636 lines
15 KiB
C++
636 lines
15 KiB
C++
/* path.cc
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Copyright 2001, 2002, 2003, 2005, 2006, 2007, 2008 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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/* The purpose of this file is to hide all the details about accessing
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Cygwin's mount table, shortcuts, etc. If the format or location of
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the mount table, or the shortcut format changes, this is the file to
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change to match it. */
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#define str(a) #a
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#define scat(a,b) str(a##b)
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#include <windows.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "path.h"
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#include "cygwin/include/cygwin/version.h"
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#include "cygwin/include/sys/mount.h"
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#include "cygwin/include/mntent.h"
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#include "testsuite.h"
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/* Used when treating / and \ as equivalent. */
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#define isslash(ch) \
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({ \
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char __c = (ch); \
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((__c) == '/' || (__c) == '\\'); \
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})
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static const GUID GUID_shortcut
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= { 0x00021401L, 0, 0, 0xc0, 0, 0, 0, 0, 0, 0, 0x46 };
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enum {
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WSH_FLAG_IDLIST = 0x01, /* Contains an ITEMIDLIST. */
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WSH_FLAG_FILE = 0x02, /* Contains a file locator element. */
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WSH_FLAG_DESC = 0x04, /* Contains a description. */
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WSH_FLAG_RELPATH = 0x08, /* Contains a relative path. */
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WSH_FLAG_WD = 0x10, /* Contains a working dir. */
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WSH_FLAG_CMDLINE = 0x20, /* Contains command line args. */
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WSH_FLAG_ICON = 0x40 /* Contains a custom icon. */
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};
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struct win_shortcut_hdr
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{
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DWORD size; /* Header size in bytes. Must contain 0x4c. */
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GUID magic; /* GUID of shortcut files. */
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DWORD flags; /* Content flags. See above. */
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/* The next fields from attr to icon_no are always set to 0 in Cygwin
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and U/Win shortcuts. */
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DWORD attr; /* Target file attributes. */
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FILETIME ctime; /* These filetime items are never touched by the */
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FILETIME mtime; /* system, apparently. Values don't matter. */
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FILETIME atime;
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DWORD filesize; /* Target filesize. */
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DWORD icon_no; /* Icon number. */
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DWORD run; /* Values defined in winuser.h. Use SW_NORMAL. */
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DWORD hotkey; /* Hotkey value. Set to 0. */
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DWORD dummy[2]; /* Future extension probably. Always 0. */
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};
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static bool
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cmp_shortcut_header (win_shortcut_hdr *file_header)
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{
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/* A Cygwin or U/Win shortcut only contains a description and a relpath.
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Cygwin shortcuts also might contain an ITEMIDLIST. The run type is
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always set to SW_NORMAL. */
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return file_header->size == sizeof (win_shortcut_hdr)
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&& !memcmp (&file_header->magic, &GUID_shortcut, sizeof GUID_shortcut)
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&& (file_header->flags & ~WSH_FLAG_IDLIST)
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== (WSH_FLAG_DESC | WSH_FLAG_RELPATH)
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&& file_header->run == SW_NORMAL;
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}
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int
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get_word (HANDLE fh, int offset)
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{
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unsigned short rv;
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unsigned r;
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SetLastError(NO_ERROR);
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if (SetFilePointer (fh, offset, 0, FILE_BEGIN) == INVALID_SET_FILE_POINTER
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&& GetLastError () != NO_ERROR)
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return -1;
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if (!ReadFile (fh, &rv, 2, (DWORD *) &r, 0))
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return -1;
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return rv;
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}
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/*
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* Check the value of GetLastError() to find out whether there was an error.
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*/
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int
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get_dword (HANDLE fh, int offset)
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{
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int rv;
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unsigned r;
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SetLastError(NO_ERROR);
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if (SetFilePointer (fh, offset, 0, FILE_BEGIN) == INVALID_SET_FILE_POINTER
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&& GetLastError () != NO_ERROR)
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return -1;
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if (!ReadFile (fh, &rv, 4, (DWORD *) &r, 0))
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return -1;
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return rv;
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}
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#define EXE_MAGIC ((int)*(unsigned short *)"MZ")
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#define SHORTCUT_MAGIC ((int)*(unsigned short *)"L\0")
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#define SYMLINK_COOKIE "!<symlink>"
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#define SYMLINK_MAGIC ((int)*(unsigned short *)SYMLINK_COOKIE)
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bool
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is_exe (HANDLE fh)
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{
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int magic = get_word (fh, 0x0);
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return magic == EXE_MAGIC;
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}
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bool
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is_symlink (HANDLE fh)
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{
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int magic = get_word (fh, 0x0);
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if (magic != SHORTCUT_MAGIC && magic != SYMLINK_MAGIC)
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return false;
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DWORD got;
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BY_HANDLE_FILE_INFORMATION local;
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if (!GetFileInformationByHandle (fh, &local))
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return false;
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if (magic == SHORTCUT_MAGIC)
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{
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DWORD size;
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if (!local.dwFileAttributes & FILE_ATTRIBUTE_READONLY)
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return false; /* Not a Cygwin symlink. */
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if ((size = GetFileSize (fh, NULL)) > 8192)
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return false; /* Not a Cygwin symlink. */
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char buf[size];
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SetFilePointer (fh, 0, 0, FILE_BEGIN);
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if (!ReadFile (fh, buf, size, &got, 0))
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return false;
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if (got != size || !cmp_shortcut_header ((win_shortcut_hdr *) buf))
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return false; /* Not a Cygwin symlink. */
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/* TODO: check for invalid path contents
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(see symlink_info::check() in ../cygwin/path.cc) */
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}
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else /* magic == SYMLINK_MAGIC */
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{
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if (!local.dwFileAttributes & FILE_ATTRIBUTE_SYSTEM)
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return false; /* Not a Cygwin symlink. */
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char buf[sizeof (SYMLINK_COOKIE) - 1];
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SetFilePointer (fh, 0, 0, FILE_BEGIN);
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if (!ReadFile (fh, buf, sizeof (buf), &got, 0))
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return false;
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if (got != sizeof (buf) ||
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memcmp (buf, SYMLINK_COOKIE, sizeof (buf)) != 0)
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return false; /* Not a Cygwin symlink. */
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}
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return true;
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}
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/* Assumes is_symlink(fh) is true */
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bool
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readlink (HANDLE fh, char *path, int maxlen)
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{
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int got;
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int magic = get_word (fh, 0x0);
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if (magic == SHORTCUT_MAGIC)
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{
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int offset = get_word (fh, 0x4c);
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int slen = get_word (fh, 0x4c + offset + 2);
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if (slen >= maxlen)
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{
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SetLastError (ERROR_FILENAME_EXCED_RANGE);
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return false;
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}
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if (SetFilePointer (fh, 0x4c + offset + 4, 0, FILE_BEGIN) ==
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INVALID_SET_FILE_POINTER && GetLastError () != NO_ERROR)
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return false;
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if (!ReadFile (fh, path, slen, (DWORD *) &got, 0))
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return false;
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else if (got < slen)
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{
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SetLastError (ERROR_READ_FAULT);
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return false;
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}
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else
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path[got] = '\0';
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}
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else if (magic == SYMLINK_MAGIC)
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{
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char cookie_buf[sizeof (SYMLINK_COOKIE) - 1];
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if (SetFilePointer (fh, 0, 0, FILE_BEGIN) == INVALID_SET_FILE_POINTER
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&& GetLastError () != NO_ERROR)
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return false;
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if (!ReadFile (fh, cookie_buf, sizeof (cookie_buf), (DWORD *) &got, 0))
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return false;
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else if (got == sizeof (cookie_buf)
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&& memcmp (cookie_buf, SYMLINK_COOKIE, sizeof (cookie_buf)) == 0)
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{
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if (!ReadFile (fh, path, maxlen, (DWORD *) &got, 0))
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return false;
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else if (got >= maxlen)
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{
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SetLastError (ERROR_FILENAME_EXCED_RANGE);
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path[0] = '\0';
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return false;
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}
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else
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path[got] = '\0';
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}
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}
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else
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return false;
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return true;
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}
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typedef struct mnt
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{
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const char *native;
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char *posix;
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unsigned flags;
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int issys;
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} mnt_t;
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#ifndef TESTSUITE
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static mnt_t mount_table[255];
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#else
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# define TESTSUITE_MOUNT_TABLE
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# include "testsuite.h"
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# undef TESTSUITE_MOUNT_TABLE
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#endif
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struct mnt *root_here = NULL;
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/* These functions aren't called when defined(TESTSUITE) which results
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in a compiler warning. */
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#ifndef TESTSUITE
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static char *
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find2 (HKEY rkey, unsigned *flags, char *what)
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{
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char *retval = 0;
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DWORD retvallen = 0;
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DWORD type;
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HKEY key;
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if (RegOpenKeyEx (rkey, what, 0, KEY_READ, &key) != ERROR_SUCCESS)
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return 0;
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if (RegQueryValueEx (key, "native", 0, &type, 0, &retvallen)
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== ERROR_SUCCESS)
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{
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retval = (char *) malloc (MAX_PATH + 1);
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if (RegQueryValueEx (key, "native", 0, &type, (BYTE *) retval, &retvallen)
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!= ERROR_SUCCESS)
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{
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free (retval);
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retval = 0;
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}
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}
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retvallen = sizeof (flags);
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RegQueryValueEx (key, "flags", 0, &type, (BYTE *)flags, &retvallen);
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RegCloseKey (key);
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return retval;
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}
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static LONG
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get_cygdrive0 (HKEY key, const char *what, void *val, DWORD len)
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{
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LONG status = RegQueryValueEx (key, what, 0, 0, (BYTE *)val, &len);
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return status;
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}
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static mnt *
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get_cygdrive (HKEY key, mnt *m, int issystem)
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{
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if (get_cygdrive0 (key, CYGWIN_INFO_CYGDRIVE_FLAGS, &m->flags,
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sizeof (m->flags)) != ERROR_SUCCESS) {
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free (m->posix);
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return m;
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}
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get_cygdrive0 (key, CYGWIN_INFO_CYGDRIVE_PREFIX, m->posix, MAX_PATH);
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m->native = strdup (".");
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m->issys = issystem;
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return m + 1;
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}
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#endif
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static void
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read_mounts ()
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{
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/* If TESTSUITE is defined, bypass this whole function as a harness
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mount table will be provided. */
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#ifndef TESTSUITE
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DWORD posix_path_size;
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int res;
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struct mnt *m = mount_table;
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DWORD disposition;
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char buf[10000];
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root_here = NULL;
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for (mnt *m1 = mount_table; m1->posix; m1++)
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{
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free (m1->posix);
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if (m1->native)
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free ((char *) m1->native);
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m1->posix = NULL;
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}
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/* Loop through subkeys */
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/* FIXME: we would like to not check MAX_MOUNTS but the heap in the
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shared area is currently statically allocated so we can't have an
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arbitrarily large number of mounts. */
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for (int issystem = 0; issystem <= 1; issystem++)
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{
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sprintf (buf, "Software\\%s\\%s\\%s",
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CYGWIN_INFO_CYGNUS_REGISTRY_NAME,
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CYGWIN_INFO_CYGWIN_REGISTRY_NAME,
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CYGWIN_INFO_CYGWIN_MOUNT_REGISTRY_NAME);
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HKEY key = issystem ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
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if (RegCreateKeyEx (key, buf, 0, (LPTSTR) "Cygwin", 0, KEY_READ,
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0, &key, &disposition) != ERROR_SUCCESS)
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break;
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for (int i = 0; ;i++, m++)
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{
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m->posix = (char *) malloc (MAX_PATH + 1);
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posix_path_size = MAX_PATH;
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/* FIXME: if maximum posix_path_size is 256, we're going to
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run into problems if we ever try to store a mount point that's
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over 256 but is under MAX_PATH. */
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res = RegEnumKeyEx (key, i, m->posix, &posix_path_size, NULL,
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NULL, NULL, NULL);
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if (res == ERROR_NO_MORE_ITEMS)
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{
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m = get_cygdrive (key, m, issystem);
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m->posix = NULL;
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break;
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}
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if (!*m->posix)
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goto no_go;
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else if (res != ERROR_SUCCESS)
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break;
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else
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{
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m->native = find2 (key, &m->flags, m->posix);
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m->issys = issystem;
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if (!m->native)
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goto no_go;
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}
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continue;
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no_go:
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free (m->posix);
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m->posix = NULL;
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m--;
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}
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RegCloseKey (key);
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}
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#endif /* !defined(TESTSUITE) */
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}
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/* Return non-zero if PATH1 is a prefix of PATH2.
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Both are assumed to be of the same path style and / vs \ usage.
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Neither may be "".
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LEN1 = strlen (PATH1). It's passed because often it's already known.
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Examples:
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/foo/ is a prefix of /foo <-- may seem odd, but desired
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/foo is a prefix of /foo/
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/ is a prefix of /foo/bar
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/ is not a prefix of foo/bar
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foo/ is a prefix foo/bar
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/foo is not a prefix of /foobar
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*/
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static int
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path_prefix_p (const char *path1, const char *path2, int len1)
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{
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/* Handle case where PATH1 has trailing '/' and when it doesn't. */
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if (len1 > 0 && isslash (path1[len1 - 1]))
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len1--;
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if (len1 == 0)
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return isslash (path2[0]) && !isslash (path2[1]);
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if (strncasecmp (path1, path2, len1) != 0)
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return 0;
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return isslash (path2[len1]) || path2[len1] == 0 || path1[len1 - 1] == ':';
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}
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static char *
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vconcat (const char *s, va_list v)
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{
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int len;
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char *rv, *arg;
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va_list save_v = v;
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int unc;
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if (!s)
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return 0;
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len = strlen (s);
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unc = isslash (*s) && isslash (s[1]);
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while (1)
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{
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arg = va_arg (v, char *);
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if (arg == 0)
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break;
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len += strlen (arg);
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}
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va_end (v);
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rv = (char *) malloc (len + 1);
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strcpy (rv, s);
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v = save_v;
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while (1)
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{
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arg = va_arg (v, char *);
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if (arg == 0)
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break;
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strcat (rv, arg);
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}
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va_end (v);
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char *d, *p;
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/* concat is only used for urls and files, so we can safely
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canonicalize the results */
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for (p = d = rv; *p; p++)
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{
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*d++ = *p;
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/* special case for URLs */
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if (*p == ':' && p[1] == '/' && p[2] == '/' && p > rv + 1)
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{
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*d++ = *++p;
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*d++ = *++p;
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}
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else if (isslash (*p))
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{
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if (p == rv && unc)
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*d++ = *p++;
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while (p[1] == '/')
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p++;
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}
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}
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*d = 0;
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return rv;
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}
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static char *
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concat (const char *s, ...)
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{
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va_list v;
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va_start (v, s);
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return vconcat (s, v);
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}
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static void
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unconvert_slashes (char* name)
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{
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while ((name = strchr (name, '/')) != NULL)
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*name++ = '\\';
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}
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static char *
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rel_vconcat (const char *s, va_list v)
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{
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char path[MAX_PATH + 1];
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if (!GetCurrentDirectory (MAX_PATH, path))
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return NULL;
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int max_len = -1;
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struct mnt *m, *match = NULL;
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if (s[0] == '.' && isslash (s[1]))
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s += 2;
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for (m = mount_table; m->posix ; m++)
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{
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if (m->flags & MOUNT_CYGDRIVE)
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continue;
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int n = strlen (m->native);
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if (n < max_len || !path_prefix_p (m->native, path, n))
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continue;
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max_len = n;
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match = m;
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}
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char *temppath;
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if (!match)
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// No prefix matched - best effort to return meaningful value.
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temppath = concat (path, "/", s, NULL);
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else if (strcmp (match->posix, "/") != 0)
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// Matched on non-root. Copy matching prefix + remaining 'path'.
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temppath = concat (match->posix, path + max_len, "/", s, NULL);
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else if (path[max_len] == '\0')
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// Matched on root and there's no remaining 'path'.
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temppath = concat ("/", s, NULL);
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else if (isslash (path[max_len]))
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// Matched on root but remaining 'path' starts with a slash anyway.
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temppath = concat (path + max_len, "/", s, NULL);
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else
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temppath = concat ("/", path + max_len, "/", s, NULL);
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char *res = vconcat (temppath, v);
|
|
free (temppath);
|
|
return res;
|
|
}
|
|
|
|
char *
|
|
cygpath (const char *s, ...)
|
|
{
|
|
va_list v;
|
|
int max_len = -1;
|
|
struct mnt *m, *match = NULL;
|
|
|
|
if (!mount_table[0].posix)
|
|
read_mounts ();
|
|
va_start (v, s);
|
|
char *path;
|
|
if (s[0] == '.' && isslash (s[1]))
|
|
s += 2;
|
|
|
|
if (s[0] == '/' || s[1] == ':') /* FIXME: too crude? */
|
|
path = vconcat (s, v);
|
|
else
|
|
path = rel_vconcat (s, v);
|
|
|
|
if (!path)
|
|
return NULL;
|
|
|
|
if (strncmp (path, "/./", 3) == 0)
|
|
memmove (path + 1, path + 3, strlen (path + 3) + 1);
|
|
|
|
for (m = mount_table; m->posix ; m++)
|
|
{
|
|
if (m->flags & MOUNT_CYGDRIVE)
|
|
continue;
|
|
|
|
int n = strlen (m->posix);
|
|
if (n < max_len || !path_prefix_p (m->posix, path, n))
|
|
continue;
|
|
max_len = n;
|
|
match = m;
|
|
}
|
|
|
|
char *native;
|
|
if (match == NULL)
|
|
native = strdup (path);
|
|
else if (max_len == (int) strlen (path))
|
|
native = strdup (match->native);
|
|
else if (isslash (path[max_len]))
|
|
native = concat (match->native, path + max_len, NULL);
|
|
else
|
|
native = concat (match->native, "\\", path + max_len, NULL);
|
|
free (path);
|
|
|
|
unconvert_slashes (native);
|
|
for (char *s = strstr (native + 1, "\\.\\"); s && *s; s = strstr (s, "\\.\\"))
|
|
memmove (s + 1, s + 3, strlen (s + 3) + 1);
|
|
return native;
|
|
}
|
|
|
|
static mnt *m = NULL;
|
|
|
|
extern "C" FILE *
|
|
setmntent (const char *, const char *)
|
|
{
|
|
m = mount_table;
|
|
if (!m->posix)
|
|
read_mounts ();
|
|
return NULL;
|
|
}
|
|
|
|
extern "C" struct mntent *
|
|
getmntent (FILE *)
|
|
{
|
|
static mntent mnt;
|
|
if (!m->posix)
|
|
return NULL;
|
|
|
|
mnt.mnt_fsname = (char *) m->native;
|
|
mnt.mnt_dir = (char *) m->posix;
|
|
if (!mnt.mnt_type)
|
|
mnt.mnt_type = (char *) malloc (1024);
|
|
if (!mnt.mnt_opts)
|
|
mnt.mnt_opts = (char *) malloc (1024);
|
|
if (!m->issys)
|
|
strcpy (mnt.mnt_type, (char *) "user");
|
|
else
|
|
strcpy (mnt.mnt_type, (char *) "system");
|
|
if (!(m->flags & MOUNT_BINARY))
|
|
strcpy (mnt.mnt_opts, (char *) "textmode");
|
|
else
|
|
strcpy (mnt.mnt_opts, (char *) "binmode");
|
|
if (m->flags & MOUNT_CYGWIN_EXEC)
|
|
strcat (mnt.mnt_opts, (char *) ",cygexec");
|
|
else if (m->flags & MOUNT_EXEC)
|
|
strcat (mnt.mnt_opts, (char *) ",exec");
|
|
else if (m->flags & MOUNT_NOTEXEC)
|
|
strcat (mnt.mnt_opts, (char *) ",noexec");
|
|
if (m->flags & MOUNT_ENC)
|
|
strcat (mnt.mnt_opts, ",managed");
|
|
if ((m->flags & MOUNT_CYGDRIVE)) /* cygdrive */
|
|
strcat (mnt.mnt_opts, (char *) ",cygdrive");
|
|
mnt.mnt_freq = 1;
|
|
mnt.mnt_passno = 1;
|
|
m++;
|
|
return &mnt;
|
|
}
|