mtxnt.c

mgcp协议源代码。支持多种编码：g711

  }
}


/* MTX mail fetch flags
 * Accepts: MAIL stream
 *	    sequence
 *	    option flags
 * Sniffs at file to see if some other process changed the flags
 */

void mtx_flags (MAILSTREAM *stream,char *sequence,long flags)
{
  unsigned long i;
  if (mtx_ping (stream) && 	/* ping mailbox, get new status for messages */
      ((flags & FT_UID) ? mail_uid_sequence (stream,sequence) :
       mail_sequence (stream,sequence)))
    for (i = 1; i <= stream->nmsgs; i++) 
      if (mail_elt (stream,i)->sequence) mtx_elt (stream,i);
}

/* MTX mail fetch message header
 * Accepts: MAIL stream
 *	    message # to fetch
 *	    pointer to returned header text length
 *	    option flags
 * Returns: message header in RFC822 format
 */

char *mtx_header (MAILSTREAM *stream,unsigned long msgno,unsigned long *length,
		  long flags)
{
  *length = 0;			/* default to empty */
  if (flags & FT_UID) return "";/* UID call "impossible" */
				/* get to header position */
  lseek (LOCAL->fd,mtx_hdrpos (stream,msgno,length),L_SET);
				/* is buffer big enough? */
  if (*length > LOCAL->buflen) {
    fs_give ((void **) &LOCAL->buf);
    LOCAL->buf = (char *) fs_get ((LOCAL->buflen = *length) + 1);
  }
  LOCAL->buf[*length] = '\0';	/* tie off string */
				/* slurp the data */
  read (LOCAL->fd,LOCAL->buf,*length);
  return LOCAL->buf;
}

/* MTX mail fetch message text (body only)
 * Accepts: MAIL stream
 *	    message # to fetch
 *	    pointer to returned header text length
 *	    option flags
 * Returns: T, always
 */

long mtx_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
{
  unsigned long i,j;
  MESSAGECACHE *elt;
				/* UID call "impossible" */
  if (flags & FT_UID) return NIL;
  elt = mtx_elt (stream,msgno);	/* get message status */
				/* if message not seen */
  if (!(flags & FT_PEEK) && !elt->seen) {
    elt->seen = T;		/* mark message as seen */
				/* recalculate status */
    mtx_update_status (stream,msgno,T);
    mm_flags (stream,msgno);
  }
				/* find header position */
  i = mtx_hdrpos (stream,msgno,&j);
				/* go to text position */
  lseek (LOCAL->fd,i + j,L_SET);
				/* is buffer big enough? */
  if ((i = elt->rfc822_size - j) > LOCAL->buflen) {
    fs_give ((void **) &LOCAL->buf);
    LOCAL->buf = (char *) fs_get ((LOCAL->buflen = i) + 1);
  }
  read (LOCAL->fd,LOCAL->buf,i);/* slurp the data */
  LOCAL->buf[i] = '\0';		/* tie off string */
				/* set up stringstruct */
  INIT (bs,mail_string,LOCAL->buf,i);
  return T;			/* success */
}

/* MTX mail modify flags
 * Accepts: MAIL stream
 *	    sequence
 *	    flag(s)
 *	    option flags
 */

void mtx_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags)
{
  struct stat sbuf;
  if (!stream->rdonly) {	/* make sure the update takes */
    fsync (LOCAL->fd);
    fstat (LOCAL->fd,&sbuf);	/* get current write time */
    LOCAL->filetime = sbuf.st_mtime;
  }
}


/* MTX mail per-message modify flags
 * Accepts: MAIL stream
 *	    message cache element
 */

void mtx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt)
{
  struct stat sbuf;
				/* maybe need to do a checkpoint? */
  if (LOCAL->filetime && !LOCAL->shouldcheck) {
    fstat (LOCAL->fd,&sbuf);	/* get current write time */
    if (LOCAL->filetime < sbuf.st_mtime) LOCAL->shouldcheck = T;
    LOCAL->filetime = 0;	/* don't do this test for any other messages */
  }
				/* recalculate status */
  mtx_update_status (stream,elt->msgno,NIL);
}

/* MTX mail ping mailbox
 * Accepts: MAIL stream
 * Returns: T if stream still alive, NIL if not
 */

long mtx_ping (MAILSTREAM *stream)
{
  unsigned long i = 1;
  long r = T;
  int ld;
  char lock[MAILTMPLEN];
  struct stat sbuf;
  if (stream && LOCAL) {	/* only if stream already open */
    fstat (LOCAL->fd,&sbuf);	/* get current file poop */
    if (LOCAL->filetime && !(LOCAL->mustcheck || LOCAL->shouldcheck) &&
	(LOCAL->filetime < sbuf.st_mtime)) LOCAL->shouldcheck = T;
				/* check for changed message status */
    if (LOCAL->mustcheck || LOCAL->shouldcheck) {
      if (LOCAL->shouldcheck)	/* babble when we do this unilaterally */
	mm_notify (stream,"[CHECK] Checking for flag updates",NIL);
      while (i <= stream->nmsgs) mtx_elt (stream,i++);
      LOCAL->mustcheck = LOCAL->shouldcheck = NIL;
    }
				/* get shared parse/append permission */
    if ((sbuf.st_size != LOCAL->filesize) &&
	((ld = lockname (lock,stream->mailbox,LOCK_SH)) >= 0)) {
				/* parse resulting mailbox */
      r = (mtx_parse (stream)) ? T : NIL;
      unlockfd (ld,lock);	/* release shared parse/append permission */
    }
    else if ((sbuf.st_ctime > sbuf.st_atime)||(sbuf.st_ctime > sbuf.st_mtime)){
      struct utimbuf times;	/* whack the times if necessary */
      LOCAL->filetime = times.actime = times.modtime = time (0);
      utime (stream->mailbox,&times);
    }
  }
  return r;			/* return result of the parse */
}


/* MTX mail check mailbox (reparses status too)
 * Accepts: MAIL stream
 */

void mtx_check (MAILSTREAM *stream)
{
				/* mark that a check is desired */
  if (LOCAL) LOCAL->mustcheck = T;
  if (mtx_ping (stream)) mm_log ("Check completed",(long) NIL);
}

/* MTX mail expunge mailbox
 * Accepts: MAIL stream
 */

void mtx_expunge (MAILSTREAM *stream)
{
  struct stat sbuf;
  off_t pos = 0;
  int ld;
  unsigned long i = 1;
  unsigned long j,k,m,recent;
  unsigned long n = 0;
  unsigned long delta = 0;
  char lock[MAILTMPLEN];
  MESSAGECACHE *elt;
				/* do nothing if stream dead */
  if (!mtx_ping (stream)) return;
  if (stream->rdonly) {		/* won't do on readonly files! */
    mm_log ("Expunge ignored on readonly mailbox",WARN);
    return;
  }
  if (LOCAL->filetime && !LOCAL->shouldcheck) {
    fstat (LOCAL->fd,&sbuf);	/* get current write time */
    if (LOCAL->filetime < sbuf.st_mtime) LOCAL->shouldcheck = T;
  }
				/* get exclusive parse/append permission */
  if ((ld = lockname (lock,stream->mailbox,LOCK_EX)) < 0) {
    mm_log ("Unable to lock expunge mailbox",ERROR);
    return;
  }
				/* get exclusive access */
  if (flock (LOCAL->fd,LOCK_EX|LOCK_NB)) {
    flock (LOCAL->fd,LOCK_SH);	/* recover previous lock */
    mm_log("Can't expunge because mailbox is in use by another process",ERROR);
    unlockfd (ld,lock);		/* release exclusive parse/append permission */
    return;
  }

  mm_critical (stream);		/* go critical */
  recent = stream->recent;	/* get recent now that pinged and locked */
  while (i <= stream->nmsgs) {	/* for each message */
    elt = mtx_elt (stream,i);	/* get cache element */
				/* number of bytes to smash or preserve */
    k = elt->private.special.text.size + elt->rfc822_size;
    if (elt->deleted) {		/* if deleted */
      if (elt->recent) --recent;/* if recent, note one less recent message */
      delta += k;		/* number of bytes to delete */
      mail_expunged (stream,i);	/* notify upper levels */
      n++;			/* count up one more expunged message */
    }
    else if (i++ && delta) {	/* preserved message */
				/* first byte to preserve */
      j = elt->private.special.offset;
      do {			/* read from source position */
	m = min (k,LOCAL->buflen);
	lseek (LOCAL->fd,j,L_SET);
	read (LOCAL->fd,LOCAL->buf,m);
	pos = j - delta;	/* write to destination position */
	while (T) {
	  lseek (LOCAL->fd,pos,L_SET);
	  if (write (LOCAL->fd,LOCAL->buf,m) > 0) break;
	  mm_notify (stream,strerror (errno),WARN);
	  mm_diskerror (stream,errno,T);
	}
	pos += m;		/* new position */
	j += m;			/* next chunk, perhaps */
      } while (k -= m);		/* until done */
				/* note the new address of this text */
      elt->private.special.offset -= delta;
    }
				/* preserved but no deleted messages */
    else pos = elt->private.special.offset + k;
  }
  if (n) {			/* truncate file after last message */
    if (pos != (LOCAL->filesize -= delta)) {
      sprintf (LOCAL->buf,"Calculated size mismatch %lu != %lu, delta = %lu",
	       (unsigned long) pos,(unsigned long) LOCAL->filesize,delta);
      mm_log (LOCAL->buf,WARN);
      LOCAL->filesize = pos;	/* fix it then */
    }
    ftruncate (LOCAL->fd,LOCAL->filesize);
    sprintf (LOCAL->buf,"Expunged %lu messages",n);
				/* output the news */
    mm_log (LOCAL->buf,(long) NIL);
  }
  else mm_log ("No messages deleted, so no update needed",(long) NIL);
  fsync (LOCAL->fd);		/* force disk update */
  fstat (LOCAL->fd,&sbuf);	/* get new write time */
  LOCAL->filetime = sbuf.st_mtime;
  mm_nocritical (stream);	/* release critical */
				/* notify upper level of new mailbox size */
  mail_exists (stream,stream->nmsgs);
  mail_recent (stream,recent);
  flock (LOCAL->fd,LOCK_SH);	/* allow sharers again */
  unlockfd (ld,lock);		/* release exclusive parse/append permission */
}

/* MTX mail copy message(s)
 * Accepts: MAIL stream
 *	    sequence
 *	    destination mailbox
 *	    copy options
 * Returns: T if success, NIL if failed
 */

long mtx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
{
  struct stat sbuf;
  struct utimbuf times;
  MESSAGECACHE *elt;
  unsigned long i,j,k;
  long ret = LONGT;
  int fd,ld;
  char file[MAILTMPLEN],lock[MAILTMPLEN];
  mailproxycopy_t pc =
    (mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL);
				/* make sure valid mailbox */
  if (!mtx_isvalid (mailbox,LOCAL->buf)) switch (errno) {
  case ENOENT:			/* no such file? */
    mm_notify (stream,"[TRYCREATE] Must create mailbox before copy",NIL);
    return NIL;
  case 0:			/* merely empty file? */
    break;
  case EINVAL:
    if (pc) return (*pc) (stream,sequence,mailbox,options);
    sprintf (LOCAL->buf,"Invalid MTX-format mailbox name: %.80s",mailbox);
    mm_log (LOCAL->buf,ERROR);
    return NIL;
  default:
    if (pc) return (*pc) (stream,sequence,mailbox,options);
    sprintf (LOCAL->buf,"Not a MTX-format mailbox: %.80s",mailbox);
    mm_log (LOCAL->buf,ERROR);
    return NIL;
  }
  if (!((options & CP_UID) ? mail_uid_sequence (stream,sequence) :
	mail_sequence (stream,sequence))) return NIL;
				/* got file? */
  if ((fd = open (mailboxfile (file,mailbox),O_BINARY|O_RDWR|O_CREAT,
		  S_IREAD|S_IWRITE)) < 0) {
    sprintf (LOCAL->buf,"Unable to open copy mailbox: %.80s",strerror (errno));
    mm_log (LOCAL->buf,ERROR);
    return NIL;
  }
  mm_critical (stream);		/* go critical */
				/* get exclusive parse/append permission */
  if ((ld = lockname (lock,mailbox,LOCK_EX)) < 0) {
    mm_log ("Unable to lock copy mailbox",ERROR);
    return NIL;
  }
  fstat (fd,&sbuf);		/* get current file size */
  lseek (fd,sbuf.st_size,L_SET);/* move to end of file */

				/* for each requested message */
  for (i = 1; ret && (i <= stream->nmsgs); i++) 
    if ((elt = mail_elt (stream,i))->sequence) {
      lseek (LOCAL->fd,elt->private.special.offset,L_SET);
				/* number of bytes to copy */
      k = elt->private.special.text.size + elt->rfc822_size;
      do {			/* read from source position */
	j = min (k,LOCAL->buflen);
	read (LOCAL->fd,LOCAL->buf,j);
	if (write (fd,LOCAL->buf,j) < 0) ret = NIL;
      } while (ret && (k -= j));/* until done */
    }
				/* make sure all the updates take */
  if (!(ret && (ret = !fsync (fd)))) {
    sprintf (LOCAL->buf,"Unable to write message: %s",strerror (errno));
    mm_log (LOCAL->buf,ERROR);
    ftruncate (fd,sbuf.st_size);
  }
  times.actime = sbuf.st_atime;	/* preserve atime and mtime */
  times.modtime = sbuf.st_mtime;
  utime (file,&times);		/* set the times */
  unlockfd (ld,lock);		/* release exclusive parse/append permission */
  close (fd);			/* close the file */
  mm_nocritical (stream);	/* release critical */
				/* delete all requested messages */
  if (ret && (options & CP_MOVE)) {
    for (i = 1; i <= stream->nmsgs; i++)
      if ((elt = mtx_elt (stream,i))->sequence) {
	elt->deleted = T;	/* mark message deleted */
				/* recalculate status */
	mtx_update_status (stream,i,NIL);
      }
    if (!stream->rdonly) {	/* make sure the update takes */
      fsync (LOCAL->fd);
      fstat (LOCAL->fd,&sbuf);	/* get current write time */
      LOCAL->filetime = sbuf.st_mtime;
    }
  }
  return ret;
}

/* MTX mail append message from stringstruct
 * Accepts: MAIL stream
 *	    destination mailbox
 *	    append callback
 *	    data for callback
 * Returns: T if append successful, else NIL
 */

long mtx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
{