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Comparing gvpe/src/vpn.C (file contents):
Revision 1.15 by pcg, Tue Oct 14 15:48:15 2003 UTC vs.
Revision 1.22 by pcg, Sat Jan 17 01:18:36 2004 UTC

1/* 1/*
2 vpn.C -- handle the protocol, encryption, handshaking etc. 2 vpn.C -- handle the protocol, encryption, handshaking etc.
3 Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>
3 4
4 This program is free software; you can redistribute it and/or modify 5 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by 6 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 7 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version. 8 (at your option) any later version.
… …
24#include <cstring> 25#include <cstring>
25#include <cstdio> 26#include <cstdio>
26 27
27#include <sys/types.h> 28#include <sys/types.h>
28#include <sys/socket.h> 29#include <sys/socket.h>
29#include <sys/poll.h>
30#include <sys/wait.h> 30#include <sys/wait.h>
31#include <errno.h> 31#include <errno.h>
32#include <time.h> 32#include <time.h>
33#include <unistd.h> 33#include <unistd.h>
34#include <fcntl.h> 34#include <fcntl.h>
… …
40 40
41#include "connection.h" 41#include "connection.h"
42#include "util.h" 42#include "util.h"
43#include "vpn.h" 43#include "vpn.h"
44 44
45vpn network; // THE vpn (bad design...)
46
45///////////////////////////////////////////////////////////////////////////// 47/////////////////////////////////////////////////////////////////////////////
46 48
47const char *vpn::script_if_up () 49const char *vpn::script_if_up ()
48{ 50{
49 // the tunnel device mtu should be the physical mtu - overhead 51 // the tunnel device mtu should be the physical mtu - overhead
… …
52 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion 54 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
53 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round 55 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
54 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again 56 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
55 57
56 char *env; 58 char *env;
57 asprintf (&env, "CONFBASE=%s", confbase); 59 asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
58 putenv (env);
59 asprintf (&env, "NODENAME=%s", THISNODE->nodename); 60 asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
60 putenv (env);
61 asprintf (&env, "NODEID=%d", THISNODE->id); 61 asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
62 putenv (env);
63 asprintf (&env, "IFNAME=%s", tap->interface ()); 62 asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
64 putenv (env); 63 asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
64 asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65 asprintf (&env, "MTU=%d", mtu); 65 asprintf (&env, "MTU=%d", mtu); putenv (env);
66 putenv (env);
67 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", 66 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
68 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, 67 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
69 THISNODE->id & 0xff); 68 THISNODE->id & 0xff);
70 putenv (env); 69 putenv (env);
71 70
… …
102 { 101 {
103 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); 102 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
104 exit (1); 103 exit (1);
105 } 104 }
106 105
107 ipv4_ev_watcher.start (ipv4_fd, POLLIN); 106 ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
108 } 107 }
109 108
110 udpv4_fd = -1; 109 udpv4_fd = -1;
111 110
112 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) 111 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
… …
140 { 139 {
141 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); 140 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
142 exit (1); 141 exit (1);
143 } 142 }
144 143
145 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 144 udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
146 } 145 }
147 146
148 icmpv4_fd = -1; 147 icmpv4_fd = -1;
149 148
150#if ENABLE_ICMP 149#if ENABLE_ICMP
… …
184 { 183 {
185 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); 184 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
186 exit (1); 185 exit (1);
187 } 186 }
188 187
189 icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); 188 icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
190 } 189 }
191#endif 190#endif
192 191
193 tcpv4_fd = -1; 192 tcpv4_fd = -1;
194 193
… …
220 { 219 {
221 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); 220 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
222 exit (1); 221 exit (1);
223 } 222 }
224 223
225 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); 224 tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
226 } 225 }
227#endif 226#endif
228 227
229 tap = new tap_device (); 228 tap = new tap_device ();
230 if (!tap) //D this, of course, never catches 229 if (!tap) //D this, of course, never catches
… …
233 exit (1); 232 exit (1);
234 } 233 }
235 234
236 run_script (run_script_cb (this, &vpn::script_if_up), true); 235 run_script (run_script_cb (this, &vpn::script_if_up), true);
237 236
238 tap_ev_watcher.start (tap->fd, POLLIN); 237 tap_ev_watcher.start (tap->fd, EVENT_READ);
239 238
240 reconnect_all (); 239 reconnect_all ();
241 240
242 return 0; 241 return 0;
243} 242}
… …
333 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 332 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
334#endif 333#endif
335 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 ());
336 335
337 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 }
338} 356}
339 357
340void 358void
341vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 359vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
342{ 360{
… …
359 connection *c = conns[src - 1]; 377 connection *c = conns[src - 1];
360 378
361 if (dst == 0) 379 if (dst == 0)
362 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), 380 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
363 c->conf->nodename, (const char *)rsi); 381 c->conf->nodename, (const char *)rsi);
364 else if (dst != 0 && dst != THISNODE->id) 382 else if (dst != THISNODE->id)
365 { 383 {
366 if (THISNODE->routerprio) 384 if (THISNODE->routerprio)
367 // the tos setting gets lost here. who cares. 385 // the tos setting gets lost here. who cares.
368 conns[dst - 1]->inject_vpn_packet (pkt); 386 conns[dst - 1]->inject_vpn_packet (pkt);
369 else 387 else
… …
378} 396}
379 397
380void 398void
381vpn::ipv4_ev (io_watcher &w, short revents) 399vpn::ipv4_ev (io_watcher &w, short revents)
382{ 400{
383 if (revents & (POLLIN | POLLERR)) 401 if (revents & EVENT_READ)
384 { 402 {
385 vpn_packet *pkt = new vpn_packet; 403 vpn_packet *pkt = new vpn_packet;
386 struct sockaddr_in sa; 404 struct sockaddr_in sa;
387 socklen_t sa_len = sizeof (sa); 405 socklen_t sa_len = sizeof (sa);
388 int len; 406 int len;
… …
407 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 425 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
408 } 426 }
409 427
410 delete pkt; 428 delete pkt;
411 } 429 }
412 else if (revents & POLLHUP)
413 {
414 // this cannot ;) happen on udp sockets
415 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
416 exit (1);
417 }
418 else 430 else
419 { 431 {
420 slog (L_ERR, 432 slog (L_ERR,
421 _("FATAL: unknown revents %08x in socket, terminating\n"), 433 _("FATAL: unknown revents %08x in socket, terminating\n"),
422 revents); 434 revents);
… …
426 438
427#if ENABLE_ICMP 439#if ENABLE_ICMP
428void 440void
429vpn::icmpv4_ev (io_watcher &w, short revents) 441vpn::icmpv4_ev (io_watcher &w, short revents)
430{ 442{
431 if (revents & (POLLIN | POLLERR)) 443 if (revents & EVENT_READ)
432 { 444 {
433 vpn_packet *pkt = new vpn_packet; 445 vpn_packet *pkt = new vpn_packet;
434 struct sockaddr_in sa; 446 struct sockaddr_in sa;
435 socklen_t sa_len = sizeof (sa); 447 socklen_t sa_len = sizeof (sa);
436 int len; 448 int len;
… …
461 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 473 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
462 } 474 }
463 475
464 delete pkt; 476 delete pkt;
465 } 477 }
466 else if (revents & POLLHUP)
467 {
468 // this cannot ;) happen on udp sockets
469 slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
470 exit (1);
471 }
472 else 478 else
473 { 479 {
474 slog (L_ERR, 480 slog (L_ERR,
475 _("FATAL: unknown revents %08x in socket, terminating\n"), 481 _("FATAL: unknown revents %08x in socket, terminating\n"),
476 revents); 482 revents);
… …
480#endif 486#endif
481 487
482void 488void
483vpn::udpv4_ev (io_watcher &w, short revents) 489vpn::udpv4_ev (io_watcher &w, short revents)
484{ 490{
485 if (revents & (POLLIN | POLLERR)) 491 if (revents & EVENT_READ)
486 { 492 {
487 vpn_packet *pkt = new vpn_packet; 493 vpn_packet *pkt = new vpn_packet;
488 struct sockaddr_in sa; 494 struct sockaddr_in sa;
489 socklen_t sa_len = sizeof (sa); 495 socklen_t sa_len = sizeof (sa);
490 int len; 496 int len;
… …
505 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));
506 } 512 }
507 513
508 delete pkt; 514 delete pkt;
509 } 515 }
510 else if (revents & POLLHUP)
511 {
512 // this cannot ;) happen on udp sockets
513 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
514 exit (1);
515 }
516 else 516 else
517 { 517 {
518 slog (L_ERR, 518 slog (L_ERR,
519 _("FATAL: unknown revents %08x in socket, terminating\n"), 519 _("FATAL: unknown revents %08x in socket, terminating\n"),
520 revents); 520 revents);
… …
523} 523}
524 524
525void 525void
526vpn::tap_ev (io_watcher &w, short revents) 526vpn::tap_ev (io_watcher &w, short revents)
527{ 527{
528 if (revents & POLLIN) 528 if (revents & EVENT_READ)
529 { 529 {
530 /* process data */ 530 /* process data */
531 tap_packet *pkt; 531 tap_packet *pkt;
532 532
533 pkt = tap->recv (); 533 pkt = tap->recv ();
534 534
535 if (!pkt)
536 return;
537
538 if (pkt->len > 14)
539 {
535 int dst = mac2id (pkt->dst); 540 int dst = mac2id (pkt->dst);
536 int src = mac2id (pkt->src); 541 int src = mac2id (pkt->src);
537 542
538 if (src != THISNODE->id) 543 if (src != THISNODE->id)
539 {
540 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
541 exit (1);
542 }
543
544 if (dst == THISNODE->id)
545 {
546 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
547 exit (1);
548 }
549
550 if (dst > conns.size ())
551 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
552 else
553 {
554 if (dst)
555 { 544 {
556 // unicast 545 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
557 if (dst != THISNODE->id) 546 exit (1);
558 conns[dst - 1]->inject_data_packet (pkt);
559 } 547 }
548
549 if (dst == THISNODE->id)
550 {
551 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
552 exit (1);
553 }
554
555 if (dst > conns.size ())
556 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
560 else 557 else
561 {
562 // broadcast, this is ugly, but due to the security policy
563 // we have to connect to all hosts...
564 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
565 if ((*c)->conf != THISNODE)
566 (*c)->inject_data_packet (pkt); 558 inject_data_packet (pkt, dst);
567 }
568 } 559 }
569 560
570 delete pkt; 561 delete pkt;
571 }
572 else if (revents & (POLLHUP | POLLERR))
573 {
574 slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
575 exit (1);
576 } 562 }
577 else 563 else
578 abort (); 564 abort ();
579} 565}
580 566
… …
586 if (events & EVENT_SHUTDOWN) 572 if (events & EVENT_SHUTDOWN)
587 { 573 {
588 slog (L_INFO, _("preparing shutdown...")); 574 slog (L_INFO, _("preparing shutdown..."));
589 575
590 shutdown_all (); 576 shutdown_all ();
591
592 remove_pid (pidfilename); 577 remove_pid (pidfilename);
593
594 slog (L_INFO, _("terminating")); 578 slog (L_INFO, _("terminating"));
595
596 exit (0); 579 exit (0);
597 } 580 }
598 581
599 if (events & EVENT_RECONNECT) 582 if (events & EVENT_RECONNECT)
600 { 583 {
… …
603 reconnect_all (); 586 reconnect_all ();
604 } 587 }
605 588
606 events = 0; 589 events = 0;
607 } 590 }
608
609 w.at = TSTAMP_CANCEL;
610} 591}
611 592
612void 593void
613vpn::shutdown_all () 594vpn::shutdown_all ()
614{ 595{

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