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TCPLib.c
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1994-10-03
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202 lines
/*
* File: TCPLib.c
*
* Parts of this code are (c) Copyright 1988 by Apple Computer. All rights reserved
*/
#include "TCPLib.h"
#define OPENRESOLVER 1L
#define CLOSERESOLVER 2L
#define STRTOADDR 3L
#define ADDRTOSTR 4L
#define ENUMCACHE 5L
#define ADDRTONAME 6L
short refNum;
OSErrProcPtr dnr = 0L;
Handle codeHndl = 0L;
/* OpenOurRF is called to open the MacTCP driver resources */
short OpenOurRF(void)
{
SysEnvRec info;
HParamBlockRec fi;
Str255 filename;
SysEnvirons(1, &info);
fi.fileParam.ioCompletion = 0L;
fi.fileParam.ioNamePtr = filename;
fi.fileParam.ioVRefNum = info.sysVRefNum;
fi.fileParam.ioDirID = 0;
fi.fileParam.ioFDirIndex = 1;
while (PBHGetFInfo(&fi, false) == noErr) {
/* scan system folder for driver resource files of specific type & creator */
if (fi.fileParam.ioFlFndrInfo.fdType == 'cdev' &&
fi.fileParam.ioFlFndrInfo.fdCreator == 'mtcp') {
/* found the MacTCP driver file */
SetVol(0,info.sysVRefNum);
return(OpenResFile(filename));
}
/* check next file in system folder */
fi.fileParam.ioFDirIndex++;
fi.fileParam.ioDirID = 0;
}
return(-1);
}
OSErr OpenResolver(fileName)
char *fileName;
{
short refnum;
OSErr rc;
if (dnr != 0L)
/* resolver already loaded in */
return(noErr);
/* open the MacTCP driver to get DNR resources. Search for it based on
creator & type rather than simply file name */
refnum = OpenOurRF();
/* ignore failures since the resource may have been installed in the
System file if running on a Mac 512Ke */
/* load in the DNR resource package */
codeHndl = GetIndResource('dnrp', 1);
if (codeHndl == 0L) {
/* can't open DNR */
return(ResError());
}
DetachResource(codeHndl);
if (refnum != -1) {
CloseResFile(refnum);
}
/* lock the DNR resource since it cannot be reloated while opened */
HLock(codeHndl);
dnr = (OSErrProcPtr) *codeHndl;
/* call open resolver */
rc = (*dnr)(OPENRESOLVER, fileName);
if (rc != noErr) {
/* problem with open resolver, flush it */
HUnlock(codeHndl);
DisposHandle(codeHndl);
dnr = 0L;
}
return(rc);
}
OSErr CloseResolver(void)
{
if (dnr == 0L)
/* resolver not loaded error */
return(notOpenErr);
/* call close resolver */
(void) (*dnr)(CLOSERESOLVER);
/* release the DNR resource package */
HUnlock(codeHndl);
DisposHandle(codeHndl);
dnr = 0L;
return(noErr);
}
OSErr AddrToStr(addr, addrStr)
unsigned long addr;
char *addrStr;
{
if (dnr == 0L)
/* resolver not loaded error */
return(notOpenErr);
(*dnr)(ADDRTOSTR, addr, addrStr);
return(noErr);
}
OSErr OpenTCPDriver()
{
OSErr err;
err = OpenDriver("\p.IPP",&refNum);
return(err);
}
OSErr InitNetwork(void)
{
return OpenTCPDriver();
}
static pascal void DNRResultProc (struct hostInfo *hInfoPtr, char *userDataPtr)
{
*(Boolean*)userDataPtr = true;
}
long GiveTime(long x)
{
unsigned long finalTicks;
extern void HandleEvents();
finalTicks = TickCount() + x;
do {
HandleEvents();
} while (TickCount() < finalTicks);
return(finalTicks);
}
OSErr AddrToName(addr, rtnStruct, resultproc, userDataPtr)
unsigned long addr;
struct hostInfo *rtnStruct;
ResultProcPtr resultproc;
char *userDataPtr;
{
if (dnr == 0L)
/* resolver not loaded error */
return(notOpenErr);
return((*dnr)(ADDRTONAME, addr, rtnStruct, resultproc, userDataPtr));
}
/* LowIPAddrToName invokes the domain name system to translate an IP address
into a domain name. */
OSErr LowIPAddrToName (unsigned long addr, char *name)
{
struct hostInfo hInfo;
OSErr err;
Boolean done=false;
if ((err = OpenResolver(nil)) != noErr) return err;
err = AddrToName(addr, &hInfo, DNRResultProc, (char*)&done);
if (err == cacheFault) {
while (!done) GiveTime(1L);
err = hInfo.rtnCode;
}
CloseResolver();
hInfo.cname[254] = 0;
strcpy(name,hInfo.cname);
return err;
}
/* IPAddrToName invokes the domain name system to translate an IP address
into a domain name. */
OSErr IPAddrToName (unsigned long addr, char *name)
{
return LowIPAddrToName(addr, name);
}