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

1 files 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;