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