tcp_mac.c

这是用C编写IMAP源代码

/*
 * Program:	Macintosh TCP/IP routines
 *
 * Author:	Mark Crispin
 *		Networks and Distributed Computing
 *		Computing & Communications
 *		University of Washington
 *		Administration Building, AG-44
 *		Seattle, WA  98195
 *		Internet: [e-mail]
 *
 * Date:	26 January 1992
 * Last Edited:	24 October 2000
 * 
 * The IMAP toolkit provided in this Distribution is
 * Copyright 2000 University of Washington.
 * The full text of our legal notices is contained in the file called
 * CPYRIGHT, included with this Distribution.
 */


/*  This is a totally new operating-system dependent module for the Macintosh,
 * written using THINK C on my Mac PowerBook-100 in my free time.
 * Unlike earlier efforts, this version requires no external TCP library.  It
 * also takes advantage of the Map panel in System 7 for the timezone.
 */

static tcptimeout_t tmoh = NIL;	/* TCP timeout handler routine */
static long ttmo_open = 75;	/* TCP timeouts, in seconds */
static long ttmo_read = 0;
static long ttmo_write = 0;
static long ttmo_close = 0;

/* TCP/IP manipulate parameters
 * Accepts: function code
 *	    function-dependent value
 * Returns: function-dependent return value
 */

void *tcp_parameters (long function,void *value)
{
  void *ret = NIL;
  switch ((int) function) {
  case SET_TIMEOUT:
    tmoh = (tcptimeout_t) value;
  case GET_TIMEOUT:
    ret = (void *) tmoh;
    break;
  case SET_OPENTIMEOUT:
    ttmo_open = (long) value;
  case GET_OPENTIMEOUT:
    ret = (void *) ttmo_open;
    break;
  case SET_READTIMEOUT:
    ttmo_read = (long) value;
  case GET_READTIMEOUT:
    ret = (void *) ttmo_read;
    break;
  case SET_WRITETIMEOUT:
    ttmo_write = (long) value;
  case GET_WRITETIMEOUT:
    ret = (void *) ttmo_write;
    break;
  case SET_CLOSETIMEOUT:
    ttmo_close = (long) value;
  case GET_CLOSETIMEOUT:
    ret = (void *) ttmo_close;
    break;
  }
  return ret;
}

/* TCP/IP open
 * Accepts: host name
 *	    contact service name
 *	    contact port number
 * Returns: TCP stream if success else NIL
 */

TCPSTREAM *tcp_open (char *host,char *service,unsigned long port)
{
  TCPSTREAM *stream;
  struct hostInfo hst;
  struct TCPCreatePB *createpb;
  struct TCPOpenPB *openpb;
  char *s;
  unsigned long i,j,k,l;
  char tmp[MAILTMPLEN];
  port &= 0xffff;		/* erase flags */
				/* init MacTCP */
  if (!TCPdriver && OpenDriver (TCPDRIVER,&TCPdriver)) {
    mm_log ("Can't init MacTCP",ERROR);
    return NIL;
  }
  if (!resolveropen && OpenResolver (NIL)) {
    mm_log ("Can't init domain resolver",ERROR);
    return NIL;
  }
  resolveropen = T;		/* note resolver open now */
				/* domain literal? */
  if (host[0] == '[' && host[strlen (host)-1] == ']') {
    if (((i = strtoul (s = host+1,&s,10)) <= 255) && *s++ == '.' &&
	((j = strtoul (s,&s,10)) <= 255) && *s++ == '.' &&
	((k = strtoul (s,&s,10)) <= 255) && *s++ == '.' &&
	((l = strtoul (s,&s,10)) <= 255) && *s++ == ']' && !*s) {
      hst.addr[0] = (i << 24) + (j << 16) + (k << 8) + l;
      hst.addr[1] = 0;		/* only one address to try! */
      sprintf (hst.cname,"[%ld.%ld.%ld.%ld]",i,j,k,l);
    }
    else {
      sprintf (tmp,"Bad format domain-literal: %.80s",host);
      mm_log (tmp,ERROR);
      return NIL;
    }
  }

  else {			/* look up host name */
    if (!tcp_dns_upp) tcp_dns_upp = NewResultProc (tcp_dns_result);
    if (StrToAddr (host,&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 (host,&hst,tcp_dns_upp,NIL);
	while (hst.rtnCode == cacheFault && wait ());
      }
      if (hst.rtnCode) {	/* still have error status? */
	switch (hst.rtnCode) {	/* analyze return */
	case nameSyntaxErr:
	  s = "Syntax error in name";
	  break;
	case noResultProc:
	  s = "No result procedure";
	  break;
	case noNameServer:
	  s = "No name server found";
	  break;
	case authNameErr:
	  s = "Host does not exist";
	  break;
	case noAnsErr:
	  s = "No name servers responding";
	  break;
	case dnrErr:
	  s = "Name server returned an error";
	  break;
	case outOfMemory:
	  s = "Not enough memory to resolve name";
	  break;
	case notOpenErr:
	  s = "Driver not open";
	  break;
	default:
	  s = NIL;
	  break;
	}
	if (s) sprintf (tmp,"%s: %.80s",s,host);
	else sprintf (tmp,"Unknown resolver error (%ld): %.80s",
		      hst.rtnCode,host);
	mm_log (tmp,ERROR);
	return NIL;
      }
    }
  }

				/* create local TCP/IP stream */
  stream = (TCPSTREAM *) fs_get (sizeof (TCPSTREAM));
  stream->ictr = 0;		/* initialize input */
  stream->pb.ioCRefNum = TCPdriver;
  createpb = &stream->pb.csParam.create;
  openpb = &stream->pb.csParam.open;
  stream->pb.csCode = TCPCreate;/* create a TCP stream */
				/* set up buffer for TCP */
  createpb->rcvBuffLen = 4*BUFLEN;
  createpb->rcvBuff = fs_get (createpb->rcvBuffLen);
  createpb->notifyProc = NIL;	/* no special notify procedure */
  createpb->userDataPtr = NIL;
  if (PBControlSync ((ParmBlkPtr) &stream->pb))
    fatal ("Can't create TCP stream");
  				/* open TCP connection */
  stream->pb.csCode = TCPActiveOpen;
  openpb->ulpTimeoutValue = (int) ttmo_open;
  openpb->ulpTimeoutAction = T;
  openpb->validityFlags = timeoutValue|timeoutAction;
				/* remote host (should try all) */
  openpb->remoteHost = hst.addr[0];
  openpb->remotePort = port;	/* caller specified remote port */
  openpb->localPort = 0;	/* generate a local port */
  openpb->tosFlags = 0;		/* no special TOS */
  openpb->precedence = 0;	/* no special precedence */
  openpb->dontFrag = 0;		/* allow fragmentation */
  openpb->timeToLive = 255;	/* standards say 60, UNIX uses 255 */
  openpb->security = 0;		/* no special security */
  openpb->optionCnt = 0;	/* no IP options */
  openpb->options[0] = 0;
  openpb->userDataPtr = NIL;	/* no special data pointer */
  PBControlAsync ((ParmBlkPtr) &stream->pb);
  while (stream->pb.ioResult == inProgress && wait ());
  if (stream->pb.ioResult) {	/* got back error status? */
    sprintf (tmp,"Can't connect to %.80s,%ld",hst.cname,port);
    mm_log (tmp,ERROR);
				/* nuke the buffer */
    stream->pb.csCode = TCPRelease;
    createpb->userDataPtr = NIL;
    if (PBControlSync ((ParmBlkPtr) &stream->pb)) fatal ("TCPRelease lossage");
				/* free its buffer */
    fs_give ((void **) &createpb->rcvBuff);
    fs_give ((void **) &stream);/* and the local stream */
    return NIL;
  }

				/* copy host names for later use */
  stream->host = cpystr (hst.cname);
				/* tie off trailing dot */
  stream->host[strlen (stream->host) - 1] = '\0';
				/* the open gave us our address */
  i = (openpb->localHost >> 24) & 0xff;
  j = (openpb->localHost >> 16) & 0xff;
  k = (openpb->localHost >> 8) & 0xff;
  l = openpb->localHost & 0xff;
  sprintf (tmp,"[%ld.%ld.%ld.%ld]",i,j,k,l);
  stream->localhost = cpystr (tmp);
  if (!myLocalHost) myLocalHost = cpystr (tmp);
  stream->port = port;		/* copy port number */
  return stream;
}


/* Called when have return from DNS
 * Accepts: host info pointer
 *	    user data pointer
 */

ResultUPP tcp_dns_upp = NIL;

pascal void tcp_dns_result (struct hostInfo *hostInfoPtr,char *userDataPtr)
{
  /* dummy routine */
}

/* TCP/IP authenticated open
 * Accepts: NETMBX specifier
 *	    service name
 *	    returned user name buffer
 * Returns: TCP/IP stream if success else NIL
 */

TCPSTREAM *tcp_aopen (NETMBX *mb,char *service,char *usrbuf)
{
  return NIL;			/* no authenticated opens on Mac */
}

/* TCP/IP receive line
 * Accepts: TCP/IP stream
 * Returns: text line string or NIL if failure
 */

char *tcp_getline (TCPSTREAM *stream)
{
  int n,m;