL != (pos = retry_list_head))
384 GNUNET_CONTAINER_DLL_remove (retry_list_head, retry_list_tail, pos);
385 if (GNUNET_SCHEDULER_NO_TASK != pos->retry_ctx->retry_task)
387 GNUNET_SCHEDULER_cancel (pos->retry_ctx->retry_task);
389 GNUNET_free (pos->retry_ctx->msg);
390 GNUNET_free (pos->retry_ctx->addr);
391 GNUNET_free (pos->retry_ctx);
395 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
397 GNUNET_SCHEDULER_cancel (plugin->select_task);
398 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
401 GNUNET_break (GNUNET_OK ==
402 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc));
403 plugin->unix_sock.desc = NULL;
410 find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer)
412 struct PeerSession *pos;
414 pos = plugin->sessions;
417 if (memcmp (&pos->target, peer, sizeof (struct GNUNET_PeerIdentity)) == 0)
425 /* Forward Declaration */
427 unix_real_send (void *cls, struct RetrySendContext *incoming_retry_context,
428 struct GNUNET_NETWORK_Handle *send_handle,
429 const struct GNUNET_PeerIdentity *target, const char *msgbuf,
430 size_t msgbuf_size, unsigned int priority,
431 struct GNUNET_TIME_Relative timeout, const void *addr,
432 size_t addrlen, GNUNET_TRANSPORT_TransmitContinuation cont,
436 * Retry sending a message.
438 * @param cls closure a struct RetrySendContext
439 * @param tc context information
442 retry_send_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
444 struct RetrySendContext *retry_ctx = cls;
446 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
448 GNUNET_free (retry_ctx->msg);
449 GNUNET_free (retry_ctx->addr);
450 GNUNET_free (retry_ctx);
454 unix_real_send (retry_ctx->plugin, retry_ctx, retry_ctx->send_handle,
455 &retry_ctx->target, retry_ctx->msg, retry_ctx->msg_size,
457 GNUNET_TIME_absolute_get_remaining (retry_ctx->timeout),
458 retry_ctx->addr, retry_ctx->addrlen, retry_ctx->cont,
459 retry_ctx->cont_cls);
464 * Actually send out the message, assume we've got the address and
465 * send_handle squared away!
468 * @param incoming_retry_context the retry context to use
469 * @param send_handle which handle to send message on
470 * @param target who should receive this message (ignored by UNIX)
471 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
472 * @param msgbuf_size the size of the msgbuf to send
473 * @param priority how important is the message (ignored by UNIX)
474 * @param timeout when should we time out (give up) if we can not transmit?
475 * @param addr the addr to send the message to, needs to be a sockaddr for us
476 * @param addrlen the len of addr
477 * @param cont continuation to call once the message has
478 * been transmitted (or if the transport is ready
479 * for the next transmission call; or if the
480 * peer disconnected...)
481 * @param cont_cls closure for cont
483 * @return the number of bytes written, -1 on errors
486 unix_real_send (void *cls, struct RetrySendContext *incoming_retry_context,
487 struct GNUNET_NETWORK_Handle *send_handle,
488 const struct GNUNET_PeerIdentity *target, const char *msgbuf,
489 size_t msgbuf_size, unsigned int priority,
490 struct GNUNET_TIME_Relative timeout, const void *addr,
491 size_t addrlen, GNUNET_TRANSPORT_TransmitContinuation cont,
494 struct Plugin *plugin = cls;
495 struct UNIXMessage *message;
496 struct RetrySendContext *retry_ctx;
501 struct sockaddr_un un;
503 struct RetryList *retry_list_entry;
506 if (send_handle == NULL)
509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
510 "unix_real_send with send_handle NULL!\n");
512 /* failed to open send socket for AF */
514 cont (cont_cls, target, GNUNET_SYSERR);
517 if ((addr == NULL) || (addrlen == 0))
520 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
521 "unix_real_send called without address, returning!\n");
524 cont (cont_cls, target, GNUNET_SYSERR);
525 return 0; /* Can never send if we don't have an address!! */
528 /* Build the message to be sent */
529 message = GNUNET_malloc (sizeof (struct UNIXMessage) + msgbuf_size);
530 ssize = sizeof (struct UNIXMessage) + msgbuf_size;
532 message->header.size = htons (ssize);
533 message->header.type = htons (0);
534 memcpy (&message->sender, plugin->env->my_identity,
535 sizeof (struct GNUNET_PeerIdentity));
536 memcpy (&message[1], msgbuf, msgbuf_size);
538 memset (&un, 0, sizeof (un));
539 un.sun_family = AF_UNIX;
540 slen = strlen (addr) + 1;
541 if (slen >= sizeof (un.sun_path))
542 slen = sizeof (un.sun_path) - 1;
544 GNUNET_assert (slen < sizeof (un.sun_path));
545 memcpy (un.sun_path, addr, slen);
546 un.sun_path[slen] = '\0';
547 slen = sizeof (struct sockaddr_un);
549 un.sun_path[0] = '\0';
551 #if HAVE_SOCKADDR_IN_SIN_LEN
552 un.sun_len = (u_char) slen;
554 sb = (struct sockaddr *) &un;
558 sent = GNUNET_NETWORK_socket_sendto (send_handle, message, ssize, sb, sbs);
560 if ((GNUNET_SYSERR == sent) && ((errno == EAGAIN) || (errno == ENOBUFS)))
563 if ((GNUNET_SYSERR == sent) && (errno == EMSGSIZE))
566 socklen_t len = sizeof (size);
568 GNUNET_NETWORK_socket_getsockopt ((struct GNUNET_NETWORK_Handle *)
569 send_handle, SOL_SOCKET, SO_SNDBUF, &size,
575 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
576 "Trying to increase socket buffer size from %i to %i for message size %i\n",
577 size, ((ssize / 1000) + 2) * 1000, ssize);
579 size = ((ssize / 1000) + 2) * 1000;
580 if (GNUNET_NETWORK_socket_setsockopt
581 ((struct GNUNET_NETWORK_Handle *) send_handle, SOL_SOCKET, SO_SNDBUF,
582 &size, sizeof (size)) == GNUNET_OK)
585 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "setsockopt");
589 if (retry == GNUNET_YES)
591 if (incoming_retry_context == NULL)
593 retry_list_entry = GNUNET_malloc (sizeof (struct RetryList));
594 retry_ctx = GNUNET_malloc (sizeof (struct RetrySendContext));
595 retry_ctx->addr = GNUNET_malloc (addrlen);
596 retry_ctx->msg = GNUNET_malloc (msgbuf_size);
597 retry_ctx->plugin = plugin;
598 memcpy (retry_ctx->addr, addr, addrlen);
599 memcpy (retry_ctx->msg, msgbuf, msgbuf_size);
600 retry_ctx->msg_size = msgbuf_size;
601 retry_ctx->addrlen = addrlen;
602 retry_ctx->send_handle = send_handle;
603 retry_ctx->cont = cont;
604 retry_ctx->cont_cls = cont_cls;
605 retry_ctx->priority = priority;
606 retry_ctx->timeout = GNUNET_TIME_relative_to_absolute (timeout);
607 memcpy (&retry_ctx->target, target, sizeof (struct GNUNET_PeerIdentity));
608 retry_ctx->delay = GNUNET_TIME_UNIT_MILLISECONDS;
609 retry_ctx->retry_list_entry = retry_list_entry;
610 retry_list_entry->retry_ctx = retry_ctx;
611 GNUNET_CONTAINER_DLL_insert (retry_list_head, retry_list_tail,
616 retry_ctx = incoming_retry_context;
617 retry_ctx->delay = GNUNET_TIME_relative_multiply (retry_ctx->delay, 2);
619 retry_ctx->retry_task =
620 GNUNET_SCHEDULER_add_delayed (retry_ctx->delay, &retry_send_message,
623 //GNUNET_log_strerror (GNUNET_ERROR_TYPE_DEBUG, "send");
624 GNUNET_free (message);
628 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
629 "UNIX transmit %u-byte message to %s (%d: %s)\n",
630 (unsigned int) ssize, GNUNET_a2s (sb, sbs), (int) sent,
631 (sent < 0) ? STRERROR (errno) : "ok");
635 if (sent == GNUNET_SYSERR)
636 cont (cont_cls, target, GNUNET_SYSERR);
639 cont (cont_cls, target, GNUNET_OK);
643 if (incoming_retry_context != NULL)
645 GNUNET_CONTAINER_DLL_remove (retry_list_head, retry_list_tail,
646 incoming_retry_context->retry_list_entry);
647 GNUNET_free (incoming_retry_context->retry_list_entry);
648 GNUNET_free (incoming_retry_context->msg);
649 GNUNET_free (incoming_retry_context->addr);
650 GNUNET_free (incoming_retry_context);
653 GNUNET_free (message);
659 * Function that can be used by the transport service to transmit
660 * a message using the plugin.
663 * @param target who should receive this message (ignored by UNIX)
664 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
665 * @param msgbuf_size the size of the msgbuf to send
666 * @param priority how important is the message (ignored by UNIX)
667 * @param timeout when should we time out (give up) if we can not transmit?
668 * @param session identifier used for this session (can be NULL)
669 * @param addr the addr to send the message to, needs to be a sockaddr for us
670 * @param addrlen the len of addr
671 * @param force_address not used, we had better have an address to send to
672 * because we are stateless!!
673 * @param cont continuation to call once the message has
674 * been transmitted (or if the transport is ready
675 * for the next transmission call; or if the
676 * peer disconnected...)
677 * @param cont_cls closure for cont
679 * @return the number of bytes written (may return 0 and the message can
680 * still be transmitted later!)
683 unix_plugin_send (void *cls, const struct GNUNET_PeerIdentity *target,
684 const char *msgbuf, size_t msgbuf_size, unsigned int priority,
685 struct GNUNET_TIME_Relative timeout, struct Session *session,
686 const void *addr, size_t addrlen, int force_address,
687 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
689 struct Plugin *plugin = cls;
692 GNUNET_assert (NULL == session);
695 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asked to send message to `%s'\n",
699 unix_real_send (cls, NULL, plugin->unix_sock.desc, target, msgbuf,
700 msgbuf_size, priority, timeout, addr, addrlen, cont,
703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent %d bytes to `%s'\n", sent,
706 if (sent == GNUNET_SYSERR)
713 * Demultiplexer for UNIX messages
715 * @param plugin the main plugin for this transport
716 * @param sender from which peer the message was received
717 * @param currhdr pointer to the header of the message
718 * @param un the address from which the message was received
719 * @param fromlen the length of the address
722 unix_demultiplexer (struct Plugin *plugin, struct GNUNET_PeerIdentity *sender,
723 const struct GNUNET_MessageHeader *currhdr,
724 const struct sockaddr_un *un, size_t fromlen)
726 struct GNUNET_ATS_Information ats[2];
728 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
729 ats[0].value = htonl (UNIX_DIRECT_DISTANCE);
730 ats[1] = plugin->ats_network;
731 GNUNET_break (ntohl(plugin->ats_network.value) != GNUNET_ATS_NET_UNSPECIFIED);
733 GNUNET_assert (fromlen >= sizeof (struct sockaddr_un));
736 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received message from %s\n",
739 plugin->env->receive (plugin->env->cls, sender, currhdr,
740 (const struct GNUNET_ATS_Information *) &ats, 2,
741 NULL, un->sun_path, strlen (un->sun_path) + 1);
746 * @param cls the plugin handle
747 * @param tc the scheduling context (for rescheduling this function again)
749 * We have been notified that our writeset has something to read. We don't
750 * know which socket needs to be read, so we have to check each one
751 * Then reschedule this function to be called again once more is available.
755 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
757 struct Plugin *plugin = cls;
759 struct UNIXMessage *msg;
760 struct GNUNET_PeerIdentity sender;
761 struct sockaddr_un un;
767 const struct GNUNET_MessageHeader *currhdr;
770 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
771 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
774 addrlen = sizeof (un);
775 memset (&un, 0, sizeof (un));
776 GNUNET_assert (GNUNET_NETWORK_fdset_isset
777 (tc->read_ready, plugin->unix_sock.desc));
779 GNUNET_NETWORK_socket_recvfrom (plugin->unix_sock.desc, buf, sizeof (buf),
780 (struct sockaddr *) &un, &addrlen);
782 if (ret == GNUNET_SYSERR)
784 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "recvfrom");
785 plugin->select_task =
786 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
787 GNUNET_SCHEDULER_NO_TASK,
788 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
789 NULL, &unix_plugin_select, plugin);
795 un.sun_path[0] = '/';
798 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Read %d bytes from socket %s\n", ret,
803 GNUNET_assert (AF_UNIX == (un.sun_family));
805 msg = (struct UNIXMessage *) buf;
806 csize = ntohs (msg->header.size);
807 if ((csize < sizeof (struct UNIXMessage)) || (csize > ret))
810 plugin->select_task =
811 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
812 GNUNET_SCHEDULER_NO_TASK,
813 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
814 NULL, &unix_plugin_select, plugin);
817 msgbuf = (char *) &msg[1];
818 memcpy (&sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
820 tsize = csize - sizeof (struct UNIXMessage);
821 while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
823 currhdr = (struct GNUNET_MessageHeader *) &msgbuf[offset];
824 csize = ntohs (currhdr->size);
825 if ((csize < sizeof (struct GNUNET_MessageHeader)) ||
826 (csize > tsize - offset))
831 unix_demultiplexer (plugin, &sender, currhdr, &un, sizeof (un));
834 plugin->select_task =
835 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
836 GNUNET_SCHEDULER_NO_TASK,
837 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
838 NULL, &unix_plugin_select, plugin);
842 * Create a slew of UNIX sockets. If possible, use IPv6 and IPv4.
844 * @param cls closure for server start, should be a struct Plugin *
845 * @return number of sockets created or GNUNET_SYSERR on error
848 unix_transport_server_start (void *cls)
850 struct Plugin *plugin = cls;
851 struct sockaddr *serverAddr;
853 struct sockaddr_un un;
856 memset (&un, 0, sizeof (un));
857 un.sun_family = AF_UNIX;
858 slen = strlen (plugin->unix_socket_path) + 1;
859 if (slen >= sizeof (un.sun_path))
860 slen = sizeof (un.sun_path) - 1;
862 memcpy (un.sun_path, plugin->unix_socket_path, slen);
863 un.sun_path[slen] = '\0';
864 slen = sizeof (struct sockaddr_un);
865 #if HAVE_SOCKADDR_IN_SIN_LEN
866 un.sun_len = (u_char) slen;
869 serverAddr = (struct sockaddr *) &un;
872 un.sun_path[0] = '\0';
874 plugin->ats_network = plugin->env->get_address_type (plugin->env->cls, serverAddr, addrlen);
875 plugin->unix_sock.desc =
876 GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_DGRAM, 0);
877 if (NULL == plugin->unix_sock.desc)
879 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
880 return GNUNET_SYSERR;
882 if (GNUNET_NETWORK_socket_bind (plugin->unix_sock.desc, serverAddr, addrlen)
885 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
886 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc);
887 plugin->unix_sock.desc = NULL;
888 return GNUNET_SYSERR;
891 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "unix", "Bound to `%s'\n",
894 plugin->rs = GNUNET_NETWORK_fdset_create ();
895 GNUNET_NETWORK_fdset_zero (plugin->rs);
896 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->unix_sock.desc);
898 plugin->select_task =
899 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
900 GNUNET_SCHEDULER_NO_TASK,
901 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
902 NULL, &unix_plugin_select, plugin);
908 * Function that will be called to check if a binary address for this
909 * plugin is well-formed and corresponds to an address for THIS peer
910 * (as per our configuration). Naturally, if absolutely necessary,
911 * plugins can be a bit conservative in their answer, but in general
912 * plugins should make sure that the address does not redirect
913 * traffic to a 3rd party that might try to man-in-the-middle our
916 * @param cls closure, should be our handle to the Plugin
917 * @param addr pointer to the address
918 * @param addrlen length of addr
919 * @return GNUNET_OK if this is a plausible address for this peer
920 * and transport, GNUNET_SYSERR if not
924 unix_check_address (void *cls, const void *addr, size_t addrlen)
928 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
929 "Informing transport service about my address `%s'\n",
937 * Append our port and forward the result.
940 append_port (void *cls, const char *hostname)
942 struct PrettyPrinterContext *ppc = cls;
945 if (hostname == NULL)
947 ppc->asc (ppc->asc_cls, NULL);
951 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
952 ppc->asc (ppc->asc_cls, ret);
958 * Convert the transports address to a nice, human-readable
962 * @param type name of the transport that generated the address
963 * @param addr one of the addresses of the host, NULL for the last address
964 * the specific address format depends on the transport
965 * @param addrlen length of the address
966 * @param numeric should (IP) addresses be displayed in numeric form?
967 * @param timeout after how long should we give up?
968 * @param asc function to call on each string
969 * @param asc_cls closure for asc
972 unix_plugin_address_pretty_printer (void *cls, const char *type,
973 const void *addr, size_t addrlen,
975 struct GNUNET_TIME_Relative timeout,
976 GNUNET_TRANSPORT_AddressStringCallback asc,
979 struct PrettyPrinterContext *ppc;
982 struct sockaddr_in a4;
983 struct sockaddr_in6 a6;
984 const struct IPv4UdpAddress *u4;
985 const struct IPv6UdpAddress *u6;
988 if (addrlen == sizeof (struct IPv6UdpAddress))
991 memset (&a6, 0, sizeof (a6));
992 a6.sin6_family = AF_INET6;
993 a6.sin6_port = u6->u6_port;
994 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
995 port = ntohs (u6->u6_port);
999 else if (addrlen == sizeof (struct IPv4UdpAddress))
1002 memset (&a4, 0, sizeof (a4));
1003 a4.sin_family = AF_INET;
1004 a4.sin_port = u4->u_port;
1005 a4.sin_addr.s_addr = u4->ipv4_addr;
1006 port = ntohs (u4->u_port);
1012 /* invalid address */
1013 GNUNET_break_op (0);
1014 asc (asc_cls, NULL);
1017 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1019 ppc->asc_cls = asc_cls;
1021 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
1025 * Function called for a quick conversion of the binary address to
1026 * a numeric address. Note that the caller must not free the
1027 * address and that the next call to this function is allowed
1028 * to override the address again.
1030 * @param cls closure
1031 * @param addr binary address
1032 * @param addrlen length of the address
1033 * @return string representing the same address
1036 unix_address_to_string (void *cls, const void *addr, size_t addrlen)
1038 if ((addr != NULL) && (addrlen > 0))
1039 return (const char *) addr;
1045 * Notify transport service about address
1047 * @param cls the plugin
1051 address_notification (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1053 struct Plugin *plugin = cls;
1055 plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
1056 plugin->unix_socket_path,
1057 strlen (plugin->unix_socket_path) + 1);
1061 * The exported method. Makes the core api available via a global and
1062 * returns the unix transport API.
1065 libgnunet_plugin_transport_unix_init (void *cls)
1067 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1068 unsigned long long port;
1069 struct GNUNET_TRANSPORT_PluginFunctions *api;
1070 struct Plugin *plugin;
1071 int sockets_created;
1074 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-unix", "PORT",
1076 port = UNIX_NAT_DEFAULT_PORT;
1077 plugin = GNUNET_malloc (sizeof (struct Plugin));
1078 plugin->port = port;
1080 GNUNET_asprintf (&plugin->unix_socket_path, "/tmp/unix-plugin-sock.%d",
1083 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1086 api->send = &unix_plugin_send;
1087 api->disconnect = &unix_disconnect;
1088 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1089 api->address_to_string = &unix_address_to_string;
1090 api->check_address = &unix_check_address;
1091 sockets_created = unix_transport_server_start (plugin);
1092 if (sockets_created == 0)
1093 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UNIX sockets\n"));
1095 GNUNET_SCHEDULER_add_now (address_notification, plugin);
1100 libgnunet_plugin_transport_unix_done (void *cls)
1102 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1103 struct Plugin *plugin = api->cls;
1105 unix_transport_server_stop (plugin);
1107 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1108 GNUNET_free (plugin->unix_socket_path);
1109 GNUNET_free (plugin);
1114 /* end of plugin_transport_unix.c */