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package hid
import (
"encoding/hex"
"fmt"
"time"
"github.com/bettercap/bettercap/network"
"github.com/bettercap/nrf24"
"github.com/evilsocket/islazy/str"
"github.com/evilsocket/islazy/tui"
)
func (mod *HIDRecon) isSniffing() bool {
return mod.sniffAddrRaw != nil
}
func (mod *HIDRecon) setSniffMode(mode string, silent bool) error {
if !mod.Running() {
return fmt.Errorf("please turn hid.recon on")
}
mod.sniffLock.Lock()
defer mod.sniffLock.Unlock()
mod.sniffSilent = silent
mod.inSniffMode = false
if mode == "clear" {
mod.Debug("restoring recon mode")
mod.sniffAddrRaw = nil
mod.sniffAddr = ""
mod.sniffSilent = true
} else {
if err, raw := nrf24.ConvertAddress(mode); err != nil {
return err
} else {
mod.Debug("sniffing device %s ...", tui.Bold(mode))
mod.sniffAddr = network.NormalizeHIDAddress(mode)
mod.sniffAddrRaw = raw
}
}
return nil
}
func (mod *HIDRecon) doPing() {
mod.writeLock.Lock()
defer mod.writeLock.Unlock()
if mod.inSniffMode == false {
if err := mod.dongle.EnterSnifferModeFor(mod.sniffAddrRaw); err != nil {
mod.Error("error entering sniffer mode for %s: %v", mod.sniffAddr, err)
} else {
mod.inSniffMode = true
mod.inPromMode = false
mod.Debug("device entered sniffer mode for %s", mod.sniffAddr)
}
}
if time.Since(mod.lastPing) >= mod.pingPeriod {
// try on the current channel first
if err := mod.dongle.TransmitPayload(mod.pingPayload, 250, 1); err != nil {
for mod.channel = 1; mod.channel <= nrf24.TopChannel; mod.channel++ {
if err := mod.dongle.SetChannel(mod.channel); err != nil {
mod.Error("error setting channel %d: %v", mod.channel, err)
} else if err = mod.dongle.TransmitPayload(mod.pingPayload, 250, 1); err == nil {
mod.lastPing = time.Now()
return
}
}
}
}
}
func (mod *HIDRecon) onSniffedBuffer(buf []byte) {
if sz := len(buf); sz > 0 && buf[0] == 0x00 {
buf = buf[1:]
lf := mod.Info
if mod.sniffSilent {
lf = mod.Debug
}
lf("payload for %s : %s", tui.Bold(mod.sniffAddr), str.Trim(hex.Dump(buf)))
if dev, found := mod.Session.HID.Get(mod.sniffAddr); found {
dev.LastSeen = time.Now()
dev.AddPayload(buf)
dev.AddChannel(mod.channel)
} else {
if lf = mod.Warning; mod.sniffSilent == false {
lf = mod.Debug
}
lf("got a payload for unknown device %s", mod.sniffAddr)
}
}
}
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