lib/dns/ttl.c

	ttl.c revision 15a44745412679c30a6d022733925af70a38b715
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt/*
99bbb58ce7c172798fecb21d2d12756c159cff14Tinderbox User * Copyright (C) 1999, 2000  Internet Software Consortium.
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt *
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * Permission to use, copy, modify, and distribute this software for any
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * purpose with or without fee is hereby granted, provided that the above
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * copyright notice and this permission notice appear in all copies.
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt *
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt */
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt/* $Id: ttl.c,v 1.19 2000/07/27 09:46:45 tale Exp $ */
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt#include <config.h>
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt#include <ctype.h>
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt#include <stdio.h>
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt#include <stdlib.h>
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt#include <isc/buffer.h>
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt#include <isc/print.h>
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt#include <isc/region.h>
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt#include <isc/string.h>
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt#include <isc/util.h>
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt#include <dns/result.h>
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt#include <dns/ttl.h>
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt#define RETERR(x) do { \
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    isc_result_t _r = (x); \
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    if (_r != ISC_R_SUCCESS) \
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        return (_r); \
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    } while (0)
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Huntstatic isc_result_t bind_ttl(isc_textregion_t *source, isc_uint32_t *ttl);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt/*
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt * Helper for dns_ttl_totext().
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt */
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Huntstatic isc_result_t
75e5062bc524bbd1067cd42d5725e8bbe9f2134aMark Andrewsttlfmt(unsigned int t, const char *s, isc_boolean_t verbose,
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt       isc_boolean_t space, isc_buffer_t *target)
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt{
699f790c49d03a9ef3c3234a72d272bb469203e8Evan Hunt    char tmp[60];
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    size_t len;
dbb012765c735ee0d82dedb116cdc7cf18957814Evan Hunt    isc_region_t region;
acbb301e648b82fcc38b876a44403cf0fe539cc9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    if (verbose)
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        len = snprintf(tmp, sizeof(tmp), "%s%u %s%s",
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt                   space ? " " : "",
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt                   t, s,
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt                   t == 1 ? "" : "s");
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    else
699f790c49d03a9ef3c3234a72d272bb469203e8Evan Hunt        len = snprintf(tmp, sizeof(tmp), "%u%c", t, s[0]);
699f790c49d03a9ef3c3234a72d272bb469203e8Evan Hunt
699f790c49d03a9ef3c3234a72d272bb469203e8Evan Hunt    INSIST(len + 1 <= sizeof tmp);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    isc_buffer_availableregion(target, &region);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    if (len > region.length)
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        return (ISC_R_NOSPACE);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    memcpy(region.base, tmp, len);
699f790c49d03a9ef3c3234a72d272bb469203e8Evan Hunt    isc_buffer_add(target, len);
699f790c49d03a9ef3c3234a72d272bb469203e8Evan Hunt
699f790c49d03a9ef3c3234a72d272bb469203e8Evan Hunt    return (ISC_R_SUCCESS);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt}
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt/*
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt * Derived from bind8 ns_format_ttl().
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt */
699f790c49d03a9ef3c3234a72d272bb469203e8Evan Huntisc_result_t
699f790c49d03a9ef3c3234a72d272bb469203e8Evan Huntdns_ttl_totext(isc_uint32_t src, isc_boolean_t verbose, isc_buffer_t *target) {
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    unsigned secs, mins, hours, days, weeks, x;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    secs = src % 60;   src /= 60;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    mins = src % 60;   src /= 60;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    hours = src % 24;  src /= 24;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    days = src % 7;    src /= 7;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    weeks = src;       src = 0;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    x = 0;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    if (weeks != 0) {
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        RETERR(ttlfmt(weeks, "week", verbose, ISC_TF(x > 0), target));
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        x++;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    }
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    if (days != 0) {
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        RETERR(ttlfmt(days, "day", verbose, ISC_TF(x > 0), target));
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        x++;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    }
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    if (hours != 0) {
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        RETERR(ttlfmt(hours, "hour", verbose, ISC_TF(x > 0), target));
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        x++;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    }
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    if (mins != 0) {
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        RETERR(ttlfmt(mins, "minute", verbose, ISC_TF(x > 0), target));
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        x++;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    }
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    if (secs != 0 ||
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        (weeks == 0 && days == 0 && hours == 0 && mins == 0)) {
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        RETERR(ttlfmt(secs, "second", verbose, ISC_TF(x > 0), target));
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        x++;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    }
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    INSIST (x > 0);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    /*
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt     * If only a single unit letter is printed, print it
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt     * in upper case. (Why?  Because BIND 8 does that.
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt     * Presumably it has a reason.)
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt     */
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    if (x == 1 && !verbose) {
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        isc_region_t region;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        /*
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt         * The unit letter is the last character in the
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt         * used region of the buffer.
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt         *
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt         * toupper() does not need its argument to be masked of cast
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt         * here because region.base is type unsigned char *.
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt         */
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        isc_buffer_usedregion(target, &region);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        region.base[region.length - 1] =
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            toupper(region.base[region.length - 1]);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    }
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    return (ISC_R_SUCCESS);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt}
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Huntisc_result_t
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Huntdns_counter_fromtext(isc_textregion_t *source, isc_uint32_t *ttl) {
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    return (bind_ttl(source, ttl));
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt}
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Huntisc_result_t
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Huntdns_ttl_fromtext(isc_textregion_t *source, isc_uint32_t *ttl) {
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    isc_result_t result;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    result = bind_ttl(source, ttl);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    if (result != ISC_R_SUCCESS)
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        result = DNS_R_BADTTL;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    return (result);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt}
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Huntstatic isc_result_t
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Huntbind_ttl(isc_textregion_t *source, isc_uint32_t *ttl) {
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    isc_uint32_t tmp = 0;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    unsigned long n;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    char *e, *s;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    char buf[64];
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    /*
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt     * Copy the buffer as it may not be NULL terminated.
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt     * No legal counter / ttl is longer that 63 characters.
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt     */
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    if (source->length > sizeof(buf) - 1)
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        return(DNS_R_SYNTAX);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    strncpy(buf, source->base, source->length);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    buf[source->length] = '\0';
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    s = buf;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    do {
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        n = strtoul(s, &e, 10);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        if (s == e)
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            return (DNS_R_SYNTAX);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        switch (*e) {
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        case 'w':
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        case 'W':
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            tmp += n * 7 * 24 * 3600;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            s = e + 1;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            break;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        case 'd':
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        case 'D':
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            tmp += n * 24 * 3600;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            s = e + 1;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            break;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        case 'h':
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        case 'H':
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            tmp += n * 3600;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            s = e + 1;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            break;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        case 'm':
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        case 'M':
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            tmp += n * 60;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            s = e + 1;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            break;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        case 's':
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        case 'S':
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            tmp += n;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            s = e + 1;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            break;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        case '\0':
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            /* Plain number? */
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            if (tmp != 0)
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt                return (DNS_R_SYNTAX);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            tmp = n;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            s = e;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            break;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        default:
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt            return (DNS_R_SYNTAX);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt        }
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    } while (*s != 0);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    *ttl = tmp;
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt    return (ISC_R_SUCCESS);
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt}
ba751492fcc4f161a18b983d4f018a1a52938cb9Evan Hunt