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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/* ----------------------------------------------------------------------- *
*
* Copyright 2009-2011 Intel Corporation; author: H. Peter Anvin
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* urlparse.c
*/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "url.h"
/*
* Return the type of a URL without modifying the string
*/
enum url_type url_type(const char *url)
{
const char *q;
q = strchr(url, ':');
if (!q)
return URL_SUFFIX;
if (q[1] == '/' && q[2] == '/')
return URL_NORMAL;
if (q[1] == ':')
return URL_OLD_TFTP;
return URL_SUFFIX;
}
/*
* Decompose a URL into its components. This is done in-place;
* this routine does not allocate any additional storage. Freeing the
* original buffer frees all storage used.
*/
__export void parse_url(struct url_info *ui, char *url)
{
char *p = url;
char *q, *r, *s;
int c;
memset(ui, 0, sizeof *ui);
q = strchr(p, ':');
if (q && (q[1] == '/' && q[2] == '/')) {
ui->type = URL_NORMAL;
ui->scheme = p;
*q = '\0';
p = q+3;
q = strchr(p, '/');
if (q) {
*q = '\0';
ui->path = q+1;
q = strchr(q+1, '#');
if (q)
*q = '\0';
} else {
ui->path = "";
}
r = strchr(p, '@');
if (r) {
ui->user = p;
*r = '\0';
s = strchr(p, ':');
if (s) {
*s = '\0';
ui->passwd = s+1;
}
p = r+1;
}
ui->host = p;
r = strchr(p, ':');
if (r) {
*r++ = '\0';
ui->port = 0;
while ((c = *r++)) {
c -= '0';
if (c > 9)
break;
ui->port = ui->port * 10 + c;
}
}
} else if (q && q[1] == ':') {
*q = '\0';
ui->scheme = "tftp";
ui->host = p;
ui->path = q+2;
ui->type = URL_OLD_TFTP;
} else {
ui->path = p;
ui->type = URL_SUFFIX;
}
}
/*
* Escapes unsafe characters in a URL.
* This does *not* escape things like query characters!
* Returns the number of characters in the total output.
*/
size_t url_escape_unsafe(char *output, const char *input, size_t bufsize)
{
static const char uchexchar[] = "0123456789ABCDEF";
const char *p;
unsigned char c;
char *q;
size_t n = 0;
q = output;
for (p = input; (c = *p); p++) {
if (c <= ' ' || c > '~') {
if (++n < bufsize) *q++ = '%';
if (++n < bufsize) *q++ = uchexchar[c >> 4];
if (++n < bufsize) *q++ = uchexchar[c & 15];
} else {
if (++n < bufsize) *q++ = c;
}
}
*q = '\0';
return n;
}
static int hexdigit(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
c |= 0x20;
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
return -1;
}
/*
* Unescapes a buffer, optionally ending at an *unescaped* terminator
* (like ; for TFTP). The unescaping is done in-place.
*
* If a terminator is reached, return a pointer to the first character
* after the terminator.
*/
char *url_unescape(char *buffer, char terminator)
{
char *p = buffer;
char *q = buffer;
unsigned char c;
int x, y;
while ((c = *p)) {
if (c == terminator) {
*q = '\0';
return p;
}
p++;
if (c == '%') {
x = hexdigit(p[0]);
if (x >= 0) {
y = hexdigit(p[1]);
if (y >= 0) {
*q++ = (x << 4) + y;
p += 2;
continue;
}
}
}
*q++ = c;
}
*q = '\0';
return NULL;
}
#ifdef URL_TEST
int main(int argc, char *argv[])
{
int i;
struct url_info url;
for (i = 1; i < argc; i++) {
parse_url(&url, argv[i]);
printf("scheme: %s\n"
"user: %s\n"
"passwd: %s\n"
"host: %s\n"
"port: %d\n"
"path: %s\n"
"type: %d\n",
url.scheme, url.user, url.passwd, url.host, url.port,
url.path, url.type);
}
return 0;
}
#endif
|
