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// Copyright 2017 CNI 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 main
import (
"fmt"
"net"
"strconv"
"strings"
"github.com/vishvananda/netlink"
)
// fmtIpPort correctly formats ip:port literals for iptables and ip6tables -
// need to wrap v6 literals in a []
func fmtIpPort(ip net.IP, port int) string {
if ip.To4() == nil {
return fmt.Sprintf("[%s]:%d", ip.String(), port)
}
return fmt.Sprintf("%s:%d", ip.String(), port)
}
func localhostIP(isV6 bool) string {
if isV6 {
return "::1"
}
return "127.0.0.1"
}
// getRoutableHostIF will try and determine which interface routes the container's
// traffic. This is the one on which we disable martian filtering.
func getRoutableHostIF(containerIP net.IP) string {
routes, err := netlink.RouteGet(containerIP)
if err != nil {
return ""
}
for _, route := range routes {
link, err := netlink.LinkByIndex(route.LinkIndex)
if err != nil {
continue
}
return link.Attrs().Name
}
return ""
}
// groupByProto groups port numbers by protocol
func groupByProto(entries []PortMapEntry) map[string][]int {
if len(entries) == 0 {
return map[string][]int{}
}
out := map[string][]int{}
for _, e := range entries {
_, ok := out[e.Protocol]
if ok {
out[e.Protocol] = append(out[e.Protocol], e.HostPort)
} else {
out[e.Protocol] = []int{e.HostPort}
}
}
return out
}
// splitPortList splits a list of integers in to one or more comma-separated
// string values, for use by multiport. Multiport only allows up to 15 ports
// per entry.
func splitPortList(l []int) []string {
out := []string{}
acc := []string{}
for _, i := range l {
acc = append(acc, strconv.Itoa(i))
if len(acc) == 15 {
out = append(out, strings.Join(acc, ","))
acc = []string{}
}
}
if len(acc) > 0 {
out = append(out, strings.Join(acc, ","))
}
return out
}
// trimComment makes sure no comment is over the iptables limit of 255 chars
func trimComment(val string) string {
if len(val) <= 255 {
return val
}
return val[0:253] + "..."
}
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