Date: Wed, 24 Dec 2008 14:22:34 -0500 From: "Brian A. Seklecki" <bseklecki@collaborativefusion.com> To: freebsd-questions@freebsd.org Cc: Bill Moran <wmoran@collaborativefusion.com> Subject: Default list of exported variables in sh(1) - $HOSTNAME Message-ID: <1230146554.4673.265.camel@soundwave.ws.pitbpa0.priv.collaborativefusion.com>
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All:
I've got a fun problem ...
I'm having trouble tracking down where the default list of exported
variables is set for sh(1).
I've got a piece of PHP code that runs on GNU/Linux but not FreeBSD
because (I think) $HOSTNAME is exported by default.
The PHP CLI calls $_ENV["HOSTNAME"], which under GNU/Linux returns:
$ php -r 'print gethostbyaddr(gethostbyname($_ENV["HOSTNAME"]))'
soundwave.ws....collaborativefusion.com
In HTTP/CGI mode, I can call $_SERVER[]. But $_ENV[] should work in both
CLI and HTTP mode.
However, because Apache is spawned from sh(1) from rc(8) and in FreeBSD
6.x, $HOSTNAME is not exported by default, which is what $_ENV[] uses
(getenv()):
$ uname -a
FreeBSD bdb00 6.3-RELEASE-p2
$ export
SSH_CLIENT
USER
MAIL
HOME
SSH_TTY
PAGER
ENV
LOGNAME
BLOCKSIZE
TERM
PATH
SHELL
SSH_CONNECTION
FTP_PASSIVE_MODE
EDITOR
-----------
Compare to:
linux$ uname -a
Linux soundwave 2.6.25.14-108.fc9.x86_64
linux$ bash --version
GNU bash, version 3.2.33(1)-release (x86_64-redhat-linux-gnu)
linux$ export|wc -l
52
linux$ export|grep -i host
declare -x HOSTNAME="soundwave"
------------
It could be set in the sources for sh(1) or shells/bash, login(1),
possibly somehow related to PAM.
src/usr.bin/login/login.c has :
static int export(const char *s) {
* - Do not export certain variables. This list was taken from the
* Solaris pam_putenv(3) man page.
* Then export it.
static const char *noexport[] = {
"SHELL", "HOME", "LOGNAME", "MAIL", "CDPATH",
"IFS", "PATH", NULL
}..
$HOSTNAME not listed here
-------------------
src/bin/sh/var.c has environment(){} and at least one other call to
getnamebyaddr()
------------
Bash has set_machine_vars() in variables.c:
temp_var = set_if_not ("HOSTNAME", current_host_name);
-------------
There are also about 500 calls to getenv() in the PHP source code under
main/, however none explicitly for $HOSTNAME.
This is similar to bash, so unless the Redhat people are maintaining
lots of SRPM patches to Bash _and_ PHP, I'm prepared to isolate the
problem to FreeBSD and sh(1)/login(1)
Thoughts? (Happy holidays all!)
~BAS
--
Brian A. Seklecki <bseklecki@collaborativefusion.com>
Collaborative Fusion, Inc.
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