first version

Author: hastmu

apt-proxy-detect.sh

@@ -0,0 +1,68 @@
+#!/bin/bash
+
+# (c)opyright by [email protected] 
+# checkout https://github.com/hastmu/apt-proxy-detect
+# v1 ... pure detect
+# v2 ... cache value with check
+
+function check_proxy() {
+   wget -e http_proxy=$1 -e https_proxy=$1 -qO - $2 >> /dev/null
+   return $?
+}
+
+cache_file="/tmp/.apt-proxy.$(id -un)"
+touch ${cache_file} >> /dev/null 2>&1
+skip_cache=0
+if [ "$(stat -c %u ${cache_file})" != "$(id -u)" ]
+then
+   skip_cache=1
+   echo "E: wrong owner of cache file ${cache_file}, remove or reown to $(id -un)" >&2
+fi
+service_name="_apt_proxy._tcp"
+[ -z "$1" ] && testurl="http://deb.debian.org/debian" || testurl="$1"
+
+if [ -s "${cache_file}" ] && [ ${skip_cache} -eq 0 ]
+then
+   proxy="$(cat ${cache_file})"
+   if check_proxy "${proxy}" "${testurl}"
+   then
+      echo "${proxy}"
+      exit 0
+   else
+      rm -f "${cache_file}"
+   fi
+fi
+
+T_FILE=$(mktemp)
+trap 'rm -f ${T_FILE}' EXIT
+avahi-browse -tcpr ${service_name} > ${T_FILE}
+if [ ! -s "${T_FILE}" ]
+then
+   # non cached
+   avahi-browse -tpr ${service_name} > ${T_FILE}
+fi
+
+for service in $(cat ${T_FILE} | grep "^+;")
+do
+   name="$(echo ${service} | cut -d\; -f4 | sed 's:\\032: :g')"
+   namef="$(echo ${service} | cut -d\; -f4)"
+   proxy="http://$(cat ${T_FILE} | grep "^=" | grep "$(echo ${namef} | sed 's:\\:\\\\:g')" | cut -d\; -f8,9 | tr ";" ":")"
+   if check_proxy ${proxy} ${testurl}
+   then
+      # ok 
+      if [ -z "${ret}" ]
+      then
+         ret="${proxy}"
+         if [ ${skip_cache} -eq 0 ] 
+         then
+            echo "${proxy}" > ${cache_file}
+         fi
+      fi
+      stat="OK"
+   else
+      stat="ER"
+   fi
+   printf "Service[%s][%s]@%s \n" "${stat}" "${name}" "${proxy}" >&2
+done
+
+echo "${ret}"