2 This file is part of GNUnet
3 (C) 2010, 2013 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
30 #include "gnunet_hello_lib.h"
31 #include "gnunet_util_lib.h"
32 #include "gnunet_protocols.h"
33 #include "gnunet_statistics_service.h"
34 #include "gnunet_transport_service.h"
35 #include "gnunet_transport_plugin.h"
36 #include "transport.h"
40 * Return code we give on 'send' if we failed to send right now
41 * but it makes sense to retry later. (Note: we might want to
42 * move this to the plugin API!?).
46 #define PLUGIN_NAME "unix"
49 * How long until we give up on transmitting the welcome message?
51 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
54 * Default "port" to use, if configuration does not specify.
55 * Essentially just a number appended to the UNIX path.
57 #define UNIX_NAT_DEFAULT_PORT 22086
60 #define LOG(kind,...) GNUNET_log_from (kind, "transport-unix",__VA_ARGS__)
63 GNUNET_NETWORK_STRUCT_BEGIN
67 uint32_t options GNUNET_PACKED;
69 uint32_t addrlen GNUNET_PACKED;
74 * UNIX Message-Packet header.
81 struct GNUNET_MessageHeader header;
84 * What is the identity of the sender (GNUNET_hash of public key)
86 struct GNUNET_PeerIdentity sender;
90 GNUNET_NETWORK_STRUCT_END
95 static uint32_t myoptions;
98 * Handle for a session.
102 struct GNUNET_PeerIdentity target;
104 struct Plugin * plugin;
106 struct UnixAddress *addr;
113 * Session timeout task
115 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
119 struct UNIXMessageWrapper
122 * We keep messages in a doubly linked list.
124 struct UNIXMessageWrapper *next;
127 * We keep messages in a doubly linked list.
129 struct UNIXMessageWrapper *prev;
132 * The actual payload (allocated separately right now).
134 struct UNIXMessage * msg;
137 * Session this message belongs to.
139 struct Session *session;
142 * Function to call upon transmission.
144 GNUNET_TRANSPORT_TransmitContinuation cont;
147 * Closure for 'cont'.
152 * Timeout for this message.
154 struct GNUNET_TIME_Absolute timeout;
157 * Number of bytes in 'msg'.
162 * Number of bytes of payload encapsulated in 'msg'.
167 * Priority of the message (ignored, just dragged along in UNIX).
169 unsigned int priority;
174 * Encapsulation of all of the state of the plugin.
186 * Stored in a linked list.
188 struct PeerSession *next;
191 * Pointer to the global plugin struct.
193 struct Plugin *plugin;
196 * To whom are we talking to (set to our identity
197 * if we are still waiting for the welcome message)
199 struct GNUNET_PeerIdentity target;
202 * Address of the other peer (either based on our 'connect'
203 * call or on our 'accept' call).
208 * Length of connect_addr.
213 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
215 int expecting_welcome;
218 * From which socket do we need to send to this peer?
220 struct GNUNET_NETWORK_Handle *sock;
223 * Queue of messages for this peer, in the case that
224 * we have to await a connection...
226 struct MessageQueue *messages;
232 * Information we keep for each of our listen sockets.
234 struct UNIX_Sock_Info
239 struct GNUNET_NETWORK_Handle *desc;
242 * The port we bound to (not an actual PORT, as UNIX domain sockets
243 * don't have ports, but rather a number in the path name to make this
251 * Encapsulation of all of the state of the plugin.
257 * ID of task used to update our addresses when one expires.
259 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
264 GNUNET_SCHEDULER_TaskIdentifier select_task;
267 * Number of bytes we currently have in our write queue.
269 unsigned long long bytes_in_queue;
274 struct GNUNET_TRANSPORT_PluginEnvironment *env;
279 struct GNUNET_CONTAINER_MultiHashMap *session_map;
284 struct GNUNET_NETWORK_FDSet *rs;
289 struct GNUNET_NETWORK_FDSet *ws;
292 * Path of our unix domain socket (/tmp/unix-plugin-PORT)
294 char *unix_socket_path;
297 * Head of queue of messages to transmit.
299 struct UNIXMessageWrapper *msg_head;
302 * Tail of queue of messages to transmit.
304 struct UNIXMessageWrapper *msg_tail;
307 * socket that we transmit all data with
309 struct UNIX_Sock_Info unix_sock;
314 struct GNUNET_ATS_Information ats_network;
317 * Is the write set in the current 'select' task? GNUNET_NO if the
318 * write queue was empty when the main task was scheduled,
319 * GNUNET_YES if we're already waiting for being allowed to write.
324 * Integer to append to unix domain socket.
332 * Increment session timeout due to activity
334 * @param s session for which the timeout should be moved
337 reschedule_session_timeout (struct Session *s);
341 * We have been notified that our writeset has something to read. We don't
342 * know which socket needs to be read, so we have to check each one
343 * Then reschedule this function to be called again once more is available.
345 * @param cls the plugin handle
346 * @param tc the scheduling context (for rescheduling this function again)
349 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
352 * Function called for a quick conversion of the binary address to
353 * a numeric address. Note that the caller must not free the
354 * address and that the next call to this function is allowed
355 * to override the address again.
358 * @param addr binary address
359 * @param addrlen length of the address
360 * @return string representing the same address
363 unix_address_to_string (void *cls, const void *addr, size_t addrlen);
366 * Re-schedule the main 'select' callback (unix_plugin_select)
369 * @param plugin the plugin context
372 reschedule_select (struct Plugin * plugin)
374 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
376 GNUNET_SCHEDULER_cancel (plugin->select_task);
377 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
379 if (NULL != plugin->msg_head)
381 plugin->select_task =
382 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
383 GNUNET_TIME_UNIT_FOREVER_REL,
386 &unix_plugin_select, plugin);
387 plugin->with_ws = GNUNET_YES;
391 plugin->select_task =
392 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
393 GNUNET_TIME_UNIT_FOREVER_REL,
396 &unix_plugin_select, plugin);
397 plugin->with_ws = GNUNET_NO;
403 * Closure to 'lookup_session_it'.
408 * Location to store the session, if found.
413 * Address we are looking for.
415 const struct UnixAddress *ua;
422 * Function called to find a session by address.
424 * @param cls the 'struct LookupCtx'
425 * @param key peer we are looking for (unused)
426 * @param value a session
427 * @return GNUNET_YES if not found (continue looking), GNUNET_NO on success
430 lookup_session_it (void *cls,
431 const struct GNUNET_HashCode * key,
434 struct LookupCtx *lctx = cls;
435 struct Session *t = value;
437 if (t->addrlen != lctx->ua_len)
443 if (0 == memcmp (t->addr, lctx->ua, lctx->ua_len))
454 * Find an existing session by address.
456 * @param plugin the plugin
457 * @param sender for which peer should the session be?
458 * @param ua address to look for
459 * @param ua_len length of the address
460 * @return NULL if session was not found
462 static struct Session *
463 lookup_session (struct Plugin *plugin,
464 const struct GNUNET_PeerIdentity *sender,
465 const struct UnixAddress *ua, size_t ua_len)
467 struct LookupCtx lctx;
469 GNUNET_assert (NULL != plugin);
470 GNUNET_assert (NULL != sender);
471 GNUNET_assert (NULL != ua);
474 lctx.ua_len = ua_len;
475 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->session_map,
477 &lookup_session_it, &lctx);
483 * Functions with this signature are called whenever we need
484 * to close a session due to a disconnect or failure to
485 * establish a connection.
487 * @param s session to close down
490 disconnect_session (struct Session *s)
492 struct Plugin *plugin = s->plugin;
493 struct UNIXMessageWrapper *msgw;
494 struct UNIXMessageWrapper *next;
497 LOG (GNUNET_ERROR_TYPE_DEBUG,
498 "Disconnecting session for peer `%s' `%s'\n",
499 GNUNET_i2s (&s->target),
501 plugin->env->session_end (plugin->env->cls, &s->target, s);
503 next = plugin->msg_head;
508 if (msgw->session != s)
510 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
511 if (NULL != msgw->cont)
512 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR,
514 GNUNET_free (msgw->msg);
516 removed = GNUNET_YES;
518 GNUNET_assert (GNUNET_YES ==
519 GNUNET_CONTAINER_multihashmap_remove (plugin->session_map,
520 &s->target.hashPubKey,
522 GNUNET_STATISTICS_set (plugin->env->stats,
523 "# UNIX sessions active",
524 GNUNET_CONTAINER_multihashmap_size (plugin->session_map),
526 if ((GNUNET_YES == removed) && (NULL == plugin->msg_head))
527 reschedule_select (plugin);
528 if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task)
530 GNUNET_SCHEDULER_cancel (s->timeout_task);
531 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
538 * Actually send out the message, assume we've got the address and
539 * send_handle squared away!
542 * @param send_handle which handle to send message on
543 * @param target who should receive this message (ignored by UNIX)
544 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
545 * @param msgbuf_size the size of the msgbuf to send
546 * @param priority how important is the message (ignored by UNIX)
547 * @param timeout when should we time out (give up) if we can not transmit?
548 * @param addr the addr to send the message to, needs to be a sockaddr for us
549 * @param addrlen the len of addr
550 * @param payload bytes payload to send
551 * @param cont continuation to call once the message has
552 * been transmitted (or if the transport is ready
553 * for the next transmission call; or if the
554 * peer disconnected...)
555 * @param cont_cls closure for cont
556 * @return on success the number of bytes written, RETRY for retry, -1 on errors
559 unix_real_send (void *cls,
560 struct GNUNET_NETWORK_Handle *send_handle,
561 const struct GNUNET_PeerIdentity *target, const char *msgbuf,
562 size_t msgbuf_size, unsigned int priority,
563 struct GNUNET_TIME_Absolute timeout,
564 const struct UnixAddress *addr,
567 GNUNET_TRANSPORT_TransmitContinuation cont,
570 struct Plugin *plugin = cls;
574 struct sockaddr_un un;
575 const char *unix_path;
578 GNUNET_assert (NULL != plugin);
579 if (NULL == send_handle)
581 GNUNET_break (0); /* We do not have a send handle */
582 return GNUNET_SYSERR;
584 if ((NULL == addr) || (0 == addrlen))
586 GNUNET_break (0); /* Can never send if we don't have an address */
587 return GNUNET_SYSERR;
590 /* Prepare address */
591 unix_path = (const char *) &addr[1];
592 memset (&un, 0, sizeof (un));
593 un.sun_family = AF_UNIX;
594 strncpy (un.sun_path, unix_path, sizeof (un.sun_path) - 1);
595 #if HAVE_SOCKADDR_IN_SIN_LEN
596 un.sun_len = (u_char) sizeof (struct sockaddr_un);
598 sb = (struct sockaddr *) &un;
599 sbs = sizeof (struct sockaddr_un);
603 sent = GNUNET_NETWORK_socket_sendto (send_handle, msgbuf, msgbuf_size, sb, sbs);
605 if (GNUNET_SYSERR == sent)
607 if ( (EAGAIN == errno) ||
609 return RETRY; /* We have to retry later */
610 if (EMSGSIZE == errno)
613 socklen_t len = sizeof (size);
615 GNUNET_NETWORK_socket_getsockopt ((struct GNUNET_NETWORK_Handle *)
616 send_handle, SOL_SOCKET, SO_SNDBUF, &size,
618 if (size < msgbuf_size)
620 LOG (GNUNET_ERROR_TYPE_DEBUG,
621 "Trying to increase socket buffer size from %i to %i for message size %i\n",
622 size, ((msgbuf_size / 1000) + 2) * 1000, msgbuf_size);
623 size = ((msgbuf_size / 1000) + 2) * 1000;
624 if (GNUNET_OK == GNUNET_NETWORK_socket_setsockopt
625 ((struct GNUNET_NETWORK_Handle *) send_handle, SOL_SOCKET, SO_SNDBUF,
626 &size, sizeof (size)))
627 goto resend; /* Increased buffer size, retry sending */
630 /* Could not increase buffer size: error, no retry */
631 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "setsockopt");
632 return GNUNET_SYSERR;
637 /* Buffer is bigger than message: error, no retry
638 * This should never happen!*/
640 return GNUNET_SYSERR;
645 LOG (GNUNET_ERROR_TYPE_DEBUG,
646 "UNIX transmit %u-byte message to %s (%d: %s)\n",
647 (unsigned int) msgbuf_size,
648 GNUNET_a2s (sb, sbs),
650 (sent < 0) ? STRERROR (errno) : "ok");
656 * Closure for 'get_session_it'.
658 struct GetSessionIteratorContext
661 * Location to store the session, if found.
666 * Address information.
671 * Number of bytes in 'address'
678 * Function called to find a session by address.
680 * @param cls the 'struct LookupCtx'
681 * @param key peer we are looking for (unused)
682 * @param value a session
683 * @return GNUNET_YES if not found (continue looking), GNUNET_NO on success
686 get_session_it (void *cls,
687 const struct GNUNET_HashCode *key,
690 struct GetSessionIteratorContext *gsi = cls;
691 struct Session *s = value;
693 if ((GNUNET_NO == s->inbound) && (gsi->addrlen == s->addrlen) &&
694 (0 == memcmp (gsi->address, s->addr, s->addrlen)) )
704 * Session was idle for too long, so disconnect it
706 * @param cls the 'struct Session' to disconnect
707 * @param tc scheduler context
710 session_timeout (void *cls,
711 const struct GNUNET_SCHEDULER_TaskContext *tc)
713 struct Session *s = cls;
715 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
716 LOG (GNUNET_ERROR_TYPE_DEBUG,
717 "Session %p was idle for %s, disconnecting\n",
719 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
721 disconnect_session (s);
726 * Function obtain the network type for a session
728 * @param cls closure ('struct Plugin*')
729 * @param session the session
730 * @return the network type in HBO or GNUNET_SYSERR
732 static enum GNUNET_ATS_Network_Type
733 unix_get_network (void *cls,
734 struct Session *session)
736 GNUNET_assert (NULL != session);
737 return GNUNET_ATS_NET_LOOPBACK;
742 * Creates a new outbound session the transport service will use to send data to the
745 * @param cls the plugin
746 * @param address the address
747 * @return the session or NULL of max connections exceeded
749 static struct Session *
750 unix_plugin_get_session (void *cls,
751 const struct GNUNET_HELLO_Address *address)
753 struct Plugin *plugin = cls;
755 struct GetSessionIteratorContext gsi;
756 struct UnixAddress *ua;
758 uint32_t addr_str_len;
760 GNUNET_assert (NULL != plugin);
761 GNUNET_assert (NULL != address);
763 ua = (struct UnixAddress *) address->address;
764 if ((NULL == address->address) || (0 == address->address_length) ||
765 (sizeof (struct UnixAddress) > address->address_length))
770 addrstr = (char *) &ua[1];
771 addr_str_len = ntohl (ua->addrlen);
772 if (addr_str_len != address->address_length - sizeof (struct UnixAddress))
774 /* This can be a legacy address */
778 if ('\0' != addrstr[addr_str_len - 1])
783 if (strlen (addrstr) + 1 != addr_str_len)
789 /* Check if already existing */
790 gsi.address = (const char *) address->address;
791 gsi.addrlen = address->address_length;
793 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->session_map,
794 &address->peer.hashPubKey,
795 &get_session_it, &gsi);
798 LOG (GNUNET_ERROR_TYPE_DEBUG,
799 "Found existing session\n");
803 /* create a new session */
804 s = GNUNET_malloc (sizeof (struct Session) + address->address_length);
805 s->addr = (struct UnixAddress *) &s[1];
806 s->addrlen = address->address_length;
808 s->inbound = GNUNET_NO;
809 memcpy (s->addr, address->address, address->address_length);
810 memcpy (&s->target, &address->peer, sizeof (struct GNUNET_PeerIdentity));
811 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s->timeout_task);
812 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
815 LOG (GNUNET_ERROR_TYPE_DEBUG,
816 "Creating a new session %p for address `%s'\n",
817 s, unix_address_to_string (NULL, address->address, address->address_length));
818 (void) GNUNET_CONTAINER_multihashmap_put (plugin->session_map,
819 &address->peer.hashPubKey, s,
820 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
821 GNUNET_STATISTICS_set (plugin->env->stats,
822 "# UNIX sessions active",
823 GNUNET_CONTAINER_multihashmap_size (plugin->session_map),
830 * Function that can be used by the transport service to transmit
831 * a message using the plugin. Note that in the case of a
832 * peer disconnecting, the continuation MUST be called
833 * prior to the disconnect notification itself. This function
834 * will be called with this peer's HELLO message to initiate
835 * a fresh connection to another peer.
838 * @param session which session must be used
839 * @param msgbuf the message to transmit
840 * @param msgbuf_size number of bytes in 'msgbuf'
841 * @param priority how important is the message (most plugins will
842 * ignore message priority and just FIFO)
843 * @param to how long to wait at most for the transmission (does not
844 * require plugins to discard the message after the timeout,
845 * just advisory for the desired delay; most plugins will ignore
847 * @param cont continuation to call once the message has
848 * been transmitted (or if the transport is ready
849 * for the next transmission call; or if the
850 * peer disconnected...); can be NULL
851 * @param cont_cls closure for cont
852 * @return number of bytes used (on the physical network, with overheads);
853 * -1 on hard errors (i.e. address invalid); 0 is a legal value
854 * and does NOT mean that the message was not transmitted (DV)
857 unix_plugin_send (void *cls,
858 struct Session *session,
859 const char *msgbuf, size_t msgbuf_size,
860 unsigned int priority,
861 struct GNUNET_TIME_Relative to,
862 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
864 struct Plugin *plugin = cls;
865 struct UNIXMessageWrapper *wrapper;
866 struct UNIXMessage *message;
869 GNUNET_assert (NULL != plugin);
870 GNUNET_assert (NULL != session);
873 GNUNET_CONTAINER_multihashmap_contains_value (plugin->session_map,
874 &session->target.hashPubKey,
877 LOG (GNUNET_ERROR_TYPE_ERROR,
878 "Invalid session for peer `%s' `%s'\n",
879 GNUNET_i2s (&session->target),
880 (const char *) session->addr);
882 return GNUNET_SYSERR;
884 LOG (GNUNET_ERROR_TYPE_DEBUG,
885 "Sending %u bytes with session for peer `%s' `%s'\n",
887 GNUNET_i2s (&session->target),
888 (const char *) session->addr);
889 ssize = sizeof (struct UNIXMessage) + msgbuf_size;
890 message = GNUNET_malloc (sizeof (struct UNIXMessage) + msgbuf_size);
891 message->header.size = htons (ssize);
892 message->header.type = htons (0);
893 memcpy (&message->sender, plugin->env->my_identity,
894 sizeof (struct GNUNET_PeerIdentity));
895 memcpy (&message[1], msgbuf, msgbuf_size);
896 reschedule_session_timeout (session);
897 wrapper = GNUNET_malloc (sizeof (struct UNIXMessageWrapper));
898 wrapper->msg = message;
899 wrapper->msgsize = ssize;
900 wrapper->payload = msgbuf_size;
901 wrapper->priority = priority;
902 wrapper->timeout = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(), to);
903 wrapper->cont = cont;
904 wrapper->cont_cls = cont_cls;
905 wrapper->session = session;
906 GNUNET_CONTAINER_DLL_insert (plugin->msg_head,
909 plugin->bytes_in_queue += ssize;
910 GNUNET_STATISTICS_set (plugin->env->stats,
911 "# bytes currently in UNIX buffers",
912 plugin->bytes_in_queue,
914 if (GNUNET_NO == plugin->with_ws)
915 reschedule_select (plugin);
921 * Demultiplexer for UNIX messages
923 * @param plugin the main plugin for this transport
924 * @param sender from which peer the message was received
925 * @param currhdr pointer to the header of the message
926 * @param ua address to look for
927 * @param ua_len length of the address
930 unix_demultiplexer (struct Plugin *plugin, struct GNUNET_PeerIdentity *sender,
931 const struct GNUNET_MessageHeader *currhdr,
932 const struct UnixAddress *ua, size_t ua_len)
934 struct Session *s = NULL;
935 struct GNUNET_HELLO_Address * addr;
937 GNUNET_break (ntohl(plugin->ats_network.value) != GNUNET_ATS_NET_UNSPECIFIED);
939 GNUNET_assert (ua_len >= sizeof (struct UnixAddress));
941 LOG (GNUNET_ERROR_TYPE_DEBUG,
942 "Received message from %s\n",
943 unix_address_to_string(NULL, ua, ua_len));
944 GNUNET_STATISTICS_update (plugin->env->stats,
945 "# bytes received via UNIX",
946 ntohs (currhdr->size),
949 addr = GNUNET_HELLO_address_allocate (sender,
953 s = lookup_session (plugin, sender, ua, ua_len);
956 s = unix_plugin_get_session (plugin, addr);
957 s->inbound = GNUNET_YES;
958 /* Notify transport and ATS about new inbound session */
959 plugin->env->session_start (NULL, sender,
960 PLUGIN_NAME, NULL, 0, s, &plugin->ats_network, 1);
962 reschedule_session_timeout (s);
964 plugin->env->receive (plugin->env->cls, sender, currhdr, s,
965 (GNUNET_YES == s->inbound) ? NULL : (const char *) ua,
966 (GNUNET_YES == s->inbound) ? 0 : ua_len);
968 plugin->env->update_address_metrics (plugin->env->cls, sender,
969 (GNUNET_YES == s->inbound) ? NULL : (const char *) ua,
970 (GNUNET_YES == s->inbound) ? 0 : ua_len,
971 s, &plugin->ats_network, 1);
978 * Read from UNIX domain socket (it is ready).
980 * @param plugin the plugin
983 unix_plugin_select_read (struct Plugin *plugin)
985 char buf[65536] GNUNET_ALIGN;
986 struct UnixAddress *ua;
987 struct UNIXMessage *msg;
988 struct GNUNET_PeerIdentity sender;
989 struct sockaddr_un un;
995 const struct GNUNET_MessageHeader *currhdr;
999 addrlen = sizeof (un);
1000 memset (&un, 0, sizeof (un));
1003 GNUNET_NETWORK_socket_recvfrom (plugin->unix_sock.desc, buf, sizeof (buf),
1004 (struct sockaddr *) &un, &addrlen);
1006 if ((GNUNET_SYSERR == ret) && ((errno == EAGAIN) || (errno == ENOBUFS)))
1009 if (ret == GNUNET_SYSERR)
1011 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "recvfrom");
1016 LOG (GNUNET_ERROR_TYPE_DEBUG,
1017 "Read %d bytes from socket %s\n",
1022 GNUNET_assert (AF_UNIX == (un.sun_family));
1023 ua_len = sizeof (struct UnixAddress) + strlen (un.sun_path) + 1;
1024 ua = GNUNET_malloc (ua_len);
1025 ua->addrlen = htonl (strlen (&un.sun_path[0]) +1);
1026 ua->options = htonl (0);
1027 memcpy (&ua[1], &un.sun_path[0], strlen (un.sun_path) + 1);
1029 msg = (struct UNIXMessage *) buf;
1030 csize = ntohs (msg->header.size);
1031 if ((csize < sizeof (struct UNIXMessage)) || (csize > ret))
1033 GNUNET_break_op (0);
1037 msgbuf = (char *) &msg[1];
1038 memcpy (&sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
1040 tsize = csize - sizeof (struct UNIXMessage);
1041 while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
1043 currhdr = (struct GNUNET_MessageHeader *) &msgbuf[offset];
1044 csize = ntohs (currhdr->size);
1045 if ((csize < sizeof (struct GNUNET_MessageHeader)) ||
1046 (csize > tsize - offset))
1048 GNUNET_break_op (0);
1051 unix_demultiplexer (plugin, &sender, currhdr, ua, ua_len);
1059 * Write to UNIX domain socket (it is ready).
1061 * @param plugin the plugin
1064 unix_plugin_select_write (struct Plugin *plugin)
1067 struct UNIXMessageWrapper * msgw;
1069 while (NULL != (msgw = plugin->msg_tail))
1071 if (GNUNET_TIME_absolute_get_remaining (msgw->timeout).rel_value_us > 0)
1072 break; /* Message is ready for sending */
1073 /* Message has a timeout */
1074 LOG (GNUNET_ERROR_TYPE_DEBUG,
1075 "Timeout for message with %u bytes \n",
1076 (unsigned int) msgw->msgsize);
1077 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
1078 plugin->bytes_in_queue -= msgw->msgsize;
1079 GNUNET_STATISTICS_set (plugin->env->stats,
1080 "# bytes currently in UNIX buffers",
1081 plugin->bytes_in_queue, GNUNET_NO);
1082 GNUNET_STATISTICS_update (plugin->env->stats,
1083 "# UNIX bytes discarded",
1086 if (NULL != msgw->cont)
1087 msgw->cont (msgw->cont_cls,
1088 &msgw->session->target,
1092 GNUNET_free (msgw->msg);
1096 return; /* Nothing to send at the moment */
1098 sent = unix_real_send (plugin,
1099 plugin->unix_sock.desc,
1100 &msgw->session->target,
1101 (const char *) msgw->msg,
1105 msgw->session->addr,
1106 msgw->session->addrlen,
1108 msgw->cont, msgw->cont_cls);
1112 GNUNET_STATISTICS_update (plugin->env->stats,
1113 "# UNIX retry attempts",
1117 if (GNUNET_SYSERR == sent)
1119 /* failed and no retry */
1120 if (NULL != msgw->cont)
1121 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR, msgw->payload, 0);
1123 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, msgw);
1125 GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
1126 plugin->bytes_in_queue -= msgw->msgsize;
1127 GNUNET_STATISTICS_set (plugin->env->stats,
1128 "# bytes currently in UNIX buffers",
1129 plugin->bytes_in_queue, GNUNET_NO);
1130 GNUNET_STATISTICS_update (plugin->env->stats,
1131 "# UNIX bytes discarded",
1135 GNUNET_free (msgw->msg);
1139 /* successfully sent bytes */
1140 GNUNET_break (sent > 0);
1141 GNUNET_CONTAINER_DLL_remove (plugin->msg_head,
1144 GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
1145 plugin->bytes_in_queue -= msgw->msgsize;
1146 GNUNET_STATISTICS_set (plugin->env->stats,
1147 "# bytes currently in UNIX buffers",
1148 plugin->bytes_in_queue,
1150 GNUNET_STATISTICS_update (plugin->env->stats,
1151 "# bytes transmitted via UNIX",
1154 if (NULL != msgw->cont)
1155 msgw->cont (msgw->cont_cls, &msgw->session->target,
1159 GNUNET_free (msgw->msg);
1165 * We have been notified that our writeset has something to read. We don't
1166 * know which socket needs to be read, so we have to check each one
1167 * Then reschedule this function to be called again once more is available.
1169 * @param cls the plugin handle
1170 * @param tc the scheduling context (for rescheduling this function again)
1173 unix_plugin_select (void *cls,
1174 const struct GNUNET_SCHEDULER_TaskContext *tc)
1176 struct Plugin *plugin = cls;
1178 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1179 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1182 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1184 /* Ready to send data */
1185 GNUNET_assert (GNUNET_NETWORK_fdset_isset
1186 (tc->write_ready, plugin->unix_sock.desc));
1187 if (NULL != plugin->msg_head)
1188 unix_plugin_select_write (plugin);
1191 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1193 /* Ready to receive data */
1194 GNUNET_assert (GNUNET_NETWORK_fdset_isset
1195 (tc->read_ready, plugin->unix_sock.desc));
1196 unix_plugin_select_read (plugin);
1198 reschedule_select (plugin);
1203 * Create a slew of UNIX sockets. If possible, use IPv6 and IPv4.
1205 * @param cls closure for server start, should be a struct Plugin *
1206 * @return number of sockets created or #GNUNET_SYSERR on error
1209 unix_transport_server_start (void *cls)
1211 struct Plugin *plugin = cls;
1212 struct sockaddr *serverAddr;
1214 struct sockaddr_un un;
1216 memset (&un, 0, sizeof (un));
1217 un.sun_family = AF_UNIX;
1218 strncpy (un.sun_path, plugin->unix_socket_path, sizeof (un.sun_path) - 1);
1219 #if HAVE_SOCKADDR_IN_SIN_LEN
1220 un.sun_len = (u_char) sizeof (struct sockaddr_un);
1223 serverAddr = (struct sockaddr *) &un;
1224 addrlen = sizeof (struct sockaddr_un);
1225 plugin->ats_network = plugin->env->get_address_type (plugin->env->cls, serverAddr, addrlen);
1226 plugin->unix_sock.desc =
1227 GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_DGRAM, 0);
1228 if (NULL == plugin->unix_sock.desc)
1230 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
1231 return GNUNET_SYSERR;
1234 GNUNET_NETWORK_socket_bind (plugin->unix_sock.desc, serverAddr, addrlen))
1236 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
1237 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc);
1238 plugin->unix_sock.desc = NULL;
1239 return GNUNET_SYSERR;
1241 LOG (GNUNET_ERROR_TYPE_DEBUG, "Bound to `%s'\n", plugin->unix_socket_path);
1242 plugin->rs = GNUNET_NETWORK_fdset_create ();
1243 plugin->ws = GNUNET_NETWORK_fdset_create ();
1244 GNUNET_NETWORK_fdset_zero (plugin->rs);
1245 GNUNET_NETWORK_fdset_zero (plugin->ws);
1246 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->unix_sock.desc);
1247 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->unix_sock.desc);
1249 reschedule_select (plugin);
1256 * Function called for a quick conversion of the binary address to
1257 * a numeric address. Note that the caller must not free the
1258 * address and that the next call to this function is allowed
1259 * to override the address again.
1261 * @param cls closure
1262 * @param addr binary address
1263 * @param addrlen length of the address
1264 * @return string representing the same address
1267 unix_address_to_string (void *cls, const void *addr, size_t addrlen)
1269 static char rbuf[1024];
1270 struct UnixAddress *ua = (struct UnixAddress *) addr;
1272 size_t addr_str_len;
1276 GNUNET_snprintf(rbuf, sizeof (rbuf), "%s", TRANSPORT_SESSION_INBOUND_STRING);
1278 if ((NULL == addr) || (sizeof (struct UnixAddress) > addrlen))
1283 addrstr = (char *) &ua[1];
1284 addr_str_len = ntohl (ua->addrlen);
1286 if (addr_str_len != addrlen - sizeof (struct UnixAddress))
1292 if ('\0' != addrstr[addr_str_len - 1])
1297 if (strlen (addrstr) + 1 != addr_str_len)
1303 GNUNET_snprintf(rbuf, sizeof (rbuf), "%s.%u.%s", PLUGIN_NAME, ntohl (ua->options), addrstr);
1308 * Function that will be called to check if a binary address for this
1309 * plugin is well-formed and corresponds to an address for THIS peer
1310 * (as per our configuration). Naturally, if absolutely necessary,
1311 * plugins can be a bit conservative in their answer, but in general
1312 * plugins should make sure that the address does not redirect
1313 * traffic to a 3rd party that might try to man-in-the-middle our
1316 * @param cls closure, should be our handle to the Plugin
1317 * @param addr pointer to the address
1318 * @param addrlen length of addr
1319 * @return GNUNET_OK if this is a plausible address for this peer
1320 * and transport, GNUNET_SYSERR if not
1324 unix_check_address (void *cls, const void *addr, size_t addrlen)
1326 struct Plugin* plugin = cls;
1327 struct UnixAddress *ua = (struct UnixAddress *) addr;
1329 size_t addr_str_len;
1331 if ((NULL == addr) || (0 == addrlen) || (sizeof (struct UnixAddress) > addrlen))
1334 return GNUNET_SYSERR;
1336 addrstr = (char *) &ua[1];
1337 addr_str_len = ntohl (ua->addrlen);
1338 if ('\0' != addrstr[addr_str_len - 1])
1341 return GNUNET_SYSERR;
1343 if (strlen (addrstr) + 1 != addr_str_len)
1346 return GNUNET_SYSERR;
1349 if (0 == strcmp (plugin->unix_socket_path, addrstr))
1351 return GNUNET_SYSERR;
1356 * Convert the transports address to a nice, human-readable
1359 * @param cls closure
1360 * @param type name of the transport that generated the address
1361 * @param addr one of the addresses of the host, NULL for the last address
1362 * the specific address format depends on the transport
1363 * @param addrlen length of the address
1364 * @param numeric should (IP) addresses be displayed in numeric form?
1365 * @param timeout after how long should we give up?
1366 * @param asc function to call on each string
1367 * @param asc_cls closure for asc
1370 unix_plugin_address_pretty_printer (void *cls, const char *type,
1371 const void *addr, size_t addrlen,
1373 struct GNUNET_TIME_Relative timeout,
1374 GNUNET_TRANSPORT_AddressStringCallback asc,
1377 if ((NULL != addr) && (addrlen > 0))
1379 asc (asc_cls, unix_address_to_string (NULL, addr, addrlen));
1381 else if (0 == addrlen)
1383 asc (asc_cls, TRANSPORT_SESSION_INBOUND_STRING);
1388 asc (asc_cls, "<invalid UNIX address>");
1390 asc (asc_cls, NULL);
1395 * Function called to convert a string address to
1398 * @param cls closure ('struct Plugin*')
1399 * @param addr string address
1400 * @param addrlen length of the address (strlen(addr) + '\0')
1401 * @param buf location to store the buffer
1402 * If the function returns GNUNET_SYSERR, its contents are undefined.
1403 * @param added length of created address
1404 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
1407 unix_string_to_address (void *cls, const char *addr, uint16_t addrlen,
1408 void **buf, size_t *added)
1410 struct UnixAddress *ua;
1417 /* Format unix.options.address */
1422 if ((NULL == addr) || (addrlen == 0))
1425 return GNUNET_SYSERR;
1427 if ('\0' != addr[addrlen - 1])
1430 return GNUNET_SYSERR;
1432 if (strlen (addr) != addrlen - 1)
1435 return GNUNET_SYSERR;
1437 plugin = GNUNET_strdup (addr);
1438 optionstr = strchr (plugin, '.');
1439 if (NULL == optionstr)
1442 GNUNET_free (plugin);
1443 return GNUNET_SYSERR;
1445 optionstr[0] = '\0';
1447 options = atol (optionstr);
1448 address = strchr (optionstr, '.');
1449 if (NULL == address)
1452 GNUNET_free (plugin);
1453 return GNUNET_SYSERR;
1457 if (0 != strcmp(plugin, PLUGIN_NAME))
1460 GNUNET_free (plugin);
1461 return GNUNET_SYSERR;
1464 ua_size = sizeof (struct UnixAddress) + strlen (address) + 1;
1465 ua = GNUNET_malloc (ua_size);
1466 ua->options = htonl (options);
1467 ua->addrlen = htonl (strlen (address) + 1);
1468 memcpy (&ua[1], address, strlen (address) + 1);
1469 GNUNET_free (plugin);
1478 * Notify transport service about address
1480 * @param cls the plugin
1484 address_notification (void *cls,
1485 const struct GNUNET_SCHEDULER_TaskContext *tc)
1487 struct Plugin *plugin = cls;
1489 struct UnixAddress *ua;
1491 len = sizeof (struct UnixAddress) + strlen (plugin->unix_socket_path) + 1;
1492 ua = GNUNET_malloc (len);
1493 ua->options = htonl (myoptions);
1494 ua->addrlen = htonl(strlen (plugin->unix_socket_path) + 1);
1495 memcpy (&ua[1], plugin->unix_socket_path, strlen (plugin->unix_socket_path) + 1);
1497 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1498 plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
1505 * Increment session timeout due to activity
1507 * @param s session for which the timeout should be moved
1510 reschedule_session_timeout (struct Session *s)
1512 GNUNET_assert (NULL != s);
1513 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s->timeout_task);
1514 GNUNET_SCHEDULER_cancel (s->timeout_task);
1515 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1518 LOG (GNUNET_ERROR_TYPE_DEBUG,
1519 "Timeout rescheduled for session %p set to %s\n",
1521 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1527 * Function called on sessions to disconnect
1529 * @param cls the plugin (unused)
1530 * @param key peer identity (unused)
1531 * @param value the 'struct Session' to disconnect
1532 * @return GNUNET_YES (always, continue to iterate)
1535 get_session_delete_it (void *cls, const struct GNUNET_HashCode * key, void *value)
1537 struct Session *s = value;
1539 disconnect_session (s);
1545 * Disconnect from a remote node. Clean up session if we have one for this peer
1547 * @param cls closure for this call (should be handle to Plugin)
1548 * @param target the peeridentity of the peer to disconnect
1549 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
1552 unix_disconnect (void *cls,
1553 const struct GNUNET_PeerIdentity *target)
1555 struct Plugin *plugin = cls;
1557 GNUNET_assert (plugin != NULL);
1558 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->session_map,
1559 &target->hashPubKey,
1560 &get_session_delete_it, plugin);
1565 * The exported method. Initializes the plugin and returns a
1566 * struct with the callbacks.
1568 * @param cls the plugin's execution environment
1569 * @return NULL on error, plugin functions otherwise
1572 libgnunet_plugin_transport_unix_init (void *cls)
1574 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1575 unsigned long long port;
1576 struct GNUNET_TRANSPORT_PluginFunctions *api;
1577 struct Plugin *plugin;
1578 int sockets_created;
1580 if (NULL == env->receive)
1582 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
1583 initialze the plugin or the API */
1584 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1586 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1587 api->address_to_string = &unix_address_to_string;
1588 api->string_to_address = &unix_string_to_address;
1592 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-unix", "PORT",
1594 port = UNIX_NAT_DEFAULT_PORT;
1595 plugin = GNUNET_malloc (sizeof (struct Plugin));
1596 plugin->port = port;
1598 GNUNET_asprintf (&plugin->unix_socket_path,
1599 "/tmp/unix-plugin-sock.%d",
1602 /* Initialize my flags */
1605 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1608 api->get_session = &unix_plugin_get_session;
1609 api->send = &unix_plugin_send;
1610 api->disconnect = &unix_disconnect;
1611 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1612 api->address_to_string = &unix_address_to_string;
1613 api->check_address = &unix_check_address;
1614 api->string_to_address = &unix_string_to_address;
1615 api->get_network = &unix_get_network;
1616 sockets_created = unix_transport_server_start (plugin);
1617 if (0 == sockets_created)
1618 LOG (GNUNET_ERROR_TYPE_WARNING,
1619 _("Failed to open UNIX listen socket\n"));
1620 plugin->session_map = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
1621 plugin->address_update_task = GNUNET_SCHEDULER_add_now (&address_notification, plugin);
1627 * Shutdown the plugin.
1629 * @param cls the plugin API returned from the initialization function
1630 * @return NULL (always)
1633 libgnunet_plugin_transport_unix_done (void *cls)
1635 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1636 struct Plugin *plugin = api->cls;
1637 struct UNIXMessageWrapper * msgw;
1638 struct UnixAddress *ua;
1647 len = sizeof (struct UnixAddress) + strlen (plugin->unix_socket_path) + 1;
1648 ua = GNUNET_malloc (len);
1649 ua->options = htonl (myoptions);
1650 ua->addrlen = htonl(strlen (plugin->unix_socket_path) + 1);
1651 memcpy (&ua[1], plugin->unix_socket_path, strlen (plugin->unix_socket_path) + 1);
1653 plugin->env->notify_address (plugin->env->cls, GNUNET_NO,
1656 while (NULL != (msgw = plugin->msg_head))
1658 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
1659 if (msgw->cont != NULL)
1660 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR,
1662 GNUNET_free (msgw->msg);
1666 if (GNUNET_SCHEDULER_NO_TASK != plugin->select_task)
1668 GNUNET_SCHEDULER_cancel (plugin->select_task);
1669 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1671 if (GNUNET_SCHEDULER_NO_TASK != plugin->address_update_task)
1673 GNUNET_SCHEDULER_cancel (plugin->address_update_task);
1674 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1676 if (NULL != plugin->unix_sock.desc)
1678 GNUNET_break (GNUNET_OK ==
1679 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc));
1680 plugin->unix_sock.desc = NULL;
1681 plugin->with_ws = GNUNET_NO;
1683 GNUNET_CONTAINER_multihashmap_iterate (plugin->session_map,
1684 &get_session_delete_it, plugin);
1685 GNUNET_CONTAINER_multihashmap_destroy (plugin->session_map);
1686 if (NULL != plugin->rs)
1687 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1688 if (NULL != plugin->ws)
1689 GNUNET_NETWORK_fdset_destroy (plugin->ws);
1690 GNUNET_free (plugin->unix_socket_path);
1691 GNUNET_free (plugin);
1696 /* end of plugin_transport_unix.c */