package main

import (
	"errors"
	"fmt"
	"net"
	"os"
	"syscall"
)

var err_not_unixconn = errors.New("Not a unix connection")

func hooks_handle_connection(conn net.Conn) (err error) {
	defer conn.Close()

	unix_conn, ok := conn.(*net.UnixConn)
	if !ok {
		return err_not_unixconn
	}

	fd, err := unix_conn.File()
	if err != nil {
		return err
	}
	defer fd.Close()

	ucred, err := get_ucred(fd)
	if err != nil {
		return err
	}

	pid := ucred.Pid

	_ = pid

	conn.Write([]byte{0})
	fmt.Fprintf(conn, "your PID is %d\n", pid)

	return nil

}

func serve_git_hooks(listener net.Listener) error {
	conn, err := listener.Accept()
	if err != nil {
		return err
	}

	return hooks_handle_connection(conn)

}

func get_ucred(fd *os.File) (*syscall.Ucred, error) {
	ucred, err := syscall.GetsockoptUcred(int(fd.Fd()), syscall.SOL_SOCKET, syscall.SO_PEERCRED)
	if err != nil {
		return nil, fmt.Errorf("failed to get credentials: %v", err)
	}
	return ucred, nil
}

package main

import (
	"flag"
	"net"
	"net/http"

	"go.lindenii.runxiyu.org/lindenii-common/clog"
)

func main() {
	config_path := flag.String(
		"config",
		"/etc/lindenii/forge.scfg",
		"path to configuration file",
	)
	flag.Parse()

	err := load_config(*config_path)
	if err != nil {
		clog.Fatal(1, "Loading configuration: "+err.Error())
	}

	err = deploy_hooks_to_filesystem()
	if err != nil {
		clog.Fatal(1, "Deploying hooks to filesystem: "+err.Error())
	}

	err = load_templates()
	if err != nil {
		clog.Fatal(1, "Loading templates: "+err.Error())
	}

	ssh_listener, err := net.Listen(config.SSH.Net, config.SSH.Addr)
	if err != nil {
		clog.Fatal(1, "Listening SSH: "+err.Error())
	}

	clog.Info("Listening SSH on " + config.SSH.Net + " " + config.SSH.Addr)
	go func() {
		err = serve_ssh(ssh_listener)
		if err != nil {
			clog.Fatal(1, "Serving SSH: "+err.Error())
		}
	}()

	err = serve_ssh(ssh_listener)

	hooks_listener, err := net.Listen("unix", config.Hooks.Socket)

	if err != nil {

		clog.Fatal(1, "Serving SSH: "+err.Error())

		clog.Fatal(1, "Listening hooks: "+err.Error())

	}

	clog.Info("Listening SSH on " + config.SSH.Net + " " + config.SSH.Addr)

	clog.Info("Listening hooks at " + config.Hooks.Socket)
	go func() {
		err = serve_git_hooks(hooks_listener)
		if err != nil {
			clog.Fatal(1, "Serving hooks: "+err.Error())
		}
	}()

	listener, err := net.Listen(config.HTTP.Net, config.HTTP.Addr)
	if err != nil {
		clog.Fatal(1, "Listening HTTP: "+err.Error())
	}
	clog.Info("Listening HTTP on " + config.HTTP.Net + " " + config.HTTP.Addr)

	err = http.Serve(listener, &http_router_t{})
	if err != nil {
		clog.Fatal(1, "Serving HTTP: "+err.Error())
	}

	go func() {
		err = http.Serve(listener, &http_router_t{})
		if err != nil {
			clog.Fatal(1, "Serving HTTP: "+err.Error())
		}
	}()

	select{}

}

package main

import (
	"fmt"
	"net"
	"os"
	"path"
	"strings"

	glider_ssh "github.com/gliderlabs/ssh"
	"go.lindenii.runxiyu.org/lindenii-common/clog"
	go_ssh "golang.org/x/crypto/ssh"
)

var (
	server_public_key_string      string
	server_public_key_fingerprint string
	server_public_key             go_ssh.PublicKey
)

func serve_ssh(listener net.Listener) error {
	host_key_bytes, err := os.ReadFile(config.SSH.Key)
	if err != nil {
		return err
	}

	host_key, err := go_ssh.ParsePrivateKey(host_key_bytes)
	if err != nil {
		return err
	}

	server_public_key = host_key.PublicKey()
	server_public_key_string = string(go_ssh.MarshalAuthorizedKey(server_public_key))
	server_public_key_fingerprint = string(go_ssh.FingerprintSHA256(server_public_key))

	server := &glider_ssh.Server{
		Handler: func(session glider_ssh.Session) {
			client_public_key := session.PublicKey()
			var client_public_key_string string
			if client_public_key != nil {
				client_public_key_string = strings.TrimSuffix(string(go_ssh.MarshalAuthorizedKey(client_public_key)), "\n")
			}

			clog.Info("Incoming SSH: " + session.RemoteAddr().String() + " " + client_public_key_string + " " + session.RawCommand())
			fmt.Fprintln(session.Stderr(), "Lindenii Forge "+VERSION+", source at "+path.Join(config.HTTP.Root, "/:/source/\r"))

			cmd := session.Command()

			if len(cmd) < 2 {
				fmt.Fprintln(session.Stderr(), "Insufficient arguments\r")
				return
			}

			switch cmd[0] {
			case "git-upload-pack":
				if len(cmd) > 2 {
					fmt.Fprintln(session.Stderr(), "Too many arguments\r")
					return
				}
				err = ssh_handle_upload_pack(session, client_public_key_string, cmd[1])
			case "git-receive-pack":
				if len(cmd) > 2 {
					fmt.Fprintln(session.Stderr(), "Too many arguments\r")
					return
				}
				err = ssh_handle_receive_pack(session, client_public_key_string, cmd[1])
			default:
				fmt.Fprintln(session.Stderr(), "Unsupported command: "+cmd[0]+"\r")
				return
			}
			if err != nil {
				fmt.Fprintln(session.Stderr(), err.Error())
				return
			}
		},
		PublicKeyHandler:           func(ctx glider_ssh.Context, key glider_ssh.PublicKey) bool { return true },
		KeyboardInteractiveHandler: func(ctx glider_ssh.Context, challenge go_ssh.KeyboardInteractiveChallenge) bool { return true },
		// It is intentional that we do not check any credentials and accept all connections.
		// This allows all users to connect and clone repositories. However, the public key
		// is passed to handlers, so e.g. the push handler could check the key and reject the
		// push if it needs to.
	}

	server.AddHostKey(host_key)

	go func() {
		err = server.Serve(listener)
		if err != nil {
			clog.Fatal(1, "Serving SSH: "+err.Error())
		}
	}()

	err = server.Serve(listener)
	if err != nil {
		clog.Fatal(1, "Serving SSH: "+err.Error())
	}

	return nil
}