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Comparing gvpe/src/vpn.C (file contents):
Revision 1.11 by pcg, Sun Apr 13 00:35:46 2003 UTC vs.
Revision 1.20 by pcg, Thu Oct 16 14:12:00 2003 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 4
4 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
5 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
6 the Free Software Foundation; either version 2 of the License, or 7 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version. 8 (at your option) any later version.
… …
24#include <cstring> 25#include <cstring>
25#include <cstdio> 26#include <cstdio>
26 27
27#include <sys/types.h> 28#include <sys/types.h>
28#include <sys/socket.h> 29#include <sys/socket.h>
29#include <sys/poll.h>
30#include <sys/wait.h> 30#include <sys/wait.h>
31#include <errno.h> 31#include <errno.h>
32#include <time.h> 32#include <time.h>
33#include <unistd.h> 33#include <unistd.h>
34#include <fcntl.h> 34#include <fcntl.h>
35#include <arpa/inet.h> 35#include <sys/socket.h>
36#include <netinet/in.h> 36
37#include <netinet/ip_icmp.h> 37#include "netcompat.h"
38 38
39#include "pidfile.h" 39#include "pidfile.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
45vpn network; // THE vpn (bad design...)
44 46
45///////////////////////////////////////////////////////////////////////////// 47/////////////////////////////////////////////////////////////////////////////
46 48
47const char *vpn::script_if_up () 49const char *vpn::script_if_up ()
48{ 50{
… …
84 if (ipv4_fd < 0) 86 if (ipv4_fd < 0)
85 return -1; 87 return -1;
86 88
87 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); 89 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
88 90
89#ifdef IP_MTU_DISCOVER 91#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90 // this I really consider a linux bug. I am neither connected 92 // this I really consider a linux bug. I am neither connected
91 // nor do I fragment myself. Linux still sets DF and doesn't 93 // nor do I fragment myself. Linux still sets DF and doesn't
92 // fragment for me sometimes. 94 // fragment for me sometimes.
93 { 95 {
94 int oval = IP_PMTUDISC_DONT; 96 int oval = IP_PMTUDISC_DONT;
… …
122 { 124 {
123 int oval = 1; 125 int oval = 1;
124 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 126 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
125 } 127 }
126 128
127#ifdef IP_MTU_DISCOVER 129#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
128 // this I really consider a linux bug. I am neither connected 130 // this I really consider a linux bug. I am neither connected
129 // nor do I fragment myself. Linux still sets DF and doesn't 131 // nor do I fragment myself. Linux still sets DF and doesn't
130 // fragment for me sometimes. 132 // fragment for me sometimes.
131 { 133 {
132 int oval = IP_PMTUDISC_DONT; 134 int oval = IP_PMTUDISC_DONT;
… …
166 168
167 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); 169 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
168 } 170 }
169#endif 171#endif
170 172
171#ifdef IP_MTU_DISCOVER 173#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
172 // this I really consider a linux bug. I am neither connected 174 // this I really consider a linux bug. I am neither connected
173 // nor do I fragment myself. Linux still sets DF and doesn't 175 // nor do I fragment myself. Linux still sets DF and doesn't
174 // fragment for me sometimes. 176 // fragment for me sometimes.
175 { 177 {
176 int oval = IP_PMTUDISC_DONT; 178 int oval = IP_PMTUDISC_DONT;
… …
271} 273}
272 274
273bool 275bool
274vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 276vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275{ 277{
278#if defined(SOL_IP) && defined(IP_TOS)
276 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 279 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
280#endif
277 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 281 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
278 282
279 return true; 283 return true;
280} 284}
281 285
… …
300 sum += (sum >> 16); // carry 304 sum += (sum >> 16); // carry
301 305
302 return ~sum; 306 return ~sum;
303} 307}
304 308
309#if ENABLE_ICMP
305bool 310bool
306vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 311vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
307{ 312{
313#if defined(SOL_IP) && defined(IP_TOS)
308 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 314 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
315#endif
309 316
310 pkt->unshift_hdr (4); 317 pkt->unshift_hdr (4);
311 318
312 icmphdr *hdr = (icmphdr *)&((*pkt)[0]); 319 icmp_header *hdr = (icmp_header *)&((*pkt)[0]);
313 hdr->type = ::conf.icmp_type; 320 hdr->type = ::conf.icmp_type;
314 hdr->code = 255; 321 hdr->code = 255;
315 hdr->checksum = 0; 322 hdr->checksum = 0;
316 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); 323 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
317 324
318 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 325 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
319 326
320 return true; 327 return true;
321} 328}
329#endif
322 330
323bool 331bool
324vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 332vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
325{ 333{
334#if defined(SOL_IP) && defined(IP_TOS)
326 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 335 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
336#endif
327 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 337 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
328 338
329 return true; 339 return true;
340}
341
342void
343vpn::inject_data_packet (tap_packet *pkt, int dst)
344{
345 if (dst)
346 {
347 // unicast
348 if (dst != THISNODE->id)
349 conns[dst - 1]->inject_data_packet (pkt);
350 }
351 else
352 {
353 // broadcast, this is ugly, but due to the security policy
354 // we have to connect to all hosts...
355 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
356 if ((*c)->conf != THISNODE)
357 (*c)->inject_data_packet (pkt, true);
358 }
330} 359}
331 360
332void 361void
333vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 362vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
334{ 363{
… …
348 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 377 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
349 else 378 else
350 { 379 {
351 connection *c = conns[src - 1]; 380 connection *c = conns[src - 1];
352 381
353 if (dst == 0 && !THISNODE->routerprio) 382 if (dst == 0)
354 slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), 383 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
355 c->conf->nodename, (const char *)rsi); 384 c->conf->nodename, (const char *)rsi);
356 else if (dst != 0 && dst != THISNODE->id) 385 else if (dst != THISNODE->id)
357 { 386 {
358 if (THISNODE->routerprio) 387 if (THISNODE->routerprio)
359 // the tos setting gets lost here. who cares. 388 // the tos setting gets lost here. who cares.
360 conns[dst - 1]->inject_vpn_packet (pkt); 389 conns[dst - 1]->inject_vpn_packet (pkt);
361 else 390 else
… …
414 revents); 443 revents);
415 exit (1); 444 exit (1);
416 } 445 }
417} 446}
418 447
448#if ENABLE_ICMP
419void 449void
420vpn::icmpv4_ev (io_watcher &w, short revents) 450vpn::icmpv4_ev (io_watcher &w, short revents)
421{ 451{
422 if (revents & (POLLIN | POLLERR)) 452 if (revents & (POLLIN | POLLERR))
423 { 453 {
… …
432 462
433 if (len > 0) 463 if (len > 0)
434 { 464 {
435 pkt->len = len; 465 pkt->len = len;
436 466
437 icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); 467 icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]);
438 468
439 if (hdr->type == ::conf.icmp_type 469 if (hdr->type == ::conf.icmp_type
440 && hdr->code == 255) 470 && hdr->code == 255)
441 { 471 {
442 // raw sockets deliver the ipv4, but don't expect it on sends 472 // raw sockets deliver the ipv4, but don't expect it on sends
… …
466 _("FATAL: unknown revents %08x in socket, terminating\n"), 496 _("FATAL: unknown revents %08x in socket, terminating\n"),
467 revents); 497 revents);
468 exit (1); 498 exit (1);
469 } 499 }
470} 500}
501#endif
471 502
472void 503void
473vpn::udpv4_ev (io_watcher &w, short revents) 504vpn::udpv4_ev (io_watcher &w, short revents)
474{ 505{
475 if (revents & (POLLIN | POLLERR)) 506 if (revents & (POLLIN | POLLERR))
… …
520 /* process data */ 551 /* process data */
521 tap_packet *pkt; 552 tap_packet *pkt;
522 553
523 pkt = tap->recv (); 554 pkt = tap->recv ();
524 555
556 if (!pkt)
557 return;
558
559 if (pkt->len > 14)
560 {
525 int dst = mac2id (pkt->dst); 561 int dst = mac2id (pkt->dst);
526 int src = mac2id (pkt->src); 562 int src = mac2id (pkt->src);
527 563
528 if (src != THISNODE->id) 564 if (src != THISNODE->id)
529 {
530 slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
531 exit (1);
532 }
533
534 if (dst == THISNODE->id)
535 {
536 slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
537 exit (1);
538 }
539
540 if (dst > conns.size ())
541 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
542 else
543 {
544 if (dst)
545 { 565 {
546 // unicast 566 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
547 if (dst != THISNODE->id) 567 exit (1);
548 conns[dst - 1]->inject_data_packet (pkt);
549 } 568 }
569
570 if (dst == THISNODE->id)
571 {
572 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
573 exit (1);
574 }
575
576 if (dst > conns.size ())
577 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
550 else 578 else
551 {
552 // broadcast, first check router, then self, then english
553 connection *router = find_router ();
554
555 if (router)
556 router->inject_data_packet (pkt, true); 579 inject_data_packet (pkt, dst);
557 else
558 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
559 if ((*c)->conf != THISNODE)
560 (*c)->inject_data_packet (pkt);
561 }
562 } 580 }
563 581
564 delete pkt; 582 delete pkt;
565 } 583 }
566 else if (revents & (POLLHUP | POLLERR)) 584 else if (revents & (POLLHUP | POLLERR))
… …
632 } 650 }
633} 651}
634 652
635connection *vpn::find_router () 653connection *vpn::find_router ()
636{ 654{
637 u32 prio = 0; 655 u32 prio = 1;
638 connection *router = 0; 656 connection *router = 0;
639 657
640 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 658 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
641 { 659 {
642 connection *c = *i; 660 connection *c = *i;
643 661
644 if (c->conf->routerprio > prio 662 if (c->conf->routerprio > prio
645 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use 663 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
646 && c->ictx && c->octx 664 && c->ictx && c->octx
647 && c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode 665 && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
648 && (!THISNODE->routerprio
649 || c->conf->routerprio <= THISNODE->routerprio))
650 { 666 {
651 prio = c->conf->routerprio; 667 prio = c->conf->routerprio;
652 router = c; 668 router = c;
653 } 669 }
654 } 670 }
… …
663 if (c) 679 if (c)
664 c->send_connect_request (id); 680 c->send_connect_request (id);
665 else 681 else
666 // no router found, aggressively connect to all routers 682 // no router found, aggressively connect to all routers
667 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 683 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
668 if ((*i)->conf->routerprio) 684 if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
669 (*i)->establish_connection (); 685 (*i)->establish_connection ();
670} 686}
671 687
672void 688void
673connection::dump_status () 689connection::dump_status ()

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