// Copyright 2017 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 . package abi import ( "bytes" "encoding/hex" "fmt" "math/big" "reflect" "strconv" "strings" "testing" "github.com/ethereum/go-ethereum/common" "github.com/stretchr/testify/require" ) type unpackTest struct { def string // ABI definition JSON enc string // evm return data want interface{} // the expected output err string // empty or error if expected } func (test unpackTest) checkError(err error) error { if err != nil { if len(test.err) == 0 { return fmt.Errorf("expected no err but got: %v", err) } else if err.Error() != test.err { return fmt.Errorf("expected err: '%v' got err: %q", test.err, err) } } else if len(test.err) > 0 { return fmt.Errorf("expected err: %v but got none", test.err) } return nil } var unpackTests = []unpackTest{ { def: `[{ "type": "bool" }]`, enc: "0000000000000000000000000000000000000000000000000000000000000001", want: true, }, { def: `[{ "type": "bool" }]`, enc: "0000000000000000000000000000000000000000000000000000000000000000", want: false, }, { def: `[{ "type": "bool" }]`, enc: "0000000000000000000000000000000000000000000000000001000000000001", want: false, err: "abi: improperly encoded boolean value", }, { def: `[{ "type": "bool" }]`, enc: "0000000000000000000000000000000000000000000000000000000000000003", want: false, err: "abi: improperly encoded boolean value", }, { def: `[{"type": "uint32"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000001", want: uint32(1), }, { def: `[{"type": "uint32"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000001", want: uint16(0), err: "abi: cannot unmarshal uint32 in to uint16", }, { def: `[{"type": "uint17"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000001", want: uint16(0), err: "abi: cannot unmarshal *big.Int in to uint16", }, { def: `[{"type": "uint17"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000001", want: big.NewInt(1), }, { def: `[{"type": "int32"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000001", want: int32(1), }, { def: `[{"type": "int32"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000001", want: int16(0), err: "abi: cannot unmarshal int32 in to int16", }, { def: `[{"type": "int17"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000001", want: int16(0), err: "abi: cannot unmarshal *big.Int in to int16", }, { def: `[{"type": "int17"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000001", want: big.NewInt(1), }, { def: `[{"type": "int256"}]`, enc: "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", want: big.NewInt(-1), }, { def: `[{"type": "address"}]`, enc: "0000000000000000000000000100000000000000000000000000000000000000", want: common.Address{1}, }, { def: `[{"type": "bytes32"}]`, enc: "0100000000000000000000000000000000000000000000000000000000000000", want: [32]byte{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, }, { def: `[{"type": "bytes"}]`, enc: "000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000200100000000000000000000000000000000000000000000000000000000000000", want: common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"), }, { def: `[{"type": "bytes"}]`, enc: "000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000200100000000000000000000000000000000000000000000000000000000000000", want: [32]byte{}, err: "abi: cannot unmarshal []uint8 in to [32]uint8", }, { def: `[{"type": "bytes32"}]`, enc: "000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000200100000000000000000000000000000000000000000000000000000000000000", want: []byte(nil), err: "abi: cannot unmarshal [32]uint8 in to []uint8", }, { def: `[{"type": "bytes32"}]`, enc: "0100000000000000000000000000000000000000000000000000000000000000", want: [32]byte{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, }, { def: `[{"type": "function"}]`, enc: "0100000000000000000000000000000000000000000000000000000000000000", want: [24]byte{1}, }, // slices { def: `[{"type": "uint8[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: []uint8{1, 2}, }, { def: `[{"type": "uint8[2]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: [2]uint8{1, 2}, }, // multi dimensional, if these pass, all types that don't require length prefix should pass { def: `[{"type": "uint8[][]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: [][]uint8{{1, 2}, {1, 2}}, }, { def: `[{"type": "uint8[][]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003", want: [][]uint8{{1, 2}, {1, 2, 3}}, }, { def: `[{"type": "uint8[2][2]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: [2][2]uint8{{1, 2}, {1, 2}}, }, { def: `[{"type": "uint8[][2]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001", want: [2][]uint8{{1}, {1}}, }, { def: `[{"type": "uint8[2][]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: [][2]uint8{{1, 2}}, }, { def: `[{"type": "uint8[2][]"}]`, enc: "000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: [][2]uint8{{1, 2}, {1, 2}}, }, { def: `[{"type": "uint16[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: []uint16{1, 2}, }, { def: `[{"type": "uint16[2]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: [2]uint16{1, 2}, }, { def: `[{"type": "uint32[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: []uint32{1, 2}, }, { def: `[{"type": "uint32[2]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: [2]uint32{1, 2}, }, { def: `[{"type": "uint32[2][3][4]"}]`, enc: "000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000700000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000f000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000012000000000000000000000000000000000000000000000000000000000000001300000000000000000000000000000000000000000000000000000000000000140000000000000000000000000000000000000000000000000000000000000015000000000000000000000000000000000000000000000000000000000000001600000000000000000000000000000000000000000000000000000000000000170000000000000000000000000000000000000000000000000000000000000018", want: [4][3][2]uint32{{{1, 2}, {3, 4}, {5, 6}}, {{7, 8}, {9, 10}, {11, 12}}, {{13, 14}, {15, 16}, {17, 18}}, {{19, 20}, {21, 22}, {23, 24}}}, }, { def: `[{"type": "uint64[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: []uint64{1, 2}, }, { def: `[{"type": "uint64[2]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: [2]uint64{1, 2}, }, { def: `[{"type": "uint256[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: []*big.Int{big.NewInt(1), big.NewInt(2)}, }, { def: `[{"type": "uint256[3]"}]`, enc: "000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003", want: [3]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)}, }, { def: `[{"type": "string[4]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000140000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000b476f2d657468657265756d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008457468657265756d000000000000000000000000000000000000000000000000", want: [4]string{"Hello", "World", "Go-ethereum", "Ethereum"}, }, { def: `[{"type": "string[]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000008457468657265756d000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000b676f2d657468657265756d000000000000000000000000000000000000000000", want: []string{"Ethereum", "go-ethereum"}, }, { def: `[{"type": "bytes[]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000003f0f0f000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003f0f0f00000000000000000000000000000000000000000000000000000000000", want: [][]byte{{0xf0, 0xf0, 0xf0}, {0xf0, 0xf0, 0xf0}}, }, { def: `[{"type": "uint256[2][][]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000c8000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000003e80000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000c8000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000003e8", want: [][][2]*big.Int{{{big.NewInt(1), big.NewInt(200)}, {big.NewInt(1), big.NewInt(1000)}}, {{big.NewInt(1), big.NewInt(200)}, {big.NewInt(1), big.NewInt(1000)}}}, }, { def: `[{"type": "int8[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: []int8{1, 2}, }, { def: `[{"type": "int8[2]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: [2]int8{1, 2}, }, { def: `[{"type": "int16[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: []int16{1, 2}, }, { def: `[{"type": "int16[2]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: [2]int16{1, 2}, }, { def: `[{"type": "int32[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: []int32{1, 2}, }, { def: `[{"type": "int32[2]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: [2]int32{1, 2}, }, { def: `[{"type": "int64[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: []int64{1, 2}, }, { def: `[{"type": "int64[2]"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: [2]int64{1, 2}, }, { def: `[{"type": "int256[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: []*big.Int{big.NewInt(1), big.NewInt(2)}, }, { def: `[{"type": "int256[3]"}]`, enc: "000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003", want: [3]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)}, }, // struct outputs { def: `[{"name":"int1","type":"int256"},{"name":"int2","type":"int256"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: struct { Int1 *big.Int Int2 *big.Int }{big.NewInt(1), big.NewInt(2)}, }, { def: `[{"name":"int_one","type":"int256"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: struct { IntOne *big.Int }{big.NewInt(1)}, }, { def: `[{"name":"int__one","type":"int256"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: struct { IntOne *big.Int }{big.NewInt(1)}, }, { def: `[{"name":"int_one_","type":"int256"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: struct { IntOne *big.Int }{big.NewInt(1)}, }, { def: `[{"name":"int_one","type":"int256"}, {"name":"intone","type":"int256"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: struct { IntOne *big.Int Intone *big.Int }{big.NewInt(1), big.NewInt(2)}, }, { def: `[{"name":"___","type":"int256"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: struct { IntOne *big.Int Intone *big.Int }{}, err: "abi: purely underscored output cannot unpack to struct", }, { def: `[{"name":"int_one","type":"int256"},{"name":"IntOne","type":"int256"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: struct { Int1 *big.Int Int2 *big.Int }{}, err: "abi: multiple outputs mapping to the same struct field 'IntOne'", }, { def: `[{"name":"int","type":"int256"},{"name":"Int","type":"int256"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: struct { Int1 *big.Int Int2 *big.Int }{}, err: "abi: multiple outputs mapping to the same struct field 'Int'", }, { def: `[{"name":"int","type":"int256"},{"name":"_int","type":"int256"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: struct { Int1 *big.Int Int2 *big.Int }{}, err: "abi: multiple outputs mapping to the same struct field 'Int'", }, { def: `[{"name":"Int","type":"int256"},{"name":"_int","type":"int256"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: struct { Int1 *big.Int Int2 *big.Int }{}, err: "abi: multiple outputs mapping to the same struct field 'Int'", }, { def: `[{"name":"Int","type":"int256"},{"name":"_","type":"int256"}]`, enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002", want: struct { Int1 *big.Int Int2 *big.Int }{}, err: "abi: purely underscored output cannot unpack to struct", }, } func TestUnpack(t *testing.T) { for i, test := range unpackTests { t.Run(strconv.Itoa(i), func(t *testing.T) { def := fmt.Sprintf(`[{ "name" : "method", "outputs": %s}]`, test.def) abi, err := JSON(strings.NewReader(def)) if err != nil { t.Fatalf("invalid ABI definition %s: %v", def, err) } encb, err := hex.DecodeString(test.enc) if err != nil { t.Fatalf("invalid hex: %s" + test.enc) } outptr := reflect.New(reflect.TypeOf(test.want)) err = abi.Unpack(outptr.Interface(), "method", encb) if err := test.checkError(err); err != nil { t.Errorf("test %d (%v) failed: %v", i, test.def, err) return } out := outptr.Elem().Interface() if !reflect.DeepEqual(test.want, out) { t.Errorf("test %d (%v) failed: expected %v, got %v", i, test.def, test.want, out) } }) } } func TestUnpackSetDynamicArrayOutput(t *testing.T) { abi, err := JSON(strings.NewReader(`[{"constant":true,"inputs":[],"name":"testDynamicFixedBytes15","outputs":[{"name":"","type":"bytes15[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"testDynamicFixedBytes32","outputs":[{"name":"","type":"bytes32[]"}],"payable":false,"stateMutability":"view","type":"function"}]`)) if err != nil { t.Fatal(err) } var ( marshalledReturn32 = common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000230783132333435363738393000000000000000000000000000000000000000003078303938373635343332310000000000000000000000000000000000000000") marshalledReturn15 = common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000230783031323334350000000000000000000000000000000000000000000000003078393837363534000000000000000000000000000000000000000000000000") out32 [][32]byte out15 [][15]byte ) // test 32 err = abi.Unpack(&out32, "testDynamicFixedBytes32", marshalledReturn32) if err != nil { t.Fatal(err) } if len(out32) != 2 { t.Fatalf("expected array with 2 values, got %d", len(out32)) } expected := common.Hex2Bytes("3078313233343536373839300000000000000000000000000000000000000000") if !bytes.Equal(out32[0][:], expected) { t.Errorf("expected %x, got %x\n", expected, out32[0]) } expected = common.Hex2Bytes("3078303938373635343332310000000000000000000000000000000000000000") if !bytes.Equal(out32[1][:], expected) { t.Errorf("expected %x, got %x\n", expected, out32[1]) } // test 15 err = abi.Unpack(&out15, "testDynamicFixedBytes32", marshalledReturn15) if err != nil { t.Fatal(err) } if len(out15) != 2 { t.Fatalf("expected array with 2 values, got %d", len(out15)) } expected = common.Hex2Bytes("307830313233343500000000000000") if !bytes.Equal(out15[0][:], expected) { t.Errorf("expected %x, got %x\n", expected, out15[0]) } expected = common.Hex2Bytes("307839383736353400000000000000") if !bytes.Equal(out15[1][:], expected) { t.Errorf("expected %x, got %x\n", expected, out15[1]) } } type methodMultiOutput struct { Int *big.Int String string } func methodMultiReturn(require *require.Assertions) (ABI, []byte, methodMultiOutput) { const definition = `[ { "name" : "multi", "constant" : false, "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]` var expected = methodMultiOutput{big.NewInt(1), "hello"} abi, err := JSON(strings.NewReader(definition)) require.NoError(err) // using buff to make the code readable buff := new(bytes.Buffer) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040")) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000005")) buff.Write(common.RightPadBytes([]byte(expected.String), 32)) return abi, buff.Bytes(), expected } func TestMethodMultiReturn(t *testing.T) { type reversed struct { String string Int *big.Int } abi, data, expected := methodMultiReturn(require.New(t)) bigint := new(big.Int) var testCases = []struct { dest interface{} expected interface{} error string name string }{{ &methodMultiOutput{}, &expected, "", "Can unpack into structure", }, { &reversed{}, &reversed{expected.String, expected.Int}, "", "Can unpack into reversed structure", }, { &[]interface{}{&bigint, new(string)}, &[]interface{}{&expected.Int, &expected.String}, "", "Can unpack into a slice", }, { &[2]interface{}{&bigint, new(string)}, &[2]interface{}{&expected.Int, &expected.String}, "", "Can unpack into an array", }, { &[]interface{}{new(int), new(int)}, &[]interface{}{&expected.Int, &expected.String}, "abi: cannot unmarshal *big.Int in to int", "Can not unpack into a slice with wrong types", }, { &[]interface{}{new(int)}, &[]interface{}{}, "abi: insufficient number of elements in the list/array for unpack, want 2, got 1", "Can not unpack into a slice with wrong types", }} for _, tc := range testCases { tc := tc t.Run(tc.name, func(t *testing.T) { require := require.New(t) err := abi.Unpack(tc.dest, "multi", data) if tc.error == "" { require.Nil(err, "Should be able to unpack method outputs.") require.Equal(tc.expected, tc.dest) } else { require.EqualError(err, tc.error) } }) } } func TestMultiReturnWithArray(t *testing.T) { const definition = `[{"name" : "multi", "outputs": [{"type": "uint64[3]"}, {"type": "uint64"}]}]` abi, err := JSON(strings.NewReader(definition)) if err != nil { t.Fatal(err) } buff := new(bytes.Buffer) buff.Write(common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000900000000000000000000000000000000000000000000000000000000000000090000000000000000000000000000000000000000000000000000000000000009")) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000008")) ret1, ret1Exp := new([3]uint64), [3]uint64{9, 9, 9} ret2, ret2Exp := new(uint64), uint64(8) if err := abi.Unpack(&[]interface{}{ret1, ret2}, "multi", buff.Bytes()); err != nil { t.Fatal(err) } if !reflect.DeepEqual(*ret1, ret1Exp) { t.Error("array result", *ret1, "!= Expected", ret1Exp) } if *ret2 != ret2Exp { t.Error("int result", *ret2, "!= Expected", ret2Exp) } } func TestMultiReturnWithStringArray(t *testing.T) { const definition = `[{"name" : "multi", "outputs": [{"name": "","type": "uint256[3]"},{"name": "","type": "address"},{"name": "","type": "string[2]"},{"name": "","type": "bool"}]}]` abi, err := JSON(strings.NewReader(definition)) if err != nil { t.Fatal(err) } buff := new(bytes.Buffer) buff.Write(common.Hex2Bytes("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")) temp, _ := big.NewInt(0).SetString("30000000000000000000", 10) ret1, ret1Exp := new([3]*big.Int), [3]*big.Int{big.NewInt(1545304298), big.NewInt(6), temp} ret2, ret2Exp := new(common.Address), common.HexToAddress("ab1257528b3782fb40d7ed5f72e624b744dffb2f") ret3, ret3Exp := new([2]string), [2]string{"Ethereum", "Hello, Ethereum!"} ret4, ret4Exp := new(bool), false if err := abi.Unpack(&[]interface{}{ret1, ret2, ret3, ret4}, "multi", buff.Bytes()); err != nil { t.Fatal(err) } if !reflect.DeepEqual(*ret1, ret1Exp) { t.Error("big.Int array result", *ret1, "!= Expected", ret1Exp) } if !reflect.DeepEqual(*ret2, ret2Exp) { t.Error("address result", *ret2, "!= Expected", ret2Exp) } if !reflect.DeepEqual(*ret3, ret3Exp) { t.Error("string array result", *ret3, "!= Expected", ret3Exp) } if !reflect.DeepEqual(*ret4, ret4Exp) { t.Error("bool result", *ret4, "!= Expected", ret4Exp) } } func TestMultiReturnWithStringSlice(t *testing.T) { const definition = `[{"name" : "multi", "outputs": [{"name": "","type": "string[]"},{"name": "","type": "uint256[]"}]}]` abi, err := JSON(strings.NewReader(definition)) if err != nil { t.Fatal(err) } buff := new(bytes.Buffer) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040")) // output[0] offset buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000120")) // output[1] offset buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002")) // output[0] length buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040")) // output[0][0] offset buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000080")) // output[0][1] offset buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000008")) // output[0][0] length buff.Write(common.Hex2Bytes("657468657265756d000000000000000000000000000000000000000000000000")) // output[0][0] value buff.Write(common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000b")) // output[0][1] length buff.Write(common.Hex2Bytes("676f2d657468657265756d000000000000000000000000000000000000000000")) // output[0][1] value buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002")) // output[1] length buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000064")) // output[1][0] value buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000065")) // output[1][1] value ret1, ret1Exp := new([]string), []string{"ethereum", "go-ethereum"} ret2, ret2Exp := new([]*big.Int), []*big.Int{big.NewInt(100), big.NewInt(101)} if err := abi.Unpack(&[]interface{}{ret1, ret2}, "multi", buff.Bytes()); err != nil { t.Fatal(err) } if !reflect.DeepEqual(*ret1, ret1Exp) { t.Error("string slice result", *ret1, "!= Expected", ret1Exp) } if !reflect.DeepEqual(*ret2, ret2Exp) { t.Error("uint256 slice result", *ret2, "!= Expected", ret2Exp) } } func TestMultiReturnWithDeeplyNestedArray(t *testing.T) { // Similar to TestMultiReturnWithArray, but with a special case in mind: // values of nested static arrays count towards the size as well, and any element following // after such nested array argument should be read with the correct offset, // so that it does not read content from the previous array argument. const definition = `[{"name" : "multi", "outputs": [{"type": "uint64[3][2][4]"}, {"type": "uint64"}]}]` abi, err := JSON(strings.NewReader(definition)) if err != nil { t.Fatal(err) } buff := new(bytes.Buffer) // construct the test array, each 3 char element is joined with 61 '0' chars, // to from the ((3 + 61) * 0.5) = 32 byte elements in the array. buff.Write(common.Hex2Bytes(strings.Join([]string{ "", //empty, to apply the 61-char separator to the first element as well. "111", "112", "113", "121", "122", "123", "211", "212", "213", "221", "222", "223", "311", "312", "313", "321", "322", "323", "411", "412", "413", "421", "422", "423", }, "0000000000000000000000000000000000000000000000000000000000000"))) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000009876")) ret1, ret1Exp := new([4][2][3]uint64), [4][2][3]uint64{ {{0x111, 0x112, 0x113}, {0x121, 0x122, 0x123}}, {{0x211, 0x212, 0x213}, {0x221, 0x222, 0x223}}, {{0x311, 0x312, 0x313}, {0x321, 0x322, 0x323}}, {{0x411, 0x412, 0x413}, {0x421, 0x422, 0x423}}, } ret2, ret2Exp := new(uint64), uint64(0x9876) if err := abi.Unpack(&[]interface{}{ret1, ret2}, "multi", buff.Bytes()); err != nil { t.Fatal(err) } if !reflect.DeepEqual(*ret1, ret1Exp) { t.Error("array result", *ret1, "!= Expected", ret1Exp) } if *ret2 != ret2Exp { t.Error("int result", *ret2, "!= Expected", ret2Exp) } } func TestUnmarshal(t *testing.T) { const definition = `[ { "name" : "int", "constant" : false, "outputs": [ { "type": "uint256" } ] }, { "name" : "bool", "constant" : false, "outputs": [ { "type": "bool" } ] }, { "name" : "bytes", "constant" : false, "outputs": [ { "type": "bytes" } ] }, { "name" : "fixed", "constant" : false, "outputs": [ { "type": "bytes32" } ] }, { "name" : "multi", "constant" : false, "outputs": [ { "type": "bytes" }, { "type": "bytes" } ] }, { "name" : "intArraySingle", "constant" : false, "outputs": [ { "type": "uint256[3]" } ] }, { "name" : "addressSliceSingle", "constant" : false, "outputs": [ { "type": "address[]" } ] }, { "name" : "addressSliceDouble", "constant" : false, "outputs": [ { "name": "a", "type": "address[]" }, { "name": "b", "type": "address[]" } ] }, { "name" : "mixedBytes", "constant" : true, "outputs": [ { "name": "a", "type": "bytes" }, { "name": "b", "type": "bytes32" } ] }]` abi, err := JSON(strings.NewReader(definition)) if err != nil { t.Fatal(err) } buff := new(bytes.Buffer) // marshall mixed bytes (mixedBytes) p0, p0Exp := []byte{}, common.Hex2Bytes("01020000000000000000") p1, p1Exp := [32]byte{}, common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000ddeeff") mixedBytes := []interface{}{&p0, &p1} buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040")) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000ddeeff")) buff.Write(common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000a")) buff.Write(common.Hex2Bytes("0102000000000000000000000000000000000000000000000000000000000000")) err = abi.Unpack(&mixedBytes, "mixedBytes", buff.Bytes()) if err != nil { t.Error(err) } else { if !bytes.Equal(p0, p0Exp) { t.Errorf("unexpected value unpacked: want %x, got %x", p0Exp, p0) } if !bytes.Equal(p1[:], p1Exp) { t.Errorf("unexpected value unpacked: want %x, got %x", p1Exp, p1) } } // marshal int var Int *big.Int err = abi.Unpack(&Int, "int", common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) if err != nil { t.Error(err) } if Int == nil || Int.Cmp(big.NewInt(1)) != 0 { t.Error("expected Int to be 1 got", Int) } // marshal bool var Bool bool err = abi.Unpack(&Bool, "bool", common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) if err != nil { t.Error(err) } if !Bool { t.Error("expected Bool to be true") } // marshal dynamic bytes max length 32 buff.Reset() buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020")) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020")) bytesOut := common.RightPadBytes([]byte("hello"), 32) buff.Write(bytesOut) var Bytes []byte err = abi.Unpack(&Bytes, "bytes", buff.Bytes()) if err != nil { t.Error(err) } if !bytes.Equal(Bytes, bytesOut) { t.Errorf("expected %x got %x", bytesOut, Bytes) } // marshall dynamic bytes max length 64 buff.Reset() buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020")) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040")) bytesOut = common.RightPadBytes([]byte("hello"), 64) buff.Write(bytesOut) err = abi.Unpack(&Bytes, "bytes", buff.Bytes()) if err != nil { t.Error(err) } if !bytes.Equal(Bytes, bytesOut) { t.Errorf("expected %x got %x", bytesOut, Bytes) } // marshall dynamic bytes max length 64 buff.Reset() buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020")) buff.Write(common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000003f")) bytesOut = common.RightPadBytes([]byte("hello"), 64) buff.Write(bytesOut) err = abi.Unpack(&Bytes, "bytes", buff.Bytes()) if err != nil { t.Error(err) } if !bytes.Equal(Bytes, bytesOut[:len(bytesOut)-1]) { t.Errorf("expected %x got %x", bytesOut[:len(bytesOut)-1], Bytes) } // marshal dynamic bytes output empty err = abi.Unpack(&Bytes, "bytes", nil) if err == nil { t.Error("expected error") } // marshal dynamic bytes length 5 buff.Reset() buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020")) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000005")) buff.Write(common.RightPadBytes([]byte("hello"), 32)) err = abi.Unpack(&Bytes, "bytes", buff.Bytes()) if err != nil { t.Error(err) } if !bytes.Equal(Bytes, []byte("hello")) { t.Errorf("expected %x got %x", bytesOut, Bytes) } // marshal dynamic bytes length 5 buff.Reset() buff.Write(common.RightPadBytes([]byte("hello"), 32)) var hash common.Hash err = abi.Unpack(&hash, "fixed", buff.Bytes()) if err != nil { t.Error(err) } helloHash := common.BytesToHash(common.RightPadBytes([]byte("hello"), 32)) if hash != helloHash { t.Errorf("Expected %x to equal %x", hash, helloHash) } // marshal error buff.Reset() buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020")) err = abi.Unpack(&Bytes, "bytes", buff.Bytes()) if err == nil { t.Error("expected error") } err = abi.Unpack(&Bytes, "multi", make([]byte, 64)) if err == nil { t.Error("expected error") } buff.Reset() buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002")) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000003")) // marshal int array var intArray [3]*big.Int err = abi.Unpack(&intArray, "intArraySingle", buff.Bytes()) if err != nil { t.Error(err) } var testAgainstIntArray [3]*big.Int testAgainstIntArray[0] = big.NewInt(1) testAgainstIntArray[1] = big.NewInt(2) testAgainstIntArray[2] = big.NewInt(3) for i, Int := range intArray { if Int.Cmp(testAgainstIntArray[i]) != 0 { t.Errorf("expected %v, got %v", testAgainstIntArray[i], Int) } } // marshal address slice buff.Reset() buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020")) // offset buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // size buff.Write(common.Hex2Bytes("0000000000000000000000000100000000000000000000000000000000000000")) var outAddr []common.Address err = abi.Unpack(&outAddr, "addressSliceSingle", buff.Bytes()) if err != nil { t.Fatal("didn't expect error:", err) } if len(outAddr) != 1 { t.Fatal("expected 1 item, got", len(outAddr)) } if outAddr[0] != (common.Address{1}) { t.Errorf("expected %x, got %x", common.Address{1}, outAddr[0]) } // marshal multiple address slice buff.Reset() buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040")) // offset buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000080")) // offset buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // size buff.Write(common.Hex2Bytes("0000000000000000000000000100000000000000000000000000000000000000")) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002")) // size buff.Write(common.Hex2Bytes("0000000000000000000000000200000000000000000000000000000000000000")) buff.Write(common.Hex2Bytes("0000000000000000000000000300000000000000000000000000000000000000")) var outAddrStruct struct { A []common.Address B []common.Address } err = abi.Unpack(&outAddrStruct, "addressSliceDouble", buff.Bytes()) if err != nil { t.Fatal("didn't expect error:", err) } if len(outAddrStruct.A) != 1 { t.Fatal("expected 1 item, got", len(outAddrStruct.A)) } if outAddrStruct.A[0] != (common.Address{1}) { t.Errorf("expected %x, got %x", common.Address{1}, outAddrStruct.A[0]) } if len(outAddrStruct.B) != 2 { t.Fatal("expected 1 item, got", len(outAddrStruct.B)) } if outAddrStruct.B[0] != (common.Address{2}) { t.Errorf("expected %x, got %x", common.Address{2}, outAddrStruct.B[0]) } if outAddrStruct.B[1] != (common.Address{3}) { t.Errorf("expected %x, got %x", common.Address{3}, outAddrStruct.B[1]) } // marshal invalid address slice buff.Reset() buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000100")) err = abi.Unpack(&outAddr, "addressSliceSingle", buff.Bytes()) if err == nil { t.Fatal("expected error:", err) } } func TestUnpackTuple(t *testing.T) { const simpleTuple = `[{"name":"tuple","constant":false,"outputs":[{"type":"tuple","name":"ret","components":[{"type":"int256","name":"a"},{"type":"int256","name":"b"}]}]}]` abi, err := JSON(strings.NewReader(simpleTuple)) if err != nil { t.Fatal(err) } buff := new(bytes.Buffer) buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // ret[a] = 1 buff.Write(common.Hex2Bytes("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")) // ret[b] = -1 v := struct { Ret struct { A *big.Int B *big.Int } }{Ret: struct { A *big.Int B *big.Int }{new(big.Int), new(big.Int)}} err = abi.Unpack(&v, "tuple", buff.Bytes()) if err != nil { t.Error(err) } else { if v.Ret.A.Cmp(big.NewInt(1)) != 0 { t.Errorf("unexpected value unpacked: want %x, got %x", 1, v.Ret.A) } if v.Ret.B.Cmp(big.NewInt(-1)) != 0 { t.Errorf("unexpected value unpacked: want %x, got %x", v.Ret.B, -1) } } // Test nested tuple const nestedTuple = `[{"name":"tuple","constant":false,"outputs":[ {"type":"tuple","name":"s","components":[{"type":"uint256","name":"a"},{"type":"uint256[]","name":"b"},{"type":"tuple[]","name":"c","components":[{"name":"x", "type":"uint256"},{"name":"y","type":"uint256"}]}]}, {"type":"tuple","name":"t","components":[{"name":"x", "type":"uint256"},{"name":"y","type":"uint256"}]}, {"type":"uint256","name":"a"} ]}]` abi, err = JSON(strings.NewReader(nestedTuple)) if err != nil { t.Fatal(err) } buff.Reset() buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000080")) // s offset buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000000")) // t.X = 0 buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // t.Y = 1 buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // a = 1 buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // s.A = 1 buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000060")) // s.B offset buff.Write(common.Hex2Bytes("00000000000000000000000000000000000000000000000000000000000000c0")) // s.C offset buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002")) // s.B length buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // s.B[0] = 1 buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002")) // s.B[0] = 2 buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002")) // s.C length buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // s.C[0].X buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002")) // s.C[0].Y buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002")) // s.C[1].X buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // s.C[1].Y type T struct { X *big.Int `abi:"x"` Z *big.Int `abi:"y"` // Test whether the abi tag works. } type S struct { A *big.Int B []*big.Int C []T } type Ret struct { FieldS S `abi:"s"` FieldT T `abi:"t"` A *big.Int } var ret Ret var expected = Ret{ FieldS: S{ A: big.NewInt(1), B: []*big.Int{big.NewInt(1), big.NewInt(2)}, C: []T{ {big.NewInt(1), big.NewInt(2)}, {big.NewInt(2), big.NewInt(1)}, }, }, FieldT: T{ big.NewInt(0), big.NewInt(1), }, A: big.NewInt(1), } err = abi.Unpack(&ret, "tuple", buff.Bytes()) if err != nil { t.Error(err) } if reflect.DeepEqual(ret, expected) { t.Error("unexpected unpack value") } } func TestOOMMaliciousInput(t *testing.T) { oomTests := []unpackTest{ { def: `[{"type": "uint8[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020" + // offset "0000000000000000000000000000000000000000000000000000000000000003" + // num elems "0000000000000000000000000000000000000000000000000000000000000001" + // elem 1 "0000000000000000000000000000000000000000000000000000000000000002", // elem 2 }, { // Length larger than 64 bits def: `[{"type": "uint8[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020" + // offset "00ffffffffffffffffffffffffffffffffffffffffffffff0000000000000002" + // num elems "0000000000000000000000000000000000000000000000000000000000000001" + // elem 1 "0000000000000000000000000000000000000000000000000000000000000002", // elem 2 }, { // Offset very large (over 64 bits) def: `[{"type": "uint8[]"}]`, enc: "00ffffffffffffffffffffffffffffffffffffffffffffff0000000000000020" + // offset "0000000000000000000000000000000000000000000000000000000000000002" + // num elems "0000000000000000000000000000000000000000000000000000000000000001" + // elem 1 "0000000000000000000000000000000000000000000000000000000000000002", // elem 2 }, { // Offset very large (below 64 bits) def: `[{"type": "uint8[]"}]`, enc: "0000000000000000000000000000000000000000000000007ffffffffff00020" + // offset "0000000000000000000000000000000000000000000000000000000000000002" + // num elems "0000000000000000000000000000000000000000000000000000000000000001" + // elem 1 "0000000000000000000000000000000000000000000000000000000000000002", // elem 2 }, { // Offset negative (as 64 bit) def: `[{"type": "uint8[]"}]`, enc: "000000000000000000000000000000000000000000000000f000000000000020" + // offset "0000000000000000000000000000000000000000000000000000000000000002" + // num elems "0000000000000000000000000000000000000000000000000000000000000001" + // elem 1 "0000000000000000000000000000000000000000000000000000000000000002", // elem 2 }, { // Negative length def: `[{"type": "uint8[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020" + // offset "000000000000000000000000000000000000000000000000f000000000000002" + // num elems "0000000000000000000000000000000000000000000000000000000000000001" + // elem 1 "0000000000000000000000000000000000000000000000000000000000000002", // elem 2 }, { // Very large length def: `[{"type": "uint8[]"}]`, enc: "0000000000000000000000000000000000000000000000000000000000000020" + // offset "0000000000000000000000000000000000000000000000007fffffffff000002" + // num elems "0000000000000000000000000000000000000000000000000000000000000001" + // elem 1 "0000000000000000000000000000000000000000000000000000000000000002", // elem 2 }, } for i, test := range oomTests { def := fmt.Sprintf(`[{ "name" : "method", "outputs": %s}]`, test.def) abi, err := JSON(strings.NewReader(def)) if err != nil { t.Fatalf("invalid ABI definition %s: %v", def, err) } encb, err := hex.DecodeString(test.enc) if err != nil { t.Fatalf("invalid hex: %s" + test.enc) } _, err = abi.Methods["method"].Outputs.UnpackValues(encb) if err == nil { t.Fatalf("Expected error on malicious input, test %d", i) } } }