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package main
import (
"encoding/hex"
"log"
"net"
"net/http"
"github.com/gin-gonic/gin"
"github.com/spf13/viper"
_ "embed"
)
var (
hwAddr net.HardwareAddr
ipAddr net.IP
)
//go:embed index.html
var htmlStr string
// 网页应用
// 1. 添加主机，包括ip、端口、mac地址（可以预先手动添加）
// 2. 发送数据包
// 3. 检测对应主机是否已启动
func main() {
viper.SetConfigFile("config.yml")
if err := viper.ReadInConfig(); err != nil {
if _, ok := err.(viper.ConfigFileNotFoundError); ok {
log.Fatalf("config file not found, create one: %v", err)
} else {
log.Fatalf("config file read error: %v", err)
}
}
ip := viper.GetString("ip")
mac := viper.GetString("mac")
log.Printf("ip: %s, mac: %s", ip, mac)
var err error
hwAddr, err = net.ParseMAC(mac)
if err != nil {
log.Fatalf("invalid mac address: %s", mac)
}
ipAddr = net.ParseIP(ip)
r := gin.Default()
r.Use(gin.BasicAuth(gin.Accounts{
"user": "password",
}))
r.GET("/wol", func(c *gin.Context) {
err := WakeOnLAN(hwAddr, ipAddr, 9)
if err != nil {
log.Printf("error: %v", err)
c.JSON(http.StatusInternalServerError, gin.H{
"message": err.Error(),
})
return
}
c.JSON(http.StatusOK, gin.H{
"message": "ok",
})
})
r.GET("/", func(c *gin.Context) {
c.Status(http.StatusOK)
c.Header("Content-Type", "text/html")
c.Writer.Write([]byte(htmlStr))
})
r.Run(viper.GetString("server_addr"))
}
func newMagicPacket(addr net.HardwareAddr) []byte {
const (
magicPacketHeader = "ffffffffffff"
macRepeatCount = 16
)
header, _ := hex.DecodeString(magicPacketHeader)
packet := make([]byte, len(header)+(len(addr)*macRepeatCount))
copy(packet, header)
macs := make([]byte, len(addr)*macRepeatCount)
for i := range macs {
macs[i] = addr[i%len(addr)]
}
copy(packet[len(header):], macs)
return packet
}
func WakeOnLAN(hwAddr net.HardwareAddr, ipAddr net.IP, wolPort int) error {
conn, err := net.DialUDP("udp", nil, &net.UDPAddr{
IP: ipAddr,
Port: wolPort,
})
if err != nil {
return err
}
defer conn.Close()
packet := newMagicPacket(hwAddr)
for i := 0; i < 3; i++ {
_, err = conn.Write(packet)
if err != nil {
return err
}
}
return nil
}
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