// LTC signing uses different seed string
func HashFromMessage(msg []byte, out []byte) {
const MessageMagic = "Litecoin Signed Message:\n"
b := new(bytes.Buffer)
btc.WriteVlen(b, uint64(len(MessageMagic)))
b.Write([]byte(MessageMagic))
btc.WriteVlen(b, uint64(len(msg)))
b.Write(msg)
btc.ShaHash(b.Bytes(), out)
}
func main() {
if len(os.Args) != 5 {
fmt.Println("This tool needs to be executed with 4 arguments:")
fmt.Println(" 1) Name of the unsigned transaction file")
fmt.Println(" 2) Input index to add the key & signature to")
fmt.Println(" 3) Hex dump of the canonical signature")
fmt.Println(" 4) Hex dump of the public key")
return
}
tx := raw_tx_from_file(os.Args[1])
if tx == nil {
return
}
in, er := strconv.ParseUint(os.Args[2], 10, 32)
if er != nil {
println("Input index:", er.Error())
return
}
if int(in) >= len(tx.TxIn) {
println("Input index too big:", int(in), "/", len(tx.TxIn))
return
}
sig, er := hex.DecodeString(os.Args[3])
if er != nil {
println("Signature:", er.Error())
return
}
pk, er := hex.DecodeString(os.Args[4])
if er != nil {
println("Public key:", er.Error())
return
}
buf := new(bytes.Buffer)
btc.WriteVlen(buf, uint64(len(sig)))
buf.Write(sig)
btc.WriteVlen(buf, uint64(len(pk)))
buf.Write(pk)
tx.TxIn[in].ScriptSig = buf.Bytes()
write_tx_file(tx)
}
func (c *OneConnection) SendOwnAddr() {
if ExternalAddrLen() > 0 {
buf := new(bytes.Buffer)
btc.WriteVlen(buf, uint64(1))
binary.Write(buf, binary.LittleEndian, uint32(time.Now().Unix()))
buf.Write(BestExternalAddr())
c.SendRawMsg("addr", buf.Bytes())
}
}
func (c *OneConnection) SendAddr() {
pers := peersdb.GetBestPeers(MaxAddrsPerMessage, nil)
if len(pers) > 0 {
buf := new(bytes.Buffer)
btc.WriteVlen(buf, uint64(len(pers)))
for i := range pers {
binary.Write(buf, binary.LittleEndian, pers[i].Time)
buf.Write(pers[i].NetAddr.Bytes())
}
c.SendRawMsg("addr", buf.Bytes())
}
}
func (c *OneConnection) SendInvs() (res bool) {
b := new(bytes.Buffer)
c.Mutex.Lock()
if len(c.PendingInvs) > 0 {
btc.WriteVlen(b, uint64(len(c.PendingInvs)))
for i := range c.PendingInvs {
b.Write((*c.PendingInvs[i])[:])
}
res = true
}
c.PendingInvs = nil
c.Mutex.Unlock()
if res {
c.SendRawMsg("inv", b.Bytes())
}
return
}
func (c *OneConnection) GetBlocks(pl []byte) {
h2get, hashstop, e := parseLocatorsPayload(pl)
if e != nil || len(h2get) < 1 || hashstop == nil {
println("GetBlocks: error parsing payload from", c.PeerAddr.Ip())
c.DoS("BadGetBlks")
return
}
invs := make(map[[32]byte]bool, 500)
for i := range h2get {
common.BlockChain.BlockIndexAccess.Lock()
if bl, ok := common.BlockChain.BlockIndex[h2get[i].BIdx()]; ok {
// make sure that this block is in our main chain
common.Last.Mutex.Lock()
end := common.Last.Block
common.Last.Mutex.Unlock()
for ; end != nil && end.Height >= bl.Height; end = end.Parent {
if end == bl {
addInvBlockBranch(invs, bl, hashstop) // Yes - this is the main chain
if common.DebugLevel > 0 {
fmt.Println(c.PeerAddr.Ip(), "getblocks from", bl.Height,
"stop at", hashstop.String(), "->", len(invs), "invs")
}
if len(invs) > 0 {
common.BlockChain.BlockIndexAccess.Unlock()
inv := new(bytes.Buffer)
btc.WriteVlen(inv, uint64(len(invs)))
for k, _ := range invs {
binary.Write(inv, binary.LittleEndian, uint32(2))
inv.Write(k[:])
}
c.SendRawMsg("inv", inv.Bytes())
return
}
}
}
}
common.BlockChain.BlockIndexAccess.Unlock()
}
common.CountSafe("GetblksMissed")
return
}
// Handle getheaders protocol command
// https://en.bitcoin.it/wiki/Protocol_specification#getheaders
func (c *OneConnection) GetHeaders(pl []byte) {
h2get, hashstop, e := parseLocatorsPayload(pl)
if e != nil || hashstop == nil {
println("GetHeaders: error parsing payload from", c.PeerAddr.Ip())
c.DoS("BadGetHdrs")
return
}
if common.DebugLevel > 1 {
println("GetHeaders", len(h2get), hashstop.String())
}
var best_block, last_block *chain.BlockTreeNode
common.BlockChain.BlockIndexAccess.Lock()
if len(h2get) > 0 {
for i := range h2get {
if bl, ok := common.BlockChain.BlockIndex[h2get[i].BIdx()]; ok {
if best_block == nil || bl.Height > best_block.Height {
best_block = bl
}
}
}
} else {
best_block = common.BlockChain.BlockIndex[hashstop.BIdx()]
}
last_block = common.BlockChain.BlockTreeEnd
common.BlockChain.BlockIndexAccess.Unlock()
var resp []byte
var cnt uint32
for cnt < 2000 {
best_block = best_block.FindPathTo(last_block)
if best_block == nil {
break
}
resp = append(resp, append(best_block.BlockHeader[:], 0)...) // 81st byte is always zero
cnt++
}
out := new(bytes.Buffer)
btc.WriteVlen(out, uint64(cnt))
out.Write(resp)
c.SendRawMsg("headers", out.Bytes())
return
}
func (c *OneConnection) ProcessInv(pl []byte) {
if len(pl) < 37 {
println(c.PeerAddr.Ip(), "inv payload too short", len(pl))
return
}
c.InvsRecieved++
cnt, of := btc.VLen(pl)
if len(pl) != of+36*cnt {
println("inv payload length mismatch", len(pl), of, cnt)
}
var blinv2ask []byte
for i := 0; i < cnt; i++ {
typ := binary.LittleEndian.Uint32(pl[of : of+4])
common.CountSafe(fmt.Sprint("InvGot", typ))
if typ == 2 {
if blockWanted(pl[of+4 : of+36]) {
blinv2ask = append(blinv2ask, pl[of+4:of+36]...)
}
} else if typ == 1 {
if common.CFG.TXPool.Enabled {
c.TxInvNotify(pl[of+4 : of+36])
}
}
of += 36
}
if len(blinv2ask) > 0 {
bu := new(bytes.Buffer)
btc.WriteVlen(bu, uint64(len(blinv2ask)/32))
for i := 0; i < len(blinv2ask); i += 32 {
bh := btc.NewUint256(blinv2ask[i : i+32])
c.Mutex.Lock()
c.GetBlockInProgress[bh.BIdx()] = &oneBlockDl{hash: bh, start: time.Now()}
c.Mutex.Unlock()
binary.Write(bu, binary.LittleEndian, uint32(2))
bu.Write(bh.Hash[:])
}
c.SendRawMsg("getdata", bu.Bytes())
}
return
}
// Commit the given add/del transactions to UTXO and Wnwind DBs
func (db *UnspentDB) CommitBlockTxs(changes *BlockChanges, blhash []byte) (e error) {
undo_fn := fmt.Sprint(db.dir, changes.Height)
if changes.UndoData != nil || (changes.Height%UnwindBufferMaxHistory) == 0 {
bu := new(bytes.Buffer)
bu.Write(blhash)
if changes.UndoData != nil {
for _, xx := range changes.UndoData {
bin := xx.Serialize(true)
btc.WriteVlen(bu, uint64(len(bin)))
bu.Write(bin)
}
}
ioutil.WriteFile(db.dir+"tmp", bu.Bytes(), 0666)
os.Rename(db.dir+"tmp", undo_fn+".tmp")
}
db.nosync()
db.commit(changes)
if changes.LastKnownHeight <= changes.Height {
db.Sync()
}
os.Rename(undo_fn+".tmp", undo_fn)
if db.LastBlockHash == nil {
db.LastBlockHash = make([]byte, 32)
}
copy(db.LastBlockHash, blhash)
db.LastBlockHeight = changes.Height
if changes.Height > UnwindBufferMaxHistory {
os.Remove(fmt.Sprint(db.dir, changes.Height-UnwindBufferMaxHistory))
}
return
}
func (c *one_net_conn) getnextblock() {
if len(BlockQueue)*avg_block_size() > MEM_CACHE {
COUNTER("GDFU")
time.Sleep(100 * time.Millisecond)
return
}
var cnt int
b := new(bytes.Buffer)
vl := new(bytes.Buffer)
avs := avg_block_size()
blks_to_get := uint32(MEM_CACHE / avs)
max_cnt_to_get := (MAX_GET_FROM_PEER / avs) + 1
if max_cnt_to_get > MAX_BLOCKS_AT_ONCE {
max_cnt_to_get = MAX_BLOCKS_AT_ONCE
}
BlocksMutex.Lock()
FetchBlocksTo = BlocksComplete + blks_to_get
if FetchBlocksTo > LastBlockHeight {
FetchBlocksTo = LastBlockHeight
}
bl_stage := uint32(0)
for curblk := BlocksComplete; cnt < max_cnt_to_get; curblk++ {
if curblk > FetchBlocksTo {
if bl_stage == MAX_SAME_BLOCKS_AT_ONCE {
break
}
bl_stage++
curblk = BlocksComplete
}
if _, done := BlocksCached[curblk]; done {
continue
}
bh, ok := BlocksToGet[curblk]
if !ok {
continue
}
cbip := BlocksInProgress[bh]
if cbip == nil {
// if not in progress then we always take it
cbip = &one_bip{Height: curblk}
cbip.Conns = make(map[uint32]bool, MaxNetworkConns)
} else if cbip.Count != bl_stage || cbip.Conns[c.id] {
continue
}
if LastBlockAsked < curblk {
LastBlockAsked = curblk
}
cbip.Count = bl_stage + 1
cbip.Conns[c.id] = true
c.inprogress++
BlocksInProgress[bh] = cbip
b.Write([]byte{2, 0, 0, 0})
b.Write(bh[:])
cnt++
}
BlocksMutex.Unlock()
if cnt > 0 {
btc.WriteVlen(vl, uint64(cnt))
c.sendmsg("getdata", append(vl.Bytes(), b.Bytes()...))
COUNTER("GDYE")
} else {
COUNTER("GDNO")
time.Sleep(100 * time.Millisecond)
}
c.Lock()
c.last_blk_rcvd = time.Now()
c.Unlock()
}
func (c *OneConnection) ProcessGetData(pl []byte) {
var notfound []byte
//println(c.PeerAddr.Ip(), "getdata")
b := bytes.NewReader(pl)
cnt, e := btc.ReadVLen(b)
if e != nil {
println("ProcessGetData:", e.Error(), c.PeerAddr.Ip())
return
}
for i := 0; i < int(cnt); i++ {
var typ uint32
var h [36]byte
n, _ := b.Read(h[:])
if n != 36 {
println("ProcessGetData: pl too short", c.PeerAddr.Ip())
return
}
typ = binary.LittleEndian.Uint32(h[:4])
common.CountSafe(fmt.Sprint("GetdataType", typ))
if typ == 2 {
uh := btc.NewUint256(h[4:])
bl, _, er := common.BlockChain.Blocks.BlockGet(uh)
if er == nil {
c.SendRawMsg("block", bl)
} else {
notfound = append(notfound, h[:]...)
}
} else if typ == 1 {
// transaction
uh := btc.NewUint256(h[4:])
TxMutex.Lock()
if tx, ok := TransactionsToSend[uh.BIdx()]; ok && tx.Blocked == 0 {
tx.SentCnt++
tx.Lastsent = time.Now()
TxMutex.Unlock()
c.SendRawMsg("tx", tx.Data)
} else {
TxMutex.Unlock()
notfound = append(notfound, h[:]...)
}
} else {
if common.DebugLevel > 0 {
println("getdata for type", typ, "not supported yet")
}
if typ > 0 && typ <= 3 /*3 is a filtered block(we dont support it)*/ {
notfound = append(notfound, h[:]...)
}
}
}
if len(notfound) > 0 {
buf := new(bytes.Buffer)
btc.WriteVlen(buf, uint64(len(notfound)/36))
buf.Write(notfound)
c.SendRawMsg("notfound", buf.Bytes())
}
}