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     char* uuid = nullptr;
38     char* busname = nullptr;
39 
40     do
41     {
42         int rc = mapper_get_service(bus, guidObjPath, &busname);
43         if (rc < 0)
44         {
45             std::cerr << "Failed to get " << guidObjPath
46                       << " bus name: " << strerror(-rc) << "\n";
47             break;
48         }
49 
50         rc = sd_bus_call_method(bus, busname, guidObjPath, propInterface, "Get",
51                                 &error, &reply, "ss", chassisIntf, "uuid");
52         if (rc < 0)
53         {
54             std::cerr << "Failed to call Get Method:" << strerror(-rc) << "\n";
55             break;
56         }
57 
58         rc = sd_bus_message_read(reply, "v", "s", &uuid);
59         if (rc < 0 || uuid == NULL)
60         {
61             std::cerr << "Failed to get a response:" << strerror(-rc) << "\n";
62             break;
63         }
64 
65         std::string readUUID(uuid);
66         auto len = readUUID.length();
67 
68         for (size_t iter = 0, inc = 0; iter < len && inc < BMC_GUID_LEN;
69              iter += 2, inc++)
70         {
71             uint8_t hexVal =
72                 std::strtoul(readUUID.substr(iter, 2).c_str(), NULL, 16);
73             guid[inc] = hexVal;
74         }
75     } while (0);
76 
77     sd_bus_error_free(&error);
78     reply = sd_bus_message_unref(reply);
79     free(busname);
80 
81     return guid;
82 }
83 
84 void registerGUIDChangeCallback()
85 {
86     if (matchPtr == nullptr)
87     {
88         using namespace sdbusplus::bus::match::rules;
89         sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};
90 
91         matchPtr = std::make_unique<sdbusplus::bus::match_t>(
92             bus,
93             path_namespace(guidObjPath) + type::signal() +
94                 member("PropertiesChanged") + interface(propInterface),
95             [](sdbusplus::message::message&) {
96                 cache::guid = getSystemGUID();
97             });
98     }
99 }
100 
101 } // namespace command
102