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filtered.go
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filtered.go
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/*
*
* * Copyright 2021 KubeClipper Authors.
* *
* * 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 autodetection
import (
"errors"
"fmt"
"net"
)
// DefaultInterfacesToExclude Default interfaces to exclude for any logic following the first-found
// autodetect IP method
var DefaultInterfacesToExclude = []string{
"docker.*", "cbr.*", "dummy.*",
"virbr.*", "lxcbr.*", "veth.*", "lo",
"vxlan.calico", "cali.*", "tunl.*", "flannel.*", "kube-ipvs.*", "cni.*",
}
// FilteredEnumeration performs basic IP and IPNetwork discovery by enumerating
// all interfaces and filtering in/out based on the supplied filter regex.
//
// The incl and excl slice of regex strings may be nil.
func FilteredEnumeration(incl, excl []string, cidrs []net.IPNet, version int) (*Interface, *net.IPNet, error) {
interfaces, err := GetInterfaces(incl, excl, version)
if err != nil {
return nil, nil, err
}
if len(interfaces) == 0 {
return nil, nil, errors.New("no valid host interfaces found")
}
// Find the first interface with a valid matching IP address and network.
// We initialise the IP with the first valid IP that we find just in
// case we don't find an IP and network.
for _, i := range interfaces {
for _, c := range i.Cidrs {
if c.IP.IsGlobalUnicast() && matchCIDRs(c.IP, cidrs) {
return &i, &c, nil
}
}
}
return nil, nil, fmt.Errorf("no valid IPv%d addresses found on the host interfaces", version)
}
// matchCIDRs matches an IP address against a list of cidrs.
// If the list is empty, it always matches.
func matchCIDRs(ip net.IP, cidrs []net.IPNet) bool {
if len(cidrs) == 0 {
return true
}
for _, cidr := range cidrs {
if cidr.Contains(ip) {
return true
}
}
return false
}