diff --git a/ipmi.cpp b/ipmi.cpp
new file mode 100644
index 0000000..8ee9c42
--- /dev/null
+++ b/ipmi.cpp
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ipmi.hpp"
+
+#include "cable.hpp"
+#include "cpld.hpp"
+#include "entity_name.hpp"
+#include "eth.hpp"
+#include "handler_impl.hpp"
+#include "pcie_i2c.hpp"
+#include "psu.hpp"
+
+#include <ipmid/api.h>
+
+#include <cstdint>
+#include <cstdio>
+
+namespace google
+{
+namespace ipmi
+{
+
+ipmi_ret_t handleSysCommand(HandlerInterface* handler, ipmi_cmd_t cmd,
+                            const uint8_t* reqBuf, uint8_t* replyCmdBuf,
+                            size_t* dataLen)
+{
+    // Verify it's at least as long as it needs to be for a subcommand.
+    if ((*dataLen) < 1)
+    {
+        std::fprintf(stderr, "*dataLen too small: %u\n",
+                     static_cast<uint32_t>(*dataLen));
+        return IPMI_CC_REQ_DATA_LEN_INVALID;
+    }
+
+    switch (reqBuf[0])
+    {
+        case SysCableCheck:
+            return cableCheck(reqBuf, replyCmdBuf, dataLen, handler);
+        case SysCpldVersion:
+            return cpldVersion(reqBuf, replyCmdBuf, dataLen, handler);
+        case SysGetEthDevice:
+            return getEthDevice(reqBuf, replyCmdBuf, dataLen, handler);
+        case SysPsuHardReset:
+            return psuHardReset(reqBuf, replyCmdBuf, dataLen, handler);
+        case SysPcieSlotCount:
+            return pcieSlotCount(reqBuf, replyCmdBuf, dataLen, handler);
+        case SysPcieSlotI2cBusMapping:
+            return pcieSlotI2cBusMapping(reqBuf, replyCmdBuf, dataLen, handler);
+        case SysEntityName:
+            return getEntityName(reqBuf, replyCmdBuf, dataLen, handler);
+        default:
+            std::fprintf(stderr, "Invalid subcommand: 0x%x\n", reqBuf[0]);
+            return IPMI_CC_INVALID;
+    }
+}
+
+} // namespace ipmi
+} // namespace google