file_wasip1_test.go

     1  // Copyright 2023 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  //go:build wasip1
     6  
     7  package net
     8  
     9  import (
    10  	"syscall"
    11  	"testing"
    12  )
    13  
    14  // The tests in this file intend to validate the ability for net.FileConn and
    15  // net.FileListener to handle both TCP and UDP sockets. Ideally we would test
    16  // the public interface by constructing an *os.File from a file descriptor
    17  // opened on a socket, but the WASI preview 1 specification is too limited to
    18  // support this approach for UDP sockets. Instead, we test the internals that
    19  // make it possible for WASI host runtimes and guest programs to integrate
    20  // socket extensions with the net package using net.FileConn/net.FileListener.
    21  //
    22  // Note that the creation of net.Conn and net.Listener values for TCP sockets
    23  // has an end-to-end test in src/runtime/internal/wasitest, here we are only
    24  // verifying the code paths specific to UDP, and error handling for invalid use
    25  // of the functions.
    26  
    27  func TestWasip1FileConnNet(t *testing.T) {
    28  	tests := []struct {
    29  		filetype syscall.Filetype
    30  		network  string
    31  		error    error
    32  	}{
    33  		{syscall.FILETYPE_SOCKET_STREAM, "tcp", nil},
    34  		{syscall.FILETYPE_SOCKET_DGRAM, "udp", nil},
    35  		{syscall.FILETYPE_BLOCK_DEVICE, "", syscall.ENOTSOCK},
    36  		{syscall.FILETYPE_CHARACTER_DEVICE, "", syscall.ENOTSOCK},
    37  		{syscall.FILETYPE_DIRECTORY, "", syscall.ENOTSOCK},
    38  		{syscall.FILETYPE_REGULAR_FILE, "", syscall.ENOTSOCK},
    39  		{syscall.FILETYPE_SYMBOLIC_LINK, "", syscall.ENOTSOCK},
    40  		{syscall.FILETYPE_UNKNOWN, "", syscall.ENOTSOCK},
    41  	}
    42  	for _, test := range tests {
    43  		net, err := fileConnNet(test.filetype)
    44  		if net != test.network {
    45  			t.Errorf("fileConnNet: network mismatch: want=%q got=%q", test.network, net)
    46  		}
    47  		if err != test.error {
    48  			t.Errorf("fileConnNet: error mismatch: want=%v got=%v", test.error, err)
    49  		}
    50  	}
    51  }
    52  
    53  func TestWasip1FileListenNet(t *testing.T) {
    54  	tests := []struct {
    55  		filetype syscall.Filetype
    56  		network  string
    57  		error    error
    58  	}{
    59  		{syscall.FILETYPE_SOCKET_STREAM, "tcp", nil},
    60  		{syscall.FILETYPE_SOCKET_DGRAM, "", syscall.EOPNOTSUPP},
    61  		{syscall.FILETYPE_BLOCK_DEVICE, "", syscall.ENOTSOCK},
    62  		{syscall.FILETYPE_CHARACTER_DEVICE, "", syscall.ENOTSOCK},
    63  		{syscall.FILETYPE_DIRECTORY, "", syscall.ENOTSOCK},
    64  		{syscall.FILETYPE_REGULAR_FILE, "", syscall.ENOTSOCK},
    65  		{syscall.FILETYPE_SYMBOLIC_LINK, "", syscall.ENOTSOCK},
    66  		{syscall.FILETYPE_UNKNOWN, "", syscall.ENOTSOCK},
    67  	}
    68  	for _, test := range tests {
    69  		net, err := fileListenNet(test.filetype)
    70  		if net != test.network {
    71  			t.Errorf("fileListenNet: network mismatch: want=%q got=%q", test.network, net)
    72  		}
    73  		if err != test.error {
    74  			t.Errorf("fileListenNet: error mismatch: want=%v got=%v", test.error, err)
    75  		}
    76  	}
    77  }
    78  
    79  func TestWasip1NewFileListener(t *testing.T) {
    80  	if l, ok := newFileListener(newFD("tcp", -1)).(*TCPListener); !ok {
    81  		t.Errorf("newFileListener: tcp listener type mismatch: %T", l)
    82  	} else {
    83  		testIsTCPAddr(t, "Addr", l.Addr())
    84  	}
    85  }
    86  
    87  func TestWasip1NewFileConn(t *testing.T) {
    88  	if c, ok := newFileConn(newFD("tcp", -1)).(*TCPConn); !ok {
    89  		t.Errorf("newFileConn: tcp conn type mismatch: %T", c)
    90  	} else {
    91  		testIsTCPAddr(t, "LocalAddr", c.LocalAddr())
    92  		testIsTCPAddr(t, "RemoteAddr", c.RemoteAddr())
    93  	}
    94  	if c, ok := newFileConn(newFD("udp", -1)).(*UDPConn); !ok {
    95  		t.Errorf("newFileConn: udp conn type mismatch: %T", c)
    96  	} else {
    97  		testIsUDPAddr(t, "LocalAddr", c.LocalAddr())
    98  		testIsUDPAddr(t, "RemoteAddr", c.RemoteAddr())
    99  	}
   100  }
   101  
   102  func testIsTCPAddr(t *testing.T, method string, addr Addr) {
   103  	if _, ok := addr.(*TCPAddr); !ok {
   104  		t.Errorf("%s: returned address is not a *TCPAddr: %T", method, addr)
   105  	}
   106  }
   107  
   108  func testIsUDPAddr(t *testing.T, method string, addr Addr) {
   109  	if _, ok := addr.(*UDPAddr); !ok {
   110  		t.Errorf("%s: returned address is not a *UDPAddr: %T", method, addr)
   111  	}
   112  }
   113
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