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Comparing gvpe/src/vpn.C (file contents):
Revision 1.12 by pcg, Sun Apr 13 00:42:04 2003 UTC vs.
Revision 1.14 by pcg, Tue Oct 14 03:22:09 2003 UTC

… …
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 <sys/socket.h>
36#include <netinet/in.h>
35#include <arpa/inet.h> 37#include <arpa/inet.h>
38#include <net/if.h>
39#ifdef HAVE_NETINET_IN_SYSTM_H
40# include <netinet/in_systm.h>
41#endif
42#ifdef HAVE_NETINET_IP_H
36#include <netinet/in.h> 43# include <netinet/ip.h>
44#endif
45#ifdef HAVE_NETINET_TCP_H
46# include <netinet/tcp.h>
47#endif
48#if ENABLE_ICMP
37#include <netinet/ip_icmp.h> 49# include <netinet/ip_icmp.h>
50#endif
38 51
39#include "pidfile.h" 52#include "pidfile.h"
40 53
41#include "connection.h" 54#include "connection.h"
42#include "util.h" 55#include "util.h"
43#include "vpn.h" 56#include "vpn.h"
57
58#if !defined(SOL_IP) && defined(IPPROTO_IP)
59# define SOL_IP IPPROTO_IP
60#endif
44 61
45///////////////////////////////////////////////////////////////////////////// 62/////////////////////////////////////////////////////////////////////////////
46 63
47const char *vpn::script_if_up () 64const char *vpn::script_if_up ()
48{ 65{
… …
84 if (ipv4_fd < 0) 101 if (ipv4_fd < 0)
85 return -1; 102 return -1;
86 103
87 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); 104 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
88 105
89#ifdef IP_MTU_DISCOVER 106#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90 // this I really consider a linux bug. I am neither connected 107 // this I really consider a linux bug. I am neither connected
91 // nor do I fragment myself. Linux still sets DF and doesn't 108 // nor do I fragment myself. Linux still sets DF and doesn't
92 // fragment for me sometimes. 109 // fragment for me sometimes.
93 { 110 {
94 int oval = IP_PMTUDISC_DONT; 111 int oval = IP_PMTUDISC_DONT;
… …
122 { 139 {
123 int oval = 1; 140 int oval = 1;
124 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 141 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
125 } 142 }
126 143
127#ifdef IP_MTU_DISCOVER 144#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
128 // this I really consider a linux bug. I am neither connected 145 // this I really consider a linux bug. I am neither connected
129 // nor do I fragment myself. Linux still sets DF and doesn't 146 // nor do I fragment myself. Linux still sets DF and doesn't
130 // fragment for me sometimes. 147 // fragment for me sometimes.
131 { 148 {
132 int oval = IP_PMTUDISC_DONT; 149 int oval = IP_PMTUDISC_DONT;
… …
166 183
167 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); 184 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
168 } 185 }
169#endif 186#endif
170 187
171#ifdef IP_MTU_DISCOVER 188#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
172 // this I really consider a linux bug. I am neither connected 189 // this I really consider a linux bug. I am neither connected
173 // nor do I fragment myself. Linux still sets DF and doesn't 190 // nor do I fragment myself. Linux still sets DF and doesn't
174 // fragment for me sometimes. 191 // fragment for me sometimes.
175 { 192 {
176 int oval = IP_PMTUDISC_DONT; 193 int oval = IP_PMTUDISC_DONT;
… …
271} 288}
272 289
273bool 290bool
274vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 291vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275{ 292{
293#if defined(SOL_IP) && defined(IP_TOS)
276 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 294 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
295#endif
277 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 296 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
278 297
279 return true; 298 return true;
280} 299}
281 300
… …
300 sum += (sum >> 16); // carry 319 sum += (sum >> 16); // carry
301 320
302 return ~sum; 321 return ~sum;
303} 322}
304 323
324#if ENABLE_ICMP
325struct icmp_header {
326 u8 type;
327 u8 code;
328 u16 checksum;
329 union {
330 struct {
331 u16 id;
332 u16 sequence;
333 } echo;
334 u32 gateway;
335 struct {
336 u16 unused;
337 u16 mtu;
338 } frag;
339 } un;
340};
341
305bool 342bool
306vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 343vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
307{ 344{
345#if defined(SOL_IP) && defined(IP_TOS)
308 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 346 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
347#endif
309 348
310 pkt->unshift_hdr (4); 349 pkt->unshift_hdr (4);
311 350
312 icmphdr *hdr = (icmphdr *)&((*pkt)[0]); 351 icmp_header *hdr = (icmp_header *)&((*pkt)[0]);
313 hdr->type = ::conf.icmp_type; 352 hdr->type = ::conf.icmp_type;
314 hdr->code = 255; 353 hdr->code = 255;
315 hdr->checksum = 0; 354 hdr->checksum = 0;
316 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); 355 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
317 356
318 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 357 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
319 358
320 return true; 359 return true;
321} 360}
361#endif
322 362
323bool 363bool
324vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 364vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
325{ 365{
366#if defined(SOL_IP) && defined(IP_TOS)
326 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 367 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
368#endif
327 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 369 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
328 370
329 return true; 371 return true;
330} 372}
331 373
… …
348 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 390 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
349 else 391 else
350 { 392 {
351 connection *c = conns[src - 1]; 393 connection *c = conns[src - 1];
352 394
353 if (dst == 0 && !THISNODE->routerprio) 395 if (dst == 0)
354 slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), 396 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
355 c->conf->nodename, (const char *)rsi); 397 c->conf->nodename, (const char *)rsi);
356 else if (dst != 0 && dst != THISNODE->id) 398 else if (dst != 0 && dst != THISNODE->id)
357 { 399 {
358 if (THISNODE->routerprio) 400 if (THISNODE->routerprio)
359 // the tos setting gets lost here. who cares. 401 // the tos setting gets lost here. who cares.
… …
414 revents); 456 revents);
415 exit (1); 457 exit (1);
416 } 458 }
417} 459}
418 460
461#if ENABLE_ICMP
419void 462void
420vpn::icmpv4_ev (io_watcher &w, short revents) 463vpn::icmpv4_ev (io_watcher &w, short revents)
421{ 464{
422 if (revents & (POLLIN | POLLERR)) 465 if (revents & (POLLIN | POLLERR))
423 { 466 {
… …
432 475
433 if (len > 0) 476 if (len > 0)
434 { 477 {
435 pkt->len = len; 478 pkt->len = len;
436 479
437 icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); 480 icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]);
438 481
439 if (hdr->type == ::conf.icmp_type 482 if (hdr->type == ::conf.icmp_type
440 && hdr->code == 255) 483 && hdr->code == 255)
441 { 484 {
442 // raw sockets deliver the ipv4, but don't expect it on sends 485 // raw sockets deliver the ipv4, but don't expect it on sends
… …
466 _("FATAL: unknown revents %08x in socket, terminating\n"), 509 _("FATAL: unknown revents %08x in socket, terminating\n"),
467 revents); 510 revents);
468 exit (1); 511 exit (1);
469 } 512 }
470} 513}
514#endif
471 515
472void 516void
473vpn::udpv4_ev (io_watcher &w, short revents) 517vpn::udpv4_ev (io_watcher &w, short revents)
474{ 518{
475 if (revents & (POLLIN | POLLERR)) 519 if (revents & (POLLIN | POLLERR))
… …
525 int dst = mac2id (pkt->dst); 569 int dst = mac2id (pkt->dst);
526 int src = mac2id (pkt->src); 570 int src = mac2id (pkt->src);
527 571
528 if (src != THISNODE->id) 572 if (src != THISNODE->id)
529 { 573 {
530 slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); 574 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
531 exit (1); 575 exit (1);
532 } 576 }
533 577
534 if (dst == THISNODE->id) 578 if (dst == THISNODE->id)
535 { 579 {
536 slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); 580 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
537 exit (1); 581 exit (1);
538 } 582 }
539 583
540 if (dst > conns.size ()) 584 if (dst > conns.size ())
541 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); 585 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
… …
547 if (dst != THISNODE->id) 591 if (dst != THISNODE->id)
548 conns[dst - 1]->inject_data_packet (pkt); 592 conns[dst - 1]->inject_data_packet (pkt);
549 } 593 }
550 else 594 else
551 { 595 {
552 // broadcast, first check router, then self, then english 596 // broadcast, this is ugly, but due to the security policy
553 connection *router = find_router (); 597 // we have to connect to all hosts...
554
555 if (router)
556 router->inject_data_packet (pkt, true);
557 else
558 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) 598 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
559 if ((*c)->conf != THISNODE) 599 if ((*c)->conf != THISNODE)
560 (*c)->inject_data_packet (pkt); 600 (*c)->inject_data_packet (pkt);
561 } 601 }
562 } 602 }
563 603
564 delete pkt; 604 delete pkt;
565 } 605 }
… …
639 679
640 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 680 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
641 { 681 {
642 connection *c = *i; 682 connection *c = *i;
643 683
644 if (c->conf->routerprio >= prio 684 if (c->conf->routerprio > prio
645 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use 685 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
646 && c->ictx && c->octx 686 && c->ictx && c->octx
647 && c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode 687 && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
648 && (!THISNODE->routerprio
649 || c->conf->routerprio <= THISNODE->routerprio))
650 { 688 {
651 prio = c->conf->routerprio; 689 prio = c->conf->routerprio;
652 router = c; 690 router = c;
653 } 691 }
654 } 692 }
… …
663 if (c) 701 if (c)
664 c->send_connect_request (id); 702 c->send_connect_request (id);
665 else 703 else
666 // no router found, aggressively connect to all routers 704 // no router found, aggressively connect to all routers
667 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 705 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
668 if ((*i)->conf->routerprio) 706 if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
669 (*i)->establish_connection (); 707 (*i)->establish_connection ();
670} 708}
671 709
672void 710void
673connection::dump_status () 711connection::dump_status ()

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