1/*
2 * lib/krb5/os/read_msg.c
3 *
4 * Copyright 1991 by the Massachusetts Institute of Technology.
5 * All Rights Reserved.
6 *
7 * Export of this software from the United States of America may
8 *   require a specific license from the United States Government.
9 *   It is the responsibility of any person or organization contemplating
10 *   export to obtain such a license before exporting.
11 *
12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
13 * distribute this software and its documentation for any purpose and
14 * without fee is hereby granted, provided that the above copyright
15 * notice appear in all copies and that both that copyright notice and
16 * this permission notice appear in supporting documentation, and that
17 * the name of M.I.T. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission.  Furthermore if you modify this software you must label
20 * your software as modified software and not distribute it in such a
21 * fashion that it might be confused with the original M.I.T. software.
22 * M.I.T. makes no representations about the suitability of
23 * this software for any purpose.  It is provided "as is" without express
24 * or implied warranty.
25 *
26 *
27 * Write a message to the network
28 */
29
30#include "k5-int.h"
31#include <errno.h>
32
33krb5_error_code
34krb5_read_message(krb5_context context, krb5_pointer fdp, krb5_data *inbuf)
35{
36	krb5_int32	len;
37	int		len2, ilen;
38	char		*buf = NULL;
39	int		fd = *( (int *) fdp);
40
41	if ((len2 = krb5_net_read(context, fd, (char *)&len, 4)) != 4)
42		return((len2 < 0) ? errno : ECONNABORTED);
43	len = ntohl(len);
44
45	if ((len & VALID_UINT_BITS) != len)  /* Overflow size_t??? */
46		return ENOMEM;
47
48	inbuf->length = ilen = (int) len;
49	if (ilen) {
50		/*
51		 * We may want to include a sanity check here someday....
52		 */
53		if (!(buf = malloc(inbuf->length))) {
54			return(ENOMEM);
55		}
56		if ((len2 = krb5_net_read(context, fd, buf, ilen)) != ilen) {
57			krb5_xfree(buf);
58			return((len2 < 0) ? errno : ECONNABORTED);
59		}
60	}
61	inbuf->data = buf;
62	return(0);
63}
64