|
|
@@ -73,13 +73,31 @@ typedef struct {
|
|
|
uint8_t stratum; /* clock stratum */
|
|
|
int8_t poll; /* polling interval */
|
|
|
int8_t precision; /* precision of the local clock */
|
|
|
- int32_t rtdelay; /* total rt delay, as a fixed point num. see macros */
|
|
|
- uint32_t rtdisp; /* like above, but for max err to primary src */
|
|
|
+ union {
|
|
|
+ int32_t rtdelay; /* total rt delay, as a fixed point num. see macros */
|
|
|
+ struct {
|
|
|
+ uint16_t rtdelay_l16;
|
|
|
+ uint16_t rtdelay_r16;
|
|
|
+ };
|
|
|
+ };
|
|
|
+ union {
|
|
|
+ uint32_t rtdisp; /* like above, but for max err to primary src */
|
|
|
+ struct {
|
|
|
+ uint16_t rtdisp_l16;
|
|
|
+ uint16_t rtdisp_r16;
|
|
|
+ };
|
|
|
+ };
|
|
|
uint32_t refid; /* ref clock identifier */
|
|
|
uint64_t refts; /* reference timestamp. local time local clock */
|
|
|
uint64_t origts; /* time at which request departed client */
|
|
|
uint64_t rxts; /* time at which request arrived at server */
|
|
|
- uint64_t txts; /* time at which request departed server */
|
|
|
+ union {
|
|
|
+ uint64_t txts; /* time at which request departed server */
|
|
|
+ struct {
|
|
|
+ uint32_t txts_l32;
|
|
|
+ uint32_t txts_r32;
|
|
|
+ };
|
|
|
+ };
|
|
|
} ntp_message;
|
|
|
|
|
|
/* this structure holds data about results from querying offset from a peer */
|
|
|
@@ -155,35 +173,68 @@ ntp_server_results *servers=NULL;
|
|
|
/* ntp wants seconds since 1/1/00, epoch is 1/1/70. this is the difference */
|
|
|
#define EPOCHDIFF 0x83aa7e80UL
|
|
|
|
|
|
+/* extract double from 32-bit ntp fixed point number, without violating strict aliasing rules */
|
|
|
+double ntp32_to_double(uint32_t n) {
|
|
|
+ double result = 0;
|
|
|
+ if (n) {
|
|
|
+ uint16_t l16 = ntohs((uint16_t) (n & ((1<<16) - 1)));
|
|
|
+ uint16_t r16 = ntohs((uint16_t) (n >> 16));
|
|
|
+ result = l16 + ((double) r16/65536.0);
|
|
|
+ }
|
|
|
+ return result;
|
|
|
+}
|
|
|
/* extract a 32-bit ntp fixed point number into a double */
|
|
|
-#define NTP32asDOUBLE(x) (ntohs(L16(x)) + (double)ntohs(R16(x))/65536.0)
|
|
|
+/* #define NTP32asDOUBLE(x) (ntohs(L16(x)) + (double)ntohs(R16(x))/65536.0)*/
|
|
|
+
|
|
|
+/* extract double from 64-bit ntp fixed point number, without violating strict aliasing rules */
|
|
|
+double ntp64_to_double(uint64_t n) {
|
|
|
+ double result = 0;
|
|
|
+ if (n) {
|
|
|
+ uint32_t l32 = ntohl((uint32_t) (n & ((1ul<<32) - 1)));
|
|
|
+ uint32_t r32 = ntohl((uint32_t) (n >> 32));
|
|
|
+ result = (l32 - EPOCHDIFF)
|
|
|
+ + (.00000001*(0.5+(double)(r32/42.94967296)));
|
|
|
+ }
|
|
|
+ return result;
|
|
|
+}
|
|
|
|
|
|
/* likewise for a 64-bit ntp fp number */
|
|
|
-#define NTP64asDOUBLE(n) (double)(((uint64_t)n)?\
|
|
|
- (ntohl(L32(n))-EPOCHDIFF) + \
|
|
|
- (.00000001*(0.5+(double)(ntohl(R32(n))/42.94967296))):\
|
|
|
- 0)
|
|
|
+/* #define NTP64asDOUBLE(n) (double)(((uint64_t)n)?\
|
|
|
+ (ntohl(L32(n))-EPOCHDIFF) + \
|
|
|
+ (.00000001*(0.5+(double)(ntohl(R32(n))/42.94967296))):\
|
|
|
+ 0)*/
|
|
|
|
|
|
/* convert a struct timeval to a double */
|
|
|
#define TVasDOUBLE(x) (double)(x.tv_sec+(0.000001*x.tv_usec))
|
|
|
|
|
|
+struct timeval ntp64_to_tv(uint64_t n) {
|
|
|
+ struct timeval result = {};
|
|
|
+ if (n) {
|
|
|
+ uint32_t l32 = ntohl((uint32_t) (n & ((1ul<<32) - 1)));
|
|
|
+ uint32_t r32 = ntohl((uint32_t) (n >> 32));
|
|
|
+ result.tv_sec = l32 - EPOCHDIFF;
|
|
|
+ result.tv_usec = (int)(0.5+(double)(r32/4294.967296));
|
|
|
+ }
|
|
|
+ return result;
|
|
|
+}
|
|
|
+
|
|
|
/* convert an ntp 64-bit fp number to a struct timeval */
|
|
|
-#define NTP64toTV(n,t) \
|
|
|
+/* #define NTP64toTV(n,t) \
|
|
|
do{ if(!n) t.tv_sec = t.tv_usec = 0; \
|
|
|
else { \
|
|
|
t.tv_sec=ntohl(L32(n))-EPOCHDIFF; \
|
|
|
t.tv_usec=(int)(0.5+(double)(ntohl(R32(n))/4294.967296)); \
|
|
|
} \
|
|
|
- }while(0)
|
|
|
+ }while(0) */
|
|
|
|
|
|
/* convert a struct timeval to an ntp 64-bit fp number */
|
|
|
-#define TVtoNTP64(t,n) \
|
|
|
+/* #define TVtoNTP64(t,n) \
|
|
|
do{ if(!t.tv_usec && !t.tv_sec) n=0x0UL; \
|
|
|
else { \
|
|
|
L32(n)=htonl(t.tv_sec + EPOCHDIFF); \
|
|
|
R32(n)=htonl((uint64_t)((4294.967296*t.tv_usec)+.5)); \
|
|
|
} \
|
|
|
- } while(0)
|
|
|
+ } while(0) */
|
|
|
|
|
|
/* NTP control message header is 12 bytes, plus any data in the data
|
|
|
* field, plus null padding to the nearest 32-bit boundary per rfc.
|
|
|
@@ -200,9 +251,9 @@ ntp_server_results *servers=NULL;
|
|
|
/* calculate the offset of the local clock */
|
|
|
static inline double calc_offset(const ntp_message *m, const struct timeval *t){
|
|
|
double client_tx, peer_rx, peer_tx, client_rx;
|
|
|
- client_tx = NTP64asDOUBLE(m->origts);
|
|
|
- peer_rx = NTP64asDOUBLE(m->rxts);
|
|
|
- peer_tx = NTP64asDOUBLE(m->txts);
|
|
|
+ client_tx = ntp64_to_double(m->origts);
|
|
|
+ peer_rx = ntp64_to_double(m->rxts);
|
|
|
+ peer_tx = ntp64_to_double(m->txts);
|
|
|
client_rx=TVasDOUBLE((*t));
|
|
|
return (.5*((peer_tx-client_rx)+(peer_rx-client_tx)));
|
|
|
}
|
|
|
@@ -211,10 +262,10 @@ static inline double calc_offset(const ntp_message *m, const struct timeval *t){
|
|
|
void print_ntp_message(const ntp_message *p){
|
|
|
struct timeval ref, orig, rx, tx;
|
|
|
|
|
|
- NTP64toTV(p->refts,ref);
|
|
|
- NTP64toTV(p->origts,orig);
|
|
|
- NTP64toTV(p->rxts,rx);
|
|
|
- NTP64toTV(p->txts,tx);
|
|
|
+ ref = ntp64_to_tv(p->refts);
|
|
|
+ orig = ntp64_to_tv(p->origts);
|
|
|
+ rx = ntp64_to_tv(p->rxts);
|
|
|
+ tx = ntp64_to_tv(p->txts);
|
|
|
|
|
|
printf("packet contents:\n");
|
|
|
printf("\tflags: 0x%.2x\n", p->flags);
|
|
|
@@ -224,13 +275,13 @@ void print_ntp_message(const ntp_message *p){
|
|
|
printf("\tstratum = %d\n", p->stratum);
|
|
|
printf("\tpoll = %g\n", pow(2, p->poll));
|
|
|
printf("\tprecision = %g\n", pow(2, p->precision));
|
|
|
- printf("\trtdelay = %-.16g\n", NTP32asDOUBLE(p->rtdelay));
|
|
|
- printf("\trtdisp = %-.16g\n", NTP32asDOUBLE(p->rtdisp));
|
|
|
+ printf("\trtdelay = %-.16g\n", ntp32_to_double(p->rtdelay));
|
|
|
+ printf("\trtdisp = %-.16g\n", ntp32_to_double(p->rtdisp));
|
|
|
printf("\trefid = %x\n", p->refid);
|
|
|
- printf("\trefts = %-.16g\n", NTP64asDOUBLE(p->refts));
|
|
|
- printf("\torigts = %-.16g\n", NTP64asDOUBLE(p->origts));
|
|
|
- printf("\trxts = %-.16g\n", NTP64asDOUBLE(p->rxts));
|
|
|
- printf("\ttxts = %-.16g\n", NTP64asDOUBLE(p->txts));
|
|
|
+ printf("\trefts = %-.16g\n", ntp64_to_double(p->refts));
|
|
|
+ printf("\torigts = %-.16g\n", ntp64_to_double(p->origts));
|
|
|
+ printf("\trxts = %-.16g\n", ntp64_to_double(p->rxts));
|
|
|
+ printf("\ttxts = %-.16g\n", ntp64_to_double(p->txts));
|
|
|
}
|
|
|
|
|
|
void setup_request(ntp_message *p){
|
|
|
@@ -242,11 +293,17 @@ void setup_request(ntp_message *p){
|
|
|
MODE_SET(p->flags, MODE_CLIENT);
|
|
|
p->poll=4;
|
|
|
p->precision=(int8_t)0xfa;
|
|
|
- L16(p->rtdelay)=htons(1);
|
|
|
- L16(p->rtdisp)=htons(1);
|
|
|
+ p->rtdelay_l16=htons(1);
|
|
|
+ p->rtdisp_l16=htons(1);
|
|
|
|
|
|
gettimeofday(&t, NULL);
|
|
|
- TVtoNTP64(t,p->txts);
|
|
|
+
|
|
|
+ /* This used to use TVtoNTP64 but we ran into issues with strict aliasing/type punning.
|
|
|
+ * We only used the macro in one place, so it's inlined now */
|
|
|
+ if (t.tv_usec || t.tv_sec) {
|
|
|
+ p->txts_l32 = htonl(t.tv_sec + EPOCHDIFF);
|
|
|
+ p->txts_r32 = htonl((uint64_t) ((4294.967296*t.tv_usec)+.5));
|
|
|
+ }
|
|
|
}
|
|
|
|
|
|
/* select the "best" server from a list of servers, and return its index.
|
|
|
@@ -420,8 +477,8 @@ double offset_request(const char *host, int *status){
|
|
|
printf("offset %.10g\n", servers[i].offset[respnum]);
|
|
|
}
|
|
|
servers[i].stratum=req[i].stratum;
|
|
|
- servers[i].rtdisp=NTP32asDOUBLE(req[i].rtdisp);
|
|
|
- servers[i].rtdelay=NTP32asDOUBLE(req[i].rtdelay);
|
|
|
+ servers[i].rtdisp=ntp32_to_double(req[i].rtdisp);
|
|
|
+ servers[i].rtdelay=ntp32_to_double(req[i].rtdelay);
|
|
|
servers[i].waiting--;
|
|
|
servers[i].flags=req[i].flags;
|
|
|
servers_readable--;
|
|
|
@@ -490,7 +547,7 @@ int process_arguments(int argc, char **argv){
|
|
|
usage ("\n");
|
|
|
|
|
|
while (1) {
|
|
|
- c = getopt_long (argc, argv, "Vhv46qw:c:t:H:p:o:d:", longopts, &option);
|
|
|
+ c = getopt_long (argc, argv, "Vhv46qw:c:t:H:p:o:d:C:W:", longopts, &option);
|
|
|
if (c == -1 || c == EOF || c == 1)
|
|
|
break;
|
|
|
|
|
|
@@ -722,6 +779,6 @@ void
|
|
|
print_usage(void)
|
|
|
{
|
|
|
printf ("%s\n", _("Usage:"));
|
|
|
- printf(" %s -H <host> [-4|-6] [-w <warn>] [-c <crit>] [-v verbose] [-o <time offset>] [-d <delay>]\n", progname);
|
|
|
+ printf(" %s -H <host> [-4|-6] [-w <warn>] [-c <crit>] [-v verbose] [-o <time offset>] [-d <delay>] [-W <stratum warn>] [-C <stratum crit>]\n", progname);
|
|
|
}
|
|
|
|
kraken-jim