From a03068743f3694cbdbe84bb6e802a41f270cc105 Mon Sep 17 00:00:00 2001
From: Rolf Eike Beer <eike@sf-mail.de>
Date: Wed, 25 Jul 2018 20:18:47 +0200
Subject: check_dns: allow returned addresses to be in any order

---
 NEWS                |  1 +
 THANKS.in           |  1 +
 plugins/check_dns.c | 14 +++++++++-----
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/NEWS b/NEWS
index 2db2a2cb..ac06aa67 100644
--- a/NEWS
+++ b/NEWS
@@ -5,6 +5,7 @@ This file documents the major additions and syntax changes between releases.
 	check_dns: allow 'expected address' (-a) to be specified in CIDR notation
 	  (IPv4 only).
 	check_dns: allow for IPv6 RDNS
+	check_dns: allow unsorted addresses
 	check_apt: add --only-critical switch
 	check_apt: add -l/--list option to print packages
 
diff --git a/THANKS.in b/THANKS.in
index ebc81556..9bb43828 100644
--- a/THANKS.in
+++ b/THANKS.in
@@ -356,3 +356,4 @@ Sven Geggus
 Thomas Kurschel
 Yannick Charton
 Nicolai Søborg
+Rolf Eike Beer
diff --git a/plugins/check_dns.c b/plugins/check_dns.c
index ae4123bf..75a9dcaa 100644
--- a/plugins/check_dns.c
+++ b/plugins/check_dns.c
@@ -230,10 +230,15 @@ main (int argc, char **argv)
     temp_buffer = "";
 
     for (i=0; i<expected_address_cnt; i++) {
+      int j;
       /* check if we get a match on 'raw' ip or cidr */
-      if ( strcmp(address, expected_address[i]) == 0
-           || ip_match_cidr(address, expected_address[i]) )
-        result = STATE_OK;
+      for (j=0; j<n_addresses; j++) {
+        if ( strcmp(addresses[j], expected_address[i]) == 0
+             || ip_match_cidr(addresses[j], expected_address[i]) ) {
+          result = STATE_OK;
+          break;
+        }
+      }
 
       /* prepare an error string */
       xasprintf(&temp_buffer, "%s%s; ", temp_buffer, expected_address[i]);
@@ -530,8 +535,7 @@ print_help (void)
   printf (" -a, --expected-address=IP-ADDRESS|CIDR|HOST\n");
   printf ("    %s\n", _("Optional IP-ADDRESS/CIDR you expect the DNS server to return. HOST must end"));
   printf ("    %s\n", _("with a dot (.). This option can be repeated multiple times (Returns OK if any"));
-  printf ("    %s\n", _("value match). If multiple addresses are returned at once, you have to match"));
-  printf ("    %s\n", _("the whole string of addresses separated with commas (sorted alphabetically)."));
+  printf ("    %s\n", _("value matches)."));
   printf (" -A, --expect-authority\n");
   printf ("    %s\n", _("Optionally expect the DNS server to be authoritative for the lookup"));
   printf (" -w, --warning=seconds\n");
-- 
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