[master] dig +ttlunits

3829.	[func]		"dig +ttlunits" causes dig to print TTL values
			with time-unit suffixes: w, d, h, m, s for
			weeks, days, hours, minutes, and seconds. (Thanks
			to Tony Finch.) [RT #35823]

CHANGES

@@ -1,3 +1,8 @@
+3829.	[func]		"dig +ttlunits" causes dig to print TTL values
+			with time-unit suffixes: w, d, h, m, s for
+			weeks, days, hours, minutes, and seconds. (Thanks
+			to Tony Finch.) [RT #35823]
+
 3828.	[placeholder]
 
 3827.	[func]		"dnssec-signzone -N date" updates serial number

README

@@ -61,6 +61,9 @@ BIND 9.11.0
 	  in single-line-per-record format.
 	- "dig" now supports sending arbitary EDNS options by specifying
 	  them on the command line.
+	- "dig +ttlunits" causes dig to print TTL values with time-unit
+	  suffixes: w, d, h, m, s for weeks, days, hours, minutes, and
+	  seconds.
 	- "serial-update-format" can now be set to "date". On update,
 	  the serial number will be set to the current date in YYYYMMDDNN
 	  format.

bin/dig/dig.c

@@ -69,7 +69,7 @@ static isc_boolean_t short_form = ISC_FALSE, printcmd = ISC_TRUE,
 	ip6_int = ISC_FALSE, plusquest = ISC_FALSE, pluscomm = ISC_FALSE,
 	multiline = ISC_FALSE, nottl = ISC_FALSE, noclass = ISC_FALSE,
 	onesoa = ISC_FALSE, rrcomments = ISC_FALSE, use_usec = ISC_FALSE,
-	nocrypto = ISC_FALSE;
+	nocrypto = ISC_FALSE, ttlunits = ISC_FALSE;
 static isc_uint32_t splitwidth = 0xffffffff;
 
 /*% opcode text */
@@ -218,6 +218,7 @@ help(void) {
 "                 +[no]short          (Disable everything except short\n"
 "                                      form of answer)\n"
 "                 +[no]ttlid          (Control display of ttls in records)\n"
+"                 +[no]ttlunits       (Display TTLs in human-readable units)\n"
 "                 +[no]all            (Set or clear all display flags)\n"
 "                 +[no]qr             (Print question before sending)\n"
 "                 +[no]nssearch       (Search all authoritative nameservers)\n"
@@ -424,6 +425,8 @@ printrdataset(dns_name_t *owner_name, dns_rdataset_t *rdataset,
 		return(ISC_FALSE);
 
 	styleflags |= DNS_STYLEFLAG_REL_OWNER;
+	if (ttlunits)
+		styleflags |= DNS_STYLEFLAG_TTL_UNITS;
 	if (nottl)
 		styleflags |= DNS_STYLEFLAG_NO_TTL;
 	if (noclass)
@@ -483,6 +486,8 @@ printmessage(dig_query_t *query, dns_message_t *msg, isc_boolean_t headers) {
 		styleflags |= DNS_STYLEFLAG_COMMENT;
 	if (rrcomments)
 		styleflags |= DNS_STYLEFLAG_RRCOMMENT;
+	if (ttlunits)
+		styleflags |= DNS_STYLEFLAG_TTL_UNITS;
 	if (nottl)
 		styleflags |= DNS_STYLEFLAG_NO_TTL;
 	if (noclass)
@@ -1297,9 +1302,18 @@ plus_option(char *option, isc_boolean_t is_batchfile,
 				goto invalid_option;
 			}
 			break;
-		case 't': /* ttlid */
+		case 't':
-			FULLCHECK("ttlid");
+			switch (cmd[3]) {
-			nottl = ISC_TF(!state);
+			case 'i': /* ttlid */
+				FULLCHECK("ttlid");
+				nottl = ISC_TF(!state);
+				break;
+			case 'u': /* ttlunits */
+				FULLCHECK("ttlunits");
+				nottl = ISC_FALSE;
+				ttlunits = ISC_TF(state);
+				break;
+			}
 			break;
 		default:
 			goto invalid_option;

bin/dig/dig.docbook

@@ -510,6 +510,17 @@
           </listitem>
         </varlistentry>
 
+        <varlistentry>
+          <term><option>+[no]ttlunits</option></term>
+          <listitem>
+            <para>
+              Display [do not display] the TTL in friendly human-readable
+              time units of "s", "m", "h", "d", and "w", representing
+              seconds, minutes, hours, days and weeks.  Implies +ttlid.
+            </para>
+          </listitem>
+        </varlistentry>
+
         <varlistentry>
           <term><option>+[no]recurse</option></term>
 	  <listitem>

lib/dns/include/dns/masterdump.h

@@ -106,6 +106,8 @@ typedef struct dns_master_style dns_master_style_t;
 /*% Comment out data by prepending with ";" */
 #define	DNS_STYLEFLAG_COMMENTDATA	0x10000000U
 
+/*% Print TTL with human-readable units. */
+#define DNS_STYLEFLAG_TTL_UNITS		0x20000000U
 
 ISC_LANG_BEGINDECLS
 

lib/dns/include/dns/ttl.h

@@ -38,6 +38,9 @@ ISC_LANG_BEGINDECLS
 isc_result_t
 dns_ttl_totext(isc_uint32_t src, isc_boolean_t verbose,
 	       isc_buffer_t *target);
+isc_result_t
+dns_ttl_totext2(isc_uint32_t src, isc_boolean_t verbose,
+	        isc_boolean_t upcase, isc_buffer_t *target);
 /*%<
  * Output a TTL or other time interval in a human-readable form.
  * The time interval is given as a count of seconds in 'src'.
@@ -48,6 +51,12 @@ dns_ttl_totext(isc_uint32_t src, isc_boolean_t verbose,
  * If 'verbose' is ISC_TRUE, use a verbose style like the SOA comments
  * in "dig", like "1 week 2 days 3 hours 4 minutes 5 seconds".
  *
+ * If 'upcase' is ISC_TRUE, we conform to the BIND 8 style in which
+ * the unit letter is capitalized if there is only a single unit
+ * letter to print (for example, "1m30s", but "2M")
+ *
+ * If 'upcase' is ISC_FALSE, unit letters are always in lower case.
+ *
  * Returns:
  * \li	ISC_R_SUCCESS
  * \li	ISC_R_NOSPACE

lib/dns/masterdump.c

@@ -494,15 +494,25 @@ rdataset_totext(dns_rdataset_t *rdataset,
 			unsigned int length;
 
 			INDENT_TO(ttl_column);
-			length = snprintf(ttlbuf, sizeof(ttlbuf), "%u",
+			if ((ctx->style.flags & DNS_STYLEFLAG_TTL_UNITS) != 0) {
-					  rdataset->ttl);
+				length = target->used;
-			INSIST(length <= sizeof(ttlbuf));
+				result = dns_ttl_totext2(rdataset->ttl,
-			isc_buffer_availableregion(target, &r);
+							ISC_FALSE, ISC_FALSE,
-			if (r.length < length)
+							target);
-				return (ISC_R_NOSPACE);
+				if (result != ISC_R_SUCCESS)
-			memmove(r.base, ttlbuf, length);
+					return (result);
-			isc_buffer_add(target, length);
+				column += target->used - length;
-			column += length;
+			} else {
+				length = snprintf(ttlbuf, sizeof(ttlbuf), "%u",
+						  rdataset->ttl);
+				INSIST(length <= sizeof(ttlbuf));
+				isc_buffer_availableregion(target, &r);
+				if (r.length < length)
+					return (ISC_R_NOSPACE);
+				memmove(r.base, ttlbuf, length);
+				isc_buffer_add(target, length);
+				column += length;
+			}
 
 			/*
 			 * If the $TTL directive is not in use, the TTL we

lib/dns/ttl.c

@@ -79,6 +79,13 @@ ttlfmt(unsigned int t, const char *s, isc_boolean_t verbose,
  */
 isc_result_t
 dns_ttl_totext(isc_uint32_t src, isc_boolean_t verbose, isc_buffer_t *target) {
+	return (dns_ttl_totext2(src, verbose, ISC_TRUE, target));
+}
+
+isc_result_t
+dns_ttl_totext2(isc_uint32_t src, isc_boolean_t verbose,
+		isc_boolean_t upcase, isc_buffer_t *target)
+{
 	unsigned secs, mins, hours, days, weeks, x;
 
 	secs = src % 60;   src /= 60;
@@ -116,7 +123,7 @@ dns_ttl_totext(isc_uint32_t src, isc_boolean_t verbose, isc_buffer_t *target) {
 	 * in upper case. (Why?  Because BIND 8 does that.
 	 * Presumably it has a reason.)
 	 */
-	if (x == 1 && !verbose) {
+	if (x == 1 && upcase && !verbose) {
 		isc_region_t region;
 		/*
 		 * The unit letter is the last character in the