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duckyparser.go
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duckyparser.go
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package hid
import (
"fmt"
"strconv"
"strings"
"github.com/evilsocket/islazy/fs"
)
type DuckyParser struct {
mod *HIDRecon
}
func (p DuckyParser) parseLiteral(what string, kmap KeyMap) (*Command, error) {
// get reference command from the layout
ref, found := kmap[what]
if found == false {
return nil, fmt.Errorf("can't find '%s' in current keymap", what)
}
return &Command{
HID: ref.HID,
Mode: ref.Mode,
}, nil
}
func (p DuckyParser) parseModifier(line string, kmap KeyMap, modMask byte) (*Command, error) {
// get optional key after the modifier
ch := ""
if idx := strings.IndexRune(line, ' '); idx != -1 {
ch = line[idx+1:]
}
cmd, err := p.parseLiteral(ch, kmap)
if err != nil {
return nil, err
}
// apply modifier mask
cmd.Mode |= modMask
return cmd, nil
}
func (p DuckyParser) parseNumber(from string) (int, error) {
idx := strings.IndexRune(from, ' ')
if idx == -1 {
return 0, fmt.Errorf("can't parse number from '%s'", from)
}
num, err := strconv.Atoi(from[idx+1:])
if err != nil {
return 0, fmt.Errorf("can't parse number from '%s': %v", from, err)
}
return num, nil
}
func (p DuckyParser) parseString(from string) (string, error) {
idx := strings.IndexRune(from, ' ')
if idx == -1 {
return "", fmt.Errorf("can't parse string from '%s'", from)
}
return from[idx+1:], nil
}
func (p DuckyParser) lineIs(line string, tokens ...string) bool {
for _, tok := range tokens {
if strings.HasPrefix(line, tok) {
return true
}
}
return false
}
func (p DuckyParser) Parse(kmap KeyMap, path string) (cmds []*Command, err error) {
lines := []string{}
source := []string{}
reader := (chan string)(nil)
if reader, err = fs.LineReader(path); err != nil {
return
} else {
for line := range reader {
lines = append(lines, line)
}
}
// preprocessing
for lineno, line := range lines {
if p.lineIs(line, "REPEAT") {
if lineno == 0 {
err = fmt.Errorf("error on line %d: REPEAT instruction at the beginning of the script", lineno+1)
return
}
times := 1
times, err = p.parseNumber(line)
if err != nil {
return
}
for i := 0; i < times; i++ {
source = append(source, lines[lineno-1])
}
} else {
source = append(source, line)
}
}
cmds = make([]*Command, 0)
for _, line := range source {
cmd := &Command{}
if p.lineIs(line, "CTRL", "CONTROL") {
if cmd, err = p.parseModifier(line, kmap, 1); err != nil {
return
}
} else if p.lineIs(line, "SHIFT") {
if cmd, err = p.parseModifier(line, kmap, 2); err != nil {
return
}
} else if p.lineIs(line, "ALT") {
if cmd, err = p.parseModifier(line, kmap, 4); err != nil {
return
}
} else if p.lineIs(line, "GUI", "WINDOWS", "COMMAND") {
if cmd, err = p.parseModifier(line, kmap, 8); err != nil {
return
}
} else if p.lineIs(line, "CTRL-ALT", "CONTROL-ALT") {
if cmd, err = p.parseModifier(line, kmap, 4|1); err != nil {
return
}
} else if p.lineIs(line, "CTRL-SHIFT", "CONTROL-SHIFT") {
if cmd, err = p.parseModifier(line, kmap, 1|2); err != nil {
return
}
} else if p.lineIs(line, "ESC", "ESCAPE", "APP") {
if cmd, err = p.parseLiteral("ESCAPE", kmap); err != nil {
return
}
} else if p.lineIs(line, "ENTER") {
if cmd, err = p.parseLiteral("ENTER", kmap); err != nil {
return
}
} else if p.lineIs(line, "UP", "UPARROW") {
if cmd, err = p.parseLiteral("UP", kmap); err != nil {
return
}
} else if p.lineIs(line, "DOWN", "DOWNARROW") {
if cmd, err = p.parseLiteral("DOWN", kmap); err != nil {
return
}
} else if p.lineIs(line, "LEFT", "LEFTARROW") {
if cmd, err = p.parseLiteral("LEFT", kmap); err != nil {
return
}
} else if p.lineIs(line, "RIGHT", "RIGHTARROW") {
if cmd, err = p.parseLiteral("RIGHT", kmap); err != nil {
return
}
} else if p.lineIs(line, "DELAY", "SLEEP") {
secs := 0
if secs, err = p.parseNumber(line); err != nil {
return
}
cmd = &Command{Sleep: secs}
} else if p.lineIs(line, "STRING", "STR") {
str := ""
if str, err = p.parseString(line); err != nil {
return
}
for _, c := range str {
if cmd, err = p.parseLiteral(string(c), kmap); err != nil {
return
}
cmds = append(cmds, cmd)
}
continue
} else if cmd, err = p.parseLiteral(line, kmap); err != nil {
err = fmt.Errorf("error parsing '%s': %s", line, err)
return
}
cmds = append(cmds, cmd)
}
return
}