| // 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 ( |
| "bytes" |
| "context" |
| "fmt" |
| "internal/testenv" |
| "runtime" |
| "strings" |
| "testing" |
| "time" |
| ) |
| |
| func lookupLocalhost(ctx context.Context, fn func(context.Context, string) ([]IPAddr, error), host string) ([]IPAddr, error) { |
| switch host { |
| case "localhost": |
| return []IPAddr{ |
| {IP: IPv4(127, 0, 0, 1)}, |
| {IP: IPv6loopback}, |
| }, nil |
| default: |
| return fn(ctx, host) |
| } |
| } |
| |
| // The Lookup APIs use various sources such as local database, DNS or |
| // mDNS, and may use platform-dependent DNS stub resolver if possible. |
| // The APIs accept any of forms for a query; host name in various |
| // encodings, UTF-8 encoded net name, domain name, FQDN or absolute |
| // FQDN, but the result would be one of the forms and it depends on |
| // the circumstances. |
| |
| var lookupGoogleSRVTests = []struct { |
| service, proto, name string |
| cname, target string |
| }{ |
| { |
| "xmpp-server", "tcp", "google.com", |
| "google.com.", "google.com.", |
| }, |
| { |
| "xmpp-server", "tcp", "google.com.", |
| "google.com.", "google.com.", |
| }, |
| |
| // non-standard back door |
| { |
| "", "", "_xmpp-server._tcp.google.com", |
| "google.com.", "google.com.", |
| }, |
| { |
| "", "", "_xmpp-server._tcp.google.com.", |
| "google.com.", "google.com.", |
| }, |
| } |
| |
| func TestLookupGoogleSRV(t *testing.T) { |
| if testenv.Builder() == "" { |
| testenv.MustHaveExternalNetwork(t) |
| } |
| |
| if !supportsIPv4 || !*testIPv4 { |
| t.Skip("IPv4 is required") |
| } |
| |
| for _, tt := range lookupGoogleSRVTests { |
| cname, srvs, err := LookupSRV(tt.service, tt.proto, tt.name) |
| if err != nil { |
| testenv.SkipFlakyNet(t) |
| t.Fatal(err) |
| } |
| if len(srvs) == 0 { |
| t.Error("got no record") |
| } |
| if !strings.HasSuffix(cname, tt.cname) { |
| t.Errorf("got %s; want %s", cname, tt.cname) |
| } |
| for _, srv := range srvs { |
| if !strings.HasSuffix(srv.Target, tt.target) { |
| t.Errorf("got %v; want a record containing %s", srv, tt.target) |
| } |
| } |
| } |
| } |
| |
| var lookupGmailMXTests = []struct { |
| name, host string |
| }{ |
| {"gmail.com", "google.com."}, |
| {"gmail.com.", "google.com."}, |
| } |
| |
| func TestLookupGmailMX(t *testing.T) { |
| if testenv.Builder() == "" { |
| testenv.MustHaveExternalNetwork(t) |
| } |
| |
| if !supportsIPv4 || !*testIPv4 { |
| t.Skip("IPv4 is required") |
| } |
| |
| for _, tt := range lookupGmailMXTests { |
| mxs, err := LookupMX(tt.name) |
| if err != nil { |
| t.Fatal(err) |
| } |
| if len(mxs) == 0 { |
| t.Error("got no record") |
| } |
| for _, mx := range mxs { |
| if !strings.HasSuffix(mx.Host, tt.host) { |
| t.Errorf("got %v; want a record containing %s", mx, tt.host) |
| } |
| } |
| } |
| } |
| |
| var lookupGmailNSTests = []struct { |
| name, host string |
| }{ |
| {"gmail.com", "google.com."}, |
| {"gmail.com.", "google.com."}, |
| } |
| |
| func TestLookupGmailNS(t *testing.T) { |
| if testenv.Builder() == "" { |
| testenv.MustHaveExternalNetwork(t) |
| } |
| |
| if !supportsIPv4 || !*testIPv4 { |
| t.Skip("IPv4 is required") |
| } |
| |
| for _, tt := range lookupGmailNSTests { |
| nss, err := LookupNS(tt.name) |
| if err != nil { |
| testenv.SkipFlakyNet(t) |
| t.Fatal(err) |
| } |
| if len(nss) == 0 { |
| t.Error("got no record") |
| } |
| for _, ns := range nss { |
| if !strings.HasSuffix(ns.Host, tt.host) { |
| t.Errorf("got %v; want a record containing %s", ns, tt.host) |
| } |
| } |
| } |
| } |
| |
| var lookupGmailTXTTests = []struct { |
| name, txt, host string |
| }{ |
| {"gmail.com", "spf", "google.com"}, |
| {"gmail.com.", "spf", "google.com"}, |
| } |
| |
| func TestLookupGmailTXT(t *testing.T) { |
| if testenv.Builder() == "" { |
| testenv.MustHaveExternalNetwork(t) |
| } |
| |
| if !supportsIPv4 || !*testIPv4 { |
| t.Skip("IPv4 is required") |
| } |
| |
| for _, tt := range lookupGmailTXTTests { |
| txts, err := LookupTXT(tt.name) |
| if err != nil { |
| t.Fatal(err) |
| } |
| if len(txts) == 0 { |
| t.Error("got no record") |
| } |
| for _, txt := range txts { |
| if !strings.Contains(txt, tt.txt) || (!strings.HasSuffix(txt, tt.host) && !strings.HasSuffix(txt, tt.host+".")) { |
| t.Errorf("got %s; want a record containing %s, %s", txt, tt.txt, tt.host) |
| } |
| } |
| } |
| } |
| |
| var lookupGooglePublicDNSAddrTests = []struct { |
| addr, name string |
| }{ |
| {"8.8.8.8", ".google.com."}, |
| {"8.8.4.4", ".google.com."}, |
| |
| {"2001:4860:4860::8888", ".google.com."}, |
| {"2001:4860:4860::8844", ".google.com."}, |
| } |
| |
| func TestLookupGooglePublicDNSAddr(t *testing.T) { |
| if testenv.Builder() == "" { |
| testenv.MustHaveExternalNetwork(t) |
| } |
| |
| if !supportsIPv4 || !supportsIPv6 || !*testIPv4 || !*testIPv6 { |
| t.Skip("both IPv4 and IPv6 are required") |
| } |
| |
| for _, tt := range lookupGooglePublicDNSAddrTests { |
| names, err := LookupAddr(tt.addr) |
| if err != nil { |
| t.Fatal(err) |
| } |
| if len(names) == 0 { |
| t.Error("got no record") |
| } |
| for _, name := range names { |
| if !strings.HasSuffix(name, tt.name) { |
| t.Errorf("got %s; want a record containing %s", name, tt.name) |
| } |
| } |
| } |
| } |
| |
| func TestLookupIPv6LinkLocalAddr(t *testing.T) { |
| if !supportsIPv6 || !*testIPv6 { |
| t.Skip("IPv6 is required") |
| } |
| |
| addrs, err := LookupHost("localhost") |
| if err != nil { |
| t.Fatal(err) |
| } |
| found := false |
| for _, addr := range addrs { |
| if addr == "fe80::1%lo0" { |
| found = true |
| break |
| } |
| } |
| if !found { |
| t.Skipf("not supported on %s", runtime.GOOS) |
| } |
| if _, err := LookupAddr("fe80::1%lo0"); err != nil { |
| t.Error(err) |
| } |
| } |
| |
| var lookupIANACNAMETests = []struct { |
| name, cname string |
| }{ |
| {"www.iana.org", "icann.org."}, |
| {"www.iana.org.", "icann.org."}, |
| } |
| |
| func TestLookupIANACNAME(t *testing.T) { |
| if testenv.Builder() == "" { |
| testenv.MustHaveExternalNetwork(t) |
| } |
| |
| if !supportsIPv4 || !*testIPv4 { |
| t.Skip("IPv4 is required") |
| } |
| |
| for _, tt := range lookupIANACNAMETests { |
| cname, err := LookupCNAME(tt.name) |
| if err != nil { |
| t.Fatal(err) |
| } |
| if !strings.HasSuffix(cname, tt.cname) { |
| t.Errorf("got %s; want a record containing %s", cname, tt.cname) |
| } |
| } |
| } |
| |
| var lookupGoogleHostTests = []struct { |
| name string |
| }{ |
| {"google.com"}, |
| {"google.com."}, |
| } |
| |
| func TestLookupGoogleHost(t *testing.T) { |
| if testenv.Builder() == "" { |
| testenv.MustHaveExternalNetwork(t) |
| } |
| |
| if !supportsIPv4 || !*testIPv4 { |
| t.Skip("IPv4 is required") |
| } |
| |
| for _, tt := range lookupGoogleHostTests { |
| addrs, err := LookupHost(tt.name) |
| if err != nil { |
| t.Fatal(err) |
| } |
| if len(addrs) == 0 { |
| t.Error("got no record") |
| } |
| for _, addr := range addrs { |
| if ParseIP(addr) == nil { |
| t.Errorf("got %q; want a literal IP address", addr) |
| } |
| } |
| } |
| } |
| |
| var lookupGoogleIPTests = []struct { |
| name string |
| }{ |
| {"google.com"}, |
| {"google.com."}, |
| } |
| |
| func TestLookupGoogleIP(t *testing.T) { |
| if testenv.Builder() == "" { |
| testenv.MustHaveExternalNetwork(t) |
| } |
| |
| if !supportsIPv4 || !*testIPv4 { |
| t.Skip("IPv4 is required") |
| } |
| |
| for _, tt := range lookupGoogleIPTests { |
| ips, err := LookupIP(tt.name) |
| if err != nil { |
| t.Fatal(err) |
| } |
| if len(ips) == 0 { |
| t.Error("got no record") |
| } |
| for _, ip := range ips { |
| if ip.To4() == nil && ip.To16() == nil { |
| t.Errorf("got %v; want an IP address", ip) |
| } |
| } |
| } |
| } |
| |
| var revAddrTests = []struct { |
| Addr string |
| Reverse string |
| ErrPrefix string |
| }{ |
| {"1.2.3.4", "4.3.2.1.in-addr.arpa.", ""}, |
| {"245.110.36.114", "114.36.110.245.in-addr.arpa.", ""}, |
| {"::ffff:12.34.56.78", "78.56.34.12.in-addr.arpa.", ""}, |
| {"::1", "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.", ""}, |
| {"1::", "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.0.0.ip6.arpa.", ""}, |
| {"1234:567::89a:bcde", "e.d.c.b.a.9.8.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.7.6.5.0.4.3.2.1.ip6.arpa.", ""}, |
| {"1234:567:fefe:bcbc:adad:9e4a:89a:bcde", "e.d.c.b.a.9.8.0.a.4.e.9.d.a.d.a.c.b.c.b.e.f.e.f.7.6.5.0.4.3.2.1.ip6.arpa.", ""}, |
| {"1.2.3", "", "unrecognized address"}, |
| {"1.2.3.4.5", "", "unrecognized address"}, |
| {"1234:567:bcbca::89a:bcde", "", "unrecognized address"}, |
| {"1234:567::bcbc:adad::89a:bcde", "", "unrecognized address"}, |
| } |
| |
| func TestReverseAddress(t *testing.T) { |
| for i, tt := range revAddrTests { |
| a, err := reverseaddr(tt.Addr) |
| if len(tt.ErrPrefix) > 0 && err == nil { |
| t.Errorf("#%d: expected %q, got <nil> (error)", i, tt.ErrPrefix) |
| continue |
| } |
| if len(tt.ErrPrefix) == 0 && err != nil { |
| t.Errorf("#%d: expected <nil>, got %q (error)", i, err) |
| } |
| if err != nil && err.(*DNSError).Err != tt.ErrPrefix { |
| t.Errorf("#%d: expected %q, got %q (mismatched error)", i, tt.ErrPrefix, err.(*DNSError).Err) |
| } |
| if a != tt.Reverse { |
| t.Errorf("#%d: expected %q, got %q (reverse address)", i, tt.Reverse, a) |
| } |
| } |
| } |
| |
| func TestDNSFlood(t *testing.T) { |
| if !*testDNSFlood { |
| t.Skip("test disabled; use -dnsflood to enable") |
| } |
| |
| var N = 5000 |
| if runtime.GOOS == "darwin" { |
| // On Darwin this test consumes kernel threads much |
| // than other platforms for some reason. |
| // When we monitor the number of allocated Ms by |
| // observing on runtime.newm calls, we can see that it |
| // easily reaches the per process ceiling |
| // kern.num_threads when CGO_ENABLED=1 and |
| // GODEBUG=netdns=go. |
| N = 500 |
| } |
| |
| const timeout = 3 * time.Second |
| ctxHalfTimeout, cancel := context.WithTimeout(context.Background(), timeout/2) |
| defer cancel() |
| ctxTimeout, cancel := context.WithTimeout(context.Background(), timeout) |
| defer cancel() |
| |
| c := make(chan error, 2*N) |
| for i := 0; i < N; i++ { |
| name := fmt.Sprintf("%d.net-test.golang.org", i) |
| go func() { |
| _, err := DefaultResolver.LookupIPAddr(ctxHalfTimeout, name) |
| c <- err |
| }() |
| go func() { |
| _, err := DefaultResolver.LookupIPAddr(ctxTimeout, name) |
| c <- err |
| }() |
| } |
| qstats := struct { |
| succeeded, failed int |
| timeout, temporary, other int |
| unknown int |
| }{} |
| deadline := time.After(timeout + time.Second) |
| for i := 0; i < 2*N; i++ { |
| select { |
| case <-deadline: |
| t.Fatal("deadline exceeded") |
| case err := <-c: |
| switch err := err.(type) { |
| case nil: |
| qstats.succeeded++ |
| case Error: |
| qstats.failed++ |
| if err.Timeout() { |
| qstats.timeout++ |
| } |
| if err.Temporary() { |
| qstats.temporary++ |
| } |
| if !err.Timeout() && !err.Temporary() { |
| qstats.other++ |
| } |
| default: |
| qstats.failed++ |
| qstats.unknown++ |
| } |
| } |
| } |
| |
| // A high volume of DNS queries for sub-domain of golang.org |
| // would be coordinated by authoritative or recursive server, |
| // or stub resolver which implements query-response rate |
| // limitation, so we can expect some query successes and more |
| // failures including timeout, temporary and other here. |
| // As a rule, unknown must not be shown but it might possibly |
| // happen due to issue 4856 for now. |
| t.Logf("%v succeeded, %v failed (%v timeout, %v temporary, %v other, %v unknown)", qstats.succeeded, qstats.failed, qstats.timeout, qstats.temporary, qstats.other, qstats.unknown) |
| } |
| |
| func TestLookupDotsWithLocalSource(t *testing.T) { |
| if !supportsIPv4 || !*testIPv4 { |
| t.Skip("IPv4 is required") |
| } |
| |
| if testenv.Builder() == "" { |
| testenv.MustHaveExternalNetwork(t) |
| } |
| |
| for i, fn := range []func() func(){forceGoDNS, forceCgoDNS} { |
| fixup := fn() |
| if fixup == nil { |
| continue |
| } |
| names, err := LookupAddr("127.0.0.1") |
| fixup() |
| if err != nil { |
| t.Logf("#%d: %v", i, err) |
| continue |
| } |
| mode := "netgo" |
| if i == 1 { |
| mode = "netcgo" |
| } |
| loop: |
| for i, name := range names { |
| if strings.Index(name, ".") == len(name)-1 { // "localhost" not "localhost." |
| for j := range names { |
| if j == i { |
| continue |
| } |
| if names[j] == name[:len(name)-1] { |
| // It's OK if we find the name without the dot, |
| // as some systems say 127.0.0.1 localhost localhost. |
| continue loop |
| } |
| } |
| t.Errorf("%s: got %s; want %s", mode, name, name[:len(name)-1]) |
| } else if strings.Contains(name, ".") && !strings.HasSuffix(name, ".") { // "localhost.localdomain." not "localhost.localdomain" |
| t.Errorf("%s: got %s; want name ending with trailing dot", mode, name) |
| } |
| } |
| } |
| } |
| |
| func TestLookupDotsWithRemoteSource(t *testing.T) { |
| if testenv.Builder() == "" { |
| testenv.MustHaveExternalNetwork(t) |
| } |
| |
| if !supportsIPv4 || !*testIPv4 { |
| t.Skip("IPv4 is required") |
| } |
| |
| if fixup := forceGoDNS(); fixup != nil { |
| testDots(t, "go") |
| fixup() |
| } |
| if fixup := forceCgoDNS(); fixup != nil { |
| testDots(t, "cgo") |
| fixup() |
| } |
| } |
| |
| func testDots(t *testing.T, mode string) { |
| names, err := LookupAddr("8.8.8.8") // Google dns server |
| if err != nil { |
| testenv.SkipFlakyNet(t) |
| t.Errorf("LookupAddr(8.8.8.8): %v (mode=%v)", err, mode) |
| } else { |
| for _, name := range names { |
| if !strings.HasSuffix(name, ".google.com.") { |
| t.Errorf("LookupAddr(8.8.8.8) = %v, want names ending in .google.com. with trailing dot (mode=%v)", names, mode) |
| break |
| } |
| } |
| } |
| |
| cname, err := LookupCNAME("www.mit.edu") |
| if err != nil { |
| testenv.SkipFlakyNet(t) |
| t.Errorf("LookupCNAME(www.mit.edu, mode=%v): %v", mode, err) |
| } else if !strings.HasSuffix(cname, ".") { |
| t.Errorf("LookupCNAME(www.mit.edu) = %v, want cname ending in . with trailing dot (mode=%v)", cname, mode) |
| } |
| |
| mxs, err := LookupMX("google.com") |
| if err != nil { |
| testenv.SkipFlakyNet(t) |
| t.Errorf("LookupMX(google.com): %v (mode=%v)", err, mode) |
| } else { |
| for _, mx := range mxs { |
| if !strings.HasSuffix(mx.Host, ".google.com.") { |
| t.Errorf("LookupMX(google.com) = %v, want names ending in .google.com. with trailing dot (mode=%v)", mxString(mxs), mode) |
| break |
| } |
| } |
| } |
| |
| nss, err := LookupNS("google.com") |
| if err != nil { |
| testenv.SkipFlakyNet(t) |
| t.Errorf("LookupNS(google.com): %v (mode=%v)", err, mode) |
| } else { |
| for _, ns := range nss { |
| if !strings.HasSuffix(ns.Host, ".google.com.") { |
| t.Errorf("LookupNS(google.com) = %v, want names ending in .google.com. with trailing dot (mode=%v)", nsString(nss), mode) |
| break |
| } |
| } |
| } |
| |
| cname, srvs, err := LookupSRV("xmpp-server", "tcp", "google.com") |
| if err != nil { |
| testenv.SkipFlakyNet(t) |
| t.Errorf("LookupSRV(xmpp-server, tcp, google.com): %v (mode=%v)", err, mode) |
| } else { |
| if !strings.HasSuffix(cname, ".google.com.") { |
| t.Errorf("LookupSRV(xmpp-server, tcp, google.com) returned cname=%v, want name ending in .google.com. with trailing dot (mode=%v)", cname, mode) |
| } |
| for _, srv := range srvs { |
| if !strings.HasSuffix(srv.Target, ".google.com.") { |
| t.Errorf("LookupSRV(xmpp-server, tcp, google.com) returned addrs=%v, want names ending in .google.com. with trailing dot (mode=%v)", srvString(srvs), mode) |
| break |
| } |
| } |
| } |
| } |
| |
| func mxString(mxs []*MX) string { |
| var buf bytes.Buffer |
| sep := "" |
| fmt.Fprintf(&buf, "[") |
| for _, mx := range mxs { |
| fmt.Fprintf(&buf, "%s%s:%d", sep, mx.Host, mx.Pref) |
| sep = " " |
| } |
| fmt.Fprintf(&buf, "]") |
| return buf.String() |
| } |
| |
| func nsString(nss []*NS) string { |
| var buf bytes.Buffer |
| sep := "" |
| fmt.Fprintf(&buf, "[") |
| for _, ns := range nss { |
| fmt.Fprintf(&buf, "%s%s", sep, ns.Host) |
| sep = " " |
| } |
| fmt.Fprintf(&buf, "]") |
| return buf.String() |
| } |
| |
| func srvString(srvs []*SRV) string { |
| var buf bytes.Buffer |
| sep := "" |
| fmt.Fprintf(&buf, "[") |
| for _, srv := range srvs { |
| fmt.Fprintf(&buf, "%s%s:%d:%d:%d", sep, srv.Target, srv.Port, srv.Priority, srv.Weight) |
| sep = " " |
| } |
| fmt.Fprintf(&buf, "]") |
| return buf.String() |
| } |
| |
| func TestLookupPort(t *testing.T) { |
| // See http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml |
| // |
| // Please be careful about adding new test cases. |
| // There are platforms having incomplete mappings for |
| // restricted resource access and security reasons. |
| type test struct { |
| network string |
| name string |
| port int |
| ok bool |
| } |
| var tests = []test{ |
| {"tcp", "0", 0, true}, |
| {"udp", "0", 0, true}, |
| {"udp", "domain", 53, true}, |
| |
| {"--badnet--", "zzz", 0, false}, |
| {"tcp", "--badport--", 0, false}, |
| {"tcp", "-1", 0, false}, |
| {"tcp", "65536", 0, false}, |
| {"udp", "-1", 0, false}, |
| {"udp", "65536", 0, false}, |
| {"tcp", "123456789", 0, false}, |
| |
| // Issue 13610: LookupPort("tcp", "") |
| {"tcp", "", 0, true}, |
| {"tcp4", "", 0, true}, |
| {"tcp6", "", 0, true}, |
| {"udp", "", 0, true}, |
| {"udp4", "", 0, true}, |
| {"udp6", "", 0, true}, |
| } |
| |
| switch runtime.GOOS { |
| case "android": |
| if netGo { |
| t.Skipf("not supported on %s without cgo; see golang.org/issues/14576", runtime.GOOS) |
| } |
| default: |
| tests = append(tests, test{"tcp", "http", 80, true}) |
| } |
| |
| for _, tt := range tests { |
| port, err := LookupPort(tt.network, tt.name) |
| if port != tt.port || (err == nil) != tt.ok { |
| t.Errorf("LookupPort(%q, %q) = %d, %v; want %d, error=%t", tt.network, tt.name, port, err, tt.port, !tt.ok) |
| } |
| if err != nil { |
| if perr := parseLookupPortError(err); perr != nil { |
| t.Error(perr) |
| } |
| } |
| } |
| } |
| |
| // Like TestLookupPort but with minimal tests that should always pass |
| // because the answers are baked-in to the net package. |
| func TestLookupPort_Minimal(t *testing.T) { |
| type test struct { |
| network string |
| name string |
| port int |
| } |
| var tests = []test{ |
| {"tcp", "http", 80}, |
| {"tcp", "HTTP", 80}, // case shouldn't matter |
| {"tcp", "https", 443}, |
| {"tcp", "ssh", 22}, |
| {"tcp", "gopher", 70}, |
| {"tcp4", "http", 80}, |
| {"tcp6", "http", 80}, |
| } |
| |
| for _, tt := range tests { |
| port, err := LookupPort(tt.network, tt.name) |
| if port != tt.port || err != nil { |
| t.Errorf("LookupPort(%q, %q) = %d, %v; want %d, error=nil", tt.network, tt.name, port, err, tt.port) |
| } |
| } |
| } |
| |
| func TestLookupProtocol_Minimal(t *testing.T) { |
| type test struct { |
| name string |
| want int |
| } |
| var tests = []test{ |
| {"tcp", 6}, |
| {"TcP", 6}, // case shouldn't matter |
| {"icmp", 1}, |
| {"igmp", 2}, |
| {"udp", 17}, |
| {"ipv6-icmp", 58}, |
| } |
| |
| for _, tt := range tests { |
| got, err := lookupProtocol(context.Background(), tt.name) |
| if got != tt.want || err != nil { |
| t.Errorf("LookupProtocol(%q) = %d, %v; want %d, error=nil", tt.name, got, err, tt.want) |
| } |
| } |
| |
| } |
