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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 | |
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83 | { |
84 | { |
84 | memset (v, -1, sizeof v); |
85 | memset (v, -1, sizeof v); |
85 | seq = seqno; |
86 | seq = seqno; |
86 | } |
87 | } |
87 | |
88 | |
88 | bool recv_ok (u32 seqno) |
89 | // 0 == ok, 1 == silently ignore, 2 == error, reset |
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90 | int seqno_classify (u32 seqno) |
89 | { |
91 | { |
90 | if (seqno <= seq - WINDOWSIZE) |
92 | if (seqno <= seq - WINDOWSIZE) |
91 | slog (L_ERR, _("received duplicate or outdated packet (received %08lx, expected %08lx)\n" |
93 | 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) |
94 | else if (seqno > seq + WINDOWSIZE * 16) |
94 | slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n" |
95 | return 2; |
95 | "possible replay attack, or just massive packet loss"), seqno, seq + 1); |
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96 | else |
96 | else |
97 | { |
97 | { |
98 | while (seqno > seq) |
98 | while (seqno > seq) |
99 | { |
99 | { |
100 | seq++; |
100 | seq++; |
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109 | u32 s = seqno % WINDOWSIZE; |
109 | u32 s = seqno % WINDOWSIZE; |
110 | u32 *cell = v + (s >> 5); |
110 | u32 *cell = v + (s >> 5); |
111 | u32 mask = 1 << (s & 31); |
111 | u32 mask = 1 << (s & 31); |
112 | |
112 | |
113 | if (*cell & mask) |
113 | if (*cell & mask) |
114 | slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n" |
114 | return 1; |
115 | "possible replay attack, or just packet duplication"), seqno, seq + 1); |
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116 | else |
115 | else |
117 | { |
116 | { |
118 | *cell |= mask; |
117 | *cell |= mask; |
119 | return true; |
118 | return 0; |
120 | } |
119 | } |
121 | } |
120 | } |
122 | |
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123 | return false; |
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124 | } |
121 | } |
125 | }; |
122 | }; |
126 | |
123 | |
127 | typedef callback<const char * ()> run_script_cb; |
124 | typedef callback<const char * ()> run_script_cb; |
128 | |
125 | |
129 | // run a shell script (or actually an external program). |
126 | // run a shell script (or actually an external program). |
130 | bool run_script (const run_script_cb &cb, bool wait); |
127 | pid_t run_script (const run_script_cb &cb, bool wait); |
131 | |
128 | |
132 | #if ENABLE_HTTP_PROXY |
129 | #if ENABLE_HTTP_PROXY |
133 | u8 *base64_encode (const u8 *data, unsigned int len); |
130 | u8 *base64_encode (const u8 *data, unsigned int len); |
134 | #endif |
131 | #endif |
135 | |
132 | |