/
main.go
61 lines (48 loc) · 1 KB
/
main.go
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package main
import (
"bufio"
"flag"
"fmt"
"net"
"os"
"regexp"
"time"
)
func checkError(err error) {
if err != nil {
fmt.Printf("Error: %s\n", err)
os.Exit(1)
}
}
func main() {
timeout := flag.Int("t", 10, "set a timeout in seconds for the read")
listen := flag.Bool("l", false, "start a listener instead of a dial")
flag.Parse()
if len(flag.Args()) < 3 {
fmt.Printf("USAGE: %s <regex> <host> <port>\n", os.Args[0])
}
term := flag.Args()[0]
host := flag.Args()[1]
port := flag.Args()[2]
target := fmt.Sprintf("%s:%s", host, port)
var con net.Conn
if *listen {
list, err := net.Listen("tcp", target)
checkError(err)
ncon, err := list.Accept()
checkError(err)
con = ncon
} else {
ncon, err := net.Dial("tcp", target)
checkError(err)
con = ncon
}
err := con.SetReadDeadline(time.Now().Add(time.Second * time.Duration(*timeout)))
checkError(err)
r := bufio.NewReaderSize(con, 1)
match, err := regexp.MatchReader(term, r)
checkError(err)
if !match {
os.Exit(1)
}
}