2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
13 #include "internal/cryptlib.h"
14 #include <openssl/evp.h>
16 static int linebuffer_write(BIO *h, const char *buf, int num);
17 static int linebuffer_read(BIO *h, char *buf, int size);
18 static int linebuffer_puts(BIO *h, const char *str);
19 static int linebuffer_gets(BIO *h, char *str, int size);
20 static long linebuffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
21 static int linebuffer_new(BIO *h);
22 static int linebuffer_free(BIO *data);
23 static long linebuffer_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
25 /* A 10k maximum should be enough for most purposes */
26 #define DEFAULT_LINEBUFFER_SIZE 1024*10
30 static const BIO_METHOD methods_linebuffer = {
40 linebuffer_callback_ctrl,
43 const BIO_METHOD *BIO_f_linebuffer(void)
45 return (&methods_linebuffer);
48 typedef struct bio_linebuffer_ctx_struct {
49 char *obuf; /* the output char array */
50 int obuf_size; /* how big is the output buffer */
51 int obuf_len; /* how many bytes are in it */
54 static int linebuffer_new(BIO *bi)
56 BIO_LINEBUFFER_CTX *ctx;
58 ctx = OPENSSL_malloc(sizeof(*ctx));
61 ctx->obuf = OPENSSL_malloc(DEFAULT_LINEBUFFER_SIZE);
62 if (ctx->obuf == NULL) {
66 ctx->obuf_size = DEFAULT_LINEBUFFER_SIZE;
70 bi->ptr = (char *)ctx;
75 static int linebuffer_free(BIO *a)
77 BIO_LINEBUFFER_CTX *b;
81 b = (BIO_LINEBUFFER_CTX *)a->ptr;
82 OPENSSL_free(b->obuf);
90 static int linebuffer_read(BIO *b, char *out, int outl)
96 if (b->next_bio == NULL)
98 ret = BIO_read(b->next_bio, out, outl);
99 BIO_clear_retry_flags(b);
100 BIO_copy_next_retry(b);
104 static int linebuffer_write(BIO *b, const char *in, int inl)
106 int i, num = 0, foundnl;
107 BIO_LINEBUFFER_CTX *ctx;
109 if ((in == NULL) || (inl <= 0))
111 ctx = (BIO_LINEBUFFER_CTX *)b->ptr;
112 if ((ctx == NULL) || (b->next_bio == NULL))
115 BIO_clear_retry_flags(b);
121 for (p = in, c = '\0'; p < in + inl && (c = *p) != '\n'; p++) ;
129 * If a NL was found and we already have text in the save buffer,
130 * concatenate them and write
132 while ((foundnl || p - in > ctx->obuf_size - ctx->obuf_len)
133 && ctx->obuf_len > 0) {
134 int orig_olen = ctx->obuf_len;
136 i = ctx->obuf_size - ctx->obuf_len;
139 memcpy(&(ctx->obuf[ctx->obuf_len]), in, p - in);
140 ctx->obuf_len += p - in;
145 memcpy(&(ctx->obuf[ctx->obuf_len]), in, i);
152 i = BIO_write(b->next_bio, ctx->obuf, ctx->obuf_len);
154 ctx->obuf_len = orig_olen;
155 BIO_copy_next_retry(b);
158 return ((num > 0) ? num : i);
162 if (i < ctx->obuf_len)
163 memmove(ctx->obuf, ctx->obuf + i, ctx->obuf_len - i);
168 * Now that the save buffer is emptied, let's write the input buffer
169 * if a NL was found and there is anything to write.
171 if ((foundnl || p - in > ctx->obuf_size) && p - in > 0) {
172 i = BIO_write(b->next_bio, in, p - in);
174 BIO_copy_next_retry(b);
176 return ((num > 0) ? num : i);
185 while (foundnl && inl > 0);
187 * We've written as much as we can. The rest of the input buffer, if
188 * any, is text that doesn't and with a NL and therefore needs to be
189 * saved for the next trip.
192 memcpy(&(ctx->obuf[ctx->obuf_len]), in, inl);
193 ctx->obuf_len += inl;
199 static long linebuffer_ctrl(BIO *b, int cmd, long num, void *ptr)
202 BIO_LINEBUFFER_CTX *ctx;
208 ctx = (BIO_LINEBUFFER_CTX *)b->ptr;
213 if (b->next_bio == NULL)
215 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
218 ret = (long)ctx->obuf_len;
220 case BIO_CTRL_WPENDING:
221 ret = (long)ctx->obuf_len;
223 if (b->next_bio == NULL)
225 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
228 case BIO_C_SET_BUFF_SIZE:
231 if ((obs > DEFAULT_LINEBUFFER_SIZE) && (obs != ctx->obuf_size)) {
232 p = OPENSSL_malloc((int)num);
236 if (ctx->obuf != p) {
237 if (ctx->obuf_len > obs) {
240 memcpy(p, ctx->obuf, ctx->obuf_len);
241 OPENSSL_free(ctx->obuf);
243 ctx->obuf_size = obs;
246 case BIO_C_DO_STATE_MACHINE:
247 if (b->next_bio == NULL)
249 BIO_clear_retry_flags(b);
250 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
251 BIO_copy_next_retry(b);
255 if (b->next_bio == NULL)
257 if (ctx->obuf_len <= 0) {
258 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
263 BIO_clear_retry_flags(b);
264 if (ctx->obuf_len > 0) {
265 r = BIO_write(b->next_bio, ctx->obuf, ctx->obuf_len);
266 BIO_copy_next_retry(b);
269 if (r < ctx->obuf_len)
270 memmove(ctx->obuf, ctx->obuf + r, ctx->obuf_len - r);
277 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
281 if (!BIO_set_write_buffer_size(dbio, ctx->obuf_size))
285 if (b->next_bio == NULL)
287 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
292 BIOerr(BIO_F_LINEBUFFER_CTRL, ERR_R_MALLOC_FAILURE);
296 static long linebuffer_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
300 if (b->next_bio == NULL)
304 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
310 static int linebuffer_gets(BIO *b, char *buf, int size)
312 if (b->next_bio == NULL)
314 return (BIO_gets(b->next_bio, buf, size));
317 static int linebuffer_puts(BIO *b, const char *str)
319 return (linebuffer_write(b, str, strlen(str)));