Initial Commit
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4a82c7db0e
GPG Key ID:
852BCC170D81A982
15
.editorconfig
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15
.editorconfig
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# EditorConfig is awesome: https://EditorConfig.org
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# top-most EditorConfig file
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root = true
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[*]
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indent_style = space
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indent_size = 2
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end_of_line = lf
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charset = utf-8
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trim_trailing_whitespace = true
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insert_final_newline = false
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[Makefile]
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indent_style = tab
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1
.gitignore
vendored
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1
.gitignore
vendored
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getpsrc
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28
.golangci.yml
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28
.golangci.yml
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run:
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skip-dirs:
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- it
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timeout: 10m
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tests: true
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linters:
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disable-all: true
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enable:
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# Default
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- deadcode
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- errcheck
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- gosimple
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- govet
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- ineffassign
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- staticcheck
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- structcheck
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- typecheck
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- unused
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- varcheck
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# Additionally linters
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- bodyclose
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- misspell
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- nilerr
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- rowserrcheck
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- sqlclosecheck
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- unparam
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32
Dockerfile
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32
Dockerfile
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ARG BASE_IMAGE
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ARG BUILD_IMAGE
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# BUILD
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# =====================================================================
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FROM ${BUILD_IMAGE} AS build
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ARG GONOPROXY
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ARG GONOSUMDB
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ARG GOPRIVATE
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ARG GOPROXY
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ARG GOSUMDB
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ARG VERSION
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COPY ./ /workspace
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RUN cd /workspace && \
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GONOPROXY=${GONOPROXY} \
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GONOSUMDB=${GONOSUMDB} \
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GOPRIVATE=${GOPRIVATE} \
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GOPROXY=${GOPROXY} \
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GOSUMDB=${GOSUMDB} \
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VERSION=${VERSION} \
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make all
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# TARGET
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# =====================================================================
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FROM ${BASE_IMAGE}
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COPY --from=build /workspace/getpsrc /usr/bin/getpsrc
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ENTRYPOINT [ "/usr/bin/getpsrc" ]
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13
LICENSE
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13
LICENSE
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Copyright 2019 Markus Pesch
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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126
Makefile
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126
Makefile
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# VERSION
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VERSION?=$(shell git describe --abbrev=0)+hash.$(shell git rev-parse --short HEAD)
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# CONTAINER_RUNTIME
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CONTAINER_RUNTIME?=$(shell which docker)
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# BUILD_IMAGE
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BUILD_IMAGE_REGISTRY_HOST?=docker.io
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BUILD_IMAGE_NAMESPACE=library
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BUILD_IMAGE_REPOSITORY=golang
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BUILD_IMAGE_VERSION?=1.16
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BUILD_IMAGE_FULLY_QUALIFIED:=${BUILD_IMAGE_REGISTRY_HOST}/${BUILD_IMAGE_NAMESPACE}/${BUILD_IMAGE_REPOSITORY}:${BUILD_IMAGE_VERSION}
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# BASE_IMAGE
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BASE_IMAGE_REGISTRY_HOST?=docker.io
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BASE_IMAGE_NAMESPACE=library
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BASE_IMAGE_REPOSITORY=busybox
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BASE_IMAGE_VERSION?=latest
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BASE_IMAGE_FULLY_QUALIFIED=${BASE_IMAGE_REGISTRY_HOST}/${BASE_IMAGE_NAMESPACE}/${BASE_IMAGE_REPOSITORY}:${BASE_IMAGE_VERSION}
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# CONTAINER_IMAGE
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CONTAINER_IMAGE_REGISTRY_HOST?=docker.io
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CONTAINER_IMAGE_NAMESPACE=volkerraschek
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CONTAINER_IMAGE_REPOSITORY=getpsrc
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CONTAINER_IMAGE_VERSION?=latest
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CONTAINER_IMAGE_FULLY_QUALIFIED=${CONTAINER_IMAGE_REGISTRY_HOST}/${CONTAINER_IMAGE_NAMESPACE}/${CONTAINER_IMAGE_REPOSITORY}:${CONTAINER_IMAGE_VERSION}
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CONTAINER_IMAGE_UNQUALIFIED=${CONTAINER_IMAGE_NAMESPACE}/${CONTAINER_IMAGE_REPOSITORY}:${CONTAINER_IMAGE_VERSION}
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# EXECUTABLES
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# ==============================================================================
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EXECUTABLE_TARGETS=getpsrc
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PHONY=all
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all: clean ${EXECUTABLE_TARGETS}
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getpsrc:
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GOPRIVATE=$(shell go env GOPRIVATE) \
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GOPROXY=$(shell go env GOPROXY) \
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GONOPROXY=$(shell go env GONOPROXY) \
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GONOSUMDB=$(shell go env GONOSUMDB) \
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GOSUMDB=$(shell go env GOSUMDB) \
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go build -tags netgo -ldflags "-X main.version=${VERSION}" -o ${@} main.go
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# CLEAN
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# ==============================================================================
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PHONY+=clean
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clean:
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rm --force --recursive $(shell pwd)/getpsrc*
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# GOLANGCI-LINT
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# ==============================================================================
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PHONY+=golangci-lint
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golangci-lint:
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golangci-lint run --concurrency=$(shell nproc)
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# GOSEC
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# ==============================================================================
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PHONY+=gosec
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gosec:
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gosec $(shell pwd)/...
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# CONTAINER-IMAGE
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# ==============================================================================
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PHONY+=container-image/build
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container-image/build:
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${CONTAINER_RUNTIME} build \
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--build-arg BASE_IMAGE=${BASE_IMAGE_FULLY_QUALIFIED} \
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--build-arg BUILD_IMAGE=${BUILD_IMAGE_FULLY_QUALIFIED} \
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--build-arg GOPRIVATE=$(shell go env GOPRIVATE) \
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--build-arg GOPROXY=$(shell go env GOPROXY) \
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--build-arg GONOPROXY=$(shell go env GONOPROXY) \
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--build-arg GONOSUMDB=$(shell go env GONOSUMDB) \
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--build-arg GOSUMDB=$(shell go env GOSUMDB) \
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--build-arg VERSION=${VERSION} \
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--file ./Dockerfile \
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--no-cache \
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--tag ${CONTAINER_IMAGE_UNQUALIFIED} \
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--tag ${CONTAINER_IMAGE_FULLY_QUALIFIED} \
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.
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PHONY+=container-image/push
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container-image/push: container-image/build
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${CONTAINER_RUNTIME} push ${CONTAINER_IMAGE_FULLY_QUALIFIED}
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# CONTAINER STEPS - EXECUTABLE
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# ==============================================================================
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PHONY+=container-run/all
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container-run/all:
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$(MAKE) container-run COMMAND=${@:container-run/%=%}
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PHONY+=${EXECUTABLE_TARGETS:%=container-run/%}
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${EXECUTABLE_TARGETS:%=container-run/%}:
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$(MAKE) container-run COMMAND=${@:container-run/%=%}
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# CONTAINER STEPS - CLEAN
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# ==============================================================================
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PHONY+=container-run/clean
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container-run/clean:
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$(MAKE) container-run COMMAND=${@:container-run/%=%}
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# GENERAL CONTAINER COMMAND
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# ==============================================================================
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PHONY+=container-run
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container-run:
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${CONTAINER_RUNTIME} run \
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--env CONTAINER_IMAGE_VERSION=${CONTAINER_IMAGE_VERSION} \
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--env GONOPROXY=$(shell go env GONOPROXY) \
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--env GONOSUMDB=$(shell go env GONOSUMDB) \
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--env GOPRIVATE=$(shell go env GOPRIVATE) \
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--env GOPROXY=$(shell go env GOPROXY) \
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--env GOSUMDB=$(shell go env GOSUMDB) \
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--env VERSION=${VERSION} \
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--net=host \
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--rm \
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--volume /tmp:/tmp \
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--volume ${HOME}/go:/root/go \
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--volume $(shell pwd):/workspace \
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--workdir /workspace \
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${BUILD_IMAGE_FULLY_QUALIFIED} \
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make ${COMMAND}
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# PHONY
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# ==============================================================================
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# Declare the contents of the PHONY variable as phony. We keep that information
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# in a variable so we can use it in if_changed.
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.PHONY: ${PHONY}
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7
README.md
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7
README.md
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# getpsrc
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`getpsrc` is a small programme to determine the src routing ip for an external ip.
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`getpsrc` serves as an alternative to `ip route get <ip> | awk ... ` because `ip
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route get` can return different output depending on the environment and
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therefore the construct is unsafe.
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5
go.mod
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5
go.mod
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module github.com/volker-raschek/getpsrc
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go 1.16
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require github.com/google/gopacket v1.1.20-0.20210429153827-3eaba0894325
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21
go.sum
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21
go.sum
Normal file
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github.com/google/gopacket v1.1.19 h1:ves8RnFZPGiFnTS0uPQStjwru6uO6h+nlr9j6fL7kF8=
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github.com/google/gopacket v1.1.19/go.mod h1:iJ8V8n6KS+z2U1A8pUwu8bW5SyEMkXJB8Yo/Vo+TKTo=
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github.com/google/gopacket v1.1.20-0.20210429153827-3eaba0894325 h1:YmIcZ5Var3BAQ64AW98Iiys5Ih4fiU0xK41+8isC5Ec=
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github.com/google/gopacket v1.1.20-0.20210429153827-3eaba0894325/go.mod h1:riddUzxTSBpJXk3qBHtYr4qOhFhT6k/1c0E3qkQjQpA=
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github.com/vishvananda/netlink v1.1.0/go.mod h1:cTgwzPIzzgDAYoQrMm0EdrjRUBkTqKYppBueQtXaqoE=
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github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df/go.mod h1:JP3t17pCcGlemwknint6hfoeCVQrEMVwxRLRjXpq+BU=
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github.com/vishvananda/netns v0.0.0-20210104183010-2eb08e3e575f/go.mod h1:DD4vA1DwXk04H54A1oHXtwZmA0grkVMdPxx/VGLCah0=
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golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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golang.org/x/lint v0.0.0-20200302205851-738671d3881b/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
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golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
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golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20190606203320-7fc4e5ec1444/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20200217220822-9197077df867/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
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golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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40
main.go
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40
main.go
Normal file
@ -0,0 +1,40 @@
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package main
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import (
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"fmt"
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"log"
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"net"
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"os"
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"strings"
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"github.com/google/gopacket/routing"
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)
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func main() {
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ips := os.Args[1:]
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switch {
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case len(ips) == 0:
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log.Fatal("Expect exactly one argument")
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case len(ips) >= 2:
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log.Fatal("Expect only one argument")
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}
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rawIP := strings.Split(ips[0], "/")[0]
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ip := net.ParseIP(rawIP)
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if ip == nil {
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log.Fatal("failed to parse raw ip")
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}
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router, err := routing.New()
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if err != nil {
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log.Fatalf("failed to get new routing instance: %v", err.Error())
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}
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_, _, prefferedSrc, err := router.Route(ip)
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if err != nil {
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log.Fatalf("failed to find gateway for ip: %v", err.Error())
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}
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fmt.Fprintln(os.Stdout, prefferedSrc.String())
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}
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