// Copyright 2015 Matthew Holt and The Caddy Authors // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package caddycmd import ( "bytes" "crypto/rand" "encoding/json" "fmt" "io" "io/ioutil" "log" "net" "net/http" "os" "os/exec" "reflect" "runtime/debug" "sort" "strings" "github.com/caddyserver/caddy/v2" "github.com/caddyserver/caddy/v2/caddyconfig" "github.com/mholt/certmagic" "go.uber.org/zap" ) func cmdStart(fl Flags) (int, error) { startCmdConfigFlag := fl.String("config") startCmdConfigAdapterFlag := fl.String("adapter") // open a listener to which the child process will connect when // it is ready to confirm that it has successfully started ln, err := net.Listen("tcp", "127.0.0.1:0") if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("opening listener for success confirmation: %v", err) } defer ln.Close() // craft the command with a pingback address and with a // pipe for its stdin, so we can tell it our confirmation // code that we expect so that some random port scan at // the most unfortunate time won't fool us into thinking // the child succeeded (i.e. the alternative is to just // wait for any connection on our listener, but better to // ensure it's the process we're expecting - we can be // sure by giving it some random bytes and having it echo // them back to us) cmd := exec.Command(os.Args[0], "run", "--pingback", ln.Addr().String()) if startCmdConfigFlag != "" { cmd.Args = append(cmd.Args, "--config", startCmdConfigFlag) } if startCmdConfigAdapterFlag != "" { cmd.Args = append(cmd.Args, "--adapter", startCmdConfigAdapterFlag) } stdinpipe, err := cmd.StdinPipe() if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("creating stdin pipe: %v", err) } cmd.Stdout = os.Stdout cmd.Stderr = os.Stderr // generate the random bytes we'll send to the child process expect := make([]byte, 32) _, err = rand.Read(expect) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("generating random confirmation bytes: %v", err) } // begin writing the confirmation bytes to the child's // stdin; use a goroutine since the child hasn't been // started yet, and writing sychronously would result // in a deadlock go func() { stdinpipe.Write(expect) stdinpipe.Close() }() // start the process err = cmd.Start() if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("starting caddy process: %v", err) } // there are two ways we know we're done: either // the process will connect to our listener, or // it will exit with an error success, exit := make(chan struct{}), make(chan error) // in one goroutine, we await the success of the child process go func() { for { conn, err := ln.Accept() if err != nil { if !strings.Contains(err.Error(), "use of closed network connection") { log.Println(err) } break } err = handlePingbackConn(conn, expect) if err == nil { close(success) break } log.Println(err) } }() // in another goroutine, we await the failure of the child process go func() { err := cmd.Wait() // don't send on this line! Wait blocks, but send starts before it unblocks exit <- err // sending on separate line ensures select won't trigger until after Wait unblocks }() // when one of the goroutines unblocks, we're done and can exit select { case <-success: fmt.Printf("Successfully started Caddy (pid=%d)\n", cmd.Process.Pid) case err := <-exit: return caddy.ExitCodeFailedStartup, fmt.Errorf("caddy process exited with error: %v", err) } return caddy.ExitCodeSuccess, nil } func cmdRun(fl Flags) (int, error) { runCmdConfigFlag := fl.String("config") runCmdConfigAdapterFlag := fl.String("adapter") runCmdPrintEnvFlag := fl.Bool("environ") runCmdPingbackFlag := fl.String("pingback") // if we are supposed to print the environment, do that first if runCmdPrintEnvFlag { printEnvironment() } // get the config in caddy's native format config, err := loadConfig(runCmdConfigFlag, runCmdConfigAdapterFlag) if err != nil { return caddy.ExitCodeFailedStartup, err } // set a fitting User-Agent for ACME requests goModule := caddy.GoModule() cleanModVersion := strings.TrimPrefix(goModule.Version, "v") certmagic.UserAgent = "Caddy/" + cleanModVersion // run the initial config err = caddy.Load(config, true) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("loading initial config: %v", err) } if len(config) > 0 { caddy.Log().Named("admin").Info("Caddy 2 serving initial configuration") } // if we are to report to another process the successful start // of the server, do so now by echoing back contents of stdin if runCmdPingbackFlag != "" { confirmationBytes, err := ioutil.ReadAll(os.Stdin) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("reading confirmation bytes from stdin: %v", err) } conn, err := net.Dial("tcp", runCmdPingbackFlag) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("dialing confirmation address: %v", err) } defer conn.Close() _, err = conn.Write(confirmationBytes) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("writing confirmation bytes to %s: %v", runCmdPingbackFlag, err) } } select {} } func cmdStop(fl Flags) (int, error) { stopCmdAddrFlag := fl.String("address") adminAddr := caddy.DefaultAdminListen if stopCmdAddrFlag != "" { adminAddr = stopCmdAddrFlag } stopEndpoint := fmt.Sprintf("http://%s/stop", adminAddr) req, err := http.NewRequest(http.MethodPost, stopEndpoint, nil) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("making request: %v", err) } req.Header.Set("Origin", adminAddr) err = apiRequest(req) if err != nil { caddy.Log().Warn("failed using API to stop instance", zap.String("endpoint", stopEndpoint), zap.Error(err), ) return caddy.ExitCodeFailedStartup, err } return caddy.ExitCodeSuccess, nil } func cmdReload(fl Flags) (int, error) { reloadCmdConfigFlag := fl.String("config") reloadCmdConfigAdapterFlag := fl.String("adapter") reloadCmdAddrFlag := fl.String("address") // a configuration is required if reloadCmdConfigFlag == "" { return caddy.ExitCodeFailedStartup, fmt.Errorf("no configuration to load (use --config)") } // get the config in caddy's native format config, err := loadConfig(reloadCmdConfigFlag, reloadCmdConfigAdapterFlag) if err != nil { return caddy.ExitCodeFailedStartup, err } // get the address of the admin listener and craft endpoint URL adminAddr := reloadCmdAddrFlag if adminAddr == "" { var tmpStruct struct { Admin caddy.AdminConfig `json:"admin"` } err = json.Unmarshal(config, &tmpStruct) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("unmarshaling admin listener address from config: %v", err) } adminAddr = tmpStruct.Admin.Listen } if adminAddr == "" { adminAddr = caddy.DefaultAdminListen } loadEndpoint := fmt.Sprintf("http://%s/load", adminAddr) // prepare the request to update the configuration req, err := http.NewRequest(http.MethodPost, loadEndpoint, bytes.NewReader(config)) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("making request: %v", err) } req.Header.Set("Content-Type", "application/json") req.Header.Set("Origin", adminAddr) err = apiRequest(req) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("sending configuration to instance: %v", err) } return caddy.ExitCodeSuccess, nil } func cmdVersion(_ Flags) (int, error) { goModule := caddy.GoModule() if goModule.Sum != "" { // a build with a known version will also have a checksum fmt.Printf("%s %s\n", goModule.Version, goModule.Sum) } else { fmt.Println(goModule.Version) } return caddy.ExitCodeSuccess, nil } func cmdListModules(fl Flags) (int, error) { versions := fl.Bool("versions") bi, ok := debug.ReadBuildInfo() if !ok || !versions { // if there's no build information, // just print out the modules for _, m := range caddy.Modules() { fmt.Println(m) } return caddy.ExitCodeSuccess, nil } for _, modID := range caddy.Modules() { modInfo, err := caddy.GetModule(modID) if err != nil { // that's weird fmt.Println(modID) continue } // to get the Caddy plugin's version info, we need to know // the package that the Caddy module's value comes from; we // can use reflection but we need a non-pointer value (I'm // not sure why), and since New() should return a pointer // value, we need to dereference it first iface := interface{}(modInfo.New()) if rv := reflect.ValueOf(iface); rv.Kind() == reflect.Ptr { iface = reflect.New(reflect.TypeOf(iface).Elem()).Elem().Interface() } modPkgPath := reflect.TypeOf(iface).PkgPath() // now we find the Go module that the Caddy module's package // belongs to; we assume the Caddy module package path will // be prefixed by its Go module path, and we will choose the // longest matching prefix in case there are nested modules var matched *debug.Module for _, dep := range bi.Deps { if strings.HasPrefix(modPkgPath, dep.Path) { if matched == nil || len(dep.Path) > len(matched.Path) { matched = dep } } } // if we could find no matching module, just print out // the module ID instead if matched == nil { fmt.Println(modID) continue } fmt.Printf("%s %s\n", modID, matched.Version) } return caddy.ExitCodeSuccess, nil } func cmdEnviron(_ Flags) (int, error) { printEnvironment() return caddy.ExitCodeSuccess, nil } func cmdAdaptConfig(fl Flags) (int, error) { adaptCmdInputFlag := fl.String("config") adaptCmdAdapterFlag := fl.String("adapter") adaptCmdPrettyFlag := fl.Bool("pretty") adaptCmdValidateFlag := fl.Bool("validate") if adaptCmdAdapterFlag == "" || adaptCmdInputFlag == "" { return caddy.ExitCodeFailedStartup, fmt.Errorf("--adapter and --config flags are required") } cfgAdapter := caddyconfig.GetAdapter(adaptCmdAdapterFlag) if cfgAdapter == nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("unrecognized config adapter: %s", adaptCmdAdapterFlag) } input, err := ioutil.ReadFile(adaptCmdInputFlag) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("reading input file: %v", err) } opts := make(map[string]interface{}) if adaptCmdPrettyFlag { opts["pretty"] = "true" } adaptedConfig, warnings, err := cfgAdapter.Adapt(input, opts) if err != nil { return caddy.ExitCodeFailedStartup, err } // print warnings to stderr for _, warn := range warnings { msg := warn.Message if warn.Directive != "" { msg = fmt.Sprintf("%s: %s", warn.Directive, warn.Message) } fmt.Fprintf(os.Stderr, "[WARNING][%s] %s:%d: %s\n", adaptCmdAdapterFlag, warn.File, warn.Line, msg) } // print result to stdout fmt.Println(string(adaptedConfig)) // validate output if requested if adaptCmdValidateFlag { var cfg *caddy.Config err = json.Unmarshal(adaptedConfig, &cfg) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("decoding config: %v", err) } err = caddy.Validate(cfg) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("validation: %v", err) } } return caddy.ExitCodeSuccess, nil } func cmdValidateConfig(fl Flags) (int, error) { validateCmdConfigFlag := fl.String("config") validateCmdAdapterFlag := fl.String("adapter") input, err := ioutil.ReadFile(validateCmdConfigFlag) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("reading input file: %v", err) } if validateCmdAdapterFlag != "" { cfgAdapter := caddyconfig.GetAdapter(validateCmdAdapterFlag) if cfgAdapter == nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("unrecognized config adapter: %s", validateCmdAdapterFlag) } adaptedConfig, warnings, err := cfgAdapter.Adapt(input, nil) if err != nil { return caddy.ExitCodeFailedStartup, err } // print warnings to stderr for _, warn := range warnings { msg := warn.Message if warn.Directive != "" { msg = fmt.Sprintf("%s: %s", warn.Directive, warn.Message) } fmt.Fprintf(os.Stderr, "[WARNING][%s] %s:%d: %s\n", validateCmdAdapterFlag, warn.File, warn.Line, msg) } input = adaptedConfig } input = caddy.RemoveMetaFields(input) var cfg *caddy.Config err = json.Unmarshal(input, &cfg) if err != nil { return caddy.ExitCodeFailedStartup, fmt.Errorf("decoding config: %v", err) } err = caddy.Validate(cfg) if err != nil { return caddy.ExitCodeFailedStartup, err } fmt.Println("Valid configuration") return caddy.ExitCodeSuccess, nil } func cmdHelp(fl Flags) (int, error) { const fullDocs = `Full documentation is available at: https://github.com/caddyserver/caddy/wiki/v2:-Documentation` args := fl.Args() if len(args) == 0 { s := `Caddy is an extensible server platform. usage: caddy [] commands: ` keys := make([]string, 0, len(commands)) for k := range commands { keys = append(keys, k) } sort.Strings(keys) for _, k := range keys { cmd := commands[k] short := strings.TrimSuffix(cmd.Short, ".") s += fmt.Sprintf(" %-15s %s\n", cmd.Name, short) } s += "\nUse 'caddy help ' for more information about a command.\n" s += "\n" + fullDocs + "\n" fmt.Print(s) return caddy.ExitCodeSuccess, nil } else if len(args) > 1 { return caddy.ExitCodeFailedStartup, fmt.Errorf("can only give help with one command") } subcommand, ok := commands[args[0]] if !ok { return caddy.ExitCodeFailedStartup, fmt.Errorf("unknown command: %s", args[0]) } helpText := strings.TrimSpace(subcommand.Long) if helpText == "" { helpText = subcommand.Short if !strings.HasSuffix(helpText, ".") { helpText += "." } } result := fmt.Sprintf("%s\n\nusage:\n caddy %s %s\n", helpText, subcommand.Name, strings.TrimSpace(subcommand.Usage), ) if help := flagHelp(subcommand.Flags); help != "" { result += fmt.Sprintf("\nflags:\n%s", help) } result += "\n" + fullDocs + "\n" fmt.Print(result) return caddy.ExitCodeSuccess, nil } func apiRequest(req *http.Request) error { resp, err := http.DefaultClient.Do(req) if err != nil { return fmt.Errorf("performing request: %v", err) } defer resp.Body.Close() // if it didn't work, let the user know if resp.StatusCode >= 400 { respBody, err := ioutil.ReadAll(io.LimitReader(resp.Body, 1024*10)) if err != nil { return fmt.Errorf("HTTP %d: reading error message: %v", resp.StatusCode, err) } return fmt.Errorf("caddy responded with error: HTTP %d: %s", resp.StatusCode, respBody) } return nil }