bug#18176: 24.4.50; Errors on dates far in the future in url.el

bug#18176: 24.4.50; Errors on dates far in the future in url.el

[Lars Magne Ingebrigtsen]

Debugger entered--Lisp error: (error "Invalid date: 31-Dec-9999 23:59:59.00 GMT")
  signal(error ("Invalid date: 31-Dec-9999 23:59:59.00 GMT"))
  error("Invalid date: %s" "31-Dec-9999 23:59:59.00 GMT")
  (condition-case nil (apply (quote encode-time) (parse-time-string (timezone-make-date-arpa-standard date))) (error (error "Invalid date: %s" date)))
  (condition-case nil (apply (quote encode-time) (parse-time-string date)) (error (condition-case nil (apply (quote encode-time) (parse-time-string (timezone-make-date-arpa-standard date))) (error (error "Invalid date: %s" date)))))
  date-to-time("31-Dec-9999 23:59:59.00 GMT")
  url-cookie-expired-p([url-cookie "CheezySplits" "SplitTestingPID=dba40051-b06e-49f7-ad9f-5e53725c60e6" "31-Dec-9999 23:59:59.00 GMT" "/" ".cheezburger.com" nil])
  url-cookie-retrieve("cheezburger.com" "/8273908992?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ICanHasCheezburger+%28I+CAN+HAS+CHEEZBURGER%29" nil)
  url-cookie-generate-header-lines("cheezburger.com" "/8273908992?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ICanHasCheezburger+%28I+CAN+HAS+CHEEZBURGER%29" nil)
  url-http-create-request()
  byte-code("\301\b\302 \"\207" [proc process-send-string url-http-create-request] 3)
  url-http-async-sentinel(#<process cheezburger.com<4>> "open\n")

The url-cookie function should either ignore invalid dates, or
date-to-time should understand dates after 2037.  Or both.  Which would
be best.



In GNU Emacs 24.4.50.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw scroll bars)
 of 2014-06-09 on stories
Repository revision: 117291 rgm@gnu.org-20140608234143-lxs3ijcc3exkcomq
Windowing system distributor `Fedora Project', version 11.0.11404000
System Description:	Debian GNU/Linux 7.0 (wheezy)

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GSETTINGS NOTIFY GNUTLS
LIBXML2 FREETYPE LIBOTF XFT ZLIB

Important settings:
  value of $LANG: en_US
  locale-coding-system: iso-latin-1-unix

Major mode: Article

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t

Recent input:
u u <down-mouse-1> <mouse-movement> <mouse-1> <help-echo> 
q s <down-mouse-1> <mouse-1> g <up> <up> <up> <up> 
<up> s <down-mouse-1> <mouse-1> g <next> <up> <down> 
<down> <down> <down> <down> <down> <down> <down> <up> 
<return> <return> h h h q <return> <return> q l <return> 
<return> SPC q l s <down> <return> <return> h h q <return> 
<return> n n q l s . s <down-mouse-1> <mouse-1> g <down-mouse-1> 
<mouse-1> g g g g g <down-mouse-1> <mouse-1> g <down-mouse-1> 
<mouse-1> g <down-mouse-1> <mouse-movement> <mouse-1> 
g <down-mouse-1> <mouse-1> g s <down-mouse-1> <mouse-1> 
g <down-mouse-1> <mouse-1> g <down-mouse-1> <mouse-movement> 
<mouse-1> g <down-mouse-1> <mouse-1> g <down-mouse-1> 
<mouse-1> g <down-mouse-1> <mouse-1> g . <return> d 
q <next> <down> <down> <down> <down> <down> <down> 
<down> <down> <up> <return> <return> q <up> <up> <return> 
<return> h M-> <up> <up> <up> u u <down-mouse-1> <mouse-1> 
<up> <up> <up> w w M-: 9 s t <backspace> <backspace> 
<backspace> ( s e t q SPC d e b u g - o n - e r r o 
r SPC t ) <return> w q C-x C-f C-a C-k ~ / m g <tab> 
l i <tab> <return> M-x g r e p <return> c o o k i e 
SPC * . e l <return> C-x o <down> <down> <down> <down> 
C-e <left> C-x C-e q <next> <prior> q H-o H-o C-x b 
<return> w <down-mouse-1> <mouse-movement> <mouse-1> 
h u SPC SPC n q SPC q SPC q n n n SPC h M-> <up> <up> 
<up> u q <down-mouse-1> <mouse-movement> <mouse-1> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <down> <down> <return> <return> h h h M-> <up> 
<up> <up> <return> <down> <down> <down> <down> <down> 
C-a C-SPC <down> <down> M-w M-< M-> M-w q M-x r e p 
o <tab> r <tab> b <tab> <return>

Recent messages:
Mark set
Copied http://liartownusa.tumblr.com/post/93615083800
No more unseen articles
No more unread articles
Mark set
Contacting host: feedproxy.google.com:80
Entering debugger...
Mark set [3 times]
Back to top level.
Making completion list...

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/home/larsi/mgnus/lisp/gnus-uu hides /home/larsi/src/emacs/trunk/lisp/gnus/gnus-uu
/home/larsi/mgnus/lisp/deuglify hides /home/larsi/src/emacs/trunk/lisp/gnus/deuglify
/home/larsi/mgnus/lisp/spam-stat hides /home/larsi/src/emacs/trunk/lisp/gnus/spam-stat
/home/larsi/mgnus/lisp/nndir hides /home/larsi/src/emacs/trunk/lisp/gnus/nndir
/home/larsi/mgnus/lisp/gnus-kill hides /home/larsi/src/emacs/trunk/lisp/gnus/gnus-kill
/home/larsi/mgnus/lisp/gnus-ems hides /home/larsi/src/emacs/trunk/lisp/gnus/gnus-ems
/home/larsi/mgnus/lisp/gnus-group hides /home/larsi/src/emacs/trunk/lisp/gnus/gnus-group
/home/larsi/mgnus/lisp/nnagent hides /home/larsi/src/emacs/trunk/lisp/gnus/nnagent
/home/larsi/mgnus/lisp/sieve-mode hides /home/larsi/src/emacs/trunk/lisp/gnus/sieve-mode
/home/larsi/mgnus/lisp/rfc2047 hides /home/larsi/src/emacs/trunk/lisp/gnus/rfc2047
/home/larsi/mgnus/lisp/gmm-utils hides /home/larsi/src/emacs/trunk/lisp/gnus/gmm-utils
/home/larsi/mgnus/lisp/utf7 hides /home/larsi/src/emacs/trunk/lisp/gnus/utf7
/home/larsi/mgnus/lisp/nnimap hides /home/larsi/src/emacs/trunk/lisp/gnus/nnimap
/home/larsi/mgnus/lisp/mm-decode hides /home/larsi/src/emacs/trunk/lisp/gnus/mm-decode
/home/larsi/mgnus/lisp/time-date hides /home/larsi/src/emacs/trunk/lisp/calendar/time-date
/home/larsi/mgnus/lisp/parse-time hides /home/larsi/src/emacs/trunk/lisp/calendar/parse-time

Features:
(shadow hashcash ecomplete emacsbug sendmail shell grep compile
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custom widget hashtable-print-readable backquote make-network-process
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Memory information:
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-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#18176: 24.4.50; Errors on dates far in the future in url.el

[Glenn Morris]

Lars Magne Ingebrigtsen wrote:

>   date-to-time("31-Dec-9999 23:59:59.00 GMT")
[...]
> date-to-time should understand dates after 2037. 

I think it's actually 4038, due to this element of parse-time-rules:

((5) (100 4038))

Simply change that to

((5) (100 9999))

and it seems to work; but I did not check if that breaks anything else.

bug#18176: 24.4.50; Errors on dates far in the future in url.el

[Glenn Morris]

Lars Magne Ingebrigtsen wrote:

> The url-cookie function should either ignore invalid dates,

What do you want url-cookie-expired-p to return when a cookie has an
expiry date that it cannot parse? t or nil?

bug#18176: 24.4.50; Errors on dates far in the future in url.el

[Paul Eggert]

That "4038" started out as a "2038" (the year 32-bit signed time_t's 
will roll around) and then someone added 2000 seemingly at random.  We 
might as well bump it to most-positive-fixnum.

However, this won't work on hosts with 32-bit time_t, because the 
low-level primitives can't go past 2038.  (Even on 64-bit hosts it won't 
work for time stamps in the very far future.)  So url-cookie-expired-p 
needs to take greater care here.

Fixing this uncovered a couple of other problems.  First, date-to-time 
shouldn't fall back on timezone-make-date-arpa-standard if encode-time 
says the date is out of range.  Second, the low-level primitives don't 
consistently call time_overflow when there's a time overflow.

This particular use case suggests that url-cookie-expired-p should treat 
out-of-range expiration dates as being infinite.

I installed a patch to do all the above, as trunk bzr 117637.  I suppose 
we could get fancier by distinguishing negative from positive time 
overflow, and/or by creating error symbols for time overflow flavors, 
but this patch should be enough to fix the current bug.

bug#18176: closed (Re: 24.4.50; Errors on dates far in the future in url.el)

[Lars Magne Ingebrigtsen]

help-debbugs@gnu.org (GNU bug Tracking System) writes:

> This particular use case suggests that url-cookie-expired-p should
> treat out-of-range expiration dates as being infinite.

Yeah, that seems like the right solution.  If we can't parse the
expiration date, we should treat it as if the expiration date isn't
present, and that's the effect we get here, if I understand the code
correctly.  (Which I may not do; I just skimmed it very quickly.)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no