| 1 | /* |
1 | /* |
| 2 | vpn_dns.C -- handle the dns tunnel part of the protocol. |
2 | vpn_dns.C -- handle the dns tunnel part of the protocol. |
| 3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
| 4 | |
4 | |
| 5 | This file is part of GVPE. |
5 | This file is part of GVPE. |
| 6 | |
6 | |
| 7 | GVPE is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
| 8 | it under the terms of the GNU General Public License as published by |
8 | under the terms of the GNU General Public License as published by the |
| 9 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
| 10 | (at your option) any later version. |
10 | option) any later version. |
| 11 | |
11 | |
| 12 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, but |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
| 15 | GNU General Public License for more details. |
15 | Public License for more details. |
| 16 | |
16 | |
| 17 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License along |
| 18 | along with gvpe; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
| 19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 | |
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20 | Additional permission under GNU GPL version 3 section 7 |
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21 | |
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22 | If you modify this Program, or any covered work, by linking or |
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23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
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24 | version of that library), containing parts covered by the terms of the |
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25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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26 | additional permission to convey the resulting work. Corresponding |
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27 | Source for a non-source form of such a combination shall include the |
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28 | source code for the parts of OpenSSL used as well as that of the |
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29 | covered work. |
| 20 | */ |
30 | */ |
| 21 | |
31 | |
| 22 | // TODO: EDNS0 option to increase dns mtu? |
32 | // TODO: EDNS0 option to increase dns mtu? |
| 23 | // TODO: re-write dns packet parsing/creation using a safe mem-buffer |
33 | // TODO: re-write dns packet parsing/creation using a safe mem-buffer |
| 24 | // to ensure no buffer overflows or similar problems. |
34 | // to ensure no buffer overflows or similar problems. |
| … | |
… | |
| 73 | #define MAX_PKT_SIZE 512 |
83 | #define MAX_PKT_SIZE 512 |
| 74 | |
84 | |
| 75 | #define RR_TYPE_A 1 |
85 | #define RR_TYPE_A 1 |
| 76 | #define RR_TYPE_NULL 10 |
86 | #define RR_TYPE_NULL 10 |
| 77 | #define RR_TYPE_TXT 16 |
87 | #define RR_TYPE_TXT 16 |
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88 | #define RR_TYPE_AAAA 28 |
| 78 | #define RR_TYPE_ANY 255 |
89 | #define RR_TYPE_ANY 255 |
| 79 | |
90 | |
| 80 | #define RR_CLASS_IN 1 |
91 | #define RR_CLASS_IN 1 |
| 81 | |
92 | |
| 82 | #define CMD_IP_1 207 |
93 | #define CMD_IP_1 207 |
| … | |
… | |
| 560 | vector<dns_rcv *> rcvpq; |
571 | vector<dns_rcv *> rcvpq; |
| 561 | |
572 | |
| 562 | byte_stream rcvdq; int rcvseq; int repseq; |
573 | byte_stream rcvdq; int rcvseq; int repseq; |
| 563 | byte_stream snddq; int sndseq; |
574 | byte_stream snddq; int sndseq; |
| 564 | |
575 | |
| 565 | void time_cb (ev::timer &w, int revents); ev::timer tw; |
576 | inline void time_cb (ev::timer &w, int revents); ev::timer tw; |
| 566 | void receive_rep (dns_rcv *r); |
577 | void receive_rep (dns_rcv *r); |
| 567 | |
578 | |
| 568 | dns_connection (connection *c); |
579 | dns_connection (connection *c); |
| 569 | ~dns_connection (); |
580 | ~dns_connection (); |
| 570 | }; |
581 | }; |
| … | |
… | |
| 725 | |
736 | |
| 726 | dns_connection::dns_connection (connection *c) |
737 | dns_connection::dns_connection (connection *c) |
| 727 | : c (c) |
738 | : c (c) |
| 728 | , rcvdq (MAX_BACKLOG * 2) |
739 | , rcvdq (MAX_BACKLOG * 2) |
| 729 | , snddq (MAX_BACKLOG) |
740 | , snddq (MAX_BACKLOG) |
| 730 | , tw (this, &dns_connection::time_cb) |
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| 731 | { |
741 | { |
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742 | tw.set<dns_connection, &dns_connection::time_cb> (this); |
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743 | |
| 732 | vpn = c->vpn; |
744 | vpn = c->vpn; |
| 733 | |
745 | |
| 734 | established = false; |
746 | established = false; |
| 735 | |
747 | |
| 736 | rcvseq = repseq = sndseq = 0; |
748 | rcvseq = repseq = sndseq = 0; |
