d66593bbfd
This commit exports a new map named OpcodeByName which can be used to lookup an opcode value given a human-readable opcode name. It also modifies the test function which does short form parsing to use the new map instead of the internal array. Closes #267.
557 lines
13 KiB
Go
557 lines
13 KiB
Go
// Copyright (c) 2013-2015 Conformal Systems LLC.
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package txscript
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import (
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"strconv"
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"strings"
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"testing"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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)
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// testName returns a descriptive test name for the given reference test data.
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func testName(test []string) (string, error) {
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var name string
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if len(test) < 3 || len(test) > 4 {
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return name, fmt.Errorf("invalid test length %d", len(test))
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}
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if len(test) == 4 {
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name = fmt.Sprintf("test (%s)", test[3])
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} else {
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name = fmt.Sprintf("test ([%s, %s, %s])", test[0], test[1],
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test[2])
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}
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return name, nil
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}
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// parse hex string into a []byte.
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func parseHex(tok string) ([]byte, error) {
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if !strings.HasPrefix(tok, "0x") {
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return nil, errors.New("not a hex number")
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}
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return hex.DecodeString(tok[2:])
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}
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// parseShortForm parses a string as as used in the Bitcoin Core reference tests
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// into the script it came from.
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func parseShortForm(script string) ([]byte, error) {
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ops := make(map[string]byte)
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// the format used for these tests is pretty simple if ad-hoc:
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// - opcodes other than the push opcodes and unknown are present as
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// either OP_NAME or just NAME
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// - plain numbers are made into push operations
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// - numbers beginning with 0x are inserted into the []byte as-is (so
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// 0x14 is OP_DATA_20)
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// - single quoted strings are pushed as data.
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// - anything else is an error.
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for opcodeName, opcodeValue := range OpcodeByName {
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if opcodeValue < OP_NOP && opcodeValue != OP_RESERVED {
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continue
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}
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if strings.Contains(opcodeName, "OP_UNKNOWN") {
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continue
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}
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ops[opcodeName] = opcodeValue
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ops[strings.TrimPrefix(opcodeName, "OP_")] = opcodeValue
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}
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// do once, build map.
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// Split only does one separator so convert all \n and tab into space.
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script = strings.Replace(script, "\n", " ", -1)
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script = strings.Replace(script, "\t", " ", -1)
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tokens := strings.Split(script, " ")
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builder := NewScriptBuilder()
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for _, tok := range tokens {
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if len(tok) == 0 {
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continue
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}
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// if parses as a plain number
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if num, err := strconv.ParseInt(tok, 10, 64); err == nil {
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builder.AddInt64(num)
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continue
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} else if bts, err := parseHex(tok); err == nil {
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// naughty...
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builder.script = append(builder.script, bts...)
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} else if len(tok) >= 2 &&
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tok[0] == '\'' && tok[len(tok)-1] == '\'' {
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builder.AddFullData([]byte(tok[1 : len(tok)-1]))
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} else if opcode, ok := ops[tok]; ok {
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builder.AddOp(opcode)
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} else {
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return nil, fmt.Errorf("bad token \"%s\"", tok)
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}
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}
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return builder.Script()
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}
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// parseScriptFlags parses the provided flags string from the format used in the
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// reference tests into ScriptFlags suitable for use in the script engine.
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func parseScriptFlags(flagStr string) (ScriptFlags, error) {
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var flags ScriptFlags
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sFlags := strings.Split(flagStr, ",")
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for _, flag := range sFlags {
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switch flag {
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case "":
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// Nothing.
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case "CLEANSTACK":
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flags |= ScriptVerifyCleanStack
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case "DERSIG":
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flags |= ScriptVerifyDERSignatures
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case "DISCOURAGE_UPGRADABLE_NOPS":
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flags |= ScriptDiscourageUpgradableNops
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case "LOW_S":
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flags |= ScriptVerifyLowS
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case "MINIMALDATA":
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flags |= ScriptVerifyMinimalData
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case "NONE":
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// Nothing.
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case "NULLDUMMY":
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flags |= ScriptStrictMultiSig
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case "P2SH":
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flags |= ScriptBip16
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case "SIGPUSHONLY":
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flags |= ScriptVerifySigPushOnly
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case "STRICTENC":
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flags |= ScriptVerifyStrictEncoding
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default:
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return flags, fmt.Errorf("invalid flag: %s", flag)
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}
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}
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return flags, nil
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}
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// createSpendTx generates a basic spending transaction given the passed
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// signature and public key scripts.
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func createSpendingTx(sigScript, pkScript []byte) *wire.MsgTx {
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coinbaseTx := wire.NewMsgTx()
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outPoint := wire.NewOutPoint(&wire.ShaHash{}, ^uint32(0))
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txIn := wire.NewTxIn(outPoint, []byte{OP_0, OP_0})
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txOut := wire.NewTxOut(0, pkScript)
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coinbaseTx.AddTxIn(txIn)
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coinbaseTx.AddTxOut(txOut)
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spendingTx := wire.NewMsgTx()
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coinbaseTxSha := coinbaseTx.TxSha()
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outPoint = wire.NewOutPoint(&coinbaseTxSha, 0)
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txIn = wire.NewTxIn(outPoint, sigScript)
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txOut = wire.NewTxOut(0, nil)
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spendingTx.AddTxIn(txIn)
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spendingTx.AddTxOut(txOut)
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return spendingTx
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}
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// TestScriptInvalidTests ensures all of the tests in script_invalid.json fail
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// as expected.
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func TestScriptInvalidTests(t *testing.T) {
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file, err := ioutil.ReadFile("data/script_invalid.json")
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if err != nil {
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t.Errorf("TestBitcoindInvalidTests: %v\n", err)
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return
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}
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var tests [][]string
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err = json.Unmarshal(file, &tests)
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if err != nil {
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t.Errorf("TestBitcoindInvalidTests couldn't Unmarshal: %v",
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err)
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return
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}
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for i, test := range tests {
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// Skip comments
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if len(test) == 1 {
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continue
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}
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name, err := testName(test)
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if err != nil {
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t.Errorf("TestBitcoindInvalidTests: invalid test #%d",
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i)
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continue
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}
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scriptSig, err := parseShortForm(test[0])
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if err != nil {
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t.Errorf("%s: can't parse scriptSig; %v", name, err)
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continue
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}
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scriptPubKey, err := parseShortForm(test[1])
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if err != nil {
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t.Errorf("%s: can't parse scriptPubkey; %v", name, err)
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continue
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}
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flags, err := parseScriptFlags(test[2])
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if err != nil {
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t.Errorf("%s: %v", name, err)
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continue
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}
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tx := createSpendingTx(scriptSig, scriptPubKey)
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vm, err := NewEngine(scriptPubKey, tx, 0, flags)
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if err == nil {
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if err := vm.Execute(); err == nil {
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t.Errorf("%s test succeeded when it "+
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"should have failed\n", name)
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}
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continue
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}
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}
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}
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// TestScriptValidTests ensures all of the tests in script_valid.json pass as
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// expected.
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func TestScriptValidTests(t *testing.T) {
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file, err := ioutil.ReadFile("data/script_valid.json")
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if err != nil {
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t.Errorf("TestBitcoinValidTests: %v\n", err)
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return
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}
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var tests [][]string
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err = json.Unmarshal(file, &tests)
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if err != nil {
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t.Errorf("TestBitcoindValidTests couldn't Unmarshal: %v",
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err)
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return
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}
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for i, test := range tests {
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// Skip comments
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if len(test) == 1 {
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continue
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}
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name, err := testName(test)
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if err != nil {
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t.Errorf("TestBitcoindValidTests: invalid test #%d",
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i)
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continue
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}
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scriptSig, err := parseShortForm(test[0])
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if err != nil {
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t.Errorf("%s: can't parse scriptSig; %v", name, err)
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continue
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}
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scriptPubKey, err := parseShortForm(test[1])
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if err != nil {
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t.Errorf("%s: can't parse scriptPubkey; %v", name, err)
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continue
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}
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flags, err := parseScriptFlags(test[2])
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if err != nil {
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t.Errorf("%s: %v", name, err)
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continue
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}
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tx := createSpendingTx(scriptSig, scriptPubKey)
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vm, err := NewEngine(scriptPubKey, tx, 0, flags)
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if err != nil {
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t.Errorf("%s failed to create script: %v", name, err)
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continue
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}
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err = vm.Execute()
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if err != nil {
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t.Errorf("%s failed to execute: %v", name, err)
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continue
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}
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}
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}
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// TestTxInvalidTests ensures all of the tests in tx_invalid.json fail as
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// expected.
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func TestTxInvalidTests(t *testing.T) {
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file, err := ioutil.ReadFile("data/tx_invalid.json")
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if err != nil {
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t.Errorf("TestBitcoindInvalidTests: %v\n", err)
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return
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}
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var tests [][]interface{}
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err = json.Unmarshal(file, &tests)
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if err != nil {
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t.Errorf("TestBitcoindInvalidTests couldn't Unmarshal: %v\n",
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err)
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return
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}
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// form is either:
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// ["this is a comment "]
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// or:
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// [[[previous hash, previous index, previous scriptPubKey]...,]
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// serializedTransaction, verifyFlags]
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testloop:
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for i, test := range tests {
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inputs, ok := test[0].([]interface{})
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if !ok {
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continue
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}
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if len(test) != 3 {
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t.Errorf("bad test (bad length) %d: %v", i, test)
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continue
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}
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serializedhex, ok := test[1].(string)
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if !ok {
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t.Errorf("bad test (arg 2 not string) %d: %v", i, test)
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continue
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}
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serializedTx, err := hex.DecodeString(serializedhex)
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if err != nil {
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t.Errorf("bad test (arg 2 not hex %v) %d: %v", err, i,
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test)
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continue
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}
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tx, err := btcutil.NewTxFromBytes(serializedTx)
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if err != nil {
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t.Errorf("bad test (arg 2 not msgtx %v) %d: %v", err,
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i, test)
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continue
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}
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verifyFlags, ok := test[2].(string)
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if !ok {
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t.Errorf("bad test (arg 3 not string) %d: %v", i, test)
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continue
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}
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flags, err := parseScriptFlags(verifyFlags)
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if err != nil {
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t.Errorf("bad test %d: %v", i, err)
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continue
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}
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prevOuts := make(map[wire.OutPoint][]byte)
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for j, iinput := range inputs {
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input, ok := iinput.([]interface{})
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if !ok {
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t.Errorf("bad test (%dth input not array)"+
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"%d: %v", j, i, test)
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continue testloop
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}
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if len(input) != 3 {
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t.Errorf("bad test (%dth input wrong length)"+
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"%d: %v", j, i, test)
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continue testloop
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}
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previoustx, ok := input[0].(string)
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if !ok {
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t.Errorf("bad test (%dth input sha not string)"+
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"%d: %v", j, i, test)
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continue testloop
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}
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prevhash, err := wire.NewShaHashFromStr(previoustx)
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if err != nil {
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t.Errorf("bad test (%dth input sha not sha %v)"+
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"%d: %v", j, err, i, test)
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continue testloop
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}
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idxf, ok := input[1].(float64)
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if !ok {
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t.Errorf("bad test (%dth input idx not number)"+
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"%d: %v", j, i, test)
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continue testloop
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}
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idx := uint32(idxf) // (floor(idxf) == idxf?)
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oscript, ok := input[2].(string)
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if !ok {
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t.Errorf("bad test (%dth input script not "+
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"string) %d: %v", j, i, test)
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continue testloop
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}
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script, err := parseShortForm(oscript)
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if err != nil {
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t.Errorf("bad test (%dth input script doesn't "+
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"parse %v) %d: %v", j, err, i, test)
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continue testloop
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}
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prevOuts[*wire.NewOutPoint(prevhash, idx)] = script
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}
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for k, txin := range tx.MsgTx().TxIn {
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pkScript, ok := prevOuts[txin.PreviousOutPoint]
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if !ok {
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t.Errorf("bad test (missing %dth input) %d:%v",
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k, i, test)
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continue testloop
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}
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// These are meant to fail, so as soon as the first
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// input fails the transaction has failed. (some of the
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// test txns have good inputs, too..
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vm, err := NewEngine(pkScript, tx.MsgTx(), k, flags)
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if err != nil {
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continue testloop
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}
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err = vm.Execute()
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if err != nil {
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continue testloop
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}
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}
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t.Errorf("test (%d:%v) succeeded when should fail",
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i, test)
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}
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}
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// TestTxValidTests ensures all of the tests in tx_valid.json pass as expected.
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func TestTxValidTests(t *testing.T) {
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file, err := ioutil.ReadFile("data/tx_valid.json")
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if err != nil {
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t.Errorf("TestBitcoindInvalidTests: %v\n", err)
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return
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}
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var tests [][]interface{}
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err = json.Unmarshal(file, &tests)
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if err != nil {
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t.Errorf("TestBitcoindInvalidTests couldn't Unmarshal: %v\n",
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err)
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return
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}
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// form is either:
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// ["this is a comment "]
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// or:
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// [[[previous hash, previous index, previous scriptPubKey]...,]
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// serializedTransaction, verifyFlags]
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testloop:
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for i, test := range tests {
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inputs, ok := test[0].([]interface{})
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if !ok {
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continue
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}
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if len(test) != 3 {
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t.Errorf("bad test (bad length) %d: %v", i, test)
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continue
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}
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serializedhex, ok := test[1].(string)
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if !ok {
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t.Errorf("bad test (arg 2 not string) %d: %v", i, test)
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continue
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}
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serializedTx, err := hex.DecodeString(serializedhex)
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if err != nil {
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t.Errorf("bad test (arg 2 not hex %v) %d: %v", err, i,
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test)
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continue
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}
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tx, err := btcutil.NewTxFromBytes(serializedTx)
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if err != nil {
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t.Errorf("bad test (arg 2 not msgtx %v) %d: %v", err,
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i, test)
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continue
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}
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verifyFlags, ok := test[2].(string)
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if !ok {
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t.Errorf("bad test (arg 3 not string) %d: %v", i, test)
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continue
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}
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flags, err := parseScriptFlags(verifyFlags)
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if err != nil {
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t.Errorf("bad test %d: %v", i, err)
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continue
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}
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prevOuts := make(map[wire.OutPoint][]byte)
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for j, iinput := range inputs {
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input, ok := iinput.([]interface{})
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if !ok {
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t.Errorf("bad test (%dth input not array)"+
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"%d: %v", j, i, test)
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continue
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}
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if len(input) != 3 {
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t.Errorf("bad test (%dth input wrong length)"+
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"%d: %v", j, i, test)
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continue
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}
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previoustx, ok := input[0].(string)
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if !ok {
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t.Errorf("bad test (%dth input sha not string)"+
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"%d: %v", j, i, test)
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continue
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}
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prevhash, err := wire.NewShaHashFromStr(previoustx)
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if err != nil {
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t.Errorf("bad test (%dth input sha not sha %v)"+
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"%d: %v", j, err, i, test)
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continue
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}
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idxf, ok := input[1].(float64)
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if !ok {
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t.Errorf("bad test (%dth input idx not number)"+
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"%d: %v", j, i, test)
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continue
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}
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idx := uint32(idxf) // (floor(idxf) == idxf?)
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oscript, ok := input[2].(string)
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if !ok {
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t.Errorf("bad test (%dth input script not "+
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"string) %d: %v", j, i, test)
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continue
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}
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script, err := parseShortForm(oscript)
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if err != nil {
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t.Errorf("bad test (%dth input script doesn't "+
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"parse %v) %d: %v", j, err, i, test)
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continue
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}
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prevOuts[*wire.NewOutPoint(prevhash, idx)] = script
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}
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for k, txin := range tx.MsgTx().TxIn {
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pkScript, ok := prevOuts[txin.PreviousOutPoint]
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if !ok {
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t.Errorf("bad test (missing %dth input) %d:%v",
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k, i, test)
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continue testloop
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}
|
|
vm, err := NewEngine(pkScript, tx.MsgTx(), k, flags)
|
|
if err != nil {
|
|
t.Errorf("test (%d:%v:%d) failed to create "+
|
|
"script: %v", i, test, k, err)
|
|
continue
|
|
}
|
|
|
|
err = vm.Execute()
|
|
if err != nil {
|
|
t.Errorf("test (%d:%v:%d) failed to execute: "+
|
|
"%v", i, test, k, err)
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
}
|