| 1 | /*
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| 2 | * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <errno.h>
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| 12 | #include "bio_local.h"
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| 13 | #include "internal/cryptlib.h"
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| 14 |
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| 15 | /*
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| 16 | * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
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| 17 | */
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| 18 |
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| 19 | static int nullf_write(BIO *h, const char *buf, int num);
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| 20 | static int nullf_read(BIO *h, char *buf, int size);
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| 21 | static int nullf_puts(BIO *h, const char *str);
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| 22 | static int nullf_gets(BIO *h, char *str, int size);
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| 23 | static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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| 24 | static long nullf_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
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| 25 | static const BIO_METHOD methods_nullf = {
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| 26 | BIO_TYPE_NULL_FILTER,
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| 27 | "NULL filter",
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| 28 | bwrite_conv,
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| 29 | nullf_write,
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| 30 | bread_conv,
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| 31 | nullf_read,
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| 32 | nullf_puts,
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| 33 | nullf_gets,
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| 34 | nullf_ctrl,
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| 35 | NULL,
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| 36 | NULL,
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| 37 | nullf_callback_ctrl,
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| 38 | };
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| 39 |
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| 40 | const BIO_METHOD *BIO_f_null(void)
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| 41 | {
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| 42 | return &methods_nullf;
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| 43 | }
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| 44 |
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| 45 | static int nullf_read(BIO *b, char *out, int outl)
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| 46 | {
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| 47 | int ret = 0;
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| 48 |
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| 49 | if (out == NULL)
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| 50 | return 0;
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| 51 | if (b->next_bio == NULL)
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| 52 | return 0;
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| 53 | ret = BIO_read(b->next_bio, out, outl);
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| 54 | BIO_clear_retry_flags(b);
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| 55 | BIO_copy_next_retry(b);
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| 56 | return ret;
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| 57 | }
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| 58 |
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| 59 | static int nullf_write(BIO *b, const char *in, int inl)
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| 60 | {
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| 61 | int ret = 0;
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| 62 |
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| 63 | if ((in == NULL) || (inl <= 0))
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| 64 | return 0;
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| 65 | if (b->next_bio == NULL)
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| 66 | return 0;
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| 67 | ret = BIO_write(b->next_bio, in, inl);
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| 68 | BIO_clear_retry_flags(b);
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| 69 | BIO_copy_next_retry(b);
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| 70 | return ret;
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| 71 | }
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| 72 |
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| 73 | static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
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| 74 | {
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| 75 | long ret;
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| 76 |
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| 77 | if (b->next_bio == NULL)
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| 78 | return 0;
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| 79 | switch (cmd) {
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| 80 | case BIO_C_DO_STATE_MACHINE:
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| 81 | BIO_clear_retry_flags(b);
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| 82 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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| 83 | BIO_copy_next_retry(b);
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| 84 | break;
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| 85 | case BIO_CTRL_DUP:
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| 86 | ret = 0L;
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| 87 | break;
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| 88 | default:
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| 89 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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| 90 | }
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| 91 | return ret;
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| 92 | }
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| 93 |
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| 94 | static long nullf_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
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| 95 | {
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| 96 | if (b->next_bio == NULL)
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| 97 | return 0;
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| 98 | return BIO_callback_ctrl(b->next_bio, cmd, fp);
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| 99 | }
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| 100 |
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| 101 | static int nullf_gets(BIO *bp, char *buf, int size)
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| 102 | {
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| 103 | if (bp->next_bio == NULL)
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| 104 | return 0;
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| 105 | return BIO_gets(bp->next_bio, buf, size);
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| 106 | }
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| 107 |
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| 108 | static int nullf_puts(BIO *bp, const char *str)
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| 109 | {
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| 110 | if (bp->next_bio == NULL)
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| 111 | return 0;
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| 112 | return BIO_puts(bp->next_bio, str);
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| 113 | }
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