[Linux] hostapd create nelink socket和kernel driver溝通

1. static struct nl_sock * nl_create_handle(struct nl_cb *cb, const char *dbg)

2. struct nl_sock *nl_socket_alloc_cb(struct nl_cb *cb)

  a. calloc struct cb memory area

  b. 建立pid s_local.nl_pid = generate_local_port(); //取process id作為pid

3. 在此建立socket和bind
int genl_connect(struct nl_sock *sk)

  a. sk->s_fd = socket(AF_NETLINK, SOCK_RAW | flags, protocol);

  b. bind(sk->s_fd, (struct sockaddr*) &sk->s_local, sizeof(sk->s_local));

[常識] 實用line群

Canon相機聊天室
https://line.me/ti/g2/4Ot1c5oiyD5M4Yq33ekyqi0euN7JkDHyUcxuPQ?utm_source=invitation&utm_medium=link_copy&utm_campaign=default


馬祖藍眼淚
https://line.me/ti/g2/xRKpLtU3azxxTbtkmbtdzbImL5x6UiE_zUMasg?utm_source=invitation&utm_medium=link_copy&utm_campaign=default

BSSID

BSSID: WiFi AP的MAC Address.

SSID: WiFi AP beacon發出來的名字,就是在wifi收尋選單看到的名字.

[網路] 如何判斷WPA3 SAE和WPA2 PSK/WPA3 SAE mix mode

主要是看beacon的RSN information tag

根據chatgpt解說

Identifying WPA2 vs. WPA3

• WPA2: The AKM suite typically includes entries such as 00-0F-AC-1 (PSK) or 00-0F-AC-2 (802.1X).
• WPA3: The AKM suite for WPA3 will include:
• SAE (Simultaneous Authentication of Equals): 00-0F-AC-8, indicating WPA3-Personal.
• Suite B: 00-0F-AC-9, indicating WPA3-Enterprise, often used with 192-bit cryptographic strength

[Linux] fclose close /proc下檔案導致當機

/proc is a virtual file system

 

//From chatgpt  
在 Linux 中,/proc 文件系統是一個虛擬文件系統,提供了訪問內核數據結構的接口,/proc 下的文件並不是真正的磁盤文件,而是由內核動態生成的,這些文件的行為可能與普通文件有所不同，尤其是在處理方式上.

在/proc除了是虛擬文件系統,裡面的檔案可能有其他process matain,也就是說有其他process 在操作此檔案,那fclose就可以free到錯誤的memory address

有時候在/proc的檔案大小還會是0

如果要讀取fopen /proc下檔案,把它導到 /tmp下再操作,即可避免當機問題.

[OpenWRT] Missing lto (liblto_plugin.so)

1. 少了lto
plugin needed to handle lto object
這其實是一個error,但卻沒顯示error,還把.a建出來,他的意思是組libubusd_library.a時找不到liblto_plugin.so

[ 62%] Linking C static library libubusd_library.a
toolchain-aarch64_xxx/bin/aarch64-openwrt-linux-ar: CMakeFiles/ubusd_library.dir/ubusd.c.o: plugin needed to handle lto object
toolchain-aarch64_xxx/bin/aarch64-openwrt-linux-ar: CMakeFiles/ubusd_library.dir/ubusd_proto.c.o: plugin needed to handle lto object
toolchain-aarch64_xxx/bin/aarch64-openwrt-linux-ar: CMakeFiles/ubusd_library.dir/ubusd_id.c.o: plugin needed to handle lto object

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