[chore] Update workflows dependecies

Bumps [github.com/docker/docker](https://github.com/docker/docker) from 24.0.7+incompatible to 24.0.9+incompatible.
- [Release notes](https://github.com/docker/docker/releases)
- [Commits](https://github.com/docker/docker/compare/v24.0.7...v24.0.9)

---
updated-dependencies:
- dependency-name: github.com/docker/docker
  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

@@ -29,21 +29,18 @@ jobs:
       contents: read
       security-events: write
 
-    strategy:
-      fail-fast: false
-
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: install go
-      uses: actions/setup-go@v3
+      uses: actions/setup-go@v5
       with:
         go-version-file: go.mod
         cache: true
 
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
+      uses: github/codeql-action/init@v3
       with:
         languages: go
 
@@ -52,4 +49,4 @@ jobs:
        make build
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
+      uses: github/codeql-action/analyze@v3

.github/workflows/main.yml

@@ -15,13 +15,12 @@ jobs:
       matrix:
         make: ["lint", "test"]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: install go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
         with:
           go-version-file: go.mod
-          cache: true
 
       - name: ${{ matrix.make }}
         run: make ${{ matrix.make }}
@@ -34,11 +33,11 @@ jobs:
       matrix:
         goosarch: [linux-amd64]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: install go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
         with:
           go-version-file: go.mod
           cache: true

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.20-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

@@ -7,11 +7,11 @@ 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:
@@ -22,14 +22,9 @@ install-tools:
 	@command $(GOPATH)/shadow > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
 		go install golang.org/x/tools/go/analysis/passes/shadow/cmd/shadow@latest; \
 	fi
-
-	@command $(GOPATH)/golines > /dev/null 2>&1; if [ $$? -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

@@ -21,7 +21,8 @@
     - [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`
 
@@ -42,6 +43,7 @@ curl -6 ifconfig.es
 - 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 that can reload GeoLite2 databases and/or SSL certificates without stop/start. The `hup` signal is honored.
 - HTML templates for the landing page.
@@ -66,6 +68,7 @@ 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
 
@@ -138,7 +141,7 @@ Download the latest version from https://github.com/dcarrillo/whatismyip/release
 
 ## Docker
 
-An ultra-light (~12MB) image is available at [docker hub](https://hub.docker.com/r/dcarrillo/whatismyip).
+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

@@ -4,6 +4,7 @@ import (
 	"context"
 	"flag"
 	"fmt"
+	"net/http"
 	"os"
 
 	"github.com/dcarrillo/whatismyip/internal/httputils"
@@ -30,8 +31,9 @@ func main() {
 	engine := setupEngine()
 	router.SetupTemplate(engine)
 	router.Setup(engine)
+	servers := setupHTTPServers(context.Background(), engine.Handler())
 
-	whatismyip := server.Setup(context.Background(), engine.Handler())
+	whatismyip := server.Setup(servers)
 	whatismyip.Run()
 }
 
@@ -55,3 +57,23 @@ func setupEngine() *gin.Engine {
 
 	return engine
 }
+
+func setupHTTPServers(ctx context.Context, handler http.Handler) []server.Server {
+	var servers []server.Server
+
+	if setting.App.BindAddress != "" {
+		tcpServer := server.NewTCPServer(ctx, &handler)
+		servers = append(servers, tcpServer)
+	}
+
+	if setting.App.TLSAddress != "" {
+		tlsServer := server.NewTLSServer(ctx, &handler)
+		servers = append(servers, tlsServer)
+		if setting.App.EnableHTTP3 {
+			quicServer := server.NewQuicServer(ctx, tlsServer)
+			servers = append(servers, quicServer)
+		}
+	}
+
+	return servers
+}

go.mod

@@ -1,77 +1,90 @@
 module github.com/dcarrillo/whatismyip
 
-go 1.20
+go 1.21.3
 
 require (
 	github.com/gin-contrib/secure v0.0.1
-	github.com/gin-gonic/gin v1.9.0
-	github.com/oschwald/maxminddb-golang v1.10.0
-	github.com/quic-go/quic-go v0.34.0
-	github.com/stretchr/testify v1.8.2
-	github.com/testcontainers/testcontainers-go v0.13.0
-	golang.org/x/net v0.9.0
+	github.com/gin-gonic/gin v1.9.1
+	github.com/oschwald/maxminddb-golang v1.12.0
+	github.com/quic-go/quic-go v0.40.1
+	github.com/stretchr/testify v1.8.4
+	github.com/testcontainers/testcontainers-go v0.27.0
 )
 
 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/hcsshim v0.9.6 // indirect
-	github.com/bytedance/sonic v1.8.8 // indirect
-	github.com/cenkalti/backoff/v4 v4.1.3 // indirect
-	github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 // indirect
-	github.com/containerd/cgroups v1.0.4 // indirect
-	github.com/containerd/containerd v1.6.18 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/Microsoft/hcsshim v0.11.4 // indirect
+	github.com/bytedance/sonic v1.10.2 // indirect
+	github.com/cenkalti/backoff/v4 v4.2.1 // 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/docker v20.10.24+incompatible // indirect
+	github.com/docker/distribution v2.8.2+incompatible // indirect
+	github.com/docker/docker v24.0.9+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-ole/go-ole v1.2.6 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/go-playground/validator/v10 v10.12.0 // 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/mock v1.6.0 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
-	github.com/google/pprof v0.0.0-20230426061923-93006964c1fc // indirect
-	github.com/google/uuid v1.3.0 // indirect
+	github.com/google/pprof v0.0.0-20231229205709-960ae82b1e42 // indirect
+	github.com/google/uuid v1.4.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/cpuid/v2 v2.2.4 // indirect
-	github.com/leodido/go-urn v1.2.3 // indirect
-	github.com/magiconair/properties v1.8.6 // indirect
-	github.com/mattn/go-isatty v0.0.18 // indirect
-	github.com/moby/sys/mount v0.3.3 // indirect
-	github.com/moby/sys/mountinfo v0.6.2 // indirect
-	github.com/moby/term v0.0.0-20220808134915-39b0c02b01ae // indirect
+	github.com/klauspost/compress v1.16.5 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.6 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
+	github.com/leodido/go-urn v1.2.4 // indirect
+	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // 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 v2.9.2 // indirect
+	github.com/onsi/ginkgo/v2 v2.13.2 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
-	github.com/opencontainers/image-spec v1.0.3-0.20211202183452-c5a74bcca799 // indirect
-	github.com/opencontainers/runc v1.1.5 // indirect
-	github.com/pelletier/go-toml/v2 v2.0.7 // indirect
+	github.com/opencontainers/image-spec v1.1.0-rc5 // indirect
+	github.com/opencontainers/runc v1.1.12 // 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/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
 	github.com/quic-go/qpack v0.4.0 // indirect
-	github.com/quic-go/qtls-go1-19 v0.3.2 // indirect
-	github.com/quic-go/qtls-go1-20 v0.2.2 // indirect
-	github.com/sirupsen/logrus v1.9.0 // indirect
+	github.com/quic-go/qtls-go1-20 v0.4.1 // indirect
+	github.com/rogpeppe/go-internal v1.10.0 // indirect
+	github.com/shirou/gopsutil/v3 v3.23.11 // indirect
+	github.com/shoenig/go-m1cpu v0.1.6 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
-	github.com/ugorji/go/codec v1.2.11 // indirect
-	go.opencensus.io v0.23.0 // indirect
-	golang.org/x/arch v0.3.0 // indirect
-	golang.org/x/crypto v0.8.0 // indirect
-	golang.org/x/exp v0.0.0-20230425010034-47ecfdc1ba53 // indirect
-	golang.org/x/mod v0.10.0 // indirect
-	golang.org/x/sys v0.7.0 // indirect
-	golang.org/x/text v0.9.0 // indirect
-	golang.org/x/tools v0.8.0 // indirect
-	google.golang.org/genproto v0.0.0-20220810155839-1856144b1d9c // indirect
-	google.golang.org/grpc v1.48.0 // indirect
-	google.golang.org/protobuf v1.30.0 // indirect
+	github.com/ugorji/go/codec v1.2.12 // 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 v0.18.0 // indirect
+	golang.org/x/exp v0.0.0-20231226003508-02704c960a9b // indirect
+	golang.org/x/mod v0.14.0 // indirect
+	golang.org/x/net v0.20.0 // indirect
+	golang.org/x/sys v0.16.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/tools v0.17.0 // 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 v1.33.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
+	gotest.tools/v3 v3.5.1 // indirect
 )

integration-tests/integration_test.go

@@ -4,8 +4,8 @@ import (
 	"context"
 	"crypto/tls"
 	"encoding/json"
+	"fmt"
 	"io"
-	"log"
 	"net/http"
 	"path/filepath"
 	"runtime"
@@ -30,12 +30,12 @@ func buildContainer() testcontainers.ContainerRequest {
 			Dockerfile: "Dockerfile",
 		},
 		Cmd: []string{
-			"-geoip2-city", "/tmp/GeoIP2-City-Test.mmdb",
-			"-geoip2-asn", "/tmp/GeoLite2-ASN-Test.mmdb",
+			"-geoip2-city", "/GeoIP2-City-Test.mmdb",
+			"-geoip2-asn", "/GeoLite2-ASN-Test.mmdb",
 			"-bind", ":8000",
 			"-tls-bind", ":8001",
-			"-tls-crt", "/tmp/server.pem",
-			"-tls-key", "/tmp/server.key",
+			"-tls-crt", "/server.pem",
+			"-tls-key", "/server.key",
 			"-trusted-header", "X-Real-IP",
 			"-enable-secure-headers",
 			"-enable-http3",
@@ -44,45 +44,55 @@ func buildContainer() testcontainers.ContainerRequest {
 		WaitingFor: wait.ForHTTP("/geo").
 			WithTLS(true, &tls.Config{InsecureSkipVerify: true}).
 			WithPort("8001"),
-		Mounts: testcontainers.Mounts(
-			testcontainers.BindMount(
-				filepath.Join(dir, "/../test/GeoIP2-City-Test.mmdb"),
-				"/tmp/GeoIP2-City-Test.mmdb",
-			),
-			testcontainers.BindMount(
-				filepath.Join(dir, "/../test/GeoLite2-ASN-Test.mmdb"),
-				"/tmp/GeoLite2-ASN-Test.mmdb",
-			),
-			testcontainers.BindMount(filepath.Join(dir, "/../test/server.pem"), "/tmp/server.pem"),
-			testcontainers.BindMount(filepath.Join(dir, "/../test/server.key"), "/tmp/server.key"),
-		),
+		Files: []testcontainers.ContainerFile{
+			{
+				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()
-	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)
-		}
-	}()
+	t.Cleanup(initContainer(t, buildContainer()))
 
 	http.DefaultTransport.(*http.Transport).TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
-
 	tests := []struct {
 		name string
 		url  string
@@ -105,9 +115,27 @@ func TestContainerIntegration(t *testing.T) {
 		},
 	}
 
+	testsPortScan := []struct {
+		name string
+		port int
+		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, _ := http.NewRequest("GET", tt.url, nil)
+			req, err := http.NewRequest("GET", tt.url, nil)
+			assert.NoError(t, err)
 			req.Header.Set("Accept", "application/json")
 
 			var resp *http.Response
@@ -119,7 +147,7 @@ func TestContainerIntegration(t *testing.T) {
 				resp, _ = client.Do(req)
 				body, err = io.ReadAll(resp.Body)
 				if strings.Contains(tt.url, "https://") {
-					assert.Equal(t, `h3=":8001"; ma=2592000,h3-29=":8001"; ma=2592000`, resp.Header.Get("Alt-Svc"))
+					assert.Equal(t, `h3=":8001"; ma=2592000`, resp.Header.Get("Alt-Svc"))
 				}
 			}
 			assert.NoError(t, err)
@@ -131,6 +159,27 @@ func TestContainerIntegration(t *testing.T) {
 			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)
+		})
+
+	}
 }
 
 func doQuicRequest(req *http.Request) (*http.Response, []byte, error) {

internal/httputils/http.go

@@ -63,7 +63,7 @@ func GetLogFormatter(param gin.LogFormatterParams) string {
 	)
 }
 
-func normalizeLog(log interface{}) interface{} {
+func normalizeLog(log any) any {
 	switch v := log.(type) {
 	case string:
 		if v == "" {

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)

server/quic.go

@@ -2,6 +2,7 @@ package server
 
 import (
 	"context"
+	"errors"
 	"log"
 	"net/http"
 
@@ -9,20 +10,20 @@ import (
 	"github.com/quic-go/quic-go/http3"
 )
 
-type QuicServer struct {
+type Quic struct {
 	server    *http3.Server
-	tlsServer *TLSServer
+	tlsServer *TLS
 	ctx       context.Context
 }
 
-func NewQuicServer(ctx context.Context, tlsServer *TLSServer) *QuicServer {
-	return &QuicServer{
+func NewQuicServer(ctx context.Context, tlsServer *TLS) *Quic {
+	return &Quic{
 		tlsServer: tlsServer,
 		ctx:       ctx,
 	}
 }
 
-func (q *QuicServer) Start() {
+func (q *Quic) Start() {
 	q.server = &http3.Server{
 		Addr:    setting.App.TLSAddress,
 		Handler: q.tlsServer.server.Handler,
@@ -40,13 +41,13 @@ func (q *QuicServer) Start() {
 	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" {
+			!errors.Is(err, http.ErrServerClosed) {
 			log.Fatal(err)
 		}
 	}()
 }
 
-func (q *QuicServer) Stop() {
+func (q *Quic) Stop() {
 	log.Printf("Stopping QUIC server...")
 	if err := q.server.Close(); err != nil {
 		log.Printf("QUIC server forced to shutdown")

server/server.go

@@ -2,14 +2,12 @@ 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 {
@@ -17,80 +15,47 @@ type Server interface {
 	Stop()
 }
 
-type Factory struct {
-	tcpServer  *TCPServer
-	tlsServer  *TLSServer
-	quicServer *QuicServer
+type Manager struct {
+	servers []Server
 }
 
-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 Setup(servers []Server) *Manager {
+	return &Manager{
+		servers: servers,
 	}
 }
 
-func (f *Factory) Run() {
-	f.start()
+func (m *Manager) Run() {
+	m.start()
 
-	signalChan := make(chan os.Signal, 3)
+	signalChan := make(chan os.Signal, len(m.servers))
 	signal.Notify(signalChan, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
 	var s os.Signal
 	for {
 		s = <-signalChan
 
 		if s == syscall.SIGHUP {
-			f.stop()
+			m.stop()
 			models.CloseDBs()
 			models.Setup(setting.App.GeodbPath.City, setting.App.GeodbPath.ASN)
-			f.start()
+			m.start()
 		} else {
 			log.Printf("Shutting down...")
-			f.stop()
+			m.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 (m *Manager) start() {
+	for _, s := range m.servers {
+		s.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()
+func (m *Manager) stop() {
+	for _, s := range m.servers {
+		s.Stop()
 	}
 }

server/tcp.go

@@ -9,20 +9,20 @@ import (
 	"github.com/dcarrillo/whatismyip/internal/setting"
 )
 
-type TCPServer struct {
+type TCP struct {
 	server  *http.Server
 	handler *http.Handler
 	ctx     context.Context
 }
 
-func NewTCPServer(ctx context.Context, handler *http.Handler) *TCPServer {
-	return &TCPServer{
+func NewTCPServer(ctx context.Context, handler *http.Handler) *TCP {
+	return &TCP{
 		handler: handler,
 		ctx:     ctx,
 	}
 }
 
-func (t *TCPServer) Start() {
+func (t *TCP) Start() {
 	t.server = &http.Server{
 		Addr:         setting.App.BindAddress,
 		Handler:      *t.handler,
@@ -38,7 +38,7 @@ func (t *TCPServer) Start() {
 	}()
 }
 
-func (t *TCPServer) Stop() {
+func (t *TCP) 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.go

@@ -9,20 +9,20 @@ import (
 	"github.com/dcarrillo/whatismyip/internal/setting"
 )
 
-type TLSServer struct {
+type TLS struct {
 	server  *http.Server
 	handler *http.Handler
 	ctx     context.Context
 }
 
-func NewTLSServer(ctx context.Context, handler *http.Handler) *TLSServer {
-	return &TLSServer{
+func NewTLSServer(ctx context.Context, handler *http.Handler) *TLS {
+	return &TLS{
 		handler: handler,
 		ctx:     ctx,
 	}
 }
 
-func (t *TLSServer) Start() {
+func (t *TLS) Start() {
 	t.server = &http.Server{
 		Addr:         setting.App.TLSAddress,
 		Handler:      *t.handler,
@@ -39,7 +39,7 @@ func (t *TLSServer) Start() {
 	}()
 }
 
-func (t *TLSServer) Stop() {
+func (t *TLS) 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 +1,24 @@
+package service
+
+import (
+	"net"
+	"time"
+)
+
+const scannerTimeOut = 3 * time.Second
+
+type PortScanner struct {
+	Address net.Addr
+}
+
+func (p *PortScanner) IsPortOpen() (bool, error) {
+	conn, err := net.DialTimeout(p.Address.Network(), p.Address.String(), scannerTimeOut)
+	if err != nil {
+		return false, err
+	}
+	if conn != nil {
+		defer conn.Close()
+	}
+
+	return true, nil
+}