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/* |
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util.h -- process management and other utility functions |
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Copyright (C) 1998-2002 Ivo Timmermans <ivo@o2w.nl> |
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2000-2002 Guus Sliepen <guus@sliepen.eu.org> |
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2003 Marc Lehmann <gvpe@schmorp.de> |
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|
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This file is part of GVPE. |
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|
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GVPE is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General 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 |
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along with gvpe; if not, write to the Free Software |
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Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#ifndef UTIL_H__ |
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#define UTIL_H__ |
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|
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#include <cstring> |
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|
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#include <openssl/rsa.h> |
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|
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#include "gettext.h" |
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|
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#include "slog.h" |
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#include "ev_cpp.h" |
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#include "callback.h" |
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|
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typedef ev_tstamp tstamp; |
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|
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/* |
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* check for an existing gvpe for this net, and write pid to pidfile |
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*/ |
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extern int write_pidfile (void); |
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|
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/* |
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* kill older gvpe |
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*/ |
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extern int kill_other (int signal); |
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|
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/* |
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* Detach from current terminal, write pidfile, kill parent |
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*/ |
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extern int detach (int do_detach); |
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|
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/* |
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* check wether the given path is an absolute pathname |
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*/ |
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#define ABSOLUTE_PATH(c) ((c)[0] == '/') |
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|
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/*****************************************************************************/ |
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|
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typedef u8 mac[6]; |
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|
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extern void id2mac (unsigned int id, void *m); |
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|
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#define mac2id(p) ((p)[0] & 0x01 ? 0 : ((p)[4] << 8) | (p)[5]) |
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|
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struct sliding_window |
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{ |
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u32 v[(WINDOWSIZE + 31) / 32]; |
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u32 seq; |
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|
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void reset (u32 seqno) |
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{ |
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memset (v, -1, sizeof v); |
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seq = seqno; |
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} |
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|
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bool recv_ok (u32 seqno) |
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{ |
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if (seqno <= seq - WINDOWSIZE) |
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slog (L_ERR, _("received duplicate or outdated packet (received %08lx, expected %08lx)\n" |
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"possible replay attack, or just massive packet reordering"), seqno, seq + 1); |
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else if (seqno > seq + WINDOWSIZE * 4) |
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slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n" |
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"possible replay attack, or just massive packet loss"), seqno, seq + 1); |
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else |
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{ |
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while (seqno > seq) |
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{ |
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seq++; |
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|
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u32 s = seq % WINDOWSIZE; |
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u32 *cell = v + (s >> 5); |
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u32 mask = 1 << (s & 31); |
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|
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*cell &= ~mask; |
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} |
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|
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u32 s = seqno % WINDOWSIZE; |
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u32 *cell = v + (s >> 5); |
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u32 mask = 1 << (s & 31); |
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|
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if (*cell & mask) |
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slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n" |
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"possible replay attack, or just packet duplication"), seqno, seq + 1); |
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else |
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{ |
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*cell |= mask; |
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return true; |
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} |
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} |
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|
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return false; |
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} |
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}; |
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|
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typedef callback<const char * ()> run_script_cb; |
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|
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// run a shell script (or actually an external program). |
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bool run_script (const run_script_cb &cb, bool wait); |
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|
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#if ENABLE_HTTP_PROXY |
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u8 *base64_encode (const u8 *data, unsigned int len); |
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#endif |
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|
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/*****************************************************************************/ |
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|
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typedef u8 rsaclear[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data; |
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typedef u8 rsacrypt[RSA_KEYLEN]; // encrypted challenge |
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|
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static inline void |
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rsa_encrypt (RSA *key, const rsaclear &chg, rsacrypt &encr) |
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{ |
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if (RSA_public_encrypt (sizeof chg, |
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(unsigned char *)&chg, (unsigned char *)&encr, |
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key, RSA_PKCS1_OAEP_PADDING) < 0) |
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fatal ("RSA_public_encrypt error"); |
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} |
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|
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static inline bool |
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rsa_decrypt (RSA *key, const rsacrypt &encr, rsaclear &chg) |
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{ |
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return RSA_private_decrypt (sizeof encr, |
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(unsigned char *)&encr, (unsigned char *)&chg, |
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key, RSA_PKCS1_OAEP_PADDING) > 0; |
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} |
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|
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#endif |
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|
