server/game/src/ip_ban.cpp

//#define __MAIN__
#ifdef __MAIN__

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <vector>
#include <algorithm>

typedef unsigned char BYTE;
typedef unsigned long DWORD;

#else

#include "stdafx.h"
#include "ip_ban.h"

#endif

class IP
{
	public:
		IP()
			: dwStart(0), dwEnd(0), dwMask(0)
		{}

		IP(const IP & r)
		{
			dwStart = r.dwStart;
			dwEnd = r.dwEnd;
			dwMask = r.dwMask;
		}

		IP(const char * c_pszStart, const char * c_pszEnd = NULL)
		{
			BYTE start[4];
			BYTE end[4];
			BYTE mask[4];

			Read(c_pszStart, start);

			if (c_pszEnd && *c_pszEnd)
				Read(c_pszEnd, end);
			else
				memcpy(end, start, sizeof(BYTE) * 4);

			mask[0] = 255 - (start[0] ^ end[0]);
			mask[1] = 255 - (start[1] ^ end[1]);
			mask[2] = 255 - (start[2] ^ end[2]);
			mask[3] = 255 - (start[3] ^ end[3]);

			dwStart = (start[3] << 24) | (start[2] << 16) | (start[1] << 8) | start[0];
			dwEnd = (end[3] << 24) | (end[2] << 16) | (end[1] << 8) | end[0];
			dwMask = (mask[3] << 24) | (mask[2] << 16) | (mask[1] << 8) | mask[0];

			Print();
		}

		IP(struct in_addr in)
		{
			dwStart = in.s_addr;
			dwEnd = dwStart;
			dwMask = 4294967295UL;
		}

		bool IsEqual(const IP & r) const
		{
			return (dwStart == r.dwStart && dwEnd == r.dwEnd && dwMask == r.dwMask);
		}

		bool IsChildOf(IP & r)
		{
			if ((r.dwStart & r.dwMask) != (dwStart & r.dwMask))
				return false;

			DWORD m = r.dwMask | dwMask;

			return (dwStart & ~m) == (dwStart & ~dwMask) && (dwEnd & ~m) == (dwEnd & ~dwMask);
		}

		int hash()
		{
			return (dwStart & 0x000000FF);
		}

		void Print()
		{
			struct in_addr in_ip, in_mask, in_end;

			in_ip.s_addr = dwStart;
			in_mask.s_addr = dwMask;
			in_end.s_addr = dwEnd;

			fprintf(stderr, "\t%s", inet_ntoa(in_ip));
			fprintf(stderr, "\t%s", inet_ntoa(in_end));
			fprintf(stderr, "\t%s\tfirst %d\n", inet_ntoa(in_mask), hash());
		}

	protected:
		bool Read(const char * s, BYTE * dest)
		{
			BYTE bClass = 0;
			const char * p = s;

			while (bClass < 3)
			{
				char szNum[4];
				char * pDot = const_cast<char*>(strchr(p, '.'));

				if (!pDot)
					break;

				strncpy(szNum, p, sizeof(szNum));

				str_to_number(dest[bClass++], szNum);
				p = pDot + 1;
			}

			if (bClass != 3)
			{
				fprintf(stderr, "error reading start %s\n", s);
				return false;
			}

			str_to_number(dest[bClass], p);
			return true;
		}

		DWORD dwStart;
		DWORD dwEnd;
		DWORD dwMask;
};

std::map<int, std::vector<IP> > mapBanIP;

bool LoadBanIP(const char * filename)
{
	FILE * fp = fopen(filename, "r");

	if (!fp)
		return false;

	char buf[256];
	char start[256];
	char end[256];

	fprintf(stderr, "LOADING BANNED IP LIST\n");

	while (fgets(buf, 256, fp))
	{
		*strchr(buf, '\n') = '\0';
		char * p = strchr(buf, '\t');

		if (!p)
		{
			strncpy(start, buf, sizeof(start));
			*end = '\0';
		}
		else
		{
			char * p2 = strchr(p + 1, '\t');

			if (p2)
				*p2 = '\0';

			strncpy(end, p + 1, sizeof(end));

			*p = '\0';
			strncpy(start, buf, sizeof(start));
		}

		IP ip(start, end);

		itertype(mapBanIP) it = mapBanIP.find(ip.hash());

		if (it == mapBanIP.end())
		{
			std::vector<IP> v;
			v.push_back(ip);
			mapBanIP.insert(std::map<DWORD, std::vector<IP> >::value_type(ip.hash(), v));
		}
		else
			it->second.push_back(ip);
	}

	fclose(fp);

	return true;
}

bool IsBanIP(struct in_addr in)
{
	IP ip(in);

	itertype(mapBanIP) it = mapBanIP.find(ip.hash());

	if (it == mapBanIP.end())
		return false;

	itertype(it->second) it2 = it->second.begin();

	while (it2 != it->second.end())
		if (ip.IsChildOf(*(it2++)))
			return true;

	return false;
}

#ifdef __MAIN__
void UniqueIP(std::vector<IP> & v)
{
	using namespace std;

	bool found;
	vector<IP>::iterator it1;

	do
	{
		vector<IP> o;
		it1 = v.begin();

		while (it1 != v.end())
		{
			IP & ip1 = *(it1++);

			found = false;

			if (it1 != v.end())
			{
				vector<IP>::iterator it2 = it1;

				while (it2 != v.end())
				{
					IP & ip2 = *(it2++);

					if (ip1.IsEqual(ip2))
					{
						found = true;
						break;
					}
				}
			}

			if (!found)
				o.push_back(ip1);
		}

		if (o.size() == v.size())
			break;

		v.clear();
		it1 = o.begin();

		while (it1 != o.end())
			v.push_back(*(it1++));
	}
	while (1);
}

void FilterIP(std::vector<IP> & v)
{
	using namespace std;

	bool found;
	vector<IP>::iterator it1;

	do
	{
		vector<IP> o;
		it1 = v.begin();

		while (it1 != v.end())
		{
			IP & ip1 = *(it1++);

			found = false;

			vector<IP>::iterator it2 = v.begin();

			while (it2 != v.end())
			{
				IP & ip2 = *(it2++);

				if (ip1.IsEqual(ip2))
					continue;

				if (ip1.IsChildOf(ip2))
				{
					found = true;
					break;
				}
			}

			if (!found)
				o.push_back(ip1);
		}

		if (o.size() == v.size())
			break;

		v.clear();
		it1 = o.begin();

		while (it1 != o.end())
			v.push_back(*(it1++));
	}
	while (1);
}

int main(int argc, char **argv)
{
	using namespace std;

	if (argc != 2)
	{
		printf("Syntax: %s <filename>\n", *argv);
		return 1;
	}

	argc--, argv++;

	FILE * fp = fopen(*argv, "r");

	if (!fp)
		return 0;

	vector<IP> v;
	char buf[256];
	char start[32];
	char end[32];

	while (fgets(buf, 256, fp))
	{
		*strchr(buf, '\n') = '\0';
		char * p = strchr(buf, '\t');

		if (!p)
		{
			strncpy(start, buf, sizeof(start));
			*end = '\0';
		}
		else
		{
			strncpy(end, p + 1, sizeof(end));
			*p = '\0';
			strncpy(start, buf, sizeof(start));
		}

		v.push_back(IP(start, end));
	}

	fclose(fp);

	printf("size %d\n", v.size());
	UniqueIP(v);
	printf("result1 %d\n", v.size());
	FilterIP(v);
	printf("result2 %d\n", v.size());

	vector<IP>::iterator it = v.begin();

	while (it != v.end())
		(*(it++)).Print();

	return 1;
}

#endif