first commit

.gitignore

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+bin

Dockerfile

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+FROM golang:1.17.2-alpine3.14 as builder
+
+WORKDIR /src
+COPY . .
+RUN go build -o /go/bin/myip main.go
+
+FROM alpine:3.14
+EXPOSE 5080
+
+COPY --from=builder /go/bin/myip /go/bin/myip
+ENTRYPOINT ["/go/bin/myip"]

Makefile

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+build:
+	go build -o bin/myip

README.md

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+# Myip
+
+a tool that can get your public ip
+
+
+```shell
+Usage of myip:
+  -b string
+        the address the server binds on (default "0.0.0.0")
+  -p string
+        port to listen|connect (default "5080")
+  -s    run in server mode
+  -u string
+        hostname to ask for (default "kumoly.io")
+```
+
+env: `MYIP_PORT`, `MYIP_HOST`

go.mod

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+module kumoly.io/tools/myip
+
+go 1.17

main.go

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+package main
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"os"
+	"strings"
+)
+
+var (
+	serverMode bool
+	addr       string
+	port       string
+	envP       string
+	host       string
+	envHost    string
+)
+
+func init() {
+	envP = os.Getenv("MYIP_PORT")
+	envHost = os.Getenv("MYIP_HOST")
+
+	flag.BoolVar(&serverMode, "s", false, "run in server mode")
+	flag.StringVar(&host, "u", "kumoly.io", "hostname to ask for")
+	flag.StringVar(&port, "p", "5080", "port to listen|connect")
+	flag.StringVar(&addr, "b", "0.0.0.0", "the address the server binds on")
+}
+
+func usage() {
+	fmt.Fprintf(os.Stderr, "Usage: myip [options]\n")
+	flag.PrintDefaults()
+}
+
+func main() {
+	flag.Parse()
+	if envP != "" {
+		port = envP
+	}
+	if envHost != "" {
+		host = envHost
+	}
+
+	if serverMode {
+		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+			ip := r.Header.Get("X-Real-Ip")
+			if ip == "" {
+				ip = r.Header.Get("X-Forwarded-For")
+			}
+			if ip == "" {
+				var err error
+				ip, _, err = net.SplitHostPort(r.RemoteAddr)
+				if err != nil {
+					ip = r.RemoteAddr
+				}
+			}
+			fmt.Fprint(w, ip+"\n")
+		})
+
+		err := http.ListenAndServe(addr+":"+port, nil)
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+
+	} else {
+		res, err := http.Get("http://" + host + ":" + port)
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(2)
+		}
+		body, err := ioutil.ReadAll(res.Body)
+		res.Body.Close()
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(3)
+		}
+		fmt.Println(strings.TrimRight(string(body), "\r\n"))
+	}
+}