Useless trivia:
awk 'BEGIN { print
"\x1B\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
}' | \
nc -u -w 1 $NTP_SERVER 123 | od -t x1 -j 32 -N 4 | \
awk 'NR == 1 { bar = "0x" $2 $3 $4 $5; print strtonum(bar) - 2208988800 }'
will fetch the time (in seconds from 1 JAN 1970) from your NTP server, and
print it. Works swimmingly on the SVN version of busybox.
With GNU date, you can use this to set your system time (approximately) by
specifying the time in the '@SECONDS' format. Unfortunately, busybox date
doesn't recognize the '@SECONDS' format.
So I wrote a patch. (Constructive) criticism happily accepted. If
there's interest, I'll work up a patch to 'rdate' to directly set time
from a NTP server.
Index: busybox/coreutils/date.c
===================================================================
--- busybox/coreutils/date.c (revision 23413)
+++ busybox/coreutils/date.c (working copy)
@@ -146,6 +146,14 @@
end = '\0';
/* else end != NUL and we error out */
}
+ } else if (date_str[0] == '@') {
+ /* The format '@SECONDS' is a poorly-documented
GNU-ism. */
+ /* The 'SECONDS' counts from 1 Jan 1970 - just
like time_t. */
+ int seconds; /* Avoiding casting pointers */
+ if (sscanf(date_str, "@%d%c", &seconds, &end) <
1)
+
bb_error_msg_and_die(bb_msg_invalid_date, date_str);
+ tm = seconds;
+ memcpy(&tm_time, localtime(&tm),
sizeof(tm_time));
} else {
if (sscanf(date_str, "%2u%2u%2u%2u%u%c",
&tm_time.tm_mon,
&tm_time.tm_mday,
&tm_time.tm_hour, &tm_time.tm_min,
$ ./scripts/bloat-o-meter busybox_unstripped.old busybox_unstripped
function old new delta
date_main 1201 1282 +81
.rodata 120143 120144 +1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 82/0) Total: 82 bytes
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