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https://github.com/spice2x/spice2x.github.io.git
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drmext
5bec3d5db7
## Link to GitHub Issue or related Pull Request, if one exists #0 ## Description of change Add `-icmphook` option under spicecfg Development/Network for emulating keepalive ping replies in user mode, so games do not need to open privileged raw ICMP sockets. This makes connecting to networks possible on macOS under Whisky, and on Windows with ICMP firewalled or spice running without Administrator privileges. ## Testing Tested DDR and SDVX on Windows 10 and macOS Tahoe. Network check status in test menu shows `CONNECTED` when -icmphook is enabled, and `NOT CONNECTED` when it is disabled. Actual network functionality works as expected (under previously impossible conditions).
95 lines
2.4 KiB
C++
95 lines
2.4 KiB
C++
#include <winsock2.h>
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#include <windows.h>
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#include <iptypes.h>
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#include <iphlpapi.h>
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#include <icmpapi.h>
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#include <algorithm>
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#include <cstddef>
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#include <cstring>
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#include "util/detour.h"
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#include "util/logging.h"
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namespace {
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#pragma pack(push, 1)
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struct IcmpHdr {
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uint8_t type;
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uint8_t code;
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uint16_t checksum_be;
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};
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#pragma pack(pop)
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decltype(IcmpSendEcho) *IcmpSendEcho_orig = nullptr;
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DWORD WINAPI IcmpSendEcho_hook(
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HANDLE IcmpHandle,
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IPAddr DestinationAddress,
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LPVOID RequestData,
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WORD RequestSize,
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PIP_OPTION_INFORMATION RequestOptions,
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LPVOID ReplyBuffer,
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DWORD ReplySize,
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DWORD Timeout) {
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if (!IcmpSendEcho_orig) {
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SetLastError(ERROR_INVALID_FUNCTION);
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return 0;
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}
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DWORD n = IcmpSendEcho_orig(
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IcmpHandle,
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DestinationAddress,
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RequestData,
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RequestSize,
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RequestOptions,
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ReplyBuffer,
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ReplySize,
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Timeout);
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if (n != 0) {
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return n;
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}
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if (ReplyBuffer == nullptr || ReplySize < sizeof(ICMP_ECHO_REPLY) || RequestData == nullptr) {
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return 0;
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}
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if (RequestSize < sizeof(IcmpHdr)) {
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return 0;
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}
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const auto *req = reinterpret_cast<const uint8_t *>(RequestData);
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const auto *ih = reinterpret_cast<const IcmpHdr *>(req);
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if (ih->type != 8 || ih->code != 0) {
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return 0;
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}
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memset(ReplyBuffer, 0, ReplySize);
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auto *reply = reinterpret_cast<ICMP_ECHO_REPLY *>(ReplyBuffer);
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const size_t data_off = offsetof(ICMP_ECHO_REPLY, Data);
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const size_t avail = ReplySize > data_off ? ReplySize - data_off : 0;
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const size_t copy_len = (std::min)(static_cast<size_t>(RequestSize), avail);
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reply->Address = DestinationAddress;
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reply->Status = IP_SUCCESS;
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reply->RoundTripTime = 1;
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reply->DataSize = static_cast<USHORT>(copy_len);
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if (copy_len > 0) {
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memcpy(reinterpret_cast<uint8_t *>(ReplyBuffer) + data_off, RequestData, copy_len);
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}
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SetLastError(ERROR_SUCCESS);
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return 1;
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}
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} // namespace
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void icmphook_iphlpapi_install() {
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static bool done = false;
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if (done) {
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return;
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}
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done = true;
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if (!detour::trampoline_try(
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"iphlpapi.dll",
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"IcmpSendEcho",
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(void *) IcmpSendEcho_hook,
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(void **) &IcmpSendEcho_orig)) {
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log_warning("network", "ICMP emulation: IcmpSendEcho hook was not installed");
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}
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}
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