mirror of
https://github.com/rn10950/RetroZilla.git
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183 lines
6.1 KiB
C
183 lines
6.1 KiB
C
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "secport.h"
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#include "nspr.h"
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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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#ifdef PR_LD_ALT_SEARCH_PATH
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/* allow library's dependencies to be found in the same directory
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* on Windows even if PATH is not set. Requires NSPR 4.8.1 . */
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| PR_LD_ALT_SEARCH_PATH
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#endif
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);
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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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* Load a shared library called "newShLibName" in the same directory as
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* a shared library that is already loaded, called existingShLibName.
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* A pointer to a static function in that shared library,
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* staticShLibFunc, is required.
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*
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* existingShLibName:
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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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* staticShLibFunc:
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* Pointer to a static function in the "reference library".
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*
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* newShLibName:
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* The simple file name of the new shared library to be loaded.
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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
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* PR_LoadLibraryWithFlags with an absolute pathname for the shared
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* library to be loaded.
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*
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* On Windows, the "alternate search path" strategy is employed, if available.
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* On Unix, if existingShLibName is a symbolic link, and no link exists for the
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* new library, the original link will be resolved, and the new library loaded
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* from the resolved location.
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*
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* If the new shared library is not found in the same location as the reference
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* library, it will then be loaded from the normal system library path.
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*
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*/
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PRLibrary *
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PORT_LoadLibraryFromOrigin(const char* existingShLibName,
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PRFuncPtr staticShLibFunc,
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const char *newShLibName)
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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 existingShLibName, e.g. /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.
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* We require the address of a function in the "reference library",
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* provided by the caller. To avoid getting the address of the stub/thunk
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* of an exported function by accident, use the address of a static
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* function rather than an exported function.
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*/
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fullPath = PR_GetLibraryFilePathname(existingShLibName,
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staticShLibFunc);
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if (fullPath) {
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lib = loader_LoadLibInReferenceDir(fullPath, newShLibName);
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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, newShLibName);
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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", newShLibName);
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#endif
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libSpec.type = PR_LibSpec_Pathname;
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libSpec.value.pathname = newShLibName;
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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", newShLibName);
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#endif
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}
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return lib;
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}
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