File: bufaux.c

package info (click to toggle)
yafc 1.1.1.dfsg.1-4
  • links: PTS
  • area: main
  • in suites: squeeze
  • size: 3,248 kB
  • ctags: 1,679
  • sloc: ansic: 19,338; sh: 10,365; makefile: 155; perl: 38; ruby: 33
file content (158 lines) | stat: -rw-r--r-- 4,555 bytes parent folder | download | duplicates (6)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
/* Modified for use in Yafc by Martin Hedenfalk <mhe@stacken.kth.se>
 */

/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * Auxiliary functions for storing and retrieving various data types to/from
 * Buffers.
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 *
 *
 * SSH2 packet format added by Markus Friedl
 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "syshdr.h"
#include "ftp.h"
/*#include "includes.h"*/
/*RCSID("$OpenBSD: bufaux.c,v 1.17 2001/01/21 19:05:45 markus Exp $");*/

/*#include <openssl/bn.h>*/
#include "bufaux.h"
/*#include "xmalloc.h"*/
#include "getput.h"
/*#include "log.h"*/

/* bignum functions removed ... */

/*
 * Returns an integer from the buffer (4 bytes, msb first).
 */
u_int
buffer_get_int(Buffer *buffer)
{
	u_char buf[4];
	buffer_get(buffer, (char *) buf, 4);
	return GET_32BIT(buf);
}

u_int64_t
buffer_get_int64(Buffer *buffer)
{
	u_char buf[8];
	buffer_get(buffer, (char *) buf, 8);
	return GET_64BIT(buf);
}

/*
 * Stores an integer in the buffer in 4 bytes, msb first.
 */
void
buffer_put_int(Buffer *buffer, u_int value)
{
	char buf[4];
	PUT_32BIT(buf, value);
	buffer_append(buffer, buf, 4);
}

void
buffer_put_int64(Buffer *buffer, u_int64_t value)
{
	char buf[8];
	PUT_64BIT(buf, value);
	buffer_append(buffer, buf, 8);
}

/*
 * Returns an arbitrary binary string from the buffer.  The string cannot
 * be longer than 256k.  The returned value points to memory allocated
 * with xmalloc; it is the responsibility of the calling function to free
 * the data.  If length_ptr is non-NULL, the length of the returned data
 * will be stored there.  A null character will be automatically appended
 * to the returned string, and is not counted in length.
 */
char *
buffer_get_string(Buffer *buffer, u_int *length_ptr)
{
	u_int len;
	char *value;
	/* Get the length. */
	len = buffer_get_int(buffer);
	if (len > 256 * 1024) {
		ftp_err("Received packet with bad string length %d", len);
		return 0;
	}
	/* Allocate space for the string.  Add one byte for a null character. */
	value = xmalloc(len + 1);
	/* Get the string. */
	buffer_get(buffer, value, len);
	/* Append a null character to make processing easier. */
	value[len] = 0;
	/* Optionally return the length of the string. */
	if (length_ptr)
		*length_ptr = len;
	return value;
}

/*
 * Stores and arbitrary binary string in the buffer.
 */
void
buffer_put_string(Buffer *buffer, const void *buf, u_int len)
{
	buffer_put_int(buffer, len);
	buffer_append(buffer, buf, len);
}
void
buffer_put_cstring(Buffer *buffer, const char *s)
{
	buffer_put_string(buffer, s, strlen(s));
}

/*
 * Returns a character from the buffer (0 - 255).
 */
int
buffer_get_char(Buffer *buffer)
{
	char ch;
	buffer_get(buffer, &ch, 1);
	return (u_char) ch;
}

/*
 * Stores a character in the buffer.
 */
void
buffer_put_char(Buffer *buffer, int value)
{
	char ch = value;
	buffer_append(buffer, &ch, 1);
}