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From malys...@cs.wmich.edu (Vladislav Malyshkin)
Subject Apache BUG
Date Mon, 15 Jul 1996 02:59:14 GMT


Hi, 
It seems that there is a bug in Apache 1.1 and probabry in 1.1.1
The problem is with the redirect made by cgi scripts.
For example I took the following CGI script
--------------------- FILE xred ------------
#!/bin/sh
umask 022
echo 'Location: http://www.apache.org'
echo
echo "$QUERY_STRING   $$" 1>>/tmp/mystat.txt
--------------------------------------------

and called it many times as follows
http://www.mydomain.edu/cgi-bin/xred?dd=FF&ggg=ccc&xx=XX.html
with some changes in the query string ^^^^^^^^^^^^^^^^^^^^^^^^^
for example call next time with 
http://www.mydomain.edu/cgi-bin/xred?dd=FF&gggAAA=BBBccc&xx=XX.html

and so on.
I did this 25 times, every time I changed something in 
the transmitted parameters. 

Then I compared records in the
/tmp/mystat.txt
and in the
..../httpd/logs/access_log

The problem is that what some requests that 
DO PRESENT in the ..../httpd/logs/access_log 
DO NOT PRESENT in the /tmp/mystat.txt

It looks like apache httpd don't call this CGI script every time
and use some old information CGI printed.
This occures (difference in /tmp/mystat.txt and ..../httpd/logs/access_log)
only if I am using NON-LOCAL  redirect. 
when I am using local redirect 
(Location: /mydir/myfile.gif) everything is OK. 
When I make a file output by CGI everything is OK as well.


I am using Solaris 2.4 and compiled apache by GCC 2.7.2 
I used apache 1.0 and 1.1  - everything is the same for these two 
versions. 

Sincerely,
Vladislav Malyshkin


-----------------------------------------------------
As an example I attached the part of access_log file 
where are 25 requests present and /tmp/mystat.txt file 
where JUST 11 REQUESTS of these 25 present.

----------- appendix -------- 
the part of access_log file  (25 requests)

n21.physics.wmich.edu - - [14/Jul/1996:22:44:37 -0400] "GET /cgi-bin/xred?FFFF=FFF&rr=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:44:44 -0400] "GET /cgi-bin/xred?FFFF=FFF&rr=GGFFFG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:44:54 -0400] "GET /cgi-bin/xred?FFFF=FFF&Frr=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:44:58 -0400] "GET /cgi-bin/xred?FFDDDFF=FFF&Frr=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:45:03 -0400] "GET /cgi-bin/xred?FFDDGG=FFF&Frr=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:45:08 -0400] "GET /cgi-bin/xred?FFDDGG=FDDDFF&Frr=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:45:12 -0400] "GET /cgi-bin/xred?FFDDGG=FDDDGGGHHHFF&Frr=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:45:17 -0400] "GET /cgi-bin/xred?FFDDGG=FDDDGKKHFF&Frr=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:45:21 -0400] "GET /cgi-bin/xred?FFDDGG=FDDDGKKHFF&FrLJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:45:25 -0400] "GET /cgi-bin/xred?FFDFDDGG=FDDDGKKHFF&FrLJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:45:31 -0400] "GET /cgi-bin/xred?FTYUYDFDDGG=FDDDGKKHFF&FrLJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:45:35 -0400] "GET /cgi-bin/xred?FTYUYHHHHGG=FDDDGKKHFF&FrLJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:45:44 -0400] "GET /cgi-bin/xred?FTAQDFQ4HHHGG=FDDDGKKHFF&FrLJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:45:49 -0400] "GET /cgi-bin/xred?FTAQDHHGG=F134252DDDGKKHFF&FrLJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:45:55 -0400] "GET /cgi-bin/xred?FTAQDHHGG=F13425wwDGKKHFF&FrLJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:45:58 -0400] "GET /cgi-bin/xred?FTAQDHHGG=F13425wwDGKwwwKHFF&FrLJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:46:05 -0400] "GET /cgi-bin/xred?FTAQDHHGG=F13HJKLWKJWwwwKHFF&FrLJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:46:09 -0400] "GET /cgi-bin/xred?FTAQDHHGG=F13HJKLWKwwwwJWwwwKHFF&FrLJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:46:27 -0400] "GET /cgi-bin/xred?FTAQDHHGG=F4F&FrLJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:46:36 -0400] "GET /cgi-bin/xred?FTAQDHHFFGG=F4F&FrLJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:46:40 -0400] "GET /cgi-bin/xred?FTAQDHHFFGG=F4F&FrLHJJ=GGG&xx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:46:44 -0400] "GET /cgi-bin/xred?FTAQDHHFFGG=F4F&FrLHJJ=GGG&Axx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:46:55 -0400] "GET /cgi-bin/xred?FTAQDHHFFGG=F4F&FrLHJJ=GGG&AFxx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:47:06 -0400] "GET /cgi-bin/xred?FTAQDHHFFGG=F4F&FrLHJJ=GGGDDDD&AFxx.html
HTTP/1.0" 302 -
n21.physics.wmich.edu - - [14/Jul/1996:22:47:13 -0400] "GET /cgi-bin/xred?FTAQDHHFFGG=F4F&FrLHJJ=GGGDDDD&YYxx.html
HTTP/1.0" 302 -


--------  the file /tmp/mystat.txt 11 requests -----------

FFFF=FFF&rr=GGG&xx.html   20938
FFFF=FFF&rr=GGFFFG&xx.html   20939
FFFF=FFF&Frr=GGG&xx.html   20940
FFDDGG=FFF&Frr=GGG&xx.html   20942
FFDDGG=FDDDFF&Frr=GGG&xx.html   20943
FFDDGG=FDDDGKKHFF&FrLJ=GGG&xx.html   20946
FTYUYHHHHGG=FDDDGKKHFF&FrLJ=GGG&xx.html   20949
FTAQDHHGG=F13HJKLWKJWwwwKHFF&FrLJ=GGG&xx.html   20955
FTAQDHHFFGG=F4F&FrLJ=GGG&xx.html   20960
FTAQDHHFFGG=F4F&FrLHJJ=GGG&xx.html   20961
FTAQDHHFFGG=F4F&FrLHJJ=GGGDDDD&YYxx.html   20967

----- End of forwarded message from Vladislav Malyshkin -----

-- 
Rob Hartill (robh@imdb.com)
The Internet Movie Database (IMDb)  http://www.imdb.com/
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