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util/osdiag: add logging for winsock layered service providers to Windows bugreports

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The Layered Service Provider (LSP) is a deprecated (but still supported)
mechanism for inserting user-mode DLLs into a filter chain between the
Winsock API surface (ie, ws2_32.dll) and the internal user-mode interface
to the networking stack.

While their use is becoming more rare due to the aforementioned deprecation,
it is still possible for third-party software to install their DLLs into
this filter chain and interfere with Winsock API calls. Knowing whether
this is happening is useful for troubleshooting.

Fixes https://github.com/tailscale/tailscale/issues/8142

Signed-off-by: Aaron Klotz <aaron@tailscale.com>
This commit is contained in:
Aaron Klotz
2023-08-10 12:20:31 -06:00
parent 411e3364a9
commit c17a817769
3 changed files with 185 additions and 6 deletions
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3
util/osdiag/mksyscall.go
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@@ -7,3 +7,6 @@ package osdiag
//go:generate go run golang.org/x/tools/cmd/goimports -w zsyscall_windows.go
//sys regEnumValue(key registry.Key, index uint32, valueName *uint16, valueNameLen *uint32, reserved *uint32, valueType *uint32, pData *byte, cbData *uint32) (ret error) [failretval!=0] = advapi32.RegEnumValueW
//sys wscEnumProtocols(iProtocols *int32, protocolBuffer *wsaProtocolInfo, bufLen *uint32, errno *int32) (ret int32) = ws2_32.WSCEnumProtocols
//sys wscGetProviderInfo(providerId *windows.GUID, infoType _WSC_PROVIDER_INFO_TYPE, info unsafe.Pointer, infoSize *uintptr, flags uint32, errno *int32) (ret int32) = ws2_32.WSCGetProviderInfo
//sys wscGetProviderPath(providerId *windows.GUID, providerDllPath *uint16, providerDllPathLen *int32, errno *int32) (ret int32) = ws2_32.WSCGetProviderPath