| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. |
| 3 | * |
| 4 | * Licensed under the OpenSSL license (the "License"). You may not use |
| 5 | * this file except in compliance with the License. You can obtain a copy |
| 6 | * in the file LICENSE in the source distribution or at |
| 7 | * https://www.openssl.org/source/license.html |
| 8 | */ |
| 9 | |
| 10 | #include <stdio.h> |
| 11 | #include <errno.h> |
| 12 | #include "bio_local.h" |
| 13 | #include "internal/cryptlib.h" |
| 14 | |
| 15 | /* |
| 16 | * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest |
| 17 | */ |
| 18 | |
| 19 | static int nullf_write(BIO *h, const char *buf, int num); |
| 20 | static int nullf_read(BIO *h, char *buf, int size); |
| 21 | static int nullf_puts(BIO *h, const char *str); |
| 22 | static int nullf_gets(BIO *h, char *str, int size); |
| 23 | static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2); |
| 24 | static long nullf_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp); |
| 25 | static const BIO_METHOD methods_nullf = { |
| 26 | BIO_TYPE_NULL_FILTER, |
| 27 | "NULL filter", |
| 28 | /* TODO: Convert to new style write function */ |
| 29 | bwrite_conv, |
| 30 | nullf_write, |
| 31 | /* TODO: Convert to new style read function */ |
| 32 | bread_conv, |
| 33 | nullf_read, |
| 34 | nullf_puts, |
| 35 | nullf_gets, |
| 36 | nullf_ctrl, |
| 37 | NULL, |
| 38 | NULL, |
| 39 | nullf_callback_ctrl, |
| 40 | }; |
| 41 | |
| 42 | const BIO_METHOD *BIO_f_null(void) |
| 43 | { |
| 44 | return &methods_nullf; |
| 45 | } |
| 46 | |
| 47 | static int nullf_read(BIO *b, char *out, int outl) |
| 48 | { |
| 49 | int ret = 0; |
| 50 | |
| 51 | if (out == NULL) |
| 52 | return 0; |
| 53 | if (b->next_bio == NULL) |
| 54 | return 0; |
| 55 | ret = BIO_read(b->next_bio, out, outl); |
| 56 | BIO_clear_retry_flags(b); |
| 57 | BIO_copy_next_retry(b); |
| 58 | return ret; |
| 59 | } |
| 60 | |
| 61 | static int nullf_write(BIO *b, const char *in, int inl) |
| 62 | { |
| 63 | int ret = 0; |
| 64 | |
| 65 | if ((in == NULL) || (inl <= 0)) |
| 66 | return 0; |
| 67 | if (b->next_bio == NULL) |
| 68 | return 0; |
| 69 | ret = BIO_write(b->next_bio, in, inl); |
| 70 | BIO_clear_retry_flags(b); |
| 71 | BIO_copy_next_retry(b); |
| 72 | return ret; |
| 73 | } |
| 74 | |
| 75 | static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr) |
| 76 | { |
| 77 | long ret; |
| 78 | |
| 79 | if (b->next_bio == NULL) |
| 80 | return 0; |
| 81 | switch (cmd) { |
| 82 | case BIO_C_DO_STATE_MACHINE: |
| 83 | BIO_clear_retry_flags(b); |
| 84 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); |
| 85 | BIO_copy_next_retry(b); |
| 86 | break; |
| 87 | case BIO_CTRL_DUP: |
| 88 | ret = 0L; |
| 89 | break; |
| 90 | default: |
| 91 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); |
| 92 | } |
| 93 | return ret; |
| 94 | } |
| 95 | |
| 96 | static long nullf_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp) |
| 97 | { |
| 98 | long ret = 1; |
| 99 | |
| 100 | if (b->next_bio == NULL) |
| 101 | return 0; |
| 102 | switch (cmd) { |
| 103 | default: |
| 104 | ret = BIO_callback_ctrl(b->next_bio, cmd, fp); |
| 105 | break; |
| 106 | } |
| 107 | return ret; |
| 108 | } |
| 109 | |
| 110 | static int nullf_gets(BIO *bp, char *buf, int size) |
| 111 | { |
| 112 | if (bp->next_bio == NULL) |
| 113 | return 0; |
| 114 | return BIO_gets(bp->next_bio, buf, size); |
| 115 | } |
| 116 | |
| 117 | static int nullf_puts(BIO *bp, const char *str) |
| 118 | { |
| 119 | if (bp->next_bio == NULL) |
| 120 | return 0; |
| 121 | return BIO_puts(bp->next_bio, str); |
| 122 | } |