int CAddrMan::RandomInt(int nMax){
return GetRandInt(nMax);
}
/**
* The only time good is called, is during the version message exchange, for inbound it was added first and any address problems
* looked over and fixed. For outbound, what we have, was likely what was used to make the connection, so it must have been good
* or this would not have been called.
* Still we may have services and port details incorrect in our database, and so any object differences can be corrected, if
* a change is made to how this routine is called, from passing a CService to a CAddress object we can have the programmer fix
* any problems before making this call, we'll look for, and fix the differences, if they show up here.
*/
void CAddrMan::Good_(const CAddress& addr, int64_t nTime)
{
bool fChanged = false;
int nId;
CAddrInfo* pinfo = Find(addr, &nId); // This matches on the CNetAddr portion of the object only aka the ip/i2p only
// if not found, bail out
if (!pinfo) {
LogPrint( "addrman", "Marking as good failed, expected to find %s\n", addr.ToString() );
return;
}
CAddrInfo& info = *pinfo; // Only really for convenience, not really needed
// check whether we are talking about the exact same CService (that includes the same port)
if( (CService)info != (CService)addr) {
assert( info.GetPort() != addr.GetPort() ); // The only reason which could cause a mismatch, or we have a serious programming problem
LogPrint( "addrman", "While marking %s as good, it was found that port %d does not match our record, now updated.\n", info.ToString(), addr.GetPort() );
info.SetPort( addr.GetPort() );
fChanged = true;
}
// Ok so now we know that at least the CService details all match, lets check and fix the CAddress service bits for this peer, if its listed wrong, fix it.
if( info.nServices != addr.nServices ) {
LogPrint( "addrman", "While marking %s as good, the peer services was found to have changed from 0x%016x to 0x%016x, now updated.\n", info.ToString(), info.nServices, addr.nServices );
info.nServices = addr.nServices;
fChanged = true;
}
// update info
info.nLastSuccess = nTime;
info.nLastTry = nTime;
info.nAttempts = 0;
// info.nTime = nTime;
// nTime is not updated here, to avoid leaking information about
// currently-connected peers.
// if it is already in the tried set, don't do anything else, except report we were here
if(info.fInTried ) {
if( !fChanged )
LogPrint( "addrman", "Marked as good peer %s\n", info.ToString() );
return;
}
// find a bucket it is in now
int nRnd = GetRandInt(ADDRMAN_NEW_BUCKET_COUNT);
int nUBucket = -1;
for (unsigned int n = 0; n < ADDRMAN_NEW_BUCKET_COUNT; n++) {
int nB = (n + nRnd) % ADDRMAN_NEW_BUCKET_COUNT;
int nBpos = info.GetBucketPosition(nKey, true, nB);
if (vvNew[nB][nBpos] == nId) {
nUBucket = nB;
break;
}
}
// if no bucket is found, something bad happened;
// TODO: maybe re-add the node, but for now, just bail out
if( nUBucket == -1 ) {
LogPrint( "addrman", "Fatal error while trying to add %s to tried, bucket not found\n", info.ToString() );
return;
}
LogPrint("addrman", "Moving %s to tried\n", addr.ToString());
// move nId to the tried tables
MakeTried(info, nId);
}
bool CAddrMan::Add_(const CAddress& addrIn, const CNetAddr& source, int64_t nTimePenalty)
{
#ifdef I2PADDRMAN_EXTENSIONS
//! We now need to check for an possibly modify the CAddress object for the garliccat field, so we make a local copy
CAddress addr = addrIn;
/**
* Before we can add an address, even before we can test if its Routable, or use the Find command to match correctly,
* we need to make sure that any I2P addresses have the GarlicCat field setup correctly in the IP area of the
* CNetAddr portion of a given CAddress->CService->CNetAddr object, this should have already been done, but
* double checking it here also insures we do not get a polluted b32 hash map
*/
if( addr.CheckAndSetGarlicCat() )
LogPrint( "addrman", "While adding an i2p destination, did not expect to need the garliccat fixed for %s\n", addr.ToString() );
#endif
if( !addr.IsRoutable() ) {
LogPrint( "addrman", "While adding an address, did not expect to find it unroutable: %s\n", addr.ToString() );
return false;
}
bool fNew = false;
int nId;
/**
* Find Matches by CNetAddr objects, and returns the CAddrInfo object it finds, which is fine and what we want normally
* however this means the ports can be different (CService), and other details in the CAddress portion, such as nServices
* should not simply be 'or'd with what was found, sometimes we have to remove services in the version exchange that
* peers report incorrectly, and having the port wrong means when Good_ is called that the objects do not match exactly.
*/
CAddrInfo* pinfo = Find(addr, &nId);
if (pinfo)
{
// periodically update nTime
bool fCurrentlyOnline = (GetAdjustedTime() - addr.nTime < 24 * 60 * 60);
int64_t nUpdateInterval = (fCurrentlyOnline ? 60 * 60 : 24 * 60 * 60);
if (addr.nTime && (!pinfo->nTime || pinfo->nTime < addr.nTime - nUpdateInterval - nTimePenalty))
pinfo->nTime = std::max((int64_t)0, addr.nTime - nTimePenalty);
/**
* Only do the following, IF the source of this information is the node itself (source),
* otherwise we're just constantly changing the details, while getting addresses from peers.
*
* The call (to addrman.Add()) which puts us here, happens at the end of a version message exchange,
* for inbound connections only.
* For outbound connections, we only have a call to good, if the connection is made.
* Other places addrman.Add() is called is for address seeding and user lookup, see net.cpp for those details
*/
if( (CNetAddr)addr == source ) {
/**
* add services, don't just 'or' them in here, hard set them to the correct value
* original code: pinfo->nServices |= addr.nServices;
* ToDo: Why this and the port value has not been fixed as standard procedure could be investigated in more detail
* for now Anoncoin has so many unique problems with these 2 values, this should help correct allot of the
* current network issues in regard to the values getting corrected over time.
*/
if( pinfo->nServices != addr.nServices ) {
LogPrint( "addrman", "Updating peer record %s, the services listed needed to be changed. From 0x%016x To 0x%016x\n", pinfo->ToString(), pinfo->nServices, addr.nServices );
pinfo->nServices = addr.nServices;
}
if( pinfo->GetPort() != addr.GetPort() ) {
LogPrint( "addrman", "Updating peer record %s, port %d was wrong, changed it to %d\n", pinfo->ToString(), pinfo->GetPort(), addr.GetPort() );
pinfo->SetPort( addr.GetPort() );
}
}
// do not update if no new information is present
if (!addr.nTime || (pinfo->nTime && addr.nTime <= pinfo->nTime))
return false;
// do not update if the entry was already in the "tried" table
if (pinfo->fInTried)
return false;
// do not update if the max reference count is reached
if (pinfo->nRefCount == ADDRMAN_NEW_BUCKETS_PER_ADDRESS)
return false;
// stochastic test: previous nRefCount == N: 2^N times harder to increase it
int nFactor = 1;
for (int n = 0; n < pinfo->nRefCount; n++)
nFactor *= 2;
if (nFactor > 1 && (GetRandInt(nFactor) != 0))
return false;
} else {
pinfo = Create(addr, source, &nId);
pinfo->nTime = std::max((int64_t)0, (int64_t)pinfo->nTime - nTimePenalty);
nNew++;
fNew = true;
}
int nUBucket = pinfo->GetNewBucket(nKey, source);
int nUBucketPos = pinfo->GetBucketPosition(nKey, true, nUBucket);
if (vvNew[nUBucket][nUBucketPos] != nId) {
bool fInsert = vvNew[nUBucket][nUBucketPos] == -1;
if (!fInsert) {
CAddrInfo& infoExisting = mapInfo[vvNew[nUBucket][nUBucketPos]];
if (infoExisting.IsTerrible() || (infoExisting.nRefCount > 1 && pinfo->nRefCount == 0)) {
// Overwrite the existing new table entry.
fInsert = true;
}
}
if (fInsert) {
ClearNew(nUBucket, nUBucketPos);
pinfo->nRefCount++;
vvNew[nUBucket][nUBucketPos] = nId;
} else {
if (pinfo->nRefCount == 0) {
Delete(nId);
}
}
}
return fNew;
}
int64_t DoReq(SOCKET sockfd, socklen_t servlen, struct sockaddr cliaddr) {
#ifdef WIN32
u_long nOne = 1;
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) {
printf("ConnectSocket() : fcntl non-blocking setting failed, error %d\n", errno);
#endif
return -2;
}
struct timeval timeout = {10, 0};
struct pkt *msg = new pkt;
struct pkt *prt = new pkt;
time_t seconds_transmit;
int len = 48;
msg->li_vn_mode=227;
msg->stratum=0;
msg->ppoll=4;
msg->precision=0;
msg->rootdelay=0;
msg->rootdispersion=0;
msg->ref.Ul_i.Xl_i=0;
msg->ref.Ul_f.Xl_f=0;
msg->org.Ul_i.Xl_i=0;
msg->org.Ul_f.Xl_f=0;
msg->rec.Ul_i.Xl_i=0;
msg->rec.Ul_f.Xl_f=0;
msg->xmt.Ul_i.Xl_i=0;
msg->xmt.Ul_f.Xl_f=0;
int retcode = sendto(sockfd, (char *) msg, len, 0, &cliaddr, servlen);
if (retcode < 0) {
printf("sendto() failed: %d\n", retcode);
seconds_transmit = -3;
goto _end;
}
fd_set fdset;
FD_ZERO(&fdset);
FD_SET(sockfd, &fdset);
retcode = select(sockfd + 1, &fdset, NULL, NULL, &timeout);
if (retcode <= 0) {
printf("recvfrom() error\n");
seconds_transmit = -4;
goto _end;
}
recvfrom(sockfd, (char *) msg, len, 0, NULL, NULL);
ntohl_fp(&msg->xmt, &prt->xmt);
Ntp2Unix(prt->xmt.Ul_i.Xl_ui, seconds_transmit);
_end:
delete msg;
delete prt;
return seconds_transmit;
}
int64_t NtpGetTime(CNetAddr& ip) {
struct sockaddr cliaddr;
SOCKET sockfd;
socklen_t servlen;
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(const std::string &strHostName)
{
struct sockaddr cliaddr;
SOCKET sockfd;
socklen_t servlen;
if (!InitWithHost(strHostName, sockfd, servlen, &cliaddr))
return -1;
int64_t nTime = DoReq(sockfd, servlen, cliaddr);
closesocket(sockfd);
return nTime;
}
// 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";
// Current offset
int64_t nNtpOffset = INT64_MAX;
int64_t GetNtpOffset() {
return nNtpOffset;
}
void ThreadNtpSamples(void* parg) {
const int64_t nMaxOffset = 86400; // Not a real limit, just sanity threshold.
printf("Trying to find NTP server at localhost...\n");
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("eCoin-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 eCoin will not work properly.");
strMiscWarning = strMessage;
printf("*** %s\n", strMessage.c_str());
uiInterface.ThreadSafeMessageBox(strMessage+" ", std::string("eCoin"), 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");
}