1 /* 2 * Copyright (c) 2000 Ben Smithurst <ben@scientia.demon.co.uk> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 */ 21 22 /* \summary: Berkeley UNIX Time Synchronization Protocol */ 23 24 /* specification: https://docs.freebsd.org/44doc/smm/12.timed/paper.pdf */ 25 26 #ifdef HAVE_CONFIG_H 27 #include <config.h> 28 #endif 29 30 #include "netdissect-stdinc.h" 31 32 #include "netdissect.h" 33 #include "extract.h" 34 35 struct tsp_timeval { 36 nd_int32_t tv_sec; 37 nd_int32_t tv_usec; 38 }; 39 40 struct tsp { 41 nd_uint8_t tsp_type; 42 nd_uint8_t tsp_vers; 43 nd_uint16_t tsp_seq; 44 union { 45 struct tsp_timeval tspu_time; 46 nd_int8_t tspu_hopcnt; 47 } tsp_u; 48 nd_byte tsp_name[256]; /* null-terminated string up to 256 */ 49 }; 50 51 #define tsp_time tsp_u.tspu_time 52 #define tsp_hopcnt tsp_u.tspu_hopcnt 53 54 /* 55 * Command types. 56 */ 57 #define TSP_ANY 0 /* match any types */ 58 #define TSP_ADJTIME 1 /* send adjtime */ 59 #define TSP_ACK 2 /* generic acknowledgement */ 60 #define TSP_MASTERREQ 3 /* ask for master's name */ 61 #define TSP_MASTERACK 4 /* acknowledge master request */ 62 #define TSP_SETTIME 5 /* send network time */ 63 #define TSP_MASTERUP 6 /* inform slaves that master is up */ 64 #define TSP_SLAVEUP 7 /* slave is up but not polled */ 65 #define TSP_ELECTION 8 /* advance candidature for master */ 66 #define TSP_ACCEPT 9 /* support candidature of master */ 67 #define TSP_REFUSE 10 /* reject candidature of master */ 68 #define TSP_CONFLICT 11 /* two or more masters present */ 69 #define TSP_RESOLVE 12 /* masters' conflict resolution */ 70 #define TSP_QUIT 13 /* reject candidature if master is up */ 71 #define TSP_DATE 14 /* reset the time (date command) */ 72 #define TSP_DATEREQ 15 /* remote request to reset the time */ 73 #define TSP_DATEACK 16 /* acknowledge time setting */ 74 #define TSP_TRACEON 17 /* turn tracing on */ 75 #define TSP_TRACEOFF 18 /* turn tracing off */ 76 #define TSP_MSITE 19 /* find out master's site */ 77 #define TSP_MSITEREQ 20 /* remote master's site request */ 78 #define TSP_TEST 21 /* for testing election algo */ 79 #define TSP_SETDATE 22 /* New from date command */ 80 #define TSP_SETDATEREQ 23 /* New remote for above */ 81 #define TSP_LOOP 24 /* loop detection packet */ 82 static const struct tok tsptype_str[] = { 83 { TSP_ANY, "TSP_ANY" }, 84 { TSP_ADJTIME, "TSP_ADJTIME" }, 85 { TSP_ACK, "TSP_ACK" }, 86 { TSP_MASTERREQ, "TSP_MASTERREQ" }, 87 { TSP_MASTERACK, "TSP_MASTERACK" }, 88 { TSP_SETTIME, "TSP_SETTIME" }, 89 { TSP_MASTERUP, "TSP_MASTERUP" }, 90 { TSP_SLAVEUP, "TSP_SLAVEUP" }, 91 { TSP_ELECTION, "TSP_ELECTION" }, 92 { TSP_ACCEPT, "TSP_ACCEPT" }, 93 { TSP_REFUSE, "TSP_REFUSE" }, 94 { TSP_CONFLICT, "TSP_CONFLICT" }, 95 { TSP_RESOLVE, "TSP_RESOLVE" }, 96 { TSP_QUIT, "TSP_QUIT" }, 97 { TSP_DATE, "TSP_DATE" }, 98 { TSP_DATEREQ, "TSP_DATEREQ" }, 99 { TSP_DATEACK, "TSP_DATEACK" }, 100 { TSP_TRACEON, "TSP_TRACEON" }, 101 { TSP_TRACEOFF, "TSP_TRACEOFF" }, 102 { TSP_MSITE, "TSP_MSITE" }, 103 { TSP_MSITEREQ, "TSP_MSITEREQ" }, 104 { TSP_TEST, "TSP_TEST" }, 105 { TSP_SETDATE, "TSP_SETDATE" }, 106 { TSP_SETDATEREQ, "TSP_SETDATEREQ" }, 107 { TSP_LOOP, "TSP_LOOP" }, 108 { 0, NULL } 109 }; 110 111 void 112 timed_print(netdissect_options *ndo, 113 const u_char *bp) 114 { 115 const struct tsp *tsp = (const struct tsp *)bp; 116 uint8_t tsp_type; 117 int sec, usec; 118 119 ndo->ndo_protocol = "timed"; 120 tsp_type = GET_U_1(tsp->tsp_type); 121 ND_PRINT("%s", tok2str(tsptype_str, "(tsp_type %#x)", tsp_type)); 122 123 ND_PRINT(" vers %u", GET_U_1(tsp->tsp_vers)); 124 125 ND_PRINT(" seq %u", GET_BE_U_2(tsp->tsp_seq)); 126 127 switch (tsp_type) { 128 case TSP_LOOP: 129 ND_PRINT(" hopcnt %u", GET_U_1(tsp->tsp_hopcnt)); 130 break; 131 case TSP_SETTIME: 132 case TSP_ADJTIME: 133 case TSP_SETDATE: 134 case TSP_SETDATEREQ: 135 sec = GET_BE_S_4(tsp->tsp_time.tv_sec); 136 usec = GET_BE_S_4(tsp->tsp_time.tv_usec); 137 /* XXX The comparison below is always false? */ 138 if (usec < 0) 139 /* invalid, skip the rest of the packet */ 140 return; 141 ND_PRINT(" time "); 142 if (sec < 0 && usec != 0) { 143 sec++; 144 if (sec == 0) 145 ND_PRINT("-"); 146 usec = 1000000 - usec; 147 } 148 ND_PRINT("%d.%06d", sec, usec); 149 break; 150 } 151 ND_PRINT(" name "); 152 nd_printjnp(ndo, tsp->tsp_name, sizeof(tsp->tsp_name)); 153 } 154