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/*
* loader.c - load platform dependent DSO containing freebl implementation.
*
* 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/. */
#define _GNU_SOURCE 1
#include "loader.h"
#include "prmem.h"
#include "prerror.h"
#include "prinit.h"
#include "prenv.h"
#include "blname.c"
#include "prio.h"
#include "prprf.h"
#include <stdio.h>
#include "prsystem.h"
#include "nsslowhash.h"
#include <dlfcn.h>
#include "pratom.h"
static PRLibrary *blLib;
#define LSB(x) ((x)&0xff)
#define MSB(x) ((x) >> 8)
static const NSSLOWVector *vector;
static const char *libraryName = NULL;
/* pretty much only glibc uses this, make sure we don't have any depenencies
* on nspr.. */
#undef PORT_Alloc
#undef PORT_Free
#define PORT_Alloc malloc
#define PR_Malloc malloc
#define PORT_Free free
#define PR_Free free
#define PR_GetDirectorySeparator() '/'
#define PR_LoadLibraryWithFlags(libspec, flags) \
(PRLibrary *)dlopen(libSpec.value.pathname, RTLD_NOW | RTLD_LOCAL)
#define PR_GetLibraryFilePathname(name, addr) \
freebl_lowhash_getLibraryFilePath(addr)
static char *
freebl_lowhash_getLibraryFilePath(void *addr)
{
Dl_info dli;
if (dladdr(addr, &dli) == 0) {
return NULL;
}
return strdup(dli.dli_fname);
}
/*
* The PR_LoadLibraryWithFlags call above defines this variable away, so we
* don't need it..
*/
#ifdef nodef
static const char *NameOfThisSharedLib =
SHLIB_PREFIX "freebl" SHLIB_VERSION "." SHLIB_SUFFIX;
#endif
#include "genload.c"
/* This function must be run only once. */
/* determine if hybrid platform, then actually load the DSO. */
static PRStatus
freebl_LoadDSO(void)
{
PRLibrary *handle;
const char *name = getLibName();
if (!name) {
/*PR_SetError(PR_LOAD_LIBRARY_ERROR,0); */
return PR_FAILURE;
}
handle = loader_LoadLibrary(name);
if (handle) {
void *address = dlsym(handle, "NSSLOW_GetVector");
if (address) {
NSSLOWGetVectorFn *getVector = (NSSLOWGetVectorFn *)address;
const NSSLOWVector *dsoVector = getVector();
if (dsoVector) {
unsigned short dsoVersion = dsoVector->version;
unsigned short myVersion = NSSLOW_VERSION;
if (MSB(dsoVersion) == MSB(myVersion) &&
LSB(dsoVersion) >= LSB(myVersion) &&
dsoVector->length >= sizeof(NSSLOWVector)) {
vector = dsoVector;
libraryName = name;
blLib = handle;
return PR_SUCCESS;
}
}
}
(void)dlclose(handle);
}
return PR_FAILURE;
}
static PRCallOnceType loadFreeBLOnce;
static void
freebl_RunLoaderOnce(void)
{
/* Don't have NSPR, so can use the real PR_CallOnce, implement a stripped
* down version. */
if (loadFreeBLOnce.initialized) {
return;
}
if (__sync_lock_test_and_set(&loadFreeBLOnce.inProgress, 1) == 0) {
loadFreeBLOnce.status = freebl_LoadDSO();
loadFreeBLOnce.initialized = 1;
} else {
/* shouldn't have a lot of takers on the else clause, which is good
* since we don't have condition variables yet.
* 'initialized' only ever gets set (not cleared) so we don't
* need the traditional locks. */
while (!loadFreeBLOnce.initialized) {
sleep(1); /* don't have condition variables, just give up the CPU */
}
}
}
static const NSSLOWVector *
freebl_InitVector(void)
{
if (!vector) {
freebl_RunLoaderOnce();
}
return vector;
}
const FREEBLVector *
FREEBL_GetVector(void)
{
if (freebl_InitVector()) {
return (vector->p_FREEBL_GetVector)();
}
return NULL;
}
NSSLOWInitContext *
NSSLOW_Init(void)
{
if (freebl_InitVector()) {
return (vector->p_NSSLOW_Init)();
}
return NULL;
}
void
NSSLOW_Shutdown(NSSLOWInitContext *context)
{
if (freebl_InitVector()) {
(vector->p_NSSLOW_Shutdown)(context);
}
}
void
NSSLOW_Reset(NSSLOWInitContext *context)
{
if (freebl_InitVector()) {
(vector->p_NSSLOW_Reset)(context);
}
}
NSSLOWHASHContext *
NSSLOWHASH_NewContext(
NSSLOWInitContext *initContext,
HASH_HashType hashType)
{
if (freebl_InitVector()) {
return (vector->p_NSSLOWHASH_NewContext)(initContext, hashType);
}
return NULL;
}
void
NSSLOWHASH_Begin(NSSLOWHASHContext *context)
{
if (freebl_InitVector()) {
(vector->p_NSSLOWHASH_Begin)(context);
}
}
void
NSSLOWHASH_Update(NSSLOWHASHContext *context,
const unsigned char *buf,
unsigned int len)
{
if (freebl_InitVector()) {
(vector->p_NSSLOWHASH_Update)(context, buf, len);
}
}
void
NSSLOWHASH_End(NSSLOWHASHContext *context,
unsigned char *buf,
unsigned int *ret, unsigned int len)
{
if (freebl_InitVector()) {
(vector->p_NSSLOWHASH_End)(context, buf, ret, len);
}
}
void
NSSLOWHASH_Destroy(NSSLOWHASHContext *context)
{
if (freebl_InitVector()) {
(vector->p_NSSLOWHASH_Destroy)(context);
}
}
unsigned int
NSSLOWHASH_Length(NSSLOWHASHContext *context)
{
if (freebl_InitVector()) {
return (vector->p_NSSLOWHASH_Length)(context);
}
return -1;
}
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