[PATCH COMMITTED] resolv: Remove IQUERY support

[Florian Weimer]

2017-04-07  Florian Weimer  <fweimer@redhat.com>

	* resolv/res_mkquery.c (res_nmkquery): Remove IQUERY support.

diff --git a/NEWS b/NEWS
index 3590878..28bb008 100644
--- a/NEWS
+++ b/NEWS
@@ -41,6 +41,9 @@ Version 2.26
   "The Rules of Hungarian Orthography, 12th edition" and the work of
   Egmont Koblinger (Bug 18934).
 
+* res_mkquery and res_nmkquery no longer support the IQUERY opcode.  DNS
+  servers have not supported this opcode for a long time.
+
 Security related changes:
 
   [Add security related changes here]
diff --git a/resolv/res_mkquery.c b/resolv/res_mkquery.c
index d80b531..4532b58 100644
--- a/resolv/res_mkquery.c
+++ b/resolv/res_mkquery.c
@@ -188,24 +188,6 @@ res_nmkquery(res_state statp,
 		hp->arcount = htons(1);
 		break;
 
-	case IQUERY:
-		/*
-		 * Initialize answer section
-		 */
-		if (__glibc_unlikely (buflen < 1 + RRFIXEDSZ + datalen))
-			return (-1);
-		*cp++ = '\0';	/* no domain name */
-		NS_PUT16 (type, cp);
-		NS_PUT16 (class, cp);
-		NS_PUT32 (0, cp);
-		NS_PUT16 (datalen, cp);
-		if (datalen) {
-			memcpy(cp, data, datalen);
-			cp += datalen;
-		}
-		hp->ancount = htons(1);
-		break;
-
 	default:
 		return (-1);
 	}