* Routines for NTP packet dissection
* Copyright 1999, Nathan Neulinger <nneul@umr.edu>
*
- * $Id: packet-ntp.c,v 1.1 1999/10/14 05:10:30 guy Exp $
+ * $Id: packet-ntp.c,v 1.2 1999/10/22 06:30:45 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@unicom.net>
#endif
#include <string.h>
+#include <time.h>
+#include <math.h>
#include <glib.h>
#include "packet.h"
+#include "resolv.h"
#include "packet-ntp.h"
+static const value_string li_types[] = {
+ { NTP_LI_NONE, "no warning" },
+ { NTP_LI_61, "last minute has 61 seconds" },
+ { NTP_LI_59, "last minute has 59 seconds" },
+ { NTP_LI_ALARM, "alarm condition (clock not synchronized)" },
+ { 0, NULL}
+};
+
+static const value_string ver_nums[] = {
+ { NTP_VN_R0, "reserved" },
+ { NTP_VN_R1, "reserved" },
+ { NTP_VN_R2, "reserved" },
+ { NTP_VN_3, "NTP Version 3" },
+ { NTP_VN_4, "NTP Version 4" },
+ { NTP_VN_R5, "reserved" },
+ { NTP_VN_R6, "reserved" },
+ { NTP_VN_R7, "reserved" },
+ { 0, NULL}
+};
+
+static const value_string mode_types[] = {
+ { NTP_MODE_RSV, "reserved" },
+ { NTP_MODE_SYMACT, "symmetric active" },
+ { NTP_MODE_SYMPAS, "symmetric passive" },
+ { NTP_MODE_CLIENT, "client" },
+ { NTP_MODE_SERVER, "server" },
+ { NTP_MODE_BCAST, "broadcast" },
+ { NTP_MODE_CTRL, "reserved for NTP control message"},
+ { NTP_MODE_PRIV, "reserved for private use" },
+ { 0, NULL}
+};
+
+static const struct {
+ char *id;
+ char *data;
+} primary_sources[] = {
+ { "LOCL", "uncalibrated local clock" },
+ { "PPS\0", "atomic clock or other pulse-per-second source" },
+ { "ACTS", "NIST dialup modem service" },
+ { "USNO", "USNO modem service" },
+ { "PTB\0", "PTB (Germany) modem service" },
+ { "TDF\0", "Allouis (France) Radio 164 kHz" },
+ { "DCF\0", "Mainflingen (Germany) Radio 77.5 kHz" },
+ { "MSF\0", "Rugby (UK) Radio 60 kHz" },
+ { "WWV\0", "Ft. Collins (US) Radio 2.5, 5, 10, 15, 20 MHz" },
+ { "WWVB", "Boulder (US) Radio 60 kHz" },
+ { "WWVH", "Kaui Hawaii (US) Radio 2.5, 5, 10, 15 MHz" },
+ { "CHU\0", "Ottawa (Canada) Radio 3330, 7335, 14670 kHz" },
+ { "LORC", "LORAN-C radionavigation system" },
+ { "OMEG", "OMEGA radionavigation system" },
+ { "GPS\0", "Global Positioning Service" },
+ { "GOES", "Geostationary Orbit Environment Satellite" },
+ { "DCN\0", "DCN routing protocol" },
+ { "NIST", "NIST public modem" },
+ { "TSP\0", "TSP time protocol" },
+ { "DTS\0", "Digital Time Service" },
+ { "ATOM", "Atomic clock (calibrated)" },
+ { "VLF\0", "VLF radio (OMEGA,, etc.)" },
+ { NULL, NULL}
+};
+
static int proto_ntp = -1;
static int hf_ntp_flags = -1;
+static int hf_ntp_flags_li = -1;
+static int hf_ntp_flags_vn = -1;
+static int hf_ntp_flags_mode = -1;
static int hf_ntp_stratum = -1;
static int hf_ntp_ppoll = -1;
static int hf_ntp_precision = -1;
static int hf_ntp_keyid = -1;
static int hf_ntp_mac = -1;
+char *
+ntp_fmt_ts(guint32 tsdata[2], char* buff)
+{
+ guint32 tempstmp, tempfrac;
+ time_t temptime;
+ struct tm *bd;
+ double fractime;
+
+ tempstmp = ntohl(tsdata[0]);
+ tempfrac = ntohl(tsdata[1]);
+ if ((tempstmp == 0) && (tempfrac == 0)) {
+ strcpy (buff, "NULL");
+ return buff;
+ } else {
+ temptime = tempstmp - (guint32) NTP_BASETIME;
+ bd = gmtime(&temptime);
+ fractime = bd->tm_sec + tempfrac / 4294967296.0;
+ snprintf(buff, NTP_TS_SIZE, "%04d-%02d-%02d %02d:%02d:%07.4f UTC",
+ bd->tm_year + 1900, bd->tm_mon, bd->tm_mday, bd->tm_hour,
+ bd->tm_min, fractime);
+ }
+ return buff;
+}
+
+
void
dissect_ntp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
{
- proto_tree *ntp_tree, *ti;
+ proto_tree *ntp_tree, *flags_tree;
+ proto_item *ti, *tf;
struct ntp_packet *pkt;
+ gchar buff[NTP_TS_SIZE];
+ int i;
/* get at least a full packet structure */
if ( !BYTES_ARE_IN_FRAME(offset, 48) ) /* 48 without keyid or mac */
if (tree) {
ti = proto_tree_add_item(tree, proto_ntp, offset, END_OF_FRAME, NULL);
ntp_tree = proto_item_add_subtree(ti, ETT_NTP);
+ tf = proto_tree_add_item(ntp_tree, hf_ntp_flags, offset, 1, pkt->flags);
- proto_tree_add_item(ntp_tree, hf_ntp_flags, offset, 1, pkt->flags);
- proto_tree_add_item(ntp_tree, hf_ntp_stratum, offset+1, 1, pkt->stratum);
- proto_tree_add_item(ntp_tree, hf_ntp_ppoll, offset+2, 1, pkt->ppoll);
- proto_tree_add_item(ntp_tree, hf_ntp_precision, offset+3, 1, pkt->precision);
- proto_tree_add_item(ntp_tree, hf_ntp_rootdelay, offset+4, 4, pkt->rootdelay);
- proto_tree_add_item(ntp_tree, hf_ntp_rootdispersion, offset+8, 4, pkt->rootdispersion);
- proto_tree_add_item(ntp_tree, hf_ntp_refid, offset+12, 4, pkt->refid);
- proto_tree_add_item(ntp_tree, hf_ntp_reftime, offset+16, 8, pkt->reftime);
- proto_tree_add_item(ntp_tree, hf_ntp_org, offset+24, 8, pkt->org);
- proto_tree_add_item(ntp_tree, hf_ntp_rec, offset+32, 8, pkt->rec);
- proto_tree_add_item(ntp_tree, hf_ntp_xmt, offset+40, 8, pkt->xmt);
+ flags_tree = proto_item_add_subtree(tf, ETT_NTP_FLAGS);
+ proto_tree_add_item_format(flags_tree, hf_ntp_flags_li, offset, 1,
+ *pkt->flags & NTP_LI_MASK,
+ decode_enumerated_bitfield(*pkt->flags, NTP_LI_MASK,
+ sizeof(pkt->flags) * 8, li_types, "Leap Indicator: %s"));
+ proto_tree_add_item_format(flags_tree, hf_ntp_flags_vn, offset, 1,
+ *pkt->flags & NTP_VN_MASK,
+ decode_enumerated_bitfield(*pkt->flags, NTP_VN_MASK,
+ sizeof(pkt->flags) * 8, ver_nums, "Version number: %s"));
+ proto_tree_add_item_format(flags_tree, hf_ntp_flags_mode, offset, 1,
+ *pkt->flags & NTP_MODE_MASK,
+ decode_enumerated_bitfield(*pkt->flags, NTP_MODE_MASK,
+ sizeof(pkt->flags) * 8, mode_types, "Mode: %s"));
+
+ if (*pkt->stratum == 0) {
+ strcpy (buff, "Peer Clock Stratum: unspecified or unavailable (%d)");
+ } else if (*pkt->stratum == 1) {
+ strcpy (buff, "Peer Clock Stratum: primary reference (%d)");
+ } else if ((*pkt->stratum >= 2) && (*pkt->stratum <= 15)) {
+ strcpy (buff, "Peer Clock Stratum: secondary reference (%d)");
+ } else {
+ strcpy (buff, "Peer Clock Stratum: reserved: %d");
+ }
+ proto_tree_add_item_format(ntp_tree, hf_ntp_stratum, offset+1, 1, pkt->stratum,
+ buff, (int) *pkt->stratum);
+ proto_tree_add_item_format(ntp_tree, hf_ntp_ppoll, offset+2, 1, pkt->ppoll,
+ (((*pkt->ppoll >= 4) && (*pkt->ppoll <= 16)) ?
+ "Peer Pooling Interval: %d (%d sec)" :
+ "Peer Pooling Interval: invalid (%d)"), (int) *pkt->ppoll,
+ 1 << *pkt->ppoll);
+ proto_tree_add_item_format(ntp_tree, hf_ntp_precision, offset+3, 1, pkt->precision,
+ "Peer Clock Precision: %8.6f sec", pow(2, *pkt->precision));
+ proto_tree_add_item_format(ntp_tree, hf_ntp_rootdelay, offset+4, 4, pkt->rootdelay,
+ "Root Delay: %9.4f sec",
+ ((gint32) pntohs(pkt->rootdelay)) +
+ pntohs(pkt->rootdelay + 2) / 65536.0);
+ proto_tree_add_item_format(ntp_tree, hf_ntp_rootdispersion, offset+8, 4, pkt->rootdispersion,
+ "Clock Dispersion: %9.4f sec",
+ ((gint32) pntohs(pkt->rootdispersion)) +
+ pntohs(pkt->rootdispersion + 2) / 65536.0);
+
+ if (*pkt->stratum <= 1) {
+ strcpy (buff, "unindentified reference source");
+ for (i = 0; primary_sources[i].id; i++)
+ if (*((guint32 *) pkt->refid) == *((guint32 *) primary_sources[i].id))
+ strcpy (buff, primary_sources[i].data);
+ } else strcpy (buff, get_hostname (*((u_int *) pkt->refid)));
+ proto_tree_add_item_format(ntp_tree, hf_ntp_refid, offset+12, 4, pkt->refid,
+ "Reference Clock ID: %s", buff);
+ proto_tree_add_item_format(ntp_tree, hf_ntp_reftime, offset+16, 8, pkt->reftime,
+ "Reference Clock Update Time: %s",
+ ntp_fmt_ts((guint32 *) pkt->reftime, buff));
+ proto_tree_add_item_format(ntp_tree, hf_ntp_org, offset+24, 8, pkt->org,
+ "Originate Time Stamp: %s",
+ ntp_fmt_ts((guint32 *) pkt->org, buff));
+ proto_tree_add_item_format(ntp_tree, hf_ntp_rec, offset+32, 8, pkt->rec,
+ "Receive Time Stamp: %s",
+ ntp_fmt_ts((guint32 *) pkt->rec, buff));
+ proto_tree_add_item_format(ntp_tree, hf_ntp_xmt, offset+40, 8, pkt->xmt,
+ "Transmit Time Stamp: %s",
+ ntp_fmt_ts((guint32 *) pkt->xmt, buff));
if ( BYTES_ARE_IN_FRAME(offset, 50) )
proto_tree_add_item(ntp_tree, hf_ntp_keyid, offset+48, 4, pkt->keyid);
if ( BYTES_ARE_IN_FRAME(offset, 53) )
proto_tree_add_item(ntp_tree, hf_ntp_mac, offset+52, END_OF_FRAME, pkt->mac);
+
}
}
{ &hf_ntp_flags, {
"Flags", "ntp.flags", FT_BYTES, BASE_HEX,
NULL, 0, "Flags (Leap/Version/Mode)" }},
+ { &hf_ntp_flags_li, {
+ "Leap Indicator", "ntp.flags.li", FT_UINT8, BASE_DEC,
+ VALS(li_types), 0, "Leap Indicator" }},
+ { &hf_ntp_flags_vn, {
+ "Version number", "ntp.flags.vn", FT_UINT8, BASE_DEC,
+ VALS(ver_nums), 0, "Version number" }},
+ { &hf_ntp_flags_mode, {
+ "Leap Indicator", "ntp.flags.mode", FT_UINT8, BASE_DEC,
+ VALS(mode_types), 0, "Leap Indicator" }},
{ &hf_ntp_stratum, {
- "Peer Clock Stratum", "ntp.stratum", FT_BYTES, BASE_HEX,
+ "Peer Clock Stratum", "ntp.stratum", FT_BYTES, BASE_DEC,
NULL, 0, "Peer Clock Stratum" }},
{ &hf_ntp_ppoll, {
- "Peer Polling Interval", "ntp.ppoll", FT_BYTES, BASE_HEX,
+ "Peer Polling Interval", "ntp.ppoll", FT_BYTES, BASE_DEC,
NULL, 0, "Peer Polling Interval" }},
{ &hf_ntp_precision, {
- "Peer Clock Precision", "ntp.precision", FT_BYTES, BASE_HEX,
+ "Peer Clock Precision", "ntp.precision", FT_BYTES, BASE_DEC,
NULL, 0, "Peer Clock Precision" }},
{ &hf_ntp_rootdelay, {
- "Distance to Primary", "ntp.rootdelay", FT_BYTES, BASE_HEX,
- NULL, 0, "Distance to Primary" }},
+ "Root Delay", "ntp.rootdelay", FT_BYTES, BASE_DEC,
+ NULL, 0, "Root Delay" }},
{ &hf_ntp_rootdispersion, {
- "Clock Dispersion", "ntp.rootdispersion", FT_BYTES, BASE_HEX,
+ "Clock Dispersion", "ntp.rootdispersion", FT_BYTES, BASE_DEC,
NULL, 0, "Clock Dispersion" }},
{ &hf_ntp_refid, {
- "Reference Clock ID", "ntp.refid", FT_BYTES, BASE_HEX,
+ "Reference Clock ID", "ntp.refid", FT_BYTES, BASE_NONE,
NULL, 0, "Reference Clock ID" }},
{ &hf_ntp_reftime, {
- "Reference Clock Update Time", "ntp.reftime", FT_BYTES, BASE_HEX,
+ "Reference Clock Update Time", "ntp.reftime", FT_BYTES, BASE_NONE,
NULL, 0, "Reference Clock Update Time" }},
{ &hf_ntp_org, {
- "Originate Time Stamp", "ntp.org", FT_BYTES, BASE_HEX,
+ "Originate Time Stamp", "ntp.org", FT_BYTES, BASE_NONE,
NULL, 0, "Originate Time Stamp" }},
{ &hf_ntp_rec, {
- "Receive Time Stamp", "ntp.rec", FT_BYTES, BASE_HEX,
+ "Receive Time Stamp", "ntp.rec", FT_BYTES, BASE_NONE,
NULL, 0, "Receive Time Stamp" }},
{ &hf_ntp_xmt, {
- "Transmit Time Stamp", "ntp.xmt", FT_BYTES, BASE_HEX,
+ "Transmit Time Stamp", "ntp.xmt", FT_BYTES, BASE_NONE,
NULL, 0, "Transmit Time Stamp" }},
{ &hf_ntp_keyid, {
"Key ID", "ntp.keyid", FT_BYTES, BASE_HEX,
git.samba.org / obnox / wireshark / wip.git / commitdiff