2 * This file is part of DisOrder
3 * Copyright (C) 2005, 2007 Richard Kettlewell
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * @brief Support for MIME and allied protocols
36 /** @brief Match whitespace characters */
37 static int whitespace(int c) {
49 /** @brief Match RFC2045 tspecial characters */
50 static int tspecial(int c) {
73 /** @brief Mathc RFC2616 seprator characters */
74 static int http_separator(int c) {
101 /** @brief Match CRLF */
102 static int iscrlf(const char *ptr) {
103 return ptr[0] == '\r' && ptr[1] == '\n';
106 /** @brief Skip whitespace
107 * @param rfc822_comments If true, skip RFC822 nested comments
109 static const char *skipwhite(const char *s, int rfc822_comments) {
128 case '(': ++depth; break;
129 case ')': --depth; break;
144 /** @brief Test for a word character
145 * @param c Character to test
146 * @param special tspecial() (MIME/RFC2405) or http_separator() (HTTP/RFC2616)
147 * @return 1 if @p c is a word character, else 0
149 static int iswordchar(int c, int (*special)(int)) {
150 return !(c <= ' ' || c > '~' || special(c));
153 /** @brief Parse an RFC1521/RFC2616 word
154 * @param s Pointer to start of word
155 * @param valuep Where to store value
156 * @param special tspecial() (MIME/RFC2405) or http_separator() (HTTP/RFC2616)
157 * @return Pointer just after end of word or NULL if there's no word
159 * A word is a token or a quoted-string.
161 static const char *parseword(const char *s, char **valuep,
162 int (*special)(int)) {
163 struct dynstr value[1];
169 while((c = *s++) != '"') {
172 if(!(c = *s++)) return 0;
174 dynstr_append(value, c);
180 if(!iswordchar((unsigned char)*s, special))
183 while(iswordchar((unsigned char)*s, special))
184 dynstr_append(value, *s++);
186 dynstr_terminate(value);
187 *valuep = value->vec;
191 /** @brief Parse an RFC1521/RFC2616 token
192 * @param s Pointer to start of token
193 * @param valuep Where to store value
194 * @param special tspecial() (MIME/RFC2405) or http_separator() (HTTP/RFC2616)
195 * @return Pointer just after end of token or NULL if there's no token
197 static const char *parsetoken(const char *s, char **valuep,
198 int (*special)(int)) {
199 if(*s == '"') return 0;
200 return parseword(s, valuep, special);
203 /** @brief Parse a MIME content-type field
204 * @param s Start of field
205 * @param typep Where to store type
206 * @param parameternamep Where to store parameter name
207 * @param parameternvaluep Wher to store parameter value
208 * @return 0 on success, non-0 on error
210 int mime_content_type(const char *s,
212 char **parameternamep,
213 char **parametervaluep) {
214 struct dynstr type, parametername;
217 if(!(s = skipwhite(s, 1))) return -1;
219 while(*s && !tspecial(*s) && !whitespace(*s))
220 dynstr_append(&type, tolower((unsigned char)*s++));
221 if(!(s = skipwhite(s, 1))) return -1;
222 if(*s++ != '/') return -1;
223 dynstr_append(&type, '/');
224 if(!(s = skipwhite(s, 1))) return -1;
225 while(*s && !tspecial(*s) && !whitespace(*s))
226 dynstr_append(&type, tolower((unsigned char)*s++));
227 if(!(s = skipwhite(s, 1))) return -1;
230 dynstr_init(¶metername);
232 if(!(s = skipwhite(s, 1))) return -1;
234 while(*s && !tspecial(*s) && !whitespace(*s))
235 dynstr_append(¶metername, tolower((unsigned char)*s++));
236 if(!(s = skipwhite(s, 1))) return -1;
237 if(*s++ != '=') return -1;
238 if(!(s = skipwhite(s, 1))) return -1;
239 if(!(s = parseword(s, parametervaluep, tspecial))) return -1;
240 if(!(s = skipwhite(s, 1))) return -1;
241 dynstr_terminate(¶metername);
242 *parameternamep = parametername.vec;
244 *parametervaluep = *parameternamep = 0;
245 dynstr_terminate(&type);
250 /** @brief Parse a MIME message
251 * @param s Start of message
252 * @param callback Called for each header field
253 * @param u Passed to callback
254 * @return Pointer to decoded body (might be in original string)
256 const char *mime_parse(const char *s,
257 int (*callback)(const char *name, const char *value,
260 struct dynstr name, value;
263 while(*s && !iscrlf(s)) {
266 while(*s && !tspecial(*s) && !whitespace(*s))
267 dynstr_append(&name, tolower((unsigned char)*s++));
268 if(!(s = skipwhite(s, 1))) return 0;
269 if(*s != ':') return 0;
271 while(*s && !(*s == '\n' && !(s[1] == ' ' || s[1] == '\t')))
272 dynstr_append(&value, *s++);
274 dynstr_terminate(&name);
275 dynstr_terminate(&value);
276 if(!strcmp(name.vec, "content-transfer-encoding")) {
277 cte = xstrdup(value.vec);
278 for(p = cte; *p; p++)
279 *p = tolower((unsigned char)*p);
281 if(callback(name.vec, value.vec, u)) return 0;
285 if(!strcmp(cte, "base64")) return mime_base64(s);
286 if(!strcmp(cte, "quoted-printable")) return mime_qp(s);
291 static int isboundary(const char *ptr, const char *boundary, size_t bl) {
292 return (ptr[0] == '-'
294 && !strncmp(ptr + 2, boundary, bl)
295 && (iscrlf(ptr + bl + 2)
296 || (ptr[bl + 2] == '-'
297 && ptr[bl + 3] == '-'
298 && iscrlf(ptr + bl + 4))));
301 static int isfinal(const char *ptr, const char *boundary, size_t bl) {
302 return (ptr[0] == '-'
304 && !strncmp(ptr + 2, boundary, bl)
305 && ptr[bl + 2] == '-'
306 && ptr[bl + 3] == '-'
307 && iscrlf(ptr + bl + 4));
310 /** @brief Parse a multipart MIME body
311 * @param s Start of message
312 * @param callback CAllback for each part
313 * @param boundary Boundary string
314 * @param u Passed to callback
315 * @return 0 on success, non-0 on error
317 int mime_multipart(const char *s,
318 int (*callback)(const char *s, void *u),
319 const char *boundary,
321 size_t bl = strlen(boundary);
322 const char *start, *e;
325 if(!isboundary(s, boundary, bl)) return -1;
326 while(!isfinal(s, boundary, bl)) {
327 s = strstr(s, "\r\n") + 2;
329 while(!isboundary(s, boundary, bl)) {
330 if(!(e = strstr(s, "\r\n"))) return -1;
333 if((ret = callback(xstrndup(start,
334 s == start ? 0 : s - start - 2),
341 /** @brief Parse an RFC2388-style content-disposition field
342 * @param s Start of field
343 * @param typep Where to store type
344 * @param parameternamep Where to store parameter name
345 * @param parameternvaluep Wher to store parameter value
346 * @return 0 on success, non-0 on error
348 int mime_rfc2388_content_disposition(const char *s,
350 char **parameternamep,
351 char **parametervaluep) {
352 struct dynstr disposition, parametername;
354 dynstr_init(&disposition);
355 if(!(s = skipwhite(s, 1))) return -1;
357 while(*s && !tspecial(*s) && !whitespace(*s))
358 dynstr_append(&disposition, tolower((unsigned char)*s++));
359 if(!(s = skipwhite(s, 1))) return -1;
362 dynstr_init(¶metername);
364 if(!(s = skipwhite(s, 1))) return -1;
366 while(*s && !tspecial(*s) && !whitespace(*s))
367 dynstr_append(¶metername, tolower((unsigned char)*s++));
368 if(!(s = skipwhite(s, 1))) return -1;
369 if(*s++ != '=') return -1;
370 if(!(s = skipwhite(s, 1))) return -1;
371 if(!(s = parseword(s, parametervaluep, tspecial))) return -1;
372 if(!(s = skipwhite(s, 1))) return -1;
373 dynstr_terminate(¶metername);
374 *parameternamep = parametername.vec;
376 *parametervaluep = *parameternamep = 0;
377 dynstr_terminate(&disposition);
378 *dispositionp = disposition.vec;
382 /** @brief Convert MIME quoted-printable
383 * @param s Quoted-printable data
384 * @return Decoded data
386 char *mime_qp(const char *s) {
395 if((a = unhexdigitq(s[0])) != -1
396 && (b = unhexdigitq(s[1])) != -1) {
397 dynstr_append(&d, a * 16 + b);
401 while(*t == ' ' || *t == '\t') ++t;
403 /* soft line break */
412 while(*t == ' ' || *t == '\t') ++t;
414 /* trailing space is always eliminated */
417 dynstr_append(&d, c);
420 dynstr_append(&d, c);
424 dynstr_terminate(&d);
428 /** @brief Convert MIME base64
429 * @param s base64 data
430 * @return Decoded data
432 char *mime_base64(const char *s) {
436 static const char table[] =
437 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
441 while((c = (unsigned char)*s++)) {
442 if((t = strchr(table, c))) {
445 dynstr_append(&d, (b[0] << 2) + (b[1] >> 4));
446 dynstr_append(&d, (b[1] << 4) + (b[2] >> 2));
447 dynstr_append(&d, (b[2] << 6) + b[3]);
450 } else if(c == '=') {
452 dynstr_append(&d, (b[0] << 2) + (b[1] >> 4));
454 dynstr_append(&d, (b[1] << 4) + (b[2] >> 2));
459 dynstr_terminate(&d);
463 /** @brief Parse a RFC2109 Cookie: header
464 * @param s Header field value
465 * @param cd Where to store result
466 * @return 0 on success, non-0 on error
468 int parse_cookie(const char *s,
469 struct cookiedata *cd) {
472 memset(cd, 0, sizeof *cd);
475 /* Skip separators */
476 if(*s == ';' || *s == ',') {
481 if(!(s = parsetoken(s, &n, http_separator))) return -1;
483 if(*s++ != '=') return -1;
485 if(!(s = parseword(s, &v, http_separator))) return -1;
487 /* Some bit of meta-information */
488 if(!strcmp(n, "$Version"))
490 else if(!strcmp(n, "$Path")) {
491 if(cd->ncookies > 0 && cd->cookies[cd->ncookies-1].path == 0)
492 cd->cookies[cd->ncookies-1].path = v;
494 error(0, "redundant $Path in Cookie: header");
497 } else if(!strcmp(n, "$Domain")) {
498 if(cd->ncookies > 0 && cd->cookies[cd->ncookies-1].domain == 0)
499 cd->cookies[cd->ncookies-1].domain = v;
501 error(0, "redundant $Domain in Cookie: header");
506 /* It's a new cookie */
507 cd->cookies = xrealloc(cd->cookies,
508 (cd->ncookies + 1) * sizeof (struct cookie));
509 cd->cookies[cd->ncookies].name = n;
510 cd->cookies[cd->ncookies].value = v;
511 cd->cookies[cd->ncookies].path = 0;
512 cd->cookies[cd->ncookies].domain = 0;
516 if(*s && (*s != ',' && *s != ';')) {
517 error(0, "missing separator in Cookie: header");
524 /** @brief Find a named cookie
525 * @param cd Parse cookie data
526 * @param name Name of cookie
527 * @return Cookie structure or NULL if not found
529 const struct cookie *find_cookie(const struct cookiedata *cd,
533 for(n = 0; n < cd->ncookies; ++n)
534 if(!strcmp(cd->cookies[n].name, name))
535 return &cd->cookies[n];