[disorder] / lib / mime.c

/*
 * This file is part of DisOrder
 * Copyright (C) 2005, 2007 Richard Kettlewell
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */
/** @file lib/mime.c
 * @brief Support for MIME and allied protocols
 */

#include <config.h>
#include "types.h"

#include <string.h>
#include <ctype.h>

#include <stdio.h>

#include "mem.h"
#include "mime.h"
#include "vector.h"
#include "hex.h"
#include "log.h"
#include "base64.h"

/** @brief Match whitespace characters */
static int whitespace(int c) {
  switch(c) {
  case ' ':
  case '\t':
  case '\r':
  case '\n':
    return 1;
  default:
    return 0;
  }
}

/** @brief Match RFC2045 tspecial characters */
static int tspecial(int c) {
  switch(c) {
  case '(':
  case ')':
  case '<':
  case '>':
  case '@':
  case ',':
  case ';':
  case ':':
  case '\\':
  case '"':
  case '/':
  case '[':
  case ']':
  case '?':
  case '=':
    return 1;
  default:
    return 0;
  }
}

/** @brief Match RFC2616 seprator characters */
static int http_separator(int c) {
  switch(c) {
  case '(':
  case ')':
  case '<':
  case '>':
  case '@':
  case ',':
  case ';':
  case ':':
  case '\\':
  case '"':
  case '/':
  case '[':
  case ']':
  case '?':
  case '=':
  case '{':
  case '}':
  case ' ':
  case '\t':
    return 1;
  default:
    return 0;
  }
}

/** @brief Match CRLF */
static int iscrlf(const char *ptr) {
  return ptr[0] == '\r' && ptr[1] == '\n';
}

/** @brief Skip whitespace
 * @param rfc822_comments If true, skip RFC822 nested comments
 */
static const char *skipwhite(const char *s, int rfc822_comments) {
  int c, depth;
  
  for(;;) {
    switch(c = *s) {
    case ' ':
    case '\t':
    case '\r':
    case '\n':
      ++s;
      break;
    case '(':
      if(!rfc822_comments)
	return s;
      ++s;
      depth = 1;
      while(*s && depth) {
	c = *s++;
	switch(c) {
	case '(': ++depth; break;
	case ')': --depth; break;
	case '\\':
	  if(!*s) return 0;
	  ++s;
	  break;
	}
      }
      if(depth) return 0;
      break;
    default:
      return s;
    }
  }
}

/** @brief Test for a word character
 * @param c Character to test
 * @param special tspecial() (MIME/RFC2405) or http_separator() (HTTP/RFC2616)
 * @return 1 if @p c is a word character, else 0
 */
static int iswordchar(int c, int (*special)(int)) {
  return !(c <= ' ' || c > '~' || special(c));
}

/** @brief Parse an RFC1521/RFC2616 word
 * @param s Pointer to start of word
 * @param valuep Where to store value
 * @param special tspecial() (MIME/RFC2405) or http_separator() (HTTP/RFC2616)
 * @return Pointer just after end of word or NULL if there's no word
 *
 * A word is a token or a quoted-string.
 */
static const char *parseword(const char *s, char **valuep,
			     int (*special)(int)) {
  struct dynstr value[1];
  int c;

  dynstr_init(value);
  if(*s == '"') {
    ++s;
    while((c = *s++) != '"') {
      switch(c) {
      case '\\':
	if(!(c = *s++)) return 0;
      default:
	dynstr_append(value, c);
	break;
      }
    }
    if(!c) return 0;
  } else {
    if(!iswordchar((unsigned char)*s, special))
      return NULL;
    dynstr_init(value);
    while(iswordchar((unsigned char)*s, special))
      dynstr_append(value, *s++);
  }
  dynstr_terminate(value);
  *valuep = value->vec;
  return s;
}

/** @brief Parse an RFC1521/RFC2616 token
 * @param s Pointer to start of token
 * @param valuep Where to store value
 * @param special tspecial() (MIME/RFC2405) or http_separator() (HTTP/RFC2616)
 * @return Pointer just after end of token or NULL if there's no token
 */
static const char *parsetoken(const char *s, char **valuep,
			      int (*special)(int)) {
  if(*s == '"') return 0;
  return parseword(s, valuep, special);
}

/** @brief Parse a MIME content-type field
 * @param s Start of field
 * @param typep Where to store type
 * @param parameternamep Where to store parameter name
 * @param parameternvaluep Wher to store parameter value
 * @return 0 on success, non-0 on error
 */
int mime_content_type(const char *s,
		      char **typep,
		      char **parameternamep,
		      char **parametervaluep) {
  struct dynstr type, parametername;

  dynstr_init(&type);
  if(!(s = skipwhite(s, 1))) return -1;
  if(!*s) return -1;
  while(*s && !tspecial(*s) && !whitespace(*s))
    dynstr_append(&type, tolower((unsigned char)*s++));
  if(!(s = skipwhite(s, 1))) return -1;
  if(*s++ != '/') return -1;
  dynstr_append(&type, '/');
  if(!(s = skipwhite(s, 1))) return -1;
  while(*s && !tspecial(*s) && !whitespace(*s))
    dynstr_append(&type, tolower((unsigned char)*s++));
  if(!(s = skipwhite(s, 1))) return -1;

  if(*s == ';') {
    dynstr_init(&parametername);
    ++s;
    if(!(s = skipwhite(s, 1))) return -1;
    if(!*s) return -1;
    while(*s && !tspecial(*s) && !whitespace(*s))
      dynstr_append(&parametername, tolower((unsigned char)*s++));
    if(!(s = skipwhite(s, 1))) return -1;
    if(*s++ != '=') return -1;
    if(!(s = skipwhite(s, 1))) return -1;
    if(!(s = parseword(s, parametervaluep, tspecial))) return -1;
    if(!(s = skipwhite(s, 1))) return -1;
    dynstr_terminate(&parametername);
    *parameternamep = parametername.vec;
  } else
    *parametervaluep = *parameternamep = 0;
  dynstr_terminate(&type);
  *typep = type.vec;
  return 0;
}

/** @brief Parse a MIME message
 * @param s Start of message
 * @param callback Called for each header field
 * @param u Passed to callback
 * @return Pointer to decoded body (might be in original string)
 */
const char *mime_parse(const char *s,
		       int (*callback)(const char *name, const char *value,
				       void *u),
		       void *u) {
  struct dynstr name, value;
  char *cte = 0, *p;
  
  while(*s && !iscrlf(s)) {
    dynstr_init(&name);
    dynstr_init(&value);
    while(*s && !tspecial(*s) && !whitespace(*s))
      dynstr_append(&name, tolower((unsigned char)*s++));
    if(!(s = skipwhite(s, 1))) return 0;
    if(*s != ':') return 0;
    ++s;
    while(*s && !(*s == '\n' && !(s[1] == ' ' || s[1] == '\t')))
      dynstr_append(&value, *s++);
    if(*s) ++s;
    dynstr_terminate(&name);
    dynstr_terminate(&value);
    if(!strcmp(name.vec, "content-transfer-encoding")) {
      cte = xstrdup(value.vec);
      for(p = cte; *p; p++)
	*p = tolower((unsigned char)*p);
    }
    if(callback(name.vec, value.vec, u)) return 0;
  }
  if(*s) s += 2;
  if(cte) {
    if(!strcmp(cte, "base64")) return mime_base64(s, 0);
    if(!strcmp(cte, "quoted-printable")) return mime_qp(s);
  }
  return s;
}

static int isboundary(const char *ptr, const char *boundary, size_t bl) {
  return (ptr[0] == '-'
	  && ptr[1] == '-'
	  && !strncmp(ptr + 2, boundary, bl)
	  && (iscrlf(ptr + bl + 2)
	      || (ptr[bl + 2] == '-'
		  && ptr[bl + 3] == '-'
		  && (iscrlf(ptr + bl + 4) || *(ptr + bl + 4) == 0))));
}

static int isfinal(const char *ptr, const char *boundary, size_t bl) {
  return (ptr[0] == '-'
	  && ptr[1] == '-'
	  && !strncmp(ptr + 2, boundary, bl)
	  && ptr[bl + 2] == '-'
	  && ptr[bl + 3] == '-'
	  && (iscrlf(ptr + bl + 4) || *(ptr + bl + 4) == 0));
}

/** @brief Parse a multipart MIME body
 * @param s Start of message
 * @param callback CAllback for each part
 * @param boundary Boundary string
 * @param u Passed to callback
 * @return 0 on success, non-0 on error
 */
int mime_multipart(const char *s,
		   int (*callback)(const char *s, void *u),
		   const char *boundary,
		   void *u) {
  size_t bl = strlen(boundary);
  const char *start, *e;
  int ret;

  /* We must start with a boundary string */
  if(!isboundary(s, boundary, bl))
    return -1;
  /* Keep going until we hit a final boundary */
  while(!isfinal(s, boundary, bl)) {
    s = strstr(s, "\r\n") + 2;
    start = s;
    while(!isboundary(s, boundary, bl)) {
      if(!(e = strstr(s, "\r\n")))
	return -1;
      s = e + 2;
    }
    if((ret = callback(xstrndup(start,
				s == start ? 0 : s - start - 2),
		       u)))
      return ret;
  }
  return 0;
}

/** @brief Parse an RFC2388-style content-disposition field
 * @param s Start of field
 * @param typep Where to store type
 * @param parameternamep Where to store parameter name
 * @param parameternvaluep Wher to store parameter value
 * @return 0 on success, non-0 on error
 */
int mime_rfc2388_content_disposition(const char *s,
				     char **dispositionp,
				     char **parameternamep,
				     char **parametervaluep) {
  struct dynstr disposition, parametername;

  dynstr_init(&disposition);
  if(!(s = skipwhite(s, 1))) return -1;
  if(!*s) return -1;
  while(*s && !tspecial(*s) && !whitespace(*s))
    dynstr_append(&disposition, tolower((unsigned char)*s++));
  if(!(s = skipwhite(s, 1))) return -1;

  if(*s == ';') {
    dynstr_init(&parametername);
    ++s;
    if(!(s = skipwhite(s, 1))) return -1;
    if(!*s) return -1;
    while(*s && !tspecial(*s) && !whitespace(*s))
      dynstr_append(&parametername, tolower((unsigned char)*s++));
    if(!(s = skipwhite(s, 1))) return -1;
    if(*s++ != '=') return -1;
    if(!(s = skipwhite(s, 1))) return -1;
    if(!(s = parseword(s, parametervaluep, tspecial))) return -1;
    if(!(s = skipwhite(s, 1))) return -1;
    dynstr_terminate(&parametername);
    *parameternamep = parametername.vec;
  } else
    *parametervaluep = *parameternamep = 0;
  dynstr_terminate(&disposition);
  *dispositionp = disposition.vec;
  return 0;
}

/** @brief Convert MIME quoted-printable
 * @param s Quoted-printable data
 * @return Decoded data
 */
char *mime_qp(const char *s) {
  struct dynstr d;
  int c, a, b;
  const char *t;

  dynstr_init(&d);
  while((c = *s++)) {
    switch(c) {
    case '=':
      if((a = unhexdigitq(s[0])) != -1
	 && (b = unhexdigitq(s[1])) != -1) {
	dynstr_append(&d, a * 16 + b);
	s += 2;
      } else {
	t = s;
	while(*t == ' ' || *t == '\t') ++t;
	if(iscrlf(t)) {
	  /* soft line break */
	  s = t + 2;
	} else
	  return 0;
      }
      break;
    case ' ':
    case '\t':
      t = s;
      while(*t == ' ' || *t == '\t') ++t;
      if(iscrlf(t))
	/* trailing space is always eliminated */
	s = t;
      else
	dynstr_append(&d, c);
      break;
    default:
      dynstr_append(&d, c);
      break;
    }
  }
  dynstr_terminate(&d);
  return d.vec;
}

/** @brief Parse a RFC2109 Cookie: header
 * @param s Header field value
 * @param cd Where to store result
 * @return 0 on success, non-0 on error
 */
int parse_cookie(const char *s,
		 struct cookiedata *cd) {
  char *n = 0, *v = 0;

  memset(cd, 0, sizeof *cd);
  s = skipwhite(s, 0);
  while(*s) {
    /* Skip separators */
    if(*s == ';' || *s == ',') {
      ++s;
      s = skipwhite(s, 0);
      continue;
    }
    if(!(s = parsetoken(s, &n, http_separator))) return -1;
    s = skipwhite(s, 0);
    if(*s++ != '=') return -1;
    s = skipwhite(s, 0);
    if(!(s = parseword(s, &v, http_separator))) return -1;
    if(n[0] == '$') {
      /* Some bit of meta-information */
      if(!strcmp(n, "$Version"))
	cd->version = v;
      else if(!strcmp(n, "$Path")) {
	if(cd->ncookies > 0 && cd->cookies[cd->ncookies-1].path == 0)
	  cd->cookies[cd->ncookies-1].path = v;
	else {
	  error(0, "redundant $Path in Cookie: header");
	  return -1;
	}
      } else if(!strcmp(n, "$Domain")) {
	if(cd->ncookies > 0 && cd->cookies[cd->ncookies-1].domain == 0)
	  cd->cookies[cd->ncookies-1].domain = v;
	else {
	  error(0, "redundant $Domain in Cookie: header");
	  return -1;
	}
      }
    } else {
      /* It's a new cookie */
      cd->cookies = xrealloc(cd->cookies,
			     (cd->ncookies + 1) * sizeof (struct cookie));
      cd->cookies[cd->ncookies].name = n;
      cd->cookies[cd->ncookies].value = v;
      cd->cookies[cd->ncookies].path = 0;
      cd->cookies[cd->ncookies].domain = 0;
      ++cd->ncookies;
    }
    s = skipwhite(s, 0);
    if(*s && (*s != ',' && *s != ';')) {
      error(0, "missing separator in Cookie: header");
      return -1;
    }
  }
  return 0;
}

/** @brief Find a named cookie
 * @param cd Parse cookie data
 * @param name Name of cookie
 * @return Cookie structure or NULL if not found
 */
const struct cookie *find_cookie(const struct cookiedata *cd,
				 const char *name) {
  int n;

  for(n = 0; n < cd->ncookies; ++n)
    if(!strcmp(cd->cookies[n].name, name))
      return &cd->cookies[n];
  return 0;
}

/*
Local Variables:
c-basic-offset:2
comment-column:40
fill-column:79
End:
*/
Commit	Line	Data
460b9539	1	/*
460b9539	2	* This file is part of DisOrder
39d4aa6b	3	* Copyright (C) 2005, 2007 Richard Kettlewell
460b9539	4	*
	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.
	9	*
	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.
	14	*
	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
	18	* USA
	19	*/
39d4aa6b RK	20	/** @file lib/mime.c
	21	* @brief Support for MIME and allied protocols
	22	*/
460b9539	23
	24	#include <config.h>
	25	#include "types.h"
	26
	27	#include <string.h>
	28	#include <ctype.h>
	29
22896b25 RK	30	#include <stdio.h>
22896b25 RK	31
460b9539	32	#include "mem.h"
	33	#include "mime.h"
	34	#include "vector.h"
	35	#include "hex.h"
39d4aa6b	36	#include "log.h"
fce810c2	37	#include "base64.h"
460b9539	38
39d4aa6b	39	/** @brief Match whitespace characters */
460b9539	40	static int whitespace(int c) {
	41	switch(c) {
	42	case ' ':
	43	case '\t':
	44	case '\r':
	45	case '\n':
	46	return 1;
	47	default:
	48	return 0;
	49	}
	50	}
	51
39d4aa6b	52	/** @brief Match RFC2045 tspecial characters */
460b9539	53	static int tspecial(int c) {
	54	switch(c) {
	55	case '(':
	56	case ')':
	57	case '<':
	58	case '>':
	59	case '@':
	60	case ',':
	61	case ';':
	62	case ':':
	63	case '\\':
	64	case '"':
	65	case '/':
	66	case '[':
	67	case ']':
	68	case '?':
	69	case '=':
	70	return 1;
	71	default:
	72	return 0;
	73	}
	74	}
	75
5818980a	76	/** @brief Match RFC2616 seprator characters */
39d4aa6b RK	77	static int http_separator(int c) {
	78	switch(c) {
	79	case '(':
	80	case ')':
	81	case '<':
	82	case '>':
	83	case '@':
	84	case ',':
	85	case ';':
	86	case ':':
	87	case '\\':
	88	case '"':
	89	case '/':
	90	case '[':
	91	case ']':
	92	case '?':
	93	case '=':
	94	case '{':
	95	case '}':
	96	case ' ':
	97	case '\t':
	98	return 1;
	99	default:
	100	return 0;
	101	}
	102	}
	103
	104	/** @brief Match CRLF */
	105	static int iscrlf(const char *ptr) {
	106	return ptr[0] == '\r' && ptr[1] == '\n';
	107	}
	108
	109	/** @brief Skip whitespace
	110	* @param rfc822_comments If true, skip RFC822 nested comments
	111	*/
	112	static const char skipwhite(const char s, int rfc822_comments) {
460b9539	113	int c, depth;
	114
	115	for(;;) {
	116	switch(c = *s) {
	117	case ' ':
	118	case '\t':
	119	case '\r':
	120	case '\n':
	121	++s;
	122	break;
	123	case '(':
39d4aa6b RK	124	if(!rfc822_comments)
39d4aa6b RK	125	return s;
460b9539	126	++s;
	127	depth = 1;
	128	while(*s && depth) {
	129	c = *s++;
	130	switch(c) {
	131	case '(': ++depth; break;
	132	case ')': --depth; break;
	133	case '\\':
	134	if(!*s) return 0;
	135	++s;
	136	break;
	137	}
	138	}
	139	if(depth) return 0;
	140	break;
	141	default:
	142	return s;
	143	}
	144	}
	145	}
	146
39d4aa6b RK	147	/** @brief Test for a word character
	148	* @param c Character to test
	149	* @param special tspecial() (MIME/RFC2405) or http_separator() (HTTP/RFC2616)
	150	* @return 1 if @p c is a word character, else 0
	151	*/
	152	static int iswordchar(int c, int (*special)(int)) {
	153	return !(c <= ' ' \|\| c > '~' \|\| special(c));
	154	}
	155
	156	/** @brief Parse an RFC1521/RFC2616 word
	157	* @param s Pointer to start of word
	158	* @param valuep Where to store value
	159	* @param special tspecial() (MIME/RFC2405) or http_separator() (HTTP/RFC2616)
	160	* @return Pointer just after end of word or NULL if there's no word
	161	*
	162	* A word is a token or a quoted-string.
	163	*/
	164	static const char parseword(const char s, char **valuep,
	165	int (*special)(int)) {
	166	struct dynstr value[1];
460b9539	167	int c;
460b9539	168
39d4aa6b RK	169	dynstr_init(value);
	170	if(*s == '"') {
	171	++s;
	172	while((c = *s++) != '"') {
	173	switch(c) {
	174	case '\\':
	175	if(!(c = *s++)) return 0;
	176	default:
	177	dynstr_append(value, c);
	178	break;
	179	}
460b9539	180	}
39d4aa6b RK	181	if(!c) return 0;
	182	} else {
	183	if(!iswordchar((unsigned char)*s, special))
	184	return NULL;
	185	dynstr_init(value);
	186	while(iswordchar((unsigned char)*s, special))
	187	dynstr_append(value, *s++);
460b9539	188	}
39d4aa6b RK	189	dynstr_terminate(value);
39d4aa6b RK	190	*valuep = value->vec;
460b9539	191	return s;
	192	}
	193
39d4aa6b RK	194	/** @brief Parse an RFC1521/RFC2616 token
	195	* @param s Pointer to start of token
	196	* @param valuep Where to store value
	197	* @param special tspecial() (MIME/RFC2405) or http_separator() (HTTP/RFC2616)
	198	* @return Pointer just after end of token or NULL if there's no token
	199	*/
	200	static const char parsetoken(const char s, char **valuep,
	201	int (*special)(int)) {
	202	if(*s == '"') return 0;
	203	return parseword(s, valuep, special);
	204	}
	205
	206	/** @brief Parse a MIME content-type field
	207	* @param s Start of field
	208	* @param typep Where to store type
	209	* @param parameternamep Where to store parameter name
	210	* @param parameternvaluep Wher to store parameter value
	211	* @return 0 on success, non-0 on error
	212	*/
460b9539	213	int mime_content_type(const char *s,
	214	char **typep,
	215	char **parameternamep,
	216	char **parametervaluep) {
39d4aa6b	217	struct dynstr type, parametername;
460b9539	218
460b9539	219	dynstr_init(&type);
39d4aa6b	220	if(!(s = skipwhite(s, 1))) return -1;
460b9539	221	if(!*s) return -1;
	222	while(s && !tspecial(s) && !whitespace(*s))
	223	dynstr_append(&type, tolower((unsigned char)*s++));
39d4aa6b	224	if(!(s = skipwhite(s, 1))) return -1;
460b9539	225	if(*s++ != '/') return -1;
460b9539	226	dynstr_append(&type, '/');
39d4aa6b	227	if(!(s = skipwhite(s, 1))) return -1;
460b9539	228	while(s && !tspecial(s) && !whitespace(*s))
460b9539	229	dynstr_append(&type, tolower((unsigned char)*s++));
39d4aa6b	230	if(!(s = skipwhite(s, 1))) return -1;
460b9539	231
	232	if(*s == ';') {
	233	dynstr_init(&parametername);
	234	++s;
39d4aa6b	235	if(!(s = skipwhite(s, 1))) return -1;
460b9539	236	if(!*s) return -1;
	237	while(s && !tspecial(s) && !whitespace(*s))
	238	dynstr_append(&parametername, tolower((unsigned char)*s++));
39d4aa6b	239	if(!(s = skipwhite(s, 1))) return -1;
460b9539	240	if(*s++ != '=') return -1;
39d4aa6b RK	241	if(!(s = skipwhite(s, 1))) return -1;
	242	if(!(s = parseword(s, parametervaluep, tspecial))) return -1;
	243	if(!(s = skipwhite(s, 1))) return -1;
460b9539	244	dynstr_terminate(&parametername);
	245	*parameternamep = parametername.vec;
	246	} else
	247	parametervaluep = parameternamep = 0;
	248	dynstr_terminate(&type);
	249	*typep = type.vec;
	250	return 0;
	251	}
	252
39d4aa6b RK	253	/** @brief Parse a MIME message
	254	* @param s Start of message
	255	* @param callback Called for each header field
	256	* @param u Passed to callback
	257	* @return Pointer to decoded body (might be in original string)
	258	*/
460b9539	259	const char mime_parse(const char s,
	260	int (callback)(const char name, const char *value,
	261	void *u),
	262	void *u) {
	263	struct dynstr name, value;
	264	char cte = 0, p;
	265
	266	while(*s && !iscrlf(s)) {
	267	dynstr_init(&name);
	268	dynstr_init(&value);
	269	while(s && !tspecial(s) && !whitespace(*s))
	270	dynstr_append(&name, tolower((unsigned char)*s++));
39d4aa6b	271	if(!(s = skipwhite(s, 1))) return 0;
460b9539	272	if(*s != ':') return 0;
	273	++s;
	274	while(s && !(s == '\n' && !(s[1] == ' ' \|\| s[1] == '\t')))
	275	dynstr_append(&value, *s++);
	276	if(*s) ++s;
	277	dynstr_terminate(&name);
	278	dynstr_terminate(&value);
	279	if(!strcmp(name.vec, "content-transfer-encoding")) {
	280	cte = xstrdup(value.vec);
	281	for(p = cte; *p; p++)
	282	p = tolower((unsigned char)p);
	283	}
	284	if(callback(name.vec, value.vec, u)) return 0;
	285	}
	286	if(*s) s += 2;
	287	if(cte) {
8a7ccdfe	288	if(!strcmp(cte, "base64")) return mime_base64(s, 0);
460b9539	289	if(!strcmp(cte, "quoted-printable")) return mime_qp(s);
	290	}
	291	return s;
	292	}
	293
	294	static int isboundary(const char ptr, const char boundary, size_t bl) {
	295	return (ptr[0] == '-'
	296	&& ptr[1] == '-'
	297	&& !strncmp(ptr + 2, boundary, bl)
	298	&& (iscrlf(ptr + bl + 2)
	299	\|\| (ptr[bl + 2] == '-'
	300	&& ptr[bl + 3] == '-'
22896b25	301	&& (iscrlf(ptr + bl + 4) \|\| *(ptr + bl + 4) == 0))));
460b9539	302	}
	303
	304	static int isfinal(const char ptr, const char boundary, size_t bl) {
	305	return (ptr[0] == '-'
	306	&& ptr[1] == '-'
	307	&& !strncmp(ptr + 2, boundary, bl)
	308	&& ptr[bl + 2] == '-'
	309	&& ptr[bl + 3] == '-'
22896b25	310	&& (iscrlf(ptr + bl + 4) \|\| *(ptr + bl + 4) == 0));
460b9539	311	}
460b9539	312
39d4aa6b RK	313	/** @brief Parse a multipart MIME body
	314	* @param s Start of message
	315	* @param callback CAllback for each part
	316	* @param boundary Boundary string
	317	* @param u Passed to callback
	318	* @return 0 on success, non-0 on error
	319	*/
460b9539	320	int mime_multipart(const char *s,
	321	int (callback)(const char s, void *u),
	322	const char *boundary,
	323	void *u) {
	324	size_t bl = strlen(boundary);
	325	const char start, e;
	326	int ret;
	327
22896b25 RK	328	/* We must start with a boundary string */
	329	if(!isboundary(s, boundary, bl))
	330	return -1;
	331	/* Keep going until we hit a final boundary */
460b9539	332	while(!isfinal(s, boundary, bl)) {
	333	s = strstr(s, "\r\n") + 2;
	334	start = s;
	335	while(!isboundary(s, boundary, bl)) {
22896b25 RK	336	if(!(e = strstr(s, "\r\n")))
22896b25 RK	337	return -1;
460b9539	338	s = e + 2;
	339	}
	340	if((ret = callback(xstrndup(start,
	341	s == start ? 0 : s - start - 2),
	342	u)))
	343	return ret;
	344	}
	345	return 0;
	346	}
	347
39d4aa6b RK	348	/** @brief Parse an RFC2388-style content-disposition field
	349	* @param s Start of field
	350	* @param typep Where to store type
	351	* @param parameternamep Where to store parameter name
	352	* @param parameternvaluep Wher to store parameter value
	353	* @return 0 on success, non-0 on error
	354	*/
460b9539	355	int mime_rfc2388_content_disposition(const char *s,
	356	char **dispositionp,
	357	char **parameternamep,
	358	char **parametervaluep) {
39d4aa6b	359	struct dynstr disposition, parametername;
460b9539	360
460b9539	361	dynstr_init(&disposition);
39d4aa6b	362	if(!(s = skipwhite(s, 1))) return -1;
460b9539	363	if(!*s) return -1;
	364	while(s && !tspecial(s) && !whitespace(*s))
	365	dynstr_append(&disposition, tolower((unsigned char)*s++));
39d4aa6b	366	if(!(s = skipwhite(s, 1))) return -1;
460b9539	367
	368	if(*s == ';') {
	369	dynstr_init(&parametername);
	370	++s;
39d4aa6b	371	if(!(s = skipwhite(s, 1))) return -1;
460b9539	372	if(!*s) return -1;
	373	while(s && !tspecial(s) && !whitespace(*s))
	374	dynstr_append(&parametername, tolower((unsigned char)*s++));
39d4aa6b	375	if(!(s = skipwhite(s, 1))) return -1;
460b9539	376	if(*s++ != '=') return -1;
39d4aa6b RK	377	if(!(s = skipwhite(s, 1))) return -1;
	378	if(!(s = parseword(s, parametervaluep, tspecial))) return -1;
	379	if(!(s = skipwhite(s, 1))) return -1;
460b9539	380	dynstr_terminate(&parametername);
	381	*parameternamep = parametername.vec;
	382	} else
	383	parametervaluep = parameternamep = 0;
	384	dynstr_terminate(&disposition);
	385	*dispositionp = disposition.vec;
	386	return 0;
	387	}
	388
39d4aa6b RK	389	/** @brief Convert MIME quoted-printable
	390	* @param s Quoted-printable data
	391	* @return Decoded data
	392	*/
460b9539	393	char mime_qp(const char s) {
	394	struct dynstr d;
	395	int c, a, b;
	396	const char *t;
	397
	398	dynstr_init(&d);
	399	while((c = *s++)) {
	400	switch(c) {
	401	case '=':
	402	if((a = unhexdigitq(s[0])) != -1
	403	&& (b = unhexdigitq(s[1])) != -1) {
	404	dynstr_append(&d, a * 16 + b);
	405	s += 2;
	406	} else {
	407	t = s;
	408	while(t == ' ' \|\| t == '\t') ++t;
	409	if(iscrlf(t)) {
	410	/* soft line break */
	411	s = t + 2;
	412	} else
	413	return 0;
	414	}
	415	break;
	416	case ' ':
	417	case '\t':
	418	t = s;
	419	while(t == ' ' \|\| t == '\t') ++t;
	420	if(iscrlf(t))
	421	/* trailing space is always eliminated */
	422	s = t;
	423	else
	424	dynstr_append(&d, c);
	425	break;
	426	default:
	427	dynstr_append(&d, c);
	428	break;
	429	}
	430	}
	431	dynstr_terminate(&d);
	432	return d.vec;
	433	}
	434
39d4aa6b RK	435	/** @brief Parse a RFC2109 Cookie: header
	436	* @param s Header field value
	437	* @param cd Where to store result
	438	* @return 0 on success, non-0 on error
	439	*/
	440	int parse_cookie(const char *s,
	441	struct cookiedata *cd) {
	442	char n = 0, v = 0;
	443
	444	memset(cd, 0, sizeof *cd);
	445	s = skipwhite(s, 0);
	446	while(*s) {
	447	/* Skip separators */
	448	if(s == ';' \|\| s == ',') {
	449	++s;
	450	s = skipwhite(s, 0);
	451	continue;
	452	}
	453	if(!(s = parsetoken(s, &n, http_separator))) return -1;
	454	s = skipwhite(s, 0);
	455	if(*s++ != '=') return -1;
	456	s = skipwhite(s, 0);
	457	if(!(s = parseword(s, &v, http_separator))) return -1;
	458	if(n[0] == '$') {
	459	/* Some bit of meta-information */
	460	if(!strcmp(n, "$Version"))
	461	cd->version = v;
	462	else if(!strcmp(n, "$Path")) {
	463	if(cd->ncookies > 0 && cd->cookies[cd->ncookies-1].path == 0)
	464	cd->cookies[cd->ncookies-1].path = v;
	465	else {
	466	error(0, "redundant $Path in Cookie: header");
	467	return -1;
	468	}
	469	} else if(!strcmp(n, "$Domain")) {
	470	if(cd->ncookies > 0 && cd->cookies[cd->ncookies-1].domain == 0)
	471	cd->cookies[cd->ncookies-1].domain = v;
	472	else {
	473	error(0, "redundant $Domain in Cookie: header");
	474	return -1;
	475	}
	476	}
	477	} else {
	478	/* It's a new cookie */
	479	cd->cookies = xrealloc(cd->cookies,
	480	(cd->ncookies + 1) * sizeof (struct cookie));
	481	cd->cookies[cd->ncookies].name = n;
	482	cd->cookies[cd->ncookies].value = v;
	483	cd->cookies[cd->ncookies].path = 0;
	484	cd->cookies[cd->ncookies].domain = 0;
	485	++cd->ncookies;
	486	}
	487	s = skipwhite(s, 0);
	488	if(s && (s != ',' && *s != ';')) {
	489	error(0, "missing separator in Cookie: header");
	490	return -1;
	491	}
	492	}
	493	return 0;
	494	}
	495
	496	/** @brief Find a named cookie
	497	* @param cd Parse cookie data
	498	* @param name Name of cookie
499	* @return Cookie structure or NULL if not found
500	*/
501	const struct cookie find_cookie(const struct cookiedata cd,
502	const char *name) {
503	int n;
504
505	for(n = 0; n < cd->ncookies; ++n)
506	if(!strcmp(cd->cookies[n].name, name))
507	return &cd->cookies[n];
508	return 0;
509	}
510
460b9539	511	/*
	512	Local Variables:
	513	c-basic-offset:2
	514	comment-column:40
	515	fill-column:79
	516	End:
	517	*/