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Comparing gvpe/src/vpn.C (file contents):
Revision 1.17 by pcg, Wed Oct 15 06:06:41 2003 UTC vs.
Revision 1.28 by pcg, Thu Mar 3 16:54:34 2005 UTC

1/* 1/*
2 vpn.C -- handle the protocol, encryption, handshaking etc. 2 vpn.C -- handle the protocol, encryption, handshaking etc.
3 Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
3 4
5 This file is part of GVPE.
6
4 This program is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by 8 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or 9 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version. 10 (at your option) any later version.
8 11
9 This program is distributed in the hope that it will be useful, 12 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details. 15 GNU General Public License for more details.
13 16
14 You should have received a copy of the GNU General Public License 17 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software 18 along with gvpe; if not, write to the Free Software
16 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17*/ 20*/
18 21
19#include "config.h" 22#include "config.h"
20 23
21#include <list> 24#include <list>
22 25
26#include <cstdio>
27#include <cstring>
23#include <cstdlib> 28#include <cstdlib>
24#include <cstring>
25#include <cstdio>
26 29
27#include <sys/types.h> 30#include <sys/types.h>
28#include <sys/socket.h> 31#include <sys/socket.h>
29#include <sys/wait.h> 32#include <sys/wait.h>
30#include <errno.h> 33#include <errno.h>
… …
39 42
40#include "connection.h" 43#include "connection.h"
41#include "util.h" 44#include "util.h"
42#include "vpn.h" 45#include "vpn.h"
43 46
47vpn network; // THE vpn (bad design...)
48
44///////////////////////////////////////////////////////////////////////////// 49/////////////////////////////////////////////////////////////////////////////
45 50
46const char *vpn::script_if_up () 51const char *vpn::script_if_up ()
47{ 52{
48 // the tunnel device mtu should be the physical mtu - overhead 53 // the tunnel device mtu should be the physical mtu - overhead
… …
51 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion 56 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
52 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round 57 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
53 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again 58 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
54 59
55 char *env; 60 char *env;
56 asprintf (&env, "CONFBASE=%s", confbase); 61 asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
57 putenv (env);
58 asprintf (&env, "NODENAME=%s", THISNODE->nodename); 62 asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
59 putenv (env);
60 asprintf (&env, "NODEID=%d", THISNODE->id); 63 asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
61 putenv (env);
62 asprintf (&env, "IFNAME=%s", tap->interface ()); 64 asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63 putenv (env); 65 asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
66 asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
64 asprintf (&env, "MTU=%d", mtu); 67 asprintf (&env, "MTU=%d", mtu); putenv (env);
65 putenv (env);
66 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", 68 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
67 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, 69 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
68 THISNODE->id & 0xff); 70 THISNODE->id & 0xff);
69 putenv (env); 71 putenv (env);
70 72
… …
98 sockinfo si (THISNODE, PROT_IPv4); 100 sockinfo si (THISNODE, PROT_IPv4);
99 101
100 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) 102 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
101 { 103 {
102 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); 104 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
103 exit (1); 105 exit (EXIT_FAILURE);
104 } 106 }
105 107
106 ipv4_ev_watcher.start (ipv4_fd, POLLIN); 108 ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
107 } 109 }
108 110
109 udpv4_fd = -1; 111 udpv4_fd = -1;
110 112
111 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) 113 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
… …
136 sockinfo si (THISNODE, PROT_UDPv4); 138 sockinfo si (THISNODE, PROT_UDPv4);
137 139
138 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 140 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
139 { 141 {
140 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); 142 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
141 exit (1); 143 exit (EXIT_FAILURE);
142 } 144 }
143 145
144 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 146 udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
145 } 147 }
146 148
147 icmpv4_fd = -1; 149 icmpv4_fd = -1;
148 150
149#if ENABLE_ICMP 151#if ENABLE_ICMP
… …
180 sockinfo si (THISNODE, PROT_ICMPv4); 182 sockinfo si (THISNODE, PROT_ICMPv4);
181 183
182 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) 184 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
183 { 185 {
184 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); 186 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
185 exit (1); 187 exit (EXIT_FAILURE);
186 } 188 }
187 189
188 icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); 190 icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
189 } 191 }
190#endif 192#endif
191 193
192 tcpv4_fd = -1; 194 tcpv4_fd = -1;
193 195
… …
210 sockinfo si (THISNODE, PROT_TCPv4); 212 sockinfo si (THISNODE, PROT_TCPv4);
211 213
212 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) 214 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
213 { 215 {
214 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); 216 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
215 exit (1); 217 exit (EXIT_FAILURE);
216 } 218 }
217 219
218 if (listen (tcpv4_fd, 5)) 220 if (listen (tcpv4_fd, 5))
219 { 221 {
220 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); 222 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
221 exit (1); 223 exit (EXIT_FAILURE);
224 }
225
226 tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
227 }
228#endif
229
230#if ENABLE_DNS
231 if (THISNODE->protocols & PROT_DNSv4)
232 {
233 dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
234
235 if (dnsv4_fd < 0)
236 return -1;
237
238 // standard daemon practise...
239 {
240 int oval = 1;
241 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
242 }
243
244 sockinfo si (THISNODE, PROT_DNSv4);
245
246 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
222 } 247 {
248 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
249 exit (EXIT_FAILURE);
250 }
223 251
224 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); 252 dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
225 } 253 }
226#endif 254#endif
227 255
228 tap = new tap_device (); 256 tap = new tap_device ();
229 if (!tap) //D this, of course, never catches 257 if (!tap) //D this, of course, never catches
230 { 258 {
231 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); 259 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
232 exit (1); 260 exit (EXIT_FAILURE);
233 } 261 }
234 262
235 run_script (run_script_cb (this, &vpn::script_if_up), true); 263 run_script (run_script_cb (this, &vpn::script_if_up), true);
236 264
237 tap_ev_watcher.start (tap->fd, POLLIN); 265 tap_ev_watcher.start (tap->fd, EVENT_READ);
238 266
239 reconnect_all (); 267 reconnect_all ();
240 268
241 return 0; 269 return 0;
242}
243
244// send a vpn packet out to other hosts
245bool
246vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
247{
248 switch (si.prot)
249 {
250 case PROT_IPv4:
251 return send_ipv4_packet (pkt, si, tos);
252
253 case PROT_UDPv4:
254 return send_udpv4_packet (pkt, si, tos);
255
256#if ENABLE_TCP
257 case PROT_TCPv4:
258 return send_tcpv4_packet (pkt, si, tos);
259#endif
260
261#if ENABLE_ICMP
262 case PROT_ICMPv4:
263 return send_icmpv4_packet (pkt, si, tos);
264#endif
265
266 default:
267 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
268 return false;
269 }
270} 270}
271 271
272bool 272bool
273vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 273vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
274{ 274{
… …
332 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 332 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
333#endif 333#endif
334 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 334 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
335 335
336 return true; 336 return true;
337}
338
339void
340vpn::inject_data_packet (tap_packet *pkt, int dst)
341{
342 if (dst)
343 {
344 // unicast
345 if (dst != THISNODE->id)
346 conns[dst - 1]->inject_data_packet (pkt);
347 }
348 else
349 {
350 // broadcast, this is ugly, but due to the security policy
351 // we have to connect to all hosts...
352 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
353 if ((*c)->conf != THISNODE)
354 (*c)->inject_data_packet (pkt, true);
355 }
337} 356}
338 357
339void 358void
340vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 359vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
341{ 360{
… …
358 connection *c = conns[src - 1]; 377 connection *c = conns[src - 1];
359 378
360 if (dst == 0) 379 if (dst == 0)
361 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), 380 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
362 c->conf->nodename, (const char *)rsi); 381 c->conf->nodename, (const char *)rsi);
363 else if (dst != 0 && dst != THISNODE->id) 382 else if (dst != THISNODE->id)
364 { 383 {
365 if (THISNODE->routerprio) 384 if (THISNODE->routerprio)
366 // the tos setting gets lost here. who cares. 385 // the tos setting gets lost here. who cares.
367 conns[dst - 1]->inject_vpn_packet (pkt); 386 conns[dst - 1]->inject_vpn_packet (pkt);
368 else 387 else
… …
377} 396}
378 397
379void 398void
380vpn::ipv4_ev (io_watcher &w, short revents) 399vpn::ipv4_ev (io_watcher &w, short revents)
381{ 400{
382 if (revents & (POLLIN | POLLERR)) 401 if (revents & EVENT_READ)
383 { 402 {
384 vpn_packet *pkt = new vpn_packet; 403 vpn_packet *pkt = new vpn_packet;
385 struct sockaddr_in sa; 404 struct sockaddr_in sa;
386 socklen_t sa_len = sizeof (sa); 405 socklen_t sa_len = sizeof (sa);
387 int len; 406 int len;
… …
406 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 425 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
407 } 426 }
408 427
409 delete pkt; 428 delete pkt;
410 } 429 }
411 else if (revents & POLLHUP)
412 {
413 // this cannot ;) happen on udp sockets
414 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
415 exit (1);
416 }
417 else 430 else
418 { 431 {
419 slog (L_ERR, 432 slog (L_ERR,
420 _("FATAL: unknown revents %08x in socket, terminating\n"), 433 _("FATAL: unknown revents %08x in socket, terminating\n"),
421 revents); 434 revents);
422 exit (1); 435 exit (EXIT_FAILURE);
423 } 436 }
424} 437}
425 438
426#if ENABLE_ICMP 439#if ENABLE_ICMP
427void 440void
428vpn::icmpv4_ev (io_watcher &w, short revents) 441vpn::icmpv4_ev (io_watcher &w, short revents)
429{ 442{
430 if (revents & (POLLIN | POLLERR)) 443 if (revents & EVENT_READ)
431 { 444 {
432 vpn_packet *pkt = new vpn_packet; 445 vpn_packet *pkt = new vpn_packet;
433 struct sockaddr_in sa; 446 struct sockaddr_in sa;
434 socklen_t sa_len = sizeof (sa); 447 socklen_t sa_len = sizeof (sa);
435 int len; 448 int len;
… …
460 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 473 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
461 } 474 }
462 475
463 delete pkt; 476 delete pkt;
464 } 477 }
465 else if (revents & POLLHUP)
466 {
467 // this cannot ;) happen on udp sockets
468 slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
469 exit (1);
470 }
471 else 478 else
472 { 479 {
473 slog (L_ERR, 480 slog (L_ERR,
474 _("FATAL: unknown revents %08x in socket, terminating\n"), 481 _("FATAL: unknown revents %08x in socket, terminating\n"),
475 revents); 482 revents);
476 exit (1); 483 exit (EXIT_FAILURE);
477 } 484 }
478} 485}
479#endif 486#endif
480 487
481void 488void
482vpn::udpv4_ev (io_watcher &w, short revents) 489vpn::udpv4_ev (io_watcher &w, short revents)
483{ 490{
484 if (revents & (POLLIN | POLLERR)) 491 if (revents & EVENT_READ)
485 { 492 {
486 vpn_packet *pkt = new vpn_packet; 493 vpn_packet *pkt = new vpn_packet;
487 struct sockaddr_in sa; 494 struct sockaddr_in sa;
488 socklen_t sa_len = sizeof (sa); 495 socklen_t sa_len = sizeof (sa);
489 int len; 496 int len;
… …
504 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); 511 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
505 } 512 }
506 513
507 delete pkt; 514 delete pkt;
508 } 515 }
509 else if (revents & POLLHUP)
510 {
511 // this cannot ;) happen on udp sockets
512 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
513 exit (1);
514 }
515 else 516 else
516 { 517 {
517 slog (L_ERR, 518 slog (L_ERR,
518 _("FATAL: unknown revents %08x in socket, terminating\n"), 519 _("FATAL: unknown revents %08x in socket, terminating\n"),
519 revents); 520 revents);
520 exit (1); 521 exit (EXIT_FAILURE);
521 } 522 }
522} 523}
523 524
524void 525void
525vpn::tap_ev (io_watcher &w, short revents) 526vpn::tap_ev (io_watcher &w, short revents)
526{ 527{
527 if (revents & POLLIN) 528 if (revents & EVENT_READ)
528 { 529 {
529 /* process data */ 530 /* process data */
530 tap_packet *pkt; 531 tap_packet *pkt;
531 532
532 pkt = tap->recv (); 533 pkt = tap->recv ();
… …
540 int src = mac2id (pkt->src); 541 int src = mac2id (pkt->src);
541 542
542 if (src != THISNODE->id) 543 if (src != THISNODE->id)
543 { 544 {
544 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); 545 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
545 exit (1); 546 exit (EXIT_FAILURE);
546 } 547 }
547 548
548 if (dst == THISNODE->id) 549 if (dst == THISNODE->id)
549 { 550 {
550 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); 551 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
551 exit (1); 552 exit (EXIT_FAILURE);
552 } 553 }
553 554
554 if (dst > conns.size ()) 555 if (dst > conns.size ())
555 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); 556 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
556 else 557 else
557 {
558 if (dst)
559 {
560 // unicast
561 if (dst != THISNODE->id)
562 conns[dst - 1]->inject_data_packet (pkt);
563 }
564 else
565 {
566 // broadcast, this is ugly, but due to the security policy
567 // we have to connect to all hosts...
568 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
569 if ((*c)->conf != THISNODE)
570 (*c)->inject_data_packet (pkt); 558 inject_data_packet (pkt, dst);
571 }
572 }
573 } 559 }
574 560
575 delete pkt; 561 delete pkt;
576 }
577 else if (revents & (POLLHUP | POLLERR))
578 {
579 slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
580 exit (1);
581 } 562 }
582 else 563 else
583 abort (); 564 abort ();
584} 565}
585 566
… …
591 if (events & EVENT_SHUTDOWN) 572 if (events & EVENT_SHUTDOWN)
592 { 573 {
593 slog (L_INFO, _("preparing shutdown...")); 574 slog (L_INFO, _("preparing shutdown..."));
594 575
595 shutdown_all (); 576 shutdown_all ();
596
597 remove_pid (pidfilename); 577 remove_pid (conf.pidfilename);
598
599 slog (L_INFO, _("terminating")); 578 slog (L_INFO, _("terminating"));
600 579 exit (EXIT_SUCCESS);
601 exit (0);
602 } 580 }
603 581
604 if (events & EVENT_RECONNECT) 582 if (events & EVENT_RECONNECT)
605 { 583 {
606 slog (L_INFO, _("forced reconnect")); 584 slog (L_INFO, _("forced reconnect"));
… …
608 reconnect_all (); 586 reconnect_all ();
609 } 587 }
610 588
611 events = 0; 589 events = 0;
612 } 590 }
613
614 w.at = TSTAMP_CANCEL;
615} 591}
616 592
617void 593void
618vpn::shutdown_all () 594vpn::shutdown_all ()
619{ 595{
… …
632 connection_init (); 608 connection_init ();
633 609
634 for (configuration::node_vector::iterator i = conf.nodes.begin (); 610 for (configuration::node_vector::iterator i = conf.nodes.begin ();
635 i != conf.nodes.end (); ++i) 611 i != conf.nodes.end (); ++i)
636 { 612 {
637 connection *conn = new connection (this); 613 connection *conn = new connection (this, *i);
638
639 conn->conf = *i;
640 conns.push_back (conn); 614 conns.push_back (conn);
641
642 conn->establish_connection (); 615 conn->establish_connection ();
643 } 616 }
644} 617}
645 618
646connection *vpn::find_router () 619connection *vpn::find_router ()
… …
709, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) 682, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
710#endif 683#endif
711#if ENABLE_ICMP 684#if ENABLE_ICMP
712, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) 685, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
713#endif 686#endif
687#if ENABLE_DNS
688, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
689#endif
714, tap_ev_watcher (this, &vpn::tap_ev) 690, tap_ev_watcher (this, &vpn::tap_ev)
715{ 691{
716} 692}
717 693
718vpn::~vpn () 694vpn::~vpn ()

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