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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 1.27 by pcg, Tue Mar 1 06:27:20 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) 2003-2004 Marc Lehmann <pcg@goof.com>
4 4
5 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
6 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
7 the Free Software Foundation; either version 2 of the License, or 7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version. 8 (at your option) any later version.
… …
19 19
20#include "config.h" 20#include "config.h"
21 21
22#include <list> 22#include <list>
23 23
24#include <cstdio>
25#include <cstring>
24#include <cstdlib> 26#include <cstdlib>
25#include <cstring>
26#include <cstdio>
27 27
28#include <sys/types.h> 28#include <sys/types.h>
29#include <sys/socket.h> 29#include <sys/socket.h>
30#include <sys/wait.h> 30#include <sys/wait.h>
31#include <errno.h> 31#include <errno.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
… …
99 sockinfo si (THISNODE, PROT_IPv4); 98 sockinfo si (THISNODE, PROT_IPv4);
100 99
101 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) 100 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
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 (EXIT_FAILURE);
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)
… …
137 sockinfo si (THISNODE, PROT_UDPv4); 136 sockinfo si (THISNODE, PROT_UDPv4);
138 137
139 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 138 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
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 (EXIT_FAILURE);
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
… …
181 sockinfo si (THISNODE, PROT_ICMPv4); 180 sockinfo si (THISNODE, PROT_ICMPv4);
182 181
183 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) 182 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
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 (EXIT_FAILURE);
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
… …
211 sockinfo si (THISNODE, PROT_TCPv4); 210 sockinfo si (THISNODE, PROT_TCPv4);
212 211
213 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) 212 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214 { 213 {
215 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));
216 exit (1); 215 exit (EXIT_FAILURE);
217 } 216 }
218 217
219 if (listen (tcpv4_fd, 5)) 218 if (listen (tcpv4_fd, 5))
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 (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 ()))
223 } 245 {
246 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
247 exit (EXIT_FAILURE);
248 }
224 249
225 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); 250 dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
226 } 251 }
227#endif 252#endif
228 253
229 tap = new tap_device (); 254 tap = new tap_device ();
230 if (!tap) //D this, of course, never catches 255 if (!tap) //D this, of course, never catches
231 { 256 {
232 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); 257 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
233 exit (1); 258 exit (EXIT_FAILURE);
234 } 259 }
235 260
236 run_script (run_script_cb (this, &vpn::script_if_up), true); 261 run_script (run_script_cb (this, &vpn::script_if_up), true);
237 262
238 tap_ev_watcher.start (tap->fd, POLLIN); 263 tap_ev_watcher.start (tap->fd, EVENT_READ);
239 264
240 reconnect_all (); 265 reconnect_all ();
241 266
242 return 0; 267 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} 268}
272 269
273bool 270bool
274vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 271vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275{ 272{
… …
397} 394}
398 395
399void 396void
400vpn::ipv4_ev (io_watcher &w, short revents) 397vpn::ipv4_ev (io_watcher &w, short revents)
401{ 398{
402 if (revents & (POLLIN | POLLERR)) 399 if (revents & EVENT_READ)
403 { 400 {
404 vpn_packet *pkt = new vpn_packet; 401 vpn_packet *pkt = new vpn_packet;
405 struct sockaddr_in sa; 402 struct sockaddr_in sa;
406 socklen_t sa_len = sizeof (sa); 403 socklen_t sa_len = sizeof (sa);
407 int len; 404 int len;
… …
426 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 423 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
427 } 424 }
428 425
429 delete pkt; 426 delete pkt;
430 } 427 }
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 428 else
438 { 429 {
439 slog (L_ERR, 430 slog (L_ERR,
440 _("FATAL: unknown revents %08x in socket, terminating\n"), 431 _("FATAL: unknown revents %08x in socket, terminating\n"),
441 revents); 432 revents);
442 exit (1); 433 exit (EXIT_FAILURE);
443 } 434 }
444} 435}
445 436
446#if ENABLE_ICMP 437#if ENABLE_ICMP
447void 438void
448vpn::icmpv4_ev (io_watcher &w, short revents) 439vpn::icmpv4_ev (io_watcher &w, short revents)
449{ 440{
450 if (revents & (POLLIN | POLLERR)) 441 if (revents & EVENT_READ)
451 { 442 {
452 vpn_packet *pkt = new vpn_packet; 443 vpn_packet *pkt = new vpn_packet;
453 struct sockaddr_in sa; 444 struct sockaddr_in sa;
454 socklen_t sa_len = sizeof (sa); 445 socklen_t sa_len = sizeof (sa);
455 int len; 446 int len;
… …
480 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 471 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
481 } 472 }
482 473
483 delete pkt; 474 delete pkt;
484 } 475 }
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 476 else
492 { 477 {
493 slog (L_ERR, 478 slog (L_ERR,
494 _("FATAL: unknown revents %08x in socket, terminating\n"), 479 _("FATAL: unknown revents %08x in socket, terminating\n"),
495 revents); 480 revents);
496 exit (1); 481 exit (EXIT_FAILURE);
497 } 482 }
498} 483}
499#endif 484#endif
500 485
501void 486void
502vpn::udpv4_ev (io_watcher &w, short revents) 487vpn::udpv4_ev (io_watcher &w, short revents)
503{ 488{
504 if (revents & (POLLIN | POLLERR)) 489 if (revents & EVENT_READ)
505 { 490 {
506 vpn_packet *pkt = new vpn_packet; 491 vpn_packet *pkt = new vpn_packet;
507 struct sockaddr_in sa; 492 struct sockaddr_in sa;
508 socklen_t sa_len = sizeof (sa); 493 socklen_t sa_len = sizeof (sa);
509 int len; 494 int len;
… …
524 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); 509 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
525 } 510 }
526 511
527 delete pkt; 512 delete pkt;
528 } 513 }
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 514 else
536 { 515 {
537 slog (L_ERR, 516 slog (L_ERR,
538 _("FATAL: unknown revents %08x in socket, terminating\n"), 517 _("FATAL: unknown revents %08x in socket, terminating\n"),
539 revents); 518 revents);
540 exit (1); 519 exit (EXIT_FAILURE);
541 } 520 }
542} 521}
543 522
544void 523void
545vpn::tap_ev (io_watcher &w, short revents) 524vpn::tap_ev (io_watcher &w, short revents)
546{ 525{
547 if (revents & POLLIN) 526 if (revents & EVENT_READ)
548 { 527 {
549 /* process data */ 528 /* process data */
550 tap_packet *pkt; 529 tap_packet *pkt;
551 530
552 pkt = tap->recv (); 531 pkt = tap->recv ();
… …
560 int src = mac2id (pkt->src); 539 int src = mac2id (pkt->src);
561 540
562 if (src != THISNODE->id) 541 if (src != THISNODE->id)
563 { 542 {
564 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); 543 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
565 exit (1); 544 exit (EXIT_FAILURE);
566 } 545 }
567 546
568 if (dst == THISNODE->id) 547 if (dst == THISNODE->id)
569 { 548 {
570 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); 549 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
571 exit (1); 550 exit (EXIT_FAILURE);
572 } 551 }
573 552
574 if (dst > conns.size ()) 553 if (dst > conns.size ())
575 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); 554 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
576 else 555 else
577 inject_data_packet (pkt, dst); 556 inject_data_packet (pkt, dst);
578 } 557 }
579 558
580 delete pkt; 559 delete pkt;
581 } 560 }
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 561 else
588 abort (); 562 abort ();
589} 563}
590 564
591void 565void
… …
596 if (events & EVENT_SHUTDOWN) 570 if (events & EVENT_SHUTDOWN)
597 { 571 {
598 slog (L_INFO, _("preparing shutdown...")); 572 slog (L_INFO, _("preparing shutdown..."));
599 573
600 shutdown_all (); 574 shutdown_all ();
601
602 remove_pid (pidfilename); 575 remove_pid (conf.pidfilename);
603
604 slog (L_INFO, _("terminating")); 576 slog (L_INFO, _("terminating"));
605 577 exit (EXIT_SUCCESS);
606 exit (0);
607 } 578 }
608 579
609 if (events & EVENT_RECONNECT) 580 if (events & EVENT_RECONNECT)
610 { 581 {
611 slog (L_INFO, _("forced reconnect")); 582 slog (L_INFO, _("forced reconnect"));
… …
613 reconnect_all (); 584 reconnect_all ();
614 } 585 }
615 586
616 events = 0; 587 events = 0;
617 } 588 }
618
619 w.at = TSTAMP_CANCEL;
620} 589}
621 590
622void 591void
623vpn::shutdown_all () 592vpn::shutdown_all ()
624{ 593{
… …
637 connection_init (); 606 connection_init ();
638 607
639 for (configuration::node_vector::iterator i = conf.nodes.begin (); 608 for (configuration::node_vector::iterator i = conf.nodes.begin ();
640 i != conf.nodes.end (); ++i) 609 i != conf.nodes.end (); ++i)
641 { 610 {
642 connection *conn = new connection (this); 611 connection *conn = new connection (this, *i);
643
644 conn->conf = *i;
645 conns.push_back (conn); 612 conns.push_back (conn);
646
647 conn->establish_connection (); 613 conn->establish_connection ();
648 } 614 }
649} 615}
650 616
651connection *vpn::find_router () 617connection *vpn::find_router ()
… …
714, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) 680, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
715#endif 681#endif
716#if ENABLE_ICMP 682#if ENABLE_ICMP
717, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) 683, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
718#endif 684#endif
685#if ENABLE_DNS
686, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
687#endif
719, tap_ev_watcher (this, &vpn::tap_ev) 688, tap_ev_watcher (this, &vpn::tap_ev)
720{ 689{
721} 690}
722 691
723vpn::~vpn () 692vpn::~vpn ()

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