Merge pull request #3 from devplayer0/golang

Go rewrite
This commit is contained in:
Jack O'Sullivan 2021-06-10 20:27:07 +01:00 committed by GitHub
commit c80d3eee04
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31 changed files with 3071 additions and 666 deletions

40
.github/workflows/build.yaml vendored Normal file
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@ -0,0 +1,40 @@
name: Build
on:
push:
branches:
- golang
jobs:
docker:
runs-on: ubuntu-20.04
env:
PLATFORMS: linux/amd64,linux/386,linux/arm64,linux/arm/v7
steps:
- uses: actions/checkout@v2
- name: Set up QEMU
uses: docker/setup-qemu-action@v1
- name: Set up Docker Buildx
uses: docker/setup-buildx-action@v1
- name: Install script dependencies
run: pip3 install -r scripts/requirements.txt
- id: vars
name: Generate build vars
run: |
SHA="${{ github.sha }}"
echo "::set-output name=tag::"${SHA:0:8}-$(date +%s)Z""
- name: Build
run: make PLUGIN_TAG=${{ steps.vars.outputs.tag }} multiarch
- name: Push
env:
REGISTRY_USERNAME: ${{ github.actor }}
REGISTRY_PASSWORD: ${{ secrets.GITHUB_TOKEN }}
run: make PLUGIN_TAG=${{ steps.vars.outputs.tag }} push-multiarch

4
.gitignore vendored
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@ -1,4 +1,6 @@
/bin/*
!/bin/.gitkeep
/plugin/
__pycache__/
/multiarch/
.vscode/

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@ -1,12 +1,19 @@
FROM python:3-alpine
FROM golang:1.16-alpine3.13 AS builder
COPY requirements.txt /opt/
RUN apk --no-cache add gcc musl-dev && \
pip install -r /opt/requirements.txt && \
apk --no-cache del gcc musl-dev
WORKDIR /usr/local/src/docker-net-dhcp
COPY go.* ./
RUN go mod download
RUN mkdir -p /opt/plugin /run/docker/plugins /var/run/docker/netns
COPY net-dhcp/ /opt/plugin/net_dhcp
COPY cmd/ ./cmd/
COPY pkg/ ./pkg/
RUN mkdir bin/ && go build -o bin/ ./cmd/...
WORKDIR /opt/plugin
ENTRYPOINT ["python", "-m", "net_dhcp"]
FROM alpine:3.13
RUN mkdir -p /run/docker/plugins
COPY --from=builder /usr/local/src/docker-net-dhcp/bin/net-dhcp /usr/sbin/
COPY --from=builder /usr/local/src/docker-net-dhcp/bin/udhcpc-handler /usr/lib/net-dhcp/udhcpc-handler
ENTRYPOINT ["/usr/sbin/net-dhcp"]

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@ -1,40 +1,55 @@
PLUGIN_NAME = devplayer0/net-dhcp
PLUGIN_TAG ?= latest
PLUGIN_NAME = ghcr.io/devplayer0/docker-net-dhcp
PLUGIN_TAG ?= golang
PLATFORMS ?= linux/amd64,linux/arm64
all: clean build rootfs create enable
SOURCES = $(shell find pkg/ cmd/ -name '*.go')
BINARY = bin/net-dhcp
.PHONY: all debug build create enable disable pdebug push clean
all: create enable
bin/%: $(SOURCES)
go build -o $@ ./cmd/$(shell basename $@)
debug: $(BINARY)
sudo $< -log debug
build: $(SOURCES)
docker build -t $(PLUGIN_NAME):rootfs .
plugin/rootfs: build
mkdir -p plugin/rootfs
docker create --name tmp $(PLUGIN_NAME):rootfs
docker export tmp | tar xC plugin/rootfs
docker rm -vf tmp
plugin: plugin/rootfs config.json
cp config.json $@/
create: plugin
docker plugin rm -f $(PLUGIN_NAME):$(PLUGIN_TAG) || true
docker plugin create $(PLUGIN_NAME):$(PLUGIN_TAG) $<
docker plugin set $(PLUGIN_NAME):$(PLUGIN_TAG) LOG_LEVEL=trace
enable: plugin
docker plugin enable $(PLUGIN_NAME):$(PLUGIN_TAG)
disable:
docker plugin disable $(PLUGIN_NAME):$(PLUGIN_TAG)
pdebug: create enable
sudo sh -c 'tail -f /var/lib/docker/plugins/*/rootfs/var/log/net-dhcp.log'
push: create
docker plugin push $(PLUGIN_NAME):$(PLUGIN_TAG)
multiarch: $(SOURCES)
docker buildx build --platform=$(PLATFORMS) -o type=local,dest=$@ .
push-multiarch: multiarch config.json
scripts/push_multiarch_plugin.py -p $(PLATFORMS) config.json multiarch $(PLUGIN_NAME):$(PLUGIN_TAG)
clean:
@echo "### rm ./plugin"
@rm -rf ./plugin
build:
@echo "### docker build: rootfs image with net-dhcp"
@docker build -t ${PLUGIN_NAME}:rootfs .
rootfs:
@echo "### create rootfs directory in ./plugin/rootfs"
@mkdir -p ./plugin/rootfs
@docker create --name tmp ${PLUGIN_NAME}:rootfs
@docker export tmp | tar -x -C ./plugin/rootfs
@echo "### copy config.json to ./plugin/"
@cp config.json ./plugin/
@docker rm -vf tmp
create:
@echo "### remove existing plugin ${PLUGIN_NAME}:${PLUGIN_TAG} if exists"
@docker plugin rm -f ${PLUGIN_NAME}:${PLUGIN_TAG} || true
@echo "### create new plugin ${PLUGIN_NAME}:${PLUGIN_TAG} from ./plugin"
@docker plugin create ${PLUGIN_NAME}:${PLUGIN_TAG} ./plugin
debug:
@docker run --rm -ti --cap-add CAP_SYS_ADMIN --network host --volume /run/docker/plugins:/run/docker/plugins \
--volume /run/docker.sock:/run/docker.sock --volume /var/run/docker/netns:/var/run/docker/netns \
${PLUGIN_NAME}:rootfs
enable:
@echo "### enable plugin ${PLUGIN_NAME}:${PLUGIN_TAG}"
@docker plugin enable ${PLUGIN_NAME}:${PLUGIN_TAG}
push:
@echo "### push plugin ${PLUGIN_NAME}:${PLUGIN_TAG}"
@docker plugin push ${PLUGIN_NAME}:${PLUGIN_TAG}
-rm -rf multiarch/
-rm -rf plugin/
-rm bin/*

0
bin/.gitkeep Normal file
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65
cmd/net-dhcp/main.go Normal file
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package main
import (
"flag"
"os"
"os/signal"
log "github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
"github.com/devplayer0/docker-net-dhcp/pkg/plugin"
)
var (
logLevel = flag.String("log", "", "log level")
logFile = flag.String("logfile", "", "log file")
bindSock = flag.String("sock", "/run/docker/plugins/net-dhcp.sock", "bind unix socket")
)
func main() {
flag.Parse()
if *logLevel == "" {
if *logLevel = os.Getenv("LOG_LEVEL"); *logLevel == "" {
*logLevel = "info"
}
}
level, err := log.ParseLevel(*logLevel)
if err != nil {
log.WithError(err).Fatal("Failed to parse log level")
}
log.SetLevel(level)
if *logFile != "" {
f, err := os.OpenFile(*logFile, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
if err != nil {
log.WithError(err).Fatal("Failed to open log file for writing")
}
defer f.Close()
log.StandardLogger().Out = f
}
p, err := plugin.NewPlugin()
if err != nil {
log.WithError(err).Fatal("Failed to create plugin")
}
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, unix.SIGINT, unix.SIGTERM)
go func() {
log.Info("Starting server...")
if err := p.Listen(*bindSock); err != nil {
log.WithError(err).Fatal("Failed to start plugin")
}
}()
<-sigs
log.Info("Shutting down...")
if err := p.Close(); err != nil {
log.WithError(err).Fatal("Failed to stop plugin")
}
}

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package main
import (
"encoding/json"
"net"
"os"
log "github.com/sirupsen/logrus"
"github.com/devplayer0/docker-net-dhcp/pkg/udhcpc"
)
func main() {
if len(os.Args) != 2 {
log.Fatalf("Usage: %v <event type>", os.Args[0])
return
}
event := udhcpc.Event{
Type: os.Args[1],
}
switch event.Type {
case "bound", "renew":
if v6, ok := os.LookupEnv("ipv6"); ok {
// Clean up the IP (udhcpc6 emits a _lot_ of zeros)
_, netV6, err := net.ParseCIDR(v6 + "/128")
if err != nil {
log.WithError(err).Warn("Failed to parse IPv6 address")
}
event.Data.IP = netV6.String()
} else {
event.Data.IP = os.Getenv("ip") + "/" + os.Getenv("mask")
event.Data.Gateway = os.Getenv("router")
event.Data.Domain = os.Getenv("domain")
}
case "deconfig", "leasefail", "nak":
default:
log.Warnf("Ignoring unknown event type `%v`", event.Type)
return
}
if err := json.NewEncoder(os.Stdout).Encode(event); err != nil {
log.Fatalf("Failed to encode udhcpc event: %w", err)
return
}
}

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@ -6,8 +6,18 @@
"docker.networkdriver/1.0"
]
},
"entrypoint": [ "python", "-m", "net_dhcp" ],
"workdir": "/opt/plugin",
"entrypoint": ["/usr/sbin/net-dhcp", "-logfile", "/var/log/net-dhcp.log"],
"env": [
{
"description": "Log level",
"name": "LOG_LEVEL",
"value": "info",
"settable": [
"value"
]
}
],
"workdir": "/",
"network": {
"type": "host"
},
@ -19,15 +29,20 @@
"options": [
"bind"
]
},
{
"source": "/var/run/docker",
"destination": "/run/docker",
"type": "bind",
"options": [
"bind"
]
}
],
"pidhost": true,
"linux": {
"capabilities": [
"CAP_NET_ADMIN",
"CAP_SYS_ADMIN",
"CAP_SYS_PTRACE",
"CAP_SYS_RESOURCE"
"CAP_SYS_ADMIN"
]
}
}

23
go.mod Normal file
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module github.com/devplayer0/docker-net-dhcp
go 1.16
require (
github.com/Microsoft/go-winio v0.5.0 // indirect
github.com/containerd/containerd v1.5.2 // indirect
github.com/docker/docker v20.10.7+incompatible
github.com/docker/go-connections v0.4.0 // indirect
github.com/gorilla/handlers v1.5.1
github.com/gorilla/mux v1.8.0 // indirect
github.com/mitchellh/mapstructure v1.4.1
github.com/moby/term v0.0.0-20201216013528-df9cb8a40635 // indirect
github.com/morikuni/aec v1.0.0 // indirect
github.com/sirupsen/logrus v1.8.1
github.com/stretchr/testify v1.7.0 // indirect
github.com/vishvananda/netlink v1.1.1-0.20201029203352-d40f9887b852
github.com/vishvananda/netns v0.0.0-20210104183010-2eb08e3e575f
golang.org/x/net v0.0.0-20210525063256-abc453219eb5 // indirect
golang.org/x/sys v0.0.0-20210603125802-9665404d3644
golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba // indirect
google.golang.org/grpc v1.38.0 // indirect
)

976
go.sum Normal file
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@ -0,0 +1,976 @@
bazil.org/fuse v0.0.0-20160811212531-371fbbdaa898/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8=
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
github.com/Azure/azure-sdk-for-go v16.2.1+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8=
github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
github.com/Azure/go-autorest v10.8.1+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
github.com/Azure/go-autorest v14.2.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
github.com/Azure/go-autorest/autorest v0.11.1/go.mod h1:JFgpikqFJ/MleTTxwepExTKnFUKKszPS8UavbQYUMuw=
github.com/Azure/go-autorest/autorest/adal v0.9.0/go.mod h1:/c022QCutn2P7uY+/oQWWNcK9YU+MH96NgK+jErpbcg=
github.com/Azure/go-autorest/autorest/adal v0.9.5/go.mod h1:B7KF7jKIeC9Mct5spmyCB/A8CG/sEz1vwIRGv/bbw7A=
github.com/Azure/go-autorest/autorest/date v0.3.0/go.mod h1:BI0uouVdmngYNUzGWeSYnokU+TrmwEsOqdt8Y6sso74=
github.com/Azure/go-autorest/autorest/mocks v0.4.0/go.mod h1:LTp+uSrOhSkaKrUy935gNZuuIPPVsHlr9DSOxSayd+k=
github.com/Azure/go-autorest/autorest/mocks v0.4.1/go.mod h1:LTp+uSrOhSkaKrUy935gNZuuIPPVsHlr9DSOxSayd+k=
github.com/Azure/go-autorest/logger v0.2.0/go.mod h1:T9E3cAhj2VqvPOtCYAvby9aBXkZmbF5NWuPV8+WeEW8=
github.com/Azure/go-autorest/tracing v0.6.0/go.mod h1:+vhtPC754Xsa23ID7GlGsrdKBpUA79WCAKPPZVC2DeU=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
github.com/Microsoft/go-winio v0.4.11/go.mod h1:VhR8bwka0BXejwEJY73c50VrPtXAaKcyvVC4A4RozmA=
github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jBhyzoq1bpyYA=
github.com/Microsoft/go-winio v0.4.15-0.20190919025122-fc70bd9a86b5/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw=
github.com/Microsoft/go-winio v0.4.16-0.20201130162521-d1ffc52c7331/go.mod h1:XB6nPKklQyQ7GC9LdcBEcBl8PF76WugXOPRXwdLnMv0=
github.com/Microsoft/go-winio v0.4.16/go.mod h1:XB6nPKklQyQ7GC9LdcBEcBl8PF76WugXOPRXwdLnMv0=
github.com/Microsoft/go-winio v0.4.17-0.20210211115548-6eac466e5fa3/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84=
github.com/Microsoft/go-winio v0.4.17-0.20210324224401-5516f17a5958/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84=
github.com/Microsoft/go-winio v0.4.17/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84=
github.com/Microsoft/go-winio v0.5.0 h1:Elr9Wn+sGKPlkaBvwu4mTrxtmOp3F3yV9qhaHbXGjwU=
github.com/Microsoft/go-winio v0.5.0/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84=
github.com/Microsoft/hcsshim v0.8.6/go.mod h1:Op3hHsoHPAvb6lceZHDtd9OkTew38wNoXnJs8iY7rUg=
github.com/Microsoft/hcsshim v0.8.7-0.20190325164909-8abdbb8205e4/go.mod h1:Op3hHsoHPAvb6lceZHDtd9OkTew38wNoXnJs8iY7rUg=
github.com/Microsoft/hcsshim v0.8.7/go.mod h1:OHd7sQqRFrYd3RmSgbgji+ctCwkbq2wbEYNSzOYtcBQ=
github.com/Microsoft/hcsshim v0.8.9/go.mod h1:5692vkUqntj1idxauYlpoINNKeqCiG6Sg38RRsjT5y8=
github.com/Microsoft/hcsshim v0.8.14/go.mod h1:NtVKoYxQuTLx6gEq0L96c9Ju4JbRJ4nY2ow3VK6a9Lg=
github.com/Microsoft/hcsshim v0.8.15/go.mod h1:x38A4YbHbdxJtc0sF6oIz+RG0npwSCAvn69iY6URG00=
github.com/Microsoft/hcsshim v0.8.16 h1:8/auA4LFIZFTGrqfKhGBSXwM6/4X1fHa/xniyEHu8ac=
github.com/Microsoft/hcsshim v0.8.16/go.mod h1:o5/SZqmR7x9JNKsW3pu+nqHm0MF8vbA+VxGOoXdC600=
github.com/Microsoft/hcsshim/test v0.0.0-20201218223536-d3e5debf77da/go.mod h1:5hlzMzRKMLyo42nCZ9oml8AdTlq/0cvIaBv6tK1RehU=
github.com/Microsoft/hcsshim/test v0.0.0-20210227013316-43a75bb4edd3/go.mod h1:mw7qgWloBUl75W/gVH3cQszUg1+gUITj7D6NY7ywVnY=
github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
github.com/Shopify/logrus-bugsnag v0.0.0-20171204204709-577dee27f20d/go.mod h1:HI8ITrYtUY+O+ZhtlqUnD8+KwNPOyugEhfP9fdUIaEQ=
github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alexflint/go-filemutex v0.0.0-20171022225611-72bdc8eae2ae/go.mod h1:CgnQgUtFrFz9mxFNtED3jI5tLDjKlOM+oUF/sTk6ps0=
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github.com/docker/go-units v0.4.0 h1:3uh0PgVws3nIA0Q+MwDC8yjEPf9zjRfZZWXZYDct3Tw=
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github.com/docker/spdystream v0.0.0-20160310174837-449fdfce4d96/go.mod h1:Qh8CwZgvJUkLughtfhJv5dyTYa91l1fOUCrgjqmcifM=
github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE=
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github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
github.com/felixge/httpsnoop v1.0.1 h1:lvB5Jl89CsZtGIWuTcDM1E/vkVs49/Ml7JJe07l8SPQ=
github.com/felixge/httpsnoop v1.0.1/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
github.com/form3tech-oss/jwt-go v3.2.2+incompatible/go.mod h1:pbq4aXjuKjdthFRnoDwaVPLA+WlJuPGy+QneDUgJi2k=
github.com/frankban/quicktest v1.11.3/go.mod h1:wRf/ReqHper53s+kmmSZizM8NamnL3IM0I9ntUbOk+k=
github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
github.com/fullsailor/pkcs7 v0.0.0-20190404230743-d7302db945fa/go.mod h1:KnogPXtdwXqoenmZCw6S+25EAm2MkxbG0deNDu4cbSA=
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github.com/go-ini/ini v1.25.4/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
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github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
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github.com/gogo/googleapis v1.4.0/go.mod h1:5YRNX2z1oM5gXdAkurHa942MDgEJyk02w4OecKY87+c=
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github.com/tchap/go-patricia v2.2.6+incompatible/go.mod h1:bmLyhP68RS6kStMGxByiQ23RP/odRBOTVjwp2cDyi6I=
github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
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github.com/ugorji/go v1.1.4/go.mod h1:uQMGLiO92mf5W77hV/PUCpI3pbzQx3CRekS0kk+RGrc=
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github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
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github.com/willf/bitset v1.1.11-0.20200630133818-d5bec3311243/go.mod h1:RjeCKbqT1RxIR/KWY6phxZiaY1IyutSBfGjNPySAYV4=
github.com/willf/bitset v1.1.11 h1:N7Z7E9UvjW+sGsEl7k/SJrvY2reP1A07MrGuCjIOjRE=
github.com/willf/bitset v1.1.11/go.mod h1:83CECat5yLh5zVOf4P1ErAgKA5UDvKtgyUABdr3+MjI=
github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415/go.mod h1:GwrjFmJcFw6At/Gs6z4yjiIwzuJ1/+UwLxMQDVQXShQ=
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github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
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github.com/yvasiyarov/newrelic_platform_go v0.0.0-20140908184405-b21fdbd4370f/go.mod h1:GlGEuHIJweS1mbCqG+7vt2nvWLzLLnRHbXz5JKd/Qbg=
go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
go.etcd.io/bbolt v1.3.3/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
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go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
go.opencensus.io v0.22.3 h1:8sGtKOrtQqkN1bp2AtX+misvLIlOmsEsNd+9NIcPEm8=
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go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
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golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20190611184440-5c40567a22f8/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20200728195943-123391ffb6de/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
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golang.org/x/exp v0.0.0-20191030013958-a1ab85dbe136/go.mod h1:JXzH8nQsPlswgeRAPE3MuO9GYsAcnJvJ4vnMwN/5qkY=
golang.org/x/exp v0.0.0-20191129062945-2f5052295587/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
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golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM=
golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU=
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golang.org/x/lint v0.0.0-20190409202823-959b441ac422/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/lint v0.0.0-20190909230951-414d861bb4ac/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f/go.mod h1:5qLYkcX4OjUUV8bRuDixDT3tpyyb+LUpUlRWLxfhWrs=
golang.org/x/lint v0.0.0-20200130185559-910be7a94367/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
golang.org/x/lint v0.0.0-20200302205851-738671d3881b/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20181011144130-49bb7cea24b1/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190522155817-f3200d17e092/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190619014844-b5b0513f8c1b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20191004110552-13f9640d40b9/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200222125558-5a598a2470a0/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200301022130-244492dfa37a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
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gotest.tools/v3 v3.0.3 h1:4AuOwCGf4lLR9u3YOe2awrHygurzhO/HeQ6laiA6Sx0=
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honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
k8s.io/api v0.20.1/go.mod h1:KqwcCVogGxQY3nBlRpwt+wpAMF/KjaCc7RpywacvqUo=
k8s.io/api v0.20.4/go.mod h1:++lNL1AJMkDymriNniQsWRkMDzRaX2Y/POTUi8yvqYQ=
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k8s.io/apiserver v0.20.1/go.mod h1:ro5QHeQkgMS7ZGpvf4tSMx6bBOgPfE+f52KwvXfScaU=
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@ -1,23 +0,0 @@
import logging
from flask import Flask, jsonify
class NetDhcpError(Exception):
def __init__(self, status, *args):
Exception.__init__(self, *args)
self.status = status
app = Flask(__name__)
from . import network
logger = logging.getLogger('gunicorn.error')
@app.errorhandler(404)
def err_not_found(_e):
return jsonify({'Err': 'API not found'}), 404
@app.errorhandler(Exception)
def err(e):
logger.exception(e)
return jsonify({'Err': str(e)}), 500

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@ -1,14 +0,0 @@
import logging
import socketserver
from werkzeug.serving import run_simple
from . import app
fh = logging.FileHandler('/var/log/net-dhcp.log')
fh.setFormatter(logging.Formatter('%(asctime)s [%(levelname)s] %(message)s'))
logger = logging.getLogger('net-dhcp')
logger.setLevel(logging.DEBUG)
logger.addHandler(fh)
socketserver.TCPServer.allow_reuse_address = True
run_simple('unix:///run/docker/plugins/net-dhcp.sock', 0, app)

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@ -1,394 +0,0 @@
import itertools
import ipaddress
import logging
import atexit
import socket
import time
import threading
import subprocess
import pyroute2
from pyroute2.netlink.rtnl import rtypes
import docker
from flask import request, jsonify
from . import NetDhcpError, udhcpc, app
OPTS_KEY = 'com.docker.network.generic'
OPT_BRIDGE = 'bridge'
OPT_IPV6 = 'ipv6'
logger = logging.getLogger('net-dhcp')
ndb = pyroute2.NDB()
@atexit.register
def close_ndb():
ndb.close()
client = docker.from_env()
@atexit.register
def close_docker():
client.close()
gateway_hints = {}
container_dhcp_clients = {}
@atexit.register
def cleanup_dhcp():
for endpoint, dhcp in container_dhcp_clients.items():
logger.warning('cleaning up orphaned container DHCP client (endpoint "%s")', endpoint)
dhcp.stop()
def veth_pair(e):
return f'dh-{e[:12]}', f'{e[:12]}-dh'
def iface_addrs(iface):
return list(map(lambda a: ipaddress.ip_interface((a['address'], a['prefixlen'])), iface.ipaddr))
def iface_nets(iface):
return list(map(lambda n: n.network, iface_addrs(iface)))
def get_bridges():
reserved_nets = set(map(ipaddress.ip_network, map(lambda c: c['Subnet'], \
itertools.chain.from_iterable(map(lambda i: i['Config'], filter(lambda i: i['Driver'] != 'net-dhcp', \
map(lambda n: n.attrs['IPAM'], client.networks.list())))))))
return dict(map(lambda i: (i['ifname'], i), filter(lambda i: i['kind'] == 'bridge' and not \
set(iface_nets(i)).intersection(reserved_nets), map(lambda i: ndb.interfaces[i.ifname], ndb.interfaces))))
def net_bridge(n):
return ndb.interfaces[client.networks.get(n).attrs['Options'][OPT_BRIDGE]]
def ipv6_enabled(n):
options = client.networks.get(n).attrs['Options']
return OPT_IPV6 in options and options[OPT_IPV6] == 'true'
def endpoint_container_iface(n, e):
for cid, info in client.networks.get(n).attrs['Containers'].items():
if info['EndpointID'] == e:
container = client.containers.get(cid)
netns = f'/proc/{container.attrs["State"]["Pid"]}/ns/net'
with pyroute2.NetNS(netns) as rtnl:
for link in rtnl.get_links():
attrs = dict(link['attrs'])
if attrs['IFLA_ADDRESS'] == info['MacAddress']:
return {
'netns': netns,
'ifname': attrs['IFLA_IFNAME'],
'address': attrs['IFLA_ADDRESS']
}
break
return None
def await_endpoint_container_iface(n, e, timeout=5):
start = time.time()
iface = None
while time.time() - start < timeout:
try:
iface = endpoint_container_iface(n, e)
except docker.errors.NotFound:
time.sleep(0.5)
if not iface:
raise NetDhcpError('Timed out waiting for container to become availabile')
return iface
def endpoint_container_hostname(n, e):
for cid, info in client.networks.get(n).attrs['Containers'].items():
if info['EndpointID'] == e:
return client.containers.get(cid).attrs['Config']['Hostname']
return None
@app.route('/NetworkDriver.GetCapabilities', methods=['POST'])
def net_get_capabilities():
return jsonify({
'Scope': 'local',
'ConnectivityScope': 'global'
})
@app.route('/NetworkDriver.CreateNetwork', methods=['POST'])
def create_net():
req = request.get_json(force=True)
for data in req['IPv4Data']:
if data['AddressSpace'] != 'null' or data['Pool'] != '0.0.0.0/0':
return jsonify({'Err': 'Only the null IPAM driver is supported'}), 400
options = req['Options'][OPTS_KEY]
if OPT_BRIDGE not in options:
return jsonify({'Err': 'No bridge provided'}), 400
# We have to use a custom "enable IPv6" option because Docker's null IPAM driver doesn't support IPv6 and a plugin
# IPAM driver isn't allowed to return an empty address
if OPT_IPV6 in options and options[OPT_IPV6] not in ('', 'true', 'false'):
return jsonify({'Err': 'Invalid boolean value for ipv6'}), 400
desired = options[OPT_BRIDGE]
bridges = get_bridges()
if desired not in bridges:
return jsonify({'Err': f'Bridge "{desired}" not found (or the specified bridge is already used by Docker)'}), 400
logger.info('Creating network "%s" (using bridge "%s")', req['NetworkID'], desired)
return jsonify({})
@app.route('/NetworkDriver.DeleteNetwork', methods=['POST'])
def delete_net():
return jsonify({})
@app.route('/NetworkDriver.CreateEndpoint', methods=['POST'])
def create_endpoint():
req = request.get_json(force=True)
network_id = req['NetworkID']
endpoint_id = req['EndpointID']
req_iface = req['Interface']
bridge = net_bridge(network_id)
bridge_addrs = iface_addrs(bridge)
if_host, if_container = veth_pair(endpoint_id)
logger.info('creating veth pair %s <=> %s', if_host, if_container)
if_host = (ndb.interfaces.create(ifname=if_host, kind='veth', peer=if_container)
.set('state', 'up')
.commit())
try:
start = time.time()
while isinstance(if_container, str) and time.time() - start < 10:
try:
if_container = (ndb.interfaces[if_container]
.set('state', 'up')
.commit())
except KeyError:
time.sleep(0.5)
if isinstance(if_container, str):
raise NetDhcpError(f'timed out waiting for {if_container} to appear in host')
(bridge
.add_port(if_host)
.commit())
res_iface = {
'MacAddress': '',
'Address': '',
'AddressIPv6': ''
}
if 'MacAddress' in req_iface and req_iface['MacAddress']:
(if_container
.set('address', req_iface['MacAddress'])
.commit())
else:
res_iface['MacAddress'] = if_container['address']
def try_addr(type_):
addr = None
k = 'AddressIPv6' if type_ == 'v6' else 'Address'
if k in req_iface and req_iface[k]:
# TODO: Should we allow static IP's somehow?
# Just validate the address, Docker will add it to the interface for us
#addr = ipaddress.ip_interface(req_iface[k])
#for bridge_addr in bridge_addrs:
# if addr.ip == bridge_addr.ip:
# raise NetDhcpError(400, f'Address {addr} is already in use on bridge {bridge["ifname"]}')
raise NetDhcpError('Only the null IPAM driver is supported')
else:
dhcp = udhcpc.DHCPClient(if_container, v6=type_ == 'v6', once=True)
addr = dhcp.finish()
if not addr:
return
res_iface[k] = str(addr)
if dhcp.gateway:
gateway_hints[endpoint_id] = dhcp.gateway
logger.info('Adding IP%s address %s to %s', type_, addr, if_container['ifname'])
try_addr('v4')
if ipv6_enabled(network_id):
try_addr('v6')
res = jsonify({
'Interface': res_iface
})
except Exception as e:
logger.exception(e)
if not isinstance(if_container, str):
(bridge
.del_port(if_host)
.commit())
(if_host
.remove()
.commit())
if isinstance(e, NetDhcpError):
res = jsonify({'Err': str(e)}), e.status
else:
res = jsonify({'Err': str(e)}), 500
finally:
return res
@app.route('/NetworkDriver.EndpointOperInfo', methods=['POST'])
def endpoint_info():
req = request.get_json(force=True)
bridge = net_bridge(req['NetworkID'])
if_host, _if_container = veth_pair(req['EndpointID'])
if_host = ndb.interfaces[if_host]
return jsonify({
'bridge': bridge['ifname'],
'if_host': {
'name': if_host['ifname'],
'mac': if_host['address']
}
})
@app.route('/NetworkDriver.DeleteEndpoint', methods=['POST'])
def delete_endpoint():
req = request.get_json(force=True)
bridge = net_bridge(req['NetworkID'])
if_host, _if_container = veth_pair(req['EndpointID'])
if_host = ndb.interfaces[if_host]
bridge.del_port(if_host['ifname'])
(if_host
.remove()
.commit())
return jsonify({})
@app.route('/NetworkDriver.Join', methods=['POST'])
def join():
req = request.get_json(force=True)
network = req['NetworkID']
endpoint = req['EndpointID']
bridge = net_bridge(req['NetworkID'])
_if_host, if_container = veth_pair(req['EndpointID'])
res = {
'InterfaceName': {
'SrcName': if_container,
'DstPrefix': bridge['ifname']
},
'StaticRoutes': []
}
if endpoint in gateway_hints:
gateway = gateway_hints[endpoint]
logger.info('Setting IPv4 gateway from DHCP (%s)', gateway)
res['Gateway'] = str(gateway)
del gateway_hints[endpoint]
ipv6 = ipv6_enabled(network)
for route in bridge.routes:
if route['type'] != rtypes['RTN_UNICAST'] or \
(route['family'] == socket.AF_INET6 and not ipv6):
continue
if route['dst'] in ('', '/0'):
if route['family'] == socket.AF_INET and 'Gateway' not in res:
logger.info('Adding IPv4 gateway %s', route['gateway'])
res['Gateway'] = route['gateway']
elif route['family'] == socket.AF_INET6 and 'GatewayIPv6' not in res:
logger.info('Adding IPv6 gateway %s', route['gateway'])
res['GatewayIPv6'] = route['gateway']
elif route['gateway']:
dst = f'{route["dst"]}/{route["dst_len"]}'
logger.info('Adding route to %s via %s', dst, route['gateway'])
res['StaticRoutes'].append({
'Destination': dst,
'RouteType': 0,
'NextHop': route['gateway']
})
container_dhcp_clients[endpoint] = ContainerDHCPManager(network, endpoint)
return jsonify(res)
@app.route('/NetworkDriver.Leave', methods=['POST'])
def leave():
req = request.get_json(force=True)
endpoint = req['EndpointID']
if endpoint in container_dhcp_clients:
container_dhcp_clients[endpoint].stop()
del container_dhcp_clients[endpoint]
return jsonify({})
# Trying to grab the container's attributes (to get the network namespace)
# will deadlock (since Docker is waiting on us), so we must defer starting
# the DHCP client
class ContainerDHCPManager:
def __init__(self, network, endpoint):
self.network = network
self.endpoint = endpoint
self.ipv6 = ipv6_enabled(network)
self.dhcp = None
self.dhcp6 = None
self._thread = threading.Thread(target=self.run)
self._thread.start()
def _on_event(self, dhcp, event_type, _event):
if event_type != udhcpc.EventType.RENEW or not dhcp.gateway:
return
logger.info('[dhcp container] Replacing gateway with %s', dhcp.gateway)
subprocess.check_call(['nsenter', f'-n{dhcp.netns}', '--', '/sbin/ip', 'route', 'replace', 'default', 'via',
str(dhcp.gateway)], timeout=1, stdin=subprocess.DEVNULL, stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL)
# TODO: Adding default route with NDB seems to be broken (because of the dst syntax?)
#for route in ndb.routes:
# if route['type'] != rtypes['RTN_UNICAST'] or \
# route['oif'] != dhcp.iface['index'] or \
# (route['family'] == socket.AF_INET6 and not self.ipv6) or \
# route['dst'] not in ('', '/0'):
# continue
# # Needed because Route.remove() doesn't like a blank destination
# logger.info('Removing default route via %s', route['gateway'])
# route['dst'] = '::' if route['family'] == socket.AF_INET6 else '0.0.0.0'
# (route
# .remove()
# .commit())
#logger.info('Adding default route via %s', dhcp.gateway)
#(ndb.routes.add({'oif': dhcp.iface['index'], 'gateway': dhcp.gateway})
# .commit())
def run(self):
try:
iface = await_endpoint_container_iface(self.network, self.endpoint)
hostname = endpoint_container_hostname(self.network, self.endpoint)
self.dhcp = udhcpc.DHCPClient(iface, event_listener=self._on_event, hostname=hostname)
logger.info('Starting DHCPv4 client on %s in container namespace %s', iface['ifname'], \
self.dhcp.netns)
if self.ipv6:
self.dhcp6 = udhcpc.DHCPClient(iface, v6=True, event_listener=self._on_event, hostname=hostname)
logger.info('Starting DHCPv6 client on %s in container namespace %s', iface['ifname'], \
self.dhcp6.netns)
except Exception as e:
logger.exception(e)
if self.dhcp:
self.dhcp.finish(timeout=1)
def stop(self):
if not self.dhcp:
return
try:
logger.info('Shutting down DHCPv4 client on %s in container namespace %s', \
self.dhcp.iface['ifname'], self.dhcp.netns)
self.dhcp.finish(timeout=1)
finally:
try:
if self.ipv6:
logger.info('Shutting down DHCPv6 client on %s in container namespace %s', \
self.dhcp6.iface['ifname'], self.dhcp.netns)
self.dhcp6.finish(timeout=1)
finally:
self._thread.join()
# we have to do this since the docker client leaks sockets...
global client
client.close()
client = docker.from_env()

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@ -1,148 +0,0 @@
from enum import Enum
import ipaddress
import json
import struct
import binascii
import os
from os import path
from select import select
import threading
import subprocess
import logging
from eventfd import EventFD
import posix_ipc
HANDLER_SCRIPT = path.join(path.dirname(__file__), 'udhcpc_handler.py')
AWAIT_INTERVAL = 0.1
VENDOR_ID = 'docker'
class EventType(Enum):
BOUND = 'bound'
RENEW = 'renew'
DECONFIG = 'deconfig'
LEASEFAIL = 'leasefail'
logger = logging.getLogger('net-dhcp')
class DHCPClientError(Exception):
pass
def _nspopen_wrapper(netns):
return lambda cmd, *args, **kwargs: subprocess.Popen(['nsenter', f'-n{netns}', '--'] + cmd, *args, **kwargs)
class DHCPClient:
def __init__(self, iface, v6=False, once=False, hostname=None, event_listener=None):
self.iface = iface
self.v6 = v6
self.once = once
self.event_listeners = [DHCPClient._attr_listener]
if event_listener:
self.event_listeners.append(event_listener)
self.netns = None
if 'netns' in iface:
self.netns = iface['netns']
logger.debug('udhcpc using netns %s', self.netns)
Popen = _nspopen_wrapper(self.netns) if self.netns else subprocess.Popen
bin_path = '/usr/bin/udhcpc6' if v6 else '/sbin/udhcpc'
cmdline = [bin_path, '-s', HANDLER_SCRIPT, '-i', iface['ifname'], '-f']
cmdline.append('-q' if once else '-R')
if hostname:
cmdline.append('-x')
if v6:
# TODO: We encode the fqdn for DHCPv6 because udhcpc6 seems to be broken
# flags: S bit set (see RFC4704)
enc_hostname = hostname.encode('utf-8')
enc_hostname = struct.pack('BB', 0b0001, len(enc_hostname)) + enc_hostname
enc_hostname = binascii.hexlify(enc_hostname).decode('ascii')
hostname_opt = f'0x27:{enc_hostname}'
else:
hostname_opt = f'hostname:{hostname}'
cmdline.append(hostname_opt)
if not v6:
cmdline += ['-V', VENDOR_ID]
self._suffix = '6' if v6 else ''
self._event_queue = posix_ipc.MessageQueue(f'/udhcpc{self._suffix}_{iface["address"].replace(":", "_")}', \
flags=os.O_CREAT | os.O_EXCL, max_messages=2, max_message_size=1024)
self.proc = Popen(cmdline, env={'EVENT_QUEUE': self._event_queue.name}, stdin=subprocess.DEVNULL,
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
if hostname:
logger.debug('[udhcpc%s#%d] using hostname "%s"', self._suffix, self.proc.pid, hostname)
self._has_lease = threading.Event()
self.ip = None
self.gateway = None
self.domain = None
self._shutdown_event = EventFD()
self.shutdown = False
self._event_thread = threading.Thread(target=self._read_events)
self._event_thread.start()
def _attr_listener(self, event_type, event):
if event_type in (EventType.BOUND, EventType.RENEW):
self.ip = ipaddress.ip_interface(event['ip'])
if 'gateway' in event:
self.gateway = ipaddress.ip_address(event['gateway'])
else:
self.gateway = None
self.domain = event.get('domain')
self._has_lease.set()
elif event_type == EventType.DECONFIG:
self._has_lease.clear()
self.ip = None
self.gateway = None
self.domain = None
def _read_events(self):
while True:
r, _w, _e = select([self._shutdown_event, self._event_queue.mqd], [], [])
if self._shutdown_event in r:
break
msg, _priority = self._event_queue.receive()
event = json.loads(msg.decode('utf-8'))
try:
event['type'] = EventType(event['type'])
except ValueError:
logger.warning('udhcpc%s#%d unknown event "%s"', self._suffix, self.proc.pid, event)
continue
logger.debug('[udhcp%s#%d event] %s', self._suffix, self.proc.pid, event)
for listener in self.event_listeners:
try:
listener(self, event['type'], event)
except Exception as ex:
logger.exception(ex)
self.shutdown = True
del self._shutdown_event
def await_ip(self, timeout=10):
if not self._has_lease.wait(timeout=timeout):
raise DHCPClientError(f'Timed out waiting for lease from udhcpc{self._suffix}')
return self.ip
def finish(self, timeout=5):
if self.shutdown or self._shutdown_event.is_set():
return
try:
if self.proc.returncode is not None and (not self.once or self.proc.returncode != 0):
raise DHCPClientError(f'udhcpc{self._suffix} exited early with code {self.proc.returncode}')
if self.once:
self.await_ip()
else:
self.proc.terminate()
if self.proc.wait(timeout=timeout) != 0:
raise DHCPClientError(f'udhcpc{self._suffix} exited with non-zero exit code {self.proc.returncode}')
return self.ip
finally:
self._shutdown_event.set()
self._event_thread.join()
self._event_queue.close()
self._event_queue.unlink()

View File

@ -1,29 +0,0 @@
#!/usr/bin/env python
import json
import sys
from os import environ as env
import posix_ipc
if __name__ != '__main__':
print('You shouldn\'t be importing this script!')
sys.exit(1)
event = {'type': sys.argv[1]}
if event['type'] in ('bound', 'renew'):
if 'ipv6' in env:
event['ip'] = env['ipv6']
else:
event['ip'] = f'{env["ip"]}/{env["mask"]}'
if 'router' in env:
event['gateway'] = env['router']
if 'domain' in env:
event['domain'] = env['domain']
elif event['type'] in ('deconfig', 'leasefail', 'nak'):
pass
else:
event['type'] = 'unknown'
queue = posix_ipc.MessageQueue(env['EVENT_QUEUE'])
queue.send(json.dumps(event))
queue.close()

300
pkg/plugin/dhcp_manager.go Normal file
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package plugin
import (
"context"
"fmt"
"net"
"time"
dTypes "github.com/docker/docker/api/types"
docker "github.com/docker/docker/client"
log "github.com/sirupsen/logrus"
"github.com/vishvananda/netlink"
"github.com/vishvananda/netns"
"golang.org/x/sys/unix"
"github.com/devplayer0/docker-net-dhcp/pkg/udhcpc"
"github.com/devplayer0/docker-net-dhcp/pkg/util"
)
const pollTime = 100 * time.Millisecond
type dhcpManager struct {
docker *docker.Client
joinReq JoinRequest
opts DHCPNetworkOptions
LastIP *netlink.Addr
LastIPv6 *netlink.Addr
hostname string
nsHandle netns.NsHandle
netHandle *netlink.Handle
ctrLink netlink.Link
stopChan chan struct{}
errChan chan error
errChanV6 chan error
}
func newDHCPManager(docker *docker.Client, r JoinRequest, opts DHCPNetworkOptions) *dhcpManager {
return &dhcpManager{
docker: docker,
joinReq: r,
opts: opts,
stopChan: make(chan struct{}),
}
}
func (m *dhcpManager) logFields(v6 bool) log.Fields {
return log.Fields{
"network": m.joinReq.NetworkID[:12],
"endpoint": m.joinReq.EndpointID[:12],
"sandbox": m.joinReq.SandboxKey,
"is_ipv6": v6,
}
}
func (m *dhcpManager) renew(v6 bool, info udhcpc.Info) error {
lastIP := m.LastIP
if v6 {
lastIP = m.LastIPv6
}
ip, err := netlink.ParseAddr(info.IP)
if err != nil {
return fmt.Errorf("failed to parse IP address: %w", err)
}
if !ip.Equal(*lastIP) {
// TODO: We can't deal with a different renewed IP for the same reason as described for `bound`
log.
WithFields(m.logFields(v6)).
WithField("old_ip", lastIP).
WithField("new_ip", ip).
Warn("udhcpc renew with changed IP")
}
if !v6 && info.Gateway != "" {
newGateway := net.ParseIP(info.Gateway)
routes, err := m.netHandle.RouteListFiltered(unix.AF_INET, &netlink.Route{
LinkIndex: m.ctrLink.Attrs().Index,
Dst: nil,
}, netlink.RT_FILTER_OIF|netlink.RT_FILTER_DST)
if err != nil {
return fmt.Errorf("failed to list routes: %w", err)
}
if len(routes) == 0 {
log.
WithFields(m.logFields(v6)).
WithField("gateway", newGateway).
Info("udhcpc renew adding default route")
if err := m.netHandle.RouteAdd(&netlink.Route{
LinkIndex: m.ctrLink.Attrs().Index,
Gw: newGateway,
}); err != nil {
return fmt.Errorf("failed to add default route: %w", err)
}
} else if !newGateway.Equal(routes[0].Gw) {
log.
WithFields(m.logFields(v6)).
WithField("old_gateway", routes[0].Gw).
WithField("new_gateway", newGateway).
Info("udhcpc renew replacing default route")
routes[0].Gw = newGateway
if err := m.netHandle.RouteReplace(&routes[0]); err != nil {
return fmt.Errorf("failed to replace default route: %w", err)
}
}
}
return nil
}
func (m *dhcpManager) setupClient(v6 bool) (chan error, error) {
v6Str := ""
if v6 {
v6Str = "v6"
}
client, err := udhcpc.NewDHCPClient(m.ctrLink.Attrs().Name, &udhcpc.DHCPClientOptions{
Hostname: m.hostname,
V6: v6,
Namespace: m.joinReq.SandboxKey,
})
if err != nil {
return nil, fmt.Errorf("failed to create DHCP%v client: %w", v6Str, err)
}
events, err := client.Start()
if err != nil {
return nil, fmt.Errorf("failed to start DHCP%v client: %w", v6Str, err)
}
errChan := make(chan error)
go func() {
for {
select {
case event := <-events:
switch event.Type {
// TODO: We can't really allow the IP in the container to be deleted, it'll delete some of our previously
// copied routes. Should this be handled somehow?
//case "deconfig":
// ip := m.LastIP
// if v6 {
// ip = m.LastIPv6
// }
// log.
// WithFields(m.logFields(v6)).
// WithField("ip", ip).
// Info("udhcpc deconfiguring, deleting previously acquired IP")
// if err := m.netHandle.AddrDel(m.ctrLink, ip); err != nil {
// log.
// WithError(err).
// WithFields(m.logFields(v6)).
// WithField("ip", ip).
// Error("Failed to delete existing udhcpc address")
// }
// We're `bound` from the beginning
//case "bound":
case "renew":
log.
WithFields(m.logFields(v6)).
Debug("udhcpc renew")
if err := m.renew(v6, event.Data); err != nil {
log.
WithError(err).
WithFields(m.logFields(v6)).
WithField("gateway", event.Data.Gateway).
WithField("new_ip", event.Data.IP).
Error("Failed to execute IP renewal")
}
case "leasefail":
log.WithFields(m.logFields(v6)).Warn("udhcpc failed to get a lease")
case "nak":
log.WithFields(m.logFields(v6)).Warn("udhcpc client received NAK")
}
case <-m.stopChan:
log.WithFields(m.logFields(v6)).Info("Shutting down persistent DHCP client")
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
errChan <- client.Finish(ctx)
return
}
}
}()
return errChan, nil
}
func (m *dhcpManager) Start(ctx context.Context) error {
var err error
m.nsHandle, err = util.AwaitNetNS(ctx, m.joinReq.SandboxKey, pollTime)
if err != nil {
return fmt.Errorf("failed to get sandbox network namespace: %w", err)
}
m.netHandle, err = netlink.NewHandleAt(m.nsHandle)
if err != nil {
m.nsHandle.Close()
return fmt.Errorf("failed to open netlink handle in sandbox namespace: %w", err)
}
if err := func() error {
hostName, oldCtrName := vethPairNames(m.joinReq.EndpointID)
hostLink, err := netlink.LinkByName(hostName)
if err != nil {
return fmt.Errorf("failed to find host side of veth pair: %w", err)
}
hostVeth, ok := hostLink.(*netlink.Veth)
if !ok {
return util.ErrNotVEth
}
ctrIndex, err := netlink.VethPeerIndex(hostVeth)
if err != nil {
return fmt.Errorf("failed to get container side of veth's index: %w", err)
}
if err := util.AwaitCondition(ctx, func() (bool, error) {
m.ctrLink, err = util.AwaitLinkByIndex(ctx, m.netHandle, ctrIndex, pollTime)
if err != nil {
return false, fmt.Errorf("failed to get link for container side of veth pair: %w", err)
}
return m.ctrLink.Attrs().Name != oldCtrName, nil
}, pollTime); err != nil {
return err
}
dockerNet, err := m.docker.NetworkInspect(ctx, m.joinReq.NetworkID, dTypes.NetworkInspectOptions{})
if err != nil {
return fmt.Errorf("failed to get Docker network info: %w", err)
}
var ctrID string
for id, info := range dockerNet.Containers {
if info.EndpointID == m.joinReq.EndpointID {
ctrID = id
break
}
}
if ctrID == "" {
return util.ErrNoContainer
}
ctr, err := m.docker.ContainerInspect(ctx, ctrID)
if err != nil {
return fmt.Errorf("failed to get Docker container info: %w", err)
}
m.hostname = ctr.Config.Hostname
if m.errChan, err = m.setupClient(false); err != nil {
close(m.stopChan)
return err
}
if m.opts.IPv6 {
if m.errChanV6, err = m.setupClient(true); err != nil {
close(m.stopChan)
return err
}
}
return nil
}(); err != nil {
m.netHandle.Delete()
m.nsHandle.Close()
return err
}
return nil
}
func (m *dhcpManager) Stop() error {
defer m.nsHandle.Close()
defer m.netHandle.Delete()
close(m.stopChan)
if err := <-m.errChan; err != nil {
return fmt.Errorf("failed shut down DHCP client: %w", err)
}
if m.opts.IPv6 {
if err := <-m.errChanV6; err != nil {
return fmt.Errorf("failed shut down DHCPv6 client: %w", err)
}
}
return nil
}

218
pkg/plugin/endpoints.go Normal file
View File

@ -0,0 +1,218 @@
package plugin
import (
"net/http"
"github.com/devplayer0/docker-net-dhcp/pkg/util"
)
// Payloads are based on https://github.com/docker/go-plugins-helpers/blob/master/network/api.go
// CapabilitiesResponse returns whether or not this network is global or local
type CapabilitiesResponse struct {
Scope string
ConnectivityScope string
}
func (p *Plugin) apiGetCapabilities(w http.ResponseWriter, r *http.Request) {
util.JSONResponse(w, CapabilitiesResponse{
Scope: "local",
ConnectivityScope: "global",
}, http.StatusOK)
}
// IPAMData contains IPv4 or IPv6 addressing information
type IPAMData struct {
AddressSpace string
Pool string
Gateway string
AuxAddresses map[string]interface{}
}
// CreateNetworkRequest is sent by the daemon when a network needs to be created
type CreateNetworkRequest struct {
NetworkID string
Options map[string]interface{}
IPv4Data []*IPAMData
IPv6Data []*IPAMData
}
func (p *Plugin) apiCreateNetwork(w http.ResponseWriter, r *http.Request) {
var req CreateNetworkRequest
if err := util.ParseJSONBody(&req, w, r); err != nil {
return
}
if err := p.CreateNetwork(req); err != nil {
util.JSONErrResponse(w, err, 0)
return
}
util.JSONResponse(w, struct{}{}, http.StatusOK)
}
// DeleteNetworkRequest is sent by the daemon when a network needs to be removed
type DeleteNetworkRequest struct {
NetworkID string
}
func (p *Plugin) apiDeleteNetwork(w http.ResponseWriter, r *http.Request) {
var req DeleteNetworkRequest
if err := util.ParseJSONBody(&req, w, r); err != nil {
return
}
if err := p.DeleteNetwork(req); err != nil {
util.JSONErrResponse(w, err, 0)
return
}
util.JSONResponse(w, struct{}{}, http.StatusOK)
}
// EndpointInterface contains endpoint interface information
type EndpointInterface struct {
Address string
AddressIPv6 string
MacAddress string
}
// CreateEndpointRequest is sent by the daemon when an endpoint should be created
type CreateEndpointRequest struct {
NetworkID string
EndpointID string
Interface *EndpointInterface
Options map[string]interface{}
}
// CreateEndpointResponse is sent as a response to a CreateEndpointRequest
type CreateEndpointResponse struct {
Interface *EndpointInterface
}
func (p *Plugin) apiCreateEndpoint(w http.ResponseWriter, r *http.Request) {
var req CreateEndpointRequest
if err := util.ParseJSONBody(&req, w, r); err != nil {
return
}
res, err := p.CreateEndpoint(r.Context(), req)
if err != nil {
util.JSONErrResponse(w, err, 0)
return
}
util.JSONResponse(w, res, http.StatusOK)
}
// InfoRequest is sent by the daemon when querying endpoint information
type InfoRequest struct {
NetworkID string
EndpointID string
}
// InfoResponse is endpoint information sent in response to an InfoRequest
type InfoResponse struct {
Value map[string]string
}
func (p *Plugin) apiEndpointOperInfo(w http.ResponseWriter, r *http.Request) {
var req InfoRequest
if err := util.ParseJSONBody(&req, w, r); err != nil {
return
}
res, err := p.EndpointOperInfo(r.Context(), req)
if err != nil {
util.JSONErrResponse(w, err, 0)
return
}
util.JSONResponse(w, res, http.StatusOK)
}
// DeleteEndpointRequest is sent by the daemon when an endpoint needs to be removed
type DeleteEndpointRequest struct {
NetworkID string
EndpointID string
}
func (p *Plugin) apiDeleteEndpoint(w http.ResponseWriter, r *http.Request) {
var req DeleteEndpointRequest
if err := util.ParseJSONBody(&req, w, r); err != nil {
return
}
if err := p.DeleteEndpoint(req); err != nil {
util.JSONErrResponse(w, err, 0)
return
}
util.JSONResponse(w, struct{}{}, http.StatusOK)
}
// JoinRequest is sent by the Daemon when an endpoint needs be joined to a network
type JoinRequest struct {
NetworkID string
EndpointID string
SandboxKey string
Options map[string]interface{}
}
// InterfaceName consists of the name of the interface in the global netns and
// the desired prefix to be appended to the interface inside the container netns
type InterfaceName struct {
SrcName string
DstPrefix string
}
// StaticRoute contains static route information
type StaticRoute struct {
Destination string
RouteType int
NextHop string
}
// JoinResponse is sent in response to a JoinRequest
type JoinResponse struct {
InterfaceName InterfaceName
Gateway string
GatewayIPv6 string
StaticRoutes []*StaticRoute
DisableGatewayService bool
}
func (p *Plugin) apiJoin(w http.ResponseWriter, r *http.Request) {
var req JoinRequest
if err := util.ParseJSONBody(&req, w, r); err != nil {
return
}
res, err := p.Join(r.Context(), req)
if err != nil {
util.JSONErrResponse(w, err, 0)
return
}
util.JSONResponse(w, res, http.StatusOK)
}
// LeaveRequest is sent by the daemon when a endpoint is leaving a network
type LeaveRequest struct {
NetworkID string
EndpointID string
}
func (p *Plugin) apiLeave(w http.ResponseWriter, r *http.Request) {
var req LeaveRequest
if err := util.ParseJSONBody(&req, w, r); err != nil {
return
}
if err := p.Leave(r.Context(), req); err != nil {
util.JSONErrResponse(w, err, 0)
return
}
util.JSONResponse(w, struct{}{}, http.StatusOK)
}

491
pkg/plugin/network.go Normal file
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@ -0,0 +1,491 @@
package plugin
import (
"context"
"fmt"
"net"
"time"
dTypes "github.com/docker/docker/api/types"
"github.com/mitchellh/mapstructure"
log "github.com/sirupsen/logrus"
"github.com/vishvananda/netlink"
"golang.org/x/sys/unix"
"github.com/devplayer0/docker-net-dhcp/pkg/udhcpc"
"github.com/devplayer0/docker-net-dhcp/pkg/util"
)
// CLIOptionsKey is the key used in create network options by the CLI for custom options
const CLIOptionsKey string = "com.docker.network.generic"
// Implementations of the endpoints described in
// https://github.com/moby/libnetwork/blob/master/docs/remote.md
// CreateNetwork "creates" a new DHCP network (just checks if the provided bridge exists and the null IPAM driver is
// used)
func (p *Plugin) CreateNetwork(r CreateNetworkRequest) error {
log.WithField("options", r.Options).Debug("CreateNetwork options")
opts, err := decodeOpts(r.Options[util.OptionsKeyGeneric])
if err != nil {
return fmt.Errorf("failed to decode network options: %w", err)
}
if opts.Bridge == "" {
return util.ErrBridgeRequired
}
for _, d := range r.IPv4Data {
if d.AddressSpace != "null" || d.Pool != "0.0.0.0/0" {
return util.ErrIPAM
}
}
links, err := netlink.LinkList()
if err != nil {
return fmt.Errorf("failed to retrieve list of network interfaces: %w", err)
}
nets, err := p.docker.NetworkList(context.Background(), dTypes.NetworkListOptions{})
if err != nil {
return fmt.Errorf("failed to retrieve list of networks from Docker: %w", err)
}
found := false
for _, l := range links {
attrs := l.Attrs()
if l.Type() != "bridge" || attrs.Name != opts.Bridge {
continue
}
v4Addrs, err := netlink.AddrList(l, unix.AF_INET)
if err != nil {
return fmt.Errorf("failed to retrieve IPv4 addresses for %v: %w", attrs.Name, err)
}
v6Addrs, err := netlink.AddrList(l, unix.AF_INET6)
if err != nil {
return fmt.Errorf("failed to retrieve IPv6 addresses for %v: %w", attrs.Name, err)
}
addrs := append(v4Addrs, v6Addrs...)
// Make sure the addresses on this bridge aren't used by another network
for _, n := range nets {
for _, c := range n.IPAM.Config {
_, cidr, err := net.ParseCIDR(c.Subnet)
if err != nil {
return fmt.Errorf("failed to parse subnet %v on Docker network %v: %w", c.Subnet, n.ID, err)
}
for _, linkAddr := range addrs {
if linkAddr.IPNet.Contains(cidr.IP) || cidr.Contains(linkAddr.IP) {
return util.ErrBridgeUsed
}
}
}
}
found = true
break
}
if !found {
return util.ErrBridgeNotFound
}
log.WithFields(log.Fields{
"network": r.NetworkID,
"bridge": opts.Bridge,
"ipv6": opts.IPv6,
}).Info("Network created")
return nil
}
// DeleteNetwork "deletes" a DHCP network (does nothing, the bridge is managed by the user)
func (p *Plugin) DeleteNetwork(r DeleteNetworkRequest) error {
log.WithField("network", r.NetworkID).Info("Network deleted")
return nil
}
func vethPairNames(id string) (string, string) {
return "dh-" + id[:12], id[:12] + "-dh"
}
func (p *Plugin) netOptions(ctx context.Context, id string) (DHCPNetworkOptions, error) {
dummy := DHCPNetworkOptions{}
n, err := p.docker.NetworkInspect(ctx, id, dTypes.NetworkInspectOptions{})
if err != nil {
return dummy, fmt.Errorf("failed to get info from Docker: %w", err)
}
opts, err := decodeOpts(n.Options)
if err != nil {
return dummy, fmt.Errorf("failed to parse options: %w", err)
}
return opts, nil
}
// CreateEndpoint creates a veth pair and uses udhcpc to acquire an initial IP address on the container end. Docker will
// move the interface into the container's namespace and apply the address.
func (p *Plugin) CreateEndpoint(ctx context.Context, r CreateEndpointRequest) (CreateEndpointResponse, error) {
log.WithField("options", r.Options).Debug("CreateEndpoint options")
res := CreateEndpointResponse{
Interface: &EndpointInterface{},
}
if r.Interface != nil && (r.Interface.Address != "" || r.Interface.AddressIPv6 != "") {
// TODO: Should we allow static IP's somehow?
return res, util.ErrIPAM
}
opts, err := p.netOptions(ctx, r.NetworkID)
if err != nil {
return res, fmt.Errorf("failed to get network options: %w", err)
}
bridge, err := netlink.LinkByName(opts.Bridge)
if err != nil {
return res, fmt.Errorf("failed to get bridge interface: %w", err)
}
hostName, ctrName := vethPairNames(r.EndpointID)
la := netlink.NewLinkAttrs()
la.Name = hostName
hostLink := &netlink.Veth{
LinkAttrs: la,
PeerName: ctrName,
}
if r.Interface.MacAddress != "" {
addr, err := net.ParseMAC(r.Interface.MacAddress)
if err != nil {
return res, util.ErrMACAddress
}
hostLink.PeerHardwareAddr = addr
}
if err := netlink.LinkAdd(hostLink); err != nil {
return res, fmt.Errorf("failed to create veth pair: %w", err)
}
if err := func() error {
if err := netlink.LinkSetUp(hostLink); err != nil {
return fmt.Errorf("failed to set host side link of veth pair up: %w", err)
}
ctrLink, err := netlink.LinkByName(ctrName)
if err != nil {
return fmt.Errorf("failed to find container side of veth pair: %w", err)
}
if err := netlink.LinkSetUp(ctrLink); err != nil {
return fmt.Errorf("failed to set container side link of veth pair up: %w", err)
}
// Only write back the MAC address if it wasn't provided to us by libnetwork
if r.Interface.MacAddress == "" {
// The kernel will often reset a randomly assigned MAC address after actions like LinkSetMaster. We prevent
// this behaviour by setting it manually to the random value
if err := netlink.LinkSetHardwareAddr(ctrLink, ctrLink.Attrs().HardwareAddr); err != nil {
return fmt.Errorf("failed to set container side of veth pair's MAC address: %w", err)
}
res.Interface.MacAddress = ctrLink.Attrs().HardwareAddr.String()
}
if err := netlink.LinkSetMaster(hostLink, bridge); err != nil {
return fmt.Errorf("failed to attach host side link of veth peer to bridge: %w", err)
}
timeout := defaultLeaseTimeout
if opts.LeaseTimeout != 0 {
timeout = opts.LeaseTimeout
}
initialIP := func(v6 bool) error {
v6str := ""
if v6 {
v6str = "v6"
}
timeoutCtx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
info, err := udhcpc.GetIP(timeoutCtx, ctrName, &udhcpc.DHCPClientOptions{V6: v6})
if err != nil {
return fmt.Errorf("failed to get initial IP%v address via DHCP%v: %w", v6str, v6str, err)
}
ip, err := netlink.ParseAddr(info.IP)
if err != nil {
return fmt.Errorf("failed to parse initial IP%v address: %w", v6str, err)
}
hint := p.joinHints[r.EndpointID]
if v6 {
res.Interface.AddressIPv6 = info.IP
hint.IPv6 = ip
// No gateways in DHCPv6!
} else {
res.Interface.Address = info.IP
hint.IPv4 = ip
hint.Gateway = info.Gateway
}
p.joinHints[r.EndpointID] = hint
return nil
}
if err := initialIP(false); err != nil {
return err
}
if opts.IPv6 {
if err := initialIP(true); err != nil {
return err
}
}
return nil
}(); err != nil {
// Be sure to clean up the veth pair if any of this fails
netlink.LinkDel(hostLink)
return res, err
}
log.WithFields(log.Fields{
"network": r.NetworkID[:12],
"endpoint": r.EndpointID[:12],
"mac_address": res.Interface.MacAddress,
"ip": res.Interface.Address,
"ipv6": res.Interface.AddressIPv6,
"gateway": fmt.Sprintf("%#v", p.joinHints[r.EndpointID].Gateway),
}).Info("Endpoint created")
return res, nil
}
type operInfo struct {
Bridge string `mapstructure:"bridge"`
HostVEth string `mapstructure:"veth_host"`
HostVEthMAC string `mapstructure:"veth_host_mac"`
}
// EndpointOperInfo retrieves some info about an existing endpoint
func (p *Plugin) EndpointOperInfo(ctx context.Context, r InfoRequest) (InfoResponse, error) {
res := InfoResponse{}
opts, err := p.netOptions(ctx, r.NetworkID)
if err != nil {
return res, fmt.Errorf("failed to get network options: %w", err)
}
hostName, _ := vethPairNames(r.EndpointID)
hostLink, err := netlink.LinkByName(hostName)
if err != nil {
return res, fmt.Errorf("failed to find host side of veth pair: %w", err)
}
info := operInfo{
Bridge: opts.Bridge,
HostVEth: hostName,
HostVEthMAC: hostLink.Attrs().HardwareAddr.String(),
}
if err := mapstructure.Decode(info, &res.Value); err != nil {
return res, fmt.Errorf("failed to encode OperInfo: %w", err)
}
return res, nil
}
// DeleteEndpoint deletes the veth pair
func (p *Plugin) DeleteEndpoint(r DeleteEndpointRequest) error {
hostName, _ := vethPairNames(r.EndpointID)
link, err := netlink.LinkByName(hostName)
if err != nil {
return fmt.Errorf("failed to lookup host veth interface %v: %w", hostName, err)
}
if err := netlink.LinkDel(link); err != nil {
return fmt.Errorf("failed to delete veth pair: %w", err)
}
log.WithFields(log.Fields{
"network": r.NetworkID[:12],
"endpoint": r.EndpointID[:12],
}).Info("Endpoint deleted")
return nil
}
func (p *Plugin) addRoutes(v6 bool, bridge netlink.Link, r JoinRequest, hint joinHint, res *JoinResponse) error {
family := unix.AF_INET
if v6 {
family = unix.AF_INET6
}
routes, err := netlink.RouteListFiltered(family, &netlink.Route{
LinkIndex: bridge.Attrs().Index,
Type: unix.RTN_UNICAST,
}, netlink.RT_FILTER_OIF|netlink.RT_FILTER_TYPE)
if err != nil {
return fmt.Errorf("failed to list routes: %w", err)
}
logFields := log.Fields{
"network": r.NetworkID[:12],
"endpoint": r.EndpointID[:12],
"sandbox": r.SandboxKey,
}
for _, route := range routes {
if route.Dst == nil {
// Default route
switch family {
case unix.AF_INET:
if res.Gateway == "" {
res.Gateway = route.Gw.String()
log.
WithFields(logFields).
WithField("gateway", res.Gateway).
Info("[Join] Setting IPv4 gateway retrieved from bridge interface on host routing table")
}
case unix.AF_INET6:
if res.GatewayIPv6 == "" {
res.GatewayIPv6 = route.Gw.String()
log.
WithFields(logFields).
WithField("gateway", res.GatewayIPv6).
Info("[Join] Setting IPv6 gateway retrieved from bridge interface on host routing table")
}
}
continue
}
if route.Protocol == unix.RTPROT_KERNEL ||
(family == unix.AF_INET && route.Dst.Contains(hint.IPv4.IP)) ||
(family == unix.AF_INET6 && route.Dst.Contains(hint.IPv6.IP)) {
// Make sure to leave out the default on-link route created automatically for the IP(s) acquired by DHCP
continue
}
staticRoute := &StaticRoute{
Destination: route.Dst.String(),
// Default to an on-link route
RouteType: 1,
}
res.StaticRoutes = append(res.StaticRoutes, staticRoute)
if route.Gw != nil {
staticRoute.RouteType = 0
staticRoute.NextHop = route.Gw.String()
log.
WithFields(logFields).
WithField("route", staticRoute.Destination).
WithField("gateway", staticRoute.NextHop).
Info("[Join] Adding route (via gateway) retrieved from bridge interface on host routing table")
} else {
log.
WithFields(logFields).
WithField("route", staticRoute.Destination).
Info("[Join] Adding on-link route retrieved from bridge interface on host routing table")
}
}
return nil
}
// Join passes the veth name and route information (gateway from DHCP and existing routes on the host bridge) to Docker
// and starts a persistent DHCP client to maintain the lease on the acquired IP
func (p *Plugin) Join(ctx context.Context, r JoinRequest) (JoinResponse, error) {
log.WithField("options", r.Options).Debug("Join options")
res := JoinResponse{}
opts, err := p.netOptions(ctx, r.NetworkID)
if err != nil {
return res, fmt.Errorf("failed to get network options: %w", err)
}
_, ctrName := vethPairNames(r.EndpointID)
res.InterfaceName = InterfaceName{
SrcName: ctrName,
DstPrefix: opts.Bridge,
}
hint, ok := p.joinHints[r.EndpointID]
if !ok {
return res, util.ErrNoHint
}
delete(p.joinHints, r.EndpointID)
if hint.Gateway != "" {
log.WithFields(log.Fields{
"network": r.NetworkID[:12],
"endpoint": r.EndpointID[:12],
"sandbox": r.SandboxKey,
"gateway": hint.Gateway,
}).Info("[Join] Setting IPv4 gateway retrieved from initial DHCP in CreateEndpoint")
res.Gateway = hint.Gateway
}
bridge, err := netlink.LinkByName(opts.Bridge)
if err != nil {
return res, fmt.Errorf("failed to get bridge interface: %w", err)
}
if err := p.addRoutes(false, bridge, r, hint, &res); err != nil {
return res, err
}
if opts.IPv6 {
if err := p.addRoutes(true, bridge, r, hint, &res); err != nil {
return res, err
}
}
go func() {
// TODO: Make timeout configurable?
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
m := newDHCPManager(p.docker, r, opts)
m.LastIP = hint.IPv4
m.LastIPv6 = hint.IPv6
if err := m.Start(ctx); err != nil {
log.WithError(err).WithFields(log.Fields{
"network": r.NetworkID[:12],
"endpoint": r.EndpointID[:12],
"sandbox": r.SandboxKey,
}).Error("Failed to start persistent DHCP client")
return
}
p.persistentDHCP[r.EndpointID] = m
}()
log.WithFields(log.Fields{
"network": r.NetworkID[:12],
"endpoint": r.EndpointID[:12],
"sandbox": r.SandboxKey,
}).Info("Joined sandbox to endpoint")
return res, nil
}
// Leave stops the persistent DHCP client for an endpoint
func (p *Plugin) Leave(ctx context.Context, r LeaveRequest) error {
manager, ok := p.persistentDHCP[r.EndpointID]
if !ok {
return util.ErrNoSandbox
}
delete(p.persistentDHCP, r.EndpointID)
if err := manager.Stop(); err != nil {
return err
}
log.WithFields(log.Fields{
"network": r.NetworkID[:12],
"endpoint": r.EndpointID[:12],
}).Info("Sandbox left endpoint")
return nil
}

120
pkg/plugin/plugin.go Normal file
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package plugin
import (
"fmt"
"net"
"net/http"
"time"
docker "github.com/docker/docker/client"
"github.com/gorilla/handlers"
"github.com/mitchellh/mapstructure"
"github.com/vishvananda/netlink"
"github.com/devplayer0/docker-net-dhcp/pkg/util"
)
// DriverName is the name of the Docker Network Driver
const DriverName string = "net-dhcp"
const defaultLeaseTimeout = 10 * time.Second
// DHCPNetworkOptions contains options for the DHCP network driver
type DHCPNetworkOptions struct {
Bridge string
IPv6 bool
LeaseTimeout time.Duration `mapstructure:"lease_timeout"`
}
func decodeOpts(input interface{}) (DHCPNetworkOptions, error) {
var opts DHCPNetworkOptions
optsDecoder, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
Result: &opts,
ErrorUnused: true,
WeaklyTypedInput: true,
DecodeHook: mapstructure.ComposeDecodeHookFunc(
mapstructure.StringToTimeDurationHookFunc(),
),
})
if err != nil {
return opts, fmt.Errorf("failed to create options decoder: %w", err)
}
if err := optsDecoder.Decode(input); err != nil {
return opts, err
}
return opts, nil
}
type joinHint struct {
IPv4 *netlink.Addr
IPv6 *netlink.Addr
Gateway string
}
// Plugin is the DHCP network plugin
type Plugin struct {
docker *docker.Client
server http.Server
joinHints map[string]joinHint
persistentDHCP map[string]*dhcpManager
}
// NewPlugin creates a new Plugin
func NewPlugin() (*Plugin, error) {
client, err := docker.NewClient("unix:///run/docker.sock", "v1.13.1", nil, nil)
if err != nil {
return nil, fmt.Errorf("failed to create docker client: %w", err)
}
p := Plugin{
docker: client,
joinHints: make(map[string]joinHint),
persistentDHCP: make(map[string]*dhcpManager),
}
mux := http.NewServeMux()
mux.HandleFunc("/NetworkDriver.GetCapabilities", p.apiGetCapabilities)
mux.HandleFunc("/NetworkDriver.CreateNetwork", p.apiCreateNetwork)
mux.HandleFunc("/NetworkDriver.DeleteNetwork", p.apiDeleteNetwork)
mux.HandleFunc("/NetworkDriver.CreateEndpoint", p.apiCreateEndpoint)
mux.HandleFunc("/NetworkDriver.EndpointOperInfo", p.apiEndpointOperInfo)
mux.HandleFunc("/NetworkDriver.DeleteEndpoint", p.apiDeleteEndpoint)
mux.HandleFunc("/NetworkDriver.Join", p.apiJoin)
mux.HandleFunc("/NetworkDriver.Leave", p.apiLeave)
p.server = http.Server{
Handler: handlers.CustomLoggingHandler(nil, mux, util.WriteAccessLog),
}
return &p, nil
}
// Listen starts the plugin server
func (p *Plugin) Listen(bindSock string) error {
l, err := net.Listen("unix", bindSock)
if err != nil {
return err
}
return p.server.Serve(l)
}
// Close stops the plugin server
func (p *Plugin) Close() error {
if err := p.docker.Close(); err != nil {
return fmt.Errorf("failed to close docker client: %w", err)
}
if err := p.server.Close(); err != nil {
return fmt.Errorf("failed to close http server: %w", err)
}
return nil
}

223
pkg/udhcpc/client.go Normal file
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package udhcpc
import (
"bufio"
"bytes"
"context"
"encoding/binary"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"os/exec"
"runtime"
"syscall"
log "github.com/sirupsen/logrus"
"github.com/vishvananda/netns"
"github.com/devplayer0/docker-net-dhcp/pkg/util"
)
const (
DefaultHandler = "/usr/lib/net-dhcp/udhcpc-handler"
VendorID = "docker-net-dhcp"
)
type DHCPClientOptions struct {
Hostname string
V6 bool
Once bool
Namespace string
HandlerScript string
}
// DHCPClient represents a udhcpc(6) client
type DHCPClient struct {
Opts *DHCPClientOptions
cmd *exec.Cmd
eventPipe io.ReadCloser
}
// NewDHCPClient creates a new udhcpc(6) client
func NewDHCPClient(iface string, opts *DHCPClientOptions) (*DHCPClient, error) {
if opts.HandlerScript == "" {
opts.HandlerScript = DefaultHandler
}
path := "udhcpc"
if opts.V6 {
path = "udhcpc6"
}
c := &DHCPClient{
Opts: opts,
// Foreground, set interface and handler "script"
cmd: exec.Command(path, "-f", "-i", iface, "-s", opts.HandlerScript),
}
stderrPipe, err := c.cmd.StderrPipe()
if err != nil {
return nil, fmt.Errorf("failed to set up udhcpc stderr pipe: %w", err)
}
// Pipe udhcpc stderr (logs) to logrus at debug level
go io.Copy(log.StandardLogger().WriterLevel(log.DebugLevel), stderrPipe)
if c.eventPipe, err = c.cmd.StdoutPipe(); err != nil {
return nil, fmt.Errorf("failed to set up udhcpc stdout pipe: %w", err)
}
if opts.Once {
// Exit after obtaining lease
c.cmd.Args = append(c.cmd.Args, "-q")
} else {
// Release IP address on exit
c.cmd.Args = append(c.cmd.Args, "-R")
}
if opts.Hostname != "" {
hostnameOpt := "hostname:" + opts.Hostname
if opts.V6 {
// TODO: We encode the fqdn for DHCPv6 because udhcpc6 seems to be broken
var data bytes.Buffer
// flags: S bit set (see RFC4704)
binary.Write(&data, binary.BigEndian, uint8(0b0001))
binary.Write(&data, binary.BigEndian, uint8(len(opts.Hostname)))
data.WriteString(opts.Hostname)
hostnameOpt = "0x27:" + hex.EncodeToString(data.Bytes())
}
c.cmd.Args = append(c.cmd.Args, "-x", hostnameOpt)
}
// Vendor ID string option is not available for udhcpc6
if !opts.V6 {
c.cmd.Args = append(c.cmd.Args, "-V", VendorID)
}
log.WithField("cmd", c.cmd).Trace("new udhcpc client")
return c, nil
}
// Start starts udhcpc(6)
func (c *DHCPClient) Start() (chan Event, error) {
if c.Opts.Namespace != "" {
// Lock the OS Thread so we don't accidentally switch namespaces
runtime.LockOSThread()
defer runtime.UnlockOSThread()
origNS, err := netns.Get()
if err != nil {
return nil, fmt.Errorf("failed to open current network namespace: %w", err)
}
defer origNS.Close()
ns, err := netns.GetFromPath(c.Opts.Namespace)
if err != nil {
return nil, fmt.Errorf("failed to open network namespace `%v`: %w", c.Opts.Namespace, err)
}
defer ns.Close()
if err := netns.Set(ns); err != nil {
return nil, fmt.Errorf("failed to enter network namespace: %w", err)
}
// Make sure we go back to the old namespace when we return
defer netns.Set(origNS)
}
if err := c.cmd.Start(); err != nil {
return nil, err
}
events := make(chan Event)
go func() {
scanner := bufio.NewScanner(c.eventPipe)
for scanner.Scan() {
log.WithField("line", string(scanner.Bytes())).Trace("udhcpc handler line")
// Each line is a JSON-encoded event
var event Event
if err := json.Unmarshal(scanner.Bytes(), &event); err != nil {
log.WithError(err).Warn("Failed to decode udhcpc event")
continue
}
events <- event
}
}()
return events, nil
}
// Finish sends SIGTERM to udhcpc(6) and waits for it to exit. SIGTERM will not
// be sent if `Opts.Once` is set.
func (c *DHCPClient) Finish(ctx context.Context) error {
// If only running to get an IP once, udhcpc will terminate on its own
if !c.Opts.Once {
if err := c.cmd.Process.Signal(syscall.SIGTERM); err != nil {
return fmt.Errorf("failed to send SIGTERM to udhcpc: %w", err)
}
}
errChan := make(chan error)
go func() {
errChan <- c.cmd.Wait()
}()
select {
case err := <-errChan:
return err
case <-ctx.Done():
c.cmd.Process.Kill()
return ctx.Err()
}
}
// GetIP is a convenience function that runs udhcpc(6) once and returns the IP
// info obtained.
func GetIP(ctx context.Context, iface string, opts *DHCPClientOptions) (Info, error) {
dummy := Info{}
opts.Once = true
client, err := NewDHCPClient(iface, opts)
if err != nil {
return dummy, fmt.Errorf("failed to create DHCP client: %w", err)
}
events, err := client.Start()
if err != nil {
return dummy, fmt.Errorf("failed to start DHCP client: %w", err)
}
var info *Info
done := make(chan struct{})
go func() {
for {
select {
case event := <-events:
switch event.Type {
case "bound", "renew":
info = &event.Data
}
case <-done:
return
}
}
}()
defer close(done)
if err := client.Finish(ctx); err != nil {
return dummy, err
}
if info == nil {
return dummy, util.ErrNoLease
}
return *info, nil
}

12
pkg/udhcpc/handler.go Normal file
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@ -0,0 +1,12 @@
package udhcpc
type Info struct {
IP string
Gateway string
Domain string
}
type Event struct {
Type string
Data Info
}

5
pkg/util/docker.go Normal file
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package util
const (
OptionsKeyGeneric = "com.docker.network.generic"
)

39
pkg/util/errors.go Normal file
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package util
import (
"errors"
"net/http"
)
var (
// ErrIPAM indicates an unsupported IPAM driver was used
ErrIPAM = errors.New("only the null IPAM driver is supported")
// ErrBridgeRequired indicates a network bridge was not provided for network creation
ErrBridgeRequired = errors.New("bridge required")
// ErrBridgeNotFound indicates that a bridge could not be found
ErrBridgeNotFound = errors.New("bridge not found")
// ErrBridgeUsed indicates that a bridge is already in use
ErrBridgeUsed = errors.New("bridge already in use by Docker")
// ErrMACAddress indicates an invalid MAC address
ErrMACAddress = errors.New("invalid MAC address")
// ErrNoLease indicates a DHCP lease was not obtained from udhcpc
ErrNoLease = errors.New("udhcpc did not output a lease")
// ErrNoHint indicates missing state from the CreateEndpoint stage in Join
ErrNoHint = errors.New("missing CreateEndpoint hints")
// ErrNotVEth indicates a host link was unexpectedly not a veth interface
ErrNotVEth = errors.New("host link is not a veth interface")
// ErrNoContainer indicates a container was unexpectedly not found
ErrNoContainer = errors.New("couldn't find container by endpoint on the network")
// ErrNoSandbox indicates missing state from the Join stage
ErrNoSandbox = errors.New("missing joined endpoint state")
)
func ErrToStatus(err error) int {
switch {
case errors.Is(err, ErrIPAM), errors.Is(err, ErrBridgeRequired), errors.Is(err, ErrBridgeNotFound),
errors.Is(err, ErrBridgeUsed), errors.Is(err, ErrMACAddress):
return http.StatusBadRequest
default:
return http.StatusInternalServerError
}
}

33
pkg/util/general.go Normal file
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@ -0,0 +1,33 @@
package util
import (
"context"
"time"
)
func AwaitCondition(ctx context.Context, cond func() (bool, error), interval time.Duration) error {
errChan := make(chan error)
go func() {
for {
ok, err := cond()
if err != nil {
errChan <- err
return
}
if ok {
errChan <- nil
return
}
time.Sleep(interval)
}
}()
select {
case err := <-errChan:
return err
case <-ctx.Done():
return ctx.Err()
}
}

15
pkg/util/http.go Normal file
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@ -0,0 +1,15 @@
package util
import (
"io"
"github.com/gorilla/handlers"
log "github.com/sirupsen/logrus"
)
func WriteAccessLog(w io.Writer, params handlers.LogFormatterParams) {
log.WithFields(log.Fields{
"status": params.StatusCode,
"resSize": params.Size,
}).Tracef("%v %v", params.Request.Method, params.URL.RequestURI())
}

61
pkg/util/json.go Normal file
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@ -0,0 +1,61 @@
package util
import (
"encoding/json"
"fmt"
"net/http"
log "github.com/sirupsen/logrus"
)
// JSONResponse Sends a JSON payload in response to a HTTP request
func JSONResponse(w http.ResponseWriter, v interface{}, statusCode int) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(statusCode)
if err := json.NewEncoder(w).Encode(v); err != nil {
log.WithField("err", err).Error("Failed to serialize JSON payload")
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprint(w, "Failed to serialize JSON payload")
}
}
type jsonError struct {
Message string `json:"Err"`
}
// JSONErrResponse Sends an `error` as a JSON object with a `message` property
func JSONErrResponse(w http.ResponseWriter, err error, statusCode int) {
log.WithError(err).Error("Error while processing request")
w.Header().Set("Content-Type", "application/problem+json")
if statusCode == 0 {
statusCode = ErrToStatus(err)
}
w.WriteHeader(statusCode)
enc := json.NewEncoder(w)
enc.Encode(jsonError{err.Error()})
}
// ParseJSONBody attempts to parse the request body as JSON
func ParseJSONBody(v interface{}, w http.ResponseWriter, r *http.Request) error {
//data, err := io.ReadAll(r.Body)
//if err != nil {
// JSONErrResponse(w, fmt.Errorf("failed to read request body: %w", err), 0)
// return err
//}
//log.WithField("body", string(data)).Debug("request body")
d := json.NewDecoder(r.Body)
d.DisallowUnknownFields()
if err := d.Decode(v); err != nil {
//if err := json.Unmarshal(data, v); err != nil {
JSONErrResponse(w, fmt.Errorf("failed to parse request body: %w", err), http.StatusBadRequest)
return err
}
return nil
}

66
pkg/util/netlink.go Normal file
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package util
import (
"context"
"time"
log "github.com/sirupsen/logrus"
"github.com/vishvananda/netlink"
"github.com/vishvananda/netns"
)
func AwaitNetNS(ctx context.Context, path string, interval time.Duration) (netns.NsHandle, error) {
var err error
nsChan := make(chan netns.NsHandle)
go func() {
for {
var ns netns.NsHandle
ns, err = netns.GetFromPath(path)
if err == nil {
nsChan <- ns
return
}
time.Sleep(interval)
}
}()
var dummy netns.NsHandle
select {
case ns := <-nsChan:
return ns, nil
case <-ctx.Done():
if err != nil {
log.WithError(err).WithField("path", path).Error("Failed to await network namespace")
}
return dummy, ctx.Err()
}
}
func AwaitLinkByIndex(ctx context.Context, handle *netlink.Handle, index int, interval time.Duration) (netlink.Link, error) {
var err error
linkChan := make(chan netlink.Link)
go func() {
for {
var link netlink.Link
link, err = handle.LinkByIndex(index)
if err == nil {
linkChan <- link
return
}
time.Sleep(interval)
}
}()
var dummy netlink.Link
select {
case link := <-linkChan:
return link, nil
case <-ctx.Done():
if err != nil {
log.WithError(err).WithField("index", index).Error("Failed to await link by index")
}
return dummy, ctx.Err()
}
}

View File

@ -1,5 +0,0 @@
flask==1.1.1
pyroute2==0.5.6
docker==4.0.2
eventfd==0.2
posix_ipc==1.0.4

204
scripts/push_multiarch_plugin.py Executable file
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#!/usr/bin/env python3
import json
import hashlib
import argparse
import os
import tempfile
import gzip
import tarfile
import concurrent.futures
import requests
from docker_image import reference
import dxf
MTYPE_PLUGIN_CONFIG = 'application/vnd.docker.plugin.v1+json'
MTYPE_LAYER = 'application/vnd.docker.image.rootfs.diff.tar.gzip'
MTYPE_MANIFEST = 'application/vnd.docker.distribution.manifest.v2+json'
MTYPE_MANIFEST_LIST = 'application/vnd.docker.distribution.manifest.list.v2+json'
class Platform:
def __init__(self, s):
self.buildx = s
split = s.split('/')
if len(split) < 2:
raise Exception('Invalid platform format')
self.dirname = '_'.join(split)
self.os = split[0]
self.architecture = split[1]
self.variant = None
if len(split) > 3:
raise Exception('Invalid platform format')
elif len(split) == 3:
self.variant = split[2]
elif self.architecture == 'arm64':
# Weird exception? (seen in alpine images)
self.variant = 'v8'
@property
def manifest(self):
d = {
'os': self.os,
'architecture': self.architecture,
}
if self.variant is not None:
d['variant'] = self.variant
return d
@property
def tag(self):
if self.variant is not None:
return f'{self.os}-{self.architecture}-{self.variant}'
return f'{self.os}-{self.architecture}'
def __str__(self):
return f'Platform(os={self.os}, architecture={self.architecture}, variant={self.variant})'
def __repr__(self):
return str(self)
def dxf_auth(reg: dxf.DXF, res):
reg.authenticate(username=os.getenv('REGISTRY_USERNAME'), password=os.getenv('REGISTRY_PASSWORD'), response=res)
class DXF(dxf.DXF):
def set_manifest(self, alias, manifest_json, mime=MTYPE_MANIFEST):
"""
Give a name (alias) to a manifest.
:param alias: Alias name
:type alias: str
:param manifest_json: A V2 Schema 2 manifest JSON string
:type digests: list
"""
self._request('put',
'manifests/' + alias,
data=manifest_json,
headers={'Content-Type': mime})
def push_manifest(self, manifest_dict, ref=None, mime=MTYPE_MANIFEST):
mf = json.dumps(manifest_dict, sort_keys=True).encode('utf-8')
size = len(mf)
digest = dxf.hash_bytes(mf)
if ref is None:
ref = digest
self.set_manifest(ref, mf, mime=mime)
return size, digest
def tar_filter(p: Platform):
def f(info: tarfile.TarInfo):
# Ensure there's no directory called '/'
if info.name == '':
info.name = '.'
# buildx messes up symlink targets...
platform_prefix = f'/{p.dirname}'
if info.issym() and info.linkname.startswith(platform_prefix):
info.linkname = info.linkname[len(platform_prefix):]
return info
return f
def main():
parser = argparse.ArgumentParser(description='Construct and push a multiarch Docker plugin')
parser.add_argument('config', help='plugin config.json')
parser.add_argument('rootfs', help='buildx rootfs parent directory')
parser.add_argument('image', help='target image (registry/image:tag)')
parser.add_argument('-p', '--platforms', default='linux/amd64', help='buildx platforms')
args = parser.parse_args()
platforms = [Platform(p) for p in args.platforms.split(',')]
ref = reference.Reference.parse(args.image)
hostname, repo = ref.split_hostname()
tag = ref['tag']
reg = DXF(hostname, repo, auth=dxf_auth)
#print(reg.list_aliases())
print(f'Pushing config file `{args.config}`')
config_size = os.path.getsize(args.config)
config_digest = reg.push_blob(filename=args.config, check_exists=True)
print(f'Pushed config as {config_digest}')
def push_platform(p):
#with open(f'/tmp/{p.dirname}.tar.gz', mode='w+b') as f:
with tempfile.TemporaryFile(mode='w+b', suffix='.tar.gz') as f:
tar_name = f'{p.dirname}.tar'
# Use gzip separately to force mtime=0 (deterministic gzipping!)
with gzip.GzipFile(filename=tar_name, mode='w', fileobj=f, mtime=0) as gz:
with tarfile.open(name=tar_name, mode='w', fileobj=gz) as tar:
path = os.path.join(args.rootfs, p.dirname)
print(f"tar'ing and gzip'ing {path}")
tar.add(path, arcname='', filter=tar_filter(p))
f.seek(0, os.SEEK_SET)
sha256 = hashlib.sha256()
for chunk in iter(lambda: f.read(8192), b''):
sha256.update(chunk)
h = 'sha256:' + sha256.hexdigest()
layer_size = f.tell()
f.seek(0, os.SEEK_SET)
print(f'Pushing {p.buildx} layer')
layer_digest = reg.push_blob(data=f, digest=h, check_exists=True)
print(f'Pushed {p.buildx} layer as {layer_digest}')
platform_tag = f'{tag}-{p.tag}'
print(f'Pushing {p.buildx} manifest with tag {platform_tag}')
size, digest = reg.push_manifest({
'schemaVersion': 2,
'mediaType': MTYPE_MANIFEST,
'config': {
'mediaType': MTYPE_PLUGIN_CONFIG,
'size': config_size,
'digest': config_digest,
},
'layers': [
{
'mediaType': MTYPE_LAYER,
'size': layer_size,
'digest': layer_digest,
}
],
}, ref=platform_tag)
print(f'Pushed {p.buildx} manifest with digest {digest}')
return size, digest
mf_list = {
'schemaVersion': 2,
'mediaType': MTYPE_MANIFEST_LIST,
'manifests': [],
}
with concurrent.futures.ThreadPoolExecutor() as executor:
fs = {executor.submit(push_platform, p): p for p in platforms}
for f in concurrent.futures.as_completed(fs):
p = fs[f]
try:
size, digest = f.result()
except Exception as ex:
print(f'Exception pushing `{p.buildx}`: {ex}')
continue
mf_list['manifests'].append({
'mediaType': MTYPE_MANIFEST,
'size': size,
'digest': digest,
'platform': p.manifest,
})
print(f'Pushing {args.image} manifest list')
reg.push_manifest(mf_list, ref=tag, mime=MTYPE_MANIFEST_LIST)
print(f'Pushed {args.image}')
if __name__ == '__main__':
main()

2
scripts/requirements.txt Normal file
View File

@ -0,0 +1,2 @@
python-dxf>7, <8
docker-image-py>0.1,<0.2

38
test_env.sh Executable file
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@ -0,0 +1,38 @@
#!/bin/sh
BRIDGE=net-dhcp
BRIDGE_IP="10.123.0.1"
DUMMY_IP="10.123.0.3"
MASK="24"
DHCP_RANGE="10.123.0.5,10.123.0.254,10s"
BRIDGE_IP6="fd69::1"
DUMMY_IP6="fd69::3"
MASK6="64"
DHCP6_RANGE="fd69::5,fd69::1000,64,10s"
DOMAIN=cool-dhcp
quit() {
ip link del "$BRIDGE"
exit
}
trap quit SIGINT SIGTERM
ip link add "$BRIDGE" type bridge
ip link set up dev "$BRIDGE"
ip addr add "$BRIDGE_IP/$MASK" dev "$BRIDGE"
ip addr add "$BRIDGE_IP6/$MASK6" dev "$BRIDGE"
ip route add 10.223.0.0/24 dev "$BRIDGE"
ip route add 10.224.0.0/24 via "$DUMMY_IP"
ip route add fd42::0/64 dev "$BRIDGE"
# TODO: This doesn't work right now because the route is added by Docker before
# router advertisement stuff is done :/
#ip route add fd43::0/64 via "$DUMMY_IP6"
dnsmasq --no-daemon --conf-file=/dev/null --dhcp-leasefile=/tmp/docker-net-dhcp.leases \
--port=0 --interface="$BRIDGE" --bind-interfaces \
--domain="$DOMAIN" \
--dhcp-range="$DHCP_RANGE" \
--dhcp-range="$DHCP6_RANGE" --enable-ra
quit