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BRPeerManager.c
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BRPeerManager.c
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//
// BRPeerManager.c
//
// Created by Aaron Voisine on 9/2/15.
// Copyright (c) 2015 breadwallet LLC.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "BRPeerManager.h"
#include "BRBloomFilter.h"
#include "BRSet.h"
#include "BRArray.h"
#include "BRInt.h"
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <limits.h>
#include <time.h>
#include <assert.h>
#include <pthread.h>
#include <errno.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define PROTOCOL_TIMEOUT 20.0
#define MAX_CONNECT_FAILURES 20 // notify user of network problems after this many connect failures in a row
#define PEER_FLAG_SYNCED 0x01
#define PEER_FLAG_NEEDSUPDATE 0x02
#define genesis_block_hash(params) UInt256Reverse((params)->checkpoints[0].hash)
#ifndef BITCOIN_TESTNET
#define BITCOIN_TESTNET 0
#endif
// Since many users experience data corruption issues on iOS, we
// implement the following procedure in order to prevent the issues.
// We will pass 0xAAAAAAAAAAAAAAAA to the native side (iOS/android), which will then check its value before saving the blocks.
// Important: stackIntegrityCheck_val is marked as volatile memory in order to prevent the compiler from optimizing this variable to a constant.
// Explanation: Assuming that the saveBlocks callback gets called successfully, the stack has to be valid in that very moment. So it's not the stack that's corrupted when calling the callback, but rather the allocated memory of the c-application. Perhaps iOS is killing the C part of the app first, shortly after that, it's killing the native side. Between these two, memory corruption can occur.
volatile uint64_t stackIntegrityCheck = 0xAAAAAAAAAAAAAAAA;
typedef struct {
BRPeerManager *manager;
const char *hostname;
uint64_t services;
} BRFindPeersInfo;
typedef struct {
BRPeer *peer;
BRPeerManager *manager;
UInt256 hash;
} BRPeerCallbackInfo;
typedef struct {
BRTransaction *tx;
void *info;
void (*callback)(void *info, int error);
} BRPublishedTx;
typedef struct {
UInt256 txHash;
BRPeer *peers;
} BRTxPeerList;
// true if peer is contained in the list of peers associated with txHash
static int _BRTxPeerListHasPeer(const BRTxPeerList *list, UInt256 txHash, const BRPeer *peer)
{
for (size_t i = array_count(list); i > 0; i--) {
if (! UInt256Eq(list[i - 1].txHash, txHash)) continue;
for (size_t j = array_count(list[i - 1].peers); j > 0; j--) {
if (BRPeerEq(&list[i - 1].peers[j - 1], peer)) return 1;
}
break;
}
return 0;
}
// number of peers associated with txHash
static size_t _BRTxPeerListCount(const BRTxPeerList *list, UInt256 txHash)
{
for (size_t i = array_count(list); i > 0; i--) {
if (UInt256Eq(list[i - 1].txHash, txHash)) return array_count(list[i - 1].peers);
}
return 0;
}
// adds peer to the list of peers associated with txHash and returns the new total number of peers
static size_t _BRTxPeerListAddPeer(BRTxPeerList **list, UInt256 txHash, const BRPeer *peer)
{
for (size_t i = array_count(*list); i > 0; i--) {
if (! UInt256Eq((*list)[i - 1].txHash, txHash)) continue;
for (size_t j = array_count((*list)[i - 1].peers); j > 0; j--) {
if (BRPeerEq(&(*list)[i - 1].peers[j - 1], peer)) return array_count((*list)[i - 1].peers);
}
array_add((*list)[i - 1].peers, *peer);
return array_count((*list)[i - 1].peers);
}
array_add(*list, ((BRTxPeerList) { txHash, NULL }));
array_new((*list)[array_count(*list) - 1].peers, PEER_MAX_CONNECTIONS);
array_add((*list)[array_count(*list) - 1].peers, *peer);
return 1;
}
// removes peer from the list of peers associated with txHash, returns true if peer was found
static int _BRTxPeerListRemovePeer(BRTxPeerList *list, UInt256 txHash, const BRPeer *peer)
{
for (size_t i = array_count(list); i > 0; i--) {
if (! UInt256Eq(list[i - 1].txHash, txHash)) continue;
for (size_t j = array_count(list[i - 1].peers); j > 0; j--) {
if (! BRPeerEq(&list[i - 1].peers[j - 1], peer)) continue;
array_rm(list[i - 1].peers, j - 1);
return 1;
}
break;
}
return 0;
}
// comparator for sorting peers by timestamp, most recent first
inline static int _peerTimestampCompare(const void *peer, const void *otherPeer)
{
if (((const BRPeer *)peer)->timestamp < ((const BRPeer *)otherPeer)->timestamp) return 1;
if (((const BRPeer *)peer)->timestamp > ((const BRPeer *)otherPeer)->timestamp) return -1;
return 0;
}
// returns a hash value for a block's prevBlock value suitable for use in a hashtable
inline static size_t _BRPrevBlockHash(const void *block)
{
return (size_t)((const BRMerkleBlock *)block)->prevBlock.u32[0];
}
// true if block and otherBlock have equal prevBlock values
inline static int _BRPrevBlockEq(const void *block, const void *otherBlock)
{
return UInt256Eq(((const BRMerkleBlock *)block)->prevBlock, ((const BRMerkleBlock *)otherBlock)->prevBlock);
}
// returns a hash value for a block's height value suitable for use in a hashtable
inline static size_t _BRBlockHeightHash(const void *block)
{
// (FNV_OFFSET xor height)*FNV_PRIME
return (size_t)((0x811C9dc5 ^ ((const BRMerkleBlock *)block)->height)*0x01000193);
}
// true if block and otherBlock have equal height values
inline static int _BRBlockHeightEq(const void *block, const void *otherBlock)
{
return (((const BRMerkleBlock *)block)->height == ((const BRMerkleBlock *)otherBlock)->height);
}
struct BRPeerManagerStruct {
const BRChainParams *params;
BRWallet *wallet;
int isConnected, connectFailureCount, misbehavinCount, dnsThreadCount, maxConnectCount, peerThreadCount;
BRPeer *peers, *downloadPeer, fixedPeer, **connectedPeers;
char downloadPeerName[INET6_ADDRSTRLEN + 6];
uint32_t earliestKeyTime, syncStartHeight, filterUpdateHeight, estimatedHeight;
BRBloomFilter *bloomFilter;
double fpRate, averageTxPerBlock;
BRSet *blocks, *orphans, *checkpoints;
BRMerkleBlock *lastBlock, *lastOrphan;
BRMerkleBlock *startSyncFrom;
BRTxPeerList *txRelays, *txRequests;
BRPublishedTx *publishedTx;
UInt256 *publishedTxHashes;
void *info;
void (*syncStarted)(void *info);
void (*syncStopped)(void *info, int error);
void (*txStatusUpdate)(void *info);
void (*saveBlocks)(void *info, int replace, BRMerkleBlock *blocks[], size_t blocksCount, uint64_t* stackIntegrityCheck);
void (*savePeers)(void *info, int replace, const BRPeer peers[], size_t peersCount);
int (*networkIsReachable)(void *info);
void (*threadCleanup)(void *info);
pthread_mutex_t lock;
};
void BRPeerManagerSetStartBlock(BRPeerManager* manager, BRMerkleBlock* start) {
if (!manager || !start) return;
manager->startSyncFrom = start;
}
static void _BRPeerManagerPeerMisbehavin(BRPeerManager *manager, BRPeer *peer)
{
for (size_t i = array_count(manager->peers); i > 0; i--) {
if (BRPeerEq(&manager->peers[i - 1], peer)) array_rm(manager->peers, i - 1);
}
if (++manager->misbehavinCount >= 10) { // clear out stored peers so we get a fresh list from DNS for next connect
manager->misbehavinCount = 0;
array_clear(manager->peers);
}
BRPeerDisconnect(peer);
}
static void _BRPeerManagerSyncStopped(BRPeerManager *manager)
{
manager->syncStartHeight = 0;
if (manager->downloadPeer) {
// don't cancel timeout if there's a pending tx publish callback
for (size_t i = array_count(manager->publishedTx); i > 0; i--) {
if (manager->publishedTx[i - 1].callback != NULL) return;
}
BRPeerScheduleDisconnect(manager->downloadPeer, -1); // cancel sync timeout
}
}
// adds transaction to list of tx to be published, along with any unconfirmed inputs
static void _BRPeerManagerAddTxToPublishList(BRPeerManager *manager, BRTransaction *tx, void *info,
void (*callback)(void *, int))
{
if (tx && tx->blockHeight == TX_UNCONFIRMED) {
for (size_t i = array_count(manager->publishedTx); i > 0; i--) {
if (BRTransactionEq(manager->publishedTx[i - 1].tx, tx)) return;
}
array_add(manager->publishedTx, ((BRPublishedTx) { tx, info, callback }));
array_add(manager->publishedTxHashes, tx->txHash);
for (size_t i = 0; i < tx->inCount; i++) {
_BRPeerManagerAddTxToPublishList(manager, BRWalletTransactionForHash(manager->wallet, tx->inputs[i].txHash),
NULL, NULL);
}
}
}
static size_t _BRPeerManagerBlockLocators(BRPeerManager *manager, UInt256 locators[], size_t locatorsCount)
{
// append 10 most recent block hashes, decending, then continue appending, doubling the step back each time,
// finishing with the genesis block (top, -1, -2, -3, -4, -5, -6, -7, -8, -9, -11, -15, -23, -39, -71, -135, ..., 0)
BRMerkleBlock *block = manager->lastBlock;
int32_t step = 1, i = 0, j;
while (block && block->height > 0) {
if (locators && i < locatorsCount) locators[i] = block->blockHash;
if (++i >= 10) step *= 2;
for (j = 0; block && j < step; j++) {
block = BRSetGet(manager->blocks, &block->prevBlock);
}
}
if (locators && i < locatorsCount) locators[i] = genesis_block_hash(manager->params);
return ++i;
}
static void _setApplyFreeBlock(void *info, void *block)
{
BRMerkleBlockFree(block);
}
static size_t _BRPeerManagerAddPeer(BRPeerManager *manager, BRPeer *peer) {
size_t add = 1;
for (size_t i = array_count(manager->peers); i > 0; i--) {
BRPeer* otherPeer = (BRPeer*) &(manager->peers[i - 1]);
if (BRPeerEq(otherPeer, peer)) { i = 1; add = 0;}
}
if (add == 1) array_add(manager->peers, *peer);
return add;
}
static void _BRPeerManagerLoadBloomFilter(BRPeerManager *manager, BRPeer *peer)
{
// every time a new wallet address is added, the bloom filter has to be rebuilt, and each address is only used
// for one transaction, so here we generate some spare addresses to avoid rebuilding the filter each time a
// wallet transaction is encountered during the chain sync
BRWalletUnusedAddrs(manager->wallet, NULL, SEQUENCE_GAP_LIMIT_EXTERNAL + 100, 0, 1);
BRWalletUnusedAddrs(manager->wallet, NULL, SEQUENCE_GAP_LIMIT_INTERNAL + 100, 1, 1);
BRWalletUnusedAddrs(manager->wallet, NULL, SEQUENCE_GAP_LIMIT_EXTERNAL + 100, 0, 0);
BRWalletUnusedAddrs(manager->wallet, NULL, SEQUENCE_GAP_LIMIT_INTERNAL + 100, 1, 0);
BRSetApply(manager->orphans, NULL, _setApplyFreeBlock);
BRSetClear(manager->orphans); // clear out orphans that may have been received on an old filter
manager->lastOrphan = NULL;
manager->filterUpdateHeight = manager->lastBlock->height;
manager->fpRate = BLOOM_REDUCED_FALSEPOSITIVE_RATE;
size_t addrsCount = BRWalletAllAddrs(manager->wallet, NULL, 0);
BRAddress *addrs = malloc(addrsCount * sizeof(*addrs));
size_t utxosCount = BRWalletUTXOs(manager->wallet, NULL, 0);
BRUTXO *utxos = malloc(utxosCount * sizeof(*utxos));
uint32_t blockHeight = (manager->lastBlock->height > 100) ? manager->lastBlock->height - 100 : 0;
size_t txCount = BRWalletTxUnconfirmedBefore(manager->wallet, NULL, 0, blockHeight);
BRTransaction **transactions = malloc(txCount*sizeof(*transactions));
BRBloomFilter *filter;
assert(addrs != NULL);
assert(utxos != NULL);
assert(transactions != NULL);
addrsCount = BRWalletAllAddrs(manager->wallet, addrs, addrsCount);
utxosCount = BRWalletUTXOs(manager->wallet, utxos, utxosCount);
txCount = BRWalletTxUnconfirmedBefore(manager->wallet, transactions, txCount, blockHeight);
filter = BRBloomFilterNew(manager->fpRate, addrsCount + utxosCount + txCount + 100, (uint32_t) BRPeerHash(peer),
BLOOM_UPDATE_ALL); // BUG: XXX txCount not the same as number of spent wallet outputs
for (size_t i = 0; i < addrsCount; i++) { // add addresses to watch for tx receiving money to the wallet
UInt160 hash = UINT160_ZERO;
BRAddressHash160(&hash, addrs[i].s);
if (! UInt160IsZero(hash) && ! BRBloomFilterContainsData(filter, hash.u8, sizeof(hash))) {
BRBloomFilterInsertData(filter, hash.u8, sizeof(hash));
}
}
free(addrs);
for (size_t i = 0; i < utxosCount; i++) { // add UTXOs to watch for tx sending money from the wallet
uint8_t o[sizeof(UInt256) + sizeof(uint32_t)];
UInt256Set(o, utxos[i].hash);
UInt32SetLE(&o[sizeof(UInt256)], utxos[i].n);
if (! BRBloomFilterContainsData(filter, o, sizeof(o))) BRBloomFilterInsertData(filter, o, sizeof(o));
}
free(utxos);
for (size_t i = 0; i < txCount; i++) { // also add TXOs spent within the last 100 blocks
for (size_t j = 0; j < transactions[i]->inCount; j++) {
BRTxInput *input = &transactions[i]->inputs[j];
BRTransaction *tx = BRWalletTransactionForHash(manager->wallet, input->txHash);
uint8_t o[sizeof(UInt256) + sizeof(uint32_t)];
if (tx && input->index < tx->outCount &&
BRWalletContainsAddress(manager->wallet, tx->outputs[input->index].address)) {
UInt256Set(o, input->txHash);
UInt32SetLE(&o[sizeof(UInt256)], input->index);
if (! BRBloomFilterContainsData(filter, o, sizeof(o))) BRBloomFilterInsertData(filter, o,sizeof(o));
}
}
}
free(transactions);
if (manager->bloomFilter) BRBloomFilterFree(manager->bloomFilter);
manager->bloomFilter = filter;
// TODO: XXX if already synced, recursively add inputs of unconfirmed receives
uint8_t data[BRBloomFilterSerialize(filter, NULL, 0)];
size_t len = BRBloomFilterSerialize(filter, data, sizeof(data));
BRPeerSendFilterload(peer, data, len);
}
static void _updateFilterRerequestDone(void *info, int success)
{
BRPeer *peer = ((BRPeerCallbackInfo *)info)->peer;
BRPeerManager *manager = ((BRPeerCallbackInfo *)info)->manager;
free(info);
if (success) {
pthread_mutex_lock(&manager->lock);
if ((peer->flags & PEER_FLAG_NEEDSUPDATE) == 0) {
UInt256 locators[_BRPeerManagerBlockLocators(manager, NULL, 0)];
size_t count = _BRPeerManagerBlockLocators(manager, locators, sizeof(locators)/sizeof(*locators));
BRPeerSendGetblocks(peer, locators, count, UINT256_ZERO);
}
pthread_mutex_unlock(&manager->lock);
}
}
static void _updateFilterLoadDone(void *info, int success)
{
BRPeer *peer = ((BRPeerCallbackInfo *)info)->peer;
BRPeerManager *manager = ((BRPeerCallbackInfo *)info)->manager;
BRPeerCallbackInfo *peerInfo;
free(info);
if (success) {
pthread_mutex_lock(&manager->lock);
BRPeerSetNeedsFilterUpdate(peer, 0);
peer->flags &= ~PEER_FLAG_NEEDSUPDATE;
if (manager->lastBlock->height < manager->estimatedHeight) { // if syncing, rerequest blocks
peerInfo = calloc(1, sizeof(*peerInfo));
assert(peerInfo != NULL);
peerInfo->peer = peer;
peerInfo->manager = manager;
BRPeerRerequestBlocks(manager->downloadPeer, manager->lastBlock->blockHash);
BRPeerSendPing(manager->downloadPeer, peerInfo, _updateFilterRerequestDone);
}
else BRPeerSendMempool(peer, NULL, 0, NULL, NULL); // if not syncing, request mempool
pthread_mutex_unlock(&manager->lock);
}
}
static void _updateFilterPingDone(void *info, int success)
{
BRPeer *peer = ((BRPeerCallbackInfo *)info)->peer;
BRPeerManager *manager = ((BRPeerCallbackInfo *)info)->manager;
BRPeerCallbackInfo *peerInfo;
if (success) {
pthread_mutex_lock(&manager->lock);
peer_log(peer, "updating filter with newly created wallet addresses");
if (manager->bloomFilter) BRBloomFilterFree(manager->bloomFilter);
manager->bloomFilter = NULL;
if (manager->lastBlock->height < manager->estimatedHeight) { // if we're syncing, only update download peer
if (manager->downloadPeer) {
_BRPeerManagerLoadBloomFilter(manager, manager->downloadPeer);
BRPeerSendPing(manager->downloadPeer, info, _updateFilterLoadDone); // wait for pong so filter is loaded
}
else free(info);
}
else {
free(info);
for (size_t i = array_count(manager->connectedPeers); i > 0; i--) {
if (BRPeerConnectStatus(manager->connectedPeers[i - 1]) != BRPeerStatusConnected) continue;
peerInfo = calloc(1, sizeof(*peerInfo));
assert(peerInfo != NULL);
peerInfo->peer = manager->connectedPeers[i - 1];
peerInfo->manager = manager;
_BRPeerManagerLoadBloomFilter(manager, peerInfo->peer);
BRPeerSendPing(peerInfo->peer, peerInfo, _updateFilterLoadDone); // wait for pong so filter is loaded
}
}
pthread_mutex_unlock(&manager->lock);
}
else free(info);
}
static void _BRPeerManagerUpdateFilter(BRPeerManager *manager)
{
BRPeerCallbackInfo *info;
if (manager->downloadPeer && (manager->downloadPeer->flags & PEER_FLAG_NEEDSUPDATE) == 0) {
BRPeerSetNeedsFilterUpdate(manager->downloadPeer, 1);
manager->downloadPeer->flags |= PEER_FLAG_NEEDSUPDATE;
peer_log(manager->downloadPeer, "filter update needed, waiting for pong");
info = calloc(1, sizeof(*info));
assert(info != NULL);
info->peer = manager->downloadPeer;
info->manager = manager;
// wait for pong so we're sure to include any tx already sent by the peer in the updated filter
BRPeerSendPing(manager->downloadPeer, info, _updateFilterPingDone);
}
}
static void _BRPeerManagerUpdateTx(BRPeerManager *manager, const UInt256 txHashes[], size_t txCount,
uint32_t blockHeight, uint32_t timestamp)
{
if (blockHeight != TX_UNCONFIRMED) { // remove confirmed tx from publish list and relay counts
for (size_t i = 0; i < txCount; i++) {
for (size_t j = array_count(manager->publishedTx); j > 0; j--) {
BRTransaction *tx = manager->publishedTx[j - 1].tx;
if (! UInt256Eq(txHashes[i], tx->txHash)) continue;
array_rm(manager->publishedTx, j - 1);
array_rm(manager->publishedTxHashes, j - 1);
if (! BRWalletTransactionForHash(manager->wallet, tx->txHash)) BRTransactionFree(tx);
}
for (size_t j = array_count(manager->txRelays); j > 0; j--) {
if (! UInt256Eq(txHashes[i], manager->txRelays[j - 1].txHash)) continue;
array_free(manager->txRelays[j - 1].peers);
array_rm(manager->txRelays, j - 1);
}
}
}
BRWalletUpdateTransactions(manager->wallet, txHashes, txCount, blockHeight, timestamp);
}
// unconfirmed transactions that aren't in the mempools of any of connected peers have likely dropped off the network
static void _requestUnrelayedTxGetdataDone(void *info, int success)
{
BRPeer *peer = ((BRPeerCallbackInfo *)info)->peer;
BRPeerManager *manager = ((BRPeerCallbackInfo *)info)->manager;
int isPublishing;
size_t count = 0;
free(info);
pthread_mutex_lock(&manager->lock);
if (success) peer->flags |= PEER_FLAG_SYNCED;
for (size_t i = array_count(manager->connectedPeers); i > 0; i--) {
peer = manager->connectedPeers[i - 1];
if (BRPeerConnectStatus(peer) == BRPeerStatusConnected) count++;
if ((peer->flags & PEER_FLAG_SYNCED) != 0) continue;
count = 0;
break;
}
// don't remove transactions until we're connected to maxConnectCount peers, and all peers have finished
// relaying their mempools
if (count >= manager->maxConnectCount) {
size_t txCount = BRWalletTxUnconfirmedBefore(manager->wallet, NULL, 0, TX_UNCONFIRMED);
BRTransaction *tx[(txCount < 10000) ? txCount : 10000];
txCount = BRWalletTxUnconfirmedBefore(manager->wallet, tx, sizeof(tx)/sizeof(*tx), TX_UNCONFIRMED);
for (size_t i = 0; i < txCount; i++) {
isPublishing = 0;
for (size_t j = array_count(manager->publishedTx); ! isPublishing && j > 0; j--) {
if (BRTransactionEq(manager->publishedTx[j - 1].tx, tx[i]) &&
manager->publishedTx[j - 1].callback != NULL) isPublishing = 1;
}
if (! isPublishing && _BRTxPeerListCount(manager->txRelays, tx[i]->txHash) == 0 &&
_BRTxPeerListCount(manager->txRequests, tx[i]->txHash) == 0) {
BRWalletRemoveTransaction(manager->wallet, tx[i]->txHash);
}
else if (! isPublishing && _BRTxPeerListCount(manager->txRelays, tx[i]->txHash) < manager->maxConnectCount){
// set timestamp 0 to mark as unverified
_BRPeerManagerUpdateTx(manager, &tx[i]->txHash, 1, TX_UNCONFIRMED, 0);
}
}
}
pthread_mutex_unlock(&manager->lock);
}
static void _BRPeerManagerRequestUnrelayedTx(BRPeerManager *manager, BRPeer *peer)
{
BRPeerCallbackInfo *info;
size_t hashCount = 0, txCount = BRWalletTxUnconfirmedBefore(manager->wallet, NULL, 0, TX_UNCONFIRMED);
BRTransaction *tx[txCount];
UInt256 txHashes[txCount];
txCount = BRWalletTxUnconfirmedBefore(manager->wallet, tx, txCount, TX_UNCONFIRMED);
for (size_t i = 0; i < txCount; i++) {
if (! _BRTxPeerListHasPeer(manager->txRelays, tx[i]->txHash, peer) &&
! _BRTxPeerListHasPeer(manager->txRequests, tx[i]->txHash, peer)) {
txHashes[hashCount++] = tx[i]->txHash;
_BRTxPeerListAddPeer(&manager->txRequests, tx[i]->txHash, peer);
}
}
if (hashCount > 0) {
BRPeerSendGetdata(peer, txHashes, hashCount, NULL, 0);
if ((peer->flags & PEER_FLAG_SYNCED) == 0) {
info = calloc(1, sizeof(*info));
assert(info != NULL);
info->peer = peer;
info->manager = manager;
BRPeerSendPing(peer, info, _requestUnrelayedTxGetdataDone);
}
}
else peer->flags |= PEER_FLAG_SYNCED;
}
static void _BRPeerManagerPublishPendingTx(BRPeerManager *manager, BRPeer *peer)
{
for (size_t i = array_count(manager->publishedTx); i > 0; i--) {
if (manager->publishedTx[i - 1].callback == NULL) continue;
BRPeerScheduleDisconnect(peer, PROTOCOL_TIMEOUT); // schedule publish timeout
break;
}
BRPeerSendInv(peer, manager->publishedTxHashes, array_count(manager->publishedTxHashes));
}
static void _mempoolDone(void *info, int success)
{
BRPeer *peer = ((BRPeerCallbackInfo *)info)->peer;
BRPeerManager *manager = ((BRPeerCallbackInfo *)info)->manager;
int syncFinished = 0;
free(info);
if (success) {
peer_log(peer, "mempool request finished");
pthread_mutex_lock(&manager->lock);
if (manager->syncStartHeight > 0) {
peer_log(peer, "sync succeeded");
syncFinished = 1;
_BRPeerManagerSyncStopped(manager);
}
_BRPeerManagerRequestUnrelayedTx(manager, peer);
BRPeerSendGetaddr(peer); // request a list of other bitcoin peers
pthread_mutex_unlock(&manager->lock);
if (manager->txStatusUpdate) manager->txStatusUpdate(manager->info);
if (syncFinished && manager->syncStopped) manager->syncStopped(manager->info, 0);
}
else peer_log(peer, "mempool request failed");
}
static void _loadBloomFilterDone(void *info, int success)
{
BRPeer *peer = ((BRPeerCallbackInfo *)info)->peer;
BRPeerManager *manager = ((BRPeerCallbackInfo *)info)->manager;
pthread_mutex_lock(&manager->lock);
if (success) {
BRPeerSendMempool(peer, manager->publishedTxHashes, array_count(manager->publishedTxHashes), info,
_mempoolDone);
pthread_mutex_unlock(&manager->lock);
}
else {
free(info);
if (peer == manager->downloadPeer) {
peer_log(peer, "sync succeeded");
_BRPeerManagerSyncStopped(manager);
pthread_mutex_unlock(&manager->lock);
if (manager->syncStopped) manager->syncStopped(manager->info, 0);
}
else pthread_mutex_unlock(&manager->lock);
}
}
static void _BRPeerManagerLoadMempools(BRPeerManager *manager)
{
// after syncing, load filters and get mempools from other peers
for (size_t i = array_count(manager->connectedPeers); i > 0; i--) {
BRPeer *peer = manager->connectedPeers[i - 1];
BRPeerCallbackInfo *info;
if (BRPeerConnectStatus(peer) != BRPeerStatusConnected) continue;
info = calloc(1, sizeof(*info));
assert(info != NULL);
info->peer = peer;
info->manager = manager;
if (peer != manager->downloadPeer || manager->fpRate > BLOOM_REDUCED_FALSEPOSITIVE_RATE*5.0) {
_BRPeerManagerLoadBloomFilter(manager, peer);
_BRPeerManagerPublishPendingTx(manager, peer);
BRPeerSendPing(peer, info, _loadBloomFilterDone); // load mempool after updating bloomfilter
}
else BRPeerSendMempool(peer, manager->publishedTxHashes, array_count(manager->publishedTxHashes), info,
_mempoolDone);
}
}
// returns a UINT128_ZERO terminated array of addresses for hostname that must be freed, or NULL if lookup failed
static UInt128 *_addressLookup(const char *hostname)
{
struct addrinfo *servinfo, *p;
UInt128 *addrList = NULL;
size_t count = 0, i = 0;
if (getaddrinfo(hostname, NULL, NULL, &servinfo) == 0) {
for (p = servinfo; p != NULL; p = p->ai_next) count++;
if (count > 0) addrList = calloc(count + 1, sizeof(*addrList));
assert(addrList != NULL || count == 0);
for (p = servinfo; p != NULL; p = p->ai_next) {
if (p->ai_family == AF_INET) {
addrList[i].u16[5] = 0xffff;
addrList[i].u32[3] = ((struct sockaddr_in *)p->ai_addr)->sin_addr.s_addr;
i++;
}
else if (p->ai_family == AF_INET6) {
addrList[i++] = *(UInt128 *)&((struct sockaddr_in6 *)p->ai_addr)->sin6_addr;
}
}
freeaddrinfo(servinfo);
}
return addrList;
}
static void *_findPeersThreadRoutine(void *arg)
{
BRPeerManager *manager = ((BRFindPeersInfo *)arg)->manager;
uint64_t services = ((BRFindPeersInfo *)arg)->services;
UInt128 *addrList, *addr;
time_t now = time(NULL), age;
pthread_cleanup_push(manager->threadCleanup, manager->info);
addrList = _addressLookup(((BRFindPeersInfo *)arg)->hostname);
free(arg);
pthread_mutex_lock(&manager->lock);
for (addr = addrList; addr && ! UInt128IsZero(*addr); addr++) {
age = 24*60*60 + BRRand(2*24*60*60); // add between 1 and 3 days
BRPeer peer = {*addr, manager->params->standardPort, services, now - age, 0};
_BRPeerManagerAddPeer(manager,&peer);
}
manager->dnsThreadCount--;
pthread_mutex_unlock(&manager->lock);
if (addrList) free(addrList);
pthread_cleanup_pop(1);
return NULL;
}
// DNS peer discovery
static void _BRPeerManagerFindPeers(BRPeerManager *manager)
{
uint64_t services = SERVICES_NODE_NETWORK | SERVICES_NODE_BLOOM | manager->params->services;
time_t now = time(NULL);
struct timespec ts;
pthread_t thread;
pthread_attr_t attr;
UInt128 *addr, *addrList;
BRFindPeersInfo *info;
if (! UInt128IsZero(manager->fixedPeer.address)) {
array_set_count(manager->peers, 1);
manager->peers[0] = manager->fixedPeer;
manager->peers[0].services = services;
manager->peers[0].timestamp = now;
}
else {
for (size_t i = 1; manager->params->dnsSeeds[i]; i++) {
info = calloc(1, sizeof(BRFindPeersInfo));
assert(info != NULL);
info->manager = manager;
info->hostname = manager->params->dnsSeeds[i];
info->services = services;
if (pthread_attr_init(&attr) == 0 && pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0 &&
pthread_create(&thread, &attr, _findPeersThreadRoutine, info) == 0) manager->dnsThreadCount++;
}
for (addr = addrList = _addressLookup(manager->params->dnsSeeds[0]); addr && ! UInt128IsZero(*addr); addr++) {
BRPeer peer = {*addr, manager->params->standardPort, services, now, 0};
_BRPeerManagerAddPeer(manager,&peer);
}
if (addrList) free(addrList);
ts.tv_sec = 0;
ts.tv_nsec = 1;
do {
pthread_mutex_unlock(&manager->lock);
nanosleep(&ts, NULL); // pthread_yield() isn't POSIX standard :(
pthread_mutex_lock(&manager->lock);
} while (manager->dnsThreadCount > 0 && array_count(manager->peers) < PEER_MAX_CONNECTIONS);
qsort(manager->peers, array_count(manager->peers), sizeof(*manager->peers), _peerTimestampCompare);
}
}
static void _peerConnected(void *info)
{
BRPeer *peer = ((BRPeerCallbackInfo *)info)->peer;
BRPeerManager *manager = ((BRPeerCallbackInfo *)info)->manager;
BRPeerCallbackInfo *peerInfo;
time_t now = time(NULL);
pthread_mutex_lock(&manager->lock);
if (peer->timestamp > now + 2*60*60 || peer->timestamp < now - 2*60*60) peer->timestamp = now; // sanity check
// TODO: XXX does this work with 0.11 pruned nodes?
if ((peer->services & manager->params->services) != manager->params->services) {
peer_log(peer, "unsupported node type");
BRPeerDisconnect(peer);
}
else if ((peer->services & SERVICES_NODE_NETWORK) != SERVICES_NODE_NETWORK) {
peer_log(peer, "node doesn't carry full blocks");
BRPeerDisconnect(peer);
}
else if (BRPeerLastBlock(peer) + 10 < manager->lastBlock->height) {
peer_log(peer, "node isn't synced");
BRPeerDisconnect(peer);
}
else if (BRPeerVersion(peer) >= 70011 && (peer->services & SERVICES_NODE_BLOOM) != SERVICES_NODE_BLOOM) {
peer_log(peer, "node doesn't support SPV mode");
BRPeerDisconnect(peer);
}
else if (manager->downloadPeer && // check if we should stick with the existing download peer
(BRPeerLastBlock(manager->downloadPeer) >= BRPeerLastBlock(peer) ||
manager->lastBlock->height >= BRPeerLastBlock(peer))) {
if (manager->lastBlock->height >= BRPeerLastBlock(peer)) { // only load bloom filter if we're done syncing
manager->connectFailureCount = 0; // also reset connect failure count if we're already synced
_BRPeerManagerLoadBloomFilter(manager, peer);
_BRPeerManagerPublishPendingTx(manager, peer);
peerInfo = calloc(1, sizeof(*peerInfo));
assert(peerInfo != NULL);
peerInfo->peer = peer;
peerInfo->manager = manager;
BRPeerSendPing(peer, peerInfo, _loadBloomFilterDone);
}
}
else { // select the peer with the lowest ping time to download the chain from if we're behind
// BUG: XXX a malicious peer can report a higher lastblock to make us select them as the download peer, if
// two peers agree on lastblock, use one of those two instead
for (size_t i = array_count(manager->connectedPeers); i > 0; i--) {
BRPeer *p = manager->connectedPeers[i - 1];
if (BRPeerConnectStatus(p) != BRPeerStatusConnected) continue;
if ((BRPeerPingTime(p) < BRPeerPingTime(peer) && BRPeerLastBlock(p) >= BRPeerLastBlock(peer)) ||
BRPeerLastBlock(p) > BRPeerLastBlock(peer)) peer = p;
}
if (manager->downloadPeer) BRPeerDisconnect(manager->downloadPeer);
manager->downloadPeer = peer;
manager->isConnected = 1;
manager->estimatedHeight = BRPeerLastBlock(peer);
_BRPeerManagerLoadBloomFilter(manager, peer);
BRPeerSetCurrentBlockHeight(peer, manager->lastBlock->height);
_BRPeerManagerPublishPendingTx(manager, peer);
if (manager->lastBlock->height < BRPeerLastBlock(peer)) { // start blockchain sync
UInt256 locators[_BRPeerManagerBlockLocators(manager, NULL, 0)];
size_t count = _BRPeerManagerBlockLocators(manager, locators, sizeof(locators)/sizeof(*locators));
BRPeerScheduleDisconnect(peer, PROTOCOL_TIMEOUT); // schedule sync timeout
// request just block headers up to a week before earliestKeyTime, and then merkleblocks after that
// we do not reset connect failure count yet incase this request times out
if (manager->lastBlock->timestamp + 7*24*60*60 >= manager->earliestKeyTime) {
BRPeerSendGetblocks(peer, locators, count, UINT256_ZERO);
}
else BRPeerSendGetheaders(peer, locators, count, UINT256_ZERO);
}
else { // we're already synced
manager->connectFailureCount = 0; // reset connect failure count
_BRPeerManagerLoadMempools(manager);
}
}
pthread_mutex_unlock(&manager->lock);
}
static void _peerDisconnected(void *info, int error)
{
BRPeer *peer = ((BRPeerCallbackInfo *)info)->peer;
BRPeerManager *manager = ((BRPeerCallbackInfo *)info)->manager;
BRTxPeerList *peerList;
int willSave = 0, willReconnect = 0, txError = 0;
size_t txCount = 0;
//free(info);
pthread_mutex_lock(&manager->lock);
void *txInfo[array_count(manager->publishedTx)];
void (*txCallback[array_count(manager->publishedTx)])(void *, int);
if (error == EPROTO) { // if it's protocol error, the peer isn't following standard policy
_BRPeerManagerPeerMisbehavin(manager, peer);
}
else if (error) { // timeout or some non-protocol related network error
for (size_t i = array_count(manager->peers); i > 0; i--) {
if (BRPeerEq(&manager->peers[i - 1], peer)) array_rm(manager->peers, i - 1);
}
manager->connectFailureCount++;
// if it's a timeout and there's pending tx publish callbacks, the tx publish timed out
// BUG: XXX what if it's a connect timeout and not a publish timeout?
if (error == ETIMEDOUT && (peer != manager->downloadPeer || manager->syncStartHeight == 0 ||
array_count(manager->connectedPeers) == 1)) txError = ETIMEDOUT;
}
for (size_t i = array_count(manager->txRelays); i > 0; i--) {
peerList = &manager->txRelays[i - 1];
for (size_t j = array_count(peerList->peers); j > 0; j--) {
if (BRPeerEq(&peerList->peers[j - 1], peer)) array_rm(peerList->peers, j - 1);
}
}
if (peer == manager->downloadPeer) { // download peer disconnected
manager->isConnected = 0;
manager->downloadPeer = NULL;
if (manager->connectFailureCount > MAX_CONNECT_FAILURES) manager->connectFailureCount = MAX_CONNECT_FAILURES;
}
if (! manager->isConnected && manager->connectFailureCount == MAX_CONNECT_FAILURES) {
_BRPeerManagerSyncStopped(manager);
// clear out stored peers so we get a fresh list from DNS on next connect attempt
array_clear(manager->peers);
txError = ENOTCONN; // trigger any pending tx publish callbacks
willSave = 1;
peer_log(peer, "sync failed");
}
else if (manager->connectFailureCount < MAX_CONNECT_FAILURES) willReconnect = 1;
if (txError) {
for (size_t i = array_count(manager->publishedTx); i > 0; i--) {
if (manager->publishedTx[i - 1].callback == NULL) continue;
peer_log(peer, "transaction canceled: %s", strerror(txError));
txInfo[txCount] = manager->publishedTx[i - 1].info;
txCallback[txCount] = manager->publishedTx[i - 1].callback;
txCount++;
BRTransactionFree(manager->publishedTx[i - 1].tx);
array_rm(manager->publishedTxHashes, i - 1);
array_rm(manager->publishedTx, i - 1);
}
}
for (size_t i = array_count(manager->connectedPeers); i > 0; i--) {
if (manager->connectedPeers[i - 1] != peer) continue;
array_rm(manager->connectedPeers, i - 1);
break;
}
BRPeerFree(peer);
pthread_mutex_unlock(&manager->lock);
for (size_t i = 0; i < txCount; i++) {
txCallback[i](txInfo[i], txError);
}
if (willSave && manager->savePeers) manager->savePeers(manager->info, 1, NULL, 0);
if (willSave && manager->syncStopped) manager->syncStopped(manager->info, error);
if (willReconnect) BRPeerManagerConnect(manager); // try connecting to another peer
if (manager->txStatusUpdate) manager->txStatusUpdate(manager->info);
}
static void _peerRelayedPeers(void *info, const BRPeer peers[], size_t peersCount)
{
BRPeer *peer = ((BRPeerCallbackInfo *)info)->peer;
BRPeerManager *manager = ((BRPeerCallbackInfo *)info)->manager;
time_t now = time(NULL);
pthread_mutex_lock(&manager->lock);
peer_log(peer, "relayed %zu peer(s)", peersCount);
array_add_array(manager->peers, peers, peersCount);
qsort(manager->peers, array_count(manager->peers), sizeof(*manager->peers), _peerTimestampCompare);
// limit total to 2500 peers
if (array_count(manager->peers) > 2500) array_set_count(manager->peers, 2500);
peersCount = array_count(manager->peers);
// remove peers more than 3 hours old, or until there are only 1000 left
while (peersCount > 1000 && manager->peers[peersCount - 1].timestamp + 3*60*60 < now) peersCount--;
array_set_count(manager->peers, peersCount);
BRPeer save[peersCount];
for (size_t i = 0; i < peersCount; i++) save[i] = manager->peers[i];
pthread_mutex_unlock(&manager->lock);
// peer relaying is complete when we receive <1000
if (peersCount > 1 && peersCount < 1000 &&
manager->savePeers) manager->savePeers(manager->info, 1, save, peersCount);
}
static void _peerRelayedTx(void *info, BRTransaction *tx)
{
BRPeer *peer = ((BRPeerCallbackInfo *)info)->peer;
BRPeerManager *manager = ((BRPeerCallbackInfo *)info)->manager;
void *txInfo = NULL;
void (*txCallback)(void *, int) = NULL;
int isWalletTx = 0, hasPendingCallbacks = 0;
size_t relayCount = 0;
pthread_mutex_lock(&manager->lock);
peer_log(peer, "relayed tx: %s", u256hex(tx->txHash));
for (size_t i = array_count(manager->publishedTx); i > 0; i--) { // see if tx is in list of published tx
if (UInt256Eq(manager->publishedTxHashes[i - 1], tx->txHash)) {
txInfo = manager->publishedTx[i - 1].info;
txCallback = manager->publishedTx[i - 1].callback;
manager->publishedTx[i - 1].info = NULL;
manager->publishedTx[i - 1].callback = NULL;
relayCount = _BRTxPeerListAddPeer(&manager->txRelays, tx->txHash, peer);
}
else if (manager->publishedTx[i - 1].callback != NULL) hasPendingCallbacks = 1;
}
// cancel tx publish timeout if no publish callbacks are pending, and syncing is done or this is not downloadPeer
if (! hasPendingCallbacks && (manager->syncStartHeight == 0 || peer != manager->downloadPeer)) {
BRPeerScheduleDisconnect(peer, -1); // cancel publish tx timeout
}
if (manager->syncStartHeight == 0 || BRWalletContainsTransaction(manager->wallet, tx)) {
isWalletTx = BRWalletRegisterTransaction(manager->wallet, tx);
if (isWalletTx) tx = BRWalletTransactionForHash(manager->wallet, tx->txHash);
}