/*
 * Copyright 2015-2022 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (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
 */

#ifdef _WIN32
# include <windows.h>
#endif

#include <stdio.h>
#include <string.h>
#include <openssl/async.h>
#include <openssl/crypto.h>

static int ctr = 0;
static ASYNC_JOB *currjob = NULL;
static int custom_alloc_used = 0;
static int custom_free_used = 0;

static int only_pause(void *args)
{
    ASYNC_pause_job();

    return 1;
}

static int add_two(void *args)
{
    ctr++;
    ASYNC_pause_job();
    ctr++;

    return 2;
}

static int save_current(void *args)
{
    currjob = ASYNC_get_current_job();
    ASYNC_pause_job();

    return 1;
}

static int change_deflt_libctx(void *args)
{
    OSSL_LIB_CTX *libctx = OSSL_LIB_CTX_new();
    OSSL_LIB_CTX *oldctx, *tmpctx;
    int ret = 0;

    if (libctx == NULL)
        return 0;

    oldctx = OSSL_LIB_CTX_set0_default(libctx);
    ASYNC_pause_job();

    /* Check the libctx is set up as we expect */
    tmpctx = OSSL_LIB_CTX_set0_default(oldctx);
    if (tmpctx != libctx)
        goto err;

    /* Set it back again to continue to use our own libctx */
    oldctx = OSSL_LIB_CTX_set0_default(libctx);
    ASYNC_pause_job();

    /* Check the libctx is set up as we expect */
    tmpctx = OSSL_LIB_CTX_set0_default(oldctx);
    if (tmpctx != libctx)
        goto err;

    ret = 1;
 err:
    OSSL_LIB_CTX_free(libctx);
    return ret;
}


#define MAGIC_WAIT_FD   ((OSSL_ASYNC_FD)99)
static int waitfd(void *args)
{
    ASYNC_JOB *job;
    ASYNC_WAIT_CTX *waitctx;
    job = ASYNC_get_current_job();
    if (job == NULL)
        return 0;
    waitctx = ASYNC_get_wait_ctx(job);
    if (waitctx == NULL)
        return 0;

    /* First case: no fd added or removed */
    ASYNC_pause_job();

    /* Second case: one fd added */
    if (!ASYNC_WAIT_CTX_set_wait_fd(waitctx, waitctx, MAGIC_WAIT_FD, NULL, NULL))
        return 0;
    ASYNC_pause_job();

    /* Third case: all fd removed */
    if (!ASYNC_WAIT_CTX_clear_fd(waitctx, waitctx))
        return 0;
    ASYNC_pause_job();

    /* Last case: fd added and immediately removed */
    if (!ASYNC_WAIT_CTX_set_wait_fd(waitctx, waitctx, MAGIC_WAIT_FD, NULL, NULL))
        return 0;
    if (!ASYNC_WAIT_CTX_clear_fd(waitctx, waitctx))
        return 0;

    return 1;
}

static int blockpause(void *args)
{
    ASYNC_block_pause();
    ASYNC_pause_job();
    ASYNC_unblock_pause();
    ASYNC_pause_job();

    return 1;
}

static int test_ASYNC_init_thread(void)
{
    ASYNC_JOB *job1 = NULL, *job2 = NULL, *job3 = NULL;
    int funcret1, funcret2, funcret3;
    ASYNC_WAIT_CTX *waitctx = NULL;

    if (       !ASYNC_init_thread(2, 0)
            || (waitctx = ASYNC_WAIT_CTX_new()) == NULL
            || ASYNC_start_job(&job1, waitctx, &funcret1, only_pause, NULL, 0)
                != ASYNC_PAUSE
            || ASYNC_start_job(&job2, waitctx, &funcret2, only_pause, NULL, 0)
                != ASYNC_PAUSE
            || ASYNC_start_job(&job3, waitctx, &funcret3, only_pause, NULL, 0)
                != ASYNC_NO_JOBS
            || ASYNC_start_job(&job1, waitctx, &funcret1, only_pause, NULL, 0)
                != ASYNC_FINISH
            || ASYNC_start_job(&job3, waitctx, &funcret3, only_pause, NULL, 0)
                != ASYNC_PAUSE
            || ASYNC_start_job(&job2, waitctx, &funcret2, only_pause, NULL, 0)
                != ASYNC_FINISH
            || ASYNC_start_job(&job3, waitctx, &funcret3, only_pause, NULL, 0)
                != ASYNC_FINISH
            || funcret1 != 1
            || funcret2 != 1
            || funcret3 != 1) {
        fprintf(stderr, "test_ASYNC_init_thread() failed\n");
        ASYNC_WAIT_CTX_free(waitctx);
        ASYNC_cleanup_thread();
        return 0;
    }

    ASYNC_WAIT_CTX_free(waitctx);
    ASYNC_cleanup_thread();
    return 1;
}

static int test_callback(void *arg)
{
    printf("callback test pass\n");
    return 1;
}

static int test_ASYNC_callback_status(void)
{
    ASYNC_WAIT_CTX *waitctx = NULL;
    int set_arg = 100;
    ASYNC_callback_fn get_callback;
    void *get_arg;
    int set_status = 1;

    if (       !ASYNC_init_thread(1, 0)
            || (waitctx = ASYNC_WAIT_CTX_new()) == NULL
            || ASYNC_WAIT_CTX_set_callback(waitctx, test_callback, (void*)&set_arg)
               != 1
            || ASYNC_WAIT_CTX_get_callback(waitctx, &get_callback, &get_arg)
               != 1
            || test_callback != get_callback
            || get_arg != (void*)&set_arg
            || (*get_callback)(get_arg) != 1
            || ASYNC_WAIT_CTX_set_status(waitctx, set_status) != 1
            || set_status != ASYNC_WAIT_CTX_get_status(waitctx)) {
        fprintf(stderr, "test_ASYNC_callback_status() failed\n");
        ASYNC_WAIT_CTX_free(waitctx);
        ASYNC_cleanup_thread();
        return 0;
    }

    ASYNC_WAIT_CTX_free(waitctx);
    ASYNC_cleanup_thread();
    return 1;

}

static int test_ASYNC_start_job(void)
{
    ASYNC_JOB *job = NULL;
    int funcret;
    ASYNC_WAIT_CTX *waitctx = NULL;

    ctr = 0;

    if (       !ASYNC_init_thread(1, 0)
            || (waitctx = ASYNC_WAIT_CTX_new()) == NULL
            || ASYNC_start_job(&job, waitctx, &funcret, add_two, NULL, 0)
               != ASYNC_PAUSE
            || ctr != 1
            || ASYNC_start_job(&job, waitctx, &funcret, add_two, NULL, 0)
               != ASYNC_FINISH
            || ctr != 2
            || funcret != 2) {
        fprintf(stderr, "test_ASYNC_start_job() failed\n");
        ASYNC_WAIT_CTX_free(waitctx);
        ASYNC_cleanup_thread();
        return 0;
    }

    ASYNC_WAIT_CTX_free(waitctx);
    ASYNC_cleanup_thread();
    return 1;
}

static int test_ASYNC_get_current_job(void)
{
    ASYNC_JOB *job = NULL;
    int funcret;
    ASYNC_WAIT_CTX *waitctx = NULL;

    currjob = NULL;

    if (       !ASYNC_init_thread(1, 0)
            || (waitctx = ASYNC_WAIT_CTX_new()) == NULL
            || ASYNC_start_job(&job, waitctx, &funcret, save_current, NULL, 0)
                != ASYNC_PAUSE
            || currjob != job
            || ASYNC_start_job(&job, waitctx, &funcret, save_current, NULL, 0)
                != ASYNC_FINISH
            || funcret != 1) {
        fprintf(stderr, "test_ASYNC_get_current_job() failed\n");
        ASYNC_WAIT_CTX_free(waitctx);
        ASYNC_cleanup_thread();
        return 0;
    }

    ASYNC_WAIT_CTX_free(waitctx);
    ASYNC_cleanup_thread();
    return 1;
}

static int test_ASYNC_WAIT_CTX_get_all_fds(void)
{
    ASYNC_JOB *job = NULL;
    int funcret;
    ASYNC_WAIT_CTX *waitctx = NULL;
    OSSL_ASYNC_FD fd = OSSL_BAD_ASYNC_FD, delfd = OSSL_BAD_ASYNC_FD;
    size_t numfds, numdelfds;

    if (       !ASYNC_init_thread(1, 0)
            || (waitctx = ASYNC_WAIT_CTX_new()) == NULL
               /* On first run we're not expecting any wait fds */
            || ASYNC_start_job(&job, waitctx, &funcret, waitfd, NULL, 0)
                != ASYNC_PAUSE
            || !ASYNC_WAIT_CTX_get_all_fds(waitctx, NULL, &numfds)
            || numfds != 0
            || !ASYNC_WAIT_CTX_get_changed_fds(waitctx, NULL, &numfds, NULL,
                                               &numdelfds)
            || numfds != 0
            || numdelfds != 0
               /* On second run we're expecting one added fd */
            || ASYNC_start_job(&job, waitctx, &funcret, waitfd, NULL, 0)
                != ASYNC_PAUSE
            || !ASYNC_WAIT_CTX_get_all_fds(waitctx, NULL, &numfds)
            || numfds != 1
            || !ASYNC_WAIT_CTX_get_all_fds(waitctx, &fd, &numfds)
            || fd != MAGIC_WAIT_FD
            || (fd = OSSL_BAD_ASYNC_FD, 0) /* Assign to something else */
            || !ASYNC_WAIT_CTX_get_changed_fds(waitctx, NULL, &numfds, NULL,
                                               &numdelfds)
            || numfds != 1
            || numdelfds != 0
            || !ASYNC_WAIT_CTX_get_changed_fds(waitctx, &fd, &numfds, NULL,
                                               &numdelfds)
            || fd != MAGIC_WAIT_FD
               /* On third run we expect one deleted fd */
            || ASYNC_start_job(&job, waitctx, &funcret, waitfd, NULL, 0)
                != ASYNC_PAUSE
            || !ASYNC_WAIT_CTX_get_all_fds(waitctx, NULL, &numfds)
            || numfds != 0
            || !ASYNC_WAIT_CTX_get_changed_fds(waitctx, NULL, &numfds, NULL,
                                               &numdelfds)
            || numfds != 0
            || numdelfds != 1
            || !ASYNC_WAIT_CTX_get_changed_fds(waitctx, NULL, &numfds, &delfd,
                                               &numdelfds)
            || delfd != MAGIC_WAIT_FD
            /* On last run we are not expecting any wait fd */
            || ASYNC_start_job(&job, waitctx, &funcret, waitfd, NULL, 0)
                != ASYNC_FINISH
            || !ASYNC_WAIT_CTX_get_all_fds(waitctx, NULL, &numfds)
            || numfds != 0
            || !ASYNC_WAIT_CTX_get_changed_fds(waitctx, NULL, &numfds, NULL,
                                               &numdelfds)
            || numfds != 0
            || numdelfds != 0
            || funcret != 1) {
        fprintf(stderr, "test_ASYNC_get_wait_fd() failed\n");
        ASYNC_WAIT_CTX_free(waitctx);
        ASYNC_cleanup_thread();
        return 0;
    }

    ASYNC_WAIT_CTX_free(waitctx);
    ASYNC_cleanup_thread();
    return 1;
}

static int test_ASYNC_block_pause(void)
{
    ASYNC_JOB *job = NULL;
    int funcret;
    ASYNC_WAIT_CTX *waitctx = NULL;

    if (       !ASYNC_init_thread(1, 0)
            || (waitctx = ASYNC_WAIT_CTX_new()) == NULL
            || ASYNC_start_job(&job, waitctx, &funcret, blockpause, NULL, 0)
                != ASYNC_PAUSE
            || ASYNC_start_job(&job, waitctx, &funcret, blockpause, NULL, 0)
                != ASYNC_FINISH
            || funcret != 1) {
        fprintf(stderr, "test_ASYNC_block_pause() failed\n");
        ASYNC_WAIT_CTX_free(waitctx);
        ASYNC_cleanup_thread();
        return 0;
    }

    ASYNC_WAIT_CTX_free(waitctx);
    ASYNC_cleanup_thread();
    return 1;
}

static int test_ASYNC_start_job_ex(void)
{
    ASYNC_JOB *job = NULL;
    int funcret;
    ASYNC_WAIT_CTX *waitctx = NULL;
    OSSL_LIB_CTX *libctx = OSSL_LIB_CTX_new();
    OSSL_LIB_CTX *oldctx, *tmpctx, *globalctx;
    int ret = 0;

    if (libctx == NULL) {
        fprintf(stderr,
                "test_ASYNC_start_job_ex() failed to create libctx\n");
        goto err;
    }

    globalctx = oldctx = OSSL_LIB_CTX_set0_default(libctx);

    if ((waitctx = ASYNC_WAIT_CTX_new()) == NULL
            || ASYNC_start_job(&job, waitctx, &funcret, change_deflt_libctx,
                               NULL, 0)
               != ASYNC_PAUSE) {
        fprintf(stderr,
                "test_ASYNC_start_job_ex() failed to start job\n");
        goto err;
    }

    /* Reset the libctx temporarily to find out what it is*/
    tmpctx = OSSL_LIB_CTX_set0_default(oldctx);
    oldctx = OSSL_LIB_CTX_set0_default(tmpctx);
    if (tmpctx != libctx) {
        fprintf(stderr,
                "test_ASYNC_start_job_ex() failed - unexpected libctx\n");
        goto err;
    }

    if (ASYNC_start_job(&job, waitctx, &funcret, change_deflt_libctx, NULL, 0)
               != ASYNC_PAUSE) {
        fprintf(stderr,
                "test_ASYNC_start_job_ex() - restarting job failed\n");
        goto err;
    }

    /* Reset the libctx and continue with the global default libctx */
    tmpctx = OSSL_LIB_CTX_set0_default(oldctx);
    if (tmpctx != libctx) {
        fprintf(stderr,
                "test_ASYNC_start_job_ex() failed - unexpected libctx\n");
        goto err;
    }

    if (ASYNC_start_job(&job, waitctx, &funcret, change_deflt_libctx, NULL, 0)
               != ASYNC_FINISH
                || funcret != 1) {
        fprintf(stderr,
                "test_ASYNC_start_job_ex() - finishing job failed\n");
        goto err;
    }

    /* Reset the libctx temporarily to find out what it is*/
    tmpctx = OSSL_LIB_CTX_set0_default(libctx);
    OSSL_LIB_CTX_set0_default(tmpctx);
    if (tmpctx != globalctx) {
        fprintf(stderr,
                "test_ASYNC_start_job_ex() failed - global libctx check failed\n");
        goto err;
    }

    ret = 1;
 err:
    ASYNC_WAIT_CTX_free(waitctx);
    OSSL_LIB_CTX_free(libctx);
    return ret;
}

static void *test_alloc_stack(size_t *num)
{
    custom_alloc_used = 1;
    return OPENSSL_malloc(*num);
}

static void test_free_stack(void *addr)
{
    custom_free_used = 1;
    OPENSSL_free(addr);
}

static int test_ASYNC_set_mem_functions(void)
{
    ASYNC_stack_alloc_fn alloc_fn;
    ASYNC_stack_free_fn free_fn;

    /* Not all platforms support this */
    if (ASYNC_set_mem_functions(test_alloc_stack, test_free_stack) == 0) return 1;

    ASYNC_get_mem_functions(&alloc_fn, &free_fn);

    if ((alloc_fn != test_alloc_stack) || (free_fn != test_free_stack)) {
        fprintf(stderr,
                "test_ASYNC_set_mem_functions() - setting and retrieving custom allocators failed\n");
        return 0;
    }

    if (!ASYNC_init_thread(1, 1)) {
        fprintf(stderr,
                "test_ASYNC_set_mem_functions() - failed initialising ctx pool\n");
        return 0;
    }
    ASYNC_cleanup_thread();

    if (!custom_alloc_used || !custom_free_used) {
         fprintf(stderr,
                "test_ASYNC_set_mem_functions() - custom allocation functions not used\n");

        return 0;
    }

    return 1;
}

int main(int argc, char **argv)
{
    if (!ASYNC_is_capable()) {
        fprintf(stderr,
                "OpenSSL build is not ASYNC capable - skipping async tests\n");
    } else {
        if (!test_ASYNC_init_thread()
                || !test_ASYNC_callback_status()
                || !test_ASYNC_start_job()
                || !test_ASYNC_get_current_job()
                || !test_ASYNC_WAIT_CTX_get_all_fds()
                || !test_ASYNC_block_pause()
                || !test_ASYNC_start_job_ex()
                || !test_ASYNC_set_mem_functions()) {
            return 1;
        }
    }
    printf("PASS\n");
    return 0;
}