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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 1.27 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>
… …
98 sockinfo si (THISNODE, PROT_IPv4); 98 sockinfo si (THISNODE, PROT_IPv4);
99 99
100 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) 100 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
101 { 101 {
102 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));
103 exit (1); 103 exit (EXIT_FAILURE);
104 } 104 }
105 105
106 ipv4_ev_watcher.start (ipv4_fd, POLLIN); 106 ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
107 } 107 }
108 108
109 udpv4_fd = -1; 109 udpv4_fd = -1;
110 110
111 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) 111 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
… …
136 sockinfo si (THISNODE, PROT_UDPv4); 136 sockinfo si (THISNODE, PROT_UDPv4);
137 137
138 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 138 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
139 { 139 {
140 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));
141 exit (1); 141 exit (EXIT_FAILURE);
142 } 142 }
143 143
144 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 144 udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
145 } 145 }
146 146
147 icmpv4_fd = -1; 147 icmpv4_fd = -1;
148 148
149#if ENABLE_ICMP 149#if ENABLE_ICMP
… …
180 sockinfo si (THISNODE, PROT_ICMPv4); 180 sockinfo si (THISNODE, PROT_ICMPv4);
181 181
182 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) 182 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
183 { 183 {
184 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));
185 exit (1); 185 exit (EXIT_FAILURE);
186 } 186 }
187 187
188 icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); 188 icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
189 } 189 }
190#endif 190#endif
191 191
192 tcpv4_fd = -1; 192 tcpv4_fd = -1;
193 193
… …
210 sockinfo si (THISNODE, PROT_TCPv4); 210 sockinfo si (THISNODE, PROT_TCPv4);
211 211
212 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) 212 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
213 { 213 {
214 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));
215 exit (1); 215 exit (EXIT_FAILURE);
216 } 216 }
217 217
218 if (listen (tcpv4_fd, 5)) 218 if (listen (tcpv4_fd, 5))
219 { 219 {
220 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));
221 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 ()))
222 } 245 {
246 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
247 exit (EXIT_FAILURE);
248 }
223 249
224 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); 250 dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
225 } 251 }
226#endif 252#endif
227 253
228 tap = new tap_device (); 254 tap = new tap_device ();
229 if (!tap) //D this, of course, never catches 255 if (!tap) //D this, of course, never catches
230 { 256 {
231 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); 257 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
232 exit (1); 258 exit (EXIT_FAILURE);
233 } 259 }
234 260
235 run_script (run_script_cb (this, &vpn::script_if_up), true); 261 run_script (run_script_cb (this, &vpn::script_if_up), true);
236 262
237 tap_ev_watcher.start (tap->fd, POLLIN); 263 tap_ev_watcher.start (tap->fd, EVENT_READ);
238 264
239 reconnect_all (); 265 reconnect_all ();
240 266
241 return 0; 267 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} 268}
271 269
272bool 270bool
273vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 271vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
274{ 272{
… …
396} 394}
397 395
398void 396void
399vpn::ipv4_ev (io_watcher &w, short revents) 397vpn::ipv4_ev (io_watcher &w, short revents)
400{ 398{
401 if (revents & (POLLIN | POLLERR)) 399 if (revents & EVENT_READ)
402 { 400 {
403 vpn_packet *pkt = new vpn_packet; 401 vpn_packet *pkt = new vpn_packet;
404 struct sockaddr_in sa; 402 struct sockaddr_in sa;
405 socklen_t sa_len = sizeof (sa); 403 socklen_t sa_len = sizeof (sa);
406 int len; 404 int len;
… …
425 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 423 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
426 } 424 }
427 425
428 delete pkt; 426 delete pkt;
429 } 427 }
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 428 else
437 { 429 {
438 slog (L_ERR, 430 slog (L_ERR,
439 _("FATAL: unknown revents %08x in socket, terminating\n"), 431 _("FATAL: unknown revents %08x in socket, terminating\n"),
440 revents); 432 revents);
441 exit (1); 433 exit (EXIT_FAILURE);
442 } 434 }
443} 435}
444 436
445#if ENABLE_ICMP 437#if ENABLE_ICMP
446void 438void
447vpn::icmpv4_ev (io_watcher &w, short revents) 439vpn::icmpv4_ev (io_watcher &w, short revents)
448{ 440{
449 if (revents & (POLLIN | POLLERR)) 441 if (revents & EVENT_READ)
450 { 442 {
451 vpn_packet *pkt = new vpn_packet; 443 vpn_packet *pkt = new vpn_packet;
452 struct sockaddr_in sa; 444 struct sockaddr_in sa;
453 socklen_t sa_len = sizeof (sa); 445 socklen_t sa_len = sizeof (sa);
454 int len; 446 int len;
… …
479 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 471 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
480 } 472 }
481 473
482 delete pkt; 474 delete pkt;
483 } 475 }
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 476 else
491 { 477 {
492 slog (L_ERR, 478 slog (L_ERR,
493 _("FATAL: unknown revents %08x in socket, terminating\n"), 479 _("FATAL: unknown revents %08x in socket, terminating\n"),
494 revents); 480 revents);
495 exit (1); 481 exit (EXIT_FAILURE);
496 } 482 }
497} 483}
498#endif 484#endif
499 485
500void 486void
501vpn::udpv4_ev (io_watcher &w, short revents) 487vpn::udpv4_ev (io_watcher &w, short revents)
502{ 488{
503 if (revents & (POLLIN | POLLERR)) 489 if (revents & EVENT_READ)
504 { 490 {
505 vpn_packet *pkt = new vpn_packet; 491 vpn_packet *pkt = new vpn_packet;
506 struct sockaddr_in sa; 492 struct sockaddr_in sa;
507 socklen_t sa_len = sizeof (sa); 493 socklen_t sa_len = sizeof (sa);
508 int len; 494 int len;
… …
523 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));
524 } 510 }
525 511
526 delete pkt; 512 delete pkt;
527 } 513 }
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 514 else
535 { 515 {
536 slog (L_ERR, 516 slog (L_ERR,
537 _("FATAL: unknown revents %08x in socket, terminating\n"), 517 _("FATAL: unknown revents %08x in socket, terminating\n"),
538 revents); 518 revents);
539 exit (1); 519 exit (EXIT_FAILURE);
540 } 520 }
541} 521}
542 522
543void 523void
544vpn::tap_ev (io_watcher &w, short revents) 524vpn::tap_ev (io_watcher &w, short revents)
545{ 525{
546 if (revents & POLLIN) 526 if (revents & EVENT_READ)
547 { 527 {
548 /* process data */ 528 /* process data */
549 tap_packet *pkt; 529 tap_packet *pkt;
550 530
551 pkt = tap->recv (); 531 pkt = tap->recv ();
… …
559 int src = mac2id (pkt->src); 539 int src = mac2id (pkt->src);
560 540
561 if (src != THISNODE->id) 541 if (src != THISNODE->id)
562 { 542 {
563 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."));
564 exit (1); 544 exit (EXIT_FAILURE);
565 } 545 }
566 546
567 if (dst == THISNODE->id) 547 if (dst == THISNODE->id)
568 { 548 {
569 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."));
570 exit (1); 550 exit (EXIT_FAILURE);
571 } 551 }
572 552
573 if (dst > conns.size ()) 553 if (dst > conns.size ())
574 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);
575 else 555 else
576 inject_data_packet (pkt, dst); 556 inject_data_packet (pkt, dst);
577 } 557 }
578 558
579 delete pkt; 559 delete pkt;
580 } 560 }
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 561 else
587 abort (); 562 abort ();
588} 563}
589 564
590void 565void
… …
595 if (events & EVENT_SHUTDOWN) 570 if (events & EVENT_SHUTDOWN)
596 { 571 {
597 slog (L_INFO, _("preparing shutdown...")); 572 slog (L_INFO, _("preparing shutdown..."));
598 573
599 shutdown_all (); 574 shutdown_all ();
600
601 remove_pid (pidfilename); 575 remove_pid (conf.pidfilename);
602
603 slog (L_INFO, _("terminating")); 576 slog (L_INFO, _("terminating"));
604 577 exit (EXIT_SUCCESS);
605 exit (0);
606 } 578 }
607 579
608 if (events & EVENT_RECONNECT) 580 if (events & EVENT_RECONNECT)
609 { 581 {
610 slog (L_INFO, _("forced reconnect")); 582 slog (L_INFO, _("forced reconnect"));
… …
612 reconnect_all (); 584 reconnect_all ();
613 } 585 }
614 586
615 events = 0; 587 events = 0;
616 } 588 }
617
618 w.at = TSTAMP_CANCEL;
619} 589}
620 590
621void 591void
622vpn::shutdown_all () 592vpn::shutdown_all ()
623{ 593{
… …
636 connection_init (); 606 connection_init ();
637 607
638 for (configuration::node_vector::iterator i = conf.nodes.begin (); 608 for (configuration::node_vector::iterator i = conf.nodes.begin ();
639 i != conf.nodes.end (); ++i) 609 i != conf.nodes.end (); ++i)
640 { 610 {
641 connection *conn = new connection (this); 611 connection *conn = new connection (this, *i);
642
643 conn->conf = *i;
644 conns.push_back (conn); 612 conns.push_back (conn);
645
646 conn->establish_connection (); 613 conn->establish_connection ();
647 } 614 }
648} 615}
649 616
650connection *vpn::find_router () 617connection *vpn::find_router ()
… …
713, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) 680, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
714#endif 681#endif
715#if ENABLE_ICMP 682#if ENABLE_ICMP
716, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) 683, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
717#endif 684#endif
685#if ENABLE_DNS
686, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
687#endif
718, tap_ev_watcher (this, &vpn::tap_ev) 688, tap_ev_watcher (this, &vpn::tap_ev)
719{ 689{
720} 690}
721 691
722vpn::~vpn () 692vpn::~vpn ()

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