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Current Path: /opt/golang/1.17.2/src/net

📁 ..
📄 addrselect.go(9.59 KB)
📄 addrselect_test.go(6.28 KB)
📄 cgo_aix.go(603 B)
📄 cgo_android.go(293 B)
📄 cgo_bsd.go(419 B)
📄 cgo_linux.go(672 B)
📄 cgo_netbsd.go(297 B)
📄 cgo_openbsd.go(297 B)
📄 cgo_resnew.go(668 B)
📄 cgo_resold.go(654 B)
📄 cgo_socknew.go(816 B)
📄 cgo_sockold.go(937 B)
📄 cgo_solaris.go(364 B)
📄 cgo_stub.go(1.08 KB)
📄 cgo_unix.go(9.65 KB)
📄 cgo_unix_test.go(2.01 KB)
📄 cgo_windows.go(423 B)
📄 conf.go(8.78 KB)
📄 conf_netcgo.go(387 B)
📄 conf_test.go(9.76 KB)
📄 conn_test.go(1.79 KB)
📄 dial.go(22.72 KB)
📄 dial_test.go(26.02 KB)
📄 dial_unix_test.go(2.83 KB)
📄 dnsclient.go(5.73 KB)
📄 dnsclient_test.go(1.51 KB)
📄 dnsclient_unix.go(22.12 KB)
📄 dnsclient_unix_test.go(54.46 KB)
📄 dnsconfig_unix.go(5.56 KB)
📄 dnsconfig_unix_test.go(6.83 KB)
📄 dnsname_test.go(1.99 KB)
📄 error_plan9.go(224 B)
📄 error_plan9_test.go(398 B)
📄 error_posix.go(700 B)
📄 error_posix_test.go(998 B)
📄 error_test.go(19.59 KB)
📄 error_unix.go(517 B)
📄 error_unix_test.go(702 B)
📄 error_windows.go(355 B)
📄 error_windows_test.go(483 B)
📄 example_test.go(3.88 KB)
📄 external_test.go(4.08 KB)
📄 fcntl_libc_test.go(400 B)
📄 fcntl_syscall_test.go(545 B)
📄 fd_plan9.go(3.56 KB)
📄 fd_posix.go(2.58 KB)
📄 fd_unix.go(5.54 KB)
📄 fd_windows.go(4.62 KB)
📄 file.go(1.69 KB)
📄 file_plan9.go(2.68 KB)
📄 file_stub.go(507 B)
📄 file_test.go(6.55 KB)
📄 file_unix.go(2.6 KB)
📄 file_windows.go(521 B)
📄 hook.go(628 B)
📄 hook_plan9.go(283 B)
📄 hook_unix.go(840 B)
📄 hook_windows.go(875 B)
📄 hosts.go(3.1 KB)
📄 hosts_test.go(4.59 KB)
📁 http
📄 interface.go(7.17 KB)
📄 interface_aix.go(4.41 KB)
📄 interface_bsd.go(2.8 KB)
📄 interface_bsd_test.go(1.48 KB)
📄 interface_bsdvar.go(753 B)
📄 interface_darwin.go(1.29 KB)
📄 interface_freebsd.go(1.42 KB)
📄 interface_linux.go(6.9 KB)
📄 interface_linux_test.go(3.65 KB)
📄 interface_plan9.go(4.68 KB)
📄 interface_solaris.go(2.07 KB)
📄 interface_stub.go(830 B)
📄 interface_test.go(9.68 KB)
📄 interface_unix_test.go(4.79 KB)
📄 interface_windows.go(5.41 KB)
📁 internal
📄 ip.go(17.66 KB)
📄 ip_test.go(25.33 KB)
📄 iprawsock.go(7.08 KB)
📄 iprawsock_plan9.go(874 B)
📄 iprawsock_posix.go(3.56 KB)
📄 iprawsock_test.go(5.63 KB)
📄 ipsock.go(8.97 KB)
📄 ipsock_plan9.go(7.5 KB)
📄 ipsock_plan9_test.go(645 B)
📄 ipsock_posix.go(6.28 KB)
📄 ipsock_test.go(6.81 KB)
📄 listen_test.go(21.34 KB)
📄 lookup.go(21.33 KB)
📄 lookup_fake.go(1.66 KB)
📄 lookup_plan9.go(7.68 KB)
📄 lookup_test.go(31.13 KB)
📄 lookup_unix.go(8.89 KB)
📄 lookup_windows.go(11.72 KB)
📄 lookup_windows_test.go(8.02 KB)
📄 mac.go(1.88 KB)
📄 mac_test.go(3.26 KB)
📁 mail
📄 main_cloexec_test.go(750 B)
📄 main_conf_test.go(952 B)
📄 main_noconf_test.go(537 B)
📄 main_plan9_test.go(392 B)
📄 main_posix_test.go(1.4 KB)
📄 main_test.go(7.13 KB)
📄 main_unix_test.go(1.33 KB)
📄 main_windows_test.go(1.08 KB)
📄 mockserver_test.go(11.39 KB)
📄 net.go(22.37 KB)
📄 net_fake.go(5.37 KB)
📄 net_test.go(13.88 KB)
📄 net_windows_test.go(15.94 KB)
📄 netgo_unix_test.go(741 B)
📄 nss.go(3.8 KB)
📄 nss_test.go(3.42 KB)
📄 packetconn_test.go(3.57 KB)
📄 parse.go(7.33 KB)
📄 parse_test.go(2.14 KB)
📄 pipe.go(5.43 KB)
📄 pipe_test.go(1.2 KB)
📄 platform_test.go(4.57 KB)
📄 port.go(1.46 KB)
📄 port_test.go(1.34 KB)
📄 port_unix.go(1.39 KB)
📄 protoconn_test.go(7.24 KB)
📄 rawconn.go(1.89 KB)
📄 rawconn_stub_test.go(655 B)
📄 rawconn_test.go(4.45 KB)
📄 rawconn_unix_test.go(3.1 KB)
📄 rawconn_windows_test.go(3.12 KB)
📁 rpc
📄 sendfile_linux.go(1.1 KB)
📄 sendfile_stub.go(391 B)
📄 sendfile_test.go(6.91 KB)
📄 sendfile_unix_alt.go(2.02 KB)
📄 sendfile_windows.go(1.02 KB)
📄 server_test.go(11.11 KB)
📁 smtp
📄 sock_bsd.go(968 B)
📄 sock_cloexec.go(1.53 KB)
📄 sock_linux.go(1.53 KB)
📄 sock_linux_test.go(545 B)
📄 sock_plan9.go(262 B)
📄 sock_posix.go(6.92 KB)
📄 sock_stub.go(420 B)
📄 sock_windows.go(1.16 KB)
📄 sockaddr_posix.go(1.05 KB)
📄 sockopt_aix.go(1.43 KB)
📄 sockopt_bsd.go(2.26 KB)
📄 sockopt_linux.go(1.25 KB)
📄 sockopt_plan9.go(406 B)
📄 sockopt_posix.go(2.76 KB)
📄 sockopt_solaris.go(1.25 KB)
📄 sockopt_stub.go(760 B)
📄 sockopt_windows.go(1.51 KB)
📄 sockoptip_bsdvar.go(929 B)
📄 sockoptip_linux.go(735 B)
📄 sockoptip_posix.go(1.53 KB)
📄 sockoptip_stub.go(971 B)
📄 sockoptip_windows.go(819 B)
📄 splice_linux.go(1.09 KB)
📄 splice_stub.go(304 B)
📄 splice_test.go(10.51 KB)
📄 sys_cloexec.go(1 KB)
📄 tcpsock.go(9.88 KB)
📄 tcpsock_plan9.go(2.13 KB)
📄 tcpsock_posix.go(5.39 KB)
📄 tcpsock_test.go(17.53 KB)
📄 tcpsock_unix_test.go(2.41 KB)
📄 tcpsockopt_darwin.go(770 B)
📄 tcpsockopt_dragonfly.go(698 B)
📄 tcpsockopt_openbsd.go(365 B)
📄 tcpsockopt_plan9.go(525 B)
📄 tcpsockopt_posix.go(592 B)
📄 tcpsockopt_solaris.go(1.15 KB)
📄 tcpsockopt_stub.go(415 B)
📄 tcpsockopt_unix.go(757 B)
📄 tcpsockopt_windows.go(741 B)
📁 testdata
📁 textproto
📄 timeout_test.go(23.39 KB)
📄 udpsock.go(9.19 KB)
📄 udpsock_plan9.go(3.79 KB)
📄 udpsock_plan9_test.go(1.31 KB)
📄 udpsock_posix.go(4.27 KB)
📄 udpsock_test.go(12.27 KB)
📄 unixsock.go(10.17 KB)
📄 unixsock_linux_test.go(2.29 KB)
📄 unixsock_plan9.go(1.24 KB)
📄 unixsock_posix.go(6.03 KB)
📄 unixsock_readmsg_cloexec.go(691 B)
📄 unixsock_readmsg_cmsg_cloexec.go(373 B)
📄 unixsock_readmsg_other.go(301 B)
📄 unixsock_readmsg_test.go(2.62 KB)
📄 unixsock_test.go(10.56 KB)
📄 unixsock_windows_test.go(2.09 KB)
📁 url
📄 write_unix_test.go(1.67 KB)
📄 writev_test.go(5.02 KB)
📄 writev_unix.go(797 B)

Editing: ipsock_posix.go

// Copyright 2009 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.

//go:build aix || darwin || dragonfly || freebsd || (js && wasm) || linux || netbsd || openbsd || solaris || windows
// +build aix darwin dragonfly freebsd js,wasm linux netbsd openbsd solaris windows

package net

import (
	"context"
	"internal/poll"
	"runtime"
	"syscall"
)

// probe probes IPv4, IPv6 and IPv4-mapped IPv6 communication
// capabilities which are controlled by the IPV6_V6ONLY socket option
// and kernel configuration.
//
// Should we try to use the IPv4 socket interface if we're only
// dealing with IPv4 sockets? As long as the host system understands
// IPv4-mapped IPv6, it's okay to pass IPv4-mapped IPv6 addresses to
// the IPv6 interface. That simplifies our code and is most
// general. Unfortunately, we need to run on kernels built without
// IPv6 support too. So probe the kernel to figure it out.
func (p *ipStackCapabilities) probe() {
	s, err := sysSocket(syscall.AF_INET, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
	switch err {
	case syscall.EAFNOSUPPORT, syscall.EPROTONOSUPPORT:
	case nil:
		poll.CloseFunc(s)
		p.ipv4Enabled = true
	}
	var probes = []struct {
		laddr TCPAddr
		value int
	}{
		// IPv6 communication capability
		{laddr: TCPAddr{IP: ParseIP("::1")}, value: 1},
		// IPv4-mapped IPv6 address communication capability
		{laddr: TCPAddr{IP: IPv4(127, 0, 0, 1)}, value: 0},
	}
	switch runtime.GOOS {
	case "dragonfly", "openbsd":
		// The latest DragonFly BSD and OpenBSD kernels don't
		// support IPV6_V6ONLY=0. They always return an error
		// and we don't need to probe the capability.
		probes = probes[:1]
	}
	for i := range probes {
		s, err := sysSocket(syscall.AF_INET6, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
		if err != nil {
			continue
		}
		defer poll.CloseFunc(s)
		syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, probes[i].value)
		sa, err := probes[i].laddr.sockaddr(syscall.AF_INET6)
		if err != nil {
			continue
		}
		if err := syscall.Bind(s, sa); err != nil {
			continue
		}
		if i == 0 {
			p.ipv6Enabled = true
		} else {
			p.ipv4MappedIPv6Enabled = true
		}
	}
}

// favoriteAddrFamily returns the appropriate address family for the
// given network, laddr, raddr and mode.
//
// If mode indicates "listen" and laddr is a wildcard, we assume that
// the user wants to make a passive-open connection with a wildcard
// address family, both AF_INET and AF_INET6, and a wildcard address
// like the following:
//
//	- A listen for a wildcard communication domain, "tcp" or
//	  "udp", with a wildcard address: If the platform supports
//	  both IPv6 and IPv4-mapped IPv6 communication capabilities,
//	  or does not support IPv4, we use a dual stack, AF_INET6 and
//	  IPV6_V6ONLY=0, wildcard address listen. The dual stack
//	  wildcard address listen may fall back to an IPv6-only,
//	  AF_INET6 and IPV6_V6ONLY=1, wildcard address listen.
//	  Otherwise we prefer an IPv4-only, AF_INET, wildcard address
//	  listen.
//
//	- A listen for a wildcard communication domain, "tcp" or
//	  "udp", with an IPv4 wildcard address: same as above.
//
//	- A listen for a wildcard communication domain, "tcp" or
//	  "udp", with an IPv6 wildcard address: same as above.
//
//	- A listen for an IPv4 communication domain, "tcp4" or "udp4",
//	  with an IPv4 wildcard address: We use an IPv4-only, AF_INET,
//	  wildcard address listen.
//
//	- A listen for an IPv6 communication domain, "tcp6" or "udp6",
//	  with an IPv6 wildcard address: We use an IPv6-only, AF_INET6
//	  and IPV6_V6ONLY=1, wildcard address listen.
//
// Otherwise guess: If the addresses are IPv4 then returns AF_INET,
// or else returns AF_INET6. It also returns a boolean value what
// designates IPV6_V6ONLY option.
//
// Note that the latest DragonFly BSD and OpenBSD kernels allow
// neither "net.inet6.ip6.v6only=1" change nor IPPROTO_IPV6 level
// IPV6_V6ONLY socket option setting.
func favoriteAddrFamily(network string, laddr, raddr sockaddr, mode string) (family int, ipv6only bool) {
	switch network[len(network)-1] {
	case '4':
		return syscall.AF_INET, false
	case '6':
		return syscall.AF_INET6, true
	}

if mode == "listen" && (laddr == nil || laddr.isWildcard()) {
		if supportsIPv4map() || !supportsIPv4() {
			return syscall.AF_INET6, false
		}
		if laddr == nil {
			return syscall.AF_INET, false
		}
		return laddr.family(), false
	}

if (laddr == nil || laddr.family() == syscall.AF_INET) &&
		(raddr == nil || raddr.family() == syscall.AF_INET) {
		return syscall.AF_INET, false
	}
	return syscall.AF_INET6, false
}

func internetSocket(ctx context.Context, net string, laddr, raddr sockaddr, sotype, proto int, mode string, ctrlFn func(string, string, syscall.RawConn) error) (fd *netFD, err error) {
	if (runtime.GOOS == "aix" || runtime.GOOS == "windows" || runtime.GOOS == "openbsd") && mode == "dial" && raddr.isWildcard() {
		raddr = raddr.toLocal(net)
	}
	family, ipv6only := favoriteAddrFamily(net, laddr, raddr, mode)
	return socket(ctx, net, family, sotype, proto, ipv6only, laddr, raddr, ctrlFn)
}

func ipToSockaddr(family int, ip IP, port int, zone string) (syscall.Sockaddr, error) {
	switch family {
	case syscall.AF_INET:
		if len(ip) == 0 {
			ip = IPv4zero
		}
		ip4 := ip.To4()
		if ip4 == nil {
			return nil, &AddrError{Err: "non-IPv4 address", Addr: ip.String()}
		}
		sa := &syscall.SockaddrInet4{Port: port}
		copy(sa.Addr[:], ip4)
		return sa, nil
	case syscall.AF_INET6:
		// In general, an IP wildcard address, which is either
		// "0.0.0.0" or "::", means the entire IP addressing
		// space. For some historical reason, it is used to
		// specify "any available address" on some operations
		// of IP node.
		//
		// When the IP node supports IPv4-mapped IPv6 address,
		// we allow a listener to listen to the wildcard
		// address of both IP addressing spaces by specifying
		// IPv6 wildcard address.
		if len(ip) == 0 || ip.Equal(IPv4zero) {
			ip = IPv6zero
		}
		// We accept any IPv6 address including IPv4-mapped
		// IPv6 address.
		ip6 := ip.To16()
		if ip6 == nil {
			return nil, &AddrError{Err: "non-IPv6 address", Addr: ip.String()}
		}
		sa := &syscall.SockaddrInet6{Port: port, ZoneId: uint32(zoneCache.index(zone))}
		copy(sa.Addr[:], ip6)
		return sa, nil
	}
	return nil, &AddrError{Err: "invalid address family", Addr: ip.String()}
}

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Editing: ipsock_posix.go

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