LCOV - code coverage report
Current view: top level - tls/extensions - s2n_server_alpn.c (source / functions) Hit Total Coverage
Test: unit_test_coverage.info Lines: 26 26 100.0 %
Date: 2025-08-14 07:26:07 Functions: 3 3 100.0 %
Branches: 16 36 44.4 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
       3                 :            :  *
       4                 :            :  * Licensed under the Apache License, Version 2.0 (the "License").
       5                 :            :  * You may not use this file except in compliance with the License.
       6                 :            :  * A copy of the License is located at
       7                 :            :  *
       8                 :            :  *  http://aws.amazon.com/apache2.0
       9                 :            :  *
      10                 :            :  * or in the "license" file accompanying this file. This file is distributed
      11                 :            :  * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
      12                 :            :  * express or implied. See the License for the specific language governing
      13                 :            :  * permissions and limitations under the License.
      14                 :            :  */
      15                 :            : 
      16                 :            : #include "tls/extensions/s2n_server_alpn.h"
      17                 :            : 
      18                 :            : #include "stuffer/s2n_stuffer.h"
      19                 :            : #include "tls/s2n_connection.h"
      20                 :            : #include "tls/s2n_tls.h"
      21                 :            : #include "utils/s2n_safety.h"
      22                 :            : 
      23                 :            : bool s2n_server_alpn_should_send(struct s2n_connection *conn);
      24                 :            : static int s2n_alpn_send(struct s2n_connection *conn, struct s2n_stuffer *out);
      25                 :            : static int s2n_alpn_recv(struct s2n_connection *conn, struct s2n_stuffer *extension);
      26                 :            : 
      27                 :            : const s2n_extension_type s2n_server_alpn_extension = {
      28                 :            :     .iana_value = TLS_EXTENSION_ALPN,
      29                 :            :     .is_response = true,
      30                 :            :     .send = s2n_alpn_send,
      31                 :            :     .recv = s2n_alpn_recv,
      32                 :            :     .should_send = s2n_server_alpn_should_send,
      33                 :            :     .if_missing = s2n_extension_noop_if_missing,
      34                 :            : };
      35                 :            : 
      36                 :            : bool s2n_server_alpn_should_send(struct s2n_connection *conn)
      37                 :         58 : {
      38 [ +  - ][ +  + ]:         58 :     return conn && strlen(conn->application_protocol) > 0;
      39                 :         58 : }
      40                 :            : 
      41                 :            : static int s2n_alpn_send(struct s2n_connection *conn, struct s2n_stuffer *out)
      42                 :         36 : {
      43 [ -  + ][ #  # ]:         36 :     POSIX_ENSURE_REF(conn);
      44                 :         36 :     const uint8_t application_protocol_len = strlen(conn->application_protocol);
      45                 :            : 
      46                 :            :     /* Size of protocol name list */
      47         [ -  + ]:         36 :     POSIX_GUARD(s2n_stuffer_write_uint16(out, application_protocol_len + sizeof(uint8_t)));
      48                 :            : 
      49                 :            :     /* Single entry in protocol name list */
      50         [ -  + ]:         36 :     POSIX_GUARD(s2n_stuffer_write_uint8(out, application_protocol_len));
      51         [ -  + ]:         36 :     POSIX_GUARD(s2n_stuffer_write_bytes(out, (uint8_t *) conn->application_protocol, application_protocol_len));
      52                 :            : 
      53                 :         36 :     return S2N_SUCCESS;
      54                 :         36 : }
      55                 :            : 
      56                 :            : static int s2n_alpn_recv(struct s2n_connection *conn, struct s2n_stuffer *extension)
      57                 :         11 : {
      58 [ -  + ][ #  # ]:         11 :     POSIX_ENSURE_REF(conn);
      59                 :            : 
      60                 :         11 :     uint16_t size_of_all = 0;
      61         [ -  + ]:         11 :     POSIX_GUARD(s2n_stuffer_read_uint16(extension, &size_of_all));
      62 [ +  + ][ -  + ]:         11 :     if (size_of_all > s2n_stuffer_data_available(extension) || size_of_all < 3) {
      63                 :            :         /* ignore invalid extension size */
      64                 :          1 :         return S2N_SUCCESS;
      65                 :          1 :     }
      66                 :            : 
      67                 :         10 :     uint8_t protocol_len = 0;
      68         [ -  + ]:         10 :     POSIX_GUARD(s2n_stuffer_read_uint8(extension, &protocol_len));
      69                 :            : 
      70                 :         10 :     uint8_t *protocol = s2n_stuffer_raw_read(extension, protocol_len);
      71 [ #  # ][ -  + ]:         10 :     POSIX_ENSURE_REF(protocol);
      72                 :            : 
      73                 :            :     /* copy the first protocol name */
      74 [ -  + ][ #  # ]:         10 :     POSIX_CHECKED_MEMCPY(conn->application_protocol, protocol, protocol_len);
                 [ +  - ]
      75                 :         10 :     conn->application_protocol[protocol_len] = '\0';
      76                 :            : 
      77                 :         10 :     return S2N_SUCCESS;
      78                 :         10 : }

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