Subject:
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Re: Y2K problem with lugnet! (was Re: Help! My newsreader's downloading everything on lugnet!)
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Newsgroups:
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lugnet.admin.general
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Date:
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Sat, 1 Jan 2000 23:30:33 GMT
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Viewed:
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844 times
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In lugnet.admin.general, mattdm@mattdm.org (Matthew Miller) writes:
> Are you using INN? I know that the newest version (2.2.something) was
> released to be a fix for a _different_ problem with the NEWNEWS and
> NEWGROUPS commands. If I remember right, 1.6 is the oldest version that
> works. If you are running INN, it's 1.5.12.2, yeah? :)
No -- it's using C News, because it's got a much smaller memory footprint
than INN and is better suited to serving large numbers of simultaneous NNTP
connections to small numbers of groups (groups in the hundreds rather than
tens of thousands). So far it's been a great choice. Plus, a large part of
CNews is shell scripts, making it much easier to interface with custom
add-on components.
Anyway, I think the problem lies in a function called dtol() in the NNTP
Reference Implementation of the nntpd daemon. Here's how it goes (with the
"#if DEBUG" directives removed in this cut & paste for readability)...
------------------------------------begin-------------------------------------
/*
* dtol -- convert date to long integer. This is not implicitly
* local time, or any other kind of time, for that matter. If you
* pass it a date you think is GMT, you wind up with that number of
* seconds...
*
* Parameters: "date_ascii" is in the form "yymmddhhmmss".
*
* Returns: Long integer containing number
* of seconds since 000000 Jan 1, 1970,
* and "date". -1 on error.
*
* Side effects: None.
*/
#define twodigtoi(x) (((x[0]) - '0') + (x[1] - '0')*10)
#define dysize(y) ((y % 4 ? 365 : 366))
static int dmsize[12] =
{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
long
dtol(date_ascii)
char *date_ascii;
{
char date[32], *date_str;
char *lhs, *rhs;
char temp;
long seconds;
int year, month, day, hour, mins, secs;
int len, i;
len = strlen(date_ascii);
if (len != sizeof("yymmddhhmmss")-1)
return (-1);
(void) strcpy(date, date_ascii);
date_str = date;
rhs = date_str + len - 1;
lhs = date_str;
for (; lhs < rhs; ++lhs, --rhs) {
temp = *lhs;
*lhs = *rhs;
*rhs = temp;
if (!isdigit(temp) || !isdigit(*lhs))
return (-1);
}
lhs = date_str;
secs = twodigtoi(lhs);
lhs += 2;
mins = twodigtoi(lhs);
lhs += 2;
hour = twodigtoi(lhs);
lhs += 2;
day = twodigtoi(lhs);
lhs += 2;
month = twodigtoi(lhs);
lhs += 2;
year = twodigtoi(lhs);
if (month < 1 || month > 12 ||
day < 1 || day > 31 ||
mins < 0 || mins > 59 ||
secs < 0 || secs > 59)
return (-1);
if (hour == 24) {
hour = 0;
day++;
}
if (hour < 0 || hour > 23)
return (-1);
seconds = 0;
year += 1900;
for (i = 1970; i < year; i++)
seconds += dysize(i);
/* Leap year */
if (dysize(year) == 366 && month >= 3)
seconds++;
while (--month)
seconds += dmsize[month-1];
seconds += day-1;
seconds = 24 * seconds + hour;
seconds = 60 * seconds + mins;
seconds = 60 * seconds + secs;
return (seconds);
}
-------------------------------------end--------------------------------------
Ideally, there should at least have been
if (year < 1970)
return (-1);
after the
year += 1900;
but oh well.
To fix this, I'm thinking of changing the single line
year += 1900;
to
year += (year >= 70) ? 1900 : 2000; /* Y2K bug workaround */
And the 'for' loop after that should still work fine, since 'year' will be
set to 2000 after being initially 0.
However, it's also possible that dysize() has a bug, depending on whether or
not 2000 is a leap year (I can never remember).
Here's dysize()...
------------------------------------begin-------------------------------------
#define dysize(y) ((y % 4 ? 365 : 366))
-------------------------------------end--------------------------------------
According to 'cal', 2000 *is* a leap year, so it would appear that dysize()
is correct until 2100 (which I think isn't a leap year, right?).
I wonder why Free Agent works OK with this newsserver? It must be using
XOVER or something instead of NEWNEWS...
--Todd
p.s. That whole string-reversing and twodigtoi() bit there is a little
frightening, eh...?
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