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|
package main
import (
"context"
"fmt"
"log"
"net"
"net/http"
"os"
"os/signal"
"os/user"
"path/filepath"
"strconv"
"sync"
"syscall"
"time"
)
func startServer(
s *Server,
listener net.Listener,
wg *sync.WaitGroup,
sigCtx context.Context,
) {
defer wg.Done()
go func() {
err := s.Serve(listener)
if err != nil && err != http.ErrServerClosed {
log.Fatalf("Failed to start server (%s): %s", s.Label(), err)
}
}()
fmt.Printf("Started server (%s)\n", s.Label())
// Wait until we receive a signal to stop the server.
<-sigCtx.Done()
// Gracefully shutdown the server with timeout.
timeoutCtx, cancelTimeoutCtx := context.WithTimeout(context.Background(), time.Second*10)
defer cancelTimeoutCtx()
s.Shutdown(timeoutCtx)
fmt.Printf("Shutdown server (%s)\n", s.Label())
}
func downgradeToUser(uname string) error {
// Get gid and uid.
u, err := user.Lookup(uname)
if err != nil {
return err
}
// On POSIX system, gid and uid are integers.
gid, err := strconv.Atoi(u.Gid)
if err != nil {
return err
}
uid, err := strconv.Atoi(u.Uid)
if err != nil {
return err
}
// Set gid and uid.
err = syscall.Setgid(gid)
if err != nil {
return err
}
err = syscall.Setuid(uid)
if err != nil {
return err
}
return nil
}
func main() {
// Generate password mode
if len(os.Args) == 3 && os.Args[1] == "-genpw" {
userName := os.Args[2]
fmt.Fprintf(os.Stderr, "Enter password for user %s: ", userName)
password, err := ReadPasswordFromUserInput()
fmt.Fprintln(os.Stderr)
if err != nil {
log.Fatalf("%s", err)
}
passwordHash, err := GeneratePasswordHash(password)
if err != nil {
log.Fatalf("%s", err)
}
fmt.Println(userName + ":" + passwordHash)
return
}
// Check mode
if len(os.Args) == 3 && os.Args[1] == "-check" {
configFileName := os.Args[2]
_, err := LoadConfig(configFileName)
if err != nil {
log.Fatalf("%s", err)
}
return
}
// Load config.
if len(os.Args) < 2 {
log.Fatalf("Usage: %s <config file>", os.Args[0])
}
configFileName := os.Args[1]
config, err := LoadConfig(configFileName)
if err != nil {
log.Fatalf("Failed to load configuration: %s", err)
}
configFileDir := filepath.Dir(configFileName)
// Set up listeners.
var listeners []net.Listener
for _, s := range config.Servers {
l, err := NewListener(&s)
if err != nil {
log.Fatalf("Failed to create listener (%s:%d): %s", s.Host, s.Port, err)
}
listeners = append(listeners, l)
}
// Set up servers.
var servers []*Server
for _, s := range config.Servers {
// Convert relative paths to absolute paths, based on config file location.
if s.ACMEChallenge != nil {
s.ACMEChallenge.Root = filepath.Join(configFileDir, s.ACMEChallenge.Root)
}
if s.TLSCertFile != "" {
s.TLSCertFile = filepath.Join(configFileDir, s.TLSCertFile)
}
if s.TLSKeyFile != "" {
s.TLSKeyFile = filepath.Join(configFileDir, s.TLSKeyFile)
}
for _, p := range s.Proxies {
if p.BasicAuth != nil {
p.BasicAuth.CredentialFile = filepath.Join(configFileDir, p.BasicAuth.CredentialFile)
}
}
server, err := NewServer(&s)
if err != nil {
log.Fatalf("Failed to create server: %s", err)
}
servers = append(servers, server)
}
// Downgrade to non-root user.
if config.User != "" {
err := downgradeToUser(config.User)
if err != nil {
log.Fatalf("Failed to downgrade to user %s: %s", config.User, err)
}
}
// Catch signals to stop servers.
sigCtx, cancelSigCtx := signal.NotifyContext(
context.Background(),
syscall.SIGTERM, os.Interrupt, os.Kill,
)
defer cancelSigCtx()
// Start servers.
var wg sync.WaitGroup
for i, s := range servers {
wg.Add(1)
go startServer(s, listeners[i], &wg, sigCtx)
}
wg.Wait()
}
|
