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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 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 <common/system.h>
#include <logging.h>
#include <netaddress.h>
#include <node/interface_ui.h>
#include <sync.h>
#include <util/time.h>
#include <util/translation.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)
{
LoadBanlist();
DumpBanlist();
}
BanMan::~BanMan()
{
DumpBanlist();
}
void BanMan::LoadBanlist()
{
LOCK(m_banned_mutex);
if (m_client_interface) m_client_interface->InitMessage(_("Loading banlist…").translated);
const auto start{SteadyClock::now()};
if (m_ban_db.Read(m_banned)) {
SweepBanned(); // sweep out unused entries
LogPrint(BCLog::NET, "Loaded %d banned node addresses/subnets %dms\n", m_banned.size(),
Ticks<std::chrono::milliseconds>(SteadyClock::now() - start));
} else {
LogPrintf("Recreating the banlist database\n");
m_banned = {};
m_is_dirty = true;
}
}
void BanMan::DumpBanlist()
{
static Mutex dump_mutex;
LOCK(dump_mutex);
banmap_t banmap;
{
LOCK(m_banned_mutex);
SweepBanned();
if (!m_is_dirty) return;
banmap = m_banned;
m_is_dirty = false;
}
const auto start{SteadyClock::now()};
if (!m_ban_db.Write(banmap)) {
LOCK(m_banned_mutex);
m_is_dirty = true;
}
LogPrint(BCLog::NET, "Flushed %d banned node addresses/subnets to disk %dms\n", banmap.size(),
Ticks<std::chrono::milliseconds>(SteadyClock::now() - start));
}
void BanMan::ClearBanned()
{
{
LOCK(m_banned_mutex);
m_banned.clear();
m_is_dirty = true;
}
DumpBanlist(); //store banlist to disk
if (m_client_interface) m_client_interface->BannedListChanged();
}
bool BanMan::IsDiscouraged(const CNetAddr& net_addr)
{
LOCK(m_banned_mutex);
return m_discouraged.contains(net_addr.GetAddrBytes());
}
bool BanMan::IsBanned(const CNetAddr& net_addr)
{
auto current_time = GetTime();
LOCK(m_banned_mutex);
for (const auto& it : m_banned) {
CSubNet sub_net = it.first;
CBanEntry ban_entry = it.second;
if (current_time < ban_entry.nBanUntil && sub_net.Match(net_addr)) {
return true;
}
}
return false;
}
bool BanMan::IsBanned(const CSubNet& sub_net)
{
auto current_time = GetTime();
LOCK(m_banned_mutex);
banmap_t::iterator i = m_banned.find(sub_net);
if (i != m_banned.end()) {
CBanEntry ban_entry = (*i).second;
if (current_time < ban_entry.nBanUntil) {
return true;
}
}
return false;
}
void BanMan::Ban(const CNetAddr& net_addr, int64_t ban_time_offset, bool since_unix_epoch)
{
CSubNet sub_net(net_addr);
Ban(sub_net, ban_time_offset, since_unix_epoch);
}
void BanMan::Discourage(const CNetAddr& net_addr)
{
LOCK(m_banned_mutex);
m_discouraged.insert(net_addr.GetAddrBytes());
}
void BanMan::Ban(const CSubNet& sub_net, int64_t ban_time_offset, bool since_unix_epoch)
{
CBanEntry ban_entry(GetTime());
int64_t normalized_ban_time_offset = ban_time_offset;
bool normalized_since_unix_epoch = since_unix_epoch;
if (ban_time_offset <= 0) {
normalized_ban_time_offset = m_default_ban_time;
normalized_since_unix_epoch = false;
}
ban_entry.nBanUntil = (normalized_since_unix_epoch ? 0 : GetTime()) + normalized_ban_time_offset;
{
LOCK(m_banned_mutex);
if (m_banned[sub_net].nBanUntil < ban_entry.nBanUntil) {
m_banned[sub_net] = ban_entry;
m_is_dirty = true;
} else
return;
}
if (m_client_interface) m_client_interface->BannedListChanged();
//store banlist to disk immediately
DumpBanlist();
}
bool BanMan::Unban(const CNetAddr& net_addr)
{
CSubNet sub_net(net_addr);
return Unban(sub_net);
}
bool BanMan::Unban(const CSubNet& sub_net)
{
{
LOCK(m_banned_mutex);
if (m_banned.erase(sub_net) == 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_banned_mutex);
// Sweep the banlist so expired bans are not returned
SweepBanned();
banmap = m_banned; //create a thread safe copy
}
void BanMan::SweepBanned()
{
AssertLockHeld(m_banned_mutex);
int64_t now = GetTime();
bool notify_ui = false;
banmap_t::iterator it = m_banned.begin();
while (it != m_banned.end()) {
CSubNet sub_net = (*it).first;
CBanEntry ban_entry = (*it).second;
if (!sub_net.IsValid() || now > ban_entry.nBanUntil) {
m_banned.erase(it++);
m_is_dirty = true;
notify_ui = true;
LogPrint(BCLog::NET, "Removed banned node address/subnet: %s\n", sub_net.ToString());
} else {
++it;
}
}
// update UI
if (notify_ui && m_client_interface) {
m_client_interface->BannedListChanged();
}
}
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