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patch.go
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patch.go
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package gomonkey
import (
"fmt"
"reflect"
"syscall"
"unsafe"
"github.com/agiledragon/gomonkey/v2/creflect"
)
type Patches struct {
originals map[uintptr][]byte
targets map[uintptr]uintptr
values map[reflect.Value]reflect.Value
valueHolders map[reflect.Value]reflect.Value
}
type Params []interface{}
type OutputCell struct {
Values Params
Times int
}
func ApplyFunc(target, double interface{}) *Patches {
return create().ApplyFunc(target, double)
}
func ApplyMethod(target interface{}, methodName string, double interface{}) *Patches {
return create().ApplyMethod(target, methodName, double)
}
func ApplyMethodFunc(target interface{}, methodName string, doubleFunc interface{}) *Patches {
return create().ApplyMethodFunc(target, methodName, doubleFunc)
}
func ApplyPrivateMethod(target interface{}, methodName string, double interface{}) *Patches {
return create().ApplyPrivateMethod(target, methodName, double)
}
func ApplyGlobalVar(target, double interface{}) *Patches {
return create().ApplyGlobalVar(target, double)
}
func ApplyFuncVar(target, double interface{}) *Patches {
return create().ApplyFuncVar(target, double)
}
func ApplyFuncSeq(target interface{}, outputs []OutputCell) *Patches {
return create().ApplyFuncSeq(target, outputs)
}
func ApplyMethodSeq(target interface{}, methodName string, outputs []OutputCell) *Patches {
return create().ApplyMethodSeq(target, methodName, outputs)
}
func ApplyFuncVarSeq(target interface{}, outputs []OutputCell) *Patches {
return create().ApplyFuncVarSeq(target, outputs)
}
func ApplyFuncReturn(target interface{}, output ...interface{}) *Patches {
return create().ApplyFuncReturn(target, output...)
}
func ApplyMethodReturn(target interface{}, methodName string, output ...interface{}) *Patches {
return create().ApplyMethodReturn(target, methodName, output...)
}
func ApplyFuncVarReturn(target interface{}, output ...interface{}) *Patches {
return create().ApplyFuncVarReturn(target, output...)
}
func create() *Patches {
return &Patches{originals: make(map[uintptr][]byte), targets: map[uintptr]uintptr{},
values: make(map[reflect.Value]reflect.Value), valueHolders: make(map[reflect.Value]reflect.Value)}
}
func NewPatches() *Patches {
return create()
}
func (this *Patches) Origin(fn func()) {
for target, bytes := range this.originals {
modifyBinary(target, bytes)
}
fn()
for target, targetPtr := range this.targets {
code := buildJmpDirective(targetPtr)
modifyBinary(target, code)
}
}
func (this *Patches) ApplyFunc(target, double interface{}) *Patches {
t := reflect.ValueOf(target)
d := reflect.ValueOf(double)
return this.ApplyCore(t, d)
}
func (this *Patches) ApplyMethod(target interface{}, methodName string, double interface{}) *Patches {
m, ok := castRType(target).MethodByName(methodName)
if !ok {
panic("retrieve method by name failed")
}
d := reflect.ValueOf(double)
return this.ApplyCore(m.Func, d)
}
func (this *Patches) ApplyMethodFunc(target interface{}, methodName string, doubleFunc interface{}) *Patches {
m, ok := castRType(target).MethodByName(methodName)
if !ok {
panic("retrieve method by name failed")
}
d := funcToMethod(m.Type, doubleFunc)
return this.ApplyCore(m.Func, d)
}
func (this *Patches) ApplyPrivateMethod(target interface{}, methodName string, double interface{}) *Patches {
m, ok := creflect.MethodByName(castRType(target), methodName)
if !ok {
panic("retrieve method by name failed")
}
d := reflect.ValueOf(double)
return this.ApplyCoreOnlyForPrivateMethod(m, d)
}
func (this *Patches) ApplyGlobalVar(target, double interface{}) *Patches {
t := reflect.ValueOf(target)
if t.Type().Kind() != reflect.Ptr {
panic("target is not a pointer")
}
this.values[t] = reflect.ValueOf(t.Elem().Interface())
d := reflect.ValueOf(double)
t.Elem().Set(d)
return this
}
func (this *Patches) ApplyFuncVar(target, double interface{}) *Patches {
t := reflect.ValueOf(target)
d := reflect.ValueOf(double)
if t.Type().Kind() != reflect.Ptr {
panic("target is not a pointer")
}
this.check(t.Elem(), d)
return this.ApplyGlobalVar(target, double)
}
func (this *Patches) ApplyFuncSeq(target interface{}, outputs []OutputCell) *Patches {
funcType := reflect.TypeOf(target)
t := reflect.ValueOf(target)
d := getDoubleFunc(funcType, outputs)
return this.ApplyCore(t, d)
}
func (this *Patches) ApplyMethodSeq(target interface{}, methodName string, outputs []OutputCell) *Patches {
m, ok := castRType(target).MethodByName(methodName)
if !ok {
panic("retrieve method by name failed")
}
d := getDoubleFunc(m.Type, outputs)
return this.ApplyCore(m.Func, d)
}
func (this *Patches) ApplyFuncVarSeq(target interface{}, outputs []OutputCell) *Patches {
t := reflect.ValueOf(target)
if t.Type().Kind() != reflect.Ptr {
panic("target is not a pointer")
}
if t.Elem().Kind() != reflect.Func {
panic("target is not a func")
}
funcType := reflect.TypeOf(target).Elem()
double := getDoubleFunc(funcType, outputs).Interface()
return this.ApplyGlobalVar(target, double)
}
func (this *Patches) ApplyFuncReturn(target interface{}, returns ...interface{}) *Patches {
funcType := reflect.TypeOf(target)
t := reflect.ValueOf(target)
outputs := []OutputCell{{Values: returns, Times: -1}}
d := getDoubleFunc(funcType, outputs)
return this.ApplyCore(t, d)
}
func (this *Patches) ApplyMethodReturn(target interface{}, methodName string, returns ...interface{}) *Patches {
m, ok := reflect.TypeOf(target).MethodByName(methodName)
if !ok {
panic("retrieve method by name failed")
}
outputs := []OutputCell{{Values: returns, Times: -1}}
d := getDoubleFunc(m.Type, outputs)
return this.ApplyCore(m.Func, d)
}
func (this *Patches) ApplyFuncVarReturn(target interface{}, returns ...interface{}) *Patches {
t := reflect.ValueOf(target)
if t.Type().Kind() != reflect.Ptr {
panic("target is not a pointer")
}
if t.Elem().Kind() != reflect.Func {
panic("target is not a func")
}
funcType := reflect.TypeOf(target).Elem()
outputs := []OutputCell{{Values: returns, Times: -1}}
double := getDoubleFunc(funcType, outputs).Interface()
return this.ApplyGlobalVar(target, double)
}
func (this *Patches) Reset() {
for target, bytes := range this.originals {
modifyBinary(target, bytes)
delete(this.originals, target)
}
for target, variable := range this.values {
target.Elem().Set(variable)
}
}
func (this *Patches) ApplyCore(target, double reflect.Value) *Patches {
this.check(target, double)
assTarget := *(*uintptr)(getPointer(target))
original := replace(assTarget, uintptr(getPointer(double)))
if _, ok := this.originals[assTarget]; !ok {
this.originals[assTarget] = original
}
this.targets[assTarget] = uintptr(getPointer(double))
this.valueHolders[double] = double
return this
}
func (this *Patches) ApplyCoreOnlyForPrivateMethod(target unsafe.Pointer, double reflect.Value) *Patches {
if double.Kind() != reflect.Func {
panic("double is not a func")
}
assTarget := *(*uintptr)(target)
original := replace(assTarget, uintptr(getPointer(double)))
if _, ok := this.originals[assTarget]; !ok {
this.originals[assTarget] = original
}
this.targets[assTarget] = uintptr(getPointer(double))
this.valueHolders[double] = double
return this
}
func (this *Patches) check(target, double reflect.Value) {
if target.Kind() != reflect.Func {
panic("target is not a func")
}
if double.Kind() != reflect.Func {
panic("double is not a func")
}
targetType := target.Type()
doubleType := double.Type()
if targetType.NumIn() < doubleType.NumIn() ||
targetType.NumOut() != doubleType.NumOut() ||
(targetType.NumIn() == doubleType.NumIn() && targetType.IsVariadic() != doubleType.IsVariadic()) {
panic(fmt.Sprintf("target type(%s) and double type(%s) are different", target.Type(), double.Type()))
}
for i, size := 0, doubleType.NumIn(); i < size; i {
targetIn := targetType.In(i)
doubleIn := doubleType.In(i)
if targetIn.AssignableTo(doubleIn) {
continue
}
panic(fmt.Sprintf("target type(%s) and double type(%s) are different", target.Type(), double.Type()))
}
for i, size := 0, doubleType.NumOut(); i < size; i {
targetOut := targetType.Out(i)
doubleOut := doubleType.Out(i)
if targetOut.AssignableTo(doubleOut) {
continue
}
panic(fmt.Sprintf("target type(%s) and double type(%s) are different", target.Type(), double.Type()))
}
}
func replace(target, double uintptr) []byte {
code := buildJmpDirective(double)
bytes := entryAddress(target, len(code))
original := make([]byte, len(bytes))
copy(original, bytes)
modifyBinary(target, code)
return original
}
func getDoubleFunc(funcType reflect.Type, outputs []OutputCell) reflect.Value {
if funcType.NumOut() != len(outputs[0].Values) {
panic(fmt.Sprintf("func type has %v return values, but only %v values provided as double",
funcType.NumOut(), len(outputs[0].Values)))
}
needReturn := false
slice := make([]Params, 0)
for _, output := range outputs {
if output.Times == -1 {
needReturn = true
slice = []Params{output.Values}
break
}
t := 0
if output.Times <= 1 {
t = 1
} else {
t = output.Times
}
for j := 0; j < t; j {
slice = append(slice, output.Values)
}
}
i := 0
lenOutputs := len(slice)
return reflect.MakeFunc(funcType, func(_ []reflect.Value) []reflect.Value {
if needReturn {
return GetResultValues(funcType, slice[0]...)
}
if i < lenOutputs {
i
return GetResultValues(funcType, slice[i-1]...)
}
panic("double seq is less than call seq")
})
}
func GetResultValues(funcType reflect.Type, results ...interface{}) []reflect.Value {
var resultValues []reflect.Value
for i, r := range results {
var resultValue reflect.Value
if r == nil {
resultValue = reflect.Zero(funcType.Out(i))
} else {
v := reflect.New(funcType.Out(i))
v.Elem().Set(reflect.ValueOf(r))
resultValue = v.Elem()
}
resultValues = append(resultValues, resultValue)
}
return resultValues
}
type funcValue struct {
_ uintptr
p unsafe.Pointer
}
func getPointer(v reflect.Value) unsafe.Pointer {
return (*funcValue)(unsafe.Pointer(&v)).p
}
func entryAddress(p uintptr, l int) []byte {
return *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader{Data: p, Len: l, Cap: l}))
}
func pageStart(ptr uintptr) uintptr {
return ptr & ^(uintptr(syscall.Getpagesize() - 1))
}
func funcToMethod(funcType reflect.Type, doubleFunc interface{}) reflect.Value {
rf := reflect.TypeOf(doubleFunc)
if rf.Kind() != reflect.Func {
panic("doubleFunc is not a func")
}
vf := reflect.ValueOf(doubleFunc)
return reflect.MakeFunc(funcType, func(in []reflect.Value) []reflect.Value {
if funcType.IsVariadic() {
return vf.CallSlice(in[1:])
} else {
return vf.Call(in[1:])
}
})
}
func castRType(val interface{}) reflect.Type {
if rTypeVal, ok := val.(reflect.Type); ok {
return rTypeVal
}
return reflect.TypeOf(val)
}