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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)
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;
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;
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);
void (*savePeers)(void *info, int replace, const BRPeer peers[], size_t peersCount);
int (*networkIsReachable)(void *info);
void (*threadCleanup)(void *info);
pthread_mutex_t lock;
};
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 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);
BRWalletUnusedAddrs(manager->wallet, NULL, SEQUENCE_GAP_LIMIT_INTERNAL + 100, 1);
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 receiveing 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);
}
}
// 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) {
UInt256 hash;
size_t txCount = BRWalletTxUnconfirmedBefore(manager->wallet, NULL, 0, TX_UNCONFIRMED);
BRTransaction *tx[(txCount*sizeof(BRTransaction *) <= 0x1000) ? txCount : 0x1000/sizeof(BRTransaction *)];
txCount = BRWalletTxUnconfirmedBefore(manager->wallet, tx, sizeof(tx)/sizeof(*tx), TX_UNCONFIRMED);
for (size_t i = txCount; i > 0; i--) {
hash = tx[i - 1]->txHash;
isPublishing = 0;
for (size_t j = array_count(manager->publishedTx); ! isPublishing && j > 0; j--) {
if (BRTransactionEq(manager->publishedTx[j - 1].tx, tx[i - 1]) &&
manager->publishedTx[j - 1].callback != NULL) isPublishing = 1;
}
if (! isPublishing && _BRTxPeerListCount(manager->txRelays, hash) == 0 &&
_BRTxPeerListCount(manager->txRequests, hash) == 0) {
peer_log(peer, "removing tx unconfirmed at: %d, txHash: %s", manager->lastBlock->height, u256hex(hash));
assert(tx[i - 1]->blockHeight == TX_UNCONFIRMED);
BRWalletRemoveTransaction(manager->wallet, hash);
}
else if (! isPublishing && _BRTxPeerListCount(manager->txRelays, hash) < manager->maxConnectCount) {
// set timestamp 0 to mark as unverified
BRWalletUpdateTransactions(manager->wallet, &hash, 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
array_add(manager->peers, ((BRPeer) { *addr, manager->params->standardPort, services, now - age, 0 }));
}
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++) {
array_add(manager->peers, ((BRPeer) { *addr, manager->params->standardPort, services, now, 0 }));
}
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) {
peer_log(peer, "selecting new download peer with higher reported lastblock");
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);
BRPublishedTx pubTx[array_count(manager->publishedTx)];
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));
pubTx[txCount++] = manager->publishedTx[i - 1];
manager->publishedTx[i - 1].callback = NULL;
manager->publishedTx[i - 1].info = NULL;
}
}
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++) {
pubTx[i].callback(pubTx[i].info, 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);
}
else {
BRTransactionFree(tx);
tx = NULL;
}
if (tx && isWalletTx) {
// reschedule sync timeout
if (manager->syncStartHeight > 0 && peer == manager->downloadPeer) {
BRPeerScheduleDisconnect(peer, PROTOCOL_TIMEOUT);
}
if (BRWalletAmountSentByTx(manager->wallet, tx) > 0 && BRWalletTransactionIsValid(manager->wallet, tx)) {
_BRPeerManagerAddTxToPublishList(manager, tx, NULL, NULL); // add valid send tx to mempool
}
// keep track of how many peers have or relay a tx, this indicates how likely the tx is to confirm
// (we only need to track this after syncing is complete)
if (manager->syncStartHeight == 0) relayCount = _BRTxPeerListAddPeer(&manager->txRelays, tx->txHash, peer);
_BRTxPeerListRemovePeer(manager->txRequests, tx->txHash, peer);
if (manager->bloomFilter != NULL) { // check if bloom filter is already being updated
BRAddress addrs[SEQUENCE_GAP_LIMIT_EXTERNAL + SEQUENCE_GAP_LIMIT_INTERNAL];
UInt160 hash;
// the transaction likely consumed one or more wallet addresses, so check that at least the next <gap limit>
// unused addresses are still matched by the bloom filter
BRWalletUnusedAddrs(manager->wallet, addrs, SEQUENCE_GAP_LIMIT_EXTERNAL, 0);
BRWalletUnusedAddrs(manager->wallet, addrs + SEQUENCE_GAP_LIMIT_EXTERNAL, SEQUENCE_GAP_LIMIT_INTERNAL, 1);
for (size_t i = 0; i < SEQUENCE_GAP_LIMIT_EXTERNAL + SEQUENCE_GAP_LIMIT_INTERNAL; i++) {
if (! BRAddressHash160(&hash, addrs[i].s) ||
BRBloomFilterContainsData(manager->bloomFilter, hash.u8, sizeof(hash))) continue;
if (manager->bloomFilter) BRBloomFilterFree(manager->bloomFilter);
manager->bloomFilter = NULL; // reset bloom filter so it's recreated with new wallet addresses
_BRPeerManagerUpdateFilter(manager);
break;
}
}
}
// set timestamp when tx is verified
if (tx && relayCount >= manager->maxConnectCount && tx->blockHeight == TX_UNCONFIRMED && tx->timestamp == 0) {
BRWalletUpdateTransactions(manager->wallet, &tx->txHash, 1, TX_UNCONFIRMED, (uint32_t)time(NULL));
}
pthread_mutex_unlock(&manager->lock);
if (txCallback) txCallback(txInfo, 0);