/* * Minio Cloud Storage, (C) 2017 Minio, Inc. * * 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 cmd import ( "fmt" "net" "net/url" "path" "path/filepath" "runtime" "sort" "strconv" "strings" "github.com/minio/minio-go/pkg/set" "github.com/minio/minio/pkg/mountinfo" ) // EndpointType - enum for endpoint type. type EndpointType int const ( // PathEndpointType - path style endpoint type enum. PathEndpointType EndpointType = iota + 1 // URLEndpointType - URL style endpoint type enum. URLEndpointType ) // Endpoint - any type of endpoint. type Endpoint struct { *url.URL IsLocal bool } func (endpoint Endpoint) String() string { if endpoint.Host == "" { return endpoint.Path } return endpoint.URL.String() } // Type - returns type of endpoint. func (endpoint Endpoint) Type() EndpointType { if endpoint.Host == "" { return PathEndpointType } return URLEndpointType } // IsHTTPS - returns true if secure for URLEndpointType. func (endpoint Endpoint) IsHTTPS() bool { return endpoint.Scheme == "https" } // NewEndpoint - returns new endpoint based on given arguments. func NewEndpoint(arg string) (ep Endpoint, e error) { // isEmptyPath - check whether given path is not empty. isEmptyPath := func(path string) bool { return path == "" || path == "/" || path == `\` } if isEmptyPath(arg) { return ep, fmt.Errorf("empty or root endpoint is not supported") } var isLocal bool u, err := url.Parse(arg) if err == nil && u.Host != "" { // URL style of endpoint. // Valid URL style endpoint is // - Scheme field must contain "http" or "https" // - All field should be empty except Host and Path. if !((u.Scheme == "http" || u.Scheme == "https") && u.User == nil && u.Opaque == "" && u.ForceQuery == false && u.RawQuery == "" && u.Fragment == "") { return ep, fmt.Errorf("invalid URL endpoint format") } var host, port string host, port, err = net.SplitHostPort(u.Host) if err != nil { if !strings.Contains(err.Error(), "missing port in address") { return ep, fmt.Errorf("invalid URL endpoint format: %s", err) } host = u.Host } else { var p int p, err = strconv.Atoi(port) if err != nil { return ep, fmt.Errorf("invalid URL endpoint format: invalid port number") } else if p < 1 || p > 65535 { return ep, fmt.Errorf("invalid URL endpoint format: port number must be between 1 to 65535") } } if host == "" { return ep, fmt.Errorf("invalid URL endpoint format: empty host name") } // As this is path in the URL, we should use path package, not filepath package. // On MS Windows, filepath.Clean() converts into Windows path style ie `/foo` becomes `\foo` u.Path = path.Clean(u.Path) if isEmptyPath(u.Path) { return ep, fmt.Errorf("empty or root path is not supported in URL endpoint") } // On windows having a preceding "/" will cause problems, if the // command line already has C:/= len(endpoints) { return "" } return endpoints[i].String() } // NewEndpointList - returns new endpoint list based on input args. func NewEndpointList(args ...string) (endpoints EndpointList, err error) { // isValidDistribution - checks whether given count is a valid distribution for erasure coding. isValidDistribution := func(count int) bool { return (count >= minErasureBlocks && count <= maxErasureBlocks && count%2 == 0) } // Check whether no. of args are valid for XL distribution. if !isValidDistribution(len(args)) { return nil, fmt.Errorf("A total of %d endpoints were found. For erasure mode it should be an even number between %d and %d", len(args), minErasureBlocks, maxErasureBlocks) } var endpointType EndpointType var scheme string uniqueArgs := set.NewStringSet() // Loop through args and adds to endpoint list. for i, arg := range args { endpoint, err := NewEndpoint(arg) if err != nil { return nil, fmt.Errorf("'%s': %s", arg, err.Error()) } // All endpoints have to be same type and scheme if applicable. if i == 0 { endpointType = endpoint.Type() scheme = endpoint.Scheme } else if endpoint.Type() != endpointType { return nil, fmt.Errorf("mixed style endpoints are not supported") } else if endpoint.Scheme != scheme { return nil, fmt.Errorf("mixed scheme is not supported") } arg = endpoint.String() if uniqueArgs.Contains(arg) { return nil, fmt.Errorf("duplicate endpoints found") } uniqueArgs.Add(arg) endpoints = append(endpoints, endpoint) } sort.Sort(endpoints) return endpoints, nil } // Checks if there are any cross device mounts. func checkCrossDeviceMounts(endpoints EndpointList) (err error) { var absPaths []string for _, endpoint := range endpoints { if endpoint.IsLocal { var absPath string absPath, err = filepath.Abs(endpoint.Path) if err != nil { return err } absPaths = append(absPaths, absPath) } } return mountinfo.CheckCrossDevice(absPaths) } // CreateEndpoints - validates and creates new endpoints for given args. func CreateEndpoints(serverAddr string, args ...string) (string, EndpointList, SetupType, error) { var endpoints EndpointList var setupType SetupType var err error // Check whether serverAddr is valid for this host. if err = CheckLocalServerAddr(serverAddr); err != nil { return serverAddr, endpoints, setupType, err } _, serverAddrPort := mustSplitHostPort(serverAddr) // For single arg, return FS setup. if len(args) == 1 { var endpoint Endpoint endpoint, err = NewEndpoint(args[0]) if err != nil { return serverAddr, endpoints, setupType, err } if endpoint.Type() != PathEndpointType { return serverAddr, endpoints, setupType, fmt.Errorf("use path style endpoint for FS setup") } endpoints = append(endpoints, endpoint) setupType = FSSetupType // Check for cross device mounts if any. if err = checkCrossDeviceMounts(endpoints); err != nil { return serverAddr, endpoints, setupType, err } return serverAddr, endpoints, setupType, nil } // Convert args to endpoints if endpoints, err = NewEndpointList(args...); err != nil { return serverAddr, endpoints, setupType, err } // Check for cross device mounts if any. if err = checkCrossDeviceMounts(endpoints); err != nil { return serverAddr, endpoints, setupType, err } // Return XL setup when all endpoints are path style. if endpoints[0].Type() == PathEndpointType { setupType = XLSetupType return serverAddr, endpoints, setupType, nil } // Here all endpoints are URL style. endpointPathSet := set.NewStringSet() localEndpointCount := 0 localServerAddrSet := set.NewStringSet() localPortSet := set.NewStringSet() for _, endpoint := range endpoints { endpointPathSet.Add(endpoint.Path) if endpoint.IsLocal { localServerAddrSet.Add(endpoint.Host) var port string _, port, err = net.SplitHostPort(endpoint.Host) if err != nil { port = serverAddrPort } localPortSet.Add(port) localEndpointCount++ } } // No local endpoint found. if localEndpointCount == 0 { return serverAddr, endpoints, setupType, fmt.Errorf("no endpoint found for this host") } // Check whether same path is not used in endpoints of a host. { pathIPMap := make(map[string]set.StringSet) for _, endpoint := range endpoints { var host string host, _, err = net.SplitHostPort(endpoint.Host) if err != nil { host = endpoint.Host } hostIPSet, _ := getHostIP4(host) if IPSet, ok := pathIPMap[endpoint.Path]; ok { if !IPSet.Intersection(hostIPSet).IsEmpty() { err = fmt.Errorf("path '%s' can not be served by different port on same address", endpoint.Path) return serverAddr, endpoints, setupType, err } pathIPMap[endpoint.Path] = IPSet.Union(hostIPSet) } else { pathIPMap[endpoint.Path] = hostIPSet } } } // Check whether serverAddrPort matches at least in one of port used in local endpoints. { if !localPortSet.Contains(serverAddrPort) { if len(localPortSet) > 1 { err = fmt.Errorf("port number in server address must match with one of the port in local endpoints") } else { err = fmt.Errorf("server address and local endpoint have different ports") } return serverAddr, endpoints, setupType, err } } // All endpoints are pointing to local host if len(endpoints) == localEndpointCount { // If all endpoints have same port number, then this is XL setup using URL style endpoints. if len(localPortSet) == 1 { if len(localServerAddrSet) > 1 { // TODO: Eventhough all endpoints are local, the local host is referred by different IP/name. // eg '172.0.0.1', 'localhost' and 'mylocalhostname' point to same local host. // // In this case, we bind to 0.0.0.0 ie to all interfaces. // The actual way to do is bind to only IPs in uniqueLocalHosts. serverAddr = net.JoinHostPort("", serverAddrPort) } endpointPaths := endpointPathSet.ToSlice() endpoints, _ = NewEndpointList(endpointPaths...) setupType = XLSetupType return serverAddr, endpoints, setupType, nil } // Eventhough all endpoints are local, but those endpoints use different ports. // This means it is DistXL setup. } else { // This is DistXL setup. // Check whether local server address are not 127.x.x.x for _, localServerAddr := range localServerAddrSet.ToSlice() { host, _, err := net.SplitHostPort(localServerAddr) if err != nil { host = localServerAddr } ipList, err := getHostIP4(host) fatalIf(err, "unexpected error when resolving host '%s'", host) // Filter ipList by IPs those start with '127.'. loopBackIPs := ipList.FuncMatch(func(ip string, matchString string) bool { return strings.HasPrefix(ip, "127.") }, "") // If loop back IP is found and ipList contains only loop back IPs, then error out. if len(loopBackIPs) > 0 && len(loopBackIPs) == len(ipList) { err = fmt.Errorf("'%s' resolves to loopback address is not allowed for distributed XL", localServerAddr) return serverAddr, endpoints, setupType, err } } } // Add missing port in all endpoints. for i := range endpoints { _, port, err := net.SplitHostPort(endpoints[i].Host) if err != nil { endpoints[i].Host = net.JoinHostPort(endpoints[i].Host, serverAddrPort) } else if endpoints[i].IsLocal && serverAddrPort != port { // If endpoint is local, but port is different than serverAddrPort, then make it as remote. endpoints[i].IsLocal = false } } setupType = DistXLSetupType return serverAddr, endpoints, setupType, nil } // GetLocalPeer - returns local peer value, returns globalMinioAddr // for FS and Erasure mode. In case of distributed server return // the first element from the set of peers which indicate that // they are local. There is always one entry that is local // even with repeated server endpoints. func GetLocalPeer(endpoints EndpointList) (localPeer string) { peerSet := set.NewStringSet() for _, endpoint := range endpoints { if endpoint.Type() != URLEndpointType { continue } if endpoint.IsLocal && endpoint.Host != "" { peerSet.Add(endpoint.Host) } } if peerSet.IsEmpty() { // If local peer is empty can happen in FS or Erasure coded mode. // then set the value to globalMinioAddr instead. return globalMinioAddr } return peerSet.ToSlice()[0] } // GetRemotePeers - get hosts information other than this minio service. func GetRemotePeers(endpoints EndpointList) []string { peerSet := set.NewStringSet() for _, endpoint := range endpoints { if endpoint.Type() != URLEndpointType { continue } peer := endpoint.Host if endpoint.IsLocal { if _, port := mustSplitHostPort(peer); port == globalMinioPort { continue } } peerSet.Add(peer) } return peerSet.ToSlice() }