Use "len", not "payload_len", as we step through the packet; use

[tcpdump] / print-ntp.c

diff --git a/print-ntp.c b/print-ntp.c
index f8296d7ad8496ffdbab268a860a4a7051ed3ae42..b4ab2ffee51fedc1777dafa8fee510a62c229af5 100644 (file)
--- a/print-ntp.c
+++ b/print-ntp.c
@@ -24,26 +24,25 @@
  */
 
 #ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-ntp.c,v 1.33 2002-04-25 04:57:59 guy Exp $ (LBL)";
+static const char rcsid[] _U_ =
+    "@(#) $Header: /tcpdump/master/tcpdump/print-ntp.c,v 1.39 2003-11-16 09:36:30 guy Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
+#include <tcpdump-stdinc.h>
 
-#include <netinet/in.h>
-
-#include <ctype.h>
 #include <stdio.h>
 #include <string.h>
+#ifdef HAVE_STRFTIME
+#include <time.h>
+#endif
 
 #include "interface.h"
 #include "addrtoname.h"
+#include "extract.h"
 #ifdef MODEMASK
 #undef MODEMASK                                        /* Solaris sucks */
 #endif
@@ -70,7 +69,7 @@ ntp_print(register const u_char *cp, u_int length)
        TCHECK(bp->status);
 
        version = (int)(bp->status & VERSIONMASK) >> 3;
-       printf(" v%d", version);
+       printf("NTPv%d", version);
 
        leapind = bp->status & LEAPMASK;
        switch (leapind) {
@@ -125,14 +124,14 @@ ntp_print(register const u_char *cp, u_int length)
        }
 
        TCHECK(bp->stratum);
-       printf(" strat %d", bp->stratum);
+       printf(", strat %d", bp->stratum);
 
        TCHECK(bp->ppoll);
-       printf(" poll %d", bp->ppoll);
+       printf(", poll %d", bp->ppoll);
 
        /* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */
        TCHECK2(bp->distance, 0);
-       printf(" prec %d", bp->precision);
+       printf(", prec %d", bp->precision);
 
        if (!vflag)
                return;
@@ -142,11 +141,11 @@ ntp_print(register const u_char *cp, u_int length)
        p_sfix(&bp->distance);
 
        TCHECK(bp->dispersion);
-       fputs(" disp ", stdout);
+       fputs(", disp ", stdout);
        p_sfix(&bp->dispersion);
 
        TCHECK(bp->refid);
-       fputs(" ref ", stdout);
+       fputs(", ref ", stdout);
        /* Interpretation depends on stratum */
        switch (bp->stratum) {
 
@@ -202,8 +201,8 @@ p_sfix(register const struct s_fixedpt *sfp)
        register int f;
        register float ff;
 
-       i = ntohs(sfp->int_part);
-       f = ntohs(sfp->fraction);
+       i = EXTRACT_16BITS(&sfp->int_part);
+       f = EXTRACT_16BITS(&sfp->fraction);
        ff = f / 65536.0;       /* shift radix point by 16 bits */
        f = ff * 1000000.0;     /* Treat fraction as parts per million */
        printf("%d.%06d", i, f);
@@ -219,14 +218,29 @@ p_ntp_time(register const struct l_fixedpt *lfp)
        register u_int32_t f;
        register float ff;
 
-       i = ntohl(lfp->int_part);
-       uf = ntohl(lfp->fraction);
+       i = EXTRACT_32BITS(&lfp->int_part);
+       uf = EXTRACT_32BITS(&lfp->fraction);
        ff = uf;
        if (ff < 0.0)           /* some compilers are buggy */
                ff += FMAXINT;
        ff = ff / FMAXINT;      /* shift radix point by 32 bits */
        f = ff * 1000000000.0;  /* treat fraction as parts per billion */
        printf("%u.%09d", i, f);
+
+#ifdef HAVE_STRFTIME
+       /*
+        * For extra verbosity, print the time in human-readable format.
+        */
+       if (vflag > 1 && i) {
+           time_t seconds = i - JAN_1970;
+           struct tm *tm;
+           char time_buf[128];
+
+           tm = localtime(&seconds);
+           strftime(time_buf, sizeof (time_buf), "%Y/%m/%d %H:%M:%S", tm);
+           printf (" (%s)", time_buf);
+       }
+#endif
 }
 
 /* Prints time difference between *lfp and *olfp */
@@ -235,16 +249,22 @@ p_ntp_delta(register const struct l_fixedpt *olfp,
            register const struct l_fixedpt *lfp)
 {
        register int32_t i;
-       register u_int32_t uf;
-       register u_int32_t ouf;
+       register u_int32_t u, uf;
+       register u_int32_t ou, ouf;
        register u_int32_t f;
        register float ff;
        int signbit;
 
-       i = ntohl(lfp->int_part) - ntohl(olfp->int_part);
+       u = EXTRACT_32BITS(&lfp->int_part);
+       ou = EXTRACT_32BITS(&olfp->int_part);
+       uf = EXTRACT_32BITS(&lfp->fraction);
+       ouf = EXTRACT_32BITS(&olfp->fraction);
+       if (ou == 0 && ouf == 0) {
+               p_ntp_time(lfp);
+               return;
+       }
 
-       uf = ntohl(lfp->fraction);
-       ouf = ntohl(olfp->fraction);
+       i = u - ou;
 
        if (i > 0) {            /* new is definitely greater than old */
                signbit = 0;
@@ -278,3 +298,4 @@ p_ntp_delta(register const struct l_fixedpt *olfp,
                putchar('+');
        printf("%d.%09d", i, f);
 }
+