/*
* This file is part of DisOrder
- * Copyright (C) 2005 Richard Kettlewell
+ * 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
* 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 ' ':
}
}
+/** @brief Match RFC2045 tspecial characters */
static int tspecial(int c) {
switch(c) {
case '(':
}
}
-static const char *skipwhite(const char *s) {
+/** @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 s Pointer into string
+ * @param rfc822_comments If true, skip RFC822 nested comments
+ * @return Pointer into string after whitespace
+ */
+static const char *skipwhite(const char *s, int rfc822_comments) {
int c, depth;
for(;;) {
++s;
break;
case '(':
+ if(!rfc822_comments)
+ return s;
++s;
depth = 1;
while(*s && depth) {
}
}
-static const char *parsestring(const char *s, char **valuep) {
- struct dynstr value;
+/** @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);
- ++s;
- while((c = *s++) != '"') {
- switch(c) {
- case '\\':
- if(!(c = *s++)) return 0;
- default:
- dynstr_append(&value, c);
- break;
+ 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++);
}
- if(!c) return 0;
- dynstr_terminate(&value);
- *valuep = value.vec;
+ 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 parametervaluep Wher to store parameter value
+ * @return 0 on success, non-0 on error
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2045#section-5">RFC 2045 s5</a>.
+ */
int mime_content_type(const char *s,
char **typep,
char **parameternamep,
char **parametervaluep) {
- struct dynstr type, parametername, parametervalue;
+ struct dynstr type, parametername;
dynstr_init(&type);
- if(!(s = skipwhite(s))) return -1;
+ 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))) return -1;
+ if(!(s = skipwhite(s, 1))) return -1;
if(*s++ != '/') return -1;
dynstr_append(&type, '/');
- if(!(s = skipwhite(s))) return -1;
+ if(!(s = skipwhite(s, 1))) return -1;
while(*s && !tspecial(*s) && !whitespace(*s))
dynstr_append(&type, tolower((unsigned char)*s++));
- if(!(s = skipwhite(s))) return -1;
+ if(!(s = skipwhite(s, 1))) return -1;
if(*s == ';') {
dynstr_init(¶metername);
++s;
- if(!(s = skipwhite(s))) return -1;
+ if(!(s = skipwhite(s, 1))) return -1;
if(!*s) return -1;
while(*s && !tspecial(*s) && !whitespace(*s))
dynstr_append(¶metername, tolower((unsigned char)*s++));
- if(!(s = skipwhite(s))) return -1;
+ if(!(s = skipwhite(s, 1))) return -1;
if(*s++ != '=') return -1;
- if(!(s = skipwhite(s))) return -1;
- if(*s == '"') {
- if(!(s = parsestring(s, parametervaluep))) return -1;
- } else {
- dynstr_init(¶metervalue);
- while(*s && !tspecial(*s) && !whitespace(*s))
- dynstr_append(¶metervalue, *s++);
- dynstr_terminate(¶metervalue);
- *parametervaluep = parametervalue.vec;
- }
- if(!(s = skipwhite(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(¶metername);
*parameternamep = parametername.vec;
} else
return 0;
}
-static int iscrlf(const char *ptr) {
- return ptr[0] == '\r' && ptr[1] == '\n';
-}
-
+/** @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), or NULL on error
+ *
+ * This does an RFC 822-style parse and honors Content-Transfer-Encoding as
+ * described in <a href="http://tools.ietf.org/html/rfc2045#section-6">RFC 2045
+ * s6</a>. @p callback is called for each header field encountered, in order,
+ * with ASCII characters in the header name forced to lower case.
+ */
const char *mime_parse(const char *s,
int (*callback)(const char *name, const char *value,
void *u),
dynstr_init(&value);
while(*s && !tspecial(*s) && !whitespace(*s))
dynstr_append(&name, tolower((unsigned char)*s++));
- if(!(s = skipwhite(s))) return 0;
+ if(!(s = skipwhite(s, 1))) return 0;
if(*s != ':') return 0;
++s;
while(*s && !(*s == '\n' && !(s[1] == ' ' || s[1] == '\t')))
}
if(*s) s += 2;
if(cte) {
- if(!strcmp(cte, "base64")) return mime_base64(s);
+ if(!strcmp(cte, "base64")) return mime_base64(s, 0);
if(!strcmp(cte, "quoted-printable")) return mime_qp(s);
}
return s;
}
+/** @brief Match the boundary string */
static int isboundary(const char *ptr, const char *boundary, size_t bl) {
return (ptr[0] == '-'
&& ptr[1] == '-'
&& (iscrlf(ptr + bl + 2)
|| (ptr[bl + 2] == '-'
&& ptr[bl + 3] == '-'
- && iscrlf(ptr + bl + 4))));
+ && (iscrlf(ptr + bl + 4) || *(ptr + bl + 4) == 0))));
}
+/** @brief Match the final boundary string */
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));
+ && (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
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2046#section-5.1">RFC 2046
+ * s5.1</a>. @p callback is called for each part (not yet decoded in any way)
+ * in succession; you should probably call mime_parse() for each part.
+ */
int mime_multipart(const char *s,
int (*callback)(const char *s, void *u),
const char *boundary,
const char *start, *e;
int ret;
- if(!isboundary(s, boundary, bl)) return -1;
+ /* 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;
+ if(!(e = strstr(s, "\r\n")))
+ return -1;
s = e + 2;
}
if((ret = callback(xstrndup(start,
return 0;
}
+/** @brief Parse an RFC2388-style content-disposition field
+ * @param s Start of field
+ * @param dispositionp Where to store disposition
+ * @param parameternamep Where to store parameter name
+ * @param parametervaluep Wher to store parameter value
+ * @return 0 on success, non-0 on error
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2388#section-3">RFC 2388 s3</a>
+ * and <a href="http://tools.ietf.org/html/rfc2183">RFC 2183</a>.
+ */
int mime_rfc2388_content_disposition(const char *s,
char **dispositionp,
char **parameternamep,
char **parametervaluep) {
- struct dynstr disposition, parametername, parametervalue;
+ struct dynstr disposition, parametername;
dynstr_init(&disposition);
- if(!(s = skipwhite(s))) return -1;
+ 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))) return -1;
+ if(!(s = skipwhite(s, 1))) return -1;
if(*s == ';') {
dynstr_init(¶metername);
++s;
- if(!(s = skipwhite(s))) return -1;
+ if(!(s = skipwhite(s, 1))) return -1;
if(!*s) return -1;
while(*s && !tspecial(*s) && !whitespace(*s))
dynstr_append(¶metername, tolower((unsigned char)*s++));
- if(!(s = skipwhite(s))) return -1;
+ if(!(s = skipwhite(s, 1))) return -1;
if(*s++ != '=') return -1;
- if(!(s = skipwhite(s))) return -1;
- if(*s == '"') {
- if(!(s = parsestring(s, parametervaluep))) return -1;
- } else {
- dynstr_init(¶metervalue);
- while(*s && !tspecial(*s) && !whitespace(*s))
- dynstr_append(¶metervalue, *s++);
- dynstr_terminate(¶metervalue);
- *parametervaluep = parametervalue.vec;
- }
- if(!(s = skipwhite(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(¶metername);
*parameternamep = parametername.vec;
} else
return 0;
}
+/** @brief Convert MIME quoted-printable
+ * @param s Quoted-printable data
+ * @return Decoded data
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2045#section-6.7">RFC 2045
+ * s6.7</a>.
+ */
char *mime_qp(const char *s) {
struct dynstr d;
int c, a, b;
return d.vec;
}
-char *mime_base64(const char *s) {
- struct dynstr d;
- const char *t;
- int b[4], n, c;
- static const char table[] =
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+/** @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;
- dynstr_init(&d);
- n = 0;
- while((c = (unsigned char)*s++)) {
- if((t = strchr(table, c))) {
- b[n++] = t - table;
- if(n == 4) {
- dynstr_append(&d, (b[0] << 2) + (b[1] >> 4));
- dynstr_append(&d, (b[1] << 4) + (b[2] >> 2));
- dynstr_append(&d, (b[2] << 6) + b[3]);
- n = 0;
- }
- } else if(c == '=') {
- if(n >= 2) {
- dynstr_append(&d, (b[0] << 2) + (b[1] >> 4));
- if(n == 3)
- dynstr_append(&d, (b[1] << 4) + (b[2] >> 2));
+ 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;
+ }
}
- break;
+ } 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;
}
}
- dynstr_terminate(&d);
- return d.vec;
+ 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;
}
/*
~mdw / disorder / blobdiff