Damien Miller | a0fdce9 | 2006-03-26 14:28:50 +1100 | [diff] [blame] | 1 | /* $OpenBSD: bufaux.c,v 1.40 2006/03/25 18:56:54 deraadt Exp $ */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 6 | * Auxiliary functions for storing and retrieving various data types to/from |
| 7 | * Buffers. |
| 8 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 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". |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 14 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 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. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 38 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 39 | |
| 40 | #include "includes.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 41 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 42 | #include <openssl/bn.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 43 | #include "bufaux.h" |
| 44 | #include "xmalloc.h" |
| 45 | #include "getput.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 46 | #include "log.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 47 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 48 | /* |
| 49 | * Stores an BIGNUM in the buffer with a 2-byte msb first bit count, followed |
| 50 | * by (bits+7)/8 bytes of binary data, msb first. |
| 51 | */ |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 52 | int |
| 53 | buffer_put_bignum_ret(Buffer *buffer, const BIGNUM *value) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 54 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 55 | int bits = BN_num_bits(value); |
| 56 | int bin_size = (bits + 7) / 8; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 57 | u_char *buf = xmalloc(bin_size); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 58 | int oi; |
| 59 | char msg[2]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 60 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 61 | /* Get the value of in binary */ |
| 62 | oi = BN_bn2bin(value, buf); |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 63 | if (oi != bin_size) { |
| 64 | error("buffer_put_bignum_ret: BN_bn2bin() failed: oi %d != bin_size %d", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 65 | oi, bin_size); |
Damien Miller | 5fd8b02 | 2005-11-05 16:04:36 +1100 | [diff] [blame] | 66 | xfree(buf); |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 67 | return (-1); |
| 68 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 69 | |
| 70 | /* Store the number of bits in the buffer in two bytes, msb first. */ |
| 71 | PUT_16BIT(msg, bits); |
| 72 | buffer_append(buffer, msg, 2); |
| 73 | /* Store the binary data. */ |
Damien Miller | a0fdce9 | 2006-03-26 14:28:50 +1100 | [diff] [blame] | 74 | buffer_append(buffer, buf, oi); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 75 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 76 | memset(buf, 0, bin_size); |
| 77 | xfree(buf); |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 78 | |
| 79 | return (0); |
| 80 | } |
| 81 | |
| 82 | void |
| 83 | buffer_put_bignum(Buffer *buffer, const BIGNUM *value) |
| 84 | { |
| 85 | if (buffer_put_bignum_ret(buffer, value) == -1) |
| 86 | fatal("buffer_put_bignum: buffer error"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 87 | } |
| 88 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 89 | /* |
| 90 | * Retrieves an BIGNUM from the buffer. |
| 91 | */ |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 92 | int |
| 93 | buffer_get_bignum_ret(Buffer *buffer, BIGNUM *value) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 94 | { |
Darren Tucker | c0815c9 | 2003-09-22 21:05:50 +1000 | [diff] [blame] | 95 | u_int bits, bytes; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 96 | u_char buf[2], *bin; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 97 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 98 | /* Get the number for bits. */ |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 99 | if (buffer_get_ret(buffer, (char *) buf, 2) == -1) { |
| 100 | error("buffer_get_bignum_ret: invalid length"); |
| 101 | return (-1); |
| 102 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 103 | bits = GET_16BIT(buf); |
| 104 | /* Compute the number of binary bytes that follow. */ |
| 105 | bytes = (bits + 7) / 8; |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 106 | if (bytes > 8 * 1024) { |
| 107 | error("buffer_get_bignum_ret: cannot handle BN of size %d", bytes); |
| 108 | return (-1); |
| 109 | } |
| 110 | if (buffer_len(buffer) < bytes) { |
| 111 | error("buffer_get_bignum_ret: input buffer too small"); |
| 112 | return (-1); |
| 113 | } |
Damien Miller | 4a8ed54 | 2002-01-22 23:33:31 +1100 | [diff] [blame] | 114 | bin = buffer_ptr(buffer); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 115 | BN_bin2bn(bin, bytes, value); |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 116 | if (buffer_consume_ret(buffer, bytes) == -1) { |
| 117 | error("buffer_get_bignum_ret: buffer_consume failed"); |
| 118 | return (-1); |
| 119 | } |
| 120 | return (0); |
| 121 | } |
| 122 | |
| 123 | void |
| 124 | buffer_get_bignum(Buffer *buffer, BIGNUM *value) |
| 125 | { |
| 126 | if (buffer_get_bignum_ret(buffer, value) == -1) |
| 127 | fatal("buffer_get_bignum: buffer error"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 128 | } |
| 129 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 130 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 131 | * Stores an BIGNUM in the buffer in SSH2 format. |
| 132 | */ |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 133 | int |
| 134 | buffer_put_bignum2_ret(Buffer *buffer, const BIGNUM *value) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 135 | { |
Darren Tucker | 0acc92a | 2004-02-24 09:21:41 +1100 | [diff] [blame] | 136 | u_int bytes; |
| 137 | u_char *buf; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 138 | int oi; |
Darren Tucker | c0815c9 | 2003-09-22 21:05:50 +1000 | [diff] [blame] | 139 | u_int hasnohigh = 0; |
Ben Lindstrom | e135363 | 2002-06-23 21:29:23 +0000 | [diff] [blame] | 140 | |
Darren Tucker | 0acc92a | 2004-02-24 09:21:41 +1100 | [diff] [blame] | 141 | if (BN_is_zero(value)) { |
| 142 | buffer_put_int(buffer, 0); |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 143 | return 0; |
Darren Tucker | 0acc92a | 2004-02-24 09:21:41 +1100 | [diff] [blame] | 144 | } |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 145 | if (value->neg) { |
| 146 | error("buffer_put_bignum2_ret: negative numbers not supported"); |
| 147 | return (-1); |
| 148 | } |
Darren Tucker | 0acc92a | 2004-02-24 09:21:41 +1100 | [diff] [blame] | 149 | bytes = BN_num_bytes(value) + 1; /* extra padding byte */ |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 150 | if (bytes < 2) { |
| 151 | error("buffer_put_bignum2_ret: BN too small"); |
| 152 | return (-1); |
| 153 | } |
Darren Tucker | 0acc92a | 2004-02-24 09:21:41 +1100 | [diff] [blame] | 154 | buf = xmalloc(bytes); |
Darren Tucker | 56c9598 | 2004-12-11 13:34:56 +1100 | [diff] [blame] | 155 | buf[0] = 0x00; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 156 | /* Get the value of in binary */ |
| 157 | oi = BN_bn2bin(value, buf+1); |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 158 | if (oi < 0 || (u_int)oi != bytes - 1) { |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 159 | error("buffer_put_bignum2_ret: BN_bn2bin() failed: " |
Darren Tucker | 0acc92a | 2004-02-24 09:21:41 +1100 | [diff] [blame] | 160 | "oi %d != bin_size %d", oi, bytes); |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 161 | xfree(buf); |
| 162 | return (-1); |
| 163 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 164 | hasnohigh = (buf[1] & 0x80) ? 0 : 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 165 | buffer_put_string(buffer, buf+hasnohigh, bytes-hasnohigh); |
| 166 | memset(buf, 0, bytes); |
| 167 | xfree(buf); |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 168 | return (0); |
| 169 | } |
| 170 | |
| 171 | void |
| 172 | buffer_put_bignum2(Buffer *buffer, const BIGNUM *value) |
| 173 | { |
| 174 | if (buffer_put_bignum2_ret(buffer, value) == -1) |
| 175 | fatal("buffer_put_bignum2: buffer error"); |
| 176 | } |
| 177 | |
| 178 | int |
| 179 | buffer_get_bignum2_ret(Buffer *buffer, BIGNUM *value) |
| 180 | { |
| 181 | u_int len; |
| 182 | u_char *bin; |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 183 | |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 184 | if ((bin = buffer_get_string_ret(buffer, &len)) == NULL) { |
| 185 | error("buffer_get_bignum2_ret: invalid bignum"); |
| 186 | return (-1); |
| 187 | } |
| 188 | |
| 189 | if (len > 0 && (bin[0] & 0x80)) { |
| 190 | error("buffer_get_bignum2_ret: negative numbers not supported"); |
Damien Miller | 5fd8b02 | 2005-11-05 16:04:36 +1100 | [diff] [blame] | 191 | xfree(bin); |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 192 | return (-1); |
| 193 | } |
| 194 | if (len > 8 * 1024) { |
| 195 | error("buffer_get_bignum2_ret: cannot handle BN of size %d", len); |
Damien Miller | 5fd8b02 | 2005-11-05 16:04:36 +1100 | [diff] [blame] | 196 | xfree(bin); |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 197 | return (-1); |
| 198 | } |
| 199 | BN_bin2bn(bin, len, value); |
| 200 | xfree(bin); |
| 201 | return (0); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 202 | } |
| 203 | |
Damien Miller | 76e1e36 | 2002-01-22 23:15:57 +1100 | [diff] [blame] | 204 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 205 | buffer_get_bignum2(Buffer *buffer, BIGNUM *value) |
| 206 | { |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 207 | if (buffer_get_bignum2_ret(buffer, value) == -1) |
| 208 | fatal("buffer_get_bignum2: buffer error"); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 209 | } |
Darren Tucker | 0acc92a | 2004-02-24 09:21:41 +1100 | [diff] [blame] | 210 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 211 | /* |
Damien Miller | 3b23566 | 2002-04-23 20:42:36 +1000 | [diff] [blame] | 212 | * Returns integers from the buffer (msb first). |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 213 | */ |
Damien Miller | 3b23566 | 2002-04-23 20:42:36 +1000 | [diff] [blame] | 214 | |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 215 | int |
| 216 | buffer_get_short_ret(u_short *ret, Buffer *buffer) |
Damien Miller | 3b23566 | 2002-04-23 20:42:36 +1000 | [diff] [blame] | 217 | { |
| 218 | u_char buf[2]; |
Ben Lindstrom | e135363 | 2002-06-23 21:29:23 +0000 | [diff] [blame] | 219 | |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 220 | if (buffer_get_ret(buffer, (char *) buf, 2) == -1) |
| 221 | return (-1); |
| 222 | *ret = GET_16BIT(buf); |
| 223 | return (0); |
| 224 | } |
| 225 | |
| 226 | u_short |
| 227 | buffer_get_short(Buffer *buffer) |
| 228 | { |
| 229 | u_short ret; |
| 230 | |
| 231 | if (buffer_get_short_ret(&ret, buffer) == -1) |
| 232 | fatal("buffer_get_short: buffer error"); |
| 233 | |
| 234 | return (ret); |
| 235 | } |
| 236 | |
| 237 | int |
| 238 | buffer_get_int_ret(u_int *ret, Buffer *buffer) |
| 239 | { |
| 240 | u_char buf[4]; |
| 241 | |
| 242 | if (buffer_get_ret(buffer, (char *) buf, 4) == -1) |
| 243 | return (-1); |
| 244 | *ret = GET_32BIT(buf); |
| 245 | return (0); |
Damien Miller | 3b23566 | 2002-04-23 20:42:36 +1000 | [diff] [blame] | 246 | } |
| 247 | |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 248 | u_int |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 249 | buffer_get_int(Buffer *buffer) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 250 | { |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 251 | u_int ret; |
Ben Lindstrom | e135363 | 2002-06-23 21:29:23 +0000 | [diff] [blame] | 252 | |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 253 | if (buffer_get_int_ret(&ret, buffer) == -1) |
| 254 | fatal("buffer_get_int: buffer error"); |
| 255 | |
| 256 | return (ret); |
| 257 | } |
| 258 | |
| 259 | int |
| 260 | buffer_get_int64_ret(u_int64_t *ret, Buffer *buffer) |
| 261 | { |
| 262 | u_char buf[8]; |
| 263 | |
| 264 | if (buffer_get_ret(buffer, (char *) buf, 8) == -1) |
| 265 | return (-1); |
| 266 | *ret = GET_64BIT(buf); |
| 267 | return (0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 268 | } |
| 269 | |
Ben Lindstrom | 2f959b4 | 2001-01-11 06:20:23 +0000 | [diff] [blame] | 270 | u_int64_t |
| 271 | buffer_get_int64(Buffer *buffer) |
| 272 | { |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 273 | u_int64_t ret; |
Ben Lindstrom | e135363 | 2002-06-23 21:29:23 +0000 | [diff] [blame] | 274 | |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 275 | if (buffer_get_int64_ret(&ret, buffer) == -1) |
| 276 | fatal("buffer_get_int: buffer error"); |
| 277 | |
| 278 | return (ret); |
Ben Lindstrom | 2f959b4 | 2001-01-11 06:20:23 +0000 | [diff] [blame] | 279 | } |
| 280 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 281 | /* |
Damien Miller | 3b23566 | 2002-04-23 20:42:36 +1000 | [diff] [blame] | 282 | * Stores integers in the buffer, msb first. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 283 | */ |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 284 | void |
Damien Miller | 3b23566 | 2002-04-23 20:42:36 +1000 | [diff] [blame] | 285 | buffer_put_short(Buffer *buffer, u_short value) |
| 286 | { |
| 287 | char buf[2]; |
Ben Lindstrom | e135363 | 2002-06-23 21:29:23 +0000 | [diff] [blame] | 288 | |
Damien Miller | 3b23566 | 2002-04-23 20:42:36 +1000 | [diff] [blame] | 289 | PUT_16BIT(buf, value); |
| 290 | buffer_append(buffer, buf, 2); |
| 291 | } |
| 292 | |
| 293 | void |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 294 | buffer_put_int(Buffer *buffer, u_int value) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 295 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 296 | char buf[4]; |
Ben Lindstrom | e135363 | 2002-06-23 21:29:23 +0000 | [diff] [blame] | 297 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 298 | PUT_32BIT(buf, value); |
| 299 | buffer_append(buffer, buf, 4); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 300 | } |
| 301 | |
Ben Lindstrom | 2f959b4 | 2001-01-11 06:20:23 +0000 | [diff] [blame] | 302 | void |
| 303 | buffer_put_int64(Buffer *buffer, u_int64_t value) |
| 304 | { |
| 305 | char buf[8]; |
Ben Lindstrom | e135363 | 2002-06-23 21:29:23 +0000 | [diff] [blame] | 306 | |
Ben Lindstrom | 2f959b4 | 2001-01-11 06:20:23 +0000 | [diff] [blame] | 307 | PUT_64BIT(buf, value); |
| 308 | buffer_append(buffer, buf, 8); |
| 309 | } |
| 310 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 311 | /* |
| 312 | * Returns an arbitrary binary string from the buffer. The string cannot |
| 313 | * be longer than 256k. The returned value points to memory allocated |
| 314 | * with xmalloc; it is the responsibility of the calling function to free |
| 315 | * the data. If length_ptr is non-NULL, the length of the returned data |
| 316 | * will be stored there. A null character will be automatically appended |
| 317 | * to the returned string, and is not counted in length. |
| 318 | */ |
Damien Miller | 5a6b4fe | 2001-12-21 14:56:54 +1100 | [diff] [blame] | 319 | void * |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 320 | buffer_get_string_ret(Buffer *buffer, u_int *length_ptr) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 321 | { |
Damien Miller | 5a6b4fe | 2001-12-21 14:56:54 +1100 | [diff] [blame] | 322 | u_char *value; |
Ben Lindstrom | e135363 | 2002-06-23 21:29:23 +0000 | [diff] [blame] | 323 | u_int len; |
| 324 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 325 | /* Get the length. */ |
| 326 | len = buffer_get_int(buffer); |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 327 | if (len > 256 * 1024) { |
| 328 | error("buffer_get_string_ret: bad string length %u", len); |
| 329 | return (NULL); |
| 330 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 331 | /* Allocate space for the string. Add one byte for a null character. */ |
| 332 | value = xmalloc(len + 1); |
| 333 | /* Get the string. */ |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 334 | if (buffer_get_ret(buffer, value, len) == -1) { |
| 335 | error("buffer_get_string_ret: buffer_get failed"); |
| 336 | xfree(value); |
| 337 | return (NULL); |
| 338 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 339 | /* Append a null character to make processing easier. */ |
| 340 | value[len] = 0; |
| 341 | /* Optionally return the length of the string. */ |
| 342 | if (length_ptr) |
| 343 | *length_ptr = len; |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 344 | return (value); |
| 345 | } |
| 346 | |
| 347 | void * |
| 348 | buffer_get_string(Buffer *buffer, u_int *length_ptr) |
| 349 | { |
| 350 | void *ret; |
| 351 | |
| 352 | if ((ret = buffer_get_string_ret(buffer, length_ptr)) == NULL) |
| 353 | fatal("buffer_get_string: buffer error"); |
| 354 | return (ret); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 355 | } |
| 356 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 357 | /* |
| 358 | * Stores and arbitrary binary string in the buffer. |
| 359 | */ |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 360 | void |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 361 | buffer_put_string(Buffer *buffer, const void *buf, u_int len) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 362 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 363 | buffer_put_int(buffer, len); |
| 364 | buffer_append(buffer, buf, len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 365 | } |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 366 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 367 | buffer_put_cstring(Buffer *buffer, const char *s) |
| 368 | { |
Ben Lindstrom | 88aa1b4 | 2002-03-22 01:47:52 +0000 | [diff] [blame] | 369 | if (s == NULL) |
| 370 | fatal("buffer_put_cstring: s == NULL"); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 371 | buffer_put_string(buffer, s, strlen(s)); |
| 372 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 373 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 374 | /* |
| 375 | * Returns a character from the buffer (0 - 255). |
| 376 | */ |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 377 | int |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 378 | buffer_get_char_ret(char *ret, Buffer *buffer) |
| 379 | { |
| 380 | if (buffer_get_ret(buffer, ret, 1) == -1) { |
| 381 | error("buffer_get_char_ret: buffer_get_ret failed"); |
| 382 | return (-1); |
| 383 | } |
| 384 | return (0); |
| 385 | } |
| 386 | |
| 387 | int |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 388 | buffer_get_char(Buffer *buffer) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 389 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 390 | char ch; |
Ben Lindstrom | e135363 | 2002-06-23 21:29:23 +0000 | [diff] [blame] | 391 | |
Darren Tucker | 50dbe83 | 2004-11-05 20:41:24 +1100 | [diff] [blame] | 392 | if (buffer_get_char_ret(&ch, buffer) == -1) |
| 393 | fatal("buffer_get_char: buffer error"); |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 394 | return (u_char) ch; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 395 | } |
| 396 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 397 | /* |
| 398 | * Stores a character in the buffer. |
| 399 | */ |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 400 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 401 | buffer_put_char(Buffer *buffer, int value) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 402 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 403 | char ch = value; |
Ben Lindstrom | e135363 | 2002-06-23 21:29:23 +0000 | [diff] [blame] | 404 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 405 | buffer_append(buffer, &ch, 1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 406 | } |