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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_unix.go

// Copyright 2011 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 || linux || netbsd || openbsd || solaris
// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris

package net

import (
	"context"
	"internal/bytealg"
	"sync"
	"syscall"

"golang.org/x/net/dns/dnsmessage"
)

var onceReadProtocols sync.Once

// readProtocols loads contents of /etc/protocols into protocols map
// for quick access.
func readProtocols() {
	file, err := open("/etc/protocols")
	if err != nil {
		return
	}
	defer file.close()

for line, ok := file.readLine(); ok; line, ok = file.readLine() {
		// tcp    6   TCP    # transmission control protocol
		if i := bytealg.IndexByteString(line, '#'); i >= 0 {
			line = line[0:i]
		}
		f := getFields(line)
		if len(f) < 2 {
			continue
		}
		if proto, _, ok := dtoi(f[1]); ok {
			if _, ok := protocols[f[0]]; !ok {
				protocols[f[0]] = proto
			}
			for _, alias := range f[2:] {
				if _, ok := protocols[alias]; !ok {
					protocols[alias] = proto
				}
			}
		}
	}
}

// lookupProtocol looks up IP protocol name in /etc/protocols and
// returns correspondent protocol number.
func lookupProtocol(_ context.Context, name string) (int, error) {
	onceReadProtocols.Do(readProtocols)
	return lookupProtocolMap(name)
}

func (r *Resolver) dial(ctx context.Context, network, server string) (Conn, error) {
	// Calling Dial here is scary -- we have to be sure not to
	// dial a name that will require a DNS lookup, or Dial will
	// call back here to translate it. The DNS config parser has
	// already checked that all the cfg.servers are IP
	// addresses, which Dial will use without a DNS lookup.
	var c Conn
	var err error
	if r != nil && r.Dial != nil {
		c, err = r.Dial(ctx, network, server)
	} else {
		var d Dialer
		c, err = d.DialContext(ctx, network, server)
	}
	if err != nil {
		return nil, mapErr(err)
	}
	return c, nil
}

func (r *Resolver) lookupHost(ctx context.Context, host string) (addrs []string, err error) {
	order := systemConf().hostLookupOrder(r, host)
	if !r.preferGo() && order == hostLookupCgo {
		if addrs, err, ok := cgoLookupHost(ctx, host); ok {
			return addrs, err
		}
		// cgo not available (or netgo); fall back to Go's DNS resolver
		order = hostLookupFilesDNS
	}
	return r.goLookupHostOrder(ctx, host, order)
}

func (r *Resolver) lookupIP(ctx context.Context, network, host string) (addrs []IPAddr, err error) {
	if r.preferGo() {
		return r.goLookupIP(ctx, network, host)
	}
	order := systemConf().hostLookupOrder(r, host)
	if order == hostLookupCgo {
		if addrs, err, ok := cgoLookupIP(ctx, network, host); ok {
			return addrs, err
		}
		// cgo not available (or netgo); fall back to Go's DNS resolver
		order = hostLookupFilesDNS
	}
	ips, _, err := r.goLookupIPCNAMEOrder(ctx, network, host, order)
	return ips, err
}

func (r *Resolver) lookupPort(ctx context.Context, network, service string) (int, error) {
	if !r.preferGo() && systemConf().canUseCgo() {
		if port, err, ok := cgoLookupPort(ctx, network, service); ok {
			if err != nil {
				// Issue 18213: if cgo fails, first check to see whether we
				// have the answer baked-in to the net package.
				if port, err := goLookupPort(network, service); err == nil {
					return port, nil
				}
			}
			return port, err
		}
	}
	return goLookupPort(network, service)
}

func (r *Resolver) lookupCNAME(ctx context.Context, name string) (string, error) {
	if !r.preferGo() && systemConf().canUseCgo() {
		if cname, err, ok := cgoLookupCNAME(ctx, name); ok {
			return cname, err
		}
	}
	return r.goLookupCNAME(ctx, name)
}

func (r *Resolver) lookupSRV(ctx context.Context, service, proto, name string) (string, []*SRV, error) {
	var target string
	if service == "" && proto == "" {
		target = name
	} else {
		target = "_" + service + "._" + proto + "." + name
	}
	p, server, err := r.lookup(ctx, target, dnsmessage.TypeSRV)
	if err != nil {
		return "", nil, err
	}
	var srvs []*SRV
	var cname dnsmessage.Name
	for {
		h, err := p.AnswerHeader()
		if err == dnsmessage.ErrSectionDone {
			break
		}
		if err != nil {
			return "", nil, &DNSError{
				Err:    "cannot unmarshal DNS message",
				Name:   name,
				Server: server,
			}
		}
		if h.Type != dnsmessage.TypeSRV {
			if err := p.SkipAnswer(); err != nil {
				return "", nil, &DNSError{
					Err:    "cannot unmarshal DNS message",
					Name:   name,
					Server: server,
				}
			}
			continue
		}
		if cname.Length == 0 && h.Name.Length != 0 {
			cname = h.Name
		}
		srv, err := p.SRVResource()
		if err != nil {
			return "", nil, &DNSError{
				Err:    "cannot unmarshal DNS message",
				Name:   name,
				Server: server,
			}
		}
		srvs = append(srvs, &SRV{Target: srv.Target.String(), Port: srv.Port, Priority: srv.Priority, Weight: srv.Weight})
	}
	byPriorityWeight(srvs).sort()
	return cname.String(), srvs, nil
}

func (r *Resolver) lookupMX(ctx context.Context, name string) ([]*MX, error) {
	p, server, err := r.lookup(ctx, name, dnsmessage.TypeMX)
	if err != nil {
		return nil, err
	}
	var mxs []*MX
	for {
		h, err := p.AnswerHeader()
		if err == dnsmessage.ErrSectionDone {
			break
		}
		if err != nil {
			return nil, &DNSError{
				Err:    "cannot unmarshal DNS message",
				Name:   name,
				Server: server,
			}
		}
		if h.Type != dnsmessage.TypeMX {
			if err := p.SkipAnswer(); err != nil {
				return nil, &DNSError{
					Err:    "cannot unmarshal DNS message",
					Name:   name,
					Server: server,
				}
			}
			continue
		}
		mx, err := p.MXResource()
		if err != nil {
			return nil, &DNSError{
				Err:    "cannot unmarshal DNS message",
				Name:   name,
				Server: server,
			}
		}
		mxs = append(mxs, &MX{Host: mx.MX.String(), Pref: mx.Pref})

}
	byPref(mxs).sort()
	return mxs, nil
}

func (r *Resolver) lookupNS(ctx context.Context, name string) ([]*NS, error) {
	p, server, err := r.lookup(ctx, name, dnsmessage.TypeNS)
	if err != nil {
		return nil, err
	}
	var nss []*NS
	for {
		h, err := p.AnswerHeader()
		if err == dnsmessage.ErrSectionDone {
			break
		}
		if err != nil {
			return nil, &DNSError{
				Err:    "cannot unmarshal DNS message",
				Name:   name,
				Server: server,
			}
		}
		if h.Type != dnsmessage.TypeNS {
			if err := p.SkipAnswer(); err != nil {
				return nil, &DNSError{
					Err:    "cannot unmarshal DNS message",
					Name:   name,
					Server: server,
				}
			}
			continue
		}
		ns, err := p.NSResource()
		if err != nil {
			return nil, &DNSError{
				Err:    "cannot unmarshal DNS message",
				Name:   name,
				Server: server,
			}
		}
		nss = append(nss, &NS{Host: ns.NS.String()})
	}
	return nss, nil
}

func (r *Resolver) lookupTXT(ctx context.Context, name string) ([]string, error) {
	p, server, err := r.lookup(ctx, name, dnsmessage.TypeTXT)
	if err != nil {
		return nil, err
	}
	var txts []string
	for {
		h, err := p.AnswerHeader()
		if err == dnsmessage.ErrSectionDone {
			break
		}
		if err != nil {
			return nil, &DNSError{
				Err:    "cannot unmarshal DNS message",
				Name:   name,
				Server: server,
			}
		}
		if h.Type != dnsmessage.TypeTXT {
			if err := p.SkipAnswer(); err != nil {
				return nil, &DNSError{
					Err:    "cannot unmarshal DNS message",
					Name:   name,
					Server: server,
				}
			}
			continue
		}
		txt, err := p.TXTResource()
		if err != nil {
			return nil, &DNSError{
				Err:    "cannot unmarshal DNS message",
				Name:   name,
				Server: server,
			}
		}
		// Multiple strings in one TXT record need to be
		// concatenated without separator to be consistent
		// with previous Go resolver.
		n := 0
		for _, s := range txt.TXT {
			n += len(s)
		}
		txtJoin := make([]byte, 0, n)
		for _, s := range txt.TXT {
			txtJoin = append(txtJoin, s...)
		}
		if len(txts) == 0 {
			txts = make([]string, 0, 1)
		}
		txts = append(txts, string(txtJoin))
	}
	return txts, nil
}

func (r *Resolver) lookupAddr(ctx context.Context, addr string) ([]string, error) {
	if !r.preferGo() && systemConf().canUseCgo() {
		if ptrs, err, ok := cgoLookupPTR(ctx, addr); ok {
			return ptrs, err
		}
	}
	return r.goLookupPTR(ctx, addr)
}

// concurrentThreadsLimit returns the number of threads we permit to
// run concurrently doing DNS lookups via cgo. A DNS lookup may use a
// file descriptor so we limit this to less than the number of
// permitted open files. On some systems, notably Darwin, if
// getaddrinfo is unable to open a file descriptor it simply returns
// EAI_NONAME rather than a useful error. Limiting the number of
// concurrent getaddrinfo calls to less than the permitted number of
// file descriptors makes that error less likely. We don't bother to
// apply the same limit to DNS lookups run directly from Go, because
// there we will return a meaningful "too many open files" error.
func concurrentThreadsLimit() int {
	var rlim syscall.Rlimit
	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rlim); err != nil {
		return 500
	}
	r := int(rlim.Cur)
	if r > 500 {
		r = 500
	} else if r > 30 {
		r -= 30
	}
	return r
}

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Editing: lookup_unix.go

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