origin dnsname commit

Signed-off-by: baude <[email protected]>

Author: baude

README.md

@@ -1,2 +1,44 @@
-# dnsname
-name resolution for containers
+# dnsname plugin
+
+## Overview
+
+This plugin creates firewall rules to allow traffic to/from container IP address via the host network .
+It does not create any network interfaces and therefore does not set up connectivity by itself.
+It is intended to be used as a chained plugins.
+
+This plugin sets up the use of dnsmasq on a given CNI network so that Pods can resolve each other by name.  When configured,
+the pod and its IP address are added to a network specific hosts file that dnsmasq will read in.  Similarly, when a pod
+is removed from the network, it will remove the entry from the hosts file.  Each CNI network will have its own dnsmasq
+instance.
+
+## Usage
+The dnsname plugin can be enabled in the cni network configuration file.
+
+```
+{
+    "cniVersion": "0.4.0",
+    "name": "cni-bridge-network",
+    "plugins": [
+      {
+        "type": "bridge",
+        "bridge": "cni0",
+        ...
+        }
+      },
+      {
+        "type": "dnsname",
+        "domainName": "foobar.com"
+      }
+    ]
+}
+```
+
+## DNSMasq configuration files
+The dnsmasq service and its configuration files are considered to be very fluid and are not meant to survive a system
+reboot.  Therefore, files are stored in `/run/containers/cni/dnsname`. The plugin knows to recreate the necessary
+files if it detects they are not present.
+
+##  DNSMasq default configuration
+Much like the implementation of DNSMasq for libvirt, this plugin will only set up dnsmasq to listen on the network
+interfaces associated with the CNI network.  The DNSMasq services are not configured or managed by systemd but rather
+only by the plugin itself.

build_linux.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -e
+cd $(dirname "$0")
+
+if [ "$(uname)" == "Darwin" ]; then
+	export GOOS="${GOOS:-linux}"
+fi
+
+ORG_PATH="github.com/containers"
+export REPO_PATH="${ORG_PATH}/dnsname"
+
+if [ ! -h gopath/src/${REPO_PATH} ]; then
+	mkdir -p gopath/src/${ORG_PATH}
+	ln -s ../../../.. gopath/src/${REPO_PATH} || exit 255
+fi
+
+export GOPATH=${PWD}/gopath
+export GO="${GO:-go}"
+export GOFLAGS="${GOFLAGS} -mod=vendor"
+
+mkdir -p "${PWD}/bin"
+
+echo "Building plugins ${GOOS}"
+PLUGINS="plugins/meta/* plugins/main/* plugins/ipam/*"
+for d in $PLUGINS; do
+	if [ -d "$d" ]; then
+		plugin="$(basename "$d")"
+		if [ $plugin != "windows" ]; then
+			echo "  $plugin"
+			$GO build -o "${PWD}/bin/$plugin" "$@" "$REPO_PATH"/$d
+		fi
+	fi
+done

go.mod

@@ -0,0 +1,14 @@
+module github.com/containers/dnsname
+
+go 1.12
+
+require (
+	github.com/containernetworking/cni v0.7.1
+	github.com/containernetworking/plugins v0.8.2
+	github.com/coreos/go-iptables v0.4.2
+	github.com/onsi/ginkgo v1.10.1
+	github.com/onsi/gomega v1.7.0
+	github.com/sirupsen/logrus v1.4.2
+	github.com/vishvananda/netlink v1.0.0
+	golang.org/x/sys v0.0.0-20190916202348-b4ddaad3f8a3
+)

go.sum

@@ -0,0 +1,80 @@
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plugins/meta/dnsname/conf.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"errors"
+
+	"github.com/containernetworking/cni/pkg/types"
+)
+
+const (
+	//	dnsNameConfPath is where we store the conf, pid, and hosts files
+	dnsNameConfPath = "/run/containers/cni/dnsname"
+	// confFileName is the name of the dns masq conf file
+	confFileName = "dnsmasq.conf"
+	// hostsFileName is the name of the addnhosts file
+	hostsFileName = "addnhosts"
+	// pidFileName is the file where the dnsmasq file is stored
+	pidFileName = "pidfile"
+)
+
+const dnsMasqTemplate = `## WARNING: THIS IS AN AUTOGENERATED FILE
+## AND SHOULD NOT BE EDITED MANUALLY AS IT
+## LIKELY TO AUTOMATICALLY BE REPLACED.
+strict-order
+local=/{{.Domain}}/
+domain={{.Domain}}
+expand-hosts
+pid-file={{.PidFile}}
+except-interface=lo
+bind-dynamic
+no-hosts
+interface={{.NetworkInterface}}
+addn-hosts={{.AddOnHostsFile}}`
+
+var (
+	// ErrBinaryNotFound means that the dnsmasq binary was not found
+	ErrBinaryNotFound = errors.New("unable to locate dnsmasq in path")
+	// ErrNoIPAddressFound means that CNI was unable to resolve an IP address in the CNI configuration
+	ErrNoIPAddressFound = errors.New("no ip address was found in the network")
+)
+
+// DNSNameConf represents the cni config with the domain name attribute
+type DNSNameConf struct {
+	types.NetConf
+	DomainName string `json:"domainName"`
+}
+
+// dnsNameFile describes the plugin's attributes
+type dnsNameFile struct {
+	AddOnHostsFile   string
+	Binary           string
+	ConfigFile       string
+	Domain           string
+	NetworkInterface string
+	PidFile          string
+}

plugins/meta/dnsname/dnsname_suite_test.go

@@ -0,0 +1,27 @@
+// 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 (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"testing"
+)
+
+func TestTuning(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "plugins/meta/dnsname")
+}