/* * 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. * * By Jeffrey Mogul/DECWRL * loosely based on print-bootp.c */ /* \summary: Network Time Protocol (NTP) printer */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #ifdef HAVE_STRFTIME #include #endif #include "netdissect.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 = (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; } 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, (const 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 double ff; i = EXTRACT_16BITS(&sfp->int_part); f = EXTRACT_16BITS(&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((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 double 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 = (uint32_t)(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 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); 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 = (uint32_t)(ff * 1000000000.0); /* treat fraction as parts per billion */ ND_PRINT((ndo, "%s%d.%09d", signbit ? "-" : "+", i, f)); }