colorize-log.sh

#!/bin/sh

red="$(tput setaf 1)" green="$(tput setaf 2)" blue="$(tput setaf 4)"
sg0="$(tput sgr0)" ul="$(tput smul)" b="$(tput bold)"
dq='"'

sed -ur \
  -e '/^==>/d' \
  -e '/^[[:space:]]*$/d' \
  -e 's/^.*\[ *[.0-9]*\] //' \
  -e 's/ - - \[[^]]* [+-][0-9]\+\]//' \
  -e 's/^[[:space:]]*//' \
  -e 's/(MAC|PHYSIN|TOS|PREC|ID|WINDOW|RES|URGP)=[^[:space:]]* //g' \
  -e "s/(SPT|DPT|SRC|DST)=([^[:space:]]*)/${blue}\\1=${b}\\2${sg0}/g" \
  -e "s/(POST|GET|HEAD|OPTIONS|CONNECT) [^[:space:]]*/${b}${blue}&${sg0}/g" \
  -e "s/([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])/${b}&${sg0}/g" \
  -e "s/[[:alpha:]]\{3,10\}:\/\/[^\/]*\/[[:alnum:]?/&=%;_\.-]*/${ul}&${sg0}/g" \
  -e "s/( - )([^[:space:]]\{,12\})( \[)/\\1${ul}${b}\\2${sg0}\\3/" \
  -e "s/\b[a-zA-Z0-9._%+-]\+@[a-zA-Z0-9.-]\+\.[A-Za-z]\{2,4\}\b/${ul}&${sg0}/g" \
  -e "s/\[(notice|info|debug)\]/${blue}&${sg0}/g" \
  -e "s/\[(crit|err|error|warn|warning)\]/${red}&${sg0}/g" \
  -e "s/[^[:space:]]*(DENIED|DROP|REJECT)/${red}${b}&${sg0}/g" \
  -e "s/(\" )([45][0-9][0-9]) /\\1${b}${red}\\2${sg0} /g" \
  -e "s/[^[:space:]]*(TCP_MISS|ACCEPT)/${green}&${sg0}/g" \
  -e "s/(\" )([123][0-9][0-9]) /\\1${green}\\2${sg0} /g"