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