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#!/bin/sh
# 6in4.sh - IPv6-in-IPv4 tunnel backend
# Copyright (c) 2010-2015 OpenWrt.org

[ -n "$INCLUDE_ONLY" ] || {
        . /lib/functions.sh
        . /lib/functions/network.sh
        . ../netifd-proto.sh
        init_proto "$@"
}

proto_6in4_update() {
        sh -c '
                timeout=5

                (while [ $((timeout--)) -gt 0 ]; do
                        sleep 1
                        kill -0 $$ || exit 0
                done; kill -9 $$) 2>/dev/null &

                exec "$@"
        ' "$1" "$@"
}

proto_6in4_add_prefix() {
        append "$3" "$1"
}

proto_6in4_setup() {
        local cfg="$1"
        local iface="$2"
        local link="6in4-$cfg"

        local mtu ttl tos ipaddr peeraddr ip6addr ip6prefix ip6prefixes tunlink tunnelid username password updatekey
        json_get_vars mtu ttl tos ipaddr peeraddr ip6addr tunlink tunnelid username password updatekey
        json_for_each_item proto_6in4_add_prefix ip6prefix ip6prefixes

        [ -z "$peeraddr" ] && {
                proto_notify_error "$cfg" "MISSING_ADDRESS"
                proto_block_restart "$cfg"
                return
        }

        ( proto_add_host_dependency "$cfg" "$peeraddr" "$tunlink" )

        [ -z "$ipaddr" ] && {
                local wanif="$tunlink"
                if [ -z "$wanif" ] && ! network_find_wan wanif; then
                        proto_notify_error "$cfg" "NO_WAN_LINK"
                        return
                fi

                if ! network_get_ipaddr ipaddr "$wanif"; then
                        proto_notify_error "$cfg" "NO_WAN_LINK"
                        return
                fi
        }

        proto_init_update "$link" 1

        [ -n "$ip6addr" ] && {
                local local6="${ip6addr%%/*}"
                local mask6="${ip6addr##*/}"
                [[ "$local6" = "$mask6" ]] && mask6=
                proto_add_ipv6_address "$local6" "$mask6"
                proto_add_ipv6_route "::" 0 "" "" "" "$local6/$mask6"
        }

        for ip6prefix in $ip6prefixes; do
                proto_add_ipv6_prefix "$ip6prefix"
                proto_add_ipv6_route "::" 0 "" "" "" "$ip6prefix"
        done

        proto_add_tunnel
        json_add_string mode sit
        json_add_int mtu "${mtu:-1280}"
        json_add_int ttl "${ttl:-64}"
        [ -n "$tos" ] && json_add_string tos "$tos"
        json_add_string local "$ipaddr"
        json_add_string remote "$peeraddr"
        [ -n "$tunlink" ] && json_add_string link "$tunlink"
        proto_close_tunnel

        proto_send_update "$cfg"

        [ -n "$tunnelid" -a -n "$username" -a \( -n "$password" -o -n "$updatekey" \) ] && {
                [ -n "$updatekey" ] && password="$updatekey"

                local http="http"
                local urlget="uclient-fetch"
                local urlget_opts="-qO-"
                local ca_path="${SSL_CERT_DIR:-/etc/ssl/certs}"

                [ -f /lib/libustream-ssl.so ] && http=https
                [ "$http" = "https" -a -z "$(find $ca_path -name "*.0" 2>/dev/null)" ] && {
                        urlget_opts="$urlget_opts --no-check-certificate"
                }

                local url="$http://ipv4.tunnelbroker.net/nic/update?hostname=$tunnelid"
                local try=0
                local max=3

                (
                        set -o pipefail
                        while [ $((++try)) -le $max ]; do
                                if proto_6in4_update $urlget $urlget_opts --user="$username" --password="$password" "$url" 2>&1 | \
                                        sed -e 's,^Killed$,timeout,' -e "s,^,update $try/$max: ," | \
                                        logger -t "$link";
                                then
                                        logger -t "$link" "updated"
                                        return 0
                                fi
                                sleep 5
                        done
                        logger -t "$link" "update failed"
                )
        }
}

proto_6in4_teardown() {
        local cfg="$1"
}

proto_6in4_init_config() {
        no_device=1
        available=1

        proto_config_add_string "ipaddr"
        proto_config_add_string "ip6addr"
        proto_config_add_array "ip6prefix"
        proto_config_add_string "peeraddr"
        proto_config_add_string "tunlink"
        proto_config_add_string "tunnelid"
        proto_config_add_string "username"
        proto_config_add_string "password"
        proto_config_add_string "updatekey"
        proto_config_add_int "mtu"
        proto_config_add_int "ttl"
        proto_config_add_string "tos"
}

[ -n "$INCLUDE_ONLY" ] || {
        add_protocol 6in4
}