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https://github.com/openziti/ziti.git
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Shawn Carey
b352ecbfae
* use shared network IP range for services that are configured with unresolvable hostnames * parameterize dns intercept IP range * reuse utils.incIP closes #339
55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
/*
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Copyright NetFoundry, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package utils
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import (
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"net"
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)
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// return the next available IP address in the range of provided IPs
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func NextIP(lower, upper net.IP) (net.IP, error) {
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usedAddrs, err := AllInterfaceAddrs()
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if err != nil {
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return nil, err
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}
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for ip := lower; !ip.Equal(upper); IncIP(ip) {
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inUse := false
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for _, usedAddr := range usedAddrs {
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usedIP, _, _ := net.ParseCIDR(usedAddr.String())
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if ip.Equal(usedIP) {
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inUse = true
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break
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}
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}
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if !inUse {
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return ip, nil
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}
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}
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return nil, nil
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}
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func IncIP(ip net.IP) {
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for i := len(ip) - 1; i >= 0; i-- {
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ip[i]++
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if ip[i] > 0 {
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break
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}
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}
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}
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