1*d881c474Schristos /* 2*d881c474Schristos * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 3*d881c474Schristos * The Regents of the University of California. All rights reserved. 4*d881c474Schristos * 5*d881c474Schristos * Redistribution and use in source and binary forms, with or without 6*d881c474Schristos * modification, are permitted provided that: (1) source code distributions 7*d881c474Schristos * retain the above copyright notice and this paragraph in its entirety, (2) 8*d881c474Schristos * distributions including binary code include the above copyright notice and 9*d881c474Schristos * this paragraph in its entirety in the documentation or other materials 10*d881c474Schristos * provided with the distribution, and (3) all advertising materials mentioning 11*d881c474Schristos * features or use of this software display the following acknowledgement: 12*d881c474Schristos * ``This product includes software developed by the University of California, 13*d881c474Schristos * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14*d881c474Schristos * the University nor the names of its contributors may be used to endorse 15*d881c474Schristos * or promote products derived from this software without specific prior 16*d881c474Schristos * written permission. 17*d881c474Schristos * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18*d881c474Schristos * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19*d881c474Schristos * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20*d881c474Schristos * 21*d881c474Schristos */ 22*d881c474Schristos 23*d881c474Schristos #include <config.h> 24*d881c474Schristos 25*d881c474Schristos #include "ntp.h" 26*d881c474Schristos 27*d881c474Schristos #include "extract.h" 28*d881c474Schristos 29*d881c474Schristos #define JAN_1970 INT64_T_CONSTANT(2208988800) /* 1970 - 1900 in seconds */ 30*d881c474Schristos 31*d881c474Schristos void 32*d881c474Schristos p_ntp_time(netdissect_options *ndo, 33*d881c474Schristos const struct l_fixedpt *lfp) 34*d881c474Schristos { 35*d881c474Schristos uint32_t i; 36*d881c474Schristos uint32_t uf; 37*d881c474Schristos uint32_t f; 38*d881c474Schristos double ff; 39*d881c474Schristos 40*d881c474Schristos i = GET_BE_U_4(lfp->int_part); 41*d881c474Schristos uf = GET_BE_U_4(lfp->fraction); 42*d881c474Schristos ff = uf; 43*d881c474Schristos if (ff < 0.0) /* some compilers are buggy */ 44*d881c474Schristos ff += FMAXINT; 45*d881c474Schristos ff = ff / FMAXINT; /* shift radix point by 32 bits */ 46*d881c474Schristos f = (uint32_t)(ff * 1000000000.0); /* treat fraction as parts per billion */ 47*d881c474Schristos ND_PRINT("%u.%09u", i, f); 48*d881c474Schristos 49*d881c474Schristos /* 50*d881c474Schristos * print the UTC time in human-readable format. 51*d881c474Schristos */ 52*d881c474Schristos if (i) { 53*d881c474Schristos int64_t seconds_64bit = (int64_t)i - JAN_1970; 54*d881c474Schristos time_t seconds; 55*d881c474Schristos char time_buf[128]; 56*d881c474Schristos const char *time_string; 57*d881c474Schristos 58*d881c474Schristos seconds = (time_t)seconds_64bit; 59*d881c474Schristos if (seconds != seconds_64bit) { 60*d881c474Schristos /* 61*d881c474Schristos * It doesn't fit into a time_t, so we can't hand it 62*d881c474Schristos * to gmtime. 63*d881c474Schristos */ 64*d881c474Schristos time_string = "[Time is too large to fit into a time_t]"; 65*d881c474Schristos } else { 66*d881c474Schristos /* use ISO 8601 (RFC3339) format */ 67*d881c474Schristos time_string = nd_format_time(time_buf, sizeof (time_buf), 68*d881c474Schristos "%Y-%m-%dT%H:%M:%SZ", gmtime(&seconds)); 69*d881c474Schristos } 70*d881c474Schristos ND_PRINT(" (%s)", time_string); 71*d881c474Schristos } 72*d881c474Schristos } 73