Initial implementation.

*not* yet thread safe.

lib/dns/include/dns/zt.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 1999  Internet Software Consortium.
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#ifndef	DNS_ZT_H
+#define DNS_ZT_H
+
+#include <isc/lang.h>
+
+#include <isc/mem.h>
+#include <dns/name.h>
+#include <dns/zone.h>
+#include <dns/rbt.h>
+
+typedef struct dns_zt dns_zt_t;
+
+ISC_LANG_BEGINDECLS
+
+dns_result_t dns_zt_create(isc_mem_t *mctx, dns_rdataclass_t rdclass,
+			   dns_zt_t **zt);
+dns_result_t dns_zt_mount_zone(dns_zt_t *zt, dns_zone_t *zone);
+dns_result_t dns_zt_unmount_zone(dns_zt_t *zt, dns_zone_t *zone);
+dns_result_t dns_zt_lookup_zone(dns_zt_t *zt, dns_name_t *name,
+				dns_name_t *foundname, dns_zone_t **zone);
+void dns_zt_destroy(dns_zt_t *zt);
+
+ISC_LANG_ENDDECLS
+
+#endif

lib/dns/zt.c

@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 1999  Internet Software Consortium.
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#include <config.h>
+#include <isc/assertions.h>
+#include <dns/zt.h>
+
+struct dns_zt {
+        unsigned int    	magic;
+	dns_rdataclass_t	rdclass;
+	dns_rbt_t       	*table; 
+	isc_mem_t      		*mctx;
+};
+
+#define ZTMAGIC 0x5a54626cU	/* ZTbl */
+#define VALID_ZT(zt) ((zt) != NULL && (zt)->magic == ZTMAGIC)
+
+static void auto_detach(void *, void *);
+
+dns_result_t
+dns_zt_create(isc_mem_t *mctx, dns_rdataclass_t rdclass, dns_zt_t **zt) {
+	dns_zt_t *new;
+	dns_result_t result;
+
+	REQUIRE(zt != NULL && *zt == NULL);
+	new = isc_mem_get(mctx, sizeof *new);
+	if (new == NULL)
+		return (DNS_R_NOMEMORY);
+
+	result = dns_rbt_create(mctx, auto_detach, NULL, &new->table);
+	if (result != DNS_R_SUCCESS) {
+		isc_mem_put(mctx, new, sizeof *new);
+		return (result);
+	}
+	new->mctx = mctx;
+	new->rdclass = rdclass;
+	new->magic = ZTMAGIC;
+	*zt = new;
+	return (DNS_R_SUCCESS);
+}
+
+dns_result_t
+dns_zt_mount_zone(dns_zt_t *zt, dns_zone_t *zone) {
+	dns_result_t result;
+	dns_zone_t *dummy = NULL;
+
+	REQUIRE(VALID_ZT(zt));
+
+	dns_zone_attach(zone, &dummy);
+	result = dns_rbt_addname(zt->table, dns_zone_getorigin(zone), zone);
+	return (result);
+}
+
+dns_result_t
+dns_zt_unmount_zone(dns_zt_t *zt, dns_zone_t *zone) {
+	dns_result_t result;
+
+	REQUIRE(VALID_ZT(zt));
+
+	result = dns_rbt_deletename(zt->table, dns_zone_getorigin(zone),
+				    ISC_FALSE);
+	return (result);
+}
+
+dns_result_t
+dns_zt_lookup_zone(dns_zt_t *zt, dns_name_t *name, dns_name_t *foundname,
+		   dns_zone_t **zone)
+{
+	dns_result_t result;
+
+	REQUIRE(VALID_ZT(zt));
+
+	result = dns_rbt_findname(zt->table, name, foundname, (void **)zone);
+	return (result);
+}
+
+void
+dns_zt_destroy(dns_zt_t *zt) {
+	REQUIRE(VALID_ZT(zt));
+
+	zt->magic = 0;
+	dns_rbt_destroy(&zt->table);
+	isc_mem_put(zt->mctx, zt, sizeof *zt);
+}
+
+static void
+auto_detach(void *zone, void *xxx) {
+	dns_zone_t *dummy = zone;
+
+	xxx = xxx;	/*unused*/
+
+	dns_zone_detach(&dummy);
+}