1 | /*
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2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (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_lcl.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 int nullf_new(BIO *h);
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25 | static int nullf_free(BIO *data);
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26 | static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
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27 | static const BIO_METHOD methods_nullf = {
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28 | BIO_TYPE_NULL_FILTER,
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29 | "NULL filter",
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30 | nullf_write,
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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 | nullf_new,
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36 | nullf_free,
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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_new(BIO *bi)
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46 | {
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47 | bi->init = 1;
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48 | bi->ptr = NULL;
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49 | bi->flags = 0;
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50 | return (1);
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51 | }
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52 |
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53 | static int nullf_free(BIO *a)
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54 | {
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55 | if (a == NULL)
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56 | return (0);
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57 | /*-
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58 | a->ptr=NULL;
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59 | a->init=0;
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60 | a->flags=0;
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61 | */
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62 | return (1);
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63 | }
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64 |
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65 | static int nullf_read(BIO *b, char *out, int outl)
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66 | {
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67 | int ret = 0;
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68 |
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69 | if (out == NULL)
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70 | return (0);
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71 | if (b->next_bio == NULL)
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72 | return (0);
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73 | ret = BIO_read(b->next_bio, out, outl);
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74 | BIO_clear_retry_flags(b);
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75 | BIO_copy_next_retry(b);
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76 | return (ret);
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77 | }
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78 |
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79 | static int nullf_write(BIO *b, const char *in, int inl)
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80 | {
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81 | int ret = 0;
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82 |
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83 | if ((in == NULL) || (inl <= 0))
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84 | return (0);
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85 | if (b->next_bio == NULL)
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86 | return (0);
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87 | ret = BIO_write(b->next_bio, in, inl);
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88 | BIO_clear_retry_flags(b);
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89 | BIO_copy_next_retry(b);
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90 | return (ret);
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91 | }
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92 |
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93 | static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
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94 | {
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95 | long ret;
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96 |
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97 | if (b->next_bio == NULL)
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98 | return (0);
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99 | switch (cmd) {
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100 | case BIO_C_DO_STATE_MACHINE:
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101 | BIO_clear_retry_flags(b);
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102 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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103 | BIO_copy_next_retry(b);
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104 | break;
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105 | case BIO_CTRL_DUP:
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106 | ret = 0L;
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107 | break;
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108 | default:
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109 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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110 | }
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111 | return (ret);
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112 | }
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113 |
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114 | static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
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115 | {
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116 | long ret = 1;
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117 |
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118 | if (b->next_bio == NULL)
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119 | return (0);
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120 | switch (cmd) {
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121 | default:
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122 | ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
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123 | break;
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124 | }
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125 | return (ret);
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126 | }
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127 |
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128 | static int nullf_gets(BIO *bp, char *buf, int size)
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129 | {
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130 | if (bp->next_bio == NULL)
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131 | return (0);
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132 | return (BIO_gets(bp->next_bio, buf, size));
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133 | }
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134 |
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135 | static int nullf_puts(BIO *bp, const char *str)
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136 | {
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137 | if (bp->next_bio == NULL)
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138 | return (0);
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139 | return (BIO_puts(bp->next_bio, str));
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140 | }
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