diff options
| -rw-r--r-- | plugins/check_ntp.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/plugins/check_ntp.c b/plugins/check_ntp.c index 30e58900..18571184 100644 --- a/plugins/check_ntp.c +++ b/plugins/check_ntp.c @@ -507,6 +507,7 @@ double jitter_request(const char *host, int *status){ int peers_size=0, peer_offset=0; ntp_assoc_status_pair *peers=NULL; ntp_control_message req; + const char *getvar = "jitter"; double rval = 0.0, jitter = -1.0; char *startofvalue=NULL, *nptr=NULL; void *tmp; @@ -584,8 +585,10 @@ double jitter_request(const char *host, int *status){ * thus reducing net traffic, guaranteeing us only a single * datagram in reply, and making intepretation much simpler */ - strncpy(req.data, "jitter", 6); - req.count = htons(6); + /* Older servers doesn't know what jitter is, so if we get an + * error on the first pass we redo it with "dispersion" */ + strncpy(req.data, getvar, MAX_CM_SIZE-1); + req.count = htons(strlen(getvar)); DBG(printf("sending READVAR request...\n")); write(conn, &req, SIZEOF_NTPCM(req)); DBG(print_ntp_control_message(&req)); @@ -595,6 +598,14 @@ double jitter_request(const char *host, int *status){ read(conn, &req, SIZEOF_NTPCM(req)); DBG(print_ntp_control_message(&req)); + if(req.op&REM_ERROR && strstr(getvar, "jitter")) { + if(verbose) printf("The 'jitter' command failed (old ntp server?)\nRestarting with 'dispersion'...\n"); + getvar = "dispersion"; + num_selected--; + i--; + continue; + } + /* get to the float value */ if(verbose) { printf("parsing jitter from peer %.2x: ", ntohs(peers[i].assoc)); |