diff options
Diffstat (limited to 'modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go')
| -rw-r--r-- | modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go | 342 |
1 files changed, 342 insertions, 0 deletions
diff --git a/modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go b/modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go new file mode 100644 index 0000000..32f094b --- /dev/null +++ b/modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go @@ -0,0 +1,342 @@ +// Copyright 2015 Matthew Holt and The Caddy Authors +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package fastcgi + +import ( + "context" + "crypto/tls" + "fmt" + "net/http" + "path" + "path/filepath" + "strconv" + "strings" + "time" + + "github.com/caddyserver/caddy/v2/modules/caddytls" + + "github.com/caddyserver/caddy/v2" +) + +func init() { + caddy.RegisterModule(Transport{}) +} + +type Transport struct { + ////////////////////////////// + // TODO: taken from v1 Handler type + + SoftwareName string + SoftwareVersion string + ServerName string + ServerPort string + + ////////////////////////// + // TODO: taken from v1 Rule type + + // The base path to match. Required. + // Path string + + // upstream load balancer + // balancer + + // Always process files with this extension with fastcgi. + // Ext string + + // Use this directory as the fastcgi root directory. Defaults to the root + // directory of the parent virtual host. + Root string + + // The path in the URL will be split into two, with the first piece ending + // with the value of SplitPath. The first piece will be assumed as the + // actual resource (CGI script) name, and the second piece will be set to + // PATH_INFO for the CGI script to use. + SplitPath string + + // If the URL ends with '/' (which indicates a directory), these index + // files will be tried instead. + IndexFiles []string + + // Environment Variables + EnvVars [][2]string + + // Ignored paths + IgnoredSubPaths []string + + // The duration used to set a deadline when connecting to an upstream. + DialTimeout time.Duration + + // The duration used to set a deadline when reading from the FastCGI server. + ReadTimeout time.Duration + + // The duration used to set a deadline when sending to the FastCGI server. + WriteTimeout time.Duration +} + +// CaddyModule returns the Caddy module information. +func (Transport) CaddyModule() caddy.ModuleInfo { + return caddy.ModuleInfo{ + Name: "http.handlers.reverse_proxy.transport.fastcgi", + New: func() caddy.Module { return new(Transport) }, + } +} + +func (t Transport) RoundTrip(r *http.Request) (*http.Response, error) { + // Create environment for CGI script + env, err := t.buildEnv(r) + if err != nil { + return nil, fmt.Errorf("building environment: %v", err) + } + + // TODO: + // Connect to FastCGI gateway + // address, err := f.Address() + // if err != nil { + // return http.StatusBadGateway, err + // } + // network, address := parseAddress(address) + network, address := "tcp", r.URL.Host // TODO: + + ctx := context.Background() + if t.DialTimeout > 0 { + var cancel context.CancelFunc + ctx, cancel = context.WithTimeout(ctx, t.DialTimeout) + defer cancel() + } + + fcgiBackend, err := DialContext(ctx, network, address) + if err != nil { + return nil, fmt.Errorf("dialing backend: %v", err) + } + // fcgiBackend is closed when response body is closed (see clientCloser) + + // read/write timeouts + if err := fcgiBackend.SetReadTimeout(t.ReadTimeout); err != nil { + return nil, fmt.Errorf("setting read timeout: %v", err) + } + if err := fcgiBackend.SetWriteTimeout(t.WriteTimeout); err != nil { + return nil, fmt.Errorf("setting write timeout: %v", err) + } + + var resp *http.Response + + var contentLength int64 + // if ContentLength is already set + if r.ContentLength > 0 { + contentLength = r.ContentLength + } else { + contentLength, _ = strconv.ParseInt(r.Header.Get("Content-Length"), 10, 64) + } + switch r.Method { + case "HEAD": + resp, err = fcgiBackend.Head(env) + case "GET": + resp, err = fcgiBackend.Get(env, r.Body, contentLength) + case "OPTIONS": + resp, err = fcgiBackend.Options(env) + default: + resp, err = fcgiBackend.Post(env, r.Method, r.Header.Get("Content-Type"), r.Body, contentLength) + } + + // TODO: + return resp, err + + // Stuff brought over from v1 that might not be necessary here: + + // if resp != nil && resp.Body != nil { + // defer resp.Body.Close() + // } + + // if err != nil { + // if err, ok := err.(net.Error); ok && err.Timeout() { + // return http.StatusGatewayTimeout, err + // } else if err != io.EOF { + // return http.StatusBadGateway, err + // } + // } + + // // Write response header + // writeHeader(w, resp) + + // // Write the response body + // _, err = io.Copy(w, resp.Body) + // if err != nil { + // return http.StatusBadGateway, err + // } + + // // Log any stderr output from upstream + // if fcgiBackend.stderr.Len() != 0 { + // // Remove trailing newline, error logger already does this. + // err = LogError(strings.TrimSuffix(fcgiBackend.stderr.String(), "\n")) + // } + + // // Normally we would return the status code if it is an error status (>= 400), + // // however, upstream FastCGI apps don't know about our contract and have + // // probably already written an error page. So we just return 0, indicating + // // that the response body is already written. However, we do return any + // // error value so it can be logged. + // // Note that the proxy middleware works the same way, returning status=0. + // return 0, err +} + +// buildEnv returns a set of CGI environment variables for the request. +func (t Transport) buildEnv(r *http.Request) (map[string]string, error) { + var env map[string]string + + // Separate remote IP and port; more lenient than net.SplitHostPort + var ip, port string + if idx := strings.LastIndex(r.RemoteAddr, ":"); idx > -1 { + ip = r.RemoteAddr[:idx] + port = r.RemoteAddr[idx+1:] + } else { + ip = r.RemoteAddr + } + + // Remove [] from IPv6 addresses + ip = strings.Replace(ip, "[", "", 1) + ip = strings.Replace(ip, "]", "", 1) + + // TODO: respect index files? or leave that to matcher/rewrite (I prefer that)? + fpath := r.URL.Path + + // Split path in preparation for env variables. + // Previous canSplit checks ensure this can never be -1. + // TODO: I haven't brought over canSplit; make sure this doesn't break + splitPos := t.splitPos(fpath) + + // Request has the extension; path was split successfully + docURI := fpath[:splitPos+len(t.SplitPath)] + pathInfo := fpath[splitPos+len(t.SplitPath):] + scriptName := fpath + + // Strip PATH_INFO from SCRIPT_NAME + scriptName = strings.TrimSuffix(scriptName, pathInfo) + + // SCRIPT_FILENAME is the absolute path of SCRIPT_NAME + scriptFilename := filepath.Join(t.Root, scriptName) + + // Add vhost path prefix to scriptName. Otherwise, some PHP software will + // have difficulty discovering its URL. + pathPrefix, _ := r.Context().Value(caddy.CtxKey("path_prefix")).(string) + scriptName = path.Join(pathPrefix, scriptName) + + // TODO: Disabled for now + // // Get the request URI from context. The context stores the original URI in case + // // it was changed by a middleware such as rewrite. By default, we pass the + // // original URI in as the value of REQUEST_URI (the user can overwrite this + // // if desired). Most PHP apps seem to want the original URI. Besides, this is + // // how nginx defaults: http://stackoverflow.com/a/12485156/1048862 + // reqURL, _ := r.Context().Value(httpserver.OriginalURLCtxKey).(url.URL) + + // // Retrieve name of remote user that was set by some downstream middleware such as basicauth. + // remoteUser, _ := r.Context().Value(httpserver.RemoteUserCtxKey).(string) + + requestScheme := "http" + if r.TLS != nil { + requestScheme = "https" + } + + // Some variables are unused but cleared explicitly to prevent + // the parent environment from interfering. + env = map[string]string{ + // Variables defined in CGI 1.1 spec + "AUTH_TYPE": "", // Not used + "CONTENT_LENGTH": r.Header.Get("Content-Length"), + "CONTENT_TYPE": r.Header.Get("Content-Type"), + "GATEWAY_INTERFACE": "CGI/1.1", + "PATH_INFO": pathInfo, + "QUERY_STRING": r.URL.RawQuery, + "REMOTE_ADDR": ip, + "REMOTE_HOST": ip, // For speed, remote host lookups disabled + "REMOTE_PORT": port, + "REMOTE_IDENT": "", // Not used + // "REMOTE_USER": remoteUser, // TODO: + "REQUEST_METHOD": r.Method, + "REQUEST_SCHEME": requestScheme, + "SERVER_NAME": t.ServerName, + "SERVER_PORT": t.ServerPort, + "SERVER_PROTOCOL": r.Proto, + "SERVER_SOFTWARE": t.SoftwareName + "/" + t.SoftwareVersion, + + // Other variables + // "DOCUMENT_ROOT": rule.Root, + "DOCUMENT_URI": docURI, + "HTTP_HOST": r.Host, // added here, since not always part of headers + // "REQUEST_URI": reqURL.RequestURI(), // TODO: + "SCRIPT_FILENAME": scriptFilename, + "SCRIPT_NAME": scriptName, + } + + // compliance with the CGI specification requires that + // PATH_TRANSLATED should only exist if PATH_INFO is defined. + // Info: https://www.ietf.org/rfc/rfc3875 Page 14 + if env["PATH_INFO"] != "" { + env["PATH_TRANSLATED"] = filepath.Join(t.Root, pathInfo) // Info: http://www.oreilly.com/openbook/cgi/ch02_04.html + } + + // Some web apps rely on knowing HTTPS or not + if r.TLS != nil { + env["HTTPS"] = "on" + // and pass the protocol details in a manner compatible with apache's mod_ssl + // (which is why these have a SSL_ prefix and not TLS_). + v, ok := tlsProtocolStrings[r.TLS.Version] + if ok { + env["SSL_PROTOCOL"] = v + } + // and pass the cipher suite in a manner compatible with apache's mod_ssl + for k, v := range caddytls.SupportedCipherSuites { + if v == r.TLS.CipherSuite { + env["SSL_CIPHER"] = k + break + } + } + } + + // Add env variables from config (with support for placeholders in values) + repl := r.Context().Value(caddy.ReplacerCtxKey).(caddy.Replacer) + for _, envVar := range t.EnvVars { + env[envVar[0]] = repl.ReplaceAll(envVar[1], "") + } + + // Add all HTTP headers to env variables + for field, val := range r.Header { + header := strings.ToUpper(field) + header = headerNameReplacer.Replace(header) + env["HTTP_"+header] = strings.Join(val, ", ") + } + return env, nil +} + +// splitPos returns the index where path should +// be split based on t.SplitPath. +func (t Transport) splitPos(path string) int { + // TODO: + // if httpserver.CaseSensitivePath { + // return strings.Index(path, r.SplitPath) + // } + return strings.Index(strings.ToLower(path), strings.ToLower(t.SplitPath)) +} + +// TODO: +// Map of supported protocols to Apache ssl_mod format +// Note that these are slightly different from SupportedProtocols in caddytls/config.go +var tlsProtocolStrings = map[uint16]string{ + tls.VersionTLS10: "TLSv1", + tls.VersionTLS11: "TLSv1.1", + tls.VersionTLS12: "TLSv1.2", + tls.VersionTLS13: "TLSv1.3", +} + +var headerNameReplacer = strings.NewReplacer(" ", "_", "-", "_") |