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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> |
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|
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" |
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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 | |
273 | bool |
272 | bool |
274 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
273 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 | { |
274 | { |
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|
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); |
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|
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 | |
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300 | sum += (sum >> 16); // carry |
301 | sum += (sum >> 16); // carry |
301 | |
302 | |
302 | return ~sum; |
303 | return ~sum; |
303 | } |
304 | } |
304 | |
305 | |
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|
306 | #if ENABLE_ICMP |
305 | bool |
307 | bool |
306 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
308 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
307 | { |
309 | { |
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|
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); |
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|
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 | } |
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|
326 | #endif |
322 | |
327 | |
323 | bool |
328 | bool |
324 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
329 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
325 | { |
330 | { |
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|
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); |
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|
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 | |
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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. |
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414 | revents); |
421 | revents); |
415 | exit (1); |
422 | exit (1); |
416 | } |
423 | } |
417 | } |
424 | } |
418 | |
425 | |
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|
426 | #if ENABLE_ICMP |
419 | void |
427 | void |
420 | vpn::icmpv4_ev (io_watcher &w, short revents) |
428 | vpn::icmpv4_ev (io_watcher &w, short revents) |
421 | { |
429 | { |
422 | if (revents & (POLLIN | POLLERR)) |
430 | if (revents & (POLLIN | POLLERR)) |
423 | { |
431 | { |
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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 |
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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 | } |
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|
479 | #endif |
471 | |
480 | |
472 | void |
481 | void |
473 | vpn::udpv4_ev (io_watcher &w, short revents) |
482 | vpn::udpv4_ev (io_watcher &w, short revents) |
474 | { |
483 | { |
475 | if (revents & (POLLIN | POLLERR)) |
484 | if (revents & (POLLIN | POLLERR)) |
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525 | int dst = mac2id (pkt->dst); |
534 | int dst = mac2id (pkt->dst); |
526 | int src = mac2id (pkt->src); |
535 | int src = mac2id (pkt->src); |
527 | |
536 | |
528 | if (src != THISNODE->id) |
537 | if (src != THISNODE->id) |
529 | { |
538 | { |
530 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
539 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
531 | exit (1); |
540 | exit (1); |
532 | } |
541 | } |
533 | |
542 | |
534 | if (dst == THISNODE->id) |
543 | if (dst == THISNODE->id) |
535 | { |
544 | { |
536 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
545 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
537 | exit (1); |
546 | exit (1); |
538 | } |
547 | } |
539 | |
548 | |
540 | if (dst > conns.size ()) |
549 | if (dst > conns.size ()) |
541 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
550 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
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547 | if (dst != THISNODE->id) |
556 | if (dst != THISNODE->id) |
548 | conns[dst - 1]->inject_data_packet (pkt); |
557 | conns[dst - 1]->inject_data_packet (pkt); |
549 | } |
558 | } |
550 | else |
559 | else |
551 | { |
560 | { |
552 | // broadcast, first check router, then self, then english |
561 | // broadcast, this is ugly, but due to the security policy |
553 | connection *router = find_router (); |
562 | // we have to connect to all hosts... |
554 | |
|
|
555 | if (router) |
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|
556 | router->inject_data_packet (pkt, true); |
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|
557 | else |
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|
558 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
563 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
559 | if ((*c)->conf != THISNODE) |
564 | if ((*c)->conf != THISNODE) |
560 | (*c)->inject_data_packet (pkt); |
565 | (*c)->inject_data_packet (pkt); |
561 | } |
566 | } |
562 | } |
567 | } |
563 | |
568 | |
564 | delete pkt; |
569 | delete pkt; |
565 | } |
570 | } |
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632 | } |
637 | } |
633 | } |
638 | } |
634 | |
639 | |
635 | connection *vpn::find_router () |
640 | connection *vpn::find_router () |
636 | { |
641 | { |
637 | u32 prio = 0; |
642 | u32 prio = 1; |
638 | connection *router = 0; |
643 | connection *router = 0; |
639 | |
644 | |
640 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
645 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
641 | { |
646 | { |
642 | connection *c = *i; |
647 | connection *c = *i; |
643 | |
648 | |
644 | if (c->conf->routerprio > prio |
649 | if (c->conf->routerprio > prio |
645 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
650 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
646 | && c->ictx && c->octx |
651 | && c->ictx && c->octx |
647 | && c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode |
652 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
648 | && (!THISNODE->routerprio |
|
|
649 | || c->conf->routerprio <= THISNODE->routerprio)) |
|
|
650 | { |
653 | { |
651 | prio = c->conf->routerprio; |
654 | prio = c->conf->routerprio; |
652 | router = c; |
655 | router = c; |
653 | } |
656 | } |
654 | } |
657 | } |
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663 | if (c) |
666 | if (c) |
664 | c->send_connect_request (id); |
667 | c->send_connect_request (id); |
665 | else |
668 | else |
666 | // no router found, aggressively connect to all routers |
669 | // no router found, aggressively connect to all routers |
667 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
670 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
668 | if ((*i)->conf->routerprio) |
671 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
669 | (*i)->establish_connection (); |
672 | (*i)->establish_connection (); |
670 | } |
673 | } |
671 | |
674 | |
672 | void |
675 | void |
673 | connection::dump_status () |
676 | connection::dump_status () |