1 /***************************************************************************
2  * Copyright (c) 2024 Microsoft Corporation
3  *
4  * This program and the accompanying materials are made available under the
5  * terms of the MIT License which is available at
6  * https://opensource.org/licenses/MIT.
7  *
8  * SPDX-License-Identifier: MIT
9  **************************************************************************/
10 
11 
12 /**************************************************************************/
13 /**************************************************************************/
14 /**                                                                       */
15 /** NetX Secure Component                                                 */
16 /**                                                                       */
17 /**    Transport Layer Security (TLS)                                     */
18 /**                                                                       */
19 /**************************************************************************/
20 /**************************************************************************/
21 
22 #define NX_SECURE_SOURCE_CODE
23 
24 
25 /* Include necessary system files.  */
26 
27 #include "nx_secure_tls.h"
28 
29 /**************************************************************************/
30 /*                                                                        */
31 /*  FUNCTION                                               RELEASE        */
32 /*                                                                        */
33 /*    _nx_secure_tls_session_packet_buffer_set            PORTABLE C      */
34 /*                                                           6.1          */
35 /*  AUTHOR                                                                */
36 /*                                                                        */
37 /*    Timothy Stapko, Microsoft Corporation                               */
38 /*                                                                        */
39 /*  DESCRIPTION                                                           */
40 /*                                                                        */
41 /*    This function sets the buffer TLS uses to reassemble incoming       */
42 /*    messages which may span multiple TCP packets.                       */
43 /*                                                                        */
44 /*  INPUT                                                                 */
45 /*                                                                        */
46 /*    session_ptr                           TLS control block             */
47 /*    buffer_ptr                            Pointer to buffer             */
48 /*    buffer_size                           Buffer area size              */
49 /*                                                                        */
50 /*  OUTPUT                                                                */
51 /*                                                                        */
52 /*    status                                Completion status             */
53 /*                                                                        */
54 /*  CALLS                                                                 */
55 /*                                                                        */
56 /*    None                                                                */
57 /*                                                                        */
58 /*  CALLED BY                                                             */
59 /*                                                                        */
60 /*    Application Code                                                    */
61 /*                                                                        */
62 /*  RELEASE HISTORY                                                       */
63 /*                                                                        */
64 /*    DATE              NAME                      DESCRIPTION             */
65 /*                                                                        */
66 /*  05-19-2020     Timothy Stapko           Initial Version 6.0           */
67 /*  09-30-2020     Timothy Stapko           Modified comment(s),          */
68 /*                                            resulting in version 6.1    */
69 /*                                                                        */
70 /**************************************************************************/
_nx_secure_tls_session_packet_buffer_set(NX_SECURE_TLS_SESSION * session_ptr,UCHAR * buffer_ptr,ULONG buffer_size)71 UINT  _nx_secure_tls_session_packet_buffer_set(NX_SECURE_TLS_SESSION *session_ptr,
72                                                UCHAR *buffer_ptr, ULONG buffer_size)
73 {
74 
75     /* For machines that don't auto-align, check and adjust for four byte alignment. */
76     if (((ULONG)buffer_ptr) & 0x3)
77     {
78         buffer_ptr = (UCHAR *)(((((ULONG)buffer_ptr) & 0xFFFFFFFC) + 4) & 0xFFFFFFFF);
79         buffer_size -= (((ULONG)buffer_ptr) & 0x3);
80     }
81 
82     /* Check size of buffer for alignment after above adjustment. */
83     if (buffer_size & 0x3)
84     {
85         buffer_size = buffer_size & 0xFFFFFFFC;
86     }
87 
88 
89     /* Set the buffer and its size. */
90     session_ptr -> nx_secure_tls_packet_buffer = buffer_ptr;
91     session_ptr -> nx_secure_tls_packet_buffer_size = buffer_size;
92 
93     /* Save off the original size of the buffer. */
94     session_ptr -> nx_secure_tls_packet_buffer_original_size = buffer_size;
95 
96     return(NX_SUCCESS);
97 }
98 
99