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/*
* Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "bio_local.h"
static int prefix_write(BIO *b, const char *out, size_t outl,
size_t *numwritten);
static int prefix_read(BIO *b, char *buf, size_t size, size_t *numread);
static int prefix_puts(BIO *b, const char *str);
static int prefix_gets(BIO *b, char *str, int size);
static long prefix_ctrl(BIO *b, int cmd, long arg1, void *arg2);
static int prefix_create(BIO *b);
static int prefix_destroy(BIO *b);
static long prefix_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp);
static const BIO_METHOD prefix_meth = {
BIO_TYPE_BUFFER,
"prefix",
prefix_write,
NULL,
prefix_read,
NULL,
prefix_puts,
prefix_gets,
prefix_ctrl,
prefix_create,
prefix_destroy,
prefix_callback_ctrl,
};
const BIO_METHOD *BIO_f_prefix(void)
{
return &prefix_meth;
}
typedef struct prefix_ctx_st {
char *prefix; /* Text prefix, given by user */
unsigned int indent; /* Indentation amount, given by user */
int linestart; /* flag to indicate we're at the line start */
} PREFIX_CTX;
static int prefix_create(BIO *b)
{
PREFIX_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx == NULL)
return 0;
ctx->prefix = NULL;
ctx->indent = 0;
ctx->linestart = 1;
BIO_set_data(b, ctx);
BIO_set_init(b, 1);
return 1;
}
static int prefix_destroy(BIO *b)
{
PREFIX_CTX *ctx = BIO_get_data(b);
OPENSSL_free(ctx->prefix);
OPENSSL_free(ctx);
return 1;
}
static int prefix_read(BIO *b, char *in, size_t size, size_t *numread)
{
return BIO_read_ex(BIO_next(b), in, size, numread);
}
static int prefix_write(BIO *b, const char *out, size_t outl,
size_t *numwritten)
{
PREFIX_CTX *ctx = BIO_get_data(b);
if (ctx == NULL)
return 0;
/*
* If no prefix is set or if it's empty, and no indentation amount is set,
* we've got nothing to do here
*/
if ((ctx->prefix == NULL || *ctx->prefix == '\0')
&& ctx->indent == 0) {
/*
* We do note if what comes next will be a new line, though, so we're
* prepared to handle prefix and indentation the next time around.
*/
if (outl > 0)
ctx->linestart = (out[outl-1] == '\n');
return BIO_write_ex(BIO_next(b), out, outl, numwritten);
}
*numwritten = 0;
while (outl > 0) {
size_t i;
char c;
/*
* If we know that we're at the start of the line, output prefix and
* indentation.
*/
if (ctx->linestart) {
size_t dontcare;
if (ctx->prefix != NULL
&& !BIO_write_ex(BIO_next(b), ctx->prefix, strlen(ctx->prefix),
&dontcare))
return 0;
BIO_printf(BIO_next(b), "%*s", ctx->indent, "");
ctx->linestart = 0;
}
/* Now, go look for the next LF, or the end of the string */
for (i = 0, c = '\0'; i < outl && (c = out[i]) != '\n'; i++)
continue;
if (c == '\n')
i++;
/* Output what we found so far */
while (i > 0) {
size_t num = 0;
if (!BIO_write_ex(BIO_next(b), out, i, &num))
return 0;
out += num;
outl -= num;
*numwritten += num;
i -= num;
}
/* If we found a LF, what follows is a new line, so take note */
if (c == '\n')
ctx->linestart = 1;
}
return 1;
}
static long prefix_ctrl(BIO *b, int cmd, long num, void *ptr)
{
long ret = 0;
PREFIX_CTX *ctx;
if (b == NULL || (ctx = BIO_get_data(b)) == NULL)
return -1;
switch (cmd) {
case BIO_CTRL_SET_PREFIX:
OPENSSL_free(ctx->prefix);
if (ptr == NULL) {
ctx->prefix = NULL;
ret = 1;
} else {
ctx->prefix = OPENSSL_strdup((const char *)ptr);
ret = ctx->prefix != NULL;
}
break;
case BIO_CTRL_SET_INDENT:
if (num >= 0) {
ctx->indent = (unsigned int)num;
ret = 1;
}
break;
case BIO_CTRL_GET_INDENT:
ret = (long)ctx->indent;
break;
default:
/* Commands that we intercept before passing them along */
switch (cmd) {
case BIO_C_FILE_SEEK:
case BIO_CTRL_RESET:
ctx->linestart = 1;
break;
}
if (BIO_next(b) != NULL)
ret = BIO_ctrl(BIO_next(b), cmd, num, ptr);
break;
}
return ret;
}
static long prefix_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
{
return BIO_callback_ctrl(BIO_next(b), cmd, fp);
}
static int prefix_gets(BIO *b, char *buf, int size)
{
return BIO_gets(BIO_next(b), buf, size);
}
static int prefix_puts(BIO *b, const char *str)
{
return BIO_write(b, str, strlen(str));
}
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