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syscall: make LoadConnectEx not IPv4-specific on Windows #76667

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syscall: make LoadConnectEx not IPv4-specific on Windows #76667

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15 changes: 11 additions & 4 deletions src/syscall/syscall_windows.go
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ import (
"internal/oserror"
"internal/race"
"internal/strconv"
strings "internal/stringslite"
"sync"
"unsafe"
)
Expand Down Expand Up @@ -1097,10 +1098,16 @@ var connectExFunc struct {

func LoadConnectEx() error {
connectExFunc.once.Do(func() {
var s Handle
s, connectExFunc.err = Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)
if connectExFunc.err != nil {
return
s, err := Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)
if err != nil {
// This can occur when IPv4 is disabled. See https://go.dev/issue/29759.
if strings.Index(err.Error(), "address incompatible with the requested protocol was used") >= 0 {
s, err = Socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP)
}
connectExFunc.err = err
if err != nil {
return
}
}
defer CloseHandle(s)
var n uint32
Expand Down