1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
use super::super::*;
use libc::*;

pub enum SSL_METHOD {}
pub enum SSL_CIPHER {}
cfg_if! {
    if #[cfg(any(ossl110, libressl280))] {
        pub enum SSL_SESSION {}
    } else if #[cfg(libressl251)] {
        #[repr(C)]
        pub struct SSL_SESSION {
            ssl_version: c_int,
            pub master_key_length: c_int,
            pub master_key: [c_uchar; 48],
            session_id_length: c_uint,
            session_id: [c_uchar; SSL_MAX_SSL_SESSION_ID_LENGTH as usize],
            sid_ctx_length: c_uint,
            sid_ctx: [c_uchar; SSL_MAX_SID_CTX_LENGTH as usize],
            peer: *mut X509,
            verify_result: c_long,
            timeout: c_long,
            time: time_t,
            pub references: c_int,
            cipher: *const SSL_CIPHER,
            cipher_id: c_long,
            ciphers: *mut stack_st_SSL_CIPHER,
            tlsext_hostname: *mut c_char,
            tlsext_tick: *mut c_uchar,
            tlsext_ticklen: size_t,
            tlsext_tick_lifetime_int: c_long,
            internal: *mut c_void,
        }
    } else if #[cfg(libressl)] {
        #[repr(C)]
        pub struct SSL_SESSION {
            ssl_version: c_int,
            pub master_key_length: c_int,
            pub master_key: [c_uchar; 48],
            session_id_length: c_uint,
            session_id: [c_uchar; SSL_MAX_SSL_SESSION_ID_LENGTH as usize],
            sid_ctx_length: c_uint,
            sid_ctx: [c_uchar; SSL_MAX_SID_CTX_LENGTH as usize],
            not_resumable: c_int,
            sess_cert: *mut c_void,
            peer: *mut X509,
            verify_result: c_long,
            timeout: c_long,
            time: time_t,
            pub references: c_int,
            cipher: *const c_void,
            cipher_id: c_ulong,
            ciphers: *mut c_void,
            ex_data: CRYPTO_EX_DATA,
            prev: *mut c_void,
            next: *mut c_void,
            tlsext_hostname: *mut c_char,
            tlsext_ecpointformatlist_length: size_t,
            tlsext_ecpointformatlist: *mut u8,
            tlsext_ellipticcurvelist_length: size_t,
            tlsext_ellipticcurvelist: *mut u16,
            tlsext_tick: *mut c_uchar,
            tlsext_ticklen: size_t,
            tlsext_tick_lifetime_hint: c_long,
        }
    } else {
        #[repr(C)]
        pub struct SSL_SESSION {
            ssl_version: c_int,
            key_arg_length: c_uint,
            key_arg: [c_uchar; SSL_MAX_KEY_ARG_LENGTH as usize],
            pub master_key_length: c_int,
            pub master_key: [c_uchar; 48],
            session_id_length: c_uint,
            session_id: [c_uchar; SSL_MAX_SSL_SESSION_ID_LENGTH as usize],
            sid_ctx_length: c_uint,
            sid_ctx: [c_uchar; SSL_MAX_SID_CTX_LENGTH as usize],
            #[cfg(not(osslconf = "OPENSSL_NO_KRB5"))]
            krb5_client_princ_len: c_uint,
            #[cfg(not(osslconf = "OPENSSL_NO_KRB5"))]
            krb5_client_princ: [c_uchar; SSL_MAX_KRB5_PRINCIPAL_LENGTH as usize],
            #[cfg(not(osslconf = "OPENSSL_NO_PSK"))]
            psk_identity_hint: *mut c_char,
            #[cfg(not(osslconf = "OPENSSL_NO_PSK"))]
            psk_identity: *mut c_char,
            not_resumable: c_int,
            sess_cert: *mut c_void,
            peer: *mut X509,
            verify_result: c_long,
            pub references: c_int,
            timeout: c_long,
            time: c_long,
            compress_meth: c_uint,
            cipher: *const c_void,
            cipher_id: c_ulong,
            ciphers: *mut c_void,
            ex_data: CRYPTO_EX_DATA,
            prev: *mut c_void,
            next: *mut c_void,
            #[cfg(not(osslconf = "OPENSSL_NO_TLSEXT"))]
            tlsext_hostname: *mut c_char,
            #[cfg(all(
                not(osslconf = "OPENSSL_NO_TLSEXT"),
                not(osslconf = "OPENSSL_NO_EC")
            ))]
            tlsext_ecpointformatlist_length: size_t,
            #[cfg(all(
                not(osslconf = "OPENSSL_NO_TLSEXT"),
                not(osslconf = "OPENSSL_NO_EC")
            ))]
            tlsext_ecpointformatlist: *mut c_uchar,
            #[cfg(all(
                not(osslconf = "OPENSSL_NO_TLSEXT"),
                not(osslconf = "OPENSSL_NO_EC")
            ))]
            tlsext_ellipticcurvelist_length: size_t,
            #[cfg(all(
                not(osslconf = "OPENSSL_NO_TLSEXT"),
                not(osslconf = "OPENSSL_NO_EC")
            ))]
            tlsext_ellipticcurvelist: *mut c_uchar,
            #[cfg(not(osslconf = "OPENSSL_NO_TLSEXT"))]
            tlsext_tick: *mut c_uchar,
            #[cfg(not(osslconf = "OPENSSL_NO_TLSEXT"))]
            tlsext_ticklen: size_t,
            #[cfg(not(osslconf = "OPENSSL_NO_TLSEXT"))]
            tlsext_tick_lifetime_hint: c_long,
            #[cfg(not(osslconf = "OPENSSL_NO_SRP"))]
            srp_username: *mut c_char,
        }
    }
}

stack!(stack_st_SSL_CIPHER);

#[repr(C)]
pub struct SRTP_PROTECTION_PROFILE {
    pub name: *const c_char,
    pub id: c_ulong,
}

stack!(stack_st_SRTP_PROTECTION_PROFILE);

pub type tls_session_ticket_ext_cb_fn =
    Option<unsafe extern "C" fn(*mut SSL, *const c_uchar, c_int, *mut c_void) -> c_int>;
pub type tls_session_secret_cb_fn = Option<
    unsafe extern "C" fn(
        *mut SSL,
        *mut c_void,
        *mut c_int,
        *mut stack_st_SSL_CIPHER,
        *mut *mut SSL_CIPHER,
        *mut c_void,
    ) -> c_int,
>;

#[cfg(ossl111)]
pub type SSL_custom_ext_add_cb_ex = Option<
    unsafe extern "C" fn(
        ssl: *mut SSL,
        ext_type: c_uint,
        context: c_uint,
        out: *mut *const c_uchar,
        outlen: *mut size_t,
        x: *mut X509,
        chainidx: size_t,
        al: *mut c_int,
        add_arg: *mut c_void,
    ) -> c_int,
>;

#[cfg(ossl111)]
pub type SSL_custom_ext_free_cb_ex = Option<
    unsafe extern "C" fn(
        ssl: *mut SSL,
        ext_type: c_uint,
        context: c_uint,
        out: *const c_uchar,
        add_arg: *mut c_void,
    ),
>;

#[cfg(ossl111)]
pub type SSL_custom_ext_parse_cb_ex = Option<
    unsafe extern "C" fn(
        ssl: *mut SSL,
        ext_type: c_uint,
        context: c_uint,
        input: *const c_uchar,
        inlen: size_t,
        x: *mut X509,
        chainidx: size_t,
        al: *mut c_int,
        parse_arg: *mut c_void,
    ) -> c_int,
>;

cfg_if! {
    if #[cfg(ossl300)] {
        extern "C" {
            pub fn SSL_CTX_get_options(ctx: *const SSL_CTX) -> u64;
            pub fn SSL_CTX_set_options(ctx: *mut SSL_CTX, op: u64) -> u64;
            pub fn SSL_CTX_clear_options(ctx: *mut SSL_CTX, op: u64) -> u64;
        }
    } else if #[cfg(ossl110)] {
        extern "C" {
            pub fn SSL_CTX_get_options(ctx: *const SSL_CTX) -> c_ulong;
            pub fn SSL_CTX_set_options(ctx: *mut SSL_CTX, op: c_ulong) -> c_ulong;
            pub fn SSL_CTX_clear_options(ctx: *mut SSL_CTX, op: c_ulong) -> c_ulong;
        }
    }
}

pub type GEN_SESSION_CB =
    Option<unsafe extern "C" fn(*const SSL, *mut c_uchar, *mut c_uint) -> c_int>;

extern "C" {
    pub fn SSL_CTX_sess_set_new_cb(
        ctx: *mut SSL_CTX,
        new_session_cb: Option<unsafe extern "C" fn(*mut SSL, *mut SSL_SESSION) -> c_int>,
    );
    pub fn SSL_CTX_sess_set_remove_cb(
        ctx: *mut SSL_CTX,
        remove_session_cb: Option<unsafe extern "C" fn(*mut SSL_CTX, *mut SSL_SESSION)>,
    );
}
cfg_if! {
    // const change in passed function pointer signature
    if #[cfg(any(ossl110, libressl280))] {
        extern "C" {
            pub fn SSL_CTX_sess_set_get_cb(
                ctx: *mut SSL_CTX,
                get_session_cb: Option<
                    unsafe extern "C" fn(*mut SSL, *const c_uchar, c_int, *mut c_int) -> *mut SSL_SESSION,
                >,
            );
        }
    } else {
        extern "C" {
            pub fn SSL_CTX_sess_set_get_cb(
                ctx: *mut SSL_CTX,
                get_session_cb: Option<
                    unsafe extern "C" fn(*mut SSL, *mut c_uchar, c_int, *mut c_int) -> *mut SSL_SESSION,
                >,
            );
        }
    }
}
extern "C" {
    // FIXME change to unsafe extern "C" fn
    pub fn SSL_CTX_set_cookie_generate_cb(
        s: *mut SSL_CTX,
        cb: Option<
            extern "C" fn(ssl: *mut SSL, cookie: *mut c_uchar, cookie_len: *mut c_uint) -> c_int,
        >,
    );
}

cfg_if! {
    // const change in passed function pointer signature
    if #[cfg(any(ossl110, libressl280))] {
        extern "C" {
            pub fn SSL_CTX_set_cookie_verify_cb(
                s: *mut SSL_CTX,
                cb: Option<
                    extern "C" fn(ssl: *mut SSL, cookie: *const c_uchar, cookie_len: c_uint) -> c_int,
                >,
            );
        }
    } else {
        extern "C" {
            pub fn SSL_CTX_set_cookie_verify_cb(
                s: *mut SSL_CTX,
                cb: Option<extern "C" fn(ssl: *mut SSL, cookie: *mut c_uchar, cookie_len: c_uint) -> c_int>,
            );
        }
    }
}

extern "C" {
    #[cfg(ossl111)]
    pub fn SSL_CTX_set_stateless_cookie_generate_cb(
        s: *mut SSL_CTX,
        cb: Option<
            unsafe extern "C" fn(
                ssl: *mut SSL,
                cookie: *mut c_uchar,
                cookie_len: *mut size_t,
            ) -> c_int,
        >,
    );
    #[cfg(ossl111)]
    pub fn SSL_CTX_set_stateless_cookie_verify_cb(
        s: *mut SSL_CTX,
        cb: Option<
            unsafe extern "C" fn(
                ssl: *mut SSL,
                cookie: *const c_uchar,
                cookie_len: size_t,
            ) -> c_int,
        >,
    );

    pub fn SSL_CTX_set_next_protos_advertised_cb(
        ssl: *mut SSL_CTX,
        cb: extern "C" fn(
            ssl: *mut SSL,
            out: *mut *const c_uchar,
            outlen: *mut c_uint,
            arg: *mut c_void,
        ) -> c_int,
        arg: *mut c_void,
    );
    pub fn SSL_CTX_set_next_proto_select_cb(
        ssl: *mut SSL_CTX,
        cb: extern "C" fn(
            ssl: *mut SSL,
            out: *mut *mut c_uchar,
            outlen: *mut c_uchar,
            inbuf: *const c_uchar,
            inlen: c_uint,
            arg: *mut c_void,
        ) -> c_int,
        arg: *mut c_void,
    );
    pub fn SSL_get0_next_proto_negotiated(
        s: *const SSL,
        data: *mut *const c_uchar,
        len: *mut c_uint,
    );

    pub fn SSL_select_next_proto(
        out: *mut *mut c_uchar,
        outlen: *mut c_uchar,
        inbuf: *const c_uchar,
        inlen: c_uint,
        client: *const c_uchar,
        client_len: c_uint,
    ) -> c_int;
}

extern "C" {
    #[cfg(any(ossl102, libressl261))]
    pub fn SSL_CTX_set_alpn_protos(s: *mut SSL_CTX, data: *const c_uchar, len: c_uint) -> c_int;
    #[cfg(any(ossl102, libressl261))]
    pub fn SSL_set_alpn_protos(s: *mut SSL, data: *const c_uchar, len: c_uint) -> c_int;
    #[cfg(any(ossl102, libressl261))]
    #[link_name = "SSL_CTX_set_alpn_select_cb"]
    pub fn SSL_CTX_set_alpn_select_cb__fixed_rust(
        ssl: *mut SSL_CTX,
        cb: Option<
            unsafe extern "C" fn(
                ssl: *mut SSL,
                out: *mut *const c_uchar,
                outlen: *mut c_uchar,
                inbuf: *const c_uchar,
                inlen: c_uint,
                arg: *mut c_void,
            ) -> c_int,
        >,
        arg: *mut c_void,
    );
    #[cfg(any(ossl102, libressl261))]
    pub fn SSL_get0_alpn_selected(s: *const SSL, data: *mut *const c_uchar, len: *mut c_uint);
}

#[cfg(not(osslconf = "OPENSSL_NO_PSK"))]
extern "C" {
    pub fn SSL_CTX_set_psk_client_callback(
        ssl: *mut SSL_CTX,
        psk_client_cb: Option<
            extern "C" fn(
                *mut SSL,
                *const c_char,
                *mut c_char,
                c_uint,
                *mut c_uchar,
                c_uint,
            ) -> c_uint,
        >,
    );
    pub fn SSL_CTX_set_psk_server_callback(
        ssl: *mut SSL_CTX,
        psk_server_cb: Option<
            extern "C" fn(*mut SSL, *const c_char, *mut c_uchar, c_uint) -> c_uint,
        >,
    );
    pub fn SSL_get_psk_identity_hint(ssl: *const SSL) -> *const c_char;
    pub fn SSL_get_psk_identity(ssl: *const SSL) -> *const c_char;
}

extern "C" {
    #[cfg(ossl111)]
    pub fn SSL_CTX_add_custom_ext(
        ctx: *mut SSL_CTX,
        ext_type: c_uint,
        context: c_uint,
        add_cb: SSL_custom_ext_add_cb_ex,
        free_cb: SSL_custom_ext_free_cb_ex,
        add_arg: *mut c_void,
        parse_cb: SSL_custom_ext_parse_cb_ex,
        parse_arg: *mut c_void,
    ) -> c_int;

    #[cfg(ossl102)]
    pub fn SSL_extension_supported(ext_type: c_uint) -> c_int;
}

#[cfg(ossl111)]
pub type SSL_CTX_keylog_cb_func =
    Option<unsafe extern "C" fn(ssl: *const SSL, line: *const c_char)>;

extern "C" {
    #[cfg(ossl111)]
    pub fn SSL_CTX_set_keylog_callback(ctx: *mut SSL_CTX, cb: SSL_CTX_keylog_cb_func);

    #[cfg(any(ossl111, libressl340))]
    pub fn SSL_CTX_set_max_early_data(ctx: *mut SSL_CTX, max_early_data: u32) -> c_int;
    #[cfg(any(ossl111, libressl340))]
    pub fn SSL_CTX_get_max_early_data(ctx: *const SSL_CTX) -> u32;
    #[cfg(any(ossl111, libressl340))]
    pub fn SSL_set_max_early_data(ctx: *mut SSL, max_early_data: u32) -> c_int;
    #[cfg(any(ossl111, libressl340))]
    pub fn SSL_get_max_early_data(ctx: *const SSL) -> u32;

    pub fn SSL_get_finished(s: *const SSL, buf: *mut c_void, count: size_t) -> size_t;
    pub fn SSL_get_peer_finished(s: *const SSL, buf: *mut c_void, count: size_t) -> size_t;

    pub fn SSL_CTX_get_verify_mode(ctx: *const SSL_CTX) -> c_int;
    pub fn SSL_get_verify_mode(s: *const SSL) -> c_int;
}

const_ptr_api! {
    extern "C" {
        #[cfg(ossl110)]
        pub fn SSL_is_init_finished(s: #[const_ptr_if(ossl111)] SSL) -> c_int;
    }
}

cfg_if! {
    if #[cfg(libressl261)] {
        extern "C" {
            pub fn SSL_CTX_set_min_proto_version(ctx: *mut SSL_CTX, version: u16) -> c_int;
            pub fn SSL_CTX_set_max_proto_version(ctx: *mut SSL_CTX, version: u16) -> c_int;
            pub fn SSL_set_min_proto_version(s: *mut SSL, version: u16) -> c_int;
            pub fn SSL_set_max_proto_version(s: *mut SSL, version: u16) -> c_int;
        }
    }
}

cfg_if! {
    if #[cfg(libressl270)] {
        extern "C" {
            pub fn SSL_CTX_get_min_proto_version(ctx: *mut SSL_CTX) -> c_int;
            pub fn SSL_CTX_get_max_proto_version(ctx: *mut SSL_CTX) -> c_int;
            pub fn SSL_get_min_proto_version(s: *mut SSL) -> c_int;
            pub fn SSL_get_max_proto_version(s: *mut SSL) -> c_int;
        }
    }
}

extern "C" {
    pub fn SSL_CTX_set_cipher_list(ssl: *mut SSL_CTX, s: *const c_char) -> c_int;
    pub fn SSL_CTX_new(method: *const SSL_METHOD) -> *mut SSL_CTX;
    pub fn SSL_CTX_free(ctx: *mut SSL_CTX);
    #[cfg(any(ossl110, libressl273))]
    pub fn SSL_CTX_up_ref(x: *mut SSL_CTX) -> c_int;
    pub fn SSL_CTX_get_cert_store(ctx: *const SSL_CTX) -> *mut X509_STORE;
    pub fn SSL_CTX_set_cert_store(ctx: *mut SSL_CTX, store: *mut X509_STORE);

    pub fn SSL_get_current_cipher(ssl: *const SSL) -> *const SSL_CIPHER;
    pub fn SSL_CIPHER_get_bits(cipher: *const SSL_CIPHER, alg_bits: *mut c_int) -> c_int;
}
const_ptr_api! {
    extern "C" {
        pub fn SSL_CIPHER_get_version(cipher: *const SSL_CIPHER) -> #[const_ptr_if(any(ossl110, libressl280))] c_char;
    }
}
extern "C" {
    #[cfg(ossl111)]
    pub fn SSL_CIPHER_get_handshake_digest(cipher: *const SSL_CIPHER) -> *const EVP_MD;
    pub fn SSL_CIPHER_get_name(cipher: *const SSL_CIPHER) -> *const c_char;
    #[cfg(ossl111)]
    pub fn SSL_CIPHER_standard_name(cipher: *const SSL_CIPHER) -> *const c_char;
    #[cfg(ossl111)]
    pub fn OPENSSL_cipher_name(rfc_name: *const c_char) -> *const c_char;

    pub fn SSL_pending(ssl: *const SSL) -> c_int;
    pub fn SSL_set_bio(ssl: *mut SSL, rbio: *mut BIO, wbio: *mut BIO);
    pub fn SSL_get_rbio(ssl: *const SSL) -> *mut BIO;
    pub fn SSL_get_wbio(ssl: *const SSL) -> *mut BIO;
    #[cfg(any(ossl111, libressl340))]
    pub fn SSL_CTX_set_ciphersuites(ctx: *mut SSL_CTX, str: *const c_char) -> c_int;
    #[cfg(any(ossl111, libressl340))]
    pub fn SSL_set_ciphersuites(ssl: *mut SSL, str: *const c_char) -> c_int;
    pub fn SSL_set_cipher_list(ssl: *mut SSL, s: *const c_char) -> c_int;
    pub fn SSL_set_ssl_method(s: *mut SSL, method: *const SSL_METHOD) -> c_int;
    pub fn SSL_set_verify(
        ssl: *mut SSL,
        mode: c_int,
        // FIXME should be unsafe
        verify_callback: Option<extern "C" fn(c_int, *mut X509_STORE_CTX) -> c_int>,
    );
    pub fn SSL_CTX_use_PrivateKey(ctx: *mut SSL_CTX, key: *mut EVP_PKEY) -> c_int;
    pub fn SSL_CTX_use_certificate(ctx: *mut SSL_CTX, cert: *mut X509) -> c_int;

    pub fn SSL_CTX_use_PrivateKey_file(
        ctx: *mut SSL_CTX,
        key_file: *const c_char,
        file_type: c_int,
    ) -> c_int;
    pub fn SSL_CTX_use_certificate_file(
        ctx: *mut SSL_CTX,
        cert_file: *const c_char,
        file_type: c_int,
    ) -> c_int;
    pub fn SSL_CTX_use_certificate_chain_file(
        ctx: *mut SSL_CTX,
        cert_chain_file: *const c_char,
    ) -> c_int;
    pub fn SSL_use_PrivateKey_file(ssl: *mut SSL, file: *const c_char, type_: c_int) -> c_int;
    pub fn SSL_use_PrivateKey(ssl: *mut SSL, pkey: *mut EVP_PKEY) -> c_int;
    pub fn SSL_use_certificate(ssl: *mut SSL, x: *mut X509) -> c_int;
    #[cfg(any(ossl110, libressl332))]
    pub fn SSL_use_certificate_chain_file(ssl: *mut SSL, file: *const c_char) -> c_int;
    pub fn SSL_set_client_CA_list(s: *mut SSL, name_list: *mut stack_st_X509_NAME);
    pub fn SSL_add_client_CA(ssl: *mut SSL, x: *mut X509) -> c_int;
    pub fn SSL_load_client_CA_file(file: *const c_char) -> *mut stack_st_X509_NAME;

    #[cfg(not(ossl110))]
    pub fn SSL_load_error_strings();
    pub fn SSL_state_string(ssl: *const SSL) -> *const c_char;
    pub fn SSL_state_string_long(ssl: *const SSL) -> *const c_char;

    pub fn SSL_SESSION_get_time(s: *const SSL_SESSION) -> c_long;
    pub fn SSL_SESSION_get_timeout(s: *const SSL_SESSION) -> c_long;
    #[cfg(any(ossl110, libressl270))]
    pub fn SSL_SESSION_get_protocol_version(s: *const SSL_SESSION) -> c_int;

    #[cfg(any(ossl111, libressl340))]
    pub fn SSL_SESSION_set_max_early_data(ctx: *mut SSL_SESSION, max_early_data: u32) -> c_int;
    #[cfg(any(ossl111, libressl340))]
    pub fn SSL_SESSION_get_max_early_data(ctx: *const SSL_SESSION) -> u32;

    pub fn SSL_SESSION_get_id(s: *const SSL_SESSION, len: *mut c_uint) -> *const c_uchar;
    #[cfg(any(ossl110, libressl273))]
    pub fn SSL_SESSION_up_ref(ses: *mut SSL_SESSION) -> c_int;
    pub fn SSL_SESSION_free(s: *mut SSL_SESSION);
}
const_ptr_api! {
    extern "C" {
        pub fn i2d_SSL_SESSION(s: #[const_ptr_if(ossl300)] SSL_SESSION, pp: *mut *mut c_uchar) -> c_int;
    }
}
extern "C" {
    pub fn SSL_set_session(ssl: *mut SSL, session: *mut SSL_SESSION) -> c_int;
    pub fn SSL_CTX_add_session(ctx: *mut SSL_CTX, session: *mut SSL_SESSION) -> c_int;
    pub fn SSL_CTX_remove_session(ctx: *mut SSL_CTX, session: *mut SSL_SESSION) -> c_int;
    pub fn d2i_SSL_SESSION(
        a: *mut *mut SSL_SESSION,
        pp: *mut *const c_uchar,
        len: c_long,
    ) -> *mut SSL_SESSION;

    #[cfg(not(ossl300))]
    pub fn SSL_get_peer_certificate(ssl: *const SSL) -> *mut X509;
    #[cfg(ossl300)]
    pub fn SSL_get1_peer_certificate(ssl: *const SSL) -> *mut X509;

    pub fn SSL_get_peer_cert_chain(ssl: *const SSL) -> *mut stack_st_X509;

    pub fn SSL_CTX_set_verify(
        ctx: *mut SSL_CTX,
        mode: c_int,
        verify_callback: Option<extern "C" fn(c_int, *mut X509_STORE_CTX) -> c_int>,
    );
    pub fn SSL_CTX_set_verify_depth(ctx: *mut SSL_CTX, depth: c_int);

    #[cfg(any(ossl111, libressl340))]
    pub fn SSL_CTX_set_post_handshake_auth(ctx: *mut SSL_CTX, val: c_int);

    pub fn SSL_CTX_check_private_key(ctx: *const SSL_CTX) -> c_int;

    pub fn SSL_CTX_set_session_id_context(
        ssl: *mut SSL_CTX,
        sid_ctx: *const c_uchar,
        sid_ctx_len: c_uint,
    ) -> c_int;

    pub fn SSL_new(ctx: *mut SSL_CTX) -> *mut SSL;

    #[cfg(any(ossl102, libressl261))]
    pub fn SSL_CTX_get0_param(ctx: *mut SSL_CTX) -> *mut X509_VERIFY_PARAM;

    #[cfg(any(ossl102, libressl261))]
    pub fn SSL_get0_param(ssl: *mut SSL) -> *mut X509_VERIFY_PARAM;
}

#[cfg(ossl111)]
pub type SSL_client_hello_cb_fn =
    Option<unsafe extern "C" fn(s: *mut SSL, al: *mut c_int, arg: *mut c_void) -> c_int>;
extern "C" {
    #[cfg(ossl111)]
    pub fn SSL_CTX_set_client_hello_cb(
        c: *mut SSL_CTX,
        cb: SSL_client_hello_cb_fn,
        arg: *mut c_void,
    );
    #[cfg(ossl111)]
    pub fn SSL_client_hello_isv2(s: *mut SSL) -> c_int;
    #[cfg(ossl111)]
    pub fn SSL_client_hello_get0_legacy_version(s: *mut SSL) -> c_uint;
    #[cfg(ossl111)]
    pub fn SSL_client_hello_get0_random(s: *mut SSL, out: *mut *const c_uchar) -> size_t;
    #[cfg(ossl111)]
    pub fn SSL_client_hello_get0_session_id(s: *mut SSL, out: *mut *const c_uchar) -> size_t;
    #[cfg(ossl111)]
    pub fn SSL_client_hello_get0_ciphers(s: *mut SSL, out: *mut *const c_uchar) -> size_t;
    #[cfg(ossl111)]
    pub fn SSL_client_hello_get0_compression_methods(
        s: *mut SSL,
        out: *mut *const c_uchar,
    ) -> size_t;
    #[cfg(ossl111)]
    pub fn SSL_client_hello_get1_extensions_present(
        s: *mut SSL,
        out: *mut *mut c_int,
        outlen: *mut size_t,
    ) -> c_int;
    #[cfg(ossl111)]
    pub fn SSL_client_hello_get0_ext(
        s: *mut SSL,
        type_: c_uint,
        out: *mut *const c_uchar,
        outlen: *mut size_t,
    ) -> c_int;

    pub fn SSL_free(ssl: *mut SSL);
    pub fn SSL_accept(ssl: *mut SSL) -> c_int;
    #[cfg(ossl111)]
    pub fn SSL_stateless(s: *mut SSL) -> c_int;
    pub fn SSL_connect(ssl: *mut SSL) -> c_int;
    pub fn SSL_read(ssl: *mut SSL, buf: *mut c_void, num: c_int) -> c_int;
    #[cfg(any(ossl111, libressl350))]
    pub fn SSL_read_ex(ssl: *mut SSL, buf: *mut c_void, num: usize, readbytes: *mut usize)
        -> c_int;
    pub fn SSL_peek(ssl: *mut SSL, buf: *mut c_void, num: c_int) -> c_int;
    #[cfg(any(ossl111, libressl350))]
    pub fn SSL_peek_ex(ssl: *mut SSL, buf: *mut c_void, num: usize, readbytes: *mut usize)
        -> c_int;
    #[cfg(any(ossl111, libressl340))]
    pub fn SSL_read_early_data(
        s: *mut SSL,
        buf: *mut c_void,
        num: size_t,
        readbytes: *mut size_t,
    ) -> c_int;
    #[cfg(ossl111)]
    pub fn SSL_bytes_to_cipher_list(
        s: *mut SSL,
        bytes: *const c_uchar,
        len: size_t,
        isv2format: c_int,
        sk: *mut *mut stack_st_SSL_CIPHER,
        scsvs: *mut *mut stack_st_SSL_CIPHER,
    ) -> c_int;
}

extern "C" {
    pub fn SSL_write(ssl: *mut SSL, buf: *const c_void, num: c_int) -> c_int;
    #[cfg(any(ossl111, libressl350))]
    pub fn SSL_write_ex(
        ssl: *mut SSL,
        buf: *const c_void,
        num: size_t,
        written: *mut size_t,
    ) -> c_int;
    #[cfg(any(ossl111, libressl340))]
    pub fn SSL_write_early_data(
        s: *mut SSL,
        buf: *const c_void,
        num: size_t,
        written: *mut size_t,
    ) -> c_int;
    pub fn SSL_ctrl(ssl: *mut SSL, cmd: c_int, larg: c_long, parg: *mut c_void) -> c_long;
    pub fn SSL_CTX_ctrl(ctx: *mut SSL_CTX, cmd: c_int, larg: c_long, parg: *mut c_void) -> c_long;
    #[link_name = "SSL_CTX_callback_ctrl"]
    pub fn SSL_CTX_callback_ctrl__fixed_rust(
        ctx: *mut SSL_CTX,
        cmd: c_int,
        fp: Option<unsafe extern "C" fn()>,
    ) -> c_long;
}

cfg_if! {
    if #[cfg(any(ossl110, libressl291))] {
        extern "C" {
            pub fn TLS_method() -> *const SSL_METHOD;

            pub fn DTLS_method() -> *const SSL_METHOD;

            pub fn TLS_server_method() -> *const SSL_METHOD;

            pub fn TLS_client_method() -> *const SSL_METHOD;
        }
    } else {
        extern "C" {
            #[cfg(not(osslconf = "OPENSSL_NO_SSL3_METHOD"))]
            pub fn SSLv3_method() -> *const SSL_METHOD;

            pub fn SSLv23_method() -> *const SSL_METHOD;

            pub fn SSLv23_client_method() -> *const SSL_METHOD;

            pub fn SSLv23_server_method() -> *const SSL_METHOD;

            pub fn TLSv1_method() -> *const SSL_METHOD;

            pub fn TLSv1_1_method() -> *const SSL_METHOD;

            pub fn TLSv1_2_method() -> *const SSL_METHOD;

            pub fn DTLSv1_method() -> *const SSL_METHOD;

            #[cfg(ossl102)]
            pub fn DTLSv1_2_method() -> *const SSL_METHOD;
        }
    }
}

extern "C" {
    pub fn SSL_get_error(ssl: *const SSL, ret: c_int) -> c_int;
    pub fn SSL_get_version(ssl: *const SSL) -> *const c_char;

    pub fn SSL_do_handshake(ssl: *mut SSL) -> c_int;
    pub fn SSL_shutdown(ssl: *mut SSL) -> c_int;

    pub fn SSL_CTX_set_client_CA_list(ctx: *mut SSL_CTX, list: *mut stack_st_X509_NAME);

    pub fn SSL_CTX_add_client_CA(ctx: *mut SSL_CTX, cacert: *mut X509) -> c_int;

    pub fn SSL_CTX_set_default_verify_paths(ctx: *mut SSL_CTX) -> c_int;
    pub fn SSL_CTX_load_verify_locations(
        ctx: *mut SSL_CTX,
        CAfile: *const c_char,
        CApath: *const c_char,
    ) -> c_int;
}

const_ptr_api! {
    extern "C" {
        pub fn SSL_get_ssl_method(ssl: #[const_ptr_if(ossl111b)] SSL) -> *const SSL_METHOD;
    }
}

extern "C" {
    pub fn SSL_set_connect_state(s: *mut SSL);
    pub fn SSL_set_accept_state(s: *mut SSL);

    #[cfg(not(ossl110))]
    pub fn SSL_library_init() -> c_int;

    pub fn SSL_CIPHER_description(
        cipher: *const SSL_CIPHER,
        buf: *mut c_char,
        size: c_int,
    ) -> *mut c_char;

    pub fn SSL_get_certificate(ssl: *const SSL) -> *mut X509;
}
const_ptr_api! {
    extern "C" {
        pub fn SSL_get_privatekey(ssl: #[const_ptr_if(any(ossl102, libressl280))] SSL) -> *mut EVP_PKEY;
    }
}

extern "C" {
    #[cfg(any(ossl102, libressl270))]
    pub fn SSL_CTX_get0_certificate(ctx: *const SSL_CTX) -> *mut X509;
    #[cfg(any(ossl102, libressl340))]
    pub fn SSL_CTX_get0_privatekey(ctx: *const SSL_CTX) -> *mut EVP_PKEY;

    pub fn SSL_set_shutdown(ss: *mut SSL, mode: c_int);
    pub fn SSL_get_shutdown(ssl: *const SSL) -> c_int;
    pub fn SSL_version(ssl: *const SSL) -> c_int;
    pub fn SSL_get_session(s: *const SSL) -> *mut SSL_SESSION;
    pub fn SSL_get_SSL_CTX(ssl: *const SSL) -> *mut SSL_CTX;
    pub fn SSL_set_SSL_CTX(ssl: *mut SSL, ctx: *mut SSL_CTX) -> *mut SSL_CTX;

    pub fn SSL_get_verify_result(ssl: *const SSL) -> c_long;
    #[cfg(ossl110)]
    pub fn SSL_get0_verified_chain(ssl: *const SSL) -> *mut stack_st_X509;

    #[cfg(any(ossl110, libressl270))]
    pub fn SSL_get_client_random(ssl: *const SSL, out: *mut c_uchar, len: size_t) -> size_t;
    #[cfg(any(ossl110, libressl270))]
    pub fn SSL_get_server_random(ssl: *const SSL, out: *mut c_uchar, len: size_t) -> size_t;
    #[cfg(any(ossl110, libressl273))]
    pub fn SSL_SESSION_get_master_key(
        session: *const SSL_SESSION,
        out: *mut c_uchar,
        outlen: size_t,
    ) -> size_t;
}

extern "C" {
    #[cfg(not(ossl110))]
    pub fn SSL_get_ex_new_index(
        argl: c_long,
        argp: *mut c_void,
        new_func: Option<CRYPTO_EX_new>,
        dup_func: Option<CRYPTO_EX_dup>,
        free_func: Option<CRYPTO_EX_free>,
    ) -> c_int;

    pub fn SSL_set_ex_data(ssl: *mut SSL, idx: c_int, data: *mut c_void) -> c_int;
    pub fn SSL_get_ex_data(ssl: *const SSL, idx: c_int) -> *mut c_void;

    #[cfg(not(ossl110))]
    pub fn SSL_CTX_get_ex_new_index(
        argl: c_long,
        argp: *mut c_void,
        new_func: Option<CRYPTO_EX_new>,
        dup_func: Option<CRYPTO_EX_dup>,
        free_func: Option<CRYPTO_EX_free>,
    ) -> c_int;

    pub fn SSL_CTX_set_ex_data(ctx: *mut SSL_CTX, idx: c_int, data: *mut c_void) -> c_int;
    pub fn SSL_CTX_get_ex_data(ctx: *const SSL_CTX, idx: c_int) -> *mut c_void;

    pub fn SSL_get_ex_data_X509_STORE_CTX_idx() -> c_int;
}

extern "C" {
    #[link_name = "SSL_CTX_set_tmp_dh_callback"]
    pub fn SSL_CTX_set_tmp_dh_callback__fixed_rust(
        ctx: *mut SSL_CTX,
        dh: Option<
            unsafe extern "C" fn(ssl: *mut SSL, is_export: c_int, keylength: c_int) -> *mut DH,
        >,
    );
    #[link_name = "SSL_set_tmp_dh_callback"]
    pub fn SSL_set_tmp_dh_callback__fixed_rust(
        ctx: *mut SSL,
        dh: Option<
            unsafe extern "C" fn(ssl: *mut SSL, is_export: c_int, keylength: c_int) -> *mut DH,
        >,
    );
    #[cfg(not(ossl110))]
    #[link_name = "SSL_CTX_set_tmp_ecdh_callback"]
    pub fn SSL_CTX_set_tmp_ecdh_callback__fixed_rust(
        ctx: *mut SSL_CTX,
        ecdh: Option<
            unsafe extern "C" fn(ssl: *mut SSL, is_export: c_int, keylength: c_int) -> *mut EC_KEY,
        >,
    );
    #[cfg(not(ossl110))]
    #[link_name = "SSL_set_tmp_ecdh_callback"]
    pub fn SSL_set_tmp_ecdh_callback__fixed_rust(
        ssl: *mut SSL,
        ecdh: Option<
            unsafe extern "C" fn(ssl: *mut SSL, is_export: c_int, keylength: c_int) -> *mut EC_KEY,
        >,
    );
}

cfg_if! {
    if #[cfg(libressl)] {
        extern "C" {
            pub fn SSL_get_current_compression(ssl: *mut SSL) -> *const libc::c_void;
        }
    } else if #[cfg(not(osslconf = "OPENSSL_NO_COMP"))] {
        const_ptr_api! {
            extern "C" {
                pub fn SSL_get_current_compression(ssl: #[const_ptr_if(ossl111b)] SSL) -> *const COMP_METHOD;
            }
        }
    }
}
cfg_if! {
    if #[cfg(libressl)] {
        extern "C" {
            pub fn SSL_COMP_get_name(comp: *const libc::c_void) -> *const c_char;
        }
    } else if #[cfg(not(osslconf = "OPENSSL_NO_COMP"))] {
        extern "C" {
            pub fn SSL_COMP_get_name(comp: *const COMP_METHOD) -> *const c_char;
        }
    }
}

#[cfg(not(osslconf = "OPENSSL_NO_COMP"))]
extern "C" {
    #[cfg(ossl110)]
    pub fn COMP_get_type(meth: *const COMP_METHOD) -> i32;
}

extern "C" {
    #[cfg(any(ossl110, libressl270))]
    pub fn SSL_CIPHER_get_cipher_nid(c: *const SSL_CIPHER) -> c_int;
    #[cfg(any(ossl110, libressl270))]
    pub fn SSL_CIPHER_get_digest_nid(c: *const SSL_CIPHER) -> c_int;
}

const_ptr_api! {
    extern "C" {
        #[cfg(ossl110)]
        pub fn SSL_session_reused(ssl: #[const_ptr_if(ossl111c)] SSL) -> c_int;
    }
}

const_ptr_api! {
    extern "C" {
        #[cfg(any(ossl102, libressl273))]
        pub fn SSL_is_server(s: #[const_ptr_if(any(ossl110f, libressl273))] SSL) -> c_int;
    }
}

extern "C" {
    #[cfg(ossl110)]
    pub fn OPENSSL_init_ssl(opts: u64, settings: *const OPENSSL_INIT_SETTINGS) -> c_int;
}

extern "C" {
    #[cfg(ossl111)]
    pub fn SSL_CTX_set_num_tickets(ctx: *mut SSL_CTX, num_tickets: size_t) -> c_int;

    #[cfg(ossl111)]
    pub fn SSL_set_num_tickets(s: *mut SSL, num_tickets: size_t) -> c_int;

    #[cfg(ossl111b)]
    pub fn SSL_CTX_get_num_tickets(ctx: *const SSL_CTX) -> size_t;
    #[cfg(all(ossl111, not(ossl111b)))]
    pub fn SSL_CTX_get_num_tickets(ctx: *mut SSL_CTX) -> size_t;

    #[cfg(ossl111b)]
    pub fn SSL_get_num_tickets(s: *const SSL) -> size_t;
    #[cfg(all(ossl111, not(ossl111b)))]
    pub fn SSL_get_num_tickets(s: *mut SSL) -> size_t;
}

extern "C" {
    #[cfg(any(ossl110, libressl360))]
    pub fn SSL_CTX_set_security_level(ctx: *mut SSL_CTX, level: c_int);

    #[cfg(any(ossl110, libressl360))]
    pub fn SSL_set_security_level(s: *mut SSL, level: c_int);

    #[cfg(any(ossl110, libressl360))]
    pub fn SSL_CTX_get_security_level(ctx: *const SSL_CTX) -> c_int;

    #[cfg(any(ossl110, libressl360))]
    pub fn SSL_get_security_level(s: *const SSL) -> c_int;
}