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-rw-r--r--security/nss/lib/freebl/genload.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/security/nss/lib/freebl/genload.c b/security/nss/lib/freebl/genload.c
new file mode 100644
index 000000000..832deb58c
--- /dev/null
+++ b/security/nss/lib/freebl/genload.c
@@ -0,0 +1,167 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This file is meant to be included by other .c files.
+ * This file takes a "parameter", the scope which includes this
+ * code shall declare this variable:
+ * const char *NameOfThisSharedLib;
+ *
+ * NameOfThisSharedLib:
+ * The file name of the shared library that shall be used as the
+ * "reference library". The loader will attempt to load the requested
+ * library from the same directory as the reference library.
+ */
+
+#ifdef XP_UNIX
+#include <unistd.h>
+#define BL_MAXSYMLINKS 20
+
+/*
+ * If 'link' is a symbolic link, this function follows the symbolic links
+ * and returns the pathname of the ultimate source of the symbolic links.
+ * If 'link' is not a symbolic link, this function returns NULL.
+ * The caller should call PR_Free to free the string returned by this
+ * function.
+ */
+static char*
+loader_GetOriginalPathname(const char* link)
+{
+#ifdef __GLIBC__
+ char* tmp = realpath(link, NULL);
+ char* resolved;
+ if (!tmp)
+ return NULL;
+ resolved = PR_Malloc(strlen(tmp) + 1);
+ strcpy(resolved, tmp); /* This is necessary because PR_Free might not be using free() */
+ free(tmp);
+ return resolved;
+#else
+ char* resolved = NULL;
+ char* input = NULL;
+ PRUint32 iterations = 0;
+ PRInt32 len = 0, retlen = 0;
+ if (!link) {
+ PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+ return NULL;
+ }
+ len = PR_MAX(1024, strlen(link) + 1);
+ resolved = PR_Malloc(len);
+ input = PR_Malloc(len);
+ if (!resolved || !input) {
+ if (resolved) {
+ PR_Free(resolved);
+ }
+ if (input) {
+ PR_Free(input);
+ }
+ return NULL;
+ }
+ strcpy(input, link);
+ while ((iterations++ < BL_MAXSYMLINKS) &&
+ ((retlen = readlink(input, resolved, len - 1)) > 0)) {
+ char* tmp = input;
+ resolved[retlen] = '\0'; /* NULL termination */
+ input = resolved;
+ resolved = tmp;
+ }
+ PR_Free(resolved);
+ if (iterations == 1 && retlen < 0) {
+ PR_Free(input);
+ input = NULL;
+ }
+ return input;
+#endif
+}
+#endif /* XP_UNIX */
+
+/*
+ * Load the library with the file name 'name' residing in the same
+ * directory as the reference library, whose pathname is 'referencePath'.
+ */
+static PRLibrary*
+loader_LoadLibInReferenceDir(const char* referencePath, const char* name)
+{
+ PRLibrary* dlh = NULL;
+ char* fullName = NULL;
+ char* c;
+ PRLibSpec libSpec;
+
+ /* Remove the trailing filename from referencePath and add the new one */
+ c = strrchr(referencePath, PR_GetDirectorySeparator());
+ if (c) {
+ size_t referencePathSize = 1 + c - referencePath;
+ fullName = (char*)PORT_Alloc(strlen(name) + referencePathSize + 1);
+ if (fullName) {
+ memcpy(fullName, referencePath, referencePathSize);
+ strcpy(fullName + referencePathSize, name);
+#ifdef DEBUG_LOADER
+ PR_fprintf(PR_STDOUT, "\nAttempting to load fully-qualified %s\n",
+ fullName);
+#endif
+ libSpec.type = PR_LibSpec_Pathname;
+ libSpec.value.pathname = fullName;
+ dlh = PR_LoadLibraryWithFlags(libSpec, PR_LD_NOW | PR_LD_LOCAL);
+ PORT_Free(fullName);
+ }
+ }
+ return dlh;
+}
+
+/*
+ * We use PR_GetLibraryFilePathname to get the pathname of the loaded
+ * shared lib that contains this function, and then do a PR_LoadLibrary
+ * with an absolute pathname for the softoken shared library.
+ */
+
+static PRLibrary*
+loader_LoadLibrary(const char* nameToLoad)
+{
+ PRLibrary* lib = NULL;
+ char* fullPath = NULL;
+ PRLibSpec libSpec;
+
+ /* Get the pathname for nameOfAlreadyLoadedLib, i.e. /usr/lib/libnss3.so
+ * PR_GetLibraryFilePathname works with either the base library name or a
+ * function pointer, depending on the platform. We can't query an exported
+ * symbol such as NSC_GetFunctionList, because on some platforms we can't
+ * find symbols in loaded implicit dependencies.
+ * But we can just get the address of this function !
+ */
+ fullPath = PR_GetLibraryFilePathname(NameOfThisSharedLib,
+ (PRFuncPtr)&loader_LoadLibrary);
+
+ if (fullPath) {
+ lib = loader_LoadLibInReferenceDir(fullPath, nameToLoad);
+#ifdef XP_UNIX
+ if (!lib) {
+ /*
+ * If fullPath is a symbolic link, resolve the symbolic
+ * link and try again.
+ */
+ char* originalfullPath = loader_GetOriginalPathname(fullPath);
+ if (originalfullPath) {
+ PR_Free(fullPath);
+ fullPath = originalfullPath;
+ lib = loader_LoadLibInReferenceDir(fullPath, nameToLoad);
+ }
+ }
+#endif
+ PR_Free(fullPath);
+ }
+ if (!lib) {
+#ifdef DEBUG_LOADER
+ PR_fprintf(PR_STDOUT, "\nAttempting to load %s\n", nameToLoad);
+#endif
+ libSpec.type = PR_LibSpec_Pathname;
+ libSpec.value.pathname = nameToLoad;
+ lib = PR_LoadLibraryWithFlags(libSpec, PR_LD_NOW | PR_LD_LOCAL);
+ }
+ if (NULL == lib) {
+#ifdef DEBUG_LOADER
+ PR_fprintf(PR_STDOUT, "\nLoading failed : %s.\n", nameToLoad);
+#endif
+ }
+ return lib;
+}