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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;
48static int quiet=0; 48static int quiet=0;
49static char *owarn="60"; 49static char *owarn="60";
50static char *ocrit="120"; 50static char *ocrit="120";
51static int time_offset=0;
51 52
52int process_arguments (int, char **); 53int process_arguments (int, char **);
53thresholds *offset_thresholds = NULL; 54thresholds *offset_thresholds = NULL;
@@ -400,7 +401,7 @@ double offset_request(const char *host, int *status){
400 gettimeofday(&recv_time, NULL); 401 gettimeofday(&recv_time, NULL);
401 DBG(print_ntp_message(&req[i])); 402 DBG(print_ntp_message(&req[i]));
402 respnum=servers[i].num_responses++; 403 respnum=servers[i].num_responses++;
403 servers[i].offset[respnum]=calc_offset(&req[i], &recv_time); 404 servers[i].offset[respnum]=calc_offset(&req[i], &recv_time)+time_offset;
404 if(verbose) { 405 if(verbose) {
405 printf("offset %.10g\n", servers[i].offset[respnum]); 406 printf("offset %.10g\n", servers[i].offset[respnum]);
406 } 407 }
@@ -455,6 +456,7 @@ int process_arguments(int argc, char **argv){
455 {"use-ipv4", no_argument, 0, '4'}, 456 {"use-ipv4", no_argument, 0, '4'},
456 {"use-ipv6", no_argument, 0, '6'}, 457 {"use-ipv6", no_argument, 0, '6'},
457 {"quiet", no_argument, 0, 'q'}, 458 {"quiet", no_argument, 0, 'q'},
459 {"time-offset", optional_argument, 0, 'o'},
458 {"warning", required_argument, 0, 'w'}, 460 {"warning", required_argument, 0, 'w'},
459 {"critical", required_argument, 0, 'c'}, 461 {"critical", required_argument, 0, 'c'},
460 {"timeout", required_argument, 0, 't'}, 462 {"timeout", required_argument, 0, 't'},
@@ -468,7 +470,7 @@ int process_arguments(int argc, char **argv){
468 usage ("\n"); 470 usage ("\n");
469 471
470 while (1) { 472 while (1) {
471 c = getopt_long (argc, argv, "Vhv46qw:c:t:H:p:", longopts, &option); 473 c = getopt_long (argc, argv, "Vhv46qw:c:t:H:p:o:", longopts, &option);
472 if (c == -1 || c == EOF || c == 1) 474 if (c == -1 || c == EOF || c == 1)
473 break; 475 break;
474 476
@@ -504,6 +506,9 @@ int process_arguments(int argc, char **argv){
504 case 't': 506 case 't':
505 socket_timeout=atoi(optarg); 507 socket_timeout=atoi(optarg);
506 break; 508 break;
509 case 'o':
510 time_offset=atoi(optarg);
511 break;
507 case '4': 512 case '4':
508 address_family = AF_INET; 513 address_family = AF_INET;
509 break; 514 break;
@@ -616,6 +621,8 @@ void print_help(void){
616 printf (" %s\n", _("Offset to result in warning status (seconds)")); 621 printf (" %s\n", _("Offset to result in warning status (seconds)"));
617 printf (" %s\n", "-c, --critical=THRESHOLD"); 622 printf (" %s\n", "-c, --critical=THRESHOLD");
618 printf (" %s\n", _("Offset to result in critical status (seconds)")); 623 printf (" %s\n", _("Offset to result in critical status (seconds)"));
624 printf (" %s\n", "-o, --time_offset=");
625 printf (" %s\n", _("Expected offset of the ntp server relative to local server (seconds)"));
619 printf (UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT); 626 printf (UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
620 printf (UT_VERBOSE); 627 printf (UT_VERBOSE);
621 628
@@ -642,6 +649,6 @@ void
642print_usage(void) 649print_usage(void)
643{ 650{
644 printf ("%s\n", _("Usage:")); 651 printf ("%s\n", _("Usage:"));
645 printf(" %s -H <host> [-4|-6] [-w <warn>] [-c <crit>] [-v verbose]\n", progname); 652 printf(" %s -H <host> [-4|-6] [-w <warn>] [-c <crit>] [-v verbose] [-o <time offset>]\n", progname);
646} 653}
647 654