/************************************************************************
 *   UnrealIRCd - Unreal Internet Relay Chat Daemon - src/modules.c
 *   (C) 2001 Carsten Munk (Techie/Stskeeps) <stskeeps@tspre.org>
 *
 *   See file AUTHORS in IRC package for additional names of
 *   the programmers. 
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 1, or (at your option)
 *   any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id$
 */

#include "struct.h"
#include "common.h"
#include "sys.h"
#include "numeric.h"
#include "msg.h"
#include "channel.h"
#include "version.h"
#include <time.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#ifdef _WIN32
#include <io.h>
#define RTLD_NOW 0
const char *our_dlerror(void);
#elif defined(HPUX)
#include <dl.h>
#define RTLD_NOW BIND_IMMEDIATE
#else
#include <dlfcn.h>
#endif
#include <fcntl.h>
#ifndef _WIN32
#include <dirent.h>
#endif
#include "h.h"
#include "proto.h"
#ifndef RTLD_NOW
#define RTLD_NOW RTLD_LAZY
#endif
#define UNREALCORE
#include "modversion.h"

Hook	   	*Hooks[MAXHOOKTYPES];
Hooktype	Hooktypes[MAXCUSTOMHOOKS];
Callback	*Callbacks[MAXCALLBACKS];	/* Callback objects for modules, used for rehashing etc (can be multiple) */
Callback	*RCallbacks[MAXCALLBACKS];	/* 'Real' callback function, used for callback function calls */
Efunction	*Efunctions[MAXEFUNCTIONS];	/* Efunction objects (used for rehashing) */
MODVAR Module          *Modules = NULL;
MODVAR Versionflag     *Versionflags = NULL;

int     Module_Depend_Resolve(Module *p, char *path);
Module *Module_make(ModuleHeader *header, 
#ifdef _WIN32
       HMODULE mod
#else
       void *mod
#endif
       );

typedef struct {
	char *name;
	void **funcptr;
} EfunctionsList;

/* Efuncs */
int (*do_join)(aClient *cptr, aClient *sptr, int parc, char *parv[]);
void (*join_channel)(aChannel *chptr, aClient *cptr, aClient *sptr, int flags);
int (*can_join)(aClient *cptr, aClient *sptr, aChannel *chptr, char *key, char *parv[]);
void (*do_mode)(aChannel *chptr, aClient *cptr, aClient *sptr, int parc, char *parv[], time_t sendts, int samode);
void (*set_mode)(aChannel *chptr, aClient *cptr, int parc, char *parv[], u_int *pcount,
    char pvar[MAXMODEPARAMS][MODEBUFLEN + 3], int bounce);
int (*m_umode)(aClient *cptr, aClient *sptr, int parc, char *parv[]);
int (*register_user)(aClient *cptr, aClient *sptr, char *nick, char *username, char *umode, char *virthost, char *ip);
int (*tkl_hash)(unsigned int c);
char (*tkl_typetochar)(int type);
aTKline *(*tkl_add_line)(int type, char *usermask, char *hostmask, char *reason, char *setby,
    TS expire_at, TS set_at, TS spamf_tkl_duration, char *spamf_tkl_reason, MatchType match_type);
aTKline *(*tkl_del_line)(aTKline *tkl);
void (*tkl_check_local_remove_shun)(aTKline *tmp);
aTKline *(*tkl_expire)(aTKline * tmp);
EVENT((*tkl_check_expire));
int (*find_tkline_match)(aClient *cptr, int xx);
int (*find_shun)(aClient *cptr);
int(*find_spamfilter_user)(aClient *sptr, int flags);
aTKline *(*find_qline)(aClient *cptr, char *nick, int *ishold);
int  (*find_tkline_match_zap)(aClient *cptr);
void (*tkl_stats)(aClient *cptr, int type, char *para);
void (*tkl_synch)(aClient *sptr);
int (*m_tkl)(aClient *cptr, aClient *sptr, int parc, char *parv[]);
int (*place_host_ban)(aClient *sptr, int action, char *reason, long duration);
int (*dospamfilter)(aClient *sptr, char *str_in, int type, char *target, int flags, aTKline **rettk);
int (*dospamfilter_viruschan)(aClient *sptr, aTKline *tk, int type);
int  (*find_tkline_match_zap_ex)(aClient *cptr, aTKline **rettk);
void (*send_list)(aClient *cptr, int numsend);
unsigned char *(*StripColors)(unsigned char *text);
const char *(*StripControlCodes)(unsigned char *text);
void (*spamfilter_build_user_string)(char *buf, char *nick, aClient *acptr);
int (*is_silenced)(aClient *sptr, aClient *acptr);
void (*send_protoctl_servers)(aClient *sptr, int response);
int (*verify_link)(aClient *cptr, aClient *sptr, char *servername, ConfigItem_link **link_out);
void (*introduce_user)(aClient *to, aClient *acptr);
void (*send_server_message)(aClient *sptr);
void (*send_md_client)(ModDataInfo *mdi, aClient *acptr, ModData *md);
void (*send_md_channel)(ModDataInfo *mdi, aChannel *chptr, ModData *md);
void (*send_md_member)(ModDataInfo *mdi, aChannel *chptr, Member *m, ModData *md);
void (*send_md_membership)(ModDataInfo *mdi, aClient *acptr, Membership *m, ModData *md);
int (*check_banned)(aClient *cptr);

static const EfunctionsList efunction_table[MAXEFUNCTIONS] = {
/* 00 */	{NULL, NULL},
/* 01 */	{"do_join", (void *)&do_join},
/* 02 */	{"join_channel", (void *)&join_channel},
/* 03 */	{"can_join", (void *)&can_join},
/* 04 */	{"do_mode", (void *)&do_mode},
/* 05 */	{"set_mode", (void *)&set_mode},
/* 06 */	{"m_umode", (void *)&m_umode},
/* 07 */	{"register_user", (void *)&register_user},
/* 08 */	{"tkl_hash", (void *)&tkl_hash},
/* 09 */	{"tkl_typetochar", (void *)&tkl_typetochar},
/* 10 */	{"tkl_add_line", (void *)&tkl_add_line},
/* 11 */	{"tkl_del_line", (void *)&tkl_del_line},
/* 12 */	{"tkl_check_local_remove_shun", (void *)&tkl_check_local_remove_shun},
/* 13 */	{"tkl_expire", (void *)&tkl_expire},
/* 14 */	{"tkl_check_expire", (void *)&tkl_check_expire},
/* 15 */	{"find_tkline_match", (void *)&find_tkline_match},
/* 16 */	{"find_shun", (void *)&find_shun},
/* 17 */	{"find_spamfilter_user", (void *)&find_spamfilter_user},
/* 18 */	{"find_qline", (void *)&find_qline},
/* 19 */	{"find_tkline_match_zap", (void *)&find_tkline_match_zap},
/* 20 */	{"tkl_stats", (void *)&tkl_stats},
/* 21 */	{"tkl_synch", (void *)&tkl_synch},
/* 22 */	{"m_tkl", (void *)&m_tkl},
/* 23 */	{"place_host_ban", (void *)&place_host_ban},
/* 24 */	{"dospamfilter", (void *)&dospamfilter},
/* 25 */	{"dospamfilter_viruschan", (void *)&dospamfilter_viruschan},
/* 26 */	{"find_tkline_match_zap_ex", (void *)&find_tkline_match_zap_ex},
/* 27 */	{"send_list", (void *)&send_list},
/* 28 */	{NULL,NULL},
/* 29 */	{NULL,NULL},
/* 30 */	{NULL,NULL},
/* 31 */	{"StripColors", (void *)&StripColors},
/* 32 */	{"StripControlCodes", (void *)&StripControlCodes},
/* 33 */	{"spamfilter_build_user_string", (void *)&spamfilter_build_user_string},
/* 34 */	{"is_silenced", (void *)&is_silenced},
/* 35 */	{"send_protoctl_servers", (void *)&send_protoctl_servers},
/* 36 */	{"verify_link", (void *)&verify_link},
/* 37 */	{"send_server_message", (void *)&send_server_message},
/* 38 */	{"send_md_client", (void *)&send_md_client},
/* 39 */	{"send_md_channel", (void *)&send_md_channel},
/* 40 */	{"send_md_member", (void *)&send_md_member}, 
/* 41 */	{"send_md_membership", (void *)&send_md_membership},
/* 42 */	{"check_banned", (void *)&check_banned},
/* 43 */	{"introduce_user", (void *)&introduce_user},
/* 44 */	{NULL, NULL}
};

#ifdef UNDERSCORE
void *obsd_dlsym(void *handle, char *symbol) {
    size_t buflen = strlen(symbol) + 2;
    char *obsdsymbol = (char*)MyMalloc(buflen);
    void *symaddr = NULL;

    if (obsdsymbol) {
       ircsnprintf(obsdsymbol, buflen, "_%s", symbol);
       symaddr = dlsym(handle, obsdsymbol);
       free(obsdsymbol);
    }

    return symaddr;
}
#endif


void DeleteTempModules(void)
{
	char tempbuf[PATH_MAX+1];
#ifndef _WIN32
	DIR *fd = opendir(TMPDIR);
	struct dirent *dir;

	if (!fd) /* Ouch.. this is NOT good!! */
	{
		config_error("Unable to open temp directory %s: %s, please create one with the appropriate permissions",
			TMPDIR, strerror(errno));
		if (!loop.ircd_booted)
			exit(7);
		return; 
	}

	while ((dir = readdir(fd)))
	{
		char *fname = dir->d_name;
		if (!strcmp(fname, ".") || !strcmp(fname, ".."))
			continue;
		if (!strstr(fname, ".so") && !strstr(fname, ".conf") && strstr(fname, "core"))
			continue; /* core dump */
		ircsnprintf(tempbuf, sizeof(tempbuf), "%s/%s", TMPDIR, fname);
		remove(tempbuf);
	}
	closedir(fd);
#else
	WIN32_FIND_DATA hData;
	HANDLE hFile;
	
	snprintf(tempbuf, sizeof(tempbuf), "%s/*", TMPDIR);
	
	hFile = FindFirstFile(tempbuf, &hData);
	if (hFile != INVALID_HANDLE_VALUE)
	{
		if (strcmp(hData.cFileName, ".") || strcmp(hData.cFileName, ".."))
		{
			ircsnprintf(tempbuf, sizeof(tempbuf), "%s/%s", TMPDIR, hData.cFileName);
			remove(tempbuf);
		}
	}
	while (FindNextFile(hFile, &hData))
	{
		if (!strcmp(hData.cFileName, ".") || !strcmp(hData.cFileName, ".."))
			continue;
		ircsnprintf(tempbuf, sizeof(tempbuf), "%s/%s", TMPDIR, hData.cFileName);
		remove(tempbuf);
	}
	FindClose(hFile);
#endif	
}

void Module_Init(void)
{
	bzero(Hooks, sizeof(Hooks));
	bzero(Hooktypes, sizeof(Hooktypes));
	bzero(Callbacks, sizeof(Callback));
	bzero(RCallbacks, sizeof(Callback));
	bzero(Efunctions, sizeof(Efunction));
}

Module *Module_Find(char *name)
{
	Module *p;
	
	for (p = Modules; p; p = p->next)
	{
		if (!(p->options & MOD_OPT_PERM) &&
		    (!(p->flags & MODFLAG_TESTING) || (p->flags & MODFLAG_DELAYED)))
			continue;
		if (!strcmp(p->header->name, name))
		{
			return (p);
		}
	}
	return NULL;
	
}

int parse_modsys_version(char *version)
{
	int betaversion, tag;
	if (!strcmp(version, "3.2.3"))
		return 0x32300;
	if (sscanf(version, "3.2-b%d-%d", &betaversion, &tag)) 
	{
		switch (betaversion)
		{
			case 5:
				return 0x320b5;
			case 6:
				return 0x320b6;
			case 7:
				return 0x320b7;
			case 8:
				return 0x320b8;
			default:
				return 0;
		}
	}
	return 0;
}

void make_compiler_string(char *buf, size_t buflen, unsigned int ver)
{
unsigned int maj, min, plevel;

	if (ver == 0)
	{
		strlcpy(buf, "0", buflen);
		return;
	}
	
	maj = ver >> 16;
	min = (ver >> 8) & 0xff;
	plevel = ver & 0xff;
	
	if (plevel == 0)
		snprintf(buf, buflen, "%d.%d", maj, min);
	else
		snprintf(buf, buflen, "%d.%d.%d", maj, min, plevel);
}

/*
 * Returns an error if insucessful .. yes NULL is OK! 
*/
char  *Module_Create(char *path_)
{
#ifdef _WIN32
	HMODULE 	Mod;
#else /* _WIN32 */
	void   		*Mod;
#endif /* _WIN32 */
	int		(*Mod_Test)();
	int		(*Mod_Init)();
	int             (*Mod_Load)();
	int             (*Mod_Unload)();
	char    *Mod_Version;
	unsigned int *compiler_version;
	static char 	errorbuf[1024];
	char		path[1024];
	char 		*tmppath;
	ModuleHeader    *mod_header = NULL;
	int		ret = 0;
	Module          *mod = NULL, **Mod_Handle = NULL;
	char *expectedmodversion = our_mod_version;
	unsigned int expectedcompilerversion = our_compiler_version;
	long modsys_ver = 0;
	Debug((DEBUG_DEBUG, "Attempting to load module from %s", path_));

	/* Prefix the module path with MODULESDIR, unless it's an absolute path
	 * (we check for "/", "\" and things like "C:" to detect absolute paths).
_	 */
	if ((*path_ != '/') && (*path_ != '\\') && !(*path_ && (path_[1] == ':')))
	{
		snprintf(path, sizeof(path), "%s/%s", MODULESDIR, path_);
	} else {
		strlcpy(path, path_, sizeof(path));
	}

	/* auto-suffix .dll / .so */
	if (!strstr(path, MODULE_SUFFIX))
		strlcat(path, MODULE_SUFFIX, sizeof(path));
	
	tmppath = unreal_mktemp(TMPDIR, unreal_getmodfilename(path));
	if (!tmppath)
		return "Unable to create temporary file!";

	if (!file_exists(path))
	{
		snprintf(errorbuf, sizeof(errorbuf), "Cannot open module file: %s", strerror(errno));
		return errorbuf;
	}
	/* For OpenBSD, do not do a hardlinkink attempt first because it checks inode
	 * numbers to see if a certain module is already loaded. -- Syzop
	 * EDIT (2009): Looks like Linux got smart too, from now on we always copy....
	 */
	ret = unreal_copyfileex(path, tmppath, 0);
	if (!ret)
	{
		snprintf(errorbuf, sizeof(errorbuf), "Failed to copy module file.");
		return errorbuf;
	}
	if ((Mod = irc_dlopen(tmppath, RTLD_NOW)))
	{
		/* We have engaged the borg cube. Scan for lifesigns. */
		irc_dlsym(Mod, "Mod_Version", Mod_Version);
		if (Mod_Version && strcmp(Mod_Version, expectedmodversion))
		{
			snprintf(errorbuf, sizeof(errorbuf),
			         "Module was compiled for '%s', we were configured for '%s'. SOLUTION: Recompile the module(s).",
			         Mod_Version, expectedmodversion);
			irc_dlclose(Mod);
			remove(tmppath);
			return errorbuf;
		}
		if (!Mod_Version)
		{
			snprintf(errorbuf, sizeof(errorbuf),
				"Module is lacking Mod_Version. Perhaps a very old one you forgot to recompile?");
			irc_dlclose(Mod);
			remove(tmppath);
			return errorbuf;
		}
		irc_dlsym(Mod, "compiler_version", compiler_version);
		if (compiler_version && ( ((*compiler_version) & 0xffff00) != (expectedcompilerversion & 0xffff00) ) )
		{
			char theyhad[64], wehave[64];
			make_compiler_string(theyhad, sizeof(theyhad), *compiler_version);
			make_compiler_string(wehave, sizeof(wehave), expectedcompilerversion);
			snprintf(errorbuf, sizeof(errorbuf),
			         "Module was compiled with GCC %s, core was compiled with GCC %s. SOLUTION: Recompile your UnrealIRCd and all its modules by doing a 'make clean; ./Config -quick && make'.",
			         theyhad, wehave);
			irc_dlclose(Mod);
			remove(tmppath);
			return errorbuf;
		}
		irc_dlsym(Mod, "Mod_Header", mod_header);
		if (!mod_header)
		{
			irc_dlclose(Mod);
			remove(tmppath);
			return ("Unable to locate Mod_Header");
		}
		if (!mod_header->modversion)
		{
			irc_dlclose(Mod);
			remove(tmppath);
			return ("Lacking mod_header->modversion");
		}
		if (!(modsys_ver = parse_modsys_version(mod_header->modversion)))
		{
			snprintf(errorbuf, 1023, "Unsupported module system version '%s'",
				   mod_header->modversion);
			irc_dlclose(Mod);
			remove(tmppath);
			return(errorbuf);
		}
		if (!mod_header->name || !mod_header->version ||
		    !mod_header->description)
		{
			irc_dlclose(Mod);
			remove(tmppath);
			return("Lacking sane header pointer");
		}
		if (Module_Find(mod_header->name))
		{
		        irc_dlclose(Mod);
			remove(tmppath);
			return (NULL);
		}
		mod = (Module *)Module_make(mod_header, Mod);
		mod->tmp_file = strdup(tmppath);
		mod->mod_sys_version = modsys_ver;
		mod->compiler_version = compiler_version ? *compiler_version : 0;

		irc_dlsym(Mod, "Mod_Init", Mod_Init);
		if (!Mod_Init)
		{
			Module_free(mod);
			return ("Unable to locate Mod_Init");
		}
		irc_dlsym(Mod, "Mod_Unload", Mod_Unload);
		if (!Mod_Unload)
		{
			Module_free(mod);
			return ("Unable to locate Mod_Unload");
		}
		irc_dlsym(Mod, "Mod_Load", Mod_Load);
		if (!Mod_Load)
		{
			Module_free(mod);
			return ("Unable to locate Mod_Load"); 
		}
		if (Module_Depend_Resolve(mod, path) == -1)
		{
			Module_free(mod);
			return ("Dependancy problem");
		}
		irc_dlsym(Mod, "Mod_Handle", Mod_Handle);
		if (Mod_Handle)
			*Mod_Handle = mod;
		irc_dlsym(Mod, "Mod_Test", Mod_Test);
		if (Mod_Test)
		{
			if (mod->mod_sys_version >= 0x320b8) {
				if ((ret = (*Mod_Test)(&mod->modinfo)) < MOD_SUCCESS) {
					ircsnprintf(errorbuf, sizeof(errorbuf), "Mod_Test returned %i",
						   ret);
					/* We EXPECT the module to have cleaned up it's mess */
		        		Module_free(mod);
					return (errorbuf);
				}
			}
			else {
				if ((ret = (*Mod_Test)(0)) < MOD_SUCCESS)
				{
					snprintf(errorbuf, 1023, "Mod_Test returned %i",
						   ret);
					/* We EXPECT the module to have cleaned up it's mess */
				        Module_free(mod);
					return (errorbuf);
				}
			}
		}
		mod->flags = MODFLAG_TESTING;		
		AddListItem(mod, Modules);
		return NULL;
	}
	else
	{
		/* Return the error .. */
		return ((char *)irc_dlerror());
	}
}

void Module_DelayChildren(Module *m)
{
	ModuleChild *c;
	for (c = m->children; c; c = c->next)
	{
		c->child->flags |= MODFLAG_DELAYED;
		Module_DelayChildren(c->child);
	}
}

Module *Module_make(ModuleHeader *header, 
#ifdef _WIN32
       HMODULE mod
#else
       void *mod
#endif
       )
{
	Module *modp = NULL;
	
	modp = (Module *)MyMallocEx(sizeof(Module));
	modp->header = header;
	modp->dll = mod;
	modp->flags = MODFLAG_NONE;
	modp->options = 0;
	modp->errorcode = MODERR_NOERROR;
	modp->children = NULL;
	modp->modinfo.size = sizeof(ModuleInfo);
	modp->modinfo.module_load = 0;
	modp->modinfo.handle = modp;
		
	return (modp);
}

void Init_all_testing_modules(void)
{
	
	Module *mi, *next;
	int ret;
	iFP Mod_Init;
	for (mi = Modules; mi; mi = next)
	{
		next = mi->next;
		if (!(mi->flags & MODFLAG_TESTING))
			continue;
		irc_dlsym(mi->dll, "Mod_Init", Mod_Init);
		if (mi->mod_sys_version >= 0x320b8) {
			if ((ret = (*Mod_Init)(&mi->modinfo)) < MOD_SUCCESS) {
				config_error("Error loading %s: Mod_Init returned %i",
					mi->header->name, ret);
		        	Module_free(mi);
				continue;
			}
		}
		else {
			if ((ret = (*Mod_Init)(0)) < MOD_SUCCESS)
			{
				config_error("Error loading %s: Mod_Init returned %i",
					mi->header->name, ret);
			        Module_free(mi);
				continue;
			}
		}		
		mi->flags = MODFLAG_INIT;
	}
}	

void FreeModObj(ModuleObject *obj, Module *m)
{
	if (obj->type == MOBJ_EVENT) {
		LockEventSystem();
		EventDel(obj->object.event);
		UnlockEventSystem();
	}
	else if (obj->type == MOBJ_HOOK) {
		HookDel(obj->object.hook);
	}
	else if (obj->type == MOBJ_COMMAND) {
		CommandDel(obj->object.command);
	}
	else if (obj->type == MOBJ_HOOKTYPE) {
		//HooktypeDel(obj->object.hooktype, m); -- reinstate if we audited this code
	}
	else if (obj->type == MOBJ_VERSIONFLAG) {
		VersionflagDel(obj->object.versionflag, m);
	}
	else if (obj->type == MOBJ_SNOMASK) {
		SnomaskDel(obj->object.snomask);
	}
	else if (obj->type == MOBJ_UMODE) {
		UmodeDel(obj->object.umode);
	}
	else if (obj->type == MOBJ_CMODE) {
		CmodeDel(obj->object.cmode);
	}
	else if (obj->type == MOBJ_CMDOVERRIDE) {
		CmdoverrideDel(obj->object.cmdoverride);
	}
	else if (obj->type == MOBJ_EXTBAN) {
		ExtbanDel(obj->object.extban);
	}
	else if (obj->type == MOBJ_CALLBACK) {
		CallbackDel(obj->object.callback);
	}
	else if (obj->type == MOBJ_EFUNCTION) {
		EfunctionDel(obj->object.efunction);
	}
	else if (obj->type == MOBJ_ISUPPORT) {
		IsupportDel(obj->object.isupport);
	}
	else if (obj->type == MOBJ_MODDATA) {
		ModDataDel(obj->object.moddata);
	}
	else if (obj->type == MOBJ_VALIDATOR) {
		OperClassValidatorDel(obj->object.validator);
	}
	else if (obj->type == MOBJ_CLICAP) {
		ClientCapabilityDel(obj->object.clicap);
	}
}

void Unload_all_loaded_modules(void)
{
	Module *mi, *next;
	ModuleChild *child, *childnext;
	ModuleObject *objs, *objnext;
	iFP Mod_Unload;
	int ret;

	for (mi = Modules; mi; mi = next)
	{
		next = mi->next;
		if (!(mi->flags & MODFLAG_LOADED) || (mi->flags & MODFLAG_DELAYED) || (mi->options & MOD_OPT_PERM))
			continue;
		irc_dlsym(mi->dll, "Mod_Unload", Mod_Unload);
		if (Mod_Unload)
		{
			ret = (*Mod_Unload)(mi->modinfo);
			if (ret == MOD_DELAY)
			{
				mi->flags |= MODFLAG_DELAYED;
				Module_DelayChildren(mi);
			}
		}
		for (objs = mi->objects; objs; objs = objnext) {
			objnext = objs->next;
			FreeModObj(objs, mi);
		}
		for (child = mi->children; child; child = childnext)
		{
			childnext = child->next;
			DelListItem(child,mi->children);
			MyFree(child);
		}
		DelListItem(mi,Modules);
		irc_dlclose(mi->dll);
#ifndef DEBUGMODE
		remove(mi->tmp_file);
#endif
		MyFree(mi->tmp_file);
		MyFree(mi);
	}
}

void Unload_all_testing_modules(void)
{
	Module *mi, *next;
	ModuleChild *child, *childnext;
	ModuleObject *objs, *objnext;

	for (mi = Modules; mi; mi = next)
	{
		next = mi->next;
		if (!(mi->flags & MODFLAG_TESTING))
			continue;
		for (objs = mi->objects; objs; objs = objnext) {
			objnext = objs->next;
			FreeModObj(objs, mi);
		}
		for (child = mi->children; child; child = childnext)
		{
			childnext = child->next;
			DelListItem(child,mi->children);
			MyFree(child);
		}
		DelListItem(mi,Modules);
		irc_dlclose(mi->dll);
		remove(mi->tmp_file);
		MyFree(mi->tmp_file);
		MyFree(mi);
	}
}

/* 
 * Returns -1 if you cannot unload due to children still alive 
 * Returns 1 if successful 
 */
int    Module_free(Module *mod)
{
	Module *p;
	ModuleChild *cp, *cpnext;
	ModuleObject *objs, *next;
	/* Do not kill parent if children still alive */

	for (cp = mod->children; cp; cp = cp->next)
	{
		sendto_realops("Unloading child module %s",
			      cp->child->header->name);
		Module_Unload(cp->child->header->name);
	}
	for (objs = mod->objects; objs; objs = next) {
		next = objs->next;
		FreeModObj(objs, mod);
	}
	for (p = Modules; p; p = p->next)
	{
		for (cp = p->children; cp; cp = cpnext)
		{
			cpnext = cp->next;
			if (cp->child == mod)
			{
				DelListItem(mod, p->children);
				MyFree(cp);
				/* We can assume there can be only one. */
				break;
			}
		}
	}
	DelListItem(mod, Modules);
	irc_dlclose(mod->dll);
	MyFree(mod->tmp_file);
	MyFree(mod);
	return 1;
}

/*
 *  Module_Unload ()
 *     char *name        Internal module name
 *  Returns:
 *     -1                Not able to locate module, severe failure, anything
 *      1                Module unloaded
 *      2                Module wishes delayed unloading, has placed event
 */
int Module_Unload(char *name)
{
	Module *m;
	int    (*Mod_Unload)();
	int    ret;
	for (m = Modules; m; m = m->next)
	{
		if (!strcmp(m->header->name, name))
		{
		       break;
		}
	}      
	if (!m)
		return -1;
	irc_dlsym(m->dll, "Mod_Unload", Mod_Unload);
	if (!Mod_Unload)
	{
		return -1;
	}
	ret = (*Mod_Unload)(m->modinfo);
	if (ret == MOD_DELAY)
	{
		m->flags |= MODFLAG_DELAYED;
		Module_DelayChildren(m);
		return 2;
	}
	if (ret == MOD_FAILED)
	{
		return -1;
	}
	/* No more pain detected, let's unload */
	DelListItem(m, Modules);
	Module_free(m);
	return 1;
}

vFP Module_SymEx(
#ifdef _WIN32
	HMODULE mod
#else
	void *mod
#endif
	, char *name)
{
	vFP	fp;

	if (!name)
		return NULL;
	
	irc_dlsym(mod, name, fp);
	if (fp)
		return (fp);
	return NULL;
}

vFP Module_Sym(char *name)
{
	vFP	fp;
	Module *mi;
	
	if (!name)
		return NULL;

	/* Run through all modules and check for symbols */
	for (mi = Modules; mi; mi = mi->next)
	{
		if (!(mi->flags & MODFLAG_TESTING) || (mi->flags & MODFLAG_DELAYED))
			continue;
		irc_dlsym(mi->dll, name, fp);
		if (fp)
			return (fp);
	}
	return NULL;
}

vFP Module_SymX(char *name, Module **mptr)
{
	vFP	fp;
	Module *mi;
	
	if (!name)
		return NULL;
	
	/* Run through all modules and check for symbols */
	for (mi = Modules; mi; mi = mi->next)
	{
		if (!(mi->flags & MODFLAG_TESTING) || (mi->flags & MODFLAG_DELAYED))
			continue;
		irc_dlsym(mi->dll, name, fp);
		if (fp)
		{
			*mptr = mi;
			return (fp);
		}
	}
	*mptr = NULL;
	return NULL;
}




void module_loadall(void)
{
	iFP	fp;
	Module *mi, *next;
	
	if (!loop.ircd_booted)
	{
		sendto_realops("Ehh, !loop.ircd_booted in module_loadall()");
		return ;
	}
	/* Run through all modules and check for module load */
	for (mi = Modules; mi; mi = next)
	{
		next = mi->next;
		if (mi->flags & MODFLAG_LOADED)
			continue;
		irc_dlsym(mi->dll, "Mod_Load", fp);
		/* Call the module_load */
		if ((*fp)(mi->modinfo) != MOD_SUCCESS)
		{
			config_status("cannot load module %s", mi->header->name);
			Module_free(mi);
		}
		else
			mi->flags = MODFLAG_LOADED;
	}
}

inline int	Module_IsAlreadyChild(Module *parent, Module *child)
{
	ModuleChild *mcp;
	
	for (mcp = parent->children; mcp; mcp = mcp->next)
	{
		if (mcp->child == child) 
			return 1;
	}
	return 0;
}

inline void	Module_AddAsChild(Module *parent, Module *child)
{
	ModuleChild	*childp = NULL;
	
	childp = (ModuleChild *) MyMallocEx(sizeof(ModuleChild));
	childp->child = child;
	AddListItem(childp, parent->children);
}

int	Module_Depend_Resolve(Module *p, char *path)
{
	Mod_SymbolDepTable *d = p->header->symdep;
	Module		   *parental = NULL;
	
	if (d == NULL)
		return 0;
	while (d->pointer)
	{
		if ((*(d->pointer) = Module_SymEx(p->dll, d->symbol)))
		{
			d++;
			continue;
		}
		*(d->pointer) = Module_SymX(d->symbol, &parental);
		if (!*(d->pointer))
		{
			/* If >= 3.2.3 */
			if (p->mod_sys_version >= 0x32300)
			{
				char tmppath[PATH_MAX], curpath[PATH_MAX];

				unreal_getpathname(path, curpath);
				snprintf(tmppath, PATH_MAX, "%s/%s.%s", curpath, d->module,
					MOD_EXTENSION);
				config_progress("Unable to resolve symbol %s, attempting to load %s to find it", d->symbol, tmppath);
				Module_Create(tmppath);
			}
			else
			{
				config_progress("Unable to resolve symbol %s, attempting to load %s to find it", d->symbol, d->module);
				Module_Create(d->module);
			}
			*(d->pointer) = Module_SymX(d->symbol, &parental);
			if (!*(d->pointer)) {
				config_progress("module dependancy error: cannot resolve symbol %s",
					d->symbol);
				return -1;
			}
			
		}
		if (!Module_IsAlreadyChild(parental, p))
			Module_AddAsChild(parental, p);
		d++;	
	}
	return 0;
}

/* m_module.
 * by Stskeeps, codemastr, Syzop.
 * Changed it so it's now public for users too, as quite some people
 * (and users) requested they should have the right to see what kind 
 * of weird modules are loaded on the server, especially since people
 * like to load spy modules these days.
 * I do not consider this sensitive information, but just in case
 * I stripped the version string for non-admins (eg: normal users). -- Syzop
 */
int  m_module(aClient *cptr, aClient *sptr, int parc, char *parv[])
{
	Module          *mi;
	int i;
	char tmp[1024], *p;
	aCommand *mptr;
#ifdef DEBUGMODE
	Efunction *e;
#endif

	if ((parc > 1) && (hunt_server(cptr, sptr, ":%s MODULES :%s", 1, parc, parv) != HUNTED_ISME))
		return 0;
	
	for (mi = Modules; mi; mi = mi->next)
	{
		tmp[0] = '\0';
		if (mi->flags & MODFLAG_DELAYED)
			strncat(tmp, "[Unloading] ", sizeof(tmp)-strlen(tmp)-1);
		if (mi->options & MOD_OPT_PERM_RELOADABLE)
			strncat(tmp, "[PERM-BUT-RELOADABLE] ", sizeof(tmp)-strlen(tmp)-1);
		if (mi->options & MOD_OPT_PERM)
			strncat(tmp, "[PERM] ", sizeof(tmp)-strlen(tmp)-1);
		if (!(mi->options & MOD_OPT_OFFICIAL))
			strncat(tmp, "[3RD] ", sizeof(tmp)-strlen(tmp)-1);
		if (!ValidatePermissionsForPath("server:module",sptr,NULL,NULL,NULL))
			sendto_one(sptr, ":%s NOTICE %s :*** %s (%s)%s", me.name, sptr->name,
				mi->header->name, mi->header->description,
				mi->options & MOD_OPT_OFFICIAL ? "" : " [3RD]");
		else
			sendto_one(sptr, ":%s NOTICE %s :*** %s - %s (%s) %s", me.name, sptr->name,
				mi->header->name, mi->header->version, mi->header->description, tmp);
	}

	if (!ValidatePermissionsForPath("server:module",sptr,NULL,NULL,NULL))
		return 0;

	tmp[0] = '\0';
	p = tmp;
	for (i=0; i < MAXHOOKTYPES; i++)
	{
		if (!Hooks[i])
			continue;
		ircsnprintf(p, sizeof(tmp) - strlen(tmp), "%d ", i);
		p += strlen(p);
		if (p > tmp + 380)
		{
			sendto_one(sptr, ":%s NOTICE %s :Hooks: %s", me.name, sptr->name, tmp);
			tmp[0] = '\0';
			p = tmp;
		}
	}
	sendto_one(sptr, ":%s NOTICE %s :Hooks: %s ", me.name, sptr->name, tmp);

	tmp[0] = '\0';
	p = tmp;
	for (i=0; i < 256; i++)
	{
		for (mptr = CommandHash[i]; mptr; mptr = mptr->next)
			if (mptr->overriders)
			{
				ircsnprintf(p, sizeof(tmp)-strlen(tmp), "%s ", mptr->cmd);
				p += strlen(p);
				if (p > tmp+380)
				{
					sendto_one(sptr, ":%s NOTICE %s :Override: %s", me.name, sptr->name, tmp);
					tmp[0] = '\0';
					p = tmp;
				}
			}
	}
	sendto_one(sptr, ":%s NOTICE %s :Override: %s", me.name, sptr->name, tmp);

#ifdef DEBUGMODE
	sendnotice(sptr, "Efunctions dump:");
	for (i=0; i < MAXEFUNCTIONS; i++)
		if ((e = Efunctions[i]))
		{
			sendnotice(sptr, "type=%d, name=%s, pointer=%p %s, owner=%s",
				e->type,
				efunction_table[e->type].name ? efunction_table[e->type].name : "<null>",
				e->func.voidfunc,
				*efunction_table[e->type].funcptr == e->func.voidfunc ? " [ACTIVE]" : "",
				e->owner ? e->owner->header->name : "<null>");
		}
#endif
	
	return 1;
}

Hooktype *HooktypeFind(char *string) {
	Hooktype *hooktype;
	for (hooktype = Hooktypes; hooktype->string ;hooktype++) {
		if (!stricmp(hooktype->string, string))
			return hooktype;
	}
	return NULL;
}

Versionflag *VersionflagFind(char flag)
{
	Versionflag *vflag;
	for (vflag = Versionflags; vflag; vflag = vflag->next)
	{
		if (vflag->flag == flag)
			return vflag;
	}
	return NULL;
}

Versionflag *VersionflagAdd(Module *module, char flag)
{
	Versionflag *vflag;
	ModuleChild *parent;
	if ((vflag = VersionflagFind(flag)))
	{
		ModuleChild *child;
		for (child = vflag->parents; child; child = child->next) {
			if (child->child == module)
				break;
		}
		if (!child)
		{
			parent = MyMallocEx(sizeof(ModuleChild));
			parent->child = module;
			if (module) {
				ModuleObject *vflagobj;
				vflagobj = MyMallocEx(sizeof(ModuleObject));
				vflagobj->type = MOBJ_VERSIONFLAG;
				vflagobj->object.versionflag = vflag;
				AddListItem(vflagobj, module->objects);
				module->errorcode = MODERR_NOERROR;
			}
			AddListItem(parent,vflag->parents);
		}
		return vflag;
	}
	vflag = MyMallocEx(sizeof(Versionflag));
	vflag->flag = flag;
	parent = MyMallocEx(sizeof(ModuleChild));
	parent->child = module;
	if (module)
	{
		ModuleObject *vflagobj;
		vflagobj = MyMallocEx(sizeof(ModuleObject));
		vflagobj->type = MOBJ_VERSIONFLAG;
		vflagobj->object.versionflag = vflag;
		AddListItem(vflagobj, module->objects);
		module->errorcode = MODERR_NOERROR;
	}
	flag_add(flag);
	AddListItem(parent,vflag->parents);
	AddListItem(vflag, Versionflags);
	return vflag;
}
	
void VersionflagDel(Versionflag *vflag, Module *module)
{
	ModuleChild *owner;
	if (!vflag)
		return;

	for (owner = vflag->parents; owner; owner = owner->next)
	{
		if (owner->child == module)
		{
			DelListItem(owner,vflag->parents);
			MyFree(owner);
			break;
		}
	}
	if (module)
	{
		ModuleObject *objs;
		for (objs = module->objects; objs; objs = objs->next) {
			if (objs->type == MOBJ_VERSIONFLAG && objs->object.versionflag == vflag) {
				DelListItem(objs,module->objects);
				MyFree(objs);
				break;
			}
		}
	}
	if (!vflag->parents)
	{
		flag_del(vflag->flag);
		DelListItem(vflag, Versionflags);
		MyFree(vflag);
	}
}

#if 0
Hooktype *HooktypeAdd(Module *module, char *string, int *type) {
	Hooktype *hooktype;
	int i;
	ModuleChild *parent;
	ModuleObject *hooktypeobj;
	if ((hooktype = HooktypeFind(string))) {
		ModuleChild *child;
		for (child = hooktype->parents; child; child = child->next) {
			if (child->child == module)
				break;
		}
		if (!child) {
			parent = MyMallocEx(sizeof(ModuleChild));
			parent->child = module;
			if (module) {
				hooktypeobj = MyMallocEx(sizeof(ModuleObject));
				hooktypeobj->type = MOBJ_HOOKTYPE;
				hooktypeobj->object.hooktype = hooktype;
				AddListItem(hooktypeobj, module->objects);
				module->errorcode = MODERR_NOERROR;
			}
			AddListItem(parent,hooktype->parents);
		}
		*type = hooktype->id;
		return hooktype;
	}
	for (hooktype = Hooktypes, i = 0; hooktype->string; hooktype++, i++) ;

	if (i >= 39)
	{
		if (module)
			module->errorcode = MODERR_NOSPACE;
		return NULL;
	}

	Hooktypes[i].id = i+41;
	Hooktypes[i].string = strdup(string);
	parent = MyMallocEx(sizeof(ModuleChild));
	parent->child = module;
	if (module) {
		hooktypeobj = MyMallocEx(sizeof(ModuleObject));
		hooktypeobj->type = MOBJ_HOOKTYPE;
		hooktypeobj->object.hooktype = &Hooktypes[i];
		AddListItem(hooktypeobj,module->objects);
		module->errorcode = MODERR_NOERROR;
	}
	AddListItem(parent,Hooktypes[i].parents);
	*type = i+41;
	return &Hooktypes[i];
}

void HooktypeDel(Hooktype *hooktype, Module *module) {
	ModuleChild *child;
	ModuleObject *objs;
	for (child = hooktype->parents; child; child = child->next) {
		if (child->child == module) {
			DelListItem(child,hooktype->parents);
			MyFree(child);
			break;
		}
	}
	if (module) {
		for (objs = module->objects; objs; objs = objs->next) {
			if (objs->type == MOBJ_HOOKTYPE && objs->object.hooktype == hooktype) {
				DelListItem(objs,module->objects);
				MyFree(objs);
				break;
			}
		}
	}
	if (!hooktype->parents) {
		MyFree(hooktype->string);
		hooktype->string = NULL;
		hooktype->id = 0;
		hooktype->parents = NULL;
	}
}
#endif		
	
Hook *HookAddMain(Module *module, int hooktype, int priority, int (*func)(), void (*vfunc)(), char *(*cfunc)())
{
	Hook *p;
	
	p = (Hook *) MyMallocEx(sizeof(Hook));
	if (func)
		p->func.intfunc = func;
	if (vfunc)
		p->func.voidfunc = vfunc;
	if (cfunc)
		p->func.pcharfunc = cfunc;
	p->type = hooktype;
	p->owner = module;
	p->priority = priority;

	if (module) {
		ModuleObject *hookobj = (ModuleObject *)MyMallocEx(sizeof(ModuleObject));
		hookobj->object.hook = p;
		hookobj->type = MOBJ_HOOK;
		AddListItem(hookobj, module->objects);
		module->errorcode = MODERR_NOERROR;
	}
	
	AddListItemPrio(p, Hooks[hooktype], p->priority);

	return p;
}

Hook *HookDel(Hook *hook)
{
	Hook *p, *q;
	for (p = Hooks[hook->type]; p; p = p->next) {
		if (p == hook) {
			q = p->next;
			DelListItem(p, Hooks[hook->type]);
			if (p->owner) {
				ModuleObject *hookobj;
				for (hookobj = p->owner->objects; hookobj; hookobj = hookobj->next) {
					if (hookobj->type == MOBJ_HOOK && hookobj->object.hook == p) {
						DelListItem(hookobj, hook->owner->objects);
						MyFree(hookobj);
						break;
					}
				}
			}
			MyFree(p);
			return q;
		}
	}
	return NULL;
}

Callback	*CallbackAddMain(Module *module, int cbtype, int (*func)(), void (*vfunc)(), char *(*cfunc)())
{
	Callback *p;
	
	p = (Callback *) MyMallocEx(sizeof(Callback));
	if (func)
		p->func.intfunc = func;
	if (vfunc)
		p->func.voidfunc = vfunc;
	if (cfunc)
		p->func.pcharfunc = cfunc;
	p->type = cbtype;
	p->owner = module;
	AddListItem(p, Callbacks[cbtype]);
	if (module) {
		ModuleObject *cbobj = (ModuleObject *)MyMallocEx(sizeof(ModuleObject));
		cbobj->object.callback = p;
		cbobj->type = MOBJ_CALLBACK;
		AddListItem(cbobj, module->objects);
		module->errorcode = MODERR_NOERROR;
	}
	return p;
}

Callback *CallbackDel(Callback *cb)
{
	Callback *p, *q;
	for (p = Callbacks[cb->type]; p; p = p->next) {
		if (p == cb) {
			q = p->next;
			DelListItem(p, Callbacks[cb->type]);
			if (RCallbacks[cb->type] == p)
				RCallbacks[cb->type] = NULL;
			if (p->owner) {
				ModuleObject *cbobj;
				for (cbobj = p->owner->objects; cbobj; cbobj = cbobj->next) {
					if ((cbobj->type == MOBJ_CALLBACK) && (cbobj->object.callback == p)) {
						DelListItem(cbobj, cb->owner->objects);
						MyFree(cbobj);
						break;
					}
				}
			}
			MyFree(p);
			return q;
		}
	}
	return NULL;
}

Efunction	*EfunctionAddMain(Module *module, int eftype, int (*func)(), void (*vfunc)(), void *(*pvfunc)(), char *(*cfunc)())
{
Efunction *p;

	if (!module || !(module->options & MOD_OPT_OFFICIAL))
	{
		module->errorcode = MODERR_INVALID;
		return NULL;
	}
	
	p = (Efunction *) MyMallocEx(sizeof(Efunction));
	if (func)
		p->func.intfunc = func;
	if (vfunc)
		p->func.voidfunc = vfunc;
	if (pvfunc)
		p->func.pvoidfunc = pvfunc;
	if (cfunc)
		p->func.pcharfunc = cfunc;
	p->type = eftype;
	p->owner = module;
	AddListItem(p, Efunctions[eftype]);
	if (module) {
		ModuleObject *cbobj = (ModuleObject *)MyMallocEx(sizeof(ModuleObject));
		cbobj->object.efunction = p;
		cbobj->type = MOBJ_EFUNCTION;
		AddListItem(cbobj, module->objects);
		module->errorcode = MODERR_NOERROR;
	}
	return p;
}

Efunction *EfunctionDel(Efunction *cb)
{
Efunction *p, *q;
	for (p = Efunctions[cb->type]; p; p = p->next) {
		if (p == cb) {
			q = p->next;
			DelListItem(p, Efunctions[cb->type]);
			if (*efunction_table[cb->type].funcptr == p)
				*efunction_table[cb->type].funcptr = NULL;
			if (p->owner) {
				ModuleObject *cbobj;
				for (cbobj = p->owner->objects; cbobj; cbobj = cbobj->next) {
					if ((cbobj->type == MOBJ_EFUNCTION) && (cbobj->object.efunction == p)) {
						DelListItem(cbobj, cb->owner->objects);
						MyFree(cbobj);
						break;
					}
				}
			}
			MyFree(p);
			return q;
		}
	}
	return NULL;
}

Cmdoverride *CmdoverrideAdd(Module *module, char *name, iFP function)
{
	aCommand *p;
	Cmdoverride *ovr;
	
	if (!(p = find_Command_simple(name)))
	{
		if (module)
			module->errorcode = MODERR_NOTFOUND;
		return NULL;
	}
	for (ovr=p->overriders; ovr; ovr=ovr->next)
	{
		if ((ovr->owner == module) && (ovr->func == function))
		{
			if (module)
				module->errorcode = MODERR_EXISTS;
			return NULL;
		}
	}
	ovr = MyMallocEx(sizeof(Cmdoverride));
	ovr->func = function;
	ovr->owner = module; /* TODO: module objects */
	if (module)
	{
		ModuleObject *cmdoverobj = MyMallocEx(sizeof(ModuleObject));
		cmdoverobj->type = MOBJ_CMDOVERRIDE;
		cmdoverobj->object.cmdoverride = ovr;
		AddListItem(cmdoverobj, module->objects);
		module->errorcode = MODERR_NOERROR;
	}
	ovr->command = p;
	if (!p->overriders)
		p->overridetail = ovr;
	AddListItem(ovr, p->overriders);
	if (p->friend)
	{
		if (!p->friend->overriders)
			p->friend->overridetail = ovr;
		AddListItem(ovr, p->friend->overriders);
	}
	return ovr;
}

void CmdoverrideDel(Cmdoverride *cmd)
{
	if (!cmd->next)
		cmd->command->overridetail = cmd->prev;
	DelListItem(cmd, cmd->command->overriders);
	if (!cmd->command->overriders)
		cmd->command->overridetail = NULL;
	if (cmd->command->friend)
	{
		if (!cmd->prev)
			cmd->command->friend->overridetail = NULL;
		DelListItem(cmd, cmd->command->friend->overriders);
	}
	if (cmd->owner)
	{
		ModuleObject *obj;
		for (obj = cmd->owner->objects; obj; obj = obj->next)
		{
			if (obj->type != MOBJ_CMDOVERRIDE)
				continue;
			if (obj->object.cmdoverride == cmd)
			{
				DelListItem(obj, cmd->owner->objects);
				MyFree(obj);
				break;
			}
		}
	}
	MyFree(cmd);
}

int CallCmdoverride(Cmdoverride *ovr, aClient *cptr, aClient *sptr, int parc, char *parv[])
{
	if (ovr->prev)
		return ovr->prev->func(ovr->prev, cptr, sptr, parc, parv);
	return ovr->command->func(cptr, sptr, parc, parv);
}

EVENT(e_unload_module_delayed)
{
	char	*name = strdup(data);
	int	i; 
	i = Module_Unload(name);
	if (i == -1)
	{
		sendto_realops("Failed to unload '%s'", name);
	}
	if (i == 1)
	{
		sendto_realops("Unloaded module %s", name);
	}
	free(name);
	return;
}

void	unload_all_modules(void)
{
	Module *m;
	int	(*Mod_Unload)();
	for (m = Modules; m; m = m->next)
	{
		irc_dlsym(m->dll, "Mod_Unload", Mod_Unload);
		if (Mod_Unload)
			(*Mod_Unload)(m->modinfo);
		remove(m->tmp_file);
	}
}

unsigned int ModuleSetOptions(Module *module, unsigned int options, int action)
{
	unsigned int oldopts = module->options;

	if (action)
        	module->options |= options;
        else
        	module->options &= ~options;
	return oldopts;
}

unsigned int ModuleGetOptions(Module *module)
{
	return module->options;
}

unsigned int ModuleGetError(Module *module)
{
	return module->errorcode;
}

static const char *module_error_str[] = {
	"No error",
	"Object already exists",
	"No space available",
	"Invalid parameter(s)",
	"Object was not found"
};

const char *ModuleGetErrorStr(Module *module)
{
	if (module->errorcode >= sizeof(module_error_str)/sizeof(module_error_str[0]))
		return NULL;

	return module_error_str[module->errorcode];
}

static int num_callbacks(int cbtype)
{
Callback *e;
int cnt = 0;

	for (e = Callbacks[cbtype]; e; e = e->next)
		if (!e->willberemoved)
			cnt++;
			
	return cnt;
}

/** Ensure that all required callbacks are in place and meet
 * all specified requirements
 */
int callbacks_check(void)
{
int i;

	for (i=0; i < MAXCALLBACKS; i++)
	{
		if (num_callbacks(i) > 1)
		{
			config_error("ERROR: Multiple callbacks loaded for type %d. "
			             "Make sure you only load 1 module of 1 type (eg: only 1 cloaking module)",
			             i); /* TODO: make more clear? */
			return -1;
		}
	}
		
	return 0;
}

void callbacks_switchover(void)
{
Callback *e;
int i;

	/* Now set the real callback, and tag the new one
	 * as 'willberemoved' if needed.
	 */

	for (i=0; i < MAXCALLBACKS; i++)
		for (e = Callbacks[i]; e; e = e->next)
			if (!e->willberemoved)
			{
				RCallbacks[i] = e; /* This is the new one. */
				if (!(e->owner->options & MOD_OPT_PERM))
					e->willberemoved = 1;
				break;
			}
}

static int num_efunctions(int eftype)
{
Efunction *e;
int cnt = 0;

#ifdef DEBUGMODE
	if ((eftype < 0) || (eftype >= MAXEFUNCTIONS))
		abort();
#endif

	for (e = Efunctions[eftype]; e; e = e->next)
		if (!e->willberemoved)
			cnt++;
			
	return cnt;
}


/** Ensure that all efunctions are present. */
int efunctions_check(void)
{
int i, n, errors=0;

	for (i=0; i < MAXEFUNCTIONS; i++)
		if (efunction_table[i].name)
		{
			n = num_efunctions(i);
			if ((n != 1) && (errors > 10))
			{
				config_error("[--efunction errors truncated to prevent flooding--]");
				break;
			}
			if (n < 1)
			{
				config_error("ERROR: efunction '%s' not found, you probably did not "
				             "load all required modules! (hint: see modules.default.conf)",
				             efunction_table[i].name);
				errors++;
			} else
			if (n > 1)
			{
				config_error("ERROR: efunction '%s' was found %d times, perhaps you "
				             "loaded a module multiple times??",
				             efunction_table[i].name, n);
				errors++;
			}
		}
	return errors ? -1 : 0;
}

void efunctions_switchover(void)
{
Efunction *e;
int i;

	/* Now set the real efunction, and tag the new one
	 * as 'willberemoved' if needed.
	 */

	for (i=0; i < MAXEFUNCTIONS; i++)
		for (e = Efunctions[i]; e; e = e->next)
			if (!e->willberemoved)
			{
				*efunction_table[i].funcptr = e->func.voidfunc;  /* This is the new one. */
				if (!(e->owner->options & MOD_OPT_PERM))
					e->willberemoved = 1;
				break;
			}
}

#ifdef _WIN32
const char *our_dlerror(void)
{
	static char errbuf[513];
	DWORD err = GetLastError();
	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err,
		0, errbuf, 512, NULL);
	if (err == 126) /* FIXME: find the correct code for 126  */
		strlcat(errbuf, " This could be because the DLL depends on another DLL, for example if you "
		               "are trying to load a 3rd party module which was compiled with a different compiler version.",
		               sizeof(errbuf));
	return errbuf;
}
#endif
