read_message.c revision 178826 
1/*
2 * Copyright (c) 1997 - 2001 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "krb5_locl.h"
35
36RCSID("$Id: read_message.c 21750 2007-07-31 20:41:25Z lha $");
37
38krb5_error_code KRB5_LIB_FUNCTION
39krb5_read_message (krb5_context context,
40		   krb5_pointer p_fd,
41		   krb5_data *data)
42{
43    krb5_error_code ret;
44    uint32_t len;
45    uint8_t buf[4];
46
47    krb5_data_zero(data);
48
49    ret = krb5_net_read (context, p_fd, buf, 4);
50    if(ret == -1) {
51	ret = errno;
52	krb5_clear_error_string (context);
53	return ret;
54    }
55    if(ret < 4) {
56	krb5_clear_error_string(context);
57	return HEIM_ERR_EOF;
58    }
59    len = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
60    ret = krb5_data_alloc (data, len);
61    if (ret) {
62	krb5_clear_error_string(context);
63	return ret;
64    }
65    if (krb5_net_read (context, p_fd, data->data, len) != len) {
66	ret = errno;
67	krb5_data_free (data);
68	krb5_clear_error_string (context);
69	return ret;
70    }
71    return 0;
72}
73
74krb5_error_code KRB5_LIB_FUNCTION
75krb5_read_priv_message(krb5_context context,
76		       krb5_auth_context ac,
77		       krb5_pointer p_fd,
78		       krb5_data *data)
79{
80    krb5_error_code ret;
81    krb5_data packet;
82
83    ret = krb5_read_message(context, p_fd, &packet);
84    if(ret)
85	return ret;
86    ret = krb5_rd_priv (context, ac, &packet, data, NULL);
87    krb5_data_free(&packet);
88    return ret;
89}
90
91krb5_error_code KRB5_LIB_FUNCTION
92krb5_read_safe_message(krb5_context context,
93		       krb5_auth_context ac,
94		       krb5_pointer p_fd,
95		       krb5_data *data)
96{
97    krb5_error_code ret;
98    krb5_data packet;
99
100    ret = krb5_read_message(context, p_fd, &packet);
101    if(ret)
102	return ret;
103    ret = krb5_rd_safe (context, ac, &packet, data, NULL);
104    krb5_data_free(&packet);
105    return ret;
106}
107