Bump gin-gonic to 1.8.0

Makefile

@@ -16,7 +16,7 @@ integration-test:
 .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 v1.45.2; \
 	fi
 
 	@command $(GOPATH)/shadow > /dev/null 2>&1; if [ $$? -ne 0 ]; then \

README.md

@@ -13,7 +13,7 @@
   - [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 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)
@@ -36,7 +36,7 @@ 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.
+- 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.
 - High performance.
@@ -47,7 +47,8 @@ curl -6 ifconfig.es
 ## 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
@@ -72,9 +73,11 @@ Golang >= 1.17 is required. Previous versions may work.
 ## Usage
 
 ```text
-Usage of ./whatismyip:
+Usage of whatismyip:
   -bind string
         Listening address (see https://pkg.go.dev/net?#Listen) (default ":8080")
+  -enable-secure-headers
+        Add sane security-related headers to every response
   -geoip2-asn string
         Path to GeoIP2 ASN database
   -geoip2-city string
@@ -88,7 +91,9 @@ 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
 ```
@@ -108,11 +113,11 @@ 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 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 -template mytemplate.tmpl
+             -trusted-header X-Real-IP -trusted-port-header X-Real-Port -template mytemplate.tmpl
 ```
 
 ## Download
@@ -121,7 +126,7 @@ Download latest version from https://github.com/dcarrillo/whatismyip/releases
 
 ## Docker
 
-An ultra-light (~9MB) image is available.
+An ultra-light (~10MB) image is available at [docker hub](https://hub.docker.com/r/dcarrillo/whatismyip).
 
 ### Run a container locally using test databases
 

cmd/whatismyip.go

@@ -13,6 +13,8 @@ import (
 
 	"github.com/dcarrillo/whatismyip/internal/httputils"
 	"github.com/dcarrillo/whatismyip/internal/setting"
+	"github.com/gin-contrib/secure"
+
 	"github.com/dcarrillo/whatismyip/models"
 	"github.com/dcarrillo/whatismyip/router"
 
@@ -138,6 +140,13 @@ func setupEngine() {
 	engine = gin.New()
 	engine.Use(gin.LoggerWithFormatter(httputils.GetLogFormatter))
 	engine.Use(gin.Recovery())
+	if setting.App.EnableSecureHeaders {
+		engine.Use(secure.New(secure.Config{
+			BrowserXssFilter:   true,
+			ContentTypeNosniff: true,
+			FrameDeny:          true,
+		}))
+	}
 	_ = engine.SetTrustedProxies(nil)
 	engine.TrustedPlatform = setting.App.TrustedHeader
 }

go.mod

@@ -3,57 +3,88 @@ module github.com/dcarrillo/whatismyip
 go 1.18
 
 require (
-	github.com/gin-gonic/gin v1.7.7
-	github.com/oschwald/maxminddb-golang v1.8.0
+	github.com/gin-contrib/secure v0.0.1
+	github.com/gin-gonic/gin v1.8.0
+	github.com/oschwald/maxminddb-golang v1.9.0
 	github.com/stretchr/testify v1.7.1
-	github.com/testcontainers/testcontainers-go v0.12.0
+	github.com/testcontainers/testcontainers-go v0.13.0
 )
 
 require (
 	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
 	github.com/Microsoft/go-winio v0.5.2 // indirect
-	github.com/Microsoft/hcsshim v0.9.2 // indirect
-	github.com/cenkalti/backoff v2.2.1+incompatible // indirect
-	github.com/containerd/cgroups v1.0.3 // indirect
-	github.com/containerd/containerd v1.6.1 // indirect
+	github.com/Microsoft/hcsshim v0.9.3 // indirect
+	github.com/cenkalti/backoff/v4 v4.1.3 // indirect
+	github.com/checkpoint-restore/go-criu/v5 v5.3.0 // indirect
+	github.com/cilium/ebpf v0.7.0 // indirect
+	github.com/containerd/cgroups v1.0.4 // indirect
+	github.com/containerd/console v1.0.3 // indirect
+	github.com/containerd/containerd v1.6.4 // indirect
+	github.com/containerd/continuity v0.2.2 // indirect
+	github.com/containerd/fifo v1.0.0 // indirect
+	github.com/containerd/ttrpc v1.1.0 // indirect
+	github.com/containerd/typeurl v1.0.2 // indirect
+	github.com/coreos/go-systemd/v22 v22.3.2 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.0 // indirect
+	github.com/cyphar/filepath-securejoin v0.2.3 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/docker/distribution v2.8.1+incompatible // indirect
-	github.com/docker/docker v20.10.13+incompatible // indirect
+	github.com/docker/docker v20.10.16+incompatible // indirect
 	github.com/docker/go-connections v0.4.0 // indirect
+	github.com/docker/go-events v0.0.0-20190806004212-e31b211e4f1c // indirect
 	github.com/docker/go-units v0.4.0 // indirect
 	github.com/gin-contrib/sse v0.1.0 // indirect
 	github.com/go-playground/locales v0.14.0 // indirect
 	github.com/go-playground/universal-translator v0.18.0 // indirect
-	github.com/go-playground/validator/v10 v10.10.1 // indirect
+	github.com/go-playground/validator/v10 v10.11.0 // indirect
+	github.com/goccy/go-json v0.9.7 // indirect
+	github.com/godbus/dbus/v5 v5.0.6 // indirect
+	github.com/gogo/googleapis v1.4.0 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/google/uuid v1.3.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.11.13 // indirect
 	github.com/leodido/go-urn v1.2.1 // indirect
 	github.com/magiconair/properties v1.8.6 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
-	github.com/moby/sys/mount v0.3.1 // indirect
-	github.com/moby/sys/mountinfo v0.6.0 // indirect
+	github.com/moby/locker v1.0.1 // indirect
+	github.com/moby/sys/mount v0.3.2 // indirect
+	github.com/moby/sys/mountinfo v0.6.1 // indirect
+	github.com/moby/sys/signal v0.6.0 // indirect
 	github.com/moby/term v0.0.0-20210619224110-3f7ff695adc6 // 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/mrunalp/fileutils v0.5.0 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
-	github.com/opencontainers/image-spec v1.0.2 // indirect
-	github.com/opencontainers/runc v1.1.0 // indirect
+	github.com/opencontainers/image-spec v1.0.3-0.20211202183452-c5a74bcca799 // indirect
+	github.com/opencontainers/runc v1.1.2 // indirect
+	github.com/opencontainers/runtime-spec v1.0.3-0.20210326190908-1c3f411f0417 // indirect
+	github.com/opencontainers/selinux v1.10.1 // indirect
+	github.com/pelletier/go-toml/v2 v2.0.1 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/russross/blackfriday/v2 v2.0.1 // indirect
+	github.com/seccomp/libseccomp-golang v0.9.2-0.20210429002308-3879420cc921 // indirect
+	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
 	github.com/sirupsen/logrus v1.8.1 // indirect
+	github.com/stretchr/objx v0.2.0 // indirect
+	github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635 // indirect
 	github.com/ugorji/go/codec v1.2.7 // indirect
+	github.com/urfave/cli v1.22.2 // indirect
+	github.com/vishvananda/netlink v1.1.1-0.20210330154013-f5de75959ad5 // indirect
+	github.com/vishvananda/netns v0.0.0-20210104183010-2eb08e3e575f // indirect
 	go.opencensus.io v0.23.0 // indirect
-	golang.org/x/crypto v0.0.0-20220315160706-3147a52a75dd // indirect
-	golang.org/x/net v0.0.0-20220225172249-27dd8689420f // indirect
-	golang.org/x/sys v0.0.0-20220319134239-a9b59b0215f8 // indirect
+	golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e // indirect
+	golang.org/x/net v0.0.0-20220531201128-c960675eff93 // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a // indirect
 	golang.org/x/text v0.3.7 // indirect
-	google.golang.org/genproto v0.0.0-20220317150908-0efb43f6373e // indirect
-	google.golang.org/grpc v1.45.0 // indirect
-	google.golang.org/protobuf v1.27.1 // indirect
+	google.golang.org/genproto v0.0.0-20220602131408-e326c6e8e9c8 // indirect
+	google.golang.org/grpc v1.47.0 // indirect
+	google.golang.org/protobuf v1.28.0 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

integration-tests/integration_test.go

@@ -34,15 +34,22 @@ func buildContainer() testcontainers.ContainerRequest {
 			"-tls-crt", "/tmp/server.pem",
 			"-tls-key", "/tmp/server.key",
 			"-trusted-header", "X-Real-IP",
+			"-enable-secure-headers",
 		},
 		ExposedPorts: []string{"8000:8000", "8001:8001"},
 		WaitingFor:   wait.ForLog("Starting TLS server listening on :8001"),
-		BindMounts: map[string]string{
-			"/tmp/GeoIP2-City-Test.mmdb":  filepath.Join(dir, "/../test/GeoIP2-City-Test.mmdb"),
-			"/tmp/GeoLite2-ASN-Test.mmdb": filepath.Join(dir, "/../test/GeoLite2-ASN-Test.mmdb"),
-			"/tmp/server.pem":             filepath.Join(dir, "/../test/server.pem"),
-			"/tmp/server.key":             filepath.Join(dir, "/../test/server.key"),
-		},
+		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"),
+		),
 	}
 
 	return req
@@ -69,16 +76,21 @@ func TestContainerIntegration(t *testing.T) {
 	}()
 
 	http.DefaultTransport.(*http.Transport).TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
-	for _, url := range []string{"http://localhost:8000/json", "https://localhost:8001/json"} {
-		resp, _ := http.Get(url)
+	for _, url := range []string{"http://localhost:8000", "https://localhost:8001"} {
+		client := &http.Client{}
+		req, _ := http.NewRequest("GET", url, nil)
+		req.Header.Set("Accept", "application/json")
+		resp, _ := client.Do(req)
 		assert.Equal(t, 200, resp.StatusCode)
 
-		var dat router.JSONResponse
 		body, err := ioutil.ReadAll(resp.Body)
 		if err != nil {
 			log.Fatal(err)
 		}
 
-		assert.NoError(t, json.Unmarshal(body, &dat))
+		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"))
 	}
 }

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

@@ -27,6 +27,8 @@ type settings struct {
 	TLSCrtPath          string
 	TLSKeyPath          string
 	TrustedHeader       string
+	TrustedPortHeader   string
+	EnableSecureHeaders bool
 	Server              serverSettings
 	version             bool
 }
@@ -68,12 +70,25 @@ 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(
+		&App.EnableSecureHeaders,
+		"enable-secure-headers",
+		false,
+		"Add sane security-related headers to every response",
+	)
 
 	err = flags.Parse(args)
 	if err != nil {
@@ -84,21 +99,25 @@ 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\n")
+	}
+
 	if App.GeodbPath.City == "" || App.GeodbPath.ASN == "" {
-		return "", fmt.Errorf("geoip2-city and geoip2-asn parameters are mandatory")
+		return "", fmt.Errorf("geoip2-city and geoip2-asn parameters are mandatory\n")
 	}
 
 	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 -tls-crt and -tls-key flags are mandatory\n")
 	}
 
 	if App.TemplatePath != "" {
 		info, err := os.Stat(App.TemplatePath)
 		if os.IsNotExist(err) {
-			return "", fmt.Errorf("%s no such file or directory", App.TemplatePath)
+			return "", fmt.Errorf("%s no such file or directory\n", App.TemplatePath)
 		}
 		if info.IsDir() {
-			return "", fmt.Errorf("%s must be a file", App.TemplatePath)
+			return "", fmt.Errorf("%s must be a file\n", App.TemplatePath)
 		}
 	}
 

internal/setting/app_test.go

@@ -8,51 +8,51 @@ 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", "-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")
 		})
 	}
@@ -70,12 +70,7 @@ func TestParseFlags(t *testing.T) {
 					City: "/city-path",
 					ASN:  "/asn-path",
 				},
-				TemplatePath:  "",
 				BindAddress: ":8080",
-				TLSAddress:    "",
-				TLSCrtPath:    "",
-				TLSKeyPath:    "",
-				TrustedHeader: "",
 				Server: serverSettings{
 					ReadTimeout:  10 * time.Second,
 					WriteTimeout: 10 * time.Second,
@@ -89,12 +84,7 @@ func TestParseFlags(t *testing.T) {
 					City: "/city-path",
 					ASN:  "/asn-path",
 				},
-				TemplatePath:  "",
 				BindAddress: ":8001",
-				TLSAddress:    "",
-				TLSCrtPath:    "",
-				TLSKeyPath:    "",
-				TrustedHeader: "",
 				Server: serverSettings{
 					ReadTimeout:  10 * time.Second,
 					WriteTimeout: 10 * time.Second,
@@ -111,12 +101,10 @@ func TestParseFlags(t *testing.T) {
 					City: "/city-path",
 					ASN:  "/asn-path",
 				},
-				TemplatePath:  "",
 				BindAddress: ":8080",
 				TLSAddress:  ":9000",
 				TLSCrtPath:  "/crt-path",
 				TLSKeyPath:  "/key-path",
-				TrustedHeader: "",
 				Server: serverSettings{
 					ReadTimeout:  10 * time.Second,
 					WriteTimeout: 10 * time.Second,
@@ -126,19 +114,35 @@ func TestParseFlags(t *testing.T) {
 		{
 			[]string{
 				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path",
-				"-trusted-header", "header",
+				"-trusted-header", "header", "-trusted-port-header", "port-header",
 			},
 			settings{
 				GeodbPath: geodbPath{
 					City: "/city-path",
 					ASN:  "/asn-path",
 				},
-				TemplatePath:  "",
 				BindAddress:       ":8080",
-				TLSAddress:    "",
-				TLSCrtPath:    "",
-				TLSKeyPath:    "",
 				TrustedHeader:     "header",
+				TrustedPortHeader: "port-header",
+				Server: serverSettings{
+					ReadTimeout:  10 * time.Second,
+					WriteTimeout: 10 * time.Second,
+				},
+			},
+		},
+		{
+			[]string{
+				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path",
+				"-trusted-header", "header", "-enable-secure-headers",
+			},
+			settings{
+				GeodbPath: geodbPath{
+					City: "/city-path",
+					ASN:  "/asn-path",
+				},
+				BindAddress:         ":8080",
+				TrustedHeader:       "header",
+				EnableSecureHeaders: true,
 				Server: serverSettings{
 					ReadTimeout:  10 * time.Second,
 					WriteTimeout: 10 * time.Second,
@@ -150,7 +154,7 @@ 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))
 		})
 	}
@@ -188,6 +192,6 @@ 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")
 }

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)
-	if reg.Match([]byte(ctx.Request.UserAgent())) {
-		ctx.String(http.StatusOK, ctx.ClientIP())
-	} else {
+	switch ctx.NegotiateFormat(gin.MIMEPlain, gin.MIMEHTML, gin.MIMEJSON) {
+	case gin.MIMEHTML:
 		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, port+"\n")
+	ctx.String(http.StatusOK, getClientPort(ctx)+"\n")
 }
 
 func getAllAsString(ctx *gin.Context) {
 	output := "IP: " + ctx.ClientIP() + "\n"
-	_, port, _ := net.SplitHostPort(ctx.Request.RemoteAddr)
-	output += "Client Port: " + port + "\n"
+	output += "Client Port: " + getClientPort(ctx) + "\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["Host"] = []string{ctx.Request.Host}
+	h := httputils.GetHeadersWithoutTrustedHeaders(ctx)
+	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) {
-	uas := []string{
-		"",
-		"curl",
-		"wget",
-		"libwww-perl",
-		"python",
-		"ansible-httpget",
-		"HTTPie",
-		"WindowsPowerShell",
-		"http_request",
-		"Go-http-client",
+func TestRootContentType(t *testing.T) {
+	tests := []struct {
+		name     string
+		accepted string
+		expected string
+	}{
+		{
+			name:     "Accept wildcard",
+			accepted: "*/*",
+			expected: contentType.text,
+		},
+		{
+			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("X-Real-IP", testIP.ipv4)
-
-	for _, ua := range uas {
-		req.Header.Set("User-Agent", ua)
+			req.Header.Set(trustedHeader, testIP.ipv4)
+			req.Header.Set("Accept", tt.accepted)
 
 			w := httptest.NewRecorder()
 			app.ServeHTTP(w, req)
 
 			assert.Equal(t, 200, w.Code)
-		assert.Equal(t, testIP.ipv4, w.Body.String())
+			assert.Equal(t, tt.expected, w.Header().Get("Content-Type"))
+		})
+	}
+}
+
+func TestGetIP(t *testing.T) {
+	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)
+
+			w := httptest.NewRecorder()
+			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) {
+	type args struct {
+		params  []string
+		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",
+		},
+	}
+
+	for _, tt := range tests {
+		_, _ = 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.Set("X-Real-IP", testIP.ipv4)
+			req.Header = tt.args.headers
 
 			w := httptest.NewRecorder()
 			app.ServeHTTP(w, req)
 
 			assert.Equal(t, 200, w.Code)
 			assert.Equal(t, contentType.text, w.Header().Get("Content-Type"))
-	assert.Equal(t, "1000\n", w.Body.String())
+			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"]}}`
-	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":""}`
+	_, _ = setting.Setup(
+		[]string{
+			"-geoip2-city", "city",
+			"-geoip2-asn", "asn",
+			"-trusted-header", trustedHeader,
+			"-trusted-port-header", trustedPortHeader,
+		},
+	)
 
+	type args struct {
+		ip string
+	}
+	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(testIP.ipv4, "1000")
+			req.RemoteAddr = net.JoinHostPort(tt.args.ip, "1000")
 			req.Host = "test"
-	req.Header.Set("X-Real-IP", testIP.ipv4)
+			req.Header.Set(trustedHeader, tt.args.ip)
+			req.Header.Set(trustedPortHeader, "1001")
 
 			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, expectedIPv4, 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())
+			assert.JSONEq(t, tt.expected, 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["Host"] = []string{ctx.Request.Host}
+	h := httputils.GetHeadersWithoutTrustedHeaders(ctx)
+	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/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()