X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/610cd5c69abf954f120a0f45c907617e597b2f75..e2b1fb42a45e8c82657b337e3039bec141e9c77f:/bufaux.c diff --git a/bufaux.c b/bufaux.c index 422584bd..b17256db 100644 --- a/bufaux.c +++ b/bufaux.c @@ -1,34 +1,49 @@ /* - * - * bufaux.c - * * Author: Tatu Ylonen - * * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland * All rights reserved - * - * Created: Wed Mar 29 02:24:47 1995 ylo - * * 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 "includes.h" -RCSID("$Id$"); - -#include "ssh.h" +RCSID("$OpenBSD: bufaux.c,v 1.17 2001/01/21 19:05:45 markus Exp $"); -#ifdef HAVE_OPENSSL #include -#endif -#ifdef HAVE_SSL -#include -#endif - #include "bufaux.h" #include "xmalloc.h" #include "getput.h" +#include "log.h" /* * Stores an BIGNUM in the buffer with a 2-byte msb first bit count, followed @@ -39,7 +54,7 @@ buffer_put_bignum(Buffer *buffer, BIGNUM *value) { int bits = BN_num_bits(value); int bin_size = (bits + 7) / 8; - char unsigned *buf = xmalloc(bin_size); + u_char *buf = xmalloc(bin_size); int oi; char msg[2]; @@ -66,7 +81,7 @@ int buffer_get_bignum(Buffer *buffer, BIGNUM *value) { int bits, bytes; - unsigned char buf[2], *bin; + u_char buf[2], *bin; /* Get the number for bits. */ buffer_get(buffer, (char *) buf, 2); @@ -75,35 +90,99 @@ buffer_get_bignum(Buffer *buffer, BIGNUM *value) bytes = (bits + 7) / 8; if (buffer_len(buffer) < bytes) fatal("buffer_get_bignum: input buffer too small"); - bin = (unsigned char*) buffer_ptr(buffer); + bin = (u_char *) buffer_ptr(buffer); BN_bin2bn(bin, bytes, value); buffer_consume(buffer, bytes); return 2 + bytes; } +/* + * Stores an BIGNUM in the buffer in SSH2 format. + */ +void +buffer_put_bignum2(Buffer *buffer, BIGNUM *value) +{ + int bytes = BN_num_bytes(value) + 1; + u_char *buf = xmalloc(bytes); + int oi; + int hasnohigh = 0; + buf[0] = '\0'; + /* Get the value of in binary */ + oi = BN_bn2bin(value, buf+1); + if (oi != bytes-1) + fatal("buffer_put_bignum: BN_bn2bin() failed: oi %d != bin_size %d", + oi, bytes); + hasnohigh = (buf[1] & 0x80) ? 0 : 1; + if (value->neg) { + /**XXX should be two's-complement */ + int i, carry; + u_char *uc = buf; + log("negativ!"); + for(i = bytes-1, carry = 1; i>=0; i--) { + uc[i] ^= 0xff; + if(carry) + carry = !++uc[i]; + } + } + buffer_put_string(buffer, buf+hasnohigh, bytes-hasnohigh); + memset(buf, 0, bytes); + xfree(buf); +} + +int +buffer_get_bignum2(Buffer *buffer, BIGNUM *value) +{ + /**XXX should be two's-complement */ + int len; + u_char *bin = (u_char *)buffer_get_string(buffer, (u_int *)&len); + BN_bin2bn(bin, len, value); + xfree(bin); + return len; +} + /* * Returns an integer from the buffer (4 bytes, msb first). */ -unsigned int +u_int buffer_get_int(Buffer *buffer) { - unsigned char buf[4]; + u_char buf[4]; buffer_get(buffer, (char *) buf, 4); return GET_32BIT(buf); } +#ifdef HAVE_U_INT64_T +u_int64_t +buffer_get_int64(Buffer *buffer) +{ + u_char buf[8]; + buffer_get(buffer, (char *) buf, 8); + return GET_64BIT(buf); +} +#endif + /* * Stores an integer in the buffer in 4 bytes, msb first. */ -void -buffer_put_int(Buffer *buffer, unsigned int value) +void +buffer_put_int(Buffer *buffer, u_int value) { char buf[4]; PUT_32BIT(buf, value); buffer_append(buffer, buf, 4); } +#ifdef HAVE_U_INT64_T +void +buffer_put_int64(Buffer *buffer, u_int64_t value) +{ + char buf[8]; + PUT_64BIT(buf, value); + buffer_append(buffer, buf, 8); +} +#endif + /* * Returns an arbitrary binary string from the buffer. The string cannot * be longer than 256k. The returned value points to memory allocated @@ -113,9 +192,9 @@ buffer_put_int(Buffer *buffer, unsigned int value) * to the returned string, and is not counted in length. */ char * -buffer_get_string(Buffer *buffer, unsigned int *length_ptr) +buffer_get_string(Buffer *buffer, u_int *length_ptr) { - unsigned int len; + u_int len; char *value; /* Get the length. */ len = buffer_get_int(buffer); @@ -136,28 +215,33 @@ buffer_get_string(Buffer *buffer, unsigned int *length_ptr) /* * Stores and arbitrary binary string in the buffer. */ -void -buffer_put_string(Buffer *buffer, const void *buf, unsigned int len) +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 +int buffer_get_char(Buffer *buffer) { char ch; buffer_get(buffer, &ch, 1); - return (unsigned char) ch; + return (u_char) ch; } /* * Stores a character in the buffer. */ -void +void buffer_put_char(Buffer *buffer, int value) { char ch = value;