From cc6208b483394153bd449a476a4dd3360a802657 Mon Sep 17 00:00:00 2001
From: Evan Chen <evan@kumoly.io>
Date: Sat, 16 Oct 2021 23:50:05 +0800
Subject: [PATCH] feat: add minimal basic client

---
 Makefile      |   9 ++++
 basic/main.go | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 120 insertions(+)
 create mode 100644 basic/main.go

diff --git a/Makefile b/Makefile
index a8b9883..9ab89e5 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,10 @@ install:
 clean:
 	rm -rf dist
 
+.PHONY: basic
+basic:
+	go build ${LDFLAGS} -o dist/myip-basic basic/main.go
+
 build:
 	go build ${LDFLAGS} -o dist/myip
 
@@ -26,11 +30,16 @@ build-unix:
 	$(foreach GOOS, $(PLATFORMS), $(foreach GOARCH, $(ARCHITECTURES), \
 	$(shell export GOOS=$(GOOS); export GOARCH=$(GOARCH); go build ${LDFLAGS} -o dist/$(PROJ)_$(VERSION)_$(GOOS)_$(GOARCH)/$(PROJ))))
 
+	$(foreach GOOS, $(PLATFORMS), $(foreach GOARCH, $(ARCHITECTURES), \
+	$(shell export GOOS=$(GOOS); export GOARCH=$(GOARCH); go build ${LDFLAGS} -o dist/$(PROJ)_$(VERSION)_$(GOOS)_$(GOARCH)/$(PROJ)-basic basic/main.go)))
+
 build-win:
 	$(shell export GOOS=windows; export GOARCH=amd64; go build ${LDFLAGS} -o dist/$(PROJ)_$(VERSION)_windows_amd64/$(PROJ).exe)
+	$(shell export GOOS=windows; export GOARCH=amd64; go build ${LDFLAGS} -o dist/$(PROJ)_$(VERSION)_windows_amd64/$(PROJ)-basic.exe basic/main.go)
 
 build-mac-m1:
 	$(shell export GOOS=darwin; export GOARCH=arm64; go build ${LDFLAGS} -o dist/$(PROJ)_$(VERSION)_darwin_arm64/$(PROJ))
+	$(shell export GOOS=darwin; export GOARCH=arm64; go build ${LDFLAGS} -o dist/$(PROJ)_$(VERSION)_darwin_arm64/$(PROJ)-basic basic/main.go)
 
 build-zip:
 	cd dist; for f in * ;do if ! [[ $$f =~ "gz" ]] ; then tar -czf $${f}.tar.gz $${f}; fi done
diff --git a/basic/main.go b/basic/main.go
new file mode 100644
index 0000000..d12d0bc
--- /dev/null
+++ b/basic/main.go
@@ -0,0 +1,111 @@
+package main
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+)
+
+var (
+	port string
+	host string
+
+	showVer bool
+)
+
+var name string
+
+var Version = "v0.1.0"
+var Build = "v0.1.0"
+
+func init() {
+	name, _ = os.Hostname()
+	flag.BoolVar(&showVer, "v", false, "show version")
+	flag.StringVar(&host, "u", "kumoly.io", "hostname to ask for")
+	flag.StringVar(&port, "p", "5080", "port to listen|connect")
+
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage: myip-basic [options]\n")
+		flag.PrintDefaults()
+	}
+}
+
+func main() {
+	flag.Parse()
+	if showVer {
+		fmt.Println(Version + "-" + Build)
+		return
+	}
+
+	fmt.Printf("%s ", GetPublicIP())
+	for _, v := range GetLocalIP() {
+		fmt.Printf("%s ", v)
+	}
+	fmt.Printf("\n")
+}
+
+func GetLocalIP() []string {
+	ret := []string{}
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		log.Println(err)
+		return ret
+	}
+	for _, i := range ifaces {
+		addrs, err := i.Addrs()
+		if err != nil {
+			log.Println(err)
+			return ret
+		}
+		for _, addr := range addrs {
+			var ip net.IP
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+				if ip.IsLoopback() {
+					continue
+				}
+				if ip.To4() == nil {
+					continue
+				}
+			default:
+				continue
+			}
+			ret = append(ret, ip.String())
+			break
+		}
+	}
+	return ret
+}
+
+func GetPublicIP() string {
+	protocol := "http://"
+	req, _ := http.NewRequest("GET", protocol+host+":"+port+"?name="+name, nil)
+	client := &http.Client{
+		Timeout: time.Second * 10,
+	}
+	res, err := client.Do(req)
+	if err != nil {
+		log.Println(err)
+		return ""
+	}
+	if res.StatusCode != 200 {
+		err = errors.New("http status error: " + res.Status)
+		log.Println(err)
+		return ""
+	}
+	defer res.Body.Close()
+	body, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		log.Println(err)
+		return ""
+	}
+	return strings.TrimRight(string(body), "\r\n")
+}