1 | /* |
2 | * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License 2.0 (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 | } |
123 | |