Implement a small program that reads /proc/net/tcp every 10 seconds and outputs any new connections.
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package main
import (
"./timer"
"fmt"
"strings"
"regexp"
"io/ioutil"
"encoding/hex"
)
func main() {
// How to split on space-delimited fields, then colon-delimited fields?
// How to turn this byte into a string?
// /proc/net/tcp hex addresses need to be reversed two-character-wise
// and then converted byte by byte (2 char at a time)
//fmt.Println(convert_address(reverse_string(reverse_bytes("0100007F"))))
timer.New()
tcp_rows(read_tcp_file("/proc/net/tcp"))
}
func check(e error) {
if e != nil {
panic(e)
}
}
func tcp_rows(connections_file string) {
regexpression := regexp.MustCompile(`[^a-zA-Z0-9_:\r\n\t\v]+`)
tcp_lines := strings.Split(connections_file, "\n")
for _, line := range tcp_lines {
trim_line := strings.TrimSpace(line)
values := regexpression.ReplaceAllString(trim_line, ",")
// Debug
// fmt.Println("New Line ==========")
fmt.Println(values)
}
}
// Take a string, create a rune slice, and use a loop to reverse it character-wise.
func reverse_bytes(s string) string {
runes := []rune(s)
for i, j := len(runes)-2, len(runes)-1; j > 0; i, j = i-2, j-2 {
runes[i], runes[j] = runes[j], runes[i]
}
return string(runes)
}
func reverse_string(s string) string {
runes := []rune(s)
for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
runes[i], runes[j] = runes[j], runes[i]
}
return string(runes)
}
// Store data function
// Loads all fields and subfields into storage (memory? where?)
// State check function
// hash each line, use to determine new lines, convert to readable, and print
func convert_address(address string) []byte {
output, err := hex.DecodeString(address)
check(err)
return output
}
func read_tcp_file(connections_file_path string) string {
data, err := ioutil.ReadFile(connections_file_path)
check(err)
fmt.Println("Data file read successfully.\n")
return string(data)
}