package opts import ( "fmt" "net" "net/url" "strconv" "strings" ) var ( // DefaultHTTPPort Default HTTP Port used if only the protocol is provided to -H flag e.g. docker daemon -H tcp:// // These are the IANA registered port numbers for use with Docker // see http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=docker DefaultHTTPPort = 2375 // Default HTTP Port // DefaultTLSHTTPPort Default HTTP Port used when TLS enabled DefaultTLSHTTPPort = 2376 // Default TLS encrypted HTTP Port // DefaultUnixSocket Path for the unix socket. // Docker daemon by default always listens on the default unix socket DefaultUnixSocket = "/var/run/docker.sock" // DefaultTCPHost constant defines the default host string used by docker on Windows DefaultTCPHost = fmt.Sprintf("tcp://%s:%d", DefaultHTTPHost, DefaultHTTPPort) // DefaultTLSHost constant defines the default host string used by docker for TLS sockets DefaultTLSHost = fmt.Sprintf("tcp://%s:%d", DefaultHTTPHost, DefaultTLSHTTPPort) // DefaultNamedPipe defines the default named pipe used by docker on Windows DefaultNamedPipe = `//./pipe/docker_engine` ) // ValidateHost validates that the specified string is a valid host and returns it. func ValidateHost(val string) (string, error) { host := strings.TrimSpace(val) // The empty string means default and is not handled by parseDockerDaemonHost if host != "" { _, err := parseDockerDaemonHost(host) if err != nil { return val, err } } // Note: unlike most flag validators, we don't return the mutated value here // we need to know what the user entered later (using ParseHost) to adjust for tls return val, nil } // ParseHost and set defaults for a Daemon host string func ParseHost(defaultToTLS bool, val string) (string, error) { host := strings.TrimSpace(val) if host == "" { if defaultToTLS { host = DefaultTLSHost } else { host = DefaultHost } } else { var err error host, err = parseDockerDaemonHost(host) if err != nil { return val, err } } return host, nil } // parseDockerDaemonHost parses the specified address and returns an address that will be used as the host. // Depending of the address specified, this may return one of the global Default* strings defined in hosts.go. func parseDockerDaemonHost(addr string) (string, error) { addrParts := strings.Split(addr, "://") if len(addrParts) == 1 && addrParts[0] != "" { addrParts = []string{"tcp", addrParts[0]} } switch addrParts[0] { case "tcp": return parseTCPAddr(addrParts[1], DefaultTCPHost) case "unix": return parseSimpleProtoAddr("unix", addrParts[1], DefaultUnixSocket) case "npipe": return parseSimpleProtoAddr("npipe", addrParts[1], DefaultNamedPipe) case "fd": return addr, nil default: return "", fmt.Errorf("Invalid bind address format: %s", addr) } } // parseSimpleProtoAddr parses and validates that the specified address is a valid // socket address for simple protocols like unix and npipe. It returns a formatted // socket address, either using the address parsed from addr, or the contents of // defaultAddr if addr is a blank string. func parseSimpleProtoAddr(proto, addr, defaultAddr string) (string, error) { addr = strings.TrimPrefix(addr, proto+"://") if strings.Contains(addr, "://") { return "", fmt.Errorf("Invalid proto, expected %s: %s", proto, addr) } if addr == "" { addr = defaultAddr } return fmt.Sprintf("%s://%s", proto, addr), nil } // parseTCPAddr parses and validates that the specified address is a valid TCP // address. It returns a formatted TCP address, either using the address parsed // from tryAddr, or the contents of defaultAddr if tryAddr is a blank string. // tryAddr is expected to have already been Trim()'d // defaultAddr must be in the full `tcp://host:port` form func parseTCPAddr(tryAddr string, defaultAddr string) (string, error) { if tryAddr == "" || tryAddr == "tcp://" { return defaultAddr, nil } addr := strings.TrimPrefix(tryAddr, "tcp://") if strings.Contains(addr, "://") || addr == "" { return "", fmt.Errorf("Invalid proto, expected tcp: %s", tryAddr) } defaultAddr = strings.TrimPrefix(defaultAddr, "tcp://") defaultHost, defaultPort, err := net.SplitHostPort(defaultAddr) if err != nil { return "", err } // url.Parse fails for trailing colon on IPv6 brackets on Go 1.5, but // not 1.4. See https://github.com/golang/go/issues/12200 and // https://github.com/golang/go/issues/6530. if strings.HasSuffix(addr, "]:") { addr += defaultPort } u, err := url.Parse("tcp://" + addr) if err != nil { return "", err } host, port, err := net.SplitHostPort(u.Host) if err != nil { return "", fmt.Errorf("Invalid bind address format: %s", tryAddr) } if host == "" { host = defaultHost } if port == "" { port = defaultPort } p, err := strconv.Atoi(port) if err != nil && p == 0 { return "", fmt.Errorf("Invalid bind address format: %s", tryAddr) } return fmt.Sprintf("tcp://%s%s", net.JoinHostPort(host, port), u.Path), nil }