diff options
Diffstat (limited to 'ldb/common/ldb_attributes.c')
| -rw-r--r-- | ldb/common/ldb_attributes.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/ldb/common/ldb_attributes.c b/ldb/common/ldb_attributes.c new file mode 100644 index 000000000..747f24178 --- /dev/null +++ b/ldb/common/ldb_attributes.c @@ -0,0 +1,227 @@ +/* + ldb database library + + Copyright (C) Andrew Tridgell 2005 + + ** NOTE! The following LGPL license applies to the ldb + ** library. This does NOT imply that all of Samba is released + ** under the LGPL + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 3 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, see <http://www.gnu.org/licenses/>. +*/ +/* + register handlers for specific attributes and objectclass relationships + + this allows a backend to store its schema information in any format + it likes (or to not have any schema information at all) while keeping the + message matching logic generic +*/ + +#include "ldb_includes.h" + +/* + add a attribute to the ldb_schema + + if flags contains LDB_ATTR_FLAG_ALLOCATED + the attribute name string will be copied using + talloc_strdup(), otherwise it needs to be a static const + string at least with a lifetime longer than the ldb struct! + + the ldb_schema_syntax structure should be a pointer + to a static const struct or at least it needs to be + a struct with a longer lifetime than the ldb context! + +*/ +int ldb_schema_attribute_add_with_syntax(struct ldb_context *ldb, + const char *attribute, + unsigned flags, + const struct ldb_schema_syntax *syntax) +{ + int i, n; + struct ldb_schema_attribute *a; + + if (!syntax) { + return LDB_ERR_OPERATIONS_ERROR; + } + + n = ldb->schema.num_attributes + 1; + + a = talloc_realloc(ldb, ldb->schema.attributes, + struct ldb_schema_attribute, n); + if (a == NULL) { + ldb_oom(ldb); + return -1; + } + ldb->schema.attributes = a; + + for (i = 0; i < ldb->schema.num_attributes; i++) { + int cmp = ldb_attr_cmp(attribute, a[i].name); + if (cmp == 0) { + /* silently ignore attempts to overwrite fixed attributes */ + if (a[i].flags & LDB_ATTR_FLAG_FIXED) { + return 0; + } + if (a[i].flags & LDB_ATTR_FLAG_ALLOCATED) { + talloc_free(discard_const_p(char, a[i].name)); + } + /* To cancel out increment below */ + ldb->schema.num_attributes--; + break; + } else if (cmp < 0) { + memmove(a+i+1, a+i, sizeof(*a) * (ldb->schema.num_attributes-i)); + break; + } + } + ldb->schema.num_attributes++; + + a[i].name = attribute; + a[i].flags = flags; + a[i].syntax = syntax; + + if (a[i].flags & LDB_ATTR_FLAG_ALLOCATED) { + a[i].name = talloc_strdup(a, a[i].name); + if (a[i].name == NULL) { + ldb_oom(ldb); + return -1; + } + } + + return 0; +} + +static const struct ldb_schema_syntax ldb_syntax_default = { + .name = LDB_SYNTAX_OCTET_STRING, + .ldif_read_fn = ldb_handler_copy, + .ldif_write_fn = ldb_handler_copy, + .canonicalise_fn = ldb_handler_copy, + .comparison_fn = ldb_comparison_binary +}; + +static const struct ldb_schema_attribute ldb_attribute_default = { + .name = NULL, + .flags = 0, + .syntax = &ldb_syntax_default +}; + +/* + return the attribute handlers for a given attribute +*/ +const struct ldb_schema_attribute *ldb_schema_attribute_by_name(struct ldb_context *ldb, + const char *name) +{ + int i, e, b = 0, r; + const struct ldb_schema_attribute *def = &ldb_attribute_default; + + /* as handlers are sorted, '*' must be the first if present */ + if (strcmp(ldb->schema.attributes[0].name, "*") == 0) { + def = &ldb->schema.attributes[0]; + b = 1; + } + + /* do a binary search on the array */ + e = ldb->schema.num_attributes - 1; + + while (b <= e) { + + i = (b + e) / 2; + + r = ldb_attr_cmp(name, ldb->schema.attributes[i].name); + if (r == 0) { + return &ldb->schema.attributes[i]; + } + if (r < 0) { + e = i - 1; + } else { + b = i + 1; + } + + } + + return def; +} + + +/* + add to the list of ldif handlers for this ldb context +*/ +void ldb_schema_attribute_remove(struct ldb_context *ldb, const char *name) +{ + const struct ldb_schema_attribute *a; + int i; + + a = ldb_schema_attribute_by_name(ldb, name); + if (a == NULL || a->name == NULL) { + return; + } + + /* FIXED attributes are never removed */ + if (a->flags & LDB_ATTR_FLAG_FIXED) { + return; + } + + if (a->flags & LDB_ATTR_FLAG_ALLOCATED) { + talloc_free(discard_const_p(char, a->name)); + } + + i = a - ldb->schema.attributes; + if (i < ldb->schema.num_attributes - 1) { + memmove(&ldb->schema.attributes[i], + a+1, sizeof(*a) * (ldb->schema.num_attributes-(i+1))); + } + + ldb->schema.num_attributes--; +} + +/* + setup a attribute handler using a standard syntax +*/ +int ldb_schema_attribute_add(struct ldb_context *ldb, + const char *attribute, + unsigned flags, + const char *syntax) +{ + const struct ldb_schema_syntax *s = ldb_standard_syntax_by_name(ldb, syntax); + return ldb_schema_attribute_add_with_syntax(ldb, attribute, flags, s); +} + +/* + setup the attribute handles for well known attributes +*/ +int ldb_setup_wellknown_attributes(struct ldb_context *ldb) +{ + const struct { + const char *attr; + const char *syntax; + } wellknown[] = { + { "dn", LDB_SYNTAX_DN }, + { "distinguishedName", LDB_SYNTAX_DN }, + { "cn", LDB_SYNTAX_DIRECTORY_STRING }, + { "dc", LDB_SYNTAX_DIRECTORY_STRING }, + { "ou", LDB_SYNTAX_DIRECTORY_STRING }, + { "objectClass", LDB_SYNTAX_OBJECTCLASS } + }; + int i; + int ret; + + for (i=0;i<ARRAY_SIZE(wellknown);i++) { + ret = ldb_schema_attribute_add(ldb, wellknown[i].attr, 0, + wellknown[i].syntax); + if (ret != LDB_SUCCESS) { + return ret; + } + } + + return LDB_SUCCESS; +} + |