1 files changed, 14 insertions, 6 deletions

diff --git a/plugins/check_snmp.c b/plugins/check_snmp.c
index bf21022..d387104 100644
--- a/plugins/check_snmp.c
+++ b/plugins/check_snmp.c
@@ -62,6 +62,7 @@ const char *email = "nagiosplug-devel@lists.sourceforge.net";
 /* Longopts only arguments */
 #define L_CALCULATE_RATE CHAR_MAX+1
 #define L_RATE_MULTIPLIER CHAR_MAX+2
+#define L_INVERT_SEARCH CHAR_MAX+3
 
 /* Gobble to string - stop incrementing c when c[0] match one of the
  * characters in s */
@@ -115,6 +116,7 @@ char *units;
 char *port;
 char *snmpcmd;
 char string_value[MAX_INPUT_BUFFER] = "";
+int  invert_search=0;
 char **labels = NULL;
 char **unitv = NULL;
 size_t nlabels = 0;
@@ -433,16 +435,16 @@ main (int argc, char **argv)
                 /* Process this block for string matching */
                 else if (eval_method[i] & CRIT_STRING) {
                         if (strcmp (show, string_value))
-                                iresult = STATE_CRITICAL;
+                                iresult = (invert_search==0) ? STATE_CRITICAL : STATE_OK;
                         else
-                                iresult = STATE_OK;
+                                iresult = (invert_search==0) ? STATE_OK : STATE_CRITICAL;
                 }
 
                 /* Process this block for regex matching */
                 else if (eval_method[i] & CRIT_REGEX) {
                         excode = regexec (&preg, response, 10, pmatch, eflags);
                         if (excode == 0) {
-                                iresult = STATE_OK;
+                                iresult = (invert_search==0) ? STATE_OK : STATE_CRITICAL;
                         }
                         else if (excode != REG_NOMATCH) {
                                 regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
@@ -450,7 +452,7 @@ main (int argc, char **argv)
                                 exit (STATE_CRITICAL);
                         }
                         else {
-                                iresult = STATE_CRITICAL;
+                                iresult = (invert_search==0) ? STATE_CRITICAL : STATE_OK;
                         }
                 }
 
@@ -584,6 +586,7 @@ process_arguments (int argc, char **argv)
                 {"next", no_argument, 0, 'n'},
                 {"rate", no_argument, 0, L_CALCULATE_RATE},
                 {"rate-multiplier", required_argument, 0, L_RATE_MULTIPLIER},
+                {"invert-search", no_argument, 0, L_INVERT_SEARCH},
                 {0, 0, 0, 0}
         };
 
@@ -796,6 +799,9 @@ process_arguments (int argc, char **argv)
                         if(!is_integer(optarg)||(rate_multiplier=atoi(optarg)<=0))
                                 usage2(_("Rate multiplier must be a positive integer"),optarg);
                         break;
+                case L_INVERT_SEARCH:
+                        invert_search=1;
+                        break;
                 }
         }
 
@@ -1044,10 +1050,12 @@ print_help (void)
         printf ("    %s\n", _("Return OK state (for that OID) if extended regular expression REGEX matches"));
         printf (" %s\n", "-R, --eregi=REGEX");
         printf ("    %s\n", _("Return OK state (for that OID) if case-insensitive extended REGEX matches"));
-        printf (" %s\n", "-l, --label=STRING");
-        printf ("    %s\n", _("Prefix label for output from plugin (default -l 'SNMP')"));
+        printf (" %s\n", "--invert-search");
+        printf ("    %s\n", _("Invert search result (CRITICAL if found)"));
 
         /* Output Formatting */
+        printf (" %s\n", "-l, --label=STRING");
+        printf ("    %s\n", _("Prefix label for output from plugin"));
         printf (" %s\n", "-u, --units=STRING");
         printf ("    %s\n", _("Units label(s) for output data (e.g., 'sec.')."));
         printf (" %s\n", "-D, --output-delimiter=STRING");