西维蜀黍

【Network】tcpdump 抓包

OpenWrt安装

$ opkg update && opkg install tcpdump

Usage

默认启动

$ tcpdump

普通情况下，直接启动tcpdump将监视第一个网络接口上所有流过的数据包。

# get list of interfaces
$ ifconfig

# do tcpdump on lan interface 'br-lan'
$ tcpdump -i br-lan -n

# dump for http traffic
$ tcpdump -i br-lan port 80

# dump for ssh traffic on wan, but do not show self
$ tcpdump -i eth0 port 22 and not host 192.168.1.7
  ...

Posted by Wei on 2020-06-20, Last Modified on 2025-04-23

【Linux】修改 MAC 地址

Linux

获取mac地址

$ ip link show
enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
 link/ether 08:xx:xx:xx:xx:x1 brd ff:ff:ff:ff:ff:ff

或者：

$ ifconfig | grep HWaddr
enp0s3    Link encap:Ethernet  HWaddr 08:xx:xx:xx:xx:x1
  ...

Posted by Wei on 2020-06-20, Last Modified on 2025-04-23

【OpenWrt】macOS 下小米红米路由器 AC2100 （Xiaomi Redmi Router AC2100） 刷 OpenWrt

Preparation

相关工具安装

$ brew install netcat
$ pip3 install scapy

下载 busybox 和固件

$ wget https://busybox.net/downloads/binaries/1.31.0-defconfig-multiarch-musl/busybox-mipsel -o busybox-mipsel

$ wget https://downloads.openwrt.org/snapshots/targets/ramips/mt7621/openwrt-ramips-mt7621-xiaomi_redmi-router-ac2100-squashfs-kernel1.bin -o openwrt-ramips-mt7621-xiaomi_redmi-router-ac2100-squashfs-kernel1.bin
$ wget https://downloads.openwrt.org/snapshots/targets/ramips/mt7621/openwrt-ramips-mt7621-xiaomi_redmi-router-ac2100-squashfs-rootfs0.bin -o openwrt-ramips-mt7621-xiaomi_redmi-router-ac2100-squashfs-rootfs0.bin

# download the latest version from https://downloads.openwrt.org/releases/, e.g., https://downloads.openwrt.org/releases/23.05.2/targets/ramips/mt7621/
  ...

Posted by Wei on 2020-06-20, Last Modified on 2024-05-07

【Golang】Golang 遍历 map 时 key 随机化问题（Interation Order）

Context

package main

import (
	"fmt"
)

func main() {
	x := make(map[int]int)
	for i := 0; i < 30; i++ {
		x[i] = i
	}

	for i := 0; i < 10; i++ {
		for k, v := range x {
			fmt.Println(k, v)
			break
		}
	}
}

// output 
18 18
29 29
2 2
2 2
2 2
16 16
28 28
1 1
0 0
4 4

可以看到，我们进行10次遍历 map，每次遍历都只print 出第一对key-value pair，而每次遍历 print 的结果都不同。

  ...

Posted by Wei on 2020-06-14, Last Modified on 2025-04-23

【hexo】使用 node 14 运行 hexo 报错

Situation

$ hexo g
FATAL Something's wrong. Maybe you can find the solution here: https://hexo.io/docs/troubleshooting.html
TypeError [ERR_INVALID_ARG_TYPE]: The "mode" argument must be integer. Received an instance of Object
    at copyFile (fs.js:1895:10)
    at tryCatcher (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/util.js:16:23)
    at ret (eval at makeNodePromisifiedEval (/usr/local/lib/node_modules/hexo-cli/node_modules/bluebird/js/release/promisify.js:184:12), <anonymous>:13:39)
    at /SW/myBlog/node_modules/hexo-deployer-git/node_modules/hexo-fs/lib/fs.js:144:39
    at tryCatcher (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:517:31)
    at Promise._settlePromise (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:574:18)
    at Promise._settlePromise0 (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:619:10)
    at Promise._settlePromises (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:699:18)
    at Promise._fulfill (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:643:18)
    at Promise._resolveCallback (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:437:57)
    at Promise._settlePromiseFromHandler (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:529:17)
    at Promise._settlePromise (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:574:18)
    at Promise._settlePromise0 (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:619:10)
    at Promise._settlePromises (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:699:18)
    at Promise._fulfill (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:643:18)
    at Promise._resolveCallback (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:437:57)
    at Promise._settlePromiseFromHandler (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:529:17)
    at Promise._settlePromise (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:574:18)
    at Promise._settlePromise0 (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:619:10)
    at Promise._settlePromises (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:699:18)
    at Promise._fulfill (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:643:18)
    at Promise._resolveCallback (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:437:57)
    at Promise._settlePromiseFromHandler (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:529:17)
    at Promise._settlePromise (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:574:18)
    at Promise._settlePromise0 (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:619:10)
    at Promise._settlePromises (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:699:18)
    at Promise._fulfill (/SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/promise.js:643:18)
    at /SW/myBlog/node_modules/hexo-deployer-git/node_modules/bluebird/js/release/nodeback.js:42:21
    at FSReqCallback.oncomplete (fs.js:163:23)
  ...

Posted by Wei on 2020-06-13, Last Modified on 2025-04-23

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