BlueZ：通过它的mac地址获取设备名称

Question

背景：我正在研究iOS设备和嵌入式Linux板之间的OOB配对（通过USB）。目前，在Linux方面，我收到了蓝牙链接密钥（未来连接需要）以及mac地址。
ps：如果你对这个主题很熟悉 - 请看this question。

我当前实现，使用MAC地址作为设备的名称（详情 - 见链接到上面的问题），这是正在第二bluetoothd服务重新启动之后解决。

问题：有没有办法让拥有它的Mac只中的BlueZ帮助设备的蓝牙名称？我将在C代码中使用它来访问BlueZ的DBus接口。

Answer 1

AFAIK，没有直接的前向DBus API或从MAC地址查找名称的方法。但是这可以使用设备的“org.freedesktop.DBus.Properties”界面中的“GetManagedObjects”方法完成。

下面是伪代码，如果添加了适当的错误处理和变量，它应该可以工作。 DBus XML被添加到源代码的顶部以供参考。

#if 0 
dbus-send --system --dest=org.bluez --type=method_call --print-reply /org/bluez/hci0/dev_44_D8_84_02_A3_17 org.freedesktop.DBus.Introspectable.Introspect 
method return sender=:1.1 -> dest=:1.7 reply_serial=2 
    string "<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN" 
"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd"> 
<node> 
    <interface name="org.freedesktop.DBus.Introspectable"> 
     <method name="Introspect"> 
      <arg name="xml" type="s" direction="out"/> 
     </method> 
    </interface> 
    <interface name="org.bluez.Device1"> 
     <method name="Disconnect"></method> 
     <method name="Connect"></method> 
     <method name="ConnectProfile"> 
      <arg name="UUID" type="s" direction="in"/> 
     </method> 
     <method name="DisconnectProfile"> 
      <arg name="UUID" type="s" direction="in"/> 
     </method> 
     <method name="Pair"></method> 
     <method name="CancelPairing"></method> 

     <property name="Address" type="s" access="read"></property> 
     <property name="Name" type="s" access="read"></property> 
     <property name="Alias" type="s" access="readwrite"></property> 
     <property name="Class" type="u" access="read"></property> 
     <property name="Appearance" type="q" access="read"></property> 
     <property name="Icon" type="s" access="read"></property> 
     <property name="Paired" type="b" access="read"></property> 
     <property name="Trusted" type="b" access="readwrite"></property> 
     <property name="Blocked" type="b" access="readwrite"></property> 
     <property name="LegacyPairing" type="b" access="read"></property> 
     <property name="RSSI" type="n" access="read"></property> 
     <property name="Connected" type="b" access="read"></property> 
     <property name="UUIDs" type="as" access="read"></property> 
     <property name="Modalias" type="s" access="read"></property> 
     <property name="Adapter" type="o" access="read"></property> 
    </interface> 
    <interface name="org.freedesktop.DBus.Properties"> 
     <method name="Get"> 
      <arg name="interface" type="s" direction="in"/> 
      <arg name="name" type="s" direction="in"/> 
      <arg name="value" type="v" direction="out"/> 
     </method> 
     <method name="Set"> 
      <arg name="interface" type="s" direction="in"/> 
      <arg name="name" type="s" direction="in"/> 
      <arg name="value" type="v" direction="in"/> 
     </method> 
     <method name="GetAll"> 
      <arg name="interface" type="s" direction="in"/> 
      <arg name="properties" type="a{sv}" direction="out"/> 
     </method> 
     <signal name="PropertiesChanged"> 
      <arg name="interface" type="s"/> 
      <arg name="changed_properties" type="a{sv}"/> 
      <arg name="invalidated_properties" type="as"/> 
     </signal> 
    </interface> 
<node name="player0"/></node>" 
#endif 
#define BT_BLUEZ_NAME "org.bluez" 
#define BT_MANAGER_PATH "/" 
#define BT_ADAPTER_INTERFACE "org.bluez.Adapter1" 
#define BT_DEVICE_IFACE  "org.bluez.Device1" 
#define BT_MANAGER_INTERFACE "org.freedesktop.DBus.ObjectManager" 
#define BT_PROPERTIES_INTERFACE "org.freedesktop.DBus.Properties" 

int main(void) 
{ 
    char *known_address = "2C:F0:A2:26:D7:F5"; /*This is your address to search */ 

     conn = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &error); 
     proxy = g_dbus_proxy_new_sync(conn, G_DBUS_PROXY_FLAGS_NONE, NULL, BT_BLUEZ_NAME, BT_MANAGER_PATH, BT_MANAGER_INTERFACE, NULL, &err); 
     result = g_dbus_proxy_call_sync(proxy, "GetManagedObjects", NULL, G_DBUS_CALL_FLAGS_NONE, -1, NULL, &err); 

    g_variant_get(result, "(a{oa{sa{sv}}})", &iter); 

     char *device_path = NULL; 
     char device_address[18] = { 0 }; 
     /* Parse the signature: oa{sa{sv}}} */ 
     while (g_variant_iter_loop(iter, "{&oa{sa{sv}}}", &device_path, NULL)) { 
     { 
      char address[BT_ADDRESS_STRING_SIZE] = { 0 }; 
      char *dev_addr; 

      dev_addr = strstr(device_path, "dev_"); 
      if (dev_addr != NULL) { 
       char *pos = NULL; 
       dev_addr += 4; 
       g_strlcpy(address, dev_addr, sizeof(address)); 

       while ((pos = strchr(address, '_')) != NULL) { 
        *pos = ':'; 
       } 

       g_strlcpy(device_address, address, BT_ADDRESS_STRING_SIZE); 
      } 

     } 

     if (g_strcmp0(known_address, device_address) == 0) { 
      /* Find the name of the device */ 
      device_property_proxy = g_dbus_proxy_new_sync(conn, G_DBUS_PROXY_FLAGS_NONE, NULL, BT_BLUEZ_NAME, &device_path, BT_PROPERTIES_INTERFACE, NULL, NULL); 
      result = g_dbus_proxy_call_sync(proxy, "Get", g_variant_new("(ss)", BT_DEVICE_IFACE, "Alias"), G_DBUS_CALL_FLAGS_NONE, -1, NULL, &error); 

      const char *local = NULL; 
      g_variant_get(result, "(v)", &temp); 
      local = g_variant_get_string(temp, NULL); 
      printf("Your desired name : %s\n", local); 
     } 
     } 
}