vendor/tcpdump/4.9.3

1 files changed, 427 insertions, 0 deletions

diff --git a/print-ntp.c b/print-ntp.c
new file mode 100644
index 0000000000000..0689264ff74bb
--- /dev/null
+++ b/print-ntp.c
@@ -0,0 +1,427 @@
+/*
+ * 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 <netdissect-stdinc.h>
+
+#ifdef HAVE_STRFTIME
+#include <time.h>
+#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));
+}
+