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/* |
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global.h -- global variables and constants |
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Copyright (C) 2003-2013 Marc Lehmann <gvpe@schmorp.de> |
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This file is part of GVPE. |
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GVPE is free software; you can redistribute it and/or modify it |
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under the terms of the GNU General Public License as published by the |
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Free Software Foundation; either version 3 of the License, or (at your |
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option) any later version. |
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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Public License for more details. |
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|
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You should have received a copy of the GNU General Public License along |
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with this program; if not, see <http://www.gnu.org/licenses/>. |
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|
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Additional permission under GNU GPL version 3 section 7 |
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|
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If you modify this Program, or any covered work, by linking or |
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combining it with the OpenSSL project's OpenSSL library (or a modified |
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version of that library), containing parts covered by the terms of the |
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OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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additional permission to convey the resulting work. Corresponding |
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Source for a non-source form of such a combination shall include the |
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source code for the parts of OpenSSL used as well as that of the |
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covered work. |
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*/ |
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#ifndef GLOBAL_H__ |
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#define GLOBAL_H__ |
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#include "config.h" |
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#include <time.h> |
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/* Protocol version. Different major versions are incompatible, |
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* different minor versions probably are compatible ;) |
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*/ |
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#define PROTOCOL_MAJOR 0 |
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#define PROTOCOL_MINOR 1 |
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#define SEED_SIZE 64 // how many octets to seed rng with |
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#define RSA_KEYBITS 1280 // must be >= 1280 and divisible by 8 |
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#define RSA_KEYLEN ((RSA_KEYBITS) >> 3) |
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#define RSA_OVERHEAD (41 + 1) // well, no define for OAEP in openssl |
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#define RSA_HASH EVP_ripemd160 ()// speed don't matter, boy, safety does.. I need sha256 :( |
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#define RSA_HASHLEN (160 >> 3) |
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#define RSA_RESLEN RSA_HASHLEN |
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|
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#define RSA_IDLEN 16 // how many bytes are used to identify the challenge |
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#define RSA_TTL 120 // challenge bytes timeout after n seconds |
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#define CIPHER ENABLE_CIPHER () |
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#define CIPHER_KEYLEN (EVP_CIPHER_key_length (CIPHER)) |
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#define DIGEST ENABLE_DIGEST () |
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#define HMAC_KEYLEN (256 >> 3) // number of bits used for the HMAC key |
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#define WINDOWSIZE 512 // sliding window size |
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#define MAX_SEQNO (0xfffffff0U - WINDOWSIZE * 8) |
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#define CHG_SEQNO 0 // where the seqno starts within the rsa challenge |
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#define CHG_CIPHER_KEY (CHG_SEQNO + 4) // where the key starts within the rsa challenge |
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//#define CHG_HMAC_KEY (CHG_CIPHER_KEY + CIPHER_KEYLEN) // where the key starts within the rsa challenge |
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#define CHG_HMAC_KEY 86 // where the key starts within the rsa challenge |
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// 872 rsa bits used |
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|
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// hdr seq len hmac MAC MAC |
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#define VPE_OVERHEAD (4 + 4 + 4 + RAND_SIZE + HMACLENGTH - 6 - 6) |
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#define IP_OVERHEAD 20 // size of a (normal) ip header |
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#define GRE_OVERHEAD (IP_OVERHEAD + 4) |
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#define ICMP_OVERHEAD (IP_OVERHEAD + 4) |
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#define UDP_OVERHEAD (IP_OVERHEAD + 20) // size of a (normal) ip + udp header (wrong, but don't care) |
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#define TCP_OVERHEAD (IP_OVERHEAD + 22) // size of a (normal) ip + tcp header + packetlength |
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#define MAX_OVERHEAD UDP_OVERHEAD // the max. overhead of any protocol (ok, tcp doesn't count) |
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#define ETH_OVERHEAD 14 // the size of an ethernet header |
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#define MAXSIZE (MAX_MTU + VPE_OVERHEAD) // slightly too large, but who cares |
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#define PKTCACHESIZE 16 // the size of the memory pool for packets |
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extern char *confbase; // directory in which all config files are |
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extern char *thisnode; // config for current node (TODO: remove) |
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template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
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template<typename T, typename U> static inline void min_it (T &a, U b) { a = a < (T)b ? a : (T)b; } |
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template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
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template<typename T, typename U> static inline void max_it (T &a, U b) { a = a > (T)b ? a : (T)b; } |
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template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; } |
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template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
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#endif |
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