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Comparing gvpe/src/vpn.C (file contents):
Revision 1.21 by pcg, Thu Oct 16 21:57:54 2003 UTC vs.
Revision 1.30 by pcg, Fri Mar 4 20:26:50 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 Marc Lehmann <pcg@goof.com> 3 Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
4 4
5 This file is part of GVPE.
6
5 This program is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify
6 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
7 the Free Software Foundation; either version 2 of the License, or 9 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version. 10 (at your option) any later version.
9 11
10 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,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details. 15 GNU General Public License for more details.
14 16
15 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
16 along with this program; if not, write to the Free Software 18 along with gvpe; if not, write to the Free Software
17 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
18*/ 20*/
19 21
20#include "config.h" 22#include "config.h"
21 23
22#include <list> 24#include <list>
23 25
26#include <cstdio>
27#include <cstring>
24#include <cstdlib> 28#include <cstdlib>
25#include <cstring>
26#include <cstdio>
27 29
28#include <sys/types.h> 30#include <sys/types.h>
29#include <sys/socket.h> 31#include <sys/socket.h>
30#include <sys/wait.h> 32#include <sys/wait.h>
31#include <errno.h> 33#include <errno.h>
… …
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 dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
234
235 dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
236
237 if (dnsv4_fd < 0)
238 return -1;
239
240 // standard daemon practise...
241 {
242 int oval = 1;
243 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
244 }
245
246 sockinfo si (THISNODE, PROT_DNSv4);
247
248 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
222 } 249 {
250 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
251 exit (EXIT_FAILURE);
252 }
223 253
224 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); 254 dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
225 } 255 }
226#endif 256#endif
227 257
228 tap = new tap_device (); 258 tap = new tap_device ();
229 if (!tap) //D this, of course, never catches 259 if (!tap) //D this, of course, never catches
230 { 260 {
231 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); 261 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
232 exit (1); 262 exit (EXIT_FAILURE);
233 } 263 }
234 264
235 run_script (run_script_cb (this, &vpn::script_if_up), true); 265 run_script (run_script_cb (this, &vpn::script_if_up), true);
236 266
237 tap_ev_watcher.start (tap->fd, POLLIN); 267 tap_ev_watcher.start (tap->fd, EVENT_READ);
238 268
239 reconnect_all (); 269 reconnect_all ();
240 270
241 return 0; 271 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} 272}
271 273
272bool 274bool
273vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 275vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
274{ 276{
… …
396} 398}
397 399
398void 400void
399vpn::ipv4_ev (io_watcher &w, short revents) 401vpn::ipv4_ev (io_watcher &w, short revents)
400{ 402{
401 if (revents & (POLLIN | POLLERR)) 403 if (revents & EVENT_READ)
402 { 404 {
403 vpn_packet *pkt = new vpn_packet; 405 vpn_packet *pkt = new vpn_packet;
404 struct sockaddr_in sa; 406 struct sockaddr_in sa;
405 socklen_t sa_len = sizeof (sa); 407 socklen_t sa_len = sizeof (sa);
406 int len; 408 int len;
… …
411 413
412 if (len > 0) 414 if (len > 0)
413 { 415 {
414 pkt->len = len; 416 pkt->len = len;
415 417
416 // raw sockets deliver the ipv4, but don't expect it on sends 418 // raw sockets deliver the ipv4 header, but don't expect it on sends
417 // this is slow, but...
418 pkt->skip_hdr (IP_OVERHEAD); 419 pkt->skip_hdr (IP_OVERHEAD);
419 420
420 recv_vpn_packet (pkt, si); 421 recv_vpn_packet (pkt, si);
421 } 422 }
422 else 423 else
… …
425 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 426 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
426 } 427 }
427 428
428 delete pkt; 429 delete pkt;
429 } 430 }
430 else if (revents & POLLHUP)
431 {
432 // this cannot ;) happen on udp sockets
433 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
434 exit (1);
435 }
436 else 431 else
437 { 432 {
438 slog (L_ERR, 433 slog (L_ERR,
439 _("FATAL: unknown revents %08x in socket, terminating\n"), 434 _("FATAL: unknown revents %08x in socket, terminating\n"),
440 revents); 435 revents);
441 exit (1); 436 exit (EXIT_FAILURE);
442 } 437 }
443} 438}
444 439
445#if ENABLE_ICMP 440#if ENABLE_ICMP
446void 441void
447vpn::icmpv4_ev (io_watcher &w, short revents) 442vpn::icmpv4_ev (io_watcher &w, short revents)
448{ 443{
449 if (revents & (POLLIN | POLLERR)) 444 if (revents & EVENT_READ)
450 { 445 {
451 vpn_packet *pkt = new vpn_packet; 446 vpn_packet *pkt = new vpn_packet;
452 struct sockaddr_in sa; 447 struct sockaddr_in sa;
453 socklen_t sa_len = sizeof (sa); 448 socklen_t sa_len = sizeof (sa);
454 int len; 449 int len;
… …
479 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 474 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
480 } 475 }
481 476
482 delete pkt; 477 delete pkt;
483 } 478 }
484 else if (revents & POLLHUP)
485 {
486 // this cannot ;) happen on udp sockets
487 slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
488 exit (1);
489 }
490 else 479 else
491 { 480 {
492 slog (L_ERR, 481 slog (L_ERR,
493 _("FATAL: unknown revents %08x in socket, terminating\n"), 482 _("FATAL: unknown revents %08x in socket, terminating\n"),
494 revents); 483 revents);
495 exit (1); 484 exit (EXIT_FAILURE);
496 } 485 }
497} 486}
498#endif 487#endif
499 488
500void 489void
501vpn::udpv4_ev (io_watcher &w, short revents) 490vpn::udpv4_ev (io_watcher &w, short revents)
502{ 491{
503 if (revents & (POLLIN | POLLERR)) 492 if (revents & EVENT_READ)
504 { 493 {
505 vpn_packet *pkt = new vpn_packet; 494 vpn_packet *pkt = new vpn_packet;
506 struct sockaddr_in sa; 495 struct sockaddr_in sa;
507 socklen_t sa_len = sizeof (sa); 496 socklen_t sa_len = sizeof (sa);
508 int len; 497 int len;
… …
523 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); 512 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
524 } 513 }
525 514
526 delete pkt; 515 delete pkt;
527 } 516 }
528 else if (revents & POLLHUP)
529 {
530 // this cannot ;) happen on udp sockets
531 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
532 exit (1);
533 }
534 else 517 else
535 { 518 {
536 slog (L_ERR, 519 slog (L_ERR,
537 _("FATAL: unknown revents %08x in socket, terminating\n"), 520 _("FATAL: unknown revents %08x in socket, terminating\n"),
538 revents); 521 revents);
539 exit (1); 522 exit (EXIT_FAILURE);
540 } 523 }
541} 524}
542 525
543void 526void
544vpn::tap_ev (io_watcher &w, short revents) 527vpn::tap_ev (io_watcher &w, short revents)
545{ 528{
546 if (revents & POLLIN) 529 if (revents & EVENT_READ)
547 { 530 {
548 /* process data */ 531 /* process data */
549 tap_packet *pkt; 532 tap_packet *pkt;
550 533
551 pkt = tap->recv (); 534 pkt = tap->recv ();
… …
558 int dst = mac2id (pkt->dst); 541 int dst = mac2id (pkt->dst);
559 int src = mac2id (pkt->src); 542 int src = mac2id (pkt->src);
560 543
561 if (src != THISNODE->id) 544 if (src != THISNODE->id)
562 { 545 {
563 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); 546 slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
564 exit (1); 547 exit (EXIT_FAILURE);
565 } 548 }
566 549
567 if (dst == THISNODE->id) 550 if (dst == THISNODE->id)
568 { 551 {
569 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); 552 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
570 exit (1); 553 exit (EXIT_FAILURE);
571 } 554 }
572 555
573 if (dst > conns.size ()) 556 if (dst > conns.size ())
574 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); 557 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
575 else 558 else
576 inject_data_packet (pkt, dst); 559 inject_data_packet (pkt, dst);
577 } 560 }
578 561
579 delete pkt; 562 delete pkt;
580 } 563 }
581 else if (revents & (POLLHUP | POLLERR))
582 {
583 slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
584 exit (1);
585 }
586 else 564 else
587 abort (); 565 abort ();
588} 566}
589 567
590void 568void
… …
595 if (events & EVENT_SHUTDOWN) 573 if (events & EVENT_SHUTDOWN)
596 { 574 {
597 slog (L_INFO, _("preparing shutdown...")); 575 slog (L_INFO, _("preparing shutdown..."));
598 576
599 shutdown_all (); 577 shutdown_all ();
600
601 remove_pid (pidfilename); 578 remove_pid (conf.pidfilename);
602
603 slog (L_INFO, _("terminating")); 579 slog (L_INFO, _("terminating"));
604 580 exit (EXIT_SUCCESS);
605 exit (0);
606 } 581 }
607 582
608 if (events & EVENT_RECONNECT) 583 if (events & EVENT_RECONNECT)
609 { 584 {
610 slog (L_INFO, _("forced reconnect")); 585 slog (L_INFO, _("forced reconnect"));
… …
612 reconnect_all (); 587 reconnect_all ();
613 } 588 }
614 589
615 events = 0; 590 events = 0;
616 } 591 }
617
618 w.at = TSTAMP_CANCEL;
619} 592}
620 593
621void 594void
622vpn::shutdown_all () 595vpn::shutdown_all ()
623{ 596{
… …
636 connection_init (); 609 connection_init ();
637 610
638 for (configuration::node_vector::iterator i = conf.nodes.begin (); 611 for (configuration::node_vector::iterator i = conf.nodes.begin ();
639 i != conf.nodes.end (); ++i) 612 i != conf.nodes.end (); ++i)
640 { 613 {
641 connection *conn = new connection (this); 614 connection *conn = new connection (this, *i);
642
643 conn->conf = *i;
644 conns.push_back (conn); 615 conns.push_back (conn);
645
646 conn->establish_connection (); 616 conn->establish_connection ();
647 } 617 }
648} 618}
649 619
650connection *vpn::find_router () 620connection *vpn::find_router ()
… …
713, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) 683, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
714#endif 684#endif
715#if ENABLE_ICMP 685#if ENABLE_ICMP
716, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) 686, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
717#endif 687#endif
688#if ENABLE_DNS
689, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
690#endif
718, tap_ev_watcher (this, &vpn::tap_ev) 691, tap_ev_watcher (this, &vpn::tap_ev)
719{ 692{
720} 693}
721 694
722vpn::~vpn () 695vpn::~vpn ()

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