[sgt/putty] / winstore.c

/*
 * winstore.c: Windows-specific implementation of the interface
 * defined in storage.h.
 */

#include <windows.h>
#include <stdio.h>
#include "putty.h"
#include "storage.h"

static const char *const puttystr = PUTTY_REG_POS "\\Sessions";

static char seedpath[2*MAX_PATH+10] = "\0";

static char hex[16] = "0123456789ABCDEF";

static void mungestr(char *in, char *out) {
    int candot = 0;

    while (*in) {
	if (*in == ' ' || *in == '\\' || *in == '*' || *in == '?' ||
	    *in == '%' || *in < ' ' || *in > '~' || (*in == '.' && !candot)) {
	    *out++ = '%';
	    *out++ = hex[((unsigned char)*in) >> 4];
	    *out++ = hex[((unsigned char)*in) & 15];
	} else
	    *out++ = *in;
	in++;
	candot = 1;
    }
    *out = '\0';
    return;
}

static void unmungestr(char *in, char *out, int outlen) {
    while (*in) {
	if (*in == '%' && in[1] && in[2]) {
	    int i, j;

	    i = in[1] - '0'; i -= (i > 9 ? 7 : 0);
	    j = in[2] - '0'; j -= (j > 9 ? 7 : 0);

	    *out++ = (i<<4) + j;
            if (!--outlen) return;
	    in += 3;
	} else {
	    *out++ = *in++;
            if (!--outlen) return;
        }
    }
    *out = '\0';
    return;
}

void *open_settings_w(char *sessionname) {
    HKEY subkey1, sesskey;
    int ret;
    char *p;

    p = malloc(3*strlen(sessionname)+1);
    mungestr(sessionname, p);
    
    ret = RegCreateKey(HKEY_CURRENT_USER, puttystr, &subkey1);
    if (ret != ERROR_SUCCESS) {
        free(p);
        return NULL;
    }
    ret = RegCreateKey(subkey1, p, &sesskey);
    free(p);
    RegCloseKey(subkey1);
    if (ret != ERROR_SUCCESS)
        return NULL;
    return (void *)sesskey;
}

void write_setting_s(void *handle, char *key, char *value) {
    if (handle)
        RegSetValueEx((HKEY)handle, key, 0, REG_SZ, value, 1+strlen(value));
}

void write_setting_i(void *handle, char *key, int value) {
    if (handle)
        RegSetValueEx((HKEY)handle, key, 0, REG_DWORD,
                      (CONST BYTE *)&value, sizeof(value));
}

void close_settings_w(void *handle) {
    RegCloseKey((HKEY)handle);
}

void *open_settings_r(char *sessionname) {
    HKEY subkey1, sesskey;
    char *p;

    p = malloc(3*strlen(sessionname)+1);
    mungestr(sessionname, p);

    if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS) {
	sesskey = NULL;
    } else {
	if (RegOpenKey(subkey1, p, &sesskey) != ERROR_SUCCESS) {
	    sesskey = NULL;
	}
	RegCloseKey(subkey1);
    }

    free(p);

    return (void *)sesskey;
}

char *read_setting_s(void *handle, char *key, char *buffer, int buflen) {
    DWORD type, size;
    size = buflen;

    if (!handle ||
        RegQueryValueEx((HKEY)handle, key, 0,
                        &type, buffer, &size) != ERROR_SUCCESS ||
	type != REG_SZ)
        return NULL;
    else
        return buffer;
}

int read_setting_i(void *handle, char *key, int defvalue) {
    DWORD type, val, size;
    size = sizeof(val);

    if (!handle ||
	RegQueryValueEx((HKEY)handle, key, 0, &type,
			(BYTE *)&val, &size) != ERROR_SUCCESS ||
	size != sizeof(val) || type != REG_DWORD)
	return defvalue;
    else
	return val;
}

void close_settings_r(void *handle) {
    RegCloseKey((HKEY)handle);
}

void del_settings (char *sessionname) {
    HKEY subkey1;
    char *p;

    if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS)
	return;

    p = malloc(3*strlen(sessionname)+1);
    mungestr(sessionname, p);
    RegDeleteKey(subkey1, p);
    free(p);

    RegCloseKey(subkey1);
}

struct enumsettings {
    HKEY key;
    int i;
};

void *enum_settings_start(void) {
    struct enumsettings *ret;
    HKEY key;

    if (RegCreateKey(HKEY_CURRENT_USER, puttystr, &key) != ERROR_SUCCESS)
        return NULL;

    ret = malloc(sizeof(*ret));
    if (ret) {
        ret->key = key;
        ret->i = 0;
    }

    return ret;
}

char *enum_settings_next(void *handle, char *buffer, int buflen) {
    struct enumsettings *e = (struct enumsettings *)handle;
    char *otherbuf;
    otherbuf = malloc(3*buflen);
    if (otherbuf && RegEnumKey(e->key, e->i++, otherbuf,
                               3*buflen) == ERROR_SUCCESS) {
        unmungestr(otherbuf, buffer, buflen);
        free(otherbuf);
        return buffer;
    } else
        return NULL;

}

void enum_settings_finish(void *handle) {
    struct enumsettings *e = (struct enumsettings *)handle;
    RegCloseKey(e->key);
    free(e);
}

static void hostkey_regname(char *buffer, char *hostname,
                            int port, char *keytype) {
    int len;
    strcpy(buffer, keytype);
    strcat(buffer, "@");
    len = strlen(buffer);
    len += sprintf(buffer+len, "%d:", port);
    mungestr(hostname, buffer + strlen(buffer));
}

int verify_host_key(char *hostname, int port, char *keytype, char *key) {
    char *otherstr, *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.
     */
    otherstr = smalloc(len);
    regname = smalloc(3*(strlen(hostname)+strlen(keytype))+15);
    if (!otherstr || !regname)
	fatalbox("Out of memory");

    hostkey_regname(regname, hostname, port, keytype);

    if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
		     &rkey) != ERROR_SUCCESS)
        return 1;                      /* key does not exist in registry */

    readlen = len;
    ret = RegQueryValueEx(rkey, regname, NULL, &type, 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 + 1 + strcspn(regname, ":");
        char *oldstyle = smalloc(len + 10);   /* safety margin */
        readlen = len;
        ret = RegQueryValueEx(rkey, justhost, NULL, &type,
                              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, 0, REG_SZ, otherstr,
                              strlen(otherstr)+1);
        }
    }

    RegCloseKey(rkey);

    compare = strcmp(otherstr, key);

    sfree(otherstr);
    sfree(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 */
}

void store_host_key(char *hostname, int port, char *keytype, char *key) {
    char *regname;
    HKEY rkey;

    regname = smalloc(3*(strlen(hostname)+strlen(keytype))+15);
    if (!regname)
	fatalbox("Out of memory");

    hostkey_regname(regname, hostname, port, keytype);

    if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
		     &rkey) != ERROR_SUCCESS)
        return;                        /* key does not exist in registry */
    RegSetValueEx(rkey, regname, 0, REG_SZ, key,
                  strlen(key)+1);
    RegCloseKey(rkey);
}

/*
 * Find the random seed file path and store it in `seedpath'.
 */
static void get_seedpath(void) {
    HKEY rkey;
    DWORD type, size;

    size = sizeof(seedpath);

    if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey)==ERROR_SUCCESS) {
	int ret = RegQueryValueEx(rkey, "RandSeedFile",
				  0, &type, seedpath, &size);
	if (ret != ERROR_SUCCESS || type != REG_SZ)
	    seedpath[0] = '\0';
	RegCloseKey(rkey);
    } else
	seedpath[0] = '\0';

    if (!seedpath[0]) {
	int len, ret;

	len = GetEnvironmentVariable("HOMEDRIVE", seedpath, sizeof(seedpath));
	ret = GetEnvironmentVariable("HOMEPATH", seedpath+len,
				      sizeof(seedpath)-len);
	if (ret == 0) {		       /* probably win95; store in \WINDOWS */
	    GetWindowsDirectory(seedpath, sizeof(seedpath));
	    len = strlen(seedpath);
	} else
	    len += ret;
	strcpy(seedpath+len, "\\PUTTY.RND");
    }
}

void read_random_seed(noise_consumer_t consumer) {
    HANDLE seedf;

    if (!seedpath[0])
	get_seedpath();

    seedf = CreateFile(seedpath, GENERIC_READ,
		       FILE_SHARE_READ | FILE_SHARE_WRITE,
		       NULL, OPEN_EXISTING, 0, NULL);

    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;

    if (!seedpath[0])
	get_seedpath();

    seedf = CreateFile(seedpath, GENERIC_WRITE, 0,
		       NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

    if (seedf != INVALID_HANDLE_VALUE) {
	DWORD lenwritten;

	WriteFile(seedf, data, len, &lenwritten, NULL);
	CloseHandle(seedf);
    }
}

/*
 * 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.
     */
    if (!seedpath[0])
	get_seedpath();
    remove(seedpath);

    /* ------------------------------------------------------------
     * 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.
     */
}
Commit	Line	Data
d5859615	1	/*
	2	* winstore.c: Windows-specific implementation of the interface
	3	* defined in storage.h.
	4	*/
	5
	6	#include <windows.h>
	7	#include <stdio.h>
	8	#include "putty.h"
	9	#include "storage.h"
	10
d1622aed	11	static const char *const puttystr = PUTTY_REG_POS "\\Sessions";
d1622aed	12
d5859615	13	static char seedpath[2*MAX_PATH+10] = "\0";
	14
	15	static char hex[16] = "0123456789ABCDEF";
	16
	17	static void mungestr(char in, char out) {
	18	int candot = 0;
	19
	20	while (*in) {
	21	if (in == ' ' \|\| in == '\\' \|\| in == '' \|\| *in == '?' \|\|
	22	in == '%' \|\| in < ' ' \|\| in > '~' \|\| (in == '.' && !candot)) {
	23	*out++ = '%';
	24	out++ = hex[((unsigned char)in) >> 4];
	25	out++ = hex[((unsigned char)in) & 15];
	26	} else
	27	out++ = in;
	28	in++;
	29	candot = 1;
	30	}
	31	*out = '\0';
	32	return;
	33	}
	34
d1622aed	35	static void unmungestr(char in, char out, int outlen) {
d5859615	36	while (*in) {
	37	if (*in == '%' && in[1] && in[2]) {
	38	int i, j;
	39
	40	i = in[1] - '0'; i -= (i > 9 ? 7 : 0);
	41	j = in[2] - '0'; j -= (j > 9 ? 7 : 0);
	42
	43	*out++ = (i<<4) + j;
d1622aed	44	if (!--outlen) return;
d5859615	45	in += 3;
d1622aed	46	} else {
d5859615	47	out++ = in++;
d1622aed	48	if (!--outlen) return;
d1622aed	49	}
d5859615	50	}
	51	*out = '\0';
	52	return;
	53	}
	54
d1622aed	55	void open_settings_w(char sessionname) {
	56	HKEY subkey1, sesskey;
	57	int ret;
	58	char *p;
	59
	60	p = malloc(3*strlen(sessionname)+1);
	61	mungestr(sessionname, p);
	62
	63	ret = RegCreateKey(HKEY_CURRENT_USER, puttystr, &subkey1);
	64	if (ret != ERROR_SUCCESS) {
	65	free(p);
	66	return NULL;
	67	}
	68	ret = RegCreateKey(subkey1, p, &sesskey);
	69	free(p);
	70	RegCloseKey(subkey1);
	71	if (ret != ERROR_SUCCESS)
	72	return NULL;
	73	return (void *)sesskey;
	74	}
	75
	76	void write_setting_s(void handle, char key, char *value) {
	77	if (handle)
	78	RegSetValueEx((HKEY)handle, key, 0, REG_SZ, value, 1+strlen(value));
	79	}
	80
	81	void write_setting_i(void handle, char key, int value) {
	82	if (handle)
	83	RegSetValueEx((HKEY)handle, key, 0, REG_DWORD,
	84	(CONST BYTE *)&value, sizeof(value));
	85	}
	86
	87	void close_settings_w(void *handle) {
	88	RegCloseKey((HKEY)handle);
	89	}
	90
	91	void open_settings_r(char sessionname) {
	92	HKEY subkey1, sesskey;
	93	char *p;
	94
	95	p = malloc(3*strlen(sessionname)+1);
	96	mungestr(sessionname, p);
	97
	98	if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS) {
	99	sesskey = NULL;
	100	} else {
	101	if (RegOpenKey(subkey1, p, &sesskey) != ERROR_SUCCESS) {
	102	sesskey = NULL;
	103	}
	104	RegCloseKey(subkey1);
	105	}
	106
	107	free(p);
	108
	109	return (void *)sesskey;
	110	}
	111
	112	char read_setting_s(void handle, char key, char buffer, int buflen) {
	113	DWORD type, size;
	114	size = buflen;
	115
	116	if (!handle \|\|
	117	RegQueryValueEx((HKEY)handle, key, 0,
	118	&type, buffer, &size) != ERROR_SUCCESS \|\|
119	type != REG_SZ)
120	return NULL;
121	else
122	return buffer;
123	}
d5859615	124
d1622aed	125	int read_setting_i(void handle, char key, int defvalue) {
	126	DWORD type, val, size;
	127	size = sizeof(val);
	128
	129	if (!handle \|\|
	130	RegQueryValueEx((HKEY)handle, key, 0, &type,
	131	(BYTE *)&val, &size) != ERROR_SUCCESS \|\|
	132	size != sizeof(val) \|\| type != REG_DWORD)
	133	return defvalue;
	134	else
	135	return val;
	136	}
	137
	138	void close_settings_r(void *handle) {
	139	RegCloseKey((HKEY)handle);
	140	}
	141
	142	void del_settings (char *sessionname) {
	143	HKEY subkey1;
	144	char *p;
	145
	146	if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS)
	147	return;
	148
	149	p = malloc(3*strlen(sessionname)+1);
	150	mungestr(sessionname, p);
	151	RegDeleteKey(subkey1, p);
	152	free(p);
	153
	154	RegCloseKey(subkey1);
	155	}
d5859615	156
d1622aed	157	struct enumsettings {
	158	HKEY key;
	159	int i;
	160	};
	161
	162	void *enum_settings_start(void) {
	163	struct enumsettings *ret;
	164	HKEY key;
	165
	166	if (RegCreateKey(HKEY_CURRENT_USER, puttystr, &key) != ERROR_SUCCESS)
	167	return NULL;
	168
	169	ret = malloc(sizeof(*ret));
	170	if (ret) {
	171	ret->key = key;
	172	ret->i = 0;
	173	}
	174
	175	return ret;
	176	}
	177
	178	char enum_settings_next(void handle, char *buffer, int buflen) {
	179	struct enumsettings e = (struct enumsettings )handle;
	180	char *otherbuf;
	181	otherbuf = malloc(3*buflen);
	182	if (otherbuf && RegEnumKey(e->key, e->i++, otherbuf,
	183	3*buflen) == ERROR_SUCCESS) {
	184	unmungestr(otherbuf, buffer, buflen);
	185	free(otherbuf);
	186	return buffer;
	187	} else
	188	return NULL;
	189
	190	}
	191
	192	void enum_settings_finish(void *handle) {
	193	struct enumsettings e = (struct enumsettings )handle;
	194	RegCloseKey(e->key);
	195	free(e);
	196	}
	197
d4857987	198	static void hostkey_regname(char buffer, char hostname,
	199	int port, char *keytype) {
	200	int len;
	201	strcpy(buffer, keytype);
	202	strcat(buffer, "@");
	203	len = strlen(buffer);
	204	len += sprintf(buffer+len, "%d:", port);
	205	mungestr(hostname, buffer + strlen(buffer));
	206	}
	207
	208	int verify_host_key(char hostname, int port, char keytype, char *key) {
d5859615	209	char otherstr, regname;
	210	int len;
	211	HKEY rkey;
	212	DWORD readlen;
	213	DWORD type;
	214	int ret, compare;
	215
	216	len = 1 + strlen(key);
	217
	218	/*
	219	* Now read a saved key in from the registry and see what it
	220	* says.
	221	*/
	222	otherstr = smalloc(len);
d4857987	223	regname = smalloc(3*(strlen(hostname)+strlen(keytype))+15);
d5859615	224	if (!otherstr \|\| !regname)
	225	fatalbox("Out of memory");
	226
d4857987	227	hostkey_regname(regname, hostname, port, keytype);
d5859615	228
	229	if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
	230	&rkey) != ERROR_SUCCESS)
	231	return 1; /* key does not exist in registry */
	232
	233	readlen = len;
	234	ret = RegQueryValueEx(rkey, regname, NULL, &type, otherstr, &readlen);
	235
	236	if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA &&
	237	!strcmp(keytype, "rsa")) {
	238	/*
	239	* Key didn't exist. If the key type is RSA, we'll try
	240	* another trick, which is to look up the _old_ key format
	241	* under just the hostname and translate that.
	242	*/
d4857987	243	char *justhost = regname + 1 + strcspn(regname, ":");
d5859615	244	char oldstyle = smalloc(len + 10); / safety margin */
	245	readlen = len;
	246	ret = RegQueryValueEx(rkey, justhost, NULL, &type,
	247	oldstyle, &readlen);
	248
	249	if (ret == ERROR_SUCCESS && type == REG_SZ) {
	250	/*
	251	* The old format is two old-style bignums separated by
	252	* a slash. An old-style bignum is made of groups of
	253	* four hex digits: digits are ordered in sensible
	254	* (most to least significant) order within each group,
	255	* but groups are ordered in silly (least to most)
	256	* order within the bignum. The new format is two
	257	* ordinary C-format hex numbers (0xABCDEFG...XYZ, with
	258	* A nonzero except in the special case 0x0, which
	259	* doesn't appear anyway in RSA keys) separated by a
	260	* comma. All hex digits are lowercase in both formats.
	261	*/
	262	char *p = otherstr;
	263	char *q = oldstyle;
	264	int i, j;
	265
	266	for (i = 0; i < 2; i++) {
	267	int ndigits, nwords;
	268	p++ = '0'; p++ = 'x';
	269	ndigits = strcspn(q, "/"); /* find / or end of string */
	270	nwords = ndigits / 4;
	271	/* now trim ndigits to remove leading zeros */
	272	while (q[ (ndigits-1) ^ 3 ] == '0' && ndigits > 1)
	273	ndigits--;
	274	/* now move digits over to new string */
	275	for (j = 0; j < ndigits; j++)
	276	p[ndigits-1-j] = q[j^3];
	277	p += ndigits;
	278	q += nwords*4;
	279	if (*q) {
	280	q++; /* eat the slash */
	281	p++ = ','; / add a comma */
	282	}
	283	p = '\0'; / terminate the string */
	284	}
	285
	286	/*
	287	* Now _if_ this key matches, we'll enter it in the new
	288	* format. If not, we'll assume something odd went
	289	* wrong, and hyper-cautiously do nothing.
	290	*/
	291	if (!strcmp(otherstr, key))
	292	RegSetValueEx(rkey, regname, 0, REG_SZ, otherstr,
	293	strlen(otherstr)+1);
	294	}
	295	}
	296
	297	RegCloseKey(rkey);
	298
	299	compare = strcmp(otherstr, key);
	300
	301	sfree(otherstr);
	302	sfree(regname);
	303
	304	if (ret == ERROR_MORE_DATA \|\|
	305	(ret == ERROR_SUCCESS && type == REG_SZ && compare))
	306	return 2; /* key is different in registry */
	307	else if (ret != ERROR_SUCCESS \|\| type != REG_SZ)
308	return 1; /* key does not exist in registry */
309	else
310	return 0; /* key matched OK in registry */
311	}
312
d4857987	313	void store_host_key(char hostname, int port, char keytype, char *key) {
d5859615	314	char *regname;
	315	HKEY rkey;
	316
d4857987	317	regname = smalloc(3*(strlen(hostname)+strlen(keytype))+15);
d5859615	318	if (!regname)
	319	fatalbox("Out of memory");
	320
d4857987	321	hostkey_regname(regname, hostname, port, keytype);
d5859615	322
	323	if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
	324	&rkey) != ERROR_SUCCESS)
	325	return; /* key does not exist in registry */
	326	RegSetValueEx(rkey, regname, 0, REG_SZ, key,
	327	strlen(key)+1);
	328	RegCloseKey(rkey);
	329	}
	330
	331	/*
	332	* Find the random seed file path and store it in `seedpath'.
	333	*/
	334	static void get_seedpath(void) {
	335	HKEY rkey;
	336	DWORD type, size;
	337
	338	size = sizeof(seedpath);
	339
	340	if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey)==ERROR_SUCCESS) {
	341	int ret = RegQueryValueEx(rkey, "RandSeedFile",
	342	0, &type, seedpath, &size);
	343	if (ret != ERROR_SUCCESS \|\| type != REG_SZ)
	344	seedpath[0] = '\0';
	345	RegCloseKey(rkey);
	346	} else
	347	seedpath[0] = '\0';
	348
	349	if (!seedpath[0]) {
	350	int len, ret;
	351
	352	len = GetEnvironmentVariable("HOMEDRIVE", seedpath, sizeof(seedpath));
	353	ret = GetEnvironmentVariable("HOMEPATH", seedpath+len,
	354	sizeof(seedpath)-len);
	355	if (ret == 0) { /* probably win95; store in \WINDOWS */
	356	GetWindowsDirectory(seedpath, sizeof(seedpath));
	357	len = strlen(seedpath);
	358	} else
	359	len += ret;
	360	strcpy(seedpath+len, "\\PUTTY.RND");
	361	}
	362	}
	363
	364	void read_random_seed(noise_consumer_t consumer) {
	365	HANDLE seedf;
	366
	367	if (!seedpath[0])
	368	get_seedpath();
	369
	370	seedf = CreateFile(seedpath, GENERIC_READ,
	371	FILE_SHARE_READ \| FILE_SHARE_WRITE,
	372	NULL, OPEN_EXISTING, 0, NULL);
	373
	374	if (seedf != INVALID_HANDLE_VALUE) {
	375	while (1) {
	376	char buf[1024];
	377	DWORD len;
	378
	379	if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
	380	consumer(buf, len);
	381	else
	382	break;
	383	}
	384	CloseHandle(seedf);
	385	}
386	}
387
d1622aed	388	void write_random_seed(void *data, int len) {
d5859615	389	HANDLE seedf;
	390
	391	if (!seedpath[0])
	392	get_seedpath();
	393
	394	seedf = CreateFile(seedpath, GENERIC_WRITE, 0,
	395	NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
	396
	397	if (seedf != INVALID_HANDLE_VALUE) {
	398	DWORD lenwritten;
	399
	400	WriteFile(seedf, data, len, &lenwritten, NULL);
	401	CloseHandle(seedf);
	402	}
	403	}
	404
	405	/*
	406	* Recursively delete a registry key and everything under it.
	407	*/
	408	static void registry_recursive_remove(HKEY key) {
	409	DWORD i;
	410	char name[MAX_PATH+1];
	411	HKEY subkey;
	412
	413	i = 0;
	414	while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
	415	if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
	416	registry_recursive_remove(subkey);
	417	RegCloseKey(subkey);
	418	}
	419	RegDeleteKey(key, name);
	420	}
	421	}
	422
	423	void cleanup_all(void) {
	424	HKEY key;
	425	int ret;
	426	char name[MAX_PATH+1];
	427
	428	/* ------------------------------------------------------------
	429	* Wipe out the random seed file.
	430	*/
	431	if (!seedpath[0])
	432	get_seedpath();
	433	remove(seedpath);
	434
	435	/* ------------------------------------------------------------
	436	* Destroy all registry information associated with PuTTY.
	437	*/
	438
	439	/*
	440	* Open the main PuTTY registry key and remove everything in it.
	441	*/
	442	if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) == ERROR_SUCCESS) {
	443	registry_recursive_remove(key);
	444	RegCloseKey(key);
	445	}
	446	/*
	447	* Now open the parent key and remove the PuTTY main key. Once
	448	* we've done that, see if the parent key has any other
	449	* children.
	450	*/
	451	if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
	452	&key) == ERROR_SUCCESS) {
453	RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
454	ret = RegEnumKey(key, 0, name, sizeof(name));
455	RegCloseKey(key);
456	/*
457	* If the parent key had no other children, we must delete
458	* it in its turn. That means opening the _grandparent_
459	* key.
460	*/
461	if (ret != ERROR_SUCCESS) {
462	if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
463	&key) == ERROR_SUCCESS) {
464	RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
465	RegCloseKey(key);
466	}
467	}
468	}
469	/*
470	* Now we're done.
471	*/
472	}