336 lines
8.2 KiB
Go
336 lines
8.2 KiB
Go
/*
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* Minio Cloud Storage, (C) 2017 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"errors"
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"fmt"
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"net"
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"net/url"
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"os"
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"sort"
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"strconv"
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"strings"
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"syscall"
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"github.com/minio/minio-go/pkg/set"
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)
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// IPv4 addresses of local host.
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var localIP4 = mustGetLocalIP4()
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// mustSplitHostPort is a wrapper to net.SplitHostPort() where error is assumed to be a fatal.
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func mustSplitHostPort(hostPort string) (host, port string) {
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host, port, err := net.SplitHostPort(hostPort)
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fatalIf(err, "Unable to split host port %s", hostPort)
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return host, port
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}
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// mustGetLocalIP4 returns IPv4 addresses of local host. It panics on error.
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func mustGetLocalIP4() (ipList set.StringSet) {
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ipList = set.NewStringSet()
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addrs, err := net.InterfaceAddrs()
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fatalIf(err, "Unable to get IP addresses of this host.")
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for _, addr := range addrs {
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var ip net.IP
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switch v := addr.(type) {
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case *net.IPNet:
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ip = v.IP
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case *net.IPAddr:
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ip = v.IP
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}
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if ip.To4() != nil {
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ipList.Add(ip.String())
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}
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}
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return ipList
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}
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// getHostIP4 returns IPv4 address of given host.
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func getHostIP4(host string) (ipList set.StringSet, err error) {
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ipList = set.NewStringSet()
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ips, err := net.LookupIP(host)
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if err != nil {
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return ipList, err
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}
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for _, ip := range ips {
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if ip.To4() != nil {
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ipList.Add(ip.String())
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}
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}
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return ipList, err
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}
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// byLastOctetValue implements sort.Interface used in sorting a list
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// of ip address by their last octet value in descending order.
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type byLastOctetValue []net.IP
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func (n byLastOctetValue) Len() int { return len(n) }
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func (n byLastOctetValue) Swap(i, j int) { n[i], n[j] = n[j], n[i] }
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func (n byLastOctetValue) Less(i, j int) bool {
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// This case is needed when all ips in the list
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// have same last octets, Following just ensures that
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// 127.0.0.1 is moved to the end of the list.
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if n[i].String() == "127.0.0.1" {
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return false
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}
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if n[j].String() == "127.0.0.1" {
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return true
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}
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return []byte(n[i].To4())[3] > []byte(n[j].To4())[3]
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}
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// sortIPs - sort ips based on higher octects.
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// The logic to sort by last octet is implemented to
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// prefer CIDRs with higher octects, this in-turn skips the
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// localhost/loopback address to be not preferred as the
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// first ip on the list. Subsequently this list helps us print
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// a user friendly message with appropriate values.
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func sortIPs(ipList []string) []string {
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if len(ipList) == 1 {
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return ipList
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}
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var ipV4s []net.IP
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var nonIPs []string
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for _, ip := range ipList {
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nip := net.ParseIP(ip)
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if nip != nil {
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ipV4s = append(ipV4s, nip)
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} else {
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nonIPs = append(nonIPs, ip)
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}
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}
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sort.Sort(byLastOctetValue(ipV4s))
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var ips []string
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for _, ip := range ipV4s {
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ips = append(ips, ip.String())
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}
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return append(nonIPs, ips...)
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}
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func getAPIEndpoints(serverAddr string) (apiEndpoints []string) {
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host, port := mustSplitHostPort(serverAddr)
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var ipList []string
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if host == "" {
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ipList = sortIPs(localIP4.ToSlice())
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} else {
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ipList = []string{host}
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}
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scheme := httpScheme
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if globalIsSSL {
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scheme = httpsScheme
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}
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for _, ip := range ipList {
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apiEndpoints = append(apiEndpoints, fmt.Sprintf("%s://%s:%s", scheme, ip, port))
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}
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return apiEndpoints
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}
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// checkPortAvailability - check if given port is already in use.
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// Note: The check method tries to listen on given port and closes it.
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// It is possible to have a disconnected client in this tiny window of time.
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func checkPortAvailability(port string) (err error) {
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// Return true if err is "address already in use" error.
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isAddrInUseErr := func(err error) (b bool) {
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if opErr, ok := err.(*net.OpError); ok {
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if sysErr, ok := opErr.Err.(*os.SyscallError); ok {
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if errno, ok := sysErr.Err.(syscall.Errno); ok {
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b = (errno == syscall.EADDRINUSE)
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}
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}
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}
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return b
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}
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network := []string{"tcp", "tcp4", "tcp6"}
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for _, n := range network {
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l, err := net.Listen(n, net.JoinHostPort("", port))
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if err == nil {
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// As we are able to listen on this network, the port is not in use.
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// Close the listener and continue check other networks.
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if err = l.Close(); err != nil {
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return err
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}
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} else if isAddrInUseErr(err) {
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// As we got EADDRINUSE error, the port is in use by other process.
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// Return the error.
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return err
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}
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}
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return nil
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}
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// extractHostPort - extracts host/port from many address formats
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// such as, ":9000", "localhost:9000", "http://localhost:9000/"
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func extractHostPort(hostAddr string) (string, string, error) {
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var addr, scheme string
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if hostAddr == "" {
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return "", "", errors.New("unable to process empty address")
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}
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// Parse address to extract host and scheme field
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u, err := url.Parse(hostAddr)
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if err != nil {
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// Ignore scheme not present error
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if !strings.Contains(err.Error(), "missing protocol scheme") {
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return "", "", err
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}
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} else {
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addr = u.Host
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scheme = u.Scheme
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}
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// Use the given parameter again if url.Parse()
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// didn't return any useful result.
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if addr == "" {
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addr = hostAddr
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scheme = "http"
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}
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// At this point, addr can be one of the following form:
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// ":9000"
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// "localhost:9000"
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// "localhost" <- in this case, we check for scheme
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host, port, err := net.SplitHostPort(addr)
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if err != nil {
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if !strings.Contains(err.Error(), "missing port in address") {
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return "", "", err
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}
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host = addr
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switch scheme {
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case "https":
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port = "443"
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case "http":
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port = "80"
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default:
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return "", "", errors.New("unable to guess port from scheme")
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}
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}
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return host, port, nil
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}
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// isLocalHost - checks if the given parameter
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// correspond to one of the local IP of the
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// current machine
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func isLocalHost(host string) (bool, error) {
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hostIPs, err := getHostIP4(host)
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if err != nil {
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return false, err
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}
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// If intersection of two IP sets is not empty, then the host is local host.
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isLocal := !localIP4.Intersection(hostIPs).IsEmpty()
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return isLocal, nil
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}
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// sameLocalAddrs - returns true if two addresses, even with different
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// formats, point to the same machine, e.g:
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// ':9000' and 'http://localhost:9000/' will return true
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func sameLocalAddrs(addr1, addr2 string) (bool, error) {
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// Extract host & port from given parameters
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host1, port1, err := extractHostPort(addr1)
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if err != nil {
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return false, err
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}
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host2, port2, err := extractHostPort(addr2)
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if err != nil {
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return false, err
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}
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var addr1Local, addr2Local bool
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if host1 == "" {
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// If empty host means it is localhost
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addr1Local = true
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} else {
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// Host not empty, check if it is local
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if addr1Local, err = isLocalHost(host1); err != nil {
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return false, err
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}
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}
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if host2 == "" {
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// If empty host means it is localhost
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addr2Local = true
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} else {
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// Host not empty, check if it is local
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if addr2Local, err = isLocalHost(host2); err != nil {
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return false, err
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}
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}
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// If both of addresses point to the same machine, check if
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// have the same port
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if addr1Local && addr2Local {
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if port1 == port2 {
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return true, nil
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}
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}
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return false, nil
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}
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// CheckLocalServerAddr - checks if serverAddr is valid and local host.
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func CheckLocalServerAddr(serverAddr string) error {
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host, port, err := net.SplitHostPort(serverAddr)
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if err != nil {
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return err
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}
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// Check whether port is a valid port number.
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p, err := strconv.Atoi(port)
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if err != nil {
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return fmt.Errorf("invalid port number")
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} else if p < 1 || p > 65535 {
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return fmt.Errorf("port number must be between 1 to 65535")
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}
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// 0.0.0.0 is a wildcard address and refers to local network
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// addresses. I.e, 0.0.0.0:9000 like ":9000" refers to port
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// 9000 on localhost.
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if host != "" && host != net.IPv4zero.String() {
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isLocalHost, err := isLocalHost(host)
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if err != nil {
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return err
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}
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if !isLocalHost {
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return fmt.Errorf("host in server address should be this server")
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}
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}
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return nil
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}
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