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108 lines
2.6 KiB
Plaintext
108 lines
2.6 KiB
Plaintext
Name of the Application: xntp
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Version Number: 4.0.91
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Download Size: 4541953 bytes
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Downloaded from: http://www.eecis.udel.edu/~ntp/
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Operating Systems Supported: many
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Operating Systems Tested: unix
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Testing
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Dates tested (CPU clock set)
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1999-12-31
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2000-01-01
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2000-02-29
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Critical fragments of code tested with other dates by special
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algorithms.
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Hardware Platform: Sun Sparc
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OS: Solaris 2.6
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Compiler: gcc
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Version: 2.8.1
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Repairs: 9
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No. of files Repaired: 13
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Compilation of Patches Required: yes
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Results Description:
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1) Tested suspicious code.
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2) Repaired problem code and added documentation to ntp.h.
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3) Verified ntpd works on critical Y2K dates.
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Comments:
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1) Errors were found in improper use of tm_year within struct tm,
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calculations that did not support year 2000 as a leap year
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(it truly is, despite any unchanged comments remaining in
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the NTP source), and some incorrect date calculations, while
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not traditional Y2K errors, would break in the year 2000.
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2) include/ntpd.h
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Added some definitions and documentation about the right way
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of doing things. Definitions used by most, if not all, of
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the Y2K repairs.
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Cautions:
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1) Some of the Y2K repairs were to reference clock drivers that
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we did not have the local hardware to test. While I believe
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the changes are sound, they really need to be tested.
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This includes:
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refclock_arc.c
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refclock_heath.c
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refclock_hpgps.c
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Also, parseutil/dcfd.c is another hardware dependent module that
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was repaired without live testing.
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Non-Y2K Problems Observed:
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1) Inconsistent casts of variables containing time values may
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make expansion to 64 bit integer values in a portable manner
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difficult.
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2) libntp/caltontp.c:
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Has logic I believe will fail starting in year 2100 or so.
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Left unchanged/untested as it works well beyond basic NTP 2036
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limit checked by check_y2k.c.
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If NTP is implemented on 64-bit machines, this should be fixed
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3) ntpd/refclock_acts.c:
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ACTS time format has changed somewhat since the code was written.
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In particular the '*' '#' character switch no longer occurs...
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only '*' is typed.
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NOTE: Author (falsely) stated Y2K is NOT a leap year when it
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really is.
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TRUTH: ACTS will go beyond Y2K: it uses FourDigitYear % 100 values
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for year so year 2000 will revert to "00".
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4) ntpd/refclock_oncore.c
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Some very strange logic in manipulating year values:
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1122 instance->pp->year = buf[6]*256+buf[7];
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Multiply by 256????
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Response from PHK:
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The entire protocol is binary, the year is a 16 bit quantity
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which according to the manual can have the range 1998-2018.
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