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minio/cmd/net.go

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9.9 KiB

/*
* 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 (
"context"
"errors"
"fmt"
"net"
"net/url"
"os"
"sort"
"strconv"
"strings"
"syscall"
"time"
humanize "github.com/dustin/go-humanize"
"github.com/minio/minio-go/pkg/set"
"github.com/minio/minio/cmd/logger"
)
// IPv4 addresses of local host.
var localIP4 = mustGetLocalIP4()
// mustSplitHostPort is a wrapper to net.SplitHostPort() where error is assumed to be a fatal.
func mustSplitHostPort(hostPort string) (host, port string) {
host, port, err := net.SplitHostPort(hostPort)
logger.FatalIf(err, "Unable to split host port %s", hostPort)
return host, port
}
// mustGetLocalIP4 returns IPv4 addresses of local host. It panics on error.
func mustGetLocalIP4() (ipList set.StringSet) {
ipList = set.NewStringSet()
addrs, err := net.InterfaceAddrs()
logger.FatalIf(err, "Unable to get IP addresses of this host")
for _, addr := range addrs {
var ip net.IP
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
}
if ip.To4() != nil {
ipList.Add(ip.String())
}
}
return ipList
}
// getHostIP4 returns IPv4 address of given host.
func getHostIP4(host string) (ipList set.StringSet, err error) {
var ips []net.IP
if ips, err = net.LookupIP(host); err != nil {
// return err if not Docker or Kubernetes
// We use IsDocker() method to check for Docker Swarm environment
// as there is no reliable way to clearly identify Swarm from
// Docker environment.
if !IsDocker() && !IsKubernetes() {
return ipList, err
}
// channel to indicate completion of host resolution
doneCh := make(chan struct{})
// Indicate retry routine to exit cleanly, upon this function return.
defer close(doneCh)
// Mark the starting time
startTime := time.Now()
// wait for hosts to resolve in exponentialbackoff manner
for range newRetryTimerSimple(doneCh) {
// Retry infinitely on Kubernetes and Docker swarm.
// This is needed as the remote hosts are sometime
// not available immediately.
if ips, err = net.LookupIP(host); err == nil {
break
}
// time elapsed
timeElapsed := time.Since(startTime)
// log error only if more than 1s elapsed
if timeElapsed > time.Second {
// log the message to console about the host not being
// resolveable.
reqInfo := (&logger.ReqInfo{}).AppendTags("host", host)
reqInfo.AppendTags("elapsedTime", humanize.RelTime(startTime, startTime.Add(timeElapsed), "elapsed", ""))
ctx := logger.SetReqInfo(context.Background(), reqInfo)
logger.LogIf(ctx, err)
}
}
}
ipList = set.NewStringSet()
for _, ip := range ips {
if ip.To4() != nil {
ipList.Add(ip.String())
}
}
return ipList, err
}
// byLastOctetValue implements sort.Interface used in sorting a list
// of ip address by their last octet value in descending order.
type byLastOctetValue []net.IP
func (n byLastOctetValue) Len() int { return len(n) }
func (n byLastOctetValue) Swap(i, j int) { n[i], n[j] = n[j], n[i] }
func (n byLastOctetValue) Less(i, j int) bool {
// This case is needed when all ips in the list
// have same last octets, Following just ensures that
// 127.0.0.1 is moved to the end of the list.
if n[i].String() == "127.0.0.1" {
return false
}
if n[j].String() == "127.0.0.1" {
return true
}
return []byte(n[i].To4())[3] > []byte(n[j].To4())[3]
}
// sortIPs - sort ips based on higher octects.
// The logic to sort by last octet is implemented to
// prefer CIDRs with higher octects, this in-turn skips the
// localhost/loopback address to be not preferred as the
// first ip on the list. Subsequently this list helps us print
// a user friendly message with appropriate values.
func sortIPs(ipList []string) []string {
if len(ipList) == 1 {
return ipList
}
var ipV4s []net.IP
var nonIPs []string
for _, ip := range ipList {
nip := net.ParseIP(ip)
if nip != nil {
ipV4s = append(ipV4s, nip)
} else {
nonIPs = append(nonIPs, ip)
}
}
sort.Sort(byLastOctetValue(ipV4s))
var ips []string
for _, ip := range ipV4s {
ips = append(ips, ip.String())
}
return append(nonIPs, ips...)
}
func getAPIEndpoints(serverAddr string) (apiEndpoints []string) {
host, port := mustSplitHostPort(serverAddr)
var ipList []string
if host == "" {
ipList = sortIPs(localIP4.ToSlice())
} else {
ipList = []string{host}
}
for _, ip := range ipList {
apiEndpoints = append(apiEndpoints, fmt.Sprintf("%s://%s:%s", getURLScheme(globalIsSSL), ip, port))
}
return apiEndpoints
}
// isHostIPv4 - helper for validating if the provided arg is an ip address.
func isHostIPv4(ipAddress string) bool {
host, _, err := net.SplitHostPort(ipAddress)
if err != nil {
host = ipAddress
}
return net.ParseIP(host) != nil
}
// checkPortAvailability - check if given port is already in use.
// Note: The check method tries to listen on given port and closes it.
// It is possible to have a disconnected client in this tiny window of time.
func checkPortAvailability(port string) (err error) {
// Return true if err is "address already in use" error.
isAddrInUseErr := func(err error) (b bool) {
if opErr, ok := err.(*net.OpError); ok {
if sysErr, ok := opErr.Err.(*os.SyscallError); ok {
if errno, ok := sysErr.Err.(syscall.Errno); ok {
b = (errno == syscall.EADDRINUSE)
}
}
}
return b
}
network := []string{"tcp", "tcp4", "tcp6"}
for _, n := range network {
l, err := net.Listen(n, net.JoinHostPort("", port))
if err == nil {
// As we are able to listen on this network, the port is not in use.
// Close the listener and continue check other networks.
if err = l.Close(); err != nil {
return err
}
} else if isAddrInUseErr(err) {
// As we got EADDRINUSE error, the port is in use by other process.
// Return the error.
return err
}
}
return nil
}
// extractHostPort - extracts host/port from many address formats
// such as, ":9000", "localhost:9000", "http://localhost:9000/"
func extractHostPort(hostAddr string) (string, string, error) {
var addr, scheme string
if hostAddr == "" {
return "", "", errors.New("unable to process empty address")
}
// Simplify the work of url.Parse() and always send a url with
if !strings.HasPrefix(hostAddr, "http://") && !strings.HasPrefix(hostAddr, "https://") {
hostAddr = "//" + hostAddr
}
// Parse address to extract host and scheme field
u, err := url.Parse(hostAddr)
if err != nil {
return "", "", err
}
addr = u.Host
scheme = u.Scheme
// Use the given parameter again if url.Parse()
// didn't return any useful result.
if addr == "" {
addr = hostAddr
scheme = "http"
}
// At this point, addr can be one of the following form:
// ":9000"
// "localhost:9000"
// "localhost" <- in this case, we check for scheme
host, port, err := net.SplitHostPort(addr)
if err != nil {
if !strings.Contains(err.Error(), "missing port in address") {
return "", "", err
}
host = addr
switch scheme {
case "https":
port = "443"
case "http":
port = "80"
default:
return "", "", errors.New("unable to guess port from scheme")
}
}
return host, port, nil
}
// isLocalHost - checks if the given parameter
// correspond to one of the local IP of the
// current machine
func isLocalHost(host string) (bool, error) {
hostIPs, err := getHostIP4(host)
if err != nil {
return false, err
}
// If intersection of two IP sets is not empty, then the host is local host.
isLocal := !localIP4.Intersection(hostIPs).IsEmpty()
return isLocal, nil
}
// sameLocalAddrs - returns true if two addresses, even with different
// formats, point to the same machine, e.g:
// ':9000' and 'http://localhost:9000/' will return true
func sameLocalAddrs(addr1, addr2 string) (bool, error) {
// Extract host & port from given parameters
host1, port1, err := extractHostPort(addr1)
if err != nil {
return false, err
}
host2, port2, err := extractHostPort(addr2)
if err != nil {
return false, err
}
var addr1Local, addr2Local bool
if host1 == "" {
// If empty host means it is localhost
addr1Local = true
} else {
// Host not empty, check if it is local
if addr1Local, err = isLocalHost(host1); err != nil {
return false, err
}
}
if host2 == "" {
// If empty host means it is localhost
addr2Local = true
} else {
// Host not empty, check if it is local
if addr2Local, err = isLocalHost(host2); err != nil {
return false, err
}
}
// If both of addresses point to the same machine, check if
// have the same port
if addr1Local && addr2Local {
if port1 == port2 {
return true, nil
}
}
return false, nil
}
// CheckLocalServerAddr - checks if serverAddr is valid and local host.
func CheckLocalServerAddr(serverAddr string) error {
host, port, err := net.SplitHostPort(serverAddr)
if err != nil {
return uiErrInvalidAddressFlag(err)
}
// Check whether port is a valid port number.
p, err := strconv.Atoi(port)
if err != nil {
return uiErrInvalidAddressFlag(err).Msg("invalid port number")
} else if p < 1 || p > 65535 {
return uiErrInvalidAddressFlag(nil).Msg("port number must be between 1 to 65535")
}
// 0.0.0.0 is a wildcard address and refers to local network
// addresses. I.e, 0.0.0.0:9000 like ":9000" refers to port
// 9000 on localhost.
if host != "" && host != net.IPv4zero.String() {
isLocalHost, err := isLocalHost(host)
if err != nil {
return err
}
if !isLocalHost {
return uiErrInvalidAddressFlag(nil).Msg("host in server address should be this server")
}
}
return nil
}