openssl/crypto/bio/bf_lbuf.c

327 lines
8.7 KiB
C

/*
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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 <errno.h>
#include "bio_local.h"
#include "internal/cryptlib.h"
#include <openssl/evp.h>
static int linebuffer_write(BIO *h, const char *buf, int num);
static int linebuffer_read(BIO *h, char *buf, int size);
static int linebuffer_puts(BIO *h, const char *str);
static int linebuffer_gets(BIO *h, char *str, int size);
static long linebuffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int linebuffer_new(BIO *h);
static int linebuffer_free(BIO *data);
static long linebuffer_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
/* A 10k maximum should be enough for most purposes */
#define DEFAULT_LINEBUFFER_SIZE 1024*10
/* #define DEBUG */
static const BIO_METHOD methods_linebuffer = {
BIO_TYPE_LINEBUFFER,
"linebuffer",
/* TODO: Convert to new style write function */
bwrite_conv,
linebuffer_write,
/* TODO: Convert to new style read function */
bread_conv,
linebuffer_read,
linebuffer_puts,
linebuffer_gets,
linebuffer_ctrl,
linebuffer_new,
linebuffer_free,
linebuffer_callback_ctrl,
};
const BIO_METHOD *BIO_f_linebuffer(void)
{
return &methods_linebuffer;
}
typedef struct bio_linebuffer_ctx_struct {
char *obuf; /* the output char array */
int obuf_size; /* how big is the output buffer */
int obuf_len; /* how many bytes are in it */
} BIO_LINEBUFFER_CTX;
static int linebuffer_new(BIO *bi)
{
BIO_LINEBUFFER_CTX *ctx;
if ((ctx = OPENSSL_malloc(sizeof(*ctx))) == NULL) {
BIOerr(BIO_F_LINEBUFFER_NEW, ERR_R_MALLOC_FAILURE);
return 0;
}
ctx->obuf = OPENSSL_malloc(DEFAULT_LINEBUFFER_SIZE);
if (ctx->obuf == NULL) {
BIOerr(BIO_F_LINEBUFFER_NEW, ERR_R_MALLOC_FAILURE);
OPENSSL_free(ctx);
return 0;
}
ctx->obuf_size = DEFAULT_LINEBUFFER_SIZE;
ctx->obuf_len = 0;
bi->init = 1;
bi->ptr = (char *)ctx;
bi->flags = 0;
return 1;
}
static int linebuffer_free(BIO *a)
{
BIO_LINEBUFFER_CTX *b;
if (a == NULL)
return 0;
b = (BIO_LINEBUFFER_CTX *)a->ptr;
OPENSSL_free(b->obuf);
OPENSSL_free(a->ptr);
a->ptr = NULL;
a->init = 0;
a->flags = 0;
return 1;
}
static int linebuffer_read(BIO *b, char *out, int outl)
{
int ret = 0;
if (out == NULL)
return 0;
if (b->next_bio == NULL)
return 0;
ret = BIO_read(b->next_bio, out, outl);
BIO_clear_retry_flags(b);
BIO_copy_next_retry(b);
return ret;
}
static int linebuffer_write(BIO *b, const char *in, int inl)
{
int i, num = 0, foundnl;
BIO_LINEBUFFER_CTX *ctx;
if ((in == NULL) || (inl <= 0))
return 0;
ctx = (BIO_LINEBUFFER_CTX *)b->ptr;
if ((ctx == NULL) || (b->next_bio == NULL))
return 0;
BIO_clear_retry_flags(b);
do {
const char *p;
char c;
for (p = in, c = '\0'; p < in + inl && (c = *p) != '\n'; p++) ;
if (c == '\n') {
p++;
foundnl = 1;
} else
foundnl = 0;
/*
* If a NL was found and we already have text in the save buffer,
* concatenate them and write
*/
while ((foundnl || p - in > ctx->obuf_size - ctx->obuf_len)
&& ctx->obuf_len > 0) {
int orig_olen = ctx->obuf_len;
i = ctx->obuf_size - ctx->obuf_len;
if (p - in > 0) {
if (i >= p - in) {
memcpy(&(ctx->obuf[ctx->obuf_len]), in, p - in);
ctx->obuf_len += p - in;
inl -= p - in;
num += p - in;
in = p;
} else {
memcpy(&(ctx->obuf[ctx->obuf_len]), in, i);
ctx->obuf_len += i;
inl -= i;
in += i;
num += i;
}
}
i = BIO_write(b->next_bio, ctx->obuf, ctx->obuf_len);
if (i <= 0) {
ctx->obuf_len = orig_olen;
BIO_copy_next_retry(b);
if (i < 0)
return ((num > 0) ? num : i);
if (i == 0)
return num;
}
if (i < ctx->obuf_len)
memmove(ctx->obuf, ctx->obuf + i, ctx->obuf_len - i);
ctx->obuf_len -= i;
}
/*
* Now that the save buffer is emptied, let's write the input buffer
* if a NL was found and there is anything to write.
*/
if ((foundnl || p - in > ctx->obuf_size) && p - in > 0) {
i = BIO_write(b->next_bio, in, p - in);
if (i <= 0) {
BIO_copy_next_retry(b);
if (i < 0)
return ((num > 0) ? num : i);
if (i == 0)
return num;
}
num += i;
in += i;
inl -= i;
}
}
while (foundnl && inl > 0);
/*
* We've written as much as we can. The rest of the input buffer, if
* any, is text that doesn't and with a NL and therefore needs to be
* saved for the next trip.
*/
if (inl > 0) {
memcpy(&(ctx->obuf[ctx->obuf_len]), in, inl);
ctx->obuf_len += inl;
num += inl;
}
return num;
}
static long linebuffer_ctrl(BIO *b, int cmd, long num, void *ptr)
{
BIO *dbio;
BIO_LINEBUFFER_CTX *ctx;
long ret = 1;
char *p;
int r;
int obs;
ctx = (BIO_LINEBUFFER_CTX *)b->ptr;
switch (cmd) {
case BIO_CTRL_RESET:
ctx->obuf_len = 0;
if (b->next_bio == NULL)
return 0;
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
break;
case BIO_CTRL_INFO:
ret = (long)ctx->obuf_len;
break;
case BIO_CTRL_WPENDING:
ret = (long)ctx->obuf_len;
if (ret == 0) {
if (b->next_bio == NULL)
return 0;
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
}
break;
case BIO_C_SET_BUFF_SIZE:
obs = (int)num;
p = ctx->obuf;
if ((obs > DEFAULT_LINEBUFFER_SIZE) && (obs != ctx->obuf_size)) {
p = OPENSSL_malloc((int)num);
if (p == NULL)
goto malloc_error;
}
if (ctx->obuf != p) {
if (ctx->obuf_len > obs) {
ctx->obuf_len = obs;
}
memcpy(p, ctx->obuf, ctx->obuf_len);
OPENSSL_free(ctx->obuf);
ctx->obuf = p;
ctx->obuf_size = obs;
}
break;
case BIO_C_DO_STATE_MACHINE:
if (b->next_bio == NULL)
return 0;
BIO_clear_retry_flags(b);
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
BIO_copy_next_retry(b);
break;
case BIO_CTRL_FLUSH:
if (b->next_bio == NULL)
return 0;
if (ctx->obuf_len <= 0) {
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
break;
}
for (;;) {
BIO_clear_retry_flags(b);
if (ctx->obuf_len > 0) {
r = BIO_write(b->next_bio, ctx->obuf, ctx->obuf_len);
BIO_copy_next_retry(b);
if (r <= 0)
return (long)r;
if (r < ctx->obuf_len)
memmove(ctx->obuf, ctx->obuf + r, ctx->obuf_len - r);
ctx->obuf_len -= r;
} else {
ctx->obuf_len = 0;
break;
}
}
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
break;
case BIO_CTRL_DUP:
dbio = (BIO *)ptr;
if (!BIO_set_write_buffer_size(dbio, ctx->obuf_size))
ret = 0;
break;
default:
if (b->next_bio == NULL)
return 0;
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
break;
}
return ret;
malloc_error:
BIOerr(BIO_F_LINEBUFFER_CTRL, ERR_R_MALLOC_FAILURE);
return 0;
}
static long linebuffer_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
{
long ret = 1;
if (b->next_bio == NULL)
return 0;
switch (cmd) {
default:
ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
break;
}
return ret;
}
static int linebuffer_gets(BIO *b, char *buf, int size)
{
if (b->next_bio == NULL)
return 0;
return BIO_gets(b->next_bio, buf, size);
}
static int linebuffer_puts(BIO *b, const char *str)
{
return linebuffer_write(b, str, strlen(str));
}