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net: apply tcp4/tcp6 restrictions to literals in ResolveTCPAddr

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The restrictions were already being applied to the IP addresses
received from the host resolver. Apply the same restrictions to
literal IP addresses not passed to the host resolver.

For example, ResolveTCPAddr("tcp4", "[2001:db8::1]:http") used
to succeed and now does not (that's not an IPv4 address).

Perhaps a bit surprisingly,
ResolveTCPAddr("tcp4", "[::ffff:127.0.0.1]:http") succeeds,
behaving identically to ResolveTCPAddr("tcp4", "127.0.0.1:http"), and
ResolveTCPAddr("tcp6", "[::ffff:127.0.0.1]:http") fails,
behaving identically to ResolveTCPAddr("tcp6", "127.0.0.1:http").
Even so, it seems right to match (by reusing) the existing filtering
as applied to addresses resolved by the host C library.
If anyone can make a strong argument for changing the filtering
of IPv4-inside-IPv6 addresses, the fix can be applied to all
the code paths in a separate CL.

Fixes #14037.

Change-Id: I690dfdcbe93d730e11e00ea387fa7484cd524341
Reviewed-on: https://go-review.googlesource.com/32100
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Russ Cox 2016-10-26 20:44:26 -04:00
parent c4099c7593
commit 866e01457f
6 changed files with 57 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/net/dial.go
View File

@ -230,7 +230,7 @@ func (r *Resolver) resolveAddrList(ctx context.Context, op, network, addr string
}
}
if len(naddrs) == 0 {
return nil, errNoSuitableAddress
return nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: hint.String()}
}
return naddrs, nil
}

14
src/net/error_test.go
View File

@ -230,23 +230,27 @@ func TestDialAddrError(t *testing.T) {
} {
var err error
var c Conn
var op string
if tt.lit != "" {
c, err = Dial(tt.network, JoinHostPort(tt.lit, "0"))
op = fmt.Sprintf("Dial(%q, %q)", tt.network, JoinHostPort(tt.lit, "0"))
} else {
c, err = DialTCP(tt.network, nil, tt.addr)
op = fmt.Sprintf("DialTCP(%q, %q)", tt.network, tt.addr)
}
if err == nil {
c.Close()
t.Errorf("%s %q/%v: should fail", tt.network, tt.lit, tt.addr)
t.Errorf("%s succeeded, want error", op)
continue
}
if perr := parseDialError(err); perr != nil {
t.Error(perr)
t.Errorf("%s: %v", op, perr)
continue
}
aerr, ok := err.(*OpError).Err.(*AddrError)
operr := err.(*OpError).Err
aerr, ok := operr.(*AddrError)
if !ok {
t.Errorf("%s %q/%v: should be AddrError: %v", tt.network, tt.lit, tt.addr, err)
t.Errorf("%s: %v is %#T, want *AddrError", op, err, operr)
continue
}
want := tt.lit
@ -254,7 +258,7 @@ func TestDialAddrError(t *testing.T) {
want = tt.addr.IP.String()
}
if aerr.Addr != want {
t.Fatalf("%s: got %q; want %q", tt.network, aerr.Addr, want)
t.Errorf("%s: %v, error Addr=%q, want %q", op, err, aerr.Addr, want)
}
}
}

43
src/net/ipsock.go
View File

@ -76,7 +76,7 @@ func (addrs addrList) partition(strategy func(Addr) bool) (primaries, fallbacks
// yielding a list of Addr objects. Known filters are nil, ipv4only,
// and ipv6only. It returns every address when the filter is nil.
// The result contains at least one address when error is nil.
func filterAddrList(filter func(IPAddr) bool, ips []IPAddr, inetaddr func(IPAddr) Addr) (addrList, error) {
func filterAddrList(filter func(IPAddr) bool, ips []IPAddr, inetaddr func(IPAddr) Addr, originalAddr string) (addrList, error) {
var addrs addrList
for _, ip := range ips {
if filter == nil || filter(ip) {
@ -84,21 +84,19 @@ func filterAddrList(filter func(IPAddr) bool, ips []IPAddr, inetaddr func(IPAddr
}
}
if len(addrs) == 0 {
return nil, errNoSuitableAddress
return nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: originalAddr}
}
return addrs, nil
}
// ipv4only reports whether the kernel supports IPv4 addressing mode
// and addr is an IPv4 address.
// ipv4only reports whether addr is an IPv4 address.
func ipv4only(addr IPAddr) bool {
return supportsIPv4 && addr.IP.To4() != nil
return addr.IP.To4() != nil
}
// ipv6only reports whether the kernel supports IPv6 addressing mode
// and addr is an IPv6 address except IPv4-mapped IPv6 address.
// ipv6only reports whether addr is an IPv6 address except IPv4-mapped IPv6 address.
func ipv6only(addr IPAddr) bool {
return supportsIPv6 && len(addr.IP) == IPv6len && addr.IP.To4() == nil
return len(addr.IP) == IPv6len && addr.IP.To4() == nil
}
// SplitHostPort splits a network address of the form "host:port",
@ -228,20 +226,21 @@ func (r *Resolver) internetAddrList(ctx context.Context, net, addr string) (addr
if host == "" {
return addrList{inetaddr(IPAddr{})}, nil
}
// Try as a literal IP address.
var ip IP
if ip = parseIPv4(host); ip != nil {
return addrList{inetaddr(IPAddr{IP: ip})}, nil
}
var zone string
if ip, zone = parseIPv6(host, true); ip != nil {
return addrList{inetaddr(IPAddr{IP: ip, Zone: zone})}, nil
}
// Try as a DNS name.
ips, err := r.LookupIPAddr(ctx, host)
if err != nil {
return nil, err
// Try as a literal IP address, then as a DNS name.
var ips []IPAddr
if ip := parseIPv4(host); ip != nil {
ips = []IPAddr{{IP: ip}}
} else if ip, zone := parseIPv6(host, true); ip != nil {
ips = []IPAddr{{IP: ip, Zone: zone}}
} else {
// Try as a DNS name.
ips, err = r.LookupIPAddr(ctx, host)
if err != nil {
return nil, err
}
}
var filter func(IPAddr) bool
if net != "" && net[len(net)-1] == '4' {
filter = ipv4only
@ -249,7 +248,7 @@ func (r *Resolver) internetAddrList(ctx context.Context, net, addr string) (addr
if net != "" && net[len(net)-1] == '6' {
filter = ipv6only
}
return filterAddrList(filter, ips, inetaddr)
return filterAddrList(filter, ips, inetaddr, host)
}
func loopbackIP(net string) IP {

14
src/net/ipsock_test.go
View File

@ -205,13 +205,13 @@ var addrListTests = []struct {
nil,
},
{nil, nil, testInetaddr, nil, nil, nil, errNoSuitableAddress},
{nil, nil, testInetaddr, nil, nil, nil, &AddrError{errNoSuitableAddress.Error(), "ADDR"}},
{ipv4only, nil, testInetaddr, nil, nil, nil, errNoSuitableAddress},
{ipv4only, []IPAddr{{IP: IPv6loopback}}, testInetaddr, nil, nil, nil, errNoSuitableAddress},
{ipv4only, nil, testInetaddr, nil, nil, nil, &AddrError{errNoSuitableAddress.Error(), "ADDR"}},
{ipv4only, []IPAddr{{IP: IPv6loopback}}, testInetaddr, nil, nil, nil, &AddrError{errNoSuitableAddress.Error(), "ADDR"}},
{ipv6only, nil, testInetaddr, nil, nil, nil, errNoSuitableAddress},
{ipv6only, []IPAddr{{IP: IPv4(127, 0, 0, 1)}}, testInetaddr, nil, nil, nil, errNoSuitableAddress},
{ipv6only, nil, testInetaddr, nil, nil, nil, &AddrError{errNoSuitableAddress.Error(), "ADDR"}},
{ipv6only, []IPAddr{{IP: IPv4(127, 0, 0, 1)}}, testInetaddr, nil, nil, nil, &AddrError{errNoSuitableAddress.Error(), "ADDR"}},
}
func TestAddrList(t *testing.T) {
@ -220,8 +220,8 @@ func TestAddrList(t *testing.T) {
}
for i, tt := range addrListTests {
addrs, err := filterAddrList(tt.filter, tt.ips, tt.inetaddr)
if err != tt.err {
addrs, err := filterAddrList(tt.filter, tt.ips, tt.inetaddr, "ADDR")
if !reflect.DeepEqual(err, tt.err) {
t.Errorf("#%v: got %v; want %v", i, err, tt.err)
}
if tt.err != nil {

2
src/net/net.go
View File

@ -519,7 +519,7 @@ func (e *AddrError) Error() string {
}
s := e.Err
if e.Addr != "" {
s += " " + e.Addr
s = "address " + e.Addr + ": " + s
}
return s
}

30
src/net/tcpsock_test.go
View File

@ -311,6 +311,16 @@ var resolveTCPAddrTests = []resolveTCPAddrTest{
{"tcp", ":12345", &TCPAddr{Port: 12345}, nil},
{"http", "127.0.0.1:0", nil, UnknownNetworkError("http")},
{"tcp", "127.0.0.1:http", &TCPAddr{IP: ParseIP("127.0.0.1"), Port: 80}, nil},
{"tcp", "[::ffff:127.0.0.1]:http", &TCPAddr{IP: ParseIP("::ffff:127.0.0.1"), Port: 80}, nil},
{"tcp", "[2001:db8::1]:http", &TCPAddr{IP: ParseIP("2001:db8::1"), Port: 80}, nil},
{"tcp4", "127.0.0.1:http", &TCPAddr{IP: ParseIP("127.0.0.1"), Port: 80}, nil},
{"tcp4", "[::ffff:127.0.0.1]:http", &TCPAddr{IP: ParseIP("127.0.0.1"), Port: 80}, nil},
{"tcp4", "[2001:db8::1]:http", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "2001:db8::1"}},
{"tcp6", "127.0.0.1:http", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "127.0.0.1"}},
{"tcp6", "[::ffff:127.0.0.1]:http", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "::ffff:127.0.0.1"}},
{"tcp6", "[2001:db8::1]:http", &TCPAddr{IP: ParseIP("2001:db8::1"), Port: 80}, nil},
}
func TestResolveTCPAddr(t *testing.T) {
@ -318,21 +328,17 @@ func TestResolveTCPAddr(t *testing.T) {
defer func() { testHookLookupIP = origTestHookLookupIP }()
testHookLookupIP = lookupLocalhost
for i, tt := range resolveTCPAddrTests {
for _, tt := range resolveTCPAddrTests {
addr, err := ResolveTCPAddr(tt.network, tt.litAddrOrName)
if err != tt.err {
t.Errorf("#%d: %v", i, err)
} else if !reflect.DeepEqual(addr, tt.addr) {
t.Errorf("#%d: got %#v; want %#v", i, addr, tt.addr)
}
if err != nil {
if !reflect.DeepEqual(addr, tt.addr) || !reflect.DeepEqual(err, tt.err) {
t.Errorf("ResolveTCPAddr(%q, %q) = %v, %v, want %v, %v", tt.network, tt.litAddrOrName, addr, err, tt.addr, tt.err)
continue
}
rtaddr, err := ResolveTCPAddr(addr.Network(), addr.String())
if err != nil {
t.Errorf("#%d: %v", i, err)
} else if !reflect.DeepEqual(rtaddr, addr) {
t.Errorf("#%d: got %#v; want %#v", i, rtaddr, addr)
if err == nil {
addr2, err := ResolveTCPAddr(addr.Network(), addr.String())
if !reflect.DeepEqual(addr2, tt.addr) || err != tt.err {
t.Errorf("(%q, %q): ResolveTCPAddr(%q, %q) = %v, %v, want %v, %v", tt.network, tt.litAddrOrName, addr.Network(), addr.String(), addr2, err, tt.addr, tt.err)
}
}
}
}