2 * Copyright 1995-2016 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 = {
33 /* TODO: Convert to new style write function */
36 /* TODO: Convert to new style read function */
44 linebuffer_callback_ctrl,
47 const BIO_METHOD *BIO_f_linebuffer(void)
49 return &methods_linebuffer;
52 typedef struct bio_linebuffer_ctx_struct {
53 char *obuf; /* the output char array */
54 int obuf_size; /* how big is the output buffer */
55 int obuf_len; /* how many bytes are in it */
58 static int linebuffer_new(BIO *bi)
60 BIO_LINEBUFFER_CTX *ctx;
62 ctx = OPENSSL_malloc(sizeof(*ctx));
65 ctx->obuf = OPENSSL_malloc(DEFAULT_LINEBUFFER_SIZE);
66 if (ctx->obuf == NULL) {
70 ctx->obuf_size = DEFAULT_LINEBUFFER_SIZE;
74 bi->ptr = (char *)ctx;
79 static int linebuffer_free(BIO *a)
81 BIO_LINEBUFFER_CTX *b;
85 b = (BIO_LINEBUFFER_CTX *)a->ptr;
86 OPENSSL_free(b->obuf);
94 static int linebuffer_read(BIO *b, char *out, int outl)
100 if (b->next_bio == NULL)
102 ret = BIO_read(b->next_bio, out, outl);
103 BIO_clear_retry_flags(b);
104 BIO_copy_next_retry(b);
108 static int linebuffer_write(BIO *b, const char *in, int inl)
110 int i, num = 0, foundnl;
111 BIO_LINEBUFFER_CTX *ctx;
113 if ((in == NULL) || (inl <= 0))
115 ctx = (BIO_LINEBUFFER_CTX *)b->ptr;
116 if ((ctx == NULL) || (b->next_bio == NULL))
119 BIO_clear_retry_flags(b);
124 for (p = in; p < in + inl && *p != '\n'; p++) ;
132 * If a NL was found and we already have text in the save buffer,
133 * concatenate them and write
135 while ((foundnl || p - in > ctx->obuf_size - ctx->obuf_len)
136 && ctx->obuf_len > 0) {
137 int orig_olen = ctx->obuf_len;
139 i = ctx->obuf_size - ctx->obuf_len;
142 memcpy(&(ctx->obuf[ctx->obuf_len]), in, p - in);
143 ctx->obuf_len += p - in;
148 memcpy(&(ctx->obuf[ctx->obuf_len]), in, i);
155 i = BIO_write(b->next_bio, ctx->obuf, ctx->obuf_len);
157 ctx->obuf_len = orig_olen;
158 BIO_copy_next_retry(b);
161 return ((num > 0) ? num : i);
165 if (i < ctx->obuf_len)
166 memmove(ctx->obuf, ctx->obuf + i, ctx->obuf_len - i);
171 * Now that the save buffer is emptied, let's write the input buffer
172 * if a NL was found and there is anything to write.
174 if ((foundnl || p - in > ctx->obuf_size) && p - in > 0) {
175 i = BIO_write(b->next_bio, in, p - in);
177 BIO_copy_next_retry(b);
179 return ((num > 0) ? num : i);
188 while (foundnl && inl > 0);
190 * We've written as much as we can. The rest of the input buffer, if
191 * any, is text that doesn't and with a NL and therefore needs to be
192 * saved for the next trip.
195 memcpy(&(ctx->obuf[ctx->obuf_len]), in, inl);
196 ctx->obuf_len += inl;
202 static long linebuffer_ctrl(BIO *b, int cmd, long num, void *ptr)
205 BIO_LINEBUFFER_CTX *ctx;
211 ctx = (BIO_LINEBUFFER_CTX *)b->ptr;
216 if (b->next_bio == NULL)
218 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
221 ret = (long)ctx->obuf_len;
223 case BIO_CTRL_WPENDING:
224 ret = (long)ctx->obuf_len;
226 if (b->next_bio == NULL)
228 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
231 case BIO_C_SET_BUFF_SIZE:
234 if ((obs > DEFAULT_LINEBUFFER_SIZE) && (obs != ctx->obuf_size)) {
235 p = OPENSSL_malloc((int)num);
239 if (ctx->obuf != p) {
240 if (ctx->obuf_len > obs) {
243 memcpy(p, ctx->obuf, ctx->obuf_len);
244 OPENSSL_free(ctx->obuf);
246 ctx->obuf_size = obs;
249 case BIO_C_DO_STATE_MACHINE:
250 if (b->next_bio == NULL)
252 BIO_clear_retry_flags(b);
253 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
254 BIO_copy_next_retry(b);
258 if (b->next_bio == NULL)
260 if (ctx->obuf_len <= 0) {
261 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
266 BIO_clear_retry_flags(b);
267 if (ctx->obuf_len > 0) {
268 r = BIO_write(b->next_bio, ctx->obuf, ctx->obuf_len);
269 BIO_copy_next_retry(b);
272 if (r < ctx->obuf_len)
273 memmove(ctx->obuf, ctx->obuf + r, ctx->obuf_len - r);
280 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
284 if (!BIO_set_write_buffer_size(dbio, ctx->obuf_size))
288 if (b->next_bio == NULL)
290 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
295 BIOerr(BIO_F_LINEBUFFER_CTRL, ERR_R_MALLOC_FAILURE);
299 static long linebuffer_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
303 if (b->next_bio == NULL)
307 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
313 static int linebuffer_gets(BIO *b, char *buf, int size)
315 if (b->next_bio == NULL)
317 return BIO_gets(b->next_bio, buf, size);
320 static int linebuffer_puts(BIO *b, const char *str)
322 return linebuffer_write(b, str, strlen(str));