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Diff for /src/usr.bin/ssh/Attic/bufaux.c between version 1.1 and 1.42

version 1.1, 1999/09/26 20:53:33 version 1.42, 2006/04/18 10:44:28
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   /* $OpenBSD$ */
 /*  /*
    * 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.
    */
   
 bufaux.c  #include "includes.h"
   
 Author: Tatu Ylonen <ylo@cs.hut.fi>  #include <openssl/bn.h>
   #include "bufaux.h"
   #include "xmalloc.h"
   #include "log.h"
   #include "misc.h"
   
 Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland  /*
                    All rights reserved   * Returns integers from the buffer (msb first).
    */
   
 Created: Wed Mar 29 02:24:47 1995 ylo  int
   buffer_get_short_ret(u_short *ret, Buffer *buffer)
   {
           u_char buf[2];
   
 Auxiliary functions for storing and retrieving various data types to/from          if (buffer_get_ret(buffer, (char *) buf, 2) == -1)
 Buffers.                  return (-1);
           *ret = get_u16(buf);
           return (0);
   }
   
 */  u_short
   buffer_get_short(Buffer *buffer)
   {
           u_short ret;
   
 #include "includes.h"          if (buffer_get_short_ret(&ret, buffer) == -1)
 RCSID("$Id$");                  fatal("buffer_get_short: buffer error");
   
 #include "ssh.h"          return (ret);
 #include "gmp.h"  }
 #include "bufaux.h"  
 #include "xmalloc.h"  
 #include "getput.h"  
   
 /* Stores an MP_INT in the buffer with a 2-byte msb first bit count, followed  int
    by (bits+7)/8 bytes of binary data, msb first. */  buffer_get_int_ret(u_int *ret, Buffer *buffer)
   {
           u_char buf[4];
   
 void buffer_put_mp_int(Buffer *buffer, MP_INT *value)          if (buffer_get_ret(buffer, (char *) buf, 4) == -1)
                   return (-1);
           *ret = get_u32(buf);
           return (0);
   }
   
   u_int
   buffer_get_int(Buffer *buffer)
 {  {
   int bits = mpz_sizeinbase(value, 2);          u_int ret;
   int hex_size = mpz_sizeinbase(value, 16);  
   char *buf = xmalloc(hex_size + 2);  
   int i, oi, byte;  
   char msg[2];  
   
   /* Get the value of the number in hex.  Too bad that gmp does not allow  
      us to get it in binary. */  
   mpz_get_str(buf, 16, value);  
   
   /* i is "input index", oi is "output index".  Both point to the same array,          if (buffer_get_int_ret(&ret, buffer) == -1)
      and start from the beginning.  "input index" moves twice as fast. */                  fatal("buffer_get_int: buffer error");
   i = 0;  
   oi = 0;  
   /* Check for an odd number of hex digits.  Process the odd digit  
      separately. */  
   if (hex_size & 1)  
     {  
       sscanf(buf, "%1x", &byte);  
       buf[oi++] = byte;  
       i = 1;  
     }  
   
   /* Convert the hex number into binary representation. */          return (ret);
   for (; i < hex_size; i += 2)  
     {  
       sscanf(buf + i, "%2x", &byte);  
       buf[oi++] = byte;  
     }  
   
   assert(oi == ((bits + 7) / 8));  
   /* Store the number of bits in the buffer in two bytes, msb first. */  
   PUT_16BIT(msg, bits);  
   buffer_append(buffer, msg, 2);  
   /* Store the binary data. */  
   buffer_append(buffer, buf, oi);  
   /* Clear the temporary data. */  
   memset(buf, 0, hex_size);  
   xfree(buf);  
 }  }
   
 /* Retrieves an MP_INT from the buffer. */  int
   buffer_get_int64_ret(u_int64_t *ret, Buffer *buffer)
 int buffer_get_mp_int(Buffer *buffer, MP_INT *value)  
 {  {
   int i, bits, bytes;          u_char buf[8];
   char *hex;  
   unsigned char buf[2];  
   
   /* Get the number for bits. */          if (buffer_get_ret(buffer, (char *) buf, 8) == -1)
   buffer_get(buffer, (char *)buf, 2);                  return (-1);
   bits = GET_16BIT(buf);          *ret = get_u64(buf);
   /* Compute the number of binary bytes that follow. */          return (0);
   bytes = (bits + 7) / 8;  
   /* Allocate space for a corresponding hex string. */  
   hex = xmalloc(2 * bytes + 1);  
   
   /* Read and convert the binary bytes into a hex string. */  
   for (i = 0; i < bytes; i++)  
     {  
       unsigned char byte;  
       buffer_get(buffer, (char *)&byte, 1);  
       sprintf(hex + 2 * i, "%02x", byte);  
     }  
   /* Read the hex string into a mp-int. */  
   mpz_set_str(value, hex, 16);  
   /* Free the string. */  
   xfree(hex);  
   return 2 + bytes;  
 }  }
   
 /* Returns an integer from the buffer (4 bytes, msb first). */  u_int64_t
   buffer_get_int64(Buffer *buffer)
 unsigned int buffer_get_int(Buffer *buffer)  
 {  {
   unsigned char buf[4];          u_int64_t ret;
   buffer_get(buffer, (char *)buf, 4);  
   return GET_32BIT(buf);          if (buffer_get_int64_ret(&ret, buffer) == -1)
                   fatal("buffer_get_int: buffer error");
   
           return (ret);
 }  }
   
 /* Stores an integer in the buffer in 4 bytes, msb first. */  /*
    * Stores integers in the buffer, msb first.
    */
   void
   buffer_put_short(Buffer *buffer, u_short value)
   {
           char buf[2];
   
 void buffer_put_int(Buffer *buffer, unsigned int value)          put_u16(buf, value);
           buffer_append(buffer, buf, 2);
   }
   
   void
   buffer_put_int(Buffer *buffer, u_int value)
 {  {
   char buf[4];          char buf[4];
   PUT_32BIT(buf, value);  
   buffer_append(buffer, buf, 4);          put_u32(buf, value);
           buffer_append(buffer, buf, 4);
 }  }
   
 /* Returns an arbitrary binary string from the buffer.  The string cannot  void
    be longer than 256k.  The returned value points to memory allocated  buffer_put_int64(Buffer *buffer, u_int64_t value)
    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          char buf[8];
    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, unsigned int *length_ptr)          put_u64(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.
    */
   void *
   buffer_get_string_ret(Buffer *buffer, u_int *length_ptr)
 {  {
   unsigned int len;          u_char *value;
   char *value;          u_int len;
   /* Get the length. */  
   len = buffer_get_int(buffer);          /* Get the length. */
   if (len > 256*1024)          len = buffer_get_int(buffer);
     fatal("Received packet with bad string length %d", len);          if (len > 256 * 1024) {
   /* Allocate space for the string.  Add one byte for a null character. */                  error("buffer_get_string_ret: bad string length %u", len);
   value = xmalloc(len + 1);                  return (NULL);
   /* Get the string. */          }
   buffer_get(buffer, value, len);          /* Allocate space for the string.  Add one byte for a null character. */
   /* Append a null character to make processing easier. */          value = xmalloc(len + 1);
   value[len] = 0;          /* Get the string. */
   /* Optionally return the length of the string. */          if (buffer_get_ret(buffer, value, len) == -1) {
   if (length_ptr)                  error("buffer_get_string_ret: buffer_get failed");
     *length_ptr = len;                  xfree(value);
   return value;                  return (NULL);
           }
           /* 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_get_string(Buffer *buffer, u_int *length_ptr)
   {
           void *ret;
   
 void buffer_put_string(Buffer *buffer, const void *buf, unsigned int len)          if ((ret = buffer_get_string_ret(buffer, length_ptr)) == NULL)
                   fatal("buffer_get_string: buffer error");
           return (ret);
   }
   
   /*
    * 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_put_int(buffer, len);
   buffer_append(buffer, buf, len);          buffer_append(buffer, buf, len);
 }  }
   void
   buffer_put_cstring(Buffer *buffer, const char *s)
   {
           if (s == NULL)
                   fatal("buffer_put_cstring: s == NULL");
           buffer_put_string(buffer, s, strlen(s));
   }
   
 /* Returns a character from the buffer (0 - 255). */  /*
    * Returns a character from the buffer (0 - 255).
 int buffer_get_char(Buffer *buffer)   */
   int
   buffer_get_char_ret(char *ret, Buffer *buffer)
 {  {
   char ch;          if (buffer_get_ret(buffer, ret, 1) == -1) {
   buffer_get(buffer, &ch, 1);                  error("buffer_get_char_ret: buffer_get_ret failed");
   return (unsigned char)ch;                  return (-1);
           }
           return (0);
 }  }
   
 /* Stores a character in the buffer. */  int
   buffer_get_char(Buffer *buffer)
   {
           char ch;
   
 void buffer_put_char(Buffer *buffer, int value)          if (buffer_get_char_ret(&ch, buffer) == -1)
                   fatal("buffer_get_char: buffer error");
           return (u_char) ch;
   }
   
   /*
    * Stores a character in the buffer.
    */
   void
   buffer_put_char(Buffer *buffer, int value)
 {  {
   char ch = value;          char ch = value;
   buffer_append(buffer, &ch, 1);  
           buffer_append(buffer, &ch, 1);
 }  }
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