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|
// Copyright (c) Athena Dev Teams - Licensed under GNU GPL
// For more information, see LICENCE in the main folder
#include "../common/cbasetypes.h"
#include "../common/mmo.h"
#include "../common/timer.h"
#include "../common/malloc.h"
#include "../common/showmsg.h"
#include "../common/strlib.h"
#include "socket.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#ifdef WIN32
#include <winsock2.h>
#include <io.h>
#else
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <net/if.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <arpa/inet.h>
#ifndef SIOCGIFCONF
#include <sys/sockio.h> // SIOCGIFCONF on Solaris, maybe others? [Shinomori]
#endif
#ifndef FIONBIO
#include <sys/filio.h> // FIONBIO on Solaris [FlavioJS]
#endif
#ifdef HAVE_SETRLIMIT
#include <sys/resource.h>
#endif
#endif
/////////////////////////////////////////////////////////////////////
#if defined(WIN32)
/////////////////////////////////////////////////////////////////////
// windows portability layer
typedef int socklen_t;
#define sErrno WSAGetLastError()
#define S_ENOTSOCK WSAENOTSOCK
#define S_EWOULDBLOCK WSAEWOULDBLOCK
#define S_EINTR WSAEINTR
#define S_ECONNABORTED WSAECONNABORTED
#define SHUT_RD SD_RECEIVE
#define SHUT_WR SD_SEND
#define SHUT_RDWR SD_BOTH
// global array of sockets (emulating linux)
// fd is the position in the array
static SOCKET sock_arr[FD_SETSIZE];
static int sock_arr_len = 0;
/// Returns the socket associated with the target fd.
///
/// @param fd Target fd.
/// @return Socket
#define fd2sock(fd) sock_arr[fd]
/// Returns the first fd associated with the socket.
/// Returns -1 if the socket is not found.
///
/// @param s Socket
/// @return Fd or -1
int sock2fd(SOCKET s)
{
int fd;
// search for the socket
for( fd = 1; fd < sock_arr_len; ++fd )
if( sock_arr[fd] == s )
break;// found the socket
if( fd == sock_arr_len )
return -1;// not found
return fd;
}
/// Inserts the socket into the global array of sockets.
/// Returns a new fd associated with the socket.
/// If there are too many sockets it closes the socket, sets an error and
// returns -1 instead.
/// Since fd 0 is reserved, it returns values in the range [1,FD_SETSIZE[.
///
/// @param s Socket
/// @return New fd or -1
int sock2newfd(SOCKET s)
{
int fd;
// find an empty position
for( fd = 1; fd < sock_arr_len; ++fd )
if( sock_arr[fd] == INVALID_SOCKET )
break;// empty position
if( fd == ARRAYLENGTH(sock_arr) )
{// too many sockets
closesocket(s);
WSASetLastError(WSAEMFILE);
return -1;
}
sock_arr[fd] = s;
if( sock_arr_len <= fd )
sock_arr_len = fd+1;
return fd;
}
int sAccept(int fd, struct sockaddr* addr, int* addrlen)
{
SOCKET s;
// accept connection
s = accept(fd2sock(fd), addr, addrlen);
if( s == INVALID_SOCKET )
return -1;// error
return sock2newfd(s);
}
int sClose(int fd)
{
int ret = closesocket(fd2sock(fd));
fd2sock(fd) = INVALID_SOCKET;
return ret;
}
int sSocket(int af, int type, int protocol)
{
SOCKET s;
// create socket
s = socket(af,type,protocol);
if( s == INVALID_SOCKET )
return -1;// error
return sock2newfd(s);
}
#define sBind(fd,name,namelen) bind(fd2sock(fd),name,namelen)
#define sConnect(fd,name,namelen) connect(fd2sock(fd),name,namelen)
#define sIoctl(fd,cmd,argp) ioctlsocket(fd2sock(fd),cmd,argp)
#define sListen(fd,backlog) listen(fd2sock(fd),backlog)
#define sRecv(fd,buf,len,flags) recv(fd2sock(fd),buf,len,flags)
#define sSelect select
#define sSend(fd,buf,len,flags) send(fd2sock(fd),buf,len,flags)
#define sSetsockopt(fd,level,optname,optval,optlen) setsockopt(fd2sock(fd),level,optname,optval,optlen)
#define sShutdown(fd,how) shutdown(fd2sock(fd),how)
#define sFD_SET(fd,set) FD_SET(fd2sock(fd),set)
#define sFD_CLR(fd,set) FD_CLR(fd2sock(fd),set)
#define sFD_ISSET(fd,set) FD_ISSET(fd2sock(fd),set)
#define sFD_ZERO FD_ZERO
/////////////////////////////////////////////////////////////////////
#else
/////////////////////////////////////////////////////////////////////
// nix portability layer
#define SOCKET_ERROR (-1)
#define sErrno errno
#define S_ENOTSOCK EBADF
#define S_EWOULDBLOCK EAGAIN
#define S_EINTR EINTR
#define S_ECONNABORTED ECONNABORTED
#define sAccept accept
#define sClose close
#define sSocket socket
#define sBind bind
#define sConnect connect
#define sIoctl ioctl
#define sListen listen
#define sRecv recv
#define sSelect select
#define sSend send
#define sSetsockopt setsockopt
#define sShutdown shutdown
#define sFD_SET FD_SET
#define sFD_CLR FD_CLR
#define sFD_ISSET FD_ISSET
#define sFD_ZERO FD_ZERO
/////////////////////////////////////////////////////////////////////
#endif
/////////////////////////////////////////////////////////////////////
fd_set readfds;
int fd_max;
time_t last_tick;
time_t stall_time = 60;
uint32 addr_[16]; // ip addresses of local host (host byte order)
int naddr_ = 0; // # of ip addresses
// Maximum packet size in bytes, which the client is able to handle.
// Larger packets cause a buffer overflow and stack corruption.
static size_t socket_max_client_packet = 20480;
// initial recv buffer size (this will also be the max. size)
// biggest known packet: S 0153 <len>.w <emblem data>.?B -> 24x24 256 color .bmp (0153 + len.w + 1618/1654/1756 bytes)
#define RFIFO_SIZE (2*1024)
// initial send buffer size (will be resized as needed)
#define WFIFO_SIZE (16*1024)
// Maximum size of pending data in the write fifo. (for non-server connections)
// The connection is closed if it goes over the limit.
#define WFIFO_MAX (1*1024*1024)
struct socket_data* session[FD_SETSIZE];
#ifdef SEND_SHORTLIST
int send_shortlist_array[FD_SETSIZE];// we only support FD_SETSIZE sockets, limit the array to that
int send_shortlist_count = 0;// how many fd's are in the shortlist
uint32 send_shortlist_set[(FD_SETSIZE+31)/32];// to know if specific fd's are already in the shortlist
#endif
static int create_session(int fd, RecvFunc func_recv, SendFunc func_send, ParseFunc func_parse);
#ifndef MINICORE
int ip_rules = 1;
static int connect_check(uint32 ip);
#endif
/*======================================
* CORE : Default processing functions
*--------------------------------------*/
int null_recv(int fd) { return 0; }
int null_send(int fd) { return 0; }
int null_parse(int fd) { return 0; }
ParseFunc default_func_parse = null_parse;
void set_defaultparse(ParseFunc defaultparse)
{
default_func_parse = defaultparse;
}
/*======================================
* CORE : Socket options
*--------------------------------------*/
void set_nonblocking(int fd, unsigned long yes)
{
// FIONBIO Use with a nonzero argp parameter to enable the nonblocking mode of socket s.
// The argp parameter is zero if nonblocking is to be disabled.
if( sIoctl(fd, FIONBIO, &yes) != 0 )
ShowError("set_nonblocking: Failed to set socket #%d to non-blocking mode (code %d) - Please report this!!!\n", fd, sErrno);
}
void setsocketopts(int fd)
{
int yes = 1; // reuse fix
#if !defined(WIN32)
// set SO_REAUSEADDR to true, unix only. on windows this option causes
// the previous owner of the socket to give up, which is not desirable
// in most cases, neither compatible with unix.
sSetsockopt(fd,SOL_SOCKET,SO_REUSEADDR,(char *)&yes,sizeof(yes));
#ifdef SO_REUSEPORT
sSetsockopt(fd,SOL_SOCKET,SO_REUSEPORT,(char *)&yes,sizeof(yes));
#endif
#endif
// Set the socket into no-delay mode; otherwise packets get delayed for up to 200ms, likely creating server-side lag.
// The RO protocol is mainly single-packet request/response, plus the FIFO model already does packet grouping anyway.
sSetsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&yes, sizeof(yes));
// force the socket into no-wait, graceful-close mode (should be the default, but better make sure)
//(http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winsock/winsock/closesocket_2.asp)
{
struct linger opt;
opt.l_onoff = 0; // SO_DONTLINGER
opt.l_linger = 0; // Do not care
if( sSetsockopt(fd, SOL_SOCKET, SO_LINGER, (char*)&opt, sizeof(opt)) )
ShowWarning("setsocketopts: Unable to set SO_LINGER mode for connection #%d!\n", fd);
}
}
/*======================================
* CORE : Socket Sub Function
*--------------------------------------*/
void set_eof(int fd)
{
if( session_isActive(fd) )
{
#ifdef SEND_SHORTLIST
// Add this socket to the shortlist for eof handling.
send_shortlist_add_fd(fd);
#endif
session[fd]->flag.eof = 1;
}
}
int recv_to_fifo(int fd)
{
int len;
if( !session_isActive(fd) )
return -1;
len = sRecv(fd, (char *) session[fd]->rdata + session[fd]->rdata_size, (int)RFIFOSPACE(fd), 0);
if( len == SOCKET_ERROR )
{//An exception has occured
if( sErrno != S_EWOULDBLOCK ) {
//ShowDebug("recv_to_fifo: code %d, closing connection #%d\n", sErrno, fd);
set_eof(fd);
}
return 0;
}
if( len == 0 )
{//Normal connection end.
set_eof(fd);
return 0;
}
session[fd]->rdata_size += len;
session[fd]->rdata_tick = last_tick;
return 0;
}
int send_from_fifo(int fd)
{
int len;
if( !session_isValid(fd) )
return -1;
if( session[fd]->wdata_size == 0 )
return 0; // nothing to send
len = sSend(fd, (const char *) session[fd]->wdata, (int)session[fd]->wdata_size, 0);
if( len == SOCKET_ERROR )
{//An exception has occured
if( sErrno != S_EWOULDBLOCK ) {
//ShowDebug("send_from_fifo: error %d, ending connection #%d\n", sErrno, fd);
session[fd]->wdata_size = 0; //Clear the send queue as we can't send anymore. [Skotlex]
set_eof(fd);
}
return 0;
}
if( len > 0 )
{
// some data could not be transferred?
// shift unsent data to the beginning of the queue
if( (size_t)len < session[fd]->wdata_size )
memmove(session[fd]->wdata, session[fd]->wdata + len, session[fd]->wdata_size - len);
session[fd]->wdata_size -= len;
}
return 0;
}
/// Best effort - there's no warranty that the data will be sent.
void flush_fifo(int fd)
{
if(session[fd] != NULL)
session[fd]->func_send(fd);
}
void flush_fifos(void)
{
int i;
for(i = 1; i < fd_max; i++)
flush_fifo(i);
}
/*======================================
* CORE : Connection functions
*--------------------------------------*/
int connect_client(int listen_fd)
{
int fd;
struct sockaddr_in client_address;
socklen_t len;
len = sizeof(client_address);
fd = sAccept(listen_fd, (struct sockaddr*)&client_address, &len);
if ( fd == -1 ) {
ShowError("connect_client: accept failed (code %d)!\n", sErrno);
return -1;
}
if( fd == 0 )
{// reserved
ShowError("connect_client: Socket #0 is reserved - Please report this!!!\n");
sClose(fd);
return -1;
}
if( fd >= FD_SETSIZE )
{// socket number too big
ShowError("connect_client: New socket #%d is greater than can we handle! Increase the value of FD_SETSIZE (currently %d) for your OS to fix this!\n", fd, FD_SETSIZE);
sClose(fd);
return -1;
}
setsocketopts(fd);
set_nonblocking(fd, 1);
#ifndef MINICORE
if( ip_rules && !connect_check(ntohl(client_address.sin_addr.s_addr)) ) {
do_close(fd);
return -1;
}
#endif
if( fd_max <= fd ) fd_max = fd + 1;
sFD_SET(fd,&readfds);
create_session(fd, recv_to_fifo, send_from_fifo, default_func_parse);
session[fd]->client_addr = ntohl(client_address.sin_addr.s_addr);
return fd;
}
int make_listen_bind(uint32 ip, uint16 port)
{
struct sockaddr_in server_address;
int fd;
int result;
fd = sSocket(AF_INET, SOCK_STREAM, 0);
if( fd == -1 )
{
ShowError("make_listen_bind: socket creation failed (code %d)!\n", sErrno);
exit(EXIT_FAILURE);
}
if( fd == 0 )
{// reserved
ShowError("make_listen_bind: Socket #0 is reserved - Please report this!!!\n");
sClose(fd);
return -1;
}
if( fd >= FD_SETSIZE )
{// socket number too big
ShowError("make_listen_bind: New socket #%d is greater than can we handle! Increase the value of FD_SETSIZE (currently %d) for your OS to fix this!\n", fd, FD_SETSIZE);
sClose(fd);
return -1;
}
setsocketopts(fd);
set_nonblocking(fd, 1);
server_address.sin_family = AF_INET;
server_address.sin_addr.s_addr = htonl(ip);
server_address.sin_port = htons(port);
result = sBind(fd, (struct sockaddr*)&server_address, sizeof(server_address));
if( result == SOCKET_ERROR ) {
ShowError("make_listen_bind: bind failed (socket #%d, code %d)!\n", fd, sErrno);
exit(EXIT_FAILURE);
}
result = sListen(fd,5);
if( result == SOCKET_ERROR ) {
ShowError("make_listen_bind: listen failed (socket #%d, code %d)!\n", fd, sErrno);
exit(EXIT_FAILURE);
}
if(fd_max <= fd) fd_max = fd + 1;
sFD_SET(fd, &readfds);
create_session(fd, connect_client, null_send, null_parse);
session[fd]->client_addr = 0; // just listens
session[fd]->rdata_tick = 0; // disable timeouts on this socket
return fd;
}
int make_connection(uint32 ip, uint16 port)
{
struct sockaddr_in remote_address;
int fd;
int result;
fd = sSocket(AF_INET, SOCK_STREAM, 0);
if (fd == -1) {
ShowError("make_connection: socket creation failed (code %d)!\n", sErrno);
return -1;
}
if( fd == 0 )
{// reserved
ShowError("make_connection: Socket #0 is reserved - Please report this!!!\n");
sClose(fd);
return -1;
}
if( fd >= FD_SETSIZE )
{// socket number too big
ShowError("make_connection: New socket #%d is greater than can we handle! Increase the value of FD_SETSIZE (currently %d) for your OS to fix this!\n", fd, FD_SETSIZE);
sClose(fd);
return -1;
}
setsocketopts(fd);
remote_address.sin_family = AF_INET;
remote_address.sin_addr.s_addr = htonl(ip);
remote_address.sin_port = htons(port);
ShowStatus("Connecting to %d.%d.%d.%d:%i\n", CONVIP(ip), port);
result = sConnect(fd, (struct sockaddr *)(&remote_address), sizeof(struct sockaddr_in));
if( result == SOCKET_ERROR ) {
ShowError("make_connection: connect failed (socket #%d, code %d)!\n", fd, sErrno);
do_close(fd);
return -1;
}
//Now the socket can be made non-blocking. [Skotlex]
set_nonblocking(fd, 1);
if (fd_max <= fd) fd_max = fd + 1;
sFD_SET(fd,&readfds);
create_session(fd, recv_to_fifo, send_from_fifo, default_func_parse);
session[fd]->client_addr = ntohl(remote_address.sin_addr.s_addr);
return fd;
}
static int create_session(int fd, RecvFunc func_recv, SendFunc func_send, ParseFunc func_parse)
{
CREATE(session[fd], struct socket_data, 1);
CREATE(session[fd]->rdata, unsigned char, RFIFO_SIZE);
CREATE(session[fd]->wdata, unsigned char, WFIFO_SIZE);
session[fd]->max_rdata = RFIFO_SIZE;
session[fd]->max_wdata = WFIFO_SIZE;
session[fd]->func_recv = func_recv;
session[fd]->func_send = func_send;
session[fd]->func_parse = func_parse;
session[fd]->rdata_tick = last_tick;
return 0;
}
static void delete_session(int fd)
{
if( session_isValid(fd) )
{
aFree(session[fd]->rdata);
aFree(session[fd]->wdata);
aFree(session[fd]->session_data);
aFree(session[fd]);
session[fd] = NULL;
}
}
int realloc_fifo(int fd, unsigned int rfifo_size, unsigned int wfifo_size)
{
if( !session_isValid(fd) )
return 0;
if( session[fd]->max_rdata != rfifo_size && session[fd]->rdata_size < rfifo_size) {
RECREATE(session[fd]->rdata, unsigned char, rfifo_size);
session[fd]->max_rdata = rfifo_size;
}
if( session[fd]->max_wdata != wfifo_size && session[fd]->wdata_size < wfifo_size) {
RECREATE(session[fd]->wdata, unsigned char, wfifo_size);
session[fd]->max_wdata = wfifo_size;
}
return 0;
}
int realloc_writefifo(int fd, size_t addition)
{
size_t newsize;
if( !session_isValid(fd) ) // might not happen
return 0;
if( session[fd]->wdata_size + addition > session[fd]->max_wdata )
{ // grow rule; grow in multiples of WFIFO_SIZE
newsize = WFIFO_SIZE;
while( session[fd]->wdata_size + addition > newsize ) newsize += WFIFO_SIZE;
}
else
if( session[fd]->max_wdata >= (size_t)2*(session[fd]->flag.server?FIFOSIZE_SERVERLINK:WFIFO_SIZE)
&& (session[fd]->wdata_size+addition)*4 < session[fd]->max_wdata )
{ // shrink rule, shrink by 2 when only a quarter of the fifo is used, don't shrink below nominal size.
newsize = session[fd]->max_wdata / 2;
}
else // no change
return 0;
RECREATE(session[fd]->wdata, unsigned char, newsize);
session[fd]->max_wdata = newsize;
return 0;
}
/// advance the RFIFO cursor (marking 'len' bytes as processed)
int RFIFOSKIP(int fd, size_t len)
{
struct socket_data *s;
if ( !session_isActive(fd) )
return 0;
s = session[fd];
if ( s->rdata_size < s->rdata_pos + len ) {
ShowError("RFIFOSKIP: skipped past end of read buffer! Adjusting from %d to %d (session #%d)\n", len, RFIFOREST(fd), fd);
len = RFIFOREST(fd);
}
s->rdata_pos = s->rdata_pos + len;
return 0;
}
/// advance the WFIFO cursor (marking 'len' bytes for sending)
int WFIFOSET(int fd, size_t len)
{
size_t newreserve;
struct socket_data* s = session[fd];
if( !session_isValid(fd) || s->wdata == NULL )
return 0;
// we have written len bytes to the buffer already before calling WFIFOSET
if(s->wdata_size+len > s->max_wdata)
{ // actually there was a buffer overflow already
uint32 ip = s->client_addr;
ShowFatalError("WFIFOSET: Write Buffer Overflow. Connection %d (%d.%d.%d.%d) has written %u bytes on a %u/%u bytes buffer.\n", fd, CONVIP(ip), (unsigned int)len, (unsigned int)s->wdata_size, (unsigned int)s->max_wdata);
ShowDebug("Likely command that caused it: 0x%x\n", (*(uint16*)(s->wdata + s->wdata_size)));
// no other chance, make a better fifo model
exit(EXIT_FAILURE);
}
if( len > 0xFFFF )
{
// dynamic packets allow up to UINT16_MAX bytes (<packet_id>.W <packet_len>.W ...)
// all known fixed-size packets are within this limit, so use the same limit
ShowFatalError("WFIFOSET: Packet 0x%x is too big. (len=%u, max=%u)\n", (*(uint16*)(s->wdata + s->wdata_size)), (unsigned int)len, 0xFFFF);
exit(EXIT_FAILURE);
}
if( !s->flag.server && len > socket_max_client_packet )
{// see declaration of socket_max_client_packet for details
ShowError("WFIFOSET: Dropped too large client packet 0x%04x (length=%u, max=%u).\n", WFIFOW(fd,0), len, socket_max_client_packet);
return 0;
}
if( !s->flag.server && s->wdata_size+len > WFIFO_MAX )
{// reached maximum write fifo size
ShowError("WFIFOSET: Maximum write buffer size for client connection %d exceeded, most likely caused by packet 0x%04x (len=%u, ip=%lu.%lu.%lu.%lu).\n", fd, WFIFOW(fd,0), len, CONVIP(s->client_addr));
set_eof(fd);
return 0;
}
s->wdata_size += len;
//If the interserver has 200% of its normal size full, flush the data.
if( s->flag.server && s->wdata_size >= 2*FIFOSIZE_SERVERLINK )
flush_fifo(fd);
// always keep a WFIFO_SIZE reserve in the buffer
// For inter-server connections, let the reserve be 1/4th of the link size.
newreserve = s->flag.server ? FIFOSIZE_SERVERLINK / 4 : WFIFO_SIZE;
// readjust the buffer to include the chosen reserve
realloc_writefifo(fd, newreserve);
#ifdef SEND_SHORTLIST
send_shortlist_add_fd(fd);
#endif
return 0;
}
int do_sockets(int next)
{
fd_set rfd;
struct timeval timeout;
int ret,i;
// PRESEND Timers are executed before do_sendrecv and can send packets and/or set sessions to eof.
// Send remaining data and process client-side disconnects here.
#ifdef SEND_SHORTLIST
send_shortlist_do_sends();
#else
for (i = 1; i < fd_max; i++)
{
if(!session[i])
continue;
if(session[i]->wdata_size)
session[i]->func_send(i);
}
#endif
// can timeout until the next tick
timeout.tv_sec = next/1000;
timeout.tv_usec = next%1000*1000;
memcpy(&rfd, &readfds, sizeof(rfd));
ret = sSelect(fd_max, &rfd, NULL, NULL, &timeout);
if( ret == SOCKET_ERROR )
{
if( sErrno != S_EINTR )
{
ShowFatalError("do_sockets: select() failed, error code %d!\n", sErrno);
exit(EXIT_FAILURE);
}
return 0; // interrupted by a signal, just loop and try again
}
last_tick = time(NULL);
#if defined(WIN32)
// on windows, enumerating all members of the fd_set is way faster if we access the internals
for( i = 0; i < (int)rfd.fd_count; ++i )
{
int fd = sock2fd(rfd.fd_array[i]);
if( session[fd] )
session[fd]->func_recv(fd);
}
#else
// otherwise assume that the fd_set is a bit-array and enumerate it in a standard way
for( i = 1; ret && i < fd_max; ++i )
{
if(sFD_ISSET(i,&rfd) && session[i])
{
session[i]->func_recv(i);
--ret;
}
}
#endif
// POSTSEND Send remaining data and handle eof sessions.
#ifdef SEND_SHORTLIST
send_shortlist_do_sends();
#else
for (i = 1; i < fd_max; i++)
{
if(!session[i])
continue;
if(session[i]->wdata_size)
session[i]->func_send(i);
if(session[i]->flag.eof) //func_send can't free a session, this is safe.
{ //Finally, even if there is no data to parse, connections signalled eof should be closed, so we call parse_func [Skotlex]
session[i]->func_parse(i); //This should close the session immediately.
}
}
#endif
// parse input data on each socket
for(i = 1; i < fd_max; i++)
{
if(!session[i])
continue;
if (session[i]->rdata_tick && DIFF_TICK(last_tick, session[i]->rdata_tick) > stall_time) {
ShowInfo("Session #%d timed out\n", i);
set_eof(i);
}
session[i]->func_parse(i);
if(!session[i])
continue;
// after parse, check client's RFIFO size to know if there is an invalid packet (too big and not parsed)
if (session[i]->rdata_size == RFIFO_SIZE && session[i]->max_rdata == RFIFO_SIZE) {
set_eof(i);
continue;
}
RFIFOFLUSH(i);
}
return 0;
}
//////////////////////////////
#ifndef MINICORE
//////////////////////////////
// IP rules and DDoS protection
typedef struct _connect_history {
struct _connect_history* next;
uint32 ip;
uint32 tick;
int count;
unsigned ddos : 1;
} ConnectHistory;
typedef struct _access_control {
uint32 ip;
uint32 mask;
} AccessControl;
enum _aco {
ACO_DENY_ALLOW,
ACO_ALLOW_DENY,
ACO_MUTUAL_FAILURE
};
static AccessControl* access_allow = NULL;
static AccessControl* access_deny = NULL;
static int access_order = ACO_DENY_ALLOW;
static int access_allownum = 0;
static int access_denynum = 0;
static int access_debug = 0;
static int ddos_count = 10;
static int ddos_interval = 3*1000;
static int ddos_autoreset = 10*60*1000;
/// Connection history, an array of linked lists.
/// The array's index for any ip is ip&0xFFFF
static ConnectHistory* connect_history[0x10000];
static int connect_check_(uint32 ip);
/// Verifies if the IP can connect. (with debug info)
/// @see connect_check_()
static int connect_check(uint32 ip)
{
int result = connect_check_(ip);
if( access_debug ) {
ShowInfo("connect_check: Connection from %d.%d.%d.%d %s\n", CONVIP(ip),result ? "allowed." : "denied!");
}
return result;
}
/// Verifies if the IP can connect.
/// 0 : Connection Rejected
/// 1 or 2 : Connection Accepted
static int connect_check_(uint32 ip)
{
ConnectHistory* hist = connect_history[ip&0xFFFF];
int i;
int is_allowip = 0;
int is_denyip = 0;
int connect_ok = 0;
// Search the allow list
for( i=0; i < access_allownum; ++i ){
if( (ip & access_allow[i].mask) == (access_allow[i].ip & access_allow[i].mask) ){
if( access_debug ){
ShowInfo("connect_check: Found match from allow list:%d.%d.%d.%d IP:%d.%d.%d.%d Mask:%d.%d.%d.%d\n",
CONVIP(ip),
CONVIP(access_allow[i].ip),
CONVIP(access_allow[i].mask));
}
is_allowip = 1;
break;
}
}
// Search the deny list
for( i=0; i < access_denynum; ++i ){
if( (ip & access_deny[i].mask) == (access_deny[i].ip & access_deny[i].mask) ){
if( access_debug ){
ShowInfo("connect_check: Found match from deny list:%d.%d.%d.%d IP:%d.%d.%d.%d Mask:%d.%d.%d.%d\n",
CONVIP(ip),
CONVIP(access_deny[i].ip),
CONVIP(access_deny[i].mask));
}
is_denyip = 1;
break;
}
}
// Decide connection status
// 0 : Reject
// 1 : Accept
// 2 : Unconditional Accept (accepts even if flagged as DDoS)
switch(access_order) {
case ACO_DENY_ALLOW:
default:
if( is_denyip )
connect_ok = 0; // Reject
else if( is_allowip )
connect_ok = 2; // Unconditional Accept
else
connect_ok = 1; // Accept
break;
case ACO_ALLOW_DENY:
if( is_allowip )
connect_ok = 2; // Unconditional Accept
else if( is_denyip )
connect_ok = 0; // Reject
else
connect_ok = 1; // Accept
break;
case ACO_MUTUAL_FAILURE:
if( is_allowip && !is_denyip )
connect_ok = 2; // Unconditional Accept
else
connect_ok = 0; // Reject
break;
}
// Inspect connection history
while( hist ) {
if( ip == hist->ip )
{// IP found
if( hist->ddos )
{// flagged as DDoS
return (connect_ok == 2 ? 1 : 0);
} else if( DIFF_TICK(gettick(),hist->tick) < ddos_interval )
{// connection within ddos_interval
hist->tick = gettick();
if( hist->count++ >= ddos_count )
{// DDoS attack detected
hist->ddos = 1;
ShowWarning("connect_check: DDoS Attack detected from %d.%d.%d.%d!\n", CONVIP(ip));
return (connect_ok == 2 ? 1 : 0);
}
return connect_ok;
} else
{// not within ddos_interval, clear data
hist->tick = gettick();
hist->count = 0;
return connect_ok;
}
}
hist = hist->next;
}
// IP not found, add to history
CREATE(hist, ConnectHistory, 1);
memset(hist, 0, sizeof(ConnectHistory));
hist->ip = ip;
hist->tick = gettick();
hist->next = connect_history[ip&0xFFFF];
connect_history[ip&0xFFFF] = hist;
return connect_ok;
}
/// Timer function.
/// Deletes old connection history records.
static int connect_check_clear(int tid, unsigned int tick, int id, intptr_t data)
{
int i;
int clear = 0;
int list = 0;
ConnectHistory root;
ConnectHistory* prev_hist;
ConnectHistory* hist;
for( i=0; i < 0x10000 ; ++i ){
prev_hist = &root;
root.next = hist = connect_history[i];
while( hist ){
if( (!hist->ddos && DIFF_TICK(tick,hist->tick) > ddos_interval*3) ||
(hist->ddos && DIFF_TICK(tick,hist->tick) > ddos_autoreset) )
{// Remove connection history
prev_hist->next = hist->next;
aFree(hist);
hist = prev_hist->next;
clear++;
} else {
prev_hist = hist;
hist = hist->next;
}
list++;
}
connect_history[i] = root.next;
}
if( access_debug ){
ShowInfo("connect_check_clear: Cleared %d of %d from IP list.\n", clear, list);
}
return list;
}
/// Parses the ip address and mask and puts it into acc.
/// Returns 1 is successful, 0 otherwise.
int access_ipmask(const char* str, AccessControl* acc)
{
uint32 ip;
uint32 mask;
unsigned int a[4];
unsigned int m[4];
int n;
if( strcmp(str,"all") == 0 ) {
ip = 0;
mask = 0;
} else {
if( ((n=sscanf(str,"%u.%u.%u.%u/%u.%u.%u.%u",a,a+1,a+2,a+3,m,m+1,m+2,m+3)) != 8 && // not an ip + standard mask
(n=sscanf(str,"%u.%u.%u.%u/%u",a,a+1,a+2,a+3,m)) != 5 && // not an ip + bit mask
(n=sscanf(str,"%u.%u.%u.%u",a,a+1,a+2,a+3)) != 4 ) || // not an ip
a[0] > 255 || a[1] > 255 || a[2] > 255 || a[3] > 255 || // invalid ip
(n == 8 && (m[0] > 255 || m[1] > 255 || m[2] > 255 || m[3] > 255)) || // invalid standard mask
(n == 5 && m[0] > 32) ){ // invalid bit mask
return 0;
}
ip = MAKEIP(a[0],a[1],a[2],a[3]);
if( n == 8 )
{// standard mask
mask = MAKEIP(m[0],m[1],m[2],m[3]);
} else if( n == 5 )
{// bit mask
mask = 0;
while( m[0] ){
mask = (mask >> 1) | 0x80000000;
--m[0];
}
} else
{// just this ip
mask = 0xFFFFFFFF;
}
}
if( access_debug ){
ShowInfo("access_ipmask: Loaded IP:%d.%d.%d.%d mask:%d.%d.%d.%d\n", CONVIP(ip), CONVIP(mask));
}
acc->ip = ip;
acc->mask = mask;
return 1;
}
//////////////////////////////
#endif
//////////////////////////////
int socket_config_read(const char* cfgName)
{
char line[1024],w1[1024],w2[1024];
FILE *fp;
fp = fopen(cfgName, "r");
if(fp == NULL) {
ShowError("File not found: %s\n", cfgName);
return 1;
}
while(fgets(line, sizeof(line), fp))
{
if(line[0] == '/' && line[1] == '/')
continue;
if(sscanf(line, "%[^:]: %[^\r\n]", w1, w2) != 2)
continue;
if (!strcmpi(w1, "stall_time"))
stall_time = atoi(w2);
#ifndef MINICORE
else if (!strcmpi(w1, "enable_ip_rules")) {
ip_rules = config_switch(w2);
} else if (!strcmpi(w1, "order")) {
if (!strcmpi(w2, "deny,allow"))
access_order = ACO_DENY_ALLOW;
else if (!strcmpi(w2, "allow,deny"))
access_order = ACO_ALLOW_DENY;
else if (!strcmpi(w2, "mutual-failure"))
access_order = ACO_MUTUAL_FAILURE;
} else if (!strcmpi(w1, "allow")) {
RECREATE(access_allow, AccessControl, access_allownum+1);
if (access_ipmask(w2, &access_allow[access_allownum]))
++access_allownum;
else
ShowError("socket_config_read: Invalid ip or ip range '%s'!\n", line);
} else if (!strcmpi(w1, "deny")) {
RECREATE(access_deny, AccessControl, access_denynum+1);
if (access_ipmask(w2, &access_deny[access_denynum]))
++access_denynum;
else
ShowError("socket_config_read: Invalid ip or ip range '%s'!\n", line);
}
else if (!strcmpi(w1,"ddos_interval"))
ddos_interval = atoi(w2);
else if (!strcmpi(w1,"ddos_count"))
ddos_count = atoi(w2);
else if (!strcmpi(w1,"ddos_autoreset"))
ddos_autoreset = atoi(w2);
else if (!strcmpi(w1,"debug"))
access_debug = config_switch(w2);
else if (!strcmpi(w1,"socket_max_client_packet"))
socket_max_client_packet = strtoul(w2, NULL, 0);
#endif
else if (!strcmpi(w1, "import"))
socket_config_read(w2);
}
fclose(fp);
return 0;
}
void socket_final(void)
{
int i;
#ifndef MINICORE
ConnectHistory* hist;
ConnectHistory* next_hist;
for( i=0; i < 0x10000; ++i ){
hist = connect_history[i];
while( hist ){
next_hist = hist->next;
aFree(hist);
hist = next_hist;
}
}
if( access_allow )
aFree(access_allow);
if( access_deny )
aFree(access_deny);
#endif
for( i = 1; i < fd_max; i++ )
if(session[i])
do_close(i);
// session[0] �̃_�~�[�f�[�^���폜
aFree(session[0]->rdata);
aFree(session[0]->wdata);
aFree(session[0]);
}
/// Closes a socket.
void do_close(int fd)
{
if( fd <= 0 ||fd >= FD_SETSIZE )
return;// invalid
flush_fifo(fd); // Try to send what's left (although it might not succeed since it's a nonblocking socket)
sFD_CLR(fd, &readfds);// this needs to be done before closing the socket
sShutdown(fd, SHUT_RDWR); // Disallow further reads/writes
sClose(fd); // We don't really care if these closing functions return an error, we are just shutting down and not reusing this socket.
if (session[fd]) delete_session(fd);
}
/// Retrieve local ips in host byte order.
/// Uses loopback is no address is found.
int socket_getips(uint32* ips, int max)
{
int num = 0;
if( ips == NULL || max <= 0 )
return 0;
#ifdef WIN32
{
char fullhost[255];
u_long** a;
struct hostent* hent;
// XXX This should look up the local IP addresses in the registry
// instead of calling gethostbyname. However, the way IP addresses
// are stored in the registry is annoyingly complex, so I'll leave
// this as T.B.D. [Meruru]
if( gethostname(fullhost, sizeof(fullhost)) == SOCKET_ERROR )
{
ShowError("socket_getips: No hostname defined!\n");
return 0;
}
else
{
hent = gethostbyname(fullhost);
if( hent == NULL ){
ShowError("socket_getips: Cannot resolve our own hostname to an IP address\n");
return 0;
}
a = (u_long**)hent->h_addr_list;
for( ; a[num] != NULL && num < max; ++num)
ips[num] = (uint32)ntohl(*a[num]);
}
}
#else // not WIN32
{
int pos;
int fd;
char buf[2*16*sizeof(struct ifreq)];
struct ifconf ic;
struct ifreq* ir;
struct sockaddr_in* a;
u_long ad;
fd = sSocket(AF_INET, SOCK_STREAM, 0);
memset(buf, 0x00, sizeof(buf));
// The ioctl call will fail with Invalid Argument if there are more
// interfaces than will fit in the buffer
ic.ifc_len = sizeof(buf);
ic.ifc_buf = buf;
if( sIoctl(fd, SIOCGIFCONF, &ic) == -1 )
{
ShowError("socket_getips: SIOCGIFCONF failed!\n");
return 0;
}
else
{
for( pos=0; pos < ic.ifc_len && num < max; )
{
ir = (struct ifreq*)(buf+pos);
a = (struct sockaddr_in*) &(ir->ifr_addr);
if( a->sin_family == AF_INET ){
ad = ntohl(a->sin_addr.s_addr);
if( ad != INADDR_LOOPBACK && ad != INADDR_ANY )
ips[num++] = (uint32)ad;
}
#if (defined(BSD) && BSD >= 199103) || defined(_AIX) || defined(__APPLE__)
pos += ir->ifr_addr.sa_len + sizeof(ir->ifr_name);
#else// not AIX or APPLE
pos += sizeof(struct ifreq);
#endif//not AIX or APPLE
}
}
sClose(fd);
}
#endif // not W32
// Use loopback if no ips are found
if( num == 0 )
ips[num++] = (uint32)INADDR_LOOPBACK;
return num;
}
void socket_init(void)
{
char *SOCKET_CONF_FILENAME = "conf/packet_athena.conf";
#ifdef WIN32
{// Start up windows networking
WSADATA wsaData;
WORD wVersionRequested = MAKEWORD(2, 0);
if( WSAStartup(wVersionRequested, &wsaData) != 0 )
{
ShowError("socket_init: WinSock not available!\n");
return;
}
if( LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 0 )
{
ShowError("socket_init: WinSock version mismatch (2.0 or compatible required)!\n");
return;
}
}
#elif defined(HAVE_SETRLIMIT) && !defined(CYGWIN)
// NOTE: getrlimit and setrlimit have bogus behaviour in cygwin.
// "Number of fds is virtually unlimited in cygwin" (sys/param.h)
{// set socket limit to FD_SETSIZE
struct rlimit rlp;
if( 0 == getrlimit(RLIMIT_NOFILE, &rlp) )
{
rlp.rlim_cur = FD_SETSIZE;
if( 0 != setrlimit(RLIMIT_NOFILE, &rlp) )
{// failed, try setting the maximum too (permission to change system limits is required)
rlp.rlim_max = FD_SETSIZE;
if( 0 != setrlimit(RLIMIT_NOFILE, &rlp) )
{// failed
// set to maximum allowed
getrlimit(RLIMIT_NOFILE, &rlp);
rlp.rlim_cur = rlp.rlim_max;
setrlimit(RLIMIT_NOFILE, &rlp);
// report limit
getrlimit(RLIMIT_NOFILE, &rlp);
ShowWarning("socket_init: failed to set socket limit to %d (current limit %d).\n", FD_SETSIZE, (int)rlp.rlim_cur);
}
}
}
}
#endif
// Get initial local ips
naddr_ = socket_getips(addr_,16);
sFD_ZERO(&readfds);
#if defined(SEND_SHORTLIST)
memset(send_shortlist_set, 0, sizeof(send_shortlist_set));
#endif
socket_config_read(SOCKET_CONF_FILENAME);
// initialise last send-receive tick
last_tick = time(NULL);
// session[0] is now currently used for disconnected sessions of the map server, and as such,
// should hold enough buffer (it is a vacuum so to speak) as it is never flushed. [Skotlex]
create_session(0, null_recv, null_send, null_parse);
#ifndef MINICORE
// Delete old connection history every 5 minutes
memset(connect_history, 0, sizeof(connect_history));
add_timer_func_list(connect_check_clear, "connect_check_clear");
add_timer_interval(gettick()+1000, connect_check_clear, 0, 0, 5*60*1000);
#endif
}
bool session_isValid(int fd)
{
return ( fd > 0 && fd < FD_SETSIZE && session[fd] != NULL );
}
bool session_isActive(int fd)
{
return ( session_isValid(fd) && !session[fd]->flag.eof );
}
// Resolves hostname into a numeric ip.
uint32 host2ip(const char* hostname)
{
struct hostent* h = gethostbyname(hostname);
return (h != NULL) ? ntohl(*(uint32*)h->h_addr) : 0;
}
// Converts a numeric ip into a dot-formatted string.
// Result is placed either into a user-provided buffer or a static system buffer.
const char* ip2str(uint32 ip, char ip_str[16])
{
struct in_addr addr;
addr.s_addr = htonl(ip);
return (ip_str == NULL) ? inet_ntoa(addr) : strncpy(ip_str, inet_ntoa(addr), 16);
}
// Converts a dot-formatted ip string into a numeric ip.
uint32 str2ip(const char* ip_str)
{
return ntohl(inet_addr(ip_str));
}
// Reorders bytes from network to little endian (Windows).
// Neccessary for sending port numbers to the RO client until Gravity notices that they forgot ntohs() calls.
uint16 ntows(uint16 netshort)
{
return ((netshort & 0xFF) << 8) | ((netshort & 0xFF00) >> 8);
}
#ifdef SEND_SHORTLIST
// Add a fd to the shortlist so that it'll be recognized as a fd that needs
// sending or eof handling.
void send_shortlist_add_fd(int fd)
{
int i;
int bit;
if( !session_isValid(fd) )
return;// out of range
i = fd/32;
bit = fd%32;
if( (send_shortlist_set[i]>>bit)&1 )
return;// already in the list
// set the bit
send_shortlist_set[i] |= 1<<bit;
// Add to the end of the shortlist array.
send_shortlist_array[send_shortlist_count++] = fd;
}
// Do pending network sends and eof handling from the shortlist.
void send_shortlist_do_sends()
{
int i = 0;
while( i < send_shortlist_count )
{
int fd = send_shortlist_array[i];
// If this session still exists, perform send operations on it and
// check for the eof state.
if( session[fd] )
{
// Send data
if( session[fd]->wdata_size )
session[fd]->func_send(fd);
// If it's been marked as eof, call the parse func on it so that
// the socket will be immediately closed.
if( session[fd]->flag.eof )
session[fd]->func_parse(fd);
// If the session still exists, is not eof and has things left to
// be sent from it we'll keep it in the shortlist.
if( session[fd] && !session[fd]->flag.eof && session[fd]->wdata_size )
{
++i;
continue;
}
}
// Remove fd from shortlist, move the last fd to the current position
send_shortlist_array[i] = send_shortlist_array[--send_shortlist_count];
send_shortlist_set[fd/32]&=~(1<<(fd%32));
}
}
#endif
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