Fuzz blockers

The followings are the branches where fuzzer fails to bypass.

Unique non-covered Complexity	Unique Reachable Complexities	Unique Reachable Functions	All non-covered Complexity	All Reachable Complexity	Function Name	Function Callsite	Blocked Branch
36	36	1 : View List ['stun_produce_integrity_key_str']	36	114	stun_check_message_integrity_str	call site: 00028	/src/coturn/src/client/ns_turn_msg.c:1969
8	72	7 : View List ['stun_calculate_hmac', 'stun_get_command_message_len_str', 'stun_set_command_message_len_str', 'memcmp', 'get_hmackey_size', 'strlen', 'stun_attr_get_value']	8	72	stun_check_message_integrity_by_key_str	call site: 00062	/src/coturn/src/client/ns_turn_msg.c:1906
8	72	7 : View List ['stun_calculate_hmac', 'stun_get_command_message_len_str', 'stun_set_command_message_len_str', 'memcmp', 'get_hmackey_size', 'strlen', 'stun_attr_get_value']	8	72	stun_check_message_integrity_by_key_str	call site: 00062	/src/coturn/src/client/ns_turn_msg.c:1911
8	72	7 : View List ['stun_calculate_hmac', 'stun_get_command_message_len_str', 'stun_set_command_message_len_str', 'memcmp', 'get_hmackey_size', 'strlen', 'stun_attr_get_value']	8	72	stun_check_message_integrity_by_key_str	call site: 00062	/src/coturn/src/client/ns_turn_msg.c:1916
4	4	1 : View List ['get_hmackey_size']	6	38	stun_check_message_integrity_by_key_str	call site: 00064	/src/coturn/src/client/ns_turn_msg.c:1939
2	2	1 : View List ['EVP_sha256']	4	4	stun_calculate_hmac	call site: 00068	/src/coturn/src/client/ns_turn_msg.c:121
2	2	1 : View List ['EVP_sha384']	4	4	stun_calculate_hmac	call site: 00069	/src/coturn/src/client/ns_turn_msg.c:130
2	2	1 : View List ['EVP_sha512']	4	4	stun_calculate_hmac	call site: 00070	/src/coturn/src/client/ns_turn_msg.c:139
0	0	None	2	4	stun_is_command_message_full_check_str	call site: 00023	/src/coturn/src/client/ns_turn_msg.c:491
0	0	None	2	2	stun_check_message_integrity_by_key_str	call site: 00075	/src/coturn/src/client/ns_turn_msg.c:1952
0	0	None	0	21	stun_attr_get_next_str	call site: 00015	/src/coturn/src/client/ns_turn_msg.c:1431
0	0	None	0	6	stun_is_command_message_full_check_str	call site: 00006	/src/coturn/src/client/ns_turn_msg.c:481

Fuzzer calltree


         LLVMFuzzerTestOneInput

[function] [call site] 00000


           stun_is_command_message_full_check_str

[function] [call site] 00001


             stun_is_command_message_str

[function] [call site] 00002


               ntohs

[call site] 00003


               ntohl

[call site] 00004


               ntohs

[call site] 00005


             stun_attr_get_first_by_type_str

[function] [call site] 00006


               stun_attr_get_first_str

[function] [call site] 00007


                 stun_get_command_message_len_str

[function] [call site] 00008


                   ntohs

[call site] 00009


                 stun_attr_check_valid

[function] [call site] 00010


                   stun_attr_get_len

[function] [call site] 00011


                     ntohs

[call site] 00012


               stun_attr_get_type

[function] [call site] 00013


                 ntohs

[call site] 00014


               stun_attr_get_next_str

[function] [call site] 00015


                 stun_attr_get_first_str

[function] [call site] 00016


                 stun_get_command_message_len_str

[function] [call site] 00017


                 stun_attr_get_len

[function] [call site] 00018


                 stun_attr_check_valid

[function] [call site] 00019


             stun_get_method_str

[function] [call site] 00020


               ntohs

[call site] 00021


             stun_attr_get_len

[function] [call site] 00022


             stun_attr_get_value

[function] [call site] 00023


               ntohs

[call site] 00024


             ns_crc32

[function] [call site] 00025


             ntohl

[call site] 00026


           strcpy

[call site] 00027


           stun_check_message_integrity_str

[function] [call site] 00028


             strncpy

[call site] 00029


             stun_produce_integrity_key_str

[function] [call site] 00030


               ERR_clear_error

[call site] 00031


               strlen

[call site] 00032


               strlen

[call site] 00033


               strlen

[call site] 00034


               strncpy

[call site] 00035


               strncpy

[call site] 00036


               strncpy

[call site] 00037


               EVP_MD_CTX_new

[call site] 00038


               EVP_sha256

[call site] 00039


               EVP_DigestUpdate

[call site] 00040


               EVP_DigestFinal

[call site] 00041


               EVP_MD_CTX_free

[call site] 00042


               EVP_MD_CTX_new

[call site] 00043


               EVP_sha384

[call site] 00044


               EVP_DigestUpdate

[call site] 00045


               EVP_DigestFinal

[call site] 00046


               EVP_MD_CTX_free

[call site] 00047


               EVP_MD_CTX_new

[call site] 00048


               EVP_sha512

[call site] 00049


               EVP_DigestUpdate

[call site] 00050


               EVP_DigestFinal

[call site] 00051


               EVP_MD_CTX_free

[call site] 00052


               EVP_MD_CTX_new

[call site] 00053


               FIPS_mode

[call site] 00054


               EVP_MD_CTX_set_flags

[call site] 00055


               EVP_md5

[call site] 00056


               EVP_DigestUpdate

[call site] 00057


               EVP_DigestFinal

[call site] 00058


               EVP_MD_CTX_free

[call site] 00059


             stun_check_message_integrity_by_key_str

[function] [call site] 00060


               stun_attr_get_first_by_type_str

[function] [call site] 00061


               stun_attr_get_len

[function] [call site] 00062


               stun_get_command_message_len_str

[function] [call site] 00063


               stun_set_command_message_len_str

[function] [call site] 00064


                 ntohs

[call site] 00065


               strlen

[call site] 00066


               stun_calculate_hmac

[function] [call site] 00067


                 ERR_clear_error

[call site] 00068


                 EVP_sha256

[call site] 00069


                 EVP_sha384

[call site] 00070


                 EVP_sha512

[call site] 00071


                 EVP_sha1

[call site] 00072


               get_hmackey_size

[function] [call site] 00073


               stun_set_command_message_len_str

[function] [call site] 00074


               stun_attr_get_value

[function] [call site] 00075


               memcmp

[call site] 00076