Topic: mini_snmpd - basic init script

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Post #1

opotonil

6 Jul 2009, 20:28

Hi,

Configuration file ( /etc/config/mini_snmpd):

config 'mini_snmpd'
        option 'community' 'public'
        option 'location' 'spain'
        option 'contact' 'direccion@correo.es'
        option 'disks' '/tmp,/jffs'
        option 'interfaces' 'lo,br-lan,eth0.1,eth1' # Max 4 ¿?

Init script (/etc/init.d/mini_snmpd):

#!/bin/sh /etc/rc.common
# Copyright (C) 2006 OpenWrt.org

START=50

mini_snmpd_config() {
        config_get community $1 community
        config_get location $1 location
        config_get contact $1 contact
        config_get disks $1 disks
        config_get interfaces $1 interfaces
}

start() {
        config_load mini_snmpd
        config_foreach mini_snmpd_config mini_snmpd

        /sbin/mini_snmpd -c $community -L $location -C $contact -d $disks -i $interfaces &
}

stop() {
        killall mini_snmpd
}

Set executable and link it:

# chmod +x /etc/init.d/mini_snmpd
# cd /etc/rc.d/
# ln -s ../init.d/mini_snmpd S50mini_snmpd

Reboot and try from remote machine (snmpwalk -c public -v 2c 192.168.1.1)

Bye.

PD: Open port 161 on firewall... only for lan.

(Last edited by opotonil on 6 Jul 2009, 20:48)

Post #2

Dogge

11 Jul 2009, 11:39

opotonil wrote:

# chmod +x /etc/init.d/mini_snmpd
# cd /etc/rc.d/
# ln -s ../init.d/mini_snmpd S50mini_snmpd

This is not correct. Instead of above use:

root@OpenWrt:~# chmod +x /etc/init.d/mini_snmpd
root@OpenWrt:~# /etc/init.d/mini_snmpd enable # Creates the symlink in /etc/rc.d/ from START=50 in the init script. Use '/etc/init.d/mini_snmpd disable' to delete the symlink.
root@OpenWrt:~# /etc/init.d/mini_snmpd start

(Last edited by Dogge on 11 Jul 2009, 11:42)

Post #3

Dogge

11 Jul 2009, 12:03

/etc/config/mini_snmpd

config 'mini_snmpd'
    option 'enabled' '1'
    option 'community' 'public'
    option 'location' 'spain'
    option 'contact' 'direccion@correo.es'
    option 'disks' '/tmp,/jffs'
    option 'interfaces' 'lo,br-lan,eth0.1,eth1' # Max 4

/etc/init.d/mini_snmpd

#!/bin/sh /etc/rc.common
# Copyright (C) 2009 OpenWrt.org

NAME=mini_snmpd
PROG=/usr/bin/$NAME
START=50

append_string() {
    local section="$1"
    local option="$2"
    local value="$3"
    local _val
    config_get _val "$section" "$option"
    [ -n "$_val" ] && append args "$3 $_val"
}

mini_snmpd_config() {
    local cfg="$1"
    args=""

    append_string "$cfg" community "-c"
    append_string "$cfg" location "-L"
    append_string "$cfg" contact "-C"
    append_string "$cfg" disks "-d"
    append_string "$cfg" interfaces "-i"
    
        config_get_bool enabled "$cfg" "enabled" '1'c
        [ "$enabled" -gt 0 ] && $PROG $args &
}

start() {
        config_load mini_snmpd
        config_foreach mini_snmpd_config mini_snmpd
}

stop() {
    killall mini_snmpd
}

root@OpenWrt:~# chmod +x /etc/init.d/mini_snmpd
root@OpenWrt:~# /etc/init.d/mini_snmpd enable # Creates the symlink in /etc/rc.d/ from START=50 in the init script. Use '/etc/init.d/mini_snmpd disable' to delete the symlink.
root@OpenWrt:~# /etc/init.d/mini_snmpd start

Maybe You can also write an LuCI application for it

Post #4

opotonil

11 Jul 2009, 19:37

All right, the correct is:

/etc/init.d/mini_snmpd enable

And your init script is more elegant, thanks. But the correct path to mini_snmp is "/sbin/mini_snmpd", on my case.

/etc/init.d/mini_snmpd (It is same as your script but variable names are more clear, I think)

#!/bin/sh /etc/rc.common                  
# Copyright (C) 2006 OpenWrt.org          

NAME=mini_snmpd
PROG=/sbin/$NAME
START=50        

append_param() {
        local section="$1"
        local option="$2" 
        local arg="$3"    
        local value       

        config_get value "$section" "$option"
        [ -n "$value" ] && append params "$arg $value"
}                                                     

mini_snmpd_config() {
        local cfg="$1"
        params=""

        append_param "$cfg" community "-c"
        append_param "$cfg" location "-L"
        append_param "$cfg" contact "-C"
        append_param "$cfg" disks "-d"
        append_param "$cfg" interfaces "-i"

        config_get_bool enabled "$cfg" "enabled" '1'
}

start() {
        config_load mini_snmpd
        config_foreach mini_snmpd_config mini_snmpd

        [ "$enabled" -gt 0 ] && $PROG $params &
}

stop() {
        killall mini_snmpd
}

Maybe You can also write an LuCI application for it smile

I have to look for instructions or how-to and for time... Thanks again.

(Last edited by opotonil on 11 Jul 2009, 19:41)

Post #5

bulldozer2003

15 Dec 2009, 22:30

I've copied the configs as they appear and the $params variable seems to remain empty. I edited the /etc/init.d/mini_snmpd file as follows for transparency.

#!/bin/sh /etc/rc.common                  
# Copyright (C) 2006 OpenWrt.org          

NAME=mini_snmpd
PROG=/sbin/$NAME
START=50        

append_param() {
        local section="$1"
        local option="$2" 
        local arg="$3"    
        local value       

        config_get value "$section" "$option"
        [ -n "$value" ] && append params "$arg $value"
}                                                     

mini_snmpd_config() {
        local cfg="$1"
        params="-a "
        echo $1
        append_param "$cfg" community "-c"
        append_param "$cfg" description "-D"
        append_param "$cfg" location "-L"
        append_param "$cfg" contact "-C"
        append_param "$cfg" disks "-d"
        append_param "$cfg" interfaces "-i"
        echo test $params
        config_get_bool enabled "$cfg" "enabled" '1'
}

start() {
        config_load mini_snmpd
        config_foreach mini_snmpd_config mini_snmpd

#        [ "$enabled" -gt 0 ] && 
         echo $PROG
         echo $params
         $PROG $params &
}

stop() {
        killall mini_snmpd
}

Output from /etc/init.d/mini_snmpd start, first is "echo $PROG" second line is "echo $params":

/sbin/mini_snmpd

Here is my /etc/config/mini_snmpd

config mini_snmpd
    option enabled '1'
    option community 'blah'
    option description 'Kamikaze8.09'
    option location 'location'
    option contact 'NOC'
    option disks '/tmp,/jffs'
    option interfaces 'lo,br-lan,wl0'

(Last edited by bulldozer2003 on 15 Dec 2009, 22:31)

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