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/*
* MinIO Cloud Storage, (C) 2017-2019 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 (
"context"
"fmt"
"net"
"net/url"
"path"
"path/filepath"
"runtime"
"strconv"
"strings"
"time"
humanize "github.com/dustin/go-humanize"
"github.com/minio/minio-go/v6/pkg/set"
"github.com/minio/minio/cmd/config"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/env"
"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
retryInterval = 5 // In Seconds.
)
// 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
}
// HTTPS - returns true if secure for URLEndpointType.
func (endpoint Endpoint) HTTPS() bool {
return endpoint.Scheme == "https"
}
// UpdateIsLocal - resolves the host and updates if it is local or not.
func (endpoint *Endpoint) UpdateIsLocal() (err error) {
if !endpoint.IsLocal {
endpoint.IsLocal, err = isLocalHost(endpoint.Hostname(), endpoint.Port(), globalMinioPort)
if err != nil {
return err
}
}
return nil
}
// 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 == SlashSeparator || path == `\`
}
if isEmptyPath(arg) {
return ep, fmt.Errorf("empty or root endpoint is not supported")
}
var isLocal bool
var host string
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 && u.RawQuery == "" && u.Fragment == "") {
return ep, fmt.Errorf("invalid URL endpoint format")
}
var 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: %w", 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 i := strings.Index(host, "%"); i > -1 {
host = host[:i]
}
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 SlashSeparator will cause problems, if the
// command line already has C:/<export-folder/ in it. Final resulting
// path on windows might become C:/C:/ this will cause problems
// of starting minio server properly in distributed mode on windows.
// As a special case make sure to trim the separator.
// NOTE: It is also perfectly fine for windows users to have a path
// without C:/ since at that point we treat it as relative path
// and obtain the full filesystem path as well. Providing C:/
// style is necessary to provide paths other than C:/,
// such as F:/, D:/ etc.
//
// Another additional benefit here is that this style also
// supports providing \\host\share support as well.
if runtime.GOOS == globalWindowsOSName {
if filepath.VolumeName(u.Path[1:]) != "" {
u.Path = u.Path[1:]
}
}
} else {
// Only check if the arg is an ip address and ask for scheme since its absent.
// localhost, example.com, any FQDN cannot be disambiguated from a regular file path such as
// /mnt/export1. So we go ahead and start the minio server in FS modes in these cases.
if isHostIP(arg) {
return ep, fmt.Errorf("invalid URL endpoint format: missing scheme http or https")
}
u = &url.URL{Path: path.Clean(arg)}
isLocal = true
}
return Endpoint{
URL: u,
IsLocal: isLocal,
}, nil
}
// ZoneEndpoints represent endpoints in a given zone
// along with its setCount and drivesPerSet.
type ZoneEndpoints struct {
SetCount int
DrivesPerSet int
Endpoints Endpoints
}
// EndpointZones - list of list of endpoints
type EndpointZones []ZoneEndpoints
// Add add zone endpoints
func (l *EndpointZones) Add(zeps ZoneEndpoints) error {
existSet := set.NewStringSet()
for _, zep := range *l {
for _, ep := range zep.Endpoints {
existSet.Add(ep.String())
}
}
// Validate if there are duplicate endpoints across zones
for _, ep := range zeps.Endpoints {
if existSet.Contains(ep.String()) {
return fmt.Errorf("duplicate endpoints found")
}
}
*l = append(*l, zeps)
return nil
}
// FirstLocal returns true if the first endpoint is local.
func (l EndpointZones) FirstLocal() bool {
return l[0].Endpoints[0].IsLocal
}
// HTTPS - returns true if secure for URLEndpointType.
func (l EndpointZones) HTTPS() bool {
return l[0].Endpoints.HTTPS()
}
// Nodes - returns all nodes count
func (l EndpointZones) Nodes() (count int) {
for _, ep := range l {
count += len(ep.Endpoints)
}
return count
}
// Endpoints - list of same type of endpoint.
type Endpoints []Endpoint
// HTTPS - returns true if secure for URLEndpointType.
func (endpoints Endpoints) HTTPS() bool {
return endpoints[0].HTTPS()
}
// GetString - returns endpoint string of i-th endpoint (0-based),
// and empty string for invalid indexes.
func (endpoints Endpoints) GetString(i int) string {
if i < 0 || i >= len(endpoints) {
return ""
}
return endpoints[i].String()
}
func hostResolveToLocalhost(endpoint Endpoint) bool {
hostIPs, err := getHostIP(endpoint.Hostname())
if err != nil {
// Log the message to console about the host resolving
reqInfo := (&logger.ReqInfo{}).AppendTags(
"host",
endpoint.Hostname(),
)
ctx := logger.SetReqInfo(context.Background(), reqInfo)
logger.LogIf(ctx, err, logger.Application)
return false
}
var loopback int
for _, hostIP := range hostIPs.ToSlice() {
if net.ParseIP(hostIP).IsLoopback() {
loopback++
}
}
return loopback == len(hostIPs)
}
func (endpoints Endpoints) atleastOneEndpointLocal() bool {
for _, endpoint := range endpoints {
if endpoint.IsLocal {
return true
}
}
return false
}
// UpdateIsLocal - resolves the host and discovers the local host.
func (endpoints Endpoints) UpdateIsLocal(foundPrevLocal bool) error {
orchestrated := IsDocker() || IsKubernetes()
k8sReplicaSet := IsKubernetesReplicaSet()
var epsResolved int
var foundLocal bool
resolvedList := make([]bool, len(endpoints))
// Mark the starting time
startTime := time.Now()
keepAliveTicker := time.NewTicker(retryInterval * time.Second)
defer keepAliveTicker.Stop()
for {
// Break if the local endpoint is found already Or all the endpoints are resolved.
if foundLocal || (epsResolved == len(endpoints)) {
break
}
// Retry infinitely on Kubernetes and Docker swarm.
// This is needed as the remote hosts are sometime
// not available immediately.
select {
case <-globalOSSignalCh:
return fmt.Errorf("The endpoint resolution got interrupted")
default:
for i, resolved := range resolvedList {
if resolved {
// Continue if host is already resolved.
continue
}
// Log the message to console about the host resolving
reqInfo := (&logger.ReqInfo{}).AppendTags(
"host",
endpoints[i].Hostname(),
)
if k8sReplicaSet && hostResolveToLocalhost(endpoints[i]) {
err := fmt.Errorf("host %s resolves to 127.*, DNS incorrectly configured retrying",
endpoints[i])
// time elapsed
timeElapsed := time.Since(startTime)
// log error only if more than 1s elapsed
if timeElapsed > time.Second {
reqInfo.AppendTags("elapsedTime",
humanize.RelTime(startTime,
startTime.Add(timeElapsed),
"elapsed",
""))
ctx := logger.SetReqInfo(context.Background(), reqInfo)
logger.LogIf(ctx, err, logger.Application)
}
continue
}
// return err if not Docker or Kubernetes
// We use IsDocker() to check for Docker environment
// We use IsKubernetes() to check for Kubernetes environment
isLocal, err := isLocalHost(endpoints[i].Hostname(),
endpoints[i].Port(),
globalMinioPort,
)
if err != nil && !orchestrated {
return err
}
if err != nil {
// time elapsed
timeElapsed := time.Since(startTime)
// log error only if more than 1s elapsed
if timeElapsed > time.Second {
reqInfo.AppendTags("elapsedTime",
humanize.RelTime(startTime,
startTime.Add(timeElapsed),
"elapsed",
"",
))
ctx := logger.SetReqInfo(context.Background(),
reqInfo)
logger.LogIf(ctx, err, logger.Application)
}
} else {
resolvedList[i] = true
endpoints[i].IsLocal = isLocal
if k8sReplicaSet && !endpoints.atleastOneEndpointLocal() && !foundPrevLocal {
// In replicated set in k8s deployment, IPs might
// get resolved for older IPs, add this code
// to ensure that we wait for this server to
// participate atleast one disk and be local.
//
// In special cases for replica set with expanded
// zone setups we need to make sure to provide
// value of foundPrevLocal from zone1 if we already
// found a local setup. Only if we haven't found
// previous local we continue to wait to look for
// atleast one local.
resolvedList[i] = false
// time elapsed
err := fmt.Errorf("no endpoint is local to this host: %s", endpoints[i])
timeElapsed := time.Since(startTime)
// log error only if more than 1s elapsed
if timeElapsed > time.Second {
reqInfo.AppendTags("elapsedTime",
humanize.RelTime(startTime,
startTime.Add(timeElapsed),
"elapsed",
"",
))
ctx := logger.SetReqInfo(context.Background(),
reqInfo)
logger.LogIf(ctx, err, logger.Application)
}
continue
}
epsResolved++
if !foundLocal {
foundLocal = isLocal
}
}
}
// Wait for the tick, if the there exist a local endpoint in discovery.
// Non docker/kubernetes environment we do not need to wait.
if !foundLocal && orchestrated {
<-keepAliveTicker.C
}
}
}
// On Kubernetes/Docker setups DNS resolves inappropriately sometimes
// where there are situations same endpoints with multiple disks
// come online indicating either one of them is local and some
// of them are not local. This situation can never happen and
// its only a possibility in orchestrated deployments with dynamic
// DNS. Following code ensures that we treat if one of the endpoint
// says its local for a given host - it is true for all endpoints
// for the same host. Following code ensures that this assumption
// is true and it works in all scenarios and it is safe to assume
// for a given host.
endpointLocalMap := make(map[string]bool)
for _, ep := range endpoints {
if ep.IsLocal {
endpointLocalMap[ep.Host] = ep.IsLocal
}
}
for i := range endpoints {
endpoints[i].IsLocal = endpointLocalMap[endpoints[i].Host]
}
return nil
}
// NewEndpoints - returns new endpoint list based on input args.
func NewEndpoints(args ...string) (endpoints Endpoints, err error) {
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)
}
return endpoints, nil
}
// Checks if there are any cross device mounts.
func checkCrossDeviceMounts(endpoints Endpoints) (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, foundLocal bool, args ...[]string) (Endpoints, SetupType, error) {
var endpoints Endpoints
var setupType SetupType
var err error
// Check whether serverAddr is valid for this host.
if err = CheckLocalServerAddr(serverAddr); err != nil {
return endpoints, setupType, err
}
_, serverAddrPort := mustSplitHostPort(serverAddr)
// For single arg, return FS setup.
if len(args) == 1 && len(args[0]) == 1 {
var endpoint Endpoint
endpoint, err = NewEndpoint(args[0][0])
if err != nil {
return endpoints, setupType, err
}
if err := endpoint.UpdateIsLocal(); err != nil {
return endpoints, setupType, err
}
if endpoint.Type() != PathEndpointType {
return endpoints, setupType, config.ErrInvalidFSEndpoint(nil).Msg("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 endpoints, setupType, config.ErrInvalidFSEndpoint(nil).Msg(err.Error())
}
return endpoints, setupType, nil
}
for _, iargs := range args {
// Convert args to endpoints
eps, err := NewEndpoints(iargs...)
if err != nil {
return endpoints, setupType, config.ErrInvalidErasureEndpoints(nil).Msg(err.Error())
}
// Check for cross device mounts if any.
if err = checkCrossDeviceMounts(eps); err != nil {
return endpoints, setupType, config.ErrInvalidErasureEndpoints(nil).Msg(err.Error())
}
endpoints = append(endpoints, eps...)
}
if len(endpoints) == 0 {
return endpoints, setupType, config.ErrInvalidErasureEndpoints(nil).Msg("invalid number of endpoints")
}
// Return XL setup when all endpoints are path style.
if endpoints[0].Type() == PathEndpointType {
setupType = XLSetupType
return endpoints, setupType, nil
}
if err = endpoints.UpdateIsLocal(foundLocal); err != nil {
return endpoints, setupType, config.ErrInvalidErasureEndpoints(nil).Msg(err.Error())
}
// Here all endpoints are URL style.
endpointPathSet := set.NewStringSet()
localEndpointCount := 0
localServerHostSet := set.NewStringSet()
localPortSet := set.NewStringSet()
for _, endpoint := range endpoints {
endpointPathSet.Add(endpoint.Path)
if endpoint.IsLocal {
localServerHostSet.Add(endpoint.Hostname())
var port string
_, port, err = net.SplitHostPort(endpoint.Host)
if err != nil {
port = serverAddrPort
}
localPortSet.Add(port)
localEndpointCount++
}
}
// Check whether same path is not used in endpoints of a host on different port.
{
pathIPMap := make(map[string]set.StringSet)
for _, endpoint := range endpoints {
host := endpoint.Hostname()
hostIPSet, _ := getHostIP(host)
if IPSet, ok := pathIPMap[endpoint.Path]; ok {
if !IPSet.Intersection(hostIPSet).IsEmpty() {
return endpoints, setupType,
config.ErrInvalidErasureEndpoints(nil).Msg(fmt.Sprintf("path '%s' can not be served by different port on same address", endpoint.Path))
}
pathIPMap[endpoint.Path] = IPSet.Union(hostIPSet)
} else {
pathIPMap[endpoint.Path] = hostIPSet
}
}
}
// Check whether same path is used for more than 1 local endpoints.
{
localPathSet := set.CreateStringSet()
for _, endpoint := range endpoints {
if !endpoint.IsLocal {
continue
}
if localPathSet.Contains(endpoint.Path) {
return endpoints, setupType,
config.ErrInvalidErasureEndpoints(nil).Msg(fmt.Sprintf("path '%s' cannot be served by different address on same server", endpoint.Path))
}
localPathSet.Add(endpoint.Path)
}
}
// All endpoints are pointing to local host
if len(endpoints) == localEndpointCount {
// If all endpoints have same port number, Just treat it as distXL setup
// using URL style endpoints.
if len(localPortSet) == 1 {
if len(localServerHostSet) > 1 {
return endpoints, setupType,
config.ErrInvalidErasureEndpoints(nil).Msg("all local endpoints should not have different hostnames/ips")
}
return endpoints, DistXLSetupType, nil
}
// Even though all endpoints are local, but those endpoints use different ports.
// This means it is DistXL setup.
}
// 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
}
}
uniqueArgs := set.NewStringSet()
for _, endpoint := range endpoints {
uniqueArgs.Add(endpoint.Host)
}
// Error out if we have less than 2 unique servers.
if len(uniqueArgs.ToSlice()) < 2 && setupType == DistXLSetupType {
err := fmt.Errorf("Unsupported number of endpoints (%s), minimum number of servers cannot be less than 2 in distributed setup", endpoints)
return endpoints, setupType, err
}
publicIPs := env.Get(config.EnvPublicIPs, "")
if len(publicIPs) == 0 {
updateDomainIPs(uniqueArgs)
}
setupType = DistXLSetupType
return 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(endpointZones EndpointZones) (localPeer string) {
peerSet := set.NewStringSet()
for _, ep := range endpointZones {
for _, endpoint := range ep.Endpoints {
if endpoint.Type() != URLEndpointType {
continue
}
if endpoint.IsLocal && endpoint.Host != "" {
peerSet.Add(endpoint.Host)
}
}
}
if peerSet.IsEmpty() {
// Local peer can be empty in FS or Erasure coded mode.
// If so, return globalMinioHost + globalMinioPort value.
if globalMinioHost != "" {
return net.JoinHostPort(globalMinioHost, globalMinioPort)
}
return net.JoinHostPort("127.0.0.1", globalMinioPort)
}
return peerSet.ToSlice()[0]
}
// GetRemotePeers - get hosts information other than this minio service.
func GetRemotePeers(endpointZones EndpointZones) []string {
peerSet := set.NewStringSet()
for _, ep := range endpointZones {
for _, endpoint := range ep.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()
}
func updateDomainIPs(endPoints set.StringSet) {
ipList := set.NewStringSet()
for e := range endPoints {
host, port, err := net.SplitHostPort(e)
if err != nil {
if strings.Contains(err.Error(), "missing port in address") {
host = e
port = globalMinioPort
} else {
continue
}
}
if net.ParseIP(host) == nil {
IPs, err := getHostIP(host)
if err != nil {
continue
}
IPsWithPort := IPs.ApplyFunc(func(ip string) string {
return net.JoinHostPort(ip, port)
})
ipList = ipList.Union(IPsWithPort)
}
ipList.Add(net.JoinHostPort(host, port))
}
globalDomainIPs = ipList.FuncMatch(func(ip string, matchString string) bool {
host, _, err := net.SplitHostPort(ip)
if err != nil {
host = ip
}
return !net.ParseIP(host).IsLoopback() && host != "localhost"
}, "")
}