/*

 * Copyright 2016-2019 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <openssl/opensslv.h>

#include <openssl/ssl.h>

#include <openssl/ossl_typ.h>

#include "crypto/dso_conf.h"

typedef void DSO;

typedef const SSL_METHOD * (*TLS_method_t)(void);

typedef SSL_CTX * (*SSL_CTX_new_t)(const SSL_METHOD *meth);

typedef void (*SSL_CTX_free_t)(SSL_CTX *);

typedef int (*OPENSSL_init_crypto_t)(uint64_t, void *);

typedef int (*OPENSSL_atexit_t)(void (*handler)(void));

typedef unsigned long (*ERR_get_error_t)(void);

typedef unsigned long (*OpenSSL_version_num_t)(void);

typedef DSO * (*DSO_dsobyaddr_t)(void (*addr)(void), int flags);

typedef int (*DSO_free_t)(DSO *dso);

typedef enum test_types_en {

    CRYPTO_FIRST,

    SSL_FIRST,

    JUST_CRYPTO,

    DSO_REFTEST,

    NO_ATEXIT

} TEST_TYPE;

static TEST_TYPE test_type;

static const char *path_crypto;

static const char *path_ssl;

static const char *path_atexit;

#ifdef DSO_DLFCN

# include <dlfcn.h>

# define SHLIB_INIT NULL

typedef void *SHLIB;

typedef void *SHLIB_SYM;

static int shlib_load(const char *filename, SHLIB *lib)

{

    int dl_flags = (RTLD_GLOBAL|RTLD_LAZY);

#ifdef _AIX

    if (filename[strlen(filename) - 1] == ')')

        dl_flags |= RTLD_MEMBER;

#endif

    *lib = dlopen(filename, dl_flags);

    return *lib == NULL ? 0 : 1;

}

static int shlib_sym(SHLIB lib, const char *symname, SHLIB_SYM *sym)

{

    *sym = dlsym(lib, symname);

    return *sym != NULL;

}

static int shlib_close(SHLIB lib)

{

    return dlclose(lib) != 0 ? 0 : 1;

}

#endif

#ifdef DSO_WIN32

# include <windows.h>

# define SHLIB_INIT 0

typedef HINSTANCE SHLIB;

typedef void *SHLIB_SYM;

static int shlib_load(const char *filename, SHLIB *lib)

{

    *lib = LoadLibraryA(filename);

    return *lib == NULL ? 0 : 1;

}

static int shlib_sym(SHLIB lib, const char *symname, SHLIB_SYM *sym)

{

    *sym = (SHLIB_SYM)GetProcAddress(lib, symname);

    return *sym != NULL;

}

static int shlib_close(SHLIB lib)

{

    return FreeLibrary(lib) == 0 ? 0 : 1;

}

#endif

#if defined(DSO_DLFCN) || defined(DSO_WIN32)

static int atexit_handler_done = 0;

static void atexit_handler(void)

{

    FILE *atexit_file = fopen(path_atexit, "w");

    if (atexit_file == NULL)

        return;

    fprintf(atexit_file, "atexit() run\n");

    fclose(atexit_file);

    atexit_handler_done++;

}

static int test_lib(void)

{

    SHLIB ssllib = SHLIB_INIT;

    SHLIB cryptolib = SHLIB_INIT;

    SSL_CTX *ctx;

    union {

        void (*func)(void);

        SHLIB_SYM sym;

    } symbols[3];

    TLS_method_t myTLS_method;

    SSL_CTX_new_t mySSL_CTX_new;

    SSL_CTX_free_t mySSL_CTX_free;

    ERR_get_error_t myERR_get_error;

    OpenSSL_version_num_t myOpenSSL_version_num;

    OPENSSL_atexit_t myOPENSSL_atexit;

    int result = 0;

    switch (test_type) {

    case JUST_CRYPTO:

    case DSO_REFTEST:

    case NO_ATEXIT:

    case CRYPTO_FIRST:

        if (!shlib_load(path_crypto, &cryptolib)) {

            fprintf(stderr, "Failed to load libcrypto\n");

            goto end;

        }

        if (test_type != CRYPTO_FIRST)

            break;

        /* Fall through */

    case SSL_FIRST:

        if (!shlib_load(path_ssl, &ssllib)) {

            fprintf(stderr, "Failed to load libssl\n");

            goto end;

        }

        if (test_type != SSL_FIRST)

            break;

        if (!shlib_load(path_crypto, &cryptolib)) {

            fprintf(stderr, "Failed to load libcrypto\n");

            goto end;

        }

        break;

    }

    if (test_type == NO_ATEXIT) {

        OPENSSL_init_crypto_t myOPENSSL_init_crypto;

        if (!shlib_sym(cryptolib, "OPENSSL_init_crypto", &symbols[0].sym)) {

            fprintf(stderr, "Failed to load OPENSSL_init_crypto symbol\n");

            goto end;

        }

        myOPENSSL_init_crypto = (OPENSSL_init_crypto_t)symbols[0].func;

        if (!myOPENSSL_init_crypto(OPENSSL_INIT_NO_ATEXIT, NULL)) {

            fprintf(stderr, "Failed to initialise libcrypto\n");

            goto end;

        }

    }

    if (test_type != JUST_CRYPTO

            && test_type != DSO_REFTEST

            && test_type != NO_ATEXIT) {

        if (!shlib_sym(ssllib, "TLS_method", &symbols[0].sym)

                || !shlib_sym(ssllib, "SSL_CTX_new", &symbols[1].sym)

                || !shlib_sym(ssllib, "SSL_CTX_free", &symbols[2].sym)) {

            fprintf(stderr, "Failed to load libssl symbols\n");

            goto end;

        }

        myTLS_method = (TLS_method_t)symbols[0].func;

        mySSL_CTX_new = (SSL_CTX_new_t)symbols[1].func;

        mySSL_CTX_free = (SSL_CTX_free_t)symbols[2].func;

        ctx = mySSL_CTX_new(myTLS_method());

        if (ctx == NULL) {

            fprintf(stderr, "Failed to create SSL_CTX\n");

            goto end;

        }

        mySSL_CTX_free(ctx);

    }

    if (!shlib_sym(cryptolib, "ERR_get_error", &symbols[0].sym)

           || !shlib_sym(cryptolib, "OpenSSL_version_num", &symbols[1].sym)

           || !shlib_sym(cryptolib, "OPENSSL_atexit", &symbols[2].sym)) {

        fprintf(stderr, "Failed to load libcrypto symbols\n");

        goto end;

    }

    myERR_get_error = (ERR_get_error_t)symbols[0].func;

    if (myERR_get_error() != 0) {

        fprintf(stderr, "Unexpected ERR_get_error() response\n");

        goto end;

    }

    myOpenSSL_version_num = (OpenSSL_version_num_t)symbols[1].func;

    if (myOpenSSL_version_num()  != OPENSSL_VERSION_NUMBER) {

        fprintf(stderr, "Invalid library version number\n");

        goto end;

    }

    myOPENSSL_atexit = (OPENSSL_atexit_t)symbols[2].func;

    if (!myOPENSSL_atexit(atexit_handler)) {

        fprintf(stderr, "Failed to register atexit handler\n");

        goto end;

    }

    if (test_type == DSO_REFTEST) {

# ifdef DSO_DLFCN

        DSO_dsobyaddr_t myDSO_dsobyaddr;

        DSO_free_t myDSO_free;

        /*

         * This is resembling the code used in ossl_init_base() and

         * OPENSSL_atexit() to block unloading the library after dlclose().

         * We are not testing this on Windows, because it is done there in a

         * completely different way. Especially as a call to DSO_dsobyaddr()

         * will always return an error, because DSO_pathbyaddr() is not

         * implemented there.

         */

        if (!shlib_sym(cryptolib, "DSO_dsobyaddr", &symbols[0].sym)

                || !shlib_sym(cryptolib, "DSO_free", &symbols[1].sym)) {

            fprintf(stderr, "Unable to load DSO symbols\n");

            goto end;

        }

        myDSO_dsobyaddr = (DSO_dsobyaddr_t)symbols[0].func;

        myDSO_free = (DSO_free_t)symbols[1].func;

        {

            DSO *hndl;

            /* use known symbol from crypto module */

            hndl = myDSO_dsobyaddr((void (*)(void))myERR_get_error, 0);

            if (hndl == NULL) {

                fprintf(stderr, "DSO_dsobyaddr() failed\n");

                goto end;

            }

            myDSO_free(hndl);

        }

# endif /* DSO_DLFCN */

    }

    if (!shlib_close(cryptolib)) {

        fprintf(stderr, "Failed to close libcrypto\n");

        goto end;

    }

    if (test_type == CRYPTO_FIRST || test_type == SSL_FIRST) {

        if (!shlib_close(ssllib)) {

            fprintf(stderr, "Failed to close libssl\n");

            goto end;

        }

    }

# if defined(OPENSSL_NO_PINSHARED) \

    && defined(__GLIBC__) \

    && defined(__GLIBC_PREREQ) \

    && defined(OPENSSL_SYS_LINUX)

#  if __GLIBC_PREREQ(2, 3)

    /*

     * If we didn't pin the so then we are hopefully on a platform that supports

     * running atexit() on so unload. If not we might crash. We know this is

     * true on linux since glibc 2.2.3

     */

    if (test_type != NO_ATEXIT && atexit_handler_done != 1) {

        fprintf(stderr, "atexit() handler did not run\n");

        goto end;

    }

#  endif

# endif

    result = 1;

end:

    return result;

}

#endif

/*

 * shlibloadtest should not use the normal test framework because we don't want

 * it to link against libcrypto (which the framework uses). The point of the

 * test is to check dynamic loading and unloading of libcrypto/libssl.

 */

int main(int argc, char *argv[])

{

    const char *p;

    if (argc != 5) {

        fprintf(stderr, "Incorrect number of arguments\n");

        return 1;

    }

    p = argv[1];

    if (strcmp(p, "-crypto_first") == 0) {

        test_type = CRYPTO_FIRST;

    } else if (strcmp(p, "-ssl_first") == 0) {

        test_type = SSL_FIRST;

    } else if (strcmp(p, "-just_crypto") == 0) {

        test_type = JUST_CRYPTO;

    } else if (strcmp(p, "-dso_ref") == 0) {

        test_type = DSO_REFTEST;

    } else if (strcmp(p, "-no_atexit") == 0) {

        test_type = NO_ATEXIT;

    } else {

        fprintf(stderr, "Unrecognised argument\n");

        return 1;

    }

    path_crypto = argv[2];

    path_ssl = argv[3];

    path_atexit = argv[4];

    if (path_crypto == NULL || path_ssl == NULL) {

        fprintf(stderr, "Invalid libcrypto/libssl path\n");

        return 1;

    }

#if defined(DSO_DLFCN) || defined(DSO_WIN32)

    if (!test_lib())

        return 1;

#endif

    return 0;

}