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opt
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golang
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1.19.4
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src
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net
Server IP: 191.96.63.230
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Size
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..
-
12/01/2022 06:13:58 PM
rwxr-xr-x
📄
addrselect.go
9.44 KB
12/01/2022 06:12:59 PM
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📄
addrselect_test.go
6.22 KB
12/01/2022 06:12:59 PM
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cgo_aix.go
582 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
cgo_android.go
272 bytes
12/01/2022 06:12:59 PM
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cgo_bsd.go
353 bytes
12/01/2022 06:12:59 PM
rw-r--r--
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cgo_linux.go
642 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
cgo_netbsd.go
276 bytes
12/01/2022 06:12:59 PM
rw-r--r--
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cgo_openbsd.go
276 bytes
12/01/2022 06:12:59 PM
rw-r--r--
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cgo_resnew.go
590 bytes
12/01/2022 06:12:59 PM
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cgo_resold.go
579 bytes
12/01/2022 06:12:59 PM
rw-r--r--
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cgo_socknew.go
753 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
cgo_sockold.go
852 bytes
12/01/2022 06:12:59 PM
rw-r--r--
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cgo_solaris.go
343 bytes
12/01/2022 06:12:59 PM
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cgo_stub.go
1.03 KB
12/01/2022 06:12:59 PM
rw-r--r--
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cgo_unix.go
9.49 KB
12/01/2022 06:12:59 PM
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📄
cgo_unix_test.go
1.84 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
cgo_windows.go
402 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
conf.go
9.65 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
conf_netcgo.go
370 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
conf_test.go
9.7 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
conn_test.go
1.73 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
dial.go
22.73 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
dial_test.go
26.1 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
dial_unix_test.go
2.77 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
dnsclient.go
5.57 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
dnsclient_test.go
1.51 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
dnsclient_unix.go
22.72 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
dnsclient_unix_test.go
57.08 KB
12/01/2022 06:12:59 PM
rw-r--r--
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dnsconfig.go
1.61 KB
12/01/2022 06:12:59 PM
rw-r--r--
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dnsconfig_unix.go
4.01 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
dnsconfig_unix_test.go
6.69 KB
12/01/2022 06:12:59 PM
rw-r--r--
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dnsconfig_windows.go
1.42 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
dnsname_test.go
1.98 KB
12/01/2022 06:12:59 PM
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📄
error_plan9.go
224 bytes
12/01/2022 06:12:59 PM
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📄
error_plan9_test.go
476 bytes
12/01/2022 06:12:59 PM
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📄
error_posix.go
542 bytes
12/01/2022 06:12:59 PM
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📄
error_posix_test.go
981 bytes
12/01/2022 06:12:59 PM
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📄
error_test.go
19.72 KB
12/01/2022 06:12:59 PM
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error_unix.go
372 bytes
12/01/2022 06:12:59 PM
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📄
error_unix_test.go
762 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
error_windows.go
355 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
error_windows_test.go
796 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
example_test.go
8.45 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
external_test.go
4.07 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
fcntl_libc_test.go
374 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
fcntl_syscall_test.go
496 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
fd_plan9.go
3.56 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
fd_posix.go
4.29 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
fd_unix.go
5.37 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
fd_windows.go
4.62 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
file.go
1.69 KB
12/01/2022 06:12:59 PM
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📄
file_plan9.go
2.68 KB
12/01/2022 06:12:59 PM
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file_stub.go
489 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
file_test.go
6.38 KB
12/01/2022 06:12:59 PM
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📄
file_unix.go
2.46 KB
12/01/2022 06:12:59 PM
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📄
file_windows.go
521 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
hook.go
628 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
hook_plan9.go
283 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
hook_unix.go
690 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
hook_windows.go
875 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
hosts.go
3.02 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
hosts_test.go
4.58 KB
12/01/2022 06:12:59 PM
rw-r--r--
📁
http
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12/01/2022 06:13:56 PM
rwxr-xr-x
📄
interface.go
7.17 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_aix.go
4.4 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_bsd.go
2.76 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_bsd_test.go
1.44 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_bsdvar.go
718 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_darwin.go
1.29 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_freebsd.go
1.29 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_linux.go
6.9 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_linux_test.go
3.65 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_plan9.go
4.68 KB
12/01/2022 06:12:59 PM
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📄
interface_solaris.go
2.07 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_stub.go
812 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_test.go
9.67 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_unix_test.go
4.73 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
interface_windows.go
5.41 KB
12/01/2022 06:12:59 PM
rw-r--r--
📁
internal
-
12/01/2022 06:13:56 PM
rwxr-xr-x
📄
ip.go
17.72 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
ip_test.go
25.33 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
iprawsock.go
7.08 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
iprawsock_plan9.go
874 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
iprawsock_posix.go
3.41 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
iprawsock_test.go
5.62 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
ipsock.go
8.97 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
ipsock_plan9.go
7.5 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
ipsock_plan9_test.go
645 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
ipsock_posix.go
7.66 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
ipsock_test.go
6.81 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
listen_test.go
20.51 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
lookup.go
27.82 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
lookup_fake.go
1.64 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
lookup_plan9.go
8.86 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
lookup_test.go
35.13 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
lookup_unix.go
4.46 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
lookup_windows.go
12.53 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
lookup_windows_test.go
8.5 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
mac.go
1.88 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
mac_test.go
3.26 KB
12/01/2022 06:12:59 PM
rw-r--r--
📁
mail
-
12/01/2022 06:13:56 PM
rwxr-xr-x
📄
main_cloexec_test.go
693 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
main_conf_test.go
922 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
main_noconf_test.go
505 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
main_plan9_test.go
392 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
main_posix_test.go
1.38 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
main_test.go
7.08 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
main_unix_test.go
1.19 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
main_windows_test.go
1.08 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
mockserver_test.go
10.79 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
net.go
23.25 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
net_fake.go
6.59 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
net_test.go
13.88 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
net_windows_test.go
16.28 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
netgo.go
427 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
netgo_unix_test.go
656 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📁
netip
-
12/01/2022 06:13:56 PM
rwxr-xr-x
📄
nss.go
3.64 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
nss_test.go
3.35 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
packetconn_test.go
3.03 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
parse.go
7.06 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
parse_test.go
1.46 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
pipe.go
5.43 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
pipe_test.go
1.2 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
platform_test.go
4.57 KB
12/01/2022 06:12:59 PM
rw-r--r--
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port.go
1.46 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
port_test.go
1.34 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
port_unix.go
1.24 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
protoconn_test.go
7.19 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
rawconn.go
1.89 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
rawconn_stub_test.go
631 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
rawconn_test.go
4.32 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
rawconn_unix_test.go
2.96 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
rawconn_windows_test.go
3.12 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
resolverdialfunc_test.go
8.29 KB
12/01/2022 06:12:59 PM
rw-r--r--
📁
rpc
-
12/01/2022 06:13:56 PM
rwxr-xr-x
📄
sendfile_linux.go
1.1 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sendfile_stub.go
344 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
sendfile_test.go
6.72 KB
12/01/2022 06:12:59 PM
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sendfile_unix_alt.go
2.01 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sendfile_windows.go
1.02 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
server_test.go
11.01 KB
12/01/2022 06:12:59 PM
rw-r--r--
📁
smtp
-
12/01/2022 06:13:56 PM
rwxr-xr-x
📄
sock_bsd.go
918 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
sock_cloexec.go
741 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
sock_linux.go
1.53 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sock_linux_test.go
545 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
sock_plan9.go
262 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
sock_posix.go
6.78 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sock_stub.go
390 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
sock_windows.go
1.16 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockaddr_posix.go
914 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockopt_aix.go
1.43 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockopt_bsd.go
2.21 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockopt_linux.go
1.25 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockopt_plan9.go
406 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockopt_posix.go
2.62 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockopt_solaris.go
1.25 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockopt_stub.go
742 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockopt_windows.go
1.51 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockoptip_bsdvar.go
867 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockoptip_linux.go
735 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockoptip_posix.go
1.38 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockoptip_stub.go
767 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
sockoptip_windows.go
819 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
splice_linux.go
1.09 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
splice_stub.go
287 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
splice_test.go
10.05 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
sys_cloexec.go
962 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsock.go
10.61 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsock_plan9.go
2.21 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsock_posix.go
5.31 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsock_test.go
17.32 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsock_unix_test.go
2.35 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsockopt_darwin.go
770 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsockopt_dragonfly.go
698 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsockopt_openbsd.go
365 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsockopt_plan9.go
525 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsockopt_posix.go
442 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsockopt_solaris.go
1.15 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsockopt_stub.go
397 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsockopt_unix.go
722 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
tcpsockopt_windows.go
741 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📁
testdata
-
12/01/2022 06:13:56 PM
rwxr-xr-x
📁
textproto
-
12/01/2022 06:13:56 PM
rwxr-xr-x
📄
timeout_test.go
28.56 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
udpsock.go
11.83 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
udpsock_plan9.go
4.64 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
udpsock_plan9_test.go
1.31 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
udpsock_posix.go
6.78 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
udpsock_test.go
16.29 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
unixsock.go
10.17 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
unixsock_linux_test.go
2.29 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
unixsock_plan9.go
1.24 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
unixsock_posix.go
5.87 KB
12/01/2022 06:12:59 PM
rw-r--r--
📄
unixsock_readmsg_cloexec.go
654 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
unixsock_readmsg_cmsg_cloexec.go
332 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
unixsock_readmsg_other.go
275 bytes
12/01/2022 06:12:59 PM
rw-r--r--
📄
unixsock_readmsg_test.go
2.48 KB
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unixsock_test.go
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unixsock_windows_test.go
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write_unix_test.go
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writev_test.go
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writev_unix.go
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Editing: cgo_unix.go
Close
// 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 && unix 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(string(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 }