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101 lines
2.1 KiB
101 lines
2.1 KiB
/* module.c - helper for dynamically loading crypto module */
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/*
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* Copyright 2020-2021 Howard Chu, Symas Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the Symas
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* Dual-Use License.
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*
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* A copy of this license is available in the file LICENSE in the
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* source distribution.
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*/
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <dlfcn.h>
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#endif
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#include <stddef.h>
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#include <string.h>
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#include "lmdb.h"
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#include "module.h"
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void *mlm_load(const char *file, const char *name, MDB_crypto_funcs **mcf_ptr, char **errmsg)
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{
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MDB_crypto_hooks *hookfunc;
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void *ret = NULL;
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if (!name)
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name = "MDB_crypto";
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#ifdef _WIN32
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{
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HINSTANCE mlm = LoadLibrary(file);
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if (mlm) {
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hookfunc = GetProcAddress(mlm, name);
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if (hookfunc)
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*mcf_ptr = hookfunc();
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else {
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*errmsg = "Crypto hook function not found";
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FreeLibrary(mlm);
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mlm = NULL;
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}
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} else {
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*errmsg = GetLastError();
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}
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ret = (void *)mlm;
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}
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#else
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{
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void *mlm = dlopen(file, RTLD_NOW);
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if (mlm) {
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hookfunc = dlsym(mlm, name);
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if (hookfunc)
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*mcf_ptr = hookfunc();
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else {
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*errmsg = "Crypto hook function not found";
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dlclose(mlm);
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mlm = NULL;
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}
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} else {
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*errmsg = dlerror();
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}
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ret = mlm;
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}
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#endif
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return ret;
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}
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void mlm_unload(void *mlm)
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{
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#ifdef _WIN32
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FreeLibrary((HINSTANCE)mlm);
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#else
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dlclose(mlm);
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#endif
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}
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void *mlm_setup(MDB_env *env, const char *file, const char *password, char **errmsg)
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{
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MDB_crypto_funcs *cf;
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MDB_val enckey = {0};
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void *mlm = mlm_load(file, NULL, &cf, errmsg);
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if (mlm) {
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if (cf->mcf_sumfunc) {
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mdb_env_set_checksum(env, cf->mcf_sumfunc, cf->mcf_sumsize);
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}
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if (cf->mcf_encfunc && password) {
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char keybuf[2048];
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enckey.mv_data = keybuf;
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enckey.mv_size = cf->mcf_keysize;
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if (cf->mcf_str2key)
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cf->mcf_str2key(password, &enckey);
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else
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strncpy(enckey.mv_data, password, enckey.mv_size);
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mdb_env_set_encrypt(env, cf->mcf_encfunc, &enckey, cf->mcf_esumsize);
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memset(enckey.mv_data, 0, enckey.mv_size);
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}
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}
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return mlm;
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}
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