nagios + chroot (test on openbsd)

[julien Touche]

on openbsd 3.3-beta, i'm trying to get nagios working with chroot apache

as cgi-bin (normally in sbin) use same conf files as nagios daemon, i 
must have same path in the two and also chroot nagios (maybe try to 
duplicate conf files, idea ?)

on openbsd, apache is in /var/www
i choose to install in /var/www/users/nagios for daemon/etc/...
and /var/www/htdocs/nagios for share/sbin/libexec

i compile in static nagios/cgi-bin & plugins (mainly thanks to benny patch)
i need to change cgi/Makefile path (erase /var/www part) as path is hard 
coded in for compile (and return normal for make install) and in 
common/locations.h.
and few changes in cfg files
i can start nagios in chroot, but two problems i have not find solution 
for the moment

all plugins return in nagios.log
---
[1046955533] Warning: Return code of 127 for check of service 'SSH' on 
host 'toto' was out of bounds.
Make sure the plugin you're trying to run actually exists
---

path is good and when i chroot a root shell in /var/www, i can execute them
check_ssh need /etc/protocols: ok
check_dns: segmentation fault
check_tcp complains about /etc/protocols, but works
check_disk is no more
check_ups ok
others later.


second
tac.cgi return in browser binary data with
---
Failure reading ld.so
Bad magic: ld.so
Cannot map ld.so
crt0: update /usr/libexec/ld.so
ld.so failed
---
and some binary between and html code too

nagios is static, nothing change when i add a ld.so in chroot and for 
fun trying to ktrace it (always in chroot) gives a core with
  22023 ktrace   RET   ktrace 0
  22023 ktrace   CALL  execve(0xcfbfdb0f,0xcfbfda98,0xcfbfdaa0)
  22023 ktrace   NAMI  "/usr/libexec/ld.so"
  22023 ld.so    EMUL  "native"
  22023 ld.so    RET   execve 0
  22023 ld.so    PSIG  SIGSEGV SIG_DFL code 1 addr=0x20 trapno=1
  22023 ld.so    PSIG  SIGSEGV SIG_DFL code 0 addr=0x0 trapno=0
  22023 ld.so    NAMI  "ld.so.core"

in chroot shell, normal response, but
Error: Could not open main config file '/opt/nagios/etc/nagios.cfg'
(before it doesn't find cgi.cfg, but correct with common/locations.h)

/opt/nagios was the place were i install before testing chroot but which 
is no more used
bash-2.05b$ grep "/opt" /tmp2/nagios/nagios-1.0/*
/tmp2/nagios/nagios-1.0/functions:PATH=/opt/gnu/bin:/sbin:/usr/sbin:/bin:/usr/bin:/usr/X11R6/bin

so i don't know where it comes from.


Regards

		Julien

Note: also, nagios, started with chroot -u nagios -g nagios $ChrootBase, 
complains about it cannot change uid/gid, but doesn't matter a lot

Note2: please cc.



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