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_util_lib.h"
31 #include "gnunet_hello_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 GNUNET_HELLO_Address *address;
109 * Session timeout task
111 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
115 struct UNIXMessageWrapper
118 * We keep messages in a doubly linked list.
120 struct UNIXMessageWrapper *next;
123 * We keep messages in a doubly linked list.
125 struct UNIXMessageWrapper *prev;
128 * The actual payload (allocated separately right now).
130 struct UNIXMessage * msg;
133 * Session this message belongs to.
135 struct Session *session;
138 * Function to call upon transmission.
140 GNUNET_TRANSPORT_TransmitContinuation cont;
143 * Closure for 'cont'.
148 * Timeout for this message.
150 struct GNUNET_TIME_Absolute timeout;
153 * Number of bytes in 'msg'.
158 * Number of bytes of payload encapsulated in 'msg'.
163 * Priority of the message (ignored, just dragged along in UNIX).
165 unsigned int priority;
170 * Encapsulation of all of the state of the plugin.
182 * Stored in a linked list.
184 struct PeerSession *next;
187 * Pointer to the global plugin struct.
189 struct Plugin *plugin;
192 * To whom are we talking to (set to our identity
193 * if we are still waiting for the welcome message)
195 struct GNUNET_PeerIdentity target;
198 * Address of the other peer (either based on our 'connect'
199 * call or on our 'accept' call).
204 * Length of connect_addr.
209 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
211 int expecting_welcome;
214 * From which socket do we need to send to this peer?
216 struct GNUNET_NETWORK_Handle *sock;
219 * Queue of messages for this peer, in the case that
220 * we have to await a connection...
222 struct MessageQueue *messages;
228 * Information we keep for each of our listen sockets.
230 struct UNIX_Sock_Info
235 struct GNUNET_NETWORK_Handle *desc;
238 * The port we bound to (not an actual PORT, as UNIX domain sockets
239 * don't have ports, but rather a number in the path name to make this
247 * Encapsulation of all of the state of the plugin.
253 * ID of task used to update our addresses when one expires.
255 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
260 GNUNET_SCHEDULER_TaskIdentifier select_task;
263 * Number of bytes we currently have in our write queue.
265 unsigned long long bytes_in_queue;
270 struct GNUNET_TRANSPORT_PluginEnvironment *env;
275 struct GNUNET_CONTAINER_MultiPeerMap *session_map;
280 struct GNUNET_NETWORK_FDSet *rs;
285 struct GNUNET_NETWORK_FDSet *ws;
288 * Path of our unix domain socket (/tmp/unix-plugin-PORT)
290 char *unix_socket_path;
293 * Head of queue of messages to transmit.
295 struct UNIXMessageWrapper *msg_head;
298 * Tail of queue of messages to transmit.
300 struct UNIXMessageWrapper *msg_tail;
303 * socket that we transmit all data with
305 struct UNIX_Sock_Info unix_sock;
310 struct GNUNET_ATS_Information ats_network;
313 * Is the write set in the current 'select' task? GNUNET_NO if the
314 * write queue was empty when the main task was scheduled,
315 * GNUNET_YES if we're already waiting for being allowed to write.
320 * Integer to append to unix domain socket.
328 * Increment session timeout due to activity
330 * @param s session for which the timeout should be moved
333 reschedule_session_timeout (struct Session *s);
337 * We have been notified that our writeset has something to read. We don't
338 * know which socket needs to be read, so we have to check each one
339 * Then reschedule this function to be called again once more is available.
341 * @param cls the plugin handle
342 * @param tc the scheduling context (for rescheduling this function again)
345 unix_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
349 * Function called for a quick conversion of the binary address to
350 * a numeric address. Note that the caller must not free the
351 * address and that the next call to this function is allowed
352 * to override the address again.
355 * @param addr binary address
356 * @param addrlen length of the address
357 * @return string representing the same address
360 unix_address_to_string (void *cls, const void *addr, size_t addrlen)
362 static char rbuf[1024];
363 struct UnixAddress *ua = (struct UnixAddress *) addr;
367 if ((NULL == addr) || (sizeof (struct UnixAddress) > addrlen))
372 addrstr = (char *) &ua[1];
373 addr_str_len = ntohl (ua->addrlen);
375 if (addr_str_len != addrlen - sizeof(struct UnixAddress))
381 if ('\0' != addrstr[addr_str_len - 1])
386 if (strlen (addrstr) + 1 != addr_str_len)
392 GNUNET_snprintf (rbuf, sizeof(rbuf), "%s.%u.%s", PLUGIN_NAME,
393 ntohl (ua->options), addrstr);
398 static struct sockaddr_un *
399 unix_address_to_sockaddr (const char *unixpath,
402 struct sockaddr_un *un;
405 GNUNET_assert (0 < strlen (unixpath)); /* sanity check */
406 un = GNUNET_new (struct sockaddr_un);
407 un->sun_family = AF_UNIX;
408 slen = strlen (unixpath);
409 if (slen >= sizeof (un->sun_path))
410 slen = sizeof (un->sun_path) - 1;
411 memcpy (un->sun_path, unixpath, slen);
412 un->sun_path[slen] = '\0';
413 slen = sizeof (struct sockaddr_un);
414 #if HAVE_SOCKADDR_IN_SIN_LEN
415 un->sun_len = (u_char) slen;
423 * Re-schedule the main 'select' callback (unix_plugin_select)
426 * @param plugin the plugin context
429 reschedule_select (struct Plugin * plugin)
431 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
433 GNUNET_SCHEDULER_cancel (plugin->select_task);
434 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
436 if (NULL != plugin->msg_head)
438 plugin->select_task =
439 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
440 GNUNET_TIME_UNIT_FOREVER_REL,
443 &unix_plugin_select, plugin);
444 plugin->with_ws = GNUNET_YES;
448 plugin->select_task =
449 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
450 GNUNET_TIME_UNIT_FOREVER_REL,
453 &unix_plugin_select, plugin);
454 plugin->with_ws = GNUNET_NO;
460 * Closure to #lookup_session_it.
465 * Location to store the session, if found.
469 struct GNUNET_HELLO_Address *address;
474 * Function called to find a session by address.
476 * @param cls the 'struct LookupCtx'
477 * @param key peer we are looking for (unused)
478 * @param value a session
479 * @return #GNUNET_YES if not found (continue looking), #GNUNET_NO on success
482 lookup_session_it (void *cls,
483 const struct GNUNET_PeerIdentity * key,
486 struct LookupCtx *lctx = cls;
487 struct Session *s = value;
489 if (0 == GNUNET_HELLO_address_cmp (lctx->address, s->address))
499 * Find an existing session by address.
501 * @param plugin the plugin
502 * @param sender for which peer should the session be?
503 * @param ua address to look for
504 * @param ua_len length of the address
505 * @return NULL if session was not found
507 static struct Session *
508 lookup_session (struct Plugin *plugin,
509 struct GNUNET_HELLO_Address *address)
511 struct LookupCtx lctx;
513 lctx.address = address;
515 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->session_map,
517 &lookup_session_it, &lctx);
523 * Functions with this signature are called whenever we need
524 * to close a session due to a disconnect or failure to
525 * establish a connection.
527 * @param cls closure with the `struct Plugin`
528 * @param s session to close down
529 * @return #GNUNET_OK on success
532 unix_session_disconnect (void *cls,
535 struct Plugin *plugin = cls;
536 struct UNIXMessageWrapper *msgw;
537 struct UNIXMessageWrapper *next;
540 LOG (GNUNET_ERROR_TYPE_DEBUG,
541 "Disconnecting session for peer `%s' `%s'\n",
542 GNUNET_i2s (&s->target),
543 unix_address_to_string (NULL, s->address->address, s->address->address_length) );
544 plugin->env->session_end (plugin->env->cls, &s->target, s);
546 next = plugin->msg_head;
551 if (msgw->session != s)
553 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
554 if (NULL != msgw->cont)
555 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR,
557 GNUNET_free (msgw->msg);
559 removed = GNUNET_YES;
561 GNUNET_assert (GNUNET_YES ==
562 GNUNET_CONTAINER_multipeermap_remove (plugin->session_map,
565 GNUNET_STATISTICS_set (plugin->env->stats,
566 "# UNIX sessions active",
567 GNUNET_CONTAINER_multipeermap_size (plugin->session_map),
569 if ((GNUNET_YES == removed) && (NULL == plugin->msg_head))
570 reschedule_select (plugin);
571 if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task)
573 GNUNET_SCHEDULER_cancel (s->timeout_task);
574 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
576 GNUNET_HELLO_address_free (s->address);
583 * Function that is called to get the keepalive factor.
584 * GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
585 * calculate the interval between keepalive packets.
587 * @param cls closure with the `struct Plugin`
588 * @return keepalive factor
591 unix_query_keepalive_factor (void *cls)
598 * Actually send out the message, assume we've got the address and
599 * send_handle squared away!
602 * @param send_handle which handle to send message on
603 * @param target who should receive this message (ignored by UNIX)
604 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
605 * @param msgbuf_size the size of the msgbuf to send
606 * @param priority how important is the message (ignored by UNIX)
607 * @param timeout when should we time out (give up) if we can not transmit?
608 * @param addr the addr to send the message to, needs to be a sockaddr for us
609 * @param addrlen the len of @a addr
610 * @param payload bytes payload to send
611 * @param cont continuation to call once the message has
612 * been transmitted (or if the transport is ready
613 * for the next transmission call; or if the
614 * peer disconnected...)
615 * @param cont_cls closure for @a cont
616 * @return on success the number of bytes written, RETRY for retry, -1 on errors
619 unix_real_send (void *cls,
620 struct GNUNET_NETWORK_Handle *send_handle,
621 const struct GNUNET_PeerIdentity *target, const char *msgbuf,
622 size_t msgbuf_size, unsigned int priority,
623 struct GNUNET_TIME_Absolute timeout,
624 const struct UnixAddress *addr,
627 GNUNET_TRANSPORT_TransmitContinuation cont,
630 struct Plugin *plugin = cls;
632 struct sockaddr_un *un;
634 const char *unixpath;
636 GNUNET_assert (NULL != plugin);
637 if (NULL == send_handle)
639 GNUNET_break (0); /* We do not have a send handle */
640 return GNUNET_SYSERR;
642 if ((NULL == addr) || (0 == addrlen))
644 GNUNET_break (0); /* Can never send if we don't have an address */
645 return GNUNET_SYSERR;
648 /* Prepare address */
649 unixpath = (const char *) &addr[1];
650 if (NULL == (un = unix_address_to_sockaddr (unixpath, &un_len)))
658 sent = GNUNET_NETWORK_socket_sendto (send_handle, msgbuf, msgbuf_size,
659 (const struct sockaddr *) un, un_len);
660 if (GNUNET_SYSERR == sent)
662 if ( (EAGAIN == errno) ||
666 return RETRY; /* We have to retry later */
668 if (EMSGSIZE == errno)
671 socklen_t len = sizeof (size);
673 GNUNET_NETWORK_socket_getsockopt ((struct GNUNET_NETWORK_Handle *)
674 send_handle, SOL_SOCKET, SO_SNDBUF, &size,
676 if (size < msgbuf_size)
678 LOG (GNUNET_ERROR_TYPE_DEBUG,
679 "Trying to increase socket buffer size from %i to %i for message size %i\n",
680 size, ((msgbuf_size / 1000) + 2) * 1000, msgbuf_size);
681 size = ((msgbuf_size / 1000) + 2) * 1000;
682 if (GNUNET_OK == GNUNET_NETWORK_socket_setsockopt
683 ((struct GNUNET_NETWORK_Handle *) send_handle, SOL_SOCKET, SO_SNDBUF,
684 &size, sizeof (size)))
685 goto resend; /* Increased buffer size, retry sending */
688 /* Could not increase buffer size: error, no retry */
689 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "setsockopt");
691 return GNUNET_SYSERR;
696 /* Buffer is bigger than message: error, no retry
697 * This should never happen!*/
700 return GNUNET_SYSERR;
705 LOG (GNUNET_ERROR_TYPE_DEBUG,
706 "UNIX transmit %u-byte message to %s (%d: %s)\n",
707 (unsigned int) msgbuf_size,
708 GNUNET_a2s ((const struct sockaddr *)un, un_len),
710 (sent < 0) ? STRERROR (errno) : "ok");
717 * Closure for 'get_session_it'.
719 struct GetSessionIteratorContext
722 * Location to store the session, if found.
727 * Address information.
729 const struct GNUNET_HELLO_Address *address;
734 * Function called to find a session by address.
736 * @param cls the 'struct LookupCtx'
737 * @param key peer we are looking for (unused)
738 * @param value a session
739 * @return #GNUNET_YES if not found (continue looking), #GNUNET_NO on success
742 get_session_it (void *cls,
743 const struct GNUNET_PeerIdentity *key,
746 struct GetSessionIteratorContext *gsi = cls;
747 struct Session *s = value;
749 if (0 == GNUNET_HELLO_address_cmp(s->address, gsi->address))
759 * Session was idle for too long, so disconnect it
761 * @param cls the 'struct Session' to disconnect
762 * @param tc scheduler context
765 session_timeout (void *cls,
766 const struct GNUNET_SCHEDULER_TaskContext *tc)
768 struct Session *s = cls;
770 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
771 LOG (GNUNET_ERROR_TYPE_DEBUG,
772 "Session %p was idle for %s, disconnecting\n",
774 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
776 unix_session_disconnect (s->plugin, s);
781 * Function obtain the network type for a session
783 * @param cls closure ('struct Plugin*')
784 * @param session the session
785 * @return the network type in HBO or #GNUNET_SYSERR
787 static enum GNUNET_ATS_Network_Type
788 unix_get_network (void *cls,
789 struct Session *session)
791 GNUNET_assert (NULL != session);
792 return GNUNET_ATS_NET_LOOPBACK;
797 * Creates a new outbound session the transport service will use to send data to the
800 * @param cls the plugin
801 * @param address the address
802 * @return the session or NULL of max connections exceeded
804 static struct Session *
805 unix_plugin_get_session (void *cls,
806 const struct GNUNET_HELLO_Address *address)
808 struct Plugin *plugin = cls;
810 struct GetSessionIteratorContext gsi;
811 struct UnixAddress *ua;
813 uint32_t addr_str_len;
815 GNUNET_assert (NULL != plugin);
816 GNUNET_assert (NULL != address);
818 ua = (struct UnixAddress *) address->address;
819 if ((NULL == address->address) || (0 == address->address_length) ||
820 (sizeof (struct UnixAddress) > address->address_length))
825 addrstr = (char *) &ua[1];
826 addr_str_len = ntohl (ua->addrlen);
827 if (addr_str_len != address->address_length - sizeof (struct UnixAddress))
829 /* This can be a legacy address */
833 if ('\0' != addrstr[addr_str_len - 1])
838 if (strlen (addrstr) + 1 != addr_str_len)
844 /* Check if already existing */
845 gsi.address = address;
847 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->session_map,
849 &get_session_it, &gsi);
852 LOG (GNUNET_ERROR_TYPE_DEBUG, "Found existing session %p for address `%s'\n",
854 unix_address_to_string (NULL, address->address, address->address_length));
858 /* create a new session */
859 s = GNUNET_new (struct Session);
860 s->target = address->peer;
861 s->address = GNUNET_HELLO_address_copy (address);
862 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s->timeout_task);
863 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
866 LOG (GNUNET_ERROR_TYPE_DEBUG,
867 "Creating a new session %p for address `%s'\n",
868 s, unix_address_to_string (NULL, address->address, address->address_length));
869 (void) GNUNET_CONTAINER_multipeermap_put (plugin->session_map,
871 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
872 GNUNET_STATISTICS_set (plugin->env->stats,
873 "# UNIX sessions active",
874 GNUNET_CONTAINER_multipeermap_size (plugin->session_map),
880 unix_plugin_update_session_timeout (void *cls,
881 const struct GNUNET_PeerIdentity *peer,
882 struct Session *session)
884 struct Plugin *plugin = cls;
887 GNUNET_CONTAINER_multipeermap_contains_value (plugin->session_map,
891 reschedule_session_timeout (session);
895 * Function that can be used by the transport service to transmit
896 * a message using the plugin. Note that in the case of a
897 * peer disconnecting, the continuation MUST be called
898 * prior to the disconnect notification itself. This function
899 * will be called with this peer's HELLO message to initiate
900 * a fresh connection to another peer.
903 * @param session which session must be used
904 * @param msgbuf the message to transmit
905 * @param msgbuf_size number of bytes in @a msgbuf
906 * @param priority how important is the message (most plugins will
907 * ignore message priority and just FIFO)
908 * @param to how long to wait at most for the transmission (does not
909 * require plugins to discard the message after the timeout,
910 * just advisory for the desired delay; most plugins will ignore
912 * @param cont continuation to call once the message has
913 * been transmitted (or if the transport is ready
914 * for the next transmission call; or if the
915 * peer disconnected...); can be NULL
916 * @param cont_cls closure for @a cont
917 * @return number of bytes used (on the physical network, with overheads);
918 * -1 on hard errors (i.e. address invalid); 0 is a legal value
919 * and does NOT mean that the message was not transmitted (DV)
922 unix_plugin_send (void *cls,
923 struct Session *session,
924 const char *msgbuf, size_t msgbuf_size,
925 unsigned int priority,
926 struct GNUNET_TIME_Relative to,
927 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
929 struct Plugin *plugin = cls;
930 struct UNIXMessageWrapper *wrapper;
931 struct UNIXMessage *message;
935 GNUNET_CONTAINER_multipeermap_contains_value (plugin->session_map,
939 LOG (GNUNET_ERROR_TYPE_ERROR,
940 "Invalid session for peer `%s' `%s'\n",
941 GNUNET_i2s (&session->target),
942 unix_address_to_string(NULL, session->address->address,
943 session->address->address_length));
945 return GNUNET_SYSERR;
947 LOG (GNUNET_ERROR_TYPE_DEBUG,
948 "Sending %u bytes with session for peer `%s' `%s'\n",
950 GNUNET_i2s (&session->target),
951 unix_address_to_string(NULL, session->address->address,
952 session->address->address_length));
953 ssize = sizeof (struct UNIXMessage) + msgbuf_size;
954 message = GNUNET_malloc (sizeof (struct UNIXMessage) + msgbuf_size);
955 message->header.size = htons (ssize);
956 message->header.type = htons (0);
957 memcpy (&message->sender, plugin->env->my_identity,
958 sizeof (struct GNUNET_PeerIdentity));
959 memcpy (&message[1], msgbuf, msgbuf_size);
961 wrapper = GNUNET_new (struct UNIXMessageWrapper);
962 wrapper->msg = message;
963 wrapper->msgsize = ssize;
964 wrapper->payload = msgbuf_size;
965 wrapper->priority = priority;
966 wrapper->timeout = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(), to);
967 wrapper->cont = cont;
968 wrapper->cont_cls = cont_cls;
969 wrapper->session = session;
970 GNUNET_CONTAINER_DLL_insert (plugin->msg_head,
973 plugin->bytes_in_queue += ssize;
974 GNUNET_STATISTICS_set (plugin->env->stats,
975 "# bytes currently in UNIX buffers",
976 plugin->bytes_in_queue,
978 if (GNUNET_NO == plugin->with_ws)
979 reschedule_select (plugin);
985 * Demultiplexer for UNIX messages
987 * @param plugin the main plugin for this transport
988 * @param sender from which peer the message was received
989 * @param currhdr pointer to the header of the message
990 * @param ua address to look for
991 * @param ua_len length of the address @a ua
994 unix_demultiplexer (struct Plugin *plugin, struct GNUNET_PeerIdentity *sender,
995 const struct GNUNET_MessageHeader *currhdr,
996 const struct UnixAddress *ua, size_t ua_len)
998 struct Session *s = NULL;
999 struct GNUNET_HELLO_Address *address;
1001 GNUNET_break (ntohl(plugin->ats_network.value) != GNUNET_ATS_NET_UNSPECIFIED);
1002 GNUNET_assert (ua_len >= sizeof (struct UnixAddress));
1003 LOG (GNUNET_ERROR_TYPE_DEBUG,
1004 "Received message from %s\n",
1005 unix_address_to_string(NULL, ua, ua_len));
1006 GNUNET_STATISTICS_update (plugin->env->stats,
1007 "# bytes received via UNIX",
1008 ntohs (currhdr->size),
1011 /* Look for existing session */
1012 address = GNUNET_HELLO_address_allocate (sender, PLUGIN_NAME, ua, ua_len,
1013 GNUNET_HELLO_ADDRESS_INFO_NONE); /* UNIX does not have "inbound" sessions */
1014 s = lookup_session (plugin, address);
1018 s = unix_plugin_get_session (plugin, address);
1019 /* Notify transport and ATS about new inbound session */
1020 plugin->env->session_start (NULL, s->address, s, &plugin->ats_network, 1);
1022 GNUNET_HELLO_address_free (address);
1023 reschedule_session_timeout (s);
1025 plugin->env->receive (plugin->env->cls, s->address, s, currhdr);
1026 plugin->env->update_address_metrics (plugin->env->cls, s->address, s,
1027 &plugin->ats_network, 1);
1032 * Read from UNIX domain socket (it is ready).
1034 * @param plugin the plugin
1037 unix_plugin_select_read (struct Plugin *plugin)
1039 char buf[65536] GNUNET_ALIGN;
1040 struct UnixAddress *ua;
1041 struct UNIXMessage *msg;
1042 struct GNUNET_PeerIdentity sender;
1043 struct sockaddr_un un;
1049 const struct GNUNET_MessageHeader *currhdr;
1053 addrlen = sizeof (un);
1054 memset (&un, 0, sizeof (un));
1057 GNUNET_NETWORK_socket_recvfrom (plugin->unix_sock.desc, buf, sizeof (buf),
1058 (struct sockaddr *) &un, &addrlen);
1060 if ((GNUNET_SYSERR == ret) && ((errno == EAGAIN) || (errno == ENOBUFS)))
1063 if (ret == GNUNET_SYSERR)
1065 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "recvfrom");
1070 LOG (GNUNET_ERROR_TYPE_DEBUG,
1071 "Read %d bytes from socket %s\n",
1076 GNUNET_assert (AF_UNIX == (un.sun_family));
1077 ua_len = sizeof (struct UnixAddress) + strlen (un.sun_path) + 1;
1078 ua = GNUNET_malloc (ua_len);
1079 ua->addrlen = htonl (strlen (&un.sun_path[0]) +1);
1080 ua->options = htonl (0);
1081 memcpy (&ua[1], &un.sun_path[0], strlen (un.sun_path) + 1);
1083 msg = (struct UNIXMessage *) buf;
1084 csize = ntohs (msg->header.size);
1085 if ((csize < sizeof (struct UNIXMessage)) || (csize > ret))
1087 GNUNET_break_op (0);
1091 msgbuf = (char *) &msg[1];
1092 memcpy (&sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
1094 tsize = csize - sizeof (struct UNIXMessage);
1095 while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
1097 currhdr = (struct GNUNET_MessageHeader *) &msgbuf[offset];
1098 csize = ntohs (currhdr->size);
1099 if ((csize < sizeof (struct GNUNET_MessageHeader)) ||
1100 (csize > tsize - offset))
1102 GNUNET_break_op (0);
1105 unix_demultiplexer (plugin, &sender, currhdr, ua, ua_len);
1113 * Write to UNIX domain socket (it is ready).
1115 * @param plugin the plugin
1118 unix_plugin_select_write (struct Plugin *plugin)
1121 struct UNIXMessageWrapper * msgw;
1123 while (NULL != (msgw = plugin->msg_tail))
1125 if (GNUNET_TIME_absolute_get_remaining (msgw->timeout).rel_value_us > 0)
1126 break; /* Message is ready for sending */
1127 /* Message has a timeout */
1128 LOG (GNUNET_ERROR_TYPE_DEBUG,
1129 "Timeout for message with %u bytes \n",
1130 (unsigned int) msgw->msgsize);
1131 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
1132 plugin->bytes_in_queue -= msgw->msgsize;
1133 GNUNET_STATISTICS_set (plugin->env->stats,
1134 "# bytes currently in UNIX buffers",
1135 plugin->bytes_in_queue, GNUNET_NO);
1136 GNUNET_STATISTICS_update (plugin->env->stats,
1137 "# UNIX bytes discarded",
1140 if (NULL != msgw->cont)
1141 msgw->cont (msgw->cont_cls,
1142 &msgw->session->target,
1146 GNUNET_free (msgw->msg);
1150 return; /* Nothing to send at the moment */
1152 sent = unix_real_send (plugin,
1153 plugin->unix_sock.desc,
1154 &msgw->session->target,
1155 (const char *) msgw->msg,
1159 msgw->session->address->address,
1160 msgw->session->address->address_length,
1162 msgw->cont, msgw->cont_cls);
1166 GNUNET_STATISTICS_update (plugin->env->stats,
1167 "# UNIX retry attempts",
1171 if (GNUNET_SYSERR == sent)
1173 /* failed and no retry */
1174 if (NULL != msgw->cont)
1175 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR, msgw->payload, 0);
1177 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, msgw);
1179 GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
1180 plugin->bytes_in_queue -= msgw->msgsize;
1181 GNUNET_STATISTICS_set (plugin->env->stats,
1182 "# bytes currently in UNIX buffers",
1183 plugin->bytes_in_queue, GNUNET_NO);
1184 GNUNET_STATISTICS_update (plugin->env->stats,
1185 "# UNIX bytes discarded",
1189 GNUNET_free (msgw->msg);
1193 /* successfully sent bytes */
1194 GNUNET_break (sent > 0);
1195 GNUNET_CONTAINER_DLL_remove (plugin->msg_head,
1198 GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
1199 plugin->bytes_in_queue -= msgw->msgsize;
1200 GNUNET_STATISTICS_set (plugin->env->stats,
1201 "# bytes currently in UNIX buffers",
1202 plugin->bytes_in_queue,
1204 GNUNET_STATISTICS_update (plugin->env->stats,
1205 "# bytes transmitted via UNIX",
1208 if (NULL != msgw->cont)
1209 msgw->cont (msgw->cont_cls, &msgw->session->target,
1213 GNUNET_free (msgw->msg);
1219 * We have been notified that our writeset has something to read. We don't
1220 * know which socket needs to be read, so we have to check each one
1221 * Then reschedule this function to be called again once more is available.
1223 * @param cls the plugin handle
1224 * @param tc the scheduling context (for rescheduling this function again)
1227 unix_plugin_select (void *cls,
1228 const struct GNUNET_SCHEDULER_TaskContext *tc)
1230 struct Plugin *plugin = cls;
1232 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1233 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1236 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1238 /* Ready to send data */
1239 GNUNET_assert (GNUNET_NETWORK_fdset_isset
1240 (tc->write_ready, plugin->unix_sock.desc));
1241 if (NULL != plugin->msg_head)
1242 unix_plugin_select_write (plugin);
1245 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1247 /* Ready to receive data */
1248 GNUNET_assert (GNUNET_NETWORK_fdset_isset
1249 (tc->read_ready, plugin->unix_sock.desc));
1250 unix_plugin_select_read (plugin);
1252 reschedule_select (plugin);
1257 * Create a slew of UNIX sockets. If possible, use IPv6 and IPv4.
1259 * @param cls closure for server start, should be a struct Plugin *
1260 * @return number of sockets created or #GNUNET_SYSERR on error
1263 unix_transport_server_start (void *cls)
1265 struct Plugin *plugin = cls;
1266 struct sockaddr_un *un;
1269 un = unix_address_to_sockaddr (plugin->unix_socket_path, &un_len);
1270 plugin->ats_network = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) un, un_len);
1271 plugin->unix_sock.desc =
1272 GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_DGRAM, 0);
1273 if (NULL == plugin->unix_sock.desc)
1275 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
1276 return GNUNET_SYSERR;
1279 GNUNET_NETWORK_socket_bind (plugin->unix_sock.desc, (const struct sockaddr *) un, un_len))
1281 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
1282 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc);
1283 plugin->unix_sock.desc = NULL;
1285 return GNUNET_SYSERR;
1287 LOG (GNUNET_ERROR_TYPE_DEBUG, "Bound to `%s'\n", plugin->unix_socket_path);
1288 plugin->rs = GNUNET_NETWORK_fdset_create ();
1289 plugin->ws = GNUNET_NETWORK_fdset_create ();
1290 GNUNET_NETWORK_fdset_zero (plugin->rs);
1291 GNUNET_NETWORK_fdset_zero (plugin->ws);
1292 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->unix_sock.desc);
1293 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->unix_sock.desc);
1295 reschedule_select (plugin);
1302 * Function that will be called to check if a binary address for this
1303 * plugin is well-formed and corresponds to an address for THIS peer
1304 * (as per our configuration). Naturally, if absolutely necessary,
1305 * plugins can be a bit conservative in their answer, but in general
1306 * plugins should make sure that the address does not redirect
1307 * traffic to a 3rd party that might try to man-in-the-middle our
1310 * @param cls closure, should be our handle to the Plugin
1311 * @param addr pointer to the address
1312 * @param addrlen length of addr
1313 * @return GNUNET_OK if this is a plausible address for this peer
1314 * and transport, GNUNET_SYSERR if not
1318 unix_check_address (void *cls, const void *addr, size_t addrlen)
1320 struct Plugin* plugin = cls;
1321 struct UnixAddress *ua = (struct UnixAddress *) addr;
1323 size_t addr_str_len;
1325 if ((NULL == addr) || (0 == addrlen) || (sizeof (struct UnixAddress) > addrlen))
1328 return GNUNET_SYSERR;
1330 addrstr = (char *) &ua[1];
1331 addr_str_len = ntohl (ua->addrlen);
1332 if ('\0' != addrstr[addr_str_len - 1])
1335 return GNUNET_SYSERR;
1337 if (strlen (addrstr) + 1 != addr_str_len)
1340 return GNUNET_SYSERR;
1343 if (0 == strcmp (plugin->unix_socket_path, addrstr))
1345 return GNUNET_SYSERR;
1350 * Convert the transports address to a nice, human-readable
1353 * @param cls closure
1354 * @param type name of the transport that generated the address
1355 * @param addr one of the addresses of the host, NULL for the last address
1356 * the specific address format depends on the transport
1357 * @param addrlen length of the @a addr
1358 * @param numeric should (IP) addresses be displayed in numeric form?
1359 * @param timeout after how long should we give up?
1360 * @param asc function to call on each string
1361 * @param asc_cls closure for @a asc
1364 unix_plugin_address_pretty_printer (void *cls, const char *type,
1365 const void *addr, size_t addrlen,
1367 struct GNUNET_TIME_Relative timeout,
1368 GNUNET_TRANSPORT_AddressStringCallback asc,
1371 if ((NULL != addr) && (addrlen > 0))
1373 asc (asc_cls, unix_address_to_string (NULL, addr, addrlen));
1375 else if (0 == addrlen)
1377 asc (asc_cls, TRANSPORT_SESSION_INBOUND_STRING);
1382 asc (asc_cls, "<invalid UNIX address>");
1384 asc (asc_cls, NULL);
1389 * Function called to convert a string address to
1392 * @param cls closure ('struct Plugin*')
1393 * @param addr string address
1394 * @param addrlen length of the @a addr (strlen(addr) + '\0')
1395 * @param buf location to store the buffer
1396 * If the function returns #GNUNET_SYSERR, its contents are undefined.
1397 * @param added length of created address
1398 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
1401 unix_string_to_address (void *cls,
1402 const char *addr, uint16_t addrlen,
1403 void **buf, size_t *added)
1405 struct UnixAddress *ua;
1412 /* Format unix.options.address */
1417 if ((NULL == addr) || (addrlen == 0))
1420 return GNUNET_SYSERR;
1422 if ('\0' != addr[addrlen - 1])
1425 return GNUNET_SYSERR;
1427 if (strlen (addr) != addrlen - 1)
1430 return GNUNET_SYSERR;
1432 plugin = GNUNET_strdup (addr);
1433 optionstr = strchr (plugin, '.');
1434 if (NULL == optionstr)
1437 GNUNET_free (plugin);
1438 return GNUNET_SYSERR;
1440 optionstr[0] = '\0';
1442 options = atol (optionstr);
1443 address = strchr (optionstr, '.');
1444 if (NULL == address)
1447 GNUNET_free (plugin);
1448 return GNUNET_SYSERR;
1452 if (0 != strcmp(plugin, PLUGIN_NAME))
1455 GNUNET_free (plugin);
1456 return GNUNET_SYSERR;
1459 ua_size = sizeof (struct UnixAddress) + strlen (address) + 1;
1460 ua = GNUNET_malloc (ua_size);
1461 ua->options = htonl (options);
1462 ua->addrlen = htonl (strlen (address) + 1);
1463 memcpy (&ua[1], address, strlen (address) + 1);
1464 GNUNET_free (plugin);
1473 * Notify transport service about address
1475 * @param cls the plugin
1479 address_notification (void *cls,
1480 const struct GNUNET_SCHEDULER_TaskContext *tc)
1482 struct Plugin *plugin = cls;
1483 struct GNUNET_HELLO_Address *address;
1485 struct UnixAddress *ua;
1487 len = sizeof (struct UnixAddress) + strlen (plugin->unix_socket_path) + 1;
1488 ua = GNUNET_malloc (len);
1489 ua->options = htonl (myoptions);
1490 ua->addrlen = htonl(strlen (plugin->unix_socket_path) + 1);
1491 memcpy (&ua[1], plugin->unix_socket_path, strlen (plugin->unix_socket_path) + 1);
1493 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1494 address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
1495 PLUGIN_NAME, ua, len, GNUNET_HELLO_ADDRESS_INFO_NONE);
1497 plugin->env->notify_address (plugin->env->cls, GNUNET_YES, address);
1499 GNUNET_free (address);
1504 * Increment session timeout due to activity
1506 * @param res session for which the timeout should be moved
1509 reschedule_session_timeout (struct Session *s)
1511 GNUNET_assert (NULL != s);
1512 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s->timeout_task);
1513 GNUNET_SCHEDULER_cancel (s->timeout_task);
1514 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1517 LOG (GNUNET_ERROR_TYPE_DEBUG,
1518 "Timeout rescheduled for session %p set to %s\n",
1520 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1526 * Function called on sessions to disconnect
1528 * @param cls the plugin
1529 * @param key peer identity (unused)
1530 * @param value the 'struct Session' to disconnect
1531 * @return #GNUNET_YES (always, continue to iterate)
1534 get_session_delete_it (void *cls,
1535 const struct GNUNET_PeerIdentity *key,
1538 struct Plugin *plugin = cls;
1539 struct Session *s = value;
1541 unix_session_disconnect (plugin, s);
1547 * Disconnect from a remote node. Clean up session if we have one for this peer
1549 * @param cls closure for this call (should be handle to Plugin)
1550 * @param target the peeridentity of the peer to disconnect
1551 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the operation failed
1554 unix_peer_disconnect (void *cls,
1555 const struct GNUNET_PeerIdentity *target)
1557 struct Plugin *plugin = cls;
1559 GNUNET_assert (plugin != NULL);
1560 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->session_map,
1562 &get_session_delete_it, plugin);
1567 * The exported method. Initializes the plugin and returns a
1568 * struct with the callbacks.
1570 * @param cls the plugin's execution environment
1571 * @return NULL on error, plugin functions otherwise
1574 libgnunet_plugin_transport_unix_init (void *cls)
1576 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1577 unsigned long long port;
1578 struct GNUNET_TRANSPORT_PluginFunctions *api;
1579 struct Plugin *plugin;
1580 int sockets_created;
1582 if (NULL == env->receive)
1584 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
1585 initialze the plugin or the API */
1586 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
1588 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1589 api->address_to_string = &unix_address_to_string;
1590 api->string_to_address = &unix_string_to_address;
1594 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-unix", "PORT",
1596 port = UNIX_NAT_DEFAULT_PORT;
1597 plugin = GNUNET_new (struct Plugin);
1598 plugin->port = port;
1600 GNUNET_asprintf (&plugin->unix_socket_path,
1601 "/tmp/unix-plugin-sock.%d",
1604 /* Initialize my flags */
1607 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
1610 api->get_session = &unix_plugin_get_session;
1611 api->send = &unix_plugin_send;
1612 api->disconnect_peer = &unix_peer_disconnect;
1613 api->disconnect_session = &unix_session_disconnect;
1614 api->query_keepalive_factor = &unix_query_keepalive_factor;
1615 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1616 api->address_to_string = &unix_address_to_string;
1617 api->check_address = &unix_check_address;
1618 api->string_to_address = &unix_string_to_address;
1619 api->get_network = &unix_get_network;
1620 api->update_session_timeout = &unix_plugin_update_session_timeout;
1621 sockets_created = unix_transport_server_start (plugin);
1622 if (0 == sockets_created)
1623 LOG (GNUNET_ERROR_TYPE_WARNING,
1624 _("Failed to open UNIX listen socket\n"));
1625 plugin->session_map = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
1626 plugin->address_update_task = GNUNET_SCHEDULER_add_now (&address_notification, plugin);
1632 * Shutdown the plugin.
1634 * @param cls the plugin API returned from the initialization function
1635 * @return NULL (always)
1638 libgnunet_plugin_transport_unix_done (void *cls)
1640 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1641 struct Plugin *plugin = api->cls;
1642 struct GNUNET_HELLO_Address *address;
1643 struct UNIXMessageWrapper * msgw;
1644 struct UnixAddress *ua;
1653 len = sizeof (struct UnixAddress) + strlen (plugin->unix_socket_path) + 1;
1654 ua = GNUNET_malloc (len);
1655 ua->options = htonl (myoptions);
1656 ua->addrlen = htonl(strlen (plugin->unix_socket_path) + 1);
1657 memcpy (&ua[1], plugin->unix_socket_path, strlen (plugin->unix_socket_path) + 1);
1658 address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
1659 PLUGIN_NAME, ua, len, GNUNET_HELLO_ADDRESS_INFO_NONE);
1660 plugin->env->notify_address (plugin->env->cls, GNUNET_NO, address);
1662 GNUNET_free (address);
1665 while (NULL != (msgw = plugin->msg_head))
1667 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
1668 if (msgw->cont != NULL)
1669 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR,
1671 GNUNET_free (msgw->msg);
1675 if (GNUNET_SCHEDULER_NO_TASK != plugin->select_task)
1677 GNUNET_SCHEDULER_cancel (plugin->select_task);
1678 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1680 if (GNUNET_SCHEDULER_NO_TASK != plugin->address_update_task)
1682 GNUNET_SCHEDULER_cancel (plugin->address_update_task);
1683 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1685 if (NULL != plugin->unix_sock.desc)
1687 GNUNET_break (GNUNET_OK ==
1688 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc));
1689 plugin->unix_sock.desc = NULL;
1690 plugin->with_ws = GNUNET_NO;
1692 GNUNET_CONTAINER_multipeermap_iterate (plugin->session_map,
1693 &get_session_delete_it, plugin);
1694 GNUNET_CONTAINER_multipeermap_destroy (plugin->session_map);
1695 if (NULL != plugin->rs)
1696 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1697 if (NULL != plugin->ws)
1698 GNUNET_NETWORK_fdset_destroy (plugin->ws);
1699 GNUNET_free (plugin->unix_socket_path);
1700 GNUNET_free (plugin);
1705 /* end of plugin_transport_unix.c */