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+/*
+ * Copyright (c) 2000 Ben Smithurst <ben@scientia.demon.co.uk>
+ * 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.
+ */
+
+/* \summary: Berkeley UNIX Time Synchronization Protocol */
+
+/* specification: https://docs.freebsd.org/44doc/smm/12.timed/paper.pdf */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "extract.h"
+
+struct tsp_timeval {
+ nd_int32_t tv_sec;
+ nd_int32_t tv_usec;
+};
+
+struct tsp {
+ nd_uint8_t tsp_type;
+ nd_uint8_t tsp_vers;
+ nd_uint16_t tsp_seq;
+ union {
+ struct tsp_timeval tspu_time;
+ nd_int8_t tspu_hopcnt;
+ } tsp_u;
+ nd_byte tsp_name[256]; /* null-terminated string up to 256 */
+};
+
+#define tsp_time tsp_u.tspu_time
+#define tsp_hopcnt tsp_u.tspu_hopcnt
+
+/*
+ * Command types.
+ */
+#define TSP_ANY 0 /* match any types */
+#define TSP_ADJTIME 1 /* send adjtime */
+#define TSP_ACK 2 /* generic acknowledgement */
+#define TSP_MASTERREQ 3 /* ask for master's name */
+#define TSP_MASTERACK 4 /* acknowledge master request */
+#define TSP_SETTIME 5 /* send network time */
+#define TSP_MASTERUP 6 /* inform slaves that master is up */
+#define TSP_SLAVEUP 7 /* slave is up but not polled */
+#define TSP_ELECTION 8 /* advance candidature for master */
+#define TSP_ACCEPT 9 /* support candidature of master */
+#define TSP_REFUSE 10 /* reject candidature of master */
+#define TSP_CONFLICT 11 /* two or more masters present */
+#define TSP_RESOLVE 12 /* masters' conflict resolution */
+#define TSP_QUIT 13 /* reject candidature if master is up */
+#define TSP_DATE 14 /* reset the time (date command) */
+#define TSP_DATEREQ 15 /* remote request to reset the time */
+#define TSP_DATEACK 16 /* acknowledge time setting */
+#define TSP_TRACEON 17 /* turn tracing on */
+#define TSP_TRACEOFF 18 /* turn tracing off */
+#define TSP_MSITE 19 /* find out master's site */
+#define TSP_MSITEREQ 20 /* remote master's site request */
+#define TSP_TEST 21 /* for testing election algo */
+#define TSP_SETDATE 22 /* New from date command */
+#define TSP_SETDATEREQ 23 /* New remote for above */
+#define TSP_LOOP 24 /* loop detection packet */
+static const struct tok tsptype_str[] = {
+ { TSP_ANY, "TSP_ANY" },
+ { TSP_ADJTIME, "TSP_ADJTIME" },
+ { TSP_ACK, "TSP_ACK" },
+ { TSP_MASTERREQ, "TSP_MASTERREQ" },
+ { TSP_MASTERACK, "TSP_MASTERACK" },
+ { TSP_SETTIME, "TSP_SETTIME" },
+ { TSP_MASTERUP, "TSP_MASTERUP" },
+ { TSP_SLAVEUP, "TSP_SLAVEUP" },
+ { TSP_ELECTION, "TSP_ELECTION" },
+ { TSP_ACCEPT, "TSP_ACCEPT" },
+ { TSP_REFUSE, "TSP_REFUSE" },
+ { TSP_CONFLICT, "TSP_CONFLICT" },
+ { TSP_RESOLVE, "TSP_RESOLVE" },
+ { TSP_QUIT, "TSP_QUIT" },
+ { TSP_DATE, "TSP_DATE" },
+ { TSP_DATEREQ, "TSP_DATEREQ" },
+ { TSP_DATEACK, "TSP_DATEACK" },
+ { TSP_TRACEON, "TSP_TRACEON" },
+ { TSP_TRACEOFF, "TSP_TRACEOFF" },
+ { TSP_MSITE, "TSP_MSITE" },
+ { TSP_MSITEREQ, "TSP_MSITEREQ" },
+ { TSP_TEST, "TSP_TEST" },
+ { TSP_SETDATE, "TSP_SETDATE" },
+ { TSP_SETDATEREQ, "TSP_SETDATEREQ" },
+ { TSP_LOOP, "TSP_LOOP" },
+ { 0, NULL }
+};
+
+void
+timed_print(netdissect_options *ndo,
+ const u_char *bp)
+{
+ const struct tsp *tsp = (const struct tsp *)bp;
+ uint8_t tsp_type;
+ int sec, usec;
+
+ ndo->ndo_protocol = "timed";
+ tsp_type = GET_U_1(tsp->tsp_type);
+ ND_PRINT("%s", tok2str(tsptype_str, "(tsp_type %#x)", tsp_type));
+
+ ND_PRINT(" vers %u", GET_U_1(tsp->tsp_vers));
+
+ ND_PRINT(" seq %u", GET_BE_U_2(tsp->tsp_seq));
+
+ switch (tsp_type) {
+ case TSP_LOOP:
+ ND_PRINT(" hopcnt %u", GET_U_1(tsp->tsp_hopcnt));
+ break;
+ case TSP_SETTIME:
+ case TSP_ADJTIME:
+ case TSP_SETDATE:
+ case TSP_SETDATEREQ:
+ sec = GET_BE_S_4(tsp->tsp_time.tv_sec);
+ usec = GET_BE_S_4(tsp->tsp_time.tv_usec);
+ /* XXX The comparison below is always false? */
+ if (usec < 0)
+ /* invalid, skip the rest of the packet */
+ return;
+ ND_PRINT(" time ");
+ if (sec < 0 && usec != 0) {
+ sec++;
+ if (sec == 0)
+ ND_PRINT("-");
+ usec = 1000000 - usec;
+ }
+ ND_PRINT("%d.%06d", sec, usec);
+ break;
+ }
+ ND_PRINT(" name ");
+ nd_printjnp(ndo, tsp->tsp_name, sizeof(tsp->tsp_name));
+}