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Diff for /src/usr.bin/ssh/Attic/bufaux.c between version 1.1 and 1.60

version 1.1, 1999/09/26 20:53:33 version 1.60, 2014/04/30 05:29:56
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   /* $OpenBSD$ */
 /*  /*
    * Copyright (c) 2012 Damien Miller <djm@mindrot.org>
    *
    * Permission to use, copy, modify, and distribute this software for any
    * purpose with or without fee is hereby granted, provided that the above
    * copyright notice and this permission notice appear in all copies.
    *
    * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
    * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
    * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    */
   
 bufaux.c  /* Emulation wrappers for legacy OpenSSH buffer API atop sshbuf */
   
 Author: Tatu Ylonen <ylo@cs.hut.fi>  #include <sys/types.h>
   
 Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland  #include "buffer.h"
                    All rights reserved  #include "log.h"
   #include "ssherr.h"
   
 Created: Wed Mar 29 02:24:47 1995 ylo  int
   buffer_get_short_ret(u_short *v, Buffer *buffer)
   {
           int ret;
   
 Auxiliary functions for storing and retrieving various data types to/from          if ((ret = sshbuf_get_u16(buffer, v)) != 0) {
 Buffers.                  error("%s: %s", __func__, ssh_err(ret));
                   return -1;
           }
           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("%s: buffer error", __func__);
   
 #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 *v, Buffer *buffer)
   {
           int ret;
   
 void buffer_put_mp_int(Buffer *buffer, MP_INT *value)          if ((ret = sshbuf_get_u32(buffer, v)) != 0) {
                   error("%s: %s", __func__, ssh_err(ret));
                   return -1;
           }
           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("%s: buffer error", __func__);
   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 *v, Buffer *buffer)
   {
           int ret;
   
 int buffer_get_mp_int(Buffer *buffer, MP_INT *value)          if ((ret = sshbuf_get_u64(buffer, v)) != 0) {
                   error("%s: %s", __func__, ssh_err(ret));
                   return -1;
           }
           return 0;
   }
   
   u_int64_t
   buffer_get_int64(Buffer *buffer)
 {  {
   int i, bits, bytes;          u_int64_t ret;
   char *hex;  
   unsigned char buf[2];  
   
   /* Get the number for bits. */          if (buffer_get_int64_ret(&ret, buffer) == -1)
   buffer_get(buffer, (char *)buf, 2);                  fatal("%s: buffer error", __func__);
   bits = GET_16BIT(buf);  
   /* Compute the number of binary bytes that follow. */          return (ret);
   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). */  void
   buffer_put_short(Buffer *buffer, u_short value)
   {
           int ret;
   
 unsigned int buffer_get_int(Buffer *buffer)          if ((ret = sshbuf_put_u16(buffer, value)) != 0)
                   fatal("%s: %s", __func__, ssh_err(ret));
   }
   
   void
   buffer_put_int(Buffer *buffer, u_int value)
 {  {
   unsigned char buf[4];          int ret;
   buffer_get(buffer, (char *)buf, 4);  
   return GET_32BIT(buf);          if ((ret = sshbuf_put_u32(buffer, value)) != 0)
                   fatal("%s: %s", __func__, ssh_err(ret));
 }  }
   
 /* Stores an integer in the buffer in 4 bytes, msb first. */  void
   buffer_put_int64(Buffer *buffer, u_int64_t value)
   {
           int ret;
   
 void buffer_put_int(Buffer *buffer, unsigned int value)          if ((ret = sshbuf_put_u64(buffer, value)) != 0)
                   fatal("%s: %s", __func__, ssh_err(ret));
   }
   
   void *
   buffer_get_string_ret(Buffer *buffer, u_int *length_ptr)
 {  {
   char buf[4];          size_t len;
   PUT_32BIT(buf, value);          int ret;
   buffer_append(buffer, buf, 4);          u_char *value;
   
           if ((ret = sshbuf_get_string(buffer, &value, &len)) != 0) {
                   error("%s: %s", __func__, ssh_err(ret));
                   return NULL;
           }
           if (length_ptr != NULL)
                   *length_ptr = len;  /* Safe: sshbuf never stores len > 2^31 */
           return value;
 }  }
   
 /* Returns an arbitrary binary string from the buffer.  The string cannot  void *
    be longer than 256k.  The returned value points to memory allocated  buffer_get_string(Buffer *buffer, u_int *length_ptr)
    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          void *ret;
    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)          if ((ret = buffer_get_string_ret(buffer, length_ptr)) == NULL)
                   fatal("%s: buffer error", __func__);
           return (ret);
   }
   
   char *
   buffer_get_cstring_ret(Buffer *buffer, u_int *length_ptr)
 {  {
   unsigned int len;          size_t len;
   char *value;          int ret;
   /* Get the length. */          char *value;
   len = buffer_get_int(buffer);  
   if (len > 256*1024)          if ((ret = sshbuf_get_cstring(buffer, &value, &len)) != 0) {
     fatal("Received packet with bad string length %d", len);                  error("%s: %s", __func__, ssh_err(ret));
   /* Allocate space for the string.  Add one byte for a null character. */                  return NULL;
   value = xmalloc(len + 1);          }
   /* Get the string. */          if (length_ptr != NULL)
   buffer_get(buffer, value, len);                  *length_ptr = len;  /* Safe: sshbuf never stores len > 2^31 */
   /* Append a null character to make processing easier. */          return value;
   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. */  char *
   buffer_get_cstring(Buffer *buffer, u_int *length_ptr)
   {
           char *ret;
   
 void buffer_put_string(Buffer *buffer, const void *buf, unsigned int len)          if ((ret = buffer_get_cstring_ret(buffer, length_ptr)) == NULL)
                   fatal("%s: buffer error", __func__);
           return ret;
   }
   
   const void *
   buffer_get_string_ptr_ret(Buffer *buffer, u_int *length_ptr)
 {  {
   buffer_put_int(buffer, len);          size_t len;
   buffer_append(buffer, buf, len);          int ret;
           const u_char *value;
   
           if ((ret = sshbuf_get_string_direct(buffer, &value, &len)) != 0) {
                   error("%s: %s", __func__, ssh_err(ret));
                   return NULL;
           }
           if (length_ptr != NULL)
                   *length_ptr = len;  /* Safe: sshbuf never stores len > 2^31 */
           return value;
 }  }
   
 /* Returns a character from the buffer (0 - 255). */  const void *
   buffer_get_string_ptr(Buffer *buffer, u_int *length_ptr)
   {
           const void *ret;
   
 int buffer_get_char(Buffer *buffer)          if ((ret = buffer_get_string_ptr_ret(buffer, length_ptr)) == NULL)
                   fatal("%s: buffer error", __func__);
           return (ret);
   }
   
   void
   buffer_put_string(Buffer *buffer, const void *buf, u_int len)
 {  {
   char ch;          int ret;
   buffer_get(buffer, &ch, 1);  
   return (unsigned char)ch;          if ((ret = sshbuf_put_string(buffer, buf, len)) != 0)
                   fatal("%s: %s", __func__, ssh_err(ret));
 }  }
   
 /* Stores a character in the buffer. */  void
   buffer_put_cstring(Buffer *buffer, const char *s)
   {
           int ret;
   
 void buffer_put_char(Buffer *buffer, int value)          if ((ret = sshbuf_put_cstring(buffer, s)) != 0)
                   fatal("%s: %s", __func__, ssh_err(ret));
   }
   
   int
   buffer_get_char_ret(char *v, Buffer *buffer)
 {  {
   char ch = value;          int ret;
   buffer_append(buffer, &ch, 1);  
           if ((ret = sshbuf_get_u8(buffer, (u_char *)v)) != 0) {
                   error("%s: %s", __func__, ssh_err(ret));
                   return -1;
           }
           return 0;
 }  }
   
   int
   buffer_get_char(Buffer *buffer)
   {
           char ch;
   
           if (buffer_get_char_ret(&ch, buffer) == -1)
                   fatal("%s: buffer error", __func__);
           return (u_char) ch;
   }
   
   void
   buffer_put_char(Buffer *buffer, int value)
   {
           int ret;
   
           if ((ret = sshbuf_put_u8(buffer, value)) != 0)
                   fatal("%s: %s", __func__, ssh_err(ret));
   }
   
   void
   buffer_put_bignum2_from_string(Buffer *buffer, const u_char *s, u_int l)
   {
           int ret;
   
           if ((ret = sshbuf_put_bignum2_bytes(buffer, s, l)) != 0)
                   fatal("%s: %s", __func__, ssh_err(ret));
   }
   
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Removed from v.1.1  
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  Added in v.1.60