1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
/*
* Copyright (C) 1996-2026 The Squid Software Foundation and contributors
*
* Squid software is distributed under GPLv2+ license and includes
* contributions from numerous individuals and organizations.
* Please see the COPYING and CONTRIBUTORS files for details.
*/
#include "squid.h"
#include "rfc1738.h"
#if HAVE_STRING_H
#include <string.h>
#endif
/*
* RFC 1738 defines that these characters should be escaped, as well
* any non-US-ASCII character or anything between 0x00 - 0x1F.
*/
static char rfc1738_unsafe_chars[] = {
(char) 0x3C, /* < */
(char) 0x3E, /* > */
(char) 0x22, /* " */
(char) 0x23, /* # */
#if 0 /* done in code */
(char) 0x20, /* space */
(char) 0x25, /* % */
#endif
(char) 0x7B, /* { */
(char) 0x7D, /* } */
(char) 0x7C, /* | */
(char) 0x5C, /* \ */
(char) 0x5E, /* ^ */
(char) 0x7E, /* ~ */
(char) 0x5B, /* [ */
(char) 0x5D, /* ] */
(char) 0x60, /* ` */
(char) 0x27 /* ' */
};
static char rfc1738_reserved_chars[] = {
(char) 0x3b, /* ; */
(char) 0x2f, /* / */
(char) 0x3f, /* ? */
(char) 0x3a, /* : */
(char) 0x40, /* @ */
(char) 0x3d, /* = */
(char) 0x26 /* & */
};
/*
* rfc1738_escape - Returns a static buffer contains the RFC 1738
* compliant, escaped version of the given url.
*/
char *
rfc1738_do_escape(const char *url, int flags)
{
static char *buf;
static size_t bufsize = 0;
const char *src;
char *dst;
unsigned int i, do_escape;
if (buf == NULL || strlen(url) * 3 > bufsize) {
xfree(buf);
bufsize = strlen(url) * 3 + 1;
buf = (char*)xcalloc(bufsize, 1);
}
for (src = url, dst = buf; *src != '\0' && dst < (buf + bufsize - 1); src++, dst++) {
/* a-z, A-Z and 0-9 are SAFE. */
if ((*src >= 'a' && *src <= 'z') || (*src >= 'A' && *src <= 'Z') || (*src >= '0' && *src <= '9')) {
*dst = *src;
continue;
}
do_escape = 0;
/* RFC 1738 defines these chars as unsafe */
if ((flags & RFC1738_ESCAPE_UNSAFE)) {
for (i = 0; i < sizeof(rfc1738_unsafe_chars); i++) {
if (*src == rfc1738_unsafe_chars[i]) {
do_escape = 1;
break;
}
}
/* Handle % separately */
if (!(flags & RFC1738_ESCAPE_NOPERCENT) && *src == '%')
do_escape = 1;
/* Handle space separately */
else if (!(flags & RFC1738_ESCAPE_NOSPACE) && *src <= ' ')
do_escape = 1;
}
/* RFC 1738 defines these chars as reserved */
if ((flags & RFC1738_ESCAPE_RESERVED) && do_escape == 0) {
for (i = 0; i < sizeof(rfc1738_reserved_chars); i++) {
if (*src == rfc1738_reserved_chars[i]) {
do_escape = 1;
break;
}
}
}
if ((flags & RFC1738_ESCAPE_CTRLS) && do_escape == 0) {
/* RFC 1738 says any control chars (0x00-0x1F) are encoded */
if ((unsigned char) *src <= (unsigned char) 0x1F)
do_escape = 1;
/* RFC 1738 says 0x7f is encoded */
else if (*src == (char) 0x7F)
do_escape = 1;
/* RFC 1738 says any non-US-ASCII are encoded */
else if (((unsigned char) *src >= (unsigned char) 0x80))
do_escape = 1;
}
/* Do the triplet encoding, or just copy the char */
if (do_escape == 1) {
(void) snprintf(dst, (bufsize-(dst-buf)), "%%%02X", (unsigned char) *src);
dst += sizeof(char) * 2;
} else {
*dst = *src;
}
}
*dst = '\0';
return (buf);
}
/*
* Converts a ascii hex code into a binary character.
*/
static int
fromhex(char ch)
{
if (ch >= '0' && ch <= '9')
return ch - '0';
if (ch >= 'a' && ch <= 'f')
return ch - 'a' + 10;
if (ch >= 'A' && ch <= 'F')
return ch - 'A' + 10;
return -1;
}
/*
* rfc1738_unescape() - Converts escaped characters (%xy numbers) in
* given the string. %% is a %. %ab is the 8-bit hexadecimal number "ab"
*/
void
rfc1738_unescape(char *s)
{
int i, j; /* i is write, j is read */
for (i = j = 0; s[j]; i++, j++) {
s[i] = s[j];
if (s[j] != '%') {
/* normal case, nothing more to do */
} else if (s[j + 1] == '%') { /* %% case */
j++; /* Skip % */
} else {
/* decode */
int v1, v2, x;
v1 = fromhex(s[j + 1]);
if (v1 < 0)
continue; /* non-hex or \0 */
v2 = fromhex(s[j + 2]);
if (v2 < 0)
continue; /* non-hex or \0 */
x = v1 << 4 | v2;
if (x > 0 && x <= 255) {
s[i] = x;
j += 2;
}
}
}
s[i] = '\0';
}
|
