Exemple #1
0
func DecodeTx(tx *btc.Tx) (s string, missinginp bool, totinp, totout uint64, e error) {
	s += fmt.Sprintln("Transaction details (for your information):")
	s += fmt.Sprintln(len(tx.TxIn), "Input(s):")
	for i := range tx.TxIn {
		s += fmt.Sprintf(" %3d %s", i, tx.TxIn[i].Input.String())
		var po *btc.TxOut

		inpid := btc.NewUint256(tx.TxIn[i].Input.Hash[:])
		if txinmem, ok := network.TransactionsToSend[inpid.BIdx()]; ok {
			s += fmt.Sprint(" mempool")
			if int(tx.TxIn[i].Input.Vout) >= len(txinmem.TxOut) {
				s += fmt.Sprintf(" - Vout TOO BIG (%d/%d)!", int(tx.TxIn[i].Input.Vout), len(txinmem.TxOut))
			} else {
				po = txinmem.TxOut[tx.TxIn[i].Input.Vout]
			}
		} else {
			po, _ = common.BlockChain.Unspent.UnspentGet(&tx.TxIn[i].Input)
			if po != nil {
				s += fmt.Sprintf("%8d", po.BlockHeight)
			}
		}
		if po != nil {
			ok := script.VerifyTxScript(tx.TxIn[i].ScriptSig, po.Pk_script, i, tx, script.VER_P2SH|script.VER_DERSIG)
			if !ok {
				s += fmt.Sprintln("\nERROR: The transacion does not have a valid signature.")
				e = errors.New("Invalid signature")
				return
			}
			totinp += po.Value

			ads := "???"
			if ad := btc.NewAddrFromPkScript(po.Pk_script, common.Testnet); ad != nil {
				ads = ad.String()
			}
			s += fmt.Sprintf(" %15.8f BTC @ %s\n", float64(po.Value)/1e8, ads)
		} else {
			s += fmt.Sprintln(" - UNKNOWN INPUT")
			missinginp = true
		}
	}
	s += fmt.Sprintln(len(tx.TxOut), "Output(s):")
	for i := range tx.TxOut {
		totout += tx.TxOut[i].Value
		adr := btc.NewAddrFromPkScript(tx.TxOut[i].Pk_script, common.Testnet)
		if adr != nil {
			s += fmt.Sprintf(" %15.8f BTC to adr %s\n", float64(tx.TxOut[i].Value)/1e8, adr.String())
		} else {
			s += fmt.Sprintf(" %15.8f BTC to scr %s\n", float64(tx.TxOut[i].Value)/1e8, hex.EncodeToString(tx.TxOut[i].Pk_script))
		}
	}
	if missinginp {
		s += fmt.Sprintln("WARNING: There are missing inputs and we cannot calc input BTC amount.")
		s += fmt.Sprintln("If there is somethign wrong with this transaction, you can loose money...")
	} else {
		s += fmt.Sprintf("All OK: %.8f BTC in -> %.8f BTC out, with %.8f BTC fee\n", float64(totinp)/1e8,
			float64(totout)/1e8, float64(totinp-totout)/1e8)
	}
	return
}
Exemple #2
0
func output_tx_xml(w http.ResponseWriter, id string) {
	txid := btc.NewUint256FromString(id)
	w.Write([]byte("<tx>"))
	fmt.Fprint(w, "<id>", id, "</id>")
	if t2s, ok := network.TransactionsToSend[txid.BIdx()]; ok {
		w.Write([]byte("<status>OK</status>"))
		tx := t2s.Tx
		w.Write([]byte("<inputs>"))
		for i := range tx.TxIn {
			w.Write([]byte("<input>"))
			var po *btc.TxOut
			inpid := btc.NewUint256(tx.TxIn[i].Input.Hash[:])
			if txinmem, ok := network.TransactionsToSend[inpid.BIdx()]; ok {
				if int(tx.TxIn[i].Input.Vout) < len(txinmem.TxOut) {
					po = txinmem.TxOut[tx.TxIn[i].Input.Vout]
				}
			} else {
				po, _ = common.BlockChain.Unspent.UnspentGet(&tx.TxIn[i].Input)
			}
			if po != nil {
				ok := script.VerifyTxScript(tx.TxIn[i].ScriptSig, po.Pk_script, i, tx, script.VER_P2SH|script.VER_DERSIG)
				if !ok {
					w.Write([]byte("<status>Script FAILED</status>"))
				} else {
					w.Write([]byte("<status>OK</status>"))
				}
				fmt.Fprint(w, "<value>", po.Value, "</value>")
				ads := "???"
				if ad := btc.NewAddrFromPkScript(po.Pk_script, common.Testnet); ad != nil {
					ads = ad.String()
				}
				fmt.Fprint(w, "<addr>", ads, "</addr>")
				fmt.Fprint(w, "<block>", po.BlockHeight, "</block>")
			} else {
				w.Write([]byte("<status>UNKNOWN INPUT</status>"))
			}
			w.Write([]byte("</input>"))
		}
		w.Write([]byte("</inputs>"))

		w.Write([]byte("<outputs>"))
		for i := range tx.TxOut {
			w.Write([]byte("<output>"))
			fmt.Fprint(w, "<value>", tx.TxOut[i].Value, "</value>")
			adr := btc.NewAddrFromPkScript(tx.TxOut[i].Pk_script, common.Testnet)
			if adr != nil {
				fmt.Fprint(w, "<addr>", adr.String(), "</addr>")
			} else {
				fmt.Fprint(w, "<addr>", "scr:"+hex.EncodeToString(tx.TxOut[i].Pk_script), "</addr>")
			}
			w.Write([]byte("</output>"))
		}
		w.Write([]byte("</outputs>"))
	} else {
		w.Write([]byte("<status>Not found</status>"))
	}
	w.Write([]byte("</tx>"))
}
Exemple #3
0
// This isusually the most time consuming process when applying a new block
func (ch *Chain) commitTxs(bl *btc.Block, changes *BlockChanges) (e error) {
	sumblockin := btc.GetBlockReward(changes.Height)
	var txoutsum, txinsum, sumblockout uint64

	if int(changes.Height)+UnwindBufferMaxHistory >= int(changes.LastKnownHeight) {
		changes.UndoData = make(map[[32]byte]*QdbRec)
	}

	// Add each tx outs from the current block to the temporary pool
	blUnsp := make(map[[32]byte][]*btc.TxOut, 4*len(bl.Txs))
	for i := range bl.Txs {
		outs := make([]*btc.TxOut, len(bl.Txs[i].TxOut))
		copy(outs, bl.Txs[i].TxOut)
		blUnsp[bl.Txs[i].Hash.Hash] = outs
	}

	// create a channnel to receive results from VerifyScript threads:
	done := make(chan bool, sys.UseThreads)

	for i := range bl.Txs {
		txoutsum, txinsum = 0, 0

		// Check each tx for a valid input, except from the first one
		if i > 0 {
			tx_trusted := bl.Trusted
			if !tx_trusted && TrustedTxChecker != nil && TrustedTxChecker(bl.Txs[i].Hash) {
				tx_trusted = true
			}

			scripts_ok := true

			for j := 0; j < sys.UseThreads; j++ {
				done <- true
			}

			for j := 0; j < len(bl.Txs[i].TxIn); /*&& e==nil*/ j++ {
				inp := &bl.Txs[i].TxIn[j].Input
				spendrec, waspent := changes.DeledTxs[inp.Hash]
				if waspent && spendrec[inp.Vout] {
					println("txin", inp.String(), "already spent in this block")
					e = errors.New("Input spent more then once in same block")
					break
				}
				tout := ch.PickUnspent(inp)
				if tout == nil {
					t, ok := blUnsp[inp.Hash]
					if !ok {
						e = errors.New("Unknown input TxID: " + btc.NewUint256(inp.Hash[:]).String())
						break
					}

					if inp.Vout >= uint32(len(t)) {
						println("Vout too big", len(t), inp.String())
						e = errors.New("Vout too big")
						break
					}

					if t[inp.Vout] == nil {
						println("Vout already spent", inp.String())
						e = errors.New("Vout already spent")
						break
					}

					if t[inp.Vout].WasCoinbase {
						e = errors.New("Cannot spend block's own coinbase in TxID: " + btc.NewUint256(inp.Hash[:]).String())
						break
					}

					tout = t[inp.Vout]
					t[inp.Vout] = nil // and now mark it as spent:
				} else {
					if tout.WasCoinbase && changes.Height-tout.BlockHeight < COINBASE_MATURITY {
						e = errors.New("Trying to spend prematured coinbase: " + btc.NewUint256(inp.Hash[:]).String())
						break
					}
					// it is confirmed already so delete it later
					if !waspent {
						spendrec = make([]bool, tout.VoutCount)
						changes.DeledTxs[inp.Hash] = spendrec
					}
					spendrec[inp.Vout] = true

					if changes.UndoData != nil {
						var urec *QdbRec
						urec = changes.UndoData[inp.Hash]
						if urec == nil {
							urec = new(QdbRec)
							urec.TxID = inp.Hash
							urec.Coinbase = tout.WasCoinbase
							urec.InBlock = tout.BlockHeight
							urec.Outs = make([]*QdbTxOut, tout.VoutCount)
							changes.UndoData[inp.Hash] = urec
						}
						tmp := new(QdbTxOut)
						tmp.Value = tout.Value
						tmp.PKScr = make([]byte, len(tout.Pk_script))
						copy(tmp.PKScr, tout.Pk_script)
						urec.Outs[inp.Vout] = tmp
					}
				}

				if !(<-done) {
					println("VerifyScript error 1")
					scripts_ok = false
					break
				}

				if tx_trusted {
					done <- true
				} else {
					go func(sig []byte, prv []byte, i int, tx *btc.Tx) {
						done <- script.VerifyTxScript(sig, prv, i, tx, bl.VerifyFlags)
					}(bl.Txs[i].TxIn[j].ScriptSig, tout.Pk_script, j, bl.Txs[i])
				}

				txinsum += tout.Value
			}

			if scripts_ok {
				scripts_ok = <-done
			}
			for j := 1; j < sys.UseThreads; j++ {
				if !(<-done) {
					println("VerifyScript error 2")
					scripts_ok = false
				}
			}
			if len(done) != 0 {
				panic("ASSERT: The channel should be empty gere")
			}

			if !scripts_ok {
				return errors.New("VerifyScripts failed")
			}
		} else {
			// For coinbase tx we need to check (like satoshi) whether the script size is between 2 and 100 bytes
			// (Previously we made sure in CheckBlock() that this was a coinbase type tx)
			if len(bl.Txs[0].TxIn[0].ScriptSig) < 2 || len(bl.Txs[0].TxIn[0].ScriptSig) > 100 {
				return errors.New(fmt.Sprint("Coinbase script has a wrong length", len(bl.Txs[0].TxIn[0].ScriptSig)))
			}
		}
		sumblockin += txinsum

		for j := range bl.Txs[i].TxOut {
			txoutsum += bl.Txs[i].TxOut[j].Value
		}
		sumblockout += txoutsum

		if e != nil {
			return // If any input fails, do not continue
		}
		if i > 0 && txoutsum > txinsum {
			return errors.New(fmt.Sprintf("More spent (%.8f) than at the input (%.8f) in TX %s",
				float64(txoutsum)/1e8, float64(txinsum)/1e8, bl.Txs[i].Hash.String()))
		}
	}

	if sumblockin < sumblockout {
		return errors.New(fmt.Sprintf("Out:%d > In:%d", sumblockout, sumblockin))
	}

	var rec *QdbRec
	for k, v := range blUnsp {
		for i := range v {
			if v[i] != nil {
				if rec == nil {
					rec = new(QdbRec)
					rec.TxID = k
					rec.Coinbase = v[i].WasCoinbase
					rec.InBlock = changes.Height
					rec.Outs = make([]*QdbTxOut, len(v))
				}
				rec.Outs[i] = &QdbTxOut{Value: v[i].Value, PKScr: v[i].Pk_script}
			}
		}
		if rec != nil {
			changes.AddList = append(changes.AddList, rec)
			rec = nil
		}
	}

	return nil
}
Exemple #4
0
// Must be called from the chain's thread
func HandleNetTx(ntx *TxRcvd, retry bool) (accepted bool) {
	common.CountSafe("HandleNetTx")

	tx := ntx.tx
	var totinp, totout uint64
	var frommem bool

	TxMutex.Lock()

	if !retry {
		if _, present := TransactionsPending[tx.Hash.BIdx()]; !present {
			// It had to be mined in the meantime, so just drop it now
			TxMutex.Unlock()
			common.CountSafe("TxNotPending")
			return
		}
		delete(TransactionsPending, ntx.tx.Hash.BIdx())
	} else {
		// In case case of retry, it is on the rejected list,
		// ... so remove it now to free any tied WaitingForInputs
		deleteRejected(tx.Hash.BIdx())
	}

	pos := make([]*btc.TxOut, len(tx.TxIn))
	spent := make([]uint64, len(tx.TxIn))

	// Check if all the inputs exist in the chain
	for i := range tx.TxIn {
		spent[i] = tx.TxIn[i].Input.UIdx()

		if _, ok := SpentOutputs[spent[i]]; ok {
			RejectTx(ntx.tx.Hash, len(ntx.raw), TX_REJECTED_DOUBLE_SPEND)
			TxMutex.Unlock()
			common.CountSafe("TxRejectedDoubleSpnd")
			return
		}

		inptx := btc.NewUint256(tx.TxIn[i].Input.Hash[:])
		if txinmem, ok := TransactionsToSend[inptx.BIdx()]; common.CFG.TXPool.AllowMemInputs && ok {
			if int(tx.TxIn[i].Input.Vout) >= len(txinmem.TxOut) {
				RejectTx(ntx.tx.Hash, len(ntx.raw), TX_REJECTED_BAD_INPUT)
				TxMutex.Unlock()
				common.CountSafe("TxRejectedBadInput")
				return
			}
			pos[i] = txinmem.TxOut[tx.TxIn[i].Input.Vout]
			common.CountSafe("TxInputInMemory")
			frommem = true
		} else {
			pos[i], _ = common.BlockChain.Unspent.UnspentGet(&tx.TxIn[i].Input)
			if pos[i] == nil {
				var newone bool

				if !common.CFG.TXPool.AllowMemInputs {
					RejectTx(ntx.tx.Hash, len(ntx.raw), TX_REJECTED_NOT_MINED)
					TxMutex.Unlock()
					common.CountSafe("TxRejectedMemInput")
					return
				}
				// In this case, let's "save" it for later...
				missingid := btc.NewUint256(tx.TxIn[i].Input.Hash[:])
				nrtx := RejectTx(ntx.tx.Hash, len(ntx.raw), TX_REJECTED_NO_TXOU)

				if nrtx != nil {
					nrtx.Wait4Input = &Wait4Input{missingTx: missingid, TxRcvd: ntx}

					// Add to waiting list:
					var rec *OneWaitingList
					if rec, _ = WaitingForInputs[nrtx.Wait4Input.missingTx.BIdx()]; rec == nil {
						rec = new(OneWaitingList)
						rec.TxID = nrtx.Wait4Input.missingTx
						rec.Ids = make(map[[btc.Uint256IdxLen]byte]time.Time)
						newone = true
					}
					rec.Ids[tx.Hash.BIdx()] = time.Now()
					WaitingForInputs[nrtx.Wait4Input.missingTx.BIdx()] = rec
				}

				TxMutex.Unlock()
				if newone {
					common.CountSafe("TxRejectedNoInpNew")
				} else {
					common.CountSafe("TxRejectedNoInpOld")
				}
				return
			}
		}
		totinp += pos[i].Value
	}

	// Check if total output value does not exceed total input
	minout := uint64(btc.MAX_MONEY)
	for i := range tx.TxOut {
		if tx.TxOut[i].Value < atomic.LoadUint64(&common.CFG.TXPool.MinVoutValue) {
			RejectTx(ntx.tx.Hash, len(ntx.raw), TX_REJECTED_DUST)
			TxMutex.Unlock()
			common.CountSafe("TxRejectedDust")
			return
		}
		if tx.TxOut[i].Value < minout {
			minout = tx.TxOut[i].Value
		}
		totout += tx.TxOut[i].Value
	}

	if totout > totinp {
		RejectTx(ntx.tx.Hash, len(ntx.raw), TX_REJECTED_OVERSPEND)
		TxMutex.Unlock()
		ntx.conn.DoS("TxOverspend")
		return
	}

	// Check for a proper fee
	fee := totinp - totout
	if fee < (uint64(len(ntx.raw)) * atomic.LoadUint64(&common.CFG.TXPool.FeePerByte)) {
		RejectTx(ntx.tx.Hash, len(ntx.raw), TX_REJECTED_LOW_FEE)
		TxMutex.Unlock()
		common.CountSafe("TxRejectedLowFee")
		return
	}

	// Verify scripts
	for i := range tx.TxIn {
		if !script.VerifyTxScript(tx.TxIn[i].ScriptSig, pos[i].Pk_script, i, tx, script.VER_P2SH|script.VER_DERSIG) {
			RejectTx(ntx.tx.Hash, len(ntx.raw), TX_REJECTED_SCRIPT_FAIL)
			TxMutex.Unlock()
			ntx.conn.DoS("TxScriptFail")
			return
		}
	}

	rec := &OneTxToSend{Data: ntx.raw, Spent: spent, Volume: totinp, Fee: fee, Firstseen: time.Now(), Tx: tx, Minout: minout}
	TransactionsToSend[tx.Hash.BIdx()] = rec
	TransactionsToSendSize += uint64(len(rec.Data))
	for i := range spent {
		SpentOutputs[spent[i]] = tx.Hash.BIdx()
	}

	wtg := WaitingForInputs[tx.Hash.BIdx()]
	if wtg != nil {
		defer RetryWaitingForInput(wtg) // Redo waiting txs when leaving this function
	}

	TxMutex.Unlock()
	common.CountSafe("TxAccepted")

	if frommem {
		// Gocoin does not route txs that need unconfirmed inputs
		rec.Blocked = TX_REJECTED_NOT_MINED
		common.CountSafe("TxRouteNotMined")
	} else if isRoutable(rec) {
		rec.Invsentcnt += NetRouteInv(1, tx.Hash, ntx.conn)
		common.CountSafe("TxRouteOK")
	}

	accepted = true
	return
}