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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2009
*
* 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.
*
**********************************************************************
=======================================================================
Unix domain socket refclock driver.
*/
#include "config.h"
#include "sysincl.h"
#include "refclock.h"
#include "logging.h"
#include "util.h"
#include "sched.h"
#include "socket.h"
#define SOCK_MAGIC 0x534f434b
struct sock_sample {
/* Time of the measurement (system time) */
struct timeval tv;
/* Offset between the true time and the system time (in seconds) */
double offset;
/* Non-zero if the sample is from a PPS signal, i.e. another source
is needed to obtain seconds */
int pulse;
/* 0 - normal, 1 - insert leap second, 2 - delete leap second */
int leap;
/* Padding, ignored */
int _pad;
/* Protocol identifier (0x534f434b) */
int magic;
};
/* On 32-bit glibc-based systems enable conversion between timevals using
32-bit and 64-bit time_t to support SOCK clients compiled with different
time_t size than chrony */
#ifdef __GLIBC_PREREQ
#if __GLIBC_PREREQ(2, 34) && __TIMESIZE == 32
#define CONVERT_TIMEVAL 1
#if defined(_TIME_BITS) && _TIME_BITS == 64
typedef int32_t alt_time_t;
typedef int32_t alt_suseconds_t;
#else
typedef int64_t alt_time_t;
typedef int64_t alt_suseconds_t;
#endif
struct alt_timeval {
alt_time_t tv_sec;
alt_suseconds_t tv_usec;
};
#endif
#endif
static void read_sample(int sockfd, int event, void *anything)
{
char buf[sizeof (struct sock_sample) + 16];
struct timespec sys_ts, ref_ts;
struct sock_sample sample;
RCL_Instance instance;
int s;
instance = (RCL_Instance)anything;
s = recv(sockfd, buf, sizeof (buf), 0);
if (s < 0) {
DEBUG_LOG("Could not read SOCK sample : %s", strerror(errno));
return;
}
if (s == sizeof (sample)) {
memcpy(&sample, buf, sizeof (sample));
#ifdef CONVERT_TIMEVAL
} else if (s == sizeof (sample) - sizeof (struct timeval) + sizeof (struct alt_timeval)) {
struct alt_timeval atv;
memcpy(&atv, buf, sizeof (atv));
#ifndef HAVE_LONG_TIME_T
if (atv.tv_sec > INT32_MAX || atv.tv_sec < INT32_MIN ||
atv.tv_usec > INT32_MAX || atv.tv_usec < INT32_MIN) {
DEBUG_LOG("Could not convert 64-bit timeval");
return;
}
#endif
sample.tv.tv_sec = atv.tv_sec;
sample.tv.tv_usec = atv.tv_usec;
DEBUG_LOG("Converted %d-bit timeval", 8 * (int)sizeof (alt_time_t));
memcpy((char *)&sample + sizeof (struct timeval), buf + sizeof (struct alt_timeval),
sizeof (sample) - sizeof (struct timeval));
#endif
} else {
DEBUG_LOG("Unexpected length of SOCK sample : %d != %ld",
s, (long)sizeof (sample));
return;
}
if (sample.magic != SOCK_MAGIC) {
DEBUG_LOG("Unexpected magic number in SOCK sample : %x != %x",
(unsigned int)sample.magic, (unsigned int)SOCK_MAGIC);
return;
}
UTI_TimevalToTimespec(&sample.tv, &sys_ts);
UTI_NormaliseTimespec(&sys_ts);
if (!UTI_IsTimeOffsetSane(&sys_ts, sample.offset))
return;
UTI_AddDoubleToTimespec(&sys_ts, sample.offset, &ref_ts);
if (sample.pulse) {
RCL_AddPulse(instance, &sys_ts, sample.offset);
} else {
RCL_AddSample(instance, &sys_ts, &ref_ts, sample.leap);
}
}
static int sock_initialise(RCL_Instance instance)
{
int sockfd;
char *path;
RCL_CheckDriverOptions(instance, NULL);
path = RCL_GetDriverParameter(instance);
sockfd = SCK_OpenUnixDatagramSocket(NULL, path, 0);
if (sockfd < 0)
LOG_FATAL("Could not open socket %s", path);
RCL_SetDriverData(instance, (void *)(long)sockfd);
SCH_AddFileHandler(sockfd, SCH_FILE_INPUT, read_sample, instance);
return 1;
}
static void sock_finalise(RCL_Instance instance)
{
int sockfd;
sockfd = (long)RCL_GetDriverData(instance);
SCH_RemoveFileHandler(sockfd);
SCK_RemoveSocket(sockfd);
SCK_CloseSocket(sockfd);
}
RefclockDriver RCL_SOCK_driver = {
sock_initialise,
sock_finalise,
NULL
};
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