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hi,

hacking around in Icinga Core, the patch on the nagios-exp.git
repository on git.op5.org for using local macros on the notifications
came up with a bug on the host notifications.
basically, a memset was missing in order to allocate memory before
accessing/freeing the macro struct. See over here
https://dev.icinga.org/issues/1703 and/or below. On Icinga GIT you will
recognize the commit already.


start gdb

~/nagios/nagios-exp $ sudo gdb base/nagios

(gdb) run /usr/local/nagios/etc/nagios.cfg
Starting program: nagios/nagios-exp/base/nagios
/usr/local/nagios/etc/nagios.cfg
[Thread debugging using libthread_db enabled]

Nagios Core 3.3.1
Copyright (c) 2009-2011 Nagios Core Development Team and Community
Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 02-13-2011
License: GPL

Website: http://www.nagios.org
Nagios 3.3.1 starting... (PID=10221)
Local time is Wed Jul 13 17:47:18 CEST 2011
[New Thread 0x40a00940 (LWP 10224)]
[New Thread 0x41401940 (LWP 10225)]


send a custom host notification

# /usr/bin/printf "[1310543176]
SEND_CUSTOM_HOST_NOTIFICATION;localhost;2;nagiosadmin;foobar" >
/usr/local/nagios/var/rw/nagios.cmd


watch it die ...

ARGS: localhost;2;nagiosadmin;foobar

Program received signal SIGSEGV, Segmentation fault.
0x0000003fe247273e in free () from /lib64/libc.so.6

attached is a patch, which fixes this accordingly and applies cleanly to
nagios-exp HEAD.

Nagios 3.3.1 starting... (PID=13983)
Local time is Wed Jul 13 18:00:23 CEST 2011
[New Thread 0x40a00940 (LWP 13986)]
[New Thread 0x41401940 (LWP 13987)]
ARGS: localhost;2;nagiosadmin;foobar
Detaching after fork from child process 14060.

feel free to use the patch or introduce a proper solution


kind regards,
Michael


backtrace.

(gdb) bt full
#0 0x0000003fe247273e in free () from /lib64/libc.so.6
No symbol table info available.
#1 0x000000000042fa91 in clear_volatile_macros_r (mac=0x7fffffffdf00) at
../common/macros.c:2824
this_customvariablesmember =
next_customvariablesmember =
x = 2
#2 0x0000000000439b99 in host_notification (hst=0x6b8440, type=99,
not_author=0x6b4d00 "nagiosadmin", not_data=0x6b5230 "foobar",
options=2) at notifications.c:1041
temp_notification =
temp_contact =
current_time =
start_time = {tv_sec = 1310572223, tv_usec = 700585}
end_time = {tv_sec = 7012920, tv_usec = 7}
escalated = 0
result =
contacts_notified =
increment_notification_number =
mac = {x = {0x0, 0x0, 0x20 , 0x0, 0x64000000
, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0xa , 0x5c ,
0xffffffff0000000a , 0x480b01
"s\n", 0x0, 0x25 ,
0x1 , 0x21 ,
0x100000001 ,
0x490ab8 "d\n", 0x0, 0x0, 0x3fe248d98f "\205\300\017\204\231\001", 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x1 , 0x0, 0x3000000018 , 0x7fffffffe380 "\300\352\340\302>",
0x801 , 0x9802f , 0x1 ,
0x81a4 , 0x0, 0x0, 0x8a3 , 0x1000 ,
0x10 , 0x4e1dbeb0 , 0x0,
0x4aef1ace , 0x0, 0x4aef1ace , 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x3fe27529e0 "", 0x3fe2520afb "/etc/localtime", 0xf , 0x69e890 "/etc/localtime",
0x3fe27535a0 "", 0x6bf13b "\342?", 0x3fe2474cde
"H\205\300H\211\305tJ\203=;\022.", 0xf <Address 0xf

...[email truncated]...


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