summaryrefslogtreecommitdiff
path: root/other/openssh-2.1.1p4/bufaux.c
diff options
context:
space:
mode:
Diffstat (limited to 'other/openssh-2.1.1p4/bufaux.c')
-rw-r--r--other/openssh-2.1.1p4/bufaux.c209
1 files changed, 0 insertions, 209 deletions
diff --git a/other/openssh-2.1.1p4/bufaux.c b/other/openssh-2.1.1p4/bufaux.c
deleted file mode 100644
index ecf529f..0000000
--- a/other/openssh-2.1.1p4/bufaux.c
+++ /dev/null
@@ -1,209 +0,0 @@
1/*
2 *
3 * bufaux.c
4 *
5 * Author: Tatu Ylonen <ylo@cs.hut.fi>
6 *
7 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8 * All rights reserved
9 *
10 * Created: Wed Mar 29 02:24:47 1995 ylo
11 *
12 * Auxiliary functions for storing and retrieving various data types to/from
13 * Buffers.
14 *
15 * SSH2 packet format added by Markus Friedl
16 *
17 */
18
19#include "includes.h"
20RCSID("$OpenBSD: bufaux.c,v 1.12 2000/06/20 01:39:39 markus Exp $");
21
22#include "ssh.h"
23#include <openssl/bn.h>
24#include "bufaux.h"
25#include "xmalloc.h"
26#include "getput.h"
27
28/*
29 * Stores an BIGNUM in the buffer with a 2-byte msb first bit count, followed
30 * by (bits+7)/8 bytes of binary data, msb first.
31 */
32void
33buffer_put_bignum(Buffer *buffer, BIGNUM *value)
34{
35 int bits = BN_num_bits(value);
36 int bin_size = (bits + 7) / 8;
37 char unsigned *buf = xmalloc(bin_size);
38 int oi;
39 char msg[2];
40
41 /* Get the value of in binary */
42 oi = BN_bn2bin(value, buf);
43 if (oi != bin_size)
44 fatal("buffer_put_bignum: BN_bn2bin() failed: oi %d != bin_size %d",
45 oi, bin_size);
46
47 /* Store the number of bits in the buffer in two bytes, msb first. */
48 PUT_16BIT(msg, bits);
49 buffer_append(buffer, msg, 2);
50 /* Store the binary data. */
51 buffer_append(buffer, (char *)buf, oi);
52
53 memset(buf, 0, bin_size);
54 xfree(buf);
55}
56
57/*
58 * Retrieves an BIGNUM from the buffer.
59 */
60int
61buffer_get_bignum(Buffer *buffer, BIGNUM *value)
62{
63 int bits, bytes;
64 unsigned char buf[2], *bin;
65
66 /* Get the number for bits. */
67 buffer_get(buffer, (char *) buf, 2);
68 bits = GET_16BIT(buf);
69 /* Compute the number of binary bytes that follow. */
70 bytes = (bits + 7) / 8;
71 if (buffer_len(buffer) < bytes)
72 fatal("buffer_get_bignum: input buffer too small");
73 bin = (unsigned char*) buffer_ptr(buffer);
74 BN_bin2bn(bin, bytes, value);
75 buffer_consume(buffer, bytes);
76
77 return 2 + bytes;
78}
79
80/*
81 * Stores an BIGNUM in the buffer in SSH2 format.
82 */
83void
84buffer_put_bignum2(Buffer *buffer, BIGNUM *value)
85{
86 int bytes = BN_num_bytes(value) + 1;
87 unsigned char *buf = xmalloc(bytes);
88 int oi;
89 int hasnohigh = 0;
90 buf[0] = '\0';
91 /* Get the value of in binary */
92 oi = BN_bn2bin(value, buf+1);
93 if (oi != bytes-1)
94 fatal("buffer_put_bignum: BN_bn2bin() failed: oi %d != bin_size %d",
95 oi, bytes);
96 hasnohigh = (buf[1] & 0x80) ? 0 : 1;
97 if (value->neg) {
98 /**XXX should be two's-complement */
99 int i, carry;
100 unsigned char *uc = buf;
101 log("negativ!");
102 for(i = bytes-1, carry = 1; i>=0; i--) {
103 uc[i] ^= 0xff;
104 if(carry)
105 carry = !++uc[i];
106 }
107 }
108 buffer_put_string(buffer, buf+hasnohigh, bytes-hasnohigh);
109 memset(buf, 0, bytes);
110 xfree(buf);
111}
112
113int
114buffer_get_bignum2(Buffer *buffer, BIGNUM *value)
115{
116 /**XXX should be two's-complement */
117 int len;
118 unsigned char *bin = (unsigned char *)buffer_get_string(buffer, (unsigned int *)&len);
119 BN_bin2bn(bin, len, value);
120 xfree(bin);
121 return len;
122}
123
124/*
125 * Returns an integer from the buffer (4 bytes, msb first).
126 */
127unsigned int
128buffer_get_int(Buffer *buffer)
129{
130 unsigned char buf[4];
131 buffer_get(buffer, (char *) buf, 4);
132 return GET_32BIT(buf);
133}
134
135/*
136 * Stores an integer in the buffer in 4 bytes, msb first.
137 */
138void
139buffer_put_int(Buffer *buffer, unsigned int value)
140{
141 char buf[4];
142 PUT_32BIT(buf, value);
143 buffer_append(buffer, buf, 4);
144}
145
146/*
147 * Returns an arbitrary binary string from the buffer. The string cannot
148 * be longer than 256k. The returned value points to memory allocated
149 * with xmalloc; it is the responsibility of the calling function to free
150 * the data. If length_ptr is non-NULL, the length of the returned data
151 * will be stored there. A null character will be automatically appended
152 * to the returned string, and is not counted in length.
153 */
154char *
155buffer_get_string(Buffer *buffer, unsigned int *length_ptr)
156{
157 unsigned int len;
158 char *value;
159 /* Get the length. */
160 len = buffer_get_int(buffer);
161 if (len > 256 * 1024)
162 fatal("Received packet with bad string length %d", len);
163 /* Allocate space for the string. Add one byte for a null character. */
164 value = xmalloc(len + 1);
165 /* Get the string. */
166 buffer_get(buffer, value, len);
167 /* Append a null character to make processing easier. */
168 value[len] = 0;
169 /* Optionally return the length of the string. */
170 if (length_ptr)
171 *length_ptr = len;
172 return value;
173}
174
175/*
176 * Stores and arbitrary binary string in the buffer.
177 */
178void
179buffer_put_string(Buffer *buffer, const void *buf, unsigned int len)
180{
181 buffer_put_int(buffer, len);
182 buffer_append(buffer, buf, len);
183}
184void
185buffer_put_cstring(Buffer *buffer, const char *s)
186{
187 buffer_put_string(buffer, s, strlen(s));
188}
189
190/*
191 * Returns a character from the buffer (0 - 255).
192 */
193int
194buffer_get_char(Buffer *buffer)
195{
196 char ch;
197 buffer_get(buffer, &ch, 1);
198 return (unsigned char) ch;
199}
200
201/*
202 * Stores a character in the buffer.
203 */
204void
205buffer_put_char(Buffer *buffer, int value)
206{
207 char ch = value;
208 buffer_append(buffer, &ch, 1);
209}