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Full Discussion: Critical lib renamed
Top Forums UNIX for Advanced & Expert Users Critical lib renamed Post 302460858 by methyl on Thursday 7th of October 2010 07:39:11 PM
Old 10-07-2010
@jlliagre
This is verifiable fact.
Quote:
bash (but not ksh) has a character-by-character raw read feature (read -r -n1).

The O/P states that bash is still working. I picked up the bash "read" idea from the IBM website after googling the library filename (which we finally got accurately in post #15). Found a thread where they were responding to someone in a similar situation. Renaming this library is a technique to get certain software such as Apache running on AIX when a replacement library is installed further down the library search path. However you have to do things in precisely the right order or you are in a mess.
Unfortunately the promising thread petered out when that O/P rebooted the computer and an unrelated can of worms opened due to having two system discs at different releases of AIX with the wrong one as the default boot.

I picked on "ftp" and "rcp" as ideas because they were not on a list I found of dependencies for the high level library. This does not mean that it will work, but it is worth a try. Given access to the O/S we could find out what libraries each binary requires and look for a loophole.

On the permissions front we won't need execute permissions but we could need world read. Depends on what the default umask is in the first place.

Overall this would be much easier if you or I had a running copy of this AIX complete with the unusual addition of "bash".

I'd still be interested if there is someone out there who can write a binary file copy in "bash".

As you hinted in an earlier post, I too am surprised that this computer stayed running for any length of time.

There are still many options available almost all of which involve booting an alternative system to carry out a repair. Depends on local conditions and whether they have a full release kit and a fully documented system (it's a bit too late to do a hardware and software inventory).

Last edited by methyl; 10-07-2010 at 08:53 PM.. Reason: Removed my inane comment about making a binary copy executable. If shell does it we don't need an executable!
 

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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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