parse.h File Reference

Miscellaneous email parsing routines. More...

#include "config.h"
#include <stdbool.h>
#include <stdio.h>
#include "mime.h"

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Functions
void	mutt_auto_subscribe (const char *mailto)
	Check if user is subscribed to mailing list.
int	mutt_check_encoding (const char *c)
	Check the encoding type.
enum ContentType	mutt_check_mime_type (const char *s)
	Check a MIME type string.
char *	mutt_extract_message_id (const char *s, size_t *len)
	Find a message-id.
bool	mutt_is_message_type (int type, const char *subtype)
	Determine if a mime type matches a message or not.
bool	mutt_matches_ignore (const char *s)
	Does the string match the ignore list.
void	mutt_parse_content_type (const char *s, struct Body *b)
	Parse a content type.
bool	mutt_parse_mailto (struct Envelope *env, char **body, const char *src)
	Parse a mailto:// url.
struct Body *	mutt_parse_multipart (FILE *fp, const char *boundary, LOFF_T end_off, bool digest)
	Parse a multipart structure.
void	mutt_parse_part (FILE *fp, struct Body *b)
	Parse a MIME part.
struct Body *	mutt_read_mime_header (FILE *fp, bool digest)
	Parse a MIME header.
int	mutt_rfc822_parse_line (struct Envelope *env, struct Email *e, const char *name, size_t name_len, const char *body, bool user_hdrs, bool weed, bool do_2047)
	Parse an email header.
struct Body *	mutt_rfc822_parse_message (FILE *fp, struct Body *b)
	Parse a Message/RFC822 body.
struct Envelope *	mutt_rfc822_read_header (FILE *fp, struct Email *e, bool user_hdrs, bool weed)
	Parses an RFC822 header.
size_t	mutt_rfc822_read_line (FILE *fp, struct Buffer *out)
	Read a header line from a file.
void	mutt_filter_commandline_header_tag (char *header)
	Sanitise characters in a header tag.
void	mutt_filter_commandline_header_value (char *header)
	Sanitise characters in a header value.

Detailed Description

Miscellaneous email parsing routines.

Authors

• Richard Russon
• Pietro Cerutti

Copyright

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, see http://www.gnu.org/licenses/.

Definition in file parse.h.

Function Documentation

mutt_auto_subscribe()

void mutt_auto_subscribe

(

const char *

mailto

)

Check if user is subscribed to mailing list.

Parameters

mailto

URL of mailing list subscribe

Definition at line 108 of file parse.c.

{
  if (!mailto)
    return;
 
  if (!AutoSubscribeCache)
    AutoSubscribeCache = mutt_hash_new(200, MUTT_HASH_STRCASECMP | MUTT_HASH_STRDUP_KEYS);
 
  if (mutt_hash_find(AutoSubscribeCache, mailto))
    return;
 
  mutt_hash_insert(AutoSubscribeCache, mailto, AutoSubscribeCache);
 
  struct Envelope *lpenv = mutt_env_new(); /* parsed envelope from the List-Post mailto: URL */
 
  if (mutt_parse_mailto(lpenv, NULL, mailto) && !TAILQ_EMPTY(&lpenv->to))
  {
    const char *mailbox = buf_string(TAILQ_FIRST(&lpenv->to)->mailbox);
    if (mailbox && !mutt_regexlist_match(&SubscribedLists, mailbox) &&
        !mutt_regexlist_match(&UnMailLists, mailbox) &&
        !mutt_regexlist_match(&UnSubscribedLists, mailbox))
    {
      /* mutt_regexlist_add() detects duplicates, so it is safe to
       * try to add here without any checks. */
      mutt_regexlist_add(&MailLists, mailbox, REG_ICASE, NULL);
      mutt_regexlist_add(&SubscribedLists, mailbox, REG_ICASE, NULL);
    }
  }
 
  mutt_env_free(&lpenv);
}

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mutt_check_encoding()

int mutt_check_encoding

(

const char *

c

)

Check the encoding type.

Parameters

c	String to check

Return values

enum	ContentEncoding, e.g. ENC_QUOTED_PRINTABLE

Definition at line 436 of file parse.c.

{
  if (mutt_istr_startswith(c, "7bit"))
    return ENC_7BIT;
  if (mutt_istr_startswith(c, "8bit"))
    return ENC_8BIT;
  if (mutt_istr_startswith(c, "binary"))
    return ENC_BINARY;
  if (mutt_istr_startswith(c, "quoted-printable"))
    return ENC_QUOTED_PRINTABLE;
  if (mutt_istr_startswith(c, "base64"))
    return ENC_BASE64;
  if (mutt_istr_startswith(c, "x-uuencode"))
    return ENC_UUENCODED;
  if (mutt_istr_startswith(c, "uuencode"))
    return ENC_UUENCODED;
  return ENC_OTHER;
}

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mutt_check_mime_type()

enum ContentType mutt_check_mime_type

(

const char *

s

)

Check a MIME type string.

Parameters

s	String to check

Return values

enum	ContentType, e.g. TYPE_TEXT

Definition at line 365 of file parse.c.

{
  if (mutt_istr_equal("text", s))
    return TYPE_TEXT;
  if (mutt_istr_equal("multipart", s))
    return TYPE_MULTIPART;
  if (mutt_istr_equal("x-sun-attachment", s))
    return TYPE_MULTIPART;
  if (mutt_istr_equal("application", s))
    return TYPE_APPLICATION;
  if (mutt_istr_equal("message", s))
    return TYPE_MESSAGE;
  if (mutt_istr_equal("image", s))
    return TYPE_IMAGE;
  if (mutt_istr_equal("audio", s))
    return TYPE_AUDIO;
  if (mutt_istr_equal("video", s))
    return TYPE_VIDEO;
  if (mutt_istr_equal("model", s))
    return TYPE_MODEL;
  if (mutt_istr_equal("*", s))
    return TYPE_ANY;
  if (mutt_istr_equal(".*", s))
    return TYPE_ANY;
 
  return TYPE_OTHER;
}

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mutt_extract_message_id()

char * mutt_extract_message_id	(	const char *	s,
		size_t *	len
	)

Find a message-id.

Parameters

[in]	s	String to parse
[out]	len	Number of bytes of s parsed

Return values

ptr	Message id found
NULL	No more message ids

Definition at line 400 of file parse.c.

{
  if (!s || (*s == '\0'))
    return NULL;
 
  char *decoded = mutt_str_dup(s);
  rfc2047_decode(&decoded);
 
  char *res = NULL;
 
  for (const char *p = decoded, *beg = NULL; *p; p++)
  {
    if (*p == '<')
    {
      beg = p;
      continue;
    }
 
    if (beg && (*p == '>'))
    {
      if (len)
        *len = p - decoded + 1;
      res = mutt_strn_dup(beg, (p + 1) - beg);
      break;
    }
  }
 
  FREE(&decoded);
  return res;
}

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mutt_is_message_type()

bool mutt_is_message_type	(	int	type,
		const char *	subtype
	)

Determine if a mime type matches a message or not.

Parameters

type	Message type enum value
subtype	Message subtype

Return values

true	Type is message/news or message/rfc822
false	Otherwise

Definition at line 1497 of file parse.c.

{
  if (type != TYPE_MESSAGE)
    return false;
 
  subtype = NONULL(subtype);
  return (mutt_istr_equal(subtype, "rfc822") ||
          mutt_istr_equal(subtype, "news") || mutt_istr_equal(subtype, "global"));
}

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mutt_matches_ignore()

bool mutt_matches_ignore

(

const char *

s

)

Does the string match the ignore list.

Parameters

s	String to check

Return values

true	String matches

Checks Ignore and UnIgnore using mutt_list_match

Definition at line 355 of file parse.c.

{
  return mutt_list_match(s, &Ignore) && !mutt_list_match(s, &UnIgnore);
}

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mutt_parse_content_type()

void mutt_parse_content_type	(	const char *	s,
		struct Body *	b
	)

Parse a content type.

Parameters

s	String to parse
b	Body to save the result

e.g. parse a string "inline" and set DISP_INLINE.

Definition at line 462 of file parse.c.

{
  if (!s || !b)
    return;
 
  FREE(&b->subtype);
  mutt_param_free(&b->parameter);
 
  /* First extract any existing parameters */
  char *pc = strchr(s, ';');
  if (pc)
  {
    *pc++ = 0;
    while (*pc && mutt_isspace(*pc))
      pc++;
    parse_parameters(&b->parameter, pc, false);
 
    /* Some pre-RFC1521 gateways still use the "name=filename" convention,
     * but if a filename has already been set in the content-disposition,
     * let that take precedence, and don't set it here */
    pc = mutt_param_get(&b->parameter, "name");
    if (pc && !b->filename)
      b->filename = mutt_str_dup(pc);
 
    /* this is deep and utter perversion */
    pc = mutt_param_get(&b->parameter, "conversions");
    if (pc)
      b->encoding = mutt_check_encoding(pc);
  }
 
  /* Now get the subtype */
  char *subtype = strchr(s, '/');
  if (subtype)
  {
    *subtype++ = '\0';
    for (pc = subtype; *pc && !mutt_isspace(*pc) && (*pc != ';'); pc++)
      ; // do nothing
 
    *pc = '\0';
    mutt_str_replace(&b->subtype, subtype);
  }
 
  /* Finally, get the major type */
  b->type = mutt_check_mime_type(s);
 
  if (mutt_istr_equal("x-sun-attachment", s))
    mutt_str_replace(&b->subtype, "x-sun-attachment");
 
  if (b->type == TYPE_OTHER)
  {
    mutt_str_replace(&b->xtype, s);
  }
 
  if (!b->subtype)
  {
    /* Some older non-MIME mailers (i.e., mailtool, elm) have a content-type
     * field, so we can attempt to convert the type to Body here.  */
    if (b->type == TYPE_TEXT)
    {
      b->subtype = mutt_str_dup("plain");
    }
    else if (b->type == TYPE_AUDIO)
    {
      b->subtype = mutt_str_dup("basic");
    }
    else if (b->type == TYPE_MESSAGE)
    {
      b->subtype = mutt_str_dup("rfc822");
    }
    else if (b->type == TYPE_OTHER)
    {
      char buf[128] = { 0 };
 
      b->type = TYPE_APPLICATION;
      snprintf(buf, sizeof(buf), "x-%s", s);
      b->subtype = mutt_str_dup(buf);
    }
    else
    {
      b->subtype = mutt_str_dup("x-unknown");
    }
  }
 
  /* Default character set for text types. */
  if (b->type == TYPE_TEXT)
  {
    pc = mutt_param_get(&b->parameter, "charset");
    if (pc)
    {
      /* Microsoft Outlook seems to think it is necessary to repeat
       * charset=, strip it off not to confuse ourselves */
      if (mutt_istrn_equal(pc, "charset=", sizeof("charset=") - 1))
        mutt_param_set(&b->parameter, "charset", pc + (sizeof("charset=") - 1));
    }
    else
    {
      mutt_param_set(&b->parameter, "charset",
                     mutt_ch_get_default_charset(cc_assumed_charset()));
    }
  }
}

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mutt_parse_mailto()

bool mutt_parse_mailto	(	struct Envelope *	env,
		char **	body,
		const char *	src
	)

Parse a mailto:// url.

Parameters

[in]	env	Envelope to fill
[out]	body	Body to
[in]	src	String to parse

Return values

true	Success
false	Error

Definition at line 1753 of file parse.c.

{
  if (!env || !src)
    return false;
 
  struct Url *url = url_parse(src);
  if (!url)
    return false;
 
  if (url->host)
  {
    /* this is not a path-only URL */
    url_free(&url);
    return false;
  }
 
  mutt_addrlist_parse(&env->to, url->path);
 
  struct UrlQuery *np;
  STAILQ_FOREACH(np, &url->query_strings, entries)
  {
    mutt_filter_commandline_header_tag(np->name);
    const char *tag = np->name;
    char *value = np->value;
    /* Determine if this header field is on the allowed list.  Since NeoMutt
     * interprets some header fields specially (such as
     * "Attach: ~/.gnupg/secring.gpg"), care must be taken to ensure that
     * only safe fields are allowed.
     *
     * RFC2368, "4. Unsafe headers"
     * The user agent interpreting a mailto URL SHOULD choose not to create
     * a message if any of the headers are considered dangerous; it may also
     * choose to create a message with only a subset of the headers given in
     * the URL.  */
    if (mailto_header_allowed(tag, &MailToAllow))
    {
      if (mutt_istr_equal(tag, "body"))
      {
        if (body)
          mutt_str_replace(body, value);
      }
      else
      {
        char *scratch = NULL;
        size_t taglen = mutt_str_len(tag);
 
        mutt_filter_commandline_header_value(value);
        mutt_str_asprintf(&scratch, "%s: %s", tag, value);
        scratch[taglen] = 0; /* overwrite the colon as mutt_rfc822_parse_line expects */
        value = mutt_str_skip_email_wsp(&scratch[taglen + 1]);
        mutt_rfc822_parse_line(env, NULL, scratch, taglen, value, true, false, true);
        FREE(&scratch);
      }
    }
  }
 
  /* RFC2047 decode after the RFC822 parsing */
  rfc2047_decode_envelope(env);
 
  url_free(&url);
  return true;
}

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mutt_parse_multipart()

struct Body * mutt_parse_multipart	(	FILE *	fp,
		const char *	boundary,
		LOFF_T	end_off,
		bool	digest
	)

Parse a multipart structure.

Parameters

fp	Stream to read from
boundary	Body separator
end_off	Length of the multipart body (used when the final boundary is missing to avoid reading too far)
digest	true if reading a multipart/digest

Return values

ptr	New Body containing parsed structure

Definition at line 1852 of file parse.c.

{
  int counter = 0;
 
  return parse_multipart(fp, boundary, end_off, digest, &counter);
}

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mutt_parse_part()

void mutt_parse_part	(	FILE *	fp,
		struct Body *	b
	)

Parse a MIME part.

Parameters

fp	File to read from
b	Body to store the results in

Definition at line 1821 of file parse.c.

{
  int counter = 0;
 
  parse_part(fp, b, &counter);
}

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mutt_read_mime_header()

struct Body * mutt_read_mime_header	(	FILE *	fp,
		bool	digest
	)

Parse a MIME header.

Parameters

fp	stream to read from
digest	true if reading subparts of a multipart/digest

Return values

ptr	New Body containing parsed structure

Definition at line 1361 of file parse.c.

{
  if (!fp)
    return NULL;
 
  struct Body *b = mutt_body_new();
  struct Envelope *env = mutt_env_new();
  char *c = NULL;
  struct Buffer *buf = buf_pool_get();
  bool matched = false;
 
  b->hdr_offset = ftello(fp);
 
  b->encoding = ENC_7BIT; /* default from RFC1521 */
  b->type = digest ? TYPE_MESSAGE : TYPE_TEXT;
  b->disposition = DISP_INLINE;
 
  while (mutt_rfc822_read_line(fp, buf) != 0)
  {
    const char *line = buf_string(buf);
    /* Find the value of the current header */
    c = strchr(line, ':');
    if (c)
    {
      *c = '\0';
      c = mutt_str_skip_email_wsp(c + 1);
      if (*c == '\0')
      {
        mutt_debug(LL_DEBUG1, "skipping empty header field: %s\n", line);
        continue;
      }
    }
    else
    {
      mutt_debug(LL_DEBUG1, "bogus MIME header: %s\n", line);
      break;
    }
 
    size_t plen = mutt_istr_startswith(line, "content-");
    if (plen != 0)
    {
      if (mutt_istr_equal("type", line + plen))
      {
        mutt_parse_content_type(c, b);
      }
      else if (mutt_istr_equal("language", line + plen))
      {
        parse_content_language(c, b);
      }
      else if (mutt_istr_equal("transfer-encoding", line + plen))
      {
        b->encoding = mutt_check_encoding(c);
      }
      else if (mutt_istr_equal("disposition", line + plen))
      {
        parse_content_disposition(c, b);
      }
      else if (mutt_istr_equal("description", line + plen))
      {
        mutt_str_replace(&b->description, c);
        rfc2047_decode(&b->description);
      }
      else if (mutt_istr_equal("id", line + plen))
      {
        // strip <angle braces> from Content-ID: header
        char *id = c;
        int cid_len = mutt_str_len(c);
        if (cid_len > 2)
        {
          if (id[0] == '<')
          {
            id++;
            cid_len--;
          }
          if (id[cid_len - 1] == '>')
            id[cid_len - 1] = '\0';
        }
        mutt_str_replace(&b->content_id, id);
      }
    }
    else if ((plen = mutt_istr_startswith(line, "x-sun-")))
    {
      if (mutt_istr_equal("data-type", line + plen))
      {
        mutt_parse_content_type(c, b);
      }
      else if (mutt_istr_equal("encoding-info", line + plen))
      {
        b->encoding = mutt_check_encoding(c);
      }
      else if (mutt_istr_equal("content-lines", line + plen))
      {
        mutt_param_set(&b->parameter, "content-lines", c);
      }
      else if (mutt_istr_equal("data-description", line + plen))
      {
        mutt_str_replace(&b->description, c);
        rfc2047_decode(&b->description);
      }
    }
    else
    {
      if (mutt_rfc822_parse_line(env, NULL, line, strlen(line), c, false, false, false))
      {
        matched = true;
      }
    }
  }
  b->offset = ftello(fp); /* Mark the start of the real data */
  if ((b->type == TYPE_TEXT) && !b->subtype)
    b->subtype = mutt_str_dup("plain");
  else if ((b->type == TYPE_MESSAGE) && !b->subtype)
    b->subtype = mutt_str_dup("rfc822");
 
  buf_pool_release(&buf);
 
  if (matched)
  {
    b->mime_headers = env;
    rfc2047_decode_envelope(b->mime_headers);
  }
  else
  {
    mutt_env_free(&env);
  }
 
  return b;
}

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mutt_rfc822_parse_line()

int mutt_rfc822_parse_line	(	struct Envelope *	env,
		struct Email *	e,
		const char *	name,
		size_t	name_len,
		const char *	body,
		bool	user_hdrs,
		bool	weed,
		bool	do_2047
	)

Parse an email header.

Parameters

env	Envelope of the email
e	Email
name	Header field name, e.g. 'to'
name_len	Must be equivalent to strlen(name)
body	Header field body, e.g. 'john@.nosp@m.exam.nosp@m.ple.c.nosp@m.om'
user_hdrs	If true, save into the Envelope's userhdrs
weed	If true, perform header weeding (filtering)
do_2047	If true, perform RFC2047 decoding of the field

Return values

1	The field is recognised
0	The field is not recognised

Process a line from an email header. Each line that is recognised is parsed and the information put in the Envelope or Header.

Definition at line 677 of file parse.c.

{
  if (!env || !name)
    return 0;
 
  bool matched = false;
 
  switch (name[0] | 0x20)
  {
    case 'a':
      if ((name_len == 13) && eqi12(name + 1, "pparently-to"))
      {
        mutt_addrlist_parse(&env->to, body);
        matched = true;
      }
      else if ((name_len == 15) && eqi14(name + 1, "pparently-from"))
      {
        mutt_addrlist_parse(&env->from, body);
        matched = true;
      }
#ifdef USE_AUTOCRYPT
      else if ((name_len == 9) && eqi8(name + 1, "utocrypt"))
      {
        const bool c_autocrypt = cs_subset_bool(NeoMutt->sub, "autocrypt");
        if (c_autocrypt)
        {
          env->autocrypt = parse_autocrypt(env->autocrypt, body);
          matched = true;
        }
      }
      else if ((name_len == 16) && eqi15(name + 1, "utocrypt-gossip"))
      {
        const bool c_autocrypt = cs_subset_bool(NeoMutt->sub, "autocrypt");
        if (c_autocrypt)
        {
          env->autocrypt_gossip = parse_autocrypt(env->autocrypt_gossip, body);
          matched = true;
        }
      }
#endif
      break;
 
    case 'b':
      if ((name_len == 3) && eqi2(name + 1, "cc"))
      {
        mutt_addrlist_parse(&env->bcc, body);
        matched = true;
      }
      break;
 
    case 'c':
      if ((name_len == 2) && eqi1(name + 1, "c"))
      {
        mutt_addrlist_parse(&env->cc, body);
        matched = true;
      }
      else
      {
        if ((name_len >= 12) && eqi8(name, "content-"))
        {
          if ((name_len == 12) && eqi4(name + 8, "type"))
          {
            if (e)
              mutt_parse_content_type(body, e->body);
            matched = true;
          }
          else if ((name_len == 16) && eqi8(name + 8, "language"))
          {
            if (e)
              parse_content_language(body, e->body);
            matched = true;
          }
          else if ((name_len == 25) && eqi17(name + 8, "transfer-encoding"))
          {
            if (e)
              e->body->encoding = mutt_check_encoding(body);
            matched = true;
          }
          else if ((name_len == 14) && eqi8(name + 6, "t-length"))
          {
            if (e)
            {
              unsigned long len = 0;
              e->body->length = mutt_str_atoul(body, &len) ? MIN(len, CONTENT_TOO_BIG) : -1;
            }
            matched = true;
          }
          else if ((name_len == 19) && eqi11(name + 8, "description"))
          {
            if (e)
            {
              mutt_str_replace(&e->body->description, body);
              rfc2047_decode(&e->body->description);
            }
            matched = true;
          }
          else if ((name_len == 19) && eqi11(name + 8, "disposition"))
          {
            if (e)
              parse_content_disposition(body, e->body);
            matched = true;
          }
        }
      }
      break;
 
    case 'd':
      if ((name_len != 4) || !eqi4(name, "date"))
        break;
 
      mutt_str_replace(&env->date, body);
      if (e)
      {
        struct Tz tz = { 0 };
        // the caller will check e->date_sent for -1
        e->date_sent = mutt_date_parse_date(body, &tz);
        if (e->date_sent > 0)
        {
          e->zhours = tz.zhours;
          e->zminutes = tz.zminutes;
          e->zoccident = tz.zoccident;
        }
      }
      matched = true;
      break;
 
    case 'e':
      if ((name_len == 7) && eqi6(name + 1, "xpires") && e)
      {
        const time_t expired = mutt_date_parse_date(body, NULL);
        if ((expired != -1) && (expired < mutt_date_now()))
        {
          e->expired = true;
        }
      }
      break;
 
    case 'f':
      if ((name_len == 4) && eqi4(name, "from"))
      {
        mutt_addrlist_parse(&env->from, body);
        matched = true;
      }
      else if ((name_len == 11) && eqi10(name + 1, "ollowup-to"))
      {
        if (!env->followup_to)
        {
          env->followup_to = mutt_str_dup(mutt_str_skip_whitespace(body));
          mutt_str_remove_trailing_ws(env->followup_to);
        }
        matched = true;
      }
      break;
 
    case 'i':
      if ((name_len != 11) || !eqi10(name + 1, "n-reply-to"))
        break;
 
      mutt_list_free(&env->in_reply_to);
      char *body2 = mutt_str_dup(body); // Create a mutable copy
      mutt_filter_commandline_header_value(body2);
      parse_references(&env->in_reply_to, body2);
      FREE(&body2);
      matched = true;
      break;
 
    case 'l':
      if ((name_len == 5) && eqi4(name + 1, "ines"))
      {
        if (e)
        {
          unsigned int ui = 0; // we don't want a negative number of lines
          mutt_str_atoui(body, &ui);
          e->lines = ui;
        }
 
        matched = true;
      }
      else if ((name_len == 9) && eqi8(name + 1, "ist-post"))
      {
        /* RFC2369 */
        if (!mutt_strn_equal(mutt_str_skip_whitespace(body), "NO", 2))
        {
          char *mailto = rfc2369_first_mailto(body);
          if (mailto)
          {
            FREE(&env->list_post);
            env->list_post = mailto;
            const bool c_auto_subscribe = cs_subset_bool(NeoMutt->sub, "auto_subscribe");
            if (c_auto_subscribe)
              mutt_auto_subscribe(env->list_post);
          }
        }
        matched = true;
      }
      else if ((name_len == 14) && eqi13(name + 1, "ist-subscribe"))
      {
        /* RFC2369 */
        char *mailto = rfc2369_first_mailto(body);
        if (mailto)
        {
          FREE(&env->list_subscribe);
          env->list_subscribe = mailto;
        }
        matched = true;
      }
      else if ((name_len == 16) && eqi15(name + 1, "ist-unsubscribe"))
      {
        /* RFC2369 */
        char *mailto = rfc2369_first_mailto(body);
        if (mailto)
        {
          FREE(&env->list_unsubscribe);
          env->list_unsubscribe = mailto;
        }
        matched = true;
      }
      break;
 
    case 'm':
      if ((name_len == 12) && eqi11(name + 1, "ime-version"))
      {
        if (e)
          e->mime = true;
        matched = true;
      }
      else if ((name_len == 10) && eqi9(name + 1, "essage-id"))
      {
        /* We add a new "Message-ID:" when building a message */
        FREE(&env->message_id);
        env->message_id = mutt_extract_message_id(body, NULL);
        matched = true;
      }
      else
      {
        if ((name_len >= 13) && eqi4(name + 1, "ail-"))
        {
          if ((name_len == 13) && eqi8(name + 5, "reply-to"))
          {
            /* override the Reply-To: field */
            mutt_addrlist_clear(&env->reply_to);
            mutt_addrlist_parse(&env->reply_to, body);
            matched = true;
          }
          else if ((name_len == 16) && eqi11(name + 5, "followup-to"))
          {
            mutt_addrlist_parse(&env->mail_followup_to, body);
            matched = true;
          }
        }
      }
      break;
 
    case 'n':
      if ((name_len == 10) && eqi9(name + 1, "ewsgroups"))
      {
        FREE(&env->newsgroups);
        env->newsgroups = mutt_str_dup(mutt_str_skip_whitespace(body));
        mutt_str_remove_trailing_ws(env->newsgroups);
        matched = true;
      }
      break;
 
    case 'o':
      /* field 'Organization:' saves only for pager! */
      if ((name_len == 12) && eqi11(name + 1, "rganization"))
      {
        if (!env->organization && !mutt_istr_equal(body, "unknown"))
          env->organization = mutt_str_dup(body);
      }
      break;
 
    case 'r':
      if ((name_len == 10) && eqi9(name + 1, "eferences"))
      {
        mutt_list_free(&env->references);
        parse_references(&env->references, body);
        matched = true;
      }
      else if ((name_len == 8) && eqi8(name, "reply-to"))
      {
        mutt_addrlist_parse(&env->reply_to, body);
        matched = true;
      }
      else if ((name_len == 11) && eqi10(name + 1, "eturn-path"))
      {
        mutt_addrlist_parse(&env->return_path, body);
        matched = true;
      }
      else if ((name_len == 8) && eqi8(name, "received"))
      {
        if (e && (e->received == 0))
        {
          char *d = strrchr(body, ';');
          if (d)
          {
            d = mutt_str_skip_email_wsp(d + 1);
            // the caller will check e->received for -1
            e->received = mutt_date_parse_date(d, NULL);
          }
        }
      }
      break;
 
    case 's':
      if ((name_len == 7) && eqi6(name + 1, "ubject"))
      {
        if (!env->subject)
          mutt_env_set_subject(env, body);
        matched = true;
      }
      else if ((name_len == 6) && eqi5(name + 1, "ender"))
      {
        mutt_addrlist_parse(&env->sender, body);
        matched = true;
      }
      else if ((name_len == 6) && eqi5(name + 1, "tatus"))
      {
        if (e)
        {
          while (*body)
          {
            switch (*body)
            {
              case 'O':
              {
                e->old = true;
                break;
              }
              case 'R':
                e->read = true;
                break;
              case 'r':
                e->replied = true;
                break;
            }
            body++;
          }
        }
        matched = true;
      }
      else if (e && (name_len == 10) && eqi1(name + 1, "u") &&
               (eqi8(name + 2, "persedes") || eqi8(name + 2, "percedes")))
      {
        FREE(&env->supersedes);
        env->supersedes = mutt_str_dup(body);
      }
      break;
 
    case 't':
      if ((name_len == 2) && eqi1(name + 1, "o"))
      {
        mutt_addrlist_parse(&env->to, body);
        matched = true;
      }
      break;
 
    case 'x':
      if ((name_len == 8) && eqi8(name, "x-status"))
      {
        if (e)
        {
          while (*body)
          {
            switch (*body)
            {
              case 'A':
                e->replied = true;
                break;
              case 'D':
                e->deleted = true;
                break;
              case 'F':
                e->flagged = true;
                break;
              default:
                break;
            }
            body++;
          }
        }
        matched = true;
      }
      else if ((name_len == 7) && eqi6(name + 1, "-label"))
      {
        FREE(&env->x_label);
        env->x_label = mutt_str_dup(body);
        matched = true;
      }
      else if ((name_len == 12) && eqi11(name + 1, "-comment-to"))
      {
        if (!env->x_comment_to)
          env->x_comment_to = mutt_str_dup(body);
        matched = true;
      }
      else if ((name_len == 4) && eqi4(name, "xref"))
      {
        if (!env->xref)
          env->xref = mutt_str_dup(body);
        matched = true;
      }
      else if ((name_len == 13) && eqi12(name + 1, "-original-to"))
      {
        mutt_addrlist_parse(&env->x_original_to, body);
        matched = true;
      }
      break;
 
    default:
      break;
  }
 
  /* Keep track of the user-defined headers */
  if (!matched && user_hdrs)
  {
    const bool c_weed = cs_subset_bool(NeoMutt->sub, "weed");
    char *dup = NULL;
    mutt_str_asprintf(&dup, "%s: %s", name, body);
 
    if (!weed || !c_weed || !mutt_matches_ignore(dup))
    {
      struct ListNode *np = mutt_list_insert_tail(&env->userhdrs, dup);
      if (do_2047)
      {
        rfc2047_decode(&np->data);
      }
    }
    else
    {
      FREE(&dup);
    }
  }
 
  return matched;
}

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mutt_rfc822_parse_message()

struct Body * mutt_rfc822_parse_message	(	FILE *	fp,
		struct Body *	b
	)

Parse a Message/RFC822 body.

Parameters

fp	Stream to read from
b	Info about the message/rfc822 body part

Return values

ptr	New Body containing parsed message

Note

This assumes that 'b->length' has been set!

Definition at line 1836 of file parse.c.

{
  int counter = 0;
 
  return rfc822_parse_message(fp, b, &counter);
}

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mutt_rfc822_read_header()

struct Envelope * mutt_rfc822_read_header	(	FILE *	fp,
		struct Email *	e,
		bool	user_hdrs,
		bool	weed
	)

Parses an RFC822 header.

Parameters

fp	Stream to read from
e	Current Email (optional)
user_hdrs	If set, store user headers Used for recall-message and postpone modes
weed	If this parameter is set and the user has activated the $weed option, honor the header weed list for user headers. Used for recall-message

Return values

ptr	Newly allocated envelope structure

Caller should free the Envelope using mutt_env_free().

Definition at line 1204 of file parse.c.

{
  if (!fp)
    return NULL;
 
  struct Envelope *env = mutt_env_new();
  char *p = NULL;
  LOFF_T loc = e ? e->offset : ftello(fp);
  if (loc < 0)
  {
    mutt_debug(LL_DEBUG1, "ftello: %s (errno %d)\n", strerror(errno), errno);
    loc = 0;
  }
 
  struct Buffer *line = buf_pool_get();
 
  if (e)
  {
    if (!e->body)
    {
      e->body = mutt_body_new();
 
      /* set the defaults from RFC1521 */
      e->body->type = TYPE_TEXT;
      e->body->subtype = mutt_str_dup("plain");
      e->body->encoding = ENC_7BIT;
      e->body->length = -1;
 
      /* RFC2183 says this is arbitrary */
      e->body->disposition = DISP_INLINE;
    }
  }
 
  while (true)
  {
    LOFF_T line_start_loc = loc;
    size_t len = mutt_rfc822_read_line(fp, line);
    if (buf_is_empty(line))
    {
      break;
    }
    loc += len;
    const char *lines = buf_string(line);
    p = strpbrk(lines, ": \t");
    if (!p || (*p != ':'))
    {
      char return_path[1024] = { 0 };
      time_t t = 0;
 
      /* some bogus MTAs will quote the original "From " line */
      if (mutt_str_startswith(lines, ">From "))
      {
        continue; /* just ignore */
      }
      else if (is_from(lines, return_path, sizeof(return_path), &t))
      {
        /* MH sometimes has the From_ line in the middle of the header! */
        if (e && (e->received == 0))
          e->received = t - mutt_date_local_tz(t);
        continue;
      }
 
      /* We need to seek back to the start of the body. Note that we
       * keep track of loc ourselves, since calling ftello() incurs
       * a syscall, which can be expensive to do for every single line */
      (void) mutt_file_seek(fp, line_start_loc, SEEK_SET);
      break; /* end of header */
    }
    size_t name_len = p - lines;
 
    char buf[1024] = { 0 };
    if (mutt_replacelist_match(&SpamList, buf, sizeof(buf), lines))
    {
      if (!mutt_regexlist_match(&NoSpamList, lines))
      {
        /* if spam tag already exists, figure out how to amend it */
        if ((!buf_is_empty(&env->spam)) && (*buf != '\0'))
        {
          /* If `$spam_separator` defined, append with separator */
          const char *const c_spam_separator = cs_subset_string(NeoMutt->sub, "spam_separator");
          if (c_spam_separator)
          {
            buf_addstr(&env->spam, c_spam_separator);
            buf_addstr(&env->spam, buf);
          }
          else /* overwrite */
          {
            buf_reset(&env->spam);
            buf_addstr(&env->spam, buf);
          }
        }
        else if (buf_is_empty(&env->spam) && (*buf != '\0'))
        {
          /* spam tag is new, and match expr is non-empty; copy */
          buf_addstr(&env->spam, buf);
        }
        else if (buf_is_empty(&env->spam))
        {
          /* match expr is empty; plug in null string if no existing tag */
          buf_addstr(&env->spam, "");
        }
 
        if (!buf_is_empty(&env->spam))
          mutt_debug(LL_DEBUG5, "spam = %s\n", env->spam.data);
      }
    }
 
    *p = '\0';
    p = mutt_str_skip_email_wsp(p + 1);
    if (*p == '\0')
      continue; /* skip empty header fields */
 
    mutt_rfc822_parse_line(env, e, lines, name_len, p, user_hdrs, weed, true);
  }
 
  buf_pool_release(&line);
 
  if (e)
  {
    e->body->hdr_offset = e->offset;
    e->body->offset = ftello(fp);
 
    rfc2047_decode_envelope(env);
 
    if (e->received < 0)
    {
      mutt_debug(LL_DEBUG1, "resetting invalid received time to 0\n");
      e->received = 0;
    }
 
    /* check for missing or invalid date */
    if (e->date_sent <= 0)
    {
      mutt_debug(LL_DEBUG1, "no date found, using received time from msg separator\n");
      e->date_sent = e->received;
    }
 
#ifdef USE_AUTOCRYPT
    const bool c_autocrypt = cs_subset_bool(NeoMutt->sub, "autocrypt");
    if (c_autocrypt)
    {
      mutt_autocrypt_process_autocrypt_header(e, env);
      /* No sense in taking up memory after the header is processed */
      mutt_autocrypthdr_free(&env->autocrypt);
    }
#endif
  }
 
  return env;
}

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mutt_rfc822_read_line()

size_t mutt_rfc822_read_line	(	FILE *	fp,
		struct Buffer *	buf
	)

Read a header line from a file.

Parameters

fp	File to read from
buf	Buffer to store the result

Return values

num	Number of bytes read from fp

Reads an arbitrarily long header field, and looks ahead for continuation lines.

Definition at line 1124 of file parse.c.

{
  if (!fp || !buf)
    return 0;
 
  size_t read = 0;
  char line[1024] = { 0 }; /* RFC2822 specifies a maximum line length of 998 */
 
  buf_reset(buf);
  while (true)
  {
    if (!fgets(line, sizeof(line), fp))
    {
      return 0;
    }
 
    const size_t linelen = mutt_str_len(line);
    if (linelen == 0)
    {
      break;
    }
 
    if (mutt_str_is_email_wsp(line[0]) && buf_is_empty(buf))
    {
      read = linelen;
      break;
    }
 
    read += linelen;
 
    size_t off = linelen - 1;
    if (line[off] == '\n')
    {
      /* We did get a full line: remove trailing space */
      do
      {
        line[off] = '\0';
      } while (off && mutt_str_is_email_wsp(line[--off]));
 
      /* check to see if the next line is a continuation line */
      int ch = fgetc(fp);
      if ((ch != ' ') && (ch != '\t'))
      {
        /* next line is a separate header field or EOH */
        ungetc(ch, fp);
        buf_addstr(buf, line);
        break;
      }
      read++;
 
      /* eat tabs and spaces from the beginning of the continuation line */
      while (((ch = fgetc(fp)) == ' ') || (ch == '\t'))
      {
        read++;
      }
 
      ungetc(ch, fp);
      line[off + 1] = ' '; /* string is still terminated because we removed
                              at least one whitespace char above */
    }
 
    buf_addstr(buf, line);
  }
 
  return read;
}

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mutt_filter_commandline_header_tag()

void mutt_filter_commandline_header_tag

(

char *

header

)

Sanitise characters in a header tag.

Parameters

header

String to sanitise

Definition at line 72 of file parse.c.

{
  if (!header)
    return;
 
  for (; (*header != '\0'); header++)
  {
    if ((*header < 33) || (*header > 126) || (*header == ':'))
      *header = '?';
  }
}

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mutt_filter_commandline_header_value()

void mutt_filter_commandline_header_value

(

char *

header

)

Sanitise characters in a header value.

Parameters

header

String to sanitise

It might be preferable to use mutt_filter_unprintable() instead. This filter is being lax, but preventing a header injection via an embedded newline.

Definition at line 92 of file parse.c.

{
  if (!header)
    return;
 
  for (; (*header != '\0'); header++)
  {
    if ((*header == '\n') || (*header == '\r'))
      *header = ' ';
  }
}

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