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package main
import (
"context"
"fmt"
"log/slog"
"net/http"
"os"
"os/signal"
"os/user"
"time"
"github.com/LMBishop/gunnel/api/handlers"
"github.com/LMBishop/gunnel/pkg/config"
"github.com/LMBishop/gunnel/pkg/store"
"github.com/LMBishop/gunnel/pkg/wireguard"
"github.com/go-co-op/gocron/v2"
"github.com/gorilla/mux"
)
func main() {
u, err := user.Current()
if err != nil {
slog.Warn("cannot verify user is root", "error", err)
} else if u.Uid != "0" {
slog.Error("this program must be run as root to manage WireGuard")
os.Exit(1)
}
_, err = os.Stat("/usr/share/dict/words")
if err != nil {
slog.Error("could not find dictionary file at /usr/share/dict/words (you need to install a wordlist first)", "error", err)
os.Exit(1)
}
if err := run(); err != nil {
slog.Error("Unhandled error", "error", err)
os.Exit(1)
}
}
func run() error {
configService := config.NewService()
err := configService.InitialiseConfig("/etc/gunnel/config.yaml", "config.yaml")
if err != nil {
return fmt.Errorf("failed to load config: %w", err)
}
wireguardService := wireguard.NewService()
storeService := store.NewService()
c := configService.Config()
public, err := wireguardService.Up(c.WireGuard.InterfaceName, c.WireGuard.Network, c.WireGuard.Port)
if err != nil {
return fmt.Errorf("could not bring WireGuard interface up: %w", err)
}
slog.Info("interface up", "interface", c.WireGuard.InterfaceName, "publickey", public)
r := mux.NewRouter()
r.Host(c.Hostname).PathPrefix("/{port:[0-9]+}").HandlerFunc(handlers.NewPeer(storeService, wireguardService, configService))
r.Host(c.Hostname).Path("/").HandlerFunc(handlers.Index(configService))
r.Host(fmt.Sprintf("{subdomain}.%s", c.Hostname)).HandlerFunc(handlers.ReverseProxy(storeService))
srv := make([]*http.Server, 1)
if c.TLS.Enabled {
srv[0] = startHttpsServer(r, c.TLS.Cert, c.TLS.Key)
srv = append(srv, startHttpRedirect())
} else {
srv[0] = startHttpServer(r)
}
slog.Info("server started", "hostname", c.Hostname, "tls", c.TLS.Enabled)
s, err := gocron.NewScheduler()
if err != nil {
return fmt.Errorf("could not create scheduler: %w", err)
}
// todo fix (and move to service)
_, err = s.NewJob(gocron.CronJob("0 * * * *", false), gocron.NewTask(func() {
unusedRules := storeService.GetUnusedRulesSince(time.Now().Add(-time.Duration(c.ExpireAfter)))
if len(unusedRules) == 0 {
return
}
slog.Info("removing unused tunnels", "count", len(unusedRules))
for _, rule := range unusedRules {
wireguardService.RemovePeer(rule.Peer)
storeService.RemoveForwardingRule(rule.Slug)
}
}),
)
channel := make(chan os.Signal, 1)
signal.Notify(channel, os.Interrupt)
<-channel
err = s.Shutdown()
if err != nil {
slog.Error("scheduler shutdown", "error", err)
}
ctx, cancel := context.WithTimeout(context.Background(), time.Second*15)
defer cancel()
for _, s := range srv {
if err := s.Shutdown(ctx); err != nil {
slog.Error("server shutdown", "error", err)
}
}
err = wireguardService.Down()
if err != nil {
return fmt.Errorf("could not bring WireGuard interface down %w", err)
}
slog.Info("interface down", "interface", c.WireGuard.InterfaceName)
return nil
}
func startHttpServer(router *mux.Router) *http.Server {
srv := &http.Server{
Handler: router,
Addr: ":80",
WriteTimeout: 15 * time.Second,
ReadTimeout: 15 * time.Second,
}
go func() {
if err := srv.ListenAndServe(); err != nil {
slog.Error("http server", "error", err)
}
}()
return srv
}
func startHttpsServer(router *mux.Router, cert string, key string) *http.Server {
srv := &http.Server{
Handler: router,
Addr: ":443",
WriteTimeout: 15 * time.Second,
ReadTimeout: 15 * time.Second,
}
go func() {
if err := srv.ListenAndServeTLS(cert, key); err != nil {
slog.Error("https server", "error", err)
}
}()
return srv
}
func startHttpRedirect() *http.Server {
srv := &http.Server{
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, "https://"+r.Host+r.URL.String(), http.StatusMovedPermanently)
}),
Addr: ":80",
WriteTimeout: 15 * time.Second,
ReadTimeout: 15 * time.Second,
}
go func() {
if err := srv.ListenAndServe(); err != nil {
slog.Error("http redirect server", "error", err)
}
}()
return srv
}
|
