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Create hwclock_sync.c
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‎hwclock_sync.c‎

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#include <stdio.h>
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#include <time.h>
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#include <stdlib.h>
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#include <string.h>
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#include <linux/rtc.h>
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//check hardware clock and sys clock
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//check if ntpdate -d will be a better fix command. then hwclock or date -s
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//issue 1 what happens if the system time is completely wrong?
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//check ntp status on old servers and chronyd on new.
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int main() {
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int hour[50], fixthis=0, htime , stime, n=0 , i;
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char clean1[100] , precheck1[100];
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//clean existing temp file
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FILE *prep = popen("rm -rf /var/tmp/check_clock.txt", "r");
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// check hardware clock and add stdout to array
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// change verbose to debug for older systems
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FILE *ls = popen("/usr/sbin/hwclock --debug | grep read", "r");
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char buf[256];
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while (fgets(buf, sizeof(buf), ls) != 0) {
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//printf("System Time : %s", buf);
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for (i=0; i < 52; i++) {
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// printf("%c", buf[i]);
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hour[n] = buf[i];
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n = n + 1;
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}
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}
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pclose(ls);
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// validate is ntp or chronyd is running .
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// need to fix this to check ntpd instead
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FILE *pre1 = popen("/etc/init.d/ntpd status ", "r");
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while (fgets(precheck1, sizeof(precheck1), ls) != 0) {
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// printf("NTP is: %c%c%c%c%c%c%c\n", precheck1[20],precheck1[21],precheck1[22],precheck1[23],precheck1[24],precheck1[25],precheck1[26]);
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char precheck2[50];
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int live = snprintf(precheck2, sizeof(precheck2), "NTP is: %c%c%c%c%c%c%c", precheck1[20],precheck1[21],precheck1[22],precheck1[23],precheck1[24],precheck1[25],precheck1[26]);
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// compare the output string
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char out2[50];
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char out3[50];
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int rel;
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strcpy(out2, "NTP is: running");
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strcpy(out3, "running");
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rel = strcmp(out2, precheck2);
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if (rel == 0) {
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printf("NTP is running. %d\n", rel);
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}
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}
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pclose(pre1);
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FILE *pre2 = popen("/etc/init.d/ntpd status ", "r");
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while (fgets(precheck1, sizeof(precheck1), ls) != 0) {
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// printf("NTP is: %c%c%c%c%c%c%c\n", precheck1[8],precheck1[9],precheck1[10],precheck1[11],precheck1[12], \
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precheck1[13],precheck1[14]);
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char precheck2[50];
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int live = snprintf(precheck2, sizeof(precheck2), "NTP is in a %c%c%c%c%c%c%c state", precheck1[8],precheck1[9],precheck1[10],precheck1[11],precheck1[12], \
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precheck1[13],precheck1[14]);
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// compare the output string
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char out2[50];
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char out3[50];
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int rel;
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strcpy(out2, "NTP is in a stopped state");
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strcpy(out3, "running");
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rel = strcmp(out2, precheck2);
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if (rel == 0) {
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printf("NTP is not running.Terminating application %d\n", rel);
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fixthis = fixthis + 1;
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}
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}
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pclose(pre2);
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if (fixthis == 1) {
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FILE *auto_15 = popen("/usr/sbin/ntpd ", "r");
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pclose(auto_15);
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exit(0);
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}
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//for testing only.
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//printf("Testing Sysclock with Char %c%c%c%c\n" , hour[42],hour[43],hour[45],hour[46]);
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//converting char to int
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int r = hour[42] - '0';
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int x = hour[43] - '0';
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int y = hour[45] - '0';
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int z = hour[46] - '0';
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//putting the int together . printing htime is for debugging only
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htime= r * 1000 + x * 100 + y * 10 + z;
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int htimeH = r * 10 + x;
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int htimeM = y * 10 + z;
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//printf("%i\n", htimeM);
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//start comparision to os clock
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FILE *os_time = popen("date -u +%H%M", "r");
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char buf1[256];
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while (fgets(buf1, sizeof(buf1), os_time) != 0) {
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//print char fro array- not needed unless debugging
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//printf("OS Time : %s", buf1);
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}
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pclose(os_time);
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int a = buf1[0] - '0';
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int b = buf1[1] - '0';
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int c = buf1[2] - '0';
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int d = buf1[3] - '0';
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stime= a * 1000 + b * 100 + c * 10 + d;
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int stimeH = a * 10 + b;
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int stimeM = c * 10 + d;
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//printf("%i",stimeM);
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if (htime == stime) {
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printf("%s", "The SYS clock and HWclock are in sync\n");
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}
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else if (stime != htime) {
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printf("%s" , "The OS and HW clocks are not in sync.The sync is within the threshold\n");
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//consider removing this check
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// if (htimeH != stimeH) {
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// printf("%s", "The hour is off and needed to be fixed. \n");
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// FILE *temp = popen("touch /var/tmp/fixclock.txt" , "r");
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// }
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// if the hardware clock is higher. how do we verify if the clock is correct
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if (htimeM > stimeM) {
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int timeD = htimeM - stimeM;
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//need time offset if the system time is not utc
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int timeF = htimeH - 4;
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if (timeD > 10) {
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printf("%s%i%s", "The hwCLOCK ahead of the sysclock by ", timeD , " minutes.Self correcting\n");
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int fix1 = snprintf(clean1, sizeof(clean1), "hwclock --systohc");
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FILE *FIX2 = popen(clean1, "r");
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FILE *temp = popen("touch /var/tmp/check_clock.txt" , "r");
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FILE *temp2 = popen("echo $(date) The clock was off by more then 10 minutes >> /var/tmp/clock.log" , "r");
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}
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}
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// possible patch for minutes in the 50 range (if htimeM < 50 && htimeM < stimeM)
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// original line (htimeM < stimeM)
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else if (htimeM < stimeM) {
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int timeD = stimeM - htimeM;
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int timeF = htimeH - 4;
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if (timeD > 10) {
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printf("%s%i%s", "The HWCLOCK behind the sysclock by ", timeD , " minutes.Self Correcting\n");
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// int fix1 = snprintf(clean1, sizeof(clean1), "date -s \"%d:%d\"",htimeH,htimeM);
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int fix1 = snprintf(clean1, sizeof(clean1), "hwclock --systohc");
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FILE *FIX2 = popen(clean1, "r");
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FILE *temp = popen("touch /var/tmp/check_clock.txt" , "r");
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FILE *temp2 = popen("echo $(date) The clock was off by more then 10 minutes >> /var/tmp/clock.log" , "r");
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}
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}
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}
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}

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