3 * Communication with the peer
5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Trivial IP Encryption (TrIPE).
12 * TrIPE is free software: you can redistribute it and/or modify it under
13 * the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 3 of the License, or (at your
15 * option) any later version.
17 * TrIPE is distributed in the hope that it will be useful, but WITHOUT
18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 * You should have received a copy of the GNU General Public License
23 * along with TrIPE. If not, see <https://www.gnu.org/licenses/>.
26 /*----- Header files ------------------------------------------------------*/
30 /*----- Global state ------------------------------------------------------*/
32 udpsocket udpsock
[NADDRFAM
];
34 /*----- Static variables --------------------------------------------------*/
36 static sym_table byname
;
37 static addrmap byaddr
;
38 static unsigned nmobile
;
39 static struct tunnel_node
{
40 struct tunnel_node
*next
;
41 const tunnel_ops
*tops
;
42 } *tunnels
, **tunnels_tail
= &tunnels
;
43 const tunnel_ops
*dflttun
;
45 /*----- Main code ---------------------------------------------------------*/
47 /* --- @p_pingtype@ --- *
49 * Arguments: @unsigned msg@ = message type
51 * Returns: String to describe the message.
54 static const char *p_pingtype(unsigned msg
)
56 switch (msg
& MSG_TYPEMASK
) {
59 return "transport-ping";
62 return "encrypted-ping";
68 /* --- @p_ponged@ --- *
70 * Arguments: @peer *p@ = peer packet arrived from
71 * @unsigned msg@ = message type
72 * @buf *b@ = buffer containing payload
76 * Use: Processes a ping response.
79 static void p_ponged(peer
*p
, unsigned msg
, buf
*b
)
86 trace(T_PEER
, "peer: received %s reply from %s",
87 p_pingtype(msg
), p
->spec
.name
);
88 trace_block(T_PACKET
, "peer: ping contents", BBASE(b
), BSZ(b
));
91 if (buf_getu32(b
, &id
) ||
92 (magic
= buf_get(b
, sizeof(pg
->magic
))) == 0 ||
94 a_warn("PEER", "?PEER", p
, "malformed-%s", p_pingtype(msg
), A_END
);
98 for (pg
= p
->pings
; pg
; pg
= pg
->next
) {
104 "unexpected-%s", p_pingtype(msg
),
105 "0x%08lx", (unsigned long)id
,
110 if (memcmp(magic
, pg
->magic
, sizeof(pg
->magic
)) != 0) {
111 a_warn("PEER", "?PEER", p
, "corrupt-%s", p_pingtype(msg
), A_END
);
114 p_pingdone(pg
, PING_OK
);
117 /* --- @p_rxupdstats@ --- *
119 * Arguments: @peer *p@ = peer to update
120 * @size_t n@ = size of incoming packet
124 * Use: Updates the peer's incoming packet statistics.
127 static void p_rxupdstats(peer
*p
, size_t n
)
129 p
->st
.t_last
= time(0);
134 /* --- @p_encrypt@ --- *
136 * Arguments: @peer *p@ = peer to encrypt message to
137 * @int ty@ message type to send
138 * @buf *bin, *bout@ = input and output buffers
142 * Use: Convenience function for packet encryption. Forces
143 * renegotiation when necessary. Check for the output buffer
144 * being broken to find out whether the encryption was
148 static int p_encrypt(peer
*p
, int ty
, buf
*bin
, buf
*bout
)
150 int err
= ksl_encrypt(&p
->ks
, ty
, bin
, bout
);
152 if (err
== KSERR_REGEN
) {
161 /* --- @p_updateaddr@ --- *
163 * Arguments: @peer *p@ = pointer to peer block
164 * @const addr *a@ = address to associate with this peer
166 * Returns: Zero if the address was changed; @+1@ if it was already
169 * Use: Updates our idea of @p@'s address.
172 int p_updateaddr(peer
*p
, const addr
*a
)
175 peer_byaddr
*pa
, *qa
;
179 /* --- Figure out how to proceed --- *
181 * If this address already belongs to a different peer, then swap the
182 * addresses over. This doesn't leave the displaced peer in an especially
183 * good state, but it ought to get sorted out soon enough.
186 pa
= am_find(&byaddr
, a
, sizeof(peer_byaddr
), &f
);
190 T( trace(T_PEER
, "peer: updating address for `%s'", p_name(p
)); )
191 am_remove(&byaddr
, p
->byaddr
);
192 p
->byaddr
= pa
; p
->spec
.sa
= *a
; pa
->p
= p
;
193 p
->afix
= afix(p
->spec
.sa
.sa
.sa_family
); assert(p
->afix
>= 0);
194 a_notify("NEWADDR", "?PEER", p
, "?ADDR", a
, A_END
);
197 q
= pa
->p
; qa
= p
->byaddr
;
198 T( trace(T_PEER
, "peer: swapping addresses for `%s' and `%s'",
199 p_name(p
), p_name(q
)); )
200 q
->byaddr
= qa
; qa
->p
= q
; q
->spec
.sa
= p
->spec
.sa
;
201 p
->byaddr
= pa
; pa
->p
= p
; p
->spec
.sa
= *a
;
202 ix
= p
->afix
; p
->afix
= q
->afix
; q
->afix
= ix
;
203 a_notify("NEWADDR", "?PEER", p
, "?ADDR", a
, A_END
);
204 a_notify("NEWADDR", "?PEER", q
, "?ADDR", &q
->spec
.sa
, A_END
);
209 /* --- @p_decrypt@ --- *
211 * Arguments: @peer **pp@ = pointer to peer to decrypt message from
212 * @addr *a@ = address the packet arrived on
213 * @size_t n@ = size of original incoming packet
214 * @int ty@ = message type to expect
215 * @buf *bin, *bout@ = input and output buffers
217 * Returns: Zero on success; nonzero on error.
219 * Use: Convenience function for packet decryption. Reports errors
220 * and updates statistics appropriately.
222 * If @*pp@ is null on entry and there are mobile peers then we
223 * see if any of them can decrypt the packet. If so, we record
224 * @*a@ as the peer's new address and send a notification.
227 static int p_decrypt(peer
**pp
, addr
*a
, size_t n
,
228 int ty
, buf
*bin
, buf
*bout
)
231 int err
= KSERR_DECRYPT
;
233 /* --- If we have a match on the source address then try that first --- */
237 T( trace(T_PEER
, "peer: decrypting packet from known peer `%s'",
239 if ((err
= ksl_decrypt(&q
->ks
, ty
, bin
, bout
)) != KSERR_DECRYPT
||
240 !(q
->spec
.f
& PSF_MOBILE
) || nmobile
== 1) {
244 T( trace(T_PEER
, "peer: failed to decrypt: try other mobile peers..."); )
246 T( trace(T_PEER
, "peer: unknown source: trying mobile peers...") );
252 /* --- See whether any mobile peer is interested --- */
256 if (qq
== q
|| !(qq
->spec
.f
& PSF_MOBILE
)) continue;
257 if ((err
= ksl_decrypt(&qq
->ks
, ty
, bin
, bout
)) == KSERR_DECRYPT
) {
258 T( trace(T_PEER
, "peer: peer `%s' failed to decrypt",
265 trace(T_PEER
, "peer: peer `%s' reports success", p_name(qq
));
267 trace(T_PEER
, "peer: peer `%s' reports decryption error %d",
275 /* --- We've searched the mobile peers --- */
280 a_warn("PEER", "-", "unexpected-source", "?ADDR", a
, A_END
);
282 a_warn("PEER", "?PEER", p
, "decrypt-failed",
283 "error-code", "%d", err
, A_END
);
289 /* --- We found one that accepted, so update the peer's address --- */
299 if (p
) p
->st
.n_reject
++;
300 a_warn("PEER", "?PEER", p
, "decrypt-failed",
301 "error-code", "%d", err
, A_END
);
309 /* --- @p_read@ --- *
311 * Arguments: @int fd@ = file descriptor to read from
312 * @unsigned mode@ = what happened
313 * @void *v@ = an uninteresting pointer
317 * Use: Reads a packet from somewhere.
320 static void p_read(int fd
, unsigned mode
, void *v
)
330 char name
[NI_MAXHOST
], svc
[NI_MAXSERV
];
333 /* --- Read the data --- */
337 n
= recvfrom(fd
, buf_i
, sizeof(buf_i
), 0, &a
.sa
, &sz
);
339 a_warn("PEER", "-", "socket-read-error", "?ERRNO", A_END
);
343 ix
= afix(a
.sa
.sa_family
);
344 getnameinfo(&a
.sa
, sz
, name
, sizeof(name
), svc
, sizeof(svc
),
345 NI_NUMERICHOST
| NI_NUMERICSERV
);
348 /* --- If the packet is a greeting, don't check peers --- */
350 if (n
&& buf_i
[0] == (MSG_MISC
| MISC_GREET
)) {
352 trace(T_PEER
, "peer: greeting received from %s %s %s",
353 aftab
[ix
].name
, name
, svc
);
354 trace_block(T_PACKET
, "peer: greeting contents", buf_i
, n
);
356 buf_init(&b
, buf_i
, n
);
358 if (c_check(0, 0, &b
) || BLEFT(&b
)) {
359 a_warn("PEER", "-", "invalid-greeting", A_END
);
363 "?B64", buf_i
+ 1, (size_t)(n
- 1),
369 /* --- Find the appropriate peer --- *
371 * At this stage, don't worry too much about whether we actually found it.
374 p
= p_findbyaddr(&a
);
379 "peer: packet received from `%s' from address %s %s %s",
380 p_name(p
), aftab
[ix
].name
, name
, svc
);
382 trace(T_PEER
, "peer: packet received from unknown address %s %s %s",
383 aftab
[ix
].name
, name
, svc
);
385 trace_block(T_PACKET
, "peer: packet contents", buf_i
, n
);
388 /* --- Pick the packet apart --- */
390 buf_init(&b
, buf_i
, n
);
391 if ((ch
= buf_getbyte(&b
)) < 0) {
392 a_warn("PEER", "?PEER", p
, "bad-packet", "no-type", A_END
);
395 switch (ch
& MSG_CATMASK
) {
397 if (ch
& MSG_TYPEMASK
) {
401 "unknown-type", "0x%02x", ch
,
403 if (p
) p
->st
.n_reject
++;
406 buf_init(&bb
, buf_o
, sizeof(buf_o
));
407 if (p_decrypt(&p
, &a
, n
, MSG_PACKET
, &b
, &bb
))
411 p
->st
.sz_ipin
+= BSZ(&b
);
412 p
->t
->ops
->inject(p
->t
, &bb
);
415 a_warn("PEER", "?PEER", p
, "packet-build-failed", A_END
);
419 if (p
) p_rxupdstats(p
, n
);
420 if (kx_message(p ?
&p
->kx
: 0, &a
, ch
& MSG_TYPEMASK
, &b
)) goto unexp
;
423 switch (ch
& MSG_TYPEMASK
) {
427 T( trace(T_PEER
, "peer: received NOP packet"); )
432 buf_put(p_txstart(p
, MSG_MISC
| MISC_PONG
), BCUR(&b
), BLEFT(&b
));
438 p_ponged(p
, MISC_PONG
, &b
);
441 buf_init(&bb
, buf_t
, sizeof(buf_t
));
442 if (p_decrypt(&p
, &a
, n
, ch
, &b
, &bb
))
446 p_encrypt(p
, MSG_MISC
| MISC_EPONG
, &bb
,
447 p_txstart(p
, MSG_MISC
| MISC_EPONG
));
452 buf_init(&bb
, buf_t
, sizeof(buf_t
));
453 if (p_decrypt(&p
, &a
, n
, ch
, &b
, &bb
))
457 p_ponged(p
, MISC_EPONG
, &bb
);
461 buf_init(&bb
, buf_t
, sizeof(buf_t
));
462 if (p_decrypt(&p
, &a
, n
, ch
, &b
, &bb
)) return;
463 if (!(p
->spec
.f
&PSF_EPHEM
)) return;
466 if (BSZ(&bb
)) return;
473 if (p
) p
->st
.n_reject
++;
477 "unknown-category", "0x%02x", ch
,
481 a_warn("PEER", "-", "unexpected-source", "?ADDR", &a
, A_END
);
486 /* --- @p_txstart@ --- *
488 * Arguments: @peer *p@ = pointer to peer block
489 * @unsigned msg@ = message type code
491 * Returns: A pointer to a buffer to write to.
493 * Use: Starts sending to a peer. Only one send can happen at a
497 buf
*p_txstart(peer
*p
, unsigned msg
)
499 buf_init(&p
->b
, buf_o
, sizeof(buf_o
));
500 buf_putbyte(&p
->b
, msg
);
504 /* --- @p_txaddr@ --- *
506 * Arguments: @const addr *a@ = recipient address
507 * @const void *p@ = pointer to packet to send
508 * @size_t sz@ = length of packet
510 * Returns: Zero if successful, nonzero on error.
512 * Use: Sends a packet to an address which (possibly) isn't a current
516 int p_txaddr(const addr
*a
, const void *p
, size_t sz
)
518 socklen_t sasz
= addrsz(a
);
521 if ((i
= afix(a
->sa
.sa_family
)) < 0) {
522 a_warn("PEER", "?ADDR", a
, "disabled-address-family", A_END
);
525 IF_TRACING(T_PEER
, trace_block(T_PACKET
, "peer: sending packet", p
, sz
); )
526 if (sendto(udpsock
[i
].sf
.fd
, p
, sz
, 0, &a
->sa
, sasz
) < 0) {
527 a_warn("PEER", "?ADDR", a
, "socket-write-error", "?ERRNO", A_END
);
533 /* --- @p_txend@ --- *
535 * Arguments: @peer *p@ = pointer to peer block
539 * Use: Sends a packet to the peer.
542 static void p_setkatimer(peer
*);
544 static int p_dotxend(peer
*p
)
546 socklen_t sasz
= addrsz(&p
->spec
.sa
);
549 a_warn("PEER", "?PEER", p
, "packet-build-failed", A_END
);
552 IF_TRACING(T_PEER
, trace_block(T_PACKET
, "peer: sending packet",
553 BBASE(&p
->b
), BLEN(&p
->b
)); )
554 if (sendto(udpsock
[p
->afix
].sf
.fd
, BBASE(&p
->b
), BLEN(&p
->b
),
555 0, &p
->spec
.sa
.sa
, sasz
) < 0) {
556 a_warn("PEER", "?PEER", p
, "socket-write-error", "?ERRNO", A_END
);
560 p
->st
.sz_out
+= BLEN(&p
->b
);
565 void p_txend(peer
*p
)
567 if (p_dotxend(p
) && p
->spec
.t_ka
) {
568 sel_rmtimer(&p
->tka
);
573 /* --- @p_pingwrite@ --- *
575 * Arguments: @ping *p@ = ping structure
576 * @buf *b@ = buffer to write in
580 * Use: Fills in a ping structure and writes the packet payload.
583 static void p_pingwrite(ping
*p
, buf
*b
)
585 static uint32 seq
= 0;
588 GR_FILL(&rand_global
, p
->magic
, sizeof(p
->magic
));
589 buf_putu32(b
, p
->id
);
590 buf_put(b
, p
->magic
, sizeof(p
->magic
));
593 /* --- @p_pingdone@ --- *
595 * Arguments: @ping *p@ = ping structure
596 * @int rc@ = return code to pass on
600 * Use: Disposes of a ping structure, maybe sending a notification.
603 void p_pingdone(ping
*p
, int rc
)
605 if (p
->prev
) p
->prev
->next
= p
->next
;
606 else p
->p
->pings
= p
->next
;
607 if (p
->next
) p
->next
->prev
= p
->prev
;
608 if (rc
!= PING_TIMEOUT
) sel_rmtimer(&p
->t
);
609 T( trace(T_PEER
, "peer: ping 0x%08lx done (rc = %d)",
610 (unsigned long)p
->id
, rc
); )
611 if (rc
>= 0) p
->func(rc
, p
->arg
);
614 /* --- @p_pingtimeout@ --- *
616 * Arguments: @struct timeval *now@ = the time now
617 * @void *pv@ = pointer to ping block
621 * Use: Called when a ping times out.
624 static void p_pingtimeout(struct timeval
*now
, void *pv
)
628 T( trace(T_PEER
, "peer: ping 0x%08lx timed out", (unsigned long)p
->id
); )
629 p_pingdone(p
, PING_TIMEOUT
);
632 /* --- @p_pingsend@ --- *
634 * Arguments: @peer *p@ = destination peer
635 * @ping *pg@ = structure to fill in
636 * @unsigned type@ = message type
637 * @unsigned long timeout@ = how long to wait before giving up
638 * @void (*func)(int, void *)@ = callback function
639 * @void *arg@ = argument for callback
641 * Returns: Zero if successful, nonzero if it failed.
643 * Use: Sends a ping to a peer. Call @func@ with a nonzero argument
644 * if we get an answer within the timeout, or zero if no answer.
647 int p_pingsend(peer
*p
, ping
*pg
, unsigned type
,
648 unsigned long timeout
,
649 void (*func
)(int, void *), void *arg
)
657 b
= p_txstart(p
, MSG_MISC
| MISC_PING
);
662 pg
->msg
= MISC_EPONG
;
663 b
= p_txstart(p
, MSG_MISC
| MISC_EPING
);
664 buf_init(&bb
, buf_t
, sizeof(buf_t
));
665 p_pingwrite(pg
, &bb
);
667 p_encrypt(p
, MSG_MISC
| MISC_EPING
, &bb
, b
);
682 if (p
->pings
) p
->pings
->prev
= pg
;
684 gettimeofday(&tv
, 0);
685 tv
.tv_sec
+= timeout
;
686 sel_addtimer(&sel
, &pg
->t
, &tv
, p_pingtimeout
, pg
);
687 T( trace(T_PEER
, "peer: send %s 0x%08lx to %s",
688 p_pingtype(type
), (unsigned long)pg
->id
, p
->spec
.name
); )
692 /* --- @p_greet@ --- *
694 * Arguments: @peer *p@ = peer to send to
695 * @const void *c@ = pointer to challenge
696 * @size_t sz@ = size of challenge
700 * Use: Sends a greeting packet.
703 void p_greet(peer
*p
, const void *c
, size_t sz
)
705 buf
*b
= p_txstart(p
, MSG_MISC
| MISC_GREET
);
712 * Arguments: @peer *p@ = pointer to peer block
713 * @buf *b@ = buffer containing incoming packet
717 * Use: Handles a packet which needs to be sent to a peer.
720 void p_tun(peer
*p
, buf
*b
)
722 buf
*bb
= p_txstart(p
, MSG_PACKET
);
725 p_encrypt(p
, MSG_PACKET
, b
, bb
);
726 if (BOK(bb
) && BLEN(bb
)) {
728 p
->st
.sz_ipout
+= BLEN(bb
);
733 /* --- @p_keyreload@ --- *
739 * Use: Forces a check of the daemon's keyring files.
742 void p_keyreload(void)
745 FOREACH_PEER(p
, { kx_newkeys(&p
->kx
); });
748 /* --- @p_interval@ --- *
754 * Use: Called periodically to do tidying.
757 void p_interval(void)
760 FOREACH_PEER(p
, { ksl_prune(&p
->ks
); });
763 /* --- @p_stats@ --- *
765 * Arguments: @peer *p@ = pointer to a peer block
767 * Returns: A pointer to the peer's statistics.
770 stats
*p_stats(peer
*p
) { return (&p
->st
); }
772 /* --- @p_ifname@ --- *
774 * Arguments: @peer *p@ = pointer to a peer block
776 * Returns: A pointer to the peer's interface name.
779 const char *p_ifname(peer
*p
) { return (p
->ifname
); }
781 /* --- @p_setifname@ --- *
783 * Arguments: @peer *p@ = pointer to a peer block
784 * @const char *name@ = pointer to the new name
788 * Use: Changes the name held for a peer's interface.
791 void p_setifname(peer
*p
, const char *name
)
794 p
->ifname
= xstrdup(name
);
795 if (p
->spec
.tops
->setifname
)
796 p
->spec
.tops
->setifname(p
->t
, name
);
799 /* --- @p_addr@ --- *
801 * Arguments: @peer *p@ = pointer to a peer block
803 * Returns: A pointer to the peer's address.
806 const addr
*p_addr(peer
*p
) { return (&p
->spec
.sa
); }
808 /* --- @p_bind@ --- *
810 * Arguments: @struct addrinfo *ailist@ = addresses to bind to
812 * Returns: Zero on success, @-1@ on failure.
814 * Use: Binds to the main UDP sockets.
817 int p_bind(struct addrinfo
*ailist
)
824 unsigned port
, lastport
= 0;
828 for (i
= 0; i
< NADDRFAM
; i
++) udpsock
[i
].sf
.fd
= -1;
830 for (ai
= ailist
; ai
; ai
= ai
->ai_next
) {
831 if ((i
= afix(ai
->ai_family
)) < 0) continue;
832 if (udpsock
[i
].sf
.fd
!= -1) continue;
834 /* --- Note on socket buffer sizes --- *
836 * For some bizarre reason, Linux 2.2 (at least) doubles the socket
837 * buffer sizes I pass to @setsockopt@. I'm not putting special-case
838 * code here for Linux: BSD (at least TCPv2) does what I tell it rather
839 * than second-guessing me.
842 if ((fd
= socket(ai
->ai_family
, SOCK_DGRAM
, 0)) < 0) {
843 a_warn("PEER", "-", "udp-socket", "%s", aftab
[i
].name
,
844 "create-failed", "?ERRNO", A_END
);
847 if (i
== AFIX_INET6
&&
848 setsockopt(fd
, IPPROTO_IPV6
, IPV6_V6ONLY
, &yes
, sizeof(yes
))) {
849 a_warn("PEER", "-", "udp-socket", "%s", aftab
[i
].name
,
850 "set-v6only-failed", "?ERRNO", A_END
);
853 assert(ai
->ai_addrlen
<= sizeof(a
));
854 memcpy(&a
, ai
->ai_addr
, ai
->ai_addrlen
);
855 if ((port
= getport(&a
)) == 0 && lastport
) setport(&a
, lastport
);
856 if (bind(fd
, &a
.sa
, addrsz(&a
))) {
857 a_warn("PEER", "-", "udp-socket", "%s", aftab
[i
].name
,
858 "bind-failed", "?ERRNO", A_END
);
861 if (setsockopt(fd
, SOL_SOCKET
, SO_RCVBUF
, &len
, sizeof(len
)) ||
862 setsockopt(fd
, SOL_SOCKET
, SO_SNDBUF
, &len
, sizeof(len
))) {
863 a_warn("PEER", "-", "udp-socket", "%s", aftab
[i
].name
,
864 "set-buffers-failed", "?ERRNO", A_END
);
867 fdflags(fd
, O_NONBLOCK
, O_NONBLOCK
, FD_CLOEXEC
, FD_CLOEXEC
);
869 udpsock
[i
].port
= port
;
872 if (getsockname(fd
, &a
.sa
, &sz
)) {
873 a_warn("PEER", "-", "udp-socket", "%s", aftab
[i
].name
,
874 "read-local-address-failed", "?ERRNO", A_END
);
877 udpsock
[i
].port
= lastport
= getport(&a
);
879 T( trace(T_PEER
, "peer: created %s socket", aftab
[i
].name
); )
880 sel_initfile(&sel
, &udpsock
[i
].sf
, fd
, SEL_READ
, p_read
, 0);
881 sel_addfile(&udpsock
[i
].sf
);
888 if (fd
!= -1) close(fd
);
893 /* --- @p_unbind@ --- *
899 * Use: Unbinds the UDP sockets. There must not be any active peers,
900 * and none can be created until the sockets are rebound.
908 { peer_iter it
; p_mkiter(&it
); assert(!p_next(&it
)); }
911 for (i
= 0; i
< NADDRFAM
; i
++) {
912 if (udpsock
[i
].sf
.fd
== -1) continue;
913 sel_rmfile(&udpsock
[i
].sf
);
914 close(udpsock
[i
].sf
.fd
);
915 udpsock
[i
].sf
.fd
= -1;
919 /* --- @p_init@ --- *
925 * Use: Initializes the peer system.
934 /* --- @p_addtun@ --- *
936 * Arguments: @const tunnel_ops *tops@ = tunnel ops to add
938 * Returns: Zero on success, @-1@ on failure.
940 * Use: Adds a tunnel class to the list of known classes, if it
941 * initializes properly. If there is no current default tunnel,
942 * then this one is made the default.
944 * Does nothing if the tunnel class is already known. So adding
945 * a bunch of tunnels takes quadratic time, but there will be
946 * too few to care about.
949 int p_addtun(const tunnel_ops
*tops
)
951 struct tunnel_node
*tn
;
953 for (tn
= tunnels
; tn
; tn
= tn
->next
)
954 if (tn
->tops
== tops
) return (0);
955 if (tops
->init()) return (-1);
956 tn
= CREATE(struct tunnel_node
);
957 tn
->next
= 0; tn
->tops
= tops
;
958 *tunnels_tail
= tn
; tunnels_tail
= &tn
->next
;
959 if (!dflttun
) dflttun
= tops
;
963 /* --- @p_setdflttun@ --- *
965 * Arguments: @const tunnel_ops *tops@ = tunnel ops to set
969 * Use: Sets the default tunnel. It must already be registered. The
970 * old default is forgotten.
973 void p_setdflttun(const tunnel_ops
*tops
)
976 /* --- @p_dflttun@ --- *
980 * Returns: A pointer to the current default tunnel operations, or null
981 * if no tunnels are defined.
984 const tunnel_ops
*p_dflttun(void) { return (dflttun
); }
986 /* --- @p_findtun@ --- *
988 * Arguments: @const char *name@ = tunnel name
990 * Returns: Pointer to the tunnel operations, or null.
992 * Use: Finds the operations for a named tunnel class.
995 const tunnel_ops
*p_findtun(const char *name
)
997 const struct tunnel_node
*tn
;
999 for (tn
= tunnels
; tn
; tn
= tn
->next
)
1000 if (mystrieq(tn
->tops
->name
, name
) == 0) return (tn
->tops
);
1004 /* --- @p_mktuniter@ --- *
1006 * Arguments: @tuniter *i@ = pointer to iterator to initialize
1010 * Use: Initializes a tunnel iterator.
1013 void p_mktuniter(tun_iter
*i
) { i
->next
= tunnels
; }
1015 /* --- @p_nexttun@ --- *
1017 * Arguments: @tuniter *i@ = pointer to iterator
1019 * Returns: Pointer to the next tunnel's operations, or null.
1022 const tunnel_ops
*p_nexttun(tun_iter
*i
)
1024 const struct tunnel_node
*tn
= i
->next
;
1026 if (!tn
) return (0);
1027 else { i
->next
= tn
->next
; return (tn
->tops
); }
1030 /* --- @p_keepalive@ --- *
1032 * Arguments: @struct timeval *now@ = the current time
1033 * @void *pv@ = peer to wake up
1037 * Use: Sends a keepalive ping message to its peer.
1040 static void p_keepalive(struct timeval
*now
, void *pv
)
1044 p_txstart(p
, MSG_MISC
| MISC_NOP
); p_dotxend(p
);
1045 T( trace(T_PEER
, "peer: sent keepalive to %s", p
->spec
.name
); )
1049 /* --- @p_setkatimer@ --- *
1051 * Arguments: @peer *p@ = peer to set
1055 * Use: Resets the keepalive timer thing.
1058 static void p_setkatimer(peer
*p
)
1064 gettimeofday(&tv
, 0);
1065 tv
.tv_sec
+= p
->spec
.t_ka
;
1066 sel_addtimer(&sel
, &p
->tka
, &tv
, p_keepalive
, p
);
1069 /* --- @p_create@ --- *
1071 * Arguments: @peerspec *spec@ = information about this peer
1073 * Returns: Pointer to the peer block, or null if it failed.
1075 * Use: Creates a new named peer block. No peer is actually attached
1079 peer
*p_create(peerspec
*spec
)
1081 peer
*p
= CREATE(peer
);
1082 const tunnel_ops
*tops
= spec
->tops
;
1086 p
->byname
= sym_find(&byname
, spec
->name
, -1, sizeof(peer_byname
), &f
);
1088 p
->byaddr
= am_find(&byaddr
, &spec
->sa
, sizeof(peer_byaddr
), &f
);
1090 p
->byname
->p
= p
->byaddr
->p
= p
;
1092 T( trace(T_PEER
, "peer: creating new peer `%s'", spec
->name
); )
1094 p
->spec
.name
= (/*unconst*/ char *)SYM_NAME(p
->byname
);
1095 if (spec
->tag
) p
->spec
.tag
= xstrdup(spec
->tag
);
1096 if (spec
->privtag
) p
->spec
.privtag
= xstrdup(spec
->privtag
);
1097 if (spec
->knock
) p
->spec
.knock
= xstrdup(spec
->knock
);
1101 p
->afix
= afix(p
->spec
.sa
.sa
.sa_family
); assert(p
->afix
>= 0);
1102 memset(&p
->st
, 0, sizeof(stats
));
1103 p
->st
.t_start
= time(0);
1104 if (!(tops
->flags
& TUNF_PRIVOPEN
))
1106 else if ((fd
= ps_tunfd(tops
, &p
->ifname
)) < 0)
1108 if ((p
->t
= tops
->create(p
, fd
, &p
->ifname
)) == 0)
1110 T( trace(T_TUNNEL
, "peer: attached interface %s to peer `%s'",
1111 p
->ifname
, p_name(p
)); )
1114 if (kx_setup(&p
->kx
, p
, &p
->ks
, p
->spec
.f
& PSF_KXMASK
))
1119 "?ADDR", &p
->spec
.sa
,
1121 if (!(p
->spec
.f
& KXF_CORK
)) {
1122 a_notify("KXSTART", "?PEER", p
, A_END
);
1123 /* Couldn't tell anyone before */
1125 if (p
->spec
.f
& PSF_MOBILE
) nmobile
++;
1129 if (spec
->t_ka
) sel_rmtimer(&p
->tka
);
1131 p
->t
->ops
->destroy(p
->t
);
1134 if (fd
>= 0) close(fd
);
1136 am_remove(&byaddr
, p
->byaddr
);
1137 if (p
->spec
.tag
) xfree(p
->spec
.tag
);
1138 if (p
->spec
.privtag
) xfree(p
->spec
.privtag
);
1140 sym_remove(&byname
, p
->byname
);
1146 /* --- @p_name@ --- *
1148 * Arguments: @peer *p@ = pointer to a peer block
1150 * Returns: A pointer to the peer's name.
1153 const char *p_name(peer
*p
)
1154 { if (p
) return (p
->spec
.name
); else return ("-"); }
1156 /* --- @p_tag@ --- *
1158 * Arguments: @peer *p@ = pointer to a peer block
1160 * Returns: A pointer to the peer's public key tag.
1163 const char *p_tag(peer
*p
)
1164 { return (p
->spec
.tag ? p
->spec
.tag
: p
->spec
.name
); }
1166 /* --- @p_privtag@ --- *
1168 * Arguments: @peer *p@ = pointer to a peer block
1170 * Returns: A pointer to the peer's private key tag.
1173 const char *p_privtag(peer
*p
)
1174 { return (p
->spec
.privtag ? p
->spec
.privtag
: tag_priv
); }
1176 /* --- @p_spec@ --- *
1178 * Arguments: @peer *p@ = pointer to a peer block
1180 * Returns: Pointer to the peer's specification
1183 const peerspec
*p_spec(peer
*p
) { return (&p
->spec
); }
1185 /* --- @p_findbyaddr@ --- *
1187 * Arguments: @const addr *a@ = address to look up
1189 * Returns: Pointer to the peer block, or null if not found.
1191 * Use: Finds a peer by address.
1194 peer
*p_findbyaddr(const addr
*a
)
1198 if ((pa
= am_find(&byaddr
, a
, 0, 0)) != 0) {
1205 /* --- @p_find@ --- *
1207 * Arguments: @const char *name@ = name to look up
1209 * Returns: Pointer to the peer block, or null if not found.
1211 * Use: Finds a peer by name.
1214 peer
*p_find(const char *name
)
1218 if ((pn
= sym_find(&byname
, name
, -1, 0, 0)) != 0)
1223 /* --- @p_destroy@ --- *
1225 * Arguments: @peer *p@ = pointer to a peer
1226 * @int bye@ = say goodbye to the peer?
1230 * Use: Destroys a peer.
1233 void p_destroy(peer
*p
, int bye
)
1238 T( trace(T_PEER
, "peer: destroying peer `%s'", p
->spec
.name
); )
1241 b
= p_txstart(p
, MSG_MISC
| MISC_BYE
);
1242 buf_init(&bb
, buf_t
, sizeof(buf_t
));
1243 assert(BOK(&bb
)); buf_flip(&bb
);
1244 p_encrypt(p
, MSG_MISC
| MISC_BYE
, &bb
, b
);
1248 a_notify("KILL", "%s", p
->spec
.name
, A_END
);
1251 if (p
->spec
.f
& PSF_MOBILE
) nmobile
--;
1252 if (p
->ifname
) xfree(p
->ifname
);
1253 if (p
->spec
.tag
) xfree(p
->spec
.tag
);
1254 if (p
->spec
.privtag
) xfree(p
->spec
.privtag
);
1255 if (p
->spec
.knock
) xfree(p
->spec
.knock
);
1256 p
->t
->ops
->destroy(p
->t
);
1257 if (p
->spec
.t_ka
) sel_rmtimer(&p
->tka
);
1258 for (pg
= p
->pings
; pg
; pg
= ppg
) {
1260 p_pingdone(pg
, PING_PEERDIED
);
1262 sym_remove(&byname
, p
->byname
);
1263 am_remove(&byaddr
, p
->byaddr
);
1268 /* --- @p_destroyall@ --- *
1274 * Use: Destroys all of the peers, saying goodbye.
1277 void p_destroyall(void) { FOREACH_PEER(p
, { p_destroy(p
, 1); }); }
1279 /* --- @p_mkiter@ --- *
1281 * Arguments: @peer_iter *i@ = pointer to an iterator
1285 * Use: Initializes the iterator.
1288 void p_mkiter(peer_iter
*i
) { sym_mkiter(&i
->i
, &byname
); }
1290 /* --- @p_next@ --- *
1292 * Arguments: @peer_iter *i@ = pointer to an iterator
1294 * Returns: Next peer, or null if at the end.
1296 * Use: Returns the next peer.
1299 peer
*p_next(peer_iter
*i
)
1303 if ((pn
= sym_next(&i
->i
)) == 0)
1308 /*----- That's all, folks -------------------------------------------------*/