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Network.cpp
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/*
* This file is part of the BSGS distribution (https://github.com/JeanLucPons/Kangaroo).
* Copyright (c) 2020 Jean Luc PONS.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Kangaroo.h"
#include <fstream>
#include "SECPK1/IntGroup.h"
#include "Timer.h"
#include <string.h>
#define _USE_MATH_DEFINES
#include <math.h>
#include <algorithm>
#include <signal.h>
#ifndef WIN64
#include <pthread.h>
#else
#include "WindowsErrors.h"
#endif
using namespace std;
static SOCKET serverSock = 0;
// ------------------------------------------------------------------------------------------------------
// Common part
// ------------------------------------------------------------------------------------------------------
#define MAX_CLIENT 256
#define WAIT_FOR_READ 1
#define WAIT_FOR_WRITE 2
#define SERVER_VERSION 3
#define SERVER_HEADER 0x67DEDDC1
#define KANG_PER_BLOCK 2048
// Commands
#define SERVER_GETCONFIG 0
#define SERVER_STATUS 1
#define SERVER_SENDDP 2
#define SERVER_SETKNB 3
#define SERVER_SAVEKANG 4
#define SERVER_LOADKANG 5
#define SERVER_RESETDEAD 'R'
// Status
#define SERVER_OK 0
#define SERVER_END 1
#define SERVER_BACKUP 2
#ifdef WIN64
#define close_socket(s) closesocket(s)
typedef int socklen_t;
string GetNetworkError()
{
int err = WSAGetLastError();
bool found = false;
int i = 0;
while (!found && i < NBWSAERRORS)
{
found = (WSAERRORS[i].errCode == err);
if (!found)
i++;
}
if (!found)
{
char ret[256];
sprintf(ret, "WSA Error code %d", err);
return string(ret);
}
else
{
return string(WSAERRORS[i].mesg);
}
}
#else
#define close_socket(s) close(s)
string GetNetworkError()
{
return string(strerror(errno));
}
#endif
#define GET(name, s, b, bl, t) \
if ((nbRead = Read(s, (char *)(b), bl, t)) < 0) \
{ \
::printf("\nReadError(" name "): %s\n", lastError.c_str()); \
isConnected = false; \
close_socket(s); \
return false; \
}
#define PUT(name, s, b, bl, t) \
if ((nbWrite = Write(s, (char *)(b), bl, t)) < 0) \
{ \
::printf("\nWriteError(" name "): %s\n", lastError.c_str()); \
isConnected = false; \
close_socket(s); \
return false; \
}
#define GETFREE(name, s, b, bl, t, x) \
if ((nbRead = Read(s, (char *)(b), bl, t)) < 0) \
{ \
::printf("\nReadError(" name "): %s\n", lastError.c_str()); \
isConnected = false; \
::free(x); \
close_socket(s); \
return false; \
}
#define PUTFREE(name, s, b, bl, t, x) \
if ((nbWrite = Write(s, (char *)(b), bl, t)) < 0) \
{ \
::printf("\nWriteError(" name "): %s\n", lastError.c_str()); \
isConnected = false; \
::free(x); \
close_socket(s); \
return false; \
}
void sig_handler(int signo)
{
if (signo == SIGINT)
{
::printf("\nTerminated\n");
if (serverSock > 0)
close_socket(serverSock);
#ifdef WIN64
WSACleanup();
#endif
exit(0);
}
}
int Kangaroo::WaitFor(SOCKET sock, int timeout, int mode)
{
fd_set fdset;
fd_set *rd = NULL, *wr = NULL;
struct timeval tmout;
int result;
FD_ZERO(&fdset);
FD_SET(sock, &fdset);
if (mode == WAIT_FOR_READ)
rd = &fdset;
if (mode == WAIT_FOR_WRITE)
wr = &fdset;
tmout.tv_sec = (int)(timeout / 1000);
tmout.tv_usec = (int)(timeout % 1000) * 1000;
do
result = select((int)sock + 1, rd, wr, NULL, &tmout);
#ifdef WIN64
while (result < 0 && WSAGetLastError() == WSAEINTR);
#else
while (result < 0 && errno == EINTR);
#endif
if (result == 0)
{
lastError = "The operation timed out";
}
else if (result < 0)
{
lastError = GetNetworkError();
return 0;
}
return result;
}
int Kangaroo::Write(SOCKET sock, char *buf, int bufsize, int timeout)
{
int total_written = 0;
int written = 0;
while (bufsize > 0)
{
// Wait
if (!WaitFor(sock, timeout, WAIT_FOR_WRITE))
return -1;
// Write
do
written = send(sock, buf, bufsize, 0);
#ifdef WIN64
while (written == -1 && WSAGetLastError() == WSAEINTR);
#else
while (written == -1 && errno == EINTR);
#endif
if (written <= 0)
break;
buf += written;
total_written += written;
bufsize -= written;
}
if (written < 0)
{
lastError = GetNetworkError();
return -1;
}
if (bufsize != 0)
{
lastError = "Failed to send entire buffer";
return -1;
}
return total_written;
}
int Kangaroo::Read(SOCKET sock, char *buf, int bufsize, int timeout)
{ // Timeout in millisec
int rd = 0;
int total_read = 0;
while (bufsize > 0)
{
// Wait
if (!WaitFor(sock, timeout, WAIT_FOR_READ))
{
return -1;
}
// Read
do
rd = recv(sock, buf, bufsize, 0);
#ifdef WIN64
while (rd == -1 && WSAGetLastError() == WSAEINTR);
#else
while (rd == -1 && errno == EINTR);
#endif
if (rd <= 0)
break;
buf += rd;
total_read += rd;
bufsize -= rd;
}
if (rd < 0)
{
lastError = GetNetworkError();
return -1;
}
if (rd == 0)
{
lastError = "Connection closed";
return -1;
}
return total_read;
}
void Kangaroo::InitSocket()
{
#ifdef WIN64
// connect to Winscok DLL
WSADATA WSAData;
int err = WSAStartup(MAKEWORD(2, 2), &WSAData);
if (err != 0)
{
::printf("WSAStartup failed error : %d\n", err);
exit(-1);
}
#endif
}
// ------------------------------------------------------------------------------------------------------
// Server part
// ------------------------------------------------------------------------------------------------------
// Server status
int32_t Kangaroo::GetServerStatus()
{
if (endOfSearch)
{
return SERVER_END;
}
if (saveRequest)
{
return SERVER_BACKUP;
}
return SERVER_OK;
}
#define CLIENT_ABORT() \
::printf("\nClosing connection with %s\n", p->clientInfo); \
close_socket(p->clientSock); \
return false;
// Server request handler
bool Kangaroo::HandleRequest(TH_PARAM *p)
{
char cmdBuff;
uint32_t version = SERVER_VERSION;
int nbRead;
int nbWrite;
int32_t state;
while (p->isRunning)
{
// Wait for command (1h timeout)
nbRead = Read(p->clientSock, (char *)(&cmdBuff), 1, (int)(CLIENT_TIMEOUT * 1000.0));
if (nbRead <= 0)
{
CLIENT_ABORT();
}
switch (cmdBuff)
{
// ----------------------------------------------------------------------------------------
case SERVER_GETCONFIG:
{
::printf("\nNew connection from %s\n", p->clientInfo);
// Send config to the client
PUT("Version", p->clientSock, &version, sizeof(uint32_t), ntimeout);
PUT("RangeStart", p->clientSock, rangeStart.bits64, 32, ntimeout);
PUT("RangeEnd", p->clientSock, rangeEnd.bits64, 32, ntimeout);
PUT("KeyX", p->clientSock, keysToSearch[keyIdx].x.bits64, 32, ntimeout);
PUT("KeyY", p->clientSock, keysToSearch[keyIdx].y.bits64, 32, ntimeout);
PUT("DP", p->clientSock, &initDPSize, sizeof(int32_t), ntimeout);
}
break;
// ----------------------------------------------------------------------------------------
case SERVER_SETKNB:
{
GET("nbKangaroo", p->clientSock, &p->nbKangaroo, sizeof(uint64_t), ntimeout);
totalRW += p->nbKangaroo;
}
break;
// ----------------------------------------------------------------------------------------
case SERVER_RESETDEAD:
{
char response[5];
collisionInSameHerd = 0;
GET("flush", p->clientSock, &response, 2, ntimeout);
sprintf(response, "OK\n");
PUT("resp", p->clientSock, &response, 3, ntimeout);
}
break;
// ----------------------------------------------------------------------------------------
case SERVER_LOADKANG:
{
Int checkSum;
Int K;
uint64_t nbKangaroo = 0;
uint32_t strSize;
char fileName[256];
int128_t *KBuff;
uint32_t nbK;
uint32_t header = HEADKS;
uint32_t version = 0;
GET("fileNameLenght", p->clientSock, &strSize, sizeof(uint32_t), ntimeout);
if (strSize >= 256)
{
::printf("\nFileName too long (MAX=256) %s\n", p->clientInfo);
CLIENT_ABORT();
}
GET("fileName", p->clientSock, &fileName, strSize, ntimeout);
fileName[strSize] = 0;
FILE *f = fopen(fileName, "rb");
if (f == NULL)
{
// No backup
::printf("LoadKang: Cannot open %s for reading\n", fileName);
::printf("%s\n", ::strerror(errno));
PUT("nbKangaroo", p->clientSock, &nbKangaroo, sizeof(uint64_t), ntimeout);
break;
}
if (::fread(&header, sizeof(uint32_t), 1, f) != 1)
{
::printf("LoadKang: Cannot read from %s\n", fileName);
::printf("%s\n", ::strerror(errno));
::fclose(f);
CLIENT_ABORT();
}
if (header != HEADKS)
{
::printf("LoadKang: %s Not a compressed kangaroo file\n", fileName);
::printf("%s\n", ::strerror(errno));
::fclose(f);
CLIENT_ABORT();
}
::fread(&version, sizeof(uint32_t), 1, f);
::fread(&nbKangaroo, sizeof(uint64_t), 1, f);
PUT("nbKangaroo", p->clientSock, &nbKangaroo, sizeof(uint64_t), ntimeout);
checkSum.SetInt32(0);
KBuff = (int128_t *)malloc(KANG_PER_BLOCK * sizeof(int128_t));
while (nbKangaroo > 0)
{
if (nbKangaroo > KANG_PER_BLOCK)
{
nbK = KANG_PER_BLOCK;
}
else
{
nbK = (uint32_t)nbKangaroo;
}
for (uint32_t k = 0; k < nbK; k++)
{
::fread(&KBuff[k], 16, 1, f);
// Checksum
K.SetInt32(0);
K.bits64[1] = KBuff[k].i64[1];
K.bits64[0] = KBuff[k].i64[0];
checkSum.Add(&K);
}
PUTFREE("packet", p->clientSock, KBuff, nbK * 16, ntimeout, KBuff);
nbKangaroo -= nbK;
}
free(KBuff);
PUT("checkSum", p->clientSock, checkSum.bits64, 32, ntimeout);
::fclose(f);
}
break;
// ----------------------------------------------------------------------------------------
case SERVER_SAVEKANG:
{
Int checkSum;
Int K;
uint64_t nbKangaroo;
uint32_t fileNameSize;
char fileNameTmp[264];
char fileName[256];
int128_t *KBuff;
uint32_t nbK;
uint32_t header = HEADKS;
uint32_t version = 0;
GET("fileNameLenght", p->clientSock, &fileNameSize, sizeof(uint32_t), ntimeout);
if (fileNameSize >= 256)
{
::printf("\nFileName too long (MAX=256) %s\n", p->clientInfo);
CLIENT_ABORT();
}
GET("fileName", p->clientSock, &fileName, fileNameSize, ntimeout);
fileName[fileNameSize] = 0;
GET("nbKangaroo", p->clientSock, &nbKangaroo, sizeof(uint64_t), ntimeout);
strcpy(fileNameTmp, fileName);
strcat(fileNameTmp, ".tmp");
FILE *f = fopen(fileNameTmp, "wb");
if (f == NULL)
{
::printf("\nCannot open %s for writing\n", fileNameTmp);
::printf("%s\n", ::strerror(errno));
CLIENT_ABORT();
}
if (::fwrite(&header, sizeof(uint32_t), 1, f) != 1)
{
::printf("\nCannot write to %s\n", fileNameTmp);
::printf("%s\n", ::strerror(errno));
::fclose(f);
CLIENT_ABORT();
}
::fwrite(&version, sizeof(uint32_t), 1, f);
::fwrite(&nbKangaroo, sizeof(uint64_t), 1, f);
checkSum.SetInt32(0);
KBuff = (int128_t *)malloc(KANG_PER_BLOCK * sizeof(int128_t));
while (nbKangaroo > 0)
{
if (nbKangaroo > KANG_PER_BLOCK)
{
nbK = KANG_PER_BLOCK;
}
else
{
nbK = (uint32_t)nbKangaroo;
}
GETFREE("packet", p->clientSock, KBuff, nbK * 16, ntimeout, KBuff);
for (uint32_t k = 0; k < nbK; k++)
{
::fwrite(&KBuff[k], 16, 1, f);
// Checksum
K.SetInt32(0);
K.bits64[1] = KBuff[k].i64[1];
K.bits64[0] = KBuff[k].i64[0];
checkSum.Add(&K);
}
nbKangaroo -= nbK;
}
free(KBuff);
::fclose(f);
K.SetInt32(0);
GET("checksum", p->clientSock, K.bits64, 32, ntimeout);
if (!K.IsEqual(&checkSum))
{
::printf("\nWarning, Kangaroo backup wrong checksum %s\n", fileName);
}
else
{
remove(fileName);
rename(fileNameTmp, fileName);
}
}
break;
case SERVER_STATUS:
{
state = GetServerStatus();
PUT("Status", p->clientSock, &state, sizeof(int32_t), ntimeout);
}
break;
// ----------------------------------------------------------------------------------------
case SERVER_SENDDP:
{
DPHEADER head;
GET("DPHeader", p->clientSock, &head, sizeof(DPHEADER), ntimeout);
if (head.header != SERVER_HEADER)
{
::printf("\nUnexpected DP header from %s\n", p->clientInfo);
CLIENT_ABORT();
}
if (head.nbDP == 0)
{
::printf("\nUnexpected number of DP [%d] from %s\n", head.nbDP, p->clientInfo);
CLIENT_ABORT();
}
else
{
//::printf("%d DP from %s\n",nbDP,p->clientInfo.c_str());
DP *dp = (DP *)malloc(sizeof(DP) * head.nbDP);
GETFREE("DP", p->clientSock, dp, sizeof(DP) * head.nbDP, ntimeout, dp);
state = GetServerStatus();
PUTFREE("Status", p->clientSock, &state, sizeof(int32_t), ntimeout, dp);
if (nbRead != sizeof(DP) * head.nbDP)
{
::printf("\nUnexpected DP size from %s [nbDP=%d,Got %d,Expected %d]\n",
p->clientInfo, head.nbDP, nbRead, (int)(sizeof(DP) * head.nbDP));
free(dp);
CLIENT_ABORT();
}
else
{
// #define VALIDITY_POINT_CHECK
#ifdef VALIDITY_POINT_CHECK
// Check validity
for (uint32_t i = 0; i < head.nbDP; i++)
{
uint64_t h = (uint64_t)dp[i].h;
if (h >= HASH_SIZE)
{
::printf("\nInvalid data from: %s [dp=%d PID=%u thId=%u gpuId=%u]\n", p->clientInfo, i,
head.processId, head.threadId, head.gpuId);
free(dp);
CLIENT_ABORT();
}
Int dist;
uint32_t kType;
HashTable::CalcDistAndType(dp[i].d, &dist, &kType);
Point P = secp->ComputePublicKey(&dist);
if (kType == WILD)
P = secp->AddDirect(keyToSearch, P);
uint32_t hC = P.x.bits64[2] & HASH_MASK;
bool ok = (hC == h) && (P.x.bits64[0] == dp[i].x.i64[0]) && (P.x.bits64[1] == dp[i].x.i64[1]);
if (!ok)
{
if (kType == TAME)
{
::printf("\nWrong TAME point from: %s [dp=%d PID=%u thId=%u gpuId=%u]\n", p->clientInfo, i,
head.processId, head.threadId, head.gpuId);
}
else
{
::printf("\nWrong WILD point from: %s [dp=%d PID=%u thId=%u gpuId=%u]\n", p->clientInfo, i,
head.processId, head.threadId, head.gpuId);
}
//::printf("X=%s\n",P.x.GetBase16().c_str());
//::printf("X=%08X%08X%08X%08X\n",dp[i].x.i32[3],dp[i].x.i32[2],dp[i].x.i32[1],dp[i].x.i32[0]);
//::printf("D=%08X%08X%08X%08X\n",dp[i].d.i32[3],dp[i].d.i32[2],dp[i].d.i32[1],dp[i].d.i32[0]);
free(dp);
CLIENT_ABORT();
}
}
#endif
LOCK(ghMutex);
DP_CACHE dc;
dc.nbDP = head.nbDP;
dc.dp = dp;
recvDP.push_back(dc);
UNLOCK(ghMutex);
}
}
}
break;
default:
::printf("\nUnexpected command [%d] from %s\n", cmdBuff, p->clientInfo);
CLIENT_ABORT();
}
}
close_socket(p->clientSock);
return true;
}
// Threaded proc
#ifdef WIN64
DWORD WINAPI _acceptThread(LPVOID lpParam)
{
#else
void *_acceptThread(void *lpParam)
{
#endif
TH_PARAM *p = (TH_PARAM *)lpParam;
p->obj->AddConnectedClient();
p->obj->HandleRequest(p);
p->obj->RemoveConnectedClient();
p->obj->RemoveConnectedKangaroo(p->nbKangaroo);
p->isRunning = false;
free(p->clientInfo);
free(p);
return 0;
}
#ifdef WIN64
DWORD WINAPI _processServer(LPVOID lpParam)
{
#else
void *_processServer(void *lpParam)
{
#endif
Kangaroo *obj = (Kangaroo *)lpParam;
obj->ProcessServer();
return 0;
}
// Main server loop
void Kangaroo::AcceptConnections(SOCKET server_soc)
{
SOCKET clientSock;
::printf("Kangaroo server is ready and listening to TCP port %d ...\n", port);
while (true)
{
struct sockaddr_in client_add;
socklen_t len = sizeof(sockaddr_in);
if ((clientSock = accept(server_soc, (struct sockaddr *)&client_add, &len)) < 0)
{
::printf("Error: Invalid Socket returned by accept(): %s\n", GetNetworkError().c_str());
}
else
{
TH_PARAM *p = (TH_PARAM *)malloc(sizeof(TH_PARAM));
::memset(p, 0, sizeof(TH_PARAM));
char info[256];
::sprintf(info, "%s:%d", inet_ntoa(client_add.sin_addr), ntohs(client_add.sin_port));
#ifdef WIN64
p->clientInfo = ::_strdup(info);
#else
p->clientInfo = ::strdup(info);
#endif
p->obj = this;
p->isRunning = true;
p->clientSock = clientSock;
LaunchThread(_acceptThread, p);
}
}
}
// Starts the server
void Kangaroo::RunServer()
{
if (signal(SIGINT, sig_handler) == SIG_ERR)
::printf("\nWarning:can't install singal handler\n");
// Set starting parameters
InitRange();
InitSearchKey();
ComputeExpected((double)initDPSize, &expectedNbOp, &expectedMem);
::printf("Expected operations: 2^%.2f\n", log2(expectedNbOp));
::printf("Expected RAM: %.1fMB\n", expectedMem);
if (initDPSize < 0)
{
::printf("Error: Server must be launched with a specified number of distinguished bits (-d)\n");
exit(-1);
}
SetDP(initDPSize);
if (sizeof(DP) != 40)
{
::printf("Error: Invalid DP size struct\n");
exit(-1);
}
if (sizeof(DPHEADER) != 20)
{
::printf("Error: Invalid DPHEADER size struct\n");
exit(-1);
}
if (saveKangaroo)
{
::printf("Waring: Server does not support -ws, ignoring\n");
saveKangaroo = false;
}
// Main thread of server (handle backup and collision check)
LaunchThread(_processServer, (TH_PARAM *)this);
Timer::SleepMillis(100);
// Server stuff
InitSocket();
/* Create socket */
serverSock = socket(AF_INET, SOCK_STREAM, 0);
if (serverSock < 0)
{
::printf("Error: Invalid socket : %s\n", GetNetworkError().c_str());
exit(-1);
}
struct sockaddr_in soc_addr;
/* Reuse Address */
int32_t yes = 1;
if (setsockopt(serverSock, SOL_SOCKET, SO_REUSEADDR, (char *)&yes, sizeof(yes)) < 0)
{
::printf("Warning: Couldn't Reuse Address: %s\n", GetNetworkError().c_str());
}
memset(&soc_addr, 0, sizeof(soc_addr));
soc_addr.sin_family = AF_INET;
soc_addr.sin_port = htons(port);
soc_addr.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(serverSock, (struct sockaddr *)&soc_addr, sizeof(soc_addr)))
{
::printf("Error: Can not bind socket. Another server running?\n%s\n", GetNetworkError().c_str());
exit(-1);
}
if (listen(serverSock, MAX_CLIENT) < 0)
{
::printf("Error: Can not listen to socket\n%s\n", GetNetworkError().c_str());
exit(-1);
}
AcceptConnections(serverSock);
#ifdef WIN64
WSACleanup();
#endif
return;
}
// ------------------------------------------------------------------------------------------------------
// Client part
// ------------------------------------------------------------------------------------------------------
// Connection to the server
bool Kangaroo::ConnectToServer(SOCKET *retSock)
{
lastError = "";
// Resolve IP
if (!hostInfo)
{
if (signal(SIGINT, sig_handler) == SIG_ERR)
::printf("\nWarning:can't install singal handler\n");
InitSocket();
struct hostent *host_info;
host_info = gethostbyname(serverIp.c_str());
if (host_info == NULL)
{
lastError = "Unknown host:" + serverIp;
hostInfo = NULL;
hostInfoLength = 0;
return false;
}
else
{
hostInfoLength = host_info->h_length;
hostInfo = (char *)malloc(hostInfoLength);
::memcpy(hostInfo, host_info->h_addr, hostInfoLength);
hostAddrType = host_info->h_addrtype;
}
}
struct sockaddr_in server;
// Build TCP connection
SOCKET sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock < 0)
{
lastError = "Socket error: " + GetNetworkError();
return false;
}
// Use non blocking socket
#ifdef WIN64
unsigned long iMode = 0;
if (ioctlsocket(sock, FIONBIO, &iMode) != 0)
{
#else
if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1)
{
#endif
lastError = "Cannot use non blocking socket, " + GetNetworkError();
close_socket(sock);
return false;
}
// Connect
::memset(&server, 0, sizeof(sockaddr_in));
server.sin_family = hostAddrType;
::memcpy((char *)&server.sin_addr, hostInfo, hostInfoLength);
server.sin_port = htons(port);
int connectStatus = connect(sock, (struct sockaddr *)&server, sizeof(server));
#ifdef WIN64
if ((connectStatus < 0) && (WSAGetLastError() != WSAEINPROGRESS))
{
#else
if ((connectStatus < 0) && (errno != EINPROGRESS))
{
#endif
lastError = "Cannot connect to host: " + GetNetworkError();
close_socket(sock);
return false;
}
if (connectStatus < 0)
{
// Wait for connection
if (!WaitFor(sock, ntimeout, WAIT_FOR_WRITE))
{
lastError = "Cannot connect, unreachable host " + serverIp;
close_socket(sock);
return false;
}
// Check connection completion
int socket_err;
#ifdef WIN64
int serrlen = sizeof socket_err;
if (getsockopt(sock, SOL_SOCKET, SO_ERROR, (char *)&socket_err, &serrlen) != 0)
{
#else
socklen_t serrlen = sizeof(socket_err);
if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &socket_err, &serrlen) == -1)
{
#endif
lastError = "Cannot connect to host: " + GetNetworkError();
close_socket(sock);
return false;
}
if (socket_err != 0)
{
lastError = "Cannot connect to host: " + string(strerror(socket_err));
close_socket(sock);
return false;
}
}
int on = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
(const char *)&on, sizeof(on)) == -1)
{
lastError = "Socket error: setsockopt error SO_REUSEADDR";
close_socket(sock);
return false;
}
int flag = 1;
struct protoent *p;
p = getprotobyname("tcp");
if (setsockopt(sock, p->p_proto, TCP_NODELAY, (char *)&flag, sizeof(flag)) == -1)
{
lastError = "Socket error: setsockopt error TCP_NODELAY";
close_socket(sock);
return false;
}
*retSock = sock;
return true;
}
// Wait while server is not ready
void Kangaroo::WaitForServer()
{