/* $NetBSD: ttl.c,v 1.3.4.2 2024/02/29 12:34:34 martin Exp $ */ /* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #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, ®ion); 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, ®ion); 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); }