3fb8dcfd4c
* Increase entroy from 2 bytes to 7 bytes to prevent collisions * Extract common library function for hash with prefix * Refactor portmap plugin to use library function fixes #347 Co-authored-by: Cameron Moreau <cmoreau@pivotal.io> Co-authored-by: Mikael Manukyan <mmanukyan@pivotal.io>
109 lines
2.5 KiB
Go
109 lines
2.5 KiB
Go
// Copyright 2017 CNI authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package main
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import (
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"fmt"
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"net"
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"strconv"
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"strings"
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"github.com/vishvananda/netlink"
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)
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// fmtIpPort correctly formats ip:port literals for iptables and ip6tables -
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// need to wrap v6 literals in a []
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func fmtIpPort(ip net.IP, port int) string {
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if ip.To4() == nil {
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return fmt.Sprintf("[%s]:%d", ip.String(), port)
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}
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return fmt.Sprintf("%s:%d", ip.String(), port)
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}
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func localhostIP(isV6 bool) string {
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if isV6 {
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return "::1"
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}
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return "127.0.0.1"
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}
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// getRoutableHostIF will try and determine which interface routes the container's
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// traffic. This is the one on which we disable martian filtering.
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func getRoutableHostIF(containerIP net.IP) string {
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routes, err := netlink.RouteGet(containerIP)
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if err != nil {
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return ""
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}
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for _, route := range routes {
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link, err := netlink.LinkByIndex(route.LinkIndex)
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if err != nil {
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continue
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}
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return link.Attrs().Name
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}
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return ""
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}
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// groupByProto groups port numbers by protocol
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func groupByProto(entries []PortMapEntry) map[string][]int {
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if len(entries) == 0 {
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return map[string][]int{}
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}
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out := map[string][]int{}
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for _, e := range entries {
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_, ok := out[e.Protocol]
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if ok {
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out[e.Protocol] = append(out[e.Protocol], e.HostPort)
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} else {
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out[e.Protocol] = []int{e.HostPort}
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}
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}
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return out
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}
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// splitPortList splits a list of integers in to one or more comma-separated
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// string values, for use by multiport. Multiport only allows up to 15 ports
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// per entry.
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func splitPortList(l []int) []string {
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out := []string{}
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acc := []string{}
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for _, i := range l {
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acc = append(acc, strconv.Itoa(i))
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if len(acc) == 15 {
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out = append(out, strings.Join(acc, ","))
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acc = []string{}
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}
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}
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if len(acc) > 0 {
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out = append(out, strings.Join(acc, ","))
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}
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return out
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}
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// trimComment makes sure no comment is over the iptables limit of 255 chars
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func trimComment(val string) string {
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if len(val) <= 255 {
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return val
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}
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return val[0:253] + "..."
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}
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