[331] | 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 |
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| 13 | #include "bio_lcl.h"
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| 14 |
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| 15 | #if defined(OPENSSL_NO_POSIX_IO)
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| 16 | /*
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| 17 | * Dummy placeholder for BIO_s_fd...
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| 18 | */
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| 19 | BIO *BIO_new_fd(int fd, int close_flag)
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| 20 | {
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| 21 | return NULL;
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| 22 | }
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| 23 |
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| 24 | int BIO_fd_non_fatal_error(int err)
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| 25 | {
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| 26 | return 0;
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| 27 | }
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| 28 |
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| 29 | int BIO_fd_should_retry(int i)
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| 30 | {
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| 31 | return 0;
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| 32 | }
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| 33 |
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| 34 | const BIO_METHOD *BIO_s_fd(void)
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| 35 | {
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| 36 | return NULL;
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| 37 | }
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| 38 | #else
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| 39 | /*
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| 40 | * As for unconditional usage of "UPLINK" interface in this module.
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| 41 | * Trouble is that unlike Unix file descriptors [which are indexes
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| 42 | * in kernel-side per-process table], corresponding descriptors on
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| 43 | * platforms which require "UPLINK" interface seem to be indexes
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| 44 | * in a user-land, non-global table. Well, in fact they are indexes
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| 45 | * in stdio _iob[], and recall that _iob[] was the very reason why
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| 46 | * "UPLINK" interface was introduced in first place. But one way on
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| 47 | * another. Neither libcrypto or libssl use this BIO meaning that
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| 48 | * file descriptors can only be provided by application. Therefore
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| 49 | * "UPLINK" calls are due...
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| 50 | */
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| 51 | static int fd_write(BIO *h, const char *buf, int num);
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| 52 | static int fd_read(BIO *h, char *buf, int size);
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| 53 | static int fd_puts(BIO *h, const char *str);
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| 54 | static int fd_gets(BIO *h, char *buf, int size);
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| 55 | static long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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| 56 | static int fd_new(BIO *h);
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| 57 | static int fd_free(BIO *data);
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| 58 | int BIO_fd_should_retry(int s);
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| 59 |
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| 60 | static const BIO_METHOD methods_fdp = {
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| 61 | BIO_TYPE_FD, "file descriptor",
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| 62 | fd_write,
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| 63 | fd_read,
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| 64 | fd_puts,
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| 65 | fd_gets,
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| 66 | fd_ctrl,
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| 67 | fd_new,
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| 68 | fd_free,
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| 69 | NULL,
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| 70 | };
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| 71 |
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| 72 | const BIO_METHOD *BIO_s_fd(void)
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| 73 | {
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| 74 | return (&methods_fdp);
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| 75 | }
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| 76 |
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| 77 | BIO *BIO_new_fd(int fd, int close_flag)
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| 78 | {
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| 79 | BIO *ret;
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| 80 | ret = BIO_new(BIO_s_fd());
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| 81 | if (ret == NULL)
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| 82 | return (NULL);
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| 83 | BIO_set_fd(ret, fd, close_flag);
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| 84 | return (ret);
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| 85 | }
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| 86 |
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| 87 | static int fd_new(BIO *bi)
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| 88 | {
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| 89 | bi->init = 0;
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| 90 | bi->num = -1;
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| 91 | bi->ptr = NULL;
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| 92 | bi->flags = BIO_FLAGS_UPLINK; /* essentially redundant */
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| 93 | return (1);
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| 94 | }
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| 95 |
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| 96 | static int fd_free(BIO *a)
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| 97 | {
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| 98 | if (a == NULL)
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| 99 | return (0);
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| 100 | if (a->shutdown) {
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| 101 | if (a->init) {
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| 102 | UP_close(a->num);
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| 103 | }
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| 104 | a->init = 0;
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| 105 | a->flags = BIO_FLAGS_UPLINK;
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| 106 | }
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| 107 | return (1);
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| 108 | }
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| 109 |
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| 110 | static int fd_read(BIO *b, char *out, int outl)
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| 111 | {
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| 112 | int ret = 0;
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| 113 |
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| 114 | if (out != NULL) {
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| 115 | clear_sys_error();
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| 116 | ret = UP_read(b->num, out, outl);
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| 117 | BIO_clear_retry_flags(b);
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| 118 | if (ret <= 0) {
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| 119 | if (BIO_fd_should_retry(ret))
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| 120 | BIO_set_retry_read(b);
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| 121 | }
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| 122 | }
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| 123 | return (ret);
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| 124 | }
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| 125 |
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| 126 | static int fd_write(BIO *b, const char *in, int inl)
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| 127 | {
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| 128 | int ret;
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| 129 | clear_sys_error();
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| 130 | ret = UP_write(b->num, in, inl);
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| 131 | BIO_clear_retry_flags(b);
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| 132 | if (ret <= 0) {
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| 133 | if (BIO_fd_should_retry(ret))
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| 134 | BIO_set_retry_write(b);
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| 135 | }
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| 136 | return (ret);
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| 137 | }
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| 138 |
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| 139 | static long fd_ctrl(BIO *b, int cmd, long num, void *ptr)
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| 140 | {
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| 141 | long ret = 1;
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| 142 | int *ip;
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| 143 |
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| 144 | switch (cmd) {
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| 145 | case BIO_CTRL_RESET:
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| 146 | num = 0;
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| 147 | case BIO_C_FILE_SEEK:
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| 148 | ret = (long)UP_lseek(b->num, num, 0);
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| 149 | break;
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| 150 | case BIO_C_FILE_TELL:
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| 151 | case BIO_CTRL_INFO:
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| 152 | ret = (long)UP_lseek(b->num, 0, 1);
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| 153 | break;
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| 154 | case BIO_C_SET_FD:
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| 155 | fd_free(b);
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| 156 | b->num = *((int *)ptr);
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| 157 | b->shutdown = (int)num;
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| 158 | b->init = 1;
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| 159 | break;
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| 160 | case BIO_C_GET_FD:
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| 161 | if (b->init) {
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| 162 | ip = (int *)ptr;
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| 163 | if (ip != NULL)
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| 164 | *ip = b->num;
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| 165 | ret = b->num;
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| 166 | } else
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| 167 | ret = -1;
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| 168 | break;
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| 169 | case BIO_CTRL_GET_CLOSE:
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| 170 | ret = b->shutdown;
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| 171 | break;
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| 172 | case BIO_CTRL_SET_CLOSE:
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| 173 | b->shutdown = (int)num;
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| 174 | break;
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| 175 | case BIO_CTRL_PENDING:
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| 176 | case BIO_CTRL_WPENDING:
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| 177 | ret = 0;
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| 178 | break;
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| 179 | case BIO_CTRL_DUP:
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| 180 | case BIO_CTRL_FLUSH:
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| 181 | ret = 1;
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| 182 | break;
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| 183 | default:
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| 184 | ret = 0;
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| 185 | break;
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| 186 | }
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| 187 | return (ret);
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| 188 | }
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| 189 |
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| 190 | static int fd_puts(BIO *bp, const char *str)
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| 191 | {
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| 192 | int n, ret;
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| 193 |
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| 194 | n = strlen(str);
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| 195 | ret = fd_write(bp, str, n);
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| 196 | return (ret);
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| 197 | }
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| 198 |
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| 199 | static int fd_gets(BIO *bp, char *buf, int size)
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| 200 | {
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| 201 | int ret = 0;
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| 202 | char *ptr = buf;
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| 203 | char *end = buf + size - 1;
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| 204 |
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| 205 | while ((ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n'))
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| 206 | ptr++;
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| 207 |
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| 208 | ptr[0] = '\0';
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| 209 |
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| 210 | if (buf[0] != '\0')
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| 211 | ret = strlen(buf);
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| 212 | return (ret);
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| 213 | }
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| 214 |
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| 215 | int BIO_fd_should_retry(int i)
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| 216 | {
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| 217 | int err;
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| 218 |
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| 219 | if ((i == 0) || (i == -1)) {
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| 220 | err = get_last_sys_error();
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| 221 |
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| 222 | return (BIO_fd_non_fatal_error(err));
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| 223 | }
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| 224 | return (0);
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| 225 | }
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| 226 |
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| 227 | int BIO_fd_non_fatal_error(int err)
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| 228 | {
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| 229 | switch (err) {
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| 230 |
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| 231 | # ifdef EWOULDBLOCK
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| 232 | # ifdef WSAEWOULDBLOCK
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| 233 | # if WSAEWOULDBLOCK != EWOULDBLOCK
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| 234 | case EWOULDBLOCK:
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| 235 | # endif
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| 236 | # else
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| 237 | case EWOULDBLOCK:
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| 238 | # endif
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| 239 | # endif
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| 240 |
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| 241 | # if defined(ENOTCONN)
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| 242 | case ENOTCONN:
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| 243 | # endif
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| 244 |
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| 245 | # ifdef EINTR
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| 246 | case EINTR:
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| 247 | # endif
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| 248 |
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| 249 | # ifdef EAGAIN
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| 250 | # if EWOULDBLOCK != EAGAIN
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| 251 | case EAGAIN:
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| 252 | # endif
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| 253 | # endif
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| 254 |
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| 255 | # ifdef EPROTO
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| 256 | case EPROTO:
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| 257 | # endif
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| 258 |
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| 259 | # ifdef EINPROGRESS
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| 260 | case EINPROGRESS:
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| 261 | # endif
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| 262 |
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| 263 | # ifdef EALREADY
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| 264 | case EALREADY:
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| 265 | # endif
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| 266 | return (1);
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| 267 | /* break; */
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| 268 | default:
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| 269 | break;
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| 270 | }
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| 271 | return (0);
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| 272 | }
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| 273 | #endif
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