]>
Commit | Line | Data |
---|---|---|
9108f8d9 | 1 | /* $OpenBSD: bufaux.c,v 1.44 2006/08/03 03:34:41 deraadt Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
6 | * Auxiliary functions for storing and retrieving various data types to/from | |
7 | * Buffers. | |
8 | * | |
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". | |
14 | * | |
15 | * | |
16 | * SSH2 packet format added by Markus Friedl | |
17 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
18 | * | |
19 | * Redistribution and use in source and binary forms, with or without | |
20 | * modification, are permitted provided that the following conditions | |
21 | * are met: | |
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. | |
27 | * | |
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. | |
38 | */ | |
39 | ||
40 | #include "includes.h" | |
3c0ef626 | 41 | |
9108f8d9 | 42 | #include <sys/types.h> |
dec6d9fe | 43 | |
9108f8d9 | 44 | #include <openssl/bn.h> |
680cee3b | 45 | |
9108f8d9 | 46 | #include <string.h> |
47 | #include <stdarg.h> | |
996d5e62 | 48 | |
9108f8d9 | 49 | #include "xmalloc.h" |
50 | #include "buffer.h" | |
51 | #include "log.h" | |
52 | #include "misc.h" | |
cdd66111 | 53 | |
3c0ef626 | 54 | /* |
700318f3 | 55 | * Returns integers from the buffer (msb first). |
3c0ef626 | 56 | */ |
700318f3 | 57 | |
996d5e62 | 58 | int |
59 | buffer_get_short_ret(u_short *ret, Buffer *buffer) | |
60 | { | |
61 | u_char buf[2]; | |
62 | ||
63 | if (buffer_get_ret(buffer, (char *) buf, 2) == -1) | |
64 | return (-1); | |
9108f8d9 | 65 | *ret = get_u16(buf); |
996d5e62 | 66 | return (0); |
67 | } | |
68 | ||
700318f3 | 69 | u_short |
70 | buffer_get_short(Buffer *buffer) | |
71 | { | |
996d5e62 | 72 | u_short ret; |
73 | ||
74 | if (buffer_get_short_ret(&ret, buffer) == -1) | |
75 | fatal("buffer_get_short: buffer error"); | |
680cee3b | 76 | |
996d5e62 | 77 | return (ret); |
78 | } | |
79 | ||
80 | int | |
81 | buffer_get_int_ret(u_int *ret, Buffer *buffer) | |
82 | { | |
83 | u_char buf[4]; | |
84 | ||
85 | if (buffer_get_ret(buffer, (char *) buf, 4) == -1) | |
86 | return (-1); | |
9108f8d9 | 87 | *ret = get_u32(buf); |
996d5e62 | 88 | return (0); |
700318f3 | 89 | } |
90 | ||
3c0ef626 | 91 | u_int |
92 | buffer_get_int(Buffer *buffer) | |
93 | { | |
996d5e62 | 94 | u_int ret; |
95 | ||
96 | if (buffer_get_int_ret(&ret, buffer) == -1) | |
97 | fatal("buffer_get_int: buffer error"); | |
98 | ||
99 | return (ret); | |
100 | } | |
680cee3b | 101 | |
996d5e62 | 102 | int |
103 | buffer_get_int64_ret(u_int64_t *ret, Buffer *buffer) | |
104 | { | |
105 | u_char buf[8]; | |
106 | ||
107 | if (buffer_get_ret(buffer, (char *) buf, 8) == -1) | |
108 | return (-1); | |
9108f8d9 | 109 | *ret = get_u64(buf); |
996d5e62 | 110 | return (0); |
3c0ef626 | 111 | } |
112 | ||
3c0ef626 | 113 | u_int64_t |
114 | buffer_get_int64(Buffer *buffer) | |
115 | { | |
996d5e62 | 116 | u_int64_t ret; |
680cee3b | 117 | |
996d5e62 | 118 | if (buffer_get_int64_ret(&ret, buffer) == -1) |
119 | fatal("buffer_get_int: buffer error"); | |
120 | ||
121 | return (ret); | |
3c0ef626 | 122 | } |
3c0ef626 | 123 | |
124 | /* | |
700318f3 | 125 | * Stores integers in the buffer, msb first. |
3c0ef626 | 126 | */ |
700318f3 | 127 | void |
128 | buffer_put_short(Buffer *buffer, u_short value) | |
129 | { | |
130 | char buf[2]; | |
680cee3b | 131 | |
9108f8d9 | 132 | put_u16(buf, value); |
700318f3 | 133 | buffer_append(buffer, buf, 2); |
134 | } | |
135 | ||
3c0ef626 | 136 | void |
137 | buffer_put_int(Buffer *buffer, u_int value) | |
138 | { | |
139 | char buf[4]; | |
680cee3b | 140 | |
9108f8d9 | 141 | put_u32(buf, value); |
3c0ef626 | 142 | buffer_append(buffer, buf, 4); |
143 | } | |
144 | ||
3c0ef626 | 145 | void |
146 | buffer_put_int64(Buffer *buffer, u_int64_t value) | |
147 | { | |
148 | char buf[8]; | |
680cee3b | 149 | |
9108f8d9 | 150 | put_u64(buf, value); |
3c0ef626 | 151 | buffer_append(buffer, buf, 8); |
152 | } | |
3c0ef626 | 153 | |
154 | /* | |
155 | * Returns an arbitrary binary string from the buffer. The string cannot | |
156 | * be longer than 256k. The returned value points to memory allocated | |
157 | * with xmalloc; it is the responsibility of the calling function to free | |
158 | * the data. If length_ptr is non-NULL, the length of the returned data | |
159 | * will be stored there. A null character will be automatically appended | |
160 | * to the returned string, and is not counted in length. | |
161 | */ | |
e9a17296 | 162 | void * |
996d5e62 | 163 | buffer_get_string_ret(Buffer *buffer, u_int *length_ptr) |
3c0ef626 | 164 | { |
e9a17296 | 165 | u_char *value; |
680cee3b | 166 | u_int len; |
167 | ||
3c0ef626 | 168 | /* Get the length. */ |
169 | len = buffer_get_int(buffer); | |
996d5e62 | 170 | if (len > 256 * 1024) { |
171 | error("buffer_get_string_ret: bad string length %u", len); | |
172 | return (NULL); | |
173 | } | |
3c0ef626 | 174 | /* Allocate space for the string. Add one byte for a null character. */ |
175 | value = xmalloc(len + 1); | |
176 | /* Get the string. */ | |
996d5e62 | 177 | if (buffer_get_ret(buffer, value, len) == -1) { |
178 | error("buffer_get_string_ret: buffer_get failed"); | |
179 | xfree(value); | |
180 | return (NULL); | |
181 | } | |
3c0ef626 | 182 | /* Append a null character to make processing easier. */ |
183 | value[len] = 0; | |
184 | /* Optionally return the length of the string. */ | |
185 | if (length_ptr) | |
186 | *length_ptr = len; | |
996d5e62 | 187 | return (value); |
188 | } | |
189 | ||
190 | void * | |
191 | buffer_get_string(Buffer *buffer, u_int *length_ptr) | |
192 | { | |
193 | void *ret; | |
194 | ||
195 | if ((ret = buffer_get_string_ret(buffer, length_ptr)) == NULL) | |
196 | fatal("buffer_get_string: buffer error"); | |
197 | return (ret); | |
3c0ef626 | 198 | } |
199 | ||
200 | /* | |
201 | * Stores and arbitrary binary string in the buffer. | |
202 | */ | |
203 | void | |
204 | buffer_put_string(Buffer *buffer, const void *buf, u_int len) | |
205 | { | |
206 | buffer_put_int(buffer, len); | |
207 | buffer_append(buffer, buf, len); | |
208 | } | |
209 | void | |
210 | buffer_put_cstring(Buffer *buffer, const char *s) | |
211 | { | |
700318f3 | 212 | if (s == NULL) |
213 | fatal("buffer_put_cstring: s == NULL"); | |
3c0ef626 | 214 | buffer_put_string(buffer, s, strlen(s)); |
215 | } | |
216 | ||
217 | /* | |
218 | * Returns a character from the buffer (0 - 255). | |
219 | */ | |
996d5e62 | 220 | int |
221 | buffer_get_char_ret(char *ret, Buffer *buffer) | |
222 | { | |
223 | if (buffer_get_ret(buffer, ret, 1) == -1) { | |
224 | error("buffer_get_char_ret: buffer_get_ret failed"); | |
225 | return (-1); | |
226 | } | |
227 | return (0); | |
228 | } | |
229 | ||
3c0ef626 | 230 | int |
231 | buffer_get_char(Buffer *buffer) | |
232 | { | |
233 | char ch; | |
680cee3b | 234 | |
996d5e62 | 235 | if (buffer_get_char_ret(&ch, buffer) == -1) |
236 | fatal("buffer_get_char: buffer error"); | |
3c0ef626 | 237 | return (u_char) ch; |
238 | } | |
239 | ||
240 | /* | |
241 | * Stores a character in the buffer. | |
242 | */ | |
243 | void | |
244 | buffer_put_char(Buffer *buffer, int value) | |
245 | { | |
246 | char ch = value; | |
680cee3b | 247 | |
3c0ef626 | 248 | buffer_append(buffer, &ch, 1); |
249 | } |