430 lines
13 KiB
C
430 lines
13 KiB
C
/*
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* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Format and print ntp packets.
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* By Jeffrey Mogul/DECWRL
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* loosely based on print-bootp.c
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*
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* $FreeBSD$
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*/
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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#ifdef HAVE_STRFTIME
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#include <time.h>
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#endif
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h"
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/*
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* Based on ntp.h from the U of MD implementation
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* This file is based on Version 2 of the NTP spec (RFC1119).
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*/
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/*
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* Definitions for the masses
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*/
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#define JAN_1970 2208988800U /* 1970 - 1900 in seconds */
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/*
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* Structure definitions for NTP fixed point values
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Integer Part |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Fraction Part |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Integer Part | Fraction Part |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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struct l_fixedpt {
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uint32_t int_part;
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uint32_t fraction;
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};
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struct s_fixedpt {
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uint16_t int_part;
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uint16_t fraction;
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};
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/* rfc2030
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* 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |LI | VN |Mode | Stratum | Poll | Precision |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Root Delay |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Root Dispersion |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reference Identifier |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Reference Timestamp (64) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Originate Timestamp (64) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Receive Timestamp (64) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Transmit Timestamp (64) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Key Identifier (optional) (32) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | |
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* | Message Digest (optional) (128) |
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* | |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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struct ntpdata {
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u_char status; /* status of local clock and leap info */
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u_char stratum; /* Stratum level */
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u_char ppoll; /* poll value */
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int precision:8;
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struct s_fixedpt root_delay;
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struct s_fixedpt root_dispersion;
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uint32_t refid;
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struct l_fixedpt ref_timestamp;
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struct l_fixedpt org_timestamp;
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struct l_fixedpt rec_timestamp;
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struct l_fixedpt xmt_timestamp;
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uint32_t key_id;
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uint8_t message_digest[16];
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};
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/*
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* Leap Second Codes (high order two bits)
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*/
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#define NO_WARNING 0x00 /* no warning */
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#define PLUS_SEC 0x40 /* add a second (61 seconds) */
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#define MINUS_SEC 0x80 /* minus a second (59 seconds) */
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#define ALARM 0xc0 /* alarm condition (clock unsynchronized) */
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/*
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* Clock Status Bits that Encode Version
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*/
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#define NTPVERSION_1 0x08
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#define VERSIONMASK 0x38
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#define LEAPMASK 0xc0
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#ifdef MODEMASK
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#undef MODEMASK /* Solaris sucks */
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#endif
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#define MODEMASK 0x07
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/*
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* Code values
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*/
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#define MODE_UNSPEC 0 /* unspecified */
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#define MODE_SYM_ACT 1 /* symmetric active */
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#define MODE_SYM_PAS 2 /* symmetric passive */
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#define MODE_CLIENT 3 /* client */
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#define MODE_SERVER 4 /* server */
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#define MODE_BROADCAST 5 /* broadcast */
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#define MODE_RES1 6 /* reserved */
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#define MODE_RES2 7 /* reserved */
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/*
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* Stratum Definitions
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*/
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#define UNSPECIFIED 0
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#define PRIM_REF 1 /* radio clock */
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#define INFO_QUERY 62 /* **** THIS implementation dependent **** */
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#define INFO_REPLY 63 /* **** THIS implementation dependent **** */
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static void p_sfix(netdissect_options *ndo, const struct s_fixedpt *);
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static void p_ntp_time(netdissect_options *, const struct l_fixedpt *);
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static void p_ntp_delta(netdissect_options *, const struct l_fixedpt *, const struct l_fixedpt *);
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static const struct tok ntp_mode_values[] = {
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{ MODE_UNSPEC, "unspecified" },
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{ MODE_SYM_ACT, "symmetric active" },
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{ MODE_SYM_PAS, "symmetric passive" },
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{ MODE_CLIENT, "Client" },
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{ MODE_SERVER, "Server" },
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{ MODE_BROADCAST, "Broadcast" },
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{ MODE_RES1, "Reserved" },
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{ MODE_RES2, "Reserved" },
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{ 0, NULL }
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};
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static const struct tok ntp_leapind_values[] = {
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{ NO_WARNING, "" },
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{ PLUS_SEC, "+1s" },
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{ MINUS_SEC, "-1s" },
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{ ALARM, "clock unsynchronized" },
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{ 0, NULL }
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};
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static const struct tok ntp_stratum_values[] = {
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{ UNSPECIFIED, "unspecified" },
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{ PRIM_REF, "primary reference" },
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{ 0, NULL }
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};
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/*
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* Print ntp requests
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*/
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void
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ntp_print(netdissect_options *ndo,
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register const u_char *cp, u_int length)
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{
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register const struct ntpdata *bp;
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int mode, version, leapind;
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bp = (struct ntpdata *)cp;
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ND_TCHECK(bp->status);
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version = (int)(bp->status & VERSIONMASK) >> 3;
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ND_PRINT((ndo, "NTPv%d", version));
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mode = bp->status & MODEMASK;
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if (!ndo->ndo_vflag) {
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ND_PRINT((ndo, ", %s, length %u",
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tok2str(ntp_mode_values, "Unknown mode", mode),
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length));
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return;
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}
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ND_PRINT((ndo, ", length %u\n\t%s",
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length,
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tok2str(ntp_mode_values, "Unknown mode", mode)));
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leapind = bp->status & LEAPMASK;
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ND_PRINT((ndo, ", Leap indicator: %s (%u)",
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tok2str(ntp_leapind_values, "Unknown", leapind),
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leapind));
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ND_TCHECK(bp->stratum);
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ND_PRINT((ndo, ", Stratum %u (%s)",
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bp->stratum,
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tok2str(ntp_stratum_values, (bp->stratum >=2 && bp->stratum<=15) ? "secondary reference" : "reserved", bp->stratum)));
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ND_TCHECK(bp->ppoll);
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ND_PRINT((ndo, ", poll %u (%us)", bp->ppoll, 1 << bp->ppoll));
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/* Can't ND_TCHECK bp->precision bitfield so bp->distance + 0 instead */
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ND_TCHECK2(bp->root_delay, 0);
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ND_PRINT((ndo, ", precision %d", bp->precision));
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ND_TCHECK(bp->root_delay);
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ND_PRINT((ndo, "\n\tRoot Delay: "));
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p_sfix(ndo, &bp->root_delay);
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ND_TCHECK(bp->root_dispersion);
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ND_PRINT((ndo, ", Root dispersion: "));
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p_sfix(ndo, &bp->root_dispersion);
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ND_TCHECK(bp->refid);
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ND_PRINT((ndo, ", Reference-ID: "));
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/* Interpretation depends on stratum */
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switch (bp->stratum) {
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case UNSPECIFIED:
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ND_PRINT((ndo, "(unspec)"));
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break;
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case PRIM_REF:
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if (fn_printn(ndo, (u_char *)&(bp->refid), 4, ndo->ndo_snapend))
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goto trunc;
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break;
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case INFO_QUERY:
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ND_PRINT((ndo, "%s INFO_QUERY", ipaddr_string(ndo, &(bp->refid))));
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/* this doesn't have more content */
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return;
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case INFO_REPLY:
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ND_PRINT((ndo, "%s INFO_REPLY", ipaddr_string(ndo, &(bp->refid))));
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/* this is too complex to be worth printing */
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return;
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default:
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ND_PRINT((ndo, "%s", ipaddr_string(ndo, &(bp->refid))));
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break;
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}
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ND_TCHECK(bp->ref_timestamp);
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ND_PRINT((ndo, "\n\t Reference Timestamp: "));
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p_ntp_time(ndo, &(bp->ref_timestamp));
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ND_TCHECK(bp->org_timestamp);
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ND_PRINT((ndo, "\n\t Originator Timestamp: "));
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p_ntp_time(ndo, &(bp->org_timestamp));
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ND_TCHECK(bp->rec_timestamp);
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ND_PRINT((ndo, "\n\t Receive Timestamp: "));
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p_ntp_time(ndo, &(bp->rec_timestamp));
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ND_TCHECK(bp->xmt_timestamp);
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ND_PRINT((ndo, "\n\t Transmit Timestamp: "));
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p_ntp_time(ndo, &(bp->xmt_timestamp));
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ND_PRINT((ndo, "\n\t Originator - Receive Timestamp: "));
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p_ntp_delta(ndo, &(bp->org_timestamp), &(bp->rec_timestamp));
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ND_PRINT((ndo, "\n\t Originator - Transmit Timestamp: "));
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p_ntp_delta(ndo, &(bp->org_timestamp), &(bp->xmt_timestamp));
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if ( (sizeof(struct ntpdata) - length) == 16) { /* Optional: key-id */
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ND_TCHECK(bp->key_id);
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ND_PRINT((ndo, "\n\tKey id: %u", bp->key_id));
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} else if ( (sizeof(struct ntpdata) - length) == 0) { /* Optional: key-id + authentication */
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ND_TCHECK(bp->key_id);
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ND_PRINT((ndo, "\n\tKey id: %u", bp->key_id));
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ND_TCHECK2(bp->message_digest, sizeof (bp->message_digest));
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ND_PRINT((ndo, "\n\tAuthentication: %08x%08x%08x%08x",
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EXTRACT_32BITS(bp->message_digest),
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EXTRACT_32BITS(bp->message_digest + 4),
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EXTRACT_32BITS(bp->message_digest + 8),
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EXTRACT_32BITS(bp->message_digest + 12)));
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}
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return;
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trunc:
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ND_PRINT((ndo, " [|ntp]"));
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}
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static void
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p_sfix(netdissect_options *ndo,
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register const struct s_fixedpt *sfp)
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{
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register int i;
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register int f;
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register float ff;
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i = EXTRACT_16BITS(&sfp->int_part);
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f = EXTRACT_16BITS(&sfp->fraction);
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ff = f / 65536.0; /* shift radix point by 16 bits */
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f = ff * 1000000.0; /* Treat fraction as parts per million */
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ND_PRINT((ndo, "%d.%06d", i, f));
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}
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#define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */
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static void
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p_ntp_time(netdissect_options *ndo,
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register const struct l_fixedpt *lfp)
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{
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register int32_t i;
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register uint32_t uf;
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register uint32_t f;
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register float ff;
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i = EXTRACT_32BITS(&lfp->int_part);
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uf = EXTRACT_32BITS(&lfp->fraction);
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ff = uf;
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if (ff < 0.0) /* some compilers are buggy */
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ff += FMAXINT;
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ff = ff / FMAXINT; /* shift radix point by 32 bits */
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f = ff * 1000000000.0; /* treat fraction as parts per billion */
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ND_PRINT((ndo, "%u.%09d", i, f));
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#ifdef HAVE_STRFTIME
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/*
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* print the time in human-readable format.
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*/
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if (i) {
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time_t seconds = i - JAN_1970;
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struct tm *tm;
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char time_buf[128];
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tm = localtime(&seconds);
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strftime(time_buf, sizeof (time_buf), "%Y/%m/%d %H:%M:%S", tm);
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ND_PRINT((ndo, " (%s)", time_buf));
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}
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#endif
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}
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/* Prints time difference between *lfp and *olfp */
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static void
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p_ntp_delta(netdissect_options *ndo,
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register const struct l_fixedpt *olfp,
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register const struct l_fixedpt *lfp)
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{
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register int32_t i;
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register uint32_t u, uf;
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register uint32_t ou, ouf;
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register uint32_t f;
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register float ff;
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int signbit;
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u = EXTRACT_32BITS(&lfp->int_part);
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ou = EXTRACT_32BITS(&olfp->int_part);
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uf = EXTRACT_32BITS(&lfp->fraction);
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ouf = EXTRACT_32BITS(&olfp->fraction);
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if (ou == 0 && ouf == 0) {
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p_ntp_time(ndo, lfp);
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return;
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}
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i = u - ou;
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if (i > 0) { /* new is definitely greater than old */
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signbit = 0;
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f = uf - ouf;
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if (ouf > uf) /* must borrow from high-order bits */
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i -= 1;
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} else if (i < 0) { /* new is definitely less than old */
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signbit = 1;
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f = ouf - uf;
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if (uf > ouf) /* must carry into the high-order bits */
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i += 1;
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i = -i;
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} else { /* int_part is zero */
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if (uf > ouf) {
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signbit = 0;
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f = uf - ouf;
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} else {
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signbit = 1;
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f = ouf - uf;
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}
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}
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ff = f;
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if (ff < 0.0) /* some compilers are buggy */
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ff += FMAXINT;
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ff = ff / FMAXINT; /* shift radix point by 32 bits */
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f = ff * 1000000000.0; /* treat fraction as parts per billion */
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ND_PRINT((ndo, "%s%d.%09d", signbit ? "-" : "+", i, f));
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}
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