added new networking subsystem (early stage - files are not compiled yet during normal build!)

Note
	The files i added / modifications i did, are not affecting a normal build
	nothing gets changed yet!

	Linux 2.5+ only yet.

	


git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@16271 54d463be-8e91-2dee-dedb-b68131a5f0ec

configure

@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 16221 .
+# From configure.in Revision: 16226 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.67.
 #
@@ -665,6 +665,7 @@ enable_rdtsc
 enable_profiler
 enable_64bit
 enable_lto
+with_maxconn
 with_mysql
 with_MYSQL_CFLAGS
 with_MYSQL_LIBS
@@ -1312,6 +1313,8 @@ Optional Features:
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
   --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
+  --with-maxconn[=ARG]    optionally set the maximum connections the core can
+                          handle (default: 16384) NOT USED YET - EXPERIMENTAL
   --with-mysql[=ARG]      optionally specify the path to the mysql_config
                           executable
   --with-MYSQL_CFLAGS=ARG specify MYSQL_CFLAGS manually (instead of using
@@ -3530,6 +3533,34 @@ fi
 
 
 
+#
+# Optionally set the max number of network conenctions
+# the core will be support
+#
+
+# Check whether --with-maxconn was given.
+if test "${with_maxconn+set}" = set; then :
+  withval=$with_maxconn;
+		if test "$withval" == "no";	 then
+			CFLAGS="$CFLAGS -DMAXCONN=16384"
+		else
+
+			if ! test "$withval" -ge 0 -o "$withval" -lt 0 2>&- ; then
+				as_fn_error $? "Invalid argument --with-maxconn=$withval ... stopping" "$LINENO" 5
+			else
+				CFLAGS="$CFLAGS -DMAXCONN=$withval"
+			fi
+		fi
+
+else
+
+		CFLAGS="$CFLAGS -DMAXCONN=16384"
+
+
+fi
+
+
+
 #
 # Optionally specify the path to mysql_config
 #

configure.in

@@ -188,6 +188,34 @@ AC_ARG_ENABLE(
 )
 
 
+#
+# Optionally set the max number of network conenctions
+# the core will be support
+#
+AC_ARG_WITH(
+	[maxconn],
+	AC_HELP_STRING(
+		[--with-maxconn@<:@=ARG@:>@],
+		[optionally set the maximum connections the core can handle (default: 16384) NOT USED YET - EXPERIMENTAL]
+	),
+	[
+		if test "$withval" == "no";	 then
+			CFLAGS="$CFLAGS -DMAXCONN=16384"	
+		else
+			
+			if ! test "$withval" -ge 0 -o "$withval" -lt 0 2>&- ; then
+				AC_MSG_ERROR([Invalid argument --with-maxconn=$withval ... stopping])
+			else
+				CFLAGS="$CFLAGS -DMAXCONN=$withval"
+			fi
+		fi
+	],
+	[
+		CFLAGS="$CFLAGS -DMAXCONN=16384"
+	]
+)
+
+
 #
 # Optionally specify the path to mysql_config
 #

src/common/evdp.h

@@ -0,0 +1,168 @@
+#ifndef _rA_EVDP_H_
+#define _rA_EVDP_H_
+
+#include "../common/cbasetypes.h"
+
+typedef struct EVDP_DATA EVDP_DATA;
+
+
+//#idef EVDP_EPOLL
+#include <sys/epoll.h>
+struct EVDP_DATA{
+	struct epoll_event ev_data;
+	bool ev_added;
+};
+//#endif
+
+
+enum EVDP_EVENTFLAGS{
+	EVDP_EVENT_IN = 1,	// Incomming data  
+	EVDP_EVENT_OUT = 2,	// Connection accepts writing.
+	EVDP_EVENT_HUP = 4	// Connection Closed.
+};
+
+typedef struct EVDP_EVENT{
+	int32	events;	// due to performance reasons, this should be the first member.
+	int32	fd;	// Connection Identifier
+} EVDP_EVENT;
+
+
+
+/** 
+ * Network Event Dispatcher Initialization / Finalization routines
+ */
+void evdp_init();
+void evdp_final();
+
+
+/**
+ * Will Wait for events.
+ *
+ * @param *out_ev 		pointer to array in size at least of max_events.
+ * @param max_events	max no of events to report with this call (coalesc)
+ * @param timeout_ticks	max time to wait in ticks (milliseconds) 
+ *
+ * @Note:
+ * 	The function will block until an event has occured on one of the monitored connections
+ *	or the timeout of timeout_ticks has passed by.
+ *	Upon successfull call (changed connections) this function will write the connection
+ *	Identifier & event  to the out_fds array. 
+ *
+ * @return 	0 -> Timeout, 	> 0 no of changed connections.
+ */
+int32 evdp_wait(EVDP_EVENT *out_fds,	int32 max_events, 	int32 timeout_ticks);
+
+
+/** 
+ * Applys the given mask on the given connection.
+ * 
+ * @param fd	connection identifier
+ * @param *ep	event data pointer for the connection
+ * @param mask	new event mask we're monitoring for.
+ */
+//void evdp_apply(int32 fd,  EVDP_DATA *ep,	int32 mask);
+
+
+/** 
+ * Adds a connection (listner) to the event notification system.
+ *
+ * @param fd 	connection identifier
+ * @param *ep	event data pointer for the connection 
+ *
+ * @note: 
+ *	Listener type sockets are edge triggered, (see epoll manual for more information)
+ *  - This basicaly means that youll receive one event, adn you have to accept until accept returns an error (nothing to accept)
+ *
+ * MONITORS by default:   IN
+ * 
+ * @return success indicator.
+ */ 
+bool evdp_addlistener(int32 fd, EVDP_DATA *ep);
+
+/**
+ * Adds a connection (client connectioN) to the event notification system
+ *
+ * @param fd	connection identifier
+ * @param *ep	event data pointr for the connection
+ * 
+ * @note:
+ * 
+ * MONITORS by default:	IN, HUP
+ *
+ * @return success indicator.
+ */
+bool evdp_addclient(int32 fd, EVDP_DATA *ep);
+
+/**
+ * Adds a connection (pending / outgoing connection!) to the event notification system.
+ *
+ * @param fd	connection identifier
+ * @param *ep	event data pointer for the conneciton.
+ *
+ * @note:
+ *	Outgoing connection type sockets are getting monitored for connection established
+ *	successfull
+ *	- if the connection has been established - we're generitng a writable notification .. (send) 
+ * 		this is typical for BSD / posix conform network stacks.
+ *	- Additinionally its edge triggered.
+ *
+ * @see evdp_outgoingconnection_established  
+ *
+ *
+ * @return success indicator
+ */
+bool evdp_addconnecting(int32 fd, EVDP_DATA *ep);
+
+/**
+ * Adds an outgoing connection to the normal event notification system after it has been successfully established. 
+ *
+ * @param fd	connection identifier
+ * @param *ep	event data pointer for the conneciton.
+ 
+ * @note 
+ * 	after this call, its handled like a normal "client" connection (incomming)
+ * 
+ * @rturn success indicator
+ */
+bool evdp_outgoingconnection_established(int32 fd, EVDP_DATA *ep);
+
+/**
+ * Marks a connection to be monitored for writable.
+ *
+ * @param fd	connection identifier
+ * @param *ep	event data pointer for the connection
+ *
+ * @note:
+ *	the connection must be already added (as client or listener)
+ * 
+ *
+ * @return sucess indicator
+ */
+bool evdp_writable_add(int32 fd, EVDP_DATA *ep);
+
+/** 
+ * Removes the connection from writable notification monitoring
+ *
+ * @param fd	connection identifier
+ * @param *ep	event data pointr for the connection
+ *
+ */ 
+void evdp_writable_remove(int32 fd, EVDP_DATA *ep);
+
+/**
+ * Removes an connectio from the event notification system.
+ *
+ * @param fd  connection iditentfir
+ * @param *ep  event data pointer for th connection
+ *
+ *
+ * @note:
+ * 	this will also clear the given EVENT_DATA block 
+ *	so the connection slot is in an "initial" blank status / ready to get reused.
+ *
+ */
+void evdp_remove(int32 fd, 	EVDP_DATA *ep);
+
+
+
+#endif

src/common/evdp_epoll.c

@@ -0,0 +1,233 @@
+//
+// Event Dispatcher Abstraction for EPOLL 
+//
+// Author: Florian Wilkemeyer <fw@f-ws.de>
+//
+// Copyright (c) rAthena Project (www.rathena.org) - Licensed under GNU GPL
+// For more information, see LICENCE in the main folder
+//
+//
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <sys/epoll.h>
+#include <sys/fcntl.h>
+#include <sys/socket.h>
+
+#include "../common/cbasetypes.h"
+#include "../common/showmsg.h"
+#include "../common/evdp.h"
+
+
+#define EPOLL_MAX_PER_CYCLE 10	// Max Events to coalesc. per cycle. 
+
+
+static int epoll_fd = -1;
+
+
+void evdp_init(){
+		
+	epoll_fd = epoll_create( EPOLL_MAX_PER_CYCLE );
+	if(epoll_fd == -1){
+		ShowFatalError("evdp [EPOLL]: Cannot create event dispatcher (errno: %u / %s)\n", errno, strerror(errno) ); 
+		exit(1);
+	}
+		
+}//end: evdp_init()
+
+
+void evdp_final(){
+	
+	if(epoll_fd != -1){
+		close(epoll_fd);
+		epoll_fd = -1;
+	}
+	
+}//end: evdp_final()
+
+
+int32 evdp_wait(EVDP_EVENT *out_fds, int32 max_events, int32 timeout_ticks){
+	struct epoll_event l_events[EPOLL_MAX_PER_CYCLE];
+	register struct epoll_event *ev;
+	register int nfds, n;
+	
+	if(max_events > EPOLL_MAX_PER_CYCLE)
+		max_events = EPOLL_MAX_PER_CYCLE;
+	
+	nfds = epoll_wait( epoll_fd,  l_events,		max_events,		timeout_ticks);
+	if(nfds == -1){
+		// @TODO: check if core is in shutdown mode.  if - ignroe error.
+		
+		ShowFatalError("evdp [EPOLL]: epoll_wait returned bad / unexpected status (errno: %u / %s)\n", errno, strerror(errno));
+		exit(1); //..
+	}
+	
+	// Loop thru all events and copy it to the local ra evdp_event.. struct.
+	for(n = 0; n < nfds; n++){
+		ev = &l_events[n];
+		
+		out_fds->fd = ev->data.fd;
+		out_fds->events = 0; // clear
+		
+		if(ev->events & EPOLLHUP)
+			out_fds->events |= EVDP_EVENT_HUP;
+		
+		if(ev->events & EPOLLIN)
+			out_fds->events |= EVDP_EVENT_IN;
+		
+		if(ev->events & EPOLLOUT)
+			out_fds->events |= EVDP_EVENT_OUT;
+			
+		out_fds++;		
+	}
+
+	return nfds; // 0 on timeout or > 0  .. 
+}//end: evdp_wait()
+
+
+void evdp_remove(int32 fd,  EVDP_DATA *ep){
+	
+	if(ep->ev_added == true){
+		
+		if( epoll_ctl(epoll_fd,  EPOLL_CTL_DEL,  fd,  &ep->ev_data)  != 0){
+			ShowError("evdp [EPOLL]: evdp_remove - epoll_ctl (EPOLL_CTL_DEL) failed! fd #%u (errno %u / %s)\n", fd,  errno, strerror(errno));		
+		}
+		
+		ep->ev_data.events = 0; // clear struct.
+		ep->ev_data.data.fd = -1; // .. clear struct .. 
+
+		ep->ev_added = false; // not added! 
+	}
+	
+
+}//end: evdp_remove()
+
+
+bool evdp_addlistener(int32 fd, EVDP_DATA *ep){
+	
+	ep->ev_data.events = EPOLLET|EPOLLIN;
+	ep->ev_data.data.fd = fd;
+	
+	// No check here for 'added ?'
+	// listeners cannot be added twice.
+	//
+	if( epoll_ctl(epoll_fd,  EPOLL_CTL_ADD,  fd,  &ep->ev_data) != 0 ){
+		ShowError("evdp [EPOLL]: evdp_addlistener - epoll_ctl (EPOLL_CTL_ADD) faield! fd #%u (errno %u / %s)\n", fd, errno, strerror(errno));
+		ep->ev_data.events = 0;
+		ep->ev_data.data.fd = -1;
+		return false;
+	}	
+	
+	ep->ev_added = true;
+	
+	return true;
+}//end: evdp_addlistener()
+
+
+bool evdp_addclient(int32 fd, EVDP_DATA *ep){
+	
+	ep->ev_data.events = EPOLLIN | EPOLLHUP;
+	ep->ev_data.data.fd = fd;
+	
+	// No check for "added?" here,
+	// this function only gets called upon accpept.
+	//
+	
+	if( epoll_ctl(epoll_fd,  EPOLL_CTL_ADD,  fd, &ep->ev_data) != 0){
+		ShowError("evdp [EPOLL]: evdp_addclient - epoll_ctl (EPOLL_CTL_ADD) failed! fd #%u (errno %u / %s)\n", fd, errno, strerror(errno));
+		ep->ev_data.events = 0;
+		ep->ev_data.data.fd = -1;
+		return false;
+	}
+	
+	ep->ev_added = true;
+	
+	return true;
+}//end: evdp_addclient()
+
+
+bool evdp_addconnecting(int32 fd, EVDP_DATA *ep){
+	
+	ep->ev_data.events = EPOLLET | EPOLLOUT | EPOLLHUP;
+	ep->ev_data.data.fd = fd;
+	
+	if( epoll_ctl(epoll_fd,  EPOLL_CTL_ADD,  fd, &ep->ev_data) != 0){
+		ShowError("evdp [EPOLL]: evdp_addconnecting - epoll_ctl (EPOLL_CTL_ADD) failed! fd #%u (errno %u / %s)\n", fd, errno, strerror(errno));
+		ep->ev_data.events = 0;
+		ep->ev_data.data.fd = -1; 	
+	}
+		
+	ep->ev_added = true;
+
+	return true;
+}//end: evdp_addconnecting()
+
+
+bool evdp_outgoingconnection_established(int32 fd, EVDP_DATA *ep){
+	int32 saved_mask;
+	
+	if(ep->ev_added != true){
+		// ! 
+		ShowError("evdp [EPOLL]: evdp_outgoingconnection_established fd #%u is not added to event dispatcher! invalid call.\n", fd);
+		return false;
+	}
+	
+	saved_mask = ep->ev_data.events;
+	
+	ep->ev_data.events = EPOLLIN | EPOLLHUP;
+	
+	if( epoll_ctl(epoll_fd,  EPOLL_CTL_MOD,  fd, &ep->ev_data) != 0){
+		ep->ev_data.events = saved_mask; // restore old mask.
+		ShowError("evdp [EPOLL]: evdp_outgoingconnection_established - epoll_ctl (EPOLL_CTL_MOD) failed! fd #%u (errno %u / %s)\n", fd, errno, strerror(errno));
+		return false;		
+	}
+	
+	return true;
+}//end: evdp_outgoingconnection_established()
+
+
+bool evdp_writable_add(int32 fd, EVDP_DATA *ep){
+	
+	if(ep->ev_added != true){
+		ShowError("evdp [EPOLL]: evdp_writable_add - tried to add not added fd #%u\n",fd);
+		return false;
+	}
+	
+	if(! (ep->ev_data.events  & EPOLLOUT) ){ // 
+	
+		ep->ev_data.events |= EPOLLOUT;
+		if( epoll_ctl(epoll_fd, EPOLL_CTL_MOD, fd, &ep->ev_data) != 0 ){
+			ShowError("evdp [EPOLL]: evdp_writable_add - epoll_ctl (EPOLL_CTL_MOD) failed! fd #%u (errno: %u / %s)\n", fd, errno, strerror(errno));
+			ep->ev_data.events &= ~EPOLLOUT; // remove from local flagmask due to failed syscall.
+			return false;
+		}
+	}
+	
+	return true;	
+}//end: evdp_writable_add()
+
+
+void evdp_writable_remove(int32 fd, EVDP_DATA *ep){
+	
+	if(ep->ev_added != true){
+		ShowError("evdp [EPOLL]: evdp_writable_remove - tried to remove not added fd #%u\n", fd);
+		return;
+	}
+	
+	if( ep->ev_data.events & EPOLLOUT ){
+		
+		ep->ev_data.events &= ~EPOLLOUT;
+		if( epoll_ctl(epoll_fd, EPOLL_CTL_MOD, fd, &ep->ev_data) != 0){
+			ShowError("evdp [EPOLL]: evdp_writable_remove - epoll_ctl (EPOLL_CTL_MOD) failed! fd #%u (errno %u / %s)\n", fd, errno, strerror(errno));
+			ep->ev_data.events |= EPOLLOUT; // add back to local flagmask because of failed syscall.
+			return;
+		}		
+	}
+	
+	return;	
+}//end: evdp_writable_remove()
+

src/common/netbuffer.c

@@ -0,0 +1,221 @@
+
+//
+// Network Buffer Subsystem (iobuffer)
+//
+//
+// Author: Florian Wilkemeyer <fw@f-ws.de>
+//
+// Copyright (c) rAthena Project (www.rathena.org) - Licensed under GNU GPL
+// For more information, see LICENCE in the main folder
+//
+//
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "../common/cbasetypes.h"
+#include "../common/atomic.h"
+#include "../common/mempool.h"
+#include "../common/showmsg.h"
+#include "../common/raconf.h"
+#include "../common/thread.h"
+#include "../common/malloc.h"
+#include "../common/core.h"
+
+#include "../common/netbuffer.h"
+
+
+// 
+// Buffers are available in the following sizes:
+//	48,		192,	2048,		8192
+//	65536 (inter server connects may use it for charstatus struct..)  
+//
+
+
+///
+// Implementation:
+//
+static volatile int32 l_nEmergencyAllocations = 0; // stats.
+static sysint l_nPools = 0;
+static sysint *l_poolElemSize = NULL;
+static mempool *l_pool = NULL;
+
+
+void netbuffer_init(){
+	char localsection[32];
+	raconf conf;
+	sysint i;
+	
+	// Initialize Statistic counters:
+	l_nEmergencyAllocations = 0;
+	
+	// Set localsection name according to running serverype.
+	switch(SERVER_TYPE){
+		case ATHENA_SERVER_LOGIN:	strcpy(localsection, "login-netbuffer");		break;
+		case ATHENA_SERVER_CHAR:	strcpy(localsection, "char-netbuffer");			break;
+		case ATHENA_SERVER_INTER:	strcpy(localsection, "inter-netbuffer");		break;
+		case ATHENA_SERVER_MAP:		strcpy(localsection, "map-netbuffer");			break;
+		default:					strcpy(localsection, "unsupported_type");		break;
+	}
+	
+	
+	conf = raconf_parse("conf/network.conf");
+	if(conf == NULL){
+		ShowFatalError("Failed to Parse required Configuration (conf/network.conf)");
+		exit(EXIT_FAILURE);
+	}
+	
+	// Get Values from config file
+	l_nPools = (sysint)raconf_getintEx(conf,  localsection,  "netbuffer", "num", 0);
+	if(l_nPools == 0){
+		ShowFatalError("Netbuffer (network.conf) failure - requires at least 1 Pool.\n");		
+		exit(EXIT_FAILURE);
+	}	
+
+	// Allocate arrays.
+	l_poolElemSize = (sysint*)aCalloc( l_nPools, sizeof(sysint) );
+	l_pool = (mempool*)aCalloc( l_nPools, sizeof(mempool) );
+	
+
+	for(i = 0; i < l_nPools; i++){
+		int64 num_prealloc, num_realloc;
+		char key[32];
+		
+		sprintf(key, "pool_%u_size", (uint32)i+1);
+		l_poolElemSize[i] = (sysint)raconf_getintEx(conf, localsection, "netbuffer", key, 4096);
+		if(l_poolElemSize[i] < 32){
+			ShowWarning("Netbuffer (network.conf) failure - minimum allowed buffer size is 32 byte) - fixed.\n");
+			l_poolElemSize[i] = 32;
+		}
+		
+		sprintf(key, "pool_%u_prealloc", (uint32)i+1);
+		num_prealloc = raconf_getintEx(conf, localsection, "netbuffer", key, 150);
+		
+		sprintf(key, "pool_%u_realloc_step", (uint32)i+1);
+		num_realloc = raconf_getintEx(conf, localsection, "netbuffer", key, 100);
+			
+		// Create Pool!
+		sprintf(key, "Netbuffer %u", (uint32)l_poolElemSize[i]); // name.
+
+		// Info
+		ShowInfo("NetBuffer: Creating Pool %u (Prealloc: %u, Realloc Step: %u) - %0.2f MiB\n", l_poolElemSize[i], num_prealloc, num_realloc, (float)((sizeof(struct netbuf) + l_poolElemSize[i] - 32)* num_prealloc)/1024.0f/1024.0f);
+		
+		//
+		// Size Calculation:
+		//  struct netbuf  +  requested buffer size - 32 (because the struct already contains 32 byte buffer space at the end of struct)
+		l_pool[i] = mempool_create(key,  (sizeof(struct netbuf) + l_poolElemSize[i] - 32),  num_prealloc,  num_realloc, NULL, NULL);
+		if(l_pool[i] == NULL){
+			ShowFatalError("Netbuffer: cannot create Pool for %u byte buffers.\n", l_poolElemSize[i]);
+			// @leak: clean everything :D
+			exit(EXIT_FAILURE);
+		}		
+				
+	}// 
+		
+	
+	raconf_destroy(conf);
+
+}//end: netbuffer_init()
+
+
+void netbuffer_final(){
+	sysint i;
+	
+	if(l_nPools > 0){
+		/// .. finalize mempools
+		for(i = 0; i < l_nPools; i++){
+			mempool_stats stats = mempool_get_stats(l_pool[i]);
+			
+			ShowInfo("Netbuffer: Freeing Pool %u (Peak Usage: %u, Realloc Events: %u)\n", l_poolElemSize[i], stats.peak_nodes_used, stats.num_realloc_events);
+						
+			mempool_destroy(l_pool[i]);
+		}	
+	
+		if(l_nEmergencyAllocations > 0){
+			ShowWarning("Netbuffer: did %u Emergency Allocations, please tune your network.conf!\n", l_nEmergencyAllocations);
+			l_nEmergencyAllocations = 0;
+		}
+	
+		aFree(l_poolElemSize);  l_poolElemSize = NULL;
+		aFree(l_pool);	l_pool = NULL;
+		l_nPools = 0;
+	}
+	
+	
+}//end: netbuffer_final()
+
+
+netbuf netbuffer_get( sysint sz ){
+	sysint i;
+	netbuf nb = NULL;
+	
+	// Search an appropriate pool
+	for(i = 0; i < l_nPools; i++){
+		if(sz <= l_poolElemSize[i]){
+			// match 
+			
+			nb = (netbuf)mempool_node_get(l_pool[i]); 
+			nb->pool = i;
+			
+			break;
+		}		
+	}
+	
+	// No Bufferpool found that mets there quirements?.. (thats bad..)
+	if(nb == NULL){
+		ShowWarning("Netbuffer: get(%u): => no appropriate pool found - emergency allocation required.\n", sz);
+		ShowWarning("Please reconfigure your network.conf!");
+		
+		InterlockedIncrement(&l_nEmergencyAllocations);
+
+		// .. better to check (netbuf struct provides 32 byte bufferspace itself.
+		if(sz < 32)	sz = 32;
+		
+		// allocate memory using malloc .. 
+		while(1){
+			nb = (netbuf) aMalloc(  (sizeof(struct netbuf) + sz - 32) );
+			if(nb != NULL){
+				memset(nb, 0x00, (sizeof(struct netbuf) + sz - 32) ); // zero memory! (to enforce commit @ os.)
+				nb->pool = -1; // emergency alloc.
+				break;
+			}
+			
+			rathread_yield();
+		}// spin allocation.
+		
+	}
+	
+	
+	nb->refcnt = 1;	 // Initial refcount is 1
+
+	return nb;	
+}//end: netbuffer_get()
+
+
+void netbuffer_put( netbuf nb ){
+	
+	// Decrement reference counter, if > 0 do nothing :)
+	if( InterlockedDecrement(&nb->refcnt) > 0 )
+		return;
+	
+	// Is this buffer an emergency allocated buffer?
+	if(nb->pool == -1){
+		aFree(nb); 
+		return;
+	}
+	
+	
+	// Otherwise its a normal mempool based buffer
+	// return it to the according mempool:
+	mempool_node_put( l_pool[nb->pool], nb);
+	
+	
+}//end: netbuffer_put()
+
+
+void netbuffer_incref( netbuf nb ){
+	
+	InterlockedIncrement(&nb->refcnt);
+	
+}//end: netbuf_incref()

src/common/netbuffer.h

@@ -0,0 +1,83 @@
+// Copyright (c) rAthena Project (www.rathena.org) - Licensed under GNU GPL
+// For more information, see LICENCE in the main folder
+
+#ifndef _rA_NETBUFFER_H_
+#define _rA_NETBUFFER_H_
+
+#include "../common/cbasetypes.h"
+
+typedef struct netbuf{
+	sysint	pool;				// The pool ID this buffer belongs to,
+								// is set to -1 if its an emergency allocated buffer 
+	
+	struct netbuf *next;		// Used by Network system.
+
+	volatile int32 refcnt;		// Internal Refcount, it gets lowered every call to netbuffer_put, 
+								// if its getting zero, the buffer will returned back to the pool
+								// and can be reused.
+
+	int32	dataPos;	// Current Offset
+						// Used only for Reading (recv job)
+						// write cases are using the sessions local datapos member due to
+						// shared write buffer support.
+	
+	int32	dataLen;	// read buffer case:
+						//	The length expected to read to.
+						//	when this->dataPos == dateLen, read job has been completed.
+						// write buffer case:
+						//	The lngth of data in te buffer
+						//	when s->dataPos == dataLen, write job has been completed
+						//
+						// Note:
+						//	leftBytes = (dateLen - dataPos)
+						//
+						//	Due to shared buffer support
+						//	dataPos gets not used in write case (each connection has its local offset)
+						//
+
+	// The Bufferspace itself.
+	char buf[32];
+} *netbuf;
+
+
+void netbuffer_init();
+void netbuffer_final();
+
+/**
+ * Gets a netbuffer that has atleast (sz) byes space.
+ *
+ * @note: The netbuffer system guarantees that youll always recevie a buffer.
+ *			no check for null is required!
+ *
+ * @param sz - minimum size needed.
+ *
+ * @return pointer to netbuf struct
+ */
+netbuf netbuffer_get( sysint sz );
+
+
+/** 
+ * Returns the given netbuffer (decreases refcount, if its 0 - the buffer will get returned to the pool)
+ *
+ * @param buf - the buffer to return 
+ */
+void netbuffer_put( netbuf buf );
+
+
+/** 
+ * Increases the Refcount on the given buffer 
+ * (used for areasends .. etc)
+ *
+ */
+void netbuffer_incref( netbuf buf );
+
+
+// Some Useful macros
+#define NBUFP(netbuf,pos) (((uint8*)(netbuf->buf)) + (pos))
+#define NBUFB(netbuf,pos) (*(uint8*)((netbuf->buf) + (pos)))
+#define NBUFW(netbuf,pos) (*(uint16*)((netbuf->buf) + (pos)))
+#define NBUFL(netbuf,pos) (*(uint32*)((netbuf->buf) + (pos)))
+
+
+
+#endif

src/common/network.h

@@ -0,0 +1,189 @@
+#ifndef _rA_NETWORK_H_
+#define _rA_NETWORK_H_
+
+#include <netinet/in.h>
+#include "../common/cbasetypes.h"
+#include "../common/netbuffer.h" 
+#include "../common/evdp.h"
+
+#ifndef MAXCONN
+#define MAXCONN 16384
+#endif
+
+
+typedef struct SESSION{
+	EVDP_DATA	evdp_data;	// Must be always the frist member! (some evdp's may rely on this fact)
+
+	// Connection Type	
+	enum{ NST_FREE=0, NST_LISTENER = 1, NST_CLIENT=2, NST_OUTGOING=3}	type;
+
+	// Flags / Settings.
+	bool v6; // is v6?
+	bool disconnect_in_progress;	// To prevent stack overflows / recursive calls.
+	
+	
+	union{ // union to save memory.
+		struct sockaddr_in	v4;
+		struct sockaddr_in6	v6;
+	}addr;
+	
+
+	// "lowlevel" Handlers
+	// (Implemented by the protocol specific parser)
+	//
+	bool (*onRecv)(int32 fd);	// return false = disconnect
+	bool (*onSend)(int32 fd);	// return false = disconnect
+
+	// Event Handlers for LISTENER type sockets 
+	//
+	// onConnect  gets Called when a connection has been 
+	//	successfully accepted.
+	//	Session entry is available in this Handler!
+	//	A returncode of false will reejct the connection (disconnect)
+	//	Note: When rejecting a connection in onConnect by returning false
+	//		  The onDisconnect handler wont get called!
+	//	Note: the onConnect Handler is also responsible for setting
+	//		  the appropriate netparser (which implements onRecv/onSend..) [protocol specific]
+	//	
+	// onDisconnect  gets called when a connection gets disconnected 
+	//				 (by peer as well as by core)
+	//
+	bool (*onConnect)(int32 fd);	// return false = disconnect (wont accept)
+	void (*onDisconnect)(int32 fd);
+
+
+	// 
+	// Parser specific data
+	//
+	void *netparser_data;	// incase of RO Packet Parser, pointer to packet len table (uint16array)
+	void (*onPacketComplete)(int32 fd, uint16 op, uint16 len, netbuf buf);
+	
+
+	//
+	// Buffers
+	// 
+	struct{
+		enum NETREADSTATE { NRS_WAITOP = 0,	NRS_WAITLEN = 1,	NRS_WAITDATA = 2}	state;
+		
+		uint32	head_left;
+		uint16	head[2];
+		
+		netbuf	buf;
+	} read;
+
+	struct{
+		uint32	max_outstanding;
+		uint32	n_outstanding;
+		
+		uint32	dataPos;
+				
+		netbuf	buf, buf_last;				
+	} write;
+	
+	// Application Level data Pointer
+	// (required for backward compatibility with previous athena socket system.)
+	void *data;
+				
+} SESSION;
+
+
+/**
+ * Subsystem Initialization / Finalization.
+ *
+ */
+void network_init();
+void network_final();
+
+
+/**
+ * Will do the net work :) ..
+ */
+void network_do();
+
+
+/** 
+ * Adds a new listner.
+ *
+ * @param v6	v6 listner? 
+ * @param *addr	the address to listen on.
+ * @param port	port to listen on
+ *
+ * @return -1 on error  otherwise  the identifier of the new listener.
+ */
+int32 network_addlistener(bool v6,  const char *addr,  uint16 port);
+
+
+/**
+ * Tries to establish an outgoing connection.
+ *
+ * @param v6		operate with IPv6 addresses?
+ * @param addr		the address to connect to
+ * @param port		the port to connect to
+ * @param from_addr	the address to connect from (local source / optional if auto  -> NULL)
+ * @param from_port the port to connect from (local source / optional if auto  -> 0)
+ * @param onConnectionEstablishedHandler	callback that gets called when the connection is established.
+ * @param onConnectionLooseHandler			callback that gets called when the connection gets disconnected (or the connection couldnt be established)
+ *
+ * @return -1 on error  otherwise  the identifier of the new connection
+ */
+int32 network_connect(bool v6,
+						const char *addr,
+						uint16 port,
+						const char *from_addr,
+						uint16 from_port,
+						bool (*onConnectionEstablishedHandler)(int32 fd),
+						void (*onConnectionLooseHandler)(int32 fd)
+);
+
+						
+
+/**
+ * Disconnects the given connection
+ *
+ * @param fd  connection identifier.
+ *
+ * @Note:
+ * 	- onDisconnect callback gets called! 
+ *	- cleares (returns) all assigned buffers
+ *
+ */
+void network_disconnect(int32 fd);
+
+
+/** 
+ * Attach's a netbuffer at the end of sending queue to the given connection
+ *
+ * @param fd	connection identifier
+ * @param buf	netbuffer to attach.
+ */
+void network_send(int32 fd,  netbuf buf);
+
+
+/**
+ * Sets the parser to RO Protocol like Packet Parser.
+ * 
+ * @param fd				connection identifier
+ * @param *packetlentable	pointer to array of uint16 in size of UINT16_MAX,
+ * @param onComplteProc		callback for packet completion.
+ *
+ * @note:
+ * 	PacketLen Table Fromat:
+ *	each element's offsets represents th ro opcode.
+ *	value is length.
+ *	a length of 0  means the packet is dynamic.
+ *	a length of UINT16_MAX means the packet is unknown.
+ *
+ *	Static Packets must contain their hader in len so (0x64 ==  55 ..)
+ *
+ */
+void network_parser_set_ro(int32 fd,
+							int16 *packetlentable,
+							void (*onPacketCompleteProc)(int32 fd,  uint16 op,  uint16 len,  netbuf buf) 
+							);
+#define ROPACKET_UNKNOWN UINT16_MAX
+#define ROPACKET_DYNLEN 0
+
+
+
+
+#endif