ghetto mbimcli --query-ip-configuration IP information parser to create iproute2 + resolvconf configuration

mbimcli_ip_parser.sh

#!/bin/bash

DEV="wwp0s20f0u3i12"
ARG="$1"

previous_state="none"
state="start"
skip_line=0
ipv4_addresses=()
ipv4_gateway=""
ipv4_dns=()
ipv4_mtu=""
ipv6_addresses=()
ipv6_gateway=""
ipv6_dns=()
ipv6_mtu=""

function print {
	: #echo "[$state] $1"
}

function next_state {
	previous_state="$state"
	state="$1"
}

function parse_ip {
	#      IP [0]: '10.134.203.177/30'
	local line_re="IP \[([0-9]+)\]: '(.+)'"
	local input=$1
	if [[ $input =~ $line_re ]]; then
		local ip_cnt=${BASH_REMATCH[1]}
		local ip=${BASH_REMATCH[2]}
	fi
	echo "$ip"
}

function parse_dns {
	#      IP [0]: '10.134.203.177/30'
	local line_re="DNS \[([0-9]+)\]: '(.+)'"
	local input=$1
	if [[ $input =~ $line_re ]]; then
		local dns_cnt=${BASH_REMATCH[1]}
		local dns=${BASH_REMATCH[2]}
	fi
	echo "$dns"
}

function parse_gateway {
	#    Gateway: '10.134.203.178'
	local line_re="Gateway: '(.+)'"
	local input=$1
	if [[ $input =~ $line_re ]]; then
		local gw=${BASH_REMATCH[1]}
	fi
	echo "$gw"
}

function parse_mtu {
	#        MTU: '1500'
	local line_re="MTU: '([0-9]+)'"
	local input=$1
	if [[ $input =~ $line_re ]]; then
		local mtu=${BASH_REMATCH[1]}
	fi
	echo "$mtu"
}

while true; do
	if [[ "$skip_line" == 0 ]]; then
		read line
	else
		skip_line=0
	fi
	case "$state" in
		"start")
			read line # first line is empty, read a new one
			case "$line" in
				*"IPv4 configuration available"*)
					next_state "ipv4_ip"
					continue
					;;
				*"IPv6 configuration available"*)
					next_state "ipv6_ip"
					continue
					;;
				*)
					next_state "exit"
					continue
					;;
			esac
			;;
		"error")
			print "Error in state $previous_state. Exiting."
			exit 0
			;;
		"exit")
			break
			;;
		"ipv4_ip")
			ipv4=$(parse_ip "$line")
			if [ -z "$ipv4" ]; then
				if [[ "${#ipv4_addresses[@]}" < 1 ]]; then
					next_state "error"
					continue
				else
					next_state "ipv4_gateway"
					skip_line=1
					continue
				fi
			fi
			print "$ipv4"
			ipv4_addresses+=("$ipv4")
			;;
		"ipv4_gateway")
			gw=$(parse_gateway "$line")
			if [ -z "$gw" ]; then
				next_state "error"
				continue
			fi
			print "$gw"
			ipv4_gateway="$gw"
			next_state "ipv4_dns"
			;;
		"ipv4_dns")
			ipv4=$(parse_dns "$line")
			if [ -z "$ipv4" ]; then
				if [[ "${#ipv4_dns[@]}" < 1 ]]; then
					next_state "error"
					continue
				else
					next_state "ipv4_mtu"
					skip_line=1
					continue
				fi
			fi
			print "$ipv4"
			ipv4_dns+=("$ipv4")
			;;
		"ipv4_mtu")
			mtu=$(parse_mtu "$line")
			if [ -z "$mtu" ]; then
				next_state "error"
				continue
			fi
			print "$mtu"
			ipv4_mtu="$mtu"
			next_state "start"
			;;
		"ipv6_ip")
			ipv6=$(parse_ip "$line")
			if [ -z "$ipv6" ]; then
				if [[ "${#ipv6_addresses[@]}" < 1 ]]; then
					next_state "error"
					continue
				else
					next_state "ipv6_gateway"
					skip_line=1
					continue
				fi
			fi
			print "$ipv6"
			ipv6_addresses+=("$ipv6")
			;;
		"ipv6_gateway")
			gw=$(parse_gateway "$line")
			if [ -z "$gw" ]; then
				next_state "error"
				continue
			fi
			print "$gw"
			ipv6_gateway="$gw"
			next_state "ipv6_dns"
			;;
		"ipv6_dns")
			ipv6=$(parse_dns "$line")
			if [ -z "$ipv6" ]; then
				if [[ "${#ipv6_dns[@]}" < 1 ]]; then
					next_state "error"
					continue
				else
					next_state "ipv6_mtu"
					skip_line=1
					continue
				fi
			fi
			print "$ipv6"
			ipv6_dns+=("$ipv6")
			;;
		"ipv6_mtu")
			mtu=$(parse_mtu "$line")
			if [ -z "$mtu" ]; then
				next_state "error"
				continue
			fi
			print "$mtu"
			ipv6_mtu="$mtu"
			next_state "start"
			;;
		*)
			print "Invalid state (came from $previous_state). Exiting."
			exit 0
			;;
	esac
done

if [[ "${#ipv4_addresses[@]}" > 0 ]]; then
	printf "IPv4: "
	printf '%s, ' "${ipv4_addresses[@]}"
	printf "\n"

	printf "GW: $ipv4_gateway\n"

	printf "DNS: "
	printf '%s, ' "${ipv4_dns[@]}"
	printf "\n"

	printf "MTU: $ipv4_mtu\n"
fi

if [[ "${#ipv6_addresses[@]}" > 0 ]]; then
	echo
	printf "IPv6: "
	printf '%s, ' "${ipv6_addresses[@]}"
	printf "\n"

	printf "GW: $ipv6_gateway\n"

	printf "DNS: "
	printf '%s, ' "${ipv6_dns[@]}"
	printf "\n"

	printf "MTU: $ipv6_mtu\n"
fi

execfile=$(mktemp)
dnsfile=$(mktemp)

printf "ip link set $DEV up\n" >> $execfile
if [[ "${#ipv4_addresses[@]}" > 0 ]]; then
	printf "ip addr add %s dev $DEV broadcast +\n" "${ipv4_addresses[@]}" >> $execfile
	printf "ip link set $DEV mtu $ipv4_mtu\n" >> $execfile
	printf "ip route add default via $ipv4_gateway dev $DEV\n" >> $execfile
	printf "nameserver %s\n" "${ipv4_dns[@]}" >> $dnsfile
fi

if [[ "${#ipv6_addresses[@]}" > 0 ]]; then
	printf "ip -6 addr add %s dev $DEV\n" "${ipv6_addresses[@]}" >> $execfile
	printf "ip -6 route add default via $ipv6_gateway dev $DEV\n" >> $execfile
	printf "ip -6 link set $DEV mtu $ipv6_mtu\n" >> $execfile
	printf "nameserver %s\n" "${ipv6_dns[@]}" >> $dnsfile
fi

case "$ARG" in
	"-a")
		;;
	"-p")
		cat $execfile
		rm $execfile
		rm $dnsfile
		exit 0
		;;
	*)
		echo "USAGE: $0 -a|-p"
		echo "-a: Apply iproute2 and DNS config"
		echo "-p: Pretend (and display) iproute2 config"
		rm $execfile
		exit 0
		;;
esac

echo "Applying config..."
bash $execfile

resolvconf -a $DEV.inet -u <$dnsfile

rm $execfile
rm $dnsfile