1 files changed, 154 insertions, 0 deletions
diff --git a/sys_netbsd.c b/sys_netbsd.c
new file mode 100644
index 0000000..840d6a5
--- /dev/null
+++ b/sys_netbsd.c
@@ -0,0 +1,154 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Richard P. Curnow  1997-2001
+ * Copyright (C) J. Hannken-Illjes  2001
+ * Copyright (C) Miroslav Lichvar  2015
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ * 
+ **********************************************************************
+
+  =======================================================================
+
+  Driver file for the NetBSD and FreeBSD operating system.
+  */
+
+#include "config.h"
+
+#include "sysincl.h"
+
+#include "sys_netbsd.h"
+#include "sys_timex.h"
+#include "logging.h"
+#include "privops.h"
+#include "util.h"
+
+/* Maximum frequency offset accepted by the kernel (in ppm) */
+#define MAX_FREQ 500.0
+
+/* Minimum assumed rate at which the kernel updates the clock frequency */
+#define MIN_TICK_RATE 100
+
+/* Interval between kernel updates of the adjtime() offset */
+#define ADJTIME_UPDATE_INTERVAL 1.0
+
+/* Maximum adjtime() slew rate (in ppm) */
+#define MAX_ADJTIME_SLEWRATE 5000.0
+
+/* Minimum offset adjtime() slews faster than MAX_FREQ */
+#define MIN_FASTSLEW_OFFSET 1.0
+
+/* ================================================== */
+
+/* Positive offset means system clock is fast of true time, therefore
+   slew backwards */
+
+static void
+accrue_offset(double offset, double corr_rate)
+{
+  struct timeval newadj, oldadj;
+  double doldadj;
+
+  UTI_DoubleToTimeval(-offset, &newadj);
+
+  if (PRV_AdjustTime(&newadj, &oldadj) < 0)
+    LOG_FATAL("adjtime() failed");
+
+  /* Add the old remaining adjustment if not zero */
+  doldadj = UTI_TimevalToDouble(&oldadj);
+  if (doldadj != 0.0) {
+    UTI_DoubleToTimeval(-offset + doldadj, &newadj);
+    if (PRV_AdjustTime(&newadj, NULL) < 0)
+      LOG_FATAL("adjtime() failed");
+  }
+}
+
+/* ================================================== */
+
+static void
+get_offset_correction(struct timespec *raw,
+                      double *corr, double *err)
+{
+  struct timeval remadj;
+  double adjustment_remaining;
+#ifdef MACOSX
+  struct timeval tv = {0, 0};
+
+  if (PRV_AdjustTime(&tv, &remadj) < 0)
+    LOG_FATAL("adjtime() failed");
+
+  if (PRV_AdjustTime(&remadj, NULL) < 0)
+    LOG_FATAL("adjtime() failed");
+#else
+  if (PRV_AdjustTime(NULL, &remadj) < 0)
+    LOG_FATAL("adjtime() failed");
+#endif
+
+  adjustment_remaining = UTI_TimevalToDouble(&remadj);
+
+  *corr = adjustment_remaining;
+  if (err) {
+    if (*corr != 0.0)
+      *err = 1.0e-6 * MAX_ADJTIME_SLEWRATE / ADJTIME_UPDATE_INTERVAL;
+    else
+      *err = 0.0;
+  }
+}
+
+/* ================================================== */
+
+void
+SYS_NetBSD_Initialise(void)
+{
+  SYS_Timex_InitialiseWithFunctions(MAX_FREQ, 1.0 / MIN_TICK_RATE,
+                                    NULL, NULL, NULL,
+                                    MIN_FASTSLEW_OFFSET, MAX_ADJTIME_SLEWRATE,
+                                    accrue_offset, get_offset_correction);
+}
+
+/* ================================================== */
+
+void
+SYS_NetBSD_Finalise(void)
+{
+  SYS_Timex_Finalise();
+}
+
+/* ================================================== */
+
+#ifdef FEAT_PRIVDROP
+void
+SYS_NetBSD_DropRoot(uid_t uid, gid_t gid)
+{
+#ifdef NETBSD
+  int fd;
+#endif
+
+  /* On NetBSD the helper is used only for socket binding, but on FreeBSD
+     it's used also for setting and adjusting the system clock */
+  PRV_StartHelper();
+
+  UTI_DropRoot(uid, gid);
+
+#ifdef NETBSD
+  /* Check if we have write access to /dev/clockctl */
+  fd = open("/dev/clockctl", O_WRONLY);
+  if (fd < 0)
+    LOG_FATAL("Can't write to /dev/clockctl");
+  close(fd);
+#endif
+}
+#endif