+/* $OpenBSD: bufaux.c,v 1.47 2010/01/12 01:36:08 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
*/
#include "includes.h"
-RCSID("$OpenBSD: bufaux.c,v 1.32 2004/02/23 15:12:46 markus Exp $");
+
+#include <sys/types.h>
#include <openssl/bn.h>
-#include "bufaux.h"
+
+#include <string.h>
+#include <stdarg.h>
+
#include "xmalloc.h"
-#include "getput.h"
+#include "buffer.h"
#include "log.h"
+#include "misc.h"
/*
- * 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.
+ * Returns integers from the buffer (msb first).
*/
-void
-buffer_put_bignum(Buffer *buffer, const BIGNUM *value)
-{
- int bits = BN_num_bits(value);
- int bin_size = (bits + 7) / 8;
- u_char *buf = xmalloc(bin_size);
- int oi;
- char msg[2];
-
- /* 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);
-
- /* 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);
-
- memset(buf, 0, bin_size);
- xfree(buf);
-}
-/*
- * Retrieves an BIGNUM from the buffer.
- */
-void
-buffer_get_bignum(Buffer *buffer, BIGNUM *value)
+int
+buffer_get_short_ret(u_short *ret, Buffer *buffer)
{
- u_int bits, bytes;
- u_char buf[2], *bin;
-
- /* 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 (bytes > 8 * 1024)
- fatal("buffer_get_bignum: cannot handle BN of size %d", bytes);
- if (buffer_len(buffer) < bytes)
- fatal("buffer_get_bignum: input buffer too small");
- bin = buffer_ptr(buffer);
- BN_bin2bn(bin, bytes, value);
- buffer_consume(buffer, bytes);
-}
+ u_char buf[2];
-/*
- * Stores an BIGNUM in the buffer in SSH2 format.
- */
-void
-buffer_put_bignum2(Buffer *buffer, const BIGNUM *value)
-{
- u_int bytes;
- u_char *buf;
- int oi;
- u_int hasnohigh = 0;
-
- if (BN_is_zero(value)) {
- buffer_put_int(buffer, 0);
- return;
- }
- if (value->neg)
- fatal("buffer_put_bignum2: negative numbers not supported");
- bytes = BN_num_bytes(value) + 1; /* extra padding byte */
- if (bytes < 2)
- fatal("buffer_put_bignum2: BN too small");
- buf = xmalloc(bytes);
- buf[0] = '\0';
- /* Get the value of in binary */
- oi = BN_bn2bin(value, buf+1);
- if (oi != bytes-1)
- fatal("buffer_put_bignum2: BN_bn2bin() failed: "
- "oi %d != bin_size %d", oi, bytes);
- hasnohigh = (buf[1] & 0x80) ? 0 : 1;
- buffer_put_string(buffer, buf+hasnohigh, bytes-hasnohigh);
- memset(buf, 0, bytes);
- xfree(buf);
+ if (buffer_get_ret(buffer, (char *) buf, 2) == -1)
+ return (-1);
+ *ret = get_u16(buf);
+ return (0);
}
-void
-buffer_get_bignum2(Buffer *buffer, BIGNUM *value)
+u_short
+buffer_get_short(Buffer *buffer)
{
- u_int len;
- u_char *bin = buffer_get_string(buffer, &len);
-
- if (len > 0 && (bin[0] & 0x80))
- fatal("buffer_get_bignum2: negative numbers not supported");
- if (len > 8 * 1024)
- fatal("buffer_get_bignum2: cannot handle BN of size %d", len);
- BN_bin2bn(bin, len, value);
- xfree(bin);
-}
+ u_short ret;
-/*
- * Returns integers from the buffer (msb first).
- */
+ if (buffer_get_short_ret(&ret, buffer) == -1)
+ fatal("buffer_get_short: buffer error");
-u_short
-buffer_get_short(Buffer *buffer)
+ return (ret);
+}
+
+int
+buffer_get_int_ret(u_int *ret, Buffer *buffer)
{
- u_char buf[2];
+ u_char buf[4];
- buffer_get(buffer, (char *) buf, 2);
- return GET_16BIT(buf);
+ if (buffer_get_ret(buffer, (char *) buf, 4) == -1)
+ return (-1);
+ *ret = get_u32(buf);
+ return (0);
}
u_int
buffer_get_int(Buffer *buffer)
{
- u_char buf[4];
+ u_int ret;
- buffer_get(buffer, (char *) buf, 4);
- return GET_32BIT(buf);
+ if (buffer_get_int_ret(&ret, buffer) == -1)
+ fatal("buffer_get_int: buffer error");
+
+ return (ret);
+}
+
+int
+buffer_get_int64_ret(u_int64_t *ret, Buffer *buffer)
+{
+ u_char buf[8];
+
+ if (buffer_get_ret(buffer, (char *) buf, 8) == -1)
+ return (-1);
+ *ret = get_u64(buf);
+ return (0);
}
u_int64_t
buffer_get_int64(Buffer *buffer)
{
- u_char buf[8];
+ u_int64_t ret;
+
+ if (buffer_get_int64_ret(&ret, buffer) == -1)
+ fatal("buffer_get_int: buffer error");
- buffer_get(buffer, (char *) buf, 8);
- return GET_64BIT(buf);
+ return (ret);
}
/*
{
char buf[2];
- PUT_16BIT(buf, value);
+ put_u16(buf, value);
buffer_append(buffer, buf, 2);
}
{
char buf[4];
- PUT_32BIT(buf, value);
+ put_u32(buf, value);
buffer_append(buffer, buf, 4);
}
{
char buf[8];
- PUT_64BIT(buf, value);
+ put_u64(buf, value);
buffer_append(buffer, buf, 8);
}
* to the returned string, and is not counted in length.
*/
void *
-buffer_get_string(Buffer *buffer, u_int *length_ptr)
+buffer_get_string_ret(Buffer *buffer, u_int *length_ptr)
{
u_char *value;
u_int len;
/* Get the length. */
len = buffer_get_int(buffer);
- if (len > 256 * 1024)
- fatal("buffer_get_string: bad string length %u", len);
+ if (len > 256 * 1024) {
+ error("buffer_get_string_ret: bad string length %u", len);
+ return (NULL);
+ }
/* Allocate space for the string. Add one byte for a null character. */
value = xmalloc(len + 1);
/* Get the string. */
- buffer_get(buffer, value, len);
+ if (buffer_get_ret(buffer, value, len) == -1) {
+ error("buffer_get_string_ret: buffer_get failed");
+ xfree(value);
+ return (NULL);
+ }
/* 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;
+ 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_ret(Buffer *buffer, u_int *length_ptr)
+{
+ void *ptr;
+ u_int len;
+
+ if (buffer_get_int_ret(&len, buffer) != 0)
+ return NULL;
+ if (len > 256 * 1024) {
+ error("buffer_get_string_ptr: bad string length %u", len);
+ return NULL;
+ }
+ ptr = buffer_ptr(buffer);
+ buffer_consume(buffer, len);
+ if (length_ptr)
+ *length_ptr = len;
+ return (ptr);
+}
+
+void *
+buffer_get_string_ptr(Buffer *buffer, u_int *length_ptr)
+{
+ void *ret;
+
+ if ((ret = buffer_get_string_ptr_ret(buffer, length_ptr)) == NULL)
+ fatal("buffer_get_string_ptr: buffer error");
+ return (ret);
}
/*
/*
* 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;
- buffer_get(buffer, &ch, 1);
+ if (buffer_get_char_ret(&ch, buffer) == -1)
+ fatal("buffer_get_char: buffer error");
return (u_char) ch;
}
andersk / openssh.git / blobdiff