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      1 /*	$NetBSD: read_message.c,v 1.2 2017/01/28 21:31:49 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 - 2001 Kungliga Tekniska Hgskolan
      5  * (Royal Institute of Technology, Stockholm, Sweden).
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * 3. Neither the name of the Institute nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include "krb5_locl.h"
     37 
     38 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
     39 krb5_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_message (context);
     53 	return ret;
     54     }
     55     if(ret < 4) {
     56 	krb5_clear_error_message(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_message(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_message (context);
     69 	return ret;
     70     }
     71     return 0;
     72 }
     73 
     74 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
     75 krb5_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 
     91 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
     92 krb5_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