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/cvs/gvpe/src/vpn.C
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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 1.23 by pcg, Thu Jan 29 18:55:10 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 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);
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
231 { 230 {
232 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); 231 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
233 exit (1); 232 exit (EXIT_FAILURE);
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}
… …
397} 396}
398 397
399void 398void
400vpn::ipv4_ev (io_watcher &w, short revents) 399vpn::ipv4_ev (io_watcher &w, short revents)
401{ 400{
402 if (revents & (POLLIN | POLLERR)) 401 if (revents & EVENT_READ)
403 { 402 {
404 vpn_packet *pkt = new vpn_packet; 403 vpn_packet *pkt = new vpn_packet;
405 struct sockaddr_in sa; 404 struct sockaddr_in sa;
406 socklen_t sa_len = sizeof (sa); 405 socklen_t sa_len = sizeof (sa);
407 int len; 406 int len;
… …
426 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 425 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
427 } 426 }
428 427
429 delete pkt; 428 delete pkt;
430 } 429 }
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 430 else
438 { 431 {
439 slog (L_ERR, 432 slog (L_ERR,
440 _("FATAL: unknown revents %08x in socket, terminating\n"), 433 _("FATAL: unknown revents %08x in socket, terminating\n"),
441 revents); 434 revents);
442 exit (1); 435 exit (EXIT_FAILURE);
443 } 436 }
444} 437}
445 438
446#if ENABLE_ICMP 439#if ENABLE_ICMP
447void 440void
448vpn::icmpv4_ev (io_watcher &w, short revents) 441vpn::icmpv4_ev (io_watcher &w, short revents)
449{ 442{
450 if (revents & (POLLIN | POLLERR)) 443 if (revents & EVENT_READ)
451 { 444 {
452 vpn_packet *pkt = new vpn_packet; 445 vpn_packet *pkt = new vpn_packet;
453 struct sockaddr_in sa; 446 struct sockaddr_in sa;
454 socklen_t sa_len = sizeof (sa); 447 socklen_t sa_len = sizeof (sa);
455 int len; 448 int len;
… …
480 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 473 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
481 } 474 }
482 475
483 delete pkt; 476 delete pkt;
484 } 477 }
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 478 else
492 { 479 {
493 slog (L_ERR, 480 slog (L_ERR,
494 _("FATAL: unknown revents %08x in socket, terminating\n"), 481 _("FATAL: unknown revents %08x in socket, terminating\n"),
495 revents); 482 revents);
496 exit (1); 483 exit (EXIT_FAILURE);
497 } 484 }
498} 485}
499#endif 486#endif
500 487
501void 488void
502vpn::udpv4_ev (io_watcher &w, short revents) 489vpn::udpv4_ev (io_watcher &w, short revents)
503{ 490{
504 if (revents & (POLLIN | POLLERR)) 491 if (revents & EVENT_READ)
505 { 492 {
506 vpn_packet *pkt = new vpn_packet; 493 vpn_packet *pkt = new vpn_packet;
507 struct sockaddr_in sa; 494 struct sockaddr_in sa;
508 socklen_t sa_len = sizeof (sa); 495 socklen_t sa_len = sizeof (sa);
509 int len; 496 int len;
… …
524 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));
525 } 512 }
526 513
527 delete pkt; 514 delete pkt;
528 } 515 }
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 516 else
536 { 517 {
537 slog (L_ERR, 518 slog (L_ERR,
538 _("FATAL: unknown revents %08x in socket, terminating\n"), 519 _("FATAL: unknown revents %08x in socket, terminating\n"),
539 revents); 520 revents);
540 exit (1); 521 exit (EXIT_FAILURE);
541 } 522 }
542} 523}
543 524
544void 525void
545vpn::tap_ev (io_watcher &w, short revents) 526vpn::tap_ev (io_watcher &w, short revents)
546{ 527{
547 if (revents & POLLIN) 528 if (revents & EVENT_READ)
548 { 529 {
549 /* process data */ 530 /* process data */
550 tap_packet *pkt; 531 tap_packet *pkt;
551 532
552 pkt = tap->recv (); 533 pkt = tap->recv ();
… …
560 int src = mac2id (pkt->src); 541 int src = mac2id (pkt->src);
561 542
562 if (src != THISNODE->id) 543 if (src != THISNODE->id)
563 { 544 {
564 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); 545 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
565 exit (1); 546 exit (EXIT_FAILURE);
566 } 547 }
567 548
568 if (dst == THISNODE->id) 549 if (dst == THISNODE->id)
569 { 550 {
570 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); 551 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
571 exit (1); 552 exit (EXIT_FAILURE);
572 } 553 }
573 554
574 if (dst > conns.size ()) 555 if (dst > conns.size ())
575 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); 556 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
576 else 557 else
577 inject_data_packet (pkt, dst); 558 inject_data_packet (pkt, dst);
578 } 559 }
579 560
580 delete pkt; 561 delete pkt;
581 } 562 }
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 563 else
588 abort (); 564 abort ();
589} 565}
590 566
591void 567void
… …
596 if (events & EVENT_SHUTDOWN) 572 if (events & EVENT_SHUTDOWN)
597 { 573 {
598 slog (L_INFO, _("preparing shutdown...")); 574 slog (L_INFO, _("preparing shutdown..."));
599 575
600 shutdown_all (); 576 shutdown_all ();
601
602 remove_pid (pidfilename); 577 remove_pid (pidfilename);
603
604 slog (L_INFO, _("terminating")); 578 slog (L_INFO, _("terminating"));
605 579 exit (EXIT_SUCCESS);
606 exit (0);
607 } 580 }
608 581
609 if (events & EVENT_RECONNECT) 582 if (events & EVENT_RECONNECT)
610 { 583 {
611 slog (L_INFO, _("forced reconnect")); 584 slog (L_INFO, _("forced reconnect"));
… …
613 reconnect_all (); 586 reconnect_all ();
614 } 587 }
615 588
616 events = 0; 589 events = 0;
617 } 590 }
618
619 w.at = TSTAMP_CANCEL;
620} 591}
621 592
622void 593void
623vpn::shutdown_all () 594vpn::shutdown_all ()
624{ 595{

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