header.c File Reference

Write a MIME Email Header to a file. More...

#include "config.h"
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include "mutt/lib.h"
#include "address/lib.h"
#include "config/lib.h"
#include "email/lib.h"
#include "gui/lib.h"
#include "header.h"
#include "globals.h"
#include "autocrypt/lib.h"

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Go to the source code of this file.

Data Structures
struct	UserHdrsOverride
	Which headers have been overridden. More...

Enumerations
enum	UserHdrsOverrideIdx { USERHDRS_OVERRIDE_CONTENT_TYPE , USERHDRS_OVERRIDE_USER_AGENT }
	Headers that the user may override. More...

Functions
static int	print_val (FILE *fp, const char *pfx, const char *value, CopyHeaderFlags chflags, size_t col)
	Add pieces to an email header, wrapping where necessary.
static int	fold_one_header (FILE *fp, const char *tag, const char *value, size_t vlen, const char *pfx, int wraplen, CopyHeaderFlags chflags)
	Fold one header line.
static char *	unfold_header (char *s)
	Unfold a wrapped email header.
static int	userhdrs_override_cmp (const void *a, const void *b)
	Compare a user-defined header with an element of the UserhdrsOverrideHeaders list.
static int	write_one_header (FILE *fp, int pfxw, int max, int wraplen, const char *pfx, const char *start, const char *end, CopyHeaderFlags chflags)
	Write out one header line.
static struct UserHdrsOverride	write_userhdrs (FILE *fp, const struct ListHead *userhdrs, bool privacy, struct ConfigSubset *sub)
	Write user-defined headers and keep track of the interesting ones.
int	mutt_write_one_header (FILE *fp, const char *tag, const char *value, const char *pfx, int wraplen, CopyHeaderFlags chflags, struct ConfigSubset *sub)
	Write one header line to a file.
void	mutt_write_references (const struct ListHead *r, FILE *fp, size_t trim)
	Add the message references to a list.
int	mutt_rfc822_write_header (FILE *fp, struct Envelope *env, struct Body *attach, enum MuttWriteHeaderMode mode, bool privacy, bool hide_protected_subject, struct ConfigSubset *sub)
	Write out one RFC822 header line.
int	mutt_write_mime_header (struct Body *a, FILE *fp, struct ConfigSubset *sub)
	Create a MIME header.

Variables
static const char *const	UserhdrsOverrideHeaders []
	The next array/enum pair is used to to keep track of user headers that override pre-defined headers NeoMutt would emit.

Detailed Description

Write a MIME Email Header to a file.

Authors

• Richard Russon

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 header.c.

Enumeration Type Documentation

UserHdrsOverrideIdx

enum UserHdrsOverrideIdx

Headers that the user may override.

Enumerator
USERHDRS_OVERRIDE_CONTENT_TYPE	Override the "Content-Type".
USERHDRS_OVERRIDE_USER_AGENT	Override the "User-Agent".

Definition at line 57 of file header.c.

{
  USERHDRS_OVERRIDE_CONTENT_TYPE, 
  USERHDRS_OVERRIDE_USER_AGENT,   
};

Function Documentation

print_val()

static int print_val ( FILE *  fp, const char *  pfx, const char *  value, CopyHeaderFlags  chflags, size_t  col  )

static

Add pieces to an email header, wrapping where necessary.

Parameters

fp	File to write to
pfx	Prefix for headers
value	Text to be added
chflags	Flags, see CopyHeaderFlags
col	Column that this text starts at

Return values

0	Success
-1	Failure

Definition at line 82 of file header.c.

{
  while (value && (value[0] != '\0'))
  {
    if (fputc(*value, fp) == EOF)
      return -1;
    /* corner-case: break words longer than 998 chars by force,
     * mandated by RFC5322 */
    if (!(chflags & CH_DISPLAY) && (++col >= 998))
    {
      if (fputs("\n ", fp) < 0)
        return -1;
      col = 1;
    }
    if (*value == '\n')
    {
      if ((value[1] != '\0') && pfx && (pfx[0] != '\0') && (fputs(pfx, fp) == EOF))
        return -1;
      /* for display, turn folding spaces into folding tabs */
      if ((chflags & CH_DISPLAY) && ((value[1] == ' ') || (value[1] == '\t')))
      {
        value++;
        while ((value[0] != '\0') && ((value[0] == ' ') || (value[0] == '\t')))
          value++;
        if (fputc('\t', fp) == EOF)
          return -1;
        continue;
      }
    }
    value++;
  }
  return 0;
}

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fold_one_header()

static int fold_one_header ( FILE *  fp, const char *  tag, const char *  value, size_t  vlen, const char *  pfx, int  wraplen, CopyHeaderFlags  chflags  )

static

Fold one header line.

Parameters

fp	File to write to
tag	Header key, e.g. "From"
value	Header value
vlen	Length of the header value string
pfx	Prefix for header
wraplen	Column to wrap at
chflags	Flags, see CopyHeaderFlags

Return values

0	Success
-1	Failure

Definition at line 129 of file header.c.

{
  if (!value || (*value == '\0') || !vlen)
    return 0;
 
  const char *p = value;
  char buf[8192] = { 0 };
  int first = 1, col = 0, l = 0;
  const bool display = (chflags & CH_DISPLAY);
 
  mutt_debug(LL_DEBUG5, "pfx=[%s], tag=[%s], flags=%d value=[%.*s]\n", pfx, tag,
             chflags, (int) ((value[vlen - 1] == '\n') ? vlen - 1 : vlen), value);
 
  if (tag && *tag && (fprintf(fp, "%s%s: ", NONULL(pfx), tag) < 0))
    return -1;
  col = mutt_str_len(tag) + ((tag && (tag[0] != '\0')) ? 2 : 0) + mutt_str_len(pfx);
 
  while (p && (p[0] != '\0'))
  {
    int fold = 0;
 
    /* find the next word and place it in 'buf'. it may start with
     * whitespace we can fold before */
    const char *next = mutt_str_find_word(p);
    l = MIN(sizeof(buf) - 1, next - p);
    memcpy(buf, p, l);
    buf[l] = '\0';
 
    /* determine width: character cells for display, bytes for sending
     * (we get pure ascii only) */
    const int w = mutt_mb_width(buf, col, display);
    const int enc = mutt_str_startswith(buf, "=?");
 
    mutt_debug(LL_DEBUG5, "word=[%s], col=%d, w=%d, next=[0x0%x]\n",
               (buf[0] == '\n' ? "\\n" : buf), col, w, *next);
 
    /* insert a folding \n before the current word's lwsp except for
     * header name, first word on a line (word longer than wrap width)
     * and encoded words */
    if (!first && !enc && col && ((col + w) >= wraplen))
    {
      col = mutt_str_len(pfx);
      fold = 1;
      if (fprintf(fp, "\n%s", NONULL(pfx)) <= 0)
        return -1;
    }
 
    /* print the actual word; for display, ignore leading ws for word
     * and fold with tab for readability */
    if (display && fold)
    {
      char *pc = buf;
      while ((pc[0] != '\0') && ((pc[0] == ' ') || (pc[0] == '\t')))
      {
        pc++;
        col--;
      }
      if (fputc('\t', fp) == EOF)
        return -1;
      if (print_val(fp, pfx, pc, chflags, col) < 0)
        return -1;
      col += 8;
    }
    else if (print_val(fp, pfx, buf, chflags, col) < 0)
    {
      return -1;
    }
    col += w;
 
    /* if the current word ends in \n, ignore all its trailing spaces
     * and reset column; this prevents us from putting only spaces (or
     * even none) on a line if the trailing spaces are located at our
     * current line width
     * XXX this covers ASCII space only, for display we probably
     * want something like iswspace() here */
    const char *sp = next;
    while ((sp[0] != '\0') && ((sp[0] == ' ') || (sp[0] == '\t')))
      sp++;
    if (sp[0] == '\n')
    {
      if (sp[1] == '\0')
        break;
      next = sp;
      col = 0;
    }
 
    p = next;
    first = 0;
  }
 
  /* if we have printed something but didn't \n-terminate it, do it
   * except the last word we printed ended in \n already */
  if (col && ((l == 0) || (buf[l - 1] != '\n')))
    if (putc('\n', fp) == EOF)
      return -1;
 
  return 0;
}

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unfold_header()

static char * unfold_header ( char *  s )

static

Unfold a wrapped email header.

Parameters

s	String to process

Return values

ptr	Unfolded string

Note

The string is altered in-place

Definition at line 236 of file header.c.

{
  char *p = s;
  char *q = s;
 
  while (p && (p[0] != '\0'))
  {
    /* remove CRLF prior to FWSP, turn \t into ' ' */
    if ((p[0] == '\r') && (p[1] == '\n') && ((p[2] == ' ') || (p[2] == '\t')))
    {
      *q++ = ' ';
      p += 3;
      continue;
    }
    else if ((p[0] == '\n') && ((p[1] == ' ') || (p[1] == '\t')))
    {
      /* remove LF prior to FWSP, turn \t into ' ' */
      *q++ = ' ';
      p += 2;
      continue;
    }
    *q++ = *p++;
  }
  if (q)
    q[0] = '\0';
 
  return s;
}

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userhdrs_override_cmp()

static int userhdrs_override_cmp ( const void *  a, const void *  b  )

static

Compare a user-defined header with an element of the UserhdrsOverrideHeaders list.

Parameters

a	Pointer to the string containing the user-defined header
b	Pointer to an element of the UserhdrsOverrideHeaders list

Return values

-1	a precedes b
0	a and b are identical
1	b precedes a

Definition at line 273 of file header.c.

{
  const char *ca = a;
  const char *cb = *(const char **) b;
  return mutt_istrn_cmp(ca, cb, strlen(cb));
}

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write_one_header()

static int write_one_header ( FILE *  fp, int  pfxw, int  max, int  wraplen, const char *  pfx, const char *  start, const char *  end, CopyHeaderFlags  chflags  )

static

Write out one header line.

Parameters

fp	File to write to
pfxw	Width of prefix string
max	Max width
wraplen	Column to wrap at
pfx	Prefix for header
start	Start of header line
end	End of header line
chflags	Flags, see CopyHeaderFlags

Return values

0	Success
-1	Failure

Definition at line 293 of file header.c.

{
  const char *t = strchr(start, ':');
  if (!t || (t >= end))
  {
    mutt_debug(LL_DEBUG1, "#2 warning: header not in 'key: value' format!\n");
    return 0;
  }
 
  const size_t vallen = end - start;
  const bool short_enough = (pfxw + max <= wraplen);
 
  mutt_debug((short_enough ? LL_DEBUG2 : LL_DEBUG5), "buf[%s%.*s] %s, max width = %d %s %d\n",
             NONULL(pfx), (int) (vallen - 1) /* skip newline */, start,
             (short_enough ? "short enough" : "too long"), max,
             (short_enough ? "<=" : ">"), wraplen);
 
  int rc = 0;
  const char *valbuf = NULL, *tagbuf = NULL;
  const bool is_from = (vallen > 5) && mutt_istr_startswith(start, "from ");
 
  /* only pass through folding machinery if necessary for sending,
   * never wrap From_ headers on sending */
  if (!(chflags & CH_DISPLAY) && (short_enough || is_from))
  {
    if (pfx && *pfx)
    {
      if (fputs(pfx, fp) == EOF)
      {
        return -1;
      }
    }
 
    valbuf = mutt_strn_dup(start, end - start);
    rc = print_val(fp, pfx, valbuf, chflags, mutt_str_len(pfx));
  }
  else
  {
    if (!is_from)
    {
      tagbuf = mutt_strn_dup(start, t - start);
      /* skip over the colon separating the header field name and value */
      t++;
 
      /* skip over any leading whitespace (WSP, as defined in RFC5322)
       * NOTE: mutt_str_skip_email_wsp() does the wrong thing here.
       *       See tickets 3609 and 3716. */
      while ((*t == ' ') || (*t == '\t'))
        t++;
    }
    const char *s = is_from ? start : t;
    valbuf = mutt_strn_dup(s, end - s);
    rc = fold_one_header(fp, tagbuf, valbuf, end - s, pfx, wraplen, chflags);
  }
 
  FREE(&tagbuf);
  FREE(&valbuf);
  return rc;
}

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write_userhdrs()

static struct UserHdrsOverride write_userhdrs ( FILE *  fp, const struct ListHead *  userhdrs, bool  privacy, struct ConfigSubset *  sub  )

static

Write user-defined headers and keep track of the interesting ones.

Parameters

fp	FILE pointer where to write the headers
userhdrs	List of headers to write
privacy	Omit headers that could identify the user
sub	Config Subset

Return values

obj	UserHdrsOverride struct containing a bitmask of which unique headers were written

Definition at line 362 of file header.c.

{
  struct UserHdrsOverride overrides = { { 0 } };
 
  struct ListNode *tmp = NULL;
  STAILQ_FOREACH(tmp, userhdrs, entries)
  {
    char *const colon = strchr(NONULL(tmp->data), ':');
    if (!colon)
    {
      continue;
    }
 
    const char *const value = mutt_str_skip_email_wsp(colon + 1);
    if (*value == '\0')
    {
      continue; /* don't emit empty fields. */
    }
 
    /* check whether the current user-header is an override */
    size_t cur_override = ICONV_ILLEGAL_SEQ;
    const char *const *idx = bsearch(tmp->data, UserhdrsOverrideHeaders,
                                     mutt_array_size(UserhdrsOverrideHeaders),
                                     sizeof(char *), userhdrs_override_cmp);
    if (idx)
    {
      cur_override = idx - UserhdrsOverrideHeaders;
      overrides.is_overridden[cur_override] = true;
    }
 
    if (privacy && (cur_override == USERHDRS_OVERRIDE_USER_AGENT))
    {
      continue;
    }
 
    *colon = '\0';
    mutt_write_one_header(fp, tmp->data, value, NULL, 0, CH_NO_FLAGS, sub);
    *colon = ':';
  }
 
  return overrides;
}

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mutt_write_one_header()

int mutt_write_one_header	(	FILE *	fp,
		const char *	tag,
		const char *	value,
		const char *	pfx,
		int	wraplen,
		CopyHeaderFlags	chflags,
		struct ConfigSubset *	sub
	)

Write one header line to a file.

Parameters

fp	File to write to
tag	Header key, e.g. "From"
value	Header value
pfx	Prefix for header
wraplen	Column to wrap at
chflags	Flags, see CopyHeaderFlags
sub	Config Subset

Return values

0	Success
-1	Failure

split several headers into individual ones and call write_one_header for each one

Definition at line 421 of file header.c.

{
  char *last = NULL, *line = NULL;
  int max = 0, w, rc = -1;
  int pfxw = mutt_strwidth(pfx);
  char *v = mutt_str_dup(value);
  bool display = (chflags & CH_DISPLAY);
 
  const bool c_weed = cs_subset_bool(sub, "weed");
  if (!display || c_weed)
    v = unfold_header(v);
 
  /* when not displaying, use sane wrap value */
  if (!display)
  {
    const short c_wrap_headers = cs_subset_number(sub, "wrap_headers");
    if ((c_wrap_headers < 78) || (c_wrap_headers > 998))
      wraplen = 78;
    else
      wraplen = c_wrap_headers;
  }
  else if (wraplen <= 0)
  {
    wraplen = 78;
  }
 
  const size_t vlen = mutt_str_len(v);
  if (tag)
  {
    /* if header is short enough, simply print it */
    if (!display && (mutt_strwidth(tag) + 2 + pfxw + mutt_strnwidth(v, vlen) <= wraplen))
    {
      mutt_debug(LL_DEBUG5, "buf[%s%s: %s] is short enough\n", NONULL(pfx), tag, v);
      if (fprintf(fp, "%s%s: %s\n", NONULL(pfx), tag, v) <= 0)
        goto out;
      rc = 0;
      goto out;
    }
    else
    {
      rc = fold_one_header(fp, tag, v, vlen, pfx, wraplen, chflags);
      goto out;
    }
  }
 
  char *p = v;
  last = v;
  line = v;
  while (p && *p)
  {
    p = strchr(p, '\n');
 
    /* find maximum line width in current header */
    if (p)
      *p = '\0';
    w = mutt_mb_width(line, 0, display);
    if (w > max)
      max = w;
    if (p)
      *p = '\n';
 
    if (!p)
      break;
 
    line = ++p;
    if ((*p != ' ') && (*p != '\t'))
    {
      if (write_one_header(fp, pfxw, max, wraplen, pfx, last, p, chflags) < 0)
        goto out;
      last = p;
      max = 0;
    }
  }
 
  if (last && *last)
    if (write_one_header(fp, pfxw, max, wraplen, pfx, last, p, chflags) < 0)
      goto out;
 
  rc = 0;
 
out:
  FREE(&v);
  return rc;
}

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mutt_write_references()

void mutt_write_references	(	const struct ListHead *	r,
		FILE *	fp,
		size_t	trim
	)

Add the message references to a list.

Parameters

r	String List of references
fp	File to write to
trim	Trim the list to at most this many items

Write the list in reverse because they are stored in reverse order when parsed to speed up threading.

Definition at line 517 of file header.c.

{
  struct ListNode *np = NULL;
  size_t length = 0;
 
  STAILQ_FOREACH(np, r, entries)
  {
    if (++length == trim)
      break;
  }
 
  struct ListNode **ref = mutt_mem_calloc(length, sizeof(struct ListNode *));
 
  // store in reverse order
  size_t tmp = length;
  STAILQ_FOREACH(np, r, entries)
  {
    ref[--tmp] = np;
    if (tmp == 0)
      break;
  }
 
  for (size_t i = 0; i < length; i++)
  {
    fputc(' ', fp);
    fputs(ref[i]->data, fp);
    if (i != length - 1)
      fputc('\n', fp);
  }
 
  FREE(&ref);
}

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mutt_rfc822_write_header()

int mutt_rfc822_write_header	(	FILE *	fp,
		struct Envelope *	env,
		struct Body *	attach,
		enum MuttWriteHeaderMode	mode,
		bool	privacy,
		bool	hide_protected_subject,
		struct ConfigSubset *	sub
	)

Write out one RFC822 header line.

Parameters

fp	File to write to
env	Envelope of email
attach	Attachment
mode	Mode, see MuttWriteHeaderMode
privacy	If true, remove headers that might identify the user
hide_protected_subject	If true, replace subject header
sub	Config Subset

Return values

0	Success
-1	Failure

Note

All RFC2047 encoding should be done outside of this routine, except for the "real name." This will allow this routine to be used more than once, if necessary.

Likewise, all IDN processing should happen outside of this routine.

privacy true => will omit any headers which may identify the user. Output generated is suitable for being sent through anonymous remailer chains.

hide_protected_subject: replaces the Subject header with $crypt_protected_headers_subject in NORMAL or POSTPONE mode.

Definition at line 575 of file header.c.

{
  if (((mode == MUTT_WRITE_HEADER_NORMAL) || (mode == MUTT_WRITE_HEADER_FCC) ||
       (mode == MUTT_WRITE_HEADER_POSTPONE)) &&
      !privacy)
  {
    struct Buffer *date = buf_pool_get();
    mutt_date_make_date(date, cs_subset_bool(sub, "local_date_header"));
    fprintf(fp, "Date: %s\n", buf_string(date));
    buf_pool_release(&date);
  }
 
  /* UseFrom is not consulted here so that we can still write a From:
   * field if the user sets it with the 'my_hdr' command */
  if (!TAILQ_EMPTY(&env->from) && !privacy)
  {
    mutt_addrlist_write_file(&env->from, fp, "From");
  }
 
  if (!TAILQ_EMPTY(&env->sender) && !privacy)
  {
    mutt_addrlist_write_file(&env->sender, fp, "Sender");
  }
 
  if (!TAILQ_EMPTY(&env->to))
  {
    mutt_addrlist_write_file(&env->to, fp, "To");
  }
  else if (mode == MUTT_WRITE_HEADER_EDITHDRS)
#ifdef USE_NNTP
    if (!OptNewsSend)
#endif
      fputs("To:\n", fp);
 
  if (!TAILQ_EMPTY(&env->cc))
  {
    mutt_addrlist_write_file(&env->cc, fp, "Cc");
  }
  else if (mode == MUTT_WRITE_HEADER_EDITHDRS)
#ifdef USE_NNTP
    if (!OptNewsSend)
#endif
      fputs("Cc:\n", fp);
 
  if (!TAILQ_EMPTY(&env->bcc))
  {
    const bool c_write_bcc = cs_subset_bool(sub, "write_bcc");
 
    if ((mode == MUTT_WRITE_HEADER_POSTPONE) ||
        (mode == MUTT_WRITE_HEADER_EDITHDRS) || (mode == MUTT_WRITE_HEADER_FCC) ||
        ((mode == MUTT_WRITE_HEADER_NORMAL) && c_write_bcc))
    {
      mutt_addrlist_write_file(&env->bcc, fp, "Bcc");
    }
  }
  else if (mode == MUTT_WRITE_HEADER_EDITHDRS)
#ifdef USE_NNTP
    if (!OptNewsSend)
#endif
      fputs("Bcc:\n", fp);
 
#ifdef USE_NNTP
  if (env->newsgroups)
    fprintf(fp, "Newsgroups: %s\n", env->newsgroups);
  else if ((mode == MUTT_WRITE_HEADER_EDITHDRS) && OptNewsSend)
    fputs("Newsgroups:\n", fp);
 
  if (env->followup_to)
    fprintf(fp, "Followup-To: %s\n", env->followup_to);
  else if ((mode == MUTT_WRITE_HEADER_EDITHDRS) && OptNewsSend)
    fputs("Followup-To:\n", fp);
 
  const bool c_x_comment_to = cs_subset_bool(sub, "x_comment_to");
  if (env->x_comment_to)
    fprintf(fp, "X-Comment-To: %s\n", env->x_comment_to);
  else if ((mode == MUTT_WRITE_HEADER_EDITHDRS) && OptNewsSend && c_x_comment_to)
    fputs("X-Comment-To:\n", fp);
#endif
 
  if (env->subject)
  {
    if (hide_protected_subject &&
        ((mode == MUTT_WRITE_HEADER_NORMAL) || (mode == MUTT_WRITE_HEADER_FCC) ||
         (mode == MUTT_WRITE_HEADER_POSTPONE)))
    {
      const char *const c_crypt_protected_headers_subject = cs_subset_string(sub, "crypt_protected_headers_subject");
      mutt_write_one_header(fp, "Subject", c_crypt_protected_headers_subject,
                            NULL, 0, CH_NO_FLAGS, sub);
    }
    else
    {
      mutt_write_one_header(fp, "Subject", env->subject, NULL, 0, CH_NO_FLAGS, sub);
    }
  }
  else if (mode == MUTT_WRITE_HEADER_EDITHDRS)
  {
    fputs("Subject:\n", fp);
  }
 
  /* save message id if the user has set it */
  if (env->message_id && !privacy)
    fprintf(fp, "Message-ID: %s\n", env->message_id);
 
  if (!TAILQ_EMPTY(&env->reply_to))
  {
    mutt_addrlist_write_file(&env->reply_to, fp, "Reply-To");
  }
  else if (mode == MUTT_WRITE_HEADER_EDITHDRS)
  {
    fputs("Reply-To:\n", fp);
  }
 
  if (!TAILQ_EMPTY(&env->mail_followup_to))
  {
#ifdef USE_NNTP
    if (!OptNewsSend)
#endif
    {
      mutt_addrlist_write_file(&env->mail_followup_to, fp, "Mail-Followup-To");
    }
  }
 
  /* Add any user defined headers */
  struct UserHdrsOverride userhdrs_overrides = write_userhdrs(fp, &env->userhdrs,
                                                              privacy, sub);
 
  if ((mode == MUTT_WRITE_HEADER_NORMAL) || (mode == MUTT_WRITE_HEADER_FCC) ||
      (mode == MUTT_WRITE_HEADER_POSTPONE) || (mode == MUTT_WRITE_HEADER_MIME))
  {
    if (!STAILQ_EMPTY(&env->references))
    {
      fputs("References:", fp);
      mutt_write_references(&env->references, fp, 10);
      fputc('\n', fp);
    }
 
    /* Add the MIME headers */
    if (!userhdrs_overrides.is_overridden[USERHDRS_OVERRIDE_CONTENT_TYPE])
    {
      fputs("MIME-Version: 1.0\n", fp);
      mutt_write_mime_header(attach, fp, sub);
    }
  }
 
  if (!STAILQ_EMPTY(&env->in_reply_to))
  {
    fputs("In-Reply-To:", fp);
    mutt_write_references(&env->in_reply_to, fp, 0);
    fputc('\n', fp);
  }
 
#ifdef USE_AUTOCRYPT
  const bool c_autocrypt = cs_subset_bool(sub, "autocrypt");
  if (c_autocrypt)
  {
    if (mode == MUTT_WRITE_HEADER_NORMAL || mode == MUTT_WRITE_HEADER_FCC)
      mutt_autocrypt_write_autocrypt_header(env, fp);
    if (mode == MUTT_WRITE_HEADER_MIME)
      mutt_autocrypt_write_gossip_headers(env, fp);
  }
#endif
 
  const bool c_user_agent = cs_subset_bool(sub, "user_agent");
  if (((mode == MUTT_WRITE_HEADER_NORMAL) || (mode == MUTT_WRITE_HEADER_FCC)) && !privacy &&
      c_user_agent && !userhdrs_overrides.is_overridden[USERHDRS_OVERRIDE_USER_AGENT])
  {
    /* Add a vanity header */
    fprintf(fp, "User-Agent: NeoMutt/%s%s\n", PACKAGE_VERSION, GitVer);
  }
 
  return (ferror(fp) == 0) ? 0 : -1;
}

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mutt_write_mime_header()

int mutt_write_mime_header	(	struct Body *	a,
		FILE *	fp,
		struct ConfigSubset *	sub
	)

Create a MIME header.

Parameters

a	Body part
fp	File to write to
sub	Config Subset

Return values

0	Success
-1	Failure

Definition at line 758 of file header.c.

{
  if (!a || !fp)
    return -1;
 
  int len;
  int tmplen;
  char buf[256] = { 0 };
 
  char *id = NULL;
 
  fprintf(fp, "Content-Type: %s/%s", TYPE(a), a->subtype);
 
  if (!TAILQ_EMPTY(&a->parameter))
  {
    len = 25 + mutt_str_len(a->subtype); /* approximate len. of content-type */
 
    struct Parameter *np = NULL;
    TAILQ_FOREACH(np, &a->parameter, entries)
    {
      if (!np->attribute || !np->value)
        continue;
 
      struct ParameterList pl_conts = TAILQ_HEAD_INITIALIZER(pl_conts);
      rfc2231_encode_string(&pl_conts, np->attribute, np->value);
      struct Parameter *cont = NULL;
      TAILQ_FOREACH(cont, &pl_conts, entries)
      {
        if (mutt_istr_equal(cont->attribute, "content-id"))
        {
          // Content-ID: gets its own header
          mutt_str_replace(&id, cont->value);
          break;
        }
 
        fputc(';', fp);
 
        buf[0] = 0;
        mutt_addr_cat(buf, sizeof(buf), cont->value, MimeSpecials);
 
        /* Dirty hack to make messages readable by Outlook Express
         * for the Mac: force quotes around the boundary parameter
         * even when they aren't needed.  */
        if (mutt_istr_equal(cont->attribute, "boundary") && mutt_str_equal(buf, cont->value))
          snprintf(buf, sizeof(buf), "\"%s\"", cont->value);
 
        tmplen = mutt_str_len(buf) + mutt_str_len(cont->attribute) + 1;
        if ((len + tmplen + 2) > 76)
        {
          fputs("\n\t", fp);
          len = tmplen + 1;
        }
        else
        {
          fputc(' ', fp);
          len += tmplen + 1;
        }
 
        fprintf(fp, "%s=%s", cont->attribute, buf);
      }
 
      mutt_param_free(&pl_conts);
    }
  }
 
  fputc('\n', fp);
 
  if (id)
  {
    fprintf(fp, "Content-ID: <%s>\n", id);
    mutt_mem_free(&id);
  }
 
  if (a->language)
    fprintf(fp, "Content-Language: %s\n", a->language);
 
  if (a->description)
    fprintf(fp, "Content-Description: %s\n", a->description);
 
  if (a->disposition != DISP_NONE)
  {
    const char *dispstr[] = { "inline", "attachment", "form-data" };
 
    if (a->disposition < sizeof(dispstr) / sizeof(char *))
    {
      fprintf(fp, "Content-Disposition: %s", dispstr[a->disposition]);
      len = 21 + mutt_str_len(dispstr[a->disposition]);
 
      if (a->use_disp && ((a->disposition != DISP_INLINE) || a->d_filename))
      {
        char *fn = a->d_filename;
        if (!fn)
          fn = a->filename;
 
        if (fn)
        {
          /* Strip off the leading path... */
          char *t = strrchr(fn, '/');
          if (t)
            t++;
          else
            t = fn;
 
          struct ParameterList pl_conts = TAILQ_HEAD_INITIALIZER(pl_conts);
          rfc2231_encode_string(&pl_conts, "filename", t);
          struct Parameter *cont = NULL;
          TAILQ_FOREACH(cont, &pl_conts, entries)
          {
            fputc(';', fp);
            buf[0] = 0;
            mutt_addr_cat(buf, sizeof(buf), cont->value, MimeSpecials);
 
            tmplen = mutt_str_len(buf) + mutt_str_len(cont->attribute) + 1;
            if ((len + tmplen + 2) > 76)
            {
              fputs("\n\t", fp);
              len = tmplen + 1;
            }
            else
            {
              fputc(' ', fp);
              len += tmplen + 1;
            }
 
            fprintf(fp, "%s=%s", cont->attribute, buf);
          }
 
          mutt_param_free(&pl_conts);
        }
      }
 
      fputc('\n', fp);
    }
    else
    {
      mutt_debug(LL_DEBUG1, "ERROR: invalid content-disposition %d\n", a->disposition);
    }
  }
 
  if (a->encoding != ENC_7BIT)
    fprintf(fp, "Content-Transfer-Encoding: %s\n", ENCODING(a->encoding));
 
  const bool c_crypt_protected_headers_write = cs_subset_bool(sub, "crypt_protected_headers_write");
  bool c_autocrypt = false;
#ifdef USE_AUTOCRYPT
  c_autocrypt = cs_subset_bool(sub, "autocrypt");
#endif
 
  if ((c_crypt_protected_headers_write || c_autocrypt) && a->mime_headers)
  {
    mutt_rfc822_write_header(fp, a->mime_headers, NULL, MUTT_WRITE_HEADER_MIME,
                             false, false, sub);
  }
 
  /* Do NOT add the terminator here!!! */
  return ferror(fp) ? -1 : 0;
}

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Variable Documentation

UserhdrsOverrideHeaders

const char* const UserhdrsOverrideHeaders[]

static

Initial value:

= {
  "content-type:",
  "user-agent:",
}

The next array/enum pair is used to to keep track of user headers that override pre-defined headers NeoMutt would emit.

Keep the array sorted and in sync with the enum.

Definition at line 49 of file header.c.