Index: openntpd-3.9p1/client.c =================================================================== --- openntpd-3.9p1.orig/client.c 2006-05-14 07:29:21.000000000 +0200 +++ openntpd-3.9p1/client.c 2006-09-11 10:12:20.000000000 +0200 @@ -321,7 +321,7 @@ priv_adjtime(); for (i = 0; i < OFFSET_ARRAY_SIZE; i++) - if (p->reply[i].rcvd <= p->reply[best].rcvd) + /* if (p->reply[i].rcvd <= p->reply[best].rcvd) */ p->reply[i].good = 0; return (0); Index: openntpd-3.9p1/configure.ac =================================================================== --- openntpd-3.9p1.orig/configure.ac 2006-05-14 07:29:23.000000000 +0200 +++ openntpd-3.9p1/configure.ac 2006-09-11 10:12:20.000000000 +0200 @@ -617,6 +617,11 @@ fi AC_SUBST(mansubdir) +AC_ARG_WITH(adjtimex, + [ --with-adjtimex Use adjtimex to adjust kernel skew], + [ AC_DEFINE(USE_ADJTIMEX, [], [Use adjust skew with adjtimex (experimental)]) ] +) + # Search for OpenSSL if required. if test "$ac_cv_func_arc4random" != "yes" && test "x$builtin_arc4random" != "xyes"; then saved_CPPFLAGS="$CPPFLAGS" Index: openntpd-3.9p1/defines.h =================================================================== --- openntpd-3.9p1.orig/defines.h 2006-05-14 07:29:21.000000000 +0200 +++ openntpd-3.9p1/defines.h 2006-09-11 10:12:20.000000000 +0200 @@ -20,6 +20,10 @@ # define setproctitle(x) #endif +#ifdef USE_ADJTIMEX +# define adjtime(a,b) (_compat_adjtime((a),(b))) +#endif + #if !defined(SA_LEN) # if defined(HAVE_STRUCT_SOCKADDR_SA_LEN) # define SA_LEN(x) ((x)->sa_len) Index: openntpd-3.9p1/openbsd-compat/Makefile.in =================================================================== --- openntpd-3.9p1.orig/openbsd-compat/Makefile.in 2006-05-14 07:29:19.000000000 +0200 +++ openntpd-3.9p1/openbsd-compat/Makefile.in 2006-09-11 10:12:56.000000000 +0200 @@ -9,7 +9,7 @@ COMPAT= atomicio.o bsd-arc4random.o bsd-misc.o bsd-poll.o \ bsd-snprintf.o bsd-getifaddrs.o bsd-setresuid.o \ bsd-setresgid.o fake-rfc2553.o -PORT= port-qnx.o +PORT= port-linux.o port-qnx.o VPATH=@srcdir@ CC=@CC@ Index: openntpd-3.9p1/openbsd-compat/openbsd-compat.h =================================================================== --- openntpd-3.9p1.orig/openbsd-compat/openbsd-compat.h 2006-05-14 07:29:19.000000000 +0200 +++ openntpd-3.9p1/openbsd-compat/openbsd-compat.h 2006-09-11 10:12:20.000000000 +0200 @@ -46,6 +46,11 @@ __attribute__((__format__ (printf, 2, 3))); #endif +#ifdef USE_ADJTIMEX +# include +int _compat_adjtime(const struct timeval *, struct timeval *); +#endif + #ifndef HAVE_INET_PTON int inet_pton(int, const char *, void *); #endif Index: openntpd-3.9p1/openbsd-compat/port-linux.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ openntpd-3.9p1/openbsd-compat/port-linux.c 2006-09-11 10:12:20.000000000 +0200 @@ -0,0 +1,105 @@ +/* $Id$ */ + +/* + * Copyright (c) 2004 Darren Tucker + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include "includes.h" + +#ifdef USE_ADJTIMEX +#include +#include +#ifdef adjtime +# undef adjtime +#endif + +#include "ntpd.h" + +/* scale factor used by adjtimex freq param. 1 ppm = 65536 */ +#define ADJTIMEX_FREQ_SCALE 65536 + +/* maximum change to skew per adjustment, in PPM */ +#define MAX_SKEW_DELTA 5.0 + +int +_compat_adjtime(const struct timeval *delta, struct timeval *olddelta) +{ + static struct timeval tlast = {0,0}; + static double tskew = 0; + static int synced = -1; + struct timeval tnow, tdelta; + double skew = 0, newskew, deltaskew, adjust, interval = 0; + struct timex tmx; + int result, saved_errno; + + gettimeofday(&tnow, NULL); + adjust = (double)delta->tv_sec; + adjust += (double)delta->tv_usec / 1000000; + + /* Even if the caller doesn't care about the olddelta, we do */ + if (olddelta == NULL) + olddelta = &tdelta; + + result = adjtime(delta, olddelta); + saved_errno = errno; + + if (olddelta->tv_sec == 0 && olddelta->tv_usec == 0 && + synced != INT_MAX) + synced++; + else + synced = 0; + + /* + * do skew calculations if we have synced + */ + if (synced == 0 ) { + tmx.modes = 0; + if (adjtimex(&tmx) == -1) + log_warn("adjtimex get failed"); + else + tskew = (double)tmx.freq / ADJTIMEX_FREQ_SCALE; + } else if (synced >= 1) { + interval = (double)(tnow.tv_sec - tlast.tv_sec); + interval += (double)(tnow.tv_usec - tlast.tv_usec) / 1000000; + + skew = (adjust * 1000000) / interval; + newskew = ((tskew * synced) + skew) / synced; + deltaskew = newskew - tskew; + + if (deltaskew > MAX_SKEW_DELTA) { + log_info("skew change %0.3lf exceeds limit", deltaskew); + tskew += MAX_SKEW_DELTA; + } else if (deltaskew < -MAX_SKEW_DELTA) { + log_info("skew change %0.3lf exceeds limit", deltaskew); + tskew -= MAX_SKEW_DELTA; + } else { + tskew = newskew; + } + + /* Adjust the kernel skew. */ + tmx.freq = (long)(tskew * ADJTIMEX_FREQ_SCALE); + tmx.modes = ADJ_FREQUENCY; + if (adjtimex(&tmx) == -1) + log_warn("adjtimex set freq failed"); + } + + log_debug("interval %0.3lf skew %0.3lf total skew %0.3lf", interval, + skew, tskew); + + tlast = tnow; + errno = saved_errno; + return result; +} +#endif