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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <banman.h>
#include <netaddress.h>
#include <ui_interface.h>
#include <util/system.h>
#include <util/time.h>
BanMan::BanMan(fs::path ban_file, CClientUIInterface* client_interface, int64_t default_ban_time)
: m_client_interface(client_interface), m_ban_db(std::move(ban_file)), m_default_ban_time(default_ban_time)
{
if (m_client_interface) m_client_interface->InitMessage(_("Loading banlist..."));
int64_t nStart = GetTimeMillis();
m_is_dirty = false;
banmap_t banmap;
if (m_ban_db.Read(banmap)) {
SetBanned(banmap); // thread save setter
SetBannedSetDirty(false); // no need to write down, just read data
SweepBanned(); // sweep out unused entries
LogPrint(BCLog::NET, "Loaded %d banned node ips/subnets from banlist.dat %dms\n",
banmap.size(), GetTimeMillis() - nStart);
} else {
LogPrintf("Invalid or missing banlist.dat; recreating\n");
SetBannedSetDirty(true); // force write
DumpBanlist();
}
}
BanMan::~BanMan()
{
DumpBanlist();
}
void BanMan::DumpBanlist()
{
SweepBanned(); // clean unused entries (if bantime has expired)
if (!BannedSetIsDirty()) return;
int64_t nStart = GetTimeMillis();
banmap_t banmap;
GetBanned(banmap);
if (m_ban_db.Write(banmap)) {
SetBannedSetDirty(false);
}
LogPrint(BCLog::NET, "Flushed %d banned node ips/subnets to banlist.dat %dms\n",
banmap.size(), GetTimeMillis() - nStart);
}
void BanMan::ClearBanned()
{
{
LOCK(m_cs_banned);
m_banned.clear();
m_is_dirty = true;
}
DumpBanlist(); //store banlist to disk
if (m_client_interface) m_client_interface->BannedListChanged();
}
bool BanMan::IsBanned(CNetAddr netAddr)
{
LOCK(m_cs_banned);
for (const auto& it : m_banned) {
CSubNet subNet = it.first;
CBanEntry banEntry = it.second;
if (subNet.Match(netAddr) && GetTime() < banEntry.nBanUntil) {
return true;
}
}
return false;
}
bool BanMan::IsBanned(CSubNet subNet)
{
LOCK(m_cs_banned);
banmap_t::iterator i = m_banned.find(subNet);
if (i != m_banned.end()) {
CBanEntry banEntry = (*i).second;
if (GetTime() < banEntry.nBanUntil) {
return true;
}
}
return false;
}
void BanMan::Ban(const CNetAddr& netAddr, const BanReason& banReason, int64_t bantimeoffset, bool sinceUnixEpoch)
{
CSubNet subNet(netAddr);
Ban(subNet, banReason, bantimeoffset, sinceUnixEpoch);
}
void BanMan::Ban(const CSubNet& subNet, const BanReason& banReason, int64_t bantimeoffset, bool sinceUnixEpoch)
{
CBanEntry banEntry(GetTime(), banReason);
int64_t normalized_bantimeoffset = bantimeoffset;
bool normalized_sinceUnixEpoch = sinceUnixEpoch;
if (bantimeoffset <= 0) {
normalized_bantimeoffset = m_default_ban_time;
normalized_sinceUnixEpoch = false;
}
banEntry.nBanUntil = (normalized_sinceUnixEpoch ? 0 : GetTime()) + normalized_bantimeoffset;
{
LOCK(m_cs_banned);
if (m_banned[subNet].nBanUntil < banEntry.nBanUntil) {
m_banned[subNet] = banEntry;
m_is_dirty = true;
} else
return;
}
if (m_client_interface) m_client_interface->BannedListChanged();
//store banlist to disk immediately if user requested ban
if (banReason == BanReasonManuallyAdded) DumpBanlist();
}
bool BanMan::Unban(const CNetAddr& netAddr)
{
CSubNet subNet(netAddr);
return Unban(subNet);
}
bool BanMan::Unban(const CSubNet& subNet)
{
{
LOCK(m_cs_banned);
if (m_banned.erase(subNet) == 0) return false;
m_is_dirty = true;
}
if (m_client_interface) m_client_interface->BannedListChanged();
DumpBanlist(); //store banlist to disk immediately
return true;
}
void BanMan::GetBanned(banmap_t& banMap)
{
LOCK(m_cs_banned);
// Sweep the banlist so expired bans are not returned
SweepBanned();
banMap = m_banned; //create a thread safe copy
}
void BanMan::SetBanned(const banmap_t& banMap)
{
LOCK(m_cs_banned);
m_banned = banMap;
m_is_dirty = true;
}
void BanMan::SweepBanned()
{
int64_t now = GetTime();
bool notifyUI = false;
{
LOCK(m_cs_banned);
banmap_t::iterator it = m_banned.begin();
while (it != m_banned.end()) {
CSubNet subNet = (*it).first;
CBanEntry banEntry = (*it).second;
if (now > banEntry.nBanUntil) {
m_banned.erase(it++);
m_is_dirty = true;
notifyUI = true;
LogPrint(BCLog::NET, "%s: Removed banned node ip/subnet from banlist.dat: %s\n", __func__, subNet.ToString());
} else
++it;
}
}
// update UI
if (notifyUI && m_client_interface) {
m_client_interface->BannedListChanged();
}
}
bool BanMan::BannedSetIsDirty()
{
LOCK(m_cs_banned);
return m_is_dirty;
}
void BanMan::SetBannedSetDirty(bool dirty)
{
LOCK(m_cs_banned); //reuse m_banned lock for the m_is_dirty flag
m_is_dirty = dirty;
}
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