-
#ifdef WIN32
#include <winsock2.h>
#else
#endif
#include "netbase.h"
-#include "util.h"
+#include "net.h"
+//#include "util.h"
+#include "ui_interface.h"
extern int GetRandInt(int nMax);
} l_fp;
-inline void Ntp2Unix(uint32_t &n, time_t &u)
-{
+inline void Ntp2Unix(uint32_t &n, time_t &u) {
// Ntp's time scale starts in 1900, Unix in 1970.
u = n - 0x83aa7e80; // 2208988800 1970 - 1900 in seconds
}
-inline void ntohl_fp(l_fp *n, l_fp *h)
-{
+inline void ntohl_fp(l_fp *n, l_fp *h) {
(h)->Ul_i.Xl_ui = ntohl((n)->Ul_i.Xl_ui);
(h)->Ul_f.Xl_uf = ntohl((n)->Ul_f.Xl_uf);
}
uint8_t mac[5 * sizeof(uint32_t)]; /* mac */
};
-int nServersCount = 103;
+const int nServersCount = 147;
-std::string NtpServers[103] = {
+std::string NtpServers[147] = {
// Microsoft
"time.windows.com",
"time3.google.com",
"time4.google.com",
+ // Hurricane Electric
+ "clock.sjc.he.net",
+ "clock.nyc.he.net",
+
+ // SixXS
+ "ntp.sixxs.net",
+ "ntp.eu.sixxs.net",
+ "ntp.us.sixxs.net",
+ "ntp.ap.sixxs.net",
+
// Russian Federation
+ "ntp.karelia.pro",
+ "ntp.alpet.me",
+ "aviel.alpet.me",
+ "ntp.sampo.ru",
+ "ntp.szt.ru",
"ntp.ix.ru",
"ntp1.stratum2.ru",
"ntp2.stratum2.ru",
"3.ru.pool.ntp.org",
// United States
+ "tock.cs.unlv.edu",
+ "timex.cs.columbia.edu",
+ "tick.cs.unlv.edu",
+ "sundial.columbia.edu",
+ "ntp-1.ece.cmu.edu",
+ "ntp-2.ece.cmu.edu",
+ "ntp1.cs.wisc.edu",
+ "ntp2.cs.wisc.edu",
+ "ntp3.cs.wisc.edu",
+ "ntp-01.caltech.edu",
+ "ntp-02.caltech.edu",
+ "ntp-03.caltech.edu",
+ "ntp-04.caltech.edu",
"nist1-pa.ustiming.org",
"time-a.nist.gov ",
"time-b.nist.gov ",
// United Kingdom
"ntp2d.mcc.ac.uk",
"ntp2c.mcc.ac.uk",
+ "ntp2b.mcc.ac.uk",
"ntp.exnet.com",
"ntp.cis.strath.ac.uk",
"ntppub.le.ac.uk",
"2.uk.pool.ntp.org",
"3.uk.pool.ntp.org",
+ // Canada
+ "chime.utoronto.ca",
+ "tick.utoronto.ca",
+ "time.nrc.ca",
+ "timelord.uregina.ca",
+ "tock.utoronto.ca",
+ "www1.cmc.ec.gc.ca",
+ "www2.cmc.ec.gc.ca",
+ "0.ca.pool.ntp.org",
+ "1.ca.pool.ntp.org",
+ "2.ca.pool.ntp.org",
+ "3.ca.pool.ntp.org",
+
// Japan
"ntp.nict.jp",
"0.jp.pool.ntp.org",
"2.jp.pool.ntp.org",
"3.jp.pool.ntp.org",
- // ... To be continued
-};
-
-bool InitWithRandom(SOCKET &sockfd, socklen_t &servlen, struct sockaddr *pcliaddr)
-{
- int nAttempt = 0;
-
- while(nAttempt < 100)
- {
- sockfd = -1;
- nAttempt++;
-
- int nServerNum = GetRandInt(nServersCount);
-
- std::vector<CNetAddr> vIP;
- bool fRet = LookupHost(NtpServers[nServerNum].c_str(), vIP, 10, true);
- if (!fRet)
- continue;
-
- struct sockaddr_in servaddr;
- servaddr.sin_family = AF_INET;
- servaddr.sin_port = htons(123);
-
- bool found = false;
- for(unsigned int i = 0; i < vIP.size(); i++)
- {
- if ((found = vIP[i].GetInAddr(&servaddr.sin_addr)))
- {
- break;
- }
- }
-
- if (!found)
- continue;
-
- sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+ // Australia
+ "ntp.cs.mu.oz.au",
+ "augean.eleceng.adelaide.edu.au",
+ "0.au.pool.ntp.org",
+ "1.au.pool.ntp.org",
+ "2.au.pool.ntp.org",
+ "3.au.pool.ntp.org",
- if (sockfd == INVALID_SOCKET)
- continue; // socket initialization error
+ // Slovenia
+ "time.ijs.si",
- if (connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) == -1 )
- {
- continue; // "connection" error
- }
-
- *pcliaddr = *((struct sockaddr *) &servaddr);
- servlen = sizeof(servaddr);
- return true;
- }
+ // ???
+ "clepsydra.dec.com",
- return false;
-}
+ // ... To be continued
+};
-bool InitWithHost(std::string &strHostName, SOCKET &sockfd, socklen_t &servlen, struct sockaddr *pcliaddr)
-{
+bool InitWithHost(std::string &strHostName, SOCKET &sockfd, socklen_t &servlen, struct sockaddr *pcliaddr) {
sockfd = -1;
std::vector<CNetAddr> vIP;
bool fRet = LookupHost(strHostName.c_str(), vIP, 10, true);
- if (!fRet)
+ if (!fRet) {
return false;
+ }
struct sockaddr_in servaddr;
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(123);
bool found = false;
- for(unsigned int i = 0; i < vIP.size(); i++)
- {
- if ((found = vIP[i].GetInAddr(&servaddr.sin_addr)))
- {
+ for(unsigned int i = 0; i < vIP.size(); i++) {
+ if ((found = vIP[i].GetInAddr(&servaddr.sin_addr))) {
break;
}
}
- if (!found)
+ if (!found) {
return false;
+ }
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd == INVALID_SOCKET)
return false; // socket initialization error
- if (connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) == -1 )
- {
+ if (connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) == -1 ) {
return false; // "connection" error
}
return true;
}
+bool InitWithRandom(SOCKET &sockfd, socklen_t &servlen, struct sockaddr *pcliaddr) {
-int64_t DoReq(SOCKET sockfd, socklen_t servlen, struct sockaddr cliaddr)
-{
+ for (int nAttempt = 0; nAttempt < nServersCount; nAttempt++) {
+ int nServerNum = GetRandInt(nServersCount);
+ if (InitWithHost(NtpServers[nServerNum], sockfd, servlen, pcliaddr)) {
+ return true;
+ }
+ }
+ return false;
+}
+
+int64_t DoReq(SOCKET sockfd, socklen_t servlen, struct sockaddr cliaddr) {
#ifdef WIN32
u_long nOne = 1;
- if (ioctlsocket(sockfd, FIONBIO, &nOne) == SOCKET_ERROR)
- {
+ if (ioctlsocket(sockfd, FIONBIO, &nOne) == SOCKET_ERROR) {
printf("ConnectSocket() : ioctlsocket non-blocking setting failed, error %d\n", WSAGetLastError());
#else
- if (fcntl(sockfd, F_SETFL, O_NONBLOCK) == SOCKET_ERROR)
- {
+ if (fcntl(sockfd, F_SETFL, O_NONBLOCK) == SOCKET_ERROR) {
printf("ConnectSocket() : fcntl non-blocking setting failed, error %d\n", errno);
#endif
return -2;
int len=48;
int retcode = sendto(sockfd, (char *) msg, len, 0, &cliaddr, servlen);
if (retcode < 0) {
- printf("sendto() failed: %d", retcode);
+ printf("sendto() failed: %d\n", retcode);
return -3;
}
fd_set fdset;
- struct timeval timeout = {5, 0};
+ struct timeval timeout = {10, 0};
FD_ZERO(&fdset);
FD_SET(sockfd, &fdset);
retcode = select(sockfd + 1, &fdset, NULL, NULL, &timeout);
- if (retcode <= 0)
- {
- printf("recvfrom() error");
+ if (retcode <= 0) {
+ printf("recvfrom() error\n");
return -4;
}
recvfrom(sockfd, (char *) msg, len, 0, NULL, NULL);
-
- ntohl_fp(&msg->rec, &prt->rec);
ntohl_fp(&msg->xmt, &prt->xmt);
-
- time_t seconds_receive;
time_t seconds_transmit;
-
- Ntp2Unix(prt->rec.Ul_i.Xl_ui, seconds_receive);
Ntp2Unix(prt->xmt.Ul_i.Xl_ui, seconds_transmit);
delete msg;
delete prt;
- return (seconds_receive + seconds_transmit) / 2;
+ return seconds_transmit;
}
-int64_t NtpGetTime()
-{
+int64_t NtpGetTime(CNetAddr& ip) {
struct sockaddr cliaddr;
SOCKET sockfd;
if (!InitWithRandom(sockfd, servlen, &cliaddr))
return -1;
+ ip = CNetAddr(((sockaddr_in *)&cliaddr)->sin_addr);
int64_t nTime = DoReq(sockfd, servlen, cliaddr);
closesocket(sockfd);
return nTime;
}
-int64_t NtpGetTime(CNetAddr& ip)
+int64_t NtpGetTime(std::string &strHostName)
{
struct sockaddr cliaddr;
SOCKET sockfd;
socklen_t servlen;
- if (!InitWithRandom(sockfd, servlen, &cliaddr))
+ if (!InitWithHost(strHostName, sockfd, servlen, &cliaddr))
return -1;
- ip = CNetAddr(((sockaddr_in *)&cliaddr)->sin_addr);
int64_t nTime = DoReq(sockfd, servlen, cliaddr);
closesocket(sockfd);
return nTime;
}
-int64_t NtpGetTime(std::string &strHostName)
-{
- struct sockaddr cliaddr;
+// NTP server, which we unconditionally trust. This may be your own installation of ntpd somewhere, for example.
+// "localhost" means "trust no one"
+std::string strTrustedUpstream = "localhost";
- SOCKET sockfd;
- socklen_t servlen;
+// Current offset
+int64_t nNtpOffset = INT64_MAX;
- if (!InitWithHost(strHostName, sockfd, servlen, &cliaddr))
- return -1;
+int64_t GetNtpOffset() {
+ return nNtpOffset;
+}
- int64_t nTime = DoReq(sockfd, servlen, cliaddr);
+void ThreadNtpSamples(void* parg) {
+ const int64_t nMaxOffset = 86400; // Not a real limit, just sanity threshold.
- closesocket(sockfd);
+ printf("Trying to find NTP server at localhost...\n");
- return nTime;
+ std::string strLocalHost = "127.0.0.1";
+ if (NtpGetTime(strLocalHost) == GetTime()) {
+ printf("There is NTP server active at localhost, we don't need NTP thread.\n");
+
+ nNtpOffset = 0;
+ return;
+ }
+
+ printf("ThreadNtpSamples started\n");
+ vnThreadsRunning[THREAD_NTP]++;
+
+ // Make this thread recognisable as time synchronization thread
+ RenameThread("novacoin-ntp-samples");
+
+ CMedianFilter<int64_t> vTimeOffsets(200,0);
+
+ while (!fShutdown) {
+ if (strTrustedUpstream != "localhost") {
+ // Trying to get new offset sample from trusted NTP server.
+ int64_t nClockOffset = NtpGetTime(strTrustedUpstream) - GetTime();
+
+ if (abs64(nClockOffset) < nMaxOffset) {
+ // Everything seems right, remember new trusted offset.
+ printf("ThreadNtpSamples: new offset sample from %s, offset=%" PRId64 ".\n", strTrustedUpstream.c_str(), nClockOffset);
+ nNtpOffset = nClockOffset;
+ }
+ else {
+ // Something went wrong, disable trusted offset sampling.
+ nNtpOffset = INT64_MAX;
+ strTrustedUpstream = "localhost";
+
+ int nSleepMinutes = 1 + GetRandInt(9); // Sleep for 1-10 minutes.
+ for (int i = 0; i < nSleepMinutes * 60 && !fShutdown; i++)
+ Sleep(1000);
+
+ continue;
+ }
+ }
+ else {
+ // Now, trying to get 2-4 samples from random NTP servers.
+ int nSamplesCount = 2 + GetRandInt(2);
+
+ for (int i = 0; i < nSamplesCount; i++) {
+ CNetAddr ip;
+ int64_t nClockOffset = NtpGetTime(ip) - GetTime();
+
+ if (abs64(nClockOffset) < nMaxOffset) { // Skip the deliberately wrong timestamps
+ printf("ThreadNtpSamples: new offset sample from %s, offset=%" PRId64 ".\n", ip.ToString().c_str(), nClockOffset);
+ vTimeOffsets.input(nClockOffset);
+ }
+ }
+
+ if (vTimeOffsets.size() > 1) {
+ nNtpOffset = vTimeOffsets.median();
+ }
+ else {
+ // Not enough offsets yet, try to collect additional samples later.
+ nNtpOffset = INT64_MAX;
+ int nSleepMinutes = 1 + GetRandInt(4); // Sleep for 1-5 minutes.
+ for (int i = 0; i < nSleepMinutes * 60 && !fShutdown; i++)
+ Sleep(1000);
+ continue;
+ }
+ }
+
+ if (GetNodesOffset() == INT_MAX && abs64(nNtpOffset) > 40 * 60)
+ {
+ // If there is not enough node offsets data and NTP time offset is greater than 40 minutes then give a warning.
+ std::string strMessage = _("Warning: Please check that your computer's date and time are correct! If your clock is wrong NovaCoin will not work properly.");
+ strMiscWarning = strMessage;
+ printf("*** %s\n", strMessage.c_str());
+ uiInterface.ThreadSafeMessageBox(strMessage+" ", std::string("NovaCoin"), CClientUIInterface::OK | CClientUIInterface::ICON_EXCLAMATION);
+ }
+
+ printf("nNtpOffset = %+" PRId64 " (%+" PRId64 " minutes)\n", nNtpOffset, nNtpOffset/60);
+
+ int nSleepHours = 1 + GetRandInt(5); // Sleep for 1-6 hours.
+ for (int i = 0; i < nSleepHours * 3600 && !fShutdown; i++)
+ Sleep(1000);
+ }
+
+ vnThreadsRunning[THREAD_NTP]--;
+ printf("ThreadNtpSamples exited\n");
}