… | |
… | |
29 | #include <sys/poll.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> |
|
|
35 | #include <sys/socket.h> |
|
|
36 | #include <netinet/in.h> |
34 | #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 |
35 | #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 |
36 | #include <netinet/ip_icmp.h> |
49 | # include <netinet/ip_icmp.h> |
|
|
50 | #endif |
37 | |
51 | |
38 | #include "pidfile.h" |
52 | #include "pidfile.h" |
39 | |
53 | |
40 | #include "connection.h" |
54 | #include "connection.h" |
41 | #include "util.h" |
55 | #include "util.h" |
42 | #include "vpn.h" |
56 | #include "vpn.h" |
|
|
57 | |
|
|
58 | #if !defined(SOL_IP) && defined(IPPROTO_IP) |
|
|
59 | # define SOL_IP IPPROTO_IP |
|
|
60 | #endif |
43 | |
61 | |
44 | ///////////////////////////////////////////////////////////////////////////// |
62 | ///////////////////////////////////////////////////////////////////////////// |
45 | |
63 | |
46 | const char *vpn::script_if_up () |
64 | const char *vpn::script_if_up () |
47 | { |
65 | { |
… | |
… | |
81 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
99 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
82 | |
100 | |
83 | if (ipv4_fd < 0) |
101 | if (ipv4_fd < 0) |
84 | return -1; |
102 | return -1; |
85 | |
103 | |
86 | #ifdef IP_MTU_DISCOVER |
104 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
|
|
105 | |
|
|
106 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
87 | // this I really consider a linux bug. I am neither connected |
107 | // this I really consider a linux bug. I am neither connected |
88 | // 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 |
89 | // fragment for me sometimes. |
109 | // fragment for me sometimes. |
90 | { |
110 | { |
91 | int oval = IP_PMTUDISC_DONT; |
111 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
111 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
131 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
112 | |
132 | |
113 | if (udpv4_fd < 0) |
133 | if (udpv4_fd < 0) |
114 | return -1; |
134 | return -1; |
115 | |
135 | |
|
|
136 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
|
|
137 | |
116 | // standard daemon practise... |
138 | // standard daemon practise... |
117 | { |
139 | { |
118 | int oval = 1; |
140 | int oval = 1; |
119 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
141 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
120 | } |
142 | } |
121 | |
143 | |
122 | #ifdef IP_MTU_DISCOVER |
144 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
123 | // this I really consider a linux bug. I am neither connected |
145 | // this I really consider a linux bug. I am neither connected |
124 | // 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 |
125 | // fragment for me sometimes. |
147 | // fragment for me sometimes. |
126 | { |
148 | { |
127 | int oval = IP_PMTUDISC_DONT; |
149 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
148 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
170 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
149 | |
171 | |
150 | if (icmpv4_fd < 0) |
172 | if (icmpv4_fd < 0) |
151 | return -1; |
173 | return -1; |
152 | |
174 | |
|
|
175 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
|
|
176 | |
153 | #ifdef ICMP_FILTER |
177 | #ifdef ICMP_FILTER |
154 | { |
178 | { |
155 | icmp_filter oval; |
179 | icmp_filter oval; |
156 | oval.data = 0xffffffff; |
180 | oval.data = 0xffffffff; |
157 | if (::conf.icmp_type < 32) |
181 | if (::conf.icmp_type < 32) |
… | |
… | |
159 | |
183 | |
160 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
184 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
161 | } |
185 | } |
162 | #endif |
186 | #endif |
163 | |
187 | |
164 | #ifdef IP_MTU_DISCOVER |
188 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
165 | // this I really consider a linux bug. I am neither connected |
189 | // this I really consider a linux bug. I am neither connected |
166 | // 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 |
167 | // fragment for me sometimes. |
191 | // fragment for me sometimes. |
168 | { |
192 | { |
169 | int oval = IP_PMTUDISC_DONT; |
193 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
191 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
215 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
192 | |
216 | |
193 | if (tcpv4_fd < 0) |
217 | if (tcpv4_fd < 0) |
194 | return -1; |
218 | return -1; |
195 | |
219 | |
|
|
220 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
|
|
221 | |
196 | // standard daemon practise... |
222 | // standard daemon practise... |
197 | { |
223 | { |
198 | int oval = 1; |
224 | int oval = 1; |
199 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
225 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
200 | } |
226 | } |
… | |
… | |
262 | } |
288 | } |
263 | |
289 | |
264 | bool |
290 | bool |
265 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
291 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
266 | { |
292 | { |
|
|
293 | #if defined(SOL_IP) && defined(IP_TOS) |
267 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
294 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
295 | #endif |
268 | 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 ()); |
269 | |
297 | |
270 | return true; |
298 | return true; |
271 | } |
299 | } |
272 | |
300 | |
… | |
… | |
291 | sum += (sum >> 16); // carry |
319 | sum += (sum >> 16); // carry |
292 | |
320 | |
293 | return ~sum; |
321 | return ~sum; |
294 | } |
322 | } |
295 | |
323 | |
|
|
324 | #if ENABLE_ICMP |
|
|
325 | struct 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 | |
296 | bool |
342 | bool |
297 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
343 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
298 | { |
344 | { |
|
|
345 | #if defined(SOL_IP) && defined(IP_TOS) |
299 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
346 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
347 | #endif |
300 | |
348 | |
301 | pkt->unshift_hdr (4); |
349 | pkt->unshift_hdr (4); |
302 | |
350 | |
303 | icmphdr *hdr = (icmphdr *)&((*pkt)[0]); |
351 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
304 | hdr->type = ::conf.icmp_type; |
352 | hdr->type = ::conf.icmp_type; |
305 | hdr->code = 255; |
353 | hdr->code = 255; |
306 | hdr->checksum = 0; |
354 | hdr->checksum = 0; |
307 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
355 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
308 | |
356 | |
309 | 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 ()); |
310 | |
358 | |
311 | return true; |
359 | return true; |
312 | } |
360 | } |
|
|
361 | #endif |
313 | |
362 | |
314 | bool |
363 | bool |
315 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
364 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
316 | { |
365 | { |
|
|
366 | #if defined(SOL_IP) && defined(IP_TOS) |
317 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
367 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
368 | #endif |
318 | 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 ()); |
319 | |
370 | |
320 | return true; |
371 | return true; |
321 | } |
372 | } |
322 | |
373 | |
… | |
… | |
339 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
390 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
340 | else |
391 | else |
341 | { |
392 | { |
342 | connection *c = conns[src - 1]; |
393 | connection *c = conns[src - 1]; |
343 | |
394 | |
344 | if (dst == 0 && !THISNODE->routerprio) |
395 | if (dst == 0) |
345 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
396 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
346 | c->conf->nodename, (const char *)rsi); |
397 | c->conf->nodename, (const char *)rsi); |
347 | else if (dst != 0 && dst != THISNODE->id) |
398 | else if (dst != 0 && dst != THISNODE->id) |
348 | { |
399 | { |
349 | if (THISNODE->routerprio) |
400 | if (THISNODE->routerprio) |
350 | // the tos setting gets lost here. who cares. |
401 | // the tos setting gets lost here. who cares. |
… | |
… | |
405 | revents); |
456 | revents); |
406 | exit (1); |
457 | exit (1); |
407 | } |
458 | } |
408 | } |
459 | } |
409 | |
460 | |
|
|
461 | #if ENABLE_ICMP |
410 | void |
462 | void |
411 | vpn::icmpv4_ev (io_watcher &w, short revents) |
463 | vpn::icmpv4_ev (io_watcher &w, short revents) |
412 | { |
464 | { |
413 | if (revents & (POLLIN | POLLERR)) |
465 | if (revents & (POLLIN | POLLERR)) |
414 | { |
466 | { |
… | |
… | |
423 | |
475 | |
424 | if (len > 0) |
476 | if (len > 0) |
425 | { |
477 | { |
426 | pkt->len = len; |
478 | pkt->len = len; |
427 | |
479 | |
428 | icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); |
480 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
429 | |
481 | |
430 | if (hdr->type == ::conf.icmp_type |
482 | if (hdr->type == ::conf.icmp_type |
431 | && hdr->code == 255) |
483 | && hdr->code == 255) |
432 | { |
484 | { |
433 | // 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 |
… | |
… | |
457 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
509 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
458 | revents); |
510 | revents); |
459 | exit (1); |
511 | exit (1); |
460 | } |
512 | } |
461 | } |
513 | } |
|
|
514 | #endif |
462 | |
515 | |
463 | void |
516 | void |
464 | vpn::udpv4_ev (io_watcher &w, short revents) |
517 | vpn::udpv4_ev (io_watcher &w, short revents) |
465 | { |
518 | { |
466 | if (revents & (POLLIN | POLLERR)) |
519 | if (revents & (POLLIN | POLLERR)) |
… | |
… | |
516 | int dst = mac2id (pkt->dst); |
569 | int dst = mac2id (pkt->dst); |
517 | int src = mac2id (pkt->src); |
570 | int src = mac2id (pkt->src); |
518 | |
571 | |
519 | if (src != THISNODE->id) |
572 | if (src != THISNODE->id) |
520 | { |
573 | { |
521 | 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.")); |
522 | exit (1); |
575 | exit (1); |
523 | } |
576 | } |
524 | |
577 | |
525 | if (dst == THISNODE->id) |
578 | if (dst == THISNODE->id) |
526 | { |
579 | { |
527 | 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.")); |
528 | exit (1); |
581 | exit (1); |
529 | } |
582 | } |
530 | |
583 | |
531 | if (dst > conns.size ()) |
584 | if (dst > conns.size ()) |
532 | 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); |
… | |
… | |
538 | if (dst != THISNODE->id) |
591 | if (dst != THISNODE->id) |
539 | conns[dst - 1]->inject_data_packet (pkt); |
592 | conns[dst - 1]->inject_data_packet (pkt); |
540 | } |
593 | } |
541 | else |
594 | else |
542 | { |
595 | { |
543 | // broadcast, first check router, then self, then english |
596 | // broadcast, this is ugly, but due to the security policy |
544 | connection *router = find_router (); |
597 | // we have to connect to all hosts... |
545 | |
|
|
546 | if (router) |
|
|
547 | router->inject_data_packet (pkt, true); |
|
|
548 | else |
|
|
549 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
598 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
550 | if ((*c)->conf != THISNODE) |
599 | if ((*c)->conf != THISNODE) |
551 | (*c)->inject_data_packet (pkt); |
600 | (*c)->inject_data_packet (pkt); |
552 | } |
601 | } |
553 | } |
602 | } |
554 | |
603 | |
555 | delete pkt; |
604 | delete pkt; |
556 | } |
605 | } |
… | |
… | |
623 | } |
672 | } |
624 | } |
673 | } |
625 | |
674 | |
626 | connection *vpn::find_router () |
675 | connection *vpn::find_router () |
627 | { |
676 | { |
628 | u32 prio = 0; |
677 | u32 prio = 1; |
629 | connection *router = 0; |
678 | connection *router = 0; |
630 | |
679 | |
631 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
680 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
632 | { |
681 | { |
633 | connection *c = *i; |
682 | connection *c = *i; |
634 | |
683 | |
635 | if (c->conf->routerprio > prio |
684 | if (c->conf->routerprio > prio |
636 | && c->connectmode == conf_node::C_ALWAYS |
685 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
637 | && c->conf != THISNODE |
|
|
638 | && c->ictx && c->octx) |
686 | && c->ictx && c->octx |
|
|
687 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
639 | { |
688 | { |
640 | prio = c->conf->routerprio; |
689 | prio = c->conf->routerprio; |
641 | router = c; |
690 | router = c; |
642 | } |
691 | } |
643 | } |
692 | } |
… | |
… | |
652 | if (c) |
701 | if (c) |
653 | c->send_connect_request (id); |
702 | c->send_connect_request (id); |
654 | else |
703 | else |
655 | // no router found, aggressively connect to all routers |
704 | // no router found, aggressively connect to all routers |
656 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
705 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
657 | if ((*i)->conf->routerprio) |
706 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
658 | (*i)->establish_connection (); |
707 | (*i)->establish_connection (); |
659 | } |
708 | } |
660 | |
709 | |
661 | void |
710 | void |
662 | connection::dump_status () |
711 | connection::dump_status () |