added network functions to new net.sh lib, moved set_system_proxy, begin of offline mode implementation
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177
lib/net.sh
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177
lib/net.sh
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# ------------------------------------------------------------------------------
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# Network functions
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# This file is part of the init.sh project
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# Copyright (c) 2022 Geoffray Levasseur <fatalerrors@geoffray-levasseur.org>
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# ------------------------------------------------------------------------------
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# This file is distributed under 3-clause BSD license.
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# The complete license agreement can be obtained at:
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# https://opensource.org/licenses/BSD-3-Clause
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# ------------------------------------------------------------------------------
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# Network interfaces list
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export IF_LIST=''
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# IPv4 vars:
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export DEF_IP4=''
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export DEF_CIDR4=''
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export DEF_NETMASK4=''
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export DEF_ROUTE4=''
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# IPv6 vars
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export DEF_IP6=''
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export DEF_CIDR6=''
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export DEF_ROUTE6=''
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# ------------------------------------------------------------------------------
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# Set system proxy vars
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set_system_proxy()
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{
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# Declare proxy system vars if needed and if not already declared
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if [[ -n $PROXY_SRV && -n $PROXY_SRV_PORT && -z $NO_PROXY ]]; then
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export http_proxy=${http_proxy:-"http://$PROXY_SRV:$PROXY_SRV_PORT/"}
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export https_proxy=${https_proxy:-"http://$PROXY_SRV:$PROXY_SRV_PORT/"}
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fi
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}
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export -f set_system_proxy
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# ------------------------------------------------------------------------------
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# Convert a netmask to a CIDR notation (IPv4)
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mask2cidr4()
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{
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# Assumes there's no "255." after a non-255 byte in the mask
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local x=${1##*255.}
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set -- 0^^^128^192^224^240^248^252^254^ $(( (${#1} - ${#x})*2 )) ${x%%.*}
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x=${1%%$3*}
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echo $(( $2 + (${#x}/4) ))
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}
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export -f mask2cidr4
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# ------------------------------------------------------------------------------
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# Convert a CIDR notation to a netmask (IPv4)
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cidr2mask4()
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{
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# Number of args to shift, 255..255, first non-255 byte, zeroes
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set -- $(( 5 - ($1 / 8) )) 255 255 255 255 $(( (255 << (8 - ($1 % 8))) & 255 )) 0 0 0
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[[ $1 -gt 1 ]] && shift $1 || shift
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echo ${1-0}.${2-0}.${3-0}.${4-0}
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}
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export -f cidr2mask4
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# ------------------------------------------------------------------------------
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# Determine if parameter is a valid IPv4 address
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isipv4 ()
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{
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# Set up local variables
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local ip=$1
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# Start with a regex format test
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if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
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local old_ifs=$IFS
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IFS="."
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ip=($ip)
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IFS=$old_ifs
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if [[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
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&& ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]; then
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return 0
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fi
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fi
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return 1
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}
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export -f isipv4
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# ------------------------------------------------------------------------------
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# Determine if parameter is a valid IPv4 address
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isipv6 ()
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{
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local ip="$1"
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local regex='^([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}$'
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if [[ $ip =~ $regex ]]; then
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return 0
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fi
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return 1
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}
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export -f isipv6
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# ------------------------------------------------------------------------------
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# Extract network information
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get_network_info()
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{
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# Get info on v4 net first
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export DEF_ROUTE4=$(ip route | awk '/default/ { print $3 }')
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export DEF_IF4=$(ip route | awk '/default/ { print $5 }')
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export DEF_IP4=$(ip -o route get 1.1.1.1 | cut -d " " -f 7)
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export DEF_CIDR4=$(ip addr show | grep -w inet | grep -v 127.0.0.1 | \
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awk '{ print $2}' | cut -d "/" -f 2)
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export DEF_NETMASK4=$(cidr2mask4 $DEF_CIDR4)
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export IP4_LIST=$(ip addr show | grep -w inet | grep -v 127.0.0.1 | \
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awk '{ print $2}' | cut -d "/" -f 1)
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# Now get v6 net infos
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export DEF_ROUTE6=$(ip -6 route | awk '/default/ { print $3 }')
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export DEF_IF6=$(ip -6 route | awk '/default/ { print $5 }')
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export DEF_IP6=$(ip -6 -o route get 2001:503:ba3e::2:30 | cut -d " " -f 11)
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export DEF_CIDR6=$(ip addr show | grep -w inet6 | grep -v ::1 | \
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awk 'FNR==1 { print $2}' | cut -d "/" -f 2)
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export IP6_LIST=$(ip addr show | grep -w inet6 | grep -v ::1 | \
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awk '{ print $2}' | cut -d "/" -f 1)
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for iface in $(ip -o -4 addr list | awk '{print $2}' | tr '\n' ' '); do
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export IF_LIST=$(trim "$IF_LIST $iface")
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ipaddr=$(ip -o -4 addr list $iface | awk '{print $4}' | cut -d/ -f1)
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export IP4_LIST
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done
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for iface in $(ip -o -6 addr list | awk '{print $2}' | tr '\n' ' '); do
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if [[ ! $(echo $IF_LIST | grep $iface) ]]; then
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export IF_LIST=$(trim "$IF_LIST $iface")
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fi
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ipaddr=$(ip -o -6 addr list $iface | awk '{print $4}' | cut -d/ -f1)
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export IP4_LIST
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done
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}
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export -f get_network_info
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# ------------------------------------------------------------------------------
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# Check availability of different aspect of the network
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check_network()
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{
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case $1 in
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"print")
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if [[ -n $DEF_IP4 ]]; then
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prnt I "Your default (routed) address is: $DEF_IP4/$DEF_CIDR4 ($DEF_NETMASK4) on $DEF_IF4"
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prnt I "Your default IPv4 route is: $DEF_ROUTE4"
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fi
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if [[ -n $DEF_IP6 ]]; then
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prnt I "Your default (routed) IPv6 address is: $DEF_IP6/$DEF_CIDR6 on $DEF_IF6"
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prnt I "Your default IPv6 route is: $DEF_ROUTE6"
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fi
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prnt I "Here is the full list of detected v4 addresses:"
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echo -e " +------------+-------------------------------------------+"
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echo -e " | Interface | IP Address |"
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echo -e " +------------+-------------------------------------------+"
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for iface in $IF_LIST; do
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ipaddr=$(ip -o -4 addr list $iface | awk '{print $4}')
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for addr in $ipaddr; do
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printf " |%11s | %-42s|\n" $iface $addr
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done
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ipaddr=$(ip -o -6 addr list $iface | awk '{print $4}')
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for addr in $ipaddr; do
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printf " |%11s | %-42s|\n" $iface $addr
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done
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done
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echo " +------------+-------------------------------------------+"
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;;
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"lan")
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return 0
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;;
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"ternet")
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return 0
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;;
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esac
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}
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export -f check_network
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