Hello,
I've trying to parse 8 byte field with f.time = ProtoField.absolute_time("X.TimeStamp","TimeStamp", base.UTC).
Calling the field with subtree:add(f.time, buffer(0,8)) I'm getting year 2005 instead of 2020.
Any suggestion what I'm doing wrong?
UTC since 1/1/1970, IEEE double precision floating point. Intel format
So that's a little-endian floating-point not-necessarily-integral number of seconds since the UN*X Epoch?
If so, then the answer to
So which, if any, of the encodings listed at https://gitlab.com/wireshark/wireshar... is applicable?
is "none".
You will need to fetch the floating-point value directly into a numerical value, calculate the integral part (seconds) and fractional part (as nanoseconds), construct a new NSTime from those two values, and add that to the protocol tree using subtree:add(f.time, buffer(0,8), {that value}).
I don't need to use the add_le. How do I know? defining f.time = ProtoField.double(...) provides me the same number as in Frame's Epoch Time.
Now, when I'm using
local usecs = buffer(0,8):uint64()
local secs = (usecs / 1000000):tonumber()
local nsecs = (usecs % 1000000):tonumber() * 1000
subtree:add(pl_timestamp, buffer(0,8), NSTime.new(secs, nsecs))
and getting TimeStamp: Not represantable
@BMWE Normally we don't close questions, simply accept the correct answer by clicking the checkmark next to it, although that's a little complicated as @Guy Harris has described the method and I've described an implementation.
Asked: 2020-09-06 06:14:52 +0000
Seen: 1,419 times
Last updated: Sep 06 '20
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In what fashion is the time encoded in that 8-byte field? 4-byte seconds since January 1, 1970, 00:00:00 UTC, followed by 4-byte microseconds, both big-endian? 4-byte seconds since January 1, 1970, 00:00:00 UTC, followed by 4-byte microseconds, both little-endian? 4-byte seconds since January 1, 1970, 00:00:00 UTC, followed by 4-byte nanoseconds, both big-endian? 4-byte seconds since January 1, 1970, 00:00:00 UTC, followed by 4-byte nanoseconds, both little-endian? Or something else?
UTC since 1/1/1970, IEEE double precision floating point. Intel format. 8 Bytes field
So which, if any, of the encodings listed at https://gitlab.com/wireshark/wireshar... is applicable?
And by Intel format., I take it that you mean Little-Endian format then? Assuming so, at the very least you should use
subtree:add_le(f.time, buffer(0,8)).Ref: 11.7.2.1. treeitem:add_le([protofield], [tvbrange], [value], [label])
https://www.wireshark.org/docs/wsdg_h...