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 = {
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 if ((ctx = OPENSSL_malloc(sizeof(*ctx))) == NULL) {
63 BIOerr(BIO_F_LINEBUFFER_NEW, ERR_R_MALLOC_FAILURE);
66 ctx->obuf = OPENSSL_malloc(DEFAULT_LINEBUFFER_SIZE);
67 if (ctx->obuf == NULL) {
68 BIOerr(BIO_F_LINEBUFFER_NEW, ERR_R_MALLOC_FAILURE);
72 ctx->obuf_size = DEFAULT_LINEBUFFER_SIZE;
76 bi->ptr = (char *)ctx;
81 static int linebuffer_free(BIO *a)
83 BIO_LINEBUFFER_CTX *b;
87 b = (BIO_LINEBUFFER_CTX *)a->ptr;
88 OPENSSL_free(b->obuf);
96 static int linebuffer_read(BIO *b, char *out, int outl)
102 if (b->next_bio == NULL)
104 ret = BIO_read(b->next_bio, out, outl);
105 BIO_clear_retry_flags(b);
106 BIO_copy_next_retry(b);
110 static int linebuffer_write(BIO *b, const char *in, int inl)
112 int i, num = 0, foundnl;
113 BIO_LINEBUFFER_CTX *ctx;
115 if ((in == NULL) || (inl <= 0))
117 ctx = (BIO_LINEBUFFER_CTX *)b->ptr;
118 if ((ctx == NULL) || (b->next_bio == NULL))
121 BIO_clear_retry_flags(b);
127 for (p = in, c = '\0'; p < in + inl && (c = *p) != '\n'; p++) ;
135 * If a NL was found and we already have text in the save buffer,
136 * concatenate them and write
138 while ((foundnl || p - in > ctx->obuf_size - ctx->obuf_len)
139 && ctx->obuf_len > 0) {
140 int orig_olen = ctx->obuf_len;
142 i = ctx->obuf_size - ctx->obuf_len;
145 memcpy(&(ctx->obuf[ctx->obuf_len]), in, p - in);
146 ctx->obuf_len += p - in;
151 memcpy(&(ctx->obuf[ctx->obuf_len]), in, i);
158 i = BIO_write(b->next_bio, ctx->obuf, ctx->obuf_len);
160 ctx->obuf_len = orig_olen;
161 BIO_copy_next_retry(b);
164 return ((num > 0) ? num : i);
168 if (i < ctx->obuf_len)
169 memmove(ctx->obuf, ctx->obuf + i, ctx->obuf_len - i);
174 * Now that the save buffer is emptied, let's write the input buffer
175 * if a NL was found and there is anything to write.
177 if ((foundnl || p - in > ctx->obuf_size) && p - in > 0) {
178 i = BIO_write(b->next_bio, in, p - in);
180 BIO_copy_next_retry(b);
182 return ((num > 0) ? num : i);
191 while (foundnl && inl > 0);
193 * We've written as much as we can. The rest of the input buffer, if
194 * any, is text that doesn't and with a NL and therefore needs to be
195 * saved for the next trip.
198 memcpy(&(ctx->obuf[ctx->obuf_len]), in, inl);
199 ctx->obuf_len += inl;
205 static long linebuffer_ctrl(BIO *b, int cmd, long num, void *ptr)
208 BIO_LINEBUFFER_CTX *ctx;
214 ctx = (BIO_LINEBUFFER_CTX *)b->ptr;
219 if (b->next_bio == NULL)
221 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
224 ret = (long)ctx->obuf_len;
226 case BIO_CTRL_WPENDING:
227 ret = (long)ctx->obuf_len;
229 if (b->next_bio == NULL)
231 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
234 case BIO_C_SET_BUFF_SIZE:
237 if ((obs > DEFAULT_LINEBUFFER_SIZE) && (obs != ctx->obuf_size)) {
238 p = OPENSSL_malloc((int)num);
242 if (ctx->obuf != p) {
243 if (ctx->obuf_len > obs) {
246 memcpy(p, ctx->obuf, ctx->obuf_len);
247 OPENSSL_free(ctx->obuf);
249 ctx->obuf_size = obs;
252 case BIO_C_DO_STATE_MACHINE:
253 if (b->next_bio == NULL)
255 BIO_clear_retry_flags(b);
256 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
257 BIO_copy_next_retry(b);
261 if (b->next_bio == NULL)
263 if (ctx->obuf_len <= 0) {
264 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
269 BIO_clear_retry_flags(b);
270 if (ctx->obuf_len > 0) {
271 r = BIO_write(b->next_bio, ctx->obuf, ctx->obuf_len);
272 BIO_copy_next_retry(b);
275 if (r < ctx->obuf_len)
276 memmove(ctx->obuf, ctx->obuf + r, ctx->obuf_len - r);
283 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
287 if (!BIO_set_write_buffer_size(dbio, ctx->obuf_size))
291 if (b->next_bio == NULL)
293 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
298 BIOerr(BIO_F_LINEBUFFER_CTRL, ERR_R_MALLOC_FAILURE);
302 static long linebuffer_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
306 if (b->next_bio == NULL)
310 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
316 static int linebuffer_gets(BIO *b, char *buf, int size)
318 if (b->next_bio == NULL)
320 return BIO_gets(b->next_bio, buf, size);
323 static int linebuffer_puts(BIO *b, const char *str)
325 return linebuffer_write(b, str, strlen(str));