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Comparing gvpe/src/vpn.C (file contents):
Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 UTC vs.
Revision 1.33 by pcg, Wed Mar 23 21:55:39 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>
… …
44 46
45vpn network; // THE vpn (bad design...) 47vpn network; // THE vpn (bad design...)
46 48
47///////////////////////////////////////////////////////////////////////////// 49/////////////////////////////////////////////////////////////////////////////
48 50
49const char *vpn::script_if_up () 51void
52vpn::script_init_env ()
50{ 53{
51 // the tunnel device mtu should be the physical mtu - overhead 54 // the tunnel device mtu should be the physical mtu - overhead
52 // the tricky part is rounding to the cipher key blocksize 55 // the tricky part is rounding to the cipher key blocksize
53 int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; 56 int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
54 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion 57 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
55 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round 58 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
56 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again 59 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
57 60
58 char *env; 61 char *env;
59 asprintf (&env, "CONFBASE=%s", confbase); 62 asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
60 putenv (env);
61 asprintf (&env, "NODENAME=%s", THISNODE->nodename); 63 asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
62 putenv (env);
63 asprintf (&env, "NODEID=%d", THISNODE->id); 64 asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
64 putenv (env);
65 asprintf (&env, "IFNAME=%s", tap->interface ()); 65 asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
66 putenv (env); 66 asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
67 asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
67 asprintf (&env, "MTU=%d", mtu); 68 asprintf (&env, "MTU=%d", mtu); putenv (env);
68 putenv (env);
69 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", 69 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
70 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, 70 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
71 THISNODE->id & 0xff); 71 THISNODE->id & 0xff); putenv (env);
72 putenv (env);
73 72
73 // TODO: info for other nodes, maybe?
74}
75
76const char *vpn::script_if_init ()
77{
78 script_init_env ();
79
80 return tap->if_up ();
81}
82
83const char *vpn::script_if_up ()
84{
85 script_init_env ();
86
87 char *filename;
88 asprintf (&filename,
89 "%s/%s",
90 confbase,
74 return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; 91 ::conf.script_if_up ? ::conf.script_if_up : "if-up");
92
93 return filename;
75} 94}
76 95
77int 96int
78vpn::setup () 97vpn::setup ()
79{ 98{
… …
101 sockinfo si (THISNODE, PROT_IPv4); 120 sockinfo si (THISNODE, PROT_IPv4);
102 121
103 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) 122 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
104 { 123 {
105 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); 124 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
106 exit (1); 125 exit (EXIT_FAILURE);
107 } 126 }
108 127
109 ipv4_ev_watcher.start (ipv4_fd, POLLIN); 128 ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
110 } 129 }
111 130
112 udpv4_fd = -1; 131 udpv4_fd = -1;
113 132
114 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) 133 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
… …
139 sockinfo si (THISNODE, PROT_UDPv4); 158 sockinfo si (THISNODE, PROT_UDPv4);
140 159
141 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 160 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
142 { 161 {
143 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); 162 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
144 exit (1); 163 exit (EXIT_FAILURE);
145 } 164 }
146 165
147 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 166 udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
148 } 167 }
149 168
150 icmpv4_fd = -1; 169 icmpv4_fd = -1;
151 170
152#if ENABLE_ICMP 171#if ENABLE_ICMP
… …
183 sockinfo si (THISNODE, PROT_ICMPv4); 202 sockinfo si (THISNODE, PROT_ICMPv4);
184 203
185 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) 204 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
186 { 205 {
187 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); 206 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
188 exit (1); 207 exit (EXIT_FAILURE);
189 } 208 }
190 209
191 icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); 210 icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
192 } 211 }
193#endif 212#endif
194 213
195 tcpv4_fd = -1; 214 tcpv4_fd = -1;
196 215
… …
213 sockinfo si (THISNODE, PROT_TCPv4); 232 sockinfo si (THISNODE, PROT_TCPv4);
214 233
215 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) 234 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
216 { 235 {
217 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); 236 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
218 exit (1); 237 exit (EXIT_FAILURE);
219 } 238 }
220 239
221 if (listen (tcpv4_fd, 5)) 240 if (listen (tcpv4_fd, 5))
222 { 241 {
223 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); 242 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
224 exit (1); 243 exit (EXIT_FAILURE);
244 }
245
246 tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
247 }
248#endif
249
250#if ENABLE_DNS
251 if (THISNODE->protocols & PROT_DNSv4)
252 {
253 dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
254
255 dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
256
257 if (dnsv4_fd < 0)
258 return -1;
259
260#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
261 // this I really consider a linux bug. I am neither connected
262 // nor do I fragment myself. Linux still sets DF and doesn't
263 // fragment for me sometimes.
264 {
265 int oval = IP_PMTUDISC_DONT;
266 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
267 }
268#endif
269
270 // standard daemon practise...
271 {
272 int oval = 1;
273 setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
274 }
275
276 sockinfo si (THISNODE->dns_hostname,
277 THISNODE->dns_hostname ? THISNODE->dns_port : 0,
278 PROT_DNSv4);
279
280 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
225 } 281 {
282 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
283 exit (EXIT_FAILURE);
284 }
226 285
227 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); 286 dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
228 } 287 }
229#endif 288#endif
230 289
231 tap = new tap_device (); 290 tap = new tap_device ();
232 if (!tap) //D this, of course, never catches 291 if (!tap) //D this, of course, never catches
233 { 292 {
234 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); 293 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
235 exit (1); 294 exit (EXIT_FAILURE);
236 } 295 }
237 296
297 if (tap->if_up () &&
298 !run_script (run_script_cb (this, &vpn::script_if_init), true))
299 {
300 slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
301 tap->if_up ());
302 exit (EXIT_FAILURE);
303 }
304
238 run_script (run_script_cb (this, &vpn::script_if_up), true); 305 if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
306 {
307 slog (L_ERR, _("if-up command execution failed, exiting."));
308 exit (EXIT_FAILURE);
309 }
239 310
240 tap_ev_watcher.start (tap->fd, POLLIN); 311 tap_ev_watcher.start (tap->fd, EVENT_READ);
241 312
242 reconnect_all (); 313 reconnect_all ();
243 314
244 return 0; 315 return 0;
245}
246
247// send a vpn packet out to other hosts
248bool
249vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
250{
251 switch (si.prot)
252 {
253 case PROT_IPv4:
254 return send_ipv4_packet (pkt, si, tos);
255
256 case PROT_UDPv4:
257 return send_udpv4_packet (pkt, si, tos);
258
259#if ENABLE_TCP
260 case PROT_TCPv4:
261 return send_tcpv4_packet (pkt, si, tos);
262#endif
263
264#if ENABLE_ICMP
265 case PROT_ICMPv4:
266 return send_icmpv4_packet (pkt, si, tos);
267#endif
268
269 default:
270 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
271 return false;
272 }
273} 316}
274 317
275bool 318bool
276vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 319vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
277{ 320{
… …
396 else 439 else
397 c->recv_vpn_packet (pkt, rsi); 440 c->recv_vpn_packet (pkt, rsi);
398 } 441 }
399} 442}
400 443
444bool
445vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
446{
447 switch (si.prot)
448 {
449 case PROT_IPv4:
450 return send_ipv4_packet (pkt, si, tos);
451 case PROT_UDPv4:
452 return send_udpv4_packet (pkt, si, tos);
453#if ENABLE_TCP
454 case PROT_TCPv4:
455 return send_tcpv4_packet (pkt, si, tos);
456#endif
457#if ENABLE_ICMP
458 case PROT_ICMPv4:
459 return send_icmpv4_packet (pkt, si, tos);
460#endif
461#if ENABLE_DNS
462 case PROT_DNSv4:
463 return send_dnsv4_packet (pkt, si, tos);
464#endif
465
466 default:
467 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
468 }
469
470 return false;
471}
472
401void 473void
402vpn::ipv4_ev (io_watcher &w, short revents) 474vpn::ipv4_ev (io_watcher &w, short revents)
403{ 475{
404 if (revents & (POLLIN | POLLERR)) 476 if (revents & EVENT_READ)
405 { 477 {
406 vpn_packet *pkt = new vpn_packet; 478 vpn_packet *pkt = new vpn_packet;
407 struct sockaddr_in sa; 479 struct sockaddr_in sa;
408 socklen_t sa_len = sizeof (sa); 480 socklen_t sa_len = sizeof (sa);
409 int len; 481 int len;
… …
414 486
415 if (len > 0) 487 if (len > 0)
416 { 488 {
417 pkt->len = len; 489 pkt->len = len;
418 490
419 // raw sockets deliver the ipv4, but don't expect it on sends 491 // raw sockets deliver the ipv4 header, but don't expect it on sends
420 // this is slow, but...
421 pkt->skip_hdr (IP_OVERHEAD); 492 pkt->skip_hdr (IP_OVERHEAD);
422 493
423 recv_vpn_packet (pkt, si); 494 recv_vpn_packet (pkt, si);
424 } 495 }
425 else 496 else
… …
428 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 499 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
429 } 500 }
430 501
431 delete pkt; 502 delete pkt;
432 } 503 }
433 else if (revents & POLLHUP)
434 {
435 // this cannot ;) happen on udp sockets
436 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
437 exit (1);
438 }
439 else 504 else
440 { 505 {
441 slog (L_ERR, 506 slog (L_ERR,
442 _("FATAL: unknown revents %08x in socket, terminating\n"), 507 _("FATAL: unknown revents %08x in socket, terminating\n"),
443 revents); 508 revents);
444 exit (1); 509 exit (EXIT_FAILURE);
445 } 510 }
446} 511}
447 512
448#if ENABLE_ICMP 513#if ENABLE_ICMP
449void 514void
450vpn::icmpv4_ev (io_watcher &w, short revents) 515vpn::icmpv4_ev (io_watcher &w, short revents)
451{ 516{
452 if (revents & (POLLIN | POLLERR)) 517 if (revents & EVENT_READ)
453 { 518 {
454 vpn_packet *pkt = new vpn_packet; 519 vpn_packet *pkt = new vpn_packet;
455 struct sockaddr_in sa; 520 struct sockaddr_in sa;
456 socklen_t sa_len = sizeof (sa); 521 socklen_t sa_len = sizeof (sa);
457 int len; 522 int len;
… …
482 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 547 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
483 } 548 }
484 549
485 delete pkt; 550 delete pkt;
486 } 551 }
487 else if (revents & POLLHUP)
488 {
489 // this cannot ;) happen on udp sockets
490 slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
491 exit (1);
492 }
493 else 552 else
494 { 553 {
495 slog (L_ERR, 554 slog (L_ERR,
496 _("FATAL: unknown revents %08x in socket, terminating\n"), 555 _("FATAL: unknown revents %08x in socket, terminating\n"),
497 revents); 556 revents);
498 exit (1); 557 exit (EXIT_FAILURE);
499 } 558 }
500} 559}
501#endif 560#endif
502 561
503void 562void
504vpn::udpv4_ev (io_watcher &w, short revents) 563vpn::udpv4_ev (io_watcher &w, short revents)
505{ 564{
506 if (revents & (POLLIN | POLLERR)) 565 if (revents & EVENT_READ)
507 { 566 {
508 vpn_packet *pkt = new vpn_packet; 567 vpn_packet *pkt = new vpn_packet;
509 struct sockaddr_in sa; 568 struct sockaddr_in sa;
510 socklen_t sa_len = sizeof (sa); 569 socklen_t sa_len = sizeof (sa);
511 int len; 570 int len;
… …
526 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); 585 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
527 } 586 }
528 587
529 delete pkt; 588 delete pkt;
530 } 589 }
531 else if (revents & POLLHUP)
532 {
533 // this cannot ;) happen on udp sockets
534 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
535 exit (1);
536 }
537 else 590 else
538 { 591 {
539 slog (L_ERR, 592 slog (L_ERR,
540 _("FATAL: unknown revents %08x in socket, terminating\n"), 593 _("FATAL: unknown revents %08x in socket, terminating\n"),
541 revents); 594 revents);
542 exit (1); 595 exit (EXIT_FAILURE);
543 } 596 }
544} 597}
545 598
546void 599void
547vpn::tap_ev (io_watcher &w, short revents) 600vpn::tap_ev (io_watcher &w, short revents)
548{ 601{
549 if (revents & POLLIN) 602 if (revents & EVENT_READ)
550 { 603 {
551 /* process data */ 604 /* process data */
552 tap_packet *pkt; 605 tap_packet *pkt;
553 606
554 pkt = tap->recv (); 607 pkt = tap->recv ();
… …
561 int dst = mac2id (pkt->dst); 614 int dst = mac2id (pkt->dst);
562 int src = mac2id (pkt->src); 615 int src = mac2id (pkt->src);
563 616
564 if (src != THISNODE->id) 617 if (src != THISNODE->id)
565 { 618 {
566 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); 619 slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
567 exit (1); 620 exit (EXIT_FAILURE);
568 } 621 }
569 622
570 if (dst == THISNODE->id) 623 if (dst == THISNODE->id)
571 { 624 {
572 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); 625 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
573 exit (1); 626 exit (EXIT_FAILURE);
574 } 627 }
575 628
576 if (dst > conns.size ()) 629 if (dst > conns.size ())
577 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); 630 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
578 else 631 else
579 inject_data_packet (pkt, dst); 632 inject_data_packet (pkt, dst);
580 } 633 }
581 634
582 delete pkt; 635 delete pkt;
583 } 636 }
584 else if (revents & (POLLHUP | POLLERR))
585 {
586 slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
587 exit (1);
588 }
589 else 637 else
590 abort (); 638 abort ();
591} 639}
592 640
593void 641void
… …
598 if (events & EVENT_SHUTDOWN) 646 if (events & EVENT_SHUTDOWN)
599 { 647 {
600 slog (L_INFO, _("preparing shutdown...")); 648 slog (L_INFO, _("preparing shutdown..."));
601 649
602 shutdown_all (); 650 shutdown_all ();
603
604 remove_pid (pidfilename); 651 remove_pid (conf.pidfilename);
605
606 slog (L_INFO, _("terminating")); 652 slog (L_INFO, _("terminating"));
607 653 exit (EXIT_SUCCESS);
608 exit (0);
609 } 654 }
610 655
611 if (events & EVENT_RECONNECT) 656 if (events & EVENT_RECONNECT)
612 { 657 {
613 slog (L_INFO, _("forced reconnect")); 658 slog (L_INFO, _("forced reconnect"));
… …
615 reconnect_all (); 660 reconnect_all ();
616 } 661 }
617 662
618 events = 0; 663 events = 0;
619 } 664 }
620
621 w.at = TSTAMP_CANCEL;
622} 665}
623 666
624void 667void
625vpn::shutdown_all () 668vpn::shutdown_all ()
626{ 669{
… …
639 connection_init (); 682 connection_init ();
640 683
641 for (configuration::node_vector::iterator i = conf.nodes.begin (); 684 for (configuration::node_vector::iterator i = conf.nodes.begin ();
642 i != conf.nodes.end (); ++i) 685 i != conf.nodes.end (); ++i)
643 { 686 {
644 connection *conn = new connection (this); 687 connection *conn = new connection (this, *i);
645
646 conn->conf = *i;
647 conns.push_back (conn); 688 conns.push_back (conn);
648
649 conn->establish_connection (); 689 conn->establish_connection ();
650 } 690 }
651} 691}
652 692
653connection *vpn::find_router () 693connection *vpn::find_router ()
… …
716, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) 756, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
717#endif 757#endif
718#if ENABLE_ICMP 758#if ENABLE_ICMP
719, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) 759, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
720#endif 760#endif
761#if ENABLE_DNS
762, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
763#endif
721, tap_ev_watcher (this, &vpn::tap_ev) 764, tap_ev_watcher (this, &vpn::tap_ev)
722{ 765{
723} 766}
724 767
725vpn::~vpn () 768vpn::~vpn ()

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