| /* |
| * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University nor the names of its contributors may be used to endorse |
| * or promote products derived from this software without specific prior |
| * written permission. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * 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 |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <tcpdump-stdinc.h> |
| |
| #ifdef HAVE_STRFTIME |
| #include <time.h> |
| #endif |
| |
| #include "interface.h" |
| #include "addrtoname.h" |
| #include "extract.h" |
| |
| /* |
| * 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 */ |
| |
| /* |
| * Structure definitions for NTP fixed point values |
| * |
| * 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Integer Part | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Fraction Part | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| * 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Integer Part | Fraction Part | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| */ |
| struct l_fixedpt { |
| uint32_t int_part; |
| uint32_t fraction; |
| }; |
| |
| struct s_fixedpt { |
| uint16_t int_part; |
| uint16_t fraction; |
| }; |
| |
| /* rfc2030 |
| * 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 | Stratum | Poll | Precision | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Root Delay | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Root Dispersion | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Reference Identifier | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | | |
| * | Reference Timestamp (64) | |
| * | | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | | |
| * | Originate Timestamp (64) | |
| * | | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | | |
| * | Receive Timestamp (64) | |
| * | | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | | |
| * | Transmit Timestamp (64) | |
| * | | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Key Identifier (optional) (32) | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | | |
| * | | |
| * | Message Digest (optional) (128) | |
| * | | |
| * | | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| */ |
| |
| 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; |
| struct s_fixedpt root_delay; |
| struct s_fixedpt root_dispersion; |
| 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]; |
| }; |
| /* |
| * Leap Second Codes (high order two bits) |
| */ |
| #define NO_WARNING 0x00 /* no warning */ |
| #define PLUS_SEC 0x40 /* add a second (61 seconds) */ |
| #define MINUS_SEC 0x80 /* minus a second (59 seconds) */ |
| #define ALARM 0xc0 /* alarm condition (clock unsynchronized) */ |
| |
| /* |
| * Clock Status Bits that Encode Version |
| */ |
| #define NTPVERSION_1 0x08 |
| #define VERSIONMASK 0x38 |
| #define LEAPMASK 0xc0 |
| #ifdef MODEMASK |
| #undef MODEMASK /* Solaris sucks */ |
| #endif |
| #define MODEMASK 0x07 |
| |
| /* |
| * Code values |
| */ |
| #define MODE_UNSPEC 0 /* unspecified */ |
| #define MODE_SYM_ACT 1 /* symmetric active */ |
| #define MODE_SYM_PAS 2 /* symmetric passive */ |
| #define MODE_CLIENT 3 /* client */ |
| #define MODE_SERVER 4 /* server */ |
| #define MODE_BROADCAST 5 /* broadcast */ |
| #define MODE_RES1 6 /* reserved */ |
| #define MODE_RES2 7 /* reserved */ |
| |
| /* |
| * Stratum Definitions |
| */ |
| #define UNSPECIFIED 0 |
| #define PRIM_REF 1 /* radio clock */ |
| #define INFO_QUERY 62 /* **** THIS implementation dependent **** */ |
| #define INFO_REPLY 63 /* **** THIS implementation dependent **** */ |
| |
| 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 const struct tok ntp_mode_values[] = { |
| { MODE_UNSPEC, "unspecified" }, |
| { MODE_SYM_ACT, "symmetric active" }, |
| { MODE_SYM_PAS, "symmetric passive" }, |
| { MODE_CLIENT, "Client" }, |
| { MODE_SERVER, "Server" }, |
| { MODE_BROADCAST, "Broadcast" }, |
| { MODE_RES1, "Reserved" }, |
| { MODE_RES2, "Reserved" }, |
| { 0, NULL } |
| }; |
| |
| static const struct tok ntp_leapind_values[] = { |
| { NO_WARNING, "" }, |
| { PLUS_SEC, "+1s" }, |
| { MINUS_SEC, "-1s" }, |
| { ALARM, "clock unsynchronized" }, |
| { 0, NULL } |
| }; |
| |
| static const struct tok ntp_stratum_values[] = { |
| { UNSPECIFIED, "unspecified" }, |
| { PRIM_REF, "primary reference" }, |
| { 0, NULL } |
| }; |
| |
| /* |
| * Print ntp requests |
| */ |
| void |
| ntp_print(netdissect_options *ndo, |
| register const u_char *cp, u_int length) |
| { |
| register const struct ntpdata *bp; |
| int mode, version, leapind; |
| |
| bp = (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; |
| } |
| |
| ND_PRINT((ndo, ", length %u\n\t%s", |
| length, |
| tok2str(ntp_mode_values, "Unknown mode", mode))); |
| |
| leapind = bp->status & LEAPMASK; |
| ND_PRINT((ndo, ", Leap indicator: %s (%u)", |
| tok2str(ntp_leapind_values, "Unknown", leapind), |
| leapind)); |
| |
| 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(bp->ppoll); |
| ND_PRINT((ndo, ", poll %u (%us)", bp->ppoll, 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(bp->root_delay); |
| ND_PRINT((ndo, "\n\tRoot Delay: ")); |
| p_sfix(ndo, &bp->root_delay); |
| |
| ND_TCHECK(bp->root_dispersion); |
| ND_PRINT((ndo, ", Root dispersion: ")); |
| p_sfix(ndo, &bp->root_dispersion); |
| |
| ND_TCHECK(bp->refid); |
| ND_PRINT((ndo, ", Reference-ID: ")); |
| /* Interpretation depends on stratum */ |
| switch (bp->stratum) { |
| |
| case UNSPECIFIED: |
| ND_PRINT((ndo, "(unspec)")); |
| break; |
| |
| case PRIM_REF: |
| if (fn_printn(ndo, (u_char *)&(bp->refid), 4, ndo->ndo_snapend)) |
| goto trunc; |
| break; |
| |
| case INFO_QUERY: |
| ND_PRINT((ndo, "%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)))); |
| /* this is too complex to be worth printing */ |
| return; |
| |
| default: |
| ND_PRINT((ndo, "%s", ipaddr_string(ndo, &(bp->refid)))); |
| break; |
| } |
| |
| ND_TCHECK(bp->ref_timestamp); |
| ND_PRINT((ndo, "\n\t Reference Timestamp: ")); |
| p_ntp_time(ndo, &(bp->ref_timestamp)); |
| |
| ND_TCHECK(bp->org_timestamp); |
| ND_PRINT((ndo, "\n\t Originator Timestamp: ")); |
| p_ntp_time(ndo, &(bp->org_timestamp)); |
| |
| ND_TCHECK(bp->rec_timestamp); |
| ND_PRINT((ndo, "\n\t Receive Timestamp: ")); |
| p_ntp_time(ndo, &(bp->rec_timestamp)); |
| |
| ND_TCHECK(bp->xmt_timestamp); |
| ND_PRINT((ndo, "\n\t Transmit Timestamp: ")); |
| p_ntp_time(ndo, &(bp->xmt_timestamp)); |
| |
| ND_PRINT((ndo, "\n\t Originator - Receive Timestamp: ")); |
| p_ntp_delta(ndo, &(bp->org_timestamp), &(bp->rec_timestamp)); |
| |
| ND_PRINT((ndo, "\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))); |
| } |
| return; |
| |
| trunc: |
| ND_PRINT((ndo, " [|ntp]")); |
| } |
| |
| static void |
| p_sfix(netdissect_options *ndo, |
| register 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)); |
| } |
| |
| #define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */ |
| |
| static void |
| p_ntp_time(netdissect_options *ndo, |
| register const struct l_fixedpt *lfp) |
| { |
| register int32_t i; |
| register uint32_t uf; |
| register uint32_t f; |
| register float ff; |
| |
| 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 */ |
| ND_PRINT((ndo, "%u.%09d", i, f)); |
| |
| #ifdef HAVE_STRFTIME |
| /* |
| * print the time in human-readable format. |
| */ |
| if (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); |
| ND_PRINT((ndo, " (%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) |
| { |
| register int32_t i; |
| register uint32_t u, uf; |
| register uint32_t ou, ouf; |
| register uint32_t f; |
| register float 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); |
| if (ou == 0 && ouf == 0) { |
| p_ntp_time(ndo, lfp); |
| return; |
| } |
| |
| i = u - ou; |
| |
| if (i > 0) { /* new is definitely greater than old */ |
| signbit = 0; |
| f = uf - ouf; |
| if (ouf > uf) /* must borrow from high-order bits */ |
| i -= 1; |
| } else if (i < 0) { /* new is definitely less than old */ |
| signbit = 1; |
| f = ouf - uf; |
| if (uf > ouf) /* must carry into the high-order bits */ |
| i += 1; |
| i = -i; |
| } else { /* int_part is zero */ |
| if (uf > ouf) { |
| signbit = 0; |
| f = uf - ouf; |
| } else { |
| signbit = 1; |
| f = ouf - uf; |
| } |
| } |
| |
| 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)); |
| } |
| |
