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putty-source/windows/winstore.c
Simon Tatham 1547c9c1ec Make dupcat() into a variadic macro. 
Up until now, it's been a variadic _function_, whose argument list
consists of 'const char *' ASCIZ strings to concatenate, terminated by
one containing a null pointer. Now, that function is dupcat_fn(), and
it's wrapped by a C99 variadic _macro_ called dupcat(), which
automatically suffixes the null-pointer terminating argument.

This has three benefits. Firstly, it's just less effort at every call
site. Secondly, it protects against the risk of accidentally leaving
off the NULL, causing arbitrary words of stack memory to be
dereferenced as char pointers. And thirdly, it protects against the
more subtle risk of writing a bare 'NULL' as the terminating argument,
instead of casting it explicitly to a pointer. That last one is
necessary because C permits the macro NULL to expand to an integer
constant such as 0, so NULL by itself may not have pointer type, and
worse, it may not be marshalled in a variadic argument list in the
same way as a pointer. (For example, on a 64-bit machine it might only
occupy 32 bits. And yet, on another 64-bit platform, it might work
just fine, so that you don't notice the mistake!)

I was inspired to do this by happening to notice one of those bare
NULL terminators, and thinking I'd better check if there were any
more. Turned out there were quite a few. Now there are none.
2019-10-14 19:42:37 +01:00

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/*
* winstore.c: Windows-specific implementation of the interface
* defined in storage.h.
*/
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <assert.h>
#include "putty.h"
#include "storage.h"
#include <shlobj.h>
#ifndef CSIDL_APPDATA
#define CSIDL_APPDATA 0x001a
#endif
#ifndef CSIDL_LOCAL_APPDATA
#define CSIDL_LOCAL_APPDATA 0x001c
#endif
static const char *const reg_jumplist_key = PUTTY_REG_POS "\\Jumplist";
static const char *const reg_jumplist_value = "Recent sessions";
static const char *const puttystr = PUTTY_REG_POS "\\Sessions";
static bool tried_shgetfolderpath = false;
static HMODULE shell32_module = NULL;
DECL_WINDOWS_FUNCTION(static, HRESULT, SHGetFolderPathA,
(HWND, int, HANDLE, DWORD, LPSTR));
struct settings_w {
HKEY sesskey;
};
settings_w *open_settings_w(const char *sessionname, char **errmsg)
{
HKEY subkey1, sesskey;
int ret;
strbuf *sb;
*errmsg = NULL;
if (!sessionname || !*sessionname)
sessionname = "Default Settings";
sb = strbuf_new();
escape_registry_key(sessionname, sb);
ret = RegCreateKey(HKEY_CURRENT_USER, puttystr, &subkey1);
if (ret != ERROR_SUCCESS) {
strbuf_free(sb);
*errmsg = dupprintf("Unable to create registry key\n"
"HKEY_CURRENT_USER\\%s", puttystr);
return NULL;
}
ret = RegCreateKey(subkey1, sb->s, &sesskey);
RegCloseKey(subkey1);
if (ret != ERROR_SUCCESS) {
*errmsg = dupprintf("Unable to create registry key\n"
"HKEY_CURRENT_USER\\%s\\%s", puttystr, sb->s);
strbuf_free(sb);
return NULL;
}
strbuf_free(sb);
settings_w *toret = snew(settings_w);
toret->sesskey = sesskey;
return toret;
}
void write_setting_s(settings_w *handle, const char *key, const char *value)
{
if (handle)
RegSetValueEx(handle->sesskey, key, 0, REG_SZ, (CONST BYTE *)value,
1 + strlen(value));
}
void write_setting_i(settings_w *handle, const char *key, int value)
{
if (handle)
RegSetValueEx(handle->sesskey, key, 0, REG_DWORD,
(CONST BYTE *) &value, sizeof(value));
}
void close_settings_w(settings_w *handle)
{
RegCloseKey(handle->sesskey);
sfree(handle);
}
struct settings_r {
HKEY sesskey;
};
settings_r *open_settings_r(const char *sessionname)
{
HKEY subkey1, sesskey;
strbuf *sb;
if (!sessionname || !*sessionname)
sessionname = "Default Settings";
sb = strbuf_new();
escape_registry_key(sessionname, sb);
if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS) {
sesskey = NULL;
} else {
if (RegOpenKey(subkey1, sb->s, &sesskey) != ERROR_SUCCESS) {
sesskey = NULL;
}
RegCloseKey(subkey1);
}
strbuf_free(sb);
if (!sesskey)
return NULL;
settings_r *toret = snew(settings_r);
toret->sesskey = sesskey;
return toret;
}
char *read_setting_s(settings_r *handle, const char *key)
{
DWORD type, allocsize, size;
char *ret;
if (!handle)
return NULL;
/* Find out the type and size of the data. */
if (RegQueryValueEx(handle->sesskey, key, 0,
&type, NULL, &size) != ERROR_SUCCESS ||
type != REG_SZ)
return NULL;
allocsize = size+1; /* allow for an extra NUL if needed */
ret = snewn(allocsize, char);
if (RegQueryValueEx(handle->sesskey, key, 0,
&type, (BYTE *)ret, &size) != ERROR_SUCCESS ||
type != REG_SZ) {
sfree(ret);
return NULL;
}
assert(size < allocsize);
ret[size] = '\0'; /* add an extra NUL in case RegQueryValueEx
* didn't supply one */
return ret;
}
int read_setting_i(settings_r *handle, const char *key, int defvalue)
{
DWORD type, val, size;
size = sizeof(val);
if (!handle ||
RegQueryValueEx(handle->sesskey, key, 0, &type,
(BYTE *) &val, &size) != ERROR_SUCCESS ||
size != sizeof(val) || type != REG_DWORD)
return defvalue;
else
return val;
}
FontSpec *read_setting_fontspec(settings_r *handle, const char *name)
{
char *settingname;
char *fontname;
FontSpec *ret;
int isbold, height, charset;
fontname = read_setting_s(handle, name);
if (!fontname)
return NULL;
settingname = dupcat(name, "IsBold");
isbold = read_setting_i(handle, settingname, -1);
sfree(settingname);
if (isbold == -1) {
sfree(fontname);
return NULL;
}
settingname = dupcat(name, "CharSet");
charset = read_setting_i(handle, settingname, -1);
sfree(settingname);
if (charset == -1) {
sfree(fontname);
return NULL;
}
settingname = dupcat(name, "Height");
height = read_setting_i(handle, settingname, INT_MIN);
sfree(settingname);
if (height == INT_MIN) {
sfree(fontname);
return NULL;
}
ret = fontspec_new(fontname, isbold, height, charset);
sfree(fontname);
return ret;
}
void write_setting_fontspec(settings_w *handle,
const char *name, FontSpec *font)
{
char *settingname;
write_setting_s(handle, name, font->name);
settingname = dupcat(name, "IsBold");
write_setting_i(handle, settingname, font->isbold);
sfree(settingname);
settingname = dupcat(name, "CharSet");
write_setting_i(handle, settingname, font->charset);
sfree(settingname);
settingname = dupcat(name, "Height");
write_setting_i(handle, settingname, font->height);
sfree(settingname);
}
Filename *read_setting_filename(settings_r *handle, const char *name)
{
char *tmp = read_setting_s(handle, name);
if (tmp) {
Filename *ret = filename_from_str(tmp);
sfree(tmp);
return ret;
} else
return NULL;
}
void write_setting_filename(settings_w *handle,
const char *name, Filename *result)
{
write_setting_s(handle, name, result->path);
}
void close_settings_r(settings_r *handle)
{
if (handle) {
RegCloseKey(handle->sesskey);
sfree(handle);
}
}
void del_settings(const char *sessionname)
{
HKEY subkey1;
strbuf *sb;
if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS)
return;
sb = strbuf_new();
escape_registry_key(sessionname, sb);
RegDeleteKey(subkey1, sb->s);
strbuf_free(sb);
RegCloseKey(subkey1);
remove_session_from_jumplist(sessionname);
}
struct settings_e {
HKEY key;
int i;
};
settings_e *enum_settings_start(void)
{
settings_e *ret;
HKEY key;
if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &key) != ERROR_SUCCESS)
return NULL;
ret = snew(settings_e);
if (ret) {
ret->key = key;
ret->i = 0;
}
return ret;
}
bool enum_settings_next(settings_e *e, strbuf *sb)
{
size_t regbuf_size = MAX_PATH + 1;
char *regbuf = snewn(regbuf_size, char);
bool success;
while (1) {
DWORD retd = RegEnumKey(e->key, e->i, regbuf, regbuf_size);
if (retd != ERROR_MORE_DATA) {
success = (retd == ERROR_SUCCESS);
break;
}
sgrowarray(regbuf, regbuf_size, regbuf_size);
}
if (success)
unescape_registry_key(regbuf, sb);
e->i++;
sfree(regbuf);
return success;
}
void enum_settings_finish(settings_e *e)
{
RegCloseKey(e->key);
sfree(e);
}
static void hostkey_regname(strbuf *sb, const char *hostname,
int port, const char *keytype)
{
strbuf_catf(sb, "%s@%d:", keytype, port);
escape_registry_key(hostname, sb);
}
int verify_host_key(const char *hostname, int port,
const char *keytype, const char *key)
{
char *otherstr;
strbuf *regname;
int len;
HKEY rkey;
DWORD readlen;
DWORD type;
int ret, compare;
len = 1 + strlen(key);
/*
* Now read a saved key in from the registry and see what it
* says.
*/
regname = strbuf_new();
hostkey_regname(regname, hostname, port, keytype);
if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
&rkey) != ERROR_SUCCESS) {
strbuf_free(regname);
return 1; /* key does not exist in registry */
}
readlen = len;
otherstr = snewn(len, char);
ret = RegQueryValueEx(rkey, regname->s, NULL,
&type, (BYTE *)otherstr, &readlen);
if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA &&
!strcmp(keytype, "rsa")) {
/*
* Key didn't exist. If the key type is RSA, we'll try
* another trick, which is to look up the _old_ key format
* under just the hostname and translate that.
*/
char *justhost = regname->s + 1 + strcspn(regname->s, ":");
char *oldstyle = snewn(len + 10, char); /* safety margin */
readlen = len;
ret = RegQueryValueEx(rkey, justhost, NULL, &type,
(BYTE *)oldstyle, &readlen);
if (ret == ERROR_SUCCESS && type == REG_SZ) {
/*
* The old format is two old-style bignums separated by
* a slash. An old-style bignum is made of groups of
* four hex digits: digits are ordered in sensible
* (most to least significant) order within each group,
* but groups are ordered in silly (least to most)
* order within the bignum. The new format is two
* ordinary C-format hex numbers (0xABCDEFG...XYZ, with
* A nonzero except in the special case 0x0, which
* doesn't appear anyway in RSA keys) separated by a
* comma. All hex digits are lowercase in both formats.
*/
char *p = otherstr;
char *q = oldstyle;
int i, j;
for (i = 0; i < 2; i++) {
int ndigits, nwords;
*p++ = '0';
*p++ = 'x';
ndigits = strcspn(q, "/"); /* find / or end of string */
nwords = ndigits / 4;
/* now trim ndigits to remove leading zeros */
while (q[(ndigits - 1) ^ 3] == '0' && ndigits > 1)
ndigits--;
/* now move digits over to new string */
for (j = 0; j < ndigits; j++)
p[ndigits - 1 - j] = q[j ^ 3];
p += ndigits;
q += nwords * 4;
if (*q) {
q++; /* eat the slash */
*p++ = ','; /* add a comma */
}
*p = '\0'; /* terminate the string */
}
/*
* Now _if_ this key matches, we'll enter it in the new
* format. If not, we'll assume something odd went
* wrong, and hyper-cautiously do nothing.
*/
if (!strcmp(otherstr, key))
RegSetValueEx(rkey, regname->s, 0, REG_SZ, (BYTE *)otherstr,
strlen(otherstr) + 1);
}
sfree(oldstyle);
}
RegCloseKey(rkey);
compare = strcmp(otherstr, key);
sfree(otherstr);
strbuf_free(regname);
if (ret == ERROR_MORE_DATA ||
(ret == ERROR_SUCCESS && type == REG_SZ && compare))
return 2; /* key is different in registry */
else if (ret != ERROR_SUCCESS || type != REG_SZ)
return 1; /* key does not exist in registry */
else
return 0; /* key matched OK in registry */
}
bool have_ssh_host_key(const char *hostname, int port,
const char *keytype)
{
/*
* If we have a host key, verify_host_key will return 0 or 2.
* If we don't have one, it'll return 1.
*/
return verify_host_key(hostname, port, keytype, "") != 1;
}
void store_host_key(const char *hostname, int port,
const char *keytype, const char *key)
{
strbuf *regname;
HKEY rkey;
regname = strbuf_new();
hostkey_regname(regname, hostname, port, keytype);
if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
&rkey) == ERROR_SUCCESS) {
RegSetValueEx(rkey, regname->s, 0, REG_SZ,
(BYTE *)key, strlen(key) + 1);
RegCloseKey(rkey);
} /* else key does not exist in registry */
strbuf_free(regname);
}
/*
* Open (or delete) the random seed file.
*/
enum { DEL, OPEN_R, OPEN_W };
static bool try_random_seed(char const *path, int action, HANDLE *ret)
{
if (action == DEL) {
if (!DeleteFile(path) && GetLastError() != ERROR_FILE_NOT_FOUND) {
nonfatal("Unable to delete '%s': %s", path,
win_strerror(GetLastError()));
}
*ret = INVALID_HANDLE_VALUE;
return false; /* so we'll do the next ones too */
}
*ret = CreateFile(path,
action == OPEN_W ? GENERIC_WRITE : GENERIC_READ,
action == OPEN_W ? 0 : (FILE_SHARE_READ |
FILE_SHARE_WRITE),
NULL,
action == OPEN_W ? CREATE_ALWAYS : OPEN_EXISTING,
action == OPEN_W ? FILE_ATTRIBUTE_NORMAL : 0,
NULL);
return (*ret != INVALID_HANDLE_VALUE);
}
static bool try_random_seed_and_free(char *path, int action, HANDLE *hout)
{
bool retd = try_random_seed(path, action, hout);
sfree(path);
return retd;
}
static HANDLE access_random_seed(int action)
{
HKEY rkey;
HANDLE rethandle;
/*
* Iterate over a selection of possible random seed paths until
* we find one that works.
*
* We do this iteration separately for reading and writing,
* meaning that we will automatically migrate random seed files
* if a better location becomes available (by reading from the
* best location in which we actually find one, and then
* writing to the best location in which we can _create_ one).
*/
/*
* First, try the location specified by the user in the
* Registry, if any.
*/
{
char regpath[MAX_PATH + 1];
DWORD type, size = sizeof(regpath);
if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey) ==
ERROR_SUCCESS) {
int ret = RegQueryValueEx(rkey, "RandSeedFile",
0, &type, (BYTE *)regpath, &size);
RegCloseKey(rkey);
if (ret == ERROR_SUCCESS && type == REG_SZ &&
try_random_seed(regpath, action, &rethandle))
return rethandle;
}
}
/*
* Next, try the user's local Application Data directory,
* followed by their non-local one. This is found using the
* SHGetFolderPath function, which won't be present on all
* versions of Windows.
*/
if (!tried_shgetfolderpath) {
/* This is likely only to bear fruit on systems with IE5+
* installed, or WinMe/2K+. There is some faffing with
* SHFOLDER.DLL we could do to try to find an equivalent
* on older versions of Windows if we cared enough.
* However, the invocation below requires IE5+ anyway,
* so stuff that. */
shell32_module = load_system32_dll("shell32.dll");
GET_WINDOWS_FUNCTION(shell32_module, SHGetFolderPathA);
tried_shgetfolderpath = true;
}
if (p_SHGetFolderPathA) {
char profile[MAX_PATH + 1];
if (SUCCEEDED(p_SHGetFolderPathA(NULL, CSIDL_LOCAL_APPDATA,
NULL, SHGFP_TYPE_CURRENT, profile)) &&
try_random_seed_and_free(dupcat(profile, "\\PUTTY.RND"),
action, &rethandle))
return rethandle;
if (SUCCEEDED(p_SHGetFolderPathA(NULL, CSIDL_APPDATA,
NULL, SHGFP_TYPE_CURRENT, profile)) &&
try_random_seed_and_free(dupcat(profile, "\\PUTTY.RND"),
action, &rethandle))
return rethandle;
}
/*
* Failing that, try %HOMEDRIVE%%HOMEPATH% as a guess at the
* user's home directory.
*/
{
char drv[MAX_PATH], path[MAX_PATH];
DWORD drvlen = GetEnvironmentVariable("HOMEDRIVE", drv, sizeof(drv));
DWORD pathlen = GetEnvironmentVariable("HOMEPATH", path, sizeof(path));
/* We permit %HOMEDRIVE% to expand to an empty string, but if
* %HOMEPATH% does that, we abort the attempt. Same if either
* variable overflows its buffer. */
if (drvlen == 0)
drv[0] = '\0';
if (drvlen < lenof(drv) && pathlen < lenof(path) && pathlen > 0 &&
try_random_seed_and_free(
dupcat(drv, path, "\\PUTTY.RND"), action, &rethandle))
return rethandle;
}
/*
* And finally, fall back to C:\WINDOWS.
*/
{
char windir[MAX_PATH];
DWORD len = GetWindowsDirectory(windir, sizeof(windir));
if (len < lenof(windir) &&
try_random_seed_and_free(
dupcat(windir, "\\PUTTY.RND"), action, &rethandle))
return rethandle;
}
/*
* If even that failed, give up.
*/
return INVALID_HANDLE_VALUE;
}
void read_random_seed(noise_consumer_t consumer)
{
HANDLE seedf = access_random_seed(OPEN_R);
if (seedf != INVALID_HANDLE_VALUE) {
while (1) {
char buf[1024];
DWORD len;
if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
consumer(buf, len);
else
break;
}
CloseHandle(seedf);
}
}
void write_random_seed(void *data, int len)
{
HANDLE seedf = access_random_seed(OPEN_W);
if (seedf != INVALID_HANDLE_VALUE) {
DWORD lenwritten;
WriteFile(seedf, data, len, &lenwritten, NULL);
CloseHandle(seedf);
}
}
/*
* Internal function supporting the jump list registry code. All the
* functions to add, remove and read the list have substantially
* similar content, so this is a generalisation of all of them which
* transforms the list in the registry by prepending 'add' (if
* non-null), removing 'rem' from what's left (if non-null), and
* returning the resulting concatenated list of strings in 'out' (if
* non-null).
*/
static int transform_jumplist_registry
(const char *add, const char *rem, char **out)
{
int ret;
HKEY pjumplist_key;
DWORD type;
DWORD value_length;
char *old_value, *new_value;
char *piterator_old, *piterator_new, *piterator_tmp;
ret = RegCreateKeyEx(HKEY_CURRENT_USER, reg_jumplist_key, 0, NULL,
REG_OPTION_NON_VOLATILE, (KEY_READ | KEY_WRITE), NULL,
&pjumplist_key, NULL);
if (ret != ERROR_SUCCESS) {
return JUMPLISTREG_ERROR_KEYOPENCREATE_FAILURE;
}
/* Get current list of saved sessions in the registry. */
value_length = 200;
old_value = snewn(value_length, char);
ret = RegQueryValueEx(pjumplist_key, reg_jumplist_value, NULL, &type,
(BYTE *)old_value, &value_length);
/* When the passed buffer is too small, ERROR_MORE_DATA is
* returned and the required size is returned in the length
* argument. */
if (ret == ERROR_MORE_DATA) {
sfree(old_value);
old_value = snewn(value_length, char);
ret = RegQueryValueEx(pjumplist_key, reg_jumplist_value, NULL, &type,
(BYTE *)old_value, &value_length);
}
if (ret == ERROR_FILE_NOT_FOUND) {
/* Value doesn't exist yet. Start from an empty value. */
*old_value = '\0';
*(old_value + 1) = '\0';
} else if (ret != ERROR_SUCCESS) {
/* Some non-recoverable error occurred. */
sfree(old_value);
RegCloseKey(pjumplist_key);
return JUMPLISTREG_ERROR_VALUEREAD_FAILURE;
} else if (type != REG_MULTI_SZ) {
/* The value present in the registry has the wrong type: we
* try to delete it and start from an empty value. */
ret = RegDeleteValue(pjumplist_key, reg_jumplist_value);
if (ret != ERROR_SUCCESS) {
sfree(old_value);
RegCloseKey(pjumplist_key);
return JUMPLISTREG_ERROR_VALUEREAD_FAILURE;
}
*old_value = '\0';
*(old_value + 1) = '\0';
}
/* Check validity of registry data: REG_MULTI_SZ value must end
* with \0\0. */
piterator_tmp = old_value;
while (((piterator_tmp - old_value) < (value_length - 1)) &&
!(*piterator_tmp == '\0' && *(piterator_tmp+1) == '\0')) {
++piterator_tmp;
}
if ((piterator_tmp - old_value) >= (value_length-1)) {
/* Invalid value. Start from an empty value. */
*old_value = '\0';
*(old_value + 1) = '\0';
}
/*
* Modify the list, if we're modifying.
*/
if (add || rem) {
/* Walk through the existing list and construct the new list of
* saved sessions. */
new_value = snewn(value_length + (add ? strlen(add) + 1 : 0), char);
piterator_new = new_value;
piterator_old = old_value;
/* First add the new item to the beginning of the list. */
if (add) {
strcpy(piterator_new, add);
piterator_new += strlen(piterator_new) + 1;
}
/* Now add the existing list, taking care to leave out the removed
* item, if it was already in the existing list. */
while (*piterator_old != '\0') {
if (!rem || strcmp(piterator_old, rem) != 0) {
/* Check if this is a valid session, otherwise don't add. */
settings_r *psettings_tmp = open_settings_r(piterator_old);
if (psettings_tmp != NULL) {
close_settings_r(psettings_tmp);
strcpy(piterator_new, piterator_old);
piterator_new += strlen(piterator_new) + 1;
}
}
piterator_old += strlen(piterator_old) + 1;
}
*piterator_new = '\0';
++piterator_new;
/* Save the new list to the registry. */
ret = RegSetValueEx(pjumplist_key, reg_jumplist_value, 0, REG_MULTI_SZ,
(BYTE *)new_value, piterator_new - new_value);
sfree(old_value);
old_value = new_value;
} else
ret = ERROR_SUCCESS;
/*
* Either return or free the result.
*/
if (out && ret == ERROR_SUCCESS)
*out = old_value;
else
sfree(old_value);
/* Clean up and return. */
RegCloseKey(pjumplist_key);
if (ret != ERROR_SUCCESS) {
return JUMPLISTREG_ERROR_VALUEWRITE_FAILURE;
} else {
return JUMPLISTREG_OK;
}
}
/* Adds a new entry to the jumplist entries in the registry. */
int add_to_jumplist_registry(const char *item)
{
return transform_jumplist_registry(item, item, NULL);
}
/* Removes an item from the jumplist entries in the registry. */
int remove_from_jumplist_registry(const char *item)
{
return transform_jumplist_registry(NULL, item, NULL);
}
/* Returns the jumplist entries from the registry. Caller must free
* the returned pointer. */
char *get_jumplist_registry_entries (void)
{
char *list_value;
if (transform_jumplist_registry(NULL,NULL,&list_value) != JUMPLISTREG_OK) {
list_value = snewn(2, char);
*list_value = '\0';
*(list_value + 1) = '\0';
}
return list_value;
}
/*
* Recursively delete a registry key and everything under it.
*/
static void registry_recursive_remove(HKEY key)
{
DWORD i;
char name[MAX_PATH + 1];
HKEY subkey;
i = 0;
while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
registry_recursive_remove(subkey);
RegCloseKey(subkey);
}
RegDeleteKey(key, name);
}
}
void cleanup_all(void)
{
HKEY key;
int ret;
char name[MAX_PATH + 1];
/* ------------------------------------------------------------
* Wipe out the random seed file, in all of its possible
* locations.
*/
access_random_seed(DEL);
/* ------------------------------------------------------------
* Ask Windows to delete any jump list information associated
* with this installation of PuTTY.
*/
clear_jumplist();
/* ------------------------------------------------------------
* Destroy all registry information associated with PuTTY.
*/
/*
* Open the main PuTTY registry key and remove everything in it.
*/
if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) ==
ERROR_SUCCESS) {
registry_recursive_remove(key);
RegCloseKey(key);
}
/*
* Now open the parent key and remove the PuTTY main key. Once
* we've done that, see if the parent key has any other
* children.
*/
if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
&key) == ERROR_SUCCESS) {
RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
ret = RegEnumKey(key, 0, name, sizeof(name));
RegCloseKey(key);
/*
* If the parent key had no other children, we must delete
* it in its turn. That means opening the _grandparent_
* key.
*/
if (ret != ERROR_SUCCESS) {
if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
&key) == ERROR_SUCCESS) {
RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
RegCloseKey(key);
}
}
}
/*
* Now we're done.
*/
}
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