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author | lurchi <lurchi@strangeplace.net> | 2018-06-25 18:38:13 +0200 |
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committer | lurchi <lurchi@strangeplace.net> | 2018-06-25 18:38:27 +0200 |
commit | a4186fc2fd00b3fe2899bffcdbbbf8fead31115f (patch) | |
tree | d70c5939cc99d43e29ce63a4faa9ef334de0c81d /src/regex/regex_test_random.c | |
parent | 7da98cf076e9c5101244dfbbf8c3ddff045d298e (diff) | |
download | gnunet-a4186fc2fd00b3fe2899bffcdbbbf8fead31115f.tar.gz gnunet-a4186fc2fd00b3fe2899bffcdbbbf8fead31115f.zip |
Revert "integrate dnsparser and dnsstub and tun with libgnunetutil"
This reverts commit 7da98cf076e9c5101244dfbbf8c3ddff045d298e.
Diffstat (limited to 'src/regex/regex_test_random.c')
-rw-r--r-- | src/regex/regex_test_random.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/src/regex/regex_test_random.c b/src/regex/regex_test_random.c new file mode 100644 index 000000000..6e51885ee --- /dev/null +++ b/src/regex/regex_test_random.c | |||
@@ -0,0 +1,169 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet | ||
3 | Copyright (C) 2012 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software: you can redistribute it and/or modify it | ||
6 | under the terms of the GNU Affero General Public License as published | ||
7 | by the Free Software Foundation, either version 3 of the License, | ||
8 | or (at your option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Affero General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Affero General Public License | ||
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | */ | ||
18 | /** | ||
19 | * @file src/regex/regex_test_random.c | ||
20 | * @brief functions for creating random regular expressions and strings | ||
21 | * @author Maximilian Szengel | ||
22 | */ | ||
23 | #include "platform.h" | ||
24 | #include "regex_test_lib.h" | ||
25 | #include "gnunet_crypto_lib.h" | ||
26 | #include "regex_internal.h" | ||
27 | |||
28 | |||
29 | /** | ||
30 | * Get a (pseudo) random valid literal for building a regular expression. | ||
31 | * | ||
32 | * @return random valid literal | ||
33 | */ | ||
34 | static char | ||
35 | get_random_literal () | ||
36 | { | ||
37 | uint32_t ridx; | ||
38 | |||
39 | ridx = | ||
40 | GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, | ||
41 | (uint32_t) strlen (ALLOWED_LITERALS)); | ||
42 | |||
43 | return ALLOWED_LITERALS[ridx]; | ||
44 | } | ||
45 | |||
46 | |||
47 | /** | ||
48 | * Generate a (pseudo) random regular expression of length 'rx_length', as well | ||
49 | * as a (optional) string that will be matched by the generated regex. The | ||
50 | * returned regex needs to be freed. | ||
51 | * | ||
52 | * @param rx_length length of the random regex. | ||
53 | * @param matching_str (optional) pointer to a string that will contain a string | ||
54 | * that will be matched by the generated regex, if | ||
55 | * 'matching_str' pointer was not NULL. Make sure you | ||
56 | * allocated at least rx_length+1 bytes for this sting. | ||
57 | * | ||
58 | * @return NULL if 'rx_length' is 0, a random regex of length 'rx_length', which | ||
59 | * needs to be freed, otherwise. | ||
60 | */ | ||
61 | char * | ||
62 | REGEX_TEST_generate_random_regex (size_t rx_length, char *matching_str) | ||
63 | { | ||
64 | char *rx; | ||
65 | char *rx_p; | ||
66 | char *matching_strp; | ||
67 | unsigned int i; | ||
68 | unsigned int char_op_switch; | ||
69 | unsigned int last_was_op; | ||
70 | int rx_op; | ||
71 | char current_char; | ||
72 | |||
73 | if (0 == rx_length) | ||
74 | return NULL; | ||
75 | |||
76 | if (NULL != matching_str) | ||
77 | matching_strp = matching_str; | ||
78 | else | ||
79 | matching_strp = NULL; | ||
80 | |||
81 | rx = GNUNET_malloc (rx_length + 1); | ||
82 | rx_p = rx; | ||
83 | current_char = 0; | ||
84 | last_was_op = 1; | ||
85 | |||
86 | for (i = 0; i < rx_length; i++) | ||
87 | { | ||
88 | char_op_switch = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 2); | ||
89 | |||
90 | if (0 == char_op_switch && !last_was_op) | ||
91 | { | ||
92 | last_was_op = 1; | ||
93 | rx_op = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 4); | ||
94 | |||
95 | switch (rx_op) | ||
96 | { | ||
97 | case 0: | ||
98 | current_char = '+'; | ||
99 | break; | ||
100 | case 1: | ||
101 | current_char = '*'; | ||
102 | break; | ||
103 | case 2: | ||
104 | current_char = '?'; | ||
105 | break; | ||
106 | case 3: | ||
107 | if (i < rx_length - 1) /* '|' cannot be at the end */ | ||
108 | current_char = '|'; | ||
109 | else | ||
110 | current_char = get_random_literal (); | ||
111 | break; | ||
112 | } | ||
113 | } | ||
114 | else | ||
115 | { | ||
116 | current_char = get_random_literal (); | ||
117 | last_was_op = 0; | ||
118 | } | ||
119 | |||
120 | if (NULL != matching_strp && | ||
121 | (current_char != '+' && current_char != '*' && current_char != '?' && | ||
122 | current_char != '|')) | ||
123 | { | ||
124 | *matching_strp = current_char; | ||
125 | matching_strp++; | ||
126 | } | ||
127 | |||
128 | *rx_p = current_char; | ||
129 | rx_p++; | ||
130 | } | ||
131 | *rx_p = '\0'; | ||
132 | if (NULL != matching_strp) | ||
133 | *matching_strp = '\0'; | ||
134 | |||
135 | return rx; | ||
136 | } | ||
137 | |||
138 | |||
139 | /** | ||
140 | * Generate a random string of maximum length 'max_len' that only contains literals allowed | ||
141 | * in a regular expression. The string might be 0 chars long but is garantueed | ||
142 | * to be shorter or equal to 'max_len'. | ||
143 | * | ||
144 | * @param max_len maximum length of the string that should be generated. | ||
145 | * | ||
146 | * @return random string that needs to be freed. | ||
147 | */ | ||
148 | char * | ||
149 | REGEX_TEST_generate_random_string (size_t max_len) | ||
150 | { | ||
151 | unsigned int i; | ||
152 | char *str; | ||
153 | size_t len; | ||
154 | |||
155 | if (1 > max_len) | ||
156 | return GNUNET_strdup (""); | ||
157 | |||
158 | len = (size_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, max_len); | ||
159 | str = GNUNET_malloc (len + 1); | ||
160 | |||
161 | for (i = 0; i < len; i++) | ||
162 | { | ||
163 | str[i] = get_random_literal (); | ||
164 | } | ||
165 | |||
166 | str[i] = '\0'; | ||
167 | |||
168 | return str; | ||
169 | } | ||