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Comparing gvpe/src/util.h (file contents):
Revision 1.23 by pcg, Sun Dec 2 00:54:52 2007 UTC vs.
Revision 1.31 by root, Tue Jul 16 16:44:37 2013 UTC

1/* 1/*
2 util.h -- process management and other utility functions 2 util.h -- process management and other utility functions
3 Copyright (C) 1998-2002 Ivo Timmermans <ivo@o2w.nl> 3 Copyright (C) 1998-2002 Ivo Timmermans <ivo@o2w.nl>
4 2000-2002 Guus Sliepen <guus@sliepen.eu.org> 4 2000-2002 Guus Sliepen <guus@sliepen.eu.org>
5 2003 Marc Lehmann <gvpe@schmorp.de> 5 2003-2013 Marc Lehmann <gvpe@schmorp.de>
6 6
7 This file is part of GVPE. 7 This file is part of GVPE.
8 8
9 GVPE is free software; you can redistribute it and/or modify 9 GVPE is free software; you can redistribute it and/or modify it
10 it under the terms of the GNU General Public License as published by 10 under the terms of the GNU General Public License as published by the
11 the Free Software Foundation; either version 2 of the License, or 11 Free Software Foundation; either version 3 of the License, or (at your
12 (at your option) any later version. 12 option) any later version.
13 13
14 This program is distributed in the hope that it will be useful, 14 This program is distributed in the hope that it will be useful, but
15 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
17 GNU General Public License for more details. 17 Public License for more details.
18 18
19 You should have received a copy of the GNU General Public License 19 You should have received a copy of the GNU General Public License along
20 along with gvpe; if not, write to the Free Software 20 with this program; if not, see <http://www.gnu.org/licenses/>.
21 Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21
22 Additional permission under GNU GPL version 3 section 7
23
24 If you modify this Program, or any covered work, by linking or
25 combining it with the OpenSSL project's OpenSSL library (or a modified
26 version of that library), containing parts covered by the terms of the
27 OpenSSL or SSLeay licenses, the licensors of this Program grant you
28 additional permission to convey the resulting work. Corresponding
29 Source for a non-source form of such a combination shall include the
30 source code for the parts of OpenSSL used as well as that of the
31 covered work.
22*/ 32*/
23 33
24#ifndef UTIL_H__ 34#ifndef UTIL_H__
25#define UTIL_H__ 35#define UTIL_H__
36
37#include <cstring>
38#include <sys/types.h>
26 39
27#include <openssl/rsa.h> 40#include <openssl/rsa.h>
28 41
29#include "gettext.h" 42#include "gettext.h"
30 43
31#include "slog.h" 44#include "slog.h"
32#include "ev_cpp.h" 45#include "ev_cpp.h"
33#include "callback.h" 46#include "callback.h"
47#include "global.h"
34 48
35typedef ev_tstamp tstamp; 49typedef ev_tstamp tstamp;
36 50
37/* 51/*
38 * check for an existing gvpe for this net, and write pid to pidfile 52 * check for an existing gvpe for this net, and write pid to pidfile
… …
71 { 85 {
72 memset (v, -1, sizeof v); 86 memset (v, -1, sizeof v);
73 seq = seqno; 87 seq = seqno;
74 } 88 }
75 89
76 bool recv_ok (u32 seqno) 90 // 0 == ok, 1 == far history, 2 == duplicate in-window, 3 == far future
91 int seqno_classify (u32 seqno)
77 { 92 {
78 if (seqno <= seq - WINDOWSIZE) 93 if (seqno <= seq - WINDOWSIZE)
79 slog (L_ERR, _("received duplicate or outdated packet (received %08lx, expected %08lx)\n" 94 return 1;
80 "possible replay attack, or just massive packet reordering"), seqno, seq + 1);
81 else if (seqno > seq + WINDOWSIZE * 4) 95 else if (seqno > seq + WINDOWSIZE * 16)
82 slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n" 96 return 3;
83 "possible replay attack, or just massive packet loss"), seqno, seq + 1);
84 else 97 else
85 { 98 {
86 while (seqno > seq) 99 while (seqno > seq)
87 { 100 {
88 seq++; 101 seq++;
… …
97 u32 s = seqno % WINDOWSIZE; 110 u32 s = seqno % WINDOWSIZE;
98 u32 *cell = v + (s >> 5); 111 u32 *cell = v + (s >> 5);
99 u32 mask = 1 << (s & 31); 112 u32 mask = 1 << (s & 31);
100 113
101 if (*cell & mask) 114 if (*cell & mask)
102 slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n" 115 return 2;
103 "possible replay attack, or just packet duplication"), seqno, seq + 1);
104 else 116 else
105 { 117 {
106 *cell |= mask; 118 *cell |= mask;
107 return true; 119 return 0;
108 } 120 }
109 } 121 }
110
111 return false;
112 } 122 }
113}; 123};
114 124
115typedef callback<const char * ()> run_script_cb; 125typedef callback<const char *()> run_script_cb;
116 126
117// run a shell script (or actually an external program). 127// run a shell script (or actually an external program).
118bool run_script (const run_script_cb &cb, bool wait); 128pid_t run_script (const run_script_cb &cb, bool wait);
119 129
120#if ENABLE_HTTP_PROXY 130#if ENABLE_HTTP_PROXY
121u8 *base64_encode (const u8 *data, unsigned int len); 131u8 *base64_encode (const u8 *data, unsigned int len);
122#endif 132#endif
123 133
124/*****************************************************************************/ 134/*****************************************************************************/
125 135
126typedef u8 rsaclear[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data; 136// run work_cb in another thread, call done_cb in main thread when finished
127typedef u8 rsacrypt[RSA_KEYLEN]; // encrypted challenge 137// only one work_cb will execute at any one time.
128 138void async (callback<void ()> work_cb, callback<void ()> done_cb);
129static inline void
130rsa_encrypt (RSA *key, const rsaclear &chg, rsacrypt &encr)
131{
132 if (RSA_public_encrypt (sizeof chg,
133 (unsigned char *)&chg, (unsigned char *)&encr,
134 key, RSA_PKCS1_OAEP_PADDING) < 0)
135 fatal ("RSA_public_encrypt error");
136}
137
138static inline bool
139rsa_decrypt (RSA *key, const rsacrypt &encr, rsaclear &chg)
140{
141 return RSA_private_decrypt (sizeof encr,
142 (unsigned char *)&encr, (unsigned char *)&chg,
143 key, RSA_PKCS1_OAEP_PADDING) > 0;
144}
145 139
146#endif 140#endif
147 141

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