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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: cgo_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 cgo && !netgo && (aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris)
// +build cgo
// +build !netgo
// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris

package net

/*
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
#include <string.h>

// If nothing else defined EAI_OVERFLOW, make sure it has a value.
#ifndef EAI_OVERFLOW
#define EAI_OVERFLOW -12
#endif
*/
import "C"

import (
	"context"
	"syscall"
	"unsafe"
)

// An addrinfoErrno represents a getaddrinfo, getnameinfo-specific
// error number. It's a signed number and a zero value is a non-error
// by convention.
type addrinfoErrno int

func (eai addrinfoErrno) Error() string   { return C.GoString(C.gai_strerror(C.int(eai))) }
func (eai addrinfoErrno) Temporary() bool { return eai == C.EAI_AGAIN }
func (eai addrinfoErrno) Timeout() bool   { return false }

type portLookupResult struct {
	port int
	err  error
}

type ipLookupResult struct {
	addrs []IPAddr
	cname string
	err   error
}

type reverseLookupResult struct {
	names []string
	err   error
}

func cgoLookupHost(ctx context.Context, name string) (hosts []string, err error, completed bool) {
	addrs, err, completed := cgoLookupIP(ctx, "ip", name)
	for _, addr := range addrs {
		hosts = append(hosts, addr.String())
	}
	return
}

func cgoLookupPort(ctx context.Context, network, service string) (port int, err error, completed bool) {
	var hints C.struct_addrinfo
	switch network {
	case "": // no hints
	case "tcp", "tcp4", "tcp6":
		hints.ai_socktype = C.SOCK_STREAM
		hints.ai_protocol = C.IPPROTO_TCP
	case "udp", "udp4", "udp6":
		hints.ai_socktype = C.SOCK_DGRAM
		hints.ai_protocol = C.IPPROTO_UDP
	default:
		return 0, &DNSError{Err: "unknown network", Name: network + "/" + service}, true
	}
	switch ipVersion(network) {
	case '4':
		hints.ai_family = C.AF_INET
	case '6':
		hints.ai_family = C.AF_INET6
	}
	if ctx.Done() == nil {
		port, err := cgoLookupServicePort(&hints, network, service)
		return port, err, true
	}
	result := make(chan portLookupResult, 1)
	go cgoPortLookup(result, &hints, network, service)
	select {
	case r := <-result:
		return r.port, r.err, true
	case <-ctx.Done():
		// Since there isn't a portable way to cancel the lookup,
		// we just let it finish and write to the buffered channel.
		return 0, mapErr(ctx.Err()), false
	}
}

func cgoLookupServicePort(hints *C.struct_addrinfo, network, service string) (port int, err error) {
	cservice := make([]byte, len(service)+1)
	copy(cservice, service)
	// Lowercase the C service name.
	for i, b := range cservice[:len(service)] {
		cservice[i] = lowerASCII(b)
	}
	var res *C.struct_addrinfo
	gerrno, err := C.getaddrinfo(nil, (*C.char)(unsafe.Pointer(&cservice[0])), hints, &res)
	if gerrno != 0 {
		isTemporary := false
		switch gerrno {
		case C.EAI_SYSTEM:
			if err == nil { // see golang.org/issue/6232
				err = syscall.EMFILE
			}
		default:
			err = addrinfoErrno(gerrno)
			isTemporary = addrinfoErrno(gerrno).Temporary()
		}
		return 0, &DNSError{Err: err.Error(), Name: network + "/" + service, IsTemporary: isTemporary}
	}
	defer C.freeaddrinfo(res)

for r := res; r != nil; r = r.ai_next {
		switch r.ai_family {
		case C.AF_INET:
			sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(r.ai_addr))
			p := (*[2]byte)(unsafe.Pointer(&sa.Port))
			return int(p[0])<<8 | int(p[1]), nil
		case C.AF_INET6:
			sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(r.ai_addr))
			p := (*[2]byte)(unsafe.Pointer(&sa.Port))
			return int(p[0])<<8 | int(p[1]), nil
		}
	}
	return 0, &DNSError{Err: "unknown port", Name: network + "/" + service}
}

func cgoPortLookup(result chan<- portLookupResult, hints *C.struct_addrinfo, network, service string) {
	port, err := cgoLookupServicePort(hints, network, service)
	result <- portLookupResult{port, err}
}

func cgoLookupIPCNAME(network, name string) (addrs []IPAddr, cname string, err error) {
	acquireThread()
	defer releaseThread()

var hints C.struct_addrinfo
	hints.ai_flags = cgoAddrInfoFlags
	hints.ai_socktype = C.SOCK_STREAM
	hints.ai_family = C.AF_UNSPEC
	switch ipVersion(network) {
	case '4':
		hints.ai_family = C.AF_INET
	case '6':
		hints.ai_family = C.AF_INET6
	}

h := make([]byte, len(name)+1)
	copy(h, name)
	var res *C.struct_addrinfo
	gerrno, err := C.getaddrinfo((*C.char)(unsafe.Pointer(&h[0])), nil, &hints, &res)
	if gerrno != 0 {
		isErrorNoSuchHost := false
		isTemporary := false
		switch gerrno {
		case C.EAI_SYSTEM:
			if err == nil {
				// err should not be nil, but sometimes getaddrinfo returns
				// gerrno == C.EAI_SYSTEM with err == nil on Linux.
				// The report claims that it happens when we have too many
				// open files, so use syscall.EMFILE (too many open files in system).
				// Most system calls would return ENFILE (too many open files),
				// so at the least EMFILE should be easy to recognize if this
				// comes up again. golang.org/issue/6232.
				err = syscall.EMFILE
			}
		case C.EAI_NONAME:
			err = errNoSuchHost
			isErrorNoSuchHost = true
		default:
			err = addrinfoErrno(gerrno)
			isTemporary = addrinfoErrno(gerrno).Temporary()
		}

return nil, "", &DNSError{Err: err.Error(), Name: name, IsNotFound: isErrorNoSuchHost, IsTemporary: isTemporary}
	}
	defer C.freeaddrinfo(res)

if res != nil {
		cname = C.GoString(res.ai_canonname)
		if cname == "" {
			cname = name
		}
		if len(cname) > 0 && cname[len(cname)-1] != '.' {
			cname += "."
		}
	}
	for r := res; r != nil; r = r.ai_next {
		// We only asked for SOCK_STREAM, but check anyhow.
		if r.ai_socktype != C.SOCK_STREAM {
			continue
		}
		switch r.ai_family {
		case C.AF_INET:
			sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(r.ai_addr))
			addr := IPAddr{IP: copyIP(sa.Addr[:])}
			addrs = append(addrs, addr)
		case C.AF_INET6:
			sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(r.ai_addr))
			addr := IPAddr{IP: copyIP(sa.Addr[:]), Zone: zoneCache.name(int(sa.Scope_id))}
			addrs = append(addrs, addr)
		}
	}
	return addrs, cname, nil
}

func cgoIPLookup(result chan<- ipLookupResult, network, name string) {
	addrs, cname, err := cgoLookupIPCNAME(network, name)
	result <- ipLookupResult{addrs, cname, err}
}

func cgoLookupIP(ctx context.Context, network, name string) (addrs []IPAddr, err error, completed bool) {
	if ctx.Done() == nil {
		addrs, _, err = cgoLookupIPCNAME(network, name)
		return addrs, err, true
	}
	result := make(chan ipLookupResult, 1)
	go cgoIPLookup(result, network, name)
	select {
	case r := <-result:
		return r.addrs, r.err, true
	case <-ctx.Done():
		return nil, mapErr(ctx.Err()), false
	}
}

func cgoLookupCNAME(ctx context.Context, name string) (cname string, err error, completed bool) {
	if ctx.Done() == nil {
		_, cname, err = cgoLookupIPCNAME("ip", name)
		return cname, err, true
	}
	result := make(chan ipLookupResult, 1)
	go cgoIPLookup(result, "ip", name)
	select {
	case r := <-result:
		return r.cname, r.err, true
	case <-ctx.Done():
		return "", mapErr(ctx.Err()), false
	}
}

// These are roughly enough for the following:
//
// Source		Encoding			Maximum length of single name entry
// Unicast DNS		ASCII or			<=253 + a NUL terminator
//			Unicode in RFC 5892		252 * total number of labels + delimiters + a NUL terminator
// Multicast DNS	UTF-8 in RFC 5198 or		<=253 + a NUL terminator
//			the same as unicast DNS ASCII	<=253 + a NUL terminator
// Local database	various				depends on implementation
const (
	nameinfoLen    = 64
	maxNameinfoLen = 4096
)

func cgoLookupPTR(ctx context.Context, addr string) (names []string, err error, completed bool) {
	var zone string
	ip := parseIPv4(addr)
	if ip == nil {
		ip, zone = parseIPv6Zone(addr)
	}
	if ip == nil {
		return nil, &DNSError{Err: "invalid address", Name: addr}, true
	}
	sa, salen := cgoSockaddr(ip, zone)
	if sa == nil {
		return nil, &DNSError{Err: "invalid address " + ip.String(), Name: addr}, true
	}
	if ctx.Done() == nil {
		names, err := cgoLookupAddrPTR(addr, sa, salen)
		return names, err, true
	}
	result := make(chan reverseLookupResult, 1)
	go cgoReverseLookup(result, addr, sa, salen)
	select {
	case r := <-result:
		return r.names, r.err, true
	case <-ctx.Done():
		return nil, mapErr(ctx.Err()), false
	}
}

func cgoLookupAddrPTR(addr string, sa *C.struct_sockaddr, salen C.socklen_t) (names []string, err error) {
	acquireThread()
	defer releaseThread()

var gerrno int
	var b []byte
	for l := nameinfoLen; l <= maxNameinfoLen; l *= 2 {
		b = make([]byte, l)
		gerrno, err = cgoNameinfoPTR(b, sa, salen)
		if gerrno == 0 || gerrno != C.EAI_OVERFLOW {
			break
		}
	}
	if gerrno != 0 {
		isTemporary := false
		switch gerrno {
		case C.EAI_SYSTEM:
			if err == nil { // see golang.org/issue/6232
				err = syscall.EMFILE
			}
		default:
			err = addrinfoErrno(gerrno)
			isTemporary = addrinfoErrno(gerrno).Temporary()
		}
		return nil, &DNSError{Err: err.Error(), Name: addr, IsTemporary: isTemporary}
	}
	for i := 0; i < len(b); i++ {
		if b[i] == 0 {
			b = b[:i]
			break
		}
	}
	return []string{absDomainName(b)}, nil
}

func cgoReverseLookup(result chan<- reverseLookupResult, addr string, sa *C.struct_sockaddr, salen C.socklen_t) {
	names, err := cgoLookupAddrPTR(addr, sa, salen)
	result <- reverseLookupResult{names, err}
}

func cgoSockaddr(ip IP, zone string) (*C.struct_sockaddr, C.socklen_t) {
	if ip4 := ip.To4(); ip4 != nil {
		return cgoSockaddrInet4(ip4), C.socklen_t(syscall.SizeofSockaddrInet4)
	}
	if ip6 := ip.To16(); ip6 != nil {
		return cgoSockaddrInet6(ip6, zoneCache.index(zone)), C.socklen_t(syscall.SizeofSockaddrInet6)
	}
	return nil, 0
}

func copyIP(x IP) IP {
	if len(x) < 16 {
		return x.To16()
	}
	y := make(IP, len(x))
	copy(y, x)
	return y
}

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Editing: cgo_unix.go

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