// Copyright 2019 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package fourbyte
import (
"math/big"
"reflect"
"strings"
"testing"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
)
func verify(t *testing.T, jsondata, calldata string, exp []interface{}) {
abispec, err := abi.JSON(strings.NewReader(jsondata))
if err != nil {
t.Fatal(err)
}
cd := common.Hex2Bytes(calldata)
sigdata, argdata := cd[:4], cd[4:]
method, err := abispec.MethodById(sigdata)
if err != nil {
t.Fatal(err)
}
data, err := method.Inputs.UnpackValues(argdata)
if err != nil {
t.Fatal(err)
}
if len(data) != len(exp) {
t.Fatalf("Mismatched length, expected %d, got %d", len(exp), len(data))
}
for i, elem := range data {
if !reflect.DeepEqual(elem, exp[i]) {
t.Fatalf("Unpack error, arg %d, got %v, want %v", i, elem, exp[i])
}
}
}
func TestNewUnpacker(t *testing.T) {
type unpackTest struct {
jsondata string
calldata string
exp []interface{}
}
testcases := []unpackTest{
{ // https://solidity.readthedocs.io/en/develop/abi-spec.html#use-of-dynamic-types
`[{"type":"function","name":"f", "inputs":[{"type":"uint256"},{"type":"uint32[]"},{"type":"bytes10"},{"type":"bytes"}]}]`,
// 0x123, [0x456, 0x789], "1234567890", "Hello, world!"
"8be65246" + "00000000000000000000000000000000000000000000000000000000000001230000000000000000000000000000000000000000000000000000000000000080313233343536373839300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000004560000000000000000000000000000000000000000000000000000000000000789000000000000000000000000000000000000000000000000000000000000000d48656c6c6f2c20776f726c642100000000000000000000000000000000000000",
[]interface{}{
big.NewInt(0x123),
[]uint32{0x456, 0x789},
[10]byte{49, 50, 51, 52, 53, 54, 55, 56, 57, 48},
common.Hex2Bytes("48656c6c6f2c20776f726c6421"),
},
}, { // https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI#examples
`[{"type":"function","name":"sam","inputs":[{"type":"bytes"},{"type":"bool"},{"type":"uint256[]"}]}]`,
// "dave", true and [1,2,3]
"a5643bf20000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000464617665000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003",
[]interface{}{
[]byte{0x64, 0x61, 0x76, 0x65},
true,
[]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)},
},
}, {
`[{"type":"function","name":"send","inputs":[{"type":"uint256"}]}]`,
"a52c101e0000000000000000000000000000000000000000000000000000000000000012",
[]interface{}{big.NewInt(0x12)},
}, {
`[{"type":"function","name":"compareAndApprove","inputs":[{"type":"address"},{"type":"uint256"},{"type":"uint256"}]}]`,
"751e107900000000000000000000000000000133700000deadbeef00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001",
[]interface{}{
common.HexToAddress("0x00000133700000deadbeef000000000000000000"),
new(big.Int).SetBytes([]byte{0x00}),
big.NewInt(0x1),
},
},
}
for _, c := range testcases {
verify(t, c.jsondata, c.calldata, c.exp)
}
}
func TestCalldataDecoding(t *testing.T) {
// send(uint256) : a52c101e
// compareAndApprove(address,uint256,uint256) : 751e1079
// issue(address[],uint256) : 42958b54
jsondata := `
[
{"type":"function","name":"send","inputs":[{"name":"a","type":"uint256"}]},
{"type":"function","name":"compareAndApprove","inputs":[{"name":"a","type":"address"},{"name":"a","type":"uint256"},{"name":"a","type":"uint256"}]},
{"type":"function","name":"issue","inputs":[{"name":"a","type":"address[]"},{"name":"a","type":"uint256"}]},
{"type":"function","name":"sam","inputs":[{"name":"a","type":"bytes"},{"name":"a","type":"bool"},{"name":"a","type":"uint256[]"}]}
]`
// Expected failures
for i, hexdata := range []string{
"a52c101e00000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000042",
"a52c101e000000000000000000000000000000000000000000000000000000000000001200",
"a52c101e00000000000000000000000000000000000000000000000000000000000000",
"a52c101e",
"a52c10",
"",
// Too short
"751e10790000000000000000000000000000000000000000000000000000000000000012",
"751e1079FFffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
// Not valid multiple of 32
"deadbeef00000000000000000000000000000000000000000000000000000000000000",
// Too short 'issue'
"42958b5400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000042",
// Too short compareAndApprove
"a52c101e00ff0000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000042",
// From https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI
// contains a bool with illegal values
"a5643bf20000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000001100000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000464617665000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003",
} {
_, err := parseCallData(common.Hex2Bytes(hexdata), jsondata)
if err == nil {
t.Errorf("test %d: expected decoding to fail: %s", i, hexdata)
}
}
// Expected success
for i, hexdata := range []string{
// From https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI
"a5643bf20000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000464617665000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003",
"a52c101e0000000000000000000000000000000000000000000000000000000000000012",
"a52c101eFFffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
"751e1079000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
"42958b54" +
// start of dynamic type
"0000000000000000000000000000000000000000000000000000000000000040" +
// uint256
"0000000000000000000000000000000000000000000000000000000000000001" +
// length of array
"0000000000000000000000000000000000000000000000000000000000000002" +
// array values
"000000000000000000000000000000000000000000000000000000000000dead" +
"000000000000000000000000000000000000000000000000000000000000beef",
} {
_, err := parseCallData(common.Hex2Bytes(hexdata), jsondata)
if err != nil {
t.Errorf("test %d: unexpected failure on input %s:\n %v (%d bytes) ", i, hexdata, err, len(common.Hex2Bytes(hexdata)))
}
}
}
func TestMaliciousABIStrings(t *testing.T) {
tests := []string{
"func(uint256,uint256,[]uint256)",
"func(uint256,uint256,uint256,)",
"func(,uint256,uint256,uint256)",
}
data := common.Hex2Bytes("4401a6e40000000000000000000000000000000000000000000000000000000000000012")
for i, tt := range tests {
_, err := verifySelector(tt, data)
if err == nil {
t.Errorf("test %d: expected error for selector '%v'", i, tt)
}
}
}
