Add endopoint to check is a given port is open on the client (#22)

Bumps [github.com/containerd/containerd](https://github.com/containerd/containerd) from 1.7.7 to 1.7.11.
- [Release notes](https://github.com/containerd/containerd/releases)
- [Changelog](https://github.com/containerd/containerd/blob/main/RELEASES.md)
- [Commits](https://github.com/containerd/containerd/compare/v1.7.7...v1.7.11)

---
updated-dependencies:
- dependency-name: github.com/containerd/containerd
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,52 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ "main" ]
+  schedule:
+    - cron: '21 21 * * 0'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    - name: install go
+      uses: actions/setup-go@v3
+      with:
+        go-version-file: go.mod
+        cache: true
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        languages: go
+
+    - run: |
+       echo "Build"
+       make build
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2

.github/workflows/main.yml

@@ -11,19 +11,19 @@ on:
 jobs:
   tests:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        make: ["lint", "test"]
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
 
       - name: install go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
-          go-version: "^1.18"
+          go-version-file: go.mod
 
-      - name: Lint
+      - name: ${{ matrix.make }}
-        run: make lint
+        run: make ${{ matrix.make }}
-
-      - name: Tests
-        run: make test
 
   deploy:
     runs-on: ubuntu-latest
@@ -33,9 +33,14 @@ jobs:
       matrix:
         goosarch: [linux-amd64]
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0
+      - name: install go
+        uses: actions/setup-go@v3
+        with:
+          go-version-file: go.mod
+          cache: true
 
       - name: Set env
         run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
@@ -56,7 +61,7 @@ jobs:
           sha256sum whatismyip-$RELEASE_VERSION-${{matrix.goosarch}}.tar.gz > whatismyip-$RELEASE_VERSION-${{matrix.goosarch}}.tar.gz.sha256
 
       - name: Release
-        uses: softprops/action-gh-release@v0.1.14
+        uses: softprops/action-gh-release@v1
         with:
           body_path: changelog.txt
           files: |

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.18-alpine as builder
+FROM golang:1.21-alpine as builder
 
 ARG ARG_VERSION
 ENV VERSION $ARG_VERSION
@@ -7,7 +7,8 @@ WORKDIR /app
 
 COPY . .
 
-RUN apk add make git && make build VERSION=$VERSION
+RUN apk add make git upx && make build VERSION=$VERSION \
+    && upx --best --lzma whatismyip
 
 # Build final image
 FROM scratch

Makefile

@@ -7,29 +7,24 @@ test: unit-test integration-test
 
 .PHONY: unit-test
 unit-test:
-	go test -race -short -cover ./...
+	go test -count=1 -race -short -cover ./...
 
 .PHONY: integration-test
 integration-test:
-	go test ./integration-tests -v
+	go test -count=1 -v ./integration-tests
 
 .PHONY: install-tools
 install-tools:
 	@command golangci-lint > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
-		curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(GOPATH)/bin v1.45.0; \
+		curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(GOPATH)/bin; \
 	fi
 
 	@command $(GOPATH)/shadow > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
-		go install golang.org/x/tools/go/analysis/passes/shadow/cmd/shadow@v0.1.10; \
+		go install golang.org/x/tools/go/analysis/passes/shadow/cmd/shadow@latest; \
-	fi
-
-	@command $(GOPATH)/golines > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
-		go install github.com/segmentio/golines@latest; \
 	fi
 .PHONY: lint
 lint: install-tools
 	gofmt -l . && test -z $$(gofmt -l .)
-	golines -l . && test -z $$(golines -l .)
 	golangci-lint run
 	shadow ./...
 

README.md

@@ -1,6 +1,7 @@
 # What is my IP address
 
 [![CI](https://github.com/dcarrillo/whatismyip/workflows/CI/badge.svg)](https://github.com/dcarrillo/whatismyip/actions)
+[![CodeQL](https://github.com/dcarrillo/whatismyip/actions/workflows/codeql-analysis.yml/badge.svg)](https://github.com/dcarrillo/whatismyip/actions/workflows/codeql-analysis.yml)
 [![Go Report Card](https://goreportcard.com/badge/github.com/dcarrillo/whatismyip)](https://goreportcard.com/report/github.com/dcarrillo/whatismyip)
 [![GitHub release](https://img.shields.io/github/release/dcarrillo/whatismyip.svg)](https://github.com/dcarrillo/whatismyip/releases/)
 [![License Apache 2.0](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](./LICENSE)
@@ -13,13 +14,15 @@
   - [Examples](#examples)
     - [Run a default TCP server](#run-a-default-tcp-server)
     - [Run a TLS (HTTP/2) server only](#run-a-tls-http2-server-only)
-    - [Run a default TCP server with a custom template and trust a custom header set by an upstream proxy](#run-a-default-tcp-server-with-a-custom-template-and-trust-a-custom-header-set-by-an-upstream-proxy)
+    - [Run an HTTP/3 server](#run-an-http3-server)
+    - [Run a default TCP server with a custom template and trust a pair of custom headers set by an upstream proxy](#run-a-default-tcp-server-with-a-custom-template-and-trust-a-pair-of-custom-headers-set-by-an-upstream-proxy)
   - [Download](#download)
   - [Docker](#docker)
     - [Run a container locally using test databases](#run-a-container-locally-using-test-databases)
     - [From Docker Hub](#from-docker-hub)
 
-Just another "what is my IP address" service, including geolocation and headers information, written in go with high performance in mind, it uses [gin](https://github.com/gin-gonic/gin) which uses [httprouter](https://github.com/julienschmidt/httprouter) a lightweight high performance HTTP multiplexer.
+Just another "what is my IP address" service, including geolocation, TCP open port checking, and headers information. Written in go with high performance in mind,
+it uses [gin](https://github.com/gin-gonic/gin) which uses [httprouter](https://github.com/julienschmidt/httprouter) a lightweight high performance HTTP multiplexer.
 
 Take a look at [ifconfig.es](https://ifconfig.es) a live site using `whatismyip`
 
@@ -36,18 +39,21 @@ curl -6 ifconfig.es
 ## Features
 
 - TLS and HTTP/2.
-- Can run behind a proxy by trusting a custom header (usually `X-Real-IP`) to figure out the source IP address.
+- Experimental HTTP/3 support. HTTP/3 requires a TLS server running (`-tls-bind`), as HTTP/3 starts as a TLS connection that then gets upgraded to UDP. The UDP port is the same as the one used for the TLS server.
+- Can run behind a proxy by trusting a custom header (usually `X-Real-IP`) to figure out the source IP address. It also supports a custom header to resolve the client port, if the proxy can only add a header for the IP (for example a fixed header from CDNs) the client port is shown as unknown.
 - IPv4 and IPv6.
 - Geolocation info including ASN. This feature is possible thanks to [maxmind](https://dev.maxmind.com/geoip/geolite2-free-geolocation-data?lang=en) GeoLite2 databases. In order to use these databases, a license key is needed. Please visit Maxmind site for further instructions and get a free license.
+- Checking TCP open ports.
 - High performance.
-- Self-contained server what can reload GeoLite2 databases and/or SSL certificates without stop/start. The `hup` signal is honored.
+- Self-contained server that can reload GeoLite2 databases and/or SSL certificates without stop/start. The `hup` signal is honored.
 - HTML templates for the landing page.
 - Text plain and JSON output.
 
 ## Endpoints
 
 - https://ifconfig.es/
-- https://ifconfig.es/json
+- https://ifconfig.es/client-port
+- https://ifconfig.es/json (this is the same as `curl -H "Accept: application/json" https://ifconfig.es/`)
 - https://ifconfig.es/geo
   - https://ifconfig.es/geo/city
   - https://ifconfig.es/geo/country
@@ -62,19 +68,24 @@ curl -6 ifconfig.es
 - https://ifconfig.es/all
 - https://ifconfig.es/headers
   - https://ifconfig.es/<header_name>
+- https://ifconfig.es/scan/tcp/<port_number>
 
 ## Build
 
-Golang >= 1.17 is required. Previous versions may work.
+Golang >= 1.19 is required.
 
 `make build`
 
 ## Usage
 
 ```text
-Usage of ./whatismyip:
+Usage of whatismyip:
   -bind string
         Listening address (see https://pkg.go.dev/net?#Listen) (default ":8080")
+  -enable-http3
+        Enable HTTP/3 protocol. HTTP/3 requires --tls-bind set, as HTTP/3 starts as a TLS connection that then gets upgraded to UDP. The UDP port is the same as the one used for the TLS server.
+  -enable-secure-headers
+        Add sane security-related headers to every response
   -geoip2-asn string
         Path to GeoIP2 ASN database
   -geoip2-city string
@@ -88,7 +99,9 @@ Usage of ./whatismyip:
   -tls-key string
         When using TLS, path to private key file
   -trusted-header string
-        Trusted request header for remote IP (e.g. X-Real-IP)
+        Trusted request header for remote IP (e.g. X-Real-IP). When using this feature if -trusted-port-header is not set the client port is shown as 'unknown'
+  -trusted-port-header string
+        Trusted request header for remote client port (e.g. X-Real-Port). When this parameter is set -trusted-header becomes mandatory
   -version
         Output version information and exit
 ```
@@ -108,20 +121,27 @@ Usage of ./whatismyip:
              -bind "" -tls-bind :8081 -tls-crt ./test/server.pem -tls-key ./test/server.key
 ```
 
-### Run a default TCP server with a custom template and trust a custom header set by an upstream proxy
+### Run an HTTP/3 server
 
 ```bash
 ./whatismyip -geoip2-city ./test/GeoIP2-City-Test.mmdb -geoip2-asn ./test/GeoLite2-ASN-Test.mmdb \
-             -trusted-header X-Real-IP -template mytemplate.tmpl
+             -bind "" -tls-bind :8081 -tls-crt ./test/server.pem -tls-key ./test/server.key -enable-http3
+```
+
+### Run a default TCP server with a custom template and trust a pair of custom headers set by an upstream proxy
+
+```bash
+./whatismyip -geoip2-city ./test/GeoIP2-City-Test.mmdb -geoip2-asn ./test/GeoLite2-ASN-Test.mmdb \
+             -trusted-header X-Real-IP -trusted-port-header X-Real-Port -template mytemplate.tmpl
 ```
 
 ## Download
 
-Download latest version from https://github.com/dcarrillo/whatismyip/releases
+Download the latest version from https://github.com/dcarrillo/whatismyip/releases
 
 ## Docker
 
-An ultra-light (~9MB) image is available.
+An ultra-light (~4MB) image is available on [docker hub](https://hub.docker.com/r/dcarrillo/whatismyip). Since version `2.1.2`, the binary is compressed using [upx](https://github.com/upx/upx).
 
 ### Run a container locally using test databases
 

cmd/whatismyip.go

@@ -2,28 +2,18 @@ package main
 
 import (
 	"context"
-	"errors"
 	"flag"
 	"fmt"
-	"log"
-	"net/http"
 	"os"
-	"os/signal"
-	"syscall"
 
 	"github.com/dcarrillo/whatismyip/internal/httputils"
 	"github.com/dcarrillo/whatismyip/internal/setting"
+	"github.com/dcarrillo/whatismyip/server"
+	"github.com/gin-contrib/secure"
+
 	"github.com/dcarrillo/whatismyip/models"
 	"github.com/dcarrillo/whatismyip/router"
-
 	"github.com/gin-gonic/gin"
-	"github.com/unrolled/secure"
-)
-
-var (
-	tcpServer *http.Server
-	tlsServer *http.Server
-	engine    *gin.Engine
 )
 
 func main() {
@@ -32,135 +22,36 @@ func main() {
 		fmt.Print(o)
 		os.Exit(0)
 	} else if err != nil {
-		fmt.Print(err)
+		fmt.Println(err)
 		os.Exit(1)
 	}
 
 	models.Setup(setting.App.GeodbPath.City, setting.App.GeodbPath.ASN)
-	setupEngine()
+	engine := setupEngine()
 	router.SetupTemplate(engine)
 	router.Setup(engine)
 
-	if setting.App.BindAddress != "" {
+	whatismyip := server.Setup(context.Background(), engine.Handler())
-		runTCPServer()
+	whatismyip.Run()
-	}
-
-	if setting.App.TLSAddress != "" {
-		runTLSServer()
-	}
-
-	runHandler()
 }
 
-func runHandler() {
+func setupEngine() *gin.Engine {
-	signalChan := make(chan os.Signal, 3)
-	signal.Notify(signalChan, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
-	ctx := context.Background()
-	var s os.Signal
-
-	for {
-		s = <-signalChan
-
-		if s == syscall.SIGHUP {
-			models.CloseDBs()
-			models.Setup(setting.App.GeodbPath.City, setting.App.GeodbPath.ASN)
-			router.SetupTemplate(engine)
-
-			if setting.App.BindAddress != "" {
-				if err := tcpServer.Shutdown(ctx); err != nil {
-					log.Printf("TCP server forced to shutdown: %s", err)
-				}
-				runTCPServer()
-			}
-			if setting.App.TLSAddress != "" {
-				if err := tlsServer.Shutdown(ctx); err != nil {
-					log.Printf("TLS server forced to shutdown: %s", err)
-				}
-				runTLSServer()
-			}
-		} else {
-			log.Printf("Shutting down...")
-			if setting.App.BindAddress != "" {
-				if err := tcpServer.Shutdown(ctx); err != nil {
-					log.Printf("TCP server forced to shutdown: %s", err)
-				}
-			}
-			if setting.App.TLSAddress != "" {
-				if err := tlsServer.Shutdown(ctx); err != nil {
-					log.Printf("TLS server forced to shutdown: %s", err)
-				}
-			}
-			models.CloseDBs()
-			break
-		}
-	}
-}
-
-func runTCPServer() {
-	tcpServer = &http.Server{
-		Addr:         setting.App.BindAddress,
-		Handler:      engine,
-		ReadTimeout:  setting.App.Server.ReadTimeout,
-		WriteTimeout: setting.App.Server.WriteTimeout,
-	}
-
-	go func() {
-		log.Printf("Starting TCP server listening on %s", setting.App.BindAddress)
-		if err := tcpServer.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
-			log.Fatal(err)
-		}
-		log.Printf("Stopping TCP server...")
-	}()
-}
-
-func runTLSServer() {
-	tlsServer = &http.Server{
-		Addr:         setting.App.TLSAddress,
-		Handler:      engine,
-		ReadTimeout:  setting.App.Server.ReadTimeout,
-		WriteTimeout: setting.App.Server.WriteTimeout,
-	}
-
-	go func() {
-		log.Printf("Starting TLS server listening on %s", setting.App.TLSAddress)
-		if err := tlsServer.ListenAndServeTLS(setting.App.TLSCrtPath, setting.App.TLSKeyPath); err != nil &&
-			!errors.Is(err, http.ErrServerClosed) {
-			log.Fatal(err)
-		}
-		log.Printf("Stopping TLS server...")
-	}()
-}
-
-func setupEngine() {
 	gin.DisableConsoleColor()
 	if os.Getenv(gin.EnvGinMode) == "" {
 		gin.SetMode(gin.ReleaseMode)
 	}
-	engine = gin.New()
+	engine := gin.New()
 	engine.Use(gin.LoggerWithFormatter(httputils.GetLogFormatter))
 	engine.Use(gin.Recovery())
 	if setting.App.EnableSecureHeaders {
-		engine.Use(addSecureHeaders())
+		engine.Use(secure.New(secure.Config{
-	}
-	_ = engine.SetTrustedProxies(nil)
-	engine.TrustedPlatform = setting.App.TrustedHeader
-}
-
-func addSecureHeaders() gin.HandlerFunc {
-	return func(c *gin.Context) {
-		err := secure.New(secure.Options{
 			BrowserXssFilter:   true,
 			ContentTypeNosniff: true,
 			FrameDeny:          true,
-		}).Process(c.Writer, c.Request)
+		}))
-		if err != nil {
-			c.Abort()
-			return
-		}
-
-		// Avoid header rewrite if response is a redirection.
-		if status := c.Writer.Status(); status > 300 && status < 399 {
-			c.Abort()
-		}
 	}
+	_ = engine.SetTrustedProxies(nil)
+	engine.TrustedPlatform = setting.App.TrustedHeader
+
+	return engine
 }

go.mod

@@ -1,60 +1,90 @@
 module github.com/dcarrillo/whatismyip
 
-go 1.18
+go 1.21.3
 
 require (
-	github.com/gin-gonic/gin v1.7.7
+	github.com/gin-contrib/secure v0.0.1
-	github.com/oschwald/maxminddb-golang v1.9.0
+	github.com/gin-gonic/gin v1.9.1
-	github.com/stretchr/testify v1.7.1
+	github.com/oschwald/maxminddb-golang v1.12.0
-	github.com/testcontainers/testcontainers-go v0.12.0
+	github.com/quic-go/quic-go v0.40.1
-	github.com/unrolled/secure v1.10.0
+	github.com/stretchr/testify v1.8.4
+	github.com/testcontainers/testcontainers-go v0.27.0
+	golang.org/x/net v0.19.0
 )
 
 require (
+	dario.cat/mergo v1.0.0 // indirect
 	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
-	github.com/Microsoft/go-winio v0.5.2 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
-	github.com/Microsoft/hcsshim v0.9.2 // indirect
+	github.com/Microsoft/hcsshim v0.11.4 // indirect
-	github.com/cenkalti/backoff v2.2.1+incompatible // indirect
+	github.com/bytedance/sonic v1.10.2 // indirect
-	github.com/containerd/cgroups v1.0.3 // indirect
+	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
-	github.com/containerd/containerd v1.6.2 // indirect
+	github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d // indirect
+	github.com/chenzhuoyu/iasm v0.9.1 // indirect
+	github.com/containerd/containerd v1.7.11 // indirect
+	github.com/containerd/log v0.1.0 // indirect
+	github.com/cpuguy83/dockercfg v0.3.1 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/docker/distribution v2.8.1+incompatible // indirect
+	github.com/docker/distribution v2.8.2+incompatible // indirect
-	github.com/docker/docker v20.10.14+incompatible // indirect
+	github.com/docker/docker v24.0.7+incompatible // indirect
 	github.com/docker/go-connections v0.4.0 // indirect
-	github.com/docker/go-units v0.4.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
 	github.com/gin-contrib/sse v0.1.0 // indirect
-	github.com/go-playground/locales v0.14.0 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
-	github.com/go-playground/universal-translator v0.18.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
-	github.com/go-playground/validator/v10 v10.10.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.16.0 // indirect
+	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
-	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/pprof v0.0.0-20231229205709-960ae82b1e42 // indirect
-	github.com/google/uuid v1.3.0 // indirect
+	github.com/google/uuid v1.4.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/leodido/go-urn v1.2.1 // indirect
+	github.com/klauspost/compress v1.16.5 // indirect
-	github.com/magiconair/properties v1.8.6 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.6 // indirect
-	github.com/mattn/go-isatty v0.0.14 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
-	github.com/moby/sys/mount v0.3.1 // indirect
+	github.com/leodido/go-urn v1.2.4 // indirect
-	github.com/moby/sys/mountinfo v0.6.0 // indirect
+	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
-	github.com/moby/term v0.0.0-20210619224110-3f7ff695adc6 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/moby/patternmatcher v0.6.0 // indirect
+	github.com/moby/sys/sequential v0.5.0 // indirect
+	github.com/moby/term v0.5.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/morikuni/aec v1.0.0 // indirect
+	github.com/onsi/ginkgo/v2 v2.13.2 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
-	github.com/opencontainers/image-spec v1.0.2 // indirect
+	github.com/opencontainers/image-spec v1.1.0-rc5 // indirect
-	github.com/opencontainers/runc v1.1.1 // indirect
+	github.com/opencontainers/runc v1.1.9 // indirect
+	github.com/pelletier/go-toml/v2 v2.1.1 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/sirupsen/logrus v1.8.1 // indirect
+	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
-	github.com/ugorji/go/codec v1.2.7 // indirect
+	github.com/quic-go/qpack v0.4.0 // indirect
-	go.opencensus.io v0.23.0 // indirect
+	github.com/quic-go/qtls-go1-20 v0.4.1 // indirect
-	golang.org/x/crypto v0.0.0-20220331220935-ae2d96664a29 // indirect
+	github.com/rogpeppe/go-internal v1.10.0 // indirect
-	golang.org/x/net v0.0.0-20220401154927-543a649e0bdd // indirect
+	github.com/shirou/gopsutil/v3 v3.23.11 // indirect
-	golang.org/x/sys v0.0.0-20220330033206-e17cdc41300f // indirect
+	github.com/shoenig/go-m1cpu v0.1.6 // indirect
-	golang.org/x/text v0.3.7 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
-	google.golang.org/genproto v0.0.0-20220401170504-314d38edb7de // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
-	google.golang.org/grpc v1.45.0 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
-	google.golang.org/protobuf v1.28.0 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+	github.com/yusufpapurcu/wmi v1.2.3 // indirect
+	go.uber.org/mock v0.4.0 // indirect
+	golang.org/x/arch v0.6.0 // indirect
+	golang.org/x/crypto v0.17.0 // indirect
+	golang.org/x/exp v0.0.0-20231226003508-02704c960a9b // indirect
+	golang.org/x/mod v0.14.0 // indirect
+	golang.org/x/sys v0.15.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/tools v0.16.1 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d // indirect
+	google.golang.org/grpc v1.59.0 // indirect
+	google.golang.org/protobuf v1.32.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	gotest.tools/v3 v3.5.1 // indirect
 )

integration-tests/integration_test.go

@@ -4,14 +4,17 @@ import (
 	"context"
 	"crypto/tls"
 	"encoding/json"
-	"io/ioutil"
+	"fmt"
-	"log"
+	"io"
 	"net/http"
 	"path/filepath"
 	"runtime"
+	"strings"
 	"testing"
 
 	"github.com/dcarrillo/whatismyip/router"
+	"github.com/quic-go/quic-go"
+	"github.com/quic-go/quic-go/http3"
 	"github.com/stretchr/testify/assert"
 	"github.com/testcontainers/testcontainers-go"
 	"github.com/testcontainers/testcontainers-go/wait"
@@ -27,59 +30,178 @@ func buildContainer() testcontainers.ContainerRequest {
 			Dockerfile: "Dockerfile",
 		},
 		Cmd: []string{
-			"-geoip2-city", "/tmp/GeoIP2-City-Test.mmdb",
+			"-geoip2-city", "/GeoIP2-City-Test.mmdb",
-			"-geoip2-asn", "/tmp/GeoLite2-ASN-Test.mmdb",
+			"-geoip2-asn", "/GeoLite2-ASN-Test.mmdb",
 			"-bind", ":8000",
 			"-tls-bind", ":8001",
-			"-tls-crt", "/tmp/server.pem",
+			"-tls-crt", "/server.pem",
-			"-tls-key", "/tmp/server.key",
+			"-tls-key", "/server.key",
 			"-trusted-header", "X-Real-IP",
 			"-enable-secure-headers",
+			"-enable-http3",
 		},
-		ExposedPorts: []string{"8000:8000", "8001:8001"},
+		ExposedPorts: []string{"8000:8000", "8001:8001", "8001:8001/udp"},
-		WaitingFor:   wait.ForLog("Starting TLS server listening on :8001"),
+		WaitingFor: wait.ForHTTP("/geo").
-		BindMounts: map[string]string{
+			WithTLS(true, &tls.Config{InsecureSkipVerify: true}).
-			"/tmp/GeoIP2-City-Test.mmdb":  filepath.Join(dir, "/../test/GeoIP2-City-Test.mmdb"),
+			WithPort("8001"),
-			"/tmp/GeoLite2-ASN-Test.mmdb": filepath.Join(dir, "/../test/GeoLite2-ASN-Test.mmdb"),
+		Files: []testcontainers.ContainerFile{
-			"/tmp/server.pem":             filepath.Join(dir, "/../test/server.pem"),
+			{
-			"/tmp/server.key":             filepath.Join(dir, "/../test/server.key"),
+				HostFilePath:      filepath.Join(dir, "/../test/GeoIP2-City-Test.mmdb"),
+				ContainerFilePath: "/GeoIP2-City-Test.mmdb",
+				FileMode:          0644,
+			},
+			{
+				HostFilePath:      filepath.Join(dir, "/../test/GeoLite2-ASN-Test.mmdb"),
+				ContainerFilePath: "/GeoLite2-ASN-Test.mmdb",
+				FileMode:          0644,
+			},
+			{
+				HostFilePath:      filepath.Join(dir, "/../test/server.pem"),
+				ContainerFilePath: "/server.pem",
+				FileMode:          0644,
+			},
+			{
+				HostFilePath:      filepath.Join(dir, "/../test/server.key"),
+				ContainerFilePath: "/server.key",
+				FileMode:          0644,
+			},
 		},
 	}
 
 	return req
 }
 
+func initContainer(t assert.TestingT, request testcontainers.ContainerRequest) func() {
+	ctx := context.Background()
+
+	container, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
+		ContainerRequest: request,
+		Started:          true,
+	})
+	assert.NoError(t, err)
+
+	return func() {
+		assert.NoError(t, container.Terminate(ctx))
+	}
+}
+
 func TestContainerIntegration(t *testing.T) {
 	if testing.Short() {
 		t.Skip("Skiping integration tests")
 	}
 
-	ctx := context.Background()
+	t.Cleanup(initContainer(t, buildContainer()))
-	container, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
-		ContainerRequest: buildContainer(),
-		Started:          true,
-	})
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer func() {
-		err := container.Terminate(ctx)
-		if err != nil {
-			log.Fatal(err)
-		}
-	}()
 
 	http.DefaultTransport.(*http.Transport).TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
-	for _, url := range []string{"http://localhost:8000/json", "https://localhost:8001/json"} {
+	tests := []struct {
-		resp, _ := http.Get(url)
+		name string
-		assert.Equal(t, 200, resp.StatusCode)
+		url  string
+		quic bool
+	}{
+		{
+			name: "RequestOverHTTP",
+			url:  "http://localhost:8000",
+			quic: false,
+		},
+		{
+			name: "RequestOverHTTPs",
+			url:  "https://localhost:8001",
+			quic: false,
+		},
+		{
+			name: "RequestOverUDPWithQuic",
+			url:  "https://localhost:8001",
+			quic: true,
+		},
+	}
 
-		var dat router.JSONResponse
+	testsPortScan := []struct {
-		body, err := ioutil.ReadAll(resp.Body)
+		name string
-		if err != nil {
+		port int
-			log.Fatal(err)
+		want bool
-		}
+	}{
+		{
+			name: "RequestOpenPortScan",
+			port: 8000,
+			want: true,
+		},
+		{
+			name: "RequestClosedPortScan",
+			port: 65533,
+			want: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req, err := http.NewRequest("GET", tt.url, nil)
+			assert.NoError(t, err)
+			req.Header.Set("Accept", "application/json")
+
+			var resp *http.Response
+			var body []byte
+			if tt.quic {
+				resp, body, err = doQuicRequest(req)
+			} else {
+				client := &http.Client{}
+				resp, _ = client.Do(req)
+				body, err = io.ReadAll(resp.Body)
+				if strings.Contains(tt.url, "https://") {
+					assert.Equal(t, `h3=":8001"; ma=2592000`, resp.Header.Get("Alt-Svc"))
+				}
+			}
+			assert.NoError(t, err)
+			assert.Equal(t, 200, resp.StatusCode)
+
+			assert.NoError(t, json.Unmarshal(body, &router.JSONResponse{}))
+			assert.Equal(t, "DENY", resp.Header.Get("X-Frame-Options"))
+			assert.Equal(t, "nosniff", resp.Header.Get("X-Content-Type-Options"))
+			assert.Equal(t, "1; mode=block", resp.Header.Get("X-Xss-Protection"))
+		})
+	}
+
+	for _, tt := range testsPortScan {
+		t.Run(tt.name, func(t *testing.T) {
+			req, err := http.NewRequest("GET", fmt.Sprintf("http://localhost:8000/scan/tcp/%d", tt.port), nil)
+			assert.NoError(t, err)
+			req.Header.Set("Accept", "application/json")
+			req.Header.Set("X-Real-IP", "127.0.0.1")
+
+			client := &http.Client{}
+			resp, err := client.Do(req)
+			assert.NoError(t, err)
+			assert.Equal(t, 200, resp.StatusCode)
+
+			body, err := io.ReadAll(resp.Body)
+			assert.NoError(t, err)
+			j := router.JSONScanResponse{}
+			assert.NoError(t, json.Unmarshal(body, &j))
+			assert.Equal(t, tt.want, j.Reachable)
+		})
 
-		assert.NoError(t, json.Unmarshal(body, &dat))
 	}
 }
+
+func doQuicRequest(req *http.Request) (*http.Response, []byte, error) {
+	roundTripper := &http3.RoundTripper{
+		TLSClientConfig: &tls.Config{
+			InsecureSkipVerify: true,
+		},
+		QuicConfig: &quic.Config{},
+	}
+	defer roundTripper.Close()
+
+	client := &http.Client{
+		Transport: roundTripper,
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	defer resp.Body.Close()
+	body, _ := io.ReadAll(resp.Body)
+
+	return resp, body, nil
+}

internal/httputils/http.go

@@ -3,9 +3,11 @@ package httputils
 import (
 	"fmt"
 	"net/http"
+	"net/textproto"
 	"sort"
 	"strings"
 
+	"github.com/dcarrillo/whatismyip/internal/setting"
 	"github.com/gin-gonic/gin"
 )
 
@@ -32,6 +34,17 @@ func HeadersToSortedString(headers http.Header) string {
 	return output
 }
 
+// GetHeadersWithoutTrustedHeaders return a http.Heade object with the original headers except trusted headers
+func GetHeadersWithoutTrustedHeaders(ctx *gin.Context) http.Header {
+	h := ctx.Request.Header
+
+	for _, k := range []string{setting.App.TrustedHeader, setting.App.TrustedPortHeader} {
+		delete(h, textproto.CanonicalMIMEHeaderKey(k))
+	}
+
+	return h
+}
+
 // GetLogFormatter returns our custom log format
 func GetLogFormatter(param gin.LogFormatterParams) string {
 	return fmt.Sprintf("%s - [%s] \"%s %s %s\" %d %d %d %s \"%s\" \"%s\" \"%s\"\n",

internal/setting/app.go

@@ -27,7 +27,9 @@ type settings struct {
 	TLSCrtPath          string
 	TLSKeyPath          string
 	TrustedHeader       string
+	TrustedPortHeader   string
 	EnableSecureHeaders bool
+	EnableHTTP3         bool
 	Server              serverSettings
 	version             bool
 }
@@ -69,10 +71,17 @@ func Setup(args []string) (output string, err error) {
 	)
 	flags.StringVar(&App.TLSCrtPath, "tls-crt", "", "When using TLS, path to certificate file")
 	flags.StringVar(&App.TLSKeyPath, "tls-key", "", "When using TLS, path to private key file")
-	flags.StringVar(&App.TrustedHeader,
+	flags.StringVar(
+		&App.TrustedHeader,
 		"trusted-header",
 		"",
-		"Trusted request header for remote IP (e.g. X-Real-IP)",
+		"Trusted request header for remote IP (e.g. X-Real-IP). When using this feature if -trusted-port-header is not set the client port is shown as 'unknown'",
+	)
+	flags.StringVar(
+		&App.TrustedPortHeader,
+		"trusted-port-header",
+		"",
+		"Trusted request header for remote client port (e.g. X-Real-Port). When this parameter is set -trusted-header becomes mandatory",
 	)
 	flags.BoolVar(&App.version, "version", false, "Output version information and exit")
 	flags.BoolVar(
@@ -81,6 +90,12 @@ func Setup(args []string) (output string, err error) {
 		false,
 		"Add sane security-related headers to every response",
 	)
+	flags.BoolVar(
+		&App.EnableHTTP3,
+		"enable-http3",
+		false,
+		"Enable HTTP/3 protocol. HTTP/3 requires --tls-bind set, as HTTP/3 starts as a TLS connection that then gets upgraded to UDP. The UDP port is the same as the one used for the TLS server.",
+	)
 
 	err = flags.Parse(args)
 	if err != nil {
@@ -91,12 +106,20 @@ func Setup(args []string) (output string, err error) {
 		return fmt.Sprintf("whatismyip version %s", core.Version), ErrVersion
 	}
 
+	if App.TrustedPortHeader != "" && App.TrustedHeader == "" {
+		return "", fmt.Errorf("truster-header is mandatory when truster-port-header is set")
+	}
+
 	if App.GeodbPath.City == "" || App.GeodbPath.ASN == "" {
 		return "", fmt.Errorf("geoip2-city and geoip2-asn parameters are mandatory")
 	}
 
 	if (App.TLSAddress != "") && (App.TLSCrtPath == "" || App.TLSKeyPath == "") {
-		return "", fmt.Errorf("In order to use TLS -tls-crt and -tls-key flags are mandatory")
+		return "", fmt.Errorf("in order to use TLS, the -tls-crt and -tls-key flags are mandatory")
+	}
+
+	if App.EnableHTTP3 && App.TLSAddress == "" {
+		return "", fmt.Errorf("in order to use HTTP3, the -tls-bind is mandatory")
 	}
 
 	if App.TemplatePath != "" {

internal/setting/app_test.go

@@ -8,51 +8,56 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestParseMandatoryFlags(t *testing.T) {
 	var mandatoryFlags = []struct {
 		args []string
-		conf settings
 	}{
 		{
 			[]string{},
-			settings{},
 		},
 		{
 			[]string{"-geoip2-city", "/city-path"},
-			settings{},
 		},
 		{
 			[]string{"-geoip2-asn", "/asn-path"},
-			settings{},
 		},
 		{
 			[]string{
 				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path", "-tls-bind", ":9000",
 			},
-			settings{},
 		},
 		{
 			[]string{
 				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path", "-tls-bind", ":9000",
 				"-tls-crt", "/crt-path",
 			},
-			settings{},
 		},
 		{
 			[]string{
 				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path", "-tls-bind", ":9000",
 				"-tls-key", "/key-path",
 			},
-			settings{},
+		},
+		{
+			[]string{
+				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path", "-enable-http3",
+			},
+		},
+		{
+			[]string{
+				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path", "-bind", ":8000",
+				"-trusted-port-header", "port-header",
+			},
 		},
 	}
 
 	for _, tt := range mandatoryFlags {
 		t.Run(strings.Join(tt.args, " "), func(t *testing.T) {
 			_, err := Setup(tt.args)
-			assert.NotNil(t, err)
+			require.NotNil(t, err)
 			assert.Contains(t, err.Error(), "mandatory")
 		})
 	}
@@ -70,13 +75,7 @@ func TestParseFlags(t *testing.T) {
 					City: "/city-path",
 					ASN:  "/asn-path",
 				},
-				TemplatePath:        "",
+				BindAddress: ":8080",
-				BindAddress:         ":8080",
-				TLSAddress:          "",
-				TLSCrtPath:          "",
-				TLSKeyPath:          "",
-				TrustedHeader:       "",
-				EnableSecureHeaders: false,
 				Server: serverSettings{
 					ReadTimeout:  10 * time.Second,
 					WriteTimeout: 10 * time.Second,
@@ -90,13 +89,7 @@ func TestParseFlags(t *testing.T) {
 					City: "/city-path",
 					ASN:  "/asn-path",
 				},
-				TemplatePath:        "",
+				BindAddress: ":8001",
-				BindAddress:         ":8001",
-				TLSAddress:          "",
-				TLSCrtPath:          "",
-				TLSKeyPath:          "",
-				TrustedHeader:       "",
-				EnableSecureHeaders: false,
 				Server: serverSettings{
 					ReadTimeout:  10 * time.Second,
 					WriteTimeout: 10 * time.Second,
@@ -113,13 +106,29 @@ func TestParseFlags(t *testing.T) {
 					City: "/city-path",
 					ASN:  "/asn-path",
 				},
-				TemplatePath:        "",
+				BindAddress: ":8080",
-				BindAddress:         ":8080",
+				TLSAddress:  ":9000",
-				TLSAddress:          ":9000",
+				TLSCrtPath:  "/crt-path",
-				TLSCrtPath:          "/crt-path",
+				TLSKeyPath:  "/key-path",
-				TLSKeyPath:          "/key-path",
+				Server: serverSettings{
-				TrustedHeader:       "",
+					ReadTimeout:  10 * time.Second,
-				EnableSecureHeaders: false,
+					WriteTimeout: 10 * time.Second,
+				},
+			},
+		},
+		{
+			[]string{
+				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path",
+				"-trusted-header", "header", "-trusted-port-header", "port-header",
+			},
+			settings{
+				GeodbPath: geodbPath{
+					City: "/city-path",
+					ASN:  "/asn-path",
+				},
+				BindAddress:       ":8080",
+				TrustedHeader:     "header",
+				TrustedPortHeader: "port-header",
 				Server: serverSettings{
 					ReadTimeout:  10 * time.Second,
 					WriteTimeout: 10 * time.Second,
@@ -136,11 +145,7 @@ func TestParseFlags(t *testing.T) {
 					City: "/city-path",
 					ASN:  "/asn-path",
 				},
-				TemplatePath:        "",
 				BindAddress:         ":8080",
-				TLSAddress:          "",
-				TLSCrtPath:          "",
-				TLSKeyPath:          "",
 				TrustedHeader:       "header",
 				EnableSecureHeaders: true,
 				Server: serverSettings{
@@ -154,7 +159,7 @@ func TestParseFlags(t *testing.T) {
 	for _, tt := range flags {
 		t.Run(strings.Join(tt.args, " "), func(t *testing.T) {
 			_, err := Setup(tt.args)
-			assert.Nil(t, err)
+			require.Nil(t, err)
 			assert.True(t, reflect.DeepEqual(App, tt.conf))
 		})
 	}
@@ -192,6 +197,6 @@ func TestParseFlagTemplate(t *testing.T) {
 		"-template", "/",
 	}
 	_, err = Setup(flags)
-	assert.Error(t, err)
+	require.Error(t, err)
 	assert.Contains(t, err.Error(), "must be a file")
 }

models/geo.go

@@ -68,18 +68,10 @@ func CloseDBs() {
 
 // LookUp an IP and get city data
 func (record *GeoRecord) LookUp(ip net.IP) error {
-	if err := db.city.Lookup(ip, record); err != nil {
+	return db.city.Lookup(ip, record)
-		return err
-	}
-
-	return nil
 }
 
 // LookUp an IP and get ASN data
 func (record *ASNRecord) LookUp(ip net.IP) error {
-	if err := db.asn.Lookup(ip, record); err != nil {
+	return db.asn.Lookup(ip, record)
-		return err
-	}
-
-	return nil
 }

router/generic.go

@@ -4,7 +4,6 @@ import (
 	"net"
 	"net/http"
 	"path/filepath"
-	"regexp"
 
 	"github.com/dcarrillo/whatismyip/internal/httputils"
 	"github.com/dcarrillo/whatismyip/internal/setting"
@@ -12,8 +11,6 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
-const userAgentPattern = `curl|wget|libwww-perl|python|ansible-httpget|HTTPie|WindowsPowerShell|http_request|Go-http-client|^$`
-
 // JSONResponse maps data as json
 type JSONResponse struct {
 	IP              string      `json:"ip"`
@@ -33,27 +30,45 @@ type JSONResponse struct {
 }
 
 func getRoot(ctx *gin.Context) {
-	reg := regexp.MustCompile(userAgentPattern)
+	switch ctx.NegotiateFormat(gin.MIMEPlain, gin.MIMEHTML, gin.MIMEJSON) {
-	if reg.Match([]byte(ctx.Request.UserAgent())) {
+	case gin.MIMEHTML:
-		ctx.String(http.StatusOK, ctx.ClientIP())
-	} else {
 		name := "home"
 		if setting.App.TemplatePath != "" {
 			name = filepath.Base(setting.App.TemplatePath)
 		}
 		ctx.HTML(http.StatusOK, name, jsonOutput(ctx))
+	case gin.MIMEJSON:
+		getJSON(ctx)
+	default:
+		ctx.String(http.StatusOK, ctx.ClientIP()+"\n")
 	}
 }
 
+func getClientPort(ctx *gin.Context) string {
+	var port string
+	if setting.App.TrustedPortHeader == "" {
+		if setting.App.TrustedHeader != "" {
+			port = "unknown"
+		} else {
+			_, port, _ = net.SplitHostPort(ctx.Request.RemoteAddr)
+		}
+	} else {
+		port = ctx.GetHeader(setting.App.TrustedPortHeader)
+		if port == "" {
+			port = "unknown"
+		}
+	}
+
+	return port
+}
+
 func getClientPortAsString(ctx *gin.Context) {
-	_, port, _ := net.SplitHostPort(ctx.Request.RemoteAddr)
+	ctx.String(http.StatusOK, getClientPort(ctx)+"\n")
-	ctx.String(http.StatusOK, port+"\n")
 }
 
 func getAllAsString(ctx *gin.Context) {
 	output := "IP: " + ctx.ClientIP() + "\n"
-	_, port, _ := net.SplitHostPort(ctx.Request.RemoteAddr)
+	output += "Client Port: " + getClientPort(ctx) + "\n"
-	output += "Client Port: " + port + "\n"
 
 	r := service.Geo{IP: net.ParseIP(ctx.ClientIP())}
 	if record := r.LookUpCity(); record != nil {
@@ -64,8 +79,8 @@ func getAllAsString(ctx *gin.Context) {
 		output += geoASNRecordToString(record) + "\n"
 	}
 
-	h := ctx.Request.Header
+	h := httputils.GetHeadersWithoutTrustedHeaders(ctx)
-	h["Host"] = []string{ctx.Request.Host}
+	h.Set("Host", ctx.Request.Host)
 	output += httputils.HeadersToSortedString(h)
 
 	ctx.String(http.StatusOK, output)
@@ -84,11 +99,10 @@ func jsonOutput(ctx *gin.Context) JSONResponse {
 		version = 6
 	}
 
-	_, port, _ := net.SplitHostPort(ctx.Request.RemoteAddr)
 	return JSONResponse{
 		IP:              ctx.ClientIP(),
 		IPVersion:       version,
-		ClientPort:      port,
+		ClientPort:      getClientPort(ctx),
 		Country:         cityRecord.Country.Names["en"],
 		CountryCode:     cityRecord.Country.ISOCode,
 		City:            cityRecord.City.Names["en"],
@@ -99,6 +113,6 @@ func jsonOutput(ctx *gin.Context) JSONResponse {
 		ASN:             asnRecord.AutonomousSystemNumber,
 		ASNOrganization: asnRecord.AutonomousSystemOrganization,
 		Host:            ctx.Request.Host,
-		Headers:         ctx.Request.Header,
+		Headers:         httputils.GetHeadersWithoutTrustedHeaders(ctx),
 	}
 }

router/generic_test.go

@@ -6,34 +6,84 @@ import (
 	"net/http/httptest"
 	"testing"
 
+	"github.com/dcarrillo/whatismyip/internal/setting"
 	"github.com/stretchr/testify/assert"
 )
 
-func TestIP4RootFromCli(t *testing.T) {
+func TestRootContentType(t *testing.T) {
-	uas := []string{
+	tests := []struct {
-		"",
+		name     string
-		"curl",
+		accepted string
-		"wget",
+		expected string
-		"libwww-perl",
+	}{
-		"python",
+		{
-		"ansible-httpget",
+			name:     "Accept wildcard",
-		"HTTPie",
+			accepted: "*/*",
-		"WindowsPowerShell",
+			expected: contentType.text,
-		"http_request",
+		},
-		"Go-http-client",
+		{
+			name:     "Bogus accept",
+			accepted: "bogus/plain",
+			expected: contentType.text,
+		},
+		{
+			name:     "Accept plain text",
+			accepted: "text/plain",
+			expected: contentType.text,
+		},
+		{
+			name:     "Accept json",
+			accepted: "application/json",
+			expected: contentType.json,
+		},
 	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req, _ := http.NewRequest("GET", "/", nil)
+			req.Header.Set(trustedHeader, testIP.ipv4)
+			req.Header.Set("Accept", tt.accepted)
 
-	req, _ := http.NewRequest("GET", "/", nil)
+			w := httptest.NewRecorder()
-	req.Header.Set("X-Real-IP", testIP.ipv4)
+			app.ServeHTTP(w, req)
 
-	for _, ua := range uas {
+			assert.Equal(t, 200, w.Code)
-		req.Header.Set("User-Agent", ua)
+			assert.Equal(t, tt.expected, w.Header().Get("Content-Type"))
+		})
+	}
+}
 
-		w := httptest.NewRecorder()
+func TestGetIP(t *testing.T) {
-		app.ServeHTTP(w, req)
+	expected := testIP.ipv4 + "\n"
+	tests := []struct {
+		name     string
+		accepted string
+	}{
+		{
+			name:     "No browser",
+			accepted: "*/*",
+		},
+		{
+			name:     "Bogus accept",
+			accepted: "bogus/plain",
+		},
+		{
+			name:     "Plain accept",
+			accepted: "text/plain",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req, _ := http.NewRequest("GET", "/", nil)
+			req.Header.Set(trustedHeader, testIP.ipv4)
+			req.Header.Set("Accept", tt.accepted)
 
-		assert.Equal(t, 200, w.Code)
+			w := httptest.NewRecorder()
-		assert.Equal(t, testIP.ipv4, w.Body.String())
+			app.ServeHTTP(w, req)
+
+			assert.Equal(t, 200, w.Code)
+			assert.Equal(t, expected, w.Body.String())
+			assert.Equal(t, contentType.text, w.Header().Get("Content-Type"))
+		})
 	}
 }
 
@@ -48,16 +98,76 @@ func TestHost(t *testing.T) {
 }
 
 func TestClientPort(t *testing.T) {
-	req, _ := http.NewRequest("GET", "/client-port", nil)
+	type args struct {
-	req.RemoteAddr = net.JoinHostPort(testIP.ipv4, "1000")
+		params  []string
-	req.Header.Set("X-Real-IP", testIP.ipv4)
+		headers map[string][]string
+	}
+	tests := []struct {
+		name     string
+		args     args
+		expected string
+	}{
+		{
+			name:     "No trusted headers set",
+			expected: "1000\n",
+		},
+		{
+			name: "Trusted header only set",
+			args: args{
+				params: []string{
+					"-geoip2-city", "city",
+					"-geoip2-asn", "asn",
+					"-trusted-header", trustedHeader,
+				},
+			},
+			expected: "unknown\n",
+		},
+		{
+			name: "Trusted and port header set but not included in headers",
+			args: args{
+				params: []string{
+					"-geoip2-city", "city",
+					"-geoip2-asn", "asn",
+					"-trusted-header", trustedHeader,
+					"-trusted-port-header", trustedPortHeader,
+				},
+			},
+			expected: "unknown\n",
+		},
+		{
+			name: "Trusted and port header set and included in headers",
+			args: args{
+				params: []string{
+					"-geoip2-city", "city",
+					"-geoip2-asn", "asn",
+					"-trusted-header", trustedHeader,
+					"-trusted-port-header", trustedPortHeader,
+				},
+				headers: map[string][]string{
+					trustedHeader:     {testIP.ipv4},
+					trustedPortHeader: {"1001"},
+				},
+			},
+			expected: "1001\n",
+		},
+	}
 
-	w := httptest.NewRecorder()
+	for _, tt := range tests {
-	app.ServeHTTP(w, req)
+		_, _ = setting.Setup(tt.args.params)
+		t.Run(tt.name, func(t *testing.T) {
+			req, _ := http.NewRequest("GET", "/client-port", nil)
+			req.RemoteAddr = net.JoinHostPort(testIP.ipv4, "1000")
+			req.Header = tt.args.headers
 
-	assert.Equal(t, 200, w.Code)
+			w := httptest.NewRecorder()
-	assert.Equal(t, contentType.text, w.Header().Get("Content-Type"))
+			app.ServeHTTP(w, req)
-	assert.Equal(t, "1000\n", w.Body.String())
+
+			assert.Equal(t, 200, w.Code)
+			assert.Equal(t, contentType.text, w.Header().Get("Content-Type"))
+			assert.Equal(t, tt.expected, w.Body.String())
+			t.Log(w.Header())
+		})
+	}
 }
 
 func TestNotFound(t *testing.T) {
@@ -71,36 +181,59 @@ func TestNotFound(t *testing.T) {
 }
 
 func TestJSON(t *testing.T) {
-	expectedIPv4 := `{"client_port":"1000","ip":"81.2.69.192","ip_version":4,"country":"United Kingdom","country_code":"GB","city":"London","latitude":51.5142,"longitude":-0.0931,"postal_code":"","time_zone":"Europe/London","asn":0,"asn_organization":"","host":"test","headers":{"X-Real-Ip":["81.2.69.192"]}}`
+	_, _ = setting.Setup(
-	expectedIPv6 := `{"asn":3352, "asn_organization":"TELEFONICA DE ESPANA", "city":"", "client_port":"1000", "country":"", "country_code":"", "headers":{"X-Real-Ip":["2a02:9000::1"]}, "host":"test", "ip":"2a02:9000::1", "ip_version":6, "latitude":0, "longitude":0, "postal_code":"", "time_zone":""}`
+		[]string{
+			"-geoip2-city", "city",
+			"-geoip2-asn", "asn",
+			"-trusted-header", trustedHeader,
+			"-trusted-port-header", trustedPortHeader,
+		},
+	)
 
-	req, _ := http.NewRequest("GET", "/json", nil)
+	type args struct {
-	req.RemoteAddr = net.JoinHostPort(testIP.ipv4, "1000")
+		ip string
-	req.Host = "test"
+	}
-	req.Header.Set("X-Real-IP", testIP.ipv4)
+	tests := []struct {
+		name     string
+		args     args
+		expected string
+	}{
+		{
+			name: "IPv4",
+			args: args{
+				ip: testIP.ipv4,
+			},
+			expected: jsonIPv4,
+		},
+		{
+			name: "IPv6",
+			args: args{
+				ip: testIP.ipv6,
+			},
+			expected: jsonIPv6,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req, _ := http.NewRequest("GET", "/json", nil)
+			req.RemoteAddr = net.JoinHostPort(tt.args.ip, "1000")
+			req.Host = "test"
+			req.Header.Set(trustedHeader, tt.args.ip)
+			req.Header.Set(trustedPortHeader, "1001")
 
-	w := httptest.NewRecorder()
+			w := httptest.NewRecorder()
-	app.ServeHTTP(w, req)
+			app.ServeHTTP(w, req)
 
-	assert.Equal(t, 200, w.Code)
+			assert.Equal(t, 200, w.Code)
-	assert.Equal(t, contentType.json, w.Header().Get("Content-Type"))
+			assert.Equal(t, contentType.json, w.Header().Get("Content-Type"))
-	assert.JSONEq(t, expectedIPv4, w.Body.String())
+			assert.JSONEq(t, tt.expected, w.Body.String())
-
+		})
-	req.RemoteAddr = net.JoinHostPort(testIP.ipv6, "1000")
+	}
-	req.Host = "test"
-	req.Header.Set("X-Real-IP", testIP.ipv6)
-
-	w = httptest.NewRecorder()
-	app.ServeHTTP(w, req)
-
-	assert.Equal(t, 200, w.Code)
-	assert.Equal(t, contentType.json, w.Header().Get("Content-Type"))
-	assert.JSONEq(t, expectedIPv6, w.Body.String())
 }
 
 func TestAll(t *testing.T) {
 	expected := `IP: 81.2.69.192
-Client Port: 1000
+Client Port: 1001
 City: London
 Country: United Kingdom
 Country Code: GB
@@ -114,13 +247,21 @@ ASN Organization:
 
 Header1: one
 Host: test
-X-Real-Ip: 81.2.69.192
 `
+	_, _ = setting.Setup(
+		[]string{
+			"-geoip2-city", "city",
+			"-geoip2-asn", "asn",
+			"-trusted-header", trustedHeader,
+			"-trusted-port-header", trustedPortHeader,
+		},
+	)
 
 	req, _ := http.NewRequest("GET", "/all", nil)
 	req.RemoteAddr = net.JoinHostPort(testIP.ipv4, "1000")
 	req.Host = "test"
-	req.Header.Set("X-Real-IP", testIP.ipv4)
+	req.Header.Set(trustedHeader, testIP.ipv4)
+	req.Header.Set(trustedPortHeader, "1001")
 	req.Header.Set("Header1", "one")
 
 	w := httptest.NewRecorder()

router/headers.go

@@ -10,15 +10,17 @@ import (
 )
 
 func getHeadersAsSortedString(ctx *gin.Context) {
-	h := ctx.Request.Header
+	h := httputils.GetHeadersWithoutTrustedHeaders(ctx)
-	h["Host"] = []string{ctx.Request.Host}
+	h.Set("Host", ctx.Request.Host)
 
 	ctx.String(http.StatusOK, httputils.HeadersToSortedString(h))
 }
 
 func getHeaderAsString(ctx *gin.Context) {
+	headers := httputils.GetHeadersWithoutTrustedHeaders(ctx)
+
 	h := ctx.Params.ByName("header")
-	if v := ctx.GetHeader(h); v != "" {
+	if v := headers.Get(ctx.Params.ByName("header")); v != "" {
 		ctx.String(http.StatusOK, template.HTMLEscapeString(v))
 	} else if strings.ToLower(h) == "host" {
 		ctx.String(http.StatusOK, template.HTMLEscapeString(ctx.Request.Host))

router/headers_test.go

@@ -5,6 +5,7 @@ import (
 	"net/http/httptest"
 	"testing"
 
+	"github.com/dcarrillo/whatismyip/internal/setting"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -26,13 +27,20 @@ Header2: value22
 Header3: value3
 Host: 
 `
-
+	_, _ = setting.Setup([]string{
+		"-geoip2-city", "city",
+		"-geoip2-asn", "asn",
+		"-trusted-header", trustedHeader,
+		"-trusted-port-header", trustedPortHeader,
+	})
 	req, _ := http.NewRequest("GET", "/headers", nil)
 	req.Header = map[string][]string{
 		"Header1": {"value1"},
 		"Header2": {"value21", "value22"},
 		"Header3": {"value3"},
 	}
+	req.Header.Set(trustedHeader, "1.1.1.1")
+	req.Header.Set(trustedPortHeader, "1025")
 
 	w := httptest.NewRecorder()
 	app.ServeHTTP(w, req)

router/port_scanner.go

@@ -0,0 +1,54 @@
+package router
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"strconv"
+
+	"github.com/dcarrillo/whatismyip/service"
+	"github.com/gin-gonic/gin"
+)
+
+type JSONScanResponse struct {
+	IP        string `json:"ip"`
+	Port      int    `json:"port"`
+	Reachable bool   `json:"reachable"`
+	Reason    string `json:"reason"`
+}
+
+func scanTCPPort(ctx *gin.Context) {
+	port, err := strconv.Atoi(ctx.Params.ByName("port"))
+	if err == nil && (port < 1 || port > 65535) {
+		err = fmt.Errorf("%d is not a valid port number", port)
+	}
+	if err != nil {
+		ctx.JSON(http.StatusBadRequest, JSONScanResponse{
+			Reason: err.Error(),
+		})
+		return
+	}
+
+	add := net.TCPAddr{
+		IP:   net.ParseIP(ctx.ClientIP()),
+		Port: port,
+	}
+
+	scan := service.PortScanner{
+		Address: &add,
+	}
+
+	isOpen, err := scan.IsPortOpen()
+	reason := ""
+	if err != nil {
+		reason = err.Error()
+	}
+
+	response := JSONScanResponse{
+		IP:        ctx.ClientIP(),
+		Port:      port,
+		Reachable: isOpen,
+		Reason:    reason,
+	}
+	ctx.JSON(http.StatusOK, response)
+}

router/setup.go

@@ -22,6 +22,7 @@ func SetupTemplate(r *gin.Engine) {
 // Setup defines the endpoints
 func Setup(r *gin.Engine) {
 	r.GET("/", getRoot)
+	r.GET("/scan/tcp/:port", scanTCPPort)
 	r.GET("/client-port", getClientPortAsString)
 	r.GET("/geo", getGeoAsString)
 	r.GET("/geo/:field", getGeoAsString)

router/setup_test.go

@@ -16,6 +16,7 @@ type testIPs struct {
 }
 
 type contentTypes struct {
+	html string
 	text string
 	json string
 }
@@ -29,12 +30,16 @@ var (
 		ipv6ASN: "2a02:a800::1",
 	}
 	contentType = contentTypes{
+		html: "content-type: text/html; charset=utf-8",
 		text: "text/plain; charset=utf-8",
 		json: "application/json; charset=utf-8",
 	}
+	jsonIPv4 = `{"client_port":"1001","ip":"81.2.69.192","ip_version":4,"country":"United Kingdom","country_code":"GB","city":"London","latitude":51.5142,"longitude":-0.0931,"postal_code":"","time_zone":"Europe/London","asn":0,"asn_organization":"","host":"test", "headers": {}}`
+	jsonIPv6 = `{"asn":3352, "asn_organization":"TELEFONICA DE ESPANA", "city":"", "client_port":"1001", "country":"", "country_code":"", "host":"test", "ip":"2a02:9000::1", "ip_version":6, "latitude":0, "longitude":0, "postal_code":"", "time_zone":"", "headers": {}}`
 )
 
 const trustedHeader = "X-Real-IP"
+const trustedPortHeader = "X-Real-Port"
 
 func TestMain(m *testing.M) {
 	app = gin.Default()

server/quic_server.go

@@ -0,0 +1,54 @@
+package server
+
+import (
+	"context"
+	"log"
+	"net/http"
+
+	"github.com/dcarrillo/whatismyip/internal/setting"
+	"github.com/quic-go/quic-go/http3"
+)
+
+type QuicServer struct {
+	server    *http3.Server
+	tlsServer *TLSServer
+	ctx       context.Context
+}
+
+func NewQuicServer(ctx context.Context, tlsServer *TLSServer) *QuicServer {
+	return &QuicServer{
+		tlsServer: tlsServer,
+		ctx:       ctx,
+	}
+}
+
+func (q *QuicServer) Start() {
+	q.server = &http3.Server{
+		Addr:    setting.App.TLSAddress,
+		Handler: q.tlsServer.server.Handler,
+	}
+
+	parentHandler := q.tlsServer.server.Handler
+	q.tlsServer.server.Handler = http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		if err := q.server.SetQuicHeaders(rw.Header()); err != nil {
+			log.Fatal(err)
+		}
+
+		parentHandler.ServeHTTP(rw, req)
+	})
+
+	log.Printf("Starting QUIC server listening on %s (udp)", setting.App.TLSAddress)
+	go func() {
+		if err := q.server.ListenAndServeTLS(setting.App.TLSCrtPath, setting.App.TLSKeyPath); err != nil &&
+			err.Error() != "quic: Server closed" {
+			log.Fatal(err)
+		}
+	}()
+}
+
+func (q *QuicServer) Stop() {
+	log.Printf("Stopping QUIC server...")
+	if err := q.server.Close(); err != nil {
+		log.Printf("QUIC server forced to shutdown")
+	}
+}

server/server.go

@@ -0,0 +1,96 @@
+package server
+
+import (
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/dcarrillo/whatismyip/internal/setting"
+	"github.com/dcarrillo/whatismyip/models"
+	"golang.org/x/net/context"
+)
+
+type Server interface {
+	Start()
+	Stop()
+}
+
+type Factory struct {
+	tcpServer  *TCPServer
+	tlsServer  *TLSServer
+	quicServer *QuicServer
+}
+
+func Setup(ctx context.Context, handler http.Handler) *Factory {
+	var tcpServer *TCPServer
+	var tlsServer *TLSServer
+	var quicServer *QuicServer
+
+	if setting.App.BindAddress != "" {
+		tcpServer = NewTCPServer(ctx, &handler)
+	}
+
+	if setting.App.TLSAddress != "" {
+		tlsServer = NewTLSServer(ctx, &handler)
+		if setting.App.EnableHTTP3 {
+			quicServer = NewQuicServer(ctx, tlsServer)
+		}
+	}
+
+	return &Factory{
+		tcpServer:  tcpServer,
+		tlsServer:  tlsServer,
+		quicServer: quicServer,
+	}
+}
+
+func (f *Factory) Run() {
+	f.start()
+
+	signalChan := make(chan os.Signal, 3)
+	signal.Notify(signalChan, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
+	var s os.Signal
+	for {
+		s = <-signalChan
+
+		if s == syscall.SIGHUP {
+			f.stop()
+			models.CloseDBs()
+			models.Setup(setting.App.GeodbPath.City, setting.App.GeodbPath.ASN)
+			f.start()
+		} else {
+			log.Printf("Shutting down...")
+			f.stop()
+			models.CloseDBs()
+			break
+		}
+	}
+}
+
+func (f *Factory) start() {
+	if f.tcpServer != nil {
+		f.tcpServer.Start()
+	}
+
+	if f.tlsServer != nil {
+		f.tlsServer.Start()
+		if f.quicServer != nil {
+			f.quicServer.Start()
+		}
+	}
+}
+
+func (f *Factory) stop() {
+	if f.tcpServer != nil {
+		f.tcpServer.Stop()
+	}
+
+	if f.tlsServer != nil {
+		if f.quicServer != nil {
+			f.quicServer.Stop()
+		}
+		f.tlsServer.Stop()
+	}
+}

server/tcp_server.go

@@ -0,0 +1,46 @@
+package server
+
+import (
+	"context"
+	"errors"
+	"log"
+	"net/http"
+
+	"github.com/dcarrillo/whatismyip/internal/setting"
+)
+
+type TCPServer struct {
+	server  *http.Server
+	handler *http.Handler
+	ctx     context.Context
+}
+
+func NewTCPServer(ctx context.Context, handler *http.Handler) *TCPServer {
+	return &TCPServer{
+		handler: handler,
+		ctx:     ctx,
+	}
+}
+
+func (t *TCPServer) Start() {
+	t.server = &http.Server{
+		Addr:         setting.App.BindAddress,
+		Handler:      *t.handler,
+		ReadTimeout:  setting.App.Server.ReadTimeout,
+		WriteTimeout: setting.App.Server.WriteTimeout,
+	}
+
+	log.Printf("Starting TCP server listening on %s", setting.App.BindAddress)
+	go func() {
+		if err := t.server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			log.Fatal(err)
+		}
+	}()
+}
+
+func (t *TCPServer) Stop() {
+	log.Printf("Stopping TCP server...")
+	if err := t.server.Shutdown(t.ctx); err != nil {
+		log.Printf("TCP server forced to shutdown: %s", err)
+	}
+}

server/tls_server.go

@@ -0,0 +1,47 @@
+package server
+
+import (
+	"context"
+	"errors"
+	"log"
+	"net/http"
+
+	"github.com/dcarrillo/whatismyip/internal/setting"
+)
+
+type TLSServer struct {
+	server  *http.Server
+	handler *http.Handler
+	ctx     context.Context
+}
+
+func NewTLSServer(ctx context.Context, handler *http.Handler) *TLSServer {
+	return &TLSServer{
+		handler: handler,
+		ctx:     ctx,
+	}
+}
+
+func (t *TLSServer) Start() {
+	t.server = &http.Server{
+		Addr:         setting.App.TLSAddress,
+		Handler:      *t.handler,
+		ReadTimeout:  setting.App.Server.ReadTimeout,
+		WriteTimeout: setting.App.Server.WriteTimeout,
+	}
+
+	log.Printf("Starting TLS server listening on %s", setting.App.TLSAddress)
+	go func() {
+		if err := t.server.ListenAndServeTLS(setting.App.TLSCrtPath, setting.App.TLSKeyPath); err != nil &&
+			!errors.Is(err, http.ErrServerClosed) {
+			log.Fatal(err)
+		}
+	}()
+}
+
+func (t *TLSServer) Stop() {
+	log.Printf("Stopping TLS server...")
+	if err := t.server.Shutdown(t.ctx); err != nil {
+		log.Printf("TLS server forced to shutdown: %s", err)
+	}
+}

service/port_scanner.go

@@ -0,0 +1,21 @@
+package service
+
+import (
+	"net"
+	"time"
+)
+
+type PortScanner struct {
+	Address net.Addr
+}
+
+func (p *PortScanner) IsPortOpen() (bool, error) {
+	conn, err := net.DialTimeout(p.Address.Network(), p.Address.String(), 3*time.Second)
+	if err != nil {
+		return false, err
+	}
+	if conn != nil {
+		defer conn.Close()
+	}
+	return true, nil
+}