abstract gemini package
This commit is contained in:
dre
parent
5d0ae92896
commit
c2cfec67ef
4 changed files with 357 additions and 236 deletions
18
gemini/error.go
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18
gemini/error.go
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@ -0,0 +1,18 @@
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package gemini
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type GmiError struct {
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Code int
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err error
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}
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func Error(code int, err error) error {
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return &GmiError{Code: code, err: err}
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}
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func (e *GmiError) Error() string {
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return e.err.Error()
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}
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func (e *GmiError) Unwrap() error {
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return e.err
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}
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223
gemini/gemini.go
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223
gemini/gemini.go
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@ -0,0 +1,223 @@
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package gemini
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import (
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"bufio"
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"bytes"
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"context"
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"crypto/tls"
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"errors"
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"fmt"
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"io"
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"log"
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"net"
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"net/url"
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"path"
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"strings"
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"time"
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"unicode/utf8"
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)
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const (
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StatusInput = 10
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StatusSensitiveInput = 11
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StatusSuccess = 20
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StatusRedirectTemporary = 30
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StatusRedirectPermanent = 31
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StatusTemporaryFailure = 40
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StatusServerUnavailable = 41
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StatusCgiError = 42
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StatusProxyError = 43
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StatusSlowDown = 44
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StatusPermanentFailure = 50
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StatusNotFound = 51
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StatusGone = 52
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StatusProxyRequestRefused = 53
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StatusBadRequest = 59
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StatusClientCertificateRequired = 60
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StatusCertificateNotAuthorized = 61
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StatusCertificateNotValid = 62
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)
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const (
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Termination = "\r\n"
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URLMaxBytes = 1024
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IndexFile = "index.gmi"
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MimeType = "text/gemini; charset=utf-8"
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)
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var (
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ErrServerClosed = errors.New("gemini: server closed")
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ErrHeaderTooLong = errors.New("gemini: header too long")
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ErrMissingFile = errors.New("gemini: no such file")
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)
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type Request struct {
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ctx context.Context
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URL *url.URL
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}
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type Handler interface {
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ServeGemini(io.Writer, *Request)
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}
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// The HandlerFunc type is an adapter to allow the use of
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// ordinary functions as Gemini handlers. If f is a function
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// with the appropriate signature, HandlerFunc(f) is a
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// Handler that calls f.
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type HandlerFunc func(io.Writer, *Request)
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// ServeGemini calls f(w, r).
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func (f HandlerFunc) ServeGemini(w io.Writer, r *Request) {
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f(w, r)
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}
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type Server struct {
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// Addr is the address the server is listening on.
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Addr string
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// Hostname or common name of the server. This is used for absolute redirects.
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Hostname string
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TLSConfig *tls.Config
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Handler Handler // handler to invoke
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ReadTimeout time.Duration
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MaxOpenConns int
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}
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func (s *Server) ListenAndServe() error {
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// outer for loop, if listener closes we will restart it. This may be useful if we switch out
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// TLSConfig.
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//for {
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listener, err := tls.Listen("tcp", s.Addr, s.TLSConfig)
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if err != nil {
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return fmt.Errorf("gemini server listen: %w", err)
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}
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queue := make(chan net.Conn, s.MaxOpenConns)
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go s.handleConnectionQueue(queue)
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for {
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conn, err := listener.Accept()
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if err != nil {
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log.Printf("server: accept: %s", err)
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break
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}
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queue <- conn
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}
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//}
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return nil
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}
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func (s *Server) handleConnectionQueue(queue chan net.Conn) {
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// semaphore for connection limiter
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type semaphore chan struct{}
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sem := make(semaphore, s.MaxOpenConns)
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for {
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// for each connection we receive
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conn := <-queue
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sem <- struct{}{} // acquire
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go s.handleConnection(conn, sem)
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}
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}
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func (s *Server) handleConnection(conn net.Conn, sem chan struct{}) {
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defer func() {
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conn.Close()
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<-sem // release
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}()
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reqChan := make(chan request)
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// push job for which we allocated a sem slot and wait
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go requestChannel(conn, reqChan)
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select {
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case header := <-reqChan:
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fmt.Println("serve")
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if header.err != nil {
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s.handleRequestError(conn, header)
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return
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}
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ctx := context.Background()
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r := &Request{ctx: ctx, URL: header.URL}
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s.Handler.ServeGemini(conn, r)
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case <-time.After(s.ReadTimeout):
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WriteHeader(conn, StatusServerUnavailable, "")
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}
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}
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func (s *Server) handleRequestError(conn net.Conn, req request) {
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// TODO: log err
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var gmierr *GmiError
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if errors.As(req.err, &gmierr) {
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WriteHeader(conn, gmierr.Code, gmierr.Error())
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return
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}
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// this path doesn't exist currently.
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WriteHeader(conn, StatusTemporaryFailure, "internal")
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}
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// conn handler
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type request struct {
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URL *url.URL
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err error
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}
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func requestChannel(c net.Conn, rsp chan request) {
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u, err := readHeader(c)
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rsp <- request{u, err}
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}
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func readHeader(c net.Conn) (*url.URL, error) {
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req, err := bufio.NewReader(c).ReadString('\r')
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if err != nil {
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return nil, Error(StatusTemporaryFailure, errors.New("error reading request"))
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}
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requestURL := strings.TrimSpace(req)
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if requestURL == "" {
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return nil, Error(StatusBadRequest, errors.New("empty request URL"))
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} else if !utf8.ValidString(requestURL) {
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return nil, Error(StatusBadRequest, errors.New("not a valid utf-8 url"))
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} else if len(requestURL) > URLMaxBytes {
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return nil, Error(StatusBadRequest, ErrHeaderTooLong)
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}
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parsedURL, err := url.Parse(requestURL)
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if err != nil {
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return nil, Error(StatusBadRequest, err)
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}
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if parsedURL.Scheme != "" && parsedURL.Scheme != "gemini" {
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return nil, Error(StatusProxyRequestRefused, fmt.Errorf("unknown protocol scheme %s", parsedURL.Scheme))
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} else if parsedURL.Host == "" {
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return nil, Error(StatusBadRequest, errors.New("empty host"))
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}
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if parsedURL.Path == "" {
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return nil, Error(StatusRedirectPermanent, errors.New("./"+parsedURL.Path))
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} else if parsedURL.Path != path.Clean(parsedURL.Path) {
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return nil, Error(StatusBadRequest, errors.New("path error"))
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}
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return parsedURL, nil
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}
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func (s *Server) Shutdown(ctx context.Context) error {
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return nil
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}
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func WriteHeader(c io.Writer, code int, message string) {
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// <STATUS><SPACE><META><CR><LF>
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var header []byte
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if len(message) == 0 {
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header = []byte(fmt.Sprintf("%d%s", code, Termination))
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}
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header = []byte(fmt.Sprintf("%d %s%s", code, message, Termination))
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c.Write(header)
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}
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func Write(c io.Writer, body []byte) {
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reader := bytes.NewReader(body)
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io.Copy(c, reader)
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}
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22
gemini/tlsconfig.go
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22
gemini/tlsconfig.go
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package gemini
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import (
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"crypto/rand"
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"crypto/tls"
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)
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func TLSConfig(sni string, cert tls.Certificate) *tls.Config {
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return &tls.Config{
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ServerName: sni,
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Certificates: []tls.Certificate{cert},
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Rand: rand.Reader,
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MinVersion: tls.VersionTLS12,
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CurvePreferences: []tls.CurveID{tls.CurveP521, tls.CurveP384, tls.CurveP256},
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PreferServerCipherSuites: true,
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CipherSuites: []uint16{
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tls.TLS_AES_128_GCM_SHA256,
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tls.TLS_CHACHA20_POLY1305_SHA256,
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tls.TLS_AES_256_GCM_SHA384,
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},
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}
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}
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330
main.go
330
main.go
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@ -1,73 +1,44 @@
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package main
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import (
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"bufio"
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"crypto/rand"
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"crypto/tls"
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"errors"
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"flag"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"mime"
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"net"
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"net/url"
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"os"
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"path"
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"strings"
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"time"
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"unicode/utf8"
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"github.com/n0x1m/gmifs/gemini"
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)
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const (
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// Input = 10
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// SensitiveInput = 11
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Success = 20
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RedirectTemporary = 30
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RedirectPermanent = 31
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TemporaryFailure = 40
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ServerUnavailable = 41
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// CgiError = 42
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// ProxyError = 43
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// SlowDown = 44
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// PermanentFailure = 50
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NotFound = 51
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// Gone = 52
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ProxyRequestRefused = 53
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BadRequest = 59
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// ClientCertificateRequired = 60
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// CertificateNotAuthorized = 61
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// CertificateNotValid = 62
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)
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defaultAddress = ":1965"
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defaultMaxConns = 256
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defaultTimeout = 10
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defaultRootPath = "/var/www/htdocs/gemini"
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defaultHost = ""
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defaultCertPath = ""
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defaultKeyPath = ""
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const (
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Termination = "\r\n"
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URLMaxBytes = 1024
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IndexGmi = "index.gmi"
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GeminiMIME = "text/gemini"
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DefaultAddress = ":1965"
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DefaultMaxConns = 256
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DefaultTimeout = 10
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DefaultRootPath = "/var/www/htdocs/gemini"
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DefaultCN = ""
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DefaultCertPath = ""
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DefaultKeyPath = ""
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shutdownTimeout = 10 * time.Second
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)
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func main() {
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var address, root, crt, key, cn string
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var addr, root, crt, key, host string
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var maxconns, timeout int
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flag.StringVar(&address, "address", DefaultAddress, "address to listen on. E.g. 127.0.0.1:1965")
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flag.IntVar(&maxconns, "max-conns", DefaultMaxConns, "maximum number of concurrently open connections")
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flag.IntVar(&timeout, "timeout", DefaultTimeout, "connection timeout in seconds")
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flag.StringVar(&root, "root", DefaultRootPath, "server root directory to serve from")
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flag.StringVar(&cn, "cn", DefaultCN, "x509 Common Name when using temporary self-signed certs")
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flag.StringVar(&crt, "cert", DefaultCertPath, "TLS chain of one or more certificates")
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flag.StringVar(&key, "key", DefaultKeyPath, "TLS private key")
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flag.StringVar(&addr, "addr", defaultAddress, "address to listen on. E.g. 127.0.0.1:1965")
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flag.IntVar(&maxconns, "max-conns", defaultMaxConns, "maximum number of concurrently open connections")
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flag.IntVar(&timeout, "timeout", defaultTimeout, "connection timeout in seconds")
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flag.StringVar(&root, "root", defaultRootPath, "server root directory to serve from")
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flag.StringVar(&host, "host", defaultHost, "hostname / x509 Common Name when using temporary self-signed certs")
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flag.StringVar(&crt, "cert", defaultCertPath, "TLS chain of one or more certificates")
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flag.StringVar(&key, "key", defaultKeyPath, "TLS private key")
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flag.Parse()
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var err error
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@ -78,19 +49,52 @@ func main() {
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if err != nil {
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log.Fatalf("server: loadkeys: %s", err)
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}
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} else if cn != "" {
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} else if host != "" {
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log.Println("generating self-signed temporary certificate")
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cert, err = gemini.GenX509KeyPair(cn)
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cert, err = gemini.GenX509KeyPair(host)
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if err != nil {
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log.Fatalf("server: loadkeys: %s", err)
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}
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} else {
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fmt.Fprintf(os.Stderr, "need either a keypair with cert and key or a common name (hostname)\n")
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}
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if host == "" {
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fmt.Fprintf(os.Stderr, "a keypair with cert and key or at least a common name (hostname) is required for sni\n")
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fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
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flag.PrintDefaults()
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os.Exit(1)
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}
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server := &gemini.Server{
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Addr: addr,
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Hostname: host,
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TLSConfig: gemini.TLSConfig(host, cert),
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Handler: gemini.HandlerFunc(fileserver(root)),
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MaxOpenConns: maxconns,
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ReadTimeout: time.Duration(timeout) * time.Second,
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}
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//confirm := make(chan struct{}, 1)
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//go func() {
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if err := server.ListenAndServe(); err != nil && !errors.Is(err, gemini.ErrServerClosed) {
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log.Fatal("ListenAndServe terminated unexpectedly")
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}
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// close(confirm)
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//}()
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/*
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stop := make(chan os.Signal, 1)
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signal.Notify(stop, os.Interrupt)
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<-stop
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ctx, cancel := context.WithTimeout(context.Background(), shutdownTimeout)
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if err := server.Shutdown(ctx); err != nil {
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cancel()
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log.Fatal("ListenAndServe shutdown")
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}
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<-confirm
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cancel()
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*/
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/*
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hup := make(chan os.Signal, 1)
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signal.Notify(hup, syscall.SIGHUP)
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@ -100,217 +104,71 @@ func main() {
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}
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}()
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*/
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}
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config := &tls.Config{
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Certificates: []tls.Certificate{cert},
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Rand: rand.Reader,
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MinVersion: tls.VersionTLS12,
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CurvePreferences: []tls.CurveID{tls.CurveP521, tls.CurveP384, tls.CurveP256},
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PreferServerCipherSuites: true,
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CipherSuites: []uint16{
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tls.TLS_AES_128_GCM_SHA256,
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tls.TLS_CHACHA20_POLY1305_SHA256,
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tls.TLS_AES_256_GCM_SHA384,
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},
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}
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listener, err := tls.Listen("tcp", address, config)
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if err != nil {
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log.Fatalf("server: listen: %s", err)
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}
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queue := make(chan net.Conn, maxconns)
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go func() {
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type semaphore chan struct{}
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sem := make(semaphore, maxconns)
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for {
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// for each connection we receive
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conn := <-queue
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sem <- struct{}{} // acquire
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go func() {
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defer func() {
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conn.Close()
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<-sem // release
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}()
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handler := make(chan Response)
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go handleConnectionChannel(conn, root, handler)
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select {
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case rsp := <-handler:
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response, err := rsp.res, rsp.err
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var gmierr *GmiError
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if err != nil && errors.As(err, &gmierr) {
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if gmierr.Code == RedirectPermanent || gmierr.Code == RedirectTemporary {
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// error is relative path if redirect
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redirect := "gemini://" + cn + err.Error()
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sendError(conn, gmierr.Code, redirect)
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return
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}
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sendError(conn, gmierr.Code, err.Error())
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return
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}
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sendFile(conn, response.file, response.mimeType)
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response.file.Close()
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case <-time.After(10 * time.Second):
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sendError(conn, ServerUnavailable, "Server Unavailable")
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}
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}()
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}
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}()
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for {
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conn, err := listener.Accept()
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func fileserver(root string) func(w io.Writer, r *gemini.Request) {
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return func(w io.Writer, r *gemini.Request) {
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fullpath, err := fullPath(root, r.URL.Path)
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if err != nil {
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log.Printf("server: accept: %s", err)
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break
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gemini.WriteHeader(w, gemini.StatusNotFound, err.Error())
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return
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}
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queue <- conn
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body, mimeType, err := readFile(fullpath)
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if err != nil {
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gemini.WriteHeader(w, gemini.StatusNotFound, err.Error())
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return
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}
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gemini.WriteHeader(w, gemini.StatusSuccess, mimeType)
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gemini.Write(w, body)
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}
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}
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type Response struct {
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res File
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err error
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}
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func fullPath(root, requestPath string) (string, error) {
|
||||
if requestPath == "/" || requestPath == "." {
|
||||
return path.Join(root, gemini.IndexFile), nil
|
||||
}
|
||||
|
||||
type File struct {
|
||||
file *os.File
|
||||
mimeType string
|
||||
}
|
||||
fullpath := path.Join(root, requestPath)
|
||||
|
||||
type GmiError struct {
|
||||
Code int
|
||||
err error
|
||||
}
|
||||
|
||||
func Error(code int, err error) error {
|
||||
return &GmiError{Code: code, err: err}
|
||||
}
|
||||
|
||||
func (e *GmiError) Error() string {
|
||||
return e.err.Error()
|
||||
}
|
||||
|
||||
func (e *GmiError) Unwrap() error {
|
||||
return e.err
|
||||
}
|
||||
|
||||
func handleConnectionChannel(c net.Conn, root string, rsp chan Response) {
|
||||
result, err := handleConnection(c, root)
|
||||
pathInfo, err := os.Stat(fullpath)
|
||||
if err != nil {
|
||||
rsp <- Response{err: err}
|
||||
return
|
||||
}
|
||||
rsp <- Response{res: *result, err: err}
|
||||
}
|
||||
|
||||
func handleConnection(c net.Conn, root string) (*File, error) {
|
||||
req, err := bufio.NewReader(c).ReadString('\r')
|
||||
if err != nil {
|
||||
return nil, Error(TemporaryFailure, errors.New("error reading request"))
|
||||
}
|
||||
fmt.Printf("%s\n", req)
|
||||
|
||||
requestURL := strings.TrimSpace(req)
|
||||
if requestURL == "" {
|
||||
return nil, Error(BadRequest, errors.New("empty request URL"))
|
||||
} else if !utf8.ValidString(requestURL) {
|
||||
return nil, Error(BadRequest, errors.New("not a valid utf-8 url"))
|
||||
} else if len(requestURL) > URLMaxBytes {
|
||||
return nil, Error(BadRequest, errors.New("url exceeds maximum allowed length"))
|
||||
}
|
||||
|
||||
parsedURL, err := url.Parse(requestURL)
|
||||
if err != nil {
|
||||
return nil, Error(BadRequest, err)
|
||||
}
|
||||
|
||||
if parsedURL.Scheme == "" {
|
||||
parsedURL.Scheme = "gemini"
|
||||
}
|
||||
if parsedURL.Scheme != "gemini" {
|
||||
return nil, Error(ProxyRequestRefused, fmt.Errorf("unknown protocol scheme %s", parsedURL.Scheme))
|
||||
} else if parsedURL.Host == "" {
|
||||
return nil, Error(BadRequest, errors.New("empty host"))
|
||||
}
|
||||
|
||||
_, port, _ := net.SplitHostPort(c.LocalAddr().String())
|
||||
if parsedURL.Port() != "" && parsedURL.Port() != port {
|
||||
return nil, Error(ProxyRequestRefused, errors.New("faulty port"))
|
||||
}
|
||||
|
||||
return handleRequest(c, root, parsedURL)
|
||||
}
|
||||
|
||||
func handleRequest(c net.Conn, root string, parsedURL *url.URL) (*File, error) {
|
||||
if parsedURL.Path == "" {
|
||||
return nil, Error(RedirectPermanent, errors.New(parsedURL.Path))
|
||||
} else if parsedURL.Path != path.Clean(parsedURL.Path) {
|
||||
return nil, Error(BadRequest, errors.New("path error"))
|
||||
}
|
||||
|
||||
if parsedURL.Path == "/" || parsedURL.Path == "." {
|
||||
return serveFile(root, IndexGmi)
|
||||
}
|
||||
return serveFile(root, parsedURL.Path)
|
||||
}
|
||||
|
||||
func serveFile(root, filepath string) (*File, error) {
|
||||
fullPath := path.Join(root, filepath)
|
||||
|
||||
pathInfo, err := os.Stat(fullPath)
|
||||
if err != nil {
|
||||
return nil, Error(NotFound, err)
|
||||
return "", fmt.Errorf("path: %w", err)
|
||||
}
|
||||
|
||||
if pathInfo.IsDir() {
|
||||
subDirIndex := path.Join(fullPath, IndexGmi)
|
||||
subDirIndex := path.Join(fullpath, gemini.IndexFile)
|
||||
if _, err := os.Stat(subDirIndex); os.IsNotExist(err) {
|
||||
return nil, Error(NotFound, err)
|
||||
return "", fmt.Errorf("path: %w", err)
|
||||
}
|
||||
|
||||
fullPath = subDirIndex
|
||||
fullpath = subDirIndex
|
||||
}
|
||||
|
||||
mimeType := getMimeType(fullPath)
|
||||
return fullpath, nil
|
||||
}
|
||||
|
||||
func readFile(filepath string) ([]byte, string, error) {
|
||||
mimeType := getMimeType(filepath)
|
||||
if mimeType == "" {
|
||||
return nil, Error(NotFound, errors.New("unsupported"))
|
||||
return nil, "", errors.New("unsupported")
|
||||
}
|
||||
|
||||
file, err := os.Open(fullPath)
|
||||
file, err := os.Open(filepath)
|
||||
if err != nil {
|
||||
return nil, Error(NotFound, err)
|
||||
return nil, "", fmt.Errorf("file: %w", err)
|
||||
}
|
||||
|
||||
return &File{file: file, mimeType: mimeType}, nil
|
||||
}
|
||||
|
||||
func sendError(c net.Conn, code int, message string) {
|
||||
c.Write(header(code, message))
|
||||
}
|
||||
|
||||
func sendFile(c net.Conn, file *os.File, mimeType string) {
|
||||
if file != nil {
|
||||
c.Write(header(Success, mimeType))
|
||||
io.Copy(c, file)
|
||||
return
|
||||
defer file.Close()
|
||||
data, err := ioutil.ReadAll(file)
|
||||
if err != nil {
|
||||
return nil, "", fmt.Errorf("read: %w", err)
|
||||
}
|
||||
sendError(c, TemporaryFailure, "file handler failed")
|
||||
return data, mimeType, nil
|
||||
}
|
||||
|
||||
func header(code int, message string) []byte {
|
||||
// <STATUS><SPACE><META><CR><LF>
|
||||
if len(message) == 0 {
|
||||
return []byte(fmt.Sprintf("%d%s", code, Termination))
|
||||
}
|
||||
return []byte(fmt.Sprintf("%d %s%s", code, message, Termination))
|
||||
}
|
||||
|
||||
func getMimeType(fullPath string) string {
|
||||
if ext := path.Ext(fullPath); ext != ".gmi" {
|
||||
func getMimeType(fullpath string) string {
|
||||
if ext := path.Ext(fullpath); ext != ".gmi" {
|
||||
return mime.TypeByExtension(ext)
|
||||
}
|
||||
return GeminiMIME
|
||||
return gemini.MimeType
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue