Initial commit.

bits/other-peoples/inifile.bash

@@ -0,0 +1,234 @@
+#!@BASH_PATH@
+# Author: Jack L. Frost <fbt@fleshless.org>
+# Licensed under the Internet Software Consortium (ISC) license.
+# See LICENSE for its text.
+
+_self="${0##*/}"
+
+err() { printf '%s\n' "$*" >&2; }
+
+debug() {
+	(( $flag_debug )) && { printf '%s\n' "DEBUG: $*"; }
+}
+
+usage() {
+	while read; do printf '%s\n' "$REPLY"; done <<- EOF
+		Usage: $_self [flags]
+		Flags:
+		        -h|--help            Show this message.
+		        -c|--config <file>   Use a config specified by <file>.
+		        -d|--debug           Enable debug messages.
+	EOF
+}
+
+cfg_load() {
+	declare section line key value
+	declare -g -A cfg
+
+	mapfile -t config < "$1"
+
+	for line in "${config[@]}"; do
+		if [[ "$line" =~ ^\[.+\] ]]; then
+			section="${line//[\[\]]/}"
+
+			case "$section" in
+				main) :;;
+				*) ifaces+=( "${line//[\[\]]/}" );;
+			esac
+		elif [[ "$line" =~ ^('#'|\s+?$) ]]; then
+			:
+		else
+			IFS='=' read -r key value <<< "$line"
+
+			if ! [[ "$section" ]]; then
+				err "Key $key does not belong to a section!"
+				return 1
+			fi
+
+			if [[ "$key" ]]; then
+				if ! [[ "$value" ]]; then
+					value=1
+				fi
+
+				if [[ ${cfg[${section}_$key]} ]]; then
+					declare -g cfg["${section}_$key"]="${cfg[${section}_$key]}#${value}"
+				else
+					declare -g cfg["${section}_$key"]="$value"
+				fi
+			fi
+		fi
+	done
+}
+
+net_up() {
+	for iface in "${ifaces[@]}"; do
+		# Prepare the interface
+		if [[ "${cfg[${iface}_preup]}" ]]; then
+			${cfg[${iface}_preup]}
+		fi
+
+		# Bring the interface up
+		if [[ "${cfg[${iface}_up]}" ]]; then
+			${cfg[${iface}_up]}
+		else
+			if [[ "${cfg[${iface}_vlan_dev]}" ]]; then
+				ip link add link "${cfg[${iface}_vlan_dev]}" name "$iface" type vlan id "${cfg[${iface}_vlan_id]}"
+			fi
+
+			ip link set "$iface" up
+		fi
+
+		# Add IPs
+		if [[ "${cfg[${iface}_ip]}" ]]; then
+			IFS='#' read -r -a ips <<< "${cfg[${iface}_ip]}"
+
+			for a in "${ips[@]}"; do
+				ip addr add "$a" dev "$iface"
+			done
+		fi
+
+		# Configure the interface with dhcp if needed
+		if [[ "${cfg[${iface}_dhcp]}" ]]; then
+			${cfg[main_dhcp_up]} "$iface"
+		fi
+
+		# Add routes
+		if [[ "${cfg[${iface}_route]}" ]]; then
+			IFS='#' read -r -a routes <<< "${cfg[${iface}_route]}"
+
+			for r in "${routes[@]}"; do
+				read -r net gw <<< "$r"
+
+				ip route add "$net" via "$gw"
+			done
+		fi
+
+		if [[ "${cfg[${iface}_postup]}" ]]; then
+			${cfg[${iface}_up]}
+		fi
+	done
+}
+
+net_down() {
+	for iface in "${ifaces[@]}"; do
+		# Prepare the interface
+		if [[ "${cfg[${iface}_predown]}" ]]; then
+			${cfg[${iface}_predown]}
+		fi
+
+		# Remove routes
+		if [[ "${cfg[${iface}_route]}" ]]; then
+			IFS='#' read -r -a routes <<< "${cfg[${iface}_route]}"
+
+			for r in "${routes[@]}"; do
+				read -r net gw <<< "$r"
+
+				ip route del "$net" via "$gw"
+			done
+		fi
+
+		# Stop dhcpcd
+		if [[ "${cfg[${iface}_dhcp]}" ]]; then
+			${cfg[main_dhcp_down]} "$iface"
+		fi
+
+		# Remove IPs
+		if [[ "${cfg[${iface}_ip]}" ]]; then
+			IFS='#' read -r -a ips <<< "${cfg[${iface}_ip]}"
+
+			for a in "${ips[@]}"; do
+				ip addr del "$a" dev "$iface"
+			done
+		fi
+
+		# Bring the interface down
+		if [[ "${cfg[${iface}_down]}" ]]; then
+			${cfg[${iface}_down]}
+		else
+			ip link set "$iface" down
+			
+			if [[ "${cfg[${iface}_vlan_dev]}" ]]; then
+				ip link del "$iface"
+			fi
+		fi
+
+		if [[ "${cfg[${iface}_postdown]}" ]]; then
+			${cfg[${iface}_postdown]}
+		fi
+	done
+}
+
+set_argv() {
+	declare arg opt c
+	declare -g argv
+
+	while (( $# )); do
+		unset -v arg opt c
+
+		case "$1" in
+			(--) argv+=( "$1" ); break;;
+
+			(--*)
+				IFS='=' read arg opt <<< "$1"
+				argv+=( "$arg" )
+
+				[[ "$opt" ]] && {
+					argv+=( "$opt" )
+				}
+			;;
+
+			(-*)
+				while read -n1 c
+				do
+					case "$c" in
+						-|'') :;;
+						*) argv+=( "-$c" );;
+					esac
+				done <<< "$1"
+			;;
+
+			(*) argv+=( "$1" );;
+		esac
+		shift
+	done
+}
+
+main() {
+	while (( $# )); do
+		case "$1" in
+			-h|--help) usage; return 0;;
+			-d|--debug)
+				flag_debug=1
+				debug "Debug flag set."
+			;;
+			-c|--config) cfg_file="$2"; shift;;
+
+			--) shift; break;;
+			-*)
+				err "Unknown key: $1"
+				usage
+				return 1
+			;;
+			*) break;;
+		esac
+		shift
+	done
+
+	if ! [[ "$cfg_file" ]]; then
+		cfg_file='@CONFDIR@/networking'
+	fi
+
+	cfg_load "$cfg_file" || {
+		return "$?"
+	}
+
+	action=${1:-"up"}
+
+	case "$action" in
+		up) net_up;;
+		down) net_down;;
+	esac
+}
+
+set_argv "$@"
+main "${argv[@]}"