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Comparing gvpe/src/vpn.C (file contents):
Revision 1.19 by pcg, Thu Oct 16 02:41:21 2003 UTC vs.
Revision 1.32 by pcg, Mon Mar 7 01:31:26 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>
… …
40 42
41#include "connection.h" 43#include "connection.h"
42#include "util.h" 44#include "util.h"
43#include "vpn.h" 45#include "vpn.h"
44 46
47vpn network; // THE vpn (bad design...)
48
45///////////////////////////////////////////////////////////////////////////// 49/////////////////////////////////////////////////////////////////////////////
46 50
47const char *vpn::script_if_up () 51const char *vpn::script_if_up ()
48{ 52{
49 // the tunnel device mtu should be the physical mtu - overhead 53 // the tunnel device mtu should be the physical mtu - overhead
… …
52 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion 56 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
53 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round 57 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
54 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again 58 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
55 59
56 char *env; 60 char *env;
57 asprintf (&env, "CONFBASE=%s", confbase); 61 asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
58 putenv (env);
59 asprintf (&env, "NODENAME=%s", THISNODE->nodename); 62 asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
60 putenv (env);
61 asprintf (&env, "NODEID=%d", THISNODE->id); 63 asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
62 putenv (env);
63 asprintf (&env, "IFNAME=%s", tap->interface ()); 64 asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
64 putenv (env); 65 asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
66 asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65 asprintf (&env, "MTU=%d", mtu); 67 asprintf (&env, "MTU=%d", mtu); putenv (env);
66 putenv (env);
67 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", 68 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
68 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, 69 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
69 THISNODE->id & 0xff); 70 THISNODE->id & 0xff);
70 putenv (env); 71 putenv (env);
71 72
… …
99 sockinfo si (THISNODE, PROT_IPv4); 100 sockinfo si (THISNODE, PROT_IPv4);
100 101
101 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) 102 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102 { 103 {
103 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));
104 exit (1); 105 exit (EXIT_FAILURE);
105 } 106 }
106 107
107 ipv4_ev_watcher.start (ipv4_fd, POLLIN); 108 ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
108 } 109 }
109 110
110 udpv4_fd = -1; 111 udpv4_fd = -1;
111 112
112 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) 113 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
… …
137 sockinfo si (THISNODE, PROT_UDPv4); 138 sockinfo si (THISNODE, PROT_UDPv4);
138 139
139 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 140 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140 { 141 {
141 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));
142 exit (1); 143 exit (EXIT_FAILURE);
143 } 144 }
144 145
145 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 146 udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
146 } 147 }
147 148
148 icmpv4_fd = -1; 149 icmpv4_fd = -1;
149 150
150#if ENABLE_ICMP 151#if ENABLE_ICMP
… …
181 sockinfo si (THISNODE, PROT_ICMPv4); 182 sockinfo si (THISNODE, PROT_ICMPv4);
182 183
183 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) 184 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184 { 185 {
185 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));
186 exit (1); 187 exit (EXIT_FAILURE);
187 } 188 }
188 189
189 icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); 190 icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
190 } 191 }
191#endif 192#endif
192 193
193 tcpv4_fd = -1; 194 tcpv4_fd = -1;
194 195
… …
211 sockinfo si (THISNODE, PROT_TCPv4); 212 sockinfo si (THISNODE, PROT_TCPv4);
212 213
213 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) 214 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214 { 215 {
215 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));
216 exit (1); 217 exit (EXIT_FAILURE);
217 } 218 }
218 219
219 if (listen (tcpv4_fd, 5)) 220 if (listen (tcpv4_fd, 5))
220 { 221 {
221 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));
222 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#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
241 // this I really consider a linux bug. I am neither connected
242 // nor do I fragment myself. Linux still sets DF and doesn't
243 // fragment for me sometimes.
244 {
245 int oval = IP_PMTUDISC_DONT;
246 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
247 }
248#endif
249
250 // standard daemon practise...
251 {
252 int oval = 1;
253 setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
254 }
255
256 sockinfo si (THISNODE->dns_hostname,
257 THISNODE->dns_hostname ? THISNODE->dns_port : 0,
258 PROT_DNSv4);
259
260 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
223 } 261 {
262 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
263 exit (EXIT_FAILURE);
264 }
224 265
225 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); 266 dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
226 } 267 }
227#endif 268#endif
228 269
229 tap = new tap_device (); 270 tap = new tap_device ();
230 if (!tap) //D this, of course, never catches 271 if (!tap) //D this, of course, never catches
231 { 272 {
232 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); 273 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
233 exit (1); 274 exit (EXIT_FAILURE);
234 } 275 }
235 276
236 run_script (run_script_cb (this, &vpn::script_if_up), true); 277 run_script (run_script_cb (this, &vpn::script_if_up), true);
237 278
238 tap_ev_watcher.start (tap->fd, POLLIN); 279 tap_ev_watcher.start (tap->fd, EVENT_READ);
239 280
240 reconnect_all (); 281 reconnect_all ();
241 282
242 return 0; 283 return 0;
243}
244
245// send a vpn packet out to other hosts
246bool
247vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
248{
249 switch (si.prot)
250 {
251 case PROT_IPv4:
252 return send_ipv4_packet (pkt, si, tos);
253
254 case PROT_UDPv4:
255 return send_udpv4_packet (pkt, si, tos);
256
257#if ENABLE_TCP
258 case PROT_TCPv4:
259 return send_tcpv4_packet (pkt, si, tos);
260#endif
261
262#if ENABLE_ICMP
263 case PROT_ICMPv4:
264 return send_icmpv4_packet (pkt, si, tos);
265#endif
266
267 default:
268 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
269 return false;
270 }
271} 284}
272 285
273bool 286bool
274vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 287vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275{ 288{
… …
394 else 407 else
395 c->recv_vpn_packet (pkt, rsi); 408 c->recv_vpn_packet (pkt, rsi);
396 } 409 }
397} 410}
398 411
412bool
413vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
414{
415 switch (si.prot)
416 {
417 case PROT_IPv4:
418 return send_ipv4_packet (pkt, si, tos);
419 case PROT_UDPv4:
420 return send_udpv4_packet (pkt, si, tos);
421#if ENABLE_TCP
422 case PROT_TCPv4:
423 return send_tcpv4_packet (pkt, si, tos);
424#endif
425#if ENABLE_ICMP
426 case PROT_ICMPv4:
427 return send_icmpv4_packet (pkt, si, tos);
428#endif
429#if ENABLE_DNS
430 case PROT_DNSv4:
431 return send_dnsv4_packet (pkt, si, tos);
432#endif
433
434 default:
435 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
436 }
437
438 return false;
439}
440
399void 441void
400vpn::ipv4_ev (io_watcher &w, short revents) 442vpn::ipv4_ev (io_watcher &w, short revents)
401{ 443{
402 if (revents & (POLLIN | POLLERR)) 444 if (revents & EVENT_READ)
403 { 445 {
404 vpn_packet *pkt = new vpn_packet; 446 vpn_packet *pkt = new vpn_packet;
405 struct sockaddr_in sa; 447 struct sockaddr_in sa;
406 socklen_t sa_len = sizeof (sa); 448 socklen_t sa_len = sizeof (sa);
407 int len; 449 int len;
… …
412 454
413 if (len > 0) 455 if (len > 0)
414 { 456 {
415 pkt->len = len; 457 pkt->len = len;
416 458
417 // raw sockets deliver the ipv4, but don't expect it on sends 459 // raw sockets deliver the ipv4 header, but don't expect it on sends
418 // this is slow, but...
419 pkt->skip_hdr (IP_OVERHEAD); 460 pkt->skip_hdr (IP_OVERHEAD);
420 461
421 recv_vpn_packet (pkt, si); 462 recv_vpn_packet (pkt, si);
422 } 463 }
423 else 464 else
… …
426 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 467 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
427 } 468 }
428 469
429 delete pkt; 470 delete pkt;
430 } 471 }
431 else if (revents & POLLHUP)
432 {
433 // this cannot ;) happen on udp sockets
434 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
435 exit (1);
436 }
437 else 472 else
438 { 473 {
439 slog (L_ERR, 474 slog (L_ERR,
440 _("FATAL: unknown revents %08x in socket, terminating\n"), 475 _("FATAL: unknown revents %08x in socket, terminating\n"),
441 revents); 476 revents);
442 exit (1); 477 exit (EXIT_FAILURE);
443 } 478 }
444} 479}
445 480
446#if ENABLE_ICMP 481#if ENABLE_ICMP
447void 482void
448vpn::icmpv4_ev (io_watcher &w, short revents) 483vpn::icmpv4_ev (io_watcher &w, short revents)
449{ 484{
450 if (revents & (POLLIN | POLLERR)) 485 if (revents & EVENT_READ)
451 { 486 {
452 vpn_packet *pkt = new vpn_packet; 487 vpn_packet *pkt = new vpn_packet;
453 struct sockaddr_in sa; 488 struct sockaddr_in sa;
454 socklen_t sa_len = sizeof (sa); 489 socklen_t sa_len = sizeof (sa);
455 int len; 490 int len;
… …
480 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 515 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
481 } 516 }
482 517
483 delete pkt; 518 delete pkt;
484 } 519 }
485 else if (revents & POLLHUP)
486 {
487 // this cannot ;) happen on udp sockets
488 slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
489 exit (1);
490 }
491 else 520 else
492 { 521 {
493 slog (L_ERR, 522 slog (L_ERR,
494 _("FATAL: unknown revents %08x in socket, terminating\n"), 523 _("FATAL: unknown revents %08x in socket, terminating\n"),
495 revents); 524 revents);
496 exit (1); 525 exit (EXIT_FAILURE);
497 } 526 }
498} 527}
499#endif 528#endif
500 529
501void 530void
502vpn::udpv4_ev (io_watcher &w, short revents) 531vpn::udpv4_ev (io_watcher &w, short revents)
503{ 532{
504 if (revents & (POLLIN | POLLERR)) 533 if (revents & EVENT_READ)
505 { 534 {
506 vpn_packet *pkt = new vpn_packet; 535 vpn_packet *pkt = new vpn_packet;
507 struct sockaddr_in sa; 536 struct sockaddr_in sa;
508 socklen_t sa_len = sizeof (sa); 537 socklen_t sa_len = sizeof (sa);
509 int len; 538 int len;
… …
524 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); 553 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
525 } 554 }
526 555
527 delete pkt; 556 delete pkt;
528 } 557 }
529 else if (revents & POLLHUP)
530 {
531 // this cannot ;) happen on udp sockets
532 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
533 exit (1);
534 }
535 else 558 else
536 { 559 {
537 slog (L_ERR, 560 slog (L_ERR,
538 _("FATAL: unknown revents %08x in socket, terminating\n"), 561 _("FATAL: unknown revents %08x in socket, terminating\n"),
539 revents); 562 revents);
540 exit (1); 563 exit (EXIT_FAILURE);
541 } 564 }
542} 565}
543 566
544void 567void
545vpn::tap_ev (io_watcher &w, short revents) 568vpn::tap_ev (io_watcher &w, short revents)
546{ 569{
547 if (revents & POLLIN) 570 if (revents & EVENT_READ)
548 { 571 {
549 /* process data */ 572 /* process data */
550 tap_packet *pkt; 573 tap_packet *pkt;
551 574
552 pkt = tap->recv (); 575 pkt = tap->recv ();
… …
559 int dst = mac2id (pkt->dst); 582 int dst = mac2id (pkt->dst);
560 int src = mac2id (pkt->src); 583 int src = mac2id (pkt->src);
561 584
562 if (src != THISNODE->id) 585 if (src != THISNODE->id)
563 { 586 {
564 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); 587 slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
565 exit (1); 588 exit (EXIT_FAILURE);
566 } 589 }
567 590
568 if (dst == THISNODE->id) 591 if (dst == THISNODE->id)
569 { 592 {
570 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); 593 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
571 exit (1); 594 exit (EXIT_FAILURE);
572 } 595 }
573 596
574 if (dst > conns.size ()) 597 if (dst > conns.size ())
575 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); 598 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
576 else 599 else
577 inject_data_packet (pkt, dst); 600 inject_data_packet (pkt, dst);
578 } 601 }
579 602
580 delete pkt; 603 delete pkt;
581 } 604 }
582 else if (revents & (POLLHUP | POLLERR))
583 {
584 slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
585 exit (1);
586 }
587 else 605 else
588 abort (); 606 abort ();
589} 607}
590 608
591void 609void
… …
596 if (events & EVENT_SHUTDOWN) 614 if (events & EVENT_SHUTDOWN)
597 { 615 {
598 slog (L_INFO, _("preparing shutdown...")); 616 slog (L_INFO, _("preparing shutdown..."));
599 617
600 shutdown_all (); 618 shutdown_all ();
601
602 remove_pid (pidfilename); 619 remove_pid (conf.pidfilename);
603
604 slog (L_INFO, _("terminating")); 620 slog (L_INFO, _("terminating"));
605 621 exit (EXIT_SUCCESS);
606 exit (0);
607 } 622 }
608 623
609 if (events & EVENT_RECONNECT) 624 if (events & EVENT_RECONNECT)
610 { 625 {
611 slog (L_INFO, _("forced reconnect")); 626 slog (L_INFO, _("forced reconnect"));
… …
613 reconnect_all (); 628 reconnect_all ();
614 } 629 }
615 630
616 events = 0; 631 events = 0;
617 } 632 }
618
619 w.at = TSTAMP_CANCEL;
620} 633}
621 634
622void 635void
623vpn::shutdown_all () 636vpn::shutdown_all ()
624{ 637{
… …
637 connection_init (); 650 connection_init ();
638 651
639 for (configuration::node_vector::iterator i = conf.nodes.begin (); 652 for (configuration::node_vector::iterator i = conf.nodes.begin ();
640 i != conf.nodes.end (); ++i) 653 i != conf.nodes.end (); ++i)
641 { 654 {
642 connection *conn = new connection (this); 655 connection *conn = new connection (this, *i);
643
644 conn->conf = *i;
645 conns.push_back (conn); 656 conns.push_back (conn);
646
647 conn->establish_connection (); 657 conn->establish_connection ();
648 } 658 }
649} 659}
650 660
651connection *vpn::find_router () 661connection *vpn::find_router ()
… …
714, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) 724, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
715#endif 725#endif
716#if ENABLE_ICMP 726#if ENABLE_ICMP
717, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) 727, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
718#endif 728#endif
729#if ENABLE_DNS
730, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
731#endif
719, tap_ev_watcher (this, &vpn::tap_ev) 732, tap_ev_watcher (this, &vpn::tap_ev)
720{ 733{
721} 734}
722 735
723vpn::~vpn () 736vpn::~vpn ()

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