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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: lookup_windows.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.

package net

import (
	"context"
	"internal/syscall/windows"
	"os"
	"runtime"
	"syscall"
	"unsafe"
)

const _WSAHOST_NOT_FOUND = syscall.Errno(11001)

func winError(call string, err error) error {
	switch err {
	case _WSAHOST_NOT_FOUND:
		return errNoSuchHost
	}
	return os.NewSyscallError(call, err)
}

func getprotobyname(name string) (proto int, err error) {
	p, err := syscall.GetProtoByName(name)
	if err != nil {
		return 0, winError("getprotobyname", err)
	}
	return int(p.Proto), nil
}

// lookupProtocol looks up IP protocol name and returns correspondent protocol number.
func lookupProtocol(ctx context.Context, name string) (int, error) {
	// GetProtoByName return value is stored in thread local storage.
	// Start new os thread before the call to prevent races.
	type result struct {
		proto int
		err   error
	}
	ch := make(chan result) // unbuffered
	go func() {
		acquireThread()
		defer releaseThread()
		runtime.LockOSThread()
		defer runtime.UnlockOSThread()
		proto, err := getprotobyname(name)
		select {
		case ch <- result{proto: proto, err: err}:
		case <-ctx.Done():
		}
	}()
	select {
	case r := <-ch:
		if r.err != nil {
			if proto, err := lookupProtocolMap(name); err == nil {
				return proto, nil
			}

dnsError := &DNSError{Err: r.err.Error(), Name: name}
			if r.err == errNoSuchHost {
				dnsError.IsNotFound = true
			}
			r.err = dnsError
		}
		return r.proto, r.err
	case <-ctx.Done():
		return 0, mapErr(ctx.Err())
	}
}

func (r *Resolver) lookupHost(ctx context.Context, name string) ([]string, error) {
	ips, err := r.lookupIP(ctx, "ip", name)
	if err != nil {
		return nil, err
	}
	addrs := make([]string, 0, len(ips))
	for _, ip := range ips {
		addrs = append(addrs, ip.String())
	}
	return addrs, nil
}

func (r *Resolver) lookupIP(ctx context.Context, network, name string) ([]IPAddr, error) {
	// TODO(bradfitz,brainman): use ctx more. See TODO below.

var family int32 = syscall.AF_UNSPEC
	switch ipVersion(network) {
	case '4':
		family = syscall.AF_INET
	case '6':
		family = syscall.AF_INET6
	}

getaddr := func() ([]IPAddr, error) {
		acquireThread()
		defer releaseThread()
		hints := syscall.AddrinfoW{
			Family:   family,
			Socktype: syscall.SOCK_STREAM,
			Protocol: syscall.IPPROTO_IP,
		}
		var result *syscall.AddrinfoW
		name16p, err := syscall.UTF16PtrFromString(name)
		if err != nil {
			return nil, &DNSError{Name: name, Err: err.Error()}
		}
		e := syscall.GetAddrInfoW(name16p, nil, &hints, &result)
		if e != nil {
			err := winError("getaddrinfow", e)
			dnsError := &DNSError{Err: err.Error(), Name: name}
			if err == errNoSuchHost {
				dnsError.IsNotFound = true
			}
			return nil, dnsError
		}
		defer syscall.FreeAddrInfoW(result)
		addrs := make([]IPAddr, 0, 5)
		for ; result != nil; result = result.Next {
			addr := unsafe.Pointer(result.Addr)
			switch result.Family {
			case syscall.AF_INET:
				a := (*syscall.RawSockaddrInet4)(addr).Addr
				addrs = append(addrs, IPAddr{IP: IPv4(a[0], a[1], a[2], a[3])})
			case syscall.AF_INET6:
				a := (*syscall.RawSockaddrInet6)(addr).Addr
				zone := zoneCache.name(int((*syscall.RawSockaddrInet6)(addr).Scope_id))
				addrs = append(addrs, IPAddr{IP: IP{a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], a[11], a[12], a[13], a[14], a[15]}, Zone: zone})
			default:
				return nil, &DNSError{Err: syscall.EWINDOWS.Error(), Name: name}
			}
		}
		return addrs, nil
	}

type ret struct {
		addrs []IPAddr
		err   error
	}

var ch chan ret
	if ctx.Err() == nil {
		ch = make(chan ret, 1)
		go func() {
			addr, err := getaddr()
			ch <- ret{addrs: addr, err: err}
		}()
	}

select {
	case r := <-ch:
		return r.addrs, r.err
	case <-ctx.Done():
		// TODO(bradfitz,brainman): cancel the ongoing
		// GetAddrInfoW? It would require conditionally using
		// GetAddrInfoEx with lpOverlapped, which requires
		// Windows 8 or newer. I guess we'll need oldLookupIP,
		// newLookupIP, and newerLookUP.
		//
		// For now we just let it finish and write to the
		// buffered channel.
		return nil, &DNSError{
			Name:      name,
			Err:       ctx.Err().Error(),
			IsTimeout: ctx.Err() == context.DeadlineExceeded,
		}
	}
}

func (r *Resolver) lookupPort(ctx context.Context, network, service string) (int, error) {
	if r.preferGo() {
		return lookupPortMap(network, service)
	}

// TODO(bradfitz): finish ctx plumbing. Nothing currently depends on this.
	acquireThread()
	defer releaseThread()
	var stype int32
	switch network {
	case "tcp4", "tcp6":
		stype = syscall.SOCK_STREAM
	case "udp4", "udp6":
		stype = syscall.SOCK_DGRAM
	}
	hints := syscall.AddrinfoW{
		Family:   syscall.AF_UNSPEC,
		Socktype: stype,
		Protocol: syscall.IPPROTO_IP,
	}
	var result *syscall.AddrinfoW
	e := syscall.GetAddrInfoW(nil, syscall.StringToUTF16Ptr(service), &hints, &result)
	if e != nil {
		if port, err := lookupPortMap(network, service); err == nil {
			return port, nil
		}
		err := winError("getaddrinfow", e)
		dnsError := &DNSError{Err: err.Error(), Name: network + "/" + service}
		if err == errNoSuchHost {
			dnsError.IsNotFound = true
		}
		return 0, dnsError
	}
	defer syscall.FreeAddrInfoW(result)
	if result == nil {
		return 0, &DNSError{Err: syscall.EINVAL.Error(), Name: network + "/" + service}
	}
	addr := unsafe.Pointer(result.Addr)
	switch result.Family {
	case syscall.AF_INET:
		a := (*syscall.RawSockaddrInet4)(addr)
		return int(syscall.Ntohs(a.Port)), nil
	case syscall.AF_INET6:
		a := (*syscall.RawSockaddrInet6)(addr)
		return int(syscall.Ntohs(a.Port)), nil
	}
	return 0, &DNSError{Err: syscall.EINVAL.Error(), Name: network + "/" + service}
}

func (*Resolver) lookupCNAME(ctx context.Context, name string) (string, error) {
	// TODO(bradfitz): finish ctx plumbing. Nothing currently depends on this.
	acquireThread()
	defer releaseThread()
	var r *syscall.DNSRecord
	e := syscall.DnsQuery(name, syscall.DNS_TYPE_CNAME, 0, nil, &r, nil)
	// windows returns DNS_INFO_NO_RECORDS if there are no CNAME-s
	if errno, ok := e.(syscall.Errno); ok && errno == syscall.DNS_INFO_NO_RECORDS {
		// if there are no aliases, the canonical name is the input name
		return absDomainName([]byte(name)), nil
	}
	if e != nil {
		return "", &DNSError{Err: winError("dnsquery", e).Error(), Name: name}
	}
	defer syscall.DnsRecordListFree(r, 1)

resolved := resolveCNAME(syscall.StringToUTF16Ptr(name), r)
	cname := windows.UTF16PtrToString(resolved)
	return absDomainName([]byte(cname)), nil
}

func (*Resolver) lookupSRV(ctx context.Context, service, proto, name string) (string, []*SRV, error) {
	// TODO(bradfitz): finish ctx plumbing. Nothing currently depends on this.
	acquireThread()
	defer releaseThread()
	var target string
	if service == "" && proto == "" {
		target = name
	} else {
		target = "_" + service + "._" + proto + "." + name
	}
	var r *syscall.DNSRecord
	e := syscall.DnsQuery(target, syscall.DNS_TYPE_SRV, 0, nil, &r, nil)
	if e != nil {
		return "", nil, &DNSError{Err: winError("dnsquery", e).Error(), Name: target}
	}
	defer syscall.DnsRecordListFree(r, 1)

srvs := make([]*SRV, 0, 10)
	for _, p := range validRecs(r, syscall.DNS_TYPE_SRV, target) {
		v := (*syscall.DNSSRVData)(unsafe.Pointer(&p.Data[0]))
		srvs = append(srvs, &SRV{absDomainName([]byte(syscall.UTF16ToString((*[256]uint16)(unsafe.Pointer(v.Target))[:]))), v.Port, v.Priority, v.Weight})
	}
	byPriorityWeight(srvs).sort()
	return absDomainName([]byte(target)), srvs, nil
}

func (*Resolver) lookupMX(ctx context.Context, name string) ([]*MX, error) {
	// TODO(bradfitz): finish ctx plumbing. Nothing currently depends on this.
	acquireThread()
	defer releaseThread()
	var r *syscall.DNSRecord
	e := syscall.DnsQuery(name, syscall.DNS_TYPE_MX, 0, nil, &r, nil)
	if e != nil {
		return nil, &DNSError{Err: winError("dnsquery", e).Error(), Name: name}
	}
	defer syscall.DnsRecordListFree(r, 1)

mxs := make([]*MX, 0, 10)
	for _, p := range validRecs(r, syscall.DNS_TYPE_MX, name) {
		v := (*syscall.DNSMXData)(unsafe.Pointer(&p.Data[0]))
		mxs = append(mxs, &MX{absDomainName([]byte(windows.UTF16PtrToString(v.NameExchange))), v.Preference})
	}
	byPref(mxs).sort()
	return mxs, nil
}

func (*Resolver) lookupNS(ctx context.Context, name string) ([]*NS, error) {
	// TODO(bradfitz): finish ctx plumbing. Nothing currently depends on this.
	acquireThread()
	defer releaseThread()
	var r *syscall.DNSRecord
	e := syscall.DnsQuery(name, syscall.DNS_TYPE_NS, 0, nil, &r, nil)
	if e != nil {
		return nil, &DNSError{Err: winError("dnsquery", e).Error(), Name: name}
	}
	defer syscall.DnsRecordListFree(r, 1)

nss := make([]*NS, 0, 10)
	for _, p := range validRecs(r, syscall.DNS_TYPE_NS, name) {
		v := (*syscall.DNSPTRData)(unsafe.Pointer(&p.Data[0]))
		nss = append(nss, &NS{absDomainName([]byte(syscall.UTF16ToString((*[256]uint16)(unsafe.Pointer(v.Host))[:])))})
	}
	return nss, nil
}

func (*Resolver) lookupTXT(ctx context.Context, name string) ([]string, error) {
	// TODO(bradfitz): finish ctx plumbing. Nothing currently depends on this.
	acquireThread()
	defer releaseThread()
	var r *syscall.DNSRecord
	e := syscall.DnsQuery(name, syscall.DNS_TYPE_TEXT, 0, nil, &r, nil)
	if e != nil {
		return nil, &DNSError{Err: winError("dnsquery", e).Error(), Name: name}
	}
	defer syscall.DnsRecordListFree(r, 1)

txts := make([]string, 0, 10)
	for _, p := range validRecs(r, syscall.DNS_TYPE_TEXT, name) {
		d := (*syscall.DNSTXTData)(unsafe.Pointer(&p.Data[0]))
		s := ""
		for _, v := range (*[1 << 10]*uint16)(unsafe.Pointer(&(d.StringArray[0])))[:d.StringCount:d.StringCount] {
			s += windows.UTF16PtrToString(v)
		}
		txts = append(txts, s)
	}
	return txts, nil
}

func (*Resolver) lookupAddr(ctx context.Context, addr string) ([]string, error) {
	// TODO(bradfitz): finish ctx plumbing. Nothing currently depends on this.
	acquireThread()
	defer releaseThread()
	arpa, err := reverseaddr(addr)
	if err != nil {
		return nil, err
	}
	var r *syscall.DNSRecord
	e := syscall.DnsQuery(arpa, syscall.DNS_TYPE_PTR, 0, nil, &r, nil)
	if e != nil {
		return nil, &DNSError{Err: winError("dnsquery", e).Error(), Name: addr}
	}
	defer syscall.DnsRecordListFree(r, 1)

ptrs := make([]string, 0, 10)
	for _, p := range validRecs(r, syscall.DNS_TYPE_PTR, arpa) {
		v := (*syscall.DNSPTRData)(unsafe.Pointer(&p.Data[0]))
		ptrs = append(ptrs, absDomainName([]byte(windows.UTF16PtrToString(v.Host))))
	}
	return ptrs, nil
}

const dnsSectionMask = 0x0003

// returns only results applicable to name and resolves CNAME entries
func validRecs(r *syscall.DNSRecord, dnstype uint16, name string) []*syscall.DNSRecord {
	cname := syscall.StringToUTF16Ptr(name)
	if dnstype != syscall.DNS_TYPE_CNAME {
		cname = resolveCNAME(cname, r)
	}
	rec := make([]*syscall.DNSRecord, 0, 10)
	for p := r; p != nil; p = p.Next {
		// in case of a local machine, DNS records are returned with DNSREC_QUESTION flag instead of DNS_ANSWER
		if p.Dw&dnsSectionMask != syscall.DnsSectionAnswer && p.Dw&dnsSectionMask != syscall.DnsSectionQuestion {
			continue
		}
		if p.Type != dnstype {
			continue
		}
		if !syscall.DnsNameCompare(cname, p.Name) {
			continue
		}
		rec = append(rec, p)
	}
	return rec
}

// returns the last CNAME in chain
func resolveCNAME(name *uint16, r *syscall.DNSRecord) *uint16 {
	// limit cname resolving to 10 in case of an infinite CNAME loop
Cname:
	for cnameloop := 0; cnameloop < 10; cnameloop++ {
		for p := r; p != nil; p = p.Next {
			if p.Dw&dnsSectionMask != syscall.DnsSectionAnswer {
				continue
			}
			if p.Type != syscall.DNS_TYPE_CNAME {
				continue
			}
			if !syscall.DnsNameCompare(name, p.Name) {
				continue
			}
			name = (*syscall.DNSPTRData)(unsafe.Pointer(&r.Data[0])).Host
			continue Cname
		}
		break
	}
	return name
}

// concurrentThreadsLimit returns the number of threads we permit to
// run concurrently doing DNS lookups.
func concurrentThreadsLimit() int {
	return 500
}

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Editing: lookup_windows.go

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