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utils.go
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utils.go
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/*
* Copyright (c) 2017, Psiphon Inc.
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package tun
import (
std_errors "errors"
"fmt"
"net"
"strconv"
"github.com/Psiphon-Labs/psiphon-tunnel-core/psiphon/common/errors"
)
var errUnsupported = std_errors.New("operation unsupported on this platform")
func splitIPMask(IPAddressCIDR string) (string, string, error) {
IP, IPNet, err := net.ParseCIDR(IPAddressCIDR)
if err != nil {
return "", "", errors.Trace(err)
}
var netmask string
IPv4Mask := net.IP(IPNet.Mask).To4()
if IPv4Mask != nil {
netmask = fmt.Sprintf(
"%d.%d.%d.%d", IPv4Mask[0], IPv4Mask[1], IPv4Mask[2], IPv4Mask[3])
} else {
netmask = IPNet.Mask.String()
}
return IP.String(), netmask, nil
}
func splitIPPrefixLen(IPAddressCIDR string) (string, string, error) {
IP, IPNet, err := net.ParseCIDR(IPAddressCIDR)
if err != nil {
return "", "", errors.Trace(err)
}
prefixLen, _ := IPNet.Mask.Size()
return IP.String(), strconv.Itoa(prefixLen), nil
}
func getMTU(configMTU int) int {
if configMTU <= 0 {
return DEFAULT_MTU
} else if configMTU > 65536 {
return 65536
}
return configMTU
}