platform_test.go

     1  // Copyright 2015 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package net
     6  
     7  import (
     8  	"internal/testenv"
     9  	"os"
    10  	"os/exec"
    11  	"runtime"
    12  	"strconv"
    13  	"strings"
    14  	"testing"
    15  )
    16  
    17  var unixEnabledOnAIX bool
    18  
    19  func init() {
    20  	if runtime.GOOS == "aix" {
    21  		// Unix network isn't properly working on AIX 7.2 with
    22  		// Technical Level < 2.
    23  		// The information is retrieved only once in this init()
    24  		// instead of everytime testableNetwork is called.
    25  		out, _ := exec.Command("oslevel", "-s").Output()
    26  		if len(out) >= len("7200-XX-ZZ-YYMM") { // AIX 7.2, Tech Level XX, Service Pack ZZ, date YYMM
    27  			aixVer := string(out[:4])
    28  			tl, _ := strconv.Atoi(string(out[5:7]))
    29  			unixEnabledOnAIX = aixVer > "7200" || (aixVer == "7200" && tl >= 2)
    30  		}
    31  	}
    32  }
    33  
    34  // testableNetwork reports whether network is testable on the current
    35  // platform configuration.
    36  func testableNetwork(network string) bool {
    37  	net, _, _ := strings.Cut(network, ":")
    38  	switch net {
    39  	case "ip+nopriv":
    40  	case "ip", "ip4", "ip6":
    41  		switch runtime.GOOS {
    42  		case "plan9":
    43  			return false
    44  		default:
    45  			if os.Getuid() != 0 {
    46  				return false
    47  			}
    48  		}
    49  	case "unix", "unixgram":
    50  		switch runtime.GOOS {
    51  		case "android", "plan9", "windows":
    52  			return false
    53  		case "aix":
    54  			return unixEnabledOnAIX
    55  		}
    56  		// iOS does not support unix, unixgram.
    57  		if iOS() {
    58  			return false
    59  		}
    60  	case "unixpacket":
    61  		switch runtime.GOOS {
    62  		case "aix", "android", "darwin", "ios", "plan9", "windows":
    63  			return false
    64  		case "netbsd":
    65  			// It passes on amd64 at least. 386 fails (Issue 22927). arm is unknown.
    66  			if runtime.GOARCH == "386" {
    67  				return false
    68  			}
    69  		}
    70  	}
    71  	switch net {
    72  	case "tcp4", "udp4", "ip4":
    73  		if !supportsIPv4() {
    74  			return false
    75  		}
    76  	case "tcp6", "udp6", "ip6":
    77  		if !supportsIPv6() {
    78  			return false
    79  		}
    80  	}
    81  	return true
    82  }
    83  
    84  func iOS() bool {
    85  	return runtime.GOOS == "ios"
    86  }
    87  
    88  // testableAddress reports whether address of network is testable on
    89  // the current platform configuration.
    90  func testableAddress(network, address string) bool {
    91  	switch net, _, _ := strings.Cut(network, ":"); net {
    92  	case "unix", "unixgram", "unixpacket":
    93  		// Abstract unix domain sockets, a Linux-ism.
    94  		if address[0] == '@' && runtime.GOOS != "linux" {
    95  			return false
    96  		}
    97  	}
    98  	return true
    99  }
   100  
   101  // testableListenArgs reports whether arguments are testable on the
   102  // current platform configuration.
   103  func testableListenArgs(network, address, client string) bool {
   104  	if !testableNetwork(network) || !testableAddress(network, address) {
   105  		return false
   106  	}
   107  
   108  	var err error
   109  	var addr Addr
   110  	switch net, _, _ := strings.Cut(network, ":"); net {
   111  	case "tcp", "tcp4", "tcp6":
   112  		addr, err = ResolveTCPAddr("tcp", address)
   113  	case "udp", "udp4", "udp6":
   114  		addr, err = ResolveUDPAddr("udp", address)
   115  	case "ip", "ip4", "ip6":
   116  		addr, err = ResolveIPAddr("ip", address)
   117  	default:
   118  		return true
   119  	}
   120  	if err != nil {
   121  		return false
   122  	}
   123  	var ip IP
   124  	var wildcard bool
   125  	switch addr := addr.(type) {
   126  	case *TCPAddr:
   127  		ip = addr.IP
   128  		wildcard = addr.isWildcard()
   129  	case *UDPAddr:
   130  		ip = addr.IP
   131  		wildcard = addr.isWildcard()
   132  	case *IPAddr:
   133  		ip = addr.IP
   134  		wildcard = addr.isWildcard()
   135  	}
   136  
   137  	// Test wildcard IP addresses.
   138  	if wildcard && !testenv.HasExternalNetwork() {
   139  		return false
   140  	}
   141  
   142  	// Test functionality of IPv4 communication using AF_INET and
   143  	// IPv6 communication using AF_INET6 sockets.
   144  	if !supportsIPv4() && ip.To4() != nil {
   145  		return false
   146  	}
   147  	if !supportsIPv6() && ip.To16() != nil && ip.To4() == nil {
   148  		return false
   149  	}
   150  	cip := ParseIP(client)
   151  	if cip != nil {
   152  		if !supportsIPv4() && cip.To4() != nil {
   153  			return false
   154  		}
   155  		if !supportsIPv6() && cip.To16() != nil && cip.To4() == nil {
   156  			return false
   157  		}
   158  	}
   159  
   160  	// Test functionality of IPv4 communication using AF_INET6
   161  	// sockets.
   162  	if !supportsIPv4map() && supportsIPv4() && (network == "tcp" || network == "udp" || network == "ip") && wildcard {
   163  		// At this point, we prefer IPv4 when ip is nil.
   164  		// See favoriteAddrFamily for further information.
   165  		if ip.To16() != nil && ip.To4() == nil && cip.To4() != nil { // a pair of IPv6 server and IPv4 client
   166  			return false
   167  		}
   168  		if (ip.To4() != nil || ip == nil) && cip.To16() != nil && cip.To4() == nil { // a pair of IPv4 server and IPv6 client
   169  			return false
   170  		}
   171  	}
   172  
   173  	return true
   174  }
   175  
   176  func condFatalf(t *testing.T, network string, format string, args ...any) {
   177  	t.Helper()
   178  	// A few APIs like File and Read/WriteMsg{UDP,IP} are not
   179  	// fully implemented yet on Plan 9 and Windows.
   180  	switch runtime.GOOS {
   181  	case "windows":
   182  		if network == "file+net" {
   183  			t.Logf(format, args...)
   184  			return
   185  		}
   186  	case "plan9":
   187  		t.Logf(format, args...)
   188  		return
   189  	}
   190  	t.Fatalf(format, args...)
   191  }
   192
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