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 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_MultiPeerMap *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);
365 static struct sockaddr_un *
366 unix_address_to_sockaddr (const char *unixpath , socklen_t *sock_len)
368 struct sockaddr_un *un;
371 GNUNET_assert (0 < strlen (unixpath)); /* sanity check */
372 un = GNUNET_new (struct sockaddr_un);
373 un->sun_family = AF_UNIX;
374 slen = strlen (unixpath);
375 if (slen >= sizeof (un->sun_path))
376 slen = sizeof (un->sun_path) - 1;
377 memcpy (un->sun_path, unixpath, slen);
378 un->sun_path[slen] = '\0';
379 slen = sizeof (struct sockaddr_un);
380 #if HAVE_SOCKADDR_IN_SIN_LEN
381 un->sun_len = (u_char) slen;
384 un->sun_path[0] = '\0';
392 * Re-schedule the main 'select' callback (unix_plugin_select)
395 * @param plugin the plugin context
398 reschedule_select (struct Plugin * plugin)
400 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
402 GNUNET_SCHEDULER_cancel (plugin->select_task);
403 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
405 if (NULL != plugin->msg_head)
407 plugin->select_task =
408 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
409 GNUNET_TIME_UNIT_FOREVER_REL,
412 &unix_plugin_select, plugin);
413 plugin->with_ws = GNUNET_YES;
417 plugin->select_task =
418 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
419 GNUNET_TIME_UNIT_FOREVER_REL,
422 &unix_plugin_select, plugin);
423 plugin->with_ws = GNUNET_NO;
429 * Closure to 'lookup_session_it'.
434 * Location to store the session, if found.
439 * Address we are looking for.
441 const struct UnixAddress *ua;
448 * Function called to find a session by address.
450 * @param cls the 'struct LookupCtx'
451 * @param key peer we are looking for (unused)
452 * @param value a session
453 * @return GNUNET_YES if not found (continue looking), GNUNET_NO on success
456 lookup_session_it (void *cls,
457 const struct GNUNET_PeerIdentity * key,
460 struct LookupCtx *lctx = cls;
461 struct Session *t = value;
463 if (t->addrlen != lctx->ua_len)
469 if (0 == memcmp (t->addr, lctx->ua, lctx->ua_len))
480 * Find an existing session by address.
482 * @param plugin the plugin
483 * @param sender for which peer should the session be?
484 * @param ua address to look for
485 * @param ua_len length of the address
486 * @return NULL if session was not found
488 static struct Session *
489 lookup_session (struct Plugin *plugin,
490 const struct GNUNET_PeerIdentity *sender,
491 const struct UnixAddress *ua, size_t ua_len)
493 struct LookupCtx lctx;
495 GNUNET_assert (NULL != plugin);
496 GNUNET_assert (NULL != sender);
497 GNUNET_assert (NULL != ua);
500 lctx.ua_len = ua_len;
501 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->session_map,
503 &lookup_session_it, &lctx);
509 * Functions with this signature are called whenever we need
510 * to close a session due to a disconnect or failure to
511 * establish a connection.
513 * @param s session to close down
516 disconnect_session (struct Session *s)
518 struct Plugin *plugin = s->plugin;
519 struct UNIXMessageWrapper *msgw;
520 struct UNIXMessageWrapper *next;
523 LOG (GNUNET_ERROR_TYPE_DEBUG,
524 "Disconnecting session for peer `%s' `%s'\n",
525 GNUNET_i2s (&s->target),
527 plugin->env->session_end (plugin->env->cls, &s->target, s);
529 next = plugin->msg_head;
534 if (msgw->session != s)
536 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
537 if (NULL != msgw->cont)
538 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR,
540 GNUNET_free (msgw->msg);
542 removed = GNUNET_YES;
544 GNUNET_assert (GNUNET_YES ==
545 GNUNET_CONTAINER_multipeermap_remove (plugin->session_map,
548 GNUNET_STATISTICS_set (plugin->env->stats,
549 "# UNIX sessions active",
550 GNUNET_CONTAINER_multipeermap_size (plugin->session_map),
552 if ((GNUNET_YES == removed) && (NULL == plugin->msg_head))
553 reschedule_select (plugin);
554 if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task)
556 GNUNET_SCHEDULER_cancel (s->timeout_task);
557 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
564 * Actually send out the message, assume we've got the address and
565 * send_handle squared away!
568 * @param send_handle which handle to send message on
569 * @param target who should receive this message (ignored by UNIX)
570 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
571 * @param msgbuf_size the size of the msgbuf to send
572 * @param priority how important is the message (ignored by UNIX)
573 * @param timeout when should we time out (give up) if we can not transmit?
574 * @param addr the addr to send the message to, needs to be a sockaddr for us
575 * @param addrlen the len of addr
576 * @param payload bytes payload to send
577 * @param cont continuation to call once the message has
578 * been transmitted (or if the transport is ready
579 * for the next transmission call; or if the
580 * peer disconnected...)
581 * @param cont_cls closure for cont
582 * @return on success the number of bytes written, RETRY for retry, -1 on errors
585 unix_real_send (void *cls,
586 struct GNUNET_NETWORK_Handle *send_handle,
587 const struct GNUNET_PeerIdentity *target, const char *msgbuf,
588 size_t msgbuf_size, unsigned int priority,
589 struct GNUNET_TIME_Absolute timeout,
590 const struct UnixAddress *addr,
593 GNUNET_TRANSPORT_TransmitContinuation cont,
596 struct Plugin *plugin = cls;
598 struct sockaddr_un *un;
600 const char *unixpath;
603 GNUNET_assert (NULL != plugin);
604 if (NULL == send_handle)
606 GNUNET_break (0); /* We do not have a send handle */
607 return GNUNET_SYSERR;
609 if ((NULL == addr) || (0 == addrlen))
611 GNUNET_break (0); /* Can never send if we don't have an address */
612 return GNUNET_SYSERR;
615 /* Prepare address */
616 unixpath = (const char *) &addr[1];
617 if (NULL == (un = unix_address_to_sockaddr (unixpath, &un_len)))
625 sent = GNUNET_NETWORK_socket_sendto (send_handle, msgbuf, msgbuf_size,
626 (const struct sockaddr *) un, un_len);
627 if (GNUNET_SYSERR == sent)
629 if ( (EAGAIN == errno) ||
633 return RETRY; /* We have to retry later */
635 if (EMSGSIZE == errno)
638 socklen_t len = sizeof (size);
640 GNUNET_NETWORK_socket_getsockopt ((struct GNUNET_NETWORK_Handle *)
641 send_handle, SOL_SOCKET, SO_SNDBUF, &size,
643 if (size < msgbuf_size)
645 LOG (GNUNET_ERROR_TYPE_DEBUG,
646 "Trying to increase socket buffer size from %i to %i for message size %i\n",
647 size, ((msgbuf_size / 1000) + 2) * 1000, msgbuf_size);
648 size = ((msgbuf_size / 1000) + 2) * 1000;
649 if (GNUNET_OK == GNUNET_NETWORK_socket_setsockopt
650 ((struct GNUNET_NETWORK_Handle *) send_handle, SOL_SOCKET, SO_SNDBUF,
651 &size, sizeof (size)))
652 goto resend; /* Increased buffer size, retry sending */
655 /* Could not increase buffer size: error, no retry */
656 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "setsockopt");
658 return GNUNET_SYSERR;
663 /* Buffer is bigger than message: error, no retry
664 * This should never happen!*/
667 return GNUNET_SYSERR;
672 LOG (GNUNET_ERROR_TYPE_DEBUG,
673 "UNIX transmit %u-byte message to %s (%d: %s)\n",
674 (unsigned int) msgbuf_size,
675 GNUNET_a2s ((const struct sockaddr *)un, un_len),
677 (sent < 0) ? STRERROR (errno) : "ok");
684 * Closure for 'get_session_it'.
686 struct GetSessionIteratorContext
689 * Location to store the session, if found.
694 * Address information.
699 * Number of bytes in 'address'
706 * Function called to find a session by address.
708 * @param cls the 'struct LookupCtx'
709 * @param key peer we are looking for (unused)
710 * @param value a session
711 * @return GNUNET_YES if not found (continue looking), GNUNET_NO on success
714 get_session_it (void *cls,
715 const struct GNUNET_PeerIdentity *key,
718 struct GetSessionIteratorContext *gsi = cls;
719 struct Session *s = value;
721 if ((GNUNET_NO == s->inbound) && (gsi->addrlen == s->addrlen) &&
722 (0 == memcmp (gsi->address, s->addr, s->addrlen)) )
732 * Session was idle for too long, so disconnect it
734 * @param cls the 'struct Session' to disconnect
735 * @param tc scheduler context
738 session_timeout (void *cls,
739 const struct GNUNET_SCHEDULER_TaskContext *tc)
741 struct Session *s = cls;
743 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
744 LOG (GNUNET_ERROR_TYPE_DEBUG,
745 "Session %p was idle for %s, disconnecting\n",
747 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
749 disconnect_session (s);
754 * Function obtain the network type for a session
756 * @param cls closure ('struct Plugin*')
757 * @param session the session
758 * @return the network type in HBO or GNUNET_SYSERR
760 static enum GNUNET_ATS_Network_Type
761 unix_get_network (void *cls,
762 struct Session *session)
764 GNUNET_assert (NULL != session);
765 return GNUNET_ATS_NET_LOOPBACK;
770 * Creates a new outbound session the transport service will use to send data to the
773 * @param cls the plugin
774 * @param address the address
775 * @return the session or NULL of max connections exceeded
777 static struct Session *
778 unix_plugin_get_session (void *cls,
779 const struct GNUNET_HELLO_Address *address)
781 struct Plugin *plugin = cls;
783 struct GetSessionIteratorContext gsi;
784 struct UnixAddress *ua;
786 uint32_t addr_str_len;
788 GNUNET_assert (NULL != plugin);
789 GNUNET_assert (NULL != address);
791 ua = (struct UnixAddress *) address->address;
792 if ((NULL == address->address) || (0 == address->address_length) ||
793 (sizeof (struct UnixAddress) > address->address_length))
798 addrstr = (char *) &ua[1];
799 addr_str_len = ntohl (ua->addrlen);
800 if (addr_str_len != address->address_length - sizeof (struct UnixAddress))
802 /* This can be a legacy address */
806 if ('\0' != addrstr[addr_str_len - 1])
811 if (strlen (addrstr) + 1 != addr_str_len)
817 /* Check if already existing */
818 gsi.address = (const char *) address->address;
819 gsi.addrlen = address->address_length;
821 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->session_map,
823 &get_session_it, &gsi);
826 LOG (GNUNET_ERROR_TYPE_DEBUG,
827 "Found existing session\n");
831 /* create a new session */
832 s = GNUNET_malloc (sizeof (struct Session) + address->address_length);
833 s->addr = (struct UnixAddress *) &s[1];
834 s->addrlen = address->address_length;
836 s->inbound = GNUNET_NO;
837 memcpy (s->addr, address->address, address->address_length);
838 memcpy (&s->target, &address->peer, sizeof (struct GNUNET_PeerIdentity));
839 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s->timeout_task);
840 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
843 LOG (GNUNET_ERROR_TYPE_DEBUG,
844 "Creating a new session %p for address `%s'\n",
845 s, unix_address_to_string (NULL, address->address, address->address_length));
846 (void) GNUNET_CONTAINER_multipeermap_put (plugin->session_map,
848 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
849 GNUNET_STATISTICS_set (plugin->env->stats,
850 "# UNIX sessions active",
851 GNUNET_CONTAINER_multipeermap_size (plugin->session_map),
858 * Function that can be used by the transport service to transmit
859 * a message using the plugin. Note that in the case of a
860 * peer disconnecting, the continuation MUST be called
861 * prior to the disconnect notification itself. This function
862 * will be called with this peer's HELLO message to initiate
863 * a fresh connection to another peer.
866 * @param session which session must be used
867 * @param msgbuf the message to transmit
868 * @param msgbuf_size number of bytes in 'msgbuf'
869 * @param priority how important is the message (most plugins will
870 * ignore message priority and just FIFO)
871 * @param to how long to wait at most for the transmission (does not
872 * require plugins to discard the message after the timeout,
873 * just advisory for the desired delay; most plugins will ignore
875 * @param cont continuation to call once the message has
876 * been transmitted (or if the transport is ready
877 * for the next transmission call; or if the
878 * peer disconnected...); can be NULL
879 * @param cont_cls closure for cont
880 * @return number of bytes used (on the physical network, with overheads);
881 * -1 on hard errors (i.e. address invalid); 0 is a legal value
882 * and does NOT mean that the message was not transmitted (DV)
885 unix_plugin_send (void *cls,
886 struct Session *session,
887 const char *msgbuf, size_t msgbuf_size,
888 unsigned int priority,
889 struct GNUNET_TIME_Relative to,
890 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
892 struct Plugin *plugin = cls;
893 struct UNIXMessageWrapper *wrapper;
894 struct UNIXMessage *message;
897 GNUNET_assert (NULL != plugin);
898 GNUNET_assert (NULL != session);
901 GNUNET_CONTAINER_multipeermap_contains_value (plugin->session_map,
905 LOG (GNUNET_ERROR_TYPE_ERROR,
906 "Invalid session for peer `%s' `%s'\n",
907 GNUNET_i2s (&session->target),
908 (const char *) session->addr);
910 return GNUNET_SYSERR;
912 LOG (GNUNET_ERROR_TYPE_DEBUG,
913 "Sending %u bytes with session for peer `%s' `%s'\n",
915 GNUNET_i2s (&session->target),
916 (const char *) session->addr);
917 ssize = sizeof (struct UNIXMessage) + msgbuf_size;
918 message = GNUNET_malloc (sizeof (struct UNIXMessage) + msgbuf_size);
919 message->header.size = htons (ssize);
920 message->header.type = htons (0);
921 memcpy (&message->sender, plugin->env->my_identity,
922 sizeof (struct GNUNET_PeerIdentity));
923 memcpy (&message[1], msgbuf, msgbuf_size);
924 reschedule_session_timeout (session);
925 wrapper = GNUNET_malloc (sizeof (struct UNIXMessageWrapper));
926 wrapper->msg = message;
927 wrapper->msgsize = ssize;
928 wrapper->payload = msgbuf_size;
929 wrapper->priority = priority;
930 wrapper->timeout = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(), to);
931 wrapper->cont = cont;
932 wrapper->cont_cls = cont_cls;
933 wrapper->session = session;
934 GNUNET_CONTAINER_DLL_insert (plugin->msg_head,
937 plugin->bytes_in_queue += ssize;
938 GNUNET_STATISTICS_set (plugin->env->stats,
939 "# bytes currently in UNIX buffers",
940 plugin->bytes_in_queue,
942 if (GNUNET_NO == plugin->with_ws)
943 reschedule_select (plugin);
949 * Demultiplexer for UNIX messages
951 * @param plugin the main plugin for this transport
952 * @param sender from which peer the message was received
953 * @param currhdr pointer to the header of the message
954 * @param ua address to look for
955 * @param ua_len length of the address
958 unix_demultiplexer (struct Plugin *plugin, struct GNUNET_PeerIdentity *sender,
959 const struct GNUNET_MessageHeader *currhdr,
960 const struct UnixAddress *ua, size_t ua_len)
962 struct Session *s = NULL;
963 struct GNUNET_HELLO_Address * addr;
965 GNUNET_break (ntohl(plugin->ats_network.value) != GNUNET_ATS_NET_UNSPECIFIED);
967 GNUNET_assert (ua_len >= sizeof (struct UnixAddress));
969 LOG (GNUNET_ERROR_TYPE_DEBUG,
970 "Received message from %s\n",
971 unix_address_to_string(NULL, ua, ua_len));
972 GNUNET_STATISTICS_update (plugin->env->stats,
973 "# bytes received via UNIX",
974 ntohs (currhdr->size),
977 addr = GNUNET_HELLO_address_allocate (sender,
981 s = lookup_session (plugin, sender, ua, ua_len);
984 s = unix_plugin_get_session (plugin, addr);
985 s->inbound = GNUNET_YES;
986 /* Notify transport and ATS about new inbound session */
987 plugin->env->session_start (NULL, sender,
988 PLUGIN_NAME, NULL, 0, s, &plugin->ats_network, 1);
990 reschedule_session_timeout (s);
992 plugin->env->receive (plugin->env->cls, sender, currhdr, s,
993 (GNUNET_YES == s->inbound) ? NULL : (const char *) ua,
994 (GNUNET_YES == s->inbound) ? 0 : ua_len);
996 plugin->env->update_address_metrics (plugin->env->cls, sender,
997 (GNUNET_YES == s->inbound) ? NULL : (const char *) ua,
998 (GNUNET_YES == s->inbound) ? 0 : ua_len,
999 s, &plugin->ats_network, 1);
1006 * Read from UNIX domain socket (it is ready).
1008 * @param plugin the plugin
1011 unix_plugin_select_read (struct Plugin *plugin)
1013 char buf[65536] GNUNET_ALIGN;
1014 struct UnixAddress *ua;
1015 struct UNIXMessage *msg;
1016 struct GNUNET_PeerIdentity sender;
1017 struct sockaddr_un un;
1023 const struct GNUNET_MessageHeader *currhdr;
1027 addrlen = sizeof (un);
1028 memset (&un, 0, sizeof (un));
1031 GNUNET_NETWORK_socket_recvfrom (plugin->unix_sock.desc, buf, sizeof (buf),
1032 (struct sockaddr *) &un, &addrlen);
1034 if ((GNUNET_SYSERR == ret) && ((errno == EAGAIN) || (errno == ENOBUFS)))
1037 if (ret == GNUNET_SYSERR)
1039 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "recvfrom");
1045 un.sun_path[0] = '/';
1047 LOG (GNUNET_ERROR_TYPE_DEBUG, "Read %d bytes from socket %s\n", ret,
1051 GNUNET_assert (AF_UNIX == (un.sun_family));
1052 ua_len = sizeof (struct UnixAddress) + strlen (&un.sun_path[0]) +1;
1053 ua = GNUNET_malloc (ua_len);
1054 ua->addrlen = htonl (strlen (&un.sun_path[0]) +1);
1055 ua->options = htonl (0);
1056 memcpy (&ua[1], &un.sun_path[0], strlen (&un.sun_path[0]) +1);
1058 msg = (struct UNIXMessage *) buf;
1059 csize = ntohs (msg->header.size);
1060 if ((csize < sizeof (struct UNIXMessage)) || (csize > ret))
1062 GNUNET_break_op (0);
1066 msgbuf = (char *) &msg[1];
1067 memcpy (&sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
1069 tsize = csize - sizeof (struct UNIXMessage);
1070 while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
1072 currhdr = (struct GNUNET_MessageHeader *) &msgbuf[offset];
1073 csize = ntohs (currhdr->size);
1074 if ((csize < sizeof (struct GNUNET_MessageHeader)) ||
1075 (csize > tsize - offset))
1077 GNUNET_break_op (0);
1080 unix_demultiplexer (plugin, &sender, currhdr, ua, ua_len);
1088 * Write to UNIX domain socket (it is ready).
1090 * @param plugin the plugin
1093 unix_plugin_select_write (struct Plugin *plugin)
1096 struct UNIXMessageWrapper * msgw;
1098 while (NULL != (msgw = plugin->msg_tail))
1100 if (GNUNET_TIME_absolute_get_remaining (msgw->timeout).rel_value_us > 0)
1101 break; /* Message is ready for sending */
1102 /* Message has a timeout */
1103 LOG (GNUNET_ERROR_TYPE_DEBUG,
1104 "Timeout for message with %u bytes \n",
1105 (unsigned int) msgw->msgsize);
1106 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
1107 plugin->bytes_in_queue -= msgw->msgsize;
1108 GNUNET_STATISTICS_set (plugin->env->stats,
1109 "# bytes currently in UNIX buffers",
1110 plugin->bytes_in_queue, GNUNET_NO);
1111 GNUNET_STATISTICS_update (plugin->env->stats,
1112 "# UNIX bytes discarded",
1115 if (NULL != msgw->cont)
1116 msgw->cont (msgw->cont_cls,
1117 &msgw->session->target,
1121 GNUNET_free (msgw->msg);
1125 return; /* Nothing to send at the moment */
1127 sent = unix_real_send (plugin,
1128 plugin->unix_sock.desc,
1129 &msgw->session->target,
1130 (const char *) msgw->msg,
1134 msgw->session->addr,
1135 msgw->session->addrlen,
1137 msgw->cont, msgw->cont_cls);
1141 GNUNET_STATISTICS_update (plugin->env->stats,
1142 "# UNIX retry attempts",
1146 if (GNUNET_SYSERR == sent)
1148 /* failed and no retry */
1149 if (NULL != msgw->cont)
1150 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR, msgw->payload, 0);
1152 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, msgw);
1154 GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
1155 plugin->bytes_in_queue -= msgw->msgsize;
1156 GNUNET_STATISTICS_set (plugin->env->stats,
1157 "# bytes currently in UNIX buffers",
1158 plugin->bytes_in_queue, GNUNET_NO);
1159 GNUNET_STATISTICS_update (plugin->env->stats,
1160 "# UNIX bytes discarded",
1164 GNUNET_free (msgw->msg);
1168 /* successfully sent bytes */
1169 GNUNET_break (sent > 0);
1170 GNUNET_CONTAINER_DLL_remove (plugin->msg_head,
1173 GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
1174 plugin->bytes_in_queue -= msgw->msgsize;
1175 GNUNET_STATISTICS_set (plugin->env->stats,
1176 "# bytes currently in UNIX buffers",
1177 plugin->bytes_in_queue,
1179 GNUNET_STATISTICS_update (plugin->env->stats,
1180 "# bytes transmitted via UNIX",
1183 if (NULL != msgw->cont)
1184 msgw->cont (msgw->cont_cls, &msgw->session->target,
1188 GNUNET_free (msgw->msg);
1194 * We have been notified that our writeset has something to read. We don't
1195 * know which socket needs to be read, so we have to check each one
1196 * Then reschedule this function to be called again once more is available.
1198 * @param cls the plugin handle
1199 * @param tc the scheduling context (for rescheduling this function again)
1202 unix_plugin_select (void *cls,
1203 const struct GNUNET_SCHEDULER_TaskContext *tc)
1205 struct Plugin *plugin = cls;
1207 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1208 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1211 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1213 /* Ready to send data */
1214 GNUNET_assert (GNUNET_NETWORK_fdset_isset
1215 (tc->write_ready, plugin->unix_sock.desc));
1216 if (NULL != plugin->msg_head)
1217 unix_plugin_select_write (plugin);
1220 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1222 /* Ready to receive data */
1223 GNUNET_assert (GNUNET_NETWORK_fdset_isset
1224 (tc->read_ready, plugin->unix_sock.desc));
1225 unix_plugin_select_read (plugin);
1227 reschedule_select (plugin);
1232 * Create a slew of UNIX sockets. If possible, use IPv6 and IPv4.
1234 * @param cls closure for server start, should be a struct Plugin *
1235 * @return number of sockets created or GNUNET_SYSERR on error
1238 unix_transport_server_start (void *cls)
1240 struct Plugin *plugin = cls;
1241 struct sockaddr_un *un;
1244 un = unix_address_to_sockaddr (plugin->unix_socket_path, &un_len);
1245 plugin->ats_network = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) un, un_len);
1246 plugin->unix_sock.desc =
1247 GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_DGRAM, 0);
1248 if (NULL == plugin->unix_sock.desc)
1250 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
1251 return GNUNET_SYSERR;
1253 if (GNUNET_NETWORK_socket_bind (plugin->unix_sock.desc, (const struct sockaddr *) un, un_len, 0)
1256 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
1257 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc);
1258 plugin->unix_sock.desc = NULL;
1260 return GNUNET_SYSERR;
1262 LOG (GNUNET_ERROR_TYPE_DEBUG, "Bound to `%s'\n", plugin->unix_socket_path);
1263 plugin->rs = GNUNET_NETWORK_fdset_create ();
1264 plugin->ws = GNUNET_NETWORK_fdset_create ();
1265 GNUNET_NETWORK_fdset_zero (plugin->rs);
1266 GNUNET_NETWORK_fdset_zero (plugin->ws);
1267 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->unix_sock.desc);
1268 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->unix_sock.desc);
1270 reschedule_select (plugin);
1277 * Function called for a quick conversion of the binary address to
1278 * a numeric address. Note that the caller must not free the
1279 * address and that the next call to this function is allowed
1280 * to override the address again.
1282 * @param cls closure
1283 * @param addr binary address
1284 * @param addrlen length of the address
1285 * @return string representing the same address
1288 unix_address_to_string (void *cls, const void *addr, size_t addrlen)
1290 static char rbuf[1024];
1291 struct UnixAddress *ua = (struct UnixAddress *) addr;
1293 size_t addr_str_len;
1297 GNUNET_snprintf(rbuf, sizeof (rbuf), "%s", TRANSPORT_SESSION_INBOUND_STRING);
1299 if ((NULL == addr) || (sizeof (struct UnixAddress) > addrlen))
1304 addrstr = (char *) &ua[1];
1305 addr_str_len = ntohl (ua->addrlen);
1307 if (addr_str_len != addrlen - sizeof (struct UnixAddress))
1313 if ('\0' != addrstr[addr_str_len - 1])
1318 if (strlen (addrstr) + 1 != addr_str_len)
1324 GNUNET_snprintf(rbuf, sizeof (rbuf), "%s.%u.%s", PLUGIN_NAME, ntohl (ua->options), addrstr);
1329 * Function that will be called to check if a binary address for this
1330 * plugin is well-formed and corresponds to an address for THIS peer
1331 * (as per our configuration). Naturally, if absolutely necessary,
1332 * plugins can be a bit conservative in their answer, but in general
1333 * plugins should make sure that the address does not redirect
1334 * traffic to a 3rd party that might try to man-in-the-middle our
1337 * @param cls closure, should be our handle to the Plugin
1338 * @param addr pointer to the address
1339 * @param addrlen length of addr
1340 * @return GNUNET_OK if this is a plausible address for this peer
1341 * and transport, GNUNET_SYSERR if not
1345 unix_check_address (void *cls, const void *addr, size_t addrlen)
1347 struct Plugin* plugin = cls;
1348 struct UnixAddress *ua = (struct UnixAddress *) addr;
1350 size_t addr_str_len;
1352 if ((NULL == addr) || (0 == addrlen) || (sizeof (struct UnixAddress) > addrlen))
1355 return GNUNET_SYSERR;
1357 addrstr = (char *) &ua[1];
1358 addr_str_len = ntohl (ua->addrlen);
1359 if ('\0' != addrstr[addr_str_len - 1])
1362 return GNUNET_SYSERR;
1364 if (strlen (addrstr) + 1 != addr_str_len)
1367 return GNUNET_SYSERR;
1370 if (0 == strcmp (plugin->unix_socket_path, addrstr))
1372 return GNUNET_SYSERR;
1377 * Convert the transports address to a nice, human-readable
1380 * @param cls closure
1381 * @param type name of the transport that generated the address
1382 * @param addr one of the addresses of the host, NULL for the last address
1383 * the specific address format depends on the transport
1384 * @param addrlen length of the address
1385 * @param numeric should (IP) addresses be displayed in numeric form?
1386 * @param timeout after how long should we give up?
1387 * @param asc function to call on each string
1388 * @param asc_cls closure for asc
1391 unix_plugin_address_pretty_printer (void *cls, const char *type,
1392 const void *addr, size_t addrlen,
1394 struct GNUNET_TIME_Relative timeout,
1395 GNUNET_TRANSPORT_AddressStringCallback asc,
1398 if ((NULL != addr) && (addrlen > 0))
1400 asc (asc_cls, unix_address_to_string (NULL, addr, addrlen));
1402 else if (0 == addrlen)
1404 asc (asc_cls, TRANSPORT_SESSION_INBOUND_STRING);
1409 asc (asc_cls, "<invalid UNIX address>");
1411 asc (asc_cls, NULL);
1416 * Function called to convert a string address to
1419 * @param cls closure ('struct Plugin*')
1420 * @param addr string address
1421 * @param addrlen length of the address (strlen(addr) + '\0')
1422 * @param buf location to store the buffer
1423 * If the function returns GNUNET_SYSERR, its contents are undefined.
1424 * @param added length of created address
1425 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
1428 unix_string_to_address (void *cls, const char *addr, uint16_t addrlen,
1429 void **buf, size_t *added)
1431 struct UnixAddress *ua;
1438 /* Format unix.options.address */
1443 if ((NULL == addr) || (addrlen == 0))
1446 return GNUNET_SYSERR;
1448 if ('\0' != addr[addrlen - 1])
1451 return GNUNET_SYSERR;
1453 if (strlen (addr) != addrlen - 1)
1456 return GNUNET_SYSERR;
1458 plugin = GNUNET_strdup (addr);
1459 optionstr = strchr (plugin, '.');
1460 if (NULL == optionstr)
1463 GNUNET_free (plugin);
1464 return GNUNET_SYSERR;
1466 optionstr[0] = '\0';
1468 options = atol (optionstr);
1469 address = strchr (optionstr, '.');
1470 if (NULL == address)
1473 GNUNET_free (plugin);
1474 return GNUNET_SYSERR;
1478 if (0 != strcmp(plugin, PLUGIN_NAME))
1481 GNUNET_free (plugin);
1482 return GNUNET_SYSERR;
1485 ua_size = sizeof (struct UnixAddress) + strlen (address) + 1;
1486 ua = GNUNET_malloc (ua_size);
1487 ua->options = htonl (options);
1488 ua->addrlen = htonl (strlen (address) + 1);
1489 memcpy (&ua[1], address, strlen (address) + 1);
1490 GNUNET_free (plugin);
1499 * Notify transport service about address
1501 * @param cls the plugin
1505 address_notification (void *cls,
1506 const struct GNUNET_SCHEDULER_TaskContext *tc)
1508 struct Plugin *plugin = cls;
1510 struct UnixAddress *ua;
1512 len = sizeof (struct UnixAddress) + strlen (plugin->unix_socket_path) + 1;
1513 ua = GNUNET_malloc (len);
1514 ua->options = htonl (myoptions);
1515 ua->addrlen = htonl(strlen (plugin->unix_socket_path) + 1);
1516 memcpy (&ua[1], plugin->unix_socket_path, strlen (plugin->unix_socket_path) + 1);
1518 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1519 plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
1526 * Increment session timeout due to activity
1528 * @param s session for which the timeout should be moved
1531 reschedule_session_timeout (struct Session *s)
1533 GNUNET_assert (NULL != s);
1534 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s->timeout_task);
1535 GNUNET_SCHEDULER_cancel (s->timeout_task);
1536 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1539 LOG (GNUNET_ERROR_TYPE_DEBUG,
1540 "Timeout rescheduled for session %p set to %s\n",
1542 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1548 * Function called on sessions to disconnect
1550 * @param cls the plugin (unused)
1551 * @param key peer identity (unused)
1552 * @param value the 'struct Session' to disconnect
1553 * @return GNUNET_YES (always, continue to iterate)
1556 get_session_delete_it (void *cls,
1557 const struct GNUNET_PeerIdentity *key,
1560 struct Session *s = value;
1562 disconnect_session (s);
1568 * Disconnect from a remote node. Clean up session if we have one for this peer
1570 * @param cls closure for this call (should be handle to Plugin)
1571 * @param target the peeridentity of the peer to disconnect
1572 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the operation failed
1575 unix_disconnect (void *cls,
1576 const struct GNUNET_PeerIdentity *target)
1578 struct Plugin *plugin = cls;
1580 GNUNET_assert (plugin != NULL);
1581 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->session_map,
1583 &get_session_delete_it, plugin);
1588 * The exported method. Initializes the plugin and returns a
1589 * struct with the callbacks.
1591 * @param cls the plugin's execution environment
1592 * @return NULL on error, plugin functions otherwise
1595 libgnunet_plugin_transport_unix_init (void *cls)
1597 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1598 unsigned long long port;
1599 struct GNUNET_TRANSPORT_PluginFunctions *api;
1600 struct Plugin *plugin;
1601 int sockets_created;
1603 if (NULL == env->receive)
1605 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
1606 initialze the plugin or the API */
1607 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1609 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1610 api->address_to_string = &unix_address_to_string;
1611 api->string_to_address = &unix_string_to_address;
1615 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-unix", "PORT",
1617 port = UNIX_NAT_DEFAULT_PORT;
1618 plugin = GNUNET_malloc (sizeof (struct Plugin));
1619 plugin->port = port;
1621 GNUNET_asprintf (&plugin->unix_socket_path,
1622 "/tmp/unix-plugin-sock.%d",
1625 /* Initialize my flags */
1628 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1631 api->get_session = &unix_plugin_get_session;
1632 api->send = &unix_plugin_send;
1633 api->disconnect = &unix_disconnect;
1634 api->address_pretty_printer = &unix_plugin_address_pretty_printer;
1635 api->address_to_string = &unix_address_to_string;
1636 api->check_address = &unix_check_address;
1637 api->string_to_address = &unix_string_to_address;
1638 api->get_network = &unix_get_network;
1639 sockets_created = unix_transport_server_start (plugin);
1640 if (0 == sockets_created)
1641 LOG (GNUNET_ERROR_TYPE_WARNING,
1642 _("Failed to open UNIX listen socket\n"));
1643 plugin->session_map = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
1644 plugin->address_update_task = GNUNET_SCHEDULER_add_now (&address_notification, plugin);
1650 * Shutdown the plugin.
1652 * @param cls the plugin API returned from the initialization function
1653 * @return NULL (always)
1656 libgnunet_plugin_transport_unix_done (void *cls)
1658 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1659 struct Plugin *plugin = api->cls;
1660 struct UNIXMessageWrapper * msgw;
1661 struct UnixAddress *ua;
1670 len = sizeof (struct UnixAddress) + strlen (plugin->unix_socket_path) + 1;
1671 ua = GNUNET_malloc (len);
1672 ua->options = htonl (myoptions);
1673 ua->addrlen = htonl(strlen (plugin->unix_socket_path) + 1);
1674 memcpy (&ua[1], plugin->unix_socket_path, strlen (plugin->unix_socket_path) + 1);
1676 plugin->env->notify_address (plugin->env->cls, GNUNET_NO,
1679 while (NULL != (msgw = plugin->msg_head))
1681 GNUNET_CONTAINER_DLL_remove (plugin->msg_head, plugin->msg_tail, msgw);
1682 if (msgw->cont != NULL)
1683 msgw->cont (msgw->cont_cls, &msgw->session->target, GNUNET_SYSERR,
1685 GNUNET_free (msgw->msg);
1689 if (GNUNET_SCHEDULER_NO_TASK != plugin->select_task)
1691 GNUNET_SCHEDULER_cancel (plugin->select_task);
1692 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1694 if (GNUNET_SCHEDULER_NO_TASK != plugin->address_update_task)
1696 GNUNET_SCHEDULER_cancel (plugin->address_update_task);
1697 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1699 if (NULL != plugin->unix_sock.desc)
1701 GNUNET_break (GNUNET_OK ==
1702 GNUNET_NETWORK_socket_close (plugin->unix_sock.desc));
1703 plugin->unix_sock.desc = NULL;
1704 plugin->with_ws = GNUNET_NO;
1706 GNUNET_CONTAINER_multipeermap_iterate (plugin->session_map,
1707 &get_session_delete_it, plugin);
1708 GNUNET_CONTAINER_multipeermap_destroy (plugin->session_map);
1709 if (NULL != plugin->rs)
1710 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1711 if (NULL != plugin->ws)
1712 GNUNET_NETWORK_fdset_destroy (plugin->ws);
1713 GNUNET_free (plugin->unix_socket_path);
1714 GNUNET_free (plugin);
1719 /* end of plugin_transport_unix.c */