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 
33 krb5_error_code
krb5_read_message(krb5_context context,krb5_pointer fdp,krb5_data * inbuf)34 krb5_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