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/* |
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* DNR.c - DNR library for MPW |
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* |
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* (c) Copyright 1988 by Apple Computer. All rights reserved |
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* |
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* Modifications by Jim Matthews, Dartmouth College, 5/91 |
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*/ |
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|
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#include <OSUtils.h> |
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#include <Files.h> |
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#include <Folders.h> |
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#include <GestaltEqu.h> |
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#include <Traps.h> |
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|
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#include "AddressXlation.h" |
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#include "tcp.h" |
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|
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#define OPENRESOLVER 1 |
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#define CLOSERESOLVER 2 |
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#define STRTOADDR 3 |
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#define ADDRTOSTR 4 |
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#define ENUMCACHE 5 |
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#define ADDRTONAME 6 |
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#define HINFO 7 |
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#define MXINFO 8 |
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|
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TrapType GetTrapType(unsigned long theTrap); |
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Boolean TrapAvailable(unsigned long trap); |
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void GetSystemFolder(short *vRefNumP, long *dirIDP); |
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void GetCPanelFolder(short *vRefNumP, long *dirIDP); |
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short SearchFolderForDNRP(long targetType, long targetCreator, |
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short vRefNum, long dirID); |
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short OpenOurRF(void); |
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|
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Handle dnr = nil; |
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|
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TrapType |
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GetTrapType(unsigned long theTrap) |
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{ |
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if (BitAnd(theTrap, 0x0800) > 0) |
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return (ToolTrap); |
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|
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return (OSTrap); |
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} |
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|
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Boolean |
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TrapAvailable(unsigned long trap) |
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{ |
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TrapType trapType = ToolTrap; |
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unsigned long numToolBoxTraps; |
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|
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if (NGetTrapAddress(_InitGraf, ToolTrap) == |
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NGetTrapAddress(0xAA6E, ToolTrap)) |
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numToolBoxTraps = 0x200; |
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else |
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numToolBoxTraps = 0x400; |
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|
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trapType = GetTrapType(trap); |
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if (trapType == ToolTrap) { |
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trap = BitAnd(trap, 0x07FF); |
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if (trap >= numToolBoxTraps) |
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trap = _Unimplemented; |
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} |
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|
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return (NGetTrapAddress(trap, trapType) != |
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NGetTrapAddress(_Unimplemented, ToolTrap)); |
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} |
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|
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void |
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GetSystemFolder(short *vRefNumP, long *dirIDP) |
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{ |
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SysEnvRec info; |
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long wdProcID; |
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|
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SysEnvirons(1, &info); |
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if (GetWDInfo(info.sysVRefNum, vRefNumP, dirIDP, &wdProcID) != noErr) { |
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*vRefNumP = 0; |
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*dirIDP = 0; |
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} |
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} |
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|
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void |
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GetCPanelFolder(short *vRefNumP, long *dirIDP) |
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{ |
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Boolean hasFolderMgr = false; |
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long feature; |
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|
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if (TrapAvailable(_GestaltDispatch) && |
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Gestalt(gestaltFindFolderAttr, &feature) == noErr) |
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hasFolderMgr = true; |
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|
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if (!hasFolderMgr) { |
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GetSystemFolder(vRefNumP, dirIDP); |
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return; |
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} |
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|
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if (FindFolder(kOnSystemDisk, kControlPanelFolderType, |
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kDontCreateFolder, vRefNumP, dirIDP) != noErr) { |
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*vRefNumP = 0; |
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*dirIDP = 0; |
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} |
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} |
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|
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/* |
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* SearchFolderForDNRP is called to search a folder for files that might |
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* contain the 'dnrp' resource |
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*/ |
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short |
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SearchFolderForDNRP(long targetType, long targetCreator, short vRefNum, |
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long dirID) |
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{ |
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HParamBlockRec fi; |
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Str255 filename; |
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short refnum; |
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|
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fi.fileParam.ioCompletion = nil; |
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fi.fileParam.ioNamePtr = (StringPtr)&filename; |
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fi.fileParam.ioVRefNum = vRefNum; |
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fi.fileParam.ioDirID = dirID; |
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fi.fileParam.ioFDirIndex = 1; |
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|
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while (PBHGetFInfo(&fi, false) == noErr) { |
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/* scan system folder for driver resource files of specific type & creator */ |
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if (fi.fileParam.ioFlFndrInfo.fdType == targetType && |
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fi.fileParam.ioFlFndrInfo.fdCreator == targetCreator) { |
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/* found the MacTCP driver file? */ |
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refnum = HOpenResFile(vRefNum, dirID, filename, fsRdPerm); |
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if (Get1IndResource('dnrp', 1)) |
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return refnum; |
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CloseResFile(refnum); |
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} |
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|
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/* check next file in system folder */ |
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fi.fileParam.ioFDirIndex++; |
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fi.fileParam.ioDirID = dirID; /* PBHGetFInfo() clobbers ioDirID */ |
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} |
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return -1; |
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} |
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|
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/* OpenOurRF is called to open the MacTCP driver resources */ |
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short |
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OpenOurRF(void) |
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{ |
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short refnum; |
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short vRefNum; |
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long dirID; |
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|
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/* first search Control Panels for MacTCP 1.1 */ |
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GetCPanelFolder(&vRefNum, &dirID); |
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refnum = SearchFolderForDNRP('cdev', 'ztcp', vRefNum, dirID); |
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if (refnum != -1) |
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return (refnum); |
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|
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/* next search System Folder for MacTCP 1.0.x */ |
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GetSystemFolder(&vRefNum, &dirID); |
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refnum = SearchFolderForDNRP('cdev', 'mtcp', vRefNum, dirID); |
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if (refnum != -1) |
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return (refnum); |
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|
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/* finally, search Control Panels for MacTCP 1.0.x */ |
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GetCPanelFolder(&vRefNum, &dirID); |
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refnum = SearchFolderForDNRP('cdev', 'mtcp', vRefNum, dirID); |
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if (refnum != -1) |
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return (refnum); |
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|
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return -1; |
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} |
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|
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OSErr |
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OpenResolver(char *fileName) |
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{ |
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short refnum; |
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OSErr rc; |
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|
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if (dnr != nil) |
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/* resolver already loaded in */ |
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return (noErr); |
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|
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/* |
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* Open the MacTCP driver to get DNR resources. Search for it based on |
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* creator & type rather than simply file name. |
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*/ |
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refnum = OpenOurRF(); |
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|
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/* |
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* Ignore failures since the resource may have been installed in the |
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* System file if running on a Mac 512Ke. |
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*/ |
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|
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/* load in the DNR resource package */ |
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ResrvMem(16000L); /* s-dorner@uiuc.edu, 9/5/91 */ |
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dnr = Get1IndResource('dnrp', 1); |
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if (dnr == nil) { |
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/* can't open DNR */ |
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return (ResError()); |
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} |
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|
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DetachResource(dnr); |
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if (refnum != -1) { |
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CloseWD(refnum); |
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CloseResFile(refnum); |
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} |
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|
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/* lock the DNR resource since it cannot be relocated while opened */ |
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MoveHHi(dnr); |
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HLock(dnr); |
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|
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/* call open resolver */ |
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rc = ((OpenResolverProcPtr)*dnr)(OPENRESOLVER, fileName); |
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if (rc != noErr) { |
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/* problem with open resolver, flush it */ |
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HUnlock(dnr); |
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DisposHandle(dnr); |
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dnr = nil; |
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} |
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|
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return (rc); |
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} |
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|
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OSErr |
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CloseResolver(void) |
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{ |
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if (dnr == nil) |
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/* resolver not loaded error */ |
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return (notOpenErr); |
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|
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/* call close resolver */ |
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(void)((CloseResolverProcPtr)*dnr)(CLOSERESOLVER); |
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|
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/* release the DNR resource package */ |
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HUnlock(dnr); |
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DisposHandle(dnr); |
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dnr = nil; |
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|
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return (noErr); |
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} |
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|
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OSErr |
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StrToAddr(char *hostName, struct hostInfo *rtnStruct, |
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ResultProcPtr resultproc, char *userDataPtr) |
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{ |
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OSErr err; |
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|
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if (dnr == nil) |
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/* resolver not loaded error */ |
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return (notOpenErr); |
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|
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err = ((StrToAddrProcPtr)*dnr)(STRTOADDR, hostName, rtnStruct, |
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resultproc, userDataPtr); |
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return err; |
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} |
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|
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OSErr |
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AddrToStr(unsigned long addr, char *addrStr) |
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{ |
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if (dnr == nil) |
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/* resolver not loaded error */ |
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return (notOpenErr); |
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|
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(void)((AddrToStrProcPtr)*dnr)(ADDRTOSTR, addr, addrStr); |
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return (noErr); |
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} |
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|
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OSErr |
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EnumCache(EnumResultProcPtr enumResultProc, char *userDataPtr) |
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{ |
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if (dnr == nil) |
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/* resolver not loaded error */ |
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return (notOpenErr); |
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|
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return ((EnumCacheProcPtr)*dnr)(ENUMCACHE, enumResultProc, |
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userDataPtr); |
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} |
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|
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OSErr |
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AddrToName(ip_addr addr, struct hostInfo *hostInfoPtr, |
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ResultProcPtr resultProc, char *userDataPtr) |
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{ |
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if (dnr == nil) |
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/* resolver not loaded error */ |
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return (notOpenErr); |
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|
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return ((AddrToNameProcPtr)*dnr)(ADDRTONAME, addr, hostInfoPtr, |
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resultProc, userDataPtr); |
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} |
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|
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#if 0 |
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OSErr |
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HInfo(char *hostName, struct returnRec *returnRecPtr, long resultProc, |
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char *userDataPtr) |
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{ |
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if (dnr == nil) |
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/* resolver not loaded error */ |
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return (notOpenErr); |
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|
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return ((*dnr)(HINFO, hostName, returnRecPtr, resultProc, userDataPtr)); |
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} |
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|
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OSErr |
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MXInfo(char *hostName, struct returnRec *returnRecPtr, long resultProc, |
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char *userDataPtr) |
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{ |
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if (dnr == nil) |
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/* resolver not loaded error */ |
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return (notOpenErr); |
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|
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return ((*dnr)(MXINFO, hostName, returnRecPtr, resultProc, userDataPtr)); |
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} |
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#endif |
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|
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OSErr |
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DNSResolveName(char *name, unsigned long *ipAddress, void (*yielder)(void)) |
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{ |
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OSErr osErr; |
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struct hostInfo aHostInfo; |
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volatile int done = 0; |
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|
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osErr = OpenResolver(nil); |
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if (osErr) |
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return osErr; |
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|
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osErr = StrToAddr(name, &aHostInfo, (ResultProcPtr)StrToAddrMarkDone, |
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(char *)&done); |
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|
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if (osErr == cacheFault) { |
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/* StrToAddrMarkDone will set done when DNS resolution finishes */ |
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while (!done) { |
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if (yielder) |
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yielder(); |
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else |
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SystemTask(); |
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} |
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} |
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|
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if ((aHostInfo.rtnCode == noErr) || (aHostInfo.rtnCode == cacheFault)) { |
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/* use the first IP address for this host */ |
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*ipAddress = aHostInfo.addr[0]; |
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osErr = noErr; |
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} else |
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osErr = aHostInfo.rtnCode; |
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|
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/* leave resolver open for faster lookups in the future */ |
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|
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return osErr; |
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} |