tcp_mac.c

广泛使用的邮件服务器！同时

      stc->text.size = n;
      stc = stc->next = mail_newstringlist ();
      ret = tcp_getline_work (stream,&n,&contd);
    } while (ret && contd);
    if (ret) {			/* stash final part of line on list */
      stc->text.data = (unsigned char *) ret;
      stc->text.size = n;
				/* determine how large a buffer we need */
      for (n = 0, stc = stl; stc; stc = stc->next) n += stc->text.size;
      ret = fs_get (n + 1);	/* copy parts into buffer */
      for (n = 0, stc = stl; stc; n += stc->text.size, stc = stc->next)
	memcpy (ret + n,stc->text.data,stc->text.size);
      ret[n] = '\0';
    }
    mail_free_stringlist (&stl);/* either way, done with list */
  }
  return ret;
}

/* TCP receive line or partial line
 * Accepts: TCP stream
 *	    pointer to return size
 *	    pointer to return continuation flag
 * Returns: text line string, size and continuation flag, or NIL if failure
 */

static char *tcp_getline_work (TCPSTREAM *stream,unsigned long *size,
			       long *contd)
{
  unsigned long n;
  char *s,*ret,c,d;
  *contd = NIL;			/* assume no continuation */
				/* make sure have data */
  if (!tcp_getdata (stream)) return NIL;
  for (s = stream->iptr, n = 0, c = '\0'; stream->ictr--; n++, c = d) {
    d = *stream->iptr++;	/* slurp another character */
    if ((c == '\015') && (d == '\012')) {
      ret = (char *) fs_get (n--);
      memcpy (ret,s,*size = n);	/* copy into a free storage string */
      ret[n] = '\0';		/* tie off string with null */
      return ret;
    }
  }
				/* copy partial string from buffer */
  memcpy ((ret = (char *) fs_get (n)),s,*size = n);
				/* get more data from the net */
  if (!tcp_getdata (stream)) fs_give ((void **) &ret);
				/* special case of newline broken by buffer */
  else if ((c == '\015') && (*stream->iptr == '\012')) {
    stream->iptr++;		/* eat the line feed */
    stream->ictr--;
    ret[*size = --n] = '\0';	/* tie off string with null */
  }
  else *contd = LONGT;		/* continuation needed */
  return ret;
}

/* TCP/IP receive buffer
 * Accepts: TCP/IP stream
 *	    size in bytes
 *	    buffer to read into
 * Returns: T if success, NIL otherwise
 */

long tcp_getbuffer (TCPSTREAM *stream,unsigned long size,char *buffer)
{
  unsigned long n;
  char *bufptr = buffer;
  while (size > 0) {		/* until request satisfied */
    if (!tcp_getdata (stream)) return NIL;
    n = min (size,stream->ictr);/* number of bytes to transfer */
				/* do the copy */
    memcpy (bufptr,stream->iptr,n);
    bufptr += n;		/* update pointer */
    stream->iptr +=n;
    size -= n;			/* update # of bytes to do */
    stream->ictr -=n;
  }
  bufptr[0] = '\0';		/* tie off string */
  return T;
}


/* TCP/IP receive data
 * Accepts: TCP/IP stream
 * Returns: T if success, NIL otherwise
 */

long tcp_getdata (TCPSTREAM *stream)
{
  time_t t = time (0);
  struct TCPReceivePB *receivepb = &stream->pb.csParam.receive;
  struct TCPAbortPB *abortpb = &stream->pb.csParam.abort;
  while (stream->ictr < 1) {	/* if nothing in the buffer */
    time_t tl = time (0);
    stream->pb.csCode = TCPRcv;	/* receive TCP data */
    receivepb->commandTimeoutValue = (int) ttmo_read;
    receivepb->rcvBuff = stream->ibuf;
    receivepb->rcvBuffLen = BUFLEN;
    receivepb->secondTimeStamp = 0;
    receivepb->userDataPtr = NIL;
    PBControlAsync ((ParmBlkPtr) &stream->pb);
    while (stream->pb.ioResult == inProgress && wait ());
    if (stream->pb.ioResult) {	/* punt if got an error */
      time_t tc = time (0);
      if ((stream->pb.ioResult == commandTimeout) && tmoh &&
	  ((*tmoh) (tc - t,tc - tl))) continue;
    				/* nuke connection */
      stream->pb.csCode = TCPAbort;
      abortpb->userDataPtr = NIL;
      PBControlSync ((ParmBlkPtr) &stream->pb);
      return NIL;
    }
    stream->iptr = stream->ibuf;/* point at TCP buffer */
    stream->ictr = receivepb->rcvBuffLen;
  }
  return T;
}

/* TCP/IP send string as record
 * Accepts: TCP/IP stream
 *	    string pointer
 * Returns: T if success else NIL
 */

long tcp_soutr (TCPSTREAM *stream,char *string)
{
  return tcp_sout (stream,string,(unsigned long) strlen (string));
}


/* TCP/IP send string
 * Accepts: TCP/IP stream
 *	    string pointer
 *	    byte count
 * Returns: T if success else NIL
 */

long tcp_sout (TCPSTREAM *stream,char *string,unsigned long size)
{
  struct TCPSendPB *sendpb = &stream->pb.csParam.send;
  struct TCPAbortPB *abortpb = &stream->pb.csParam.abort;
  struct {
    unsigned short length;
    Ptr buffer;
    unsigned short trailer;
  } wds;
  while (wds.length = (size > (unsigned long) 32768) ? 32768 : size) {
    wds.buffer = string;	/* buffer */
    wds.trailer = 0;		/* tie off buffer */
    size -= wds.length;		/* this many words will be output */
    string += wds.length;
    stream->pb.csCode = TCPSend;/* send TCP data */
    sendpb->ulpTimeoutValue = (int) ttmo_write;
    sendpb->ulpTimeoutAction = 0;
    sendpb->validityFlags = timeoutValue|timeoutAction;
    sendpb->pushFlag = T;	/* send the data now */
    sendpb->urgentFlag = NIL;	/* non-urgent data */
    sendpb->wdsPtr = (Ptr) &wds;
    sendpb->userDataPtr = NIL;
    PBControlAsync ((ParmBlkPtr) &stream->pb);
    while (stream->pb.ioResult == inProgress && wait ());
    if (stream->pb.ioResult) {	/* punt if got an error */
				/* nuke connection */
      stream->pb.csCode =TCPAbort;
      abortpb->userDataPtr = NIL;
      PBControlSync ((ParmBlkPtr) &stream->pb);
      return NIL;
    }
  }
  return T;			/* success */
}

/* TCP/IP close
 * Accepts: TCP/IP stream
 */

void tcp_close (TCPSTREAM *stream)
{
  struct TCPClosePB *closepb = &stream->pb.csParam.close;
  struct TCPCreatePB *createpb = &stream->pb.csParam.create;
  stream->pb.csCode = TCPClose;	/* close TCP stream */
  closepb->ulpTimeoutValue = (int) ttmo_close;
  closepb->ulpTimeoutAction = 0;
  closepb->validityFlags = timeoutValue|timeoutAction;
  closepb->userDataPtr = NIL;
  PBControlAsync ((ParmBlkPtr) &stream->pb);
  while (stream->pb.ioResult == inProgress && wait ());
  stream->pb.csCode =TCPRelease;/* flush the buffers */
  createpb->userDataPtr = NIL;
  if (PBControlSync ((ParmBlkPtr) &stream->pb)) fatal ("TCPRelease lossage");
				/* free its buffer */
  fs_give ((void **) &createpb->rcvBuff);
				/* flush host names */
  fs_give ((void **) &stream->host);
  fs_give ((void **) &stream->localhost);
  fs_give ((void **) &stream);	/* flush the stream */
}

/* TCP/IP return host for this stream
 * Accepts: TCP/IP stream
 * Returns: host name for this stream
 */

char *tcp_host (TCPSTREAM *stream)
{
  return stream->host;		/* return host name */
}


/* TCP/IP return remote host for this stream
 * Accepts: TCP/IP stream
 * Returns: host name for this stream
 */

char *tcp_remotehost (TCPSTREAM *stream)
{
  return stream->host;		/* return host name */
}


/* TCP/IP return port for this stream
 * Accepts: TCP/IP stream
 * Returns: port number for this stream
 */

unsigned long tcp_port (TCPSTREAM *stream)
{
  return stream->port;		/* return port number */
}


/* TCP/IP return local host for this stream
 * Accepts: TCP/IP stream
 * Returns: local host name for this stream
 */

char *tcp_localhost (TCPSTREAM *stream)
{
  return stream->localhost;	/* return local host name */
}

/* TCP/IP return canonical form of host name
 * Accepts: host name
 * Returns: canonical form of host name
 */

char *tcp_canonical (char *name)
{
  int i;
  struct hostInfo hst;
				/* look like domain literal? */
  if (name[0] == '[' && name[i = (strlen (name))-1] == ']') return name;
  if (StrToAddr (name,&hst,tcp_dns_upp,NIL)) {
    while (hst.rtnCode == cacheFault && wait ());
				/* kludge around MacTCP bug */
    if (hst.rtnCode == outOfMemory) {
      mm_log ("Re-initializing domain resolver",WARN);
      CloseResolver ();		/* bop it on the head and try again */
      OpenResolver (NIL);	/* note this will leak 12K */
      StrToAddr (name,&hst,tcp_dns_upp,NIL);
      while (hst.rtnCode == cacheFault && wait ());
    }
				/* still have error status? */
    if (hst.rtnCode) return name;
  }
  return hst.cname;		/* success */
}


/* TCP/IP get client host name (server calls only)
 * Returns: client host name
 */

char *tcp_clienthost ()
{
  return "UNKNOWN";
}