| 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 | 2003-2008 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 it |
9 | GVPE is free software; you can redistribute it and/or modify it |
| 10 | under the terms of the GNU General Public License as published by the |
10 | under the terms of the GNU General Public License as published by the |
| … | |
… | |
| 33 | |
33 | |
| 34 | #ifndef UTIL_H__ |
34 | #ifndef UTIL_H__ |
| 35 | #define UTIL_H__ |
35 | #define UTIL_H__ |
| 36 | |
36 | |
| 37 | #include <cstring> |
37 | #include <cstring> |
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|
38 | #include <sys/types.h> |
| 38 | |
39 | |
| 39 | #include <openssl/rsa.h> |
40 | #include <openssl/rsa.h> |
| 40 | |
41 | |
| 41 | #include "gettext.h" |
42 | #include "gettext.h" |
| 42 | |
43 | |
| 43 | #include "slog.h" |
44 | #include "slog.h" |
| 44 | #include "ev_cpp.h" |
45 | #include "ev_cpp.h" |
| 45 | #include "callback.h" |
46 | #include "callback.h" |
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|
47 | #include "global.h" |
| 46 | |
48 | |
| 47 | typedef ev_tstamp tstamp; |
49 | typedef ev_tstamp tstamp; |
| 48 | |
50 | |
| 49 | /* |
51 | /* |
| 50 | * 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 |
| … | |
… | |
| 83 | { |
85 | { |
| 84 | memset (v, -1, sizeof v); |
86 | memset (v, -1, sizeof v); |
| 85 | seq = seqno; |
87 | seq = seqno; |
| 86 | } |
88 | } |
| 87 | |
89 | |
| 88 | 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) |
| 89 | { |
92 | { |
| 90 | if (seqno <= seq - WINDOWSIZE) |
93 | if (seqno <= seq - WINDOWSIZE) |
| 91 | slog (L_ERR, _("received duplicate or outdated packet (received %08lx, expected %08lx)\n" |
94 | return 1; |
| 92 | "possible replay attack, or just massive packet reordering"), seqno, seq + 1); |
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|
| 93 | else if (seqno > seq + WINDOWSIZE * 4) |
95 | else if (seqno > seq + WINDOWSIZE * 16) |
| 94 | slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n" |
96 | return 3; |
| 95 | "possible replay attack, or just massive packet loss"), seqno, seq + 1); |
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|
| 96 | else |
97 | else |
| 97 | { |
98 | { |
| 98 | while (seqno > seq) |
99 | while (seqno > seq) |
| 99 | { |
100 | { |
| 100 | seq++; |
101 | seq++; |
| … | |
… | |
| 109 | u32 s = seqno % WINDOWSIZE; |
110 | u32 s = seqno % WINDOWSIZE; |
| 110 | u32 *cell = v + (s >> 5); |
111 | u32 *cell = v + (s >> 5); |
| 111 | u32 mask = 1 << (s & 31); |
112 | u32 mask = 1 << (s & 31); |
| 112 | |
113 | |
| 113 | if (*cell & mask) |
114 | if (*cell & mask) |
| 114 | slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n" |
115 | return 2; |
| 115 | "possible replay attack, or just packet duplication"), seqno, seq + 1); |
|
|
| 116 | else |
116 | else |
| 117 | { |
117 | { |
| 118 | *cell |= mask; |
118 | *cell |= mask; |
| 119 | return true; |
119 | return 0; |
| 120 | } |
120 | } |
| 121 | } |
121 | } |
| 122 | |
|
|
| 123 | return false; |
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|
| 124 | } |
122 | } |
| 125 | }; |
123 | }; |
| 126 | |
124 | |
| 127 | typedef callback<const char * ()> run_script_cb; |
125 | typedef callback<const char *()> run_script_cb; |
| 128 | |
126 | |
| 129 | // run a shell script (or actually an external program). |
127 | // run a shell script (or actually an external program). |
| 130 | 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); |
| 131 | |
131 | |
| 132 | #if ENABLE_HTTP_PROXY |
132 | #if ENABLE_HTTP_PROXY |
| 133 | u8 *base64_encode (const u8 *data, unsigned int len); |
133 | u8 *base64_encode (const u8 *data, unsigned int len); |
| 134 | #endif |
134 | #endif |
| 135 | |
135 | |
| 136 | /*****************************************************************************/ |
136 | /*****************************************************************************/ |
| 137 | |
137 | |
| 138 | typedef u8 rsaclear[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data; |
138 | // run work_cb in another thread, call done_cb in main thread when finished |
| 139 | typedef u8 rsacrypt[RSA_KEYLEN]; // encrypted challenge |
139 | // only one work_cb will execute at any one time. |
| 140 | |
140 | void async (callback<void ()> work_cb, callback<void ()> done_cb); |
| 141 | static inline void |
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| 142 | rsa_encrypt (RSA *key, const rsaclear &chg, rsacrypt &encr) |
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| 143 | { |
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| 144 | if (RSA_public_encrypt (sizeof chg, |
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| 145 | (unsigned char *)&chg, (unsigned char *)&encr, |
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| 146 | key, RSA_PKCS1_OAEP_PADDING) < 0) |
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| 147 | fatal ("RSA_public_encrypt error"); |
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| 148 | } |
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| 149 | |
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| 150 | static inline bool |
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| 151 | rsa_decrypt (RSA *key, const rsacrypt &encr, rsaclear &chg) |
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| 152 | { |
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| 153 | return RSA_private_decrypt (sizeof encr, |
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| 154 | (unsigned char *)&encr, (unsigned char *)&chg, |
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| 155 | key, RSA_PKCS1_OAEP_PADDING) > 0; |
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| 156 | } |
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| 157 | |
141 | |
| 158 | #endif |
142 | #endif |
| 159 | |
143 | |
