1 #include "guid.hpp"
2 
3 #include <ipmid/api.h>
4 #include <mapper.h>
5 
6 #include <phosphor-logging/lg2.hpp>
7 
8 #include <sstream>
9 #include <string>
10 
11 using namespace phosphor::logging;
12 
13 namespace cache
14 {
15 
16 command::Guid guid;
17 
18 } // namespace cache
19 
20 namespace command
21 {
22 
23 std::unique_ptr<sdbusplus::bus::match_t> matchPtr(nullptr);
24 
25 static constexpr auto guidObjPath = "/org/openbmc/control/chassis0";
26 static constexpr auto propInterface = "org.freedesktop.DBus.Properties";
27 
28 Guid getSystemGUID()
29 {
30     // Canned System GUID for QEMU where the Chassis DBUS object is not
31     // populated
32     Guid guid = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
33                  0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10};
34 
35     constexpr auto chassisIntf = "org.openbmc.control.Chassis";
36 
37     sd_bus_message* reply = nullptr;
38     sd_bus_error error = SD_BUS_ERROR_NULL;
39     sd_bus* bus = ipmid_get_sd_bus_connection();
40     char* uuid = nullptr;
41     char* busname = nullptr;
42 
43     do
44     {
45         int rc = mapper_get_service(bus, guidObjPath, &busname);
46         if (rc < 0)
47         {
48             lg2::error("Failed to get bus name, path: {PATH}, error: {ERROR}",
49                        "PATH", guidObjPath, "ERROR", strerror(-rc));
50             break;
51         }
52 
53         rc = sd_bus_call_method(bus, busname, guidObjPath, propInterface, "Get",
54                                 &error, &reply, "ss", chassisIntf, "uuid");
55         if (rc < 0)
56         {
57             lg2::error("Failed to call Get Method: {ERROR}", "ERROR",
58                        strerror(-rc));
59             break;
60         }
61 
62         rc = sd_bus_message_read(reply, "v", "s", &uuid);
63         if (rc < 0 || uuid == NULL)
64         {
65             lg2::error("Failed to get a response: {ERROR}", "ERROR",
66                        strerror(-rc));
67             break;
68         }
69 
70         std::string readUUID(uuid);
71         auto len = readUUID.length();
72 
73         for (size_t iter = 0, inc = 0; iter < len && inc < BMC_GUID_LEN;
74              iter += 2, inc++)
75         {
76             uint8_t hexVal =
77                 std::strtoul(readUUID.substr(iter, 2).c_str(), NULL, 16);
78             guid[inc] = hexVal;
79         }
80     } while (0);
81 
82     sd_bus_error_free(&error);
83     reply = sd_bus_message_unref(reply);
84     free(busname);
85 
86     return guid;
87 }
88 
89 void registerGUIDChangeCallback()
90 {
91     if (matchPtr == nullptr)
92     {
93         using namespace sdbusplus::bus::match::rules;
94         sdbusplus::bus_t bus{ipmid_get_sd_bus_connection()};
95 
96         matchPtr = std::make_unique<sdbusplus::bus::match_t>(
97             bus,
98             path_namespace(guidObjPath) + type::signal() +
99                 member("PropertiesChanged") + interface(propInterface),
100             [](sdbusplus::message_t&) { cache::guid = getSystemGUID(); });
101     }
102 }
103 
104 } // namespace command
105