00b67f09dd
Also known as ISC bind. This import adds utilities such as host(1), dig(1), and nslookup(1), as well as many other tools and libraries. Change-Id: I035ca46e64f1965d57019e773f4ff0ef035e4aa3
158 lines
4.1 KiB
C
158 lines
4.1 KiB
C
/* $NetBSD: timedb.c,v 1.4 2014/12/10 04:37:57 christos Exp $ */
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/*
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* Copyright (C) 2004, 2007, 2011, 2014 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 2000, 2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Id: timedb.c,v 1.12 2011/10/11 23:46:45 tbox Exp */
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/*
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* A simple database driver that enables the server to return the
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* current time in a DNS record.
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*/
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#include <config.h>
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#include <string.h>
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#include <stdio.h>
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#include <time.h>
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#include <isc/print.h>
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#include <isc/result.h>
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#include <isc/util.h>
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#include <dns/sdb.h>
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#include <named/globals.h>
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#include "timedb.h"
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static dns_sdbimplementation_t *timedb = NULL;
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/*
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* This database operates on relative names.
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*
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* "time" and "@" return the time in a TXT record.
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* "clock" is a CNAME to "time"
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* "current" is a DNAME to "@" (try time.current.time)
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*/
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#ifdef DNS_CLIENTINFO_VERSION
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static isc_result_t
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timedb_lookup(const char *zone, const char *name, void *dbdata,
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dns_sdblookup_t *lookup, dns_clientinfomethods_t *methods,
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dns_clientinfo_t *clientinfo)
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#else
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static isc_result_t
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timedb_lookup(const char *zone, const char *name, void *dbdata,
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dns_sdblookup_t *lookup)
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#endif /* DNS_CLIENTINFO_VERSION */
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{
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isc_result_t result;
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UNUSED(zone);
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UNUSED(dbdata);
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#ifdef DNS_CLIENTINFO_VERSION
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UNUSED(methods);
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UNUSED(clientinfo);
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#endif /* DNS_CLIENTINFO_VERSION */
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if (strcmp(name, "@") == 0 || strcmp(name, "time") == 0) {
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time_t now = time(NULL);
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char buf[100];
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int n;
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/*
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* Call ctime to create the string, put it in quotes, and
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* remove the trailing newline.
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*/
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n = snprintf(buf, sizeof(buf), "\"%s", ctime(&now));
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if (n < 0)
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return (ISC_R_FAILURE);
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buf[n - 1] = '\"';
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result = dns_sdb_putrr(lookup, "txt", 1, buf);
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if (result != ISC_R_SUCCESS)
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return (ISC_R_FAILURE);
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} else if (strcmp(name, "clock") == 0) {
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result = dns_sdb_putrr(lookup, "cname", 1, "time");
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if (result != ISC_R_SUCCESS)
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return (ISC_R_FAILURE);
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} else if (strcmp(name, "current") == 0) {
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result = dns_sdb_putrr(lookup, "dname", 1, "@");
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if (result != ISC_R_SUCCESS)
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return (ISC_R_FAILURE);
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} else
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return (ISC_R_NOTFOUND);
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return (ISC_R_SUCCESS);
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}
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/*
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* lookup() does not return SOA or NS records, so authority() must be defined.
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*/
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static isc_result_t
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timedb_authority(const char *zone, void *dbdata, dns_sdblookup_t *lookup) {
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isc_result_t result;
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UNUSED(zone);
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UNUSED(dbdata);
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result = dns_sdb_putsoa(lookup, "localhost.", "root.localhost.", 0);
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if (result != ISC_R_SUCCESS)
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return (ISC_R_FAILURE);
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result = dns_sdb_putrr(lookup, "ns", 86400, "ns1.localdomain.");
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if (result != ISC_R_SUCCESS)
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return (ISC_R_FAILURE);
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result = dns_sdb_putrr(lookup, "ns", 86400, "ns2.localdomain.");
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if (result != ISC_R_SUCCESS)
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return (ISC_R_FAILURE);
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return (ISC_R_SUCCESS);
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}
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/*
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* This zone does not support zone transfer, so allnodes() is NULL. There
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* is no database specific data, so create() and destroy() are NULL.
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*/
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static dns_sdbmethods_t timedb_methods = {
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timedb_lookup,
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timedb_authority,
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NULL, /* allnodes */
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NULL, /* create */
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NULL, /* destroy */
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NULL /* lookup2 */
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};
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/*
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* Wrapper around dns_sdb_register().
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*/
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isc_result_t
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timedb_init(void) {
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unsigned int flags;
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flags = DNS_SDBFLAG_RELATIVEOWNER | DNS_SDBFLAG_RELATIVERDATA;
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return (dns_sdb_register("time", &timedb_methods, NULL, flags,
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ns_g_mctx, &timedb));
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}
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/*
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* Wrapper around dns_sdb_unregister().
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*/
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void
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timedb_clear(void) {
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if (timedb != NULL)
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dns_sdb_unregister(&timedb);
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}
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