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_EXTRALOGGING
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;
90 struct GNUNET_PeerIdentity target;
93 struct UNIXMessageWrapper
95 struct UNIXMessageWrapper *next;
96 struct UNIXMessageWrapper *prev;
98 struct UNIXMessage * msg;
101 struct GNUNET_TIME_Relative timeout;
102 unsigned int priority;
104 struct Session *session;
105 GNUNET_TRANSPORT_TransmitContinuation cont;
109 /* Forward definition */
120 * Stored in a linked list.
122 struct PeerSession *next;
125 * Pointer to the global plugin struct.
127 struct Plugin *plugin;
130 * To whom are we talking to (set to our identity
131 * if we are still waiting for the welcome message)
133 struct GNUNET_PeerIdentity target;
136 * Address of the other peer (either based on our 'connect'
137 * call or on our 'accept' call).
142 * Length of connect_addr.
147 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
149 int expecting_welcome;
152 * From which socket do we need to send to this peer?
154 struct GNUNET_NETWORK_Handle *sock;
157 * Queue of messages for this peer, in the case that
158 * we have to await a connection...
160 struct MessageQueue *messages;
165 * Information we keep for each of our listen sockets.
167 struct UNIX_Sock_Info
172 struct GNUNET_NETWORK_Handle *desc;
175 * The port we bound to
182 * Encapsulation of all of the state of the plugin.
189 struct GNUNET_TRANSPORT_PluginEnvironment *env;
192 * Session of peers with whom we are currently connected
194 struct PeerSession *sessions;
199 struct GNUNET_CONTAINER_MultiHashMap *session_map;
202 * ID of task used to update our addresses when one expires.
204 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
209 GNUNET_SCHEDULER_TaskIdentifier select_task;
212 * Integer to append to unix domain socket.
219 struct GNUNET_NETWORK_FDSet *rs;
224 struct GNUNET_NETWORK_FDSet *ws;
229 * socket that we transmit all data with
231 struct UNIX_Sock_Info unix_sock;
234 * Path of our unix domain socket (/tmp/unix-plugin-PORT)
236 char *unix_socket_path;
238 struct UNIXMessageWrapper *msg_head;
239 struct UNIXMessageWrapper *msg_tail;
244 struct GNUNET_ATS_Information ats_network;
246 unsigned int bytes_in_queue;
251 get_session_delete_it (void *cls, const GNUNET_HashCode * key, void *value)
253 struct Session *s = value;
254 struct Plugin *plugin = cls;
255 GNUNET_assert (plugin != NULL);
258 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Deleting session for peer `%s' `%s' \n", GNUNET_i2s (&s->target), s->addr);
261 plugin->env->session_end (plugin->env->cls, &s->target, s);
263 GNUNET_assert (GNUNET_YES ==
264 GNUNET_CONTAINER_multihashmap_remove(plugin->session_map, &s->target.hashPubKey, s));
266 GNUNET_STATISTICS_set(plugin->env->stats,
267 "# UNIX sessions active",
268 GNUNET_CONTAINER_multihashmap_size(plugin->session_map),
277 * Disconnect from a remote node. Clean up session if we have one for this peer
279 * @param cls closure for this call (should be handle to Plugin)
280 * @param target the peeridentity of the peer to disconnect
281 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
284 unix_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
286 struct Plugin *plugin = cls;
287 GNUNET_assert (plugin != NULL);
289 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->session_map, &target->hashPubKey, &get_session_delete_it, plugin);
294 * Shutdown the server process (stop receiving inbound traffic). Maybe
297 * @param cls Handle to the plugin for this transport
299 * @return returns the number of sockets successfully closed,
300 * should equal the number of sockets successfully opened
303 unix_transport_server_stop (void *cls)
305 struct Plugin *plugin = cls;
307 struct UNIXMessageWrapper * msgw = plugin->msg_head;
309 while (NULL != (msgw = plugin->msg_head))
311 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
312 if (msgw->cont != NULL)
313 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR);
314 GNUNET_free (msgw->msg);
318 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
320 GNUNET_SCHEDULER_cancel (plugin->select_task);
321 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
324 GNUNET_break (GNUNET_OK ==
325 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc));
326 plugin->unix_sock.desc = NULL;
327 plugin->with_ws = GNUNET_NO;
333 find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer)
335 struct PeerSession *pos;
337 pos = plugin->sessions;
340 if (memcmp (&pos->target, peer, sizeof (struct GNUNET_PeerIdentity)) == 0)
350 * Actually send out the message, assume we've got the address and
351 * send_handle squared away!
354 * @param send_handle which handle to send message on
355 * @param target who should receive this message (ignored by UNIX)
356 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
357 * @param msgbuf_size the size of the msgbuf to send
358 * @param priority how important is the message (ignored by UNIX)
359 * @param timeout when should we time out (give up) if we can not transmit?
360 * @param addr the addr to send the message to, needs to be a sockaddr for us
361 * @param addrlen the len of addr
362 * @param cont continuation to call once the message has
363 * been transmitted (or if the transport is ready
364 * for the next transmission call; or if the
365 * peer disconnected...)
366 * @param cont_cls closure for cont
368 * @return the number of bytes written, -1 on errors
371 unix_real_send (void *cls,
372 struct GNUNET_NETWORK_Handle *send_handle,
373 const struct GNUNET_PeerIdentity *target, const char *msgbuf,
374 size_t msgbuf_size, unsigned int priority,
375 struct GNUNET_TIME_Relative timeout, const void *addr,
376 size_t addrlen, GNUNET_TRANSPORT_TransmitContinuation cont,
383 struct sockaddr_un un;
387 if (send_handle == NULL)
390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
391 "unix_real_send with send_handle NULL!\n");
393 /* failed to open send socket for AF */
395 cont (cont_cls, target, GNUNET_SYSERR);
398 if ((addr == NULL) || (addrlen == 0))
401 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
402 "unix_real_send called without address, returning!\n");
405 cont (cont_cls, target, GNUNET_SYSERR);
406 return 0; /* Can never send if we don't have an address!! */
409 memset (&un, 0, sizeof (un));
410 un.sun_family = AF_UNIX;
411 slen = strlen (addr) + 1;
412 if (slen >= sizeof (un.sun_path))
413 slen = sizeof (un.sun_path) - 1;
415 GNUNET_assert (slen < sizeof (un.sun_path));
416 memcpy (un.sun_path, addr, slen);
417 un.sun_path[slen] = '\0';
418 slen = sizeof (struct sockaddr_un);
420 un.sun_path[0] = '\0';
422 #if HAVE_SOCKADDR_IN_SIN_LEN
423 un.sun_len = (u_char) slen;
425 sb = (struct sockaddr *) &un;
428 sent = GNUNET_NETWORK_socket_sendto (send_handle, msgbuf, msgbuf_size, sb, sbs);
430 if ((GNUNET_SYSERR == sent) && ((errno == EAGAIN) || (errno == ENOBUFS)))
433 if ((GNUNET_SYSERR == sent) && (errno == EMSGSIZE))
436 socklen_t len = sizeof (size);
438 GNUNET_NETWORK_socket_getsockopt ((struct GNUNET_NETWORK_Handle *)
439 send_handle, SOL_SOCKET, SO_SNDBUF, &size,
442 if (size < msgbuf_size)
444 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
445 "Trying to increase socket buffer size from %i to %i for message size %i\n",
446 size, ((msgbuf_size / 1000) + 2) * 1000, msgbuf_size);
447 size = ((msgbuf_size / 1000) + 2) * 1000;
448 if (GNUNET_NETWORK_socket_setsockopt
449 ((struct GNUNET_NETWORK_Handle *) send_handle, SOL_SOCKET, SO_SNDBUF,
450 &size, sizeof (size)) == GNUNET_OK)
452 sent = GNUNET_NETWORK_socket_sendto (send_handle, msgbuf, msgbuf_size, sb, sbs);
456 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "setsockopt");
462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
463 "UNIX transmit %u-byte message to %s (%d: %s)\n",
464 (unsigned int) msgbuf_size, GNUNET_a2s (sb, sbs), (int) sent,
465 (sent < 0) ? STRERROR (errno) : "ok");
467 /* Calling continuation */
470 if ((sent == GNUNET_SYSERR) && (retry == GNUNET_NO))
471 cont (cont_cls, target, GNUNET_SYSERR);
473 cont (cont_cls, target, GNUNET_OK);
476 /* return number of bytes successfully sent */
479 /* failed and retry: return 0 */
480 if ((GNUNET_SYSERR == sent) && (retry == GNUNET_YES))
482 /* failed and no retry: return -1 */
483 if ((GNUNET_SYSERR == sent) && (retry == GNUNET_NO))
497 get_session_it (void *cls, const GNUNET_HashCode * key, void *value)
499 struct gsi_ctx *gsi = cls;
500 struct Session *s = value;
503 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Comparing session %s %s\n", gsi->address, s->addr);
505 if ((gsi->addrlen == s->addrlen) &&
506 (0 == memcmp (gsi->address, s->addr, s->addrlen)))
515 * Creates a new outbound session the transport service will use to send data to the
518 * @param cls the plugin
519 * @param address the address
520 * @return the session or NULL of max connections exceeded
522 static struct Session *
523 unix_plugin_get_session (void *cls,
524 const struct GNUNET_HELLO_Address *address)
526 struct Session * s = NULL;
527 struct Plugin *plugin = cls;
531 GNUNET_assert (plugin != NULL);
532 GNUNET_assert (address != NULL);
534 /* Check if already existing */
535 gsi.address = (char *) address->address;
536 gsi.addrlen = address->address_length;
538 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->session_map, &address->peer.hashPubKey, &get_session_it, &gsi);
542 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found existing session\n");
547 /* Create a new session */
549 s = GNUNET_malloc (sizeof (struct Session) + address->address_length);
551 s->addrlen = address->address_length;
552 memcpy(s->addr, address->address, s->addrlen);
553 memcpy(&s->target, &address->peer, sizeof (struct GNUNET_PeerIdentity));
555 GNUNET_CONTAINER_multihashmap_put (plugin->session_map,
556 &address->peer.hashPubKey, s,
557 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
559 GNUNET_STATISTICS_set(plugin->env->stats,
560 "# UNIX sessions active",
561 GNUNET_CONTAINER_multihashmap_size(plugin->session_map),
565 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Creating new session\n");
572 * @param cls the plugin handle
573 * @param tc the scheduling context (for rescheduling this function again)
575 * We have been notified that our writeset has something to read. We don't
576 * know which socket needs to be read, so we have to check each one
577 * Then reschedule this function to be called again once more is available.
581 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
584 * Function that can be used by the transport service to transmit
585 * a message using the plugin. Note that in the case of a
586 * peer disconnecting, the continuation MUST be called
587 * prior to the disconnect notification itself. This function
588 * will be called with this peer's HELLO message to initiate
589 * a fresh connection to another peer.
592 * @param session which session must be used
593 * @param msgbuf the message to transmit
594 * @param msgbuf_size number of bytes in 'msgbuf'
595 * @param priority how important is the message (most plugins will
596 * ignore message priority and just FIFO)
597 * @param to how long to wait at most for the transmission (does not
598 * require plugins to discard the message after the timeout,
599 * just advisory for the desired delay; most plugins will ignore
601 * @param cont continuation to call once the message has
602 * been transmitted (or if the transport is ready
603 * for the next transmission call; or if the
604 * peer disconnected...); can be NULL
605 * @param cont_cls closure for cont
606 * @return number of bytes used (on the physical network, with overheads);
607 * -1 on hard errors (i.e. address invalid); 0 is a legal value
608 * and does NOT mean that the message was not transmitted (DV)
611 unix_plugin_send (void *cls,
612 struct Session *session,
613 const char *msgbuf, size_t msgbuf_size,
614 unsigned int priority,
615 struct GNUNET_TIME_Relative to,
616 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
618 struct Plugin *plugin = cls;
619 struct UNIXMessageWrapper *wrapper;
620 struct UNIXMessage *message;
623 GNUNET_assert (plugin != NULL);
624 GNUNET_assert (session != NULL);
626 if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_contains_value(plugin->session_map,
627 &session->target.hashPubKey, session))
630 return GNUNET_SYSERR;
633 ssize = sizeof (struct UNIXMessage) + msgbuf_size;
634 message = GNUNET_malloc (sizeof (struct UNIXMessage) + msgbuf_size);
635 message->header.size = htons (ssize);
636 message->header.type = htons (0);
637 memcpy (&message->sender, plugin->env->my_identity,
638 sizeof (struct GNUNET_PeerIdentity));
639 memcpy (&message[1], msgbuf, msgbuf_size);
642 wrapper = GNUNET_malloc (sizeof (struct UNIXMessageWrapper));
643 wrapper->msg = message;
644 wrapper->msgsize = ssize;
645 wrapper->priority = priority;
646 wrapper->timeout = to;
647 wrapper->cont = cont;
648 wrapper->cont_cls = cont_cls;
649 wrapper->session = session;
651 GNUNET_CONTAINER_DLL_insert(plugin->msg_head, plugin->msg_tail, wrapper);
653 plugin->bytes_in_queue += ssize;
654 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX bytes in send queue",
655 plugin->bytes_in_queue, GNUNET_NO);
658 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent %d bytes to `%s'\n", ssize,
659 (char *) session->addr);
662 if (plugin->with_ws == GNUNET_NO)
664 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
665 GNUNET_SCHEDULER_cancel(plugin->select_task);
667 plugin->select_task =
668 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
669 GNUNET_TIME_UNIT_FOREVER_REL,
672 &unix_plugin_select, plugin);
673 plugin->with_ws = GNUNET_YES;
680 * Demultiplexer for UNIX messages
682 * @param plugin the main plugin for this transport
683 * @param sender from which peer the message was received
684 * @param currhdr pointer to the header of the message
685 * @param un the address from which the message was received
686 * @param fromlen the length of the address
689 unix_demultiplexer (struct Plugin *plugin, struct GNUNET_PeerIdentity *sender,
690 const struct GNUNET_MessageHeader *currhdr,
691 const struct sockaddr_un *un, size_t fromlen)
693 struct GNUNET_ATS_Information ats[2];
695 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
696 ats[0].value = htonl (UNIX_DIRECT_DISTANCE);
697 ats[1] = plugin->ats_network;
698 GNUNET_break (ntohl(plugin->ats_network.value) != GNUNET_ATS_NET_UNSPECIFIED);
700 GNUNET_assert (fromlen >= sizeof (struct sockaddr_un));
703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received message from %s\n",
706 plugin->env->receive (plugin->env->cls, sender, currhdr,
707 (const struct GNUNET_ATS_Information *) &ats, 2,
708 NULL, un->sun_path, strlen (un->sun_path) + 1);
713 unix_plugin_select_read (struct Plugin * plugin)
715 char buf[65536] GNUNET_ALIGN;
716 struct UNIXMessage *msg;
717 struct GNUNET_PeerIdentity sender;
718 struct sockaddr_un un;
724 const struct GNUNET_MessageHeader *currhdr;
727 addrlen = sizeof (un);
728 memset (&un, 0, sizeof (un));
731 GNUNET_NETWORK_socket_recvfrom (plugin->unix_sock.desc, buf, sizeof (buf),
732 (struct sockaddr *) &un, &addrlen);
734 if ((GNUNET_SYSERR == ret) && ((errno == EAGAIN) || (errno == ENOBUFS)))
737 if (ret == GNUNET_SYSERR)
739 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "recvfrom");
745 un.sun_path[0] = '/';
748 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Read %d bytes from socket %s\n", ret,
753 GNUNET_assert (AF_UNIX == (un.sun_family));
755 msg = (struct UNIXMessage *) buf;
756 csize = ntohs (msg->header.size);
757 if ((csize < sizeof (struct UNIXMessage)) || (csize > ret))
762 msgbuf = (char *) &msg[1];
763 memcpy (&sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
765 tsize = csize - sizeof (struct UNIXMessage);
766 while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
768 currhdr = (struct GNUNET_MessageHeader *) &msgbuf[offset];
769 csize = ntohs (currhdr->size);
770 if ((csize < sizeof (struct GNUNET_MessageHeader)) ||
771 (csize > tsize - offset))
776 unix_demultiplexer (plugin, &sender, currhdr, &un, sizeof (un));
782 unix_plugin_select_write (struct Plugin * plugin)
785 struct UNIXMessageWrapper * msgw = plugin->msg_head;
787 sent = unix_real_send (plugin,
788 plugin->unix_sock.desc,
789 &msgw->session->target,
790 (const char *) msgw->msg,
795 msgw->session->addrlen,
796 msgw->cont, msgw->cont_cls);
798 /* successfully sent bytes */
801 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, msgw);
803 GNUNET_assert (plugin->bytes_in_queue > msgw->msgsize);
804 plugin->bytes_in_queue -= msgw->msgsize;
805 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX bytes in send queue",
806 plugin->bytes_in_queue, GNUNET_NO);
808 GNUNET_free (msgw->msg);
813 /* failed and no retry */
816 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, msgw);
818 GNUNET_assert (plugin->bytes_in_queue > msgw->msgsize);
819 plugin->bytes_in_queue -= msgw->msgsize;
820 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX bytes in send queue",
821 plugin->bytes_in_queue, GNUNET_NO);
823 GNUNET_free (msgw->msg);
828 /* failed and retry */
834 * @param cls the plugin handle
835 * @param tc the scheduling context (for rescheduling this function again)
837 * We have been notified that our writeset has something to read. We don't
838 * know which socket needs to be read, so we have to check each one
839 * Then reschedule this function to be called again once more is available.
843 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
845 struct Plugin *plugin = cls;
847 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
848 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
851 plugin->with_ws = GNUNET_NO;
852 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
854 GNUNET_assert (GNUNET_NETWORK_fdset_isset
855 (tc->write_ready, plugin->unix_sock.desc));
856 if (plugin->msg_head != NULL)
857 unix_plugin_select_write (plugin);
860 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
862 GNUNET_assert (GNUNET_NETWORK_fdset_isset
863 (tc->read_ready, plugin->unix_sock.desc));
864 unix_plugin_select_read (plugin);
867 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
868 GNUNET_SCHEDULER_cancel (plugin->select_task);
869 plugin->select_task =
870 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
871 GNUNET_TIME_UNIT_FOREVER_REL,
873 (plugin->msg_head != NULL) ? plugin->ws : NULL,
874 &unix_plugin_select, plugin);
875 if (plugin->msg_head != NULL)
876 plugin->with_ws = GNUNET_YES;
880 * Create a slew of UNIX sockets. If possible, use IPv6 and IPv4.
882 * @param cls closure for server start, should be a struct Plugin *
883 * @return number of sockets created or GNUNET_SYSERR on error
886 unix_transport_server_start (void *cls)
888 struct Plugin *plugin = cls;
889 struct sockaddr *serverAddr;
891 struct sockaddr_un un;
894 memset (&un, 0, sizeof (un));
895 un.sun_family = AF_UNIX;
896 slen = strlen (plugin->unix_socket_path) + 1;
897 if (slen >= sizeof (un.sun_path))
898 slen = sizeof (un.sun_path) - 1;
900 memcpy (un.sun_path, plugin->unix_socket_path, slen);
901 un.sun_path[slen] = '\0';
902 slen = sizeof (struct sockaddr_un);
903 #if HAVE_SOCKADDR_IN_SIN_LEN
904 un.sun_len = (u_char) slen;
907 serverAddr = (struct sockaddr *) &un;
910 un.sun_path[0] = '\0';
912 plugin->ats_network = plugin->env->get_address_type (plugin->env->cls, serverAddr, addrlen);
913 plugin->unix_sock.desc =
914 GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_DGRAM, 0);
915 if (NULL == plugin->unix_sock.desc)
917 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
918 return GNUNET_SYSERR;
920 if (GNUNET_NETWORK_socket_bind (plugin->unix_sock.desc, serverAddr, addrlen)
923 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
924 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc);
925 plugin->unix_sock.desc = NULL;
926 return GNUNET_SYSERR;
929 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "unix", "Bound to `%s'\n",
932 plugin->rs = GNUNET_NETWORK_fdset_create ();
933 plugin->ws = GNUNET_NETWORK_fdset_create ();
934 GNUNET_NETWORK_fdset_zero (plugin->rs);
935 GNUNET_NETWORK_fdset_zero (plugin->ws);
936 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->unix_sock.desc);
937 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->unix_sock.desc);
939 plugin->select_task =
940 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
941 GNUNET_TIME_UNIT_FOREVER_REL,
944 &unix_plugin_select, plugin);
945 plugin->with_ws = GNUNET_NO;
952 * Function that will be called to check if a binary address for this
953 * plugin is well-formed and corresponds to an address for THIS peer
954 * (as per our configuration). Naturally, if absolutely necessary,
955 * plugins can be a bit conservative in their answer, but in general
956 * plugins should make sure that the address does not redirect
957 * traffic to a 3rd party that might try to man-in-the-middle our
960 * @param cls closure, should be our handle to the Plugin
961 * @param addr pointer to the address
962 * @param addrlen length of addr
963 * @return GNUNET_OK if this is a plausible address for this peer
964 * and transport, GNUNET_SYSERR if not
968 unix_check_address (void *cls, const void *addr, size_t addrlen)
972 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
973 "Informing transport service about my address `%s'\n",
981 * Convert the transports address to a nice, human-readable
985 * @param type name of the transport that generated the address
986 * @param addr one of the addresses of the host, NULL for the last address
987 * the specific address format depends on the transport
988 * @param addrlen length of the address
989 * @param numeric should (IP) addresses be displayed in numeric form?
990 * @param timeout after how long should we give up?
991 * @param asc function to call on each string
992 * @param asc_cls closure for asc
995 unix_plugin_address_pretty_printer (void *cls, const char *type,
996 const void *addr, size_t addrlen,
998 struct GNUNET_TIME_Relative timeout,
999 GNUNET_TRANSPORT_AddressStringCallback asc,
1002 if ((addr != NULL) && (addrlen > 0))
1003 asc (asc_cls, (const char *) addr);
1007 asc (asc_cls, "Invalid UNIX address");
1013 * Function called to convert a string address to
1016 * @param cls closure ('struct Plugin*')
1017 * @param addr string address
1018 * @param addrlen length of the address
1019 * @param buf location to store the buffer
1020 * If the function returns GNUNET_SYSERR, its contents are undefined.
1021 * @param added length of created address
1022 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
1025 unix_string_to_address (void *cls, const char *addr, uint16_t addrlen,
1026 void **buf, size_t *added)
1028 if ((NULL == addr) || (addrlen == 0))
1031 return GNUNET_SYSERR;
1034 if ((strlen (addr) + 1) != addrlen)
1037 return GNUNET_SYSERR;
1040 (*buf) = GNUNET_strdup (addr);
1041 (*added) = strlen (addr) + 1;
1049 * Function called for a quick conversion of the binary address to
1050 * a numeric address. Note that the caller must not free the
1051 * address and that the next call to this function is allowed
1052 * to override the address again.
1054 * @param cls closure
1055 * @param addr binary address
1056 * @param addrlen length of the address
1057 * @return string representing the same address
1060 unix_address_to_string (void *cls, const void *addr, size_t addrlen)
1062 if ((addr != NULL) && (addrlen > 0))
1063 return (const char *) addr;
1069 * Notify transport service about address
1071 * @param cls the plugin
1075 address_notification (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1077 struct Plugin *plugin = cls;
1079 plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
1080 plugin->unix_socket_path,
1081 strlen (plugin->unix_socket_path) + 1);
1085 * The exported method. Makes the core api available via a global and
1086 * returns the unix transport API.
1089 libgnunet_plugin_transport_unix_init (void *cls)
1091 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1092 unsigned long long port;
1093 struct GNUNET_TRANSPORT_PluginFunctions *api;
1094 struct Plugin *plugin;
1095 int sockets_created;
1097 if (NULL == env->receive)
1099 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
1100 initialze the plugin or the API */
1101 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1103 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1104 api->address_to_string = &unix_address_to_string;
1105 api->string_to_address = &unix_string_to_address;
1108 GNUNET_assert( NULL != env->stats);
1111 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-unix", "PORT",
1113 port = UNIX_NAT_DEFAULT_PORT;
1114 plugin = GNUNET_malloc (sizeof (struct Plugin));
1115 plugin->port = port;
1117 GNUNET_asprintf (&plugin->unix_socket_path, "/tmp/unix-plugin-sock.%d",
1120 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1123 api->get_session = &unix_plugin_get_session;
1124 api->send = &unix_plugin_send;
1125 api->disconnect = &unix_disconnect;
1126 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1127 api->address_to_string = &unix_address_to_string;
1128 api->check_address = &unix_check_address;
1129 api->string_to_address = &unix_string_to_address;
1130 sockets_created = unix_transport_server_start (plugin);
1131 if (sockets_created == 0)
1132 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UNIX sockets\n"));
1134 plugin->session_map = GNUNET_CONTAINER_multihashmap_create(10);
1136 GNUNET_SCHEDULER_add_now (address_notification, plugin);
1141 libgnunet_plugin_transport_unix_done (void *cls)
1143 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1144 struct Plugin *plugin = api->cls;
1151 unix_transport_server_stop (plugin);
1153 GNUNET_CONTAINER_multihashmap_iterate (plugin->session_map, &get_session_delete_it, plugin);
1154 GNUNET_CONTAINER_multihashmap_destroy (plugin->session_map);
1156 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1157 GNUNET_NETWORK_fdset_destroy (plugin->ws);
1158 GNUNET_free (plugin->unix_socket_path);
1159 GNUNET_free (plugin);
1164 /* end of plugin_transport_unix.c */