… | |
… | |
60 | |
60 | |
61 | static const rsachallenge & |
61 | static const rsachallenge & |
62 | challenge_bytes () |
62 | challenge_bytes () |
63 | { |
63 | { |
64 | static rsachallenge challenge; |
64 | static rsachallenge challenge; |
65 | static time_t challenge_ttl; // time this challenge needs to be recreated |
65 | static double challenge_ttl; // time this challenge needs to be recreated |
66 | |
66 | |
67 | if (now > challenge_ttl) |
67 | if (NOW > challenge_ttl) |
68 | { |
68 | { |
69 | RAND_bytes ((unsigned char *)&challenge, sizeof (challenge)); |
69 | RAND_bytes ((unsigned char *)&challenge, sizeof (challenge)); |
70 | challenge_ttl = now + CHALLENGE_TTL; |
70 | challenge_ttl = NOW + CHALLENGE_TTL; |
71 | } |
71 | } |
72 | |
72 | |
73 | return challenge; |
73 | return challenge; |
74 | } |
74 | } |
75 | |
75 | |
… | |
… | |
128 | |
128 | |
129 | crypto_ctx::~crypto_ctx () |
129 | crypto_ctx::~crypto_ctx () |
130 | { |
130 | { |
131 | EVP_CIPHER_CTX_cleanup (&cctx); |
131 | EVP_CIPHER_CTX_cleanup (&cctx); |
132 | HMAC_CTX_cleanup (&hctx); |
132 | HMAC_CTX_cleanup (&hctx); |
|
|
133 | } |
|
|
134 | |
|
|
135 | ////////////////////////////////////////////////////////////////////////////// |
|
|
136 | |
|
|
137 | void pkt_queue::put (tap_packet *p) |
|
|
138 | { |
|
|
139 | if (queue[i]) |
|
|
140 | { |
|
|
141 | delete queue[i]; |
|
|
142 | j = (j + 1) % QUEUEDEPTH; |
|
|
143 | } |
|
|
144 | |
|
|
145 | queue[i] = p; |
|
|
146 | |
|
|
147 | i = (i + 1) % QUEUEDEPTH; |
|
|
148 | } |
|
|
149 | |
|
|
150 | tap_packet *pkt_queue::get () |
|
|
151 | { |
|
|
152 | tap_packet *p = queue[j]; |
|
|
153 | |
|
|
154 | if (p) |
|
|
155 | { |
|
|
156 | queue[j] = 0; |
|
|
157 | j = (j + 1) % QUEUEDEPTH; |
|
|
158 | } |
|
|
159 | |
|
|
160 | return p; |
|
|
161 | } |
|
|
162 | |
|
|
163 | pkt_queue::pkt_queue () |
|
|
164 | { |
|
|
165 | memset (queue, 0, sizeof (queue)); |
|
|
166 | i = 0; |
|
|
167 | j = 0; |
|
|
168 | } |
|
|
169 | |
|
|
170 | pkt_queue::~pkt_queue () |
|
|
171 | { |
|
|
172 | for (i = QUEUEDEPTH; --i > 0; ) |
|
|
173 | delete queue[i]; |
|
|
174 | } |
|
|
175 | |
|
|
176 | // only do action once every x seconds per host. |
|
|
177 | // currently this is quite a slow implementation, |
|
|
178 | // but suffices for normal operation. |
|
|
179 | struct u32_rate_limiter : private map<u32, tstamp> |
|
|
180 | { |
|
|
181 | tstamp every; |
|
|
182 | |
|
|
183 | bool can (u32 host); |
|
|
184 | |
|
|
185 | u32_rate_limiter (tstamp every = 1) |
|
|
186 | { |
|
|
187 | this->every = every; |
|
|
188 | } |
|
|
189 | }; |
|
|
190 | |
|
|
191 | struct net_rate_limiter : u32_rate_limiter |
|
|
192 | { |
|
|
193 | bool can (SOCKADDR *sa) { return u32_rate_limiter::can((u32)sa->sin_addr.s_addr); } |
|
|
194 | bool can (sockinfo &si) { return u32_rate_limiter::can((u32)si.host); } |
|
|
195 | |
|
|
196 | net_rate_limiter (tstamp every) : u32_rate_limiter (every) {} |
|
|
197 | }; |
|
|
198 | |
|
|
199 | bool u32_rate_limiter::can (u32 host) |
|
|
200 | { |
|
|
201 | iterator i; |
|
|
202 | |
|
|
203 | for (i = begin (); i != end (); ) |
|
|
204 | if (i->second <= NOW) |
|
|
205 | { |
|
|
206 | erase (i); |
|
|
207 | i = begin (); |
|
|
208 | } |
|
|
209 | else |
|
|
210 | ++i; |
|
|
211 | |
|
|
212 | i = find (host); |
|
|
213 | |
|
|
214 | if (i != end ()) |
|
|
215 | return false; |
|
|
216 | |
|
|
217 | insert (value_type (host, NOW + every)); |
|
|
218 | |
|
|
219 | return true; |
133 | } |
220 | } |
134 | |
221 | |
135 | ///////////////////////////////////////////////////////////////////////////// |
222 | ///////////////////////////////////////////////////////////////////////////// |
136 | |
223 | |
137 | static void next_wakeup (time_t next) |
224 | static void next_wakeup (time_t next) |
… | |
… | |
200 | |
287 | |
201 | unsigned int src () |
288 | unsigned int src () |
202 | { |
289 | { |
203 | return src1 | ((srcdst >> 4) << 8); |
290 | return src1 | ((srcdst >> 4) << 8); |
204 | } |
291 | } |
|
|
292 | |
205 | unsigned int dst () |
293 | unsigned int dst () |
206 | { |
294 | { |
207 | return dst1 | ((srcdst & 0xf) << 8); |
295 | return dst1 | ((srcdst & 0xf) << 8); |
208 | } |
296 | } |
|
|
297 | |
209 | ptype typ () |
298 | ptype typ () |
210 | { |
299 | { |
211 | return (ptype) type; |
300 | return (ptype) type; |
212 | } |
301 | } |
213 | }; |
302 | }; |
… | |
… | |
252 | u32 cl; |
341 | u32 cl; |
253 | |
342 | |
254 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
343 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
255 | if (cl) |
344 | if (cl) |
256 | { |
345 | { |
257 | //printf ("compressed packet, %d => %d\n", l, cl);//D |
|
|
258 | type = PT_DATA_COMPRESSED; |
346 | type = PT_DATA_COMPRESSED; |
259 | d = cdata; |
347 | d = cdata; |
260 | l = cl + 2; |
348 | l = cl + 2; |
261 | |
349 | |
262 | d[0] = cl >> 8; |
350 | d[0] = cl >> 8; |
… | |
… | |
338 | #if ENABLE_COMPRESSION |
426 | #if ENABLE_COMPRESSION |
339 | if (type == PT_DATA_COMPRESSED) |
427 | if (type == PT_DATA_COMPRESSED) |
340 | { |
428 | { |
341 | u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
429 | u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
342 | p->len = lzf_decompress (d + DATAHDR + 2, cl, &(*p)[6 + 6], MAX_MTU) + 6 + 6; |
430 | p->len = lzf_decompress (d + DATAHDR + 2, cl, &(*p)[6 + 6], MAX_MTU) + 6 + 6; |
343 | //printf ("decompressxed %d(%d) => %d\n", cl, len - data_hdr_size (), p->len);//D |
|
|
344 | } |
431 | } |
345 | else |
432 | else |
346 | p->len = outl + (6 + 6 - DATAHDR); |
433 | p->len = outl + (6 + 6 - DATAHDR); |
347 | #endif |
434 | #endif |
348 | |
435 | |
… | |
… | |
369 | u32 digest_nid; |
456 | u32 digest_nid; |
370 | |
457 | |
371 | const u8 curflags () const |
458 | const u8 curflags () const |
372 | { |
459 | { |
373 | return 0x80 |
460 | return 0x80 |
|
|
461 | | 0x02 |
|
|
462 | #if PROTOCOL_MAJOR != 2 |
|
|
463 | #error hi |
|
|
464 | #endif |
374 | | (ENABLE_COMPRESSION ? 0x01 : 0x00) |
465 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
375 | | (ENABLE_TRUST ? 0x02 : 0x00); |
|
|
376 | } |
466 | } |
377 | |
467 | |
378 | void setup (ptype type, int dst) |
468 | void setup (ptype type, int dst) |
379 | { |
469 | { |
380 | prot_major = PROTOCOL_MAJOR; |
470 | prot_major = PROTOCOL_MAJOR; |
… | |
… | |
523 | |
613 | |
524 | if (subtype != AUTH_INIT || limiter.can (sa)) |
614 | if (subtype != AUTH_INIT || limiter.can (sa)) |
525 | { |
615 | { |
526 | auth_packet *pkt = new auth_packet (conf->id, subtype); |
616 | auth_packet *pkt = new auth_packet (conf->id, subtype); |
527 | |
617 | |
528 | //printf ("send auth_packet subtype %d\n", subtype);//D |
|
|
529 | |
|
|
530 | if (!k) |
618 | if (!k) |
531 | k = gen_challenge (sa); |
619 | k = gen_challenge (sa); |
532 | |
620 | |
533 | #if ENABLE_TRUST |
|
|
534 | if (0 > RSA_public_encrypt (sizeof (*k), |
621 | if (0 > RSA_public_encrypt (sizeof (*k), |
535 | (unsigned char *)k, (unsigned char *)&pkt->challenge, |
622 | (unsigned char *)k, (unsigned char *)&pkt->challenge, |
536 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
623 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
537 | fatal ("RSA_public_encrypt error"); |
624 | fatal ("RSA_public_encrypt error"); |
538 | #else |
|
|
539 | # error untrusted mode not yet implemented: programemr does not know how to |
|
|
540 | rsaencrdata enc; |
|
|
541 | |
|
|
542 | if (0 > RSA_private_encrypt (sizeof (*k), |
|
|
543 | (unsigned char *)k, (unsigned char *)&enc, |
|
|
544 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
545 | fatal ("RSA_private_encrypt error"); |
|
|
546 | |
|
|
547 | if (0 > RSA_public_encrypt (sizeof (enc), |
|
|
548 | (unsigned char *)enc, (unsigned char *)&pkt->challenge, |
|
|
549 | conf->rsa_key, RSA_NO_PADDING)) |
|
|
550 | fatal ("RSA_public_encrypt error"); |
|
|
551 | #endif |
|
|
552 | |
625 | |
553 | slog (L_TRACE, ">>%d PT_AUTH(%d) [%s]", conf->id, subtype, (const char *)sockinfo (sa)); |
626 | slog (L_TRACE, ">>%d PT_AUTH(%d) [%s]", conf->id, subtype, (const char *)sockinfo (sa)); |
554 | |
627 | |
555 | vpn->send_vpn_packet (pkt, sa, IPTOS_RELIABILITY); |
628 | vpn->send_vpn_packet (pkt, sa, IPTOS_RELIABILITY); |
556 | |
629 | |
557 | delete pkt; |
630 | delete pkt; |
558 | } |
631 | } |
559 | } |
632 | } |
560 | |
633 | |
561 | void |
634 | void |
562 | connection::establish_connection () |
635 | connection::establish_connection_cb (tstamp &ts) |
563 | { |
636 | { |
564 | if (!ictx && conf != THISNODE && connectmode != conf_node::C_NEVER) |
637 | if (ictx || conf == THISNODE || connectmode == conf_node::C_NEVER) |
|
|
638 | ts = TSTAMP_CANCEL; |
|
|
639 | else if (ts <= NOW) |
565 | { |
640 | { |
566 | if (now >= next_retry) |
641 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.25; |
|
|
642 | |
|
|
643 | if (retry_int < 3600 * 8) |
|
|
644 | retry_cnt++; |
|
|
645 | |
|
|
646 | if (connectmode == conf_node::C_ONDEMAND |
|
|
647 | && retry_int > ::conf.keepalive) |
|
|
648 | retry_int = ::conf.keepalive; |
|
|
649 | |
|
|
650 | ts = NOW + retry_int; |
|
|
651 | |
|
|
652 | if (conf->hostname) |
567 | { |
653 | { |
568 | int retry_int = retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2); |
|
|
569 | |
|
|
570 | if (retry_cnt < (17 << 2) | 3) |
|
|
571 | retry_cnt++; |
|
|
572 | |
|
|
573 | if (connectmode == conf_node::C_ONDEMAND |
|
|
574 | && retry_int > ::conf.keepalive) |
|
|
575 | retry_int = ::conf.keepalive; |
|
|
576 | |
|
|
577 | next_retry = now + retry_int; |
|
|
578 | next_wakeup (next_retry); |
|
|
579 | |
|
|
580 | if (conf->hostname) |
|
|
581 | { |
|
|
582 | reset_dstaddr (); |
654 | reset_dstaddr (); |
583 | if (sa.sin_addr.s_addr) |
655 | if (sa.sin_addr.s_addr) |
584 | if (retry_cnt < 4) |
656 | if (retry_cnt < 4) |
585 | send_auth (AUTH_INIT, &sa); |
657 | send_auth (AUTH_INIT, &sa); |
586 | else |
658 | else |
587 | send_ping (&sa, 0); |
659 | send_ping (&sa, 0); |
588 | } |
|
|
589 | else |
|
|
590 | vpn->connect_request (conf->id); |
|
|
591 | } |
660 | } |
|
|
661 | else |
|
|
662 | vpn->connect_request (conf->id); |
592 | } |
663 | } |
593 | } |
664 | } |
594 | |
665 | |
595 | void |
666 | void |
596 | connection::reset_connection () |
667 | connection::reset_connection () |
… | |
… | |
610 | octx = 0; |
681 | octx = 0; |
611 | |
682 | |
612 | sa.sin_port = 0; |
683 | sa.sin_port = 0; |
613 | sa.sin_addr.s_addr = 0; |
684 | sa.sin_addr.s_addr = 0; |
614 | |
685 | |
615 | next_retry = 0; |
|
|
616 | next_rekey = 0; |
|
|
617 | last_activity = 0; |
686 | last_activity = 0; |
|
|
687 | |
|
|
688 | rekey.reset (); |
|
|
689 | keepalive.reset (); |
|
|
690 | establish_connection.reset (); |
618 | } |
691 | } |
619 | |
692 | |
620 | void |
693 | void |
621 | connection::shutdown () |
694 | connection::shutdown () |
622 | { |
695 | { |
… | |
… | |
625 | |
698 | |
626 | reset_connection (); |
699 | reset_connection (); |
627 | } |
700 | } |
628 | |
701 | |
629 | void |
702 | void |
630 | connection::rekey () |
703 | connection::rekey_cb (tstamp &ts) |
631 | { |
704 | { |
|
|
705 | ts = TSTAMP_CANCEL; |
|
|
706 | |
632 | reset_connection (); |
707 | reset_connection (); |
633 | establish_connection (); |
708 | establish_connection (); |
634 | } |
709 | } |
635 | |
710 | |
636 | void |
711 | void |
… | |
… | |
668 | } |
743 | } |
669 | |
744 | |
670 | void |
745 | void |
671 | connection::recv_vpn_packet (vpn_packet *pkt, SOCKADDR *ssa) |
746 | connection::recv_vpn_packet (vpn_packet *pkt, SOCKADDR *ssa) |
672 | { |
747 | { |
673 | last_activity = now; |
748 | last_activity = NOW; |
674 | |
749 | |
675 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
750 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
676 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
751 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
677 | |
752 | |
678 | switch (pkt->typ ()) |
753 | switch (pkt->typ ()) |
… | |
… | |
686 | // so reset the retry counter and establish a conenction |
761 | // so reset the retry counter and establish a conenction |
687 | // when we receive a pong. |
762 | // when we receive a pong. |
688 | if (!ictx && !octx) |
763 | if (!ictx && !octx) |
689 | { |
764 | { |
690 | retry_cnt = 0; |
765 | retry_cnt = 0; |
691 | next_retry = 0; |
766 | establish_connection.at = 0; |
692 | establish_connection (); |
767 | establish_connection (); |
693 | } |
768 | } |
694 | |
769 | |
695 | break; |
770 | break; |
696 | |
771 | |
697 | case vpn_packet::PT_RESET: |
772 | case vpn_packet::PT_RESET: |
698 | { |
773 | { |
699 | reset_connection (); |
774 | reset_connection (); |
700 | |
775 | |
701 | config_packet *p = (config_packet *) pkt; |
776 | config_packet *p = (config_packet *) pkt; |
702 | if (p->chk_config ()) |
777 | if (!p->chk_config ()) |
|
|
778 | { |
|
|
779 | slog (L_WARN, _("disabling node '%s' because of differing protocol"), conf->nodename); |
|
|
780 | connectmode = conf_node::C_NEVER; |
|
|
781 | } |
703 | if (connectmode == conf_node::C_ALWAYS) |
782 | else if (connectmode == conf_node::C_ALWAYS) |
704 | establish_connection (); |
783 | establish_connection (); |
705 | |
|
|
706 | //D slog the protocol mismatch? |
|
|
707 | } |
784 | } |
708 | break; |
785 | break; |
709 | |
786 | |
710 | case vpn_packet::PT_AUTH: |
787 | case vpn_packet::PT_AUTH: |
711 | { |
788 | { |
… | |
… | |
723 | if (p->subtype == AUTH_INIT) |
800 | if (p->subtype == AUTH_INIT) |
724 | send_auth (AUTH_INITREPLY, ssa); |
801 | send_auth (AUTH_INITREPLY, ssa); |
725 | |
802 | |
726 | rsachallenge k; |
803 | rsachallenge k; |
727 | |
804 | |
728 | #if ENABLE_TRUST |
|
|
729 | if (0 > RSA_private_decrypt (sizeof (rsaencrdata), |
805 | if (0 > RSA_private_decrypt (sizeof (rsaencrdata), |
730 | (unsigned char *)&p->challenge, (unsigned char *)&k, |
806 | (unsigned char *)&p->challenge, (unsigned char *)&k, |
731 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
807 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
732 | // continued below |
|
|
733 | #else |
|
|
734 | rsaencrdata j; |
|
|
735 | |
|
|
736 | if (0 > RSA_private_decrypt (sizeof (rsaencrdata), |
|
|
737 | (unsigned char *)&p->challenge, (unsigned char *)&j, |
|
|
738 | ::conf.rsa_key, RSA_NO_PADDING)) |
|
|
739 | fatal ("RSA_private_decrypt error"); |
|
|
740 | |
|
|
741 | if (0 > RSA_public_decrypt (sizeof (k), |
|
|
742 | (unsigned char *)&j, (unsigned char *)&k, |
|
|
743 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
744 | // continued below |
|
|
745 | #endif |
|
|
746 | { |
808 | { |
747 | slog (L_ERR, _("challenge from %s (%s) illegal or corrupted"), |
809 | slog (L_ERR, _("challenge from %s (%s) illegal or corrupted"), |
748 | conf->nodename, (const char *)sockinfo (ssa)); |
810 | conf->nodename, (const char *)sockinfo (ssa)); |
749 | break; |
811 | break; |
750 | } |
812 | } |
751 | |
813 | |
752 | retry_cnt = 0; |
814 | retry_cnt = 0; |
753 | next_retry = now + 8; |
815 | establish_connection.set (NOW + 8); //? ;) |
|
|
816 | keepalive.reset (); |
|
|
817 | rekey.reset (); |
754 | |
818 | |
755 | switch (p->subtype) |
819 | switch (p->subtype) |
756 | { |
820 | { |
757 | case AUTH_INIT: |
821 | case AUTH_INIT: |
758 | case AUTH_INITREPLY: |
822 | case AUTH_INITREPLY: |
… | |
… | |
777 | ictx = new crypto_ctx (k, 0); |
841 | ictx = new crypto_ctx (k, 0); |
778 | iseqno.reset (*(u32 *)&k[CHG_SEQNO] & 0x7fffffff); // at least 2**31 sequence numbers are valid |
842 | iseqno.reset (*(u32 *)&k[CHG_SEQNO] & 0x7fffffff); // at least 2**31 sequence numbers are valid |
779 | |
843 | |
780 | sa = *ssa; |
844 | sa = *ssa; |
781 | |
845 | |
782 | next_rekey = now + ::conf.rekey; |
846 | rekey.set (NOW + ::conf.rekey); |
783 | next_wakeup (next_rekey); |
847 | keepalive.set (NOW + ::conf.keepalive); |
784 | |
848 | |
785 | // send queued packets |
849 | // send queued packets |
786 | while (tap_packet *p = queue.get ()) |
850 | while (tap_packet *p = queue.get ()) |
787 | { |
851 | { |
788 | send_data_packet (p); |
852 | send_data_packet (p); |
… | |
… | |
929 | send_reset (ssa); |
993 | send_reset (ssa); |
930 | break; |
994 | break; |
931 | } |
995 | } |
932 | } |
996 | } |
933 | |
997 | |
934 | void connection::timer () |
998 | void connection::keepalive_cb (tstamp &ts) |
935 | { |
999 | { |
936 | if (conf != THISNODE) |
1000 | if (NOW >= last_activity + ::conf.keepalive + 30) |
937 | { |
1001 | { |
938 | if (now >= next_retry && connectmode == conf_node::C_ALWAYS) |
1002 | reset_connection (); |
939 | establish_connection (); |
1003 | establish_connection (); |
940 | |
1004 | } |
941 | if (ictx && octx) |
|
|
942 | { |
|
|
943 | if (now >= next_rekey) |
|
|
944 | rekey (); |
|
|
945 | else if (now >= last_activity + ::conf.keepalive + 30) |
|
|
946 | { |
|
|
947 | reset_connection (); |
|
|
948 | establish_connection (); |
|
|
949 | } |
|
|
950 | else if (now >= last_activity + ::conf.keepalive) |
1005 | else if (NOW < last_activity + ::conf.keepalive) |
|
|
1006 | ts = last_activity + ::conf.keepalive; |
951 | if (conf->connectmode != conf_node::C_ONDEMAND |
1007 | else if (conf->connectmode != conf_node::C_ONDEMAND |
952 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1008 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
|
|
1009 | { |
953 | send_ping (&sa); |
1010 | send_ping (&sa); |
954 | else |
1011 | ts = NOW + 5; |
|
|
1012 | } |
|
|
1013 | else |
955 | reset_connection (); |
1014 | reset_connection (); |
956 | |
1015 | |
957 | } |
|
|
958 | } |
|
|
959 | } |
1016 | } |
960 | |
1017 | |
961 | void connection::connect_request (int id) |
1018 | void connection::connect_request (int id) |
962 | { |
1019 | { |
963 | connect_req_packet *p = new connect_req_packet (conf->id, id); |
1020 | connect_req_packet *p = new connect_req_packet (conf->id, id); |
… | |
… | |
1000 | putenv ("STATE=down"); |
1057 | putenv ("STATE=down"); |
1001 | |
1058 | |
1002 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1059 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1003 | } |
1060 | } |
1004 | |
1061 | |
|
|
1062 | connection::connection(struct vpn *vpn_) |
|
|
1063 | : vpn(vpn_) |
|
|
1064 | , rekey (this, &connection::rekey_cb) |
|
|
1065 | , keepalive (this, &connection::keepalive_cb) |
|
|
1066 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1067 | { |
|
|
1068 | octx = ictx = 0; |
|
|
1069 | retry_cnt = 0; |
|
|
1070 | |
|
|
1071 | connectmode = conf_node::C_ALWAYS; // initial setting |
|
|
1072 | reset_connection (); |
|
|
1073 | } |
|
|
1074 | |
|
|
1075 | connection::~connection () |
|
|
1076 | { |
|
|
1077 | shutdown (); |
|
|
1078 | } |
|
|
1079 | |
1005 | ///////////////////////////////////////////////////////////////////////////// |
1080 | ///////////////////////////////////////////////////////////////////////////// |
1006 | |
|
|
1007 | vpn::vpn (void) |
|
|
1008 | {} |
|
|
1009 | |
1081 | |
1010 | const char *vpn::script_if_up () |
1082 | const char *vpn::script_if_up () |
1011 | { |
1083 | { |
1012 | // the tunnel device mtu should be the physical mtu - overhead |
1084 | // the tunnel device mtu should be the physical mtu - overhead |
1013 | // the tricky part is rounding to the cipher key blocksize |
1085 | // the tricky part is rounding to the cipher key blocksize |
… | |
… | |
1064 | { |
1136 | { |
1065 | int oval = 1; |
1137 | int oval = 1; |
1066 | setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
1138 | setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
1067 | } |
1139 | } |
1068 | |
1140 | |
|
|
1141 | udp_ev_watcher.start (socket_fd, POLLIN); |
|
|
1142 | |
1069 | tap = new tap_device (); |
1143 | tap = new tap_device (); |
1070 | if (!tap) //D this, of course, never catches |
1144 | if (!tap) //D this, of course, never catches |
1071 | { |
1145 | { |
1072 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
1146 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
1073 | exit (1); |
1147 | exit (1); |
1074 | } |
1148 | } |
1075 | |
1149 | |
1076 | run_script (this, &vpn::script_if_up, true); |
1150 | run_script (this, &vpn::script_if_up, true); |
|
|
1151 | |
|
|
1152 | vpn_ev_watcher.start (tap->fd, POLLIN); |
|
|
1153 | |
|
|
1154 | reconnect_all (); |
1077 | |
1155 | |
1078 | return 0; |
1156 | return 0; |
1079 | } |
1157 | } |
1080 | |
1158 | |
1081 | void |
1159 | void |
… | |
… | |
1146 | // if ((*i)->conf->routerprio) |
1224 | // if ((*i)->conf->routerprio) |
1147 | // (*i)->establish_connection (); |
1225 | // (*i)->establish_connection (); |
1148 | } |
1226 | } |
1149 | |
1227 | |
1150 | void |
1228 | void |
1151 | vpn::main_loop () |
1229 | vpn::udp_ev (short revents) |
1152 | { |
1230 | { |
1153 | struct pollfd pollfd[2]; |
1231 | if (revents & (POLLIN | POLLERR)) |
1154 | |
|
|
1155 | pollfd[0].fd = tap->fd; |
|
|
1156 | pollfd[0].events = POLLIN; |
|
|
1157 | pollfd[1].fd = socket_fd; |
|
|
1158 | pollfd[1].events = POLLIN; |
|
|
1159 | |
|
|
1160 | events = 0; |
|
|
1161 | now = time (0); |
|
|
1162 | next_timecheck = now + 1; |
|
|
1163 | |
|
|
1164 | reconnect_all (); |
|
|
1165 | |
|
|
1166 | for (;;) |
|
|
1167 | { |
1232 | { |
1168 | int npoll = poll (pollfd, 2, (next_timecheck - now) * 1000); |
1233 | vpn_packet *pkt = new vpn_packet; |
1169 | |
1234 | struct sockaddr_in sa; |
1170 | now = time (0); |
1235 | socklen_t sa_len = sizeof (sa); |
|
|
1236 | int len; |
1171 | |
1237 | |
|
|
1238 | len = recvfrom (socket_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
1239 | |
1172 | if (npoll > 0) |
1240 | if (len > 0) |
1173 | { |
1241 | { |
1174 | if (pollfd[1].revents) |
1242 | pkt->len = len; |
|
|
1243 | |
|
|
1244 | unsigned int src = pkt->src (); |
|
|
1245 | unsigned int dst = pkt->dst (); |
|
|
1246 | |
|
|
1247 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
|
|
1248 | (const char *)sockinfo (sa), pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
|
|
1249 | |
|
|
1250 | if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX) |
|
|
1251 | slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"), |
|
|
1252 | pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
1253 | else if (dst == 0 && !THISNODE->routerprio) |
|
|
1254 | slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst); |
|
|
1255 | else if (dst != 0 && dst != THISNODE->id) |
|
|
1256 | slog (L_WARN, |
|
|
1257 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
|
|
1258 | dst, conns[dst - 1]->conf->nodename, |
|
|
1259 | (const char *)sockinfo (sa), |
|
|
1260 | THISNODE->id, THISNODE->nodename); |
|
|
1261 | else if (src == 0 || src > conns.size ()) |
|
|
1262 | slog (L_WARN, _("received frame from unknown node %d (%s)"), src, (const char *)sockinfo (sa)); |
|
|
1263 | else |
|
|
1264 | conns[src - 1]->recv_vpn_packet (pkt, &sa); |
|
|
1265 | } |
|
|
1266 | else |
|
|
1267 | { |
|
|
1268 | // probably ECONNRESET or somesuch |
|
|
1269 | slog (L_DEBUG, _("%s: %s"), (const char *)sockinfo(sa), strerror (errno)); |
|
|
1270 | } |
|
|
1271 | |
|
|
1272 | delete pkt; |
|
|
1273 | } |
|
|
1274 | else if (revents & POLLHUP) |
|
|
1275 | { |
|
|
1276 | // this cannot ;) happen on udp sockets |
|
|
1277 | slog (L_ERR, _("FATAL: POLLHUP on socket fd, terminating.")); |
|
|
1278 | exit (1); |
|
|
1279 | } |
|
|
1280 | else |
|
|
1281 | { |
|
|
1282 | slog (L_ERR, |
|
|
1283 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
1284 | revents); |
|
|
1285 | exit (1); |
|
|
1286 | } |
|
|
1287 | } |
|
|
1288 | |
|
|
1289 | void |
|
|
1290 | vpn::vpn_ev (short revents) |
|
|
1291 | { |
|
|
1292 | if (revents & POLLIN) |
|
|
1293 | { |
|
|
1294 | /* process data */ |
|
|
1295 | tap_packet *pkt; |
|
|
1296 | |
|
|
1297 | pkt = tap->recv (); |
|
|
1298 | |
|
|
1299 | int dst = mac2id (pkt->dst); |
|
|
1300 | int src = mac2id (pkt->src); |
|
|
1301 | |
|
|
1302 | if (src != THISNODE->id) |
|
|
1303 | { |
|
|
1304 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
1305 | exit (1); |
|
|
1306 | } |
|
|
1307 | |
|
|
1308 | if (dst == THISNODE->id) |
|
|
1309 | { |
|
|
1310 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
1311 | exit (1); |
|
|
1312 | } |
|
|
1313 | |
|
|
1314 | if (dst > conns.size ()) |
|
|
1315 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
1316 | else |
|
|
1317 | { |
|
|
1318 | if (dst) |
1175 | { |
1319 | { |
1176 | if (pollfd[1].revents & (POLLIN | POLLERR)) |
1320 | // unicast |
1177 | { |
|
|
1178 | vpn_packet *pkt = new vpn_packet; |
|
|
1179 | struct sockaddr_in sa; |
|
|
1180 | socklen_t sa_len = sizeof (sa); |
|
|
1181 | int len; |
|
|
1182 | |
|
|
1183 | len = recvfrom (socket_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
1184 | |
|
|
1185 | if (len > 0) |
|
|
1186 | { |
|
|
1187 | pkt->len = len; |
|
|
1188 | |
|
|
1189 | unsigned int src = pkt->src (); |
|
|
1190 | unsigned int dst = pkt->dst (); |
|
|
1191 | |
|
|
1192 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
|
|
1193 | (const char *)sockinfo (sa), pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
|
|
1194 | |
|
|
1195 | if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX) |
|
|
1196 | slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"), |
|
|
1197 | pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
1198 | else if (dst == 0 && !THISNODE->routerprio) |
|
|
1199 | slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst); |
|
|
1200 | else if (dst != 0 && dst != THISNODE->id) |
1321 | if (dst != THISNODE->id) |
1201 | slog (L_WARN, |
|
|
1202 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
|
|
1203 | dst, conns[dst - 1]->conf->nodename, |
|
|
1204 | (const char *)sockinfo (sa), |
|
|
1205 | THISNODE->id, THISNODE->nodename); |
|
|
1206 | else if (src == 0 || src > conns.size ()) |
|
|
1207 | slog (L_WARN, _("received frame from unknown node %d (%s)"), src, (const char *)sockinfo (sa)); |
|
|
1208 | else |
|
|
1209 | conns[src - 1]->recv_vpn_packet (pkt, &sa); |
1322 | conns[dst - 1]->inject_data_packet (pkt); |
1210 | } |
|
|
1211 | else |
|
|
1212 | { |
|
|
1213 | // probably ECONNRESET or somesuch |
|
|
1214 | slog (L_DEBUG, _("%s: %s"), (const char *)sockinfo(sa), strerror (errno)); |
|
|
1215 | } |
|
|
1216 | |
|
|
1217 | delete pkt; |
|
|
1218 | } |
1323 | } |
1219 | else if (pollfd[1].revents & POLLHUP) |
1324 | else |
1220 | { |
1325 | { |
1221 | // this cannot ;) happen on udp sockets |
1326 | // broadcast, first check router, then self, then english |
1222 | slog (L_ERR, _("FATAL: POLLHUP on socket fd, terminating.")); |
1327 | connection *router = find_router (); |
1223 | exit (1); |
1328 | |
1224 | } |
1329 | if (router) |
|
|
1330 | router->inject_data_packet (pkt, true); |
1225 | else |
1331 | else |
1226 | { |
|
|
1227 | slog (L_ERR, |
|
|
1228 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
1229 | pollfd[1].revents); |
|
|
1230 | exit (1); |
|
|
1231 | } |
|
|
1232 | } |
|
|
1233 | |
|
|
1234 | // I use else here to give vpn_packets absolute priority |
|
|
1235 | else if (pollfd[0].revents) |
|
|
1236 | { |
|
|
1237 | if (pollfd[0].revents & POLLIN) |
|
|
1238 | { |
|
|
1239 | /* process data */ |
|
|
1240 | tap_packet *pkt; |
|
|
1241 | |
|
|
1242 | pkt = tap->recv (); |
|
|
1243 | |
|
|
1244 | int dst = mac2id (pkt->dst); |
|
|
1245 | int src = mac2id (pkt->src); |
|
|
1246 | |
|
|
1247 | if (src != THISNODE->id) |
|
|
1248 | { |
|
|
1249 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
1250 | exit (1); |
|
|
1251 | } |
|
|
1252 | |
|
|
1253 | if (dst == THISNODE->id) |
|
|
1254 | { |
|
|
1255 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
1256 | exit (1); |
|
|
1257 | } |
|
|
1258 | |
|
|
1259 | if (dst > conns.size ()) |
|
|
1260 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
1261 | else |
|
|
1262 | { |
|
|
1263 | if (dst) |
|
|
1264 | { |
|
|
1265 | // unicast |
|
|
1266 | if (dst != THISNODE->id) |
|
|
1267 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
1268 | } |
|
|
1269 | else |
|
|
1270 | { |
|
|
1271 | // broadcast, first check router, then self, then english |
|
|
1272 | connection *router = find_router (); |
|
|
1273 | |
|
|
1274 | if (router) |
|
|
1275 | router->inject_data_packet (pkt, true); |
|
|
1276 | else |
|
|
1277 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
1332 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
1278 | if ((*c)->conf != THISNODE) |
1333 | if ((*c)->conf != THISNODE) |
1279 | (*c)->inject_data_packet (pkt); |
1334 | (*c)->inject_data_packet (pkt); |
1280 | } |
|
|
1281 | } |
|
|
1282 | |
|
|
1283 | delete pkt; |
|
|
1284 | } |
|
|
1285 | else if (pollfd[0].revents & (POLLHUP | POLLERR)) |
|
|
1286 | { |
|
|
1287 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
1288 | exit (1); |
|
|
1289 | } |
|
|
1290 | else |
|
|
1291 | abort (); |
|
|
1292 | } |
1335 | } |
1293 | } |
1336 | } |
1294 | |
1337 | |
|
|
1338 | delete pkt; |
|
|
1339 | } |
|
|
1340 | else if (revents & (POLLHUP | POLLERR)) |
|
|
1341 | { |
|
|
1342 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
1343 | exit (1); |
|
|
1344 | } |
|
|
1345 | else |
|
|
1346 | abort (); |
|
|
1347 | } |
|
|
1348 | |
|
|
1349 | void |
|
|
1350 | vpn::event_cb (tstamp &ts) |
|
|
1351 | { |
1295 | if (events) |
1352 | if (events) |
|
|
1353 | { |
|
|
1354 | if (events & EVENT_SHUTDOWN) |
1296 | { |
1355 | { |
1297 | if (events & EVENT_SHUTDOWN) |
|
|
1298 | { |
|
|
1299 | shutdown_all (); |
1356 | shutdown_all (); |
1300 | |
1357 | |
1301 | remove_pid (pidfilename); |
1358 | remove_pid (pidfilename); |
1302 | |
1359 | |
1303 | slog (L_INFO, _("vped terminating")); |
1360 | slog (L_INFO, _("vped terminating")); |
1304 | |
1361 | |
1305 | exit (0); |
1362 | exit (0); |
1306 | } |
|
|
1307 | |
|
|
1308 | if (events & EVENT_RECONNECT) |
|
|
1309 | reconnect_all (); |
|
|
1310 | |
|
|
1311 | events = 0; |
|
|
1312 | } |
1363 | } |
1313 | |
1364 | |
1314 | // very very very dumb and crude and inefficient timer handling, or maybe not? |
1365 | if (events & EVENT_RECONNECT) |
1315 | if (now >= next_timecheck) |
1366 | reconnect_all (); |
1316 | { |
|
|
1317 | next_timecheck = now + TIMER_GRANULARITY; |
|
|
1318 | |
1367 | |
1319 | for (conns_vector::iterator c = conns.begin (); |
1368 | events = 0; |
1320 | c != conns.end (); ++c) |
|
|
1321 | (*c)->timer (); |
|
|
1322 | } |
|
|
1323 | } |
1369 | } |
|
|
1370 | |
|
|
1371 | ts = TSTAMP_CANCEL; |
|
|
1372 | } |
|
|
1373 | |
|
|
1374 | vpn::vpn (void) |
|
|
1375 | : udp_ev_watcher (this, &vpn::udp_ev) |
|
|
1376 | , vpn_ev_watcher (this, &vpn::vpn_ev) |
|
|
1377 | , event (this, &vpn::event_cb) |
|
|
1378 | { |
1324 | } |
1379 | } |
1325 | |
1380 | |
1326 | vpn::~vpn () |
1381 | vpn::~vpn () |
1327 | {} |
1382 | { |
|
|
1383 | } |
1328 | |
1384 | |