inexplicable PHP behaviour(!?)

i have a snippit of PHP code which refuses to do the biz and i cannot for the life of me see why...
there is a simple (bespoke) binary ('mybin') which has 755 permissions and which maps an input string to stdout, eg:  %  echo "my_string" | mybin > outfile  ... which works fine as a shell cmd...

now in my php script i coded both:
     exec("echo $string_var | mybin > outfile");
and
     exec("cat text.file | mybin > outfile");
... but each of these produce empty output files... i have plenty other 'exec's in my script which are fine... the darn' thing just seems to want to ignore 'mybin' (which was built on the host m/c)... i even tried restarting the apache httpds...  ...no comprendo...  


 

shallxrgAsked:
Who is Participating?
 
RurneConnect With a Mentor Commented:
Where is 'mybin' saved at?  If you have anything like open_basedir or include_path in play and mybin is not in your DocumentRoot, you may simply not be able to see where the program is.
0
 
afzzCommented:
Instead of exec try the following if it works. Also try putting the full path to echo & cat like /bin/cat
`echo $string_var | mybin > outfile`;
`cat text.file | mybin > outfile`;

Open in new window

0
 
shallxrgAuthor Commented:
thanks rurne... but see the comment i added for general view
cheers
roger
0
Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

 
shallxrgAuthor Commented:
rurne's solution was 'correct'... i moved 'mybin' from '/bin' to the docroot directory, and bingo... however, i cannot understand why the shell() and backtick commands can cheerfully invoke other executable binaries from /bin (eg gunzip) and yet not the bespoke binary 'mybin' .... permissions were ok ... still don't understand!
0
 
shallxrgAuthor Commented:
this is quite possibly a nugget of info... i just discovered that the PHP shell() command WILL run my executable from /bin but ONLY if the binary is stripped(!!?!!)... (it will run it from the docroot directory whether or not it is stripped)

i simply did :  strip -s '/bin/mybin' and off she went....

WEIRD!
0
 
shallxrgAuthor Commented:
cancel that last post... i think i just got confused
0
 
RurneCommented:
I'd highly recommend checking your Apache configuration for any open_basedir or include_path directives.  Alternatively, you could be running in safe mode, which is not recommended (and deprecated in current versions of PHP for its bugginess).  That would be why you could access something from the command line and not from CGI or ISAPI mode.

HTH.
0
 
shallxrgAuthor Commented:
check.... thanks for the tip... i'll do that next i'm back in the office... today is saturday and SUNNY :-)
0
All Courses

From novice to tech pro — start learning today.