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
67 GNUNET_NETWORK_STRUCT_BEGIN
70 * UNIX Message-Packet header.
77 struct GNUNET_MessageHeader header;
80 * What is the identity of the sender (GNUNET_hash of public key)
82 struct GNUNET_PeerIdentity sender;
89 * Pointer to next element.
91 struct RetryList *next;
94 * Pointer to previous element.
96 struct RetryList *prev;
99 * The actual retry context.
101 struct RetrySendContext *retry_ctx;
105 * Network format for IPv4 addresses.
107 struct IPv4UdpAddress
110 * IPv4 address, in network byte order.
112 uint32_t ipv4_addr GNUNET_PACKED;
115 * Port number, in network byte order.
117 uint16_t u_port GNUNET_PACKED;
122 * Network format for IPv6 addresses.
124 struct IPv6UdpAddress
129 struct in6_addr ipv6_addr GNUNET_PACKED;
132 * Port number, in network byte order.
134 uint16_t u6_port GNUNET_PACKED;
136 GNUNET_NETWORK_STRUCT_END
138 /* Forward definition */
141 struct PrettyPrinterContext
143 GNUNET_TRANSPORT_AddressStringCallback asc;
148 struct RetrySendContext
152 * Main plugin handle.
154 struct Plugin *plugin;
157 * Address of recipient.
172 * Size of the message.
177 * Handle to send message out on.
179 struct GNUNET_NETWORK_Handle *send_handle;
182 * Continuation to call on success or
185 GNUNET_TRANSPORT_TransmitContinuation cont;
188 * Closure for continuation.
193 * The peer the message is destined for.
195 struct GNUNET_PeerIdentity target;
198 * How long before not retrying any longer.
200 struct GNUNET_TIME_Absolute timeout;
203 * How long the last message was delayed.
205 struct GNUNET_TIME_Relative delay;
208 * The actual retry task.
210 GNUNET_SCHEDULER_TaskIdentifier retry_task;
213 * The priority of the message.
215 unsigned int priority;
218 * Entry in the DLL of retry items.
220 struct RetryList *retry_list_entry;
231 * Stored in a linked list.
233 struct PeerSession *next;
236 * Pointer to the global plugin struct.
238 struct Plugin *plugin;
241 * To whom are we talking to (set to our identity
242 * if we are still waiting for the welcome message)
244 struct GNUNET_PeerIdentity target;
247 * Address of the other peer (either based on our 'connect'
248 * call or on our 'accept' call).
253 * Length of connect_addr.
258 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
260 int expecting_welcome;
263 * From which socket do we need to send to this peer?
265 struct GNUNET_NETWORK_Handle *sock;
268 * Queue of messages for this peer, in the case that
269 * we have to await a connection...
271 struct MessageQueue *messages;
276 * Information we keep for each of our listen sockets.
278 struct UNIX_Sock_Info
283 struct GNUNET_NETWORK_Handle *desc;
286 * The port we bound to
293 * Encapsulation of all of the state of the plugin.
300 struct GNUNET_TRANSPORT_PluginEnvironment *env;
303 * Session of peers with whom we are currently connected
305 struct PeerSession *sessions;
308 * ID of task used to update our addresses when one expires.
310 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
315 GNUNET_SCHEDULER_TaskIdentifier select_task;
318 * Integer to append to unix domain socket.
325 struct GNUNET_NETWORK_FDSet *rs;
330 struct GNUNET_NETWORK_FDSet *ws;
333 * socket that we transmit all data with
335 struct UNIX_Sock_Info unix_sock;
338 * Path of our unix domain socket (/tmp/unix-plugin-PORT)
340 char *unix_socket_path;
345 struct GNUNET_ATS_Information ats_network;
351 static struct RetryList *retry_list_head;
356 static struct RetryList *retry_list_tail;
360 * Disconnect from a remote node. Clean up session if we have one for this peer
362 * @param cls closure for this call (should be handle to Plugin)
363 * @param target the peeridentity of the peer to disconnect
364 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
367 unix_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
369 /** TODO: Implement! */
374 * Shutdown the server process (stop receiving inbound traffic). Maybe
377 * @param cls Handle to the plugin for this transport
379 * @return returns the number of sockets successfully closed,
380 * should equal the number of sockets successfully opened
383 unix_transport_server_stop (void *cls)
385 struct Plugin *plugin = cls;
386 struct RetryList *pos;
388 pos = retry_list_head;
390 while (NULL != (pos = retry_list_head))
392 GNUNET_CONTAINER_DLL_remove (retry_list_head, retry_list_tail, pos);
393 if (GNUNET_SCHEDULER_NO_TASK != pos->retry_ctx->retry_task)
395 GNUNET_SCHEDULER_cancel (pos->retry_ctx->retry_task);
397 GNUNET_free (pos->retry_ctx->msg);
398 GNUNET_free (pos->retry_ctx->addr);
399 GNUNET_free (pos->retry_ctx);
403 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
405 GNUNET_SCHEDULER_cancel (plugin->select_task);
406 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
409 GNUNET_break (GNUNET_OK ==
410 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc));
411 plugin->unix_sock.desc = NULL;
418 find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer)
420 struct PeerSession *pos;
422 pos = plugin->sessions;
425 if (memcmp (&pos->target, peer, sizeof (struct GNUNET_PeerIdentity)) == 0)
433 /* Forward Declaration */
435 unix_real_send (void *cls, struct RetrySendContext *incoming_retry_context,
436 struct GNUNET_NETWORK_Handle *send_handle,
437 const struct GNUNET_PeerIdentity *target, const char *msgbuf,
438 size_t msgbuf_size, unsigned int priority,
439 struct GNUNET_TIME_Relative timeout, const void *addr,
440 size_t addrlen, GNUNET_TRANSPORT_TransmitContinuation cont,
444 * Retry sending a message.
446 * @param cls closure a struct RetrySendContext
447 * @param tc context information
450 retry_send_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
452 struct RetrySendContext *retry_ctx = cls;
454 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
456 GNUNET_free (retry_ctx->msg);
457 GNUNET_free (retry_ctx->addr);
458 GNUNET_free (retry_ctx);
462 unix_real_send (retry_ctx->plugin, retry_ctx, retry_ctx->send_handle,
463 &retry_ctx->target, retry_ctx->msg, retry_ctx->msg_size,
465 GNUNET_TIME_absolute_get_remaining (retry_ctx->timeout),
466 retry_ctx->addr, retry_ctx->addrlen, retry_ctx->cont,
467 retry_ctx->cont_cls);
472 * Actually send out the message, assume we've got the address and
473 * send_handle squared away!
476 * @param incoming_retry_context the retry context to use
477 * @param send_handle which handle to send message on
478 * @param target who should receive this message (ignored by UNIX)
479 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
480 * @param msgbuf_size the size of the msgbuf to send
481 * @param priority how important is the message (ignored by UNIX)
482 * @param timeout when should we time out (give up) if we can not transmit?
483 * @param addr the addr to send the message to, needs to be a sockaddr for us
484 * @param addrlen the len of addr
485 * @param cont continuation to call once the message has
486 * been transmitted (or if the transport is ready
487 * for the next transmission call; or if the
488 * peer disconnected...)
489 * @param cont_cls closure for cont
491 * @return the number of bytes written, -1 on errors
494 unix_real_send (void *cls, struct RetrySendContext *incoming_retry_context,
495 struct GNUNET_NETWORK_Handle *send_handle,
496 const struct GNUNET_PeerIdentity *target, const char *msgbuf,
497 size_t msgbuf_size, unsigned int priority,
498 struct GNUNET_TIME_Relative timeout, const void *addr,
499 size_t addrlen, GNUNET_TRANSPORT_TransmitContinuation cont,
502 struct Plugin *plugin = cls;
503 struct UNIXMessage *message;
504 struct RetrySendContext *retry_ctx;
509 struct sockaddr_un un;
511 struct RetryList *retry_list_entry;
514 if (send_handle == NULL)
517 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
518 "unix_real_send with send_handle NULL!\n");
520 /* failed to open send socket for AF */
522 cont (cont_cls, target, GNUNET_SYSERR);
525 if ((addr == NULL) || (addrlen == 0))
528 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
529 "unix_real_send called without address, returning!\n");
532 cont (cont_cls, target, GNUNET_SYSERR);
533 return 0; /* Can never send if we don't have an address!! */
536 /* Build the message to be sent */
537 message = GNUNET_malloc (sizeof (struct UNIXMessage) + msgbuf_size);
538 ssize = sizeof (struct UNIXMessage) + msgbuf_size;
540 message->header.size = htons (ssize);
541 message->header.type = htons (0);
542 memcpy (&message->sender, plugin->env->my_identity,
543 sizeof (struct GNUNET_PeerIdentity));
544 memcpy (&message[1], msgbuf, msgbuf_size);
546 memset (&un, 0, sizeof (un));
547 un.sun_family = AF_UNIX;
548 slen = strlen (addr) + 1;
549 if (slen >= sizeof (un.sun_path))
550 slen = sizeof (un.sun_path) - 1;
552 GNUNET_assert (slen < sizeof (un.sun_path));
553 memcpy (un.sun_path, addr, slen);
554 un.sun_path[slen] = '\0';
555 slen = sizeof (struct sockaddr_un);
557 un.sun_path[0] = '\0';
559 #if HAVE_SOCKADDR_IN_SIN_LEN
560 un.sun_len = (u_char) slen;
562 sb = (struct sockaddr *) &un;
566 sent = GNUNET_NETWORK_socket_sendto (send_handle, message, ssize, sb, sbs);
568 if ((GNUNET_SYSERR == sent) && ((errno == EAGAIN) || (errno == ENOBUFS)))
571 if ((GNUNET_SYSERR == sent) && (errno == EMSGSIZE))
574 socklen_t len = sizeof (size);
576 GNUNET_NETWORK_socket_getsockopt ((struct GNUNET_NETWORK_Handle *)
577 send_handle, SOL_SOCKET, SO_SNDBUF, &size,
583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
584 "Trying to increase socket buffer size from %i to %i for message size %i\n",
585 size, ((ssize / 1000) + 2) * 1000, ssize);
587 size = ((ssize / 1000) + 2) * 1000;
588 if (GNUNET_NETWORK_socket_setsockopt
589 ((struct GNUNET_NETWORK_Handle *) send_handle, SOL_SOCKET, SO_SNDBUF,
590 &size, sizeof (size)) == GNUNET_OK)
593 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "setsockopt");
597 if (retry == GNUNET_YES)
599 if (incoming_retry_context == NULL)
601 retry_list_entry = GNUNET_malloc (sizeof (struct RetryList));
602 retry_ctx = GNUNET_malloc (sizeof (struct RetrySendContext));
603 retry_ctx->addr = GNUNET_malloc (addrlen);
604 retry_ctx->msg = GNUNET_malloc (msgbuf_size);
605 retry_ctx->plugin = plugin;
606 memcpy (retry_ctx->addr, addr, addrlen);
607 memcpy (retry_ctx->msg, msgbuf, msgbuf_size);
608 retry_ctx->msg_size = msgbuf_size;
609 retry_ctx->addrlen = addrlen;
610 retry_ctx->send_handle = send_handle;
611 retry_ctx->cont = cont;
612 retry_ctx->cont_cls = cont_cls;
613 retry_ctx->priority = priority;
614 retry_ctx->timeout = GNUNET_TIME_relative_to_absolute (timeout);
615 memcpy (&retry_ctx->target, target, sizeof (struct GNUNET_PeerIdentity));
616 retry_ctx->delay = GNUNET_TIME_UNIT_MILLISECONDS;
617 retry_ctx->retry_list_entry = retry_list_entry;
618 retry_list_entry->retry_ctx = retry_ctx;
619 GNUNET_CONTAINER_DLL_insert (retry_list_head, retry_list_tail,
624 retry_ctx = incoming_retry_context;
625 retry_ctx->delay = GNUNET_TIME_relative_multiply (retry_ctx->delay, 2);
627 retry_ctx->retry_task =
628 GNUNET_SCHEDULER_add_delayed (retry_ctx->delay, &retry_send_message,
631 //GNUNET_log_strerror (GNUNET_ERROR_TYPE_DEBUG, "send");
632 GNUNET_free (message);
636 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
637 "UNIX transmit %u-byte message to %s (%d: %s)\n",
638 (unsigned int) ssize, GNUNET_a2s (sb, sbs), (int) sent,
639 (sent < 0) ? STRERROR (errno) : "ok");
643 if (sent == GNUNET_SYSERR)
644 cont (cont_cls, target, GNUNET_SYSERR);
647 cont (cont_cls, target, GNUNET_OK);
651 if (incoming_retry_context != NULL)
653 GNUNET_CONTAINER_DLL_remove (retry_list_head, retry_list_tail,
654 incoming_retry_context->retry_list_entry);
655 GNUNET_free (incoming_retry_context->retry_list_entry);
656 GNUNET_free (incoming_retry_context->msg);
657 GNUNET_free (incoming_retry_context->addr);
658 GNUNET_free (incoming_retry_context);
661 GNUNET_free (message);
667 * Creates a new outbound session the transport service will use to send data to the
670 * @param cls the plugin
671 * @param address the address
672 * @return the session or NULL of max connections exceeded
675 static struct Session *
676 unix_plugin_get_session (void *cls,
677 const struct GNUNET_HELLO_Address *address)
679 struct Session * s = NULL;
680 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "To be implemented\n");
686 * Function that can be used by the transport service to transmit
687 * a message using the plugin. Note that in the case of a
688 * peer disconnecting, the continuation MUST be called
689 * prior to the disconnect notification itself. This function
690 * will be called with this peer's HELLO message to initiate
691 * a fresh connection to another peer.
694 * @param session which session must be used
695 * @param msgbuf the message to transmit
696 * @param msgbuf_size number of bytes in 'msgbuf'
697 * @param priority how important is the message (most plugins will
698 * ignore message priority and just FIFO)
699 * @param to how long to wait at most for the transmission (does not
700 * require plugins to discard the message after the timeout,
701 * just advisory for the desired delay; most plugins will ignore
703 * @param cont continuation to call once the message has
704 * been transmitted (or if the transport is ready
705 * for the next transmission call; or if the
706 * peer disconnected...); can be NULL
707 * @param cont_cls closure for cont
708 * @return number of bytes used (on the physical network, with overheads);
709 * -1 on hard errors (i.e. address invalid); 0 is a legal value
710 * and does NOT mean that the message was not transmitted (DV)
713 unix_plugin_send (void *cls,
714 struct Session *session,
715 const char *msgbuf, size_t msgbuf_size,
716 unsigned int priority,
717 struct GNUNET_TIME_Relative to,
718 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
721 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "To be implemented\n");
728 * Function that can be used by the transport service to transmit
729 * a message using the plugin.
732 * @param target who should receive this message (ignored by UNIX)
733 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
734 * @param msgbuf_size the size of the msgbuf to send
735 * @param priority how important is the message (ignored by UNIX)
736 * @param timeout when should we time out (give up) if we can not transmit?
737 * @param session identifier used for this session (can be NULL)
738 * @param addr the addr to send the message to, needs to be a sockaddr for us
739 * @param addrlen the len of addr
740 * @param force_address not used, we had better have an address to send to
741 * because we are stateless!!
742 * @param cont continuation to call once the message has
743 * been transmitted (or if the transport is ready
744 * for the next transmission call; or if the
745 * peer disconnected...)
746 * @param cont_cls closure for cont
748 * @return the number of bytes written (may return 0 and the message can
749 * still be transmitted later!)
752 unix_plugin_send_old (void *cls, const struct GNUNET_PeerIdentity *target,
753 const char *msgbuf, size_t msgbuf_size, unsigned int priority,
754 struct GNUNET_TIME_Relative timeout, struct Session *session,
755 const void *addr, size_t addrlen, int force_address,
756 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
758 struct Plugin *plugin = cls;
761 GNUNET_assert (NULL == session);
764 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asked to send message to `%s'\n",
768 unix_real_send (cls, NULL, plugin->unix_sock.desc, target, msgbuf,
769 msgbuf_size, priority, timeout, addr, addrlen, cont,
772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent %d bytes to `%s'\n", sent,
775 if (sent == GNUNET_SYSERR)
782 * Demultiplexer for UNIX messages
784 * @param plugin the main plugin for this transport
785 * @param sender from which peer the message was received
786 * @param currhdr pointer to the header of the message
787 * @param un the address from which the message was received
788 * @param fromlen the length of the address
791 unix_demultiplexer (struct Plugin *plugin, struct GNUNET_PeerIdentity *sender,
792 const struct GNUNET_MessageHeader *currhdr,
793 const struct sockaddr_un *un, size_t fromlen)
795 struct GNUNET_ATS_Information ats[2];
797 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
798 ats[0].value = htonl (UNIX_DIRECT_DISTANCE);
799 ats[1] = plugin->ats_network;
800 GNUNET_break (ntohl(plugin->ats_network.value) != GNUNET_ATS_NET_UNSPECIFIED);
802 GNUNET_assert (fromlen >= sizeof (struct sockaddr_un));
805 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received message from %s\n",
808 plugin->env->receive (plugin->env->cls, sender, currhdr,
809 (const struct GNUNET_ATS_Information *) &ats, 2,
810 NULL, un->sun_path, strlen (un->sun_path) + 1);
815 unix_plugin_select_read (struct Plugin * plugin)
818 struct UNIXMessage *msg;
819 struct GNUNET_PeerIdentity sender;
820 struct sockaddr_un un;
826 const struct GNUNET_MessageHeader *currhdr;
829 addrlen = sizeof (un);
830 memset (&un, 0, sizeof (un));
833 GNUNET_NETWORK_socket_recvfrom (plugin->unix_sock.desc, buf, sizeof (buf),
834 (struct sockaddr *) &un, &addrlen);
836 if (ret == GNUNET_SYSERR)
838 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "recvfrom");
844 un.sun_path[0] = '/';
847 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Read %d bytes from socket %s\n", ret,
852 GNUNET_assert (AF_UNIX == (un.sun_family));
854 msg = (struct UNIXMessage *) buf;
855 csize = ntohs (msg->header.size);
856 if ((csize < sizeof (struct UNIXMessage)) || (csize > ret))
861 msgbuf = (char *) &msg[1];
862 memcpy (&sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
864 tsize = csize - sizeof (struct UNIXMessage);
865 while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
867 currhdr = (struct GNUNET_MessageHeader *) &msgbuf[offset];
868 csize = ntohs (currhdr->size);
869 if ((csize < sizeof (struct GNUNET_MessageHeader)) ||
870 (csize > tsize - offset))
875 unix_demultiplexer (plugin, &sender, currhdr, &un, sizeof (un));
881 unix_plugin_select_write (struct Plugin * plugin)
888 * @param cls the plugin handle
889 * @param tc the scheduling context (for rescheduling this function again)
891 * We have been notified that our writeset has something to read. We don't
892 * know which socket needs to be read, so we have to check each one
893 * Then reschedule this function to be called again once more is available.
897 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
899 struct Plugin *plugin = cls;
901 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
902 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
906 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
908 GNUNET_assert (GNUNET_NETWORK_fdset_isset
909 (tc->write_ready, plugin->unix_sock.desc));
910 unix_plugin_select_write (plugin);
913 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
915 GNUNET_assert (GNUNET_NETWORK_fdset_isset
916 (tc->read_ready, plugin->unix_sock.desc));
917 unix_plugin_select_read (plugin);
920 plugin->select_task =
921 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
922 GNUNET_SCHEDULER_NO_TASK,
923 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
924 plugin->ws, &unix_plugin_select, plugin);
928 * Create a slew of UNIX sockets. If possible, use IPv6 and IPv4.
930 * @param cls closure for server start, should be a struct Plugin *
931 * @return number of sockets created or GNUNET_SYSERR on error
934 unix_transport_server_start (void *cls)
936 struct Plugin *plugin = cls;
937 struct sockaddr *serverAddr;
939 struct sockaddr_un un;
942 memset (&un, 0, sizeof (un));
943 un.sun_family = AF_UNIX;
944 slen = strlen (plugin->unix_socket_path) + 1;
945 if (slen >= sizeof (un.sun_path))
946 slen = sizeof (un.sun_path) - 1;
948 memcpy (un.sun_path, plugin->unix_socket_path, slen);
949 un.sun_path[slen] = '\0';
950 slen = sizeof (struct sockaddr_un);
951 #if HAVE_SOCKADDR_IN_SIN_LEN
952 un.sun_len = (u_char) slen;
955 serverAddr = (struct sockaddr *) &un;
958 un.sun_path[0] = '\0';
960 plugin->ats_network = plugin->env->get_address_type (plugin->env->cls, serverAddr, addrlen);
961 plugin->unix_sock.desc =
962 GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_DGRAM, 0);
963 if (NULL == plugin->unix_sock.desc)
965 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
966 return GNUNET_SYSERR;
968 if (GNUNET_NETWORK_socket_bind (plugin->unix_sock.desc, serverAddr, addrlen)
971 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
972 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc);
973 plugin->unix_sock.desc = NULL;
974 return GNUNET_SYSERR;
977 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "unix", "Bound to `%s'\n",
980 plugin->rs = GNUNET_NETWORK_fdset_create ();
981 plugin->ws = GNUNET_NETWORK_fdset_create ();
982 GNUNET_NETWORK_fdset_zero (plugin->rs);
983 GNUNET_NETWORK_fdset_zero (plugin->ws);
984 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->unix_sock.desc);
985 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->unix_sock.desc);
987 plugin->select_task =
988 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
989 GNUNET_SCHEDULER_NO_TASK,
990 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
991 plugin->ws, &unix_plugin_select, plugin);
997 * Function that will be called to check if a binary address for this
998 * plugin is well-formed and corresponds to an address for THIS peer
999 * (as per our configuration). Naturally, if absolutely necessary,
1000 * plugins can be a bit conservative in their answer, but in general
1001 * plugins should make sure that the address does not redirect
1002 * traffic to a 3rd party that might try to man-in-the-middle our
1005 * @param cls closure, should be our handle to the Plugin
1006 * @param addr pointer to the address
1007 * @param addrlen length of addr
1008 * @return GNUNET_OK if this is a plausible address for this peer
1009 * and transport, GNUNET_SYSERR if not
1013 unix_check_address (void *cls, const void *addr, size_t addrlen)
1017 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1018 "Informing transport service about my address `%s'\n",
1026 * Append our port and forward the result.
1029 append_port (void *cls, const char *hostname)
1031 struct PrettyPrinterContext *ppc = cls;
1034 if (hostname == NULL)
1036 ppc->asc (ppc->asc_cls, NULL);
1040 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1041 ppc->asc (ppc->asc_cls, ret);
1047 * Convert the transports address to a nice, human-readable
1050 * @param cls closure
1051 * @param type name of the transport that generated the address
1052 * @param addr one of the addresses of the host, NULL for the last address
1053 * the specific address format depends on the transport
1054 * @param addrlen length of the address
1055 * @param numeric should (IP) addresses be displayed in numeric form?
1056 * @param timeout after how long should we give up?
1057 * @param asc function to call on each string
1058 * @param asc_cls closure for asc
1061 unix_plugin_address_pretty_printer (void *cls, const char *type,
1062 const void *addr, size_t addrlen,
1064 struct GNUNET_TIME_Relative timeout,
1065 GNUNET_TRANSPORT_AddressStringCallback asc,
1068 struct PrettyPrinterContext *ppc;
1071 struct sockaddr_in a4;
1072 struct sockaddr_in6 a6;
1073 const struct IPv4UdpAddress *u4;
1074 const struct IPv6UdpAddress *u6;
1077 if (addrlen == sizeof (struct IPv6UdpAddress))
1080 memset (&a6, 0, sizeof (a6));
1081 a6.sin6_family = AF_INET6;
1082 a6.sin6_port = u6->u6_port;
1083 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
1084 port = ntohs (u6->u6_port);
1088 else if (addrlen == sizeof (struct IPv4UdpAddress))
1091 memset (&a4, 0, sizeof (a4));
1092 a4.sin_family = AF_INET;
1093 a4.sin_port = u4->u_port;
1094 a4.sin_addr.s_addr = u4->ipv4_addr;
1095 port = ntohs (u4->u_port);
1101 /* invalid address */
1102 GNUNET_break_op (0);
1103 asc (asc_cls, NULL);
1106 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1108 ppc->asc_cls = asc_cls;
1110 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
1114 * Function called for a quick conversion of the binary address to
1115 * a numeric address. Note that the caller must not free the
1116 * address and that the next call to this function is allowed
1117 * to override the address again.
1119 * @param cls closure
1120 * @param addr binary address
1121 * @param addrlen length of the address
1122 * @return string representing the same address
1125 unix_address_to_string (void *cls, const void *addr, size_t addrlen)
1127 if ((addr != NULL) && (addrlen > 0))
1128 return (const char *) addr;
1134 * Notify transport service about address
1136 * @param cls the plugin
1140 address_notification (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1142 struct Plugin *plugin = cls;
1144 plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
1145 plugin->unix_socket_path,
1146 strlen (plugin->unix_socket_path) + 1);
1150 * The exported method. Makes the core api available via a global and
1151 * returns the unix transport API.
1154 libgnunet_plugin_transport_unix_init (void *cls)
1156 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1157 unsigned long long port;
1158 struct GNUNET_TRANSPORT_PluginFunctions *api;
1159 struct Plugin *plugin;
1160 int sockets_created;
1163 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-unix", "PORT",
1165 port = UNIX_NAT_DEFAULT_PORT;
1166 plugin = GNUNET_malloc (sizeof (struct Plugin));
1167 plugin->port = port;
1169 GNUNET_asprintf (&plugin->unix_socket_path, "/tmp/unix-plugin-sock.%d",
1172 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1175 api->get_session = &unix_plugin_get_session;
1176 api->send_with_session = &unix_plugin_send;
1177 api->send = &unix_plugin_send_old;
1178 api->disconnect = &unix_disconnect;
1179 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1180 api->address_to_string = &unix_address_to_string;
1181 api->check_address = &unix_check_address;
1182 sockets_created = unix_transport_server_start (plugin);
1183 if (sockets_created == 0)
1184 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UNIX sockets\n"));
1186 GNUNET_SCHEDULER_add_now (address_notification, plugin);
1191 libgnunet_plugin_transport_unix_done (void *cls)
1193 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1194 struct Plugin *plugin = api->cls;
1196 unix_transport_server_stop (plugin);
1198 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1199 GNUNET_NETWORK_fdset_destroy (plugin->ws);
1200 GNUNET_free (plugin->unix_socket_path);
1201 GNUNET_free (plugin);
1206 /* end of plugin_transport_unix.c */