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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 1.17 by pcg, Wed Oct 15 06:06:41 2003 UTC

… …
24#include <cstring> 24#include <cstring>
25#include <cstdio> 25#include <cstdio>
26 26
27#include <sys/types.h> 27#include <sys/types.h>
28#include <sys/socket.h> 28#include <sys/socket.h>
29#include <sys/poll.h>
30#include <sys/wait.h> 29#include <sys/wait.h>
31#include <errno.h> 30#include <errno.h>
32#include <time.h> 31#include <time.h>
33#include <unistd.h> 32#include <unistd.h>
34#include <fcntl.h> 33#include <fcntl.h>
35#include <arpa/inet.h> 34#include <sys/socket.h>
36#include <netinet/in.h> 35
37#include <netinet/ip_icmp.h> 36#include "netcompat.h"
38 37
39#include "pidfile.h" 38#include "pidfile.h"
40 39
41#include "connection.h" 40#include "connection.h"
42#include "util.h" 41#include "util.h"
… …
84 if (ipv4_fd < 0) 83 if (ipv4_fd < 0)
85 return -1; 84 return -1;
86 85
87 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); 86 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
88 87
89#ifdef IP_MTU_DISCOVER 88#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90 // this I really consider a linux bug. I am neither connected 89 // this I really consider a linux bug. I am neither connected
91 // nor do I fragment myself. Linux still sets DF and doesn't 90 // nor do I fragment myself. Linux still sets DF and doesn't
92 // fragment for me sometimes. 91 // fragment for me sometimes.
93 { 92 {
94 int oval = IP_PMTUDISC_DONT; 93 int oval = IP_PMTUDISC_DONT;
… …
122 { 121 {
123 int oval = 1; 122 int oval = 1;
124 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 123 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
125 } 124 }
126 125
127#ifdef IP_MTU_DISCOVER 126#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
128 // this I really consider a linux bug. I am neither connected 127 // this I really consider a linux bug. I am neither connected
129 // nor do I fragment myself. Linux still sets DF and doesn't 128 // nor do I fragment myself. Linux still sets DF and doesn't
130 // fragment for me sometimes. 129 // fragment for me sometimes.
131 { 130 {
132 int oval = IP_PMTUDISC_DONT; 131 int oval = IP_PMTUDISC_DONT;
… …
166 165
167 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); 166 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
168 } 167 }
169#endif 168#endif
170 169
171#ifdef IP_MTU_DISCOVER 170#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
172 // this I really consider a linux bug. I am neither connected 171 // this I really consider a linux bug. I am neither connected
173 // nor do I fragment myself. Linux still sets DF and doesn't 172 // nor do I fragment myself. Linux still sets DF and doesn't
174 // fragment for me sometimes. 173 // fragment for me sometimes.
175 { 174 {
176 int oval = IP_PMTUDISC_DONT; 175 int oval = IP_PMTUDISC_DONT;
… …
271} 270}
272 271
273bool 272bool
274vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 273vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275{ 274{
275#if defined(SOL_IP) && defined(IP_TOS)
276 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 276 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
277#endif
277 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 278 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
278 279
279 return true; 280 return true;
280} 281}
281 282
… …
300 sum += (sum >> 16); // carry 301 sum += (sum >> 16); // carry
301 302
302 return ~sum; 303 return ~sum;
303} 304}
304 305
306#if ENABLE_ICMP
305bool 307bool
306vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 308vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
307{ 309{
310#if defined(SOL_IP) && defined(IP_TOS)
308 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 311 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
312#endif
309 313
310 pkt->unshift_hdr (4); 314 pkt->unshift_hdr (4);
311 315
312 icmphdr *hdr = (icmphdr *)&((*pkt)[0]); 316 icmp_header *hdr = (icmp_header *)&((*pkt)[0]);
313 hdr->type = ::conf.icmp_type; 317 hdr->type = ::conf.icmp_type;
314 hdr->code = 255; 318 hdr->code = 255;
315 hdr->checksum = 0; 319 hdr->checksum = 0;
316 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); 320 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
317 321
318 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 322 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
319 323
320 return true; 324 return true;
321} 325}
326#endif
322 327
323bool 328bool
324vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 329vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
325{ 330{
331#if defined(SOL_IP) && defined(IP_TOS)
326 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 332 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
333#endif
327 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 334 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
328 335
329 return true; 336 return true;
330} 337}
331 338
… …
348 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 355 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
349 else 356 else
350 { 357 {
351 connection *c = conns[src - 1]; 358 connection *c = conns[src - 1];
352 359
353 if (dst == 0 && !THISNODE->routerprio) 360 if (dst == 0)
354 slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), 361 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
355 c->conf->nodename, (const char *)rsi); 362 c->conf->nodename, (const char *)rsi);
356 else if (dst != 0 && dst != THISNODE->id) 363 else if (dst != 0 && dst != THISNODE->id)
357 { 364 {
358 if (THISNODE->routerprio) 365 if (THISNODE->routerprio)
359 // the tos setting gets lost here. who cares. 366 // the tos setting gets lost here. who cares.
… …
414 revents); 421 revents);
415 exit (1); 422 exit (1);
416 } 423 }
417} 424}
418 425
426#if ENABLE_ICMP
419void 427void
420vpn::icmpv4_ev (io_watcher &w, short revents) 428vpn::icmpv4_ev (io_watcher &w, short revents)
421{ 429{
422 if (revents & (POLLIN | POLLERR)) 430 if (revents & (POLLIN | POLLERR))
423 { 431 {
… …
432 440
433 if (len > 0) 441 if (len > 0)
434 { 442 {
435 pkt->len = len; 443 pkt->len = len;
436 444
437 icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); 445 icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]);
438 446
439 if (hdr->type == ::conf.icmp_type 447 if (hdr->type == ::conf.icmp_type
440 && hdr->code == 255) 448 && hdr->code == 255)
441 { 449 {
442 // raw sockets deliver the ipv4, but don't expect it on sends 450 // raw sockets deliver the ipv4, but don't expect it on sends
… …
466 _("FATAL: unknown revents %08x in socket, terminating\n"), 474 _("FATAL: unknown revents %08x in socket, terminating\n"),
467 revents); 475 revents);
468 exit (1); 476 exit (1);
469 } 477 }
470} 478}
479#endif
471 480
472void 481void
473vpn::udpv4_ev (io_watcher &w, short revents) 482vpn::udpv4_ev (io_watcher &w, short revents)
474{ 483{
475 if (revents & (POLLIN | POLLERR)) 484 if (revents & (POLLIN | POLLERR))
… …
520 /* process data */ 529 /* process data */
521 tap_packet *pkt; 530 tap_packet *pkt;
522 531
523 pkt = tap->recv (); 532 pkt = tap->recv ();
524 533
534 if (!pkt)
535 return;
536
537 if (pkt->len > 14)
538 {
525 int dst = mac2id (pkt->dst); 539 int dst = mac2id (pkt->dst);
526 int src = mac2id (pkt->src); 540 int src = mac2id (pkt->src);
527 541
528 if (src != THISNODE->id) 542 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 { 543 {
546 // unicast 544 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
547 if (dst != THISNODE->id) 545 exit (1);
548 conns[dst - 1]->inject_data_packet (pkt);
549 } 546 }
547
548 if (dst == THISNODE->id)
549 {
550 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
551 exit (1);
552 }
553
554 if (dst > conns.size ())
555 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
550 else 556 else
551 { 557 {
552 // broadcast, first check router, then self, then english
553 connection *router = find_router ();
554
555 if (router) 558 if (dst)
559 {
560 // unicast
561 if (dst != THISNODE->id)
556 router->inject_data_packet (pkt, true); 562 conns[dst - 1]->inject_data_packet (pkt);
563 }
557 else 564 else
565 {
566 // broadcast, this is ugly, but due to the security policy
567 // we have to connect to all hosts...
558 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) 568 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
559 if ((*c)->conf != THISNODE) 569 if ((*c)->conf != THISNODE)
560 (*c)->inject_data_packet (pkt); 570 (*c)->inject_data_packet (pkt);
571 }
561 } 572 }
562 } 573 }
563 574
564 delete pkt; 575 delete pkt;
565 } 576 }
… …
639 650
640 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 651 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
641 { 652 {
642 connection *c = *i; 653 connection *c = *i;
643 654
644 if (c->conf->routerprio >= prio 655 if (c->conf->routerprio > prio
645 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use 656 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
646 && c->ictx && c->octx 657 && c->ictx && c->octx
647 && c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode 658 && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
648 && (!THISNODE->routerprio
649 || c->conf->routerprio <= THISNODE->routerprio))
650 { 659 {
651 prio = c->conf->routerprio; 660 prio = c->conf->routerprio;
652 router = c; 661 router = c;
653 } 662 }
654 } 663 }
… …
663 if (c) 672 if (c)
664 c->send_connect_request (id); 673 c->send_connect_request (id);
665 else 674 else
666 // no router found, aggressively connect to all routers 675 // no router found, aggressively connect to all routers
667 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 676 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
668 if ((*i)->conf->routerprio) 677 if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
669 (*i)->establish_connection (); 678 (*i)->establish_connection ();
670} 679}
671 680
672void 681void
673connection::dump_status () 682connection::dump_status ()

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