static struct db_context *regdb = NULL;
static int regdb_refcount;
+static bool regdb_key_exists(const char *key);
+static bool regdb_key_is_base_key(const char *key);
+
/* List the deepest path into the registry. All part components will be created.*/
/* If you want to have a part of the path controlled by the tdb and part by
{
WERROR werr;
+ if (regdb_key_exists(add_path)) {
+ return WERR_OK;
+ }
+
if (regdb->transaction_start(regdb) != 0) {
DEBUG(0, ("init_registry_key: transaction_start failed\n"));
return WERR_REG_IO_FAILURE;
WERROR init_registry_data(void)
{
WERROR werr;
- TALLOC_CTX *frame = NULL;
+ TALLOC_CTX *frame = talloc_stackframe();
REGVAL_CTR *values;
int i;
UNISTR2 data;
+ /*
+ * First, check for the existence of the needed keys and values.
+ * If all do already exist, we can save the writes.
+ */
+ for (i=0; builtin_registry_paths[i] != NULL; i++) {
+ if (!regdb_key_exists(builtin_registry_paths[i])) {
+ goto do_init;
+ }
+ }
+
+ for (i=0; builtin_registry_values[i].path != NULL; i++) {
+ values = TALLOC_ZERO_P(frame, REGVAL_CTR);
+ if (values == NULL) {
+ werr = WERR_NOMEM;
+ goto done;
+ }
+
+ regdb_fetch_values(builtin_registry_values[i].path, values);
+ if (!regval_ctr_key_exists(values,
+ builtin_registry_values[i].valuename))
+ {
+ TALLOC_FREE(values);
+ goto do_init;
+ }
+
+ TALLOC_FREE(values);
+ }
+
+ werr = WERR_OK;
+ goto done;
+
+do_init:
+
/*
* There are potentially quite a few store operations which are all
* indiviually wrapped in tdb transactions. Wrapping them in a single
if (regdb->transaction_start(regdb) != 0) {
DEBUG(0, ("init_registry_data: tdb_transaction_start "
"failed\n"));
- return WERR_REG_IO_FAILURE;
+ werr = WERR_REG_IO_FAILURE;
+ goto done;
}
/* loop over all of the predefined paths and add each component */
for (i=0; builtin_registry_paths[i] != NULL; i++) {
+ if (regdb_key_exists(builtin_registry_paths[i])) {
+ continue;
+ }
werr = init_registry_key_internal(builtin_registry_paths[i]);
if (!W_ERROR_IS_OK(werr)) {
goto fail;
/* loop over all of the predefined values and add each component */
- frame = talloc_stackframe();
-
for (i=0; builtin_registry_values[i].path != NULL; i++) {
values = TALLOC_ZERO_P(frame, REGVAL_CTR);
TALLOC_FREE(values);
}
- TALLOC_FREE(frame);
-
if (regdb->transaction_commit(regdb) != 0) {
DEBUG(0, ("init_registry_data: Could not commit "
"transaction\n"));
- return WERR_REG_IO_FAILURE;
+ werr = WERR_REG_IO_FAILURE;
+ } else {
+ werr = WERR_OK;
}
- return WERR_OK;
-
- fail:
-
- TALLOC_FREE(frame);
+ goto done;
+fail:
if (regdb->transaction_cancel(regdb) != 0) {
smb_panic("init_registry_data: tdb_transaction_cancel "
"failed\n");
}
+done:
+ TALLOC_FREE(frame);
return werr;
}
return WERR_OK;
}
- regdb = db_open_trans(NULL, state_path("registry.tdb"), 0,
+ regdb = db_open(NULL, state_path("registry.tdb"), 0,
REG_TDB_FLAGS, O_RDWR, 0600);
if (!regdb) {
- regdb = db_open_trans(NULL, state_path("registry.tdb"), 0,
+ regdb = db_open(NULL, state_path("registry.tdb"), 0,
REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
if (!regdb) {
werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
- DEBUG(0,("regdb_init: Failed to open registry %s (%s)\n",
+ DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
state_path("registry.tdb"), strerror(errno) ));
return werr;
}
vers_id, REGVER_V1));
status = dbwrap_trans_store_int32(regdb, vstring, REGVER_V1);
if (!NT_STATUS_IS_OK(status)) {
- DEBUG(0, ("regdb_init: error storing %s = %d: %s\n",
+ DEBUG(1, ("regdb_init: error storing %s = %d: %s\n",
vstring, REGVER_V1, nt_errstr(status)));
return ntstatus_to_werror(status);
} else {
become_root();
- regdb = db_open_trans(NULL, state_path("registry.tdb"), 0,
+ regdb = db_open(NULL, state_path("registry.tdb"), 0,
REG_TDB_FLAGS, O_RDWR, 0600);
if ( !regdb ) {
result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
/* pack all the strings */
for (i=0; i<num_subkeys; i++) {
- len += tdb_pack(buffer+len, buflen-len, "f",
- regsubkey_ctr_specific_key(ctr, i));
- if (len > buflen) {
- /* allocate some extra space */
- buffer = (uint8 *)SMB_REALLOC(buffer, len*2);
+ size_t thistime;
+
+ thistime = tdb_pack(buffer+len, buflen-len, "f",
+ regsubkey_ctr_specific_key(ctr, i));
+ if (len+thistime > buflen) {
+ size_t thistime2;
+ /*
+ * tdb_pack hasn't done anything because of the short
+ * buffer, allocate extra space.
+ */
+ buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
+ (len+thistime)*2);
if(buffer == NULL) {
DEBUG(0, ("regdb_store_keys: Failed to realloc "
- "memory of size [%d]\n", len*2));
+ "memory of size [%u]\n",
+ (unsigned int)(len+thistime)*2));
+ ret = false;
+ goto done;
+ }
+ buflen = (len+thistime)*2;
+ thistime2 = tdb_pack(
+ buffer+len, buflen-len, "f",
+ regsubkey_ctr_specific_key(ctr, i));
+ if (thistime2 != thistime) {
+ DEBUG(0, ("tdb_pack failed\n"));
ret = false;
goto done;
}
- buflen = len*2;
- len = tdb_pack(buffer+len, buflen-len, "f",
- regsubkey_ctr_specific_key(ctr, i));
}
+ len += thistime;
}
/* finally write out the data */
goto done;
}
+ /*
+ * Delete a sorted subkey cache for regdb_key_exists, will be
+ * recreated automatically
+ */
+ keyname = talloc_asprintf(ctx, "%s/%s", REG_SORTED_SUBKEYS_PREFIX,
+ keyname);
+ if (keyname != NULL) {
+ dbwrap_delete_bystring(regdb, keyname);
+ }
+
done:
TALLOC_FREE(ctx);
SAFE_FREE(buffer);
TALLOC_CTX *ctx = talloc_stackframe();
NTSTATUS status;
+ if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
+ goto fail;
+ }
+
/*
* fetch a list of the old subkeys so we can determine if anything has
* changed
regdb_fetch_keys(key, old_subkeys);
- /* store the subkey list for the parent */
-
- if (!regdb_store_keys_internal(key, ctr) ) {
- DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
- "for parent [%s]\n", key));
- goto cancel;
- }
+ /*
+ * Make the store operation as safe as possible without transactions:
+ *
+ * (1) For each subkey removed from ctr compared with old_subkeys:
+ *
+ * (a) First delete the value db entry.
+ *
+ * (b) Next delete the secdesc db record.
+ *
+ * (c) Then delete the subkey list entry.
+ *
+ * (2) Now write the list of subkeys of the parent key,
+ * deleting removed entries and adding new ones.
+ *
+ * (3) Finally create the subkey list entries for the added keys.
+ *
+ * This way if we crash half-way in between deleting the subkeys
+ * and storing the parent's list of subkeys, no old data can pop up
+ * out of the blue when re-adding keys later on.
+ */
- /* now delete removed keys */
+ /* (1) delete removed keys' lists (values/secdesc/subkeys) */
num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
for (i=0; i<num_subkeys; i++) {
continue;
}
- path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
+ /* (a) Delete the value list for this key */
+
+ path = talloc_asprintf(ctx, "%s/%s/%s",
+ REG_VALUE_PREFIX,
+ key,
+ oldkeyname );
if (!path) {
goto cancel;
}
if (!path) {
goto cancel;
}
- status = dbwrap_delete_bystring(regdb, path);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(1, ("Deleting %s failed\n", path));
- goto cancel;
- }
-
+ /* Ignore errors here, we might have no values around */
+ dbwrap_delete_bystring(regdb, path);
TALLOC_FREE(path);
+
+ /* (b) Delete the secdesc for this key */
+
path = talloc_asprintf(ctx, "%s/%s/%s",
- REG_VALUE_PREFIX,
+ REG_SECDESC_PREFIX,
key,
oldkeyname );
if (!path) {
if (!path) {
goto cancel;
}
+ status = dbwrap_delete_bystring(regdb, path);
+ /* Don't fail if there are no values around. */
+ if (!NT_STATUS_IS_OK(status) &&
+ !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND))
+ {
+ DEBUG(1, ("Deleting %s failed: %s\n", path,
+ nt_errstr(status)));
+ goto cancel;
+ }
+ TALLOC_FREE(path);
- /*
- * Ignore errors here, we might have no values around
- */
- dbwrap_delete_bystring(regdb, path);
+ /* (c) Delete the list of subkeys of this key */
+
+ path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
+ if (!path) {
+ goto cancel;
+ }
+ path = normalize_reg_path(ctx, path);
+ if (!path) {
+ goto cancel;
+ }
+ status = dbwrap_delete_bystring(regdb, path);
+ /* Don't fail if the subkey record was not found. */
+ if (!NT_STATUS_IS_OK(status) &&
+ !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND))
+ {
+ DEBUG(1, ("Deleting %s failed: %s\n", path,
+ nt_errstr(status)));
+ goto cancel;
+ }
TALLOC_FREE(path);
}
TALLOC_FREE(old_subkeys);
- /* now create records for any subkeys that don't already exist */
+ /* (2) store the subkey list for the parent */
+
+ if (!regdb_store_keys_internal(key, ctr) ) {
+ DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
+ "for parent [%s]\n", key));
+ goto cancel;
+ }
+
+ /* (3) now create records for any subkeys that don't already exist */
num_subkeys = regsubkey_ctr_numkeys(ctr);
}
+static TDB_DATA regdb_fetch_key_internal(TALLOC_CTX *mem_ctx, const char *key)
+{
+ char *path = NULL;
+ TDB_DATA data;
+
+ path = normalize_reg_path(mem_ctx, key);
+ if (!path) {
+ return make_tdb_data(NULL, 0);
+ }
+
+ data = dbwrap_fetch_bystring(regdb, mem_ctx, path);
+
+ TALLOC_FREE(path);
+ return data;
+}
+
+
+/**
+ * check whether a given key name represents a base key,
+ * i.e one without a subkey separator ('/' or '\').
+ */
+static bool regdb_key_is_base_key(const char *key)
+{
+ TALLOC_CTX *mem_ctx = talloc_stackframe();
+ bool ret = false;
+ char *path;
+
+ if (key == NULL) {
+ goto done;
+ }
+
+ path = normalize_reg_path(mem_ctx, key);
+ if (path == NULL) {
+ DEBUG(0, ("out of memory! (talloc failed)\n"));
+ goto done;
+ }
+
+ if (*path == '\0') {
+ goto done;
+ }
+
+ ret = (strrchr(path, '/') == NULL);
+
+done:
+ TALLOC_FREE(mem_ctx);
+ return ret;
+}
+
+static int cmp_keynames(const void *p1, const void *p2)
+{
+ return StrCaseCmp(*((char **)p1), *((char **)p2));
+}
+
+static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
+{
+ char **sorted_subkeys;
+ REGSUBKEY_CTR *ctr;
+ bool result = false;
+ NTSTATUS status;
+ char *buf;
+ char *p;
+ int i, res;
+ size_t len;
+
+ ctr = talloc(talloc_tos(), REGSUBKEY_CTR);
+ if (ctr == NULL) {
+ return false;
+ }
+
+ res = regdb_fetch_keys(key, ctr);
+ if (res == -1) {
+ goto fail;
+ }
+
+ sorted_subkeys = talloc_array(ctr, char *, ctr->num_subkeys);
+ if (sorted_subkeys == NULL) {
+ goto fail;
+ }
+
+ len = 4 + 4*ctr->num_subkeys;
+
+ for (i = 0; i<ctr->num_subkeys; i++) {
+ sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
+ ctr->subkeys[i]);
+ if (sorted_subkeys[i] == NULL) {
+ goto fail;
+ }
+ len += strlen(sorted_subkeys[i])+1;
+ }
+
+ qsort(sorted_subkeys, ctr->num_subkeys, sizeof(char *), cmp_keynames);
+
+ buf = talloc_array(ctr, char, len);
+ if (buf == NULL) {
+ goto fail;
+ }
+ p = buf + 4 + 4*ctr->num_subkeys;
+
+ SIVAL(buf, 0, ctr->num_subkeys);
+
+ for (i=0; i<ctr->num_subkeys; i++) {
+ ptrdiff_t offset = p - buf;
+ SIVAL(buf, 4 + 4*i, offset);
+ strlcpy(p, sorted_subkeys[i], len-offset);
+ p += strlen(sorted_subkeys[i]) + 1;
+ }
+
+ status = dbwrap_trans_store_bystring(
+ regdb, sorted_keyname, make_tdb_data((uint8_t *)buf, len),
+ TDB_REPLACE);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto fail;
+ }
+
+ result = true;
+ fail:
+ TALLOC_FREE(ctr);
+ return result;
+}
+
+struct scan_subkey_state {
+ char *name;
+ bool scanned;
+ bool found;
+};
+
+static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
+ void *private_data)
+{
+ struct scan_subkey_state *state =
+ (struct scan_subkey_state *)private_data;
+ uint32_t num_subkeys;
+ uint32_t l, u;
+
+ if (data.dsize < sizeof(uint32_t)) {
+ return -1;
+ }
+
+ state->scanned = true;
+ state->found = false;
+
+ tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
+
+ l = 0;
+ u = num_subkeys;
+
+ while (l < u) {
+ uint32_t idx = (l+u)/2;
+ char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
+ int comparison = strcmp(state->name, s);
+
+ if (comparison < 0) {
+ u = idx;
+ } else if (comparison > 0) {
+ l = idx + 1;
+ } else {
+ state->found = true;
+ return 0;
+ }
+ }
+ return 0;
+}
+
+static bool scan_parent_subkeys(const char *parent, const char *name)
+{
+ char *path = NULL;
+ char *key = NULL;
+ struct scan_subkey_state state = { 0, };
+ bool result = false;
+ int res;
+
+ state.name = NULL;
+
+ path = normalize_reg_path(talloc_tos(), parent);
+ if (path == NULL) {
+ goto fail;
+ }
+
+ key = talloc_asprintf(talloc_tos(), "%s/%s",
+ REG_SORTED_SUBKEYS_PREFIX, path);
+ if (key == NULL) {
+ goto fail;
+ }
+
+ state.name = talloc_strdup_upper(talloc_tos(), name);
+ if (state.name == NULL) {
+ goto fail;
+ }
+ state.scanned = false;
+
+ res = regdb->parse_record(regdb, string_term_tdb_data(key),
+ parent_subkey_scanner, &state);
+
+ if (state.scanned) {
+ result = state.found;
+ } else {
+ if (!create_sorted_subkeys(path, key)) {
+ goto fail;
+ }
+ res = regdb->parse_record(regdb, string_term_tdb_data(key),
+ parent_subkey_scanner, &state);
+ if ((res == 0) && (state.scanned)) {
+ result = state.found;
+ }
+ }
+
+ fail:
+ TALLOC_FREE(path);
+ TALLOC_FREE(state.name);
+ return result;
+}
+
+/**
+ * Check for the existence of a key.
+ *
+ * Existence of a key is authoritatively defined by its
+ * existence in the list of subkeys of its parent key.
+ * The exeption of this are keys without a parent key,
+ * i.e. the "base" keys (HKLM, HKCU, ...).
+ */
+static bool regdb_key_exists(const char *key)
+{
+ TALLOC_CTX *mem_ctx = talloc_stackframe();
+ TDB_DATA value;
+ bool ret = false;
+ char *path, *p;
+
+ if (key == NULL) {
+ goto done;
+ }
+
+ path = normalize_reg_path(mem_ctx, key);
+ if (path == NULL) {
+ DEBUG(0, ("out of memory! (talloc failed)\n"));
+ goto done;
+ }
+
+ if (*path == '\0') {
+ goto done;
+ }
+
+ p = strrchr(path, '/');
+ if (p == NULL) {
+ /* this is a base key */
+ value = regdb_fetch_key_internal(mem_ctx, path);
+ ret = (value.dptr != NULL);
+ } else {
+ *p = '\0';
+ ret = scan_parent_subkeys(path, p+1);
+ }
+
+done:
+ TALLOC_FREE(mem_ctx);
+ return ret;
+}
+
+
/***********************************************************************
Retrieve an array of strings containing subkeys. Memory should be
released by the caller.
int regdb_fetch_keys(const char *key, REGSUBKEY_CTR *ctr)
{
- WERROR werr;
- char *path = NULL;
uint32 num_items;
uint8 *buf;
uint32 buflen, len;
DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
- path = talloc_strdup(frame, key);
- if (!path) {
- goto fail;
- }
-
- /* convert to key format */
- path = talloc_string_sub(frame, path, "\\", "/");
- if (!path) {
- goto fail;
+ if (!regdb_key_exists(key)) {
+ goto done;
}
- strupper_m(path);
ctr->seqnum = regdb_get_seqnum();
- value = dbwrap_fetch_bystring(regdb, frame, path);
+ value = regdb_fetch_key_internal(frame, key);
+
+ if (value.dptr == NULL) {
+ DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
+ key));
+ ret = 0;
+ goto done;
+ }
buf = value.dptr;
buflen = value.dsize;
+ len = tdb_unpack( buf, buflen, "d", &num_items);
- if ( !buf ) {
- DEBUG(5,("regdb_fetch_keys: tdb lookup failed to locate key [%s]\n", key));
- goto fail;
- }
+ /*
+ * The following code breaks the abstraction that reg_objects.c sets
+ * up with regsubkey_ctr_addkey(). But if we use that with the current
+ * data structure of ctr->subkeys being an unsorted array, we end up
+ * with an O(n^2) algorithm for retrieving keys from the tdb
+ * file. This is pretty pointless, as we have to trust the data
+ * structure on disk not to have duplicates anyway. The alternative to
+ * breaking this abstraction would be to set up a more sophisticated
+ * data structure in REGSUBKEY_CTR.
+ *
+ * This makes "net conf list" for a registry with >1000 shares
+ * actually usable :-)
+ */
- len = tdb_unpack( buf, buflen, "d", &num_items);
+ ctr->subkeys = talloc_array(ctr, char *, num_items);
+ if (ctr->subkeys == NULL) {
+ DEBUG(5, ("regdb_fetch_keys: could not allocate subkeys\n"));
+ goto done;
+ }
+ ctr->num_subkeys = num_items;
for (i=0; i<num_items; i++) {
len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
- werr = regsubkey_ctr_addkey(ctr, subkeyname);
- if (!W_ERROR_IS_OK(werr)) {
- DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
- "failed: %s\n", dos_errstr(werr)));
- goto fail;
+ ctr->subkeys[i] = talloc_strdup(ctr->subkeys, subkeyname);
+ if (ctr->subkeys[i] == NULL) {
+ DEBUG(5, ("regdb_fetch_keys: could not allocate "
+ "subkeyname\n"));
+ TALLOC_FREE(ctr->subkeys);
+ ctr->num_subkeys = 0;
+ goto done;
}
}
DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
ret = num_items;
- fail:
+done:
TALLOC_FREE(frame);
return ret;
}
char *keystr = NULL;
TALLOC_CTX *ctx = talloc_stackframe();
int ret = 0;
- int dbret = -1;
TDB_DATA value;
DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
- keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
- if (!keystr) {
- return 0;
+ if (!regdb_key_exists(key)) {
+ goto done;
}
- keystr = normalize_reg_path(ctx, keystr);
+
+ keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
if (!keystr) {
goto done;
}
values->seqnum = regdb_get_seqnum();
- dbret = regdb->fetch(regdb, ctx, string_term_tdb_data(keystr), &value);
- if (dbret != 0) {
- goto done;
- }
+ value = regdb_fetch_key_internal(ctx, keystr);
if (!value.dptr) {
/* all keys have zero values by default */
DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
+ if (!regdb_key_exists(key)) {
+ goto done;
+ }
+
ZERO_STRUCT(data);
len = regdb_pack_values(values, data.dptr, data.dsize);
goto done;
}
- status = dbwrap_trans_store(regdb, string_term_tdb_data(keystr), data,
- TDB_REPLACE);
+ status = dbwrap_trans_store_bystring(regdb, keystr, data, TDB_REPLACE);
result = NT_STATUS_IS_OK(status);
DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
+ if (!regdb_key_exists(key)) {
+ err = WERR_BADFILE;
+ goto done;
+ }
+
tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
if (tdbkey == NULL) {
err = WERR_NOMEM;
WERROR err = WERR_NOMEM;
TDB_DATA tdbdata;
+ if (!regdb_key_exists(key)) {
+ err = WERR_BADFILE;
+ goto done;
+ }
+
tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
if (tdbkey == NULL) {
goto done;
if (secdesc == NULL) {
/* assuming a delete */
- status = dbwrap_trans_delete(regdb,
- string_term_tdb_data(tdbkey));
+ status = dbwrap_trans_delete_bystring(regdb, tdbkey);
if (NT_STATUS_IS_OK(status)) {
err = WERR_OK;
} else {
goto done;
}
- status = dbwrap_trans_store(regdb, string_term_tdb_data(tdbkey),
- tdbdata, 0);
+ status = dbwrap_trans_store_bystring(regdb, tdbkey, tdbdata, 0);
if (!NT_STATUS_IS_OK(status)) {
err = ntstatus_to_werror(status);
goto done;
git.samba.org / ira / wip.git / blobdiff