nagios 是着名的网络检测工具，功能相当强大，支持界面管理系统。而且还可以支持在个人电脑，服务器和虚拟机安装部署。它支持网络检测，入侵，数据流量的检测。
现在有第三方模块可以集成Asterisk接口。通过AMI来实现nagios 对asterisk的SIP/PSJIP，dahdi，IAX呼叫的监控。通过修改nagios 配置，集成AMI实现对asterisk通道检测。
#!/bin/bash
#
# Program : check_asterisk_ami
# :
# Author : Jason Rivers
# : Dave Burgess
# :
# Purpose : Nagios plugin to return Information from an Asterisk host
#using AMI
# :
# Parameters : --help
# : --version
# :
# Returns : Standard Nagios status_* codes as defined in utils.sh
# :
# Licence : GPL
#
# Notes : See --help for details
#============:==============================================================
PROGNAME=`basename $0`
PROGPATH=`echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,'`
REVISION=`echo '$Revision: 1.2.0.2 $' | sed -e 's/[^0-9.]//g'`
. $PROGPATH/utils.sh
print_usage（） {
echo "Usage: $PROGNAME [-H hostname] [-q query] [-u username] [-p password] [-P port] [-w warning] [-c critical]"
echo "-HHostname"
echo "-qCommand to query"
echo "-uAMI Username"
echo "-pAMI Password"
echo "-P（optional） AMI PORT"
echo "-w（optional） warning threshold"
echo "-c（optional） critical threshold"
echo ""
echo "SupportedCommands:"
echo "channels（check number of current channels in-use）"
echo "calls（check number of current calls）"
echo "pjsippeers（check number of current calls）"
echo "sippeers（check number of current calls）"
echo "sccppeers（check number of current calls）"
echo "iaxpeers（check number of current calls）"
echo ""
echo "Usage: $PROGNAME --help"
echo "Usage: $PROGNAME --version"
}
print_help（） {
print_revision $PROGNAME $REVISION
echo ""
echo "Nagios Plugin to check Asterisk using AMI"
echo ""
print_usage
echo ""
echo "Asterisk Call Status Check. Jason Rivers 2011"
echo ""
exit 0
# support
}
# If we have arguments, process them.
#
exitstatus=$STATE_WARNING #default
while test -n "$1"; do
case "$1" in
--help）
print_help
exit $STATE_OK
;;
-h）
print_help
exit $STATE_OK
;;
--version）
print_revision $PROGNAME $REVISION
exit $STATE_OK
;;
-V）
print_revision $PROGNAME $REVISION
exit $STATE_OK
;;
-H）
REMOTEHOST=$2;
shift;
;;
-P） AMIPORT=$2;
shift;
;;
-u） AMIUSER=$2;
shift;
;;
-p） AMIPASS=$2;
shift;
;;
-q） CHECK=$2;
shift;
;;
-c）
CRITICALNUMBER=$2
shift;
;;
-w）
WARNINGNUMBER=$2;
shift;
;;
*）
echo "Unknown argument: $1"
print_usage
exit $STATE_UNKNOWN
;;
esac
shift
done
if [ "${AMIPORT}" = "" ]; then
AMIPORT="5038"
fi
if [ "${CHECK}" = "channels" ]; then
##WARNING
if [ "$WARNINGNUMBER" = "" ]; then
WARNINGNUMBER=10
fi
if [ "$CRITICALNUMBER" = "" ]; then
CRITICALNUMBER=20
fi
## Checking active chanels on Asterisk
CHANNELS=`echo -e "Action: login\r\nUsername: ${AMIUSER}\r\nSecret: ${AMIPASS}\r\nEvents: off\r\n\r\nAction: CoreShowChannels\r\n\r\nAction: Logoff\r\n\r\n" | netcat $REMOTEHOST ${AMIPORT} | tee testout.txt | awk '/^ListItems/ {print $2}'|tr -d "\r"`
if [ "$CHANNELS" = "" ]; then
echo "UNKNOWN: Unable to get number of Channels"
exit $STATUS_UNKNOWN
fi
if [ $CHANNELS -lt $WARNINGNUMBER ]; then
exitstatus=$STATU_OK
MSG="OK: ${CHANNELS} Asterisk calls active|channels=${CHANNELS}"
elif [ $CHANNELS -lt $CRITICALNUMBER ]; then
exitstatus=$STATU_WARNING
MSG="WARNING: ${CHANNELS} Asterisk calls active|channels=${CHANNELS}"
elif [ $CHANNELS -ge $CRITICALNUMBER ]; then
exitstatus=$STATU_CRITICAL
MSG="CRITICAL: ${CHANNELS} Asterisk calls active|channels=${CHANNELS}"
fi
elif [ "${CHECK}" = "calls" ]; then
##WARNING
if [ "$WARNINGNUMBER" = "" ]; then
WARNINGNUMBER=5
fi
if [ "$CRITICALNUMBER" = "" ]; then
CRITICALNUMBER=10
fi
CALLS=`echo -e "Action: login\r\nUsername: ${AMIUSER}\r\nSecret: ${AMIPASS}\r\nEvents: off\r\n\r\nAction: Command\r\ncommand: Core Show Channels\r\n\r\nAction: Logoff\r\n\r\n" | netcat ${REMOTEHOST} ${AMIPORT} | awk '/active call/ {print $1}' | tr -d "\r"`
if [ "$CALLS" = "" ]; then
echo "UNKNOWN: Unable to get number of calls"
exit $STATUS_UNKNOWN
fi
if [ $CALLS -lt $WARNINGNUMBER ]; then
exitstatus=$STATE_OK
MSG="OK: ${CALLS} Asterisk calls active|calls=${CALLS}"
elif [ $CALLS -lt $CRITICALNUMBER ]; then
exitstatus=$STATE_WARNING
MSG="WARNING: ${CALLS} Asterisk calls active|calls=${CALLS}"
elif [ $CALLS -ge $CRITICALNUMBER ]; then
exitstatus=$STATE_CRITICAL
MSG="CRITICAL: ${CALLS} Asterisk calls active|calls=${CALLS}"
fi
if [ "$CALLS" = "" ]; then
CALLS=0
fi
elif [ "${CHECK}" = "iaxpeers" ]; then
##WARNING
if [ "$WARNINGNUMBER" = "" ]; then
WARNINGNUMBER=5
fi
if [ "$CRITICALNUMBER" = "" ]; then
CRITICALNUMBER=10
fi
IAXpeers=`echo -e "Action: login\r\nUsername: ${AMIUSER}\r\nSecret: ${AMIPASS}\r\nEvents: off\r\n\r\nAction: Command\r\ncommand: iax2 show peers\r\n\r\nAction: Logoff\r\n\r\n" | netcat ${REMOTEHOST} ${AMIPORT} | awk '/online/ {print $0}' | tr -d "\r"`
ONLINE=`echo $IAXpeers | sed 's/.*\[\（.*\） online.*unmonitored.*/\1/'`
OFFLINE=`echo $IAXpeers | sed 's/.*online, \（.*\） offline.*unmonitored.*/\1/'`
if [ "$OFFLINE" = "" ]; then
echo "UNKNOWN: Unable to get number of IAX Peers"
exit $STATUS_UNKNOWN
fi
if [ $OFFLINE -lt $WARNINGNUMBER ]; then
exitstatus=$STATE_OK
MSG="OK: ${ONLINE} online, ${OFFLINE} offline IAX2 peers|online=${ONLINE} offline=${OFFLINE}"
elif [ $OFFLINE -lt $CRITICALNUMBER ]; then
exitstatus=$STATE_WARNING
MSG="WARNING: ${ONLINE} online, ${OFFLINE} offline IAX2 peers|online=${ONLINE} offline=${OFFLINE}"
elif [ $OFFLINE -ge $CRITICALNUMBER ]; then
exitstatus=$STATE_CRITICAL
MSG="CRITICAL: ${ONLINE} online, ${OFFLINE} offline IAX2 peers|online=${ONLINE} offline=${OFFLINE}"
fi
elif [ "${CHECK}" = "sippeers" ]; then
##WARNING
if [ "$WARNINGNUMBER" = "" ]; then
WARNINGNUMBER=5
fi
if [ "$CRITICALNUMBER" = "" ]; then
CRITICALNUMBER=10
fi
SIPpeers=`echo -e "Action: login\r\nUsername: ${AMIUSER}\r\nSecret: ${AMIPASS}\r\nEvents: off\r\n\r\nAction: Command\r\ncommand: sip show peers\r\n\r\nAction: Logoff\r\n\r\n" | netcat ${REMOTEHOST} ${AMIPORT} | awk '/online/ {print $0}' | tr -d "\r"`
ONLINE=`echo $SIPpeers | sed 's/.*Monitored: \（.*\） online.*Unmonitored.*/\1/'`
OFFLINE=`echo $SIPpeers | sed 's/.*online, \（.*\） offline.*Unmonitored.*/\1/'`
if [ "$OFFLINE" = "" ]; then
echo "UNKNOWN: Unable to get number of SIP Peers"
exit $STATUS_UNKNOWN
fi
if [ $OFFLINE -lt $WARNINGNUMBER ]; then
exitstatus=$STATE_OK
MSG="OK: ${ONLINE} online, ${OFFLINE} offline SIP peers|online=${ONLINE} offline=${OFFLINE}"
elif [ $OFFLINE -lt $CRITICALNUMBER ]; then
exitstatus=$STATE_WARNING
MSG="WARNING: ${ONLINE} online, ${OFFLINE} offline SIP peers|online=${ONLINE} offline=${OFFLINE}"
elif [ $OFFLINE -ge $CRITICALNUMBER ]; then
exitstatus=$STATE_CRITICAL
MSG="CRITICAL: ${ONLINE} online, ${OFFLINE} offline SIP peers|online=${ONLINE} offline=${OFFLINE}"
fi
elif [ "${CHECK}" = "pjsippeers" ]; then
##WARNING
if [ "$WARNINGNUMBER" = "" ]; then
WARNINGNUMBER=5
fi
if [ "$CRITICALNUMBER" = "" ]; then
CRITICALNUMBER=10
fi
echo -e "Action: login\r\nUsername: ${AMIUSER}\r\nSecret: ${AMIPASS}\r\nEvents: off\r\n\r\nAction: Command\r\ncommand: pjsip show endpoints\r\n\r\nAction: Logoff\r\n\r\n" | netcat ${REMOTEHOST} ${AMIPORT} | grep " Endpoint:" | tail -n +2 > /tmp/hold
cat /tmp/hold
LINES=`cat /tmp/hold | wc -l`
UP=`cat /tmp/hold | grep ' In use ' | wc -l`
ONLINE=`cat /tmp/hold | grep 'Not in use' | wc -l`
ONLINE=`expr $ONLINE + $UP`
OFFLINE=`cat /tmp/hold | grep Unavailable | wc -l`
rm -f /tmp/hold
#echo $LINES
#echo $ONLINE
#echo $OFFLINE
if [ "$OFFLINE" = "" ]; then
echo "UNKNOWN: Unable to get number of PJ-SIP Endpoints"
exit $STATUS_UNKNOWN
fi
if [ $OFFLINE -lt $WARNINGNUMBER ]; then
exitstatus=$STATE_OK
MSG="OK: ${ONLINE} online, ${OFFLINE} offline PJ-SIP endpoints|online=${ONLINE} offline=${OFFLINE}"
elif [ $OFFLINE -lt $CRITICALNUMBER ]; then
exitstatus=$STATE_WARNING
MSG="WARNING: ${ONLINE} online, ${OFFLINE} offline PJ-SIP endpoints|online=${ONLINE} offline=${OFFLINE}"
elif [ $OFFLINE -ge $CRITICALNUMBER ]; then
exitstatus=$STATE_CRITICAL
MSG="CRITICAL: ${ONLINE} online, ${OFFLINE} offline PJ-SIP endpoints|online=${ONLINE} offline=${OFFLINE}"
fi
elif [ "${CHECK}" = "sccpdevices" ]; then
##WARNING
if [ "$WARNINGNUMBER" = "" ]; then
WARNINGNUMBER=5
fi
if [ "$CRITICALNUMBER" = "" ]; then
CRITICALNUMBER=10
fi
SCCPdevices=`echo -e "Action: login\r\nUsername: ${AMIUSER}\r\nSecret: ${AMIPASS}\r\nEvents: off\r\n\r\nAction: Command\r\ncommand: sccp show devices\r\n\r\nAction: Logoff\r\n\r\n" | netcat ${REMOTEHOST} ${AMIPORT} | awk '/online/ {print $0}' | tr -d "\r"`
ONLINE=`echo $SCCPdevices | sed 's/.*Monitored: \（.*\） online.*Unmonitored.*/\1/'`
OFFLINE=`echo $SCCPdevices | sed 's/.*online, \（.*\） offline.*Unmonitored.*/\1/'`
if [ "$OFFLINE" = "" ]; then
echo "UNKNOWN: Unable to get number of SCCP Peers"
exit $STATUS_UNKNOWN
fi
if [ $OFFLINE -lt $WARNINGNUMBER ]; then
exitstatus=$STATE_OK
MSG="OK: ${ONLINE} online, ${OFFLINE} offline SCCP devices|online=${ONLINE} offline=${OFFLINE}"
elif [ $OFFLINE -lt $CRITICALNUMBER ]; then
exitstatus=$STATE_WARNING
MSG="WARNING: ${ONLINE} online, ${OFFLINE} offline SIP devices|online=${ONLINE} offline=${OFFLINE}"
elif [ $OFFLINE -ge $CRITICALNUMBER ]; then
exitstatus=$STATE_CRITICAL
MSG="CRITICAL: ${ONLINE} online, ${OFFLINE} offline SIP devices|online=${ONLINE} offline=${OFFLINE}"
fi
else
echo="CRITICAL: Unknown command"
print_help
exit=$STATE_CRITICAL
fi
echo $MSG
exit $exitstatus
当然，nigios 不仅仅支持原生态的asterisk，同样也可以支持freepbx。在连接freePBX时用户需要注意用户名称和密码，SIP端口等等问题。按照代码修改到相应的配置。
