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udpnet.cpp
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// Copyright (c) 2016, 2017 Matt Corallo
// Unlike the rest of Bitcoin Core, this file is
// distributed under the Affero General Public License (AGPL v3)
#if defined(HAVE_CONFIG_H)
#include "config/bitcoin-config.h"
#endif
#include "udpnet.h"
#include "udprelay.h"
#include "net.h"
#include "netbase.h"
#include "utiltime.h"
#include <sys/socket.h>
#include <event2/event.h>
#include <boost/thread.hpp>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <thread>
#ifndef WIN32
#include <sched.h>
#include <pthread.h>
#include <unistd.h>
#endif
#define to_millis_double(t) (std::chrono::duration_cast<std::chrono::duration<double, std::chrono::milliseconds::period> >(t).count())
static std::vector<int> udp_socks; // The sockets we use to send/recv (bound to *:GetUDPInboundPorts()[*])
static bool last_sock_is_local;
std::recursive_mutex cs_mapUDPNodes;
std::map<CService, UDPConnectionState> mapUDPNodes;
std::atomic<uint64_t> min_per_node_mbps(1024);
bool maybe_have_write_nodes;
static std::map<int64_t, std::tuple<CService, uint64_t, size_t> > nodesToRepeatDisconnect;
static std::map<CService, UDPConnectionInfo> mapPersistentNodes;
static CService LOCAL_WRITE_DEVICE_SERVICE(CNetAddr(), 1);
static CService LOCAL_READ_DEVICE_SERVICE(CNetAddr(), 2);
#define LOCAL_DEVICE_CHECKSUM_MAGIC htole64(0xdeadbeef)
//TODO: The checksum stuff is not endian-safe (esp the poly impl):
static void FillChecksum(uint64_t magic, UDPMessage& msg, const unsigned int length) {
assert(length <= sizeof(UDPMessage));
uint8_t key[32/*POLY1305_KEYLEN*/]; // (32 bytes)
memcpy(key, &magic, sizeof(magic));
memcpy(key + 8, &magic, sizeof(magic));
memcpy(key + 16, &magic, sizeof(magic));
memcpy(key + 24, &magic, sizeof(magic));
uint8_t hash[32/*POLY1305_TAGLEN*/]; // (16 bytes)
//poly1305_auth(hash, (unsigned char*)&msg.header.msg_type, length - 16, key);
memcpy(&msg.header.chk1, hash, sizeof(msg.header.chk1));
memcpy(&msg.header.chk2, hash + 8, sizeof(msg.header.chk2));
for (unsigned int i = 0; i < length - 16; i += 8) {
for (unsigned int j = 0; j < 8 && i + j < length - 16; j++) {
((unsigned char*)&msg.header.msg_type) [i+j] ^= ((unsigned char*)&msg.header.chk1)[j];
}
}
}
static bool CheckChecksum(uint64_t magic, UDPMessage& msg, const unsigned int length) {
assert(length <= sizeof(UDPMessage));
for (unsigned int i = 0; i < length - 16; i += 8) {
for (unsigned int j = 0; j < 8 && i + j < length - 16; j++) {
((unsigned char*)&msg.header.msg_type) [i+j] ^= ((unsigned char*)&msg.header.chk1)[j];
}
}
uint8_t key[32/*POLY1305_KEYLEN*/]; // (32 bytes)
memcpy(key, &magic, sizeof(magic));
memcpy(key + 8, &magic, sizeof(magic));
memcpy(key + 16, &magic, sizeof(magic));
memcpy(key + 24, &magic, sizeof(magic));
uint8_t hash[16/*POLY1305_TAGLEN*/]; // (16 bytes)
//poly1305_auth(hash, (unsigned char*)&msg.header.msg_type, length - 16, key);
return !memcmp(&msg.header.chk1, hash, sizeof(msg.header.chk1)) && !memcmp(&msg.header.chk2, hash + 8, sizeof(msg.header.chk2));
}
/**
* Init/shutdown logic follows
*/
static struct event_base* event_base_read = NULL;
static event *timer_event;
static std::vector<event*> read_events;
static struct timeval timer_interval;
static void ThreadRunReadEventLoop() { event_base_dispatch(event_base_read); }
static void do_send_messages();
static void do_read_local_messages();
static std::atomic_bool local_read_messages_break(false);
static void send_messages_flush_and_break();
static void send_messages_init(const std::vector<std::pair<unsigned short, uint64_t> >& group_list, const std::tuple<int64_t, bool, std::string>& local_write_device);
static void ThreadRunWriteEventLoop() { do_send_messages(); }
static void ThreadRunLocalReadEventLoop() { do_read_local_messages(); }
static void read_socket_func(evutil_socket_t fd, short event, void* arg);
static void timer_func(evutil_socket_t fd, short event, void* arg);
static boost::thread *udp_read_thread = NULL, *udp_local_read_thread = NULL;
static std::vector<boost::thread> udp_write_threads;
static void OpenLocalDeviceConnection(bool fWrite);
static void StartLocalBackfillThread();
static std::tuple<int64_t, bool, std::string> get_local_device();
static void AddConnectionFromString(const std::string& node, bool fTrust) {
size_t host_port_end = node.find(',');
size_t local_pass_end = node.find(',', host_port_end + 1);
size_t remote_pass_end = node.find(',', local_pass_end + 1);
size_t group_end = node.find(',', remote_pass_end + 1);
if (host_port_end == std::string::npos || local_pass_end == std::string::npos || (remote_pass_end != std::string::npos && group_end != std::string::npos)) {
//LogPrintf("UDP: Failed to parse parameter to -add[trusted]udpnode: %s\n", node);
return;
}
std::string host_port = node.substr(0, host_port_end);
CService addr;
if (!Lookup(host_port.c_str(), addr, -1, true) || !addr.IsValid()) {
//LogPrintf("UDP: Failed to lookup hostname for -add[trusted]udpnode: %s\n", host_port);
return;
}
std::string local_pass = node.substr(host_port_end + 1, local_pass_end - host_port_end - 1);
uint64_t local_magic;// = Hash(&local_pass[0], &local_pass[0] + local_pass.size()).GetUint64(0);
std::string remote_pass;
if(remote_pass_end == std::string::npos)
remote_pass = node.substr(local_pass_end + 1);
else
remote_pass = node.substr(local_pass_end + 1, remote_pass_end - local_pass_end - 1);
uint64_t remote_magic;// = Hash(&remote_pass[0], &remote_pass[0] + local_pass.size()).GetUint64(0);
size_t group = 0;
if (remote_pass_end != std::string::npos) {
std::string group_str(node.substr(remote_pass_end + 1));
group = 0;//atoi64(group_str);
}
OpenPersistentUDPConnectionTo(addr, local_magic, remote_magic, fTrust, UDP_CONNECTION_TYPE_NORMAL, group);
}
static void AddConfAddedConnections() {
// if (gArgs.IsArgSet("-addudpnode")) {
// for (const std::string& node : gArgs.GetArgs("-addudpnode")) {
// AddConnectionFromString(node, false);
// }
// }
// if (gArgs.IsArgSet("-addtrustedudpnode")) {
// for (const std::string& node : gArgs.GetArgs("-addtrustedudpnode")) {
// AddConnectionFromString(node, true);
// }
// }
}
static void CloseSocketsAndReadEvents() {
for (event* ev : read_events)
event_free(ev);
for (int sock : udp_socks)
close(sock);
read_events.clear();
udp_socks.clear();
}
bool InitializeUDPConnections() {
assert(udp_write_threads.empty() && !udp_read_thread);
const std::vector<std::pair<unsigned short, uint64_t> > group_list(GetUDPInboundPorts());
for (std::pair<unsigned short, uint64_t> port : group_list) {
udp_socks.push_back(socket(AF_INET6, SOCK_DGRAM, 0));
assert(udp_socks.back());
int opt = 1;
assert(setsockopt(udp_socks.back(), SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == 0);
opt = 0;
assert(setsockopt(udp_socks.back(), IPPROTO_IPV6, IPV6_V6ONLY, &opt, sizeof(opt)) == 0);
fcntl(udp_socks.back(), F_SETFL, fcntl(udp_socks.back(), F_GETFL) | O_NONBLOCK);
struct sockaddr_in6 wildcard;
memset(&wildcard, 0, sizeof(wildcard));
wildcard.sin6_family = AF_INET6;
memcpy(&wildcard.sin6_addr, &in6addr_any, sizeof(in6addr_any));
wildcard.sin6_port = htons(port.first);
if (bind(udp_socks.back(), (sockaddr*) &wildcard, sizeof(wildcard))) {
CloseSocketsAndReadEvents();
return false;
}
//LogPrintf("UDP: Bound to port %hd for group %lu with %lu Mbps\n", port.first, udp_socks.size() - 1, port.second);
}
event_base_read = event_base_new();
if (!event_base_read) {
CloseSocketsAndReadEvents();
return false;
}
for (int socket : udp_socks) {
event *read_event = event_new(event_base_read, socket, EV_READ | EV_PERSIST, read_socket_func, NULL);
if (!read_event) {
event_base_free(event_base_read);
CloseSocketsAndReadEvents();
return false;
}
read_events.push_back(read_event);
event_add(read_event, NULL);
}
// Init local write device only after udp socks were all added to read_event
auto local_write_device = get_local_device();
if (std::get<0>(local_write_device)) {
int fd = open(std::get<2>(local_write_device).c_str(), O_WRONLY);
if (fd < 0) {
//LogPrintf("Failed to open -fecwritedevice, not running any FIBRE connections\n");
event_base_free(event_base_read);
CloseSocketsAndReadEvents();
return false;
}
udp_socks.push_back(fd);
}
timer_event = event_new(event_base_read, -1, EV_PERSIST, timer_func, NULL);
if (!timer_event) {
CloseSocketsAndReadEvents();
event_base_free(event_base_read);
return false;
}
timer_interval.tv_sec = 0;
timer_interval.tv_usec = 500*1000;
evtimer_add(timer_event, &timer_interval);
send_messages_init(group_list, local_write_device);
//udp_write_threads.emplace_back(boost::bind(&TraceThread<boost::function<void ()> >, "udpwrite", &ThreadRunWriteEventLoop));
AddConfAddedConnections();
if (std::get<0>(local_write_device)) {
OpenLocalDeviceConnection(true);
if (std::get<1>(local_write_device))
StartLocalBackfillThread();
}
// if (gArgs.IsArgSet("-fecreaddevice")) {
// OpenLocalDeviceConnection(false);
// udp_local_read_thread = new boost::thread(boost::bind(&TraceThread<void (*)()>, "udpreadlocal", &ThreadRunLocalReadEventLoop));
// }
BlockRecvInit();
// udp_read_thread = new boost::thread(boost::bind(&TraceThread<void (*)()>, "udpread", &ThreadRunReadEventLoop));
return true;
}
void StopUDPConnections() {
if (!udp_read_thread)
return;
event_base_loopbreak(event_base_read);
udp_read_thread->join();
delete udp_read_thread;
local_read_messages_break = true;
if (udp_local_read_thread) {
udp_local_read_thread->join();
delete udp_local_read_thread;
}
BlockRecvShutdown();
std::unique_lock<std::recursive_mutex> lock(cs_mapUDPNodes);
UDPMessage msg;
msg.header.msg_type = MSG_TYPE_DISCONNECT;
for (std::map<CService, UDPConnectionState>::iterator it = mapUDPNodes.begin(); it != mapUDPNodes.end(); it++)
SendMessage(msg, sizeof(UDPMessageHeader), true, it);
mapUDPNodes.clear();
send_messages_flush_and_break();
for (boost::thread& t : udp_write_threads)
t.join();
udp_write_threads.clear();
CloseSocketsAndReadEvents();
event_free(timer_event);
event_base_free(event_base_read);
}
/**
* Network handling follows
*/
static std::map<CService, UDPConnectionState>::iterator silent_disconnect(const std::map<CService, UDPConnectionState>::iterator& it) {
return mapUDPNodes.erase(it);
}
static std::map<CService, UDPConnectionState>::iterator send_and_disconnect(const std::map<CService, UDPConnectionState>::iterator& it) {
UDPMessage msg;
msg.header.msg_type = MSG_TYPE_DISCONNECT;
SendMessage(msg, sizeof(UDPMessageHeader), false, it);
int64_t now = GetTimeMillis();
while (!nodesToRepeatDisconnect.insert(std::make_pair(now + 1000, std::make_tuple(it->first, it->second.connection.remote_magic, it->second.connection.group))).second)
now++;
assert(nodesToRepeatDisconnect.insert(std::make_pair(now + 10000, std::make_tuple(it->first, it->second.connection.remote_magic, it->second.connection.group))).second);
return silent_disconnect(it);
}
void DisconnectNode(const std::map<CService, UDPConnectionState>::iterator& it) {
send_and_disconnect(it);
}
static void read_socket_func(evutil_socket_t fd, short event, void* arg) {
const bool fBench = true;//LogAcceptCategory(BCLog::BENCH);
std::chrono::steady_clock::time_point start(std::chrono::steady_clock::now());
UDPMessage msg;
struct sockaddr_in6 remoteaddr;
socklen_t remoteaddrlen = sizeof(remoteaddr);
ssize_t res = 1212;//recvfrom(fd, &msg, sizeof(msg), MSG_DONTWAIT, (sockaddr*)&remoteaddr, &remoteaddrlen);
if (res < 0) {
int err = errno;
//LogPrintf("UDP: Error reading from socket: %d (%s)!\n", err, strerror(err));
return;
}
assert(remoteaddrlen == sizeof(remoteaddr));
if (size_t(res) < sizeof(UDPMessageHeader) || size_t(res) >= sizeof(UDPMessage))
return;
std::unique_lock<std::recursive_mutex> lock(cs_mapUDPNodes);
std::map<CService, UDPConnectionState>::iterator it = mapUDPNodes.find(CService(remoteaddr));
if (it == mapUDPNodes.end())
return;
if (!CheckChecksum(it->second.connection.local_magic, msg, res))
return;
UDPConnectionState& state = it->second;
const uint8_t msg_type_masked = (msg.header.msg_type & UDP_MSG_TYPE_TYPE_MASK);
state.lastRecvTime = GetTimeMillis();
if (msg_type_masked == MSG_TYPE_SYN) {
if (res != sizeof(UDPMessageHeader) + 8) {
//LogPrintf("UDP: Got invalidly-sized SYN message from %s\n", it->first.ToString());
send_and_disconnect(it);
return;
}
state.protocolVersion = le64toh(msg.msg.longint);
if (PROTOCOL_VERSION_MIN(state.protocolVersion) > PROTOCOL_VERSION_CUR(UDP_PROTOCOL_VERSION)) {
//LogPrintf("UDP: Got min protocol version we didnt understand (%u:%u) from %s\n", PROTOCOL_VERSION_MIN(state.protocolVersion), PROTOCOL_VERSION_CUR(state.protocolVersion), it->first.ToString());
send_and_disconnect(it);
return;
}
if (!(state.state & STATE_GOT_SYN))
state.state |= STATE_GOT_SYN;
} else if (msg_type_masked == MSG_TYPE_KEEPALIVE) {
if (res != sizeof(UDPMessageHeader)) {
//LogPrintf("UDP: Got invalidly-sized KEEPALIVE message from %s\n", it->first.ToString());
send_and_disconnect(it);
return;
}
if ((state.state & STATE_INIT_COMPLETE) != STATE_INIT_COMPLETE)
//LogPrint(BCLog::UDPNET, "UDP: Successfully connected to %s!\n", it->first.ToString());
// If we get a SYNACK without a SYN, that probably means we were restarted, but the other side wasn't
// ...this means the other side thinks we're fully connected, so just switch to that mode
state.state |= STATE_GOT_SYN_ACK | STATE_GOT_SYN;
} else if (msg_type_masked == MSG_TYPE_DISCONNECT) {
//LogPrintf("UDP: Got disconnect message from %s\n", it->first.ToString());
silent_disconnect(it);
return;
}
if (!(state.state & STATE_INIT_COMPLETE))
return;
if (msg_type_masked == MSG_TYPE_BLOCK_HEADER || msg_type_masked == MSG_TYPE_BLOCK_CONTENTS) {
if (!HandleBlockTxMessage(msg, res, it->first, it->second, start)) {
send_and_disconnect(it);
return;
}
} else if (msg_type_masked == MSG_TYPE_TX_CONTENTS) {
//LogPrintf("UDP: Got tx message over the wire from %s, this isn't supposed to happen!\n", it->first.ToString());
send_and_disconnect(it);
return;
} else if (msg_type_masked == MSG_TYPE_PING) {
if (res != sizeof(UDPMessageHeader) + 8) {
//LogPrintf("UDP: Got invalidly-sized PING message from %s\n", it->first.ToString());
send_and_disconnect(it);
return;
}
msg.header.msg_type = MSG_TYPE_PONG;
SendMessage(msg, sizeof(UDPMessageHeader) + 8, false, it);
} else if (msg_type_masked == MSG_TYPE_PONG) {
if (res != sizeof(UDPMessageHeader) + 8) {
//LogPrintf("UDP: Got invalidly-sized PONG message from %s\n", it->first.ToString());
send_and_disconnect(it);
return;
}
uint64_t nonce = le64toh(msg.msg.longint);
std::map<uint64_t, int64_t>::iterator nonceit = state.ping_times.find(nonce);
/* if (nonceit == state.ping_times.end()) // Possibly duplicated packet
//LogPrintf("UDP: Got PONG message without PING from %s\n", it->first.ToString());
else*/ {
double rtt = (GetTimeMicros() - nonceit->second) / 1000.0;
//LogPrintf("UDP: RTT to %s is %lf ms\n", it->first.ToString(), rtt);
state.ping_times.erase(nonceit);
state.last_pings[state.last_ping_location] = rtt;
state.last_ping_location = (state.last_ping_location + 1) % (sizeof(state.last_pings) / sizeof(double));
}
}
if (fBench) {
std::chrono::steady_clock::time_point finish(std::chrono::steady_clock::now());
//if (to_millis_double(finish - start) > 1)
//LogPrintf("UDP: Packet took %lf ms to process\n", to_millis_double(finish - start));
}
}
static bool read_local_bytes(int fd, unsigned char* buf, size_t num) {
fd_set read_set;
struct timeval timeout;
while (!local_read_messages_break) {
FD_ZERO(&read_set);
FD_SET(fd, &read_set);
timeout.tv_sec = 0; timeout.tv_usec = 50 * 1000;
int res = select(fd + 1, &read_set, NULL, NULL, &timeout);
if (res > 0) {
ssize_t read_res = read(fd, buf, num);
if (read_res <= 0) return false;
buf += (size_t)read_res; num -= (size_t)read_res;
if (num == 0) return true;
continue;
}
if (res != 0) return false;
}
return false;
}
static void do_read_local_messages() {
std::string localUDPReadDevice/*(gArgs.GetArg("-fecreaddevice", ""))*/;
assert(localUDPReadDevice != "");
do {
int fd = open(localUDPReadDevice.c_str(), O_RDONLY);
assert(fd >= 0 && "Failed to open -fecreaddevice, please try again");
assert(fd <= FD_SETSIZE && "Failed to open -fecreaddevice, please try again");
while (!local_read_messages_break) {
// Scan forward until we find magic bytes
for (ssize_t i = 0; i < (ssize_t)sizeof(LOCAL_MAGIC_BYTES); i++) {
unsigned char c;
if (!read_local_bytes(fd, &c, 1))
break;
if (LOCAL_MAGIC_BYTES[i] != c) {
i = -1;
continue;
}
}
UDPMessage msg;
// UDPMessage is 1 byte larger than block messages
if (!read_local_bytes(fd, (unsigned char*)&msg, sizeof(UDPMessage) - 1))
break;
const bool fBench = true;//LogAcceptCategory(BCLog::BENCH);
std::chrono::steady_clock::time_point start(std::chrono::steady_clock::now());
std::unique_lock<std::recursive_mutex> lock(cs_mapUDPNodes);
std::map<CService, UDPConnectionState>::iterator it = mapUDPNodes.find(LOCAL_READ_DEVICE_SERVICE);
if (it == mapUDPNodes.end())
continue; // We lost our local node - it'll come back when we reconnect
if (!CheckChecksum(it->second.connection.local_magic, msg, sizeof(UDPMessage) - 1))
continue;
UDPConnectionState& state = it->second;
state.lastRecvTime = GetTimeMillis();
/* update bytes stat
* for speed calculations (mbps)
* example:
* ./bitcoind -fecreaddevice=/tmp/async_rx -fecstat=60
*/
// if (gArgs.IsArgSet("-fecstat")) {
// int avgInterval = atoi(gArgs.GetArg("-fecstat", ""));
// if (avgInterval <= 0) // invalid argument specified
// break;
// if (!state.lastAvgTime)
// state.lastAvgTime = GetTimeMillis();
// state.rcvdBytes += sizeof(UDPMessage) - 1;
// int64_t timeDelta = GetTimeMillis() - state.lastAvgTime;
// if (timeDelta > 1000*avgInterval) {
// // print statistics
// //LogPrintf("UDP[%d]: Average speed %.4f Mbit/sec\n",
// fd, (double)state.rcvdBytes*8*1000/(1024*1024*timeDelta));
// state.lastAvgTime = GetTimeMillis();
// state.rcvdBytes = 0;
// }
// }
const uint8_t msg_type_masked = (msg.header.msg_type & UDP_MSG_TYPE_TYPE_MASK);
if (msg_type_masked == MSG_TYPE_BLOCK_HEADER || msg_type_masked == MSG_TYPE_BLOCK_CONTENTS || msg_type_masked == MSG_TYPE_TX_CONTENTS) {
if (!HandleBlockTxMessage(msg, sizeof(UDPMessage) - 1, it->first, it->second, start)) {
send_and_disconnect(it);
continue;
}
} else {
// Huh? Only supposed to get block messages
continue;
}
if (fBench) {
std::chrono::steady_clock::time_point finish(std::chrono::steady_clock::now());
//if (to_millis_double(finish - start) > 1)
//LogPrintf("UDP: Packet took %lf ms to process\n", to_millis_double(finish - start));
}
}
close(fd);
} while (!local_read_messages_break);
}
static void OpenUDPConnectionTo(const CService& addr, const UDPConnectionInfo& info);
static void timer_func(evutil_socket_t fd, short event, void* arg) {
ProcessDownloadTimerEvents();
UDPMessage msg;
const int64_t now = GetTimeMillis();
std::unique_lock<std::recursive_mutex> lock(cs_mapUDPNodes);
{
std::map<int64_t, std::tuple<CService, uint64_t, size_t> >::iterator itend = nodesToRepeatDisconnect.upper_bound(now);
for (std::map<int64_t, std::tuple<CService, uint64_t, size_t> >::const_iterator it = nodesToRepeatDisconnect.begin(); it != itend; it++) {
msg.header.msg_type = MSG_TYPE_DISCONNECT;
SendMessage(msg, sizeof(UDPMessageHeader), false, std::get<0>(it->second), std::get<1>(it->second), std::get<2>(it->second));
}
nodesToRepeatDisconnect.erase(nodesToRepeatDisconnect.begin(), itend);
}
for (std::map<CService, UDPConnectionState>::iterator it = mapUDPNodes.begin(); it != mapUDPNodes.end();) {
boost::this_thread::interruption_point();
if (it->second.connection.connection_type != UDP_CONNECTION_TYPE_NORMAL) {
it++;
continue;
}
UDPConnectionState& state = it->second;
int64_t origLastSendTime = state.lastSendTime;
if (state.lastRecvTime < now - 1000 * 60 * 10) {
//LogPrint(BCLog::UDPNET, "UDP: Peer %s timed out\n", it->first.ToString());
it = send_and_disconnect(it); // Removes it from mapUDPNodes
continue;
}
if (!(state.state & STATE_GOT_SYN_ACK) && origLastSendTime < now - 1000) {
msg.header.msg_type = MSG_TYPE_SYN;
msg.msg.longint = htole64(UDP_PROTOCOL_VERSION);
SendMessage(msg, sizeof(UDPMessageHeader) + 8, false, it);
state.lastSendTime = now;
}
if ((state.state & STATE_GOT_SYN) && origLastSendTime < now - 1000 * ((state.state & STATE_GOT_SYN_ACK) ? 10 : 1)) {
msg.header.msg_type = MSG_TYPE_KEEPALIVE;
SendMessage(msg, sizeof(UDPMessageHeader), false, it);
state.lastSendTime = now;
}
if ((state.state & STATE_INIT_COMPLETE) == STATE_INIT_COMPLETE && state.lastPingTime < now - 1000 * 60 * 15) {
uint64_t pingnonce = 0;// GetRand(std::numeric_limits<uint64_t>::max());
msg.header.msg_type = MSG_TYPE_PING;
msg.msg.longint = htole64(pingnonce);
SendMessage(msg, sizeof(UDPMessageHeader) + 8, false, it);
state.ping_times[pingnonce] = GetTimeMicros();
state.lastPingTime = now;
}
for (std::map<uint64_t, int64_t>::iterator nonceit = state.ping_times.begin(); nonceit != state.ping_times.end();) {
if (nonceit->second < (now - 5000) * 1000)
nonceit = state.ping_times.erase(nonceit);
else
nonceit++;
}
it++;
}
for (const auto& conn : mapPersistentNodes) {
if (!mapUDPNodes.count(conn.first)) {
bool fWaitingOnDisconnect = false;
for (const auto& repeatNode : nodesToRepeatDisconnect) {
if (std::get<0>(repeatNode.second) == conn.first)
fWaitingOnDisconnect = true;
}
if (fWaitingOnDisconnect)
continue;
OpenUDPConnectionTo(conn.first, conn.second);
}
}
}
// ~10MB of outbound messages pending
#define PENDING_MESSAGES_BUFF_SIZE 8192
static std::atomic_bool send_messages_break(false);
std::mutex send_messages_mutex;
std::condition_variable send_messages_wake_cv;
struct PendingMessagesBuff {
std::tuple<CService, UDPMessage, unsigned int, uint64_t> messagesPendingRingBuff[PENDING_MESSAGES_BUFF_SIZE];
std::atomic<uint16_t> nextPendingMessage, nextUndefinedMessage;
PendingMessagesBuff() : nextPendingMessage(0), nextUndefinedMessage(0) {}
};
struct MessageStateCache {
ssize_t buff_id;
uint16_t nextPendingMessage;
uint16_t nextUndefinedMessage;
};
struct PerGroupMessageQueue {
std::array<PendingMessagesBuff, 3> buffs;
inline MessageStateCache NextBuff(std::memory_order order) {
for (size_t i = 0; i < buffs.size(); i++) {
uint16_t next_undefined_message = buffs[i].nextUndefinedMessage.load(order);
uint16_t next_pending_message = buffs[i].nextPendingMessage.load(order);
if (next_undefined_message != next_pending_message)
return {(ssize_t)i, next_pending_message, next_undefined_message};
}
return {-1, 0, 0};
}
uint64_t bw;
PerGroupMessageQueue() : bw(0) {}
PerGroupMessageQueue(PerGroupMessageQueue&& q) =delete;
};
static std::vector<PerGroupMessageQueue> messageQueues;
static const size_t LOCAL_RECEIVE_GROUP = (size_t)-1;
static size_t LOCAL_SEND_GROUP = (size_t)-1;
static inline void SendMessage(const UDPMessage& msg, const unsigned int length, PerGroupMessageQueue& queue, PendingMessagesBuff& buff, const CService& service, const uint64_t magic) {
std::unique_lock<std::mutex> lock(send_messages_mutex);
const uint16_t next_undefined_message_cache = buff.nextUndefinedMessage.load(std::memory_order_acquire);
const uint16_t next_pending_message_cache = buff.nextPendingMessage.load(std::memory_order_acquire);
if (next_pending_message_cache == (next_undefined_message_cache + 1) % PENDING_MESSAGES_BUFF_SIZE)
return;
std::tuple<CService, UDPMessage, unsigned int, uint64_t>& new_msg = buff.messagesPendingRingBuff[next_undefined_message_cache];
std::get<0>(new_msg) = service;
memcpy(&std::get<1>(new_msg), &msg, length);
std::get<2>(new_msg) = length;
std::get<3>(new_msg) = magic;
bool need_notify = next_undefined_message_cache == next_pending_message_cache;
buff.nextUndefinedMessage.store((next_undefined_message_cache + 1) % PENDING_MESSAGES_BUFF_SIZE, std::memory_order_release);
lock.unlock();
if (need_notify)
send_messages_wake_cv.notify_all();
}
void SendMessage(const UDPMessage& msg, const unsigned int length, bool high_prio, const CService& service, const uint64_t magic, size_t group) {
assert(length <= sizeof(UDPMessage));
if (group == LOCAL_RECEIVE_GROUP)
return;
assert(group < messageQueues.size());
PerGroupMessageQueue& queue = messageQueues[group];
PendingMessagesBuff& buff = high_prio ? queue.buffs[0] : queue.buffs[1];
SendMessage(msg, length, queue, buff, service, magic);
}
void SendMessage(const UDPMessage& msg, const unsigned int length, bool high_prio, const std::map<CService, UDPConnectionState>::const_iterator& node) {
SendMessage(msg, length, high_prio, node->first, node->second.connection.remote_magic, node->second.connection.group);
}
struct PerQueueSendState {
MessageStateCache buff_state;
std::chrono::steady_clock::time_point next_send;
size_t write_objs_per_call, bytes_per_obj, target_bytes_per_sec;
bool local, buff_emptied;
};
static inline bool fill_cache(PerQueueSendState* states, std::chrono::steady_clock::time_point& now) {
bool have_work = false;
for (size_t i = 0; i < messageQueues.size(); i++) {
if (states[i].next_send > now)
continue;
states[i].buff_state = messageQueues[i].NextBuff(std::memory_order_acquire);
if (states[i].buff_state.buff_id != -1) {
have_work = true;
break;
}
}
return have_work;
}
static void do_send_messages() {
#ifndef WIN32
{
struct sched_param sched{sched_get_priority_max(SCHED_RR)};
int res = pthread_setschedparam(pthread_self(), SCHED_RR, &sched);
//LogPrintf("UDP: %s write thread priority to SCHED_RR%s\n", !res ? "Set" : "Was unable to set", !res ? "" : (res == EPERM ? " (permission denied)" : " (other error)"));
if (res) {
res = nice(-20);
errno = 0;
//LogPrintf("UDP: %s write thread nice value to %d%s\n", !errno ? "Set" : "Was unable to set", res, !errno ? "" : (errno == EPERM ? " (permission denied)" : " (other error)"));
}
}
#endif
static const size_t WRITES_PER_SEC = 1000;
PerQueueSendState* states = (PerQueueSendState*)alloca(sizeof(PerQueueSendState) * messageQueues.size());
for (size_t i = 0; i < messageQueues.size(); i++) {
states[i].buff_state = {-1, 0, 0};
states[i].next_send = std::chrono::steady_clock::now();
states[i].local = last_sock_is_local && i == messageQueues.size() - 1;
states[i].target_bytes_per_sec = messageQueues[i].bw * (states[i].local ? 1 : 1024 * 1024) / 8;
states[i].bytes_per_obj = states[i].local ? (sizeof(UDPMessageHeader) + MAX_UDP_MESSAGE_LENGTH + sizeof(LOCAL_MAGIC_BYTES)) : PACKET_SIZE;
states[i].write_objs_per_call = std::max<size_t>(1, states[i].target_bytes_per_sec / WRITES_PER_SEC / states[i].bytes_per_obj / messageQueues.size());
states[i].buff_emptied = true;
}
while (true) {
std::chrono::steady_clock::time_point start(std::chrono::steady_clock::now());
if (send_messages_break)
return;
std::chrono::steady_clock::time_point sleep_until(start + std::chrono::minutes(60));
for (size_t group = 0; group < messageQueues.size(); group++) {
PerQueueSendState& send_state = states[group];
if (send_state.next_send > start) {
sleep_until = std::min(sleep_until, send_state.next_send);
continue;
}
size_t extra_writes = 0;
if (!send_state.buff_emptied) {
static_assert(std::is_same<std::chrono::steady_clock::time_point::period, std::nano>::value, "Better to math you with");
extra_writes = std::chrono::nanoseconds(start - send_state.next_send).count() * WRITES_PER_SEC * send_state.write_objs_per_call / std::nano::den;
}
if (send_state.buff_state.buff_id == -1 || // Skip if we got filled in in the locked check...
send_state.buff_state.nextPendingMessage == send_state.buff_state.nextUndefinedMessage || // ...or we're out of known messages
send_state.buff_state.buff_id == 0) // ...or we want to check for availability in a higher-priority buffer
send_state.buff_state = messageQueues[group].NextBuff(std::memory_order_acquire);
if (send_state.buff_state.buff_id == -1) {
send_state.buff_emptied = true;
continue;
}
PendingMessagesBuff* buff = &messageQueues[group].buffs[send_state.buff_state.buff_id];
size_t i = 0;
for (; i < send_state.write_objs_per_call + extra_writes && send_state.buff_state.buff_id != -1; i++) {
std::tuple<CService, UDPMessage, unsigned int, uint64_t>& msg = buff->messagesPendingRingBuff[send_state.buff_state.nextPendingMessage];
if (send_state.local) {
assert((std::get<1>(msg).header.msg_type & UDP_MSG_TYPE_TYPE_MASK) == MSG_TYPE_BLOCK_HEADER ||
(std::get<1>(msg).header.msg_type & UDP_MSG_TYPE_TYPE_MASK) == MSG_TYPE_BLOCK_CONTENTS ||
(std::get<1>(msg).header.msg_type & UDP_MSG_TYPE_TYPE_MASK) == MSG_TYPE_TX_CONTENTS);
}
FillChecksum(std::get<3>(msg), std::get<1>(msg), std::get<2>(msg));
if (send_state.local) {
assert(std::get<2>(msg) == sizeof(UDPMessage) - 1); // UDPMessage is 1 byte larger than block messages
if (write(udp_socks[group], &LOCAL_MAGIC_BYTES, sizeof(LOCAL_MAGIC_BYTES)) != sizeof(LOCAL_MAGIC_BYTES) ||
write(udp_socks[group], &std::get<1>(msg), std::get<2>(msg)) != std::get<2>(msg)) {
//TODO: Handle?
}
} else {
sockaddr_in6 remoteaddr;
memset(&remoteaddr, 0, sizeof(remoteaddr));
remoteaddr.sin6_family = AF_INET6;
assert(std::get<0>(msg).GetIn6Addr(&remoteaddr.sin6_addr));
remoteaddr.sin6_port = htons(std::get<0>(msg).GetPort());
if (sendto(udp_socks[group], &std::get<1>(msg), std::get<2>(msg), 0, (sockaddr*)&remoteaddr, sizeof(remoteaddr)) != std::get<2>(msg)) {
//TODO: Handle?
}
}
send_state.buff_state.nextPendingMessage = (send_state.buff_state.nextPendingMessage + 1) % PENDING_MESSAGES_BUFF_SIZE;
if (send_state.buff_state.nextPendingMessage == send_state.buff_state.nextUndefinedMessage) {
buff->nextPendingMessage.store(send_state.buff_state.nextPendingMessage, std::memory_order_release);
send_state.buff_state = messageQueues[group].NextBuff(std::memory_order_acquire);
if (send_state.buff_state.buff_id != -1)
buff = &messageQueues[group].buffs[send_state.buff_state.buff_id];
}
}
if (send_state.buff_state.buff_id != -1)
buff->nextPendingMessage.store(send_state.buff_state.nextPendingMessage, std::memory_order_release);
size_t non_extra_messages_sent = std::max<ssize_t>(std::min(i, send_state.write_objs_per_call), ssize_t(i) - extra_writes);
send_state.next_send = start + std::chrono::nanoseconds(1000ULL*1000*1000 * send_state.bytes_per_obj * non_extra_messages_sent / send_state.target_bytes_per_sec);
send_state.buff_emptied = false;
sleep_until = std::min(sleep_until, send_state.next_send);
}
std::chrono::steady_clock::time_point end(std::chrono::steady_clock::now());
if (sleep_until > end) { // No need to be aggressive here, fill_cache is useful to speed up per-queue loop anyway
if (fill_cache(states, end))
continue;
std::unique_lock<std::mutex> lock(send_messages_mutex);
if (!fill_cache(states, end))
send_messages_wake_cv.wait_until(lock, sleep_until);
}
}
}
//static void StartLocalBackfillThread() {
// assert(LOCAL_SEND_GROUP < messageQueues.size());
// boost::thread(boost::bind(&TraceThread<boost::function<void ()> >, "udpbackfill", [] {
// while (IsInitialBlockDownload() && !send_messages_break)
// std::this_thread::sleep_for(std::chrono::milliseconds(50));
// const CBlockIndex *lastBlock;
// CRollingBloomFilter sent_txn_bloom(500000, 0.001); // Hold 500k (~24*6 blocks of txn) txn
// {
// LOCK(cs_main);
// lastBlock = chainActive.Tip()->pprev;
// assert(lastBlock);
// }
// PerGroupMessageQueue& queue = messageQueues[LOCAL_SEND_GROUP];
// while (!send_messages_break) {
// while (!send_messages_break && queue.buffs[2].nextUndefinedMessage.load(std::memory_order_acquire) != queue.buffs[2].nextPendingMessage.load(std::memory_order_acquire))
// std::this_thread::sleep_for(std::chrono::milliseconds(5));
// int height;
// size_t send_txn = 0;
// {
// LOCK(cs_main);
// height = lastBlock->nHeight + 1;
// if (height < chainActive.Height() - 24 * 6) {
// height = chainActive.Height() - 24 * 6;
// } else if (height > chainActive.Height()) {
// send_txn = 2000;
// height = chainActive.Height() - 24 * 6;
// } else if (height > chainActive.Height() - 12 * 6)
// send_txn = 100;
// lastBlock = chainActive[height];
// }
// if (send_txn) {
// std::vector<CTransactionRef> txn_to_send;
// txn_to_send.reserve(send_txn);
// {
// std::set<uint256> txids_to_send;
// LOCK(mempool.cs);
// for (const auto& iter : mempool.mapTx.get<ancestor_score>()) {
// if (txn_to_send.size() >= send_txn)
// break;
// if (txids_to_send.count(iter.GetTx().GetHash()) || sent_txn_bloom.contains(iter.GetTx().GetHash()))
// continue;
// std::vector<CTransactionRef> to_add{iter.GetSharedTx()};
// while (!to_add.empty()) {
// bool has_dep = false;
// for (const CTxIn& txin : to_add.back()->vin) {
// CTxMemPool::txiter init = mempool.mapTx.find(txin.prevout.hash);
// if (init != mempool.mapTx.end() && !txids_to_send.count(txin.prevout.hash)) {
// to_add.emplace_back(init->GetSharedTx());
// has_dep = true;
// }
// }
// if (!has_dep) {
// if (txids_to_send.insert(to_add.back()->GetHash()).second) {
// sent_txn_bloom.insert(to_add.back()->GetHash());
// txn_to_send.emplace_back(std::move(to_add.back()));
// }
// to_add.pop_back();
// }
// }
// }
// }
// for (const CTransactionRef& tx : txn_to_send) {
// std::vector<UDPMessage> msgs;
// UDPFillMessagesFromTx(*tx, msgs);
// for (UDPMessage& msg : msgs) {
// SendMessage(msg, sizeof(UDPMessageHeader) + MAX_UDP_MESSAGE_LENGTH, queue, queue.buffs[2], LOCAL_WRITE_DEVICE_SERVICE, LOCAL_DEVICE_CHECKSUM_MAGIC);
// }
// }
// }
// //LogPrint(BCLog::UDPNET, "UDP: Building backfill block at height %d with hash %s\n", height, lastBlock->phashBlock->ToString());
// CBlock block;
// assert(ReadBlockFromDisk(block, lastBlock, Params().GetConsensus()));
// std::vector<UDPMessage> msgs;
// UDPFillMessagesFromBlock(block, msgs);
// for (UDPMessage& msg : msgs) {
// SendMessage(msg, sizeof(UDPMessageHeader) + MAX_UDP_MESSAGE_LENGTH, queue, queue.buffs[2], LOCAL_WRITE_DEVICE_SERVICE, LOCAL_DEVICE_CHECKSUM_MAGIC);
// }
// }
// })).detach();
//}
static std::tuple<int64_t, bool, std::string> get_local_device() {
std::string localUDPWriteDevice/*(gArgs.GetArg("-fecwritedevice", ""))*/;
if (localUDPWriteDevice == "")
return std::make_tuple((int64_t)0, false, std::string());
size_t bw_end = localUDPWriteDevice.find(',');
size_t backfill_end = localUDPWriteDevice.find(',', bw_end + 1);
if (bw_end == std::string::npos || backfill_end == std::string::npos) {
//LogPrintf("Failed to parse -fecwritedevice=bw,backfill,file option, not writing\n");
return std::make_tuple((int64_t)0, false, std::string());
}
std::string backfill_str(localUDPWriteDevice.substr(bw_end + 1, backfill_end - bw_end - 1));
if (backfill_str != "true" && backfill_str != "false") {
//LogPrintf("-fecwritedevice=bw,backfill,file backfill option must be true or false, not writing\n");
return std::make_tuple((int64_t)0, false, std::string());
}
int64_t bw = 1212;// atoi64(localUDPWriteDevice.substr(0, bw_end));
bool backfill = backfill_str == "true";
localUDPWriteDevice = localUDPWriteDevice.substr(backfill_end + 1);
return std::make_tuple(bw, backfill, localUDPWriteDevice);
}
static void send_messages_init(const std::vector<std::pair<unsigned short, uint64_t> >& group_list, const std::tuple<int64_t, bool, std::string>& local_write_device) {
messageQueues = std::vector<PerGroupMessageQueue>(group_list.size() + (std::get<0>(local_write_device) ? 1 : 0));
for (size_t i = 0; i < group_list.size(); i++)
messageQueues[i].bw = group_list[i].second;
if (std::get<0>(local_write_device)) {
LOCAL_SEND_GROUP = group_list.size();
messageQueues[LOCAL_SEND_GROUP].bw = std::get<0>(local_write_device);
last_sock_is_local = true;
} else {
last_sock_is_local = false;
}
}
static void send_messages_flush_and_break() {
send_messages_break = true;
send_messages_wake_cv.notify_all();
}
/**
* Public API follows
*/
std::vector<std::pair<unsigned short, uint64_t> > GetUDPInboundPorts()
{
// if (!gArgs.IsArgSet("-udpport")) return std::vector<std::pair<unsigned short, uint64_t> >();
std::map<size_t, std::pair<unsigned short, uint64_t> > res;
std::vector<std::string> vect_udpport; //= gArgs.GetArgs("-udpport");
for (const std::string& s : vect_udpport) {
size_t port_end = s.find(',');
size_t group_end = s.find(',', port_end + 1);
size_t bw_end = s.find(',', group_end + 1);
if (port_end == std::string::npos || (group_end != std::string::npos && bw_end != std::string::npos)) {
//LogPrintf("Failed to parse -udpport option, not starting FIBRE\n");
return std::vector<std::pair<unsigned short, uint64_t> >();
}
int64_t port = 1234;//atoi64(s.substr(0, port_end));
if (port != (unsigned short)port || port == 0) {
//LogPrintf("Failed to parse -udpport option, not starting FIBRE\n");
return std::vector<std::pair<unsigned short, uint64_t> >();
}