-/* $OpenBSD: bufaux.c,v 1.46 2008/06/10 23:21:34 dtucker Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
*/
#include "includes.h"
-
-#include <sys/types.h>
+RCSID("$OpenBSD: bufaux.c,v 1.17 2001/01/21 19:05:45 markus Exp $");
#include <openssl/bn.h>
-
-#include <string.h>
-#include <stdarg.h>
-
+#include "bufaux.h"
#include "xmalloc.h"
-#include "buffer.h"
+#include "getput.h"
#include "log.h"
-#include "misc.h"
/*
- * Returns integers from the buffer (msb first).
+ * Stores an BIGNUM in the buffer with a 2-byte msb first bit count, followed
+ * by (bits+7)/8 bytes of binary data, msb first.
*/
-
-int
-buffer_get_short_ret(u_short *ret, Buffer *buffer)
+void
+buffer_put_bignum(Buffer *buffer, BIGNUM *value)
{
- u_char buf[2];
-
- if (buffer_get_ret(buffer, (char *) buf, 2) == -1)
- return (-1);
- *ret = get_u16(buf);
- return (0);
-}
+ int bits = BN_num_bits(value);
+ int bin_size = (bits + 7) / 8;
+ u_char *buf = xmalloc(bin_size);
+ int oi;
+ char msg[2];
-u_short
-buffer_get_short(Buffer *buffer)
-{
- u_short ret;
+ /* Get the value of in binary */
+ oi = BN_bn2bin(value, buf);
+ if (oi != bin_size)
+ fatal("buffer_put_bignum: BN_bn2bin() failed: oi %d != bin_size %d",
+ oi, bin_size);
- if (buffer_get_short_ret(&ret, buffer) == -1)
- fatal("buffer_get_short: buffer error");
+ /* 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, (char *)buf, oi);
- return (ret);
+ memset(buf, 0, bin_size);
+ xfree(buf);
}
+/*
+ * Retrieves an BIGNUM from the buffer.
+ */
int
-buffer_get_int_ret(u_int *ret, Buffer *buffer)
+buffer_get_bignum(Buffer *buffer, BIGNUM *value)
{
- u_char buf[4];
-
- if (buffer_get_ret(buffer, (char *) buf, 4) == -1)
- return (-1);
- *ret = get_u32(buf);
- return (0);
-}
+ int bits, bytes;
+ u_char buf[2], *bin;
-u_int
-buffer_get_int(Buffer *buffer)
-{
- u_int ret;
+ /* Get the number for bits. */
+ buffer_get(buffer, (char *) buf, 2);
+ bits = GET_16BIT(buf);
+ /* Compute the number of binary bytes that follow. */
+ bytes = (bits + 7) / 8;
+ if (buffer_len(buffer) < bytes)
+ fatal("buffer_get_bignum: input buffer too small");
+ bin = (u_char *) buffer_ptr(buffer);
+ BN_bin2bn(bin, bytes, value);
+ buffer_consume(buffer, bytes);
- if (buffer_get_int_ret(&ret, buffer) == -1)
- fatal("buffer_get_int: buffer error");
+ return 2 + bytes;
+}
- return (ret);
+/*
+ * 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_int64_ret(u_int64_t *ret, Buffer *buffer)
+buffer_get_bignum2(Buffer *buffer, BIGNUM *value)
{
- u_char buf[8];
+ /**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;
+}
- if (buffer_get_ret(buffer, (char *) buf, 8) == -1)
- return (-1);
- *ret = get_u64(buf);
- return (0);
+/*
+ * Returns an integer from the buffer (4 bytes, msb first).
+ */
+u_int
+buffer_get_int(Buffer *buffer)
+{
+ 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_int64_t ret;
-
- if (buffer_get_int64_ret(&ret, buffer) == -1)
- fatal("buffer_get_int: buffer error");
-
- return (ret);
+ u_char buf[8];
+ buffer_get(buffer, (char *) buf, 8);
+ return GET_64BIT(buf);
}
+#endif
/*
- * Stores integers in the buffer, msb first.
+ * Stores an integer in the buffer in 4 bytes, msb first.
*/
-void
-buffer_put_short(Buffer *buffer, u_short value)
-{
- char buf[2];
-
- put_u16(buf, value);
- buffer_append(buffer, buf, 2);
-}
-
void
buffer_put_int(Buffer *buffer, u_int value)
{
char buf[4];
-
- put_u32(buf, value);
+ 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_u64(buf, value);
+ PUT_64BIT(buf, value);
buffer_append(buffer, buf, 8);
}
+#endif
/*
* Returns an arbitrary binary string from the buffer. The string cannot
* 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)
+char *
+buffer_get_string(Buffer *buffer, u_int *length_ptr)
{
- u_char *value;
u_int len;
-
+ char *value;
/* Get the length. */
len = buffer_get_int(buffer);
- if (len > 256 * 1024) {
- error("buffer_get_string_ret: bad string length %u", len);
- return (NULL);
- }
+ if (len > 256 * 1024)
+ fatal("Received packet with bad string length %d", len);
/* Allocate space for the string. Add one byte for a null character. */
value = xmalloc(len + 1);
/* Get the string. */
- if (buffer_get_ret(buffer, value, len) == -1) {
- error("buffer_get_string_ret: buffer_get failed");
- xfree(value);
- return (NULL);
- }
+ buffer_get(buffer, value, len);
/* Append a null character to make processing easier. */
- value[len] = '\0';
+ value[len] = 0;
/* Optionally return the length of the string. */
if (length_ptr)
*length_ptr = len;
- return (value);
-}
-
-void *
-buffer_get_string(Buffer *buffer, u_int *length_ptr)
-{
- void *ret;
-
- if ((ret = buffer_get_string_ret(buffer, length_ptr)) == NULL)
- fatal("buffer_get_string: buffer error");
- return (ret);
-}
-
-void *
-buffer_get_string_ptr(Buffer *buffer, u_int *length_ptr)
-{
- void *ptr;
- u_int len;
-
- len = buffer_get_int(buffer);
- if (len > 256 * 1024)
- fatal("buffer_get_string_ptr: bad string length %u", len);
- ptr = buffer_ptr(buffer);
- buffer_consume(buffer, len);
- if (length_ptr)
- *length_ptr = len;
- return (ptr);
+ return value;
}
/*
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).
*/
-int
-buffer_get_char_ret(char *ret, Buffer *buffer)
-{
- if (buffer_get_ret(buffer, ret, 1) == -1) {
- error("buffer_get_char_ret: buffer_get_ret failed");
- return (-1);
- }
- return (0);
-}
-
int
buffer_get_char(Buffer *buffer)
{
char ch;
-
- if (buffer_get_char_ret(&ch, buffer) == -1)
- fatal("buffer_get_char: buffer error");
+ buffer_get(buffer, &ch, 1);
return (u_char) ch;
}
buffer_put_char(Buffer *buffer, int value)
{
char ch = value;
-
buffer_append(buffer, &ch, 1);
}
andersk / gssapi-openssh.git / blobdiff