src/patches/dnsmasq/0053-Log-parsing-utils-in-contrib-reverse-dns.patch

   1 From 47b9ac59c715827252ae6e6732903c3dabb697fb Mon Sep 17 00:00:00 2001
   2 From: Joachim Zobel <jz-2014@heute-morgen.de>
   3 Date: Mon, 23 Feb 2015 21:38:11 +0000
   4 Subject: [PATCH 53/55] Log parsing utils in contrib/reverse-dns
   5
   6 ---
   7  contrib/reverse-dns/README             | 18 ++++++++++++++++++
   8  contrib/reverse-dns/reverse_dns.sh     | 29 +++++++++++++++++++++++++++++
   9  contrib/reverse-dns/reverse_replace.sh | 28 ++++++++++++++++++++++++++++
  10  3 files changed, 75 insertions(+)
  11  create mode 100644 contrib/reverse-dns/README
  12  create mode 100644 contrib/reverse-dns/reverse_dns.sh
  13  create mode 100644 contrib/reverse-dns/reverse_replace.sh
  14
  15 diff --git a/contrib/reverse-dns/README b/contrib/reverse-dns/README
  16 new file mode 100644
  17 index 000000000000..f87eb77c4c22
  18 --- /dev/null
  19 +++ b/contrib/reverse-dns/README
  20 @@ -0,0 +1,18 @@
  21 +Hi.
  22 +
  23 +To translate my routers netstat-nat output into names that actually talk
  24 +to me I have started writing to simple shell scripts. They require
  25 +
  26 +log-queries
  27 +log-facility=/var/log/dnsmasq.log
  28 +
  29 +to be set. With
  30 +
  31 +netstat-nat -n -4 | reverse_replace.sh
  32 +
  33 +I get retranslated output.
  34 +
  35 +Sincerely,
  36 +Joachim
  37 +
  38 +
  39 diff --git a/contrib/reverse-dns/reverse_dns.sh b/contrib/reverse-dns/reverse_dns.sh
  40 new file mode 100644
  41 index 000000000000..c0fff300a947
  42 --- /dev/null
  43 +++ b/contrib/reverse-dns/reverse_dns.sh
  44 @@ -0,0 +1,29 @@
  45 +#!/bin/bash
  46 +# $Id: reverse_dns.sh 4 2015-02-17 20:14:59Z jo $
  47 +#
  48 +# Usage: reverse_dns.sh IP
  49 +# Uses the dnsmasq query log to lookup the name
  50 +# that was last queried to return the given IP.
  51 +#
  52 +
  53 +IP=$1
  54 +qmIP=`echo $IP | sed 's#\.#\\.#g'`
  55 +LOG=/var/log/dnsmasq.log
  56 +
  57 +IP_regex='^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$'
  58 +
  59 +if ! [[ $IP =~ $IP_regex ]]; then
  60 +  echo -n $IP
  61 +  exit
  62 +fi
  63 +
  64 +NAME=`tac $LOG | \
  65 +  grep " is $IP" | head -1 | \
  66 +  sed "s#.* \([^ ]*\) is $qmIP.*#\1#" `
  67 +
  68 +if [ -z "$NAME" ]; then
  69 +  echo -n $IP
  70 +else
  71 +  echo -n $NAME
  72 +fi
  73 +
  74 diff --git a/contrib/reverse-dns/reverse_replace.sh b/contrib/reverse-dns/reverse_replace.sh
  75 new file mode 100644
  76 index 000000000000..a11c164b7f19
  77 --- /dev/null
  78 +++ b/contrib/reverse-dns/reverse_replace.sh
  79 @@ -0,0 +1,28 @@
  80 +#!/bin/bash
  81 +# $Id: reverse_replace.sh 4 2015-02-17 20:14:59Z jo $
  82 +#
  83 +# Usage e.g.: netstat -n -4 | reverse_replace.sh
  84 +# Parses stdin for IP4 addresses and replaces them
  85 +# with names retrieved by reverse_dns.sh
  86 +#
  87 +
  88 +DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
  89 +DNS=$DIR/reverse_dns.sh
  90 +
  91 +# sed regex
  92 +IP_regex='[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}'
  93 +
  94 +while read LINE; do
  95 +  if grep --quiet $IP_regex <<< "$LINE"; then
  96 +    IPs=`sed "s#.*\b\($IP_regex\)\b.*#\1 #g" <<< "$LINE"`
  97 +    IPs=($IPs)
  98 +    for IP in "${IPs[@]}"
  99 +    do
 100 +      NAME=`$DNS $IP`
 101 +      # echo "$NAME is $IP";
 102 +      LINE="${LINE/$IP/$NAME}"
 103 +    done
 104 +  fi
 105 +  echo $LINE
 106 +done < /dev/stdin
 107 +
 108 --
 109 2.1.0
 110