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