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net: make IP.{String,MarshalText} return helpful information on address error

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This change makes String and MarshalText methods of IP return a
hexadecial form of IP with no punctuation as part of error
notification. It doesn't affect the existing behavior of ParseIP.

Also fixes bad shadowing in ipToSockaddr and makes use of reserved
IP address blocks for documnetation.

Fixes #15052.
Updates #15228.

Change-Id: I9e9ecce308952ed5683066c3d1bb6a7b36458c65
Reviewed-on: https://go-review.googlesource.com/21642
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Mikio Hara 2016-04-07 17:19:29 +09:00
parent a119f88f2c
commit 1f54410a61
4 changed files with 192 additions and 43 deletions
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49
src/net/error_test.go
View File

@ -206,6 +206,55 @@ func TestProtocolDialError(t *testing.T) {
}
}
func TestDialAddrError(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9":
t.Skipf("not supported on %s", runtime.GOOS)
}
for _, tt := range []struct {
network string
lit string
addr *TCPAddr
}{
{"tcp4", "::1", nil},
{"tcp4", "", &TCPAddr{IP: IPv6loopback}},
// We don't test the {"tcp6", "byte sequence", nil}
// case for now because there is no easy way to
// control name resolution.
{"tcp6", "", &TCPAddr{IP: IP{0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef}}},
} {
var err error
var c Conn
if tt.lit != "" {
c, err = Dial(tt.network, JoinHostPort(tt.lit, "0"))
} else {
c, err = DialTCP(tt.network, nil, tt.addr)
}
if err == nil {
c.Close()
t.Errorf("%s %q/%v: should fail", tt.network, tt.lit, tt.addr)
continue
}
if perr := parseDialError(err); perr != nil {
t.Error(perr)
continue
}
aerr, ok := err.(*OpError).Err.(*AddrError)
if !ok {
t.Errorf("%s %q/%v: should be AddrError: %v", tt.network, tt.lit, tt.addr, err)
continue
}
want := tt.lit
if tt.lit == "" {
want = tt.addr.IP.String()
}
if aerr.Addr != want {
t.Fatalf("%s: got %q; want %q", tt.network, aerr.Addr, want)
}
}
}
var listenErrorTests = []struct {
network, address string
}{

24
src/net/ip.go
View File

@ -252,9 +252,11 @@ func (ip IP) Mask(mask IPMask) IP {
}
// String returns the string form of the IP address ip.
// If the address is an IPv4 address, the string representation
// is dotted decimal ("74.125.19.99"). Otherwise the representation
// is IPv6 ("2001:4860:0:2001::68").
// It returns one of 4 forms:
// - "<nil>", if ip has length 0
// - dotted decimal ("192.0.2.1"), if ip is an IPv4 or IP4-mapped IPv6 address
// - IPv6 ("2001:db9::1"), if ip is a valid IPv6 address
// - the hexadecimal form of ip, without punctuation, if no other cases apply
func (ip IP) String() string {
p := ip
@ -270,7 +272,7 @@ func (ip IP) String() string {
uitoa(uint(p4[3]))
}
if len(p) != IPv6len {
return "?"
return hexString(ip)
}
// Find longest run of zeros.
@ -312,6 +314,14 @@ func (ip IP) String() string {
return string(b)
}
func hexString(b []byte) string {
s := make([]byte, len(b)*2)
for i, tn := range b {
s[i*2], s[i*2+1] = hexDigit[tn>>4], hexDigit[tn&0xf]
}
return string(s)
}
// ipEmptyString is like ip.String except that it returns
// an empty string when ip is unset.
func ipEmptyString(ip IP) string {
@ -426,11 +436,7 @@ func (m IPMask) String() string {
if len(m) == 0 {
return "<nil>"
}
buf := make([]byte, len(m)*2)
for i, b := range m {
buf[i*2], buf[i*2+1] = hexDigit[b>>4], hexDigit[b&0xf]
}
return string(buf)
return hexString(m)
}
func networkNumberAndMask(n *IPNet) (ip IP, m IPMask) {

126
src/net/ip_test.go
View File

@ -5,6 +5,7 @@
package net
import (
"bytes"
"reflect"
"runtime"
"testing"
@ -124,30 +125,119 @@ func TestMarshalEmptyIP(t *testing.T) {
}
var ipStringTests = []struct {
in IP
out string // see RFC 5952
in IP // see RFC 791 and RFC 4291
str string // see RFC 791, RFC 4291 and RFC 5952
byt []byte
error
}{
{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1}, "2001:db8::123:12:1"},
{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x1}, "2001:db8::1"},
{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1}, "2001:db8:0:1:0:1:0:1"},
{IP{0x20, 0x1, 0xd, 0xb8, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0}, "2001:db8:1:0:1:0:1:0"},
{IP{0x20, 0x1, 0, 0, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1}, "2001::1:0:0:1"},
{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0}, "2001:db8:0:0:1::"},
{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1}, "2001:db8::1:0:0:1"},
{IP{0x20, 0x1, 0xD, 0xB8, 0, 0, 0, 0, 0, 0xA, 0, 0xB, 0, 0xC, 0, 0xD}, "2001:db8::a:b:c:d"},
{IPv4(192, 168, 0, 1), "192.168.0.1"},
{nil, ""},
// IPv4 address
{
IP{192, 0, 2, 1},
"192.0.2.1",
[]byte("192.0.2.1"),
nil,
},
{
IP{0, 0, 0, 0},
"0.0.0.0",
[]byte("0.0.0.0"),
nil,
},
// IPv4-mapped IPv6 address
{
IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 192, 0, 2, 1},
"192.0.2.1",
[]byte("192.0.2.1"),
nil,
},
{
IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 0, 0, 0, 0},
"0.0.0.0",
[]byte("0.0.0.0"),
nil,
},
// IPv6 address
{
IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1},
"2001:db8::123:12:1",
[]byte("2001:db8::123:12:1"),
nil,
},
{
IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x1},
"2001:db8::1",
[]byte("2001:db8::1"),
nil,
},
{
IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1},
"2001:db8:0:1:0:1:0:1",
[]byte("2001:db8:0:1:0:1:0:1"),
nil,
},
{
IP{0x20, 0x1, 0xd, 0xb8, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0},
"2001:db8:1:0:1:0:1:0",
[]byte("2001:db8:1:0:1:0:1:0"),
nil,
},
{
IP{0x20, 0x1, 0, 0, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1},
"2001::1:0:0:1",
[]byte("2001::1:0:0:1"),
nil,
},
{
IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0},
"2001:db8:0:0:1::",
[]byte("2001:db8:0:0:1::"),
nil,
},
{
IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1},
"2001:db8::1:0:0:1",
[]byte("2001:db8::1:0:0:1"),
nil,
},
{
IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0xa, 0, 0xb, 0, 0xc, 0, 0xd},
"2001:db8::a:b:c:d",
[]byte("2001:db8::a:b:c:d"),
nil,
},
{
IPv6unspecified,
"::",
[]byte("::"),
nil,
},
// IP wildcard equivalent address in Dial/Listen API
{
nil,
"<nil>",
nil,
nil,
},
// Opaque byte sequence
{
IP{0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef},
"0123456789abcdef",
nil,
&AddrError{Err: "invalid IP address", Addr: "0123456789abcdef"},
},
}
func TestIPString(t *testing.T) {
for _, tt := range ipStringTests {
if tt.in != nil {
if out := tt.in.String(); out != tt.out {
t.Errorf("IP.String(%v) = %q, want %q", tt.in, out, tt.out)
}
if out := tt.in.String(); out != tt.str {
t.Errorf("IP.String(%v) = %q, want %q", tt.in, out, tt.str)
}
if out, err := tt.in.MarshalText(); string(out) != tt.out || err != nil {
t.Errorf("IP.MarshalText(%v) = %q, %v, want %q, nil", tt.in, out, err, tt.out)
if out, err := tt.in.MarshalText(); !bytes.Equal(out, tt.byt) || !reflect.DeepEqual(err, tt.error) {
t.Errorf("IP.MarshalText(%v) = %v, %v, want %v, %v", tt.in, out, err, tt.byt, tt.error)
}
}
}

36
src/net/ipsock_posix.go
View File

@ -4,8 +4,6 @@
// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris windows
// Internet protocol family sockets for POSIX
package net
import (
@ -52,7 +50,7 @@ func probeIPv6Stack() (supportsIPv6, supportsIPv4map bool) {
}{
// IPv6 communication capability
{laddr: TCPAddr{IP: ParseIP("::1")}, value: 1},
// IPv6 IPv4-mapped address communication capability
// IPv4-mapped IPv6 address communication capability
{laddr: TCPAddr{IP: IPv4(127, 0, 0, 1)}, value: 0},
}
var supps [2]bool
@ -154,8 +152,6 @@ func favoriteAddrFamily(net string, laddr, raddr sockaddr, mode string) (family
return syscall.AF_INET6, false
}
// Internet sockets (TCP, UDP, IP)
func internetSocket(net string, laddr, raddr sockaddr, deadline time.Time, sotype, proto int, mode string, cancel <-chan struct{}) (fd *netFD, err error) {
family, ipv6only := favoriteAddrFamily(net, laddr, raddr, mode)
return socket(net, family, sotype, proto, ipv6only, laddr, raddr, deadline, cancel)
@ -167,27 +163,35 @@ func ipToSockaddr(family int, ip IP, port int, zone string) (syscall.Sockaddr, e
if len(ip) == 0 {
ip = IPv4zero
}
if ip = ip.To4(); ip == nil {
ip4 := ip.To4()
if ip4 == nil {
return nil, &AddrError{Err: "non-IPv4 address", Addr: ip.String()}
}
sa := &syscall.SockaddrInet4{Port: port}
copy(sa.Addr[:], ip)
copy(sa.Addr[:], ip4)
return sa, nil
case syscall.AF_INET6:
if len(ip) == 0 {
// 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 an 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
}
// IPv4 callers use 0.0.0.0 to mean "announce on any available address".
// In IPv6 mode, Linux treats that as meaning "announce on 0.0.0.0",
// which it refuses to do. Rewrite to the IPv6 unspecified address.
if ip.Equal(IPv4zero) {
ip = IPv6zero
}
if ip = ip.To16(); ip == nil {
// 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(zoneToInt(zone))}
copy(sa.Addr[:], ip)
copy(sa.Addr[:], ip6)
return sa, nil
}
return nil, &AddrError{Err: "invalid address family", Addr: ip.String()}