|
#!/bin/sh /etc/rc.common
|
|
# Copyright (C) 2009-2016 OpenWrt.org
|
|
# Copyright (C) 2016 Luke McKee <hojuruku@gmail.com>
|
|
# Procd init script reference: http://wiki.prplfoundation.org/wiki/Procd_reference
|
|
|
|
START=98
|
|
USE_PROCD=1
|
|
PROG=/usr/bin/mini_snmpd
|
|
NAME=mini_snmpd
|
|
|
|
_log() {
|
|
logger -p daemon.info -t mini_snmpd "$@"
|
|
}
|
|
|
|
_err() {
|
|
logger -p daemon.err -t mini_snmpd "$@"
|
|
}
|
|
|
|
|
|
# mini_snmpd 1.3+ now starts later in the game. Expects filesystems monitored to be already mounted, or wont pass args to mini_snmpd
|
|
# and at least configuration entry for network physical interface defined in /etc/config/network
|
|
# It handles network interfaces not yet present (e.g. ppp) but will statfs() the root/wrong filesystem if device not mounted
|
|
# Tip: complex scripts run faster without in openwrt if you stop busybox forking and searching for applets. Faster bootups
|
|
# CONFIG_BUSYBOX_CONFIG_FEATURE_SH_NOFORK
|
|
# CONFIG_BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS
|
|
# BUSYBOX_CONFIG_ASH_OPTIMIZE_FOR_SIZE [=n]
|
|
# CONFIG_BUSYBOX_CONFIG_ASH_CMDCMD
|
|
|
|
mini_snmpd_validation="enabled:bool:0 \
|
|
ipv6:bool:0 \
|
|
debug:bool:0 \
|
|
auth:bool:1 \
|
|
community:rangelength(1,32):public \
|
|
contact:maxlength(255) \
|
|
location:maxlength(255) \
|
|
listen_interface:uciname \
|
|
udp_port:port \
|
|
tcp_port:port \
|
|
vendor_oid:string \
|
|
mib_timeout:and(min(1),uinteger) \
|
|
disks:list(directory) \
|
|
interfaces:list(uciname) \
|
|
respawn_threshold:uinteger respawn_timeout:uinteger respawn_retry:uinteger"
|
|
# busybox ash has no array variable support, when put validations in a string be careful to have no spaces in each validate constraint
|
|
# this makes it very difficult to use the 'or(uciname, "all")' test, so listen_interface '' or undefined now meands bind to "all".
|
|
# this is the sarafice you have to make to avoid typing it all in twice in this script so we can give feedback to user on what's misconfigered
|
|
# in syslog
|
|
|
|
append_disk() {
|
|
local disk="$1" disk_count
|
|
[ -z $disk_count ] && disk_count=0
|
|
if grep -qF "$disk" /proc/mounts ; then
|
|
# check the fileystem is mountpoint, and directory search permissions available for statfs()
|
|
# presence as a directory -d test done is already done by uci_validate_section()
|
|
[ -x "$disk" ] || {
|
|
_err "$cfg: mountpoint $disk for snmp monitoring EACCES error. Check permissions, ignoring"
|
|
return 1
|
|
}
|
|
if [ $disk_count -lt 4 ] ; then
|
|
append disks_arg "$disk" ','
|
|
disk_count=$((disk_count++))
|
|
else
|
|
_err "$cfg: more than 4 mountpoints defined in uci. Disc $disk ignored."
|
|
fi
|
|
else
|
|
_err "$cfg: mountpoint $disk for snmp monitoring not mounted, ignoring."
|
|
fi
|
|
}
|
|
|
|
append_interface() {
|
|
local name="$1" netdev netdev_count
|
|
[ -z $netdev_count ] && netdev_count=0
|
|
# for the purposes of snmp monitoring it doesn't need to be up, it just needs to exist in /proc/net/dev
|
|
network_get_device netdev "$name"
|
|
if [ -n "$netdev" ] && grep -qF "$netdev" /proc/net/dev ]; then
|
|
[ $netdev_count -ge 4 ] && {
|
|
_err "$cfg: too many network interfaces configured, ignoring $name"
|
|
return
|
|
}
|
|
netdev_count=$((netdev_count++))
|
|
if [ -n "$interfaces_arg" ]; then
|
|
append interfaces_arg "$netdev" ','
|
|
else
|
|
append interfaces_arg "$netdev"
|
|
fi
|
|
else
|
|
_log "$cfg: physical interface for network $name not found in uci or kernel so not monitoring"
|
|
fi
|
|
}
|
|
|
|
append_arg() {
|
|
local var="$2"
|
|
local opt="$1"
|
|
[ -n "$var" ] && procd_append_param command $opt "$var"
|
|
}
|
|
|
|
watch_interfaces() {
|
|
local cfg="$1"
|
|
local enabled listen_interface # listen_interface_up
|
|
config_get_bool enabled "$cfg" "enabled" '1'
|
|
[ "$enabled" -gt 0 ] || return 0
|
|
config_get listen_interface "$cfg" listen_interface
|
|
# If the interface is up & instance is running we'll watch at the instance level and only restart that instance if it's bound interface changes
|
|
# Regardless of ubus knowing about an interface (in the case it's not yet configured)
|
|
[ -n "$listen_interface" ] && trigger_interfaces="${listen_interface} ${trigger_interfaces} "
|
|
# Restart daemon if one of monitored interfaces changes
|
|
config_get reload_interfaces "$cfg" interfaces
|
|
|
|
}
|
|
|
|
validate_mini_snmpd_section() {
|
|
# validate a mini_snmpd instance in uci config file mini_snmpd
|
|
# http://luci.subsignal.org/trac/wiki/Documentation/Datatypes ubox/validate/validate.c
|
|
uci_validate_section mini_snmpd mini_snmpd "${1}" $mini_snmpd_validation
|
|
}
|
|
|
|
|
|
service_triggers() {
|
|
config_load 'mini_snmpd'
|
|
procd_open_trigger
|
|
procd_add_config_trigger "config.change" "mini_snmpd" /etc/init.d/mini_snmpd reload
|
|
config_foreach watch_interfaces 'mini_snmpd'
|
|
# this only watches interfaces for which there is no running instance due to interface down / not in ubus
|
|
# hence start not reload, this trigger will not affect running instances as another start will not change their procd command arguments
|
|
# or stop the already running process
|
|
[ -n "$trigger_interfaces" ] & {
|
|
for n in $trigger_interfaces ; do
|
|
procd_add_interface_trigger "interface.*" $n /etc/init.d/mini_snmpd start
|
|
done
|
|
}
|
|
[ -n "$reload_interfaces" ] && {
|
|
for n in $reload_interfaces; do
|
|
procd_add_reload_interface_trigger $n
|
|
done
|
|
}
|
|
procd_close_trigger
|
|
procd_add_validation validate_mini_snmpd_section
|
|
}
|
|
|
|
|
|
start_instance() {
|
|
local cfg validation_failed validation_err disks_arg interfaces_arg
|
|
cfg="$1"
|
|
#uci_validate_section should unset undefined variables from other instances
|
|
#however defining uci variables as local will scope them to this instance
|
|
#"local variables are also visible to functions called by the parent function" so it's good practice
|
|
local enabled ipv6 debug auth community contact location listen_interface \
|
|
udp_port tcp_port vendor_oid mib_timeout
|
|
local disks="" interfaces=""
|
|
validate_mini_snmpd_section "$cfg" 2>/dev/null || validation_failed=1
|
|
[ "$enabled" == 1 ] || {
|
|
_log "instance:$cfg disabled not starting"
|
|
return 1
|
|
}
|
|
|
|
local listen_interface_json listen_interface_ip listen_interface_device listen_interface_up
|
|
[ -n "$listen_interface" ] && {
|
|
if [ "$ipv6" = 1 ]; then
|
|
network_get_ipaddrs6 listen_interface_ip "$listen_interface"
|
|
else
|
|
network_get_ipaddrs listen_interface_ip "$listen_interface"
|
|
fi
|
|
network_is_up "$listen_interface" && [ -n "$listen_interface_ip" ] || {
|
|
_log "$cfg:listen interface $listen_interface not up yet / not configured properly"
|
|
_log "$cfg:procd will try again when interface state changes"
|
|
return 1
|
|
}
|
|
network_get_physdev listen_interface_device "$listen_interface"
|
|
}
|
|
|
|
[ $validation_failed ] && {
|
|
_err "validation of $NAME configuration for $cfg instance failed, all tests should be within constraints"
|
|
_err "please edit the configuration values below using [l]uci "
|
|
validation_err=`/sbin/validate_data mini_snmpd mini_snmpd "$cfg" $mini_snmpd_validation 2>&1 | sed '/with\ false$/!d;s/validates\ as\ /needs\ to\ be\ /;s/with\ false//' `
|
|
_err "${validation_err}"
|
|
return 1
|
|
}
|
|
config_list_foreach "$cfg" 'disks' append_disk
|
|
config_list_foreach "$cfg" 'interfaces' append_interface
|
|
# test if variables are unset or zero length
|
|
[ -z "${disks_arg:+1}" -a -z "${interfaces_arg:+1}" ] && {
|
|
_err "$cfg: you haven't sucessfully configured any mountpoints or disks for this instance, not starting"
|
|
return 1
|
|
}
|
|
|
|
procd_open_instance
|
|
|
|
procd_set_param command "$PROG" -n
|
|
procd_set_param stdout "1"
|
|
procd_set_param stderr "1"
|
|
# don't the like default respawn values? you can override through uci.
|
|
# vars left as global so you only need to do it in the first mini_snmpd instance
|
|
procd_set_param respawn ${respawn_threshold:-3600} ${respawn_timeout:-10} ${respawn_retry:-1}
|
|
# this monitors ubus changes
|
|
[ -n "$listen_interface" ] && {
|
|
#procd_open_trigger
|
|
#procd_add_interface_trigger "interface.*" $listen_interface /etc/init.d/mini_snmpd reload
|
|
#procd_close_trigger
|
|
procd_add_reload_interface_trigger $listen_interface #or use shorthand of above
|
|
}
|
|
# this re-starts the daemon if a properly configured network interface is changed whilst it is already running
|
|
# igmpproxy has this as well as "procd_set_param netdev"
|
|
|
|
append_arg "-c" "$community"
|
|
append_arg "-L" "${location}"
|
|
append_arg "-C" "${contact}"
|
|
append_arg "-p" $udp_port
|
|
append_arg "-P" $tcp_port
|
|
append_arg "-V" "${vendor_oid}"
|
|
append_arg "-t" $mib_timeout
|
|
|
|
[ "$ipv6" = 1 ] && procd_append_param command "-6"
|
|
[ "$debug" = 1 ] && procd_append_param command "-v"
|
|
# uci_validate_section() aka /sbin/validate_data can only cast default values not defined in /etc/config/* to string
|
|
# e.g. ="1" however it sets bools defined in /etc/config/* to =1 / =0
|
|
[ "$auth" = 1 -o "$auth" = "1" ] && procd_append_param command "-a"
|
|
[ -n "$disks_arg" ] && procd_append_param command "-d" "$disks_arg"
|
|
[ -n "$interfaces_arg" ] && {
|
|
procd_append_param netdev ${interfaces_arg//,/ }
|
|
procd_append_param command "-i" "$interfaces_arg"
|
|
}
|
|
[ -n "$listen_interface_device" ] && {
|
|
procd_append_param command "-I" "$listen_interface_device"
|
|
# and this monitors the hardware device for changes outside of ubus - just a guess
|
|
procd_append_param netdev $listen_interface_device
|
|
}
|
|
procd_close_instance
|
|
}
|
|
|
|
start_service() {
|
|
. /lib/functions.sh
|
|
. /lib/functions/network.sh
|
|
|
|
config_load 'mini_snmpd'
|
|
config_foreach start_instance 'mini_snmpd'
|
|
}
|
|
|