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192 lines
6.5 KiB
C
192 lines
6.5 KiB
C
/*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Dr Vipul Gupta <vipul.gupta@sun.com>, Sun Microsystems Laboratories
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* Kai Engert <kengert@redhat.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* This file is meant to be included by other .c files.
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* This file takes a "parameter", the scope which includes this
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* code shall declare this variable:
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* const char *NameOfThisSharedLib;
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*
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* NameOfThisSharedLib:
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* The file name of the shared library that shall be used as the
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* "reference library". The loader will attempt to load the requested
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* library from the same directory as the reference library.
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*/
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#ifdef XP_UNIX
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#include <unistd.h>
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#define BL_MAXSYMLINKS 20
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/*
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* If 'link' is a symbolic link, this function follows the symbolic links
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* and returns the pathname of the ultimate source of the symbolic links.
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* If 'link' is not a symbolic link, this function returns NULL.
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* The caller should call PR_Free to free the string returned by this
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* function.
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*/
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static char* loader_GetOriginalPathname(const char* link)
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{
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char* resolved = NULL;
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char* input = NULL;
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PRUint32 iterations = 0;
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PRInt32 len = 0, retlen = 0;
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if (!link) {
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PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
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return NULL;
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}
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len = PR_MAX(1024, strlen(link) + 1);
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resolved = PR_Malloc(len);
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input = PR_Malloc(len);
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if (!resolved || !input) {
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if (resolved) {
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PR_Free(resolved);
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}
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if (input) {
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PR_Free(input);
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}
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return NULL;
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}
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strcpy(input, link);
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while ( (iterations++ < BL_MAXSYMLINKS) &&
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( (retlen = readlink(input, resolved, len - 1)) > 0) ) {
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char* tmp = input;
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resolved[retlen] = '\0'; /* NULL termination */
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input = resolved;
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resolved = tmp;
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}
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PR_Free(resolved);
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if (iterations == 1 && retlen < 0) {
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PR_Free(input);
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input = NULL;
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}
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return input;
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}
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#endif /* XP_UNIX */
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/*
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* Load the library with the file name 'name' residing in the same
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* directory as the reference library, whose pathname is 'referencePath'.
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*/
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static PRLibrary *
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loader_LoadLibInReferenceDir(const char *referencePath, const char *name)
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{
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PRLibrary *dlh = NULL;
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char *fullName = NULL;
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char* c;
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PRLibSpec libSpec;
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/* Remove the trailing filename from referencePath and add the new one */
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c = strrchr(referencePath, PR_GetDirectorySeparator());
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if (c) {
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size_t referencePathSize = 1 + c - referencePath;
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fullName = (char*) PORT_Alloc(strlen(name) + referencePathSize + 1);
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if (fullName) {
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memcpy(fullName, referencePath, referencePathSize);
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strcpy(fullName + referencePathSize, name);
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#ifdef DEBUG_LOADER
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PR_fprintf(PR_STDOUT, "\nAttempting to load fully-qualified %s\n",
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fullName);
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#endif
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libSpec.type = PR_LibSpec_Pathname;
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libSpec.value.pathname = fullName;
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dlh = PR_LoadLibraryWithFlags(libSpec, PR_LD_NOW | PR_LD_LOCAL);
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PORT_Free(fullName);
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}
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}
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return dlh;
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}
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/*
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* We use PR_GetLibraryFilePathname to get the pathname of the loaded
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* shared lib that contains this function, and then do a PR_LoadLibrary
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* with an absolute pathname for the softoken shared library.
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*/
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static PRLibrary *
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loader_LoadLibrary(const char *nameToLoad)
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{
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PRLibrary *lib = NULL;
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char* fullPath = NULL;
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PRLibSpec libSpec;
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/* Get the pathname for nameOfAlreadyLoadedLib, i.e. /usr/lib/libnss3.so
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* PR_GetLibraryFilePathname works with either the base library name or a
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* function pointer, depending on the platform. We can't query an exported
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* symbol such as NSC_GetFunctionList, because on some platforms we can't
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* find symbols in loaded implicit dependencies.
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* But we can just get the address of this function !
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*/
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fullPath = PR_GetLibraryFilePathname(NameOfThisSharedLib,
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(PRFuncPtr)&loader_LoadLibrary);
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if (fullPath) {
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lib = loader_LoadLibInReferenceDir(fullPath, nameToLoad);
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#ifdef XP_UNIX
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if (!lib) {
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/*
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* If fullPath is a symbolic link, resolve the symbolic
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* link and try again.
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*/
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char* originalfullPath = loader_GetOriginalPathname(fullPath);
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if (originalfullPath) {
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PR_Free(fullPath);
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fullPath = originalfullPath;
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lib = loader_LoadLibInReferenceDir(fullPath, nameToLoad);
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}
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}
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#endif
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PR_Free(fullPath);
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}
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if (!lib) {
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#ifdef DEBUG_LOADER
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PR_fprintf(PR_STDOUT, "\nAttempting to load %s\n", nameToLoad);
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#endif
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libSpec.type = PR_LibSpec_Pathname;
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libSpec.value.pathname = nameToLoad;
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lib = PR_LoadLibraryWithFlags(libSpec, PR_LD_NOW | PR_LD_LOCAL);
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}
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if (NULL == lib) {
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#ifdef DEBUG_LOADER
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PR_fprintf(PR_STDOUT, "\nLoading failed : %s.\n", nameToLoad);
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#endif
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}
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return lib;
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}
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