read_message.c revision 72445 
1246853Sdes/*
2246853Sdes * Copyright (c) 1997, 1998 Kungliga Tekniska H�gskolan
3246853Sdes * (Royal Institute of Technology, Stockholm, Sweden).
4246853Sdes * All rights reserved.
5246853Sdes *
6246853Sdes * Redistribution and use in source and binary forms, with or without
7246853Sdes * modification, are permitted provided that the following conditions
8246853Sdes * are met:
9246853Sdes *
10246853Sdes * 1. Redistributions of source code must retain the above copyright
11246853Sdes *    notice, this list of conditions and the following disclaimer.
12246853Sdes *
13246853Sdes * 2. Redistributions in binary form must reproduce the above copyright
14246853Sdes *    notice, this list of conditions and the following disclaimer in the
15246853Sdes *    documentation and/or other materials provided with the distribution.
16246853Sdes *
17246853Sdes * 3. Neither the name of the Institute nor the names of its contributors
18246853Sdes *    may be used to endorse or promote products derived from this software
19246853Sdes *    without specific prior written permission.
20246853Sdes *
21246853Sdes * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22246853Sdes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23246853Sdes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24246853Sdes * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25246853Sdes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26246854Sdes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27266114Sdes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28266114Sdes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29266114Sdes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30246853Sdes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31246853Sdes * SUCH DAMAGE.
32246853Sdes */
33246853Sdes
34246853Sdes#include "krb5_locl.h"
35246853Sdes
36246853SdesRCSID("$Id: read_message.c,v 1.7 2000/07/21 22:54:09 joda Exp $");
37246853Sdes
38246853Sdeskrb5_error_code
39246853Sdeskrb5_read_message (krb5_context context,
40246853Sdes		   krb5_pointer p_fd,
41246853Sdes		   krb5_data *data)
42246853Sdes{
43246853Sdes    krb5_error_code ret;
44246853Sdes    u_int32_t len;
45246853Sdes    u_int8_t buf[4];
46246853Sdes
47246853Sdes    ret = krb5_net_read (context, p_fd, buf, 4);
48246853Sdes    if(ret == -1)
49246853Sdes	return errno;
50246853Sdes    if(ret < 4) {
51246853Sdes	data->length = 0;
52246853Sdes	return HEIM_ERR_EOF;
53246853Sdes    }
54246853Sdes    len = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
55246853Sdes    ret = krb5_data_alloc (data, len);
56246853Sdes    if (ret)
57246853Sdes	return ret;
58246853Sdes    if (krb5_net_read (context, p_fd, data->data, len) != len) {
59246853Sdes	krb5_data_free (data);
60246853Sdes	return errno;
61246853Sdes    }
62246853Sdes    return 0;
63246853Sdes}
64246853Sdes
65246853Sdeskrb5_error_code
66246853Sdeskrb5_read_priv_message(krb5_context context,
67246853Sdes		       krb5_auth_context ac,
68246853Sdes		       krb5_pointer p_fd,
69246853Sdes		       krb5_data *data)
70246853Sdes{
71246853Sdes    krb5_error_code ret;
72246854Sdes    krb5_data packet;
73246854Sdes
74246854Sdes    ret = krb5_read_message(context, p_fd, &packet);
75246854Sdes    if(ret)
76246853Sdes	return ret;
77    ret = krb5_rd_priv (context, ac, &packet, data, NULL);
78    krb5_data_free(&packet);
79    if(ret)
80	return ret;
81    return ret;
82}
83
84krb5_error_code
85krb5_read_safe_message(krb5_context context,
86		       krb5_auth_context ac,
87		       krb5_pointer p_fd,
88		       krb5_data *data)
89{
90    krb5_error_code ret;
91    krb5_data packet;
92
93    ret = krb5_read_message(context, p_fd, &packet);
94    if(ret)
95	return ret;
96    ret = krb5_rd_safe (context, ac, &packet, data, NULL);
97    krb5_data_free(&packet);
98    if(ret)
99	return ret;
100    return ret;
101}
102