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Date:: Fri Dec 25 12:13:12 2020 UTC
Message:: implement a valid RFC3986 (URI) parser Up until now I used a "poor man" approach: the uri parser is barely a parser, it tries to extract the path from the request, with some minor checking, and that's all. This obviously is not RFC3986-compliant. The new RFC3986 (URI) parser should be fully compliant. It may accept some invalid URI, but shouldn't reject or mis-parse valid URI. (in particular, the rule for the path is way more relaxed in this parser than it is in the RFC text). A difference with RFC3986 is that we don't even try to parse the (optional) userinfo part of a URI: following the Gemini spec we treat it as an error. A further caveats is that %2F in the path part of the URI is indistinguishable from a literal '/': this is NOT conforming, but due to the scope and use of gmid, I don't see how treat a %2F sequence in the path (reject the URI?).
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  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 33d32d1f 2020-12-25 op /* XXX: these macros will expand multiple times their argument */
 97 33d32d1f 2020-12-25 op 
 98 33d32d1f 2020-12-25 op #define UNRESERVED(p)				\
 99 33d32d1f 2020-12-25 op 	(isalnum(p)				\
100 33d32d1f 2020-12-25 op 	    || p == '-'				\
101 33d32d1f 2020-12-25 op 	    || p == '.'				\
102 33d32d1f 2020-12-25 op 	    || p == '_'				\
103 33d32d1f 2020-12-25 op 	    || p == '~')
104 33d32d1f 2020-12-25 op 
105 33d32d1f 2020-12-25 op #define SUB_DELIMITERS(p)			\
106 33d32d1f 2020-12-25 op 	(p == '!'				\
107 33d32d1f 2020-12-25 op 	    || 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 
118 33d32d1f 2020-12-25 op static int
119 33d32d1f 2020-12-25 op parse_pct_encoded(struct parser *p)
120 33d32d1f 2020-12-25 op {
121 33d32d1f 2020-12-25 op 	if (*p->uri != '%')
122 33d32d1f 2020-12-25 op 		return 0;
123 33d32d1f 2020-12-25 op 
124 33d32d1f 2020-12-25 op 	if (!isxdigit(*(p->uri+1)) || !isxdigit(*(p->uri+2))) {
125 33d32d1f 2020-12-25 op 		p->err = "illegal percent-encoding";
126 33d32d1f 2020-12-25 op 		return 0;
127 33d32d1f 2020-12-25 op 	}
128 33d32d1f 2020-12-25 op 
129 33d32d1f 2020-12-25 op 	sscanf(p->uri+1, "%2hhx", p->uri);
130 33d32d1f 2020-12-25 op 	memmove(p->uri+1, p->uri+3, strlen(p->uri+3)+1);
131 33d32d1f 2020-12-25 op 
132 33d32d1f 2020-12-25 op 	return 1;
133 33d32d1f 2020-12-25 op }
134 33d32d1f 2020-12-25 op 
135 33d32d1f 2020-12-25 op /* ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) "://" */
136 33d32d1f 2020-12-25 op static int
137 33d32d1f 2020-12-25 op parse_scheme(struct parser *p)
138 33d32d1f 2020-12-25 op {
139 33d32d1f 2020-12-25 op 	p->parsed->schema = p->uri;
140 33d32d1f 2020-12-25 op 
141 33d32d1f 2020-12-25 op 	if (!isalpha(*p->uri)) {
142 33d32d1f 2020-12-25 op 		p->err = "illegal character in scheme";
143 33d32d1f 2020-12-25 op 		return 0;
144 33d32d1f 2020-12-25 op 	}
145 33d32d1f 2020-12-25 op 
146 33d32d1f 2020-12-25 op 	p->uri++;
147 33d32d1f 2020-12-25 op 	while (isalnum(*p->uri)
148 33d32d1f 2020-12-25 op 	    || *p->uri == '+'
149 33d32d1f 2020-12-25 op 	    || *p->uri == '-'
150 33d32d1f 2020-12-25 op 	    || *p->uri == '.')
151 33d32d1f 2020-12-25 op 		p->uri++;
152 33d32d1f 2020-12-25 op 
153 33d32d1f 2020-12-25 op 	if (*p->uri != ':') {
154 33d32d1f 2020-12-25 op 		p->err = "illegal character in scheme";
155 33d32d1f 2020-12-25 op 		return 0;
156 33d32d1f 2020-12-25 op 	}
157 33d32d1f 2020-12-25 op 
158 33d32d1f 2020-12-25 op 	*p->uri = '\0';
159 33d32d1f 2020-12-25 op 	if (*(++p->uri) != '/' || *(++p->uri) != '/') {
160 33d32d1f 2020-12-25 op 		p->err = "invalid marker after scheme";
161 33d32d1f 2020-12-25 op 		return 0;
162 33d32d1f 2020-12-25 op 	}
163 33d32d1f 2020-12-25 op 
164 33d32d1f 2020-12-25 op 	p->uri++;
165 33d32d1f 2020-12-25 op 	return 1;
166 33d32d1f 2020-12-25 op }
167 33d32d1f 2020-12-25 op 
168 33d32d1f 2020-12-25 op /* *DIGIT */
169 33d32d1f 2020-12-25 op static int
170 33d32d1f 2020-12-25 op parse_port(struct parser *p)
171 33d32d1f 2020-12-25 op {
172 33d32d1f 2020-12-25 op 	uint32_t i = 0;
173 33d32d1f 2020-12-25 op 
174 33d32d1f 2020-12-25 op 	p->parsed->port = p->uri;
175 33d32d1f 2020-12-25 op 
176 33d32d1f 2020-12-25 op 	for (; isdigit(*p->uri); p->uri++) {
177 33d32d1f 2020-12-25 op 		i = i * 10 + *p->uri - '0';
178 33d32d1f 2020-12-25 op 		if (i > UINT16_MAX) {
179 33d32d1f 2020-12-25 op 			p->err = "port number too large";
180 33d32d1f 2020-12-25 op 			return 0;
181 33d32d1f 2020-12-25 op 		}
182 33d32d1f 2020-12-25 op 	}
183 33d32d1f 2020-12-25 op 
184 33d32d1f 2020-12-25 op 	if (*p->uri != '/' && *p->uri != '\0') {
185 33d32d1f 2020-12-25 op 		p->err = "illegal character in port number";
186 33d32d1f 2020-12-25 op 		return 0;
187 33d32d1f 2020-12-25 op 	}
188 33d32d1f 2020-12-25 op 
189 33d32d1f 2020-12-25 op 	p->parsed->port_no = i;
190 33d32d1f 2020-12-25 op 
191 33d32d1f 2020-12-25 op 	if (*p->uri != '\0') {
192 33d32d1f 2020-12-25 op 		*p->uri = '\0';
193 33d32d1f 2020-12-25 op 		p->uri++;
194 33d32d1f 2020-12-25 op 	}
195 33d32d1f 2020-12-25 op 
196 33d32d1f 2020-12-25 op 	return 1;
197 33d32d1f 2020-12-25 op }
198 33d32d1f 2020-12-25 op 
199 33d32d1f 2020-12-25 op /* TODO: add support for ip-literal and ipv4addr ? */
200 33d32d1f 2020-12-25 op /* *( unreserved / sub-delims / pct-encoded ) */
201 33d32d1f 2020-12-25 op static int
202 33d32d1f 2020-12-25 op parse_authority(struct parser *p)
203 33d32d1f 2020-12-25 op {
204 33d32d1f 2020-12-25 op 	p->parsed->host = p->uri;
205 33d32d1f 2020-12-25 op 
206 33d32d1f 2020-12-25 op 	while (UNRESERVED(*p->uri)
207 33d32d1f 2020-12-25 op 	    || SUB_DELIMITERS(*p->uri)
208 33d32d1f 2020-12-25 op 	    || parse_pct_encoded(p))
209 33d32d1f 2020-12-25 op 		p->uri++;
210 33d32d1f 2020-12-25 op 
211 33d32d1f 2020-12-25 op 	if (*p->uri == ':') {
212 33d32d1f 2020-12-25 op 		*p->uri = '\0';
213 33d32d1f 2020-12-25 op 		p->uri++;
214 33d32d1f 2020-12-25 op 		return parse_port(p);
215 33d32d1f 2020-12-25 op 	}
216 33d32d1f 2020-12-25 op 
217 33d32d1f 2020-12-25 op 	if (*p->uri == '/') {
218 33d32d1f 2020-12-25 op 		*p->uri = '\0';
219 33d32d1f 2020-12-25 op 		p->uri++;
220 33d32d1f 2020-12-25 op 		return 1;
221 33d32d1f 2020-12-25 op 	}
222 33d32d1f 2020-12-25 op 
223 33d32d1f 2020-12-25 op 	if (*p->uri == '\0')
224 33d32d1f 2020-12-25 op 		return 1;
225 33d32d1f 2020-12-25 op 
226 33d32d1f 2020-12-25 op 	p->err = "illegal character in authority section";
227 33d32d1f 2020-12-25 op 	return 0;
228 33d32d1f 2020-12-25 op }
229 33d32d1f 2020-12-25 op 
230 33d32d1f 2020-12-25 op /* Routine for path_clean.  Elide the pointed .. with the preceding
231 33d32d1f 2020-12-25 op  * element.  Return 0 if it's not possible.  incr is the length of
232 33d32d1f 2020-12-25 op  * the increment, 3 for ../ and 2 for .. */
233 33d32d1f 2020-12-25 op static int
234 33d32d1f 2020-12-25 op path_elide_dotdot(char *path, char *i, int incr)
235 33d32d1f 2020-12-25 op {
236 33d32d1f 2020-12-25 op 	char *j;
237 33d32d1f 2020-12-25 op 
238 33d32d1f 2020-12-25 op 	if (i == path)
239 33d32d1f 2020-12-25 op 		return 0;
240 33d32d1f 2020-12-25 op 	for (j = i-2; j != path && *j != '/'; j--)
241 33d32d1f 2020-12-25 op                 /* noop */ ;
242 33d32d1f 2020-12-25 op 	if (*j == '/')
243 33d32d1f 2020-12-25 op 		j++;
244 33d32d1f 2020-12-25 op 	i += incr;
245 33d32d1f 2020-12-25 op 	memmove(j, i, strlen(i)+1);
246 33d32d1f 2020-12-25 op 	return 1;
247 33d32d1f 2020-12-25 op }
248 33d32d1f 2020-12-25 op 
249 33d32d1f 2020-12-25 op /*
250 33d32d1f 2020-12-25 op  * Use an algorithm similar to the one implemented in go' path.Clean:
251 33d32d1f 2020-12-25 op  *
252 33d32d1f 2020-12-25 op  * 1. Replace multiple slashes with a single slash
253 33d32d1f 2020-12-25 op  * 2. Eliminate each . path name element
254 33d32d1f 2020-12-25 op  * 3. Eliminate each inner .. along with the non-.. element that precedes it
255 33d32d1f 2020-12-25 op  * 4. Eliminate trailing .. if possible or error (go would only discard)
256 33d32d1f 2020-12-25 op  *
257 33d32d1f 2020-12-25 op  * Unlike path.Clean, this function return the empty string if the
258 33d32d1f 2020-12-25 op  * original path is equivalent to "/".
259 33d32d1f 2020-12-25 op  */
260 33d32d1f 2020-12-25 op static int
261 33d32d1f 2020-12-25 op path_clean(char *path)
262 33d32d1f 2020-12-25 op {
263 33d32d1f 2020-12-25 op 	char *i;
264 33d32d1f 2020-12-25 op 
265 33d32d1f 2020-12-25 op 	/* 1. replace multiple slashes with a single one */
266 33d32d1f 2020-12-25 op 	for (i = path; *i; ++i) {
267 33d32d1f 2020-12-25 op 		if (*i == '/' && *(i+1) == '/') {
268 33d32d1f 2020-12-25 op 			memmove(i, i+1, strlen(i)); /* move also the \0 */
269 33d32d1f 2020-12-25 op 			i--;
270 33d32d1f 2020-12-25 op 		}
271 33d32d1f 2020-12-25 op 	}
272 33d32d1f 2020-12-25 op 
273 33d32d1f 2020-12-25 op 	/* 2. eliminate each . path name element */
274 33d32d1f 2020-12-25 op 	for (i = path; *i; ++i) {
275 33d32d1f 2020-12-25 op 		if ((i == path || *i == '/') && *(i+1) == '.' &&
276 33d32d1f 2020-12-25 op 		    *(i+2) == '/') {
277 33d32d1f 2020-12-25 op 			/* move also the \0 */
278 33d32d1f 2020-12-25 op 			memmove(i, i+2, strlen(i)-1);
279 33d32d1f 2020-12-25 op 			i--;
280 33d32d1f 2020-12-25 op 		}
281 33d32d1f 2020-12-25 op 	}
282 33d32d1f 2020-12-25 op 	if (!strcmp(path, ".") || !strcmp(path, "/.")) {
283 33d32d1f 2020-12-25 op 		*path = '\0';
284 33d32d1f 2020-12-25 op 		return 1;
285 33d32d1f 2020-12-25 op 	}
286 33d32d1f 2020-12-25 op 
287 33d32d1f 2020-12-25 op 	/* 3. eliminate each inner .. along with the preceding non-.. */
288 33d32d1f 2020-12-25 op 	for (i = strstr(path, "../"); i != NULL; i = strstr(path, ".."))
289 33d32d1f 2020-12-25 op 		if (!path_elide_dotdot(path, i, 3))
290 33d32d1f 2020-12-25 op 			return 0;
291 33d32d1f 2020-12-25 op 
292 33d32d1f 2020-12-25 op 	/* 4. eliminate trailing ..*/
293 33d32d1f 2020-12-25 op 	if ((i = strstr(path, "..")) != NULL)
294 33d32d1f 2020-12-25 op 		if (!path_elide_dotdot(path, i, 2))
295 33d32d1f 2020-12-25 op 			return 0;
296 33d32d1f 2020-12-25 op 
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 static int
301 33d32d1f 2020-12-25 op parse_query(struct parser *p)
302 33d32d1f 2020-12-25 op {
303 33d32d1f 2020-12-25 op 	p->parsed->query = p->uri;
304 33d32d1f 2020-12-25 op 	if (*p->uri == '\0')
305 33d32d1f 2020-12-25 op 		return 1;
306 33d32d1f 2020-12-25 op 
307 33d32d1f 2020-12-25 op 	while (UNRESERVED(*p->uri)
308 33d32d1f 2020-12-25 op 	    || SUB_DELIMITERS(*p->uri)
309 33d32d1f 2020-12-25 op 	    || *p->uri == '/'
310 33d32d1f 2020-12-25 op 	    || *p->uri == '?'
311 33d32d1f 2020-12-25 op 	    || parse_pct_encoded(p))
312 33d32d1f 2020-12-25 op 		p->uri++;
313 33d32d1f 2020-12-25 op 
314 33d32d1f 2020-12-25 op 	if (*p->uri != '\0' && *p->uri != '#') {
315 33d32d1f 2020-12-25 op 		p->err = "illegal character in query";
316 33d32d1f 2020-12-25 op 		return 0;
317 33d32d1f 2020-12-25 op 	}
318 33d32d1f 2020-12-25 op 
319 33d32d1f 2020-12-25 op 	if (*p->uri != '\0') {
320 33d32d1f 2020-12-25 op 		*p->uri = '\0';
321 33d32d1f 2020-12-25 op 		p->uri++;
322 33d32d1f 2020-12-25 op 	}
323 33d32d1f 2020-12-25 op 
324 33d32d1f 2020-12-25 op 	return 1;
325 33d32d1f 2020-12-25 op }
326 33d32d1f 2020-12-25 op 
327 33d32d1f 2020-12-25 op /* don't even bother */
328 33d32d1f 2020-12-25 op static int
329 33d32d1f 2020-12-25 op parse_fragment(struct parser *p)
330 33d32d1f 2020-12-25 op {
331 33d32d1f 2020-12-25 op 	p->parsed->fragment = p->uri;
332 33d32d1f 2020-12-25 op 	return 1;
333 33d32d1f 2020-12-25 op }
334 33d32d1f 2020-12-25 op 
335 33d32d1f 2020-12-25 op /* XXX: is it too broad? */
336 33d32d1f 2020-12-25 op /* *(pchar / "/") */
337 33d32d1f 2020-12-25 op static int
338 33d32d1f 2020-12-25 op parse_path(struct parser *p)
339 33d32d1f 2020-12-25 op {
340 33d32d1f 2020-12-25 op 	char c;
341 33d32d1f 2020-12-25 op 
342 33d32d1f 2020-12-25 op 	p->parsed->path = p->uri;
343 33d32d1f 2020-12-25 op 	if (*p->uri == '\0') {
344 33d32d1f 2020-12-25 op 		p->parsed->query = p->parsed->fragment = p->uri;
345 33d32d1f 2020-12-25 op 		return 1;
346 33d32d1f 2020-12-25 op 	}
347 33d32d1f 2020-12-25 op 
348 33d32d1f 2020-12-25 op 	while (UNRESERVED(*p->uri)
349 33d32d1f 2020-12-25 op 	    || SUB_DELIMITERS(*p->uri)
350 33d32d1f 2020-12-25 op 	    || *p->uri == '/'
351 33d32d1f 2020-12-25 op 	    || parse_pct_encoded(p))
352 33d32d1f 2020-12-25 op 		p->uri++;
353 33d32d1f 2020-12-25 op 
354 33d32d1f 2020-12-25 op 	if (*p->uri != '\0' && *p->uri != '?' && *p->uri != '#') {
355 33d32d1f 2020-12-25 op 		p->err = "illegal character in path";
356 33d32d1f 2020-12-25 op 		return 0;
357 33d32d1f 2020-12-25 op 	}
358 33d32d1f 2020-12-25 op 
359 33d32d1f 2020-12-25 op 	if (*p->uri != '\0') {
360 33d32d1f 2020-12-25 op 		c = *p->uri;
361 33d32d1f 2020-12-25 op 		*p->uri = '\0';
362 33d32d1f 2020-12-25 op 		p->uri++;
363 33d32d1f 2020-12-25 op 
364 33d32d1f 2020-12-25 op 		if (c == '#') {
365 33d32d1f 2020-12-25 op 			if (!parse_fragment(p))
366 33d32d1f 2020-12-25 op 				return 0;
367 33d32d1f 2020-12-25 op 		} else
368 33d32d1f 2020-12-25 op 			if (!parse_query(p) || !parse_fragment(p))
369 33d32d1f 2020-12-25 op 				return 0;
370 33d32d1f 2020-12-25 op 	}
371 33d32d1f 2020-12-25 op 
372 33d32d1f 2020-12-25 op 	if (!path_clean(p->parsed->path)) {
373 33d32d1f 2020-12-25 op 		p->err = "illegal path";
374 33d32d1f 2020-12-25 op 		return 0;
375 33d32d1f 2020-12-25 op 	}
376 33d32d1f 2020-12-25 op 
377 33d32d1f 2020-12-25 op 	return 1;
378 33d32d1f 2020-12-25 op }
379 33d32d1f 2020-12-25 op 
380 33d32d1f 2020-12-25 op int
381 33d32d1f 2020-12-25 op parse_uri(char *uri, struct uri *ret, const char **err_ret)
382 33d32d1f 2020-12-25 op {
383 33d32d1f 2020-12-25 op 	char *end;
384 33d32d1f 2020-12-25 op 	struct parser p = {uri, ret, NULL};
385 33d32d1f 2020-12-25 op 
386 33d32d1f 2020-12-25 op 	bzero(ret, sizeof(*ret));
387 33d32d1f 2020-12-25 op 
388 33d32d1f 2020-12-25 op 	/* initialize optional stuff to the empty string */
389 33d32d1f 2020-12-25 op 	end = uri + strlen(uri);
390 33d32d1f 2020-12-25 op 	p.parsed->port = end;
391 33d32d1f 2020-12-25 op 	p.parsed->path = end;
392 33d32d1f 2020-12-25 op 	p.parsed->query = end;
393 33d32d1f 2020-12-25 op 	p.parsed->fragment = end;
394 33d32d1f 2020-12-25 op 
395 33d32d1f 2020-12-25 op 	if (!parse_scheme(&p) || !parse_authority(&p) || !parse_path(&p)) {
396 33d32d1f 2020-12-25 op 		*err_ret = p.err;
397 33d32d1f 2020-12-25 op 		return 0;
398 33d32d1f 2020-12-25 op 	}
399 33d32d1f 2020-12-25 op 
400 33d32d1f 2020-12-25 op 	*err_ret = NULL;
401 33d32d1f 2020-12-25 op 	return 1;
402 33d32d1f 2020-12-25 op }
403 33d32d1f 2020-12-25 op 
404 33d32d1f 2020-12-25 op int
405 33d32d1f 2020-12-25 op trim_req_uri(char *uri)
406 33d32d1f 2020-12-25 op {
407 33d32d1f 2020-12-25 op 	char *i;
408 33d32d1f 2020-12-25 op 
409 33d32d1f 2020-12-25 op 	if ((i = strstr(uri, "\r\n")) == NULL)
410 33d32d1f 2020-12-25 op 		return 0;
411 33d32d1f 2020-12-25 op 	*i = '\0';
412 33d32d1f 2020-12-25 op 	return 1;
413 33d32d1f 2020-12-25 op }