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TAP driver requires input and output buffers for calls passed into DeviceIoControl

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Otherwise the driver returns STATUS_INVALID_PARAMETER and the call fails.  This should fix some Multicast issues on Windows
This commit is contained in:
Grant Limberg 2018-02-23 13:42:02 -08:00
parent e3bb67d188
commit 2ee358dbfc
1 changed files with 1 additions and 1 deletions
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2
osdep/WindowsEthernetTap.cpp
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@ -841,7 +841,7 @@ void WindowsEthernetTap::scanMulticastGroups(std::vector<MulticastGroup> &added,
// pretty much anything work... IPv4, IPv6, IPX, oldskool Netbios, who knows... // pretty much anything work... IPv4, IPv6, IPX, oldskool Netbios, who knows...
unsigned char mcastbuf[TAP_WIN_IOCTL_GET_MULTICAST_MEMBERSHIPS_OUTPUT_BUF_SIZE]; unsigned char mcastbuf[TAP_WIN_IOCTL_GET_MULTICAST_MEMBERSHIPS_OUTPUT_BUF_SIZE];
DWORD bytesReturned = 0; DWORD bytesReturned = 0;
if (DeviceIoControl(t,TAP_WIN_IOCTL_GET_MULTICAST_MEMBERSHIPS,(LPVOID)0,0,(LPVOID)mcastbuf,sizeof(mcastbuf),&bytesReturned,NULL)) { if (DeviceIoControl(t,TAP_WIN_IOCTL_GET_MULTICAST_MEMBERSHIPS,(LPVOID)mcastbuf,sizeof(mcastbuf),(LPVOID)mcastbuf,sizeof(mcastbuf),&bytesReturned,NULL)) {
if ((bytesReturned > 0)&&(bytesReturned <= TAP_WIN_IOCTL_GET_MULTICAST_MEMBERSHIPS_OUTPUT_BUF_SIZE)) { // sanity check if ((bytesReturned > 0)&&(bytesReturned <= TAP_WIN_IOCTL_GET_MULTICAST_MEMBERSHIPS_OUTPUT_BUF_SIZE)) { // sanity check
MAC mac; MAC mac;
DWORD i = 0; DWORD i = 0;