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/* $OpenBSD: util.c,v 1.27 2023/11/19 10:41:25 claudio Exp $ */
/*
* Copyright (c) 2004 Alexander Guy <alexander.guy@andern.org>
*
* 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 <fcntl.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include "ntpd.h"
double
gettime_corrected(void)
{
return (gettime() + getoffset());
}
double
getoffset(void)
{
struct timeval tv;
if (adjtime(NULL, &tv) == -1)
return (0.0);
return (tv.tv_sec + 1.0e-6 * tv.tv_usec);
}
double
gettime(void)
{
struct timeval tv;
if (gettimeofday(&tv, NULL) == -1)
fatal("gettimeofday");
return (gettime_from_timeval(&tv));
}
double
gettime_from_timeval(struct timeval *tv)
{
/*
* Account for overflow on OSes that have a 32-bit time_t.
*/
return ((uint64_t)tv->tv_sec + JAN_1970 + 1.0e-6 * tv->tv_usec);
}
time_t
getmonotime(void)
{
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
fatal("clock_gettime");
return (ts.tv_sec);
}
void
d_to_tv(double d, struct timeval *tv)
{
tv->tv_sec = d;
tv->tv_usec = (d - tv->tv_sec) * 1000000;
while (tv->tv_usec < 0) {
tv->tv_usec += 1000000;
tv->tv_sec -= 1;
}
}
double
lfp_to_d(struct l_fixedpt lfp)
{
double base, ret;
lfp.int_partl = ntohl(lfp.int_partl);
lfp.fractionl = ntohl(lfp.fractionl);
/* see comment in ntp.h */
base = NTP_ERA;
if (lfp.int_partl <= INT32_MAX)
base++;
ret = base * SECS_IN_ERA;
ret += (double)(lfp.int_partl) + ((double)lfp.fractionl / L_DENOMINATOR);
return (ret);
}
struct l_fixedpt
d_to_lfp(double d)
{
struct l_fixedpt lfp;
while (d > SECS_IN_ERA)
d -= SECS_IN_ERA;
lfp.int_partl = htonl((u_int32_t)d);
lfp.fractionl = htonl((u_int32_t)((d - (u_int32_t)d) * L_DENOMINATOR));
return (lfp);
}
double
sfp_to_d(struct s_fixedpt sfp)
{
double ret;
sfp.int_parts = ntohs(sfp.int_parts);
sfp.fractions = ntohs(sfp.fractions);
ret = (double)(sfp.int_parts) + ((double)sfp.fractions / S_DENOMINATOR);
return (ret);
}
struct s_fixedpt
d_to_sfp(double d)
{
struct s_fixedpt sfp;
sfp.int_parts = htons((u_int16_t)d);
sfp.fractions = htons((u_int16_t)((d - (u_int16_t)d) * S_DENOMINATOR));
return (sfp);
}
char *
print_rtable(int r)
{
static char b[11];
b[0] = 0;
if (r > 0)
snprintf(b, sizeof(b), "rtable %d", r);
return (b);
}
const char *
log_sockaddr(struct sockaddr *sa)
{
static char buf[NI_MAXHOST];
if (getnameinfo(sa, SA_LEN(sa), buf, sizeof(buf), NULL, 0,
NI_NUMERICHOST))
return ("(unknown)");
else
return (buf);
}
pid_t
start_child(char *pname, int cfd, int argc, char **argv)
{
char **nargv;
int nargc, i;
pid_t pid;
/* Prepare the child process new argv. */
nargv = calloc(argc + 3, sizeof(char *));
if (nargv == NULL)
fatal("%s: calloc", __func__);
/* Copy the program name first. */
nargc = 0;
nargv[nargc++] = argv[0];
/* Set the process name and copy the original args. */
nargv[nargc++] = "-P";
nargv[nargc++] = pname;
for (i = 1; i < argc; i++)
nargv[nargc++] = argv[i];
nargv[nargc] = NULL;
switch (pid = fork()) {
case -1:
fatal("%s: fork", __func__);
break;
case 0:
/* Prepare the parent socket and execute. */
if (cfd != PARENT_SOCK_FILENO) {
if (dup2(cfd, PARENT_SOCK_FILENO) == -1)
fatal("dup2");
} else if (fcntl(cfd, F_SETFD, 0) == -1)
fatal("fcntl");
execvp(argv[0], nargv);
fatal("%s: execvp", __func__);
break;
default:
/* Close child's socket end. */
close(cfd);
break;
}
free(nargv);
return (pid);
}
int
sanitize_argv(int *argc, char ***argv)
{
char **nargv;
int nargc;
int i;
/*
* We need at least three arguments:
* Example: '/usr/sbin/ntpd' '-P' 'foobar'.
*/
if (*argc < 3)
return (-1);
*argc -= 2;
/* Allocate new arguments vector and copy pointers. */
nargv = calloc((*argc) + 1, sizeof(char *));
if (nargv == NULL)
return (-1);
nargc = 0;
nargv[nargc++] = (*argv)[0];
for (i = 1; i < *argc; i++)
nargv[nargc++] = (*argv)[i + 2];
nargv[nargc] = NULL;
*argv = nargv;
return (0);
}
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