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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
82 lines
2.2 KiB
Go
82 lines
2.2 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 intercept
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import (
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"fmt"
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"github.com/michaelquigley/pfxlog"
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"github.com/openziti/edge/tunnel/dns"
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"github.com/openziti/edge/tunnel/utils"
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"net"
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)
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var dnsIpLow, dnsIpHigh net.IP
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func SetDnsInterceptIpRange(cidr string) error {
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ip, ipnet, err := net.ParseCIDR(cidr)
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if err != nil {
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return fmt.Errorf("invalid cidr %s: %v", cidr, err)
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}
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var ips []net.IP
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for ip = ip.Mask(ipnet.Mask); ipnet.Contains(ip); utils.IncIP(ip) {
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a := make(net.IP, len(ip))
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copy(a, ip)
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ips = append(ips, a)
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}
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// remove network address and broadcast address
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dnsIpLow = ips[1]
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dnsIpHigh = ips[len(ips)-2]
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if len(dnsIpLow) != len(dnsIpHigh) {
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return fmt.Errorf("lower dns IP length %d differs from upper dns IP length %d", len(dnsIpLow), len(dnsIpHigh))
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}
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pfxlog.Logger().Infof("dns intercept IP range: %s - %s", dnsIpLow.String(), dnsIpHigh.String())
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return nil
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}
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func getInterceptIP(hostname string, resolver dns.Resolver) (net.IP, error) {
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log := pfxlog.Logger()
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// hostname is an ip address, return it
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parsedIP := net.ParseIP(hostname)
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if parsedIP != nil {
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return parsedIP, nil
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}
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// - apparently not an IP address, assume hostname and attempt lookup:
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// - use first result if any
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// - pin first IP to hostname in resolver
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addrs, err := net.LookupIP(hostname)
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if err == nil {
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if len(addrs) > 0 {
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_ = resolver.AddHostname(hostname, addrs[0].To4())
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return addrs[0], nil
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}
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} else {
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log.Debugf("net.LookupIp(%s) failed: %s", hostname, err)
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}
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ip, _ := utils.NextIP(dnsIpLow, dnsIpHigh)
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if ip == nil {
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return nil, fmt.Errorf("invalid IP address or unresolvable hostname: %s", hostname)
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}
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_ = resolver.AddHostname(hostname, ip)
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return ip, nil
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}
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