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// Copyright 2012 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package net_test import ( "context" "fmt" "io" "log" "net" "time" ) func ExampleListener() { // Listen on TCP port 2000 on all available unicast and // anycast IP addresses of the local system. l, err := net.Listen("tcp", ":2000") if err != nil { log.Fatal(err) } defer l.Close() for { // Wait for a connection. conn, err := l.Accept() if err != nil { log.Fatal(err) } // Handle the connection in a new goroutine. // The loop then returns to accepting, so that // multiple connections may be served concurrently. go func(c net.Conn) { // Echo all incoming data. io.Copy(c, c) // Shut down the connection. c.Close() }(conn) } } func ExampleDialer() { var d net.Dialer ctx, cancel := context.WithTimeout(context.Background(), time.Minute) defer cancel() conn, err := d.DialContext(ctx, "tcp", "localhost:12345") if err != nil { log.Fatalf("Failed to dial: %v", err) } defer conn.Close() if _, err := conn.Write([]byte("Hello, World!")); err != nil { log.Fatal(err) } } func ExampleDialer_unix() { // DialUnix does not take a context.Context parameter. This example shows // how to dial a Unix socket with a Context. Note that the Context only // applies to the dial operation; it does not apply to the connection once // it has been established. var d net.Dialer ctx, cancel := context.WithTimeout(context.Background(), time.Minute) defer cancel() d.LocalAddr = nil // if you have a local addr, add it here raddr := net.UnixAddr{Name: "/path/to/unix.sock", Net: "unix"} conn, err := d.DialContext(ctx, "unix", raddr.String()) if err != nil { log.Fatalf("Failed to dial: %v", err) } defer conn.Close() if _, err := conn.Write([]byte("Hello, socket!")); err != nil { log.Fatal(err) } } func ExampleIPv4() { fmt.Println(net.IPv4(8, 8, 8, 8)) // Output: // 8.8.8.8 } func ExampleParseCIDR() { ipv4Addr, ipv4Net, err := net.ParseCIDR("192.0.2.1/24") if err != nil { log.Fatal(err) } fmt.Println(ipv4Addr) fmt.Println(ipv4Net) ipv6Addr, ipv6Net, err := net.ParseCIDR("2001:db8:a0b:12f0::1/32") if err != nil { log.Fatal(err) } fmt.Println(ipv6Addr) fmt.Println(ipv6Net) // Output: // 192.0.2.1 // 192.0.2.0/24 // 2001:db8:a0b:12f0::1 // 2001:db8::/32 } func ExampleParseIP() { fmt.Println(net.ParseIP("192.0.2.1")) fmt.Println(net.ParseIP("2001:db8::68")) fmt.Println(net.ParseIP("192.0.2")) // Output: // 192.0.2.1 // 2001:db8::68 // } func ExampleIP_DefaultMask() { ip := net.ParseIP("192.0.2.1") fmt.Println(ip.DefaultMask()) // Output: // ffffff00 } func ExampleIP_Equal() { ipv4DNS := net.ParseIP("8.8.8.8") ipv4Lo := net.ParseIP("127.0.0.1") ipv6DNS := net.ParseIP("0:0:0:0:0:FFFF:0808:0808") fmt.Println(ipv4DNS.Equal(ipv4DNS)) fmt.Println(ipv4DNS.Equal(ipv4Lo)) fmt.Println(ipv4DNS.Equal(ipv6DNS)) // Output: // true // false // true } func ExampleIP_IsGlobalUnicast() { ipv6Global := net.ParseIP("2000::") ipv6UniqLocal := net.ParseIP("2000::") ipv6Multi := net.ParseIP("FF00::") ipv4Private := net.ParseIP("10.255.0.0") ipv4Public := net.ParseIP("8.8.8.8") ipv4Broadcast := net.ParseIP("255.255.255.255") fmt.Println(ipv6Global.IsGlobalUnicast()) fmt.Println(ipv6UniqLocal.IsGlobalUnicast()) fmt.Println(ipv6Multi.IsGlobalUnicast()) fmt.Println(ipv4Private.IsGlobalUnicast()) fmt.Println(ipv4Public.IsGlobalUnicast()) fmt.Println(ipv4Broadcast.IsGlobalUnicast()) // Output: // true // true // false // true // true // false } func ExampleIP_IsInterfaceLocalMulticast() { ipv6InterfaceLocalMulti := net.ParseIP("ff01::1") ipv6Global := net.ParseIP("2000::") ipv4 := net.ParseIP("255.0.0.0") fmt.Println(ipv6InterfaceLocalMulti.IsInterfaceLocalMulticast()) fmt.Println(ipv6Global.IsInterfaceLocalMulticast()) fmt.Println(ipv4.IsInterfaceLocalMulticast()) // Output: // true // false // false } func ExampleIP_IsLinkLocalMulticast() { ipv6LinkLocalMulti := net.ParseIP("ff02::2") ipv6LinkLocalUni := net.ParseIP("fe80::") ipv4LinkLocalMulti := net.ParseIP("224.0.0.0") ipv4LinkLocalUni := net.ParseIP("169.254.0.0") fmt.Println(ipv6LinkLocalMulti.IsLinkLocalMulticast()) fmt.Println(ipv6LinkLocalUni.IsLinkLocalMulticast()) fmt.Println(ipv4LinkLocalMulti.IsLinkLocalMulticast()) fmt.Println(ipv4LinkLocalUni.IsLinkLocalMulticast()) // Output: // true // false // true // false } func ExampleIP_IsLinkLocalUnicast() { ipv6LinkLocalUni := net.ParseIP("fe80::") ipv6Global := net.ParseIP("2000::") ipv4LinkLocalUni := net.ParseIP("169.254.0.0") ipv4LinkLocalMulti := net.ParseIP("224.0.0.0") fmt.Println(ipv6LinkLocalUni.IsLinkLocalUnicast()) fmt.Println(ipv6Global.IsLinkLocalUnicast()) fmt.Println(ipv4LinkLocalUni.IsLinkLocalUnicast()) fmt.Println(ipv4LinkLocalMulti.IsLinkLocalUnicast()) // Output: // true // false // true // false } func ExampleIP_IsLoopback() { ipv6Lo := net.ParseIP("::1") ipv6 := net.ParseIP("ff02::1") ipv4Lo := net.ParseIP("127.0.0.0") ipv4 := net.ParseIP("128.0.0.0") fmt.Println(ipv6Lo.IsLoopback()) fmt.Println(ipv6.IsLoopback()) fmt.Println(ipv4Lo.IsLoopback()) fmt.Println(ipv4.IsLoopback()) // Output: // true // false // true // false } func ExampleIP_IsMulticast() { ipv6Multi := net.ParseIP("FF00::") ipv6LinkLocalMulti := net.ParseIP("ff02::1") ipv6Lo := net.ParseIP("::1") ipv4Multi := net.ParseIP("239.0.0.0") ipv4LinkLocalMulti := net.ParseIP("224.0.0.0") ipv4Lo := net.ParseIP("127.0.0.0") fmt.Println(ipv6Multi.IsMulticast()) fmt.Println(ipv6LinkLocalMulti.IsMulticast()) fmt.Println(ipv6Lo.IsMulticast()) fmt.Println(ipv4Multi.IsMulticast()) fmt.Println(ipv4LinkLocalMulti.IsMulticast()) fmt.Println(ipv4Lo.IsMulticast()) // Output: // true // true // false // true // true // false } func ExampleIP_IsPrivate() { ipv6Private := net.ParseIP("fc00::") ipv6Public := net.ParseIP("fe00::") ipv4Private := net.ParseIP("10.255.0.0") ipv4Public := net.ParseIP("11.0.0.0") fmt.Println(ipv6Private.IsPrivate()) fmt.Println(ipv6Public.IsPrivate()) fmt.Println(ipv4Private.IsPrivate()) fmt.Println(ipv4Public.IsPrivate()) // Output: // true // false // true // false } func ExampleIP_IsUnspecified() { ipv6Unspecified := net.ParseIP("::") ipv6Specified := net.ParseIP("fe00::") ipv4Unspecified := net.ParseIP("0.0.0.0") ipv4Specified := net.ParseIP("8.8.8.8") fmt.Println(ipv6Unspecified.IsUnspecified()) fmt.Println(ipv6Specified.IsUnspecified()) fmt.Println(ipv4Unspecified.IsUnspecified()) fmt.Println(ipv4Specified.IsUnspecified()) // Output: // true // false // true // false } func ExampleIP_Mask() { ipv4Addr := net.ParseIP("192.0.2.1") // This mask corresponds to a /24 subnet for IPv4. ipv4Mask := net.CIDRMask(24, 32) fmt.Println(ipv4Addr.Mask(ipv4Mask)) ipv6Addr := net.ParseIP("2001:db8:a0b:12f0::1") // This mask corresponds to a /32 subnet for IPv6. ipv6Mask := net.CIDRMask(32, 128) fmt.Println(ipv6Addr.Mask(ipv6Mask)) // Output: // 192.0.2.0 // 2001:db8:: } func ExampleIP_String() { ipv6 := net.IP{0xfc, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} ipv4 := net.IPv4(10, 255, 0, 0) fmt.Println(ipv6.String()) fmt.Println(ipv4.String()) // Output: // fc00:: // 10.255.0.0 } func ExampleIP_To16() { ipv6 := net.IP{0xfc, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} ipv4 := net.IPv4(10, 255, 0, 0) fmt.Println(ipv6.To16()) fmt.Println(ipv4.To16()) // Output: // fc00:: // 10.255.0.0 } func ExampleIP_to4() { ipv6 := net.IP{0xfc, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} ipv4 := net.IPv4(10, 255, 0, 0) fmt.Println(ipv6.To4()) fmt.Println(ipv4.To4()) // Output: // // 10.255.0.0 } func ExampleCIDRMask() { // This mask corresponds to a /31 subnet for IPv4. fmt.Println(net.CIDRMask(31, 32)) // This mask corresponds to a /64 subnet for IPv6. fmt.Println(net.CIDRMask(64, 128)) // Output: // fffffffe // ffffffffffffffff0000000000000000 } func ExampleIPv4Mask() { fmt.Println(net.IPv4Mask(255, 255, 255, 0)) // Output: // ffffff00 } func ExampleUDPConn_WriteTo() { // Unlike Dial, ListenPacket creates a connection without any // association with peers. conn, err := net.ListenPacket("udp", ":0") if err != nil { log.Fatal(err) } defer conn.Close() dst, err := net.ResolveUDPAddr("udp", "192.0.2.1:2000") if err != nil { log.Fatal(err) } // The connection can write data to the desired address. _, err = conn.WriteTo([]byte("data"), dst) if err != nil { log.Fatal(err) } }