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
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
|
/*
* Copyright 2001-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/http.h>
#include <openssl/httperr.h>
#include <openssl/bio.h> /* for BIO_snprintf() */
#include <openssl/err.h>
#include <string.h>
#include "internal/cryptlib.h" /* for ossl_assert() */
#include "http_local.h"
static void init_pstring(char **pstr)
{
if (pstr != NULL) {
*pstr = NULL;
}
}
static int copy_substring(char **dest, const char *start, const char *end)
{
return dest == NULL
|| (*dest = OPENSSL_strndup(start, end - start)) != NULL;
}
static void free_pstring(char **pstr)
{
if (pstr != NULL) {
OPENSSL_free(*pstr);
*pstr = NULL;
}
}
int OSSL_parse_url(const char *url, char **pscheme, char **puser, char **phost,
char **pport, int *pport_num,
char **ppath, char **pquery, char **pfrag)
{
const char *p, *tmp;
const char *scheme, *scheme_end;
const char *user, *user_end;
const char *host, *host_end;
const char *port, *port_end;
unsigned int portnum;
const char *path, *path_end;
const char *query, *query_end;
const char *frag, *frag_end;
init_pstring(pscheme);
init_pstring(puser);
init_pstring(phost);
init_pstring(pport);
init_pstring(ppath);
init_pstring(pfrag);
init_pstring(pquery);
if (url == NULL) {
ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
/* check for optional prefix "<scheme>://" */
scheme = scheme_end = url;
p = strstr(url, "://");
if (p == NULL) {
p = url;
} else {
scheme_end = p;
if (scheme_end == scheme)
goto parse_err;
p += strlen("://");
}
/* parse optional "userinfo@" */
user = user_end = host = p;
host = strchr(p, '@');
if (host != NULL)
user_end = host++;
else
host = p;
/* parse host name/address as far as needed here */
if (host[0] == '[') {
/* ipv6 literal, which may include ':' */
host++;
host_end = strchr(host, ']');
if (host_end == NULL)
goto parse_err;
p = host_end + 1;
} else {
/* look for start of optional port, path, query, or fragment */
host_end = strchr(host, ':');
if (host_end == NULL)
host_end = strchr(host, '/');
if (host_end == NULL)
host_end = strchr(host, '?');
if (host_end == NULL)
host_end = strchr(host, '#');
if (host_end == NULL) /* the remaining string is just the hostname */
host_end = host + strlen(host);
p = host_end;
}
/* parse optional port specification starting with ':' */
port = "0"; /* default */
if (*p == ':')
port = ++p;
/* remaining port spec handling is also done for the default values */
/* make sure a decimal port number is given */
if (!sscanf(port, "%u", &portnum) || portnum > 65535) {
ERR_raise(ERR_LIB_HTTP, HTTP_R_INVALID_PORT_NUMBER);
goto err;
}
for (port_end = port; '0' <= *port_end && *port_end <= '9'; port_end++)
;
if (port == p) /* port was given explicitly */
p += port_end - port;
/* check for optional path starting with '/' or '?'. Else must start '#' */
path = p;
if (*path != '\0' && *path != '/' && *path != '?' && *path != '#') {
ERR_raise(ERR_LIB_HTTP, HTTP_R_INVALID_URL_PATH);
goto parse_err;
}
path_end = query = query_end = frag = frag_end = path + strlen(path);
/* parse optional "?query" */
tmp = strchr(p, '?');
if (tmp != NULL) {
p = tmp;
if (pquery != NULL) {
path_end = p;
query = p + 1;
}
}
/* parse optional "#fragment" */
tmp = strchr(p, '#');
if (tmp != NULL) {
if (query == path_end) /* we did not record a query component */
path_end = tmp;
query_end = tmp;
frag = tmp + 1;
}
if (!copy_substring(pscheme, scheme, scheme_end)
|| !copy_substring(phost, host, host_end)
|| !copy_substring(pport, port, port_end)
|| !copy_substring(puser, user, user_end)
|| !copy_substring(pquery, query, query_end)
|| !copy_substring(pfrag, frag, frag_end))
goto err;
if (pport_num != NULL)
*pport_num = (int)portnum;
if (*path == '/') {
if (!copy_substring(ppath, path, path_end))
goto err;
} else if (ppath != NULL) { /* must prepend '/' */
size_t buflen = 1 + path_end - path + 1;
if ((*ppath = OPENSSL_malloc(buflen)) == NULL)
goto err;
BIO_snprintf(*ppath, buflen, "/%s", path);
}
return 1;
parse_err:
ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_PARSING_URL);
err:
free_pstring(pscheme);
free_pstring(puser);
free_pstring(phost);
free_pstring(pport);
free_pstring(ppath);
free_pstring(pquery);
free_pstring(pfrag);
return 0;
}
int OSSL_HTTP_parse_url(const char *url, int *pssl, char **puser, char **phost,
char **pport, int *pport_num,
char **ppath, char **pquery, char **pfrag)
{
char *scheme, *port;
int ssl = 0, portnum;
init_pstring(pport);
if (pssl != NULL)
*pssl = 0;
if (!OSSL_parse_url(url, &scheme, puser, phost, &port, pport_num,
ppath, pquery, pfrag))
return 0;
/* check for optional HTTP scheme "http[s]" */
if (strcmp(scheme, OSSL_HTTPS_NAME) == 0) {
ssl = 1;
if (pssl != NULL)
*pssl = ssl;
} else if (*scheme != '\0' && strcmp(scheme, OSSL_HTTP_NAME) != 0) {
ERR_raise(ERR_LIB_HTTP, HTTP_R_INVALID_URL_SCHEME);
OPENSSL_free(scheme);
OPENSSL_free(port);
goto err;
}
OPENSSL_free(scheme);
if (strcmp(port, "0") == 0) {
/* set default port */
OPENSSL_free(port);
port = ssl ? OSSL_HTTPS_PORT : OSSL_HTTP_PORT;
if (!ossl_assert(sscanf(port, "%d", &portnum) == 1
|