diff --git a/src/consts.jl b/src/consts.jl
index fba0f8d..9f4929e 100644
--- a/src/consts.jl
+++ b/src/consts.jl
@@ -37,3 +37,113 @@ end
     TLS1_2_VERSION
     TLS1_3_VERSION
 end
+
+@enum SSL_CTRL begin
+    SSL_CERT_SET_FIRST = 1
+    SSL_CERT_SET_NEXT = 2
+    SSL_CERT_SET_SERVER = 3
+    # SSL_CTRL_SET_TMP_DH = 3
+    SSL_CTRL_SET_TMP_ECDH = 4
+    SSL_CTRL_SET_TMP_DH_CB = 6
+    SSL_CTRL_GET_CLIENT_CERT_REQUEST = 9
+    SSL_CTRL_GET_NUM_RENEGOTIATIONS = 10
+    SSL_CTRL_CLEAR_NUM_RENEGOTIATIONS = 11
+    SSL_CTRL_GET_TOTAL_RENEGOTIATIONS = 12
+    SSL_CTRL_GET_FLAGS = 13
+    SSL_CTRL_EXTRA_CHAIN_CERT = 14
+    SSL_CTRL_SET_MSG_CALLBACK = 15
+    SSL_CTRL_SET_MSG_CALLBACK_ARG = 16
+    SSL_CTRL_SET_MTU = 17
+    SSL_CTRL_SESS_NUMBER = 20
+    SSL_CTRL_SESS_CONNECT = 21
+    SSL_CTRL_SESS_CONNECT_GOOD = 22
+    SSL_CTRL_SESS_CONNECT_RENEGOTIATE = 23
+    SSL_CTRL_SESS_ACCEPT = 24
+    SSL_CTRL_SESS_ACCEPT_GOOD = 25
+    SSL_CTRL_SESS_ACCEPT_RENEGOTIATE = 26
+    SSL_CTRL_SESS_HIT = 27
+    SSL_CTRL_SESS_CB_HIT = 28
+    SSL_CTRL_SESS_MISSES = 29
+    SSL_CTRL_SESS_TIMEOUTS = 30
+    SSL_CTRL_SESS_CACHE_FULL = 31
+    SSL_CTRL_MODE = 33
+    SSL_CTRL_GET_READ_AHEAD = 40
+    SSL_CTRL_SET_READ_AHEAD = 41
+    SSL_CTRL_SET_SESS_CACHE_SIZE = 42
+    SSL_CTRL_GET_SESS_CACHE_SIZE = 43
+    SSL_CTRL_SET_SESS_CACHE_MODE = 44
+    SSL_CTRL_GET_SESS_CACHE_MODE = 45
+    SSL_CTRL_GET_MAX_CERT_LIST = 50
+    SSL_CTRL_SET_MAX_CERT_LIST = 51
+    SSL_CTRL_SET_MAX_SEND_FRAGMENT = 52
+    SSL_CTRL_SET_TLSEXT_SERVERNAME_CB = 53
+    SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG = 54
+    SSL_CTRL_SET_TLSEXT_HOSTNAME = 55
+    SSL_CTRL_SET_TLSEXT_DEBUG_CB = 56
+    SSL_CTRL_SET_TLSEXT_DEBUG_ARG = 57
+    SSL_CTRL_GET_TLSEXT_TICKET_KEYS = 58
+    SSL_CTRL_SET_TLSEXT_TICKET_KEYS = 59
+    SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB = 63
+    SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB_ARG = 64
+    SSL_CTRL_SET_TLSEXT_STATUS_REQ_TYPE = 65
+    SSL_CTRL_GET_TLSEXT_STATUS_REQ_EXTS = 66
+    SSL_CTRL_SET_TLSEXT_STATUS_REQ_EXTS = 67
+    SSL_CTRL_GET_TLSEXT_STATUS_REQ_IDS = 68
+    SSL_CTRL_SET_TLSEXT_STATUS_REQ_IDS = 69
+    SSL_CTRL_GET_TLSEXT_STATUS_REQ_OCSP_RESP = 70
+    SSL_CTRL_SET_TLSEXT_STATUS_REQ_OCSP_RESP = 71
+    SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB = 75
+    SSL_CTRL_SET_SRP_VERIFY_PARAM_CB = 76
+    SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB = 77
+    SSL_CTRL_SET_SRP_ARG = 78
+    SSL_CTRL_SET_TLS_EXT_SRP_USERNAME = 79
+    SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH = 80
+    SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD = 81
+    DTLS_CTRL_GET_TIMEOUT = 73
+    DTLS_CTRL_HANDLE_TIMEOUT = 74
+    # SSL_CTRL_GET_RI_SUPPORT = 76
+    # SSL_CTRL_CLEAR_MODE = 78
+    # SSL_CTRL_SET_NOT_RESUMABLE_SESS_CB = 79
+    SSL_CTRL_GET_EXTRA_CHAIN_CERTS = 82
+    SSL_CTRL_CLEAR_EXTRA_CHAIN_CERTS = 83
+    SSL_CTRL_CHAIN = 88
+    SSL_CTRL_CHAIN_CERT = 89
+    SSL_CTRL_GET_GROUPS = 90
+    SSL_CTRL_SET_GROUPS = 91
+    SSL_CTRL_SET_GROUPS_LIST = 92
+    SSL_CTRL_GET_SHARED_GROUP = 93
+    SSL_CTRL_SET_SIGALGS = 97
+    SSL_CTRL_SET_SIGALGS_LIST = 98
+    SSL_CTRL_CERT_FLAGS = 99
+    SSL_CTRL_CLEAR_CERT_FLAGS = 100
+    SSL_CTRL_SET_CLIENT_SIGALGS = 101
+    SSL_CTRL_SET_CLIENT_SIGALGS_LIST = 102
+    SSL_CTRL_GET_CLIENT_CERT_TYPES = 103
+    SSL_CTRL_SET_CLIENT_CERT_TYPES = 104
+    SSL_CTRL_BUILD_CERT_CHAIN = 105
+    SSL_CTRL_SET_VERIFY_CERT_STORE = 106
+    SSL_CTRL_SET_CHAIN_CERT_STORE = 107
+    SSL_CTRL_GET_PEER_SIGNATURE_NID = 108
+    SSL_CTRL_GET_PEER_TMP_KEY = 109
+    SSL_CTRL_GET_RAW_CIPHERLIST = 110
+    SSL_CTRL_GET_EC_POINT_FORMATS = 111
+    SSL_CTRL_GET_CHAIN_CERTS = 115
+    SSL_CTRL_SELECT_CURRENT_CERT = 116
+    SSL_CTRL_SET_CURRENT_CERT = 117
+    SSL_CTRL_SET_DH_AUTO = 118
+    DTLS_CTRL_SET_LINK_MTU = 120
+    DTLS_CTRL_GET_LINK_MIN_MTU = 121
+    SSL_CTRL_GET_EXTMS_SUPPORT = 122
+    SSL_CTRL_SET_MIN_PROTO_VERSION = 123
+    SSL_CTRL_SET_MAX_PROTO_VERSION = 124
+    SSL_CTRL_SET_SPLIT_SEND_FRAGMENT = 125
+    SSL_CTRL_SET_MAX_PIPELINES = 126
+    SSL_CTRL_GET_TLSEXT_STATUS_REQ_TYPE = 127
+    SSL_CTRL_GET_TLSEXT_STATUS_REQ_CB = 128
+    SSL_CTRL_GET_TLSEXT_STATUS_REQ_CB_ARG = 129
+    SSL_CTRL_GET_MIN_PROTO_VERSION = 130
+    SSL_CTRL_GET_MAX_PROTO_VERSION = 131
+    SSL_CTRL_GET_SIGNATURE_NID = 132
+    SSL_CTRL_GET_TMP_KEY = 133
+    SSL_CTRL_GET_NEGOTIATED_GROUP = 134
+end