2021-03-09 15:25:26 +08:00
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/*
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* Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* This is a read only BIO filter that can be used to add BIO_tell() and
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* BIO_seek() support to source/sink BIO's (such as a file BIO that uses stdin).
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* It does this by caching ALL data read from the BIO source/sink into a
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* resizable memory buffer.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include "bio_local.h"
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#include "internal/cryptlib.h"
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#define DEFAULT_BUFFER_SIZE 4096
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static int readbuffer_write(BIO *h, const char *buf, int num);
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static int readbuffer_read(BIO *h, char *buf, int size);
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static int readbuffer_puts(BIO *h, const char *str);
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static int readbuffer_gets(BIO *h, char *str, int size);
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static long readbuffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int readbuffer_new(BIO *h);
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static int readbuffer_free(BIO *data);
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static long readbuffer_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
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static const BIO_METHOD methods_readbuffer = {
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BIO_TYPE_BUFFER,
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"readbuffer",
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bwrite_conv,
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readbuffer_write,
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bread_conv,
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readbuffer_read,
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readbuffer_puts,
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readbuffer_gets,
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readbuffer_ctrl,
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readbuffer_new,
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readbuffer_free,
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readbuffer_callback_ctrl,
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};
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const BIO_METHOD *BIO_f_readbuffer(void)
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{
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return &methods_readbuffer;
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}
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static int readbuffer_new(BIO *bi)
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{
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BIO_F_BUFFER_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
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if (ctx == NULL)
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return 0;
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ctx->ibuf_size = DEFAULT_BUFFER_SIZE;
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2021-03-18 13:00:23 +08:00
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ctx->ibuf = OPENSSL_zalloc(DEFAULT_BUFFER_SIZE);
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2021-03-09 15:25:26 +08:00
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if (ctx->ibuf == NULL) {
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OPENSSL_free(ctx);
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return 0;
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}
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bi->init = 1;
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bi->ptr = (char *)ctx;
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bi->flags = 0;
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return 1;
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}
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static int readbuffer_free(BIO *a)
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{
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BIO_F_BUFFER_CTX *b;
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if (a == NULL)
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return 0;
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b = (BIO_F_BUFFER_CTX *)a->ptr;
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OPENSSL_free(b->ibuf);
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OPENSSL_free(a->ptr);
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a->ptr = NULL;
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a->init = 0;
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a->flags = 0;
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return 1;
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}
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static int readbuffer_resize(BIO_F_BUFFER_CTX *ctx, int sz)
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{
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char *tmp;
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/* Figure out how many blocks are required */
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sz += (ctx->ibuf_off + DEFAULT_BUFFER_SIZE - 1);
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sz = DEFAULT_BUFFER_SIZE * (sz / DEFAULT_BUFFER_SIZE);
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/* Resize if the buffer is not big enough */
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if (sz > ctx->ibuf_size) {
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tmp = OPENSSL_realloc(ctx->ibuf, sz);
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if (tmp == NULL)
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return 0;
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ctx->ibuf = tmp;
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ctx->ibuf_size = sz;
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}
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return 1;
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}
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static int readbuffer_read(BIO *b, char *out, int outl)
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{
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int i, num = 0;
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BIO_F_BUFFER_CTX *ctx;
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if (out == NULL || outl == 0)
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return 0;
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ctx = (BIO_F_BUFFER_CTX *)b->ptr;
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if ((ctx == NULL) || (b->next_bio == NULL))
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return 0;
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BIO_clear_retry_flags(b);
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for (;;) {
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i = ctx->ibuf_len;
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/* If there is something in the buffer just read it. */
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if (i != 0) {
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if (i > outl)
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i = outl;
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memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i);
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ctx->ibuf_off += i;
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ctx->ibuf_len -= i;
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num += i;
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/* Exit if we have read the bytes required out of the buffer */
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if (outl == i)
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return num;
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outl -= i;
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out += i;
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}
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/* Only gets here if the buffer has been consumed */
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if (!readbuffer_resize(ctx, outl))
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return 0;
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/* Do some buffering by reading from the next bio */
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i = BIO_read(b->next_bio, ctx->ibuf + ctx->ibuf_off, outl);
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if (i <= 0) {
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BIO_copy_next_retry(b);
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if (i < 0)
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return ((num > 0) ? num : i);
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else
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return num; /* i == 0 */
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}
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ctx->ibuf_len = i;
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}
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}
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static int readbuffer_write(BIO *b, const char *in, int inl)
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{
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return 0;
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}
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static int readbuffer_puts(BIO *b, const char *str)
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{
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return 0;
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}
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static long readbuffer_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
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BIO_F_BUFFER_CTX *ctx;
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long ret = 1, sz;
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ctx = (BIO_F_BUFFER_CTX *)b->ptr;
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switch (cmd) {
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case BIO_CTRL_EOF:
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if (ctx->ibuf_len > 0)
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return 0;
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if (b->next_bio == NULL)
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return 1;
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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case BIO_C_FILE_SEEK:
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case BIO_CTRL_RESET:
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sz = ctx->ibuf_off + ctx->ibuf_len;
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/* Assume it can only seek backwards */
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if (num < 0 || num > sz)
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return 0;
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ctx->ibuf_off = num;
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ctx->ibuf_len = sz - num;
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break;
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case BIO_C_FILE_TELL:
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case BIO_CTRL_INFO:
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ret = (long)ctx->ibuf_off;
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break;
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case BIO_CTRL_PENDING:
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ret = (long)ctx->ibuf_len;
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if (ret == 0) {
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if (b->next_bio == NULL)
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return 0;
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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}
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break;
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case BIO_CTRL_DUP:
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case BIO_CTRL_FLUSH:
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ret = 1;
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break;
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default:
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ret = 0;
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break;
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}
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return ret;
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}
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static long readbuffer_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
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{
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if (b->next_bio == NULL)
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return 0;
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return BIO_callback_ctrl(b->next_bio, cmd, fp);
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}
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static int readbuffer_gets(BIO *b, char *buf, int size)
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{
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BIO_F_BUFFER_CTX *ctx;
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int num = 0, num_chars, found_newline;
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char *p;
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2021-03-18 13:00:23 +08:00
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int i, j;
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2021-03-09 15:25:26 +08:00
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if (size == 0)
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return 0;
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--size; /* the passed in size includes the terminator - so remove it here */
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ctx = (BIO_F_BUFFER_CTX *)b->ptr;
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BIO_clear_retry_flags(b);
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2021-03-18 13:00:23 +08:00
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/* If data is already buffered then use this first */
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if (ctx->ibuf_len > 0) {
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p = ctx->ibuf + ctx->ibuf_off;
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found_newline = 0;
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for (num_chars = 0;
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(num_chars < ctx->ibuf_len) && (num_chars < size);
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num_chars++) {
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*buf++ = p[num_chars];
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if (p[num_chars] == '\n') {
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found_newline = 1;
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num_chars++;
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break;
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2021-03-09 15:25:26 +08:00
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}
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2021-03-18 13:00:23 +08:00
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}
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num += num_chars;
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size -= num_chars;
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ctx->ibuf_len -= num_chars;
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ctx->ibuf_off += num_chars;
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if (found_newline || size == 0) {
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*buf = '\0';
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return num;
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2021-03-09 15:25:26 +08:00
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}
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}
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2021-03-18 13:00:23 +08:00
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/*
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* If there is no buffered data left then read any remaining data from the
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* next bio.
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*/
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/* Resize if we have to */
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if (!readbuffer_resize(ctx, 1 + size))
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return 0;
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/*
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* Read more data from the next bio using BIO_read_ex:
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* Note we cannot use BIO_gets() here as it does not work on a
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* binary stream that contains 0x00. (Since strlen() will stop at
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* any 0x00 not at the last read '\n' in a FILE bio).
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* Also note that some applications open and close the file bio
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* multiple times and need to read the next available block when using
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* stdin - so we need to READ one byte at a time!
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*/
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p = ctx->ibuf + ctx->ibuf_off;
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for (i = 0; i < size; ++i) {
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j = BIO_read(b->next_bio, p, 1);
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if (j <= 0) {
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BIO_copy_next_retry(b);
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*buf = '\0';
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return num > 0 ? num : j;
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}
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*buf++ = *p;
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num++;
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ctx->ibuf_off++;
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if (*p == '\n')
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break;
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++p;
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}
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*buf = '\0';
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return num;
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2021-03-09 15:25:26 +08:00
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}
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