1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
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3 | Copyright (C) 2003 Marc Lehmann <pcg@goof.com> |
3 | |
4 | |
4 | This program is free software; you can redistribute it and/or modify |
5 | This program is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
6 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
7 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
8 | (at your option) any later version. |
… | |
… | |
24 | #include <cstring> |
25 | #include <cstring> |
25 | #include <cstdio> |
26 | #include <cstdio> |
26 | |
27 | |
27 | #include <sys/types.h> |
28 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
29 | #include <sys/socket.h> |
29 | #include <sys/poll.h> |
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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> |
35 | #include <sys/socket.h> |
36 | #include <netinet/in.h> |
36 | |
37 | #include <arpa/inet.h> |
37 | #include "netcompat.h" |
38 | #include <net/if.h> |
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39 | #ifdef HAVE_NETINET_IN_SYSTM_H |
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40 | # include <netinet/in_systm.h> |
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41 | #endif |
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42 | #ifdef HAVE_NETINET_IP_H |
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43 | # include <netinet/ip.h> |
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44 | #endif |
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45 | #ifdef HAVE_NETINET_TCP_H |
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46 | # include <netinet/tcp.h> |
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47 | #endif |
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48 | #if ENABLE_ICMP |
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49 | # include <netinet/ip_icmp.h> |
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50 | #endif |
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51 | |
38 | |
52 | #include "pidfile.h" |
39 | #include "pidfile.h" |
53 | |
40 | |
54 | #include "connection.h" |
41 | #include "connection.h" |
55 | #include "util.h" |
42 | #include "util.h" |
56 | #include "vpn.h" |
43 | #include "vpn.h" |
57 | |
44 | |
58 | #if !defined(SOL_IP) && defined(IPPROTO_IP) |
45 | vpn network; // THE vpn (bad design...) |
59 | # define SOL_IP IPPROTO_IP |
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60 | #endif |
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61 | |
46 | |
62 | ///////////////////////////////////////////////////////////////////////////// |
47 | ///////////////////////////////////////////////////////////////////////////// |
63 | |
48 | |
64 | const char *vpn::script_if_up () |
49 | const char *vpn::script_if_up () |
65 | { |
50 | { |
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… | |
69 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
54 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
70 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
55 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
71 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
56 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
72 | |
57 | |
73 | char *env; |
58 | char *env; |
74 | asprintf (&env, "CONFBASE=%s", confbase); |
59 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
75 | putenv (env); |
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76 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
60 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
77 | putenv (env); |
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78 | asprintf (&env, "NODEID=%d", THISNODE->id); |
61 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
79 | putenv (env); |
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80 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
62 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
81 | putenv (env); |
63 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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64 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
82 | asprintf (&env, "MTU=%d", mtu); |
65 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
83 | putenv (env); |
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84 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
66 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
85 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
67 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
86 | THISNODE->id & 0xff); |
68 | THISNODE->id & 0xff); |
87 | putenv (env); |
69 | putenv (env); |
88 | |
70 | |
… | |
… | |
320 | |
302 | |
321 | return ~sum; |
303 | return ~sum; |
322 | } |
304 | } |
323 | |
305 | |
324 | #if ENABLE_ICMP |
306 | #if ENABLE_ICMP |
325 | struct icmp_header { |
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326 | u8 type; |
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327 | u8 code; |
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328 | u16 checksum; |
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329 | union { |
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330 | struct { |
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331 | u16 id; |
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332 | u16 sequence; |
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333 | } echo; |
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334 | u32 gateway; |
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335 | struct { |
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336 | u16 unused; |
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337 | u16 mtu; |
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338 | } frag; |
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339 | } un; |
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340 | }; |
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341 | |
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342 | bool |
307 | bool |
343 | 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) |
344 | { |
309 | { |
345 | #if defined(SOL_IP) && defined(IP_TOS) |
310 | #if defined(SOL_IP) && defined(IP_TOS) |
346 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
311 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
… | |
… | |
367 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
332 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
368 | #endif |
333 | #endif |
369 | 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 ()); |
370 | |
335 | |
371 | return true; |
336 | return true; |
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337 | } |
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338 | |
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339 | void |
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340 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
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341 | { |
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342 | if (dst) |
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343 | { |
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344 | // unicast |
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345 | if (dst != THISNODE->id) |
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346 | conns[dst - 1]->inject_data_packet (pkt); |
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347 | } |
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348 | else |
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349 | { |
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350 | // broadcast, this is ugly, but due to the security policy |
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351 | // we have to connect to all hosts... |
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352 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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353 | if ((*c)->conf != THISNODE) |
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354 | (*c)->inject_data_packet (pkt, true); |
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355 | } |
372 | } |
356 | } |
373 | |
357 | |
374 | void |
358 | void |
375 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
359 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
376 | { |
360 | { |
… | |
… | |
393 | connection *c = conns[src - 1]; |
377 | connection *c = conns[src - 1]; |
394 | |
378 | |
395 | if (dst == 0) |
379 | if (dst == 0) |
396 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
380 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
397 | c->conf->nodename, (const char *)rsi); |
381 | c->conf->nodename, (const char *)rsi); |
398 | else if (dst != 0 && dst != THISNODE->id) |
382 | else if (dst != THISNODE->id) |
399 | { |
383 | { |
400 | if (THISNODE->routerprio) |
384 | if (THISNODE->routerprio) |
401 | // the tos setting gets lost here. who cares. |
385 | // the tos setting gets lost here. who cares. |
402 | conns[dst - 1]->inject_vpn_packet (pkt); |
386 | conns[dst - 1]->inject_vpn_packet (pkt); |
403 | else |
387 | else |
… | |
… | |
564 | /* process data */ |
548 | /* process data */ |
565 | tap_packet *pkt; |
549 | tap_packet *pkt; |
566 | |
550 | |
567 | pkt = tap->recv (); |
551 | pkt = tap->recv (); |
568 | |
552 | |
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553 | if (!pkt) |
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554 | return; |
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555 | |
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556 | if (pkt->len > 14) |
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557 | { |
569 | int dst = mac2id (pkt->dst); |
558 | int dst = mac2id (pkt->dst); |
570 | int src = mac2id (pkt->src); |
559 | int src = mac2id (pkt->src); |
571 | |
560 | |
572 | if (src != THISNODE->id) |
561 | if (src != THISNODE->id) |
573 | { |
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574 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
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575 | exit (1); |
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576 | } |
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577 | |
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578 | if (dst == THISNODE->id) |
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579 | { |
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580 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
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581 | exit (1); |
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582 | } |
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583 | |
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584 | if (dst > conns.size ()) |
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585 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
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586 | else |
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587 | { |
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588 | if (dst) |
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589 | { |
562 | { |
590 | // unicast |
563 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
591 | if (dst != THISNODE->id) |
564 | exit (1); |
592 | conns[dst - 1]->inject_data_packet (pkt); |
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593 | } |
565 | } |
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566 | |
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567 | if (dst == THISNODE->id) |
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568 | { |
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569 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
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570 | exit (1); |
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571 | } |
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572 | |
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573 | if (dst > conns.size ()) |
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574 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
594 | else |
575 | else |
595 | { |
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596 | // broadcast, this is ugly, but due to the security policy |
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597 | // we have to connect to all hosts... |
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598 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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599 | if ((*c)->conf != THISNODE) |
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600 | (*c)->inject_data_packet (pkt); |
576 | inject_data_packet (pkt, dst); |
601 | } |
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602 | } |
577 | } |
603 | |
578 | |
604 | delete pkt; |
579 | delete pkt; |
605 | } |
580 | } |
606 | else if (revents & (POLLHUP | POLLERR)) |
581 | else if (revents & (POLLHUP | POLLERR)) |