1 /* $OpenBSD: bufaux.c,v 1.49 2010/03/26 03:13:17 djm Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * Auxiliary functions for storing and retrieving various data types to/from
9 * As far as I am concerned, the code I have written for this software
10 * can be used freely for any purpose. Any derived versions of this
11 * software must be clearly marked as such, and if the derived work is
12 * incompatible with the protocol description in the RFC file, it must be
13 * called by a name other than "ssh" or "Secure Shell".
16 * SSH2 packet format added by Markus Friedl
17 * Copyright (c) 2000 Markus Friedl. All rights reserved.
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
22 * 1. Redistributions of source code must retain the above copyright
23 * notice, this list of conditions and the following disclaimer.
24 * 2. Redistributions in binary form must reproduce the above copyright
25 * notice, this list of conditions and the following disclaimer in the
26 * documentation and/or other materials provided with the distribution.
28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
29 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
30 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
31 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
33 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
37 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 #include <sys/types.h>
44 #include <openssl/bn.h>
55 * Returns integers from the buffer (msb first).
59 buffer_get_short_ret(u_short *ret, Buffer *buffer)
63 if (buffer_get_ret(buffer, (char *) buf, 2) == -1)
70 buffer_get_short(Buffer *buffer)
74 if (buffer_get_short_ret(&ret, buffer) == -1)
75 fatal("buffer_get_short: buffer error");
81 buffer_get_int_ret(u_int *ret, Buffer *buffer)
85 if (buffer_get_ret(buffer, (char *) buf, 4) == -1)
93 buffer_get_int(Buffer *buffer)
97 if (buffer_get_int_ret(&ret, buffer) == -1)
98 fatal("buffer_get_int: buffer error");
104 buffer_get_int64_ret(u_int64_t *ret, Buffer *buffer)
108 if (buffer_get_ret(buffer, (char *) buf, 8) == -1)
116 buffer_get_int64(Buffer *buffer)
120 if (buffer_get_int64_ret(&ret, buffer) == -1)
121 fatal("buffer_get_int: buffer error");
127 * Stores integers in the buffer, msb first.
130 buffer_put_short(Buffer *buffer, u_short value)
135 buffer_append(buffer, buf, 2);
139 buffer_put_int(Buffer *buffer, u_int value)
144 buffer_append(buffer, buf, 4);
148 buffer_put_int64(Buffer *buffer, u_int64_t value)
153 buffer_append(buffer, buf, 8);
157 * Returns an arbitrary binary string from the buffer. The string cannot
158 * be longer than 256k. The returned value points to memory allocated
159 * with xmalloc; it is the responsibility of the calling function to free
160 * the data. If length_ptr is non-NULL, the length of the returned data
161 * will be stored there. A null character will be automatically appended
162 * to the returned string, and is not counted in length.
165 buffer_get_string_ret(Buffer *buffer, u_int *length_ptr)
170 /* Get the length. */
171 if (buffer_get_int_ret(&len, buffer) != 0) {
172 error("buffer_get_string_ret: cannot extract length");
175 if (len > 256 * 1024) {
176 error("buffer_get_string_ret: bad string length %u", len);
179 /* Allocate space for the string. Add one byte for a null character. */
180 value = xmalloc(len + 1);
181 /* Get the string. */
182 if (buffer_get_ret(buffer, value, len) == -1) {
183 error("buffer_get_string_ret: buffer_get failed");
187 /* Append a null character to make processing easier. */
189 /* Optionally return the length of the string. */
196 buffer_get_string(Buffer *buffer, u_int *length_ptr)
200 if ((ret = buffer_get_string_ret(buffer, length_ptr)) == NULL)
201 fatal("buffer_get_string: buffer error");
206 buffer_get_string_ptr_ret(Buffer *buffer, u_int *length_ptr)
211 if (buffer_get_int_ret(&len, buffer) != 0)
213 if (len > 256 * 1024) {
214 error("buffer_get_string_ptr: bad string length %u", len);
217 ptr = buffer_ptr(buffer);
218 buffer_consume(buffer, len);
225 buffer_get_string_ptr(Buffer *buffer, u_int *length_ptr)
229 if ((ret = buffer_get_string_ptr_ret(buffer, length_ptr)) == NULL)
230 fatal("buffer_get_string_ptr: buffer error");
235 * Stores and arbitrary binary string in the buffer.
238 buffer_put_string(Buffer *buffer, const void *buf, u_int len)
240 buffer_put_int(buffer, len);
241 buffer_append(buffer, buf, len);
244 buffer_put_cstring(Buffer *buffer, const char *s)
247 fatal("buffer_put_cstring: s == NULL");
248 buffer_put_string(buffer, s, strlen(s));
252 * Returns a character from the buffer (0 - 255).
255 buffer_get_char_ret(char *ret, Buffer *buffer)
257 if (buffer_get_ret(buffer, ret, 1) == -1) {
258 error("buffer_get_char_ret: buffer_get_ret failed");
265 buffer_get_char(Buffer *buffer)
269 if (buffer_get_char_ret(&ch, buffer) == -1)
270 fatal("buffer_get_char: buffer error");
275 * Stores a character in the buffer.
278 buffer_put_char(Buffer *buffer, int value)
282 buffer_append(buffer, &ch, 1);