crypto/dist/heimdal/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 __RCSID("$Heimdal: read_message.c 21750 2007-07-31 20:41:25Z lha $"
  37         "$NetBSD$");
  38
  39 krb5_error_code KRB5_LIB_FUNCTION
  40 krb5_read_message (krb5_context context,
  41                    krb5_pointer p_fd,
  42                    krb5_data *data)
  43 {
  44     krb5_error_code ret;
  45     uint32_t len;
  46     uint8_t buf[4];
  47
  48     krb5_data_zero(data);
  49
  50     ret = krb5_net_read (context, p_fd, buf, 4);
  51     if(ret == -1) {
  52         ret = errno;
  53         krb5_clear_error_string (context);
  54         return ret;
  55     }
  56     if(ret < 4) {
  57         krb5_clear_error_string(context);
  58         return HEIM_ERR_EOF;
  59     }
  60     len = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
  61     ret = krb5_data_alloc (data, len);
  62     if (ret) {
  63         krb5_clear_error_string(context);
  64         return ret;
  65     }
  66     if (krb5_net_read (context, p_fd, data->data, len) != len) {
  67         ret = errno;
  68         krb5_data_free (data);
  69         krb5_clear_error_string (context);
  70         return ret;
  71     }
  72     return 0;
  73 }
  74
  75 krb5_error_code KRB5_LIB_FUNCTION
  76 krb5_read_priv_message(krb5_context context,
  77                        krb5_auth_context ac,
  78                        krb5_pointer p_fd,
  79                        krb5_data *data)
  80 {
  81     krb5_error_code ret;
  82     krb5_data packet;
  83
  84     ret = krb5_read_message(context, p_fd, &packet);
  85     if(ret)
  86         return ret;
  87     ret = krb5_rd_priv (context, ac, &packet, data, NULL);
  88     krb5_data_free(&packet);
  89     return ret;
  90 }
  91
  92 krb5_error_code KRB5_LIB_FUNCTION
  93 krb5_read_safe_message(krb5_context context,
  94                        krb5_auth_context ac,
  95                        krb5_pointer p_fd,
  96                        krb5_data *data)
  97 {
  98     krb5_error_code ret;
  99     krb5_data packet;
 100
 101     ret = krb5_read_message(context, p_fd, &packet);
 102     if(ret)
 103         return ret;
 104     ret = krb5_rd_safe (context, ac, &packet, data, NULL);
 105     krb5_data_free(&packet);
 106     return ret;
 107 }