lib/krb5/read_message.c

   1 /*
   2  * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
   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
  36 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  37 krb5_read_message (krb5_context context,
  38                    krb5_pointer p_fd,
  39                    krb5_data *data)
  40 {
  41     krb5_error_code ret;
  42     uint32_t len;
  43     uint8_t buf[4];
  44
  45     krb5_data_zero(data);
  46
  47     ret = krb5_net_read (context, p_fd, buf, 4);
  48     if(ret == -1) {
  49         ret = errno;
  50         krb5_clear_error_message (context);
  51         return ret;
  52     }
  53     if(ret < 4) {
  54         krb5_clear_error_message(context);
  55         return HEIM_ERR_EOF;
  56     }
  57     len = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
  58     ret = krb5_data_alloc (data, len);
  59     if (ret) {
  60         krb5_clear_error_message(context);
  61         return ret;
  62     }
  63     if (krb5_net_read (context, p_fd, data->data, len) != len) {
  64         ret = errno;
  65         krb5_data_free (data);
  66         krb5_clear_error_message (context);
  67         return ret;
  68     }
  69     return 0;
  70 }
  71
  72 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  73 krb5_read_priv_message(krb5_context context,
  74                        krb5_auth_context ac,
  75                        krb5_pointer p_fd,
  76                        krb5_data *data)
  77 {
  78     krb5_error_code ret;
  79     krb5_data packet;
  80
  81     ret = krb5_read_message(context, p_fd, &packet);
  82     if(ret)
  83         return ret;
  84     ret = krb5_rd_priv (context, ac, &packet, data, NULL);
  85     krb5_data_free(&packet);
  86     return ret;
  87 }
  88
  89 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  90 krb5_read_safe_message(krb5_context context,
  91                        krb5_auth_context ac,
  92                        krb5_pointer p_fd,
  93                        krb5_data *data)
  94 {
  95     krb5_error_code ret;
  96     krb5_data packet;
  97
  98     ret = krb5_read_message(context, p_fd, &packet);
  99     if(ret)
 100         return ret;
 101     ret = krb5_rd_safe (context, ac, &packet, data, NULL);
 102     krb5_data_free(&packet);
 103     return ret;
 104 }