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-rw-r--r--lib/dns/ttl.c225
1 files changed, 225 insertions, 0 deletions
diff --git a/lib/dns/ttl.c b/lib/dns/ttl.c
new file mode 100644
index 0000000..86c0372
--- /dev/null
+++ b/lib/dns/ttl.c
@@ -0,0 +1,225 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * 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 https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <ctype.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <isc/buffer.h>
+#include <isc/parseint.h>
+#include <isc/print.h>
+#include <isc/region.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+#include <dns/result.h>
+#include <dns/ttl.h>
+
+#define RETERR(x) \
+ do { \
+ isc_result_t _r = (x); \
+ if (_r != ISC_R_SUCCESS) \
+ return ((_r)); \
+ } while (0)
+
+static isc_result_t
+bind_ttl(isc_textregion_t *source, uint32_t *ttl);
+
+/*
+ * Helper for dns_ttl_totext().
+ */
+static isc_result_t
+ttlfmt(unsigned int t, const char *s, bool verbose, bool space,
+ isc_buffer_t *target) {
+ char tmp[60];
+ unsigned int len;
+ isc_region_t region;
+
+ if (verbose) {
+ len = snprintf(tmp, sizeof(tmp), "%s%u %s%s", space ? " " : "",
+ t, s, t == 1 ? "" : "s");
+ } else {
+ len = snprintf(tmp, sizeof(tmp), "%u%c", t, s[0]);
+ }
+
+ INSIST(len + 1 <= sizeof(tmp));
+ isc_buffer_availableregion(target, &region);
+ if (len > region.length) {
+ return (ISC_R_NOSPACE);
+ }
+ memmove(region.base, tmp, len);
+ isc_buffer_add(target, len);
+
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * Derived from bind8 ns_format_ttl().
+ */
+isc_result_t
+dns_ttl_totext(uint32_t src, bool verbose, bool upcase, isc_buffer_t *target) {
+ unsigned secs, mins, hours, days, weeks, x;
+
+ secs = src % 60;
+ src /= 60;
+ mins = src % 60;
+ src /= 60;
+ hours = src % 24;
+ src /= 24;
+ days = src % 7;
+ src /= 7;
+ weeks = src;
+ src = 0;
+ POST(src);
+
+ x = 0;
+ if (weeks != 0) {
+ RETERR(ttlfmt(weeks, "week", verbose, (x > 0), target));
+ x++;
+ }
+ if (days != 0) {
+ RETERR(ttlfmt(days, "day", verbose, (x > 0), target));
+ x++;
+ }
+ if (hours != 0) {
+ RETERR(ttlfmt(hours, "hour", verbose, (x > 0), target));
+ x++;
+ }
+ if (mins != 0) {
+ RETERR(ttlfmt(mins, "minute", verbose, (x > 0), target));
+ x++;
+ }
+ if (secs != 0 || (weeks == 0 && days == 0 && hours == 0 && mins == 0)) {
+ RETERR(ttlfmt(secs, "second", verbose, (x > 0), target));
+ x++;
+ }
+ INSIST(x > 0);
+ /*
+ * If only a single unit letter is printed, print it
+ * in upper case. (Why? Because BIND 8 does that.
+ * Presumably it has a reason.)
+ */
+ if (x == 1 && upcase && !verbose) {
+ isc_region_t region;
+ /*
+ * The unit letter is the last character in the
+ * used region of the buffer.
+ *
+ * toupper() does not need its argument to be masked of cast
+ * here because region.base is type unsigned char *.
+ */
+ isc_buffer_usedregion(target, &region);
+ region.base[region.length - 1] =
+ toupper(region.base[region.length - 1]);
+ }
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_counter_fromtext(isc_textregion_t *source, uint32_t *ttl) {
+ return (bind_ttl(source, ttl));
+}
+
+isc_result_t
+dns_ttl_fromtext(isc_textregion_t *source, uint32_t *ttl) {
+ isc_result_t result;
+
+ result = bind_ttl(source, ttl);
+ if (result != ISC_R_SUCCESS && result != ISC_R_RANGE) {
+ result = DNS_R_BADTTL;
+ }
+ return (result);
+}
+
+static isc_result_t
+bind_ttl(isc_textregion_t *source, uint32_t *ttl) {
+ uint64_t tmp = 0ULL;
+ uint32_t n;
+ char *s;
+ char buf[64];
+ char nbuf[64]; /* Number buffer */
+
+ /*
+ * Copy the buffer as it may not be NULL terminated.
+ * No legal counter / ttl is longer that 63 characters.
+ */
+ if (source->length > sizeof(buf) - 1) {
+ return (DNS_R_SYNTAX);
+ }
+ /* Copy source->length bytes and NUL terminate. */
+ snprintf(buf, sizeof(buf), "%.*s", (int)source->length, source->base);
+ s = buf;
+
+ do {
+ isc_result_t result;
+
+ char *np = nbuf;
+ while (*s != '\0' && isdigit((unsigned char)*s)) {
+ *np++ = *s++;
+ }
+ *np++ = '\0';
+ INSIST(np - nbuf <= (int)sizeof(nbuf));
+ result = isc_parse_uint32(&n, nbuf, 10);
+ if (result != ISC_R_SUCCESS) {
+ return (DNS_R_SYNTAX);
+ }
+ switch (*s) {
+ case 'w':
+ case 'W':
+ tmp += (uint64_t)n * 7 * 24 * 3600;
+ s++;
+ break;
+ case 'd':
+ case 'D':
+ tmp += (uint64_t)n * 24 * 3600;
+ s++;
+ break;
+ case 'h':
+ case 'H':
+ tmp += (uint64_t)n * 3600;
+ s++;
+ break;
+ case 'm':
+ case 'M':
+ tmp += (uint64_t)n * 60;
+ s++;
+ break;
+ case 's':
+ case 'S':
+ tmp += (uint64_t)n;
+ s++;
+ break;
+ case '\0':
+ /* Plain number? */
+ if (tmp != 0ULL) {
+ return (DNS_R_SYNTAX);
+ }
+ tmp = n;
+ break;
+ default:
+ return (DNS_R_SYNTAX);
+ }
+ } while (*s != '\0');
+
+ if (tmp > 0xffffffffULL) {
+ return (ISC_R_RANGE);
+ }
+
+ *ttl = (uint32_t)(tmp & 0xffffffffUL);
+ return (ISC_R_SUCCESS);
+}