Commit the noping ping wrapper

Author: stolf

noping.sh

@@ -0,0 +1,94 @@
+#/bin/bash
+
+# Lightweight bash script that processes ping's output in realtime and
+# suppresses normal ping responses and prints instead only on packets lost
+# and errors. It handles SIGQUIT correctly so that it can be used to invoke
+# pings summary lines mid run. It also allows for the ping summary
+# footer to be printed at the end.
+
+# This script focus's on being fork light. It only forks ping once to do the
+# actuall ICMP work, and date per loss block. Everything else is bash internals.
+
+# Note the time stamps reported when an ICMP reply is recieved, and the lost 
+# block is calculated.
+
+
+
+
+
+# Authors Chris Browning <[email protected]>
+
+# Copyright 2013 Lightwire Limited
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+# http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+last=0
+prev=0
+printit=0
+
+
+ping $@ | while read i
+trap "" SIGQUIT
+trap "" SIGINT
+do
+	# Deal with printing summary at the end
+	if [ $printit -eq 1 ]; then
+
+		# Add any additional loss based on summary data
+		val=${i// packets transmitted*/}
+		if [[ $val != *[!0-9]* ]]; then
+			if [ -n "$val" ]; then
+				if [ "$val" -ne "$last" ]; then
+					echo "`date +'%F %T'`: Lost $((val-last)) additional packets at quit ($((last+1)) to $((val)))"
+				fi
+			fi
+		fi
+
+		# Header finished exit
+		if [ -z "$i" ]; then
+			exit 0
+		fi
+
+		# Print summary data
+		echo $i
+		continue
+	fi
+
+	# Pull the request id
+	val=${i//* icmp_req=/}
+	val=${val// */}
+
+	# Detect and deal with the Ping Header
+	if [ "$val" == "PING" ]; then
+		continue
+	fi
+
+	# Detect and deal with start of Ping Summary
+	if [ -z "$val" ]; then
+		echo $i
+		printit=1
+		continue
+	fi
+
+	# Deal with ICMP error responses (print them to screen)
+	if [[ $val != *[!0-9]* ]]; then
+		# Normal response
+		if [ "$((val-1))" -ne "$last" ]; then
+			echo "`date +'%F %T'`: Lost $((val-1-last)) packets ($((last+1)) to $((val-1)))"
+		fi
+		last=$val
+	else
+		echo $i
+	fi
+done