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 Plugin *plugin = cls;
286 GNUNET_assert (plugin != NULL);
288 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Deleting session for peer `%s' `%s' \n", GNUNET_i2s (&s->target), s->addr);
289 plugin->env->session_end (plugin->env->cls, &s->target, s);
291 msgw = plugin->msg_head;
293 for (msgw = plugin->msg_head; NULL != msgw; msgw = msgw->next)
295 if (msgw->session != s)
297 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
298 if (NULL != msgw->cont)
299 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR);
300 GNUNET_free (msgw->msg);
302 removed = GNUNET_YES;
304 if ((GNUNET_YES == removed) && (NULL == plugin->msg_head))
305 reschedule_select (plugin);
307 GNUNET_assert (GNUNET_YES ==
308 GNUNET_CONTAINER_multihashmap_remove(plugin->session_map, &s->target.hashPubKey, s));
310 GNUNET_STATISTICS_set(plugin->env->stats,
311 "# UNIX sessions active",
312 GNUNET_CONTAINER_multihashmap_size(plugin->session_map),
321 * Disconnect from a remote node. Clean up session if we have one for this peer
323 * @param cls closure for this call (should be handle to Plugin)
324 * @param target the peeridentity of the peer to disconnect
325 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
328 unix_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
330 struct Plugin *plugin = cls;
331 GNUNET_assert (plugin != NULL);
333 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->session_map, &target->hashPubKey, &get_session_delete_it, plugin);
338 * Shutdown the server process (stop receiving inbound traffic). Maybe
341 * @param cls Handle to the plugin for this transport
343 * @return returns the number of sockets successfully closed,
344 * should equal the number of sockets successfully opened
347 unix_transport_server_stop (void *cls)
349 struct Plugin *plugin = cls;
351 struct UNIXMessageWrapper * msgw = plugin->msg_head;
353 while (NULL != (msgw = plugin->msg_head))
355 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
356 if (msgw->cont != NULL)
357 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR);
358 GNUNET_free (msgw->msg);
362 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
364 GNUNET_SCHEDULER_cancel (plugin->select_task);
365 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
368 if (NULL != plugin->unix_sock.desc)
370 GNUNET_break (GNUNET_OK ==
371 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc));
372 plugin->unix_sock.desc = NULL;
373 plugin->with_ws = GNUNET_NO;
380 * Actually send out the message, assume we've got the address and
381 * send_handle squared away!
384 * @param send_handle which handle to send message on
385 * @param target who should receive this message (ignored by UNIX)
386 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
387 * @param msgbuf_size the size of the msgbuf to send
388 * @param priority how important is the message (ignored by UNIX)
389 * @param timeout when should we time out (give up) if we can not transmit?
390 * @param addr the addr to send the message to, needs to be a sockaddr for us
391 * @param addrlen the len of addr
392 * @param cont continuation to call once the message has
393 * been transmitted (or if the transport is ready
394 * for the next transmission call; or if the
395 * peer disconnected...)
396 * @param cont_cls closure for cont
398 * @return the number of bytes written, -1 on errors
401 unix_real_send (void *cls,
402 struct GNUNET_NETWORK_Handle *send_handle,
403 const struct GNUNET_PeerIdentity *target, const char *msgbuf,
404 size_t msgbuf_size, unsigned int priority,
405 struct GNUNET_TIME_Relative timeout, const void *addr,
406 size_t addrlen, GNUNET_TRANSPORT_TransmitContinuation cont,
409 struct Plugin *plugin = cls;
413 struct sockaddr_un un;
417 GNUNET_assert (NULL != plugin);
419 if (send_handle == NULL)
421 /* We do not have a send handle */
424 cont (cont_cls, target, GNUNET_SYSERR);
427 if ((addr == NULL) || (addrlen == 0))
429 /* Can never send if we don't have an address */
432 cont (cont_cls, target, GNUNET_SYSERR);
436 /* Prepare address */
437 memset (&un, 0, sizeof (un));
438 un.sun_family = AF_UNIX;
439 slen = strlen (addr) + 1;
440 if (slen >= sizeof (un.sun_path))
441 slen = sizeof (un.sun_path) - 1;
442 GNUNET_assert (slen < sizeof (un.sun_path));
443 memcpy (un.sun_path, addr, slen);
444 un.sun_path[slen] = '\0';
445 slen = sizeof (struct sockaddr_un);
447 un.sun_path[0] = '\0';
449 #if HAVE_SOCKADDR_IN_SIN_LEN
450 un.sun_len = (u_char) slen;
452 sb = (struct sockaddr *) &un;
458 sent = GNUNET_NETWORK_socket_sendto (send_handle, msgbuf, msgbuf_size, sb, sbs);
460 if ((GNUNET_SYSERR == sent) && ((errno == EAGAIN) || (errno == ENOBUFS)))
462 /* We have to retry later: retry */
466 if ((GNUNET_SYSERR == sent) && (errno == EMSGSIZE))
469 socklen_t len = sizeof (size);
471 GNUNET_NETWORK_socket_getsockopt ((struct GNUNET_NETWORK_Handle *)
472 send_handle, SOL_SOCKET, SO_SNDBUF, &size,
475 if (size < msgbuf_size)
477 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
478 "Trying to increase socket buffer size from %i to %i for message size %i\n",
480 ((msgbuf_size / 1000) + 2) * 1000,
482 size = ((msgbuf_size / 1000) + 2) * 1000;
483 if (GNUNET_NETWORK_socket_setsockopt
484 ((struct GNUNET_NETWORK_Handle *) send_handle, SOL_SOCKET, SO_SNDBUF,
485 &size, sizeof (size)) == GNUNET_OK)
487 /* Increased buffer size, retry sending */
492 /* Could not increase buffer size: error, no retry */
493 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "setsockopt");
499 /* Buffer is bigger than message: error, no retry
500 * This should never happen!*/
506 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
507 "UNIX transmit %u-byte message to %s (%d: %s)\n",
508 (unsigned int) msgbuf_size, GNUNET_a2s (sb, sbs), (int) sent,
509 (sent < 0) ? STRERROR (errno) : "ok");
511 /* Calling continuation */
514 if ((sent == GNUNET_SYSERR) && (retry == GNUNET_NO))
515 cont (cont_cls, target, GNUNET_SYSERR);
517 cont (cont_cls, target, GNUNET_OK);
520 /* return number of bytes successfully sent */
525 /* That should never happen */
529 /* failed and retry: return 0 */
530 if ((GNUNET_SYSERR == sent) && (retry == GNUNET_YES))
532 /* failed and no retry: return -1 */
533 if ((GNUNET_SYSERR == sent) && (retry == GNUNET_NO))
548 get_session_it (void *cls, const GNUNET_HashCode * key, void *value)
550 struct gsi_ctx *gsi = cls;
551 struct Session *s = value;
553 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Comparing session %s %s\n", gsi->address, s->addr);
554 if ((gsi->addrlen == s->addrlen) &&
555 (0 == memcmp (gsi->address, s->addr, s->addrlen)))
564 * Creates a new outbound session the transport service will use to send data to the
567 * @param cls the plugin
568 * @param address the address
569 * @return the session or NULL of max connections exceeded
571 static struct Session *
572 unix_plugin_get_session (void *cls,
573 const struct GNUNET_HELLO_Address *address)
575 struct Session * s = NULL;
576 struct Plugin *plugin = cls;
580 GNUNET_assert (plugin != NULL);
581 GNUNET_assert (address != NULL);
583 /* Check if already existing */
584 gsi.address = (char *) address->address;
585 gsi.addrlen = address->address_length;
587 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->session_map, &address->peer.hashPubKey, &get_session_it, &gsi);
590 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found existing session\n");
594 /* Create a new session */
596 s = GNUNET_malloc (sizeof (struct Session) + address->address_length);
598 s->addrlen = address->address_length;
599 memcpy(s->addr, address->address, s->addrlen);
600 memcpy(&s->target, &address->peer, sizeof (struct GNUNET_PeerIdentity));
602 GNUNET_CONTAINER_multihashmap_put (plugin->session_map,
603 &address->peer.hashPubKey, s,
604 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
606 GNUNET_STATISTICS_set(plugin->env->stats,
607 "# UNIX sessions active",
608 GNUNET_CONTAINER_multihashmap_size(plugin->session_map),
610 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Creating new session\n");
615 * @param cls the plugin handle
616 * @param tc the scheduling context (for rescheduling this function again)
618 * We have been notified that our writeset has something to read. We don't
619 * know which socket needs to be read, so we have to check each one
620 * Then reschedule this function to be called again once more is available.
624 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
627 * Function that can be used by the transport service to transmit
628 * a message using the plugin. Note that in the case of a
629 * peer disconnecting, the continuation MUST be called
630 * prior to the disconnect notification itself. This function
631 * will be called with this peer's HELLO message to initiate
632 * a fresh connection to another peer.
635 * @param session which session must be used
636 * @param msgbuf the message to transmit
637 * @param msgbuf_size number of bytes in 'msgbuf'
638 * @param priority how important is the message (most plugins will
639 * ignore message priority and just FIFO)
640 * @param to how long to wait at most for the transmission (does not
641 * require plugins to discard the message after the timeout,
642 * just advisory for the desired delay; most plugins will ignore
644 * @param cont continuation to call once the message has
645 * been transmitted (or if the transport is ready
646 * for the next transmission call; or if the
647 * peer disconnected...); can be NULL
648 * @param cont_cls closure for cont
649 * @return number of bytes used (on the physical network, with overheads);
650 * -1 on hard errors (i.e. address invalid); 0 is a legal value
651 * and does NOT mean that the message was not transmitted (DV)
654 unix_plugin_send (void *cls,
655 struct Session *session,
656 const char *msgbuf, size_t msgbuf_size,
657 unsigned int priority,
658 struct GNUNET_TIME_Relative to,
659 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
661 struct Plugin *plugin = cls;
662 struct UNIXMessageWrapper *wrapper;
663 struct UNIXMessage *message;
666 GNUNET_assert (plugin != NULL);
667 GNUNET_assert (session != NULL);
669 if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_contains_value(plugin->session_map,
670 &session->target.hashPubKey, session))
673 return GNUNET_SYSERR;
676 ssize = sizeof (struct UNIXMessage) + msgbuf_size;
677 message = GNUNET_malloc (sizeof (struct UNIXMessage) + msgbuf_size);
678 message->header.size = htons (ssize);
679 message->header.type = htons (0);
680 memcpy (&message->sender, plugin->env->my_identity,
681 sizeof (struct GNUNET_PeerIdentity));
682 memcpy (&message[1], msgbuf, msgbuf_size);
685 wrapper = GNUNET_malloc (sizeof (struct UNIXMessageWrapper));
686 wrapper->msg = message;
687 wrapper->msgsize = ssize;
688 wrapper->priority = priority;
689 wrapper->timeout = to;
690 wrapper->cont = cont;
691 wrapper->cont_cls = cont_cls;
692 wrapper->session = session;
694 GNUNET_CONTAINER_DLL_insert(plugin->msg_head, plugin->msg_tail, wrapper);
696 plugin->bytes_in_queue += ssize;
697 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX bytes in send queue",
698 plugin->bytes_in_queue, GNUNET_NO);
700 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent %d bytes to `%s'\n", ssize,
701 (char *) session->addr);
702 if (plugin->with_ws == GNUNET_NO)
704 reschedule_select (plugin);
711 * Demultiplexer for UNIX messages
713 * @param plugin the main plugin for this transport
714 * @param sender from which peer the message was received
715 * @param currhdr pointer to the header of the message
716 * @param un the address from which the message was received
717 * @param fromlen the length of the address
720 unix_demultiplexer (struct Plugin *plugin, struct GNUNET_PeerIdentity *sender,
721 const struct GNUNET_MessageHeader *currhdr,
722 const struct sockaddr_un *un, size_t fromlen)
724 struct GNUNET_ATS_Information ats[2];
726 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
727 ats[0].value = htonl (UNIX_DIRECT_DISTANCE);
728 ats[1] = plugin->ats_network;
729 GNUNET_break (ntohl(plugin->ats_network.value) != GNUNET_ATS_NET_UNSPECIFIED);
731 GNUNET_assert (fromlen >= sizeof (struct sockaddr_un));
733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received message from %s\n",
735 plugin->env->receive (plugin->env->cls, sender, currhdr,
736 (const struct GNUNET_ATS_Information *) &ats, 2,
737 NULL, un->sun_path, strlen (un->sun_path) + 1);
742 unix_plugin_select_read (struct Plugin * plugin)
744 char buf[65536] GNUNET_ALIGN;
745 struct UNIXMessage *msg;
746 struct GNUNET_PeerIdentity sender;
747 struct sockaddr_un un;
753 const struct GNUNET_MessageHeader *currhdr;
756 addrlen = sizeof (un);
757 memset (&un, 0, sizeof (un));
760 GNUNET_NETWORK_socket_recvfrom (plugin->unix_sock.desc, buf, sizeof (buf),
761 (struct sockaddr *) &un, &addrlen);
763 if ((GNUNET_SYSERR == ret) && ((errno == EAGAIN) || (errno == ENOBUFS)))
766 if (ret == GNUNET_SYSERR)
768 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "recvfrom");
774 un.sun_path[0] = '/';
776 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Read %d bytes from socket %s\n", ret,
780 GNUNET_assert (AF_UNIX == (un.sun_family));
782 msg = (struct UNIXMessage *) buf;
783 csize = ntohs (msg->header.size);
784 if ((csize < sizeof (struct UNIXMessage)) || (csize > ret))
789 msgbuf = (char *) &msg[1];
790 memcpy (&sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
792 tsize = csize - sizeof (struct UNIXMessage);
793 while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
795 currhdr = (struct GNUNET_MessageHeader *) &msgbuf[offset];
796 csize = ntohs (currhdr->size);
797 if ((csize < sizeof (struct GNUNET_MessageHeader)) ||
798 (csize > tsize - offset))
803 unix_demultiplexer (plugin, &sender, currhdr, &un, sizeof (un));
810 unix_plugin_select_write (struct Plugin * plugin)
812 static int retry_counter;
814 struct UNIXMessageWrapper * msgw = plugin->msg_head;
816 sent = unix_real_send (plugin,
817 plugin->unix_sock.desc,
818 &msgw->session->target,
819 (const char *) msgw->msg,
824 msgw->session->addrlen,
825 msgw->cont, msgw->cont_cls);
829 /* failed and retry */
831 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX retry attempt",
832 retry_counter, GNUNET_NO);
836 if (retry_counter > 0 )
838 /* no retry: reset counter */
840 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX retry attempt",
841 retry_counter, GNUNET_NO);
846 /* failed and no retry */
847 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, msgw);
849 GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
850 plugin->bytes_in_queue -= msgw->msgsize;
851 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX bytes in send queue",
852 plugin->bytes_in_queue, GNUNET_NO);
854 GNUNET_free (msgw->msg);
861 /* successfully sent bytes */
862 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, msgw);
864 GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
865 plugin->bytes_in_queue -= msgw->msgsize;
866 GNUNET_STATISTICS_set (plugin->env->stats,"# UNIX bytes in send queue",
867 plugin->bytes_in_queue, GNUNET_NO);
869 GNUNET_free (msgw->msg);
878 * We have been notified that our writeset has something to read. We don't
879 * know which socket needs to be read, so we have to check each one
880 * Then reschedule this function to be called again once more is available.
882 * @param cls the plugin handle
883 * @param tc the scheduling context (for rescheduling this function again)
886 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
888 struct Plugin *plugin = cls;
890 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
891 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
894 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
896 /* Ready to send data */
897 GNUNET_assert (GNUNET_NETWORK_fdset_isset
898 (tc->write_ready, plugin->unix_sock.desc));
899 if (plugin->msg_head != NULL)
900 unix_plugin_select_write (plugin);
903 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
905 /* Ready to receive data */
906 GNUNET_assert (GNUNET_NETWORK_fdset_isset
907 (tc->read_ready, plugin->unix_sock.desc));
908 unix_plugin_select_read (plugin);
911 reschedule_select (plugin);
916 * Create a slew of UNIX sockets. If possible, use IPv6 and IPv4.
918 * @param cls closure for server start, should be a struct Plugin *
919 * @return number of sockets created or GNUNET_SYSERR on error
922 unix_transport_server_start (void *cls)
924 struct Plugin *plugin = cls;
925 struct sockaddr *serverAddr;
927 struct sockaddr_un un;
930 memset (&un, 0, sizeof (un));
931 un.sun_family = AF_UNIX;
932 slen = strlen (plugin->unix_socket_path) + 1;
933 if (slen >= sizeof (un.sun_path))
934 slen = sizeof (un.sun_path) - 1;
936 memcpy (un.sun_path, plugin->unix_socket_path, slen);
937 un.sun_path[slen] = '\0';
938 slen = sizeof (struct sockaddr_un);
939 #if HAVE_SOCKADDR_IN_SIN_LEN
940 un.sun_len = (u_char) slen;
943 serverAddr = (struct sockaddr *) &un;
946 un.sun_path[0] = '\0';
948 plugin->ats_network = plugin->env->get_address_type (plugin->env->cls, serverAddr, addrlen);
949 plugin->unix_sock.desc =
950 GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_DGRAM, 0);
951 if (NULL == plugin->unix_sock.desc)
953 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
954 return GNUNET_SYSERR;
956 if (GNUNET_NETWORK_socket_bind (plugin->unix_sock.desc, serverAddr, addrlen)
959 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
960 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc);
961 plugin->unix_sock.desc = NULL;
962 return GNUNET_SYSERR;
964 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "unix", "Bound to `%s'\n",
966 plugin->rs = GNUNET_NETWORK_fdset_create ();
967 plugin->ws = GNUNET_NETWORK_fdset_create ();
968 GNUNET_NETWORK_fdset_zero (plugin->rs);
969 GNUNET_NETWORK_fdset_zero (plugin->ws);
970 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->unix_sock.desc);
971 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->unix_sock.desc);
973 reschedule_select (plugin);
980 * Function that will be called to check if a binary address for this
981 * plugin is well-formed and corresponds to an address for THIS peer
982 * (as per our configuration). Naturally, if absolutely necessary,
983 * plugins can be a bit conservative in their answer, but in general
984 * plugins should make sure that the address does not redirect
985 * traffic to a 3rd party that might try to man-in-the-middle our
988 * @param cls closure, should be our handle to the Plugin
989 * @param addr pointer to the address
990 * @param addrlen length of addr
991 * @return GNUNET_OK if this is a plausible address for this peer
992 * and transport, GNUNET_SYSERR if not
996 unix_check_address (void *cls, const void *addr, size_t addrlen)
998 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
999 "Informing transport service about my address `%s'\n",
1006 * Convert the transports address to a nice, human-readable
1009 * @param cls closure
1010 * @param type name of the transport that generated the address
1011 * @param addr one of the addresses of the host, NULL for the last address
1012 * the specific address format depends on the transport
1013 * @param addrlen length of the address
1014 * @param numeric should (IP) addresses be displayed in numeric form?
1015 * @param timeout after how long should we give up?
1016 * @param asc function to call on each string
1017 * @param asc_cls closure for asc
1020 unix_plugin_address_pretty_printer (void *cls, const char *type,
1021 const void *addr, size_t addrlen,
1023 struct GNUNET_TIME_Relative timeout,
1024 GNUNET_TRANSPORT_AddressStringCallback asc,
1027 if ((NULL != addr) && (addrlen > 0))
1029 asc (asc_cls, (const char *) addr);
1034 asc (asc_cls, "<invalid UNIX address>");
1036 asc (asc_cls, NULL);
1041 * Function called to convert a string address to
1044 * @param cls closure ('struct Plugin*')
1045 * @param addr string address
1046 * @param addrlen length of the address (strlen(addr) + '\0')
1047 * @param buf location to store the buffer
1048 * If the function returns GNUNET_SYSERR, its contents are undefined.
1049 * @param added length of created address
1050 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
1053 unix_string_to_address (void *cls, const char *addr, uint16_t addrlen,
1054 void **buf, size_t *added)
1056 if ((NULL == addr) || (0 == addrlen))
1059 return GNUNET_SYSERR;
1062 if ('\0' != addr[addrlen - 1])
1065 return GNUNET_SYSERR;
1068 if (strlen (addr) != addrlen - 1)
1071 return GNUNET_SYSERR;
1074 (*buf) = strdup (addr);
1075 (*added) = strlen (addr) + 1;
1081 * Function called for a quick conversion of the binary address to
1082 * a numeric address. Note that the caller must not free the
1083 * address and that the next call to this function is allowed
1084 * to override the address again.
1086 * @param cls closure
1087 * @param addr binary address
1088 * @param addrlen length of the address
1089 * @return string representing the same address
1092 unix_address_to_string (void *cls, const void *addr, size_t addrlen)
1094 if ((addr != NULL) && (addrlen > 0))
1095 return (const char *) addr;
1101 * Notify transport service about address
1103 * @param cls the plugin
1107 address_notification (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1109 struct Plugin *plugin = cls;
1111 plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
1112 plugin->unix_socket_path,
1113 strlen (plugin->unix_socket_path) + 1);
1117 * The exported method. Makes the core api available via a global and
1118 * returns the unix transport API.
1121 libgnunet_plugin_transport_unix_init (void *cls)
1123 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1124 unsigned long long port;
1125 struct GNUNET_TRANSPORT_PluginFunctions *api;
1126 struct Plugin *plugin;
1127 int sockets_created;
1129 if (NULL == env->receive)
1131 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
1132 initialze the plugin or the API */
1133 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1135 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1136 api->address_to_string = &unix_address_to_string;
1137 api->string_to_address = &unix_string_to_address;
1140 GNUNET_assert( NULL != env->stats);
1143 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-unix", "PORT",
1145 port = UNIX_NAT_DEFAULT_PORT;
1146 plugin = GNUNET_malloc (sizeof (struct Plugin));
1147 plugin->port = port;
1149 GNUNET_asprintf (&plugin->unix_socket_path, "/tmp/unix-plugin-sock.%d",
1152 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1155 api->get_session = &unix_plugin_get_session;
1156 api->send = &unix_plugin_send;
1157 api->disconnect = &unix_disconnect;
1158 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1159 api->address_to_string = &unix_address_to_string;
1160 api->check_address = &unix_check_address;
1161 api->string_to_address = &unix_string_to_address;
1162 sockets_created = unix_transport_server_start (plugin);
1163 if (sockets_created == 0)
1164 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UNIX sockets\n"));
1166 plugin->session_map = GNUNET_CONTAINER_multihashmap_create(10);
1168 GNUNET_SCHEDULER_add_now (address_notification, plugin);
1173 libgnunet_plugin_transport_unix_done (void *cls)
1175 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1176 struct Plugin *plugin = api->cls;
1183 unix_transport_server_stop (plugin);
1185 GNUNET_CONTAINER_multihashmap_iterate (plugin->session_map, &get_session_delete_it, plugin);
1186 GNUNET_CONTAINER_multihashmap_destroy (plugin->session_map);
1188 if (NULL != plugin->rs)
1189 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1190 if (NULL != plugin->ws)
1191 GNUNET_NETWORK_fdset_destroy (plugin->ws);
1192 GNUNET_free (plugin->unix_socket_path);
1193 GNUNET_free (plugin);
1198 /* end of plugin_transport_unix.c */