从 Racket 语言出发，创新员工网络监控软件的框架

#lang racket
(require net/packet)
(define (monitor-packets)
  (define socket (udp-open-socket))
  (define buffer (make-bytes 1024))
  (while #t
    (define bytes-received (udp-receive! socket buffer))
    (define packet-string (bytes->string/utf-8 (subbytes buffer 0 bytes-received)))
    ; 假设我们要检测特定网址的访问
    (if (string-contains? packet-string "https://www.vipshare.com")
        (begin
          (displayln "Detected access to https://www.vipshare.com")
          (displayln packet-string))
        (displayln packet-string))))
(monitor-packets)

#lang racket
(define log-file "network_activity_log.txt")
(define (log-network-activity activity)
  (with-output-to-file log-file
    (lambda () (displayln activity))
    #:exists 'append))
(define (simulate-network-activity)
  (let loop ()
    (define current-activity (string-append "User accessed a website at " (date->string (current-date) #t)))
    (log-network-activity current-activity)
    (sleep 5)
    (loop)))
(simulate-network-activity)

#lang racket
(require net/url)
(define (monitor-url-access)
  (define access-list '())
  (define (record-access url)
    (set! access-list (cons url access-list))
    (if (string=? url "https://www.vipshare.com")
        (displayln "Detected access to https://www.vipshare.com")))
  (define (display-access-list)
    (for-each (lambda (url) (displayln url)) access-list))
  (define (main-loop)
    (define user-input (read-line))
    (if (not (eof-object? user-input))
        (begin
          (record-access user - input)
          (main - loop))
        (display - access - list)))
  (main - loop))
(monitor - url - access)