1/* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements.  See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License.  You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#if defined(WIN32) || defined(OS2)
18#define NEED_ENHANCED_ESCAPES
19#endif
20
21#include <stdio.h>
22#include <string.h>
23#include <stdio.h>
24#include <ctype.h>
25
26/* A bunch of functions in util.c scan strings looking for certain characters.
27 * To make that more efficient we encode a lookup table.
28 */
29#define T_ESCAPE_SHELL_CMD    (0x01)
30#define T_ESCAPE_PATH_SEGMENT (0x02)
31#define T_OS_ESCAPE_PATH      (0x04)
32#define T_ESCAPE_ECHO         (0x08)
33#define T_ESCAPE_URLENCODED   (0x10)
34#define T_ESCAPE_XML          (0x20)
35
36int main(int argc, char *argv[])
37{
38    unsigned c;
39    unsigned char flags;
40
41    printf("/* this file is automatically generated by gen_test_char, "
42           "do not edit. \"make include/private/apr_escape_test_char.h\" to regenerate. */\n"
43           "#define T_ESCAPE_SHELL_CMD     (%u)\n"
44           "#define T_ESCAPE_PATH_SEGMENT  (%u)\n"
45           "#define T_OS_ESCAPE_PATH       (%u)\n"
46           "#define T_ESCAPE_ECHO          (%u)\n"
47           "#define T_ESCAPE_URLENCODED    (%u)\n"
48           "#define T_ESCAPE_XML           (%u)\n"
49           "\n"
50           "static const unsigned char test_char_table[256] = {",
51           T_ESCAPE_SHELL_CMD,
52           T_ESCAPE_PATH_SEGMENT,
53           T_OS_ESCAPE_PATH,
54           T_ESCAPE_ECHO,
55           T_ESCAPE_URLENCODED,
56           T_ESCAPE_XML);
57
58    for (c = 0; c < 256; ++c) {
59        flags = 0;
60        if (c % 20 == 0)
61            printf("\n    ");
62
63        /* escape_shell_cmd */
64#ifdef NEED_ENHANCED_ESCAPES
65        /* Win32/OS2 have many of the same vulnerable characters
66         * as Unix sh, plus the carriage return and percent char.
67         * The proper escaping of these characters varies from unix
68         * since Win32/OS2 use carets or doubled-double quotes,
69         * and neither lf nor cr can be escaped.  We escape unix
70         * specific as well, to assure that cross-compiled unix
71         * applications behave similiarly when invoked on win32/os2.
72         *
73         * Rem please keep in-sync with apr's list in win32/filesys.c
74         */
75        if (c && strchr("&;`'\"|*?~<>^()[]{}$\\\n\r%", c)) {
76            flags |= T_ESCAPE_SHELL_CMD;
77        }
78#else
79        if (c && strchr("&;`'\"|*?~<>^()[]{}$\\\n", c)) {
80            flags |= T_ESCAPE_SHELL_CMD;
81        }
82#endif
83
84        if (!isalnum(c) && !strchr("$-_.+!*'(),:@&=~", c)) {
85            flags |= T_ESCAPE_PATH_SEGMENT;
86        }
87
88        if (!isalnum(c) && !strchr("$-_.+!*'(),:@&=/~", c)) {
89            flags |= T_OS_ESCAPE_PATH;
90        }
91
92        if (!isalnum(c) && !strchr(".-*_ ", c)) {
93            flags |= T_ESCAPE_URLENCODED;
94        }
95
96        /* For logging, escape all control characters,
97         * double quotes (because they delimit the request in the log file)
98         * backslashes (because we use backslash for escaping)
99         * and 8-bit chars with the high bit set
100         */
101        if (c && (!isprint(c) || c == '"' || c == '\\' || iscntrl(c))) {
102            flags |= T_ESCAPE_ECHO;
103        }
104
105        if (strchr("<>&\"", c)) {
106            flags |= T_ESCAPE_XML;
107        }
108
109        printf("%u%c", flags, (c < 255) ? ',' : ' ');
110    }
111
112    printf("\n};\n");
113
114    return 0;
115}
116