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 <pcg@goof.com> |
5 | 2003-2011 Marc Lehmann <gvpe@schmorp.de> |
6 | |
6 | |
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7 | This file is part of GVPE. |
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8 | |
7 | This program is free software; you can redistribute it and/or modify |
9 | GVPE is free software; you can redistribute it and/or modify it |
8 | 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 |
9 | the Free Software Foundation; either version 2 of the License, or |
11 | Free Software Foundation; either version 3 of the License, or (at your |
10 | (at your option) any later version. |
12 | option) any later version. |
11 | |
13 | |
12 | 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 |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
15 | GNU General Public License for more details. |
17 | Public License for more details. |
16 | |
18 | |
17 | 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 |
18 | along with this program; if not, write to the Free Software |
20 | with this program; if not, see <http://www.gnu.org/licenses/>. |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 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. |
20 | */ |
32 | */ |
21 | |
33 | |
22 | #ifndef UTIL_H__ |
34 | #ifndef UTIL_H__ |
23 | #define UTIL_H__ |
35 | #define UTIL_H__ |
24 | |
36 | |
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37 | #include <cstring> |
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38 | #include <sys/types.h> |
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39 | |
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40 | #include <openssl/rsa.h> |
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41 | |
25 | #include "gettext.h" |
42 | #include "gettext.h" |
26 | |
43 | |
27 | #include "slog.h" |
44 | #include "slog.h" |
28 | #include "iom.h" |
45 | #include "ev_cpp.h" |
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46 | #include "callback.h" |
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47 | |
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48 | typedef ev_tstamp tstamp; |
29 | |
49 | |
30 | /* |
50 | /* |
31 | * check for an existing vped for this net, and write pid to pidfile |
51 | * check for an existing gvpe for this net, and write pid to pidfile |
32 | */ |
52 | */ |
33 | extern int write_pidfile (void); |
53 | extern int write_pidfile (void); |
34 | |
54 | |
35 | /* |
55 | /* |
36 | * kill older vped |
56 | * kill older gvpe |
37 | */ |
57 | */ |
38 | extern int kill_other (int signal); |
58 | extern int kill_other (int signal); |
39 | |
59 | |
40 | /* |
60 | /* |
41 | * Detach from current terminal, write pidfile, kill parent |
61 | * Detach from current terminal, write pidfile, kill parent |
42 | */ |
62 | */ |
43 | extern int detach (int do_detach); |
63 | extern int detach (int do_detach); |
44 | |
64 | |
45 | /* |
65 | /* |
46 | * Set all files and paths according to netname |
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47 | */ |
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48 | extern void make_names (void); |
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49 | |
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50 | /* |
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51 | * check wether the given path is an absolute pathname |
66 | * check wether the given path is an absolute pathname |
52 | */ |
67 | */ |
53 | #define ABSOLUTE_PATH(c) ((c)[0] == '/') |
68 | #define ABSOLUTE_PATH(c) ((c)[0] == '/') |
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69 | |
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70 | /*****************************************************************************/ |
54 | |
71 | |
55 | typedef u8 mac[6]; |
72 | typedef u8 mac[6]; |
56 | |
73 | |
57 | extern void id2mac (unsigned int id, void *m); |
74 | extern void id2mac (unsigned int id, void *m); |
58 | |
75 | |
59 | #define mac2id(p) ((p)[0] & 0x01 ? 0 : ((p)[4] << 8) | (p)[5]) |
76 | #define mac2id(p) ((p)[0] & 0x01 ? 0 : ((p)[4] << 8) | (p)[5]) |
60 | |
77 | |
61 | struct sliding_window { |
78 | struct sliding_window |
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79 | { |
62 | u32 v[(WINDOWSIZE + 31) / 32]; |
80 | u32 v[(WINDOWSIZE + 31) / 32]; |
63 | u32 seq; |
81 | u32 seq; |
64 | |
82 | |
65 | void reset (u32 seqno) |
83 | void reset (u32 seqno) |
66 | { |
84 | { |
67 | memset (v, -1, sizeof v); |
85 | memset (v, -1, sizeof v); |
68 | seq = seqno; |
86 | seq = seqno; |
69 | } |
87 | } |
70 | |
88 | |
71 | bool recv_ok (u32 seqno) |
89 | // 0 == ok, 1 == far history, 2 == duplicate in-window, 3 == far future |
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90 | int seqno_classify (u32 seqno) |
72 | { |
91 | { |
73 | if (seqno <= seq - WINDOWSIZE) |
92 | if (seqno <= seq - WINDOWSIZE) |
74 | slog (L_ERR, _("received duplicate or outdated packet (received %08lx, expected %08lx)\n" |
93 | return 1; |
75 | "possible replay attack, or just massive packet reordering"), seqno, seq + 1);//D |
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76 | else if (seqno > seq + WINDOWSIZE) |
94 | else if (seqno > seq + WINDOWSIZE * 16) |
77 | slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n" |
95 | return 3; |
78 | "possible replay attack, or just massive packet loss"), seqno, seq + 1);//D |
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79 | else |
96 | else |
80 | { |
97 | { |
81 | while (seqno > seq) |
98 | while (seqno > seq) |
82 | { |
99 | { |
83 | seq++; |
100 | seq++; |
… | |
… | |
92 | u32 s = seqno % WINDOWSIZE; |
109 | u32 s = seqno % WINDOWSIZE; |
93 | u32 *cell = v + (s >> 5); |
110 | u32 *cell = v + (s >> 5); |
94 | u32 mask = 1 << (s & 31); |
111 | u32 mask = 1 << (s & 31); |
95 | |
112 | |
96 | if (*cell & mask) |
113 | if (*cell & mask) |
97 | { |
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98 | slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n" |
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99 | "possible replay attack, or just packet duplication"), seqno, seq + 1);//D |
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100 | return false; |
114 | return 2; |
101 | } |
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102 | else |
115 | else |
103 | { |
116 | { |
104 | *cell |= mask; |
117 | *cell |= mask; |
105 | return true; |
118 | return 0; |
106 | } |
119 | } |
107 | } |
120 | } |
108 | } |
121 | } |
109 | }; |
122 | }; |
110 | |
123 | |
111 | typedef callback0<const char *> run_script_cb; |
124 | typedef callback<const char *()> run_script_cb; |
112 | |
125 | |
113 | // run a shell script (or actually an external program). |
126 | // run a shell script (or actually an external program). |
114 | void run_script (const run_script_cb &cb, bool wait); |
127 | pid_t run_script (const run_script_cb &cb, bool wait); |
115 | |
128 | |
116 | #if ENABLE_HTTP_PROXY |
129 | #if ENABLE_HTTP_PROXY |
117 | u8 *base64_encode (const u8 *data, unsigned int len); |
130 | u8 *base64_encode (const u8 *data, unsigned int len); |
118 | #endif |
131 | #endif |
119 | |
132 | |
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133 | /*****************************************************************************/ |
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134 | |
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135 | typedef u8 rsaclear[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data; |
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136 | typedef u8 rsacrypt[RSA_KEYLEN]; // encrypted challenge |
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137 | |
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138 | static inline void |
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139 | rsa_encrypt (RSA *key, const rsaclear &chg, rsacrypt &encr) |
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140 | { |
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141 | if (RSA_public_encrypt (sizeof chg, |
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142 | (unsigned char *)&chg, (unsigned char *)&encr, |
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143 | key, RSA_PKCS1_OAEP_PADDING) < 0) |
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144 | fatal ("RSA_public_encrypt error"); |
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145 | } |
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146 | |
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147 | static inline bool |
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148 | rsa_decrypt (RSA *key, const rsacrypt &encr, rsaclear &chg) |
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149 | { |
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150 | return RSA_private_decrypt (sizeof encr, |
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151 | (unsigned char *)&encr, (unsigned char *)&chg, |
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152 | key, RSA_PKCS1_OAEP_PADDING) > 0; |
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153 | } |
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154 | |
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155 | /*****************************************************************************/ |
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156 | |
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157 | // run work_cb in another thread, call done_cb in main thread when finished |
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158 | // only one work_cb will execute at any one time. |
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159 | void async (callback<void ()> work_cb, callback<void ()> done_cb); |
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160 | |
120 | #endif |
161 | #endif |
121 | |
162 | |