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 | |
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22 | Additional permission under GNU GPL version 3 section 7 |
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23 | |
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24 | If you modify this Program, or any covered work, by linking or |
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25 | combining it with the OpenSSL project's OpenSSL library (or a modified |
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26 | version of that library), containing parts covered by the terms of the |
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27 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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28 | additional permission to convey the resulting work. Corresponding |
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29 | Source for a non-source form of such a combination shall include the |
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30 | source code for the parts of OpenSSL used as well as that of the |
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31 | covered work. |
22 | */ |
32 | */ |
23 | |
33 | |
24 | #ifndef UTIL_H__ |
34 | #ifndef UTIL_H__ |
25 | #define UTIL_H__ |
35 | #define UTIL_H__ |
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36 | |
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37 | #include <cstring> |
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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" |
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47 | #include "global.h" |
34 | |
48 | |
35 | typedef ev_tstamp tstamp; |
49 | typedef 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 |
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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); |
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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); |
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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); |
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104 | else |
116 | else |
105 | { |
117 | { |
106 | *cell |= mask; |
118 | *cell |= mask; |
107 | return true; |
119 | return 0; |
108 | } |
120 | } |
109 | } |
121 | } |
110 | |
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111 | return false; |
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112 | } |
122 | } |
113 | }; |
123 | }; |
114 | |
124 | |
115 | typedef callback0<const char *> run_script_cb; |
125 | typedef 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). |
118 | bool run_script (const run_script_cb &cb, bool wait); |
128 | pid_t run_script (const run_script_cb &cb, bool wait); |
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129 | |
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130 | void hexdump (const char *header, void *data, int len); |
119 | |
131 | |
120 | #if ENABLE_HTTP_PROXY |
132 | #if ENABLE_HTTP_PROXY |
121 | u8 *base64_encode (const u8 *data, unsigned int len); |
133 | u8 *base64_encode (const u8 *data, unsigned int len); |
122 | #endif |
134 | #endif |
123 | |
135 | |
124 | /*****************************************************************************/ |
136 | /*****************************************************************************/ |
125 | |
137 | |
126 | typedef u8 rsaclear[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data; |
138 | // run work_cb in another thread, call done_cb in main thread when finished |
127 | typedef u8 rsacrypt[RSA_KEYLEN]; // encrypted challenge |
139 | // only one work_cb will execute at any one time. |
128 | |
140 | void async (callback<void ()> work_cb, callback<void ()> done_cb); |
129 | static inline void |
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130 | rsa_encrypt (RSA *key, const rsaclear &chg, rsacrypt &encr) |
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131 | { |
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132 | if (RSA_public_encrypt (sizeof chg, |
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133 | (unsigned char *)&chg, (unsigned char *)&encr, |
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134 | key, RSA_PKCS1_OAEP_PADDING) < 0) |
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135 | fatal ("RSA_public_encrypt error"); |
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136 | } |
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137 | |
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138 | static inline bool |
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139 | rsa_decrypt (RSA *key, const rsacrypt &encr, rsaclear &chg) |
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140 | { |
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141 | return RSA_private_decrypt (sizeof encr, |
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142 | (unsigned char *)&encr, (unsigned char *)&chg, |
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143 | key, RSA_PKCS1_OAEP_PADDING) > 0; |
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144 | } |
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145 | |
141 | |
146 | #endif |
142 | #endif |
147 | |
143 | |