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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 1.24 by pcg, Fri Apr 2 14:42:45 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>
… …
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} 268}
… …
259#endif 285#endif
260 286
261#if ENABLE_ICMP 287#if ENABLE_ICMP
262 case PROT_ICMPv4: 288 case PROT_ICMPv4:
263 return send_icmpv4_packet (pkt, si, tos); 289 return send_icmpv4_packet (pkt, si, tos);
290#endif
291
292#if ENABLE_DNS
293 case PROT_DNSv4:
294 return send_dnsv4_packet (pkt, si, tos);
264#endif 295#endif
265 296
266 default: 297 default:
267 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); 298 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
268 return false; 299 return false;
… …
396} 427}
397 428
398void 429void
399vpn::ipv4_ev (io_watcher &w, short revents) 430vpn::ipv4_ev (io_watcher &w, short revents)
400{ 431{
401 if (revents & (POLLIN | POLLERR)) 432 if (revents & EVENT_READ)
402 { 433 {
403 vpn_packet *pkt = new vpn_packet; 434 vpn_packet *pkt = new vpn_packet;
404 struct sockaddr_in sa; 435 struct sockaddr_in sa;
405 socklen_t sa_len = sizeof (sa); 436 socklen_t sa_len = sizeof (sa);
406 int len; 437 int len;
… …
425 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 456 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
426 } 457 }
427 458
428 delete pkt; 459 delete pkt;
429 } 460 }
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 461 else
437 { 462 {
438 slog (L_ERR, 463 slog (L_ERR,
439 _("FATAL: unknown revents %08x in socket, terminating\n"), 464 _("FATAL: unknown revents %08x in socket, terminating\n"),
440 revents); 465 revents);
441 exit (1); 466 exit (EXIT_FAILURE);
442 } 467 }
443} 468}
444 469
445#if ENABLE_ICMP 470#if ENABLE_ICMP
446void 471void
447vpn::icmpv4_ev (io_watcher &w, short revents) 472vpn::icmpv4_ev (io_watcher &w, short revents)
448{ 473{
449 if (revents & (POLLIN | POLLERR)) 474 if (revents & EVENT_READ)
450 { 475 {
451 vpn_packet *pkt = new vpn_packet; 476 vpn_packet *pkt = new vpn_packet;
452 struct sockaddr_in sa; 477 struct sockaddr_in sa;
453 socklen_t sa_len = sizeof (sa); 478 socklen_t sa_len = sizeof (sa);
454 int len; 479 int len;
… …
479 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 504 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
480 } 505 }
481 506
482 delete pkt; 507 delete pkt;
483 } 508 }
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 509 else
491 { 510 {
492 slog (L_ERR, 511 slog (L_ERR,
493 _("FATAL: unknown revents %08x in socket, terminating\n"), 512 _("FATAL: unknown revents %08x in socket, terminating\n"),
494 revents); 513 revents);
495 exit (1); 514 exit (EXIT_FAILURE);
496 } 515 }
497} 516}
498#endif 517#endif
499 518
500void 519void
501vpn::udpv4_ev (io_watcher &w, short revents) 520vpn::udpv4_ev (io_watcher &w, short revents)
502{ 521{
503 if (revents & (POLLIN | POLLERR)) 522 if (revents & EVENT_READ)
504 { 523 {
505 vpn_packet *pkt = new vpn_packet; 524 vpn_packet *pkt = new vpn_packet;
506 struct sockaddr_in sa; 525 struct sockaddr_in sa;
507 socklen_t sa_len = sizeof (sa); 526 socklen_t sa_len = sizeof (sa);
508 int len; 527 int len;
… …
523 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); 542 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
524 } 543 }
525 544
526 delete pkt; 545 delete pkt;
527 } 546 }
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 547 else
535 { 548 {
536 slog (L_ERR, 549 slog (L_ERR,
537 _("FATAL: unknown revents %08x in socket, terminating\n"), 550 _("FATAL: unknown revents %08x in socket, terminating\n"),
538 revents); 551 revents);
539 exit (1); 552 exit (EXIT_FAILURE);
540 } 553 }
541} 554}
542 555
543void 556void
544vpn::tap_ev (io_watcher &w, short revents) 557vpn::tap_ev (io_watcher &w, short revents)
545{ 558{
546 if (revents & POLLIN) 559 if (revents & EVENT_READ)
547 { 560 {
548 /* process data */ 561 /* process data */
549 tap_packet *pkt; 562 tap_packet *pkt;
550 563
551 pkt = tap->recv (); 564 pkt = tap->recv ();
… …
559 int src = mac2id (pkt->src); 572 int src = mac2id (pkt->src);
560 573
561 if (src != THISNODE->id) 574 if (src != THISNODE->id)
562 { 575 {
563 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); 576 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
564 exit (1); 577 exit (EXIT_FAILURE);
565 } 578 }
566 579
567 if (dst == THISNODE->id) 580 if (dst == THISNODE->id)
568 { 581 {
569 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); 582 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
570 exit (1); 583 exit (EXIT_FAILURE);
571 } 584 }
572 585
573 if (dst > conns.size ()) 586 if (dst > conns.size ())
574 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); 587 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
575 else 588 else
576 inject_data_packet (pkt, dst); 589 inject_data_packet (pkt, dst);
577 } 590 }
578 591
579 delete pkt; 592 delete pkt;
580 } 593 }
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 594 else
587 abort (); 595 abort ();
588} 596}
589 597
590void 598void
… …
595 if (events & EVENT_SHUTDOWN) 603 if (events & EVENT_SHUTDOWN)
596 { 604 {
597 slog (L_INFO, _("preparing shutdown...")); 605 slog (L_INFO, _("preparing shutdown..."));
598 606
599 shutdown_all (); 607 shutdown_all ();
600
601 remove_pid (pidfilename); 608 remove_pid (conf.pidfilename);
602
603 slog (L_INFO, _("terminating")); 609 slog (L_INFO, _("terminating"));
604 610 exit (EXIT_SUCCESS);
605 exit (0);
606 } 611 }
607 612
608 if (events & EVENT_RECONNECT) 613 if (events & EVENT_RECONNECT)
609 { 614 {
610 slog (L_INFO, _("forced reconnect")); 615 slog (L_INFO, _("forced reconnect"));
… …
612 reconnect_all (); 617 reconnect_all ();
613 } 618 }
614 619
615 events = 0; 620 events = 0;
616 } 621 }
617
618 w.at = TSTAMP_CANCEL;
619} 622}
620 623
621void 624void
622vpn::shutdown_all () 625vpn::shutdown_all ()
623{ 626{
… …
713, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) 716, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
714#endif 717#endif
715#if ENABLE_ICMP 718#if ENABLE_ICMP
716, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) 719, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
717#endif 720#endif
721#if ENABLE_DNS
722, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
723#endif
718, tap_ev_watcher (this, &vpn::tap_ev) 724, tap_ev_watcher (this, &vpn::tap_ev)
719{ 725{
720} 726}
721 727
722vpn::~vpn () 728vpn::~vpn ()

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