1 #include "guid.hpp"
2 
3 #include <ipmid/api.h>
4 #include <mapper.h>
5 
6 #include <phosphor-logging/log.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             log<level::ERR>("Failed to get bus name",
49                             entry("PATH=%s", guidObjPath),
50                             entry("ERROR=%s", strerror(-rc)));
51             break;
52         }
53 
54         rc = sd_bus_call_method(bus, busname, guidObjPath, propInterface, "Get",
55                                 &error, &reply, "ss", chassisIntf, "uuid");
56         if (rc < 0)
57         {
58             log<level::ERR>("Failed to call Get Method",
59                             entry("ERROR=%s", strerror(-rc)));
60             break;
61         }
62 
63         rc = sd_bus_message_read(reply, "v", "s", &uuid);
64         if (rc < 0 || uuid == NULL)
65         {
66             log<level::ERR>("Failed to get a response",
67                             entry("ERROR=%s", strerror(-rc)));
68             break;
69         }
70 
71         std::string readUUID(uuid);
72         auto len = readUUID.length();
73 
74         for (size_t iter = 0, inc = 0; iter < len && inc < BMC_GUID_LEN;
75              iter += 2, inc++)
76         {
77             uint8_t hexVal =
78                 std::strtoul(readUUID.substr(iter, 2).c_str(), NULL, 16);
79             guid[inc] = hexVal;
80         }
81     } while (0);
82 
83     sd_bus_error_free(&error);
84     reply = sd_bus_message_unref(reply);
85     free(busname);
86 
87     return guid;
88 }
89 
90 void registerGUIDChangeCallback()
91 {
92     if (matchPtr == nullptr)
93     {
94         using namespace sdbusplus::bus::match::rules;
95         sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};
96 
97         matchPtr = std::make_unique<sdbusplus::bus::match_t>(
98             bus,
99             path_namespace(guidObjPath) + type::signal() +
100                 member("PropertiesChanged") + interface(propInterface),
101             [](sdbusplus::message::message&) {
102                 cache::guid = getSystemGUID();
103             });
104     }
105 }
106 
107 } // namespace command
108