diff options
Diffstat (limited to 'contrib/sdb/time')
| -rw-r--r-- | contrib/sdb/time/timedb.c | 148 | ||||
| -rw-r--r-- | contrib/sdb/time/timedb.h | 18 |
2 files changed, 166 insertions, 0 deletions
diff --git a/contrib/sdb/time/timedb.c b/contrib/sdb/time/timedb.c new file mode 100644 index 0000000..11633ca --- /dev/null +++ b/contrib/sdb/time/timedb.c @@ -0,0 +1,148 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + + +/* + * A simple database driver that enables the server to return the + * current time in a DNS record. + */ + +#include <config.h> + +#include <string.h> +#include <stdio.h> +#include <time.h> + +#include <isc/print.h> +#include <isc/result.h> +#include <isc/util.h> + +#include <dns/sdb.h> + +#include <named/globals.h> + +#include "timedb.h" + +static dns_sdbimplementation_t *timedb = NULL; + +/* + * This database operates on relative names. + * + * "time" and "@" return the time in a TXT record. + * "clock" is a CNAME to "time" + * "current" is a DNAME to "@" (try time.current.time) + */ +#ifdef DNS_CLIENTINFO_VERSION +static isc_result_t +timedb_lookup(const char *zone, const char *name, void *dbdata, + dns_sdblookup_t *lookup, dns_clientinfomethods_t *methods, + dns_clientinfo_t *clientinfo) +#else +static isc_result_t +timedb_lookup(const char *zone, const char *name, void *dbdata, + dns_sdblookup_t *lookup) +#endif /* DNS_CLIENTINFO_VERSION */ +{ + isc_result_t result; + + UNUSED(zone); + UNUSED(dbdata); +#ifdef DNS_CLIENTINFO_VERSION + UNUSED(methods); + UNUSED(clientinfo); +#endif /* DNS_CLIENTINFO_VERSION */ + + if (strcmp(name, "@") == 0 || strcmp(name, "time") == 0) { + time_t now = time(NULL); + char buf[100]; + int n; + + /* + * Call ctime to create the string, put it in quotes, and + * remove the trailing newline. + */ + n = snprintf(buf, sizeof(buf), "\"%s", ctime(&now)); + if (n < 0) + return (ISC_R_FAILURE); + buf[n - 1] = '\"'; + result = dns_sdb_putrr(lookup, "txt", 1, buf); + if (result != ISC_R_SUCCESS) + return (ISC_R_FAILURE); + } else if (strcmp(name, "clock") == 0) { + result = dns_sdb_putrr(lookup, "cname", 1, "time"); + if (result != ISC_R_SUCCESS) + return (ISC_R_FAILURE); + } else if (strcmp(name, "current") == 0) { + result = dns_sdb_putrr(lookup, "dname", 1, "@"); + if (result != ISC_R_SUCCESS) + return (ISC_R_FAILURE); + } else + return (ISC_R_NOTFOUND); + + return (ISC_R_SUCCESS); +} + +/* + * lookup() does not return SOA or NS records, so authority() must be defined. + */ +static isc_result_t +timedb_authority(const char *zone, void *dbdata, dns_sdblookup_t *lookup) { + isc_result_t result; + + UNUSED(zone); + UNUSED(dbdata); + + result = dns_sdb_putsoa(lookup, "localhost.", "root.localhost.", 0); + if (result != ISC_R_SUCCESS) + return (ISC_R_FAILURE); + + result = dns_sdb_putrr(lookup, "ns", 86400, "ns1.localdomain."); + if (result != ISC_R_SUCCESS) + return (ISC_R_FAILURE); + result = dns_sdb_putrr(lookup, "ns", 86400, "ns2.localdomain."); + if (result != ISC_R_SUCCESS) + return (ISC_R_FAILURE); + + return (ISC_R_SUCCESS); +} + +/* + * This zone does not support zone transfer, so allnodes() is NULL. There + * is no database specific data, so create() and destroy() are NULL. + */ +static dns_sdbmethods_t timedb_methods = { + timedb_lookup, + timedb_authority, + NULL, /* allnodes */ + NULL, /* create */ + NULL, /* destroy */ + NULL /* lookup2 */ +}; + +/* + * Wrapper around dns_sdb_register(). + */ +isc_result_t +timedb_init(void) { + unsigned int flags; + flags = DNS_SDBFLAG_RELATIVEOWNER | DNS_SDBFLAG_RELATIVERDATA; + return (dns_sdb_register("time", &timedb_methods, NULL, flags, + ns_g_mctx, &timedb)); +} + +/* + * Wrapper around dns_sdb_unregister(). + */ +void +timedb_clear(void) { + if (timedb != NULL) + dns_sdb_unregister(&timedb); +} diff --git a/contrib/sdb/time/timedb.h b/contrib/sdb/time/timedb.h new file mode 100644 index 0000000..3089988 --- /dev/null +++ b/contrib/sdb/time/timedb.h @@ -0,0 +1,18 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + + +#include <isc/types.h> + +isc_result_t timedb_init(void); + +void timedb_clear(void); + |