/*

 * Copyright 1995-2017 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 "bio_local.h"

#include "internal/cryptlib.h"

#include <openssl/err.h>

long BIO_debug_callback(BIO *bio, int cmd, const char *argp,

                        int argi, long argl, long ret)

{

    BIO *b;

    char buf[256];

    char *p;

    long r = 1;

    int len, left;

    if (BIO_CB_RETURN & cmd)

        r = ret;

    len = BIO_snprintf(buf, sizeof(buf), "BIO[%p]: ", (void *)bio);

    /* Ignore errors and continue printing the other information. */

    if (len < 0)

        len = 0;

    p = buf + len;

    left = sizeof(buf) - len;

    switch (cmd) {

    case BIO_CB_FREE:

        BIO_snprintf(p, left, "Free - %s\n", bio->method->name);

        break;

    case BIO_CB_READ:

        if (bio->method->type & BIO_TYPE_DESCRIPTOR)

            BIO_snprintf(p, left, "read(%d,%lu) - %s fd=%d\n",

                         bio->num, (unsigned long)argi,

                         bio->method->name, bio->num);

        else

            BIO_snprintf(p, left, "read(%d,%lu) - %s\n",

                    bio->num, (unsigned long)argi, bio->method->name);

        break;

    case BIO_CB_WRITE:

        if (bio->method->type & BIO_TYPE_DESCRIPTOR)

            BIO_snprintf(p, left, "write(%d,%lu) - %s fd=%d\n",

                         bio->num, (unsigned long)argi,

                         bio->method->name, bio->num);

        else

            BIO_snprintf(p, left, "write(%d,%lu) - %s\n",

                         bio->num, (unsigned long)argi, bio->method->name);

        break;

    case BIO_CB_PUTS:

        BIO_snprintf(p, left, "puts() - %s\n", bio->method->name);

        break;

    case BIO_CB_GETS:

        BIO_snprintf(p, left, "gets(%lu) - %s\n", (unsigned long)argi,

                     bio->method->name);

        break;

    case BIO_CB_CTRL:

        BIO_snprintf(p, left, "ctrl(%lu) - %s\n", (unsigned long)argi,

                     bio->method->name);

        break;

    case BIO_CB_RETURN | BIO_CB_READ:

        BIO_snprintf(p, left, "read return %ld\n", ret);

        break;

    case BIO_CB_RETURN | BIO_CB_WRITE:

        BIO_snprintf(p, left, "write return %ld\n", ret);

        break;

    case BIO_CB_RETURN | BIO_CB_GETS:

        BIO_snprintf(p, left, "gets return %ld\n", ret);

        break;

    case BIO_CB_RETURN | BIO_CB_PUTS:

        BIO_snprintf(p, left, "puts return %ld\n", ret);

        break;

    case BIO_CB_RETURN | BIO_CB_CTRL:

        BIO_snprintf(p, left, "ctrl return %ld\n", ret);

        break;

    default:

        BIO_snprintf(p, left, "bio callback - unknown type (%d)\n", cmd);

        break;

    }

    b = (BIO *)bio->cb_arg;

    if (b != NULL)

        BIO_write(b, buf, strlen(buf));

#if !defined(OPENSSL_NO_STDIO)

    else

        fputs(buf, stderr);

#endif

    return r;

}