tenex.c

mgcp协议源代码。支持多种编码：g711

      }
}


/* Tenex mail fetch flags
 * Accepts: MAIL stream
 *	    sequence
 *	    option flags
 * Sniffs at file to get flags
 */

void tenex_flags (MAILSTREAM *stream,char *sequence,long flags)
{
  unsigned long i;
  if (stream && LOCAL &&
      ((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) tenex_elt (stream,i);
}

/* TENEX 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 *tenex_header (MAILSTREAM *stream,unsigned long msgno,
		    unsigned long *length,long flags)
{
  char *s;
  unsigned long i;
  *length = 0;			/* default to empty */
  if (flags & FT_UID) return "";/* UID call "impossible" */
				/* get to header position */
  lseek (LOCAL->fd,tenex_hdrpos (stream,msgno,&i),L_SET);
  if (flags & FT_INTERNAL) {
    if (i > LOCAL->buflen) {	/* resize if not enough space */
      fs_give ((void **) &LOCAL->buf);
      LOCAL->buf = (char *) fs_get (LOCAL->buflen = i + 1);
    }
				/* slurp the data */
    read (LOCAL->fd,LOCAL->buf,*length = i);
  }
  else {
    s = (char *) fs_get (i + 1);/* get readin buffer */
    s[i] = '\0';		/* tie off string */
    read (LOCAL->fd,s,i);	/* slurp the data */
				/* make CRLF copy of string */
    *length = strcrlfcpy (&LOCAL->buf,&LOCAL->buflen,s,i);
    fs_give ((void **) &s);	/* free readin buffer */
  }
  return LOCAL->buf;
}

/* TENEX mail fetch message text (body only)
 * Accepts: MAIL stream
 *	    message # to fetch
 *	    pointer to returned stringstruct
 *	    option flags
 * Returns: T, always
 */

long tenex_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
{
  char *s;
  unsigned long i,j;
  MESSAGECACHE *elt;
				/* UID call "impossible" */
  if (flags & FT_UID) return NIL;
				/* get message status */
  elt = tenex_elt (stream,msgno);
				/* if message not seen */
  if (!(flags & FT_PEEK) && !elt->seen) {
    elt->seen = T;		/* mark message as seen */
				/* recalculate status */
    tenex_update_status (stream,msgno,T);
    mm_flags (stream,msgno);
  }
				/* find header position */
  i = tenex_hdrpos (stream,msgno,&j);
  lseek (LOCAL->fd,i + j,L_SET);
				/* go to text position */
  if (flags & FT_INTERNAL) {	/* if internal representation wanted */
    if (i > LOCAL->buflen) {	/* resize if not enough space */
      fs_give ((void **) &LOCAL->buf);
      LOCAL->buf = (char *) fs_get (LOCAL->buflen = i + 1);
    }
				/* slurp the data */
    read (LOCAL->fd,LOCAL->buf,i);
  }
  else {			/* get readin buffer */
    s = (char *) fs_get ((i = tenex_size (stream,msgno) - j) + 1);
    s[i] = '\0';		/* tie off string */
    read (LOCAL->fd,s,i);	/* slurp the data */
				/* make CRLF copy of string */
    i = strcrlfcpy (&LOCAL->buf,&LOCAL->buflen,s,i);
    fs_give ((void **) &s);	/* free readin buffer */
  }
				/* set up stringstruct */
  INIT (bs,mail_string,LOCAL->buf,i);
  return T;			/* success */
}

/* Tenex mail modify flags
 * Accepts: MAIL stream
 *	    sequence
 *	    flag(s)
 *	    option flags
 */

void tenex_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;
  }
}


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

void tenex_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 */
  tenex_update_status (stream,elt->msgno,NIL);
}

/* Tenex mail ping mailbox
 * Accepts: MAIL stream
 * Returns: T if stream still alive, NIL if not
 */

long tenex_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) tenex_elt (stream,i++);
      LOCAL->mustcheck = LOCAL->shouldcheck = NIL;
    }
				/* get shared parse/append permission */
    if ((sbuf.st_size != LOCAL->filesize) &&
	((ld = lockfd (LOCAL->fd,lock,LOCK_SH)) >= 0)) {
				/* parse resulting mailbox */
      r = (tenex_parse (stream)) ? T : NIL;
      unlockfd (ld,lock);	/* release shared parse/append permission */
    }
    if (LOCAL) {		/* stream must still be alive */
				/* snarf if this is a read-write inbox */
      if (stream->inbox && !stream->rdonly) {
	tenex_snarf (stream);
	fstat (LOCAL->fd,&sbuf);/* see if file changed now */
	if ((sbuf.st_size != LOCAL->filesize) &&
	    ((ld = lockfd (LOCAL->fd,lock,LOCK_SH)) >= 0)) {
				/* parse resulting mailbox */
	  r = (tenex_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)) {
	time_t tp[2];		/* whack the times if necessary */
	LOCAL->filetime = tp[0] = tp[1] = time (0);
	utime (stream->mailbox,tp);
      }
    }
  }
  return r;			/* return result of the parse */
}


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

void tenex_check (MAILSTREAM *stream)
{
				/* mark that a check is desired */
  if (LOCAL) LOCAL->mustcheck = T;
  if (tenex_ping (stream)) mm_log ("Check completed",(long) NIL);
}

/* Tenex mail snarf messages from system inbox
 * Accepts: MAIL stream
 */

void tenex_snarf (MAILSTREAM *stream)
{
  unsigned long i = 0;
  unsigned long j,r,hdrlen,txtlen;
  struct stat sbuf;
  char *hdr,*txt,lock[MAILTMPLEN],tmp[MAILTMPLEN];
  MESSAGECACHE *elt;
  MAILSTREAM *sysibx = NIL;
  int ld;
				/* give up if can't get exclusive permission */
  if ((time (0) < (LOCAL->lastsnarf + 30)) ||
      (!strcmp (sysinbox (),stream->mailbox)) ||
      ((ld = lockfd (LOCAL->fd,lock,LOCK_EX)) < 0)) return;
  mm_critical (stream);		/* go critical */
				/* see if anything there */
  if (!stat (sysinbox (),&sbuf) && sbuf.st_size) {
    fstat (LOCAL->fd,&sbuf);	/* yes, get current file size */
				/* sizes match and can get sysibx mailbox? */
    if ((sbuf.st_size == LOCAL->filesize) && 
	(sysibx = mail_open (sysibx,sysinbox (),OP_SILENT)) &&
	(!sysibx->rdonly) && (r = sysibx->nmsgs)) {
				/* yes, go to end of file in our mailbox */
      lseek (LOCAL->fd,sbuf.st_size,L_SET);
				/* for each message in sysibx mailbox */
      while (r && (++i <= sysibx->nmsgs)) {
				/* snarf message from system INBOX */
	hdr = cpystr (mail_fetchheader_full(sysibx,i,NIL,&hdrlen,FT_INTERNAL));
	txt = mail_fetchtext_full (sysibx,i,&txtlen,FT_INTERNAL|FT_PEEK);
	if (j = hdrlen + txtlen) {
				/* calculate header line */
	  mail_date (LOCAL->buf,elt = mail_elt (sysibx,i));
	  sprintf (LOCAL->buf + strlen (LOCAL->buf),
		   ",%lu;0000000000%02o\n",j,(unsigned)
		   ((fSEEN * elt->seen) + (fDELETED * elt->deleted) +
		    (fFLAGGED * elt->flagged) + (fANSWERED * elt->answered) +
		    (fDRAFT * elt->draft)));
				/* copy message */
	  if ((write (LOCAL->fd,LOCAL->buf,strlen (LOCAL->buf)) < 0) ||
	      (write (LOCAL->fd,hdr,hdrlen) < 0) ||
	      (write (LOCAL->fd,txt,txtlen) < 0)) r = 0;
	}
	fs_give ((void **) &hdr);
      }
				/* make sure all the updates take */
      if (fsync (LOCAL->fd)) r = 0;
      if (r) {			/* delete all the messages we copied */
	if (r == 1) strcpy (tmp,"1");
	else sprintf (tmp,"1:%lu",r);
	mail_flag (sysibx,tmp,"\\Deleted",ST_SET);
	mail_expunge (sysibx);	/* now expunge all those messages */
      }
      else {
	sprintf (LOCAL->buf,"Can't copy new mail: %s",strerror (errno));
	mm_log (LOCAL->buf,ERROR);
	ftruncate (LOCAL->fd,sbuf.st_size);
      }
      fstat (LOCAL->fd,&sbuf);	/* yes, get current file size */
      LOCAL->filetime = sbuf.st_mtime;
    }
    if (sysibx) mail_close (sysibx);
  }
  mm_nocritical (stream);	/* release critical */
  unlockfd (ld,lock);		/* release exclusive parse/append permission */
  LOCAL->lastsnarf = time (0);	/* note time of last snarf */
}

/* Tenex mail expunge mailbox
 * Accepts: MAIL stream
 */

void tenex_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;
  blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
				/* do nothing if stream dead */
  if (!tenex_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;
  }
  /* The cretins who designed flock() created a window of vulnerability in
   * upgrading locks from shared to exclusive or downgrading from exclusive
   * to shared.  Rather than maintain the lock at shared status at a minimum,
   * flock() actually *releases* the former lock.  Obviously they never talked
   * to any database guys.  Fortunately, we have the parse/append permission
   * lock.  If we require this lock before going exclusive on the mailbox,
   * another process can not sneak in and steal the exclusive mailbox lock on
   * us, because it will block on trying to get parse/append permission first.
   */
				/* get exclusive parse/append permission */
  if ((ld = lockfd (LOCAL->fd,lock,LOCK_EX)) < 0) {
    mm_log ("Unable to lock expunge mailbox",ERROR);
    return;
  }
				/* get exclusive access */
  if (flock (LOCAL->fd,LOCK_EX|LOCK_NB)) {
    (*bn) (BLOCK_FILELOCK,NIL);
    flock (LOCAL->fd,LOCK_SH);	/* recover previous lock */
    (*bn) (BLOCK_NONE,NIL);
    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 = tenex_elt (stream,i);	/* get cache element */
				/* number of bytes to smash or preserve */
    k = elt->private.special.text.size + tenex_size (stream,i);
    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 */
	lseek (LOCAL->fd,pos,L_SET);
	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);
  (*bn) (BLOCK_FILELOCK,NIL);
  flock (LOCAL->fd,LOCK_SH);	/* allow sharers again */
  (*bn) (BLOCK_NONE,NIL);
  unlockfd (ld,lock);		/* release exclusive parse/append permission */
}

/* Tenex mail copy message(s)
 * Accepts: MAIL stream
 *	    sequence
 *	    destination mailbox
 *	    copy options
 * Returns: T if success, NIL if failed
 */

long tenex_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
{
  struct stat sbuf;
  time_t tp[2];
  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 (!tenex_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 Tenex-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 Tenex-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(tenex_file(file,mailbox),O_RDWR|O_CREAT,S_IREAD|S_IWRITE))<0) {
    sprintf (LOCAL->buf,"Unable to open copy mailbox: %s",strerror (errno));
    mm_log (LOCAL->buf,ERROR);
    return NIL;
  }
  mm_critical (stream);		/* go critical */
				/* get exclusive parse/append permission */
  if ((ld = lockfd (fd,lock,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 */