sendlib.c File Reference

Miscellaneous functions for sending an email. More...

#include "config.h"
#include <inttypes.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "mutt/lib.h"
#include "address/lib.h"
#include "config/lib.h"
#include "email/lib.h"
#include "core/lib.h"
#include "mutt.h"
#include "sendlib.h"
#include "lib.h"
#include "attach/lib.h"
#include "convert/lib.h"
#include "ncrypt/lib.h"
#include "copy.h"
#include "globals.h"
#include "handler.h"
#include "mutt_mailbox.h"
#include "muttlib.h"
#include "mx.h"

Include dependency graph for sendlib.c:

Go to the source code of this file.

Functions
enum ContentType	mutt_lookup_mime_type (struct Body *att, const char *path)
	Find the MIME type for an attachment. More...
static void	transform_to_7bit (struct Body *a, FILE *fp_in, struct ConfigSubset *sub)
	Convert MIME parts to 7-bit. More...
void	mutt_message_to_7bit (struct Body *a, FILE *fp, struct ConfigSubset *sub)
	Convert an email's MIME parts to 7-bit. More...
static void	set_encoding (struct Body *b, struct Content *info, struct ConfigSubset *sub)
	Determine which Content-Transfer-Encoding to use. More...
void	mutt_stamp_attachment (struct Body *a)
	Timestamp an Attachment. More...
void	mutt_update_encoding (struct Body *a, struct ConfigSubset *sub)
	Update the encoding type. More...
struct Body *	mutt_make_message_attach (struct Mailbox *m, struct Email *e, bool attach_msg, struct ConfigSubset *sub)
	Create a message attachment. More...
static void	run_mime_type_query (struct Body *att, struct ConfigSubset *sub)
	Run an external command to determine the MIME type. More...
struct Body *	mutt_make_file_attach (const char *path, struct ConfigSubset *sub)
	Create a file attachment. More...
static void	encode_headers (struct ListHead *h, struct ConfigSubset *sub)
	RFC2047-encode a list of headers. More...
const char *	mutt_fqdn (bool may_hide_host, const struct ConfigSubset *sub)
	Get the Fully-Qualified Domain Name. More...
static char *	gen_msgid (void)
	Generate a random Message ID. More...
void	mutt_prepare_envelope (struct Envelope *env, bool final, struct ConfigSubset *sub)
	Prepare an email header. More...
void	mutt_unprepare_envelope (struct Envelope *env)
	Undo the encodings of mutt_prepare_envelope() More...
static int	bounce_message (FILE *fp, struct Mailbox *m, struct Email *e, struct AddressList *to, const char *resent_from, struct AddressList *env_from, struct ConfigSubset *sub)
	Bounce an email message. More...
int	mutt_bounce_message (FILE *fp, struct Mailbox *m, struct Email *e, struct AddressList *to, struct ConfigSubset *sub)
	Bounce an email message. More...
static void	set_noconv_flags (struct Body *b, bool flag)
	Set/reset the "x-mutt-noconv" flag. More...
int	mutt_write_multiple_fcc (const char *path, struct Email *e, const char *msgid, bool post, char *fcc, char **finalpath, struct ConfigSubset *sub)
	Handle FCC with multiple, comma separated entries. More...
int	mutt_write_fcc (const char *path, struct Email *e, const char *msgid, bool post, const char *fcc, char **finalpath, struct ConfigSubset *sub)
	Write email to FCC mailbox. More...

Detailed Description

Miscellaneous functions for sending an email.

Authors

• Michael R. Elkins
• Pietro Cerutti
• R Primus

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 sendlib.c.

Function Documentation

mutt_lookup_mime_type()

enum ContentType mutt_lookup_mime_type	(	struct Body *	att,
		const char *	path
	)

Find the MIME type for an attachment.

Parameters

att	Email with attachment
path	Path to attachment

Return values

num	MIME type, e.g. TYPE_IMAGE

Given a file at 'path', see if there is a registered MIME type. Returns the major MIME type, and copies the subtype to "d". First look in a system mime.types if we can find one, then look for ~/.mime.types. The longest match is used so that we can match 'ps.gz' when 'gz' also exists.

Definition at line 69 of file sendlib.c.

{
  FILE *fp = NULL;
  char *p = NULL, *q = NULL, *ct = NULL;
  char buf[PATH_MAX] = { 0 };
  char subtype[256] = { 0 };
  char xtype[256] = { 0 };
  int sze, cur_sze = 0;
  bool found_mimetypes = false;
  enum ContentType type = TYPE_OTHER;
 
  int szf = mutt_str_len(path);
 
  for (int count = 0; count < 4; count++)
  {
    /* can't use strtok() because we use it in an inner loop below, so use
     * a switch statement here instead.  */
    switch (count)
    {
      /* last file with last entry to match wins type/xtype */
      case 0:
        /* check default unix mimetypes location first */
        mutt_str_copy(buf, "/etc/mime.types", sizeof(buf));
        break;
      case 1:
        mutt_str_copy(buf, SYSCONFDIR "/mime.types", sizeof(buf));
        break;
      case 2:
        mutt_str_copy(buf, PKGDATADIR "/mime.types", sizeof(buf));
        break;
      case 3:
        snprintf(buf, sizeof(buf), "%s/.mime.types", NONULL(HomeDir));
        break;
      default:
        mutt_debug(LL_DEBUG1, "Internal error, count = %d\n", count);
        goto bye; /* shouldn't happen */
    }
 
    fp = fopen(buf, "r");
    if (fp)
    {
      found_mimetypes = true;
 
      while (fgets(buf, sizeof(buf) - 1, fp))
      {
        /* weed out any comments */
        p = strchr(buf, '#');
        if (p)
          *p = '\0';
 
        /* remove any leading space. */
        ct = buf;
        SKIPWS(ct);
 
        /* position on the next field in this line */
        p = strpbrk(ct, " \t");
        if (!p)
          continue;
        *p++ = 0;
        SKIPWS(p);
 
        /* cycle through the file extensions */
        while ((p = strtok(p, " \t\n")))
        {
          sze = mutt_str_len(p);
          if ((sze > cur_sze) && (szf >= sze) && mutt_istr_equal(path + szf - sze, p) &&
              ((szf == sze) || (path[szf - sze - 1] == '.')))
          {
            /* get the content-type */
 
            p = strchr(ct, '/');
            if (!p)
            {
              /* malformed line, just skip it. */
              break;
            }
            *p++ = 0;
 
            for (q = p; *q && !IS_SPACE(*q); q++)
              ; // do nothing
 
            mutt_strn_copy(subtype, p, q - p, sizeof(subtype));
 
            type = mutt_check_mime_type(ct);
            if (type == TYPE_OTHER)
              mutt_str_copy(xtype, ct, sizeof(xtype));
 
            cur_sze = sze;
          }
          p = NULL;
        }
      }
      mutt_file_fclose(&fp);
    }
  }
 
bye:
 
  /* no mime.types file found */
  if (!found_mimetypes)
  {
    mutt_error(_("Could not find any mime.types file"));
  }
 
  if ((type != TYPE_OTHER) || (*xtype != '\0'))
  {
    att->type = type;
    mutt_str_replace(&att->subtype, subtype);
    mutt_str_replace(&att->xtype, xtype);
  }
 
  return type;
}

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transform_to_7bit()

static void transform_to_7bit ( struct Body *  a, FILE *  fp_in, struct ConfigSubset *  sub  )

static

Convert MIME parts to 7-bit.

Parameters

a	Body of the email
fp_in	File to read
sub	Config Subset

Definition at line 189 of file sendlib.c.

{
  struct Buffer *buf = NULL;
  struct State state = { 0 };
  struct stat st = { 0 };
 
  for (; a; a = a->next)
  {
    if (a->type == TYPE_MULTIPART)
    {
      a->encoding = ENC_7BIT;
      transform_to_7bit(a->parts, fp_in, sub);
    }
    else if (mutt_is_message_type(a->type, a->subtype))
    {
      mutt_message_to_7bit(a, fp_in, sub);
    }
    else
    {
      a->noconv = true;
      a->force_charset = true;
 
      /* Because of the potential recursion in message types, we
       * restrict the lifetime of the buffer tightly */
      buf = mutt_buffer_pool_get();
      mutt_buffer_mktemp(buf);
      state.fp_out = mutt_file_fopen(mutt_buffer_string(buf), "w");
      if (!state.fp_out)
      {
        mutt_perror("fopen");
        mutt_buffer_pool_release(&buf);
        return;
      }
      state.fp_in = fp_in;
      mutt_decode_attachment(a, &state);
      mutt_file_fclose(&state.fp_out);
      FREE(&a->d_filename);
      a->d_filename = a->filename;
      a->filename = mutt_buffer_strdup(buf);
      mutt_buffer_pool_release(&buf);
      a->unlink = true;
      if (stat(a->filename, &st) == -1)
      {
        mutt_perror("stat");
        return;
      }
      a->length = st.st_size;
 
      mutt_update_encoding(a, sub);
      if (a->encoding == ENC_8BIT)
        a->encoding = ENC_QUOTED_PRINTABLE;
      else if (a->encoding == ENC_BINARY)
        a->encoding = ENC_BASE64;
    }
  }
}

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mutt_message_to_7bit()

void mutt_message_to_7bit	(	struct Body *	a,
		FILE *	fp,
		struct ConfigSubset *	sub
	)

Convert an email's MIME parts to 7-bit.

Parameters

a	Body of the email
fp	File to read (OPTIONAL)
sub	Config Subset

Definition at line 252 of file sendlib.c.

{
  struct Buffer temp = mutt_buffer_make(0);
  FILE *fp_in = NULL;
  FILE *fp_out = NULL;
  struct stat st = { 0 };
 
  if (!a->filename && fp)
  {
    fp_in = fp;
  }
  else if (!a->filename || !(fp_in = fopen(a->filename, "r")))
  {
    mutt_error(_("Could not open %s"), a->filename ? a->filename : "(null)");
    return;
  }
  else
  {
    a->offset = 0;
    if (stat(a->filename, &st) == -1)
    {
      mutt_perror("stat");
      mutt_file_fclose(&fp_in);
      goto cleanup;
    }
    a->length = st.st_size;
  }
 
  /* Avoid buffer pool due to recursion */
  mutt_buffer_mktemp(&temp);
  fp_out = mutt_file_fopen(mutt_buffer_string(&temp), "w+");
  if (!fp_out)
  {
    mutt_perror("fopen");
    goto cleanup;
  }
 
  if (!mutt_file_seek(fp_in, a->offset, SEEK_SET))
  {
    goto cleanup;
  }
  a->parts = mutt_rfc822_parse_message(fp_in, a);
 
  transform_to_7bit(a->parts, fp_in, sub);
 
  mutt_copy_hdr(fp_in, fp_out, a->offset, a->offset + a->length,
                CH_MIME | CH_NONEWLINE | CH_XMIT, NULL, 0);
 
  fputs("MIME-Version: 1.0\n", fp_out);
  mutt_write_mime_header(a->parts, fp_out, sub);
  fputc('\n', fp_out);
  mutt_write_mime_body(a->parts, fp_out, sub);
 
  if (fp_in != fp)
    mutt_file_fclose(&fp_in);
  mutt_file_fclose(&fp_out);
 
  a->encoding = ENC_7BIT;
  FREE(&a->d_filename);
  a->d_filename = a->filename;
  if (a->filename && a->unlink)
    unlink(a->filename);
  a->filename = mutt_buffer_strdup(&temp);
  a->unlink = true;
  if (stat(a->filename, &st) == -1)
  {
    mutt_perror("stat");
    goto cleanup;
  }
  a->length = st.st_size;
  mutt_body_free(&a->parts);
  a->email->body = NULL;
 
cleanup:
  if (fp_in && (fp_in != fp))
    mutt_file_fclose(&fp_in);
 
  if (fp_out)
  {
    mutt_file_fclose(&fp_out);
    mutt_file_unlink(mutt_buffer_string(&temp));
  }
 
  mutt_buffer_dealloc(&temp);
}

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set_encoding()

static void set_encoding ( struct Body *  b, struct Content *  info, struct ConfigSubset *  sub  )

static

Determine which Content-Transfer-Encoding to use.

Parameters

[in]	b	Body of email
[out]	info	Info about the email
[in]	sub	Config Subset

Definition at line 344 of file sendlib.c.

{
  const bool c_allow_8bit = cs_subset_bool(sub, "allow_8bit");
  if (b->type == TYPE_TEXT)
  {
    const bool c_encode_from = cs_subset_bool(sub, "encode_from");
    char send_charset[128] = { 0 };
    char *chsname = mutt_body_get_charset(b, send_charset, sizeof(send_charset));
    if ((info->lobin && !mutt_istr_startswith(chsname, "iso-2022")) ||
        (info->linemax > 990) || (info->from && c_encode_from))
    {
      b->encoding = ENC_QUOTED_PRINTABLE;
    }
    else if (info->hibin)
    {
      b->encoding = c_allow_8bit ? ENC_8BIT : ENC_QUOTED_PRINTABLE;
    }
    else
    {
      b->encoding = ENC_7BIT;
    }
  }
  else if ((b->type == TYPE_MESSAGE) || (b->type == TYPE_MULTIPART))
  {
    if (info->lobin || info->hibin)
    {
      if (c_allow_8bit && !info->lobin)
        b->encoding = ENC_8BIT;
      else
        mutt_message_to_7bit(b, NULL, sub);
    }
    else
    {
      b->encoding = ENC_7BIT;
    }
  }
  else if ((b->type == TYPE_APPLICATION) && mutt_istr_equal(b->subtype, "pgp-keys"))
  {
    b->encoding = ENC_7BIT;
  }
  else
  {
    /* Determine which encoding is smaller  */
    if (1.33 * (float) (info->lobin + info->hibin + info->ascii) <
        3.0 * (float) (info->lobin + info->hibin) + (float) info->ascii)
    {
      b->encoding = ENC_BASE64;
    }
    else
    {
      b->encoding = ENC_QUOTED_PRINTABLE;
    }
  }
}

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mutt_stamp_attachment()

void mutt_stamp_attachment

(

struct Body *

a

)

Timestamp an Attachment.

Parameters

a	Attachment

Definition at line 403 of file sendlib.c.

{
  a->stamp = mutt_date_now();
}

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mutt_update_encoding()

void mutt_update_encoding	(	struct Body *	a,
		struct ConfigSubset *	sub
	)

Update the encoding type.

Parameters

a	Body to update
sub	Config Subset

Assumes called from send mode where Body->filename points to actual file

Definition at line 415 of file sendlib.c.

{
  struct Content *info = NULL;
  char chsbuf[256] = { 0 };
 
  /* override noconv when it's us-ascii */
  if (mutt_ch_is_us_ascii(mutt_body_get_charset(a, chsbuf, sizeof(chsbuf))))
    a->noconv = false;
 
  if (!a->force_charset && !a->noconv)
    mutt_param_delete(&a->parameter, "charset");
 
  info = mutt_get_content_info(a->filename, a, sub);
  if (!info)
    return;
 
  set_encoding(a, info, sub);
  mutt_stamp_attachment(a);
 
  FREE(&a->content);
  a->content = info;
}

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mutt_make_message_attach()

struct Body * mutt_make_message_attach	(	struct Mailbox *	m,
		struct Email *	e,
		bool	attach_msg,
		struct ConfigSubset *	sub
	)

Create a message attachment.

Parameters

m	Mailbox
e	Email
attach_msg	true if attaching a message
sub	Config Subset

Return values

ptr	Newly allocated Body
NULL	Error

Definition at line 447 of file sendlib.c.

{
  struct Body *body = NULL;
  FILE *fp = NULL;
  CopyMessageFlags cmflags;
  SecurityFlags pgp = WithCrypto ? e->security : SEC_NO_FLAGS;
 
  const bool c_mime_forward_decode = cs_subset_bool(sub, "mime_forward_decode");
  const bool c_forward_decrypt = cs_subset_bool(sub, "forward_decrypt");
  if (WithCrypto)
  {
    if ((c_mime_forward_decode || c_forward_decrypt) && (e->security & SEC_ENCRYPT))
    {
      if (!crypt_valid_passphrase(e->security))
        return NULL;
    }
  }
 
  struct Buffer *buf = mutt_buffer_pool_get();
  mutt_buffer_mktemp(buf);
  fp = mutt_file_fopen(mutt_buffer_string(buf), "w+");
  if (!fp)
  {
    mutt_buffer_pool_release(&buf);
    return NULL;
  }
 
  body = mutt_body_new();
  body->type = TYPE_MESSAGE;
  body->subtype = mutt_str_dup("rfc822");
  body->filename = mutt_str_dup(mutt_buffer_string(buf));
  body->unlink = true;
  body->use_disp = false;
  body->disposition = DISP_INLINE;
  body->noconv = true;
 
  mutt_buffer_pool_release(&buf);
 
  struct Message *msg = mx_msg_open(m, e->msgno);
  if (!msg)
  {
    mutt_body_free(&body);
    mutt_file_fclose(&fp);
    return NULL;
  }
  mutt_parse_mime_message(e, msg->fp);
 
  CopyHeaderFlags chflags = CH_XMIT;
  cmflags = MUTT_CM_NO_FLAGS;
 
  /* If we are attaching a message, ignore `$mime_forward_decode` */
  if (!attach_msg && c_mime_forward_decode)
  {
    chflags |= CH_MIME | CH_TXTPLAIN;
    cmflags = MUTT_CM_DECODE | MUTT_CM_CHARCONV;
    if (WithCrypto & APPLICATION_PGP)
      pgp &= ~PGP_ENCRYPT;
    if (WithCrypto & APPLICATION_SMIME)
      pgp &= ~SMIME_ENCRYPT;
  }
  else if ((WithCrypto != 0) && c_forward_decrypt && (e->security & SEC_ENCRYPT))
  {
    if (((WithCrypto & APPLICATION_PGP) != 0) && mutt_is_multipart_encrypted(e->body))
    {
      chflags |= CH_MIME | CH_NONEWLINE;
      cmflags = MUTT_CM_DECODE_PGP;
      pgp &= ~PGP_ENCRYPT;
    }
    else if (((WithCrypto & APPLICATION_PGP) != 0) &&
             ((mutt_is_application_pgp(e->body) & PGP_ENCRYPT) == PGP_ENCRYPT))
    {
      chflags |= CH_MIME | CH_TXTPLAIN;
      cmflags = MUTT_CM_DECODE | MUTT_CM_CHARCONV;
      pgp &= ~PGP_ENCRYPT;
    }
    else if (((WithCrypto & APPLICATION_SMIME) != 0) &&
             ((mutt_is_application_smime(e->body) & SMIME_ENCRYPT) == SMIME_ENCRYPT))
    {
      chflags |= CH_MIME | CH_TXTPLAIN;
      cmflags = MUTT_CM_DECODE | MUTT_CM_CHARCONV;
      pgp &= ~SMIME_ENCRYPT;
    }
  }
 
  mutt_copy_message(fp, e, msg, cmflags, chflags, 0);
  mx_msg_close(m, &msg);
 
  fflush(fp);
  rewind(fp);
 
  body->email = email_new();
  body->email->offset = 0;
  /* we don't need the user headers here */
  body->email->env = mutt_rfc822_read_header(fp, body->email, false, false);
  if (WithCrypto)
    body->email->security = pgp;
  mutt_update_encoding(body, sub);
  body->parts = body->email->body;
 
  mutt_file_fclose(&fp);
 
  return body;
}

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run_mime_type_query()

static void run_mime_type_query ( struct Body *  att, struct ConfigSubset *  sub  )

static

Run an external command to determine the MIME type.

Parameters

att	Attachment
sub	Config Subset

The command in $mime_type_query_command is run.

Definition at line 559 of file sendlib.c.

{
  FILE *fp = NULL, *fp_err = NULL;
  char *buf = NULL;
  size_t buflen;
  pid_t pid;
  struct Buffer *cmd = mutt_buffer_pool_get();
 
  const char *const c_mime_type_query_command = cs_subset_string(sub, "mime_type_query_command");
 
  mutt_buffer_file_expand_fmt_quote(cmd, c_mime_type_query_command, att->filename);
 
  pid = filter_create(mutt_buffer_string(cmd), NULL, &fp, &fp_err);
  if (pid < 0)
  {
    mutt_error(_("Error running \"%s\""), mutt_buffer_string(cmd));
    mutt_buffer_pool_release(&cmd);
    return;
  }
  mutt_buffer_pool_release(&cmd);
 
  buf = mutt_file_read_line(buf, &buflen, fp, NULL, MUTT_RL_NO_FLAGS);
  if (buf)
  {
    if (strchr(buf, '/'))
      mutt_parse_content_type(buf, att);
    FREE(&buf);
  }
 
  mutt_file_fclose(&fp);
  mutt_file_fclose(&fp_err);
  filter_wait(pid);
}

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mutt_make_file_attach()

struct Body * mutt_make_file_attach	(	const char *	path,
		struct ConfigSubset *	sub
	)

Create a file attachment.

Parameters

path	File to attach
sub	Config Subset

Return values

ptr	Newly allocated Body
NULL	Error

Definition at line 600 of file sendlib.c.

{
  if (!path || (path[0] == '\0'))
    return NULL;
 
  struct Body *att = mutt_body_new();
  att->filename = mutt_str_dup(path);
 
  const char *const c_mime_type_query_command = cs_subset_string(sub, "mime_type_query_command");
  const bool c_mime_type_query_first = cs_subset_bool(sub, "mime_type_query_first");
 
  if (c_mime_type_query_command && c_mime_type_query_first)
    run_mime_type_query(att, sub);
 
  /* Attempt to determine the appropriate content-type based on the filename
   * suffix.  */
  if (!att->subtype)
    mutt_lookup_mime_type(att, path);
 
  if (!att->subtype && c_mime_type_query_command && !c_mime_type_query_first)
  {
    run_mime_type_query(att, sub);
  }
 
  struct Content *info = mutt_get_content_info(path, att, sub);
  if (!info)
  {
    mutt_body_free(&att);
    return NULL;
  }
 
  if (!att->subtype)
  {
    if ((info->nulbin == 0) &&
        ((info->lobin == 0) || ((info->lobin + info->hibin + info->ascii) / info->lobin >= 10)))
    {
      /* Statistically speaking, there should be more than 10% "lobin"
       * chars if this is really a binary file...  */
      att->type = TYPE_TEXT;
      att->subtype = mutt_str_dup("plain");
    }
    else
    {
      att->type = TYPE_APPLICATION;
      att->subtype = mutt_str_dup("octet-stream");
    }
  }
 
  FREE(&info);
  mutt_update_encoding(att, sub);
  return att;
}

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encode_headers()

static void encode_headers ( struct ListHead *  h, struct ConfigSubset *  sub  )

static

RFC2047-encode a list of headers.

Parameters

h	String List of headers
sub	Config Subset

The strings are encoded in-place.

Definition at line 660 of file sendlib.c.

{
  char *tmp = NULL;
  char *p = NULL;
  int i;
 
  const struct Slist *const c_send_charset = cs_subset_slist(sub, "send_charset");
 
  struct ListNode *np = NULL;
  STAILQ_FOREACH(np, h, entries)
  {
    p = strchr(np->data, ':');
    if (!p)
      continue;
 
    i = p - np->data;
    p = mutt_str_skip_email_wsp(p + 1);
    tmp = mutt_str_dup(p);
 
    if (!tmp)
      continue;
 
    rfc2047_encode(&tmp, NULL, i + 2, c_send_charset);
    mutt_mem_realloc(&np->data, i + 2 + mutt_str_len(tmp) + 1);
 
    sprintf(np->data + i + 2, "%s", tmp);
 
    FREE(&tmp);
  }
}

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mutt_fqdn()

const char * mutt_fqdn	(	bool	may_hide_host,
		const struct ConfigSubset *	sub
	)

Get the Fully-Qualified Domain Name.

Parameters

may_hide_host	If true, hide the hostname (leaving just the domain)
sub	Config Subset

Return values

ptr	string pointer into Hostname
NULL	Error, e.g no Hostname

Warning

Do not free the returned pointer

Definition at line 700 of file sendlib.c.

{
  const char *const c_hostname = cs_subset_string(sub, "hostname");
  if (!c_hostname || (c_hostname[0] == '@'))
    return NULL;
 
  const char *p = c_hostname;
 
  const bool c_hidden_host = cs_subset_bool(sub, "hidden_host");
  if (may_hide_host && c_hidden_host)
  {
    p = strchr(c_hostname, '.');
    if (p)
      p++;
 
    // sanity check: don't hide the host if the fqdn is something like example.com
    if (!p || !strchr(p, '.'))
      p = c_hostname;
  }
 
  return p;
}

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gen_msgid()

static char * gen_msgid ( void  )

static

Generate a random Message ID.

Return values

ptr	Message ID

The length of the message id is chosen such that it is maximal and fits in the recommended 78 character line length for the headers Message-ID:, References:, and In-Reply-To:, this leads to 62 available characters (excluding @ and >). Since we choose from 32 letters, we have 32^62 = 2^310 different message ids.

Examples:

Message-ID: <12345678901111111111222222222233333333334444444444@123456789011>
In-Reply-To: <12345678901111111111222222222233333333334444444444@123456789011>
References: <12345678901111111111222222222233333333334444444444@123456789011>

The distribution of the characters to left-of-@ and right-of-@ was arbitrary. The choice was made to put more into the left-id and shorten the right-id to slightly mimic a common length domain name.

Note

The caller should free the string

Definition at line 746 of file sendlib.c.

{
  const int ID_LEFT_LEN = 50;
  const int ID_RIGHT_LEN = 12;
  char rnd_id_left[ID_LEFT_LEN + 1];
  char rnd_id_right[ID_RIGHT_LEN + 1];
  char buf[128] = { 0 };
 
  mutt_rand_base32(rnd_id_left, sizeof(rnd_id_left) - 1);
  mutt_rand_base32(rnd_id_right, sizeof(rnd_id_right) - 1);
  rnd_id_left[ID_LEFT_LEN] = 0;
  rnd_id_right[ID_RIGHT_LEN] = 0;
 
  snprintf(buf, sizeof(buf), "<%s@%s>", rnd_id_left, rnd_id_right);
  return mutt_str_dup(buf);
}

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mutt_prepare_envelope()

void mutt_prepare_envelope	(	struct Envelope *	env,
		bool	final,
		struct ConfigSubset *	sub
	)

Prepare an email header.

Parameters

env	Envelope to prepare
final	true if this email is going to be sent (not postponed)
sub	Config Subset

Encode all the headers prior to sending the email.

For postponing (!final) do the necessary encodings only

Definition at line 773 of file sendlib.c.

{
  if (final)
  {
    if (!TAILQ_EMPTY(&env->bcc) && TAILQ_EMPTY(&env->to) && TAILQ_EMPTY(&env->cc))
    {
      /* some MTA's will put an Apparently-To: header field showing the Bcc:
       * recipients if there is no To: or Cc: field, so attempt to suppress
       * it by using an empty To: field.  */
      struct Address *to = mutt_addr_new();
      to->group = true;
      mutt_addrlist_append(&env->to, to);
      mutt_addrlist_append(&env->to, mutt_addr_new());
 
      char buf[1024] = { 0 };
      buf[0] = '\0';
      mutt_addr_cat(buf, sizeof(buf), "undisclosed-recipients", AddressSpecials);
 
      to->mailbox = mutt_str_dup(buf);
    }
 
    mutt_set_followup_to(env, sub);
 
    if (!env->message_id)
      env->message_id = gen_msgid();
  }
 
  /* Take care of 8-bit => 7-bit conversion. */
  rfc2047_encode_envelope(env);
  encode_headers(&env->userhdrs, sub);
}

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mutt_unprepare_envelope()

void mutt_unprepare_envelope

(

struct Envelope *

env

)

Undo the encodings of mutt_prepare_envelope()

Parameters

env	Envelope to unprepare

Decode all the headers of an email, e.g. when the sending failed or was aborted.

Definition at line 812 of file sendlib.c.

{
  struct ListNode *item = NULL;
  STAILQ_FOREACH(item, &env->userhdrs, entries)
  {
    rfc2047_decode(&item->data);
  }
 
  mutt_addrlist_clear(&env->mail_followup_to);
 
  /* back conversions */
  rfc2047_decode_envelope(env);
}

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bounce_message()

static int bounce_message ( FILE *  fp, struct Mailbox *  m, struct Email *  e, struct AddressList *  to, const char *  resent_from, struct AddressList *  env_from, struct ConfigSubset *  sub  )

static

Bounce an email message.

Parameters

fp	Handle of message
m	Mailbox
e	Email
to	Address to bounce to
resent_from	Address of new sender
env_from	Envelope of original sender
sub	Config Subset

Return values

0	Success
-1	Failure

Definition at line 838 of file sendlib.c.

{
  if (!e)
    return -1;
 
  int rc = 0;
 
  struct Buffer *tempfile = mutt_buffer_pool_get();
  mutt_buffer_mktemp(tempfile);
  FILE *fp_tmp = mutt_file_fopen(mutt_buffer_string(tempfile), "w");
  if (fp_tmp)
  {
    CopyHeaderFlags chflags = CH_XMIT | CH_NONEWLINE | CH_NOQFROM;
 
    const bool c_bounce_delivered = cs_subset_bool(sub, "bounce_delivered");
    if (!c_bounce_delivered)
      chflags |= CH_WEED_DELIVERED;
 
    if (!mutt_file_seek(fp, e->offset, SEEK_SET))
    {
      (void) mutt_file_fclose(&fp_tmp);
      return -1;
    }
    fprintf(fp_tmp, "Resent-From: %s\n", resent_from);
 
    struct Buffer *date = mutt_buffer_pool_get();
    mutt_date_make_date(date, cs_subset_bool(sub, "local_date_header"));
    fprintf(fp_tmp, "Resent-Date: %s\n", mutt_buffer_string(date));
    mutt_buffer_pool_release(&date);
 
    char *msgid_str = gen_msgid();
    fprintf(fp_tmp, "Resent-Message-ID: %s\n", msgid_str);
    FREE(&msgid_str);
    mutt_addrlist_write_file(to, fp_tmp, "Resent-To");
    mutt_copy_header(fp, e, fp_tmp, chflags, NULL, 0);
    fputc('\n', fp_tmp);
    mutt_file_copy_bytes(fp, fp_tmp, e->body->length);
    if (mutt_file_fclose(&fp_tmp) != 0)
    {
      mutt_perror(mutt_buffer_string(tempfile));
      unlink(mutt_buffer_string(tempfile));
      return -1;
    }
#ifdef USE_SMTP
    const char *const c_smtp_url = cs_subset_string(sub, "smtp_url");
    if (c_smtp_url)
    {
      rc = mutt_smtp_send(env_from, to, NULL, NULL, mutt_buffer_string(tempfile),
                          (e->body->encoding == ENC_8BIT), sub);
    }
    else
#endif
    {
      rc = mutt_invoke_sendmail(m, env_from, to, NULL, NULL, mutt_buffer_string(tempfile),
                                (e->body->encoding == ENC_8BIT), sub);
    }
  }
 
  mutt_buffer_pool_release(&tempfile);
  return rc;
}

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mutt_bounce_message()

int mutt_bounce_message	(	FILE *	fp,
		struct Mailbox *	m,
		struct Email *	e,
		struct AddressList *	to,
		struct ConfigSubset *	sub
	)

Bounce an email message.

Parameters

fp	Handle of message
m	Mailbox
e	Email
to	AddressList to bounce to
sub	Config Subset

Return values

0	Success
-1	Failure

Definition at line 912 of file sendlib.c.

{
  if (!fp || !e || !to || TAILQ_EMPTY(to))
    return -1;
 
  const char *fqdn = mutt_fqdn(true, sub);
  char *err = NULL;
 
  struct Address *from = mutt_default_from(sub);
  struct AddressList from_list = TAILQ_HEAD_INITIALIZER(from_list);
  mutt_addrlist_append(&from_list, from);
 
  /* mutt_default_from() does not use $real_name if the real name is not set
   * in $from, so we add it here.  The reason it is not added in
   * mutt_default_from() is that during normal sending, we execute
   * send-hooks and set the real_name last so that it can be changed based
   * upon message criteria.  */
  if (!from->personal)
  {
    const char *const c_real_name = cs_subset_string(sub, "real_name");
    from->personal = mutt_str_dup(c_real_name);
  }
 
  mutt_addrlist_qualify(&from_list, fqdn);
 
  rfc2047_encode_addrlist(&from_list, "Resent-From");
  if (mutt_addrlist_to_intl(&from_list, &err))
  {
    mutt_error(_("Bad IDN %s while preparing resent-from"), err);
    FREE(&err);
    mutt_addrlist_clear(&from_list);
    return -1;
  }
  struct Buffer *resent_from = mutt_buffer_pool_get();
  mutt_addrlist_write(&from_list, resent_from, false);
 
#ifdef USE_NNTP
  OptNewsSend = false;
#endif
 
  /* prepare recipient list. idna conversion appears to happen before this
   * function is called, since the user receives confirmation of the address
   * list being bounced to.  */
  struct AddressList resent_to = TAILQ_HEAD_INITIALIZER(resent_to);
  mutt_addrlist_copy(&resent_to, to, false);
  rfc2047_encode_addrlist(&resent_to, "Resent-To");
  int rc = bounce_message(fp, m, e, &resent_to, mutt_buffer_string(resent_from),
                          &from_list, sub);
  mutt_addrlist_clear(&resent_to);
  mutt_addrlist_clear(&from_list);
  mutt_buffer_pool_release(&resent_from);
  return rc;
}

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set_noconv_flags()

static void set_noconv_flags ( struct Body *  b, bool  flag  )

static

Set/reset the "x-mutt-noconv" flag.

Parameters

b	Body of email
flag	If true, set the flag, otherwise remove it

Definition at line 972 of file sendlib.c.

{
  for (; b; b = b->next)
  {
    if ((b->type == TYPE_MESSAGE) || (b->type == TYPE_MULTIPART))
    {
      set_noconv_flags(b->parts, flag);
    }
    else if ((b->type == TYPE_TEXT) && b->noconv)
    {
      if (flag)
        mutt_param_set(&b->parameter, "x-mutt-noconv", "yes");
      else
        mutt_param_delete(&b->parameter, "x-mutt-noconv");
    }
  }
}

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mutt_write_multiple_fcc()

int mutt_write_multiple_fcc	(	const char *	path,
		struct Email *	e,
		const char *	msgid,
		bool	post,
		char *	fcc,
		char **	finalpath,
		struct ConfigSubset *	sub
	)

Handle FCC with multiple, comma separated entries.

Parameters

[in]	path	Path to mailboxes (comma separated)
[in]	e	Email
[in]	msgid	Message id
[in]	post	If true, postpone message
[in]	fcc	fcc setting to save (postpone only)
[out]	finalpath	Final path of email
[in]	sub	Config Subset

Return values

0	Success
-1	Failure

Definition at line 1002 of file sendlib.c.

{
  char fcc_tok[PATH_MAX] = { 0 };
  char fcc_expanded[PATH_MAX] = { 0 };
 
  mutt_str_copy(fcc_tok, path, sizeof(fcc_tok));
 
  char *tok = strtok(fcc_tok, ",");
  if (!tok)
    return -1;
 
  mutt_debug(LL_DEBUG1, "Fcc: initial mailbox = '%s'\n", tok);
  /* mutt_expand_path already called above for the first token */
  int status = mutt_write_fcc(tok, e, msgid, post, fcc, finalpath, sub);
  if (status != 0)
    return status;
 
  while ((tok = strtok(NULL, ",")))
  {
    if (*tok == '\0')
      continue;
 
    /* Only call mutt_expand_path if tok has some data */
    mutt_debug(LL_DEBUG1, "Fcc: additional mailbox token = '%s'\n", tok);
    mutt_str_copy(fcc_expanded, tok, sizeof(fcc_expanded));
    mutt_expand_path(fcc_expanded, sizeof(fcc_expanded));
    mutt_debug(LL_DEBUG1, "     Additional mailbox expanded = '%s'\n", fcc_expanded);
    status = mutt_write_fcc(fcc_expanded, e, msgid, post, fcc, finalpath, sub);
    if (status != 0)
      return status;
  }
 
  return 0;
}

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mutt_write_fcc()

int mutt_write_fcc	(	const char *	path,
		struct Email *	e,
		const char *	msgid,
		bool	post,
		const char *	fcc,
		char **	finalpath,
		struct ConfigSubset *	sub
	)

Write email to FCC mailbox.

Parameters

[in]	path	Path to mailbox
[in]	e	Email
[in]	msgid	Message id
[in]	post	If true, postpone message, else fcc mode
[in]	fcc	fcc setting to save (postpone only)
[out]	finalpath	Final path of email
[in]	sub	Config Subset

Return values

0	Success
-1	Failure

Definition at line 1050 of file sendlib.c.

{
  struct Message *msg = NULL;
  struct Buffer *tempfile = NULL;
  FILE *fp_tmp = NULL;
  int rc = -1;
  bool need_mailbox_cleanup = false;
  struct stat st = { 0 };
  MsgOpenFlags onm_flags;
 
  if (post)
    set_noconv_flags(e->body, true);
 
#ifdef RECORD_FOLDER_HOOK
  mutt_folder_hook(path, NULL);
#endif
  struct Mailbox *m_fcc = mx_path_resolve(path);
  bool old_append = m_fcc->append;
  if (!mx_mbox_open(m_fcc, MUTT_APPEND | MUTT_QUIET))
  {
    mutt_debug(LL_DEBUG1, "unable to open mailbox %s in append-mode, aborting\n", path);
    goto done;
  }
 
  /* We need to add a Content-Length field to avoid problems where a line in
   * the message body begins with "From " */
  if ((m_fcc->type == MUTT_MMDF) || (m_fcc->type == MUTT_MBOX))
  {
    tempfile = mutt_buffer_pool_get();
    mutt_buffer_mktemp(tempfile);
    fp_tmp = mutt_file_fopen(mutt_buffer_string(tempfile), "w+");
    if (!fp_tmp)
    {
      mutt_perror(mutt_buffer_string(tempfile));
      mx_mbox_close(m_fcc);
      goto done;
    }
    /* remember new mail status before appending message */
    need_mailbox_cleanup = true;
    stat(path, &st);
  }
 
  e->read = !post; /* make sure to put it in the 'cur' directory (maildir) */
  onm_flags = MUTT_ADD_FROM;
  if (post)
    onm_flags |= MUTT_SET_DRAFT;
  msg = mx_msg_open_new(m_fcc, e, onm_flags);
  if (!msg)
  {
    mutt_file_fclose(&fp_tmp);
    mx_mbox_close(m_fcc);
    goto done;
  }
 
  const bool c_crypt_protected_headers_read = cs_subset_bool(sub, "crypt_protected_headers_read");
 
  /* post == 1 => postpone message.
   * post == 0 => Normal mode.  */
  mutt_rfc822_write_header(msg->fp, e->env, e->body,
                           post ? MUTT_WRITE_HEADER_POSTPONE : MUTT_WRITE_HEADER_FCC, false,
                           c_crypt_protected_headers_read &&
                               mutt_should_hide_protected_subject(e),
                           sub);
 
  /* (postponement) if this was a reply of some sort, <msgid> contains the
   * Message-ID: of message replied to.  Save it using a special X-Mutt-
   * header so it can be picked up if the message is recalled at a later
   * point in time.  This will allow the message to be marked as replied if
   * the same mailbox is still open.  */
  if (post && msgid)
    fprintf(msg->fp, "Mutt-References: %s\n", msgid);
 
  /* (postponement) save the Fcc: using a special X-Mutt- header so that
   * it can be picked up when the message is recalled */
  if (post && fcc)
    fprintf(msg->fp, "Mutt-Fcc: %s\n", fcc);
 
  if ((m_fcc->type == MUTT_MMDF) || (m_fcc->type == MUTT_MBOX))
    fprintf(msg->fp, "Status: RO\n");
 
  /* (postponement) if the mail is to be signed or encrypted, save this info */
  if (((WithCrypto & APPLICATION_PGP) != 0) && post && (e->security & APPLICATION_PGP))
  {
    fputs("Mutt-PGP: ", msg->fp);
    if (e->security & SEC_ENCRYPT)
      fputc('E', msg->fp);
    if (e->security & SEC_OPPENCRYPT)
      fputc('O', msg->fp);
    if (e->security & SEC_SIGN)
    {
      fputc('S', msg->fp);
 
      const char *const c_pgp_sign_as = cs_subset_string(sub, "pgp_sign_as");
      if (c_pgp_sign_as)
        fprintf(msg->fp, "<%s>", c_pgp_sign_as);
    }
    if (e->security & SEC_INLINE)
      fputc('I', msg->fp);
#ifdef USE_AUTOCRYPT
    if (e->security & SEC_AUTOCRYPT)
      fputc('A', msg->fp);
    if (e->security & SEC_AUTOCRYPT_OVERRIDE)
      fputc('Z', msg->fp);
#endif
    fputc('\n', msg->fp);
  }
 
  /* (postponement) if the mail is to be signed or encrypted, save this info */
  if (((WithCrypto & APPLICATION_SMIME) != 0) && post && (e->security & APPLICATION_SMIME))
  {
    fputs("Mutt-SMIME: ", msg->fp);
    if (e->security & SEC_ENCRYPT)
    {
      fputc('E', msg->fp);
 
      const char *const c_smime_encrypt_with = cs_subset_string(sub, "smime_encrypt_with");
      if (c_smime_encrypt_with)
        fprintf(msg->fp, "C<%s>", c_smime_encrypt_with);
    }
    if (e->security & SEC_OPPENCRYPT)
      fputc('O', msg->fp);
    if (e->security & SEC_SIGN)
    {
      fputc('S', msg->fp);
 
      const char *const c_smime_sign_as = cs_subset_string(sub, "smime_sign_as");
      if (c_smime_sign_as)
        fprintf(msg->fp, "<%s>", c_smime_sign_as);
    }
    if (e->security & SEC_INLINE)
      fputc('I', msg->fp);
    fputc('\n', msg->fp);
  }
 
#ifdef MIXMASTER
  /* (postponement) if the mail is to be sent through a mixmaster
   * chain, save that information */
 
  if (post && !STAILQ_EMPTY(&e->chain))
  {
    fputs("Mutt-Mix:", msg->fp);
    struct ListNode *p = NULL;
    STAILQ_FOREACH(p, &e->chain, entries)
    {
      fprintf(msg->fp, " %s", (char *) p->data);
    }
 
    fputc('\n', msg->fp);
  }
#endif
 
  if (fp_tmp)
  {
    mutt_write_mime_body(e->body, fp_tmp, sub);
 
    /* make sure the last line ends with a newline.  Emacs doesn't ensure this
     * will happen, and it can cause problems parsing the mailbox later.  */
    if (mutt_file_seek(fp_tmp, -1, SEEK_END) && (fgetc(fp_tmp) != '\n') &&
        mutt_file_seek(fp_tmp, 0, SEEK_END))
    {
      fputc('\n', fp_tmp);
    }
 
    fflush(fp_tmp);
    if (ferror(fp_tmp))
    {
      mutt_debug(LL_DEBUG1, "%s: write failed\n", mutt_buffer_string(tempfile));
      mutt_file_fclose(&fp_tmp);
      unlink(mutt_buffer_string(tempfile));
      mx_msg_commit(m_fcc, msg); /* XXX really? */
      mx_msg_close(m_fcc, &msg);
      mx_mbox_close(m_fcc);
      goto done;
    }
 
    /* count the number of lines */
    int lines = 0;
    char line_buf[1024] = { 0 };
    rewind(fp_tmp);
    while (fgets(line_buf, sizeof(line_buf), fp_tmp))
      lines++;
    fprintf(msg->fp, "Content-Length: " OFF_T_FMT "\n", (LOFF_T) ftello(fp_tmp));
    fprintf(msg->fp, "Lines: %d\n\n", lines);
 
    /* copy the body and clean up */
    rewind(fp_tmp);
    rc = mutt_file_copy_stream(fp_tmp, msg->fp);
    if (mutt_file_fclose(&fp_tmp) != 0)
      rc = -1;
    /* if there was an error, leave the temp version */
    if (rc >= 0)
    {
      unlink(mutt_buffer_string(tempfile));
      rc = 0;
    }
  }
  else
  {
    fputc('\n', msg->fp); /* finish off the header */
    rc = mutt_write_mime_body(e->body, msg->fp, sub);
  }
 
  if (mx_msg_commit(m_fcc, msg) != 0)
    rc = -1;
  else if (finalpath)
    *finalpath = mutt_str_dup(msg->committed_path);
  mx_msg_close(m_fcc, &msg);
  mx_mbox_close(m_fcc);
 
  if (!post && need_mailbox_cleanup)
    mutt_mailbox_cleanup(path, &st);
 
  if (post)
    set_noconv_flags(e->body, false);
 
done:
  m_fcc->append = old_append;
  mailbox_free(&m_fcc);
 
#ifdef RECORD_FOLDER_HOOK
  /* We ran a folder hook for the destination mailbox,
   * now we run it for the user's current mailbox */
  const struct Mailbox *m_cur = get_current_mailbox();
  if (m_cur)
    mutt_folder_hook(m_cur->path, m_cur->desc);
#endif
 
  if (fp_tmp)
  {
    mutt_file_fclose(&fp_tmp);
    unlink(mutt_buffer_string(tempfile));
  }
  mutt_buffer_pool_release(&tempfile);
 
  return rc;
}

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