1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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 #include "k5-int.h"
28 #include <errno.h>
29
30 krb5_error_code
krb5_read_message(krb5_context context,krb5_pointer fdp,krb5_data * inbuf)31 krb5_read_message(krb5_context context, krb5_pointer fdp, krb5_data *inbuf)
32 {
33 krb5_int32 len;
34 int len2, ilen;
35 char *buf = NULL;
36 int fd = *( (int *) fdp);
37
38 *inbuf = empty_data();
39
40 if ((len2 = krb5_net_read(context, fd, (char *)&len, 4)) != 4)
41 return((len2 < 0) ? errno : ECONNABORTED);
42 len = ntohl(len);
43
44 if ((len & VALID_UINT_BITS) != (krb5_ui_4) len) /* Overflow size_t??? */
45 return ENOMEM;
46
47 ilen = (int)len;
48 if (ilen) {
49 /*
50 * We may want to include a sanity check here someday....
51 */
52 if (!(buf = malloc(ilen))) {
53 return(ENOMEM);
54 }
55 if ((len2 = krb5_net_read(context, fd, buf, ilen)) != ilen) {
56 free(buf);
57 return((len2 < 0) ? errno : ECONNABORTED);
58 }
59 }
60 *inbuf = make_data(buf, ilen);
61 return(0);
62 }
63