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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 1.25 by pcg, Sun Jul 25 18:11:40 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.
… …
18 19
19#include "config.h" 20#include "config.h"
20 21
21#include <list> 22#include <list>
22 23
24#include <cstdio>
25#include <cstring>
23#include <cstdlib> 26#include <cstdlib>
24#include <cstring>
25#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/wait.h> 30#include <sys/wait.h>
30#include <errno.h> 31#include <errno.h>
… …
39 40
40#include "connection.h" 41#include "connection.h"
41#include "util.h" 42#include "util.h"
42#include "vpn.h" 43#include "vpn.h"
43 44
45vpn network; // THE vpn (bad design...)
46
44///////////////////////////////////////////////////////////////////////////// 47/////////////////////////////////////////////////////////////////////////////
45 48
46const char *vpn::script_if_up () 49const char *vpn::script_if_up ()
47{ 50{
48 // the tunnel device mtu should be the physical mtu - overhead 51 // the tunnel device mtu should be the physical mtu - overhead
… …
51 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion 54 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
52 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round 55 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
53 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again 56 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
54 57
55 char *env; 58 char *env;
56 asprintf (&env, "CONFBASE=%s", confbase); 59 asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
57 putenv (env);
58 asprintf (&env, "NODENAME=%s", THISNODE->nodename); 60 asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
59 putenv (env);
60 asprintf (&env, "NODEID=%d", THISNODE->id); 61 asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
61 putenv (env);
62 asprintf (&env, "IFNAME=%s", tap->interface ()); 62 asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63 putenv (env); 63 asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
64 asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
64 asprintf (&env, "MTU=%d", mtu); 65 asprintf (&env, "MTU=%d", mtu); putenv (env);
65 putenv (env);
66 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", 66 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
67 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, 67 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
68 THISNODE->id & 0xff); 68 THISNODE->id & 0xff);
69 putenv (env); 69 putenv (env);
70 70
… …
98 sockinfo si (THISNODE, PROT_IPv4); 98 sockinfo si (THISNODE, PROT_IPv4);
99 99
100 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) 100 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
101 { 101 {
102 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));
103 exit (1); 103 exit (EXIT_FAILURE);
104 } 104 }
105 105
106 ipv4_ev_watcher.start (ipv4_fd, POLLIN); 106 ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
107 } 107 }
108 108
109 udpv4_fd = -1; 109 udpv4_fd = -1;
110 110
111 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) 111 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
… …
136 sockinfo si (THISNODE, PROT_UDPv4); 136 sockinfo si (THISNODE, PROT_UDPv4);
137 137
138 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 138 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
139 { 139 {
140 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));
141 exit (1); 141 exit (EXIT_FAILURE);
142 } 142 }
143 143
144 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 144 udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
145 } 145 }
146 146
147 icmpv4_fd = -1; 147 icmpv4_fd = -1;
148 148
149#if ENABLE_ICMP 149#if ENABLE_ICMP
… …
180 sockinfo si (THISNODE, PROT_ICMPv4); 180 sockinfo si (THISNODE, PROT_ICMPv4);
181 181
182 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) 182 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
183 { 183 {
184 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));
185 exit (1); 185 exit (EXIT_FAILURE);
186 } 186 }
187 187
188 icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); 188 icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
189 } 189 }
190#endif 190#endif
191 191
192 tcpv4_fd = -1; 192 tcpv4_fd = -1;
193 193
… …
210 sockinfo si (THISNODE, PROT_TCPv4); 210 sockinfo si (THISNODE, PROT_TCPv4);
211 211
212 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) 212 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
213 { 213 {
214 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); 214 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
215 exit (1); 215 exit (EXIT_FAILURE);
216 } 216 }
217 217
218 if (listen (tcpv4_fd, 5)) 218 if (listen (tcpv4_fd, 5))
219 { 219 {
220 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));
221 exit (1); 221 exit (EXIT_FAILURE);
222 }
223
224 tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
225 }
226#endif
227
228#if ENABLE_DNS
229 if (THISNODE->protocols & PROT_DNSv4)
230 {
231 dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
232
233 if (dnsv4_fd < 0)
234 return -1;
235
236 // standard daemon practise...
237 {
238 int oval = 1;
239 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
240 }
241
242 sockinfo si (THISNODE, PROT_DNSv4);
243
244 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
222 } 245 {
246 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
247 exit (EXIT_FAILURE);
248 }
223 249
224 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); 250 dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
225 } 251 }
226#endif 252#endif
227 253
228 tap = new tap_device (); 254 tap = new tap_device ();
229 if (!tap) //D this, of course, never catches 255 if (!tap) //D this, of course, never catches
230 { 256 {
231 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); 257 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
232 exit (1); 258 exit (EXIT_FAILURE);
233 } 259 }
234 260
235 run_script (run_script_cb (this, &vpn::script_if_up), true); 261 run_script (run_script_cb (this, &vpn::script_if_up), true);
236 262
237 tap_ev_watcher.start (tap->fd, POLLIN); 263 tap_ev_watcher.start (tap->fd, EVENT_READ);
238 264
239 reconnect_all (); 265 reconnect_all ();
240 266
241 return 0; 267 return 0;
242} 268}
… …
259#endif 285#endif
260 286
261#if ENABLE_ICMP 287#if ENABLE_ICMP
262 case PROT_ICMPv4: 288 case PROT_ICMPv4:
263 return send_icmpv4_packet (pkt, si, tos); 289 return send_icmpv4_packet (pkt, si, tos);
290#endif
291
292#if ENABLE_DNS
293 case PROT_DNSv4:
294 return send_dnsv4_packet (pkt, si, tos);
264#endif 295#endif
265 296
266 default: 297 default:
267 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); 298 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
268 return false; 299 return false;
… …
332 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 363 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
333#endif 364#endif
334 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 365 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
335 366
336 return true; 367 return true;
368}
369
370void
371vpn::inject_data_packet (tap_packet *pkt, int dst)
372{
373 if (dst)
374 {
375 // unicast
376 if (dst != THISNODE->id)
377 conns[dst - 1]->inject_data_packet (pkt);
378 }
379 else
380 {
381 // broadcast, this is ugly, but due to the security policy
382 // we have to connect to all hosts...
383 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
384 if ((*c)->conf != THISNODE)
385 (*c)->inject_data_packet (pkt, true);
386 }
337} 387}
338 388
339void 389void
340vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 390vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
341{ 391{
… …
358 connection *c = conns[src - 1]; 408 connection *c = conns[src - 1];
359 409
360 if (dst == 0) 410 if (dst == 0)
361 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), 411 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
362 c->conf->nodename, (const char *)rsi); 412 c->conf->nodename, (const char *)rsi);
363 else if (dst != 0 && dst != THISNODE->id) 413 else if (dst != THISNODE->id)
364 { 414 {
365 if (THISNODE->routerprio) 415 if (THISNODE->routerprio)
366 // the tos setting gets lost here. who cares. 416 // the tos setting gets lost here. who cares.
367 conns[dst - 1]->inject_vpn_packet (pkt); 417 conns[dst - 1]->inject_vpn_packet (pkt);
368 else 418 else
… …
377} 427}
378 428
379void 429void
380vpn::ipv4_ev (io_watcher &w, short revents) 430vpn::ipv4_ev (io_watcher &w, short revents)
381{ 431{
382 if (revents & (POLLIN | POLLERR)) 432 if (revents & EVENT_READ)
383 { 433 {
384 vpn_packet *pkt = new vpn_packet; 434 vpn_packet *pkt = new vpn_packet;
385 struct sockaddr_in sa; 435 struct sockaddr_in sa;
386 socklen_t sa_len = sizeof (sa); 436 socklen_t sa_len = sizeof (sa);
387 int len; 437 int len;
… …
406 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 456 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
407 } 457 }
408 458
409 delete pkt; 459 delete pkt;
410 } 460 }
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 461 else
418 { 462 {
419 slog (L_ERR, 463 slog (L_ERR,
420 _("FATAL: unknown revents %08x in socket, terminating\n"), 464 _("FATAL: unknown revents %08x in socket, terminating\n"),
421 revents); 465 revents);
422 exit (1); 466 exit (EXIT_FAILURE);
423 } 467 }
424} 468}
425 469
426#if ENABLE_ICMP 470#if ENABLE_ICMP
427void 471void
428vpn::icmpv4_ev (io_watcher &w, short revents) 472vpn::icmpv4_ev (io_watcher &w, short revents)
429{ 473{
430 if (revents & (POLLIN | POLLERR)) 474 if (revents & EVENT_READ)
431 { 475 {
432 vpn_packet *pkt = new vpn_packet; 476 vpn_packet *pkt = new vpn_packet;
433 struct sockaddr_in sa; 477 struct sockaddr_in sa;
434 socklen_t sa_len = sizeof (sa); 478 socklen_t sa_len = sizeof (sa);
435 int len; 479 int len;
… …
460 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 504 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
461 } 505 }
462 506
463 delete pkt; 507 delete pkt;
464 } 508 }
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 509 else
472 { 510 {
473 slog (L_ERR, 511 slog (L_ERR,
474 _("FATAL: unknown revents %08x in socket, terminating\n"), 512 _("FATAL: unknown revents %08x in socket, terminating\n"),
475 revents); 513 revents);
476 exit (1); 514 exit (EXIT_FAILURE);
477 } 515 }
478} 516}
479#endif 517#endif
480 518
481void 519void
482vpn::udpv4_ev (io_watcher &w, short revents) 520vpn::udpv4_ev (io_watcher &w, short revents)
483{ 521{
484 if (revents & (POLLIN | POLLERR)) 522 if (revents & EVENT_READ)
485 { 523 {
486 vpn_packet *pkt = new vpn_packet; 524 vpn_packet *pkt = new vpn_packet;
487 struct sockaddr_in sa; 525 struct sockaddr_in sa;
488 socklen_t sa_len = sizeof (sa); 526 socklen_t sa_len = sizeof (sa);
489 int len; 527 int len;
… …
504 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); 542 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
505 } 543 }
506 544
507 delete pkt; 545 delete pkt;
508 } 546 }
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 547 else
516 { 548 {
517 slog (L_ERR, 549 slog (L_ERR,
518 _("FATAL: unknown revents %08x in socket, terminating\n"), 550 _("FATAL: unknown revents %08x in socket, terminating\n"),
519 revents); 551 revents);
520 exit (1); 552 exit (EXIT_FAILURE);
521 } 553 }
522} 554}
523 555
524void 556void
525vpn::tap_ev (io_watcher &w, short revents) 557vpn::tap_ev (io_watcher &w, short revents)
526{ 558{
527 if (revents & POLLIN) 559 if (revents & EVENT_READ)
528 { 560 {
529 /* process data */ 561 /* process data */
530 tap_packet *pkt; 562 tap_packet *pkt;
531 563
532 pkt = tap->recv (); 564 pkt = tap->recv ();
… …
540 int src = mac2id (pkt->src); 572 int src = mac2id (pkt->src);
541 573
542 if (src != THISNODE->id) 574 if (src != THISNODE->id)
543 { 575 {
544 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); 576 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
545 exit (1); 577 exit (EXIT_FAILURE);
546 } 578 }
547 579
548 if (dst == THISNODE->id) 580 if (dst == THISNODE->id)
549 { 581 {
550 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); 582 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
551 exit (1); 583 exit (EXIT_FAILURE);
552 } 584 }
553 585
554 if (dst > conns.size ()) 586 if (dst > conns.size ())
555 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); 587 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
556 else 588 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); 589 inject_data_packet (pkt, dst);
571 }
572 }
573 } 590 }
574 591
575 delete pkt; 592 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 } 593 }
582 else 594 else
583 abort (); 595 abort ();
584} 596}
585 597
… …
591 if (events & EVENT_SHUTDOWN) 603 if (events & EVENT_SHUTDOWN)
592 { 604 {
593 slog (L_INFO, _("preparing shutdown...")); 605 slog (L_INFO, _("preparing shutdown..."));
594 606
595 shutdown_all (); 607 shutdown_all ();
596
597 remove_pid (pidfilename); 608 remove_pid (conf.pidfilename);
598
599 slog (L_INFO, _("terminating")); 609 slog (L_INFO, _("terminating"));
600 610 exit (EXIT_SUCCESS);
601 exit (0);
602 } 611 }
603 612
604 if (events & EVENT_RECONNECT) 613 if (events & EVENT_RECONNECT)
605 { 614 {
606 slog (L_INFO, _("forced reconnect")); 615 slog (L_INFO, _("forced reconnect"));
… …
608 reconnect_all (); 617 reconnect_all ();
609 } 618 }
610 619
611 events = 0; 620 events = 0;
612 } 621 }
613
614 w.at = TSTAMP_CANCEL;
615} 622}
616 623
617void 624void
618vpn::shutdown_all () 625vpn::shutdown_all ()
619{ 626{
… …
643 } 650 }
644} 651}
645 652
646connection *vpn::find_router () 653connection *vpn::find_router ()
647{ 654{
648 u32 prio = 1; 655 u32 prio = 0;
649 connection *router = 0; 656 connection *router = 0;
650 657
651 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 658 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
652 { 659 {
653 connection *c = *i; 660 connection *c = *i;
… …
709, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) 716, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
710#endif 717#endif
711#if ENABLE_ICMP 718#if ENABLE_ICMP
712, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) 719, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
713#endif 720#endif
721#if ENABLE_DNS
722, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
723#endif
714, tap_ev_watcher (this, &vpn::tap_ev) 724, tap_ev_watcher (this, &vpn::tap_ev)
715{ 725{
716} 726}
717 727
718vpn::~vpn () 728vpn::~vpn ()

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