1 files changed, 10 insertions, 3 deletions

diff --git a/plugins/check_ntp_time.c b/plugins/check_ntp_time.c
index 72dffbd..d6cf419 100644
--- a/plugins/check_ntp_time.c
+++ b/plugins/check_ntp_time.c
@@ -48,6 +48,7 @@ static int verbose=0;
 static int quiet=0;
 static char *owarn="60";
 static char *ocrit="120";
+static int time_offset=0;
 
 int process_arguments (int, char **);
 thresholds *offset_thresholds = NULL;
@@ -400,7 +401,7 @@ double offset_request(const char *host, int *status){
                                 gettimeofday(&recv_time, NULL);
                                 DBG(print_ntp_message(&req[i]));
                                 respnum=servers[i].num_responses++;
-                                servers[i].offset[respnum]=calc_offset(&req[i], &recv_time);
+                                servers[i].offset[respnum]=calc_offset(&req[i], &recv_time)+time_offset;
                                 if(verbose) {
                                         printf("offset %.10g\n", servers[i].offset[respnum]);
                                 }
@@ -455,6 +456,7 @@ int process_arguments(int argc, char **argv){
                 {"use-ipv4", no_argument, 0, '4'},
                 {"use-ipv6", no_argument, 0, '6'},
                 {"quiet", no_argument, 0, 'q'},
+                {"time-offset", optional_argument, 0, 'o'},
                 {"warning", required_argument, 0, 'w'},
                 {"critical", required_argument, 0, 'c'},
                 {"timeout", required_argument, 0, 't'},
@@ -468,7 +470,7 @@ int process_arguments(int argc, char **argv){
                 usage ("\n");
 
         while (1) {
-                c = getopt_long (argc, argv, "Vhv46qw:c:t:H:p:", longopts, &option);
+                c = getopt_long (argc, argv, "Vhv46qw:c:t:H:p:o:", longopts, &option);
                 if (c == -1 || c == EOF || c == 1)
                         break;
 
@@ -504,6 +506,9 @@ int process_arguments(int argc, char **argv){
                 case 't':
                         socket_timeout=atoi(optarg);
                         break;
+                case 'o':
+                        time_offset=atoi(optarg);
+                        break;
                 case '4':
                         address_family = AF_INET;
                         break;
@@ -616,6 +621,8 @@ void print_help(void){
         printf ("    %s\n", _("Offset to result in warning status (seconds)"));
         printf (" %s\n", "-c, --critical=THRESHOLD");
         printf ("    %s\n", _("Offset to result in critical status (seconds)"));
+        printf (" %s\n", "-o, --time_offset=");
+        printf ("    %s\n", _("Expected offset of the ntp server relative to local server (seconds)"));
         printf (UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
         printf (UT_VERBOSE);
 
@@ -642,6 +649,6 @@ void
 print_usage(void)
 {
         printf ("%s\n", _("Usage:"));
-        printf(" %s -H <host> [-4|-6] [-w <warn>] [-c <crit>] [-v verbose]\n", progname);
+        printf(" %s -H <host> [-4|-6] [-w <warn>] [-c <crit>] [-v verbose] [-o <time offset>]\n", progname);
 }