mirror of
https://github.com/bettercap/bettercap
synced 2025-07-10 15:23:30 -07:00
misc: refactored and ported the plugin system to islazy/plugin.Plugin (huge optimization)
This commit is contained in:
evilsocket
parent
788c8d5994
commit
dd2e8784dc
9 changed files with 374 additions and 335 deletions
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@ -1,243 +0,0 @@
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package modules
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import (
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"encoding/base64"
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"io/ioutil"
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"sync"
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"github.com/bettercap/bettercap/log"
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"github.com/bettercap/bettercap/session"
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"github.com/robertkrimen/otto"
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)
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var nullOtto = otto.Value{}
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func errOtto(format string, args ...interface{}) otto.Value {
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log.Error(format, args...)
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return nullOtto
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}
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type ProxyScript struct {
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sync.Mutex
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Path string
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Source string
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VM *otto.Otto
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sess *session.Session
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cbCacheLock *sync.Mutex
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cbCache map[string]bool
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}
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func LoadProxyScriptSource(path, source string, sess *session.Session) (err error, s *ProxyScript) {
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s = &ProxyScript{
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Path: path,
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Source: source,
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VM: otto.New(),
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sess: sess,
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cbCacheLock: &sync.Mutex{},
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cbCache: make(map[string]bool),
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}
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// this will define callbacks and global objects
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_, err = s.VM.Run(s.Source)
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if err != nil {
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return
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}
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// define session pointer
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err = s.VM.Set("env", sess.Env.Data)
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if err != nil {
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log.Error("Error while defining environment: %s", "\nTraceback:\n "+err.(*otto.Error).String())
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return
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}
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err = s.defineBuiltins()
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if err != nil {
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log.Error("Error while defining builtin functions: %s", "\nTraceback:\n "+err.(*otto.Error).String())
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return
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}
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// run onLoad if defined
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if s.hasCallback("onLoad") {
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_, err = s.VM.Run("onLoad()")
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if err != nil {
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log.Error("Error while executing onLoad callback: %s", "\nTraceback:\n "+err.(*otto.Error).String())
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return
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}
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}
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return
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}
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func LoadProxyScript(path string, sess *session.Session) (err error, s *ProxyScript) {
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raw, err := ioutil.ReadFile(path)
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if err != nil {
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return
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}
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return LoadProxyScriptSource(path, string(raw), sess)
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}
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func (s *ProxyScript) defineBuiltins() error {
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// used to read a file ... doh
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s.VM.Set("readFile", func(call otto.FunctionCall) otto.Value {
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argv := call.ArgumentList
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argc := len(argv)
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if argc != 1 {
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return errOtto("readFile: expected 1 argument, %d given instead.", argc)
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}
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filename := argv[0].String()
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raw, err := ioutil.ReadFile(filename)
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if err != nil {
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return errOtto("Could not read %s: %s", filename, err)
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}
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v, err := s.VM.ToValue(string(raw))
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if err != nil {
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return errOtto("Could not convert to string: %s", err)
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}
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return v
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})
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s.VM.Set("writeFile", func(call otto.FunctionCall) otto.Value {
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argv := call.ArgumentList
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argc := len(argv)
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if argc != 2 {
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return errOtto("writeFile: expected 2 arguments, %d given instead.", argc)
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}
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filename := argv[0].String()
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data := argv[1].String()
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err := ioutil.WriteFile(filename, []byte(data), 0644)
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if err != nil {
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return errOtto("Could not write %d bytes to %s: %s", len(data), filename, err)
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}
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return otto.NullValue()
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})
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// log something
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s.VM.Set("log", func(call otto.FunctionCall) otto.Value {
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for _, v := range call.ArgumentList {
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log.Info("%s", v.String())
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}
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return otto.Value{}
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})
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// log debug
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s.VM.Set("log_debug", func(call otto.FunctionCall) otto.Value {
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for _, v := range call.ArgumentList {
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log.Debug("%s", v.String())
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}
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return otto.Value{}
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})
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// log info
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s.VM.Set("log_info", func(call otto.FunctionCall) otto.Value {
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for _, v := range call.ArgumentList {
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log.Info("%s", v.String())
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}
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return otto.Value{}
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})
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// log warning
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s.VM.Set("log_warn", func(call otto.FunctionCall) otto.Value {
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for _, v := range call.ArgumentList {
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log.Warning("%s", v.String())
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}
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return otto.Value{}
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})
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// log error
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s.VM.Set("log_error", func(call otto.FunctionCall) otto.Value {
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for _, v := range call.ArgumentList {
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log.Error("%s", v.String())
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}
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return otto.Value{}
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})
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// log fatal
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s.VM.Set("log_fatal", func(call otto.FunctionCall) otto.Value {
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for _, v := range call.ArgumentList {
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log.Fatal("%s", v.String())
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}
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return otto.Value{}
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})
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// javascript btoa function
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s.VM.Set("btoa", func(call otto.FunctionCall) otto.Value {
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varValue := base64.StdEncoding.EncodeToString([]byte(call.Argument(0).String()))
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v, err := s.VM.ToValue(varValue)
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if err != nil {
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return errOtto("Could not convert to string: %s", varValue)
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}
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return v
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})
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// javascript atob function
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s.VM.Set("atob", func(call otto.FunctionCall) otto.Value {
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varValue, err := base64.StdEncoding.DecodeString(call.Argument(0).String())
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if err != nil {
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return errOtto("Could not decode string: %s", call.Argument(0).String())
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}
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v, err := s.VM.ToValue(string(varValue))
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if err != nil {
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return errOtto("Could not convert to string: %s", varValue)
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}
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return v
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})
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// read or write environment variable
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s.VM.Set("env", func(call otto.FunctionCall) otto.Value {
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argv := call.ArgumentList
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argc := len(argv)
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if argc == 1 {
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// get
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varName := call.Argument(0).String()
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if found, varValue := s.sess.Env.Get(varName); found {
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v, err := s.VM.ToValue(varValue)
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if err != nil {
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return errOtto("Could not convert to string: %s", varValue)
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}
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return v
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}
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} else if argc == 2 {
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// set
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varName := call.Argument(0).String()
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varValue := call.Argument(1).String()
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s.sess.Env.Set(varName, varValue)
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} else {
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return errOtto("env: expected 1 or 2 arguments, %d given instead.", argc)
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}
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return nullOtto
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})
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return nil
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}
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func (s *ProxyScript) hasCallback(name string) bool {
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s.cbCacheLock.Lock()
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defer s.cbCacheLock.Unlock()
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// check the cache
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has, found := s.cbCache[name]
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if !found {
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// check the VM
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cb, err := s.VM.Get(name)
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if err == nil && cb.IsFunction() {
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has = true
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} else {
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has = false
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}
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s.cbCache[name] = has
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}
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return has
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}
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