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/*
Copyright (C) (2004 - 2006) (Venkata Ramana Enaganti) <ramana@intraperson.com>
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 2 of the License, 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.
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <ltdl.h>
#include "msg.h"
#include "autodir.h"
#include "module.h"
#define SYMBOL_MODULE_INIT "module_init"
#define SYMBOL_MODULE_DIR "module_dir"
#define SYMBOL_MODULE_DOWORK "module_dowork"
#define SYMBOL_MODULE_CLEAN "module_clean"
/* for loading requested module from command line option*/
/* module callbacks*/
static struct {
lt_dlhandle handle;
/*command line args*/
char *mod_path;
char *mod_subopt;
} module;
static module_info *modinfo;
module_info *(*mod_init)( char *, const char * );
void (*mod_dir)( char *, int , const char * );
int (*mod_dowork)( const char *, const char *, char *, int );
void (*mod_clean)( void );
/***************************************************
ltdl is not made thread safe because,
ltdl library calls are made from only single thread
************* **************************************/
static lt_ptr module_symbol( const char *sname )
{
lt_ptr ptr;
ptr = lt_dlsym( module.handle, sname );
if( ! ptr )
msglog( MSG_FATAL, "'%s' symbol not defined in module %s",
sname, module.mod_path );
return ptr;
}
static void module_check( void )
{
struct stat st;
if( stat( module.mod_path, &st ) )
{
if( errno == ENOENT || errno == ENOTDIR )
msglog( MSG_FATAL, "could not find module at %s",
module.mod_path );
else msglog( MSG_FATAL|LOG_ERRNO, "module_check: stat" );
}
if( ! S_ISREG(st.st_mode) )
msglog( MSG_FATAL, "module %s is not regular file",
module.mod_path );
if( st.st_mode & S_IWOTH )
msglog( MSG_FATAL, "module %s has world write permissions",
module.mod_path );
if( st.st_uid != 0 )
msglog( MSG_FATAL, "module %s is not owned by root",
module.mod_path );
}
static void module_clean( void )
{
if( module.handle )
lt_dlclose( module.handle );
}
void module_load( char *apath )
{
module.handle = 0;
module_check();
if( atexit( module_clean ) )
msglog( MSG_FATAL, "could not register module cleanup method" );
if( lt_dlinit() )
msglog( MSG_FATAL, "module_load: lt_dlinit: %s", lt_dlerror() );
if( ! ( module.handle = lt_dlopenext( module.mod_path ) ) )
msglog( MSG_FATAL, "module open error: %s", lt_dlerror() );
mod_init = module_symbol( SYMBOL_MODULE_INIT );
mod_dir = module_symbol( SYMBOL_MODULE_DIR );
mod_dowork = module_symbol( SYMBOL_MODULE_DOWORK );
mod_clean = module_symbol( SYMBOL_MODULE_CLEAN );
if( ! ( modinfo = mod_init( module.mod_subopt, apath ) ) )
msglog( MSG_FATAL, "could not initialize module" );
if( modinfo->protocol != MODULE_PROTOCOL_SUPPORTED)
msglog( MSG_FATAL, "required protocol '%d', " \
"module protocol '%d' not supported",
MODULE_PROTOCOL_SUPPORTED, modinfo->protocol);
if( ! modinfo->name )
msglog( MSG_FATAL, "missing module name info" );
msglog( MSG_INFO, "module %s loaded from %s",
modinfo->name, module.mod_path );
}
const char *module_name( void )
{
return modinfo->name;
}
/*************** option handling functions *****************/
void module_option_modpath( char ch, char *arg, int valid )
{
if( ! valid )
msglog( MSG_FATAL, "module option -%c missing", ch );
if( ! arg || arg[ 0 ] != '/' )
msglog( MSG_FATAL, "module option -%c argument " \
"is not absolute path", ch );
module.mod_path = arg;
}
void module_option_modopt( char ch, char *arg, int valid )
{
module.mod_subopt = valid ? arg : NULL;
}
/*************** end of option handling functions *****************/
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