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server/vendor/github.com/wlynxg/anet/README.md

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+## Introduction
+In response to the modifications made to the permissions for accessing system MAC addresses in Android 11, ordinary applications encounter several main issues when using NETLINK sockets:
+
+- Not allowing bind operations on `NETLINK` sockets.
+- Not permitting the use of the `RTM_GETLINK` functionality.
+
+For detailed information, please refer to: https://developer.android.com/training/articles/user-data-ids#mac-11-plus
+
+As a result of the aforementioned reasons, using `net.Interfaces()` and `net.InterfaceAddrs()` from the Go net package in the Android environment leads to the `route ip+net: netlinkrib: permission denied` error. 
+
+You can find specific issue details here: https://github.com/golang/go/issues/40569
+
+To address the issue of using the Go net package in the Android environment, we have made partial modifications to its source code to ensure proper functionality on Android. 
+
+I have fully resolved the issues with `net.InterfaceAddrs()`. 
+
+However, for `net.Interfaces()`, we have only addressed some problems, as the following issues still remain:
+- It can only return interfaces with IP addresses.
+- It cannot return hardware MAC addresses.
+
+Nevertheless, the fixed `net.Interfaces()` function now aligns with the Android API's `NetworkInterface.getNetworkInterfaces()` and can be used normally in most scenarios.
+
+The specific fix logic includes:
+
+Removing the `Bind()` operation on `Netlink` sockets in the `NetlinkRIB()` function.
+Using `ioctl` based on the Index number returned by `RTM_GETADDR` to retrieve the network card's name, MTU, and flags.
+
+
+
+
+
+## Test Code
+### net.Interface()
+use `net.Interface()`:
+```go
+func RawInterface() {
+	interfaces, err := net.Interfaces()
+	if err != nil {
+		panic(err)
+	}
+
+	for _, i := range interfaces {
+		log.Println(i)
+	}
+}
+```
+result:
+```
+panic: route ip+net: netlinkrib: permission denied
+```
+
+use `anet.Interface()`:
+```go
+func AnetInterface() {
+	interfaces, err := anet.Interfaces()
+	if err != nil {
+		panic(err)
+	}
+
+	for _, i := range interfaces {
+		log.Println(i)
+	}
+}
+```
+
+result:
+```
+{1 65536 lo  up|loopback|running}
+{15 1400 rmnet_data1  up|running}
+{24 1500 wlan0  up|broadcast|multicast|running}
+{3 1500 dummy0  up|broadcast|running}
+{4 1500 ifb0  up|broadcast|running}
+{5 1500 ifb1  up|broadcast|running}
+{12 1500 ifb2  up|broadcast|running}
+{14 1500 rmnet_data0  up|running}
+{16 1400 rmnet_data2  up|running}
+{17 1400 rmnet_data3  up|running}
+```
+
+### net.InterfaceAddrs()
+use `net.InterfaceAddrs()`:
+```go
+func NetInterfaceAddrs() {
+	addrs, err := net.InterfaceAddrs()
+	if err != nil {
+		panic(err)
+	}
+
+	for _, addr := range addrs {
+		log.Println(addr)
+	}
+}
+```
+result: 
+```
+panic: route ip+net: netlinkrib: permission denied
+```
+
+use `anet.InterfaceAddrs()`:
+```go
+func AnetInterfaceAddrs() {
+	addrs, err := anet.InterfaceAddrs()
+	if err != nil {
+		panic(err)
+	}
+
+	for _, addr := range addrs {
+		log.Println(addr)
+	}
+}
+```
+result:
+```
+127.0.0.1/8
+::1/128
+...
+192.168.6.143/24
+fe80::7e4f:4446:eb3:1eb8/64
+```