postpone.c

mutt-1.5.12 源代码。linux 下邮件接受的工具。

      hdr->security |= APPLICATION_SMIME;
       
      /* remove the smime field */
      next = tmp->next;
      if (last)
	last->next = tmp->next;
      else
	hdr->env->userhdrs = tmp->next;
      tmp->next = NULL;
      mutt_free_list (&tmp);
      tmp = next;
    }

#ifdef MIXMASTER
    else if (mutt_strncmp ("X-Mutt-Mix:", tmp->data, 11) == 0)
    {
      char *t;
      mutt_free_list (&hdr->chain);
      
      t = strtok (tmp->data + 11, " \t\n");
      while (t)
      {
	hdr->chain = mutt_add_list (hdr->chain, t);
	t = strtok (NULL, " \t\n");
      }
      
      next = tmp->next;
      if (last) 
	last->next = tmp->next;
      else
	hdr->env->userhdrs = tmp->next;
      tmp->next = NULL;
      mutt_free_list (&tmp);
      tmp = next;
    }
#endif

    else
    {
      last = tmp;
      tmp = tmp->next;
    }
  }
  return (code);
}



int mutt_parse_crypt_hdr (char *p, int set_signas, int crypt_app)
{
  char smime_cryptalg[LONG_STRING] = "\0";
  char sign_as[LONG_STRING] = "\0", *q;
  int flags = 0;

  if (!WithCrypto)
    return 0;
   
  SKIPWS (p);
  for (; *p; p++)
  {    
     
    switch (*p)
    {
      case 'e':
      case 'E':
        flags |= ENCRYPT;
        break;

      case 's':    
      case 'S':
        flags |= SIGN;
        q = sign_as;
      
        if (*(p+1) == '<')
        {
          for (p += 2; 
	       *p && *p != '>' && q < sign_as + sizeof (sign_as) - 1;
               *q++ = *p++)
	    ;

          if (*p!='>')
          {
            mutt_error _("Illegal crypto header");
            return 0;
          }
        }
       
        *q = '\0';
        break;

      /* This used to be the micalg parameter.
       * 
       * It's no longer needed, so we just skip the parameter in order
       * to be able to recall old messages.
       */
      case 'm':
      case 'M':
        if(*(p+1) == '<')
        {
	  for (p += 2; *p && *p != '>'; p++)
	    ;
	  if(*p != '>')
	  {
	    mutt_error _("Illegal crypto header");
	    return 0;
	  }
	}

	break;
	  
	  
      case 'c':
      case 'C':
   	q = smime_cryptalg;
	
        if(*(p+1) == '<')
	{
	  for(p += 2; *p && *p != '>' && q < smime_cryptalg + sizeof(smime_cryptalg) - 1;
	      *q++ = *p++)
	    ;
	  
	  if(*p != '>')
	  {
	    mutt_error _("Illegal S/MIME header");
	    return 0;
	  }
	}

	*q = '\0';
	break;

      case 'i':
      case 'I':
	flags |= INLINE;
	break;

      default:
        mutt_error _("Illegal crypto header");
        return 0;
    }
     
  }

  /* the cryptalg field must not be empty */
  if ((WithCrypto & APPLICATION_SMIME) && *smime_cryptalg)
    mutt_str_replace (&SmimeCryptAlg, smime_cryptalg);

  /* Set {Smime,Pgp}SignAs, if desired. */

  if ((WithCrypto & APPLICATION_PGP) && (crypt_app == APPLICATION_PGP)
      && (set_signas || *sign_as))
    mutt_str_replace (&PgpSignAs, sign_as);

  if ((WithCrypto & APPLICATION_SMIME) && (crypt_app == APPLICATION_SMIME)
      && (set_signas || *sign_as))
    mutt_str_replace (&SmimeDefaultKey, sign_as);

  return flags;
}



int mutt_prepare_template (FILE *fp, CONTEXT *ctx, HEADER *newhdr, HEADER *hdr,
			       short weed)
{
  MESSAGE *msg = NULL;
  char file[_POSIX_PATH_MAX];
  BODY *b;
  FILE *bfp;
  
  int rv = -1;
  STATE s;
  
  memset (&s, 0, sizeof (s));
  
  if (!fp && (msg = mx_open_message (ctx, hdr->msgno)) == NULL)
    return (-1);

  if (!fp) fp = msg->fp;

  bfp = fp;

  /* parse the message header and MIME structure */

  fseeko (fp, hdr->offset, 0);
  newhdr->offset = hdr->offset;
  newhdr->env = mutt_read_rfc822_header (fp, newhdr, 1, weed);
  newhdr->content->length = hdr->content->length;
  mutt_parse_part (fp, newhdr->content);

  FREE (&newhdr->env->message_id);
  FREE (&newhdr->env->mail_followup_to); /* really? */

  /* decrypt pgp/mime encoded messages */

  if ((WithCrypto & (APPLICATION_PGP|APPLICATION_SMIME) & hdr->security)
      && mutt_is_multipart_encrypted (newhdr->content))
  {
    int ccap = WithCrypto & (APPLICATION_PGP|APPLICATION_SMIME) & hdr->security;
    newhdr->security |= ENCRYPT | ccap;
    if (!crypt_valid_passphrase (ccap))
      goto err;

    mutt_message _("Decrypting message...");
    if (((ccap & APPLICATION_PGP) && crypt_pgp_decrypt_mime (fp, &bfp, newhdr->content, &b) == -1) 
	|| ((ccap & APPLICATION_SMIME) && crypt_smime_decrypt_mime (fp, &bfp, newhdr->content, &b) == -1) 
	|| b == NULL)
    {
 err:
      mx_close_message (&msg);
      mutt_free_envelope (&newhdr->env);
      mutt_free_body (&newhdr->content);
      mutt_error _("Decryption failed.");
      return -1;
    }

    mutt_free_body (&newhdr->content);
    newhdr->content = b;

    mutt_clear_error ();
  }

  /* 
   * remove a potential multipart/signed layer - useful when
   * resending messages 
   */
  
  if (WithCrypto && mutt_is_multipart_signed (newhdr->content))
  {
    newhdr->security |= SIGN;
    if ((WithCrypto & APPLICATION_PGP)
        && ascii_strcasecmp (mutt_get_parameter ("protocol", newhdr->content->parameter), "application/pgp-signature") == 0)
      newhdr->security |= APPLICATION_PGP;
    else if ((WithCrypto & APPLICATION_SMIME))
      newhdr->security |= APPLICATION_SMIME;
    
    /* destroy the signature */
    mutt_free_body (&newhdr->content->parts->next);
    newhdr->content = mutt_remove_multipart (newhdr->content);
  }


  /* 
   * We don't need no primary multipart.
   * Note: We _do_ preserve messages!
   * 
   * XXX - we don't handle multipart/alternative in any 
   * smart way when sending messages.  However, one may
   * consider this a feature.
   * 
   */

  if (newhdr->content->type == TYPEMULTIPART)
    newhdr->content = mutt_remove_multipart (newhdr->content);

  s.fpin = bfp;
  
  /* create temporary files for all attachments */
  for (b = newhdr->content; b; b = b->next)
  {
    
    /* what follows is roughly a receive-mode variant of
     * mutt_get_tmp_attachment () from muttlib.c
     */

    file[0] = '\0';
    if (b->filename)
    {
      strfcpy (file, b->filename, sizeof (file));
      b->d_filename = safe_strdup (b->filename);
    }
    else
    {
      /* avoid Content-Disposition: header with temporary filename */
      b->use_disp = 0;
    }

    /* set up state flags */

    s.flags = 0;

    if (b->type == TYPETEXT)
    {
      if (!ascii_strcasecmp ("yes", mutt_get_parameter ("x-mutt-noconv", b->parameter)))
	b->noconv = 1;
      else
      {
	s.flags |= M_CHARCONV;
	b->noconv = 0;
      }

      mutt_delete_parameter ("x-mutt-noconv", &b->parameter);
    }

    mutt_adv_mktemp (file, sizeof(file));
    if ((s.fpout = safe_fopen (file, "w")) == NULL)
      goto bail;

    
    if ((WithCrypto & APPLICATION_PGP) 
	&& (mutt_is_application_pgp (b) & (ENCRYPT|SIGN)))
    {
      
      mutt_body_handler (b, &s);

      newhdr->security |= mutt_is_application_pgp (newhdr->content);

      b->type = TYPETEXT;
      mutt_str_replace (&b->subtype, "plain");
      mutt_delete_parameter ("x-action", &b->parameter);
    }
    else
      mutt_decode_attachment (b, &s);

    if (safe_fclose (&s.fpout) != 0)
      goto bail;

    mutt_str_replace (&b->filename, file);
    b->unlink = 1;

    mutt_stamp_attachment (b);

    mutt_free_body (&b->parts);
    if (b->hdr) b->hdr->content = NULL; /* avoid dangling pointer */
  }

  /* Fix encryption flags. */
  
  /* No inline if multipart. */
  if (WithCrypto && (newhdr->security & INLINE) && newhdr->content->next)
    newhdr->security &= ~INLINE;
  
  /* Do we even support multiple mechanisms? */
  newhdr->security &= WithCrypto | ~(APPLICATION_PGP|APPLICATION_SMIME);
  
  /* Theoretically, both could be set. Take the one the user wants to set by default. */
  if ((newhdr->security & APPLICATION_PGP) && (newhdr->security & APPLICATION_SMIME))
  {
    if (option (OPTSMIMEISDEFAULT))
      newhdr->security &= ~APPLICATION_PGP;
    else
      newhdr->security &= ~APPLICATION_SMIME;
  }

  rv = 0;
  
  bail:
  
  /* that's it. */
  if (bfp != fp) fclose (bfp);
  if (msg) mx_close_message (&msg);
  
  if (rv == -1)
  {
    mutt_free_envelope (&newhdr->env);
    mutt_free_body (&newhdr->content);
  }
  
  return rv;
}