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"
48 * Transport cost to peer, always 1 for UNIX (direct connection)
50 #define UNIX_DIRECT_DISTANCE 1
52 #define DEFAULT_NAT_PORT 0
55 * How long until we give up on transmitting the welcome message?
57 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
60 * Starting port for listening and sending, eventually a config value
62 #define UNIX_NAT_DEFAULT_PORT 22086
64 GNUNET_NETWORK_STRUCT_BEGIN
67 * UNIX Message-Packet header.
74 struct GNUNET_MessageHeader header;
77 * What is the identity of the sender (GNUNET_hash of public key)
79 struct GNUNET_PeerIdentity sender;
87 struct GNUNET_PeerIdentity target;
90 struct UNIXMessageWrapper
92 struct UNIXMessageWrapper *next;
93 struct UNIXMessageWrapper *prev;
95 struct UNIXMessage * msg;
98 struct GNUNET_TIME_Relative timeout;
99 unsigned int priority;
101 struct Session *session;
102 GNUNET_TRANSPORT_TransmitContinuation cont;
106 /* Forward definition */
117 * Stored in a linked list.
119 struct PeerSession *next;
122 * Pointer to the global plugin struct.
124 struct Plugin *plugin;
127 * To whom are we talking to (set to our identity
128 * if we are still waiting for the welcome message)
130 struct GNUNET_PeerIdentity target;
133 * Address of the other peer (either based on our 'connect'
134 * call or on our 'accept' call).
139 * Length of connect_addr.
144 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
146 int expecting_welcome;
149 * From which socket do we need to send to this peer?
151 struct GNUNET_NETWORK_Handle *sock;
154 * Queue of messages for this peer, in the case that
155 * we have to await a connection...
157 struct MessageQueue *messages;
162 * Information we keep for each of our listen sockets.
164 struct UNIX_Sock_Info
169 struct GNUNET_NETWORK_Handle *desc;
172 * The port we bound to
179 * Encapsulation of all of the state of the plugin.
186 struct GNUNET_TRANSPORT_PluginEnvironment *env;
191 struct GNUNET_CONTAINER_MultiHashMap *session_map;
194 * ID of task used to update our addresses when one expires.
196 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
201 GNUNET_SCHEDULER_TaskIdentifier select_task;
204 * Integer to append to unix domain socket.
211 struct GNUNET_NETWORK_FDSet *rs;
216 struct GNUNET_NETWORK_FDSet *ws;
221 * socket that we transmit all data with
223 struct UNIX_Sock_Info unix_sock;
226 * Path of our unix domain socket (/tmp/unix-plugin-PORT)
228 char *unix_socket_path;
230 struct UNIXMessageWrapper *msg_head;
231 struct UNIXMessageWrapper *msg_tail;
236 struct GNUNET_ATS_Information ats_network;
238 unsigned int bytes_in_queue;
243 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
247 reschedule_select (struct Plugin * plugin)
250 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
252 GNUNET_SCHEDULER_cancel (plugin->select_task);
253 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
256 if (NULL != plugin->msg_head)
258 plugin->select_task =
259 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
260 GNUNET_TIME_UNIT_FOREVER_REL,
263 &unix_plugin_select, plugin);
264 plugin->with_ws = GNUNET_YES;
268 plugin->select_task =
269 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
270 GNUNET_TIME_UNIT_FOREVER_REL,
273 &unix_plugin_select, plugin);
274 plugin->with_ws = GNUNET_NO;
280 get_session_delete_it (void *cls, const GNUNET_HashCode * key, void *value)
282 struct Session *s = value;
283 struct UNIXMessageWrapper *msgw;
284 struct UNIXMessageWrapper *next;
285 struct Plugin *plugin = cls;
287 GNUNET_assert (plugin != NULL);
289 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Deleting session for peer `%s' `%s' \n", GNUNET_i2s (&s->target), s->addr);
290 plugin->env->session_end (plugin->env->cls, &s->target, s);
292 msgw = plugin->msg_head;
294 next = plugin->msg_head;
299 if (msgw->session != s)
301 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
302 if (NULL != msgw->cont)
303 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR);
304 GNUNET_free (msgw->msg);
306 removed = GNUNET_YES;
308 if ((GNUNET_YES == removed) && (NULL == plugin->msg_head))
309 reschedule_select (plugin);
311 GNUNET_assert (GNUNET_YES ==
312 GNUNET_CONTAINER_multihashmap_remove(plugin->session_map, &s->target.hashPubKey, s));
314 GNUNET_STATISTICS_set(plugin->env->stats,
315 "# UNIX sessions active",
316 GNUNET_CONTAINER_multihashmap_size(plugin->session_map),
325 * Disconnect from a remote node. Clean up session if we have one for this peer
327 * @param cls closure for this call (should be handle to Plugin)
328 * @param target the peeridentity of the peer to disconnect
329 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
332 unix_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
334 struct Plugin *plugin = cls;
335 GNUNET_assert (plugin != NULL);
337 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->session_map, &target->hashPubKey, &get_session_delete_it, plugin);
342 * Shutdown the server process (stop receiving inbound traffic). Maybe
345 * @param cls Handle to the plugin for this transport
347 * @return returns the number of sockets successfully closed,
348 * should equal the number of sockets successfully opened
351 unix_transport_server_stop (void *cls)
353 struct Plugin *plugin = cls;
355 struct UNIXMessageWrapper * msgw = plugin->msg_head;
357 while (NULL != (msgw = plugin->msg_head))
359 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
360 if (msgw->cont != NULL)
361 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR);
362 GNUNET_free (msgw->msg);
366 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
368 GNUNET_SCHEDULER_cancel (plugin->select_task);
369 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
372 if (NULL != plugin->unix_sock.desc)
374 GNUNET_break (GNUNET_OK ==
375 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc));
376 plugin->unix_sock.desc = NULL;
377 plugin->with_ws = GNUNET_NO;
384 * Actually send out the message, assume we've got the address and
385 * send_handle squared away!
388 * @param send_handle which handle to send message on
389 * @param target who should receive this message (ignored by UNIX)
390 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
391 * @param msgbuf_size the size of the msgbuf to send
392 * @param priority how important is the message (ignored by UNIX)
393 * @param timeout when should we time out (give up) if we can not transmit?
394 * @param addr the addr to send the message to, needs to be a sockaddr for us
395 * @param addrlen the len of addr
396 * @param cont continuation to call once the message has
397 * been transmitted (or if the transport is ready
398 * for the next transmission call; or if the
399 * peer disconnected...)
400 * @param cont_cls closure for cont
402 * @return the number of bytes written, -1 on errors
405 unix_real_send (void *cls,
406 struct GNUNET_NETWORK_Handle *send_handle,
407 const struct GNUNET_PeerIdentity *target, const char *msgbuf,
408 size_t msgbuf_size, unsigned int priority,
409 struct GNUNET_TIME_Relative timeout, const void *addr,
410 size_t addrlen, GNUNET_TRANSPORT_TransmitContinuation cont,
413 struct Plugin *plugin = cls;
417 struct sockaddr_un un;
421 GNUNET_assert (NULL != plugin);
423 if (send_handle == NULL)
425 /* We do not have a send handle */
428 cont (cont_cls, target, GNUNET_SYSERR);
431 if ((addr == NULL) || (addrlen == 0))
433 /* Can never send if we don't have an address */
436 cont (cont_cls, target, GNUNET_SYSERR);
440 /* Prepare address */
441 memset (&un, 0, sizeof (un));
442 un.sun_family = AF_UNIX;
443 slen = strlen (addr) + 1;
444 if (slen >= sizeof (un.sun_path))
445 slen = sizeof (un.sun_path) - 1;
446 GNUNET_assert (slen < sizeof (un.sun_path));
447 memcpy (un.sun_path, addr, slen);
448 un.sun_path[slen] = '\0';
449 slen = sizeof (struct sockaddr_un);
451 un.sun_path[0] = '\0';
453 #if HAVE_SOCKADDR_IN_SIN_LEN
454 un.sun_len = (u_char) slen;
456 sb = (struct sockaddr *) &un;
462 sent = GNUNET_NETWORK_socket_sendto (send_handle, msgbuf, msgbuf_size, sb, sbs);
464 if ((GNUNET_SYSERR == sent) && ((errno == EAGAIN) || (errno == ENOBUFS)))
466 /* We have to retry later: retry */
470 if ((GNUNET_SYSERR == sent) && (errno == EMSGSIZE))
473 socklen_t len = sizeof (size);
475 GNUNET_NETWORK_socket_getsockopt ((struct GNUNET_NETWORK_Handle *)
476 send_handle, SOL_SOCKET, SO_SNDBUF, &size,
479 if (size < msgbuf_size)
481 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
482 "Trying to increase socket buffer size from %i to %i for message size %i\n",
484 ((msgbuf_size / 1000) + 2) * 1000,
486 size = ((msgbuf_size / 1000) + 2) * 1000;
487 if (GNUNET_NETWORK_socket_setsockopt
488 ((struct GNUNET_NETWORK_Handle *) send_handle, SOL_SOCKET, SO_SNDBUF,
489 &size, sizeof (size)) == GNUNET_OK)
491 /* Increased buffer size, retry sending */
496 /* Could not increase buffer size: error, no retry */
497 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "setsockopt");
503 /* Buffer is bigger than message: error, no retry
504 * This should never happen!*/
510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
511 "UNIX transmit %u-byte message to %s (%d: %s)\n",
512 (unsigned int) msgbuf_size, GNUNET_a2s (sb, sbs), (int) sent,
513 (sent < 0) ? STRERROR (errno) : "ok");
515 /* Calling continuation */
518 if ((sent == GNUNET_SYSERR) && (retry == GNUNET_NO))
519 cont (cont_cls, target, GNUNET_SYSERR);
521 cont (cont_cls, target, GNUNET_OK);
524 /* return number of bytes successfully sent */
529 /* That should never happen */
533 /* failed and retry: return 0 */
534 if ((GNUNET_SYSERR == sent) && (retry == GNUNET_YES))
536 /* failed and no retry: return -1 */
537 if ((GNUNET_SYSERR == sent) && (retry == GNUNET_NO))
552 get_session_it (void *cls, const GNUNET_HashCode * key, void *value)
554 struct gsi_ctx *gsi = cls;
555 struct Session *s = value;
557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Comparing session %s %s\n", gsi->address, s->addr);
558 if ((gsi->addrlen == s->addrlen) &&
559 (0 == memcmp (gsi->address, s->addr, s->addrlen)))
568 * Creates a new outbound session the transport service will use to send data to the
571 * @param cls the plugin
572 * @param address the address
573 * @return the session or NULL of max connections exceeded
575 static struct Session *
576 unix_plugin_get_session (void *cls,
577 const struct GNUNET_HELLO_Address *address)
579 struct Session * s = NULL;
580 struct Plugin *plugin = cls;
584 GNUNET_assert (plugin != NULL);
585 GNUNET_assert (address != NULL);
587 /* Check if already existing */
588 gsi.address = (char *) address->address;
589 gsi.addrlen = address->address_length;
591 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->session_map, &address->peer.hashPubKey, &get_session_it, &gsi);
594 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found existing session\n");
598 /* Create a new session */
600 s = GNUNET_malloc (sizeof (struct Session) + address->address_length);
602 s->addrlen = address->address_length;
603 memcpy(s->addr, address->address, s->addrlen);
604 memcpy(&s->target, &address->peer, sizeof (struct GNUNET_PeerIdentity));
606 GNUNET_CONTAINER_multihashmap_put (plugin->session_map,
607 &address->peer.hashPubKey, s,
608 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
610 GNUNET_STATISTICS_set(plugin->env->stats,
611 "# UNIX sessions active",
612 GNUNET_CONTAINER_multihashmap_size(plugin->session_map),
614 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Creating new session\n");
619 * @param cls the plugin handle
620 * @param tc the scheduling context (for rescheduling this function again)
622 * We have been notified that our writeset has something to read. We don't
623 * know which socket needs to be read, so we have to check each one
624 * Then reschedule this function to be called again once more is available.
628 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
631 * Function that can be used by the transport service to transmit
632 * a message using the plugin. Note that in the case of a
633 * peer disconnecting, the continuation MUST be called
634 * prior to the disconnect notification itself. This function
635 * will be called with this peer's HELLO message to initiate
636 * a fresh connection to another peer.
639 * @param session which session must be used
640 * @param msgbuf the message to transmit
641 * @param msgbuf_size number of bytes in 'msgbuf'
642 * @param priority how important is the message (most plugins will
643 * ignore message priority and just FIFO)
644 * @param to how long to wait at most for the transmission (does not
645 * require plugins to discard the message after the timeout,
646 * just advisory for the desired delay; most plugins will ignore
648 * @param cont continuation to call once the message has
649 * been transmitted (or if the transport is ready
650 * for the next transmission call; or if the
651 * peer disconnected...); can be NULL
652 * @param cont_cls closure for cont
653 * @return number of bytes used (on the physical network, with overheads);
654 * -1 on hard errors (i.e. address invalid); 0 is a legal value
655 * and does NOT mean that the message was not transmitted (DV)
658 unix_plugin_send (void *cls,
659 struct Session *session,
660 const char *msgbuf, size_t msgbuf_size,
661 unsigned int priority,
662 struct GNUNET_TIME_Relative to,
663 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
665 struct Plugin *plugin = cls;
666 struct UNIXMessageWrapper *wrapper;
667 struct UNIXMessage *message;
670 GNUNET_assert (plugin != NULL);
671 GNUNET_assert (session != NULL);
673 if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_contains_value(plugin->session_map,
674 &session->target.hashPubKey, session))
677 return GNUNET_SYSERR;
680 ssize = sizeof (struct UNIXMessage) + msgbuf_size;
681 message = GNUNET_malloc (sizeof (struct UNIXMessage) + msgbuf_size);
682 message->header.size = htons (ssize);
683 message->header.type = htons (0);
684 memcpy (&message->sender, plugin->env->my_identity,
685 sizeof (struct GNUNET_PeerIdentity));
686 memcpy (&message[1], msgbuf, msgbuf_size);
689 wrapper = GNUNET_malloc (sizeof (struct UNIXMessageWrapper));
690 wrapper->msg = message;
691 wrapper->msgsize = ssize;
692 wrapper->priority = priority;
693 wrapper->timeout = to;
694 wrapper->cont = cont;
695 wrapper->cont_cls = cont_cls;
696 wrapper->session = session;
698 GNUNET_CONTAINER_DLL_insert(plugin->msg_head, plugin->msg_tail, wrapper);
700 plugin->bytes_in_queue += ssize;
701 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX bytes in send queue",
702 plugin->bytes_in_queue, GNUNET_NO);
704 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent %d bytes to `%s'\n", ssize,
705 (char *) session->addr);
706 if (plugin->with_ws == GNUNET_NO)
708 reschedule_select (plugin);
715 * Demultiplexer for UNIX messages
717 * @param plugin the main plugin for this transport
718 * @param sender from which peer the message was received
719 * @param currhdr pointer to the header of the message
720 * @param un the address from which the message was received
721 * @param fromlen the length of the address
724 unix_demultiplexer (struct Plugin *plugin, struct GNUNET_PeerIdentity *sender,
725 const struct GNUNET_MessageHeader *currhdr,
726 const struct sockaddr_un *un, size_t fromlen)
728 struct GNUNET_ATS_Information ats[2];
730 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
731 ats[0].value = htonl (UNIX_DIRECT_DISTANCE);
732 ats[1] = plugin->ats_network;
733 GNUNET_break (ntohl(plugin->ats_network.value) != GNUNET_ATS_NET_UNSPECIFIED);
735 GNUNET_assert (fromlen >= sizeof (struct sockaddr_un));
737 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 unix_plugin_select_read (struct Plugin * plugin)
748 char buf[65536] GNUNET_ALIGN;
749 struct UNIXMessage *msg;
750 struct GNUNET_PeerIdentity sender;
751 struct sockaddr_un un;
757 const struct GNUNET_MessageHeader *currhdr;
760 addrlen = sizeof (un);
761 memset (&un, 0, sizeof (un));
764 GNUNET_NETWORK_socket_recvfrom (plugin->unix_sock.desc, buf, sizeof (buf),
765 (struct sockaddr *) &un, &addrlen);
767 if ((GNUNET_SYSERR == ret) && ((errno == EAGAIN) || (errno == ENOBUFS)))
770 if (ret == GNUNET_SYSERR)
772 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "recvfrom");
778 un.sun_path[0] = '/';
780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Read %d bytes from socket %s\n", ret,
784 GNUNET_assert (AF_UNIX == (un.sun_family));
786 msg = (struct UNIXMessage *) buf;
787 csize = ntohs (msg->header.size);
788 if ((csize < sizeof (struct UNIXMessage)) || (csize > ret))
793 msgbuf = (char *) &msg[1];
794 memcpy (&sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
796 tsize = csize - sizeof (struct UNIXMessage);
797 while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
799 currhdr = (struct GNUNET_MessageHeader *) &msgbuf[offset];
800 csize = ntohs (currhdr->size);
801 if ((csize < sizeof (struct GNUNET_MessageHeader)) ||
802 (csize > tsize - offset))
807 unix_demultiplexer (plugin, &sender, currhdr, &un, sizeof (un));
814 unix_plugin_select_write (struct Plugin * plugin)
816 static int retry_counter;
818 struct UNIXMessageWrapper * msgw = plugin->msg_head;
820 sent = unix_real_send (plugin,
821 plugin->unix_sock.desc,
822 &msgw->session->target,
823 (const char *) msgw->msg,
828 msgw->session->addrlen,
829 msgw->cont, msgw->cont_cls);
833 /* failed and retry */
835 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX retry attempt",
836 retry_counter, GNUNET_NO);
840 if (retry_counter > 0 )
842 /* no retry: reset counter */
844 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX retry attempt",
845 retry_counter, GNUNET_NO);
850 /* failed and no retry */
851 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, msgw);
853 GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
854 plugin->bytes_in_queue -= msgw->msgsize;
855 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX bytes in send queue",
856 plugin->bytes_in_queue, GNUNET_NO);
858 GNUNET_free (msgw->msg);
865 /* successfully sent bytes */
866 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, msgw);
868 GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
869 plugin->bytes_in_queue -= msgw->msgsize;
870 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX bytes in send queue",
871 plugin->bytes_in_queue, GNUNET_NO);
873 GNUNET_free (msgw->msg);
882 * We have been notified that our writeset has something to read. We don't
883 * know which socket needs to be read, so we have to check each one
884 * Then reschedule this function to be called again once more is available.
886 * @param cls the plugin handle
887 * @param tc the scheduling context (for rescheduling this function again)
890 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
892 struct Plugin *plugin = cls;
894 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
895 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
898 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
900 /* Ready to send data */
901 GNUNET_assert (GNUNET_NETWORK_fdset_isset
902 (tc->write_ready, plugin->unix_sock.desc));
903 if (plugin->msg_head != NULL)
904 unix_plugin_select_write (plugin);
907 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
909 /* Ready to receive data */
910 GNUNET_assert (GNUNET_NETWORK_fdset_isset
911 (tc->read_ready, plugin->unix_sock.desc));
912 unix_plugin_select_read (plugin);
915 reschedule_select (plugin);
920 * Create a slew of UNIX sockets. If possible, use IPv6 and IPv4.
922 * @param cls closure for server start, should be a struct Plugin *
923 * @return number of sockets created or GNUNET_SYSERR on error
926 unix_transport_server_start (void *cls)
928 struct Plugin *plugin = cls;
929 struct sockaddr *serverAddr;
931 struct sockaddr_un un;
934 memset (&un, 0, sizeof (un));
935 un.sun_family = AF_UNIX;
936 slen = strlen (plugin->unix_socket_path) + 1;
937 if (slen >= sizeof (un.sun_path))
938 slen = sizeof (un.sun_path) - 1;
940 memcpy (un.sun_path, plugin->unix_socket_path, slen);
941 un.sun_path[slen] = '\0';
942 slen = sizeof (struct sockaddr_un);
943 #if HAVE_SOCKADDR_IN_SIN_LEN
944 un.sun_len = (u_char) slen;
947 serverAddr = (struct sockaddr *) &un;
950 un.sun_path[0] = '\0';
952 plugin->ats_network = plugin->env->get_address_type (plugin->env->cls, serverAddr, addrlen);
953 plugin->unix_sock.desc =
954 GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_DGRAM, 0);
955 if (NULL == plugin->unix_sock.desc)
957 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
958 return GNUNET_SYSERR;
960 if (GNUNET_NETWORK_socket_bind (plugin->unix_sock.desc, serverAddr, addrlen)
963 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
964 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc);
965 plugin->unix_sock.desc = NULL;
966 return GNUNET_SYSERR;
968 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "unix", "Bound to `%s'\n",
970 plugin->rs = GNUNET_NETWORK_fdset_create ();
971 plugin->ws = GNUNET_NETWORK_fdset_create ();
972 GNUNET_NETWORK_fdset_zero (plugin->rs);
973 GNUNET_NETWORK_fdset_zero (plugin->ws);
974 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->unix_sock.desc);
975 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->unix_sock.desc);
977 reschedule_select (plugin);
984 * Function that will be called to check if a binary address for this
985 * plugin is well-formed and corresponds to an address for THIS peer
986 * (as per our configuration). Naturally, if absolutely necessary,
987 * plugins can be a bit conservative in their answer, but in general
988 * plugins should make sure that the address does not redirect
989 * traffic to a 3rd party that might try to man-in-the-middle our
992 * @param cls closure, should be our handle to the Plugin
993 * @param addr pointer to the address
994 * @param addrlen length of addr
995 * @return GNUNET_OK if this is a plausible address for this peer
996 * and transport, GNUNET_SYSERR if not
1000 unix_check_address (void *cls, const void *addr, size_t addrlen)
1002 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1003 "Informing transport service about my address `%s'\n",
1010 * Convert the transports address to a nice, human-readable
1013 * @param cls closure
1014 * @param type name of the transport that generated the address
1015 * @param addr one of the addresses of the host, NULL for the last address
1016 * the specific address format depends on the transport
1017 * @param addrlen length of the address
1018 * @param numeric should (IP) addresses be displayed in numeric form?
1019 * @param timeout after how long should we give up?
1020 * @param asc function to call on each string
1021 * @param asc_cls closure for asc
1024 unix_plugin_address_pretty_printer (void *cls, const char *type,
1025 const void *addr, size_t addrlen,
1027 struct GNUNET_TIME_Relative timeout,
1028 GNUNET_TRANSPORT_AddressStringCallback asc,
1031 if ((NULL != addr) && (addrlen > 0))
1033 asc (asc_cls, (const char *) addr);
1038 asc (asc_cls, "<invalid UNIX address>");
1040 asc (asc_cls, NULL);
1045 * Function called to convert a string address to
1048 * @param cls closure ('struct Plugin*')
1049 * @param addr string address
1050 * @param addrlen length of the address (strlen(addr) + '\0')
1051 * @param buf location to store the buffer
1052 * If the function returns GNUNET_SYSERR, its contents are undefined.
1053 * @param added length of created address
1054 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
1057 unix_string_to_address (void *cls, const char *addr, uint16_t addrlen,
1058 void **buf, size_t *added)
1060 if ((NULL == addr) || (0 == addrlen))
1063 return GNUNET_SYSERR;
1066 if ('\0' != addr[addrlen - 1])
1069 return GNUNET_SYSERR;
1072 if (strlen (addr) != addrlen - 1)
1075 return GNUNET_SYSERR;
1078 (*buf) = strdup (addr);
1079 (*added) = strlen (addr) + 1;
1085 * Function called for a quick conversion of the binary address to
1086 * a numeric address. Note that the caller must not free the
1087 * address and that the next call to this function is allowed
1088 * to override the address again.
1090 * @param cls closure
1091 * @param addr binary address
1092 * @param addrlen length of the address
1093 * @return string representing the same address
1096 unix_address_to_string (void *cls, const void *addr, size_t addrlen)
1098 if ((addr != NULL) && (addrlen > 0))
1099 return (const char *) addr;
1105 * Notify transport service about address
1107 * @param cls the plugin
1111 address_notification (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1113 struct Plugin *plugin = cls;
1115 plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
1116 plugin->unix_socket_path,
1117 strlen (plugin->unix_socket_path) + 1);
1121 * The exported method. Makes the core api available via a global and
1122 * returns the unix transport API.
1125 libgnunet_plugin_transport_unix_init (void *cls)
1127 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1128 unsigned long long port;
1129 struct GNUNET_TRANSPORT_PluginFunctions *api;
1130 struct Plugin *plugin;
1131 int sockets_created;
1133 if (NULL == env->receive)
1135 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
1136 initialze the plugin or the API */
1137 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1139 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1140 api->address_to_string = &unix_address_to_string;
1141 api->string_to_address = &unix_string_to_address;
1144 GNUNET_assert( NULL != env->stats);
1147 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-unix", "PORT",
1149 port = UNIX_NAT_DEFAULT_PORT;
1150 plugin = GNUNET_malloc (sizeof (struct Plugin));
1151 plugin->port = port;
1153 GNUNET_asprintf (&plugin->unix_socket_path, "/tmp/unix-plugin-sock.%d",
1156 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1159 api->get_session = &unix_plugin_get_session;
1160 api->send = &unix_plugin_send;
1161 api->disconnect = &unix_disconnect;
1162 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1163 api->address_to_string = &unix_address_to_string;
1164 api->check_address = &unix_check_address;
1165 api->string_to_address = &unix_string_to_address;
1166 sockets_created = unix_transport_server_start (plugin);
1167 if (sockets_created == 0)
1168 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UNIX sockets\n"));
1170 plugin->session_map = GNUNET_CONTAINER_multihashmap_create(10);
1172 GNUNET_SCHEDULER_add_now (address_notification, plugin);
1177 libgnunet_plugin_transport_unix_done (void *cls)
1179 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1180 struct Plugin *plugin = api->cls;
1187 unix_transport_server_stop (plugin);
1189 GNUNET_CONTAINER_multihashmap_iterate (plugin->session_map, &get_session_delete_it, plugin);
1190 GNUNET_CONTAINER_multihashmap_destroy (plugin->session_map);
1192 if (NULL != plugin->rs)
1193 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1194 if (NULL != plugin->ws)
1195 GNUNET_NETWORK_fdset_destroy (plugin->ws);
1196 GNUNET_free (plugin->unix_socket_path);
1197 GNUNET_free (plugin);
1202 /* end of plugin_transport_unix.c */