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 #include <openssl/rand.h> 15 16 /* 17 * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest 18 */ 19 20 static int nbiof_write(BIO *h, const char *buf, int num); 21 static int nbiof_read(BIO *h, char *buf, int size); 22 static int nbiof_puts(BIO *h, const char *str); 23 static int nbiof_gets(BIO *h, char *str, int size); 24 static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2); 25 static int nbiof_new(BIO *h); 26 static int nbiof_free(BIO *data); 27 static long nbiof_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp); 28 typedef struct nbio_test_st { 29 /* only set if we sent a 'should retry' error */ 30 int lrn; 31 int lwn; 32 } NBIO_TEST; 33 34 static const BIO_METHOD methods_nbiof = { 35 BIO_TYPE_NBIO_TEST, 36 "non-blocking IO test filter", 37 /* TODO: Convert to new style write function */ 38 bwrite_conv, 39 nbiof_write, 40 /* TODO: Convert to new style read function */ 41 bread_conv, 42 nbiof_read, 43 nbiof_puts, 44 nbiof_gets, 45 nbiof_ctrl, 46 nbiof_new, 47 nbiof_free, 48 nbiof_callback_ctrl, 49 }; 50 51 const BIO_METHOD *BIO_f_nbio_test(void) 52 { 53 return &methods_nbiof; 54 } 55 56 static int nbiof_new(BIO *bi) 57 { 58 NBIO_TEST *nt; 59 60 if ((nt = OPENSSL_zalloc(sizeof(*nt))) == NULL) { 61 BIOerr(BIO_F_NBIOF_NEW, ERR_R_MALLOC_FAILURE); 62 return 0; 63 } 64 nt->lrn = -1; 65 nt->lwn = -1; 66 bi->ptr = (char *)nt; 67 bi->init = 1; 68 return 1; 69 } 70 71 static int nbiof_free(BIO *a) 72 { 73 if (a == NULL) 74 return 0; 75 OPENSSL_free(a->ptr); 76 a->ptr = NULL; 77 a->init = 0; 78 a->flags = 0; 79 return 1; 80 } 81 82 static int nbiof_read(BIO *b, char *out, int outl) 83 { 84 int ret = 0; 85 int num; 86 unsigned char n; 87 88 if (out == NULL) 89 return 0; 90 if (b->next_bio == NULL) 91 return 0; 92 93 BIO_clear_retry_flags(b); 94 if (RAND_priv_bytes(&n, 1) <= 0) 95 return -1; 96 num = (n & 0x07); 97 98 if (outl > num) 99 outl = num; 100 101 if (num == 0) { 102 ret = -1; 103 BIO_set_retry_read(b); 104 } else { 105 ret = BIO_read(b->next_bio, out, outl); 106 if (ret < 0) 107 BIO_copy_next_retry(b); 108 } 109 return ret; 110 } 111 112 static int nbiof_write(BIO *b, const char *in, int inl) 113 { 114 NBIO_TEST *nt; 115 int ret = 0; 116 int num; 117 unsigned char n; 118 119 if ((in == NULL) || (inl <= 0)) 120 return 0; 121 if (b->next_bio == NULL) 122 return 0; 123 nt = (NBIO_TEST *)b->ptr; 124 125 BIO_clear_retry_flags(b); 126 127 if (nt->lwn > 0) { 128 num = nt->lwn; 129 nt->lwn = 0; 130 } else { 131 if (RAND_priv_bytes(&n, 1) <= 0) 132 return -1; 133 num = (n & 7); 134 } 135 136 if (inl > num) 137 inl = num; 138 139 if (num == 0) { 140 ret = -1; 141 BIO_set_retry_write(b); 142 } else { 143 ret = BIO_write(b->next_bio, in, inl); 144 if (ret < 0) { 145 BIO_copy_next_retry(b); 146 nt->lwn = inl; 147 } 148 } 149 return ret; 150 } 151 152 static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr) 153 { 154 long ret; 155 156 if (b->next_bio == NULL) 157 return 0; 158 switch (cmd) { 159 case BIO_C_DO_STATE_MACHINE: 160 BIO_clear_retry_flags(b); 161 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 162 BIO_copy_next_retry(b); 163 break; 164 case BIO_CTRL_DUP: 165 ret = 0L; 166 break; 167 default: 168 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 169 break; 170 } 171 return ret; 172 } 173 174 static long nbiof_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp) 175 { 176 long ret = 1; 177 178 if (b->next_bio == NULL) 179 return 0; 180 switch (cmd) { 181 default: 182 ret = BIO_callback_ctrl(b->next_bio, cmd, fp); 183 break; 184 } 185 return ret; 186 } 187 188 static int nbiof_gets(BIO *bp, char *buf, int size) 189 { 190 if (bp->next_bio == NULL) 191 return 0; 192 return BIO_gets(bp->next_bio, buf, size); 193 } 194 195 static int nbiof_puts(BIO *bp, const char *str) 196 { 197 if (bp->next_bio == NULL) 198 return 0; 199 return BIO_puts(bp->next_bio, str); 200 } 201