2 files changed, 100 insertions, 0 deletions
diff --git a/command/guid.cpp b/command/guid.cpp
new file mode 100644
index 0000000..556484d
--- /dev/null
+++ b/command/guid.cpp
@@ -0,0 +1,79 @@
+#include "guid.hpp"
+
+#include <iostream>
+#include <sstream>
+#include <string>
+
+#include <host-ipmid/ipmid-api.h>
+#include <mapper.h>
+
+namespace command
+{
+
+std::array<uint8_t, BMC_GUID_LEN> getSystemGUID()
+{
+    // Canned System GUID for QEMU where the Chassis DBUS object is not
+    // populated
+    std::array<uint8_t, BMC_GUID_LEN> guid = { 0x01, 0x02, 0x03, 0x04,
+                                               0x05, 0x06, 0x07, 0x08,
+                                               0x09, 0x0A, 0x0B, 0x0C,
+                                               0x0D, 0x0E, 0x0F, 0x10
+                                             };
+
+    constexpr auto objname = "/org/openbmc/control/chassis0";
+    constexpr auto interface = "org.freedesktop.DBus.Properties";
+    constexpr auto chassisIntf = "org.openbmc.control.Chassis";
+
+    sd_bus_message* reply = nullptr;
+    sd_bus_error error = SD_BUS_ERROR_NULL;
+    sd_bus* bus = ipmid_get_sd_bus_connection();
+    int rc = 0;
+    char* uuid = nullptr;
+    char* busname = nullptr;
+
+    do
+    {
+        rc = mapper_get_service(bus, objname, &busname);
+        if (rc < 0)
+        {
+            std::cerr << "Failed to get " << objname << " bus name: "
+                      << strerror(-rc) << "\n";
+            break;
+        }
+
+        rc = sd_bus_call_method(bus, busname, objname, interface, "Get", &error,
+                                &reply, "ss", chassisIntf, "uuid");
+        if (rc < 0)
+        {
+            std::cerr << "Failed to call Get Method:" << strerror(-rc) << "\n";
+            break;
+        }
+
+        rc = sd_bus_message_read(reply, "v", "s", &uuid);
+        if (rc < 0 || uuid == NULL)
+        {
+            std::cerr << "Failed to get a response:" << strerror(-rc) << "\n";
+            break;
+        }
+
+        std::string readUUID(uuid);
+        auto len = readUUID.length();
+
+        for (size_t iter = 0, inc = 0;
+             iter < len && inc < BMC_GUID_LEN; iter += 2, inc++)
+        {
+            uint8_t hexVal = std::strtoul(readUUID.substr(iter, 2).c_str(),
+                                          NULL, 16);
+            guid[inc] = hexVal;
+        }
+    }
+    while (0);
+
+    sd_bus_error_free(&error);
+    reply = sd_bus_message_unref(reply);
+    free(busname);
+
+    return guid;
+}
+
+} // namespace command
diff --git a/command/guid.hpp b/command/guid.hpp
new file mode 100644
index 0000000..03c6272
--- /dev/null
+++ b/command/guid.hpp
@@ -0,0 +1,21 @@
+#pragma once
+
+#include <cstddef>
+#include <vector>
+
+#include "comm_module.hpp"
+
+namespace command
+{
+
+constexpr size_t BMC_GUID_LEN = 16;
+
+/*
+ * @brief Get System GUID
+ *
+ * @return If UUID is successfully read from the Chassis DBUS object, then the
+ *         GUID is returned, else a canned GUID is returned
+ */
+std::array<uint8_t, BMC_GUID_LEN> getSystemGUID();
+
+} // namespace command