mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-16 21:56:40 -05:00
226 lines
6.3 KiB
Go
226 lines
6.3 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddycmd
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import (
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"crypto/rand"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"github.com/caddyserver/caddy"
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"github.com/mholt/certmagic"
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"github.com/mitchellh/go-ps"
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)
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func cmdStart() (int, error) {
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startCmd := flag.NewFlagSet("start", flag.ExitOnError)
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startCmdConfigFlag := startCmd.String("config", "", "Configuration file")
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startCmd.Parse(os.Args[2:])
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// open a listener to which the child process will connect when
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// it is ready to confirm that it has successfully started
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ln, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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return 1, fmt.Errorf("opening listener for success confirmation: %v", err)
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}
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defer ln.Close()
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// craft the command with a pingback address and with a
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// pipe for its stdin, so we can tell it our confirmation
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// code that we expect so that some random port scan at
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// the most unfortunate time won't fool us into thinking
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// the child succeeded (i.e. the alternative is to just
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// wait for any connection on our listener, but better to
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// ensure it's the process we're expecting - we can be
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// sure by giving it some random bytes and having it echo
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// them back to us)
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cmd := exec.Command(os.Args[0], "run", "--pingback", ln.Addr().String())
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if *startCmdConfigFlag != "" {
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cmd.Args = append(cmd.Args, "--config", *startCmdConfigFlag)
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}
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stdinpipe, err := cmd.StdinPipe()
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if err != nil {
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return 1, fmt.Errorf("creating stdin pipe: %v", err)
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}
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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// generate the random bytes we'll send to the child process
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expect := make([]byte, 32)
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_, err = rand.Read(expect)
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if err != nil {
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return 1, fmt.Errorf("generating random confirmation bytes: %v", err)
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}
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// begin writing the confirmation bytes to the child's
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// stdin; use a goroutine since the child hasn't been
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// started yet, and writing sychronously would result
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// in a deadlock
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go func() {
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stdinpipe.Write(expect)
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stdinpipe.Close()
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}()
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// start the process
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err = cmd.Start()
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if err != nil {
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return 1, fmt.Errorf("starting caddy process: %v", err)
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}
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// there are two ways we know we're done: either
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// the process will connect to our listener, or
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// it will exit with an error
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success, exit := make(chan struct{}), make(chan error)
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// in one goroutine, we await the success of the child process
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go func() {
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for {
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conn, err := ln.Accept()
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if err != nil {
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log.Println(err)
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break
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}
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err = handlePingbackConn(conn, expect)
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if err == nil {
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close(success)
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break
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}
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log.Println(err)
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}
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}()
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// in another goroutine, we await the failure of the child process
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go func() {
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err = cmd.Wait() // don't send on this line! Wait blocks, but send starts before it unblocks
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exit <- err // sending on separate line ensures select won't trigger until after Wait unblocks
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}()
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// when one of the goroutines unblocks, we're done and can exit
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select {
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case <-success:
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fmt.Println("Successfully started Caddy")
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case err := <-exit:
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return 1, fmt.Errorf("caddy process exited with error: %v", err)
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}
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return 0, nil
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}
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func cmdRun() (int, error) {
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runCmd := flag.NewFlagSet("run", flag.ExitOnError)
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runCmdConfigFlag := runCmd.String("config", "", "Configuration file")
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runCmdPingbackFlag := runCmd.String("pingback", "", "Echo confirmation bytes to this address on success")
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runCmd.Parse(os.Args[2:])
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// if a config file was specified for bootstrapping
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// the server instance, load it now
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var config []byte
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if *runCmdConfigFlag != "" {
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var err error
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config, err = ioutil.ReadFile(*runCmdConfigFlag)
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if err != nil {
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return 1, fmt.Errorf("reading config file: %v", err)
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}
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}
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// set a fitting User-Agent for ACME requests
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goModule := caddy.GoModule()
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cleanModVersion := strings.TrimPrefix(goModule.Version, "v")
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certmagic.UserAgent = "Caddy/" + cleanModVersion
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// start the admin endpoint along with any initial config
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err := caddy.StartAdmin(config)
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if err != nil {
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return 0, fmt.Errorf("starting caddy administration endpoint: %v", err)
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}
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defer caddy.StopAdmin()
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// if we are to report to another process the successful start
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// of the server, do so now by echoing back contents of stdin
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if *runCmdPingbackFlag != "" {
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confirmationBytes, err := ioutil.ReadAll(os.Stdin)
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if err != nil {
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return 1, fmt.Errorf("reading confirmation bytes from stdin: %v", err)
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}
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conn, err := net.Dial("tcp", *runCmdPingbackFlag)
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if err != nil {
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return 1, fmt.Errorf("dialing confirmation address: %v", err)
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}
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defer conn.Close()
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_, err = conn.Write(confirmationBytes)
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if err != nil {
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return 1, fmt.Errorf("writing confirmation bytes to %s: %v", *runCmdPingbackFlag, err)
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}
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}
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select {}
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}
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func cmdStop() (int, error) {
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processList, err := ps.Processes()
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if err != nil {
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return 1, fmt.Errorf("listing processes: %v", err)
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}
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thisProcName := filepath.Base(os.Args[0])
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var found bool
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for _, p := range processList {
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// the process we're looking for should have the same name but different PID
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if p.Executable() == thisProcName && p.Pid() != os.Getpid() {
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found = true
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fmt.Printf("pid=%d\n", p.Pid())
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fmt.Printf("Graceful stop...")
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if err := gracefullyStopProcess(p.Pid()); err != nil {
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return 1, err
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}
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}
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}
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if !found {
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return 1, fmt.Errorf("Caddy is not running")
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}
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fmt.Println(" success")
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return 0, nil
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}
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func cmdVersion() (int, error) {
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goModule := caddy.GoModule()
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if goModule.Sum != "" {
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// a build with a known version will also have a checksum
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fmt.Printf("%s %s\n", goModule.Version, goModule.Sum)
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} else {
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fmt.Println(goModule.Version)
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}
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return 0, nil
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}
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func cmdListModules() (int, error) {
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for _, m := range caddy.Modules() {
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fmt.Println(m)
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}
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return 0, nil
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}
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func cmdEnviron() (int, error) {
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for _, v := range os.Environ() {
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fmt.Println(v)
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}
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return 0, nil
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}
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