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/* registry.cc: registry interface
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "registry.h"
#include "cygerrno.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "tls_pbuf.h"
#include "ntdll.h"
#include <wchar.h>
/* Opens a key under the appropriate Cygwin key.
Do not use HKCU per MS KB 199190 */
static NTSTATUS
top_key (bool isHKLM, REGSAM access, PHANDLE top)
{
WCHAR rbuf[PATH_MAX], *p;
UNICODE_STRING rpath;
OBJECT_ATTRIBUTES attr;
NTSTATUS status;
InitializeObjectAttributes (&attr, &rpath, OBJ_CASE_INSENSITIVE, NULL, NULL);
if (isHKLM)
{
wcpcpy (rbuf, L"\\Registry\\Machine");
RtlInitUnicodeString (&rpath, rbuf);
status = NtOpenKey (top, access, &attr);
}
else
{
WCHAR name[128];
PCWSTR names[2] = {cygheap->user.get_windows_id (name),
L".DEFAULT"};
p = wcpcpy (rbuf, L"\\Registry\\User\\");
for (int i = 0; i < 2; i++)
{
wcpcpy (p, names[i]);
RtlInitUnicodeString (&rpath, rbuf);
status = NtOpenKey (top, access, &attr);
if (NT_SUCCESS (status))
break;
}
}
return status;
}
reg_key::reg_key (HKEY top, REGSAM access, ...): _disposition (0)
{
va_list av;
va_start (av, access);
build_reg (top, access, av);
va_end (av);
}
reg_key::reg_key (bool isHKLM, REGSAM access, ...): _disposition (0)
{
va_list av;
HANDLE top;
key_is_invalid = top_key (isHKLM, access, &top);
if (NT_SUCCESS (key_is_invalid))
{
new (this) reg_key ((HKEY) top, access, L"SOFTWARE",
_WIDE (CYGWIN_INFO_CYGWIN_REGISTRY_NAME), NULL);
NtClose (top);
if (key_is_invalid)
return;
top = key;
va_start (av, access);
build_reg ((HKEY) top, access, av);
va_end (av);
if (top != key)
NtClose (top);
}
}
void
reg_key::build_reg (HKEY top, REGSAM access, va_list av)
{
PWCHAR name;
HANDLE r;
UNICODE_STRING uname;
OBJECT_ATTRIBUTES attr;
NTSTATUS status;
if (top != HKEY_LOCAL_MACHINE && top != HKEY_CURRENT_USER)
r = (HANDLE) top;
else if (!NT_SUCCESS (top_key (top == HKEY_LOCAL_MACHINE, access, &r)))
return;
key_is_invalid = 0;
while ((name = va_arg (av, PWCHAR)) != NULL)
{
RtlInitUnicodeString (&uname, name);
InitializeObjectAttributes (&attr, &uname,
OBJ_CASE_INSENSITIVE | OBJ_OPENIF, r, NULL);
status = NtCreateKey (&key, access, &attr, 0, NULL,
REG_OPTION_NON_VOLATILE, &_disposition);
if (r != (HANDLE) top)
NtClose (r);
r = key;
if (!NT_SUCCESS (status))
{
key_is_invalid = status;
debug_printf ("failed to create key %S in the registry", &uname);
break;
}
}
}
/* Given the current registry key, return the specific DWORD value
requested. Return def on failure. */
DWORD
reg_key::get_dword (PCWSTR name, DWORD def)
{
if (key_is_invalid)
return def;
NTSTATUS status;
UNICODE_STRING uname;
ULONG size = sizeof (KEY_VALUE_PARTIAL_INFORMATION) + sizeof (DWORD);
ULONG rsize;
PKEY_VALUE_PARTIAL_INFORMATION vbuf = (PKEY_VALUE_PARTIAL_INFORMATION)
alloca (size);
RtlInitUnicodeString (&uname, name);
status = NtQueryValueKey (key, &uname, KeyValuePartialInformation, vbuf,
size, &rsize);
if (status != STATUS_SUCCESS || vbuf->Type != REG_DWORD)
return def;
DWORD *dst = (DWORD *) vbuf->Data;
return *dst;
}
/* Given the current registry key, set a specific DWORD value. */
NTSTATUS
reg_key::set_dword (PCWSTR name, DWORD val)
{
if (key_is_invalid)
return key_is_invalid;
DWORD value = (DWORD) val;
UNICODE_STRING uname;
RtlInitUnicodeString (&uname, name);
return NtSetValueKey (key, &uname, 0, REG_DWORD, &value, sizeof (value));
}
/* Given the current registry key, return the specific string value
requested. Return zero on success, non-zero on failure. */
NTSTATUS
reg_key::get_string (PCWSTR name, PWCHAR dst, size_t max, PCWSTR def)
{
NTSTATUS status;
if (key_is_invalid)
{
status = key_is_invalid;
if (def != NULL)
wcpncpy (dst, def, max);
}
else
{
UNICODE_STRING uname;
ULONG size = sizeof (KEY_VALUE_PARTIAL_INFORMATION) + max * sizeof (WCHAR);
ULONG rsize;
PKEY_VALUE_PARTIAL_INFORMATION vbuf = (PKEY_VALUE_PARTIAL_INFORMATION)
alloca (size);
RtlInitUnicodeString (&uname, name);
status = NtQueryValueKey (key, &uname, KeyValuePartialInformation, vbuf,
size, &rsize);
if (status != STATUS_SUCCESS || vbuf->Type != REG_SZ)
wcpncpy (dst, def, max);
else
wcpncpy (dst, (PWCHAR) vbuf->Data, max);
}
return status;
}
/* Given the current registry key, set a specific string value. */
NTSTATUS
reg_key::set_string (PCWSTR name, PCWSTR src)
{
if (key_is_invalid)
return key_is_invalid;
UNICODE_STRING uname;
RtlInitUnicodeString (&uname, name);
return NtSetValueKey (key, &uname, 0, REG_SZ, (PVOID) src,
(wcslen (src) + 1) * sizeof (WCHAR));
}
reg_key::~reg_key ()
{
if (!key_is_invalid)
NtClose (key);
key_is_invalid = 1;
}
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