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#include <math.h>
#include "netban.h"
bool CNetBan::StrAllnum(const char *pStr)
{
while(*pStr)
{
if(!(*pStr >= '0' && *pStr <= '9'))
return false;
pStr++;
}
return true;
}
CNetBan::CNetHash::CNetHash(const NETADDR *pAddr)
{
if(pAddr->type==NETTYPE_IPV4)
m_Hash = (pAddr->ip[0]+pAddr->ip[1]+pAddr->ip[2]+pAddr->ip[3])&0xFF;
else
m_Hash = (pAddr->ip[0]+pAddr->ip[1]+pAddr->ip[2]+pAddr->ip[3]+pAddr->ip[4]+pAddr->ip[5]+pAddr->ip[6]+pAddr->ip[7]+
pAddr->ip[8]+pAddr->ip[9]+pAddr->ip[10]+pAddr->ip[11]+pAddr->ip[12]+pAddr->ip[13]+pAddr->ip[14]+pAddr->ip[15])&0xFF;
m_HashIndex = 0;
}
CNetBan::CNetHash::CNetHash(const CNetRange *pRange)
{
m_Hash = 0;
m_HashIndex = 0;
for(int i = 0; pRange->m_LB.ip[i] == pRange->m_UB.ip[i]; ++i)
{
m_Hash += pRange->m_LB.ip[i];
++m_HashIndex;
}
m_Hash &= 0xFF;
}
int CNetBan::CNetHash::MakeHashArray(const NETADDR *pAddr, CNetHash aHash[17])
{
int Length = pAddr->type==NETTYPE_IPV4 ? 4 : 16;
aHash[0].m_Hash = 0;
aHash[0].m_HashIndex = 0;
for(int i = 1, Sum = 0; i <= Length; ++i)
{
Sum += pAddr->ip[i-1];
aHash[i].m_Hash = Sum&0xFF;
aHash[i].m_HashIndex = i%Length;
}
return Length;
}
template<class T, int HashCount>
typename CNetBan::CBan<T> *CNetBan::CBanPool<T, HashCount>::Add(const T *pData, const CBanInfo *pInfo, const CNetHash *pNetHash)
{
if(!m_pFirstFree)
return 0;
// create new ban
CBan<T> *pBan = m_pFirstFree;
pBan->m_Data = *pData;
pBan->m_Info = *pInfo;
pBan->m_NetHash = *pNetHash;
if(pBan->m_pNext)
pBan->m_pNext->m_pPrev = pBan->m_pPrev;
if(pBan->m_pPrev)
pBan->m_pPrev->m_pNext = pBan->m_pNext;
else
m_pFirstFree = pBan->m_pNext;
// add it to the hash list
if(m_paaHashList[pNetHash->m_HashIndex][pNetHash->m_Hash])
m_paaHashList[pNetHash->m_HashIndex][pNetHash->m_Hash]->m_pHashPrev = pBan;
pBan->m_pHashPrev = 0;
pBan->m_pHashNext = m_paaHashList[pNetHash->m_HashIndex][pNetHash->m_Hash];
m_paaHashList[pNetHash->m_HashIndex][pNetHash->m_Hash] = pBan;
// insert it into the used list
if(m_pFirstUsed)
{
for(CBan<T> *p = m_pFirstUsed; ; p = p->m_pNext)
{
if(p->m_Info.m_Expires == CBanInfo::EXPIRES_NEVER || (pInfo->m_Expires != CBanInfo::EXPIRES_NEVER && pInfo->m_Expires <= p->m_Info.m_Expires))
{
// insert before
pBan->m_pNext = p;
pBan->m_pPrev = p->m_pPrev;
if(p->m_pPrev)
p->m_pPrev->m_pNext = pBan;
else
m_pFirstUsed = pBan;
p->m_pPrev = pBan;
break;
}
if(!p->m_pNext)
{
// last entry
p->m_pNext = pBan;
pBan->m_pPrev = p;
pBan->m_pNext = 0;
break;
}
}
}
else
{
m_pFirstUsed = pBan;
pBan->m_pNext = pBan->m_pPrev = 0;
}
// update ban count
++m_CountUsed;
return pBan;
}
template<class T, int HashCount>
int CNetBan::CBanPool<T, HashCount>::Remove(CBan<T> *pBan)
{
if(pBan == 0)
return -1;
// remove from hash list
if(pBan->m_pHashNext)
pBan->m_pHashNext->m_pHashPrev = pBan->m_pHashPrev;
if(pBan->m_pHashPrev)
pBan->m_pHashPrev->m_pHashNext = pBan->m_pHashNext;
else
m_paaHashList[pBan->m_NetHash.m_HashIndex][pBan->m_NetHash.m_Hash] = pBan->m_pHashNext;
pBan->m_pHashNext = pBan->m_pHashPrev = 0;
// remove from used list
if(pBan->m_pNext)
pBan->m_pNext->m_pPrev = pBan->m_pPrev;
if(pBan->m_pPrev)
pBan->m_pPrev->m_pNext = pBan->m_pNext;
else
m_pFirstUsed = pBan->m_pNext;
// add to recycle list
if(m_pFirstFree)
m_pFirstFree->m_pPrev = pBan;
pBan->m_pPrev = 0;
pBan->m_pNext = m_pFirstFree;
m_pFirstFree = pBan;
// update ban count
--m_CountUsed;
return 0;
}
template<class T, int HashCount>
void CNetBan::CBanPool<T, HashCount>::Update(CBan<CDataType> *pBan, const CBanInfo *pInfo)
{
pBan->m_Info = *pInfo;
// remove from used list
if(pBan->m_pNext)
pBan->m_pNext->m_pPrev = pBan->m_pPrev;
if(pBan->m_pPrev)
pBan->m_pPrev->m_pNext = pBan->m_pNext;
else
m_pFirstUsed = pBan->m_pNext;
// insert it into the used list
if(m_pFirstUsed)
{
for(CBan<T> *p = m_pFirstUsed; ; p = p->m_pNext)
{
if(p->m_Info.m_Expires == CBanInfo::EXPIRES_NEVER || (pInfo->m_Expires != CBanInfo::EXPIRES_NEVER && pInfo->m_Expires <= p->m_Info.m_Expires))
{
// insert before
pBan->m_pNext = p;
pBan->m_pPrev = p->m_pPrev;
if(p->m_pPrev)
p->m_pPrev->m_pNext = pBan;
else
m_pFirstUsed = pBan;
p->m_pPrev = pBan;
break;
}
if(!p->m_pNext)
{
// last entry
p->m_pNext = pBan;
pBan->m_pPrev = p;
pBan->m_pNext = 0;
break;
}
}
}
else
{
m_pFirstUsed = pBan;
pBan->m_pNext = pBan->m_pPrev = 0;
}
}
template<class T, int HashCount>
void CNetBan::CBanPool<T, HashCount>::Reset()
{
mem_zero(m_paaHashList, sizeof(m_paaHashList));
mem_zero(m_aBans, sizeof(m_aBans));
m_pFirstUsed = 0;
m_CountUsed = 0;
for(int i = 1; i < MAX_BANS-1; ++i)
{
m_aBans[i].m_pNext = &m_aBans[i+1];
m_aBans[i].m_pPrev = &m_aBans[i-1];
}
m_aBans[0].m_pNext = &m_aBans[1];
m_aBans[MAX_BANS-1].m_pPrev = &m_aBans[MAX_BANS-2];
m_pFirstFree = &m_aBans[0];
}
template<class T, int HashCount>
typename CNetBan::CBan<T> *CNetBan::CBanPool<T, HashCount>::Get(int Index) const
{
if(Index < 0 || Index >= Num())
return 0;
for(CNetBan::CBan<T> *pBan = m_pFirstUsed; pBan; pBan = pBan->m_pNext, --Index)
{
if(Index == 0)
return pBan;
}
return 0;
}
template<class T>
void CNetBan::MakeBanInfo(const CBan<T> *pBan, char *pBuf, unsigned BuffSize, int Type) const
{
if(pBan == 0 || pBuf == 0)
{
if(BuffSize > 0)
pBuf[0] = 0;
return;
}
// build type based part
char aBuf[256];
if(Type == MSGTYPE_PLAYER)
str_copy(aBuf, "You have been banned", sizeof(aBuf));
else
{
char aTemp[256];
switch(Type)
{
case MSGTYPE_LIST:
str_format(aBuf, sizeof(aBuf), "%s banned", NetToString(&pBan->m_Data, aTemp, sizeof(aTemp))); break;
case MSGTYPE_BANADD:
str_format(aBuf, sizeof(aBuf), "banned %s", NetToString(&pBan->m_Data, aTemp, sizeof(aTemp))); break;
case MSGTYPE_BANREM:
str_format(aBuf, sizeof(aBuf), "unbanned %s", NetToString(&pBan->m_Data, aTemp, sizeof(aTemp))); break;
default:
aBuf[0] = 0;
}
}
// add info part
if(pBan->m_Info.m_Expires != CBanInfo::EXPIRES_NEVER)
{
int Mins = ((pBan->m_Info.m_Expires-time_timestamp()) + 59) / 60;
if(Mins <= 1)
str_format(pBuf, BuffSize, "%s for 1 minute (%s)", aBuf, pBan->m_Info.m_aReason);
else
str_format(pBuf, BuffSize, "%s for %d minutes (%s)", aBuf, Mins, pBan->m_Info.m_aReason);
}
else
str_format(pBuf, BuffSize, "%s for life (%s)", aBuf, pBan->m_Info.m_aReason);
}
template<class T>
int CNetBan::Ban(T *pBanPool, const typename T::CDataType *pData, int Seconds, const char *pReason)
{
// do not ban localhost
if(NetMatch(pData, &m_LocalhostIPV4) || NetMatch(pData, &m_LocalhostIPV6))
{
dbg_msg("net_ban", "ban failed (localhost)");
return -1;
}
int Stamp = Seconds > 0 ? time_timestamp()+Seconds : CBanInfo::EXPIRES_NEVER;
// set up info
CBanInfo Info = {0};
Info.m_Expires = Stamp;
str_copy(Info.m_aReason, pReason, sizeof(Info.m_aReason));
// check if it already exists
CNetHash NetHash(pData);
CBan<typename T::CDataType> *pBan = pBanPool->Find(pData, &NetHash);
if(pBan)
{
// adjust the ban
pBanPool->Update(pBan, &Info);
char aBuf[128];
MakeBanInfo(pBan, aBuf, sizeof(aBuf), MSGTYPE_LIST);
dbg_msg("net_ban", aBuf);
return 1;
}
// add ban and print result
pBan = pBanPool->Add(pData, &Info, &NetHash);
if(pBan)
{
char aBuf[128];
MakeBanInfo(pBan, aBuf, sizeof(aBuf), MSGTYPE_BANADD);
dbg_msg("net_ban", aBuf);
return 0;
}
else
dbg_msg("net_ban", "ban failed (full banlist)");
return -1;
}
template<class T>
int CNetBan::Unban(T *pBanPool, const typename T::CDataType *pData)
{
CNetHash NetHash(pData);
CBan<typename T::CDataType> *pBan = pBanPool->Find(pData, &NetHash);
if(pBan)
{
char aBuf[256];
MakeBanInfo(pBan, aBuf, sizeof(aBuf), MSGTYPE_BANREM);
pBanPool->Remove(pBan);
dbg_msg("net_ban", aBuf);
return 0;
}
else
dbg_msg("net_ban", "unban failed (invalid entry)");
return -1;
}
void CNetBan::Init()
{
m_BanAddrPool.Reset();
m_BanRangePool.Reset();
net_host_lookup("localhost", &m_LocalhostIPV4, NETTYPE_IPV4);
net_host_lookup("localhost", &m_LocalhostIPV6, NETTYPE_IPV6);
}
void CNetBan::Update()
{
int Now = time_timestamp();
// remove expired bans
char aBuf[256], aNetStr[256];
while(m_BanAddrPool.First() && m_BanAddrPool.First()->m_Info.m_Expires != CBanInfo::EXPIRES_NEVER && m_BanAddrPool.First()->m_Info.m_Expires < Now)
{
str_format(aBuf, sizeof(aBuf), "ban %s expired", NetToString(&m_BanAddrPool.First()->m_Data, aNetStr, sizeof(aNetStr)));
dbg_msg("net_ban", aBuf);
m_BanAddrPool.Remove(m_BanAddrPool.First());
}
while(m_BanRangePool.First() && m_BanRangePool.First()->m_Info.m_Expires != CBanInfo::EXPIRES_NEVER && m_BanRangePool.First()->m_Info.m_Expires < Now)
{
str_format(aBuf, sizeof(aBuf), "ban %s expired", NetToString(&m_BanRangePool.First()->m_Data, aNetStr, sizeof(aNetStr)));
dbg_msg("net_ban", aBuf);
m_BanRangePool.Remove(m_BanRangePool.First());
}
}
int CNetBan::BanAddr(const NETADDR *pAddr, int Seconds, const char *pReason)
{
return Ban(&m_BanAddrPool, pAddr, Seconds, pReason);
}
int CNetBan::BanRange(const CNetRange *pRange, int Seconds, const char *pReason)
{
if(pRange->IsValid())
return Ban(&m_BanRangePool, pRange, Seconds, pReason);
dbg_msg("net_ban", "ban failed (invalid range)");
return -1;
}
int CNetBan::UnbanByAddr(const NETADDR *pAddr)
{
return Unban(&m_BanAddrPool, pAddr);
}
int CNetBan::UnbanByRange(const CNetRange *pRange)
{
if(pRange->IsValid())
return Unban(&m_BanRangePool, pRange);
dbg_msg("net_ban", "ban failed (invalid range)");
return -1;
}
int CNetBan::UnbanByIndex(int Index)
{
int Result;
char aBuf[256];
CBanAddr *pBan = m_BanAddrPool.Get(Index);
if(pBan)
{
NetToString(&pBan->m_Data, aBuf, sizeof(aBuf));
Result = m_BanAddrPool.Remove(pBan);
}
else
{
CBanRange *pBan = m_BanRangePool.Get(Index-m_BanAddrPool.Num());
if(pBan)
{
NetToString(&pBan->m_Data, aBuf, sizeof(aBuf));
Result = m_BanRangePool.Remove(pBan);
}
else
{
dbg_msg("net_ban", "unban failed (invalid index)");
return -1;
}
}
char aMsg[256];
str_format(aMsg, sizeof(aMsg), "unbanned index %i (%s)", Index, aBuf);
dbg_msg("net_ban", aMsg);
return Result;
}
void CNetBan::UnbanAll()
{
m_BanAddrPool.Reset();
m_BanRangePool.Reset();
}
bool CNetBan::IsBanned(const NETADDR *pAddr, char *pBuf, unsigned BufferSize) const
{
CNetHash aHash[17];
int Length = CNetHash::MakeHashArray(pAddr, aHash);
// check ban adresses
CBanAddr *pBan = m_BanAddrPool.Find(pAddr, &aHash[Length]);
if(pBan)
{
MakeBanInfo(pBan, pBuf, BufferSize, MSGTYPE_PLAYER);
return true;
}
// check ban ranges
for(int i = Length-1; i >= 0; --i)
{
for(CBanRange *pBan = m_BanRangePool.First(&aHash[i]); pBan; pBan = pBan->m_pHashNext)
{
if(NetMatch(&pBan->m_Data, pAddr, i, Length))
{
MakeBanInfo(pBan, pBuf, BufferSize, MSGTYPE_PLAYER);
return true;
}
}
}
return false;
}
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