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/** BEGIN COPYRIGHT BLOCK
* 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; version 2 of the License.
*
* 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., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA.
*
* In addition, as a special exception, Red Hat, Inc. gives You the additional
* right to link the code of this Program with code not covered under the GNU
* General Public License ("Non-GPL Code") and to distribute linked combinations
* including the two, subject to the limitations in this paragraph. Non-GPL Code
* permitted under this exception must only link to the code of this Program
* through those well defined interfaces identified in the file named EXCEPTION
* found in the source code files (the "Approved Interfaces"). The files of
* Non-GPL Code may instantiate templates or use macros or inline functions from
* the Approved Interfaces without causing the resulting work to be covered by
* the GNU General Public License. Only Red Hat, Inc. may make changes or
* additions to the list of Approved Interfaces. You must obey the GNU General
* Public License in all respects for all of the Program code and other code used
* in conjunction with the Program except the Non-GPL Code covered by this
* exception. If you modify this file, you may extend this exception to your
* version of the file, but you are not obligated to do so. If you do not wish to
* provide this exception without modification, you must delete this exception
* statement from your version and license this file solely under the GPL without
* exception.
*
*
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
/* dynalib.c - dynamic library routines */
#include <stdio.h>
#include "prlink.h"
#include "slap.h"
#if defined(SOLARIS)
#include <dlfcn.h> /* dlerror */
#endif
static struct dynalib {
char *dl_name;
PRLibrary *dl_handle;
} **libs = NULL;
static void symload_report_error( const char *libpath, char *symbol, char *plugin,
int libopen );
/* construct a full path and name of a plugin
very similar to PR_GetLibraryName except that function inserts
the string "lib" at the beginning of name, making that function
unsuitable for constructing plugin names
*/
static char *get_plugin_name(const char *dir, const char *name);
static void free_plugin_name(char *name)
{
PR_smprintf_free(name);
}
void *
sym_load( char *libpath, char *symbol, char *plugin, int report_errors )
{
return sym_load_with_flags(libpath, symbol, plugin, report_errors, PR_FALSE, PR_FALSE);
}
/* libpath is the pathname from the plugin config entry - it may be an absolute path
or a relative path. It does not have to have the shared lib/dll suffix. The
PR_GetLibraryName function will create the correct library name and path, including
the correct shared library suffix for the platform. So, for example, if you just
pass in "libacl-plugin" as the libpath, and you are running on linux, the code
will first test for the existence of "libacl-plugin", then will construct the full
pathname to load as "PLUGINDIR/libacl-plugin.so" where PLUGINDIR is set during
build time to something like /usr/lib/brand/plugins.
*/
void *
sym_load_with_flags( char *libpath, char *symbol, char *plugin, int report_errors, PRBool load_now, PRBool load_global )
{
int i;
void *handle;
PRLibSpec libSpec;
unsigned int flags = PR_LD_LAZY; /* default PR_LoadLibrary flag */
libSpec.type = PR_LibSpec_Pathname;
libSpec.value.pathname = libpath;
for ( i = 0; libs != NULL && libs[i] != NULL; i++ ) {
if ( strcasecmp( libs[i]->dl_name, libpath ) == 0 ) {
handle = PR_FindSymbol( libs[i]->dl_handle, symbol );
if ( NULL == handle && report_errors ) {
symload_report_error( libpath, symbol, plugin, 1 /* lib open */ );
}
return handle;
}
}
if (load_now) {
flags = PR_LD_NOW;
}
if (load_global) {
flags |= PR_LD_GLOBAL;
}
if (PR_SUCCESS != PR_Access(libpath, PR_ACCESS_READ_OK)) {
libSpec.value.pathname = get_plugin_name(PLUGINDIR, libpath);
/* then just handle that failure case with symload_report_error below */
}
if ( (handle = PR_LoadLibraryWithFlags( libSpec, flags )) == NULL ) {
if ( report_errors ) {
symload_report_error( libSpec.value.pathname, symbol, plugin, 0 /* lib not open */ );
}
if (libSpec.value.pathname != libpath) {
free_plugin_name((char *)libSpec.value.pathname); /* cast ok - allocated by get_plugin_name */
}
return( NULL );
}
libs = (struct dynalib **) slapi_ch_realloc( (char *) libs, (i + 2) *
sizeof(struct dynalib *) );
libs[i] = (struct dynalib *) slapi_ch_malloc( sizeof(struct dynalib) );
libs[i]->dl_name = slapi_ch_strdup( libpath );
libs[i]->dl_handle = handle;
libs[ i + 1 ] = NULL;
handle = PR_FindSymbol( libs[i]->dl_handle, symbol );
if ( NULL == handle && report_errors ) {
symload_report_error( libSpec.value.pathname, symbol, plugin, 1 /* lib open */ );
}
if (libSpec.value.pathname != libpath) {
free_plugin_name((char *)libSpec.value.pathname); /* cast ok - allocated by PR_GetLibraryName */
}
return handle;
}
static void
symload_report_error( const char *libpath, char *symbol, char *plugin, int libopen )
{
char *errtext = NULL;
PRInt32 errlen;
errlen = PR_GetErrorTextLength();
if ( errlen > 0 ) {
errtext = slapi_ch_malloc( errlen+1 );
if ( PR_GetErrorText( errtext ) > 0 ) {
LDAPDebug( LDAP_DEBUG_ANY, SLAPI_COMPONENT_NAME_NSPR " error %d: %s\n",
PR_GetError(), errtext, 0 );
}
slapi_ch_free( (void **)&errtext );
}
if ( libopen ) {
LDAPDebug( LDAP_DEBUG_ANY,
"Could not load symbol \"%s\" from \"%s\" for plugin %s\n",
symbol, libpath, plugin );
} else {
LDAPDebug( LDAP_DEBUG_ANY,
"Could not open library \"%s\" for plugin %s\n",
libpath, plugin, 0 );
}
}
/* PR_GetLibraryName does almost everything we need, and unfortunately
a little bit more - it adds "lib" to be beginning of the library
name if the library name does not end with the current platform
DLL suffix - so
foo.so -> /path/foo.so
libfoo.so -> /path/libfoo.so
BUT
foo -> /path/libfoo.so
libfoo -> /path/liblibfoo.so
*/
static char *
get_plugin_name(const char *path, const char *lib)
{
const char *libstr = "/lib";
size_t libstrlen = 4;
char *fullname = PR_GetLibraryName(path, lib);
char *ptr = PL_strrstr(fullname, lib);
/* see if /lib was added */
if (ptr && ((ptr - fullname) >= libstrlen)) {
/* ptr is at the libname in fullname, and there is something before it */
ptr -= libstrlen; /* ptr now points at the "/" in "/lib" if it is there */
if (0 == PL_strncmp(ptr, libstr, libstrlen)) {
/* just copy the remainder of the string on top of here */
ptr++; /* ptr now points at the "l" in "/lib" - keep the "/" */
memmove(ptr, ptr+3, strlen(ptr+3)+1);
}
}
return fullname;
}
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