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Comparing gvpe/src/vpn.C (file contents):
Revision 1.13 by pcg, Sun Apr 13 16:53:36 2003 UTC vs.
Revision 1.19 by pcg, Thu Oct 16 02:41:21 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"
… …
84 if (ipv4_fd < 0) 84 if (ipv4_fd < 0)
85 return -1; 85 return -1;
86 86
87 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); 87 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
88 88
89#ifdef IP_MTU_DISCOVER 89#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90 // this I really consider a linux bug. I am neither connected 90 // this I really consider a linux bug. I am neither connected
91 // nor do I fragment myself. Linux still sets DF and doesn't 91 // nor do I fragment myself. Linux still sets DF and doesn't
92 // fragment for me sometimes. 92 // fragment for me sometimes.
93 { 93 {
94 int oval = IP_PMTUDISC_DONT; 94 int oval = IP_PMTUDISC_DONT;
… …
122 { 122 {
123 int oval = 1; 123 int oval = 1;
124 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 124 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
125 } 125 }
126 126
127#ifdef IP_MTU_DISCOVER 127#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
128 // this I really consider a linux bug. I am neither connected 128 // this I really consider a linux bug. I am neither connected
129 // nor do I fragment myself. Linux still sets DF and doesn't 129 // nor do I fragment myself. Linux still sets DF and doesn't
130 // fragment for me sometimes. 130 // fragment for me sometimes.
131 { 131 {
132 int oval = IP_PMTUDISC_DONT; 132 int oval = IP_PMTUDISC_DONT;
… …
166 166
167 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); 167 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
168 } 168 }
169#endif 169#endif
170 170
171#ifdef IP_MTU_DISCOVER 171#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
172 // this I really consider a linux bug. I am neither connected 172 // this I really consider a linux bug. I am neither connected
173 // nor do I fragment myself. Linux still sets DF and doesn't 173 // nor do I fragment myself. Linux still sets DF and doesn't
174 // fragment for me sometimes. 174 // fragment for me sometimes.
175 { 175 {
176 int oval = IP_PMTUDISC_DONT; 176 int oval = IP_PMTUDISC_DONT;
… …
271} 271}
272 272
273bool 273bool
274vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 274vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275{ 275{
276#if defined(SOL_IP) && defined(IP_TOS)
276 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 277 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
278#endif
277 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 279 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
278 280
279 return true; 281 return true;
280} 282}
281 283
… …
304 306
305#if ENABLE_ICMP 307#if ENABLE_ICMP
306bool 308bool
307vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 309vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
308{ 310{
311#if defined(SOL_IP) && defined(IP_TOS)
309 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 312 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
313#endif
310 314
311 pkt->unshift_hdr (4); 315 pkt->unshift_hdr (4);
312 316
313 icmphdr *hdr = (icmphdr *)&((*pkt)[0]); 317 icmp_header *hdr = (icmp_header *)&((*pkt)[0]);
314 hdr->type = ::conf.icmp_type; 318 hdr->type = ::conf.icmp_type;
315 hdr->code = 255; 319 hdr->code = 255;
316 hdr->checksum = 0; 320 hdr->checksum = 0;
317 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); 321 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
318 322
… …
323#endif 327#endif
324 328
325bool 329bool
326vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 330vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
327{ 331{
332#if defined(SOL_IP) && defined(IP_TOS)
328 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 333 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
334#endif
329 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 335 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
330 336
331 return true; 337 return true;
338}
339
340void
341vpn::inject_data_packet (tap_packet *pkt, int dst)
342{
343 if (dst)
344 {
345 // unicast
346 if (dst != THISNODE->id)
347 conns[dst - 1]->inject_data_packet (pkt);
348 }
349 else
350 {
351 // broadcast, this is ugly, but due to the security policy
352 // we have to connect to all hosts...
353 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
354 if ((*c)->conf != THISNODE)
355 (*c)->inject_data_packet (pkt, true);
356 }
332} 357}
333 358
334void 359void
335vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 360vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
336{ 361{
… …
353 connection *c = conns[src - 1]; 378 connection *c = conns[src - 1];
354 379
355 if (dst == 0) 380 if (dst == 0)
356 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), 381 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
357 c->conf->nodename, (const char *)rsi); 382 c->conf->nodename, (const char *)rsi);
358 else if (dst != 0 && dst != THISNODE->id) 383 else if (dst != THISNODE->id)
359 { 384 {
360 if (THISNODE->routerprio) 385 if (THISNODE->routerprio)
361 // the tos setting gets lost here. who cares. 386 // the tos setting gets lost here. who cares.
362 conns[dst - 1]->inject_vpn_packet (pkt); 387 conns[dst - 1]->inject_vpn_packet (pkt);
363 else 388 else
… …
435 460
436 if (len > 0) 461 if (len > 0)
437 { 462 {
438 pkt->len = len; 463 pkt->len = len;
439 464
440 icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); 465 icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]);
441 466
442 if (hdr->type == ::conf.icmp_type 467 if (hdr->type == ::conf.icmp_type
443 && hdr->code == 255) 468 && hdr->code == 255)
444 { 469 {
445 // raw sockets deliver the ipv4, but don't expect it on sends 470 // raw sockets deliver the ipv4, but don't expect it on sends
… …
524 /* process data */ 549 /* process data */
525 tap_packet *pkt; 550 tap_packet *pkt;
526 551
527 pkt = tap->recv (); 552 pkt = tap->recv ();
528 553
554 if (!pkt)
555 return;
556
557 if (pkt->len > 14)
558 {
529 int dst = mac2id (pkt->dst); 559 int dst = mac2id (pkt->dst);
530 int src = mac2id (pkt->src); 560 int src = mac2id (pkt->src);
531 561
532 if (src != THISNODE->id) 562 if (src != THISNODE->id)
533 {
534 slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
535 exit (1);
536 }
537
538 if (dst == THISNODE->id)
539 {
540 slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
541 exit (1);
542 }
543
544 if (dst > conns.size ())
545 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
546 else
547 {
548 if (dst)
549 { 563 {
550 // unicast 564 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
551 if (dst != THISNODE->id) 565 exit (1);
552 conns[dst - 1]->inject_data_packet (pkt);
553 } 566 }
567
568 if (dst == THISNODE->id)
569 {
570 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
571 exit (1);
572 }
573
574 if (dst > conns.size ())
575 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
554 else 576 else
555 {
556 // broadcast, this is ugly, but due to the security policy
557 // we have to connect to all hosts...
558 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
559 if ((*c)->conf != THISNODE)
560 (*c)->inject_data_packet (pkt); 577 inject_data_packet (pkt, dst);
561 }
562 } 578 }
563 579
564 delete pkt; 580 delete pkt;
565 } 581 }
566 else if (revents & (POLLHUP | POLLERR)) 582 else if (revents & (POLLHUP | POLLERR))

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