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// Copyright (C) 2018 Nippon Telegraph and Telephone Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gobgpapi
import (
"fmt"
"regexp"
"strconv"
"strings"
"github.com/osrg/gobgp/packet/bgp"
)
var (
repexpCommunity = regexp.MustCompile("(\\d+.)*\\d+:\\d+")
regexpLargeCommunity = regexp.MustCompile("\\d+:\\d+:\\d+")
)
func ParseCommunityRegexp(arg string) (*regexp.Regexp, error) {
i, err := strconv.ParseUint(arg, 10, 32)
if err == nil {
return regexp.Compile(fmt.Sprintf("^%d:%d$", i>>16, i&0x0000ffff))
}
if repexpCommunity.MatchString(arg) {
return regexp.Compile(fmt.Sprintf("^%s$", arg))
}
for i, v := range bgp.WellKnownCommunityNameMap {
if strings.Replace(strings.ToLower(arg), "_", "-", -1) == v {
return regexp.Compile(fmt.Sprintf("^%d:%d$", i>>16, i&0x0000ffff))
}
}
exp, err := regexp.Compile(arg)
if err != nil {
return nil, fmt.Errorf("invalid community format: %s", arg)
}
return exp, nil
}
func ParseExtCommunityRegexp(arg string) (bgp.ExtendedCommunityAttrSubType, *regexp.Regexp, error) {
var subtype bgp.ExtendedCommunityAttrSubType
elems := strings.SplitN(arg, ":", 2)
if len(elems) < 2 {
return subtype, nil, fmt.Errorf("invalid ext-community format([rt|soo]:<value>)")
}
switch strings.ToLower(elems[0]) {
case "rt":
subtype = bgp.EC_SUBTYPE_ROUTE_TARGET
case "soo":
subtype = bgp.EC_SUBTYPE_ROUTE_ORIGIN
default:
return subtype, nil, fmt.Errorf("unknown ext-community subtype. rt, soo is supported")
}
exp, err := ParseCommunityRegexp(elems[1])
return subtype, exp, err
}
func ParseLargeCommunityRegexp(arg string) (*regexp.Regexp, error) {
if regexpLargeCommunity.MatchString(arg) {
return regexp.Compile(fmt.Sprintf("^%s$", arg))
}
exp, err := regexp.Compile(arg)
if err != nil {
return nil, fmt.Errorf("invalid large-community format: %s", arg)
}
return exp, nil
}
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