handler.c File Reference

Decide how to display email content. More...

#include "config.h"
#include <stddef.h>
#include <ctype.h>
#include <iconv.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include "mutt/lib.h"
#include "config/lib.h"
#include "email/lib.h"
#include "core/lib.h"
#include "mutt.h"
#include "handler.h"
#include "copy.h"
#include "enriched.h"
#include "keymap.h"
#include "mailcap.h"
#include "mutt_attach.h"
#include "mutt_globals.h"
#include "mutt_logging.h"
#include "muttlib.h"
#include "opcodes.h"
#include "options.h"
#include "rfc3676.h"
#include "state.h"
#include "ncrypt/lib.h"
#include <libintl.h>

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Macros
#define	BUFI_SIZE   1000
#define	BUFO_SIZE   2000
#define	TXT_HTML   1
#define	TXT_PLAIN   2
#define	TXT_ENRICHED   3

Typedefs
typedef int(*	handler_t) (struct Body *b, struct State *s)
	Manage a PGP or S/MIME encrypted MIME part. More...

Functions
static void	print_part_line (struct State *s, struct Body *b, int n)
	Print a separator for the Mime part. More...
static void	convert_to_state (iconv_t cd, char *bufi, size_t *l, struct State *s)
	Convert text and write it to a file. More...
static void	decode_xbit (struct State *s, long len, bool istext, iconv_t cd)
	Decode xbit-encoded text. More...
static int	qp_decode_triple (char *s, char *d)
	Decode a quoted-printable triplet. More...
static void	qp_decode_line (char *dest, char *src, size_t *l, int last)
	Decode a line of quoted-printable text. More...
static void	decode_quoted (struct State *s, long len, bool istext, iconv_t cd)
	Decode an attachment encoded with quoted-printable. More...
static unsigned char	decode_byte (char ch)
	Decode a uuencoded byte. More...
static void	decode_uuencoded (struct State *s, long len, bool istext, iconv_t cd)
	Decode uuencoded text. More...
static bool	is_mmnoask (const char *buf)
	Metamail compatibility: should the attachment be autoviewed? More...
static bool	is_autoview (struct Body *b)
	Should email body be filtered by mailcap. More...
static int	autoview_handler (struct Body *a, struct State *s)
	Handler for autoviewable attachments - Implements handler_t. More...
static int	text_plain_handler (struct Body *b, struct State *s)
	Handler for plain text - Implements handler_t. More...
static int	message_handler (struct Body *a, struct State *s)
	Handler for message/rfc822 body parts - Implements handler_t. More...
static int	external_body_handler (struct Body *b, struct State *s)
	Handler for external-body emails - Implements handler_t. More...
static int	alternative_handler (struct Body *a, struct State *s)
	Handler for multipart alternative emails - Implements handler_t. More...
static int	multilingual_handler (struct Body *a, struct State *s)
	Handler for multi-lingual emails - Implements handler_t. More...
static int	multipart_handler (struct Body *a, struct State *s)
	Handler for multipart emails - Implements handler_t. More...
static int	run_decode_and_handler (struct Body *b, struct State *s, handler_t handler, bool plaintext)
	Run an appropriate decoder for an email. More...
static int	valid_pgp_encrypted_handler (struct Body *b, struct State *s)
	Handler for valid pgp-encrypted emails - Implements handler_t. More...
static int	malformed_pgp_encrypted_handler (struct Body *b, struct State *s)
	Handler for invalid pgp-encrypted emails - Implements handler_t. More...
void	mutt_decode_base64 (struct State *s, size_t len, bool istext, iconv_t cd)
	Decode base64-encoded text. More...
int	mutt_body_handler (struct Body *b, struct State *s)
	Handler for the Body of an email. More...
bool	mutt_can_decode (struct Body *a)
	Will decoding the attachment produce any output. More...
void	mutt_decode_attachment (struct Body *b, struct State *s)
	Decode an email's attachment. More...

Variables
bool	C_HonorDisposition
	Config: Don't display MIME parts inline if they have a disposition of 'attachment'. More...
bool	C_ImplicitAutoview
	Config: Display MIME attachments inline if a 'copiousoutput' mailcap entry exists. More...
bool	C_IncludeEncrypted
	Config: Whether to include encrypted content when replying. More...
bool	C_IncludeOnlyfirst
	Config: Only include the first attachment when replying. More...
struct Slist *	C_PreferredLanguages
	Config: Preferred languages for multilingual MIME. More...
bool	C_ReflowText
	Config: Reformat paragraphs of 'format=flowed' text. More...
char *	C_ShowMultipartAlternative
	Config: How to display 'multipart/alternative' MIME parts. More...

Detailed Description

Decide how to display email content.

Authors

• Michael R. Elkins

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 handler.c.

Macro Definition Documentation

BUFI_SIZE

#define BUFI_SIZE   1000

Definition at line 72 of file handler.c.

BUFO_SIZE

#define BUFO_SIZE   2000

Definition at line 73 of file handler.c.

TXT_HTML

#define TXT_HTML   1

Definition at line 75 of file handler.c.

TXT_PLAIN

#define TXT_PLAIN   2

Definition at line 76 of file handler.c.

TXT_ENRICHED

#define TXT_ENRICHED   3

Definition at line 77 of file handler.c.

Typedef Documentation

handler_t

typedef int(* handler_t) (struct Body *b, struct State *s)

Manage a PGP or S/MIME encrypted MIME part.

Parameters

m	Body of the email
s	State of text being processed

Return values

0	Success
-1	Error

Definition at line 86 of file handler.c.

Function Documentation

print_part_line()

static void print_part_line ( struct State *  s, struct Body *  b, int  n  )

static

Print a separator for the Mime part.

Parameters

s	State of text being processed
b	Body of the email
n	Part number for multipart emails (0 otherwise)

Definition at line 94 of file handler.c.

{
  char length[5];
  mutt_str_pretty_size(length, sizeof(length), b->length);
  state_mark_attach(s);
  char *charset = mutt_param_get(&b->parameter, "charset");
  if (n == 0)
  {
    state_printf(s, _("[-- Type: %s/%s%s%s, Encoding: %s, Size: %s --]\n"),
                 TYPE(b), b->subtype, charset ? "; charset=" : "",
                 charset ? charset : "", ENCODING(b->encoding), length);
  }
  else
  {
    state_printf(s, _("[-- Alternative Type #%d: %s/%s%s%s, Encoding: %s, Size: %s --]\n"),
                 n, TYPE(b), b->subtype, charset ? "; charset=" : "",
                 charset ? charset : "", ENCODING(b->encoding), length);
  }
}

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convert_to_state()

static void convert_to_state ( iconv_t  cd, char *  bufi, size_t *  l, struct State *  s  )

static

Convert text and write it to a file.

Parameters

cd	Iconv conversion descriptor
bufi	Buffer with text to convert
l	Length of buffer
s	State to write to

Definition at line 121 of file handler.c.

{
  char bufo[BUFO_SIZE];
  const char *ib = NULL;
  char *ob = NULL;
  size_t ibl, obl;

  if (!bufi)
  {
    if (cd != (iconv_t)(-1))
    {
      ob = bufo;
      obl = sizeof(bufo);
      iconv(cd, NULL, NULL, &ob, &obl);
      if (ob != bufo)
        state_prefix_put(s, bufo, ob - bufo);
    }
    return;
  }

  if (cd == (iconv_t)(-1))
  {
    state_prefix_put(s, bufi, *l);
    *l = 0;
    return;
  }

  ib = bufi;
  ibl = *l;
  while (true)
  {
    ob = bufo;
    obl = sizeof(bufo);
    mutt_ch_iconv(cd, &ib, &ibl, &ob, &obl, 0, "?", NULL);
    if (ob == bufo)
      break;
    state_prefix_put(s, bufo, ob - bufo);
  }
  memmove(bufi, ib, ibl);
  *l = ibl;
}

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decode_xbit()

static void decode_xbit ( struct State *  s, long  len, bool  istext, iconv_t  cd  )

static

Decode xbit-encoded text.

Parameters

s	State to work with
len	Length of text to decode
istext	Mime part is plain text
cd	Iconv conversion descriptor

Definition at line 170 of file handler.c.

{
  if (!istext)
  {
    mutt_file_copy_bytes(s->fp_in, s->fp_out, len);
    return;
  }

  state_set_prefix(s);

  int c;
  char bufi[BUFI_SIZE];
  size_t l = 0;
  while (((c = fgetc(s->fp_in)) != EOF) && len--)
  {
    if ((c == '\r') && len)
    {
      const int ch = fgetc(s->fp_in);
      if (ch == '\n')
      {
        c = ch;
        len--;
      }
      else
        ungetc(ch, s->fp_in);
    }

    bufi[l++] = c;
    if (l == sizeof(bufi))
      convert_to_state(cd, bufi, &l, s);
  }

  convert_to_state(cd, bufi, &l, s);
  convert_to_state(cd, 0, 0, s);

  state_reset_prefix(s);
}

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qp_decode_triple()

static int qp_decode_triple ( char *  s, char *  d  )

static

Decode a quoted-printable triplet.

Parameters

s	State to work with
d	Decoded character

Return values

0	Success
-1	Error

Definition at line 215 of file handler.c.

{
  /* soft line break */
  if ((s[0] == '=') && (s[1] == '\0'))
    return 1;

  /* quoted-printable triple */
  if ((s[0] == '=') && isxdigit((unsigned char) s[1]) && isxdigit((unsigned char) s[2]))
  {
    *d = (hexval(s[1]) << 4) | hexval(s[2]);
    return 0;
  }

  /* something else */
  return -1;
}

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qp_decode_line()

static void qp_decode_line ( char *  dest, char *  src, size_t *  l, int  last  )

static

Decode a line of quoted-printable text.

Parameters

dest	Buffer for result
src	Text to decode
l	Bytes written to buffer
last	Last character of the line

Definition at line 239 of file handler.c.

{
  char *d = NULL, *s = NULL;
  char c = 0;

  int kind = -1;
  bool soft = false;

  /* decode the line */

  for (d = dest, s = src; *s;)
  {
    switch ((kind = qp_decode_triple(s, &c)))
    {
      case 0:
        *d++ = c;
        s += 3;
        break; /* qp triple */
      case -1:
        *d++ = *s++;
        break; /* single character */
      case 1:
        soft = true;
        s++;
        break; /* soft line break */
    }
  }

  if (!soft && (last == '\n'))
  {
    /* neither \r nor \n as part of line-terminating CRLF
     * may be qp-encoded, so remove \r and \n-terminate;
     * see RFC2045, sect. 6.7, (1): General 8bit representation */
    if ((kind == 0) && (c == '\r'))
      *(d - 1) = '\n';
    else
      *d++ = '\n';
  }

  *d = '\0';
  *l = d - dest;
}

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decode_quoted()

static void decode_quoted ( struct State *  s, long  len, bool  istext, iconv_t  cd  )

static

Decode an attachment encoded with quoted-printable.

Parameters

s	State to work with
len	Length of text to decode
istext	Mime part is plain text
cd	Iconv conversion descriptor

Why doesn't this overflow any buffers? First, it's guaranteed that the length of a line grows when you en-code it to quoted-printable. That means that we always can store the result in a buffer of at most the same size.

Now, we don't special-case if the line we read with fgets() isn't terminated. We don't care about this, since 256 > 78, so corrupted input will just be corrupted a bit more. That implies that 256+1 bytes are always sufficient to store the result of qp_decode_line.

Finally, at soft line breaks, some part of a multibyte character may have been left over by convert_to_state(). This shouldn't be more than 6 characters, so 256+7 should be sufficient memory to store the decoded data.

Just to make sure that I didn't make some off-by-one error above, we just use 512 for the target buffer's size.

Definition at line 307 of file handler.c.

{
  char line[256];
  char decline[512];
  size_t l = 0;
  size_t l3;

  if (istext)
    state_set_prefix(s);

  while (len > 0)
  {
    /* It's ok to use a fixed size buffer for input, even if the line turns
     * out to be longer than this.  Just process the line in chunks.  This
     * really shouldn't happen according the MIME spec, since Q-P encoded
     * lines are at most 76 characters, but we should be liberal about what
     * we accept.  */
    if (!fgets(line, MIN((ssize_t) sizeof(line), len + 1), s->fp_in))
      break;

    size_t linelen = strlen(line);
    len -= linelen;

    /* inspect the last character we read so we can tell if we got the
     * entire line.  */
    const int last = (linelen != 0) ? line[linelen - 1] : 0;

    /* chop trailing whitespace if we got the full line */
    if (last == '\n')
    {
      while ((linelen > 0) && IS_SPACE(line[linelen - 1]))
        linelen--;
      line[linelen] = '\0';
    }

    /* decode and do character set conversion */
    qp_decode_line(decline + l, line, &l3, last);
    l += l3;
    convert_to_state(cd, decline, &l, s);
  }

  convert_to_state(cd, 0, 0, s);
  state_reset_prefix(s);
}

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decode_byte()

static unsigned char decode_byte ( char  ch )

static

Decode a uuencoded byte.

Parameters

ch	Character to decode

Return values

num	Decoded value

Definition at line 357 of file handler.c.

{
  if ((ch < 32) || (ch > 95))
    return 0;
  return ch - 32;
}

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decode_uuencoded()

static void decode_uuencoded ( struct State *  s, long  len, bool  istext, iconv_t  cd  )

static

Decode uuencoded text.

Parameters

s	State to work with
len	Length of text to decode
istext	Mime part is plain text
cd	Iconv conversion descriptor

Definition at line 371 of file handler.c.

{
  char tmps[128];
  char *pt = NULL;
  char bufi[BUFI_SIZE];
  size_t k = 0;

  if (istext)
    state_set_prefix(s);

  while (len > 0)
  {
    if (!fgets(tmps, sizeof(tmps), s->fp_in))
      return;
    len -= mutt_str_len(tmps);
    if (mutt_str_startswith(tmps, "begin "))
      break;
  }
  while (len > 0)
  {
    if (!fgets(tmps, sizeof(tmps), s->fp_in))
      return;
    len -= mutt_str_len(tmps);
    if (mutt_str_startswith(tmps, "end"))
      break;
    pt = tmps;
    const unsigned char linelen = decode_byte(*pt);
    pt++;
    for (unsigned char c = 0; c < linelen;)
    {
      for (char l = 2; l <= 6; l += 2)
      {
        char out = decode_byte(*pt) << l;
        pt++;
        out |= (decode_byte(*pt) >> (6 - l));
        bufi[k++] = out;
        c++;
        if (c == linelen)
          break;
      }
      convert_to_state(cd, bufi, &k, s);
      pt++;
    }
  }

  convert_to_state(cd, bufi, &k, s);
  convert_to_state(cd, 0, 0, s);

  state_reset_prefix(s);
}

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is_mmnoask()

static bool is_mmnoask ( const char *  buf )

static

Metamail compatibility: should the attachment be autoviewed?

Parameters

buf	Mime type, e.g. 'text/plain'

Return values

true	Metamail "no ask" is true

Test if the MM_NOASK environment variable should allow autoviewing of the attachment.

Note

If MM_NOASK=1 then the function will automatically return true.

Definition at line 432 of file handler.c.

{
  const char *val = mutt_str_getenv("MM_NOASK");
  if (!val)
    return false;

  char *p = NULL;
  char tmp[1024];
  char *q = NULL;

  if (mutt_str_equal(val, "1"))
    return true;

  mutt_str_copy(tmp, val, sizeof(tmp));
  p = tmp;

  while ((p = strtok(p, ",")))
  {
    q = strrchr(p, '/');
    if (q)
    {
      if (q[1] == '*')
      {
        if (mutt_istrn_equal(buf, p, q - p))
          return true;
      }
      else
      {
        if (mutt_istr_equal(buf, p))
          return true;
      }
    }
    else
    {
      const size_t plen = mutt_istr_startswith(buf, p);
      if ((plen != 0) && (buf[plen] == '/'))
        return true;
    }

    p = NULL;
  }

  return false;
}

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is_autoview()

static bool is_autoview ( struct Body *  b )

static

Should email body be filtered by mailcap.

Parameters

b	Body of the email

Return values

1	body part should be filtered by a mailcap entry prior to viewing inline
0	otherwise

Definition at line 483 of file handler.c.

{
  char type[256];
  bool is_av = false;

  snprintf(type, sizeof(type), "%s/%s", TYPE(b), b->subtype);

  if (C_ImplicitAutoview)
  {
    /* $implicit_autoview is essentially the same as "auto_view *" */
    is_av = true;
  }
  else
  {
    /* determine if this type is on the user's auto_view list */
    mutt_check_lookup_list(b, type, sizeof(type));
    struct ListNode *np = NULL;
    STAILQ_FOREACH(np, &AutoViewList, entries)
    {
      int i = mutt_str_len(np->data) - 1;
      if (((i > 0) && (np->data[i - 1] == '/') && (np->data[i] == '*') &&
           mutt_istrn_equal(type, np->data, i)) ||
          mutt_istr_equal(type, np->data))
      {
        is_av = true;
        break;
      }
    }

    if (is_mmnoask(type))
      is_av = true;
  }

  /* determine if there is a mailcap entry suitable for auto_view
   *
   * @warning type is altered by this call as a result of 'mime_lookup' support */
  if (is_av)
    return mailcap_lookup(b, type, sizeof(type), NULL, MUTT_MC_AUTOVIEW);

  return false;
}

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autoview_handler()

static int autoview_handler ( struct Body *  a, struct State *  s  )

static

Handler for autoviewable attachments - Implements handler_t.

Definition at line 528 of file handler.c.

{
  struct MailcapEntry *entry = mailcap_entry_new();
  char buf[1024];
  char type[256];
  struct Buffer *cmd = mutt_buffer_pool_get();
  struct Buffer *tempfile = mutt_buffer_pool_get();
  char *fname = NULL;
  FILE *fp_in = NULL;
  FILE *fp_out = NULL;
  FILE *fp_err = NULL;
  pid_t pid;
  int rc = 0;

  snprintf(type, sizeof(type), "%s/%s", TYPE(a), a->subtype);
  mailcap_lookup(a, type, sizeof(type), entry, MUTT_MC_AUTOVIEW);

  fname = mutt_str_dup(a->filename);
  mutt_file_sanitize_filename(fname, true);
  mailcap_expand_filename(entry->nametemplate, fname, tempfile);
  FREE(&fname);

  if (entry->command)
  {
    mutt_buffer_strcpy(cmd, entry->command);

    /* mailcap_expand_command returns 0 if the file is required */
    bool piped = mailcap_expand_command(a, mutt_b2s(tempfile), type, cmd);

    if (s->flags & MUTT_DISPLAY)
    {
      state_mark_attach(s);
      state_printf(s, _("[-- Autoview using %s --]\n"), mutt_b2s(cmd));
      mutt_message(_("Invoking autoview command: %s"), mutt_b2s(cmd));
    }

    fp_in = mutt_file_fopen(mutt_b2s(tempfile), "w+");
    if (!fp_in)
    {
      mutt_perror("fopen");
      mailcap_entry_free(&entry);
      rc = -1;
      goto cleanup;
    }

    mutt_file_copy_bytes(s->fp_in, fp_in, a->length);

    if (piped)
    {
      unlink(mutt_b2s(tempfile));
      fflush(fp_in);
      rewind(fp_in);
      pid = filter_create_fd(mutt_b2s(cmd), NULL, &fp_out, &fp_err, fileno(fp_in), -1, -1);
    }
    else
    {
      mutt_file_fclose(&fp_in);
      pid = filter_create(mutt_b2s(cmd), NULL, &fp_out, &fp_err);
    }

    if (pid < 0)
    {
      mutt_perror(_("Can't create filter"));
      if (s->flags & MUTT_DISPLAY)
      {
        state_mark_attach(s);
        state_printf(s, _("[-- Can't run %s. --]\n"), mutt_b2s(cmd));
      }
      rc = -1;
      goto bail;
    }

    if (s->prefix)
    {
      while (fgets(buf, sizeof(buf), fp_out))
      {
        state_puts(s, s->prefix);
        state_puts(s, buf);
      }
      /* check for data on stderr */
      if (fgets(buf, sizeof(buf), fp_err))
      {
        if (s->flags & MUTT_DISPLAY)
        {
          state_mark_attach(s);
          state_printf(s, _("[-- Autoview stderr of %s --]\n"), mutt_b2s(cmd));
        }

        state_puts(s, s->prefix);
        state_puts(s, buf);
        while (fgets(buf, sizeof(buf), fp_err))
        {
          state_puts(s, s->prefix);
          state_puts(s, buf);
        }
      }
    }
    else
    {
      mutt_file_copy_stream(fp_out, s->fp_out);
      /* Check for stderr messages */
      if (fgets(buf, sizeof(buf), fp_err))
      {
        if (s->flags & MUTT_DISPLAY)
        {
          state_mark_attach(s);
          state_printf(s, _("[-- Autoview stderr of %s --]\n"), mutt_b2s(cmd));
        }

        state_puts(s, buf);
        mutt_file_copy_stream(fp_err, s->fp_out);
      }
    }

  bail:
    mutt_file_fclose(&fp_out);
    mutt_file_fclose(&fp_err);

    filter_wait(pid);
    if (piped)
      mutt_file_fclose(&fp_in);
    else
      mutt_file_unlink(mutt_b2s(tempfile));

    if (s->flags & MUTT_DISPLAY)
      mutt_clear_error();
  }

cleanup:
  mailcap_entry_free(&entry);

  mutt_buffer_pool_release(&cmd);
  mutt_buffer_pool_release(&tempfile);

  return rc;
}

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text_plain_handler()

static int text_plain_handler ( struct Body *  b, struct State *  s  )

static

Handler for plain text - Implements handler_t.

Return values

0

Always

When generating format=flowed ($text_flowed is set) from format=fixed, strip all trailing spaces to improve interoperability; if $text_flowed is unset, simply verbatim copy input.

Definition at line 673 of file handler.c.

{
  char *buf = NULL;
  size_t sz = 0;

  while ((buf = mutt_file_read_line(buf, &sz, s->fp_in, NULL, 0)))
  {
    if (!mutt_str_equal(buf, "-- ") && C_TextFlowed)
    {
      size_t len = mutt_str_len(buf);
      while ((len > 0) && (buf[len - 1] == ' '))
        buf[--len] = '\0';
    }
    if (s->prefix)
      state_puts(s, s->prefix);
    state_puts(s, buf);
    state_putc(s, '\n');
  }

  FREE(&buf);
  return 0;
}

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message_handler()

static int message_handler ( struct Body *  a, struct State *  s  )

static

Handler for message/rfc822 body parts - Implements handler_t.

Definition at line 699 of file handler.c.

{
  struct stat st;
  struct Body *b = NULL;
  LOFF_T off_start;
  int rc = 0;

  off_start = ftello(s->fp_in);
  if (off_start < 0)
    return -1;

  if ((a->encoding == ENC_BASE64) || (a->encoding == ENC_QUOTED_PRINTABLE) ||
      (a->encoding == ENC_UUENCODED))
  {
    fstat(fileno(s->fp_in), &st);
    b = mutt_body_new();
    b->length = (LOFF_T) st.st_size;
    b->parts = mutt_rfc822_parse_message(s->fp_in, b);
  }
  else
    b = a;

  if (b->parts)
  {
    CopyHeaderFlags chflags = CH_DECODE | CH_FROM;
    if ((s->flags & MUTT_WEED) || ((s->flags & (MUTT_DISPLAY | MUTT_PRINTING)) && C_Weed))
      chflags |= CH_WEED | CH_REORDER;
    if (s->prefix)
      chflags |= CH_PREFIX;
    if (s->flags & MUTT_DISPLAY)
      chflags |= CH_DISPLAY;

    mutt_copy_hdr(s->fp_in, s->fp_out, off_start, b->parts->offset, chflags, s->prefix, 0);

    if (s->prefix)
      state_puts(s, s->prefix);
    state_putc(s, '\n');

    rc = mutt_body_handler(b->parts, s);
  }

  if ((a->encoding == ENC_BASE64) || (a->encoding == ENC_QUOTED_PRINTABLE) ||
      (a->encoding == ENC_UUENCODED))
  {
    mutt_body_free(&b);
  }

  return rc;
}

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external_body_handler()

static int external_body_handler ( struct Body *  b, struct State *  s  )

static

Handler for external-body emails - Implements handler_t.

Definition at line 752 of file handler.c.

{
  const char *str = NULL;
  char strbuf[1024];

  const char *access_type = mutt_param_get(&b->parameter, "access-type");
  if (!access_type)
  {
    if (s->flags & MUTT_DISPLAY)
    {
      state_mark_attach(s);
      state_puts(s, _("[-- Error: message/external-body has no access-type "
                      "parameter --]\n"));
      return 0;
    }
    else
      return -1;
  }

  const char *expiration = mutt_param_get(&b->parameter, "expiration");
  time_t expire;
  if (expiration)
    expire = mutt_date_parse_date(expiration, NULL);
  else
    expire = -1;

  if (mutt_istr_equal(access_type, "x-mutt-deleted"))
  {
    if (s->flags & (MUTT_DISPLAY | MUTT_PRINTING))
    {
      char pretty_size[10];
      char *length = mutt_param_get(&b->parameter, "length");
      if (length)
      {
        long size = strtol(length, NULL, 10);
        mutt_str_pretty_size(pretty_size, sizeof(pretty_size), size);
        if (expire != -1)
        {
          str = ngettext(
              /* L10N: If the translation of this string is a multi line string, then
                 each line should start with "[-- " and end with " --]".
                 The first "%s/%s" is a MIME type, e.g. "text/plain". The last %s
                 expands to a date as returned by `mutt_date_parse_date()`.

                 Note: The size argument printed is not the actual number as passed
                 to gettext but the prettified version, e.g. size = 2048 will be
                 printed as 2K.  Your language might be sensitive to that: For
                 example although '1K' and '1024' represent the same number your
                 language might inflect the noun 'byte' differently.

                 Sadly, we can't do anything about that at the moment besides
                 passing the precise size in bytes. If you are interested the
                 function responsible for the prettification is
                 mutt_str_pretty_size() in mutt/string.c. */
              "[-- This %s/%s attachment (size %s byte) has been deleted --]\n"
              "[-- on %s --]\n",
              "[-- This %s/%s attachment (size %s bytes) has been deleted --]\n"
              "[-- on %s --]\n",
              size);
        }
        else
        {
          str = ngettext(
              /* L10N: If the translation of this string is a multi line string, then
                 each line should start with "[-- " and end with " --]".
                 The first "%s/%s" is a MIME type, e.g. "text/plain".

                 Note: The size argument printed is not the actual number as passed
                 to gettext but the prettified version, e.g. size = 2048 will be
                 printed as 2K.  Your language might be sensitive to that: For
                 example although '1K' and '1024' represent the same number your
                 language might inflect the noun 'byte' differently.

                 Sadly, we can't do anything about that at the moment besides
                 passing the precise size in bytes. If you are interested the
                 function responsible for the prettification is
                 mutt_str_pretty_size() in mutt/string.c.  */
              "[-- This %s/%s attachment (size %s byte) has been deleted --]\n",
              "[-- This %s/%s attachment (size %s bytes) has been deleted "
              "--]\n",
              size);
        }
      }
      else
      {
        pretty_size[0] = '\0';
        if (expire != -1)
        {
          /* L10N: If the translation of this string is a multi line string, then
             each line should start with "[-- " and end with " --]".
             The first "%s/%s" is a MIME type, e.g. "text/plain". The last %s
             expands to a date as returned by `mutt_date_parse_date()`.

             Caution: Argument three %3$ is also defined but should not be used
             in this translation!  */
          str = _("[-- This %s/%s attachment has been deleted --]\n[-- on %4$s "
                  "--]\n");
        }
        else
        {
          /* L10N: If the translation of this string is a multi line string, then
             each line should start with "[-- " and end with " --]".
             The first "%s/%s" is a MIME type, e.g. "text/plain". */
          str = _("[-- This %s/%s attachment has been deleted --]\n");
        }
      }

      snprintf(strbuf, sizeof(strbuf), str, TYPE(b->parts), b->parts->subtype,
               pretty_size, expiration);
      state_attach_puts(s, strbuf);
      if (b->parts->filename)
      {
        state_mark_attach(s);
        state_printf(s, _("[-- name: %s --]\n"), b->parts->filename);
      }

      CopyHeaderFlags chflags = CH_DECODE;
      if (C_Weed)
        chflags |= CH_WEED | CH_REORDER;

      mutt_copy_hdr(s->fp_in, s->fp_out, ftello(s->fp_in), b->parts->offset,
                    chflags, NULL, 0);
    }
  }
  else if (expiration && (expire < mutt_date_epoch()))
  {
    if (s->flags & MUTT_DISPLAY)
    {
      /* L10N: If the translation of this string is a multi line string, then
         each line should start with "[-- " and end with " --]".
         The "%s/%s" is a MIME type, e.g. "text/plain". */
      snprintf(strbuf, sizeof(strbuf), _("[-- This %s/%s attachment is not included, --]\n[-- and the indicated external source has --]\n[-- expired. --]\n"),
               TYPE(b->parts), b->parts->subtype);
      state_attach_puts(s, strbuf);

      CopyHeaderFlags chflags = CH_DECODE | CH_DISPLAY;
      if (C_Weed)
        chflags |= CH_WEED | CH_REORDER;

      mutt_copy_hdr(s->fp_in, s->fp_out, ftello(s->fp_in), b->parts->offset,
                    chflags, NULL, 0);
    }
  }
  else
  {
    if (s->flags & MUTT_DISPLAY)
    {
      /* L10N: If the translation of this string is a multi line string, then
         each line should start with "[-- " and end with " --]".
         The "%s/%s" is a MIME type, e.g. "text/plain".  The %s after
         access-type is an access-type as defined by the MIME RFCs, e.g. "FTP",
         "LOCAL-FILE", "MAIL-SERVER". */
      snprintf(strbuf, sizeof(strbuf), _("[-- This %s/%s attachment is not included, --]\n[-- and the indicated access-type %s is unsupported --]\n"),
               TYPE(b->parts), b->parts->subtype, access_type);
      state_attach_puts(s, strbuf);

      CopyHeaderFlags chflags = CH_DECODE | CH_DISPLAY;
      if (C_Weed)
        chflags |= CH_WEED | CH_REORDER;

      mutt_copy_hdr(s->fp_in, s->fp_out, ftello(s->fp_in), b->parts->offset,
                    chflags, NULL, 0);
    }
  }

  return 0;
}

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alternative_handler()

static int alternative_handler ( struct Body *  a, struct State *  s  )

static

Handler for multipart alternative emails - Implements handler_t.

Definition at line 923 of file handler.c.

{
  struct Body *choice = NULL;
  struct Body *b = NULL;
  bool mustfree = false;
  int rc = 0;

  if ((a->encoding == ENC_BASE64) || (a->encoding == ENC_QUOTED_PRINTABLE) ||
      (a->encoding == ENC_UUENCODED))
  {
    struct stat st;
    mustfree = true;
    fstat(fileno(s->fp_in), &st);
    b = mutt_body_new();
    b->length = (long) st.st_size;
    b->parts =
        mutt_parse_multipart(s->fp_in, mutt_param_get(&a->parameter, "boundary"),
                             (long) st.st_size, mutt_istr_equal("digest", a->subtype));
  }
  else
    b = a;

  a = b;

  /* First, search list of preferred types */
  struct ListNode *np = NULL;
  STAILQ_FOREACH(np, &AlternativeOrderList, entries)
  {
    int btlen; /* length of basetype */
    bool wild; /* do we have a wildcard to match all subtypes? */

    char *c = strchr(np->data, '/');
    if (c)
    {
      wild = ((c[1] == '*') && (c[2] == '\0'));
      btlen = c - np->data;
    }
    else
    {
      wild = true;
      btlen = mutt_str_len(np->data);
    }

    if (a->parts)
      b = a->parts;
    else
      b = a;
    while (b)
    {
      const char *bt = TYPE(b);
      if (mutt_istrn_equal(bt, np->data, btlen) && (bt[btlen] == 0))
      {
        /* the basetype matches */
        if (wild || mutt_istr_equal(np->data + btlen + 1, b->subtype))
        {
          choice = b;
        }
      }
      b = b->next;
    }

    if (choice)
      break;
  }

  /* Next, look for an autoviewable type */
  if (!choice)
  {
    if (a->parts)
      b = a->parts;
    else
      b = a;
    while (b)
    {
      if (is_autoview(b))
        choice = b;
      b = b->next;
    }
  }

  /* Then, look for a text entry */
  if (!choice)
  {
    if (a->parts)
      b = a->parts;
    else
      b = a;
    int type = 0;
    while (b)
    {
      if (b->type == TYPE_TEXT)
      {
        if (mutt_istr_equal("plain", b->subtype) && (type <= TXT_PLAIN))
        {
          choice = b;
          type = TXT_PLAIN;
        }
        else if (mutt_istr_equal("enriched", b->subtype) && (type <= TXT_ENRICHED))
        {
          choice = b;
          type = TXT_ENRICHED;
        }
        else if (mutt_istr_equal("html", b->subtype) && (type <= TXT_HTML))
        {
          choice = b;
          type = TXT_HTML;
        }
      }
      b = b->next;
    }
  }

  /* Finally, look for other possibilities */
  if (!choice)
  {
    if (a->parts)
      b = a->parts;
    else
      b = a;
    while (b)
    {
      if (mutt_can_decode(b))
        choice = b;
      b = b->next;
    }
  }

  if (choice)
  {
    if (s->flags & MUTT_DISPLAY && !C_Weed)
    {
      fseeko(s->fp_in, choice->hdr_offset, SEEK_SET);
      mutt_file_copy_bytes(s->fp_in, s->fp_out, choice->offset - choice->hdr_offset);
    }

    if (mutt_str_equal("info", C_ShowMultipartAlternative))
    {
      print_part_line(s, choice, 0);
    }
    mutt_body_handler(choice, s);

    if (mutt_str_equal("info", C_ShowMultipartAlternative))
    {
      if (a->parts)
        b = a->parts;
      else
        b = a;
      int count = 0;
      while (b)
      {
        if (choice != b)
        {
          count += 1;
          if (count == 1)
            state_putc(s, '\n');

          print_part_line(s, b, count);
        }
        b = b->next;
      }
    }
  }
  else if (s->flags & MUTT_DISPLAY)
  {
    /* didn't find anything that we could display! */
    state_mark_attach(s);
    state_puts(s, _("[-- Error:  Could not display any parts of "
                    "Multipart/Alternative --]\n"));
    rc = -1;
  }

  if (mustfree)
    mutt_body_free(&a);

  return rc;
}

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multilingual_handler()

static int multilingual_handler ( struct Body *  a, struct State *  s  )

static

Handler for multi-lingual emails - Implements handler_t.

Return values

0

Always

Definition at line 1104 of file handler.c.

{
  struct Body *b = NULL;
  bool mustfree = false;
  int rc = 0;

  mutt_debug(LL_DEBUG2,
             "RFC8255 >> entering in handler multilingual handler\n");
  if ((a->encoding == ENC_BASE64) || (a->encoding == ENC_QUOTED_PRINTABLE) ||
      (a->encoding == ENC_UUENCODED))
  {
    struct stat st;
    mustfree = true;
    fstat(fileno(s->fp_in), &st);
    b = mutt_body_new();
    b->length = (long) st.st_size;
    b->parts =
        mutt_parse_multipart(s->fp_in, mutt_param_get(&a->parameter, "boundary"),
                             (long) st.st_size, mutt_istr_equal("digest", a->subtype));
  }
  else
    b = a;

  a = b;

  if (a->parts)
    b = a->parts;
  else
    b = a;

  struct Body *choice = NULL;
  struct Body *first_part = NULL;
  struct Body *zxx_part = NULL;
  struct ListNode *np = NULL;

  if (C_PreferredLanguages)
  {
    struct Buffer *langs = mutt_buffer_pool_get();
    cs_subset_str_string_get(NeoMutt->sub, "preferred_languages", langs);
    mutt_debug(LL_DEBUG2, "RFC8255 >> preferred_languages set in config to '%s'\n",
               mutt_b2s(langs));
    mutt_buffer_pool_release(&langs);

    STAILQ_FOREACH(np, &C_PreferredLanguages->head, entries)
    {
      while (b)
      {
        if (mutt_can_decode(b))
        {
          if (!first_part)
            first_part = b;

          if (b->language && mutt_str_equal("zxx", b->language))
            zxx_part = b;

          mutt_debug(LL_DEBUG2, "RFC8255 >> comparing configuration preferred_language='%s' to mail part content-language='%s'\n",
                     np->data, b->language);
          if (b->language && mutt_str_equal(np->data, b->language))
          {
            mutt_debug(LL_DEBUG2, "RFC8255 >> preferred_language='%s' matches content-language='%s' >> part selected to be displayed\n",
                       np->data, b->language);
            choice = b;
            break;
          }
        }

        b = b->next;
      }

      if (choice)
        break;

      if (a->parts)
        b = a->parts;
      else
        b = a;
    }
  }

  if (choice)
    mutt_body_handler(choice, s);
  else
  {
    if (zxx_part)
      mutt_body_handler(zxx_part, s);
    else
      mutt_body_handler(first_part, s);
  }

  if (mustfree)
    mutt_body_free(&a);

  return rc;
}

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multipart_handler()

static int multipart_handler ( struct Body *  a, struct State *  s  )

static

Handler for multipart emails - Implements handler_t.

Definition at line 1202 of file handler.c.

{
  struct Body *b = NULL, *p = NULL;
  struct stat st;
  int count;
  int rc = 0;

  if ((a->encoding == ENC_BASE64) || (a->encoding == ENC_QUOTED_PRINTABLE) ||
      (a->encoding == ENC_UUENCODED))
  {
    fstat(fileno(s->fp_in), &st);
    b = mutt_body_new();
    b->length = (long) st.st_size;
    b->parts =
        mutt_parse_multipart(s->fp_in, mutt_param_get(&a->parameter, "boundary"),
                             (long) st.st_size, mutt_istr_equal("digest", a->subtype));
  }
  else
    b = a;

  for (p = b->parts, count = 1; p; p = p->next, count++)
  {
    if (s->flags & MUTT_DISPLAY)
    {
      state_mark_attach(s);
      if (p->description || p->filename || p->form_name)
      {
        /* L10N: %s is the attachment description, filename or form_name. */
        state_printf(s, _("[-- Attachment #%d: %s --]\n"), count,
                     p->description ? p->description :
                                      p->filename ? p->filename : p->form_name);
      }
      else
        state_printf(s, _("[-- Attachment #%d --]\n"), count);
      print_part_line(s, p, 0);
      if (C_Weed)
      {
        state_putc(s, '\n');
      }
      else
      {
        fseeko(s->fp_in, p->hdr_offset, SEEK_SET);
        mutt_file_copy_bytes(s->fp_in, s->fp_out, p->offset - p->hdr_offset);
      }
    }

    rc = mutt_body_handler(p, s);
    state_putc(s, '\n');

    if (rc != 0)
    {
      mutt_error(_("One or more parts of this message could not be displayed"));
      mutt_debug(LL_DEBUG1, "Failed on attachment #%d, type %s/%s\n", count,
                 TYPE(p), NONULL(p->subtype));
    }

    if ((s->flags & MUTT_REPLYING) && C_IncludeOnlyfirst && (s->flags & MUTT_FIRSTDONE))
    {
      break;
    }
  }

  if ((a->encoding == ENC_BASE64) || (a->encoding == ENC_QUOTED_PRINTABLE) ||
      (a->encoding == ENC_UUENCODED))
  {
    mutt_body_free(&b);
  }

  /* make failure of a single part non-fatal */
  if (rc < 0)
    rc = 1;
  return rc;
}

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run_decode_and_handler()

static int run_decode_and_handler ( struct Body *  b, struct State *  s, handler_t  handler, bool  plaintext  )

static

Run an appropriate decoder for an email.

Parameters

b	Body of the email
s	State to work with
handler	Callback function to process the content - Implements handler_t
plaintext	Is the content in plain text

Return values

0	Success
-1	Error

Definition at line 1285 of file handler.c.

{
  char *save_prefix = NULL;
  FILE *fp = NULL;
  size_t tmplength = 0;
  LOFF_T tmpoffset = 0;
  int decode = 0;
  int rc = 0;
#ifndef USE_FMEMOPEN
  struct Buffer *tempfile = NULL;
#endif

  fseeko(s->fp_in, b->offset, SEEK_SET);

#ifdef USE_FMEMOPEN
  char *temp = NULL;
  size_t tempsize = 0;
#endif

  /* see if we need to decode this part before processing it */
  if ((b->encoding == ENC_BASE64) || (b->encoding == ENC_QUOTED_PRINTABLE) ||
      (b->encoding == ENC_UUENCODED) || (plaintext || mutt_is_text_part(b)))
  /* text subtypes may require character set conversion even with 8bit encoding */
  {
    const int orig_type = b->type;
    if (!plaintext)
    {
      /* decode to a tempfile, saving the original destination */
      fp = s->fp_out;
#ifdef USE_FMEMOPEN
      s->fp_out = open_memstream(&temp, &tempsize);
      if (!s->fp_out)
      {
        mutt_error(_("Unable to open 'memory stream'"));
        mutt_debug(LL_DEBUG1, "Can't open 'memory stream'\n");
        return -1;
      }
#else
      tempfile = mutt_buffer_pool_get();
      mutt_buffer_mktemp(tempfile);
      s->fp_out = mutt_file_fopen(mutt_b2s(tempfile), "w");
      if (!s->fp_out)
      {
        mutt_error(_("Unable to open temporary file"));
        mutt_debug(LL_DEBUG1, "Can't open %s\n", mutt_b2s(tempfile));
        mutt_buffer_pool_release(&tempfile);
        return -1;
      }
#endif
      /* decoding the attachment changes the size and offset, so save a copy
       * of the "real" values now, and restore them after processing */
      tmplength = b->length;
      tmpoffset = b->offset;

      /* if we are decoding binary bodies, we don't want to prefix each
       * line with the prefix or else the data will get corrupted.  */
      save_prefix = s->prefix;
      s->prefix = NULL;

      decode = 1;
    }
    else
      b->type = TYPE_TEXT;

    mutt_decode_attachment(b, s);

    if (decode)
    {
      b->length = ftello(s->fp_out);
      b->offset = 0;
#ifdef USE_FMEMOPEN
      /* When running under torify, mutt_file_fclose(&s->fp_out) does not seem to
       * update tempsize. On the other hand, fflush does.  See
       * https://github.com/neomutt/neomutt/issues/440 */
      fflush(s->fp_out);
#endif
      mutt_file_fclose(&s->fp_out);

      /* restore final destination and substitute the tempfile for input */
      s->fp_out = fp;
      fp = s->fp_in;
#ifdef USE_FMEMOPEN
      if (tempsize)
      {
        s->fp_in = fmemopen(temp, tempsize, "r");
      }
      else
      { /* fmemopen can't handle zero-length buffers */
        s->fp_in = mutt_file_fopen("/dev/null", "r");
      }
      if (!s->fp_in)
      {
        mutt_perror(_("failed to re-open 'memory stream'"));
        FREE(&temp);
        return -1;
      }
#else
      s->fp_in = fopen(mutt_b2s(tempfile), "r");
      unlink(mutt_b2s(tempfile));
      mutt_buffer_pool_release(&tempfile);
#endif
      /* restore the prefix */
      s->prefix = save_prefix;
    }

    b->type = orig_type;
  }

  /* process the (decoded) body part */
  if (handler)
  {
    rc = handler(b, s);
    if (rc != 0)
    {
      mutt_debug(LL_DEBUG1, "Failed on attachment of type %s/%s\n", TYPE(b),
                 NONULL(b->subtype));
    }

    if (decode)
    {
      b->length = tmplength;
      b->offset = tmpoffset;

      /* restore the original source stream */
      mutt_file_fclose(&s->fp_in);
      s->fp_in = fp;
    }
  }
  s->flags |= MUTT_FIRSTDONE;
#ifdef USE_FMEMOPEN
  FREE(&temp);
#endif

  return rc;
}

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valid_pgp_encrypted_handler()

static int valid_pgp_encrypted_handler ( struct Body *  b, struct State *  s  )

static

Handler for valid pgp-encrypted emails - Implements handler_t.

Definition at line 1425 of file handler.c.

{
  struct Body *octetstream = b->parts->next;

  /* clear out any mime headers before the handler, so they can't be spoofed. */
  mutt_env_free(&b->mime_headers);
  mutt_env_free(&octetstream->mime_headers);

  int rc;
  /* Some clients improperly encode the octetstream part. */
  if (octetstream->encoding != ENC_7BIT)
    rc = run_decode_and_handler(octetstream, s, crypt_pgp_encrypted_handler, 0);
  else
    rc = crypt_pgp_encrypted_handler(octetstream, s);
  b->goodsig |= octetstream->goodsig;

  /* Relocate protected headers onto the multipart/encrypted part */
  if (!rc && octetstream->mime_headers)
  {
    b->mime_headers = octetstream->mime_headers;
    octetstream->mime_headers = NULL;
  }

  return rc;
}

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malformed_pgp_encrypted_handler()

static int malformed_pgp_encrypted_handler ( struct Body *  b, struct State *  s  )

static

Handler for invalid pgp-encrypted emails - Implements handler_t.

Definition at line 1454 of file handler.c.

{
  struct Body *octetstream = b->parts->next->next;

  /* clear out any mime headers before the handler, so they can't be spoofed. */
  mutt_env_free(&b->mime_headers);
  mutt_env_free(&octetstream->mime_headers);

  /* exchange encodes the octet-stream, so re-run it through the decoder */
  int rc = run_decode_and_handler(octetstream, s, crypt_pgp_encrypted_handler, false);
  b->goodsig |= octetstream->goodsig;
#ifdef USE_AUTOCRYPT
  b->is_autocrypt |= octetstream->is_autocrypt;
#endif

  /* Relocate protected headers onto the multipart/encrypted part */
  if (!rc && octetstream->mime_headers)
  {
    b->mime_headers = octetstream->mime_headers;
    octetstream->mime_headers = NULL;
  }

  return rc;
}

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mutt_decode_base64()

void mutt_decode_base64	(	struct State *	s,
		size_t	len,
		bool	istext,
		iconv_t	cd
	)

Decode base64-encoded text.

Parameters

s	State to work with
len	Length of text to decode
istext	Mime part is plain text
cd	Iconv conversion descriptor

Definition at line 1486 of file handler.c.

{
  char buf[5];
  int ch, i;
  bool cr = false;
  char bufi[BUFI_SIZE];
  size_t l = 0;

  buf[4] = '\0';

  if (istext)
    state_set_prefix(s);

  while (len > 0)
  {
    for (i = 0; (i < 4) && (len > 0); len--)
    {
      ch = fgetc(s->fp_in);
      if (ch == EOF)
        break;
      if ((ch >= 0) && (ch < 128) && ((base64val(ch) != -1) || (ch == '=')))
        buf[i++] = ch;
    }
    if (i != 4)
    {
      /* "i" may be zero if there is trailing whitespace, which is not an error */
      if (i != 0)
        mutt_debug(LL_DEBUG2, "didn't get a multiple of 4 chars\n");
      break;
    }

    const int c1 = base64val(buf[0]);
    const int c2 = base64val(buf[1]);

    /* first char */
    ch = (c1 << 2) | (c2 >> 4);

    if (cr && (ch != '\n'))
      bufi[l++] = '\r';

    cr = false;

    if (istext && (ch == '\r'))
      cr = true;
    else
      bufi[l++] = ch;

    /* second char */
    if (buf[2] == '=')
      break;
    const int c3 = base64val(buf[2]);
    ch = ((c2 & 0xf) << 4) | (c3 >> 2);

    if (cr && (ch != '\n'))
      bufi[l++] = '\r';

    cr = false;

    if (istext && (ch == '\r'))
      cr = true;
    else
      bufi[l++] = ch;

    /* third char */
    if (buf[3] == '=')
      break;
    const int c4 = base64val(buf[3]);
    ch = ((c3 & 0x3) << 6) | c4;

    if (cr && (ch != '\n'))
      bufi[l++] = '\r';

    cr = false;

    if (istext && (ch == '\r'))
      cr = true;
    else
      bufi[l++] = ch;

    if ((l + 8) >= sizeof(bufi))
      convert_to_state(cd, bufi, &l, s);
  }

  if (cr)
    bufi[l++] = '\r';

  convert_to_state(cd, bufi, &l, s);
  convert_to_state(cd, 0, 0, s);

  state_reset_prefix(s);
}

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mutt_body_handler()

int mutt_body_handler	(	struct Body *	b,
		struct State *	s
	)

Handler for the Body of an email.

Parameters

b	Body of the email
s	State to work with

Return values

0	Success
-1	Error

Definition at line 1585 of file handler.c.

{
  if (!b || !s)
    return -1;

  bool plaintext = false;
  handler_t handler = NULL;
  handler_t encrypted_handler = NULL;
  int rc = 0;
  static unsigned short recurse_level = 0;

  int oflags = s->flags;

  if (recurse_level >= 100)
  {
    mutt_debug(LL_DEBUG1, "recurse level too deep. giving up.\n");
    return -1;
  }
  recurse_level++;

  /* first determine which handler to use to process this part */

  if (is_autoview(b))
  {
    handler = autoview_handler;
    s->flags &= ~MUTT_CHARCONV;
  }
  else if (b->type == TYPE_TEXT)
  {
    if (mutt_istr_equal("plain", b->subtype))
    {
      /* avoid copying this part twice since removing the transfer-encoding is
       * the only operation needed.  */
      if (((WithCrypto & APPLICATION_PGP) != 0) && mutt_is_application_pgp(b))
      {
        encrypted_handler = crypt_pgp_application_handler;
        handler = encrypted_handler;
      }
      else if (C_ReflowText && mutt_istr_equal("flowed", mutt_param_get(&b->parameter, "format")))
      {
        handler = rfc3676_handler;
      }
      else
      {
        handler = text_plain_handler;
      }
    }
    else if (mutt_istr_equal("enriched", b->subtype))
      handler = text_enriched_handler;
    else /* text body type without a handler */
      plaintext = false;
  }
  else if (b->type == TYPE_MESSAGE)
  {
    if (mutt_is_message_type(b->type, b->subtype))
      handler = message_handler;
    else if (mutt_istr_equal("delivery-status", b->subtype))
      plaintext = true;
    else if (mutt_istr_equal("external-body", b->subtype))
      handler = external_body_handler;
  }
  else if (b->type == TYPE_MULTIPART)
  {
    if (!mutt_str_equal("inline", C_ShowMultipartAlternative) &&
        mutt_istr_equal("alternative", b->subtype))
    {
      handler = alternative_handler;
    }
    else if (!mutt_str_equal("inline", C_ShowMultipartAlternative) &&
             mutt_istr_equal("multilingual", b->subtype))
    {
      handler = multilingual_handler;
    }
    else if ((WithCrypto != 0) && mutt_istr_equal("signed", b->subtype))
    {
      if (!mutt_param_get(&b->parameter, "protocol"))
        mutt_error(_("Error: multipart/signed has no protocol"));
      else if (s->flags & MUTT_VERIFY)
        handler = mutt_signed_handler;
    }
    else if (mutt_is_valid_multipart_pgp_encrypted(b))
    {
      encrypted_handler = valid_pgp_encrypted_handler;
      handler = encrypted_handler;
    }
    else if (mutt_is_malformed_multipart_pgp_encrypted(b))
    {
      encrypted_handler = malformed_pgp_encrypted_handler;
      handler = encrypted_handler;
    }

    if (!handler)
      handler = multipart_handler;

    if ((b->encoding != ENC_7BIT) && (b->encoding != ENC_8BIT) && (b->encoding != ENC_BINARY))
    {
      mutt_debug(LL_DEBUG1, "Bad encoding type %d for multipart entity, assuming 7 bit\n",
                 b->encoding);
      b->encoding = ENC_7BIT;
    }
  }
  else if ((WithCrypto != 0) && (b->type == TYPE_APPLICATION))
  {
    if (OptDontHandlePgpKeys && mutt_istr_equal("pgp-keys", b->subtype))
    {
      /* pass raw part through for key extraction */
      plaintext = true;
    }
    else if (((WithCrypto & APPLICATION_PGP) != 0) && mutt_is_application_pgp(b))
    {
      encrypted_handler = crypt_pgp_application_handler;
      handler = encrypted_handler;
    }
    else if (((WithCrypto & APPLICATION_SMIME) != 0) && mutt_is_application_smime(b))
    {
      encrypted_handler = crypt_smime_application_handler;
      handler = encrypted_handler;
    }
  }

  /* only respect disposition == attachment if we're not
   * displaying from the attachment menu (i.e. pager) */
  if ((!C_HonorDisposition || ((b->disposition != DISP_ATTACH) || OptViewAttach)) &&
      (plaintext || handler))
  {
    /* Prevent encrypted attachments from being included in replies
     * unless $include_encrypted is set. */
    if ((s->flags & MUTT_REPLYING) && (s->flags & MUTT_FIRSTDONE) &&
        encrypted_handler && !C_IncludeEncrypted)
    {
      goto cleanup;
    }

    rc = run_decode_and_handler(b, s, handler, plaintext);
  }
  /* print hint to use attachment menu for disposition == attachment
   * if we're not already being called from there */
  else if (s->flags & MUTT_DISPLAY)
  {
    struct Buffer msg = mutt_buffer_make(256);

    if (!OptViewAttach)
    {
      char keystroke[128] = { 0 };
      if (km_expand_key(keystroke, sizeof(keystroke),
                        km_find_func(MENU_PAGER, OP_VIEW_ATTACHMENTS)))
      {
        if (C_HonorDisposition && (b->disposition == DISP_ATTACH))
        {
          /* L10N: %s expands to a keystroke/key binding, e.g. 'v'.  */
          mutt_buffer_printf(&msg, _("[-- This is an attachment (use '%s' to view this part) --]\n"),
                             keystroke);
        }
        else
        {
          /* L10N: %s/%s is a MIME type, e.g. "text/plain".
             The last %s expands to a keystroke/key binding, e.g. 'v'. */
          mutt_buffer_printf(&msg, _("[-- %s/%s is unsupported (use '%s' to view this part) --]\n"),
                             TYPE(b), b->subtype, keystroke);
        }
      }
      else
      {
        if (C_HonorDisposition && (b->disposition == DISP_ATTACH))
        {
          mutt_buffer_strcpy(&msg, _("[-- This is an attachment (need "
                                     "'view-attachments' bound to key) --]\n"));
        }
        else
        {
          /* L10N: %s/%s is a MIME type, e.g. "text/plain". */
          mutt_buffer_printf(&msg, _("[-- %s/%s is unsupported (need 'view-attachments' bound to key) --]\n"),
                             TYPE(b), b->subtype);
        }
      }
    }
    else
    {
      if (C_HonorDisposition && (b->disposition == DISP_ATTACH))
      {
        mutt_buffer_strcpy(&msg, _("[-- This is an attachment --]\n"));
      }
      else
      {
        /* L10N: %s/%s is a MIME type, e.g. "text/plain". */
        mutt_buffer_printf(&msg, _("[-- %s/%s is unsupported --]\n"), TYPE(b), b->subtype);
      }
    }
    state_mark_attach(s);
    state_printf(s, "%s", mutt_b2s(&msg));
    mutt_buffer_dealloc(&msg);
  }

cleanup:
  recurse_level--;
  s->flags = oflags | (s->flags & MUTT_FIRSTDONE);
  if (rc != 0)
  {
    mutt_debug(LL_DEBUG1, "Bailing on attachment of type %s/%s\n", TYPE(b),
               NONULL(b->subtype));
  }

  return rc;
}

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mutt_can_decode()

bool mutt_can_decode

(

struct Body *

a

)

Will decoding the attachment produce any output.

Parameters

a	Body of email to test

Return values

true	Decoding the attachment will produce output

Definition at line 1795 of file handler.c.

{
  if (is_autoview(a))
    return true;
  if (a->type == TYPE_TEXT)
    return true;
  if (a->type == TYPE_MESSAGE)
    return true;
  if (a->type == TYPE_MULTIPART)
  {
    if (WithCrypto)
    {
      if (mutt_istr_equal(a->subtype, "signed") || mutt_istr_equal(a->subtype, "encrypted"))
      {
        return true;
      }
    }

    for (struct Body *b = a->parts; b; b = b->next)
    {
      if (mutt_can_decode(b))
        return true;
    }
  }
  else if ((WithCrypto != 0) && (a->type == TYPE_APPLICATION))
  {
    if (((WithCrypto & APPLICATION_PGP) != 0) && mutt_is_application_pgp(a))
      return true;
    if (((WithCrypto & APPLICATION_SMIME) != 0) && mutt_is_application_smime(a))
      return true;
  }

  return false;
}

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mutt_decode_attachment()

void mutt_decode_attachment	(	struct Body *	b,
		struct State *	s
	)

Decode an email's attachment.

Parameters

b	Body of the email
s	State of text being processed

Definition at line 1835 of file handler.c.

{
  int istext = mutt_is_text_part(b) && (b->disposition == DISP_INLINE);
  iconv_t cd = (iconv_t)(-1);

  if (istext && (b->charset || (s->flags & MUTT_CHARCONV)))
  {
    const char *charset = b->charset;
    if (!charset)
    {
      charset = mutt_param_get(&b->parameter, "charset");
      if (!charset && C_AssumedCharset)
        charset = mutt_ch_get_default_charset();
    }
    if (charset && C_Charset)
      cd = mutt_ch_iconv_open(C_Charset, charset, MUTT_ICONV_HOOK_FROM);
  }

  fseeko(s->fp_in, b->offset, SEEK_SET);
  switch (b->encoding)
  {
    case ENC_QUOTED_PRINTABLE:
      decode_quoted(s, b->length,
                    istext || (((WithCrypto & APPLICATION_PGP) != 0) &&
                               mutt_is_application_pgp(b)),
                    cd);
      break;
    case ENC_BASE64:
      mutt_decode_base64(s, b->length,
                         istext || (((WithCrypto & APPLICATION_PGP) != 0) &&
                                    mutt_is_application_pgp(b)),
                         cd);
      break;
    case ENC_UUENCODED:
      decode_uuencoded(s, b->length,
                       istext || (((WithCrypto & APPLICATION_PGP) != 0) &&
                                  mutt_is_application_pgp(b)),
                       cd);
      break;
    default:
      decode_xbit(s, b->length,
                  istext || (((WithCrypto & APPLICATION_PGP) != 0) &&
                             mutt_is_application_pgp(b)),
                  cd);
      break;
  }

  if (cd != (iconv_t)(-1))
    iconv_close(cd);
}

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Variable Documentation

C_HonorDisposition

bool C_HonorDisposition

Config: Don't display MIME parts inline if they have a disposition of 'attachment'.

Definition at line 64 of file handler.c.

C_ImplicitAutoview

bool C_ImplicitAutoview

Config: Display MIME attachments inline if a 'copiousoutput' mailcap entry exists.

Definition at line 65 of file handler.c.

C_IncludeEncrypted

bool C_IncludeEncrypted

Config: Whether to include encrypted content when replying.

Definition at line 66 of file handler.c.

C_IncludeOnlyfirst

bool C_IncludeOnlyfirst

Config: Only include the first attachment when replying.

Definition at line 67 of file handler.c.

C_PreferredLanguages

struct Slist* C_PreferredLanguages

Config: Preferred languages for multilingual MIME.

Definition at line 68 of file handler.c.

C_ReflowText

bool C_ReflowText

Config: Reformat paragraphs of 'format=flowed' text.

Definition at line 69 of file handler.c.

C_ShowMultipartAlternative

char* C_ShowMultipartAlternative

Config: How to display 'multipart/alternative' MIME parts.

Definition at line 70 of file handler.c.