* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
- * Format and print ntp packets.
* By Jeffrey Mogul/DECWRL
* loosely based on print-bootp.c
*/
+/* \summary: Network Time Protocol (NTP) printer */
+
+/*
+ * specification:
+ *
+ * RFC 1119 - NTPv2
+ * RFC 1305 - NTPv3
+ * RFC 5905 - NTPv4
+ */
+
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-#include <tcpdump-stdinc.h>
+#include "netdissect-stdinc.h"
#ifdef HAVE_STRFTIME
#include <time.h>
#endif
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
+static const char tstr[] = " [|ntp]";
+
/*
* Based on ntp.h from the U of MD implementation
* This file is based on Version 2 of the NTP spec (RFC1119).
/*
* Definitions for the masses
*/
-#define JAN_1970 2208988800U /* 1970 - 1900 in seconds */
+#define JAN_1970 INT64_T_CONSTANT(2208988800) /* 1970 - 1900 in seconds */
/*
* Structure definitions for NTP fixed point values
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct l_fixedpt {
- uint32_t int_part;
- uint32_t fraction;
+ nd_uint32_t int_part;
+ nd_uint32_t fraction;
};
struct s_fixedpt {
- uint16_t int_part;
- uint16_t fraction;
+ nd_uint16_t int_part;
+ nd_uint16_t fraction;
};
/* rfc2030
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
-struct ntpdata {
- u_char status; /* status of local clock and leap info */
- u_char stratum; /* Stratum level */
- u_char ppoll; /* poll value */
- int precision:8;
+/* Length of the NTP data message with the mandatory fields ("the header")
+ * and without any optional fields (extension, Key Identifier,
+ * Message Digest).
+ */
+#define NTP_TIMEMSG_MINLEN 48U
+
+struct ntp_time_data {
+ nd_uint8_t status; /* status of local clock and leap info */
+ nd_uint8_t stratum; /* Stratum level */
+ nd_int8_t ppoll; /* poll value */
+ nd_int8_t precision;
struct s_fixedpt root_delay;
struct s_fixedpt root_dispersion;
- uint32_t refid;
+ nd_uint32_t refid;
struct l_fixedpt ref_timestamp;
struct l_fixedpt org_timestamp;
struct l_fixedpt rec_timestamp;
struct l_fixedpt xmt_timestamp;
- uint32_t key_id;
- uint8_t message_digest[16];
+ nd_uint32_t key_id;
+ nd_uint8_t message_digest[20];
};
/*
* Leap Second Codes (high order two bits)
*/
#define NTPVERSION_1 0x08
#define VERSIONMASK 0x38
+#define VERSIONSHIFT 3
#define LEAPMASK 0xc0
+#define LEAPSHIFT 6
#ifdef MODEMASK
#undef MODEMASK /* Solaris sucks */
#endif
#define MODEMASK 0x07
+#define MODESHIFT 0
/*
* Code values
#define MODE_CLIENT 3 /* client */
#define MODE_SERVER 4 /* server */
#define MODE_BROADCAST 5 /* broadcast */
-#define MODE_RES1 6 /* reserved */
+#define MODE_CONTROL 6 /* control message */
#define MODE_RES2 7 /* reserved */
/*
static void p_sfix(netdissect_options *ndo, const struct s_fixedpt *);
static void p_ntp_time(netdissect_options *, const struct l_fixedpt *);
static void p_ntp_delta(netdissect_options *, const struct l_fixedpt *, const struct l_fixedpt *);
+static void p_poll(netdissect_options *, const int);
static const struct tok ntp_mode_values[] = {
{ MODE_UNSPEC, "unspecified" },
{ MODE_CLIENT, "Client" },
{ MODE_SERVER, "Server" },
{ MODE_BROADCAST, "Broadcast" },
- { MODE_RES1, "Reserved" },
+ { MODE_CONTROL, "Control Message" },
{ MODE_RES2, "Reserved" },
{ 0, NULL }
};
{ 0, NULL }
};
-/*
- * Print ntp requests
+/* draft-ietf-ntp-mode-6-cmds-02
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |LI | VN |Mode |R|E|M| OpCode | Sequence Number |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Status | Association ID |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Offset | Count |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * / Data (up to 468 bytes) /
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Padding (optional) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * / Authenticator (optional, 96 bytes) /
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Figure 1: NTP Control Message Header
*/
-void
-ntp_print(netdissect_options *ndo,
- register const u_char *cp, u_int length)
-{
- register const struct ntpdata *bp;
- int mode, version, leapind;
-
- bp = (const struct ntpdata *)cp;
-
- ND_TCHECK(bp->status);
- version = (int)(bp->status & VERSIONMASK) >> 3;
- ND_PRINT((ndo, "NTPv%d", version));
-
- mode = bp->status & MODEMASK;
- if (!ndo->ndo_vflag) {
- ND_PRINT((ndo, ", %s, length %u",
- tok2str(ntp_mode_values, "Unknown mode", mode),
- length));
- return;
- }
+/* Length of the NTP control message with the mandatory fields ("the header")
+ * and without any optional fields (Data, Padding, Authenticator).
+ */
+#define NTP_CTRLMSG_MINLEN 12U
+
+struct ntp_control_data {
+ nd_uint8_t magic; /* LI, VN, Mode */
+ nd_uint8_t control; /* R, E, M, OpCode */
+ nd_uint16_t sequence; /* Sequence Number */
+ nd_uint16_t status; /* Status */
+ nd_uint16_t assoc; /* Association ID */
+ nd_uint16_t offset; /* Offset */
+ nd_uint16_t count; /* Count */
+ nd_uint8_t data[564]; /* Data, [Padding, [Authenticator]] */
+};
- ND_PRINT((ndo, ", length %u\n\t%s",
- length,
- tok2str(ntp_mode_values, "Unknown mode", mode)));
+/*
+ * Print NTP time requests and responses
+ */
+static void
+ntp_time_print(netdissect_options *ndo,
+ const struct ntp_time_data *bp, u_int length)
+{
+ uint8_t stratum;
- leapind = bp->status & LEAPMASK;
- ND_PRINT((ndo, ", Leap indicator: %s (%u)",
- tok2str(ntp_leapind_values, "Unknown", leapind),
- leapind));
+ if (length < NTP_TIMEMSG_MINLEN)
+ goto invalid;
- ND_TCHECK(bp->stratum);
- ND_PRINT((ndo, ", Stratum %u (%s)",
- bp->stratum,
- tok2str(ntp_stratum_values, (bp->stratum >=2 && bp->stratum<=15) ? "secondary reference" : "reserved", bp->stratum)));
+ ND_TCHECK_1(bp->stratum);
+ stratum = EXTRACT_U_1(bp->stratum);
+ ND_PRINT(", Stratum %u (%s)",
+ stratum,
+ tok2str(ntp_stratum_values, (stratum >=2 && stratum<=15) ? "secondary reference" : "reserved", stratum));
- ND_TCHECK(bp->ppoll);
- ND_PRINT((ndo, ", poll %u (%us)", bp->ppoll, 1 << bp->ppoll));
+ ND_TCHECK_1(bp->ppoll);
+ ND_PRINT(", poll %d", EXTRACT_S_1(bp->ppoll));
+ p_poll(ndo, EXTRACT_U_1(bp->ppoll));
- /* Can't ND_TCHECK bp->precision bitfield so bp->distance + 0 instead */
- ND_TCHECK2(bp->root_delay, 0);
- ND_PRINT((ndo, ", precision %d", bp->precision));
+ ND_TCHECK_1(bp->precision);
+ ND_PRINT(", precision %d", EXTRACT_S_1(bp->precision));
- ND_TCHECK(bp->root_delay);
- ND_PRINT((ndo, "\n\tRoot Delay: "));
+ ND_TCHECK_SIZE(&bp->root_delay);
+ ND_PRINT("\n\tRoot Delay: ");
p_sfix(ndo, &bp->root_delay);
- ND_TCHECK(bp->root_dispersion);
- ND_PRINT((ndo, ", Root dispersion: "));
+ ND_TCHECK_SIZE(&bp->root_dispersion);
+ ND_PRINT(", Root dispersion: ");
p_sfix(ndo, &bp->root_dispersion);
- ND_TCHECK(bp->refid);
- ND_PRINT((ndo, ", Reference-ID: "));
+ ND_TCHECK_4(bp->refid);
+ ND_PRINT(", Reference-ID: ");
/* Interpretation depends on stratum */
- switch (bp->stratum) {
+ switch (stratum) {
case UNSPECIFIED:
- ND_PRINT((ndo, "(unspec)"));
+ ND_PRINT("(unspec)");
break;
case PRIM_REF:
break;
case INFO_QUERY:
- ND_PRINT((ndo, "%s INFO_QUERY", ipaddr_string(ndo, &(bp->refid))));
+ ND_PRINT("%s INFO_QUERY", ipaddr_string(ndo, bp->refid));
/* this doesn't have more content */
return;
case INFO_REPLY:
- ND_PRINT((ndo, "%s INFO_REPLY", ipaddr_string(ndo, &(bp->refid))));
+ ND_PRINT("%s INFO_REPLY", ipaddr_string(ndo, bp->refid));
/* this is too complex to be worth printing */
return;
default:
- ND_PRINT((ndo, "%s", ipaddr_string(ndo, &(bp->refid))));
+ /* In NTPv4 (RFC 5905) refid is an IPv4 address or first 32 bits of
+ MD5 sum of IPv6 address */
+ ND_PRINT("0x%08x", EXTRACT_BE_U_4(bp->refid));
break;
}
- ND_TCHECK(bp->ref_timestamp);
- ND_PRINT((ndo, "\n\t Reference Timestamp: "));
+ ND_TCHECK_SIZE(&bp->ref_timestamp);
+ ND_PRINT("\n\t Reference Timestamp: ");
p_ntp_time(ndo, &(bp->ref_timestamp));
- ND_TCHECK(bp->org_timestamp);
- ND_PRINT((ndo, "\n\t Originator Timestamp: "));
+ ND_TCHECK_SIZE(&bp->org_timestamp);
+ ND_PRINT("\n\t Originator Timestamp: ");
p_ntp_time(ndo, &(bp->org_timestamp));
- ND_TCHECK(bp->rec_timestamp);
- ND_PRINT((ndo, "\n\t Receive Timestamp: "));
+ ND_TCHECK_SIZE(&bp->rec_timestamp);
+ ND_PRINT("\n\t Receive Timestamp: ");
p_ntp_time(ndo, &(bp->rec_timestamp));
- ND_TCHECK(bp->xmt_timestamp);
- ND_PRINT((ndo, "\n\t Transmit Timestamp: "));
+ ND_TCHECK_SIZE(&bp->xmt_timestamp);
+ ND_PRINT("\n\t Transmit Timestamp: ");
p_ntp_time(ndo, &(bp->xmt_timestamp));
- ND_PRINT((ndo, "\n\t Originator - Receive Timestamp: "));
+ ND_PRINT("\n\t Originator - Receive Timestamp: ");
p_ntp_delta(ndo, &(bp->org_timestamp), &(bp->rec_timestamp));
- ND_PRINT((ndo, "\n\t Originator - Transmit Timestamp: "));
+ ND_PRINT("\n\t Originator - Transmit Timestamp: ");
p_ntp_delta(ndo, &(bp->org_timestamp), &(bp->xmt_timestamp));
- if ( (sizeof(struct ntpdata) - length) == 16) { /* Optional: key-id */
- ND_TCHECK(bp->key_id);
- ND_PRINT((ndo, "\n\tKey id: %u", bp->key_id));
- } else if ( (sizeof(struct ntpdata) - length) == 0) { /* Optional: key-id + authentication */
- ND_TCHECK(bp->key_id);
- ND_PRINT((ndo, "\n\tKey id: %u", bp->key_id));
- ND_TCHECK2(bp->message_digest, sizeof (bp->message_digest));
- ND_PRINT((ndo, "\n\tAuthentication: %08x%08x%08x%08x",
- EXTRACT_32BITS(bp->message_digest),
- EXTRACT_32BITS(bp->message_digest + 4),
- EXTRACT_32BITS(bp->message_digest + 8),
- EXTRACT_32BITS(bp->message_digest + 12)));
- }
+ /* FIXME: this code is not aware of any extension fields */
+ if (length == NTP_TIMEMSG_MINLEN + 4) { /* Optional: key-id (crypto-NAK) */
+ ND_TCHECK_4(bp->key_id);
+ ND_PRINT("\n\tKey id: %u", EXTRACT_BE_U_4(bp->key_id));
+ } else if (length == NTP_TIMEMSG_MINLEN + 4 + 16) { /* Optional: key-id + 128-bit digest */
+ ND_TCHECK_4(bp->key_id);
+ ND_PRINT("\n\tKey id: %u", EXTRACT_BE_U_4(bp->key_id));
+ ND_TCHECK_LEN(bp->message_digest, 16);
+ ND_PRINT("\n\tAuthentication: %08x%08x%08x%08x",
+ EXTRACT_BE_U_4(bp->message_digest),
+ EXTRACT_BE_U_4(bp->message_digest + 4),
+ EXTRACT_BE_U_4(bp->message_digest + 8),
+ EXTRACT_BE_U_4(bp->message_digest + 12));
+ } else if (length == NTP_TIMEMSG_MINLEN + 4 + 20) { /* Optional: key-id + 160-bit digest */
+ ND_TCHECK_4(bp->key_id);
+ ND_PRINT("\n\tKey id: %u", EXTRACT_BE_U_4(bp->key_id));
+ ND_TCHECK_LEN(bp->message_digest, 20);
+ ND_PRINT("\n\tAuthentication: %08x%08x%08x%08x%08x",
+ EXTRACT_BE_U_4(bp->message_digest),
+ EXTRACT_BE_U_4(bp->message_digest + 4),
+ EXTRACT_BE_U_4(bp->message_digest + 8),
+ EXTRACT_BE_U_4(bp->message_digest + 12),
+ EXTRACT_BE_U_4(bp->message_digest + 16));
+ } else if (length > NTP_TIMEMSG_MINLEN) {
+ ND_PRINT("\n\t(%u more bytes after the header)", length - NTP_TIMEMSG_MINLEN);
+ }
+ return;
+
+invalid:
+ ND_PRINT(" %s", istr);
+ ND_TCHECK_LEN(bp, length);
+ return;
+
+trunc:
+ ND_PRINT(" %s", tstr);
+}
+
+/*
+ * Print NTP control message requests and responses
+ */
+static void
+ntp_control_print(netdissect_options *ndo,
+ const struct ntp_control_data *cd, u_int length)
+{
+ uint8_t control, R, E, M, opcode;
+ uint16_t sequence, status, assoc, offset, count;
+
+ if (length < NTP_CTRLMSG_MINLEN)
+ goto invalid;
+
+ ND_TCHECK_1(cd->control);
+ control = EXTRACT_U_1(cd->control);
+ R = (control & 0x80) != 0;
+ E = (control & 0x40) != 0;
+ M = (control & 0x20) != 0;
+ opcode = control & 0x1f;
+ ND_PRINT(", %s, %s, %s, OpCode=%u\n",
+ R ? "Response" : "Request", E ? "Error" : "OK",
+ M ? "More" : "Last", opcode);
+
+ ND_TCHECK_2(cd->sequence);
+ sequence = EXTRACT_BE_U_2(cd->sequence);
+ ND_PRINT("\tSequence=%hu", sequence);
+
+ ND_TCHECK_2(cd->status);
+ status = EXTRACT_BE_U_2(cd->status);
+ ND_PRINT(", Status=%#hx", status);
+
+ ND_TCHECK_2(cd->assoc);
+ assoc = EXTRACT_BE_U_2(cd->assoc);
+ ND_PRINT(", Assoc.=%hu", assoc);
+
+ ND_TCHECK_2(cd->offset);
+ offset = EXTRACT_BE_U_2(cd->offset);
+ ND_PRINT(", Offset=%hu", offset);
+
+ ND_TCHECK_2(cd->count);
+ count = EXTRACT_BE_U_2(cd->count);
+ ND_PRINT(", Count=%hu", count);
+
+ if (NTP_CTRLMSG_MINLEN + count > length)
+ goto invalid;
+ if (count != 0) {
+ ND_TCHECK_LEN(cd->data, count);
+ ND_PRINT("\n\tTO-BE-DONE: data not interpreted");
+ }
+ return;
+
+invalid:
+ ND_PRINT(" %s", istr);
+ ND_TCHECK_LEN(cd, length);
return;
trunc:
- ND_PRINT((ndo, " [|ntp]"));
+ ND_PRINT(" %s", tstr);
+}
+
+union ntpdata {
+ struct ntp_time_data td;
+ struct ntp_control_data cd;
+};
+
+/*
+ * Print NTP requests, handling the common VN, LI, and Mode
+ */
+void
+ntp_print(netdissect_options *ndo,
+ const u_char *cp, u_int length)
+{
+ const union ntpdata *bp = (const union ntpdata *)cp;
+ u_int mode, version, leapind;
+ uint8_t status;
+
+ ND_TCHECK_1(bp->td.status);
+ status = EXTRACT_U_1(bp->td.status);
+
+ version = (status & VERSIONMASK) >> VERSIONSHIFT;
+ ND_PRINT("NTPv%u", version);
+
+ mode = (status & MODEMASK) >> MODESHIFT;
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", %s, length %u",
+ tok2str(ntp_mode_values, "Unknown mode", mode),
+ length);
+ return;
+ }
+
+ ND_PRINT(", %s, length %u\n",
+ tok2str(ntp_mode_values, "Unknown mode", mode), length);
+
+ /* leapind = (status & LEAPMASK) >> LEAPSHIFT; */
+ leapind = (status & LEAPMASK);
+ ND_PRINT("\tLeap indicator: %s (%u)",
+ tok2str(ntp_leapind_values, "Unknown", leapind),
+ leapind);
+
+ switch (mode) {
+
+ case MODE_UNSPEC:
+ case MODE_SYM_ACT:
+ case MODE_SYM_PAS:
+ case MODE_CLIENT:
+ case MODE_SERVER:
+ case MODE_BROADCAST:
+ ntp_time_print(ndo, &bp->td, length);
+ break;
+
+ case MODE_CONTROL:
+ ntp_control_print(ndo, &bp->cd, length);
+ break;
+
+ default:
+ break; /* XXX: not implemented! */
+ }
+ return;
+
+trunc:
+ ND_PRINT(" %s", tstr);
}
static void
p_sfix(netdissect_options *ndo,
- register const struct s_fixedpt *sfp)
+ const struct s_fixedpt *sfp)
{
- register int i;
- register int f;
- register float ff;
-
- 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 */
- ND_PRINT((ndo, "%d.%06d", i, f));
+ int i;
+ int f;
+ double ff;
+
+ i = EXTRACT_BE_U_2(sfp->int_part);
+ f = EXTRACT_BE_U_2(sfp->fraction);
+ ff = f / 65536.0; /* shift radix point by 16 bits */
+ f = (int)(ff * 1000000.0); /* Treat fraction as parts per million */
+ ND_PRINT("%d.%06d", i, f);
}
#define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */
static void
p_ntp_time(netdissect_options *ndo,
- register const struct l_fixedpt *lfp)
+ const struct l_fixedpt *lfp)
{
- register int32_t i;
- register uint32_t uf;
- register uint32_t f;
- register float ff;
+ uint32_t i;
+ uint32_t uf;
+ uint32_t f;
+ double ff;
- i = EXTRACT_32BITS(&lfp->int_part);
- uf = EXTRACT_32BITS(&lfp->fraction);
+ i = EXTRACT_BE_U_4(lfp->int_part);
+ uf = EXTRACT_BE_U_4(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 */
- ND_PRINT((ndo, "%u.%09d", i, f));
+ ff = ff / FMAXINT; /* shift radix point by 32 bits */
+ f = (uint32_t)(ff * 1000000000.0); /* treat fraction as parts per billion */
+ ND_PRINT("%u.%09u", i, f);
#ifdef HAVE_STRFTIME
/*
- * print the time in human-readable format.
+ * print the UTC time in human-readable format.
*/
if (i) {
- time_t seconds = i - JAN_1970;
+ int64_t seconds_64bit = (int64_t)i - JAN_1970;
+ time_t seconds;
struct tm *tm;
char time_buf[128];
- tm = localtime(&seconds);
- strftime(time_buf, sizeof (time_buf), "%Y/%m/%d %H:%M:%S", tm);
- ND_PRINT((ndo, " (%s)", time_buf));
+ seconds = (time_t)seconds_64bit;
+ if (seconds != seconds_64bit) {
+ /*
+ * It doesn't fit into a time_t, so we can't hand it
+ * to gmtime.
+ */
+ ND_PRINT(" (unrepresentable)");
+ } else {
+ tm = gmtime(&seconds);
+ if (tm == NULL) {
+ /*
+ * gmtime() can't handle it.
+ * (Yes, that might happen with some version of
+ * Microsoft's C library.)
+ */
+ ND_PRINT(" (unrepresentable)");
+ } else {
+ /* use ISO 8601 (RFC3339) format */
+ strftime(time_buf, sizeof (time_buf), "%Y-%m-%dT%H:%M:%S", tm);
+ ND_PRINT(" (%s)", time_buf);
+ }
+ }
}
#endif
}
/* Prints time difference between *lfp and *olfp */
static void
p_ntp_delta(netdissect_options *ndo,
- register const struct l_fixedpt *olfp,
- register const struct l_fixedpt *lfp)
+ const struct l_fixedpt *olfp,
+ const struct l_fixedpt *lfp)
{
- register int32_t i;
- register uint32_t u, uf;
- register uint32_t ou, ouf;
- register uint32_t f;
- register float ff;
+ uint32_t u, uf;
+ uint32_t ou, ouf;
+ uint32_t i;
+ uint32_t f;
+ double ff;
int signbit;
- u = EXTRACT_32BITS(&lfp->int_part);
- ou = EXTRACT_32BITS(&olfp->int_part);
- uf = EXTRACT_32BITS(&lfp->fraction);
- ouf = EXTRACT_32BITS(&olfp->fraction);
+ u = EXTRACT_BE_U_4(lfp->int_part);
+ ou = EXTRACT_BE_U_4(olfp->int_part);
+ uf = EXTRACT_BE_U_4(lfp->fraction);
+ ouf = EXTRACT_BE_U_4(olfp->fraction);
if (ou == 0 && ouf == 0) {
p_ntp_time(ndo, lfp);
return;
}
- i = u - ou;
-
- if (i > 0) { /* new is definitely greater than old */
+ if (u > ou) { /* new is definitely greater than old */
signbit = 0;
+ i = u - ou;
f = uf - ouf;
if (ouf > uf) /* must borrow from high-order bits */
i -= 1;
- } else if (i < 0) { /* new is definitely less than old */
+ } else if (u < ou) { /* new is definitely less than old */
signbit = 1;
+ i = ou - u;
f = ouf - uf;
- if (uf > ouf) /* must carry into the high-order bits */
- i += 1;
- i = -i;
+ if (uf > ouf) /* must borrow from the high-order bits */
+ i -= 1;
} else { /* int_part is zero */
+ i = 0;
if (uf > ouf) {
signbit = 0;
f = uf - ouf;
ff = f;
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 */
- ND_PRINT((ndo, "%s%d.%09d", signbit ? "-" : "+", i, f));
+ ff = ff / FMAXINT; /* shift radix point by 32 bits */
+ f = (uint32_t)(ff * 1000000000.0); /* treat fraction as parts per billion */
+ ND_PRINT("%s%u.%09u", signbit ? "-" : "+", i, f);
+}
+
+/* Prints polling interval in log2 as seconds or fraction of second */
+static void
+p_poll(netdissect_options *ndo,
+ const int poll_interval)
+{
+ if (poll_interval <= -32 || poll_interval >= 32)
+ return;
+
+ if (poll_interval >= 0)
+ ND_PRINT(" (%us)", 1U << poll_interval);
+ else
+ ND_PRINT(" (1/%us)", 1U << -poll_interval);
}
projects / tcpdump / blobdiff