133 lines
3.0 KiB
Go
133 lines
3.0 KiB
Go
package main
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import (
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"fmt"
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"log"
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"net"
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"net/http"
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"os"
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"path/filepath"
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"strconv"
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"github.com/gobuffalo/packr"
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)
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// VersionString will be set through ldflags, contains current version
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var VersionString = "undefined"
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func main() {
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log.Printf("AdGuard DNS web interface backend, version %s\n", VersionString)
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box := packr.NewBox("build/static")
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{
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executable, err := os.Executable()
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if err != nil {
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panic(err)
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}
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config.ourBinaryDir = filepath.Dir(executable)
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}
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// config can be specified, which reads options from there, but other command line flags have to override config values
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// therefore, we must do it manually instead of using a lib
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{
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var configFilename *string
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var bindHost *string
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var bindPort *int
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var opts = []struct {
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longName string
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shortName string
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description string
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callback func(value string)
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}{
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{"config", "c", "path to config file", func(value string) { configFilename = &value }},
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{"host", "h", "host address to bind HTTP server on", func(value string) { bindHost = &value }},
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{"port", "p", "port to serve HTTP pages on", func(value string) {
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v, err := strconv.Atoi(value)
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if err != nil {
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panic("Got port that is not a number")
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}
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bindPort = &v
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}},
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{"help", "h", "print this help", nil},
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}
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printHelp := func() {
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fmt.Printf("Usage:\n\n")
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fmt.Printf("%s [options]\n\n", os.Args[0])
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fmt.Printf("Options:\n")
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for _, opt := range opts {
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fmt.Printf(" -%s, %-30s %s\n", opt.shortName, "--"+opt.longName, opt.description)
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}
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}
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for i := 1; i < len(os.Args); i++ {
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v := os.Args[i]
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// short-circuit for help
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if v == "--help" || v == "-h" {
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printHelp()
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os.Exit(64)
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}
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knownParam := false
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for _, opt := range opts {
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if v == "--"+opt.longName {
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if i+1 > len(os.Args) {
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log.Printf("ERROR: Got %s without argument\n", v)
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os.Exit(64)
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}
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i++
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opt.callback(os.Args[i])
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knownParam = true
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break
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}
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if v == "-"+opt.shortName {
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if i+1 > len(os.Args) {
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log.Printf("ERROR: Got %s without argument\n", v)
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os.Exit(64)
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}
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i++
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opt.callback(os.Args[i])
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knownParam = true
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break
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}
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}
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if !knownParam {
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log.Printf("ERROR: unknown option %v\n", v)
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printHelp()
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os.Exit(64)
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}
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}
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if configFilename != nil {
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config.ourConfigFilename = *configFilename
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}
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// parse from config file
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err := parseConfig()
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if err != nil {
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log.Fatal(err)
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}
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if bindHost != nil {
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config.BindHost = *bindHost
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}
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if bindPort != nil {
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config.BindPort = *bindPort
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}
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}
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err := writeConfig()
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if err != nil {
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log.Fatal(err)
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}
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address := net.JoinHostPort(config.BindHost, strconv.Itoa(config.BindPort))
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runFilterRefreshers()
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http.Handle("/", optionalAuthHandler(http.FileServer(box)))
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registerControlHandlers()
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err = startDNSServer()
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if err != nil {
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log.Fatal(err)
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}
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URL := fmt.Sprintf("http://%s", address)
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log.Println("Go to " + URL)
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log.Fatal(http.ListenAndServe(address, nil))
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}
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