[monitoring-plugins] check_dns: split multiple IP addresses passed in ...

[Rolf Eike Beer]

 Module: monitoring-plugins
 Branch: master
 Commit: ad99755033f33a301abc1815d746644067bc297a
 Author: Rolf Eike Beer <eike at sf-mail.de>
   Date: Mon Nov  2 20:05:56 2020 +0100
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=ad99755

check_dns: split multiple IP addresses passed in one -a argument

---

 plugins/check_dns.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/plugins/check_dns.c b/plugins/check_dns.c
index b90f50e..0f2e654 100644
--- a/plugins/check_dns.c
+++ b/plugins/check_dns.c
@@ -473,9 +473,23 @@ process_arguments (int argc, char **argv)
     case 'a': /* expected address */
       if (strlen (optarg) >= ADDRESS_LENGTH)
         die (STATE_UNKNOWN, _("Input buffer overflow\n"));
-      expected_address = (char **)realloc(expected_address, (expected_address_cnt+1) * sizeof(char**));
-      expected_address[expected_address_cnt] = strdup(optarg);
-      expected_address_cnt++;
+      if (strchr(optarg, ',') != NULL) {
+	char *comma = strchr(optarg, ',');
+	while (comma != NULL) {
+	  expected_address = (char **)realloc(expected_address, (expected_address_cnt+1) * sizeof(char**));
+	  expected_address[expected_address_cnt] = strndup(optarg, comma - optarg);
+	  expected_address_cnt++;
+	  optarg = comma + 1;
+	  comma = strchr(optarg, ',');
+	}
+	expected_address = (char **)realloc(expected_address, (expected_address_cnt+1) * sizeof(char**));
+	expected_address[expected_address_cnt] = strdup(optarg);
+	expected_address_cnt++;
+      } else {
+	expected_address = (char **)realloc(expected_address, (expected_address_cnt+1) * sizeof(char**));
+	expected_address[expected_address_cnt] = strdup(optarg);
+	expected_address_cnt++;
+      }
       break;
     case 'A': /* expect authority */
       expect_authority = TRUE;