1 33d32d1f 2020-12-25 op /*
  2 33d32d1f 2020-12-25 op  * Copyright (c) 2020 Omar Polo <op@omarpolo.com>
  3 33d32d1f 2020-12-25 op  *
  4 33d32d1f 2020-12-25 op  * Permission to use, copy, modify, and distribute this software for any
  5 33d32d1f 2020-12-25 op  * purpose with or without fee is hereby granted, provided that the above
  6 33d32d1f 2020-12-25 op  * copyright notice and this permission notice appear in all copies.
  7 33d32d1f 2020-12-25 op  *
  8 33d32d1f 2020-12-25 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 33d32d1f 2020-12-25 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 33d32d1f 2020-12-25 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 33d32d1f 2020-12-25 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 33d32d1f 2020-12-25 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 33d32d1f 2020-12-25 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 33d32d1f 2020-12-25 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 33d32d1f 2020-12-25 op  */
 16 33d32d1f 2020-12-25 op 
 17 33d32d1f 2020-12-25 op #include <ctype.h>
 18 33d32d1f 2020-12-25 op #include <string.h>
 19 33d32d1f 2020-12-25 op 
 20 33d32d1f 2020-12-25 op #include "gmid.h"
 21 33d32d1f 2020-12-25 op 
 22 33d32d1f 2020-12-25 op /*
 23 33d32d1f 2020-12-25 op  * Notes from RFC3986
 24 33d32d1f 2020-12-25 op  *
 25 33d32d1f 2020-12-25 op  * => gemini://tanso.net/rfc/rfc3986.txt
 26 33d32d1f 2020-12-25 op  *
 27 33d32d1f 2020-12-25 op  *
 28 33d32d1f 2020-12-25 op  * ABNF
 29 33d32d1f 2020-12-25 op  * ====
 30 33d32d1f 2020-12-25 op  *
 31 33d32d1f 2020-12-25 op  * pct-encoded	"%" HEXDIG HEXDIG
 32 33d32d1f 2020-12-25 op  *
 33 33d32d1f 2020-12-25 op  * reserved	= gen-delims / sub-delimis
 34 33d32d1f 2020-12-25 op  * gen-delims	= ":" / "/" / "?" / "#" / "[" / "]" / "@"
 35 33d32d1f 2020-12-25 op  * sub-delims	= "!" / "$" / "&" / "'" / "(" / ")"
 36 33d32d1f 2020-12-25 op  * 		/ "*" / "+" / "," / ";" / "="
 37 33d32d1f 2020-12-25 op  *
 38 33d32d1f 2020-12-25 op  * unreserved	= ALPHA / DIGIT / "-" / "." / "_" / "~"
 39 33d32d1f 2020-12-25 op  *
 40 33d32d1f 2020-12-25 op  * URI		= scheme ":" hier-part [ "?" query ] [ "#" fragment ]
 41 33d32d1f 2020-12-25 op  *
 42 33d32d1f 2020-12-25 op  * hier-part	= "//" authority path-abempty
 43 33d32d1f 2020-12-25 op  * 		/ path-absolute
 44 33d32d1f 2020-12-25 op  * 		/ path-rootless
 45 33d32d1f 2020-12-25 op  * 		/ path-empty
 46 33d32d1f 2020-12-25 op  *
 47 33d32d1f 2020-12-25 op  * scheme	= ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
 48 33d32d1f 2020-12-25 op  *
 49 33d32d1f 2020-12-25 op  * authority	= [ userinfo "@" ] host [ ":" port ]
 50 33d32d1f 2020-12-25 op  *
 51 33d32d1f 2020-12-25 op  * (note that userinfo isn't used for Gemini URL)
 52 33d32d1f 2020-12-25 op  *
 53 33d32d1f 2020-12-25 op  * host		= IP-literal / IPv4address / reg-name
 54 33d32d1f 2020-12-25 op  * reg-name	= *( unreserved / pct-encoded / sub-delims )
 55 33d32d1f 2020-12-25 op  *
 56 33d32d1f 2020-12-25 op  * port		= *DIGIT
 57 33d32d1f 2020-12-25 op  *
 58 33d32d1f 2020-12-25 op  * path		= path-abemty	; begins with "/" or is empty
 59 33d32d1f 2020-12-25 op  * 		/ path-absolute	; begins with "/" but not "//"
 60 33d32d1f 2020-12-25 op  * 		/ path-noscheme	; begins with a non-colon segment
 61 33d32d1f 2020-12-25 op  * 		/ path-rootless ; begins with a segment
 62 33d32d1f 2020-12-25 op  * 		/ path-empty	; zero characters
 63 33d32d1f 2020-12-25 op  *
 64 33d32d1f 2020-12-25 op  * path-abemty		= *( "/" segment )
 65 33d32d1f 2020-12-25 op  * path-absolute	= "/" [ segment-nz *( "/" segment ) ]
 66 33d32d1f 2020-12-25 op  * path-noscheme	= ; not used
 67 33d32d1f 2020-12-25 op  * path-rootless	= ; not used
 68 33d32d1f 2020-12-25 op  * path-empty		= ; not used
 69 33d32d1f 2020-12-25 op  *
 70 33d32d1f 2020-12-25 op  * segment		= *pchar
 71 33d32d1f 2020-12-25 op  * segment-nz	= 1*pchar
 72 33d32d1f 2020-12-25 op  * segment-nz-nc	= 1*( unreserved / pct-encoded / sub-delims / "@" )
 73 33d32d1f 2020-12-25 op  * pchar		= unreserved / pct-encoded / sub-delims / ":" / "@"
 74 33d32d1f 2020-12-25 op  *
 75 33d32d1f 2020-12-25 op  * query		= *( pchar / "/" / "?" )
 76 33d32d1f 2020-12-25 op  *
 77 33d32d1f 2020-12-25 op  * fragment		= *( pchar / "/" / "?" )
 78 33d32d1f 2020-12-25 op  *
 79 33d32d1f 2020-12-25 op  *
 80 33d32d1f 2020-12-25 op  * EXAMPLE
 81 33d32d1f 2020-12-25 op  * =======
 82 33d32d1f 2020-12-25 op  *
 83 33d32d1f 2020-12-25 op  *    foo://example.com:8042/over/there?name=ferret#nose
 84 33d32d1f 2020-12-25 op  *    \_/   \______________/\_________/ \_________/ \__/
 85 33d32d1f 2020-12-25 op  *     |           |            |            |        |
 86 33d32d1f 2020-12-25 op  *  scheme     authority       path        query   fragment
 87 33d32d1f 2020-12-25 op  *
 88 33d32d1f 2020-12-25 op  */
 89 33d32d1f 2020-12-25 op 
 90 33d32d1f 2020-12-25 op struct parser {
 91 33d32d1f 2020-12-25 op 	char		*uri;
 92 33d32d1f 2020-12-25 op 	struct uri	*parsed;
 93 33d32d1f 2020-12-25 op 	const char	*err;
 94 33d32d1f 2020-12-25 op };
 95 33d32d1f 2020-12-25 op 
 96 df6ca41d 2020-12-25 op #define CONT_BYTE(b) ((b & 0xC0) == 0x80)
 97 df6ca41d 2020-12-25 op 
 98 33d32d1f 2020-12-25 op /* XXX: these macros will expand multiple times their argument */
 99 33d32d1f 2020-12-25 op 
100 33d32d1f 2020-12-25 op #define UNRESERVED(p)				\
101 33d32d1f 2020-12-25 op 	(isalnum(p)				\
102 33d32d1f 2020-12-25 op 	    || p == '-'				\
103 33d32d1f 2020-12-25 op 	    || p == '.'				\
104 33d32d1f 2020-12-25 op 	    || p == '_'				\
105 33d32d1f 2020-12-25 op 	    || p == '~')
106 33d32d1f 2020-12-25 op 
107 33d32d1f 2020-12-25 op #define SUB_DELIMITERS(p)			\
108 33d32d1f 2020-12-25 op 	(p == '!'				\
109 33d32d1f 2020-12-25 op 	    || p == '$'				\
110 33d32d1f 2020-12-25 op 	    || p == '&'				\
111 33d32d1f 2020-12-25 op 	    || p == '\''			\
112 33d32d1f 2020-12-25 op 	    || p == '('				\
113 33d32d1f 2020-12-25 op 	    || p == ')'				\
114 33d32d1f 2020-12-25 op 	    || p == '*'				\
115 33d32d1f 2020-12-25 op 	    || p == '+'				\
116 33d32d1f 2020-12-25 op 	    || p == ','				\
117 33d32d1f 2020-12-25 op 	    || p == ';'				\
118 33d32d1f 2020-12-25 op 	    || p == '=')
119 df6ca41d 2020-12-25 op 
120 f722f3c5 2020-12-26 op /* NOTE: the increments are one less what they should be, because the
121 df6ca41d 2020-12-25 op  * caller will add one byte after we return. */
122 df6ca41d 2020-12-25 op static int
123 df6ca41d 2020-12-25 op valid_multibyte_utf8(struct parser *p)
124 df6ca41d 2020-12-25 op {
125 df6ca41d 2020-12-25 op 	uint32_t c;
126 df6ca41d 2020-12-25 op 	uint8_t s;
127 df6ca41d 2020-12-25 op 
128 df6ca41d 2020-12-25 op 	c = 0;
129 df6ca41d 2020-12-25 op 	s = *p->uri;
130 df6ca41d 2020-12-25 op 
131 df6ca41d 2020-12-25 op 	if ((s & 0xE0) == 0xC0) {
132 df6ca41d 2020-12-25 op 		if (!CONT_BYTE(*(p->uri+1)))
133 df6ca41d 2020-12-25 op 			return 0;
134 df6ca41d 2020-12-25 op 		c = ((s & 0x1F) << 6) | (*(p->uri+1) & 0x3F);
135 df6ca41d 2020-12-25 op 		p->uri += 1;
136 df6ca41d 2020-12-25 op 	} else if ((s & 0xF0) == 0xE0) {
137 df6ca41d 2020-12-25 op 		if (!CONT_BYTE(*(p->uri+1)) ||
138 df6ca41d 2020-12-25 op 		    !CONT_BYTE(*(p->uri+2)))
139 df6ca41d 2020-12-25 op 			return 0;
140 df6ca41d 2020-12-25 op 		c = (s & 0x0F) << 12
141 df6ca41d 2020-12-25 op 			| ((*(p->uri+1) & 0x3F) << 6)
142 df6ca41d 2020-12-25 op 			| ((*(p->uri+2) & 0x3F));
143 df6ca41d 2020-12-25 op 		p->uri += 2;
144 df6ca41d 2020-12-25 op 	} else if ((s & 0xF8) == 0xF0) {
145 df6ca41d 2020-12-25 op 		if (!CONT_BYTE(*(p->uri+1)) ||
146 df6ca41d 2020-12-25 op 		    !CONT_BYTE(*(p->uri+2)) ||
147 df6ca41d 2020-12-25 op 		    !CONT_BYTE(*(p->uri+3)))
148 df6ca41d 2020-12-25 op 			return 0;
149 df6ca41d 2020-12-25 op 		c = (s & 0x07) << 18
150 df6ca41d 2020-12-25 op 			| ((*(p->uri+1) & 0x3F) << 12)
151 df6ca41d 2020-12-25 op 			| ((*(p->uri+2) & 0x3F) << 6)
152 df6ca41d 2020-12-25 op 			| ((*(p->uri+3) & 0x3F));
153 df6ca41d 2020-12-25 op 		p->uri += 3;
154 df6ca41d 2020-12-25 op 	} else
155 df6ca41d 2020-12-25 op 		return 0;
156 33d32d1f 2020-12-25 op 
157 df6ca41d 2020-12-25 op 	return (((0x080 <= c) && (c <= 0x7FF))
158 df6ca41d 2020-12-25 op 	    || (((0x800 <= c) && (c <= 0xFFFF)))
159 df6ca41d 2020-12-25 op 	    || (((0x10000 <= c) && (c <= 0x10FFFF))));
160 df6ca41d 2020-12-25 op }
161 df6ca41d 2020-12-25 op 
162 33d32d1f 2020-12-25 op static int
163 33d32d1f 2020-12-25 op parse_pct_encoded(struct parser *p)
164 33d32d1f 2020-12-25 op {
165 33d32d1f 2020-12-25 op 	if (*p->uri != '%')
166 33d32d1f 2020-12-25 op 		return 0;
167 33d32d1f 2020-12-25 op 
168 33d32d1f 2020-12-25 op 	if (!isxdigit(*(p->uri+1)) || !isxdigit(*(p->uri+2))) {
169 33d32d1f 2020-12-25 op 		p->err = "illegal percent-encoding";
170 33d32d1f 2020-12-25 op 		return 0;
171 33d32d1f 2020-12-25 op 	}
172 33d32d1f 2020-12-25 op 
173 33d32d1f 2020-12-25 op 	sscanf(p->uri+1, "%2hhx", p->uri);
174 33d32d1f 2020-12-25 op 	memmove(p->uri+1, p->uri+3, strlen(p->uri+3)+1);
175 00781742 2020-12-25 op 	if (*p->uri == '\0') {
176 00781742 2020-12-25 op 		p->err = "illegal percent-encoding";
177 00781742 2020-12-25 op 		return 0;
178 00781742 2020-12-25 op 	}
179 33d32d1f 2020-12-25 op 
180 33d32d1f 2020-12-25 op 	return 1;
181 33d32d1f 2020-12-25 op }
182 33d32d1f 2020-12-25 op 
183 33d32d1f 2020-12-25 op /* ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) "://" */
184 33d32d1f 2020-12-25 op static int
185 33d32d1f 2020-12-25 op parse_scheme(struct parser *p)
186 33d32d1f 2020-12-25 op {
187 33d32d1f 2020-12-25 op 	p->parsed->schema = p->uri;
188 33d32d1f 2020-12-25 op 
189 33d32d1f 2020-12-25 op 	if (!isalpha(*p->uri)) {
190 33d32d1f 2020-12-25 op 		p->err = "illegal character in scheme";
191 33d32d1f 2020-12-25 op 		return 0;
192 33d32d1f 2020-12-25 op 	}
193 33d32d1f 2020-12-25 op 
194 33d32d1f 2020-12-25 op 	p->uri++;
195 33d32d1f 2020-12-25 op 	while (isalnum(*p->uri)
196 33d32d1f 2020-12-25 op 	    || *p->uri == '+'
197 33d32d1f 2020-12-25 op 	    || *p->uri == '-'
198 33d32d1f 2020-12-25 op 	    || *p->uri == '.')
199 33d32d1f 2020-12-25 op 		p->uri++;
200 33d32d1f 2020-12-25 op 
201 33d32d1f 2020-12-25 op 	if (*p->uri != ':') {
202 33d32d1f 2020-12-25 op 		p->err = "illegal character in scheme";
203 33d32d1f 2020-12-25 op 		return 0;
204 33d32d1f 2020-12-25 op 	}
205 33d32d1f 2020-12-25 op 
206 33d32d1f 2020-12-25 op 	*p->uri = '\0';
207 33d32d1f 2020-12-25 op 	if (*(++p->uri) != '/' || *(++p->uri) != '/') {
208 33d32d1f 2020-12-25 op 		p->err = "invalid marker after scheme";
209 33d32d1f 2020-12-25 op 		return 0;
210 33d32d1f 2020-12-25 op 	}
211 33d32d1f 2020-12-25 op 
212 33d32d1f 2020-12-25 op 	p->uri++;
213 33d32d1f 2020-12-25 op 	return 1;
214 33d32d1f 2020-12-25 op }
215 33d32d1f 2020-12-25 op 
216 33d32d1f 2020-12-25 op /* *DIGIT */
217 33d32d1f 2020-12-25 op static int
218 33d32d1f 2020-12-25 op parse_port(struct parser *p)
219 33d32d1f 2020-12-25 op {
220 33d32d1f 2020-12-25 op 	uint32_t i = 0;
221 33d32d1f 2020-12-25 op 
222 33d32d1f 2020-12-25 op 	p->parsed->port = p->uri;
223 33d32d1f 2020-12-25 op 
224 33d32d1f 2020-12-25 op 	for (; isdigit(*p->uri); p->uri++) {
225 33d32d1f 2020-12-25 op 		i = i * 10 + *p->uri - '0';
226 33d32d1f 2020-12-25 op 		if (i > UINT16_MAX) {
227 33d32d1f 2020-12-25 op 			p->err = "port number too large";
228 33d32d1f 2020-12-25 op 			return 0;
229 33d32d1f 2020-12-25 op 		}
230 33d32d1f 2020-12-25 op 	}
231 33d32d1f 2020-12-25 op 
232 33d32d1f 2020-12-25 op 	if (*p->uri != '/' && *p->uri != '\0') {
233 33d32d1f 2020-12-25 op 		p->err = "illegal character in port number";
234 33d32d1f 2020-12-25 op 		return 0;
235 33d32d1f 2020-12-25 op 	}
236 33d32d1f 2020-12-25 op 
237 33d32d1f 2020-12-25 op 	p->parsed->port_no = i;
238 33d32d1f 2020-12-25 op 
239 33d32d1f 2020-12-25 op 	if (*p->uri != '\0') {
240 33d32d1f 2020-12-25 op 		*p->uri = '\0';
241 33d32d1f 2020-12-25 op 		p->uri++;
242 33d32d1f 2020-12-25 op 	}
243 33d32d1f 2020-12-25 op 
244 33d32d1f 2020-12-25 op 	return 1;
245 33d32d1f 2020-12-25 op }
246 33d32d1f 2020-12-25 op 
247 33d32d1f 2020-12-25 op /* TODO: add support for ip-literal and ipv4addr ? */
248 33d32d1f 2020-12-25 op /* *( unreserved / sub-delims / pct-encoded ) */
249 33d32d1f 2020-12-25 op static int
250 33d32d1f 2020-12-25 op parse_authority(struct parser *p)
251 33d32d1f 2020-12-25 op {
252 33d32d1f 2020-12-25 op 	p->parsed->host = p->uri;
253 33d32d1f 2020-12-25 op 
254 33d32d1f 2020-12-25 op 	while (UNRESERVED(*p->uri)
255 33d32d1f 2020-12-25 op 	    || SUB_DELIMITERS(*p->uri)
256 33d32d1f 2020-12-25 op 	    || parse_pct_encoded(p))
257 33d32d1f 2020-12-25 op 		p->uri++;
258 33d32d1f 2020-12-25 op 
259 00781742 2020-12-25 op 	if (p->err != NULL)
260 00781742 2020-12-25 op 		return 0;
261 00781742 2020-12-25 op 
262 33d32d1f 2020-12-25 op 	if (*p->uri == ':') {
263 33d32d1f 2020-12-25 op 		*p->uri = '\0';
264 33d32d1f 2020-12-25 op 		p->uri++;
265 33d32d1f 2020-12-25 op 		return parse_port(p);
266 33d32d1f 2020-12-25 op 	}
267 33d32d1f 2020-12-25 op 
268 33d32d1f 2020-12-25 op 	if (*p->uri == '/') {
269 33d32d1f 2020-12-25 op 		*p->uri = '\0';
270 33d32d1f 2020-12-25 op 		p->uri++;
271 33d32d1f 2020-12-25 op 		return 1;
272 33d32d1f 2020-12-25 op 	}
273 33d32d1f 2020-12-25 op 
274 33d32d1f 2020-12-25 op 	if (*p->uri == '\0')
275 33d32d1f 2020-12-25 op 		return 1;
276 33d32d1f 2020-12-25 op 
277 33d32d1f 2020-12-25 op 	p->err = "illegal character in authority section";
278 33d32d1f 2020-12-25 op 	return 0;
279 33d32d1f 2020-12-25 op }
280 33d32d1f 2020-12-25 op 
281 33d32d1f 2020-12-25 op /* Routine for path_clean.  Elide the pointed .. with the preceding
282 33d32d1f 2020-12-25 op  * element.  Return 0 if it's not possible.  incr is the length of
283 33d32d1f 2020-12-25 op  * the increment, 3 for ../ and 2 for .. */
284 33d32d1f 2020-12-25 op static int
285 33d32d1f 2020-12-25 op path_elide_dotdot(char *path, char *i, int incr)
286 33d32d1f 2020-12-25 op {
287 33d32d1f 2020-12-25 op 	char *j;
288 33d32d1f 2020-12-25 op 
289 33d32d1f 2020-12-25 op 	if (i == path)
290 33d32d1f 2020-12-25 op 		return 0;
291 33d32d1f 2020-12-25 op 	for (j = i-2; j != path && *j != '/'; j--)
292 33d32d1f 2020-12-25 op                 /* noop */ ;
293 33d32d1f 2020-12-25 op 	if (*j == '/')
294 33d32d1f 2020-12-25 op 		j++;
295 33d32d1f 2020-12-25 op 	i += incr;
296 33d32d1f 2020-12-25 op 	memmove(j, i, strlen(i)+1);
297 33d32d1f 2020-12-25 op 	return 1;
298 33d32d1f 2020-12-25 op }
299 33d32d1f 2020-12-25 op 
300 33d32d1f 2020-12-25 op /*
301 33d32d1f 2020-12-25 op  * Use an algorithm similar to the one implemented in go' path.Clean:
302 33d32d1f 2020-12-25 op  *
303 33d32d1f 2020-12-25 op  * 1. Replace multiple slashes with a single slash
304 33d32d1f 2020-12-25 op  * 2. Eliminate each . path name element
305 33d32d1f 2020-12-25 op  * 3. Eliminate each inner .. along with the non-.. element that precedes it
306 33d32d1f 2020-12-25 op  * 4. Eliminate trailing .. if possible or error (go would only discard)
307 33d32d1f 2020-12-25 op  *
308 33d32d1f 2020-12-25 op  * Unlike path.Clean, this function return the empty string if the
309 33d32d1f 2020-12-25 op  * original path is equivalent to "/".
310 33d32d1f 2020-12-25 op  */
311 33d32d1f 2020-12-25 op static int
312 33d32d1f 2020-12-25 op path_clean(char *path)
313 33d32d1f 2020-12-25 op {
314 33d32d1f 2020-12-25 op 	char *i;
315 33d32d1f 2020-12-25 op 
316 33d32d1f 2020-12-25 op 	/* 1. replace multiple slashes with a single one */
317 33d32d1f 2020-12-25 op 	for (i = path; *i; ++i) {
318 33d32d1f 2020-12-25 op 		if (*i == '/' && *(i+1) == '/') {
319 33d32d1f 2020-12-25 op 			memmove(i, i+1, strlen(i)); /* move also the \0 */
320 33d32d1f 2020-12-25 op 			i--;
321 33d32d1f 2020-12-25 op 		}
322 33d32d1f 2020-12-25 op 	}
323 33d32d1f 2020-12-25 op 
324 33d32d1f 2020-12-25 op 	/* 2. eliminate each . path name element */
325 33d32d1f 2020-12-25 op 	for (i = path; *i; ++i) {
326 33d32d1f 2020-12-25 op 		if ((i == path || *i == '/') && *(i+1) == '.' &&
327 33d32d1f 2020-12-25 op 		    *(i+2) == '/') {
328 33d32d1f 2020-12-25 op 			/* move also the \0 */
329 33d32d1f 2020-12-25 op 			memmove(i, i+2, strlen(i)-1);
330 33d32d1f 2020-12-25 op 			i--;
331 33d32d1f 2020-12-25 op 		}
332 33d32d1f 2020-12-25 op 	}
333 33d32d1f 2020-12-25 op 	if (!strcmp(path, ".") || !strcmp(path, "/.")) {
334 33d32d1f 2020-12-25 op 		*path = '\0';
335 33d32d1f 2020-12-25 op 		return 1;
336 33d32d1f 2020-12-25 op 	}
337 33d32d1f 2020-12-25 op 
338 33d32d1f 2020-12-25 op 	/* 3. eliminate each inner .. along with the preceding non-.. */
339 33d32d1f 2020-12-25 op 	for (i = strstr(path, "../"); i != NULL; i = strstr(path, ".."))
340 33d32d1f 2020-12-25 op 		if (!path_elide_dotdot(path, i, 3))
341 33d32d1f 2020-12-25 op 			return 0;
342 33d32d1f 2020-12-25 op 
343 33d32d1f 2020-12-25 op 	/* 4. eliminate trailing ..*/
344 33d32d1f 2020-12-25 op 	if ((i = strstr(path, "..")) != NULL)
345 33d32d1f 2020-12-25 op 		if (!path_elide_dotdot(path, i, 2))
346 33d32d1f 2020-12-25 op 			return 0;
347 33d32d1f 2020-12-25 op 
348 33d32d1f 2020-12-25 op 	return 1;
349 33d32d1f 2020-12-25 op }
350 33d32d1f 2020-12-25 op 
351 33d32d1f 2020-12-25 op static int
352 33d32d1f 2020-12-25 op parse_query(struct parser *p)
353 33d32d1f 2020-12-25 op {
354 33d32d1f 2020-12-25 op 	p->parsed->query = p->uri;
355 33d32d1f 2020-12-25 op 	if (*p->uri == '\0')
356 33d32d1f 2020-12-25 op 		return 1;
357 33d32d1f 2020-12-25 op 
358 33d32d1f 2020-12-25 op 	while (UNRESERVED(*p->uri)
359 33d32d1f 2020-12-25 op 	    || SUB_DELIMITERS(*p->uri)
360 33d32d1f 2020-12-25 op 	    || *p->uri == '/'
361 33d32d1f 2020-12-25 op 	    || *p->uri == '?'
362 df6ca41d 2020-12-25 op 	    || parse_pct_encoded(p)
363 df6ca41d 2020-12-25 op 	    || valid_multibyte_utf8(p))
364 33d32d1f 2020-12-25 op 		p->uri++;
365 33d32d1f 2020-12-25 op 
366 00781742 2020-12-25 op 	if (p->err != NULL)
367 00781742 2020-12-25 op 		return 0;
368 00781742 2020-12-25 op 
369 33d32d1f 2020-12-25 op 	if (*p->uri != '\0' && *p->uri != '#') {
370 33d32d1f 2020-12-25 op 		p->err = "illegal character in query";
371 33d32d1f 2020-12-25 op 		return 0;
372 33d32d1f 2020-12-25 op 	}
373 33d32d1f 2020-12-25 op 
374 33d32d1f 2020-12-25 op 	if (*p->uri != '\0') {
375 33d32d1f 2020-12-25 op 		*p->uri = '\0';
376 33d32d1f 2020-12-25 op 		p->uri++;
377 33d32d1f 2020-12-25 op 	}
378 33d32d1f 2020-12-25 op 
379 33d32d1f 2020-12-25 op 	return 1;
380 33d32d1f 2020-12-25 op }
381 33d32d1f 2020-12-25 op 
382 33d32d1f 2020-12-25 op /* don't even bother */
383 33d32d1f 2020-12-25 op static int
384 33d32d1f 2020-12-25 op parse_fragment(struct parser *p)
385 33d32d1f 2020-12-25 op {
386 33d32d1f 2020-12-25 op 	p->parsed->fragment = p->uri;
387 33d32d1f 2020-12-25 op 	return 1;
388 33d32d1f 2020-12-25 op }
389 33d32d1f 2020-12-25 op 
390 33d32d1f 2020-12-25 op /* XXX: is it too broad? */
391 33d32d1f 2020-12-25 op /* *(pchar / "/") */
392 33d32d1f 2020-12-25 op static int
393 33d32d1f 2020-12-25 op parse_path(struct parser *p)
394 33d32d1f 2020-12-25 op {
395 33d32d1f 2020-12-25 op 	char c;
396 33d32d1f 2020-12-25 op 
397 33d32d1f 2020-12-25 op 	p->parsed->path = p->uri;
398 33d32d1f 2020-12-25 op 	if (*p->uri == '\0') {
399 33d32d1f 2020-12-25 op 		p->parsed->query = p->parsed->fragment = p->uri;
400 33d32d1f 2020-12-25 op 		return 1;
401 33d32d1f 2020-12-25 op 	}
402 33d32d1f 2020-12-25 op 
403 33d32d1f 2020-12-25 op 	while (UNRESERVED(*p->uri)
404 33d32d1f 2020-12-25 op 	    || SUB_DELIMITERS(*p->uri)
405 33d32d1f 2020-12-25 op 	    || *p->uri == '/'
406 df6ca41d 2020-12-25 op 	    || parse_pct_encoded(p)
407 df6ca41d 2020-12-25 op 	    || valid_multibyte_utf8(p))
408 33d32d1f 2020-12-25 op 		p->uri++;
409 33d32d1f 2020-12-25 op 
410 00781742 2020-12-25 op 	if (p->err != NULL)
411 00781742 2020-12-25 op 		return 0;
412 00781742 2020-12-25 op 
413 33d32d1f 2020-12-25 op 	if (*p->uri != '\0' && *p->uri != '?' && *p->uri != '#') {
414 33d32d1f 2020-12-25 op 		p->err = "illegal character in path";
415 33d32d1f 2020-12-25 op 		return 0;
416 33d32d1f 2020-12-25 op 	}
417 33d32d1f 2020-12-25 op 
418 33d32d1f 2020-12-25 op 	if (*p->uri != '\0') {
419 33d32d1f 2020-12-25 op 		c = *p->uri;
420 33d32d1f 2020-12-25 op 		*p->uri = '\0';
421 33d32d1f 2020-12-25 op 		p->uri++;
422 33d32d1f 2020-12-25 op 
423 33d32d1f 2020-12-25 op 		if (c == '#') {
424 33d32d1f 2020-12-25 op 			if (!parse_fragment(p))
425 33d32d1f 2020-12-25 op 				return 0;
426 33d32d1f 2020-12-25 op 		} else
427 33d32d1f 2020-12-25 op 			if (!parse_query(p) || !parse_fragment(p))
428 33d32d1f 2020-12-25 op 				return 0;
429 33d32d1f 2020-12-25 op 	}
430 33d32d1f 2020-12-25 op 
431 33d32d1f 2020-12-25 op 	if (!path_clean(p->parsed->path)) {
432 33d32d1f 2020-12-25 op 		p->err = "illegal path";
433 33d32d1f 2020-12-25 op 		return 0;
434 33d32d1f 2020-12-25 op 	}
435 33d32d1f 2020-12-25 op 
436 33d32d1f 2020-12-25 op 	return 1;
437 33d32d1f 2020-12-25 op }
438 33d32d1f 2020-12-25 op 
439 33d32d1f 2020-12-25 op int
440 33d32d1f 2020-12-25 op parse_uri(char *uri, struct uri *ret, const char **err_ret)
441 33d32d1f 2020-12-25 op {
442 33d32d1f 2020-12-25 op 	char *end;
443 33d32d1f 2020-12-25 op 	struct parser p = {uri, ret, NULL};
444 33d32d1f 2020-12-25 op 
445 33d32d1f 2020-12-25 op 	bzero(ret, sizeof(*ret));
446 33d32d1f 2020-12-25 op 
447 33d32d1f 2020-12-25 op 	/* initialize optional stuff to the empty string */
448 33d32d1f 2020-12-25 op 	end = uri + strlen(uri);
449 33d32d1f 2020-12-25 op 	p.parsed->port = end;
450 33d32d1f 2020-12-25 op 	p.parsed->path = end;
451 33d32d1f 2020-12-25 op 	p.parsed->query = end;
452 33d32d1f 2020-12-25 op 	p.parsed->fragment = end;
453 33d32d1f 2020-12-25 op 
454 33d32d1f 2020-12-25 op 	if (!parse_scheme(&p) || !parse_authority(&p) || !parse_path(&p)) {
455 33d32d1f 2020-12-25 op 		*err_ret = p.err;
456 33d32d1f 2020-12-25 op 		return 0;
457 33d32d1f 2020-12-25 op 	}
458 33d32d1f 2020-12-25 op 
459 33d32d1f 2020-12-25 op 	*err_ret = NULL;
460 33d32d1f 2020-12-25 op 	return 1;
461 33d32d1f 2020-12-25 op }
462 33d32d1f 2020-12-25 op 
463 33d32d1f 2020-12-25 op int
464 33d32d1f 2020-12-25 op trim_req_uri(char *uri)
465 33d32d1f 2020-12-25 op {
466 33d32d1f 2020-12-25 op 	char *i;
467 33d32d1f 2020-12-25 op 
468 33d32d1f 2020-12-25 op 	if ((i = strstr(uri, "\r\n")) == NULL)
469 33d32d1f 2020-12-25 op 		return 0;
470 33d32d1f 2020-12-25 op 	*i = '\0';
471 33d32d1f 2020-12-25 op 	return 1;
472 33d32d1f 2020-12-25 op }