This file is indexed.

/usr/include/libssh2.h is in libssh2-1-dev 1.5.0-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   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
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
/* Copyright (c) 2004-2009, Sara Golemon <sarag@libssh2.org>
 * Copyright (c) 2009-2012 Daniel Stenberg
 * Copyright (c) 2010 Simon Josefsson <simon@josefsson.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms,
 * with or without modification, are permitted provided
 * that the following conditions are met:
 *
 *   Redistributions of source code must retain the above
 *   copyright notice, this list of conditions and the
 *   following disclaimer.
 *
 *   Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 *   Neither the name of the copyright holder nor the names
 *   of any other contributors may be used to endorse or
 *   promote products derived from this software without
 *   specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 */

#ifndef LIBSSH2_H
#define LIBSSH2_H 1

#define LIBSSH2_COPYRIGHT "2004-2014 The libssh2 project and its contributors."

/* We use underscore instead of dash when appending DEV in dev versions just
   to make the BANNER define (used by src/session.c) be a valid SSH
   banner. Release versions have no appended strings and may of course not
   have dashes either. */
#define LIBSSH2_VERSION "1.5.0"

/* The numeric version number is also available "in parts" by using these
   defines: */
#define LIBSSH2_VERSION_MAJOR 1
#define LIBSSH2_VERSION_MINOR 5
#define LIBSSH2_VERSION_PATCH 0

/* This is the numeric version of the libssh2 version number, meant for easier
   parsing and comparions by programs. The LIBSSH2_VERSION_NUM define will
   always follow this syntax:

         0xXXYYZZ

   Where XX, YY and ZZ are the main version, release and patch numbers in
   hexadecimal (using 8 bits each). All three numbers are always represented
   using two digits.  1.2 would appear as "0x010200" while version 9.11.7
   appears as "0x090b07".

   This 6-digit (24 bits) hexadecimal number does not show pre-release number,
   and it is always a greater number in a more recent release. It makes
   comparisons with greater than and less than work.
*/
#define LIBSSH2_VERSION_NUM 0x010500

/*
 * This is the date and time when the full source package was created. The
 * timestamp is not stored in the source code repo, as the timestamp is
 * properly set in the tarballs by the maketgz script.
 *
 * The format of the date should follow this template:
 *
 * "Mon Feb 12 11:35:33 UTC 2007"
 */
#define LIBSSH2_TIMESTAMP "Wed Mar 11 07:08:36 UTC 2015"

#ifndef RC_INVOKED

#ifdef __cplusplus
extern "C" {
#endif
#ifdef _WIN32
# include <basetsd.h>
# include <winsock2.h>
#endif

#include <stddef.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>

/* Allow alternate API prefix from CFLAGS or calling app */
#ifndef LIBSSH2_API
# ifdef LIBSSH2_WIN32
#  ifdef _WINDLL
#   ifdef LIBSSH2_LIBRARY
#    define LIBSSH2_API __declspec(dllexport)
#   else
#    define LIBSSH2_API __declspec(dllimport)
#   endif /* LIBSSH2_LIBRARY */
#  else
#   define LIBSSH2_API
#  endif
# else /* !LIBSSH2_WIN32 */
#  define LIBSSH2_API
# endif /* LIBSSH2_WIN32 */
#endif /* LIBSSH2_API */

#if defined(LIBSSH2_DARWIN)
# include <sys/uio.h>
#endif

#if (defined(NETWARE) && !defined(__NOVELL_LIBC__))
# include <sys/bsdskt.h>
typedef unsigned char uint8_t;
typedef unsigned int uint32_t;
#endif

#ifdef _MSC_VER
typedef unsigned char uint8_t;
typedef unsigned int uint32_t;
typedef unsigned __int64 libssh2_uint64_t;
typedef __int64 libssh2_int64_t;
#ifndef ssize_t
typedef SSIZE_T ssize_t;
#endif
#else
typedef unsigned long long libssh2_uint64_t;
typedef long long libssh2_int64_t;
#endif

#ifdef WIN32
typedef SOCKET libssh2_socket_t;
#define LIBSSH2_INVALID_SOCKET INVALID_SOCKET
#else /* !WIN32 */
typedef int libssh2_socket_t;
#define LIBSSH2_INVALID_SOCKET -1
#endif /* WIN32 */

/* Part of every banner, user specified or not */
#define LIBSSH2_SSH_BANNER                  "SSH-2.0-libssh2_" LIBSSH2_VERSION

/* We *could* add a comment here if we so chose */
#define LIBSSH2_SSH_DEFAULT_BANNER                  LIBSSH2_SSH_BANNER
#define LIBSSH2_SSH_DEFAULT_BANNER_WITH_CRLF        LIBSSH2_SSH_DEFAULT_BANNER "\r\n"

/* Default generate and safe prime sizes for diffie-hellman-group-exchange-sha1 */
#define LIBSSH2_DH_GEX_MINGROUP     1024
#define LIBSSH2_DH_GEX_OPTGROUP     1536
#define LIBSSH2_DH_GEX_MAXGROUP     2048

/* Defaults for pty requests */
#define LIBSSH2_TERM_WIDTH      80
#define LIBSSH2_TERM_HEIGHT     24
#define LIBSSH2_TERM_WIDTH_PX   0
#define LIBSSH2_TERM_HEIGHT_PX  0

/* 1/4 second */
#define LIBSSH2_SOCKET_POLL_UDELAY      250000
/* 0.25 * 120 == 30 seconds */
#define LIBSSH2_SOCKET_POLL_MAXLOOPS    120

/* Maximum size to allow a payload to compress to, plays it safe by falling
   short of spec limits */
#define LIBSSH2_PACKET_MAXCOMP      32000

/* Maximum size to allow a payload to deccompress to, plays it safe by
   allowing more than spec requires */
#define LIBSSH2_PACKET_MAXDECOMP    40000

/* Maximum size for an inbound compressed payload, plays it safe by
   overshooting spec limits */
#define LIBSSH2_PACKET_MAXPAYLOAD   40000

/* Malloc callbacks */
#define LIBSSH2_ALLOC_FUNC(name)   void *name(size_t count, void **abstract)
#define LIBSSH2_REALLOC_FUNC(name) void *name(void *ptr, size_t count, \
                                              void **abstract)
#define LIBSSH2_FREE_FUNC(name)    void name(void *ptr, void **abstract)

typedef struct _LIBSSH2_USERAUTH_KBDINT_PROMPT
{
    char* text;
    unsigned int length;
    unsigned char echo;
} LIBSSH2_USERAUTH_KBDINT_PROMPT;

typedef struct _LIBSSH2_USERAUTH_KBDINT_RESPONSE
{
    char* text;
    unsigned int length;
} LIBSSH2_USERAUTH_KBDINT_RESPONSE;

/* 'publickey' authentication callback */
#define LIBSSH2_USERAUTH_PUBLICKEY_SIGN_FUNC(name) \
  int name(LIBSSH2_SESSION *session, unsigned char **sig, size_t *sig_len, \
           const unsigned char *data, size_t data_len, void **abstract)

/* 'keyboard-interactive' authentication callback */
#define LIBSSH2_USERAUTH_KBDINT_RESPONSE_FUNC(name_) \
 void name_(const char* name, int name_len, const char* instruction, \
            int instruction_len, int num_prompts, \
            const LIBSSH2_USERAUTH_KBDINT_PROMPT* prompts, \
            LIBSSH2_USERAUTH_KBDINT_RESPONSE* responses, void **abstract)

/* Callbacks for special SSH packets */
#define LIBSSH2_IGNORE_FUNC(name) \
 void name(LIBSSH2_SESSION *session, const char *message, int message_len, \
           void **abstract)

#define LIBSSH2_DEBUG_FUNC(name) \
 void name(LIBSSH2_SESSION *session, int always_display, const char *message, \
           int message_len, const char *language, int language_len, \
           void **abstract)

#define LIBSSH2_DISCONNECT_FUNC(name) \
 void name(LIBSSH2_SESSION *session, int reason, const char *message, \
           int message_len, const char *language, int language_len, \
           void **abstract)

#define LIBSSH2_PASSWD_CHANGEREQ_FUNC(name) \
 void name(LIBSSH2_SESSION *session, char **newpw, int *newpw_len, \
           void **abstract)

#define LIBSSH2_MACERROR_FUNC(name) \
 int name(LIBSSH2_SESSION *session, const char *packet, int packet_len, \
          void **abstract)

#define LIBSSH2_X11_OPEN_FUNC(name) \
 void name(LIBSSH2_SESSION *session, LIBSSH2_CHANNEL *channel, \
           const char *shost, int sport, void **abstract)

#define LIBSSH2_CHANNEL_CLOSE_FUNC(name) \
  void name(LIBSSH2_SESSION *session, void **session_abstract, \
            LIBSSH2_CHANNEL *channel, void **channel_abstract)

/* I/O callbacks */
#define LIBSSH2_RECV_FUNC(name)  ssize_t name(libssh2_socket_t socket, \
                                              void *buffer, size_t length, \
                                              int flags, void **abstract)
#define LIBSSH2_SEND_FUNC(name)  ssize_t name(libssh2_socket_t socket, \
                                              const void *buffer, size_t length,\
                                              int flags, void **abstract)

/* libssh2_session_callback_set() constants */
#define LIBSSH2_CALLBACK_IGNORE             0
#define LIBSSH2_CALLBACK_DEBUG              1
#define LIBSSH2_CALLBACK_DISCONNECT         2
#define LIBSSH2_CALLBACK_MACERROR           3
#define LIBSSH2_CALLBACK_X11                4
#define LIBSSH2_CALLBACK_SEND               5
#define LIBSSH2_CALLBACK_RECV               6

/* libssh2_session_method_pref() constants */
#define LIBSSH2_METHOD_KEX          0
#define LIBSSH2_METHOD_HOSTKEY      1
#define LIBSSH2_METHOD_CRYPT_CS     2
#define LIBSSH2_METHOD_CRYPT_SC     3
#define LIBSSH2_METHOD_MAC_CS       4
#define LIBSSH2_METHOD_MAC_SC       5
#define LIBSSH2_METHOD_COMP_CS      6
#define LIBSSH2_METHOD_COMP_SC      7
#define LIBSSH2_METHOD_LANG_CS      8
#define LIBSSH2_METHOD_LANG_SC      9

/* flags */
#define LIBSSH2_FLAG_SIGPIPE        1
#define LIBSSH2_FLAG_COMPRESS       2

typedef struct _LIBSSH2_SESSION                     LIBSSH2_SESSION;
typedef struct _LIBSSH2_CHANNEL                     LIBSSH2_CHANNEL;
typedef struct _LIBSSH2_LISTENER                    LIBSSH2_LISTENER;
typedef struct _LIBSSH2_KNOWNHOSTS                  LIBSSH2_KNOWNHOSTS;
typedef struct _LIBSSH2_AGENT                       LIBSSH2_AGENT;

typedef struct _LIBSSH2_POLLFD {
    unsigned char type; /* LIBSSH2_POLLFD_* below */

    union {
        libssh2_socket_t socket; /* File descriptors -- examined with
                                    system select() call */
        LIBSSH2_CHANNEL *channel; /* Examined by checking internal state */
        LIBSSH2_LISTENER *listener; /* Read polls only -- are inbound
                                       connections waiting to be accepted? */
    } fd;

    unsigned long events; /* Requested Events */
    unsigned long revents; /* Returned Events */
} LIBSSH2_POLLFD;

/* Poll FD Descriptor Types */
#define LIBSSH2_POLLFD_SOCKET       1
#define LIBSSH2_POLLFD_CHANNEL      2
#define LIBSSH2_POLLFD_LISTENER     3

/* Note: Win32 Doesn't actually have a poll() implementation, so some of these
   values are faked with select() data */
/* Poll FD events/revents -- Match sys/poll.h where possible */
#define LIBSSH2_POLLFD_POLLIN           0x0001 /* Data available to be read or
                                                  connection available --
                                                  All */
#define LIBSSH2_POLLFD_POLLPRI          0x0002 /* Priority data available to
                                                  be read -- Socket only */
#define LIBSSH2_POLLFD_POLLEXT          0x0002 /* Extended data available to
                                                  be read -- Channel only */
#define LIBSSH2_POLLFD_POLLOUT          0x0004 /* Can may be written --
                                                  Socket/Channel */
/* revents only */
#define LIBSSH2_POLLFD_POLLERR          0x0008 /* Error Condition -- Socket */
#define LIBSSH2_POLLFD_POLLHUP          0x0010 /* HangUp/EOF -- Socket */
#define LIBSSH2_POLLFD_SESSION_CLOSED   0x0010 /* Session Disconnect */
#define LIBSSH2_POLLFD_POLLNVAL         0x0020 /* Invalid request -- Socket
                                                  Only */
#define LIBSSH2_POLLFD_POLLEX           0x0040 /* Exception Condition --
                                                  Socket/Win32 */
#define LIBSSH2_POLLFD_CHANNEL_CLOSED   0x0080 /* Channel Disconnect */
#define LIBSSH2_POLLFD_LISTENER_CLOSED  0x0080 /* Listener Disconnect */

#define HAVE_LIBSSH2_SESSION_BLOCK_DIRECTION
/* Block Direction Types */
#define LIBSSH2_SESSION_BLOCK_INBOUND                  0x0001
#define LIBSSH2_SESSION_BLOCK_OUTBOUND                 0x0002

/* Hash Types */
#define LIBSSH2_HOSTKEY_HASH_MD5                            1
#define LIBSSH2_HOSTKEY_HASH_SHA1                           2

/* Hostkey Types */
#define LIBSSH2_HOSTKEY_TYPE_UNKNOWN			    0
#define LIBSSH2_HOSTKEY_TYPE_RSA			    1
#define LIBSSH2_HOSTKEY_TYPE_DSS			    2

/* Disconnect Codes (defined by SSH protocol) */
#define SSH_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT          1
#define SSH_DISCONNECT_PROTOCOL_ERROR                       2
#define SSH_DISCONNECT_KEY_EXCHANGE_FAILED                  3
#define SSH_DISCONNECT_RESERVED                             4
#define SSH_DISCONNECT_MAC_ERROR                            5
#define SSH_DISCONNECT_COMPRESSION_ERROR                    6
#define SSH_DISCONNECT_SERVICE_NOT_AVAILABLE                7
#define SSH_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED       8
#define SSH_DISCONNECT_HOST_KEY_NOT_VERIFIABLE              9
#define SSH_DISCONNECT_CONNECTION_LOST                      10
#define SSH_DISCONNECT_BY_APPLICATION                       11
#define SSH_DISCONNECT_TOO_MANY_CONNECTIONS                 12
#define SSH_DISCONNECT_AUTH_CANCELLED_BY_USER               13
#define SSH_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE       14
#define SSH_DISCONNECT_ILLEGAL_USER_NAME                    15

/* Error Codes (defined by libssh2) */
#define LIBSSH2_ERROR_NONE                      0

/* The library once used -1 as a generic error return value on numerous places
   through the code, which subsequently was converted to
   LIBSSH2_ERROR_SOCKET_NONE uses over time. As this is a generic error code,
   the goal is to never ever return this code but instead make sure that a
   more accurate and descriptive error code is used. */
#define LIBSSH2_ERROR_SOCKET_NONE               -1

#define LIBSSH2_ERROR_BANNER_RECV               -2
#define LIBSSH2_ERROR_BANNER_SEND               -3
#define LIBSSH2_ERROR_INVALID_MAC               -4
#define LIBSSH2_ERROR_KEX_FAILURE               -5
#define LIBSSH2_ERROR_ALLOC                     -6
#define LIBSSH2_ERROR_SOCKET_SEND               -7
#define LIBSSH2_ERROR_KEY_EXCHANGE_FAILURE      -8
#define LIBSSH2_ERROR_TIMEOUT                   -9
#define LIBSSH2_ERROR_HOSTKEY_INIT              -10
#define LIBSSH2_ERROR_HOSTKEY_SIGN              -11
#define LIBSSH2_ERROR_DECRYPT                   -12
#define LIBSSH2_ERROR_SOCKET_DISCONNECT         -13
#define LIBSSH2_ERROR_PROTO                     -14
#define LIBSSH2_ERROR_PASSWORD_EXPIRED          -15
#define LIBSSH2_ERROR_FILE                      -16
#define LIBSSH2_ERROR_METHOD_NONE               -17
#define LIBSSH2_ERROR_AUTHENTICATION_FAILED     -18
#define LIBSSH2_ERROR_PUBLICKEY_UNRECOGNIZED    LIBSSH2_ERROR_AUTHENTICATION_FAILED
#define LIBSSH2_ERROR_PUBLICKEY_UNVERIFIED      -19
#define LIBSSH2_ERROR_CHANNEL_OUTOFORDER        -20
#define LIBSSH2_ERROR_CHANNEL_FAILURE           -21
#define LIBSSH2_ERROR_CHANNEL_REQUEST_DENIED    -22
#define LIBSSH2_ERROR_CHANNEL_UNKNOWN           -23
#define LIBSSH2_ERROR_CHANNEL_WINDOW_EXCEEDED   -24
#define LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED   -25
#define LIBSSH2_ERROR_CHANNEL_CLOSED            -26
#define LIBSSH2_ERROR_CHANNEL_EOF_SENT          -27
#define LIBSSH2_ERROR_SCP_PROTOCOL              -28
#define LIBSSH2_ERROR_ZLIB                      -29
#define LIBSSH2_ERROR_SOCKET_TIMEOUT            -30
#define LIBSSH2_ERROR_SFTP_PROTOCOL             -31
#define LIBSSH2_ERROR_REQUEST_DENIED            -32
#define LIBSSH2_ERROR_METHOD_NOT_SUPPORTED      -33
#define LIBSSH2_ERROR_INVAL                     -34
#define LIBSSH2_ERROR_INVALID_POLL_TYPE         -35
#define LIBSSH2_ERROR_PUBLICKEY_PROTOCOL        -36
#define LIBSSH2_ERROR_EAGAIN                    -37
#define LIBSSH2_ERROR_BUFFER_TOO_SMALL          -38
#define LIBSSH2_ERROR_BAD_USE                   -39
#define LIBSSH2_ERROR_COMPRESS                  -40
#define LIBSSH2_ERROR_OUT_OF_BOUNDARY           -41
#define LIBSSH2_ERROR_AGENT_PROTOCOL            -42
#define LIBSSH2_ERROR_SOCKET_RECV               -43
#define LIBSSH2_ERROR_ENCRYPT                   -44
#define LIBSSH2_ERROR_BAD_SOCKET                -45
#define LIBSSH2_ERROR_KNOWN_HOSTS               -46

/* this is a define to provide the old (<= 1.2.7) name */
#define LIBSSH2_ERROR_BANNER_NONE LIBSSH2_ERROR_BANNER_RECV

/* Global API */
#define LIBSSH2_INIT_NO_CRYPTO        0x0001

/*
 * libssh2_init()
 *
 * Initialize the libssh2 functions.  This typically initialize the
 * crypto library.  It uses a global state, and is not thread safe --
 * you must make sure this function is not called concurrently.
 *
 * Flags can be:
 * 0:                              Normal initialize
 * LIBSSH2_INIT_NO_CRYPTO:         Do not initialize the crypto library (ie.
 *                                 OPENSSL_add_cipher_algoritms() for OpenSSL
 *
 * Returns 0 if succeeded, or a negative value for error.
 */
LIBSSH2_API int libssh2_init(int flags);

/*
 * libssh2_exit()
 *
 * Exit the libssh2 functions and free's all memory used internal.
 */
LIBSSH2_API void libssh2_exit(void);

/*
 * libssh2_free()
 *
 * Deallocate memory allocated by earlier call to libssh2 functions.
 */
LIBSSH2_API void libssh2_free(LIBSSH2_SESSION *session, void *ptr);

/*
 * libssh2_session_supported_algs()
 *
 * Fills algs with a list of supported acryptographic algorithms. Returns a
 * non-negative number (number of supported algorithms) on success or a
 * negative number (an eror code) on failure.
 *
 * NOTE: on success, algs must be deallocated (by calling libssh2_free) when
 * not needed anymore
 */
LIBSSH2_API int libssh2_session_supported_algs(LIBSSH2_SESSION* session,
                                               int method_type,
                                               const char*** algs);

/* Session API */
LIBSSH2_API LIBSSH2_SESSION *
libssh2_session_init_ex(LIBSSH2_ALLOC_FUNC((*my_alloc)),
                        LIBSSH2_FREE_FUNC((*my_free)),
                        LIBSSH2_REALLOC_FUNC((*my_realloc)), void *abstract);
#define libssh2_session_init() libssh2_session_init_ex(NULL, NULL, NULL, NULL)

LIBSSH2_API void **libssh2_session_abstract(LIBSSH2_SESSION *session);

LIBSSH2_API void *libssh2_session_callback_set(LIBSSH2_SESSION *session,
                                               int cbtype, void *callback);
LIBSSH2_API int libssh2_session_banner_set(LIBSSH2_SESSION *session,
                                           const char *banner);
LIBSSH2_API int libssh2_banner_set(LIBSSH2_SESSION *session,
                                   const char *banner);

LIBSSH2_API int libssh2_session_startup(LIBSSH2_SESSION *session, int sock);
LIBSSH2_API int libssh2_session_handshake(LIBSSH2_SESSION *session,
                                          libssh2_socket_t sock);
LIBSSH2_API int libssh2_session_disconnect_ex(LIBSSH2_SESSION *session,
                                              int reason,
                                              const char *description,
                                              const char *lang);
#define libssh2_session_disconnect(session, description) \
  libssh2_session_disconnect_ex((session), SSH_DISCONNECT_BY_APPLICATION, \
                                (description), "")

LIBSSH2_API int libssh2_session_free(LIBSSH2_SESSION *session);

LIBSSH2_API const char *libssh2_hostkey_hash(LIBSSH2_SESSION *session,
                                             int hash_type);

LIBSSH2_API const char *libssh2_session_hostkey(LIBSSH2_SESSION *session,
                                                size_t *len, int *type);

LIBSSH2_API int libssh2_session_method_pref(LIBSSH2_SESSION *session,
                                            int method_type,
                                            const char *prefs);
LIBSSH2_API const char *libssh2_session_methods(LIBSSH2_SESSION *session,
                                                int method_type);
LIBSSH2_API int libssh2_session_last_error(LIBSSH2_SESSION *session,
                                           char **errmsg,
                                           int *errmsg_len, int want_buf);
LIBSSH2_API int libssh2_session_last_errno(LIBSSH2_SESSION *session);
LIBSSH2_API int libssh2_session_block_directions(LIBSSH2_SESSION *session);

LIBSSH2_API int libssh2_session_flag(LIBSSH2_SESSION *session, int flag,
                                     int value);
LIBSSH2_API const char *libssh2_session_banner_get(LIBSSH2_SESSION *session);

/* Userauth API */
LIBSSH2_API char *libssh2_userauth_list(LIBSSH2_SESSION *session,
                                        const char *username,
                                        unsigned int username_len);
LIBSSH2_API int libssh2_userauth_authenticated(LIBSSH2_SESSION *session);

LIBSSH2_API int libssh2_userauth_password_ex(LIBSSH2_SESSION *session,
                                             const char *username,
                                             unsigned int username_len,
                                             const char *password,
                                             unsigned int password_len,
                                             LIBSSH2_PASSWD_CHANGEREQ_FUNC((*passwd_change_cb)));

#define libssh2_userauth_password(session, username, password) \
 libssh2_userauth_password_ex((session), (username),           \
                              (unsigned int)strlen(username),  \
                              (password), (unsigned int)strlen(password), NULL)

LIBSSH2_API int
libssh2_userauth_publickey_fromfile_ex(LIBSSH2_SESSION *session,
                                       const char *username,
                                       unsigned int username_len,
                                       const char *publickey,
                                       const char *privatekey,
                                       const char *passphrase);

#define libssh2_userauth_publickey_fromfile(session, username, publickey, \
                                            privatekey, passphrase)     \
    libssh2_userauth_publickey_fromfile_ex((session), (username),       \
                                           (unsigned int)strlen(username), \
                                           (publickey),                 \
                                           (privatekey), (passphrase))

LIBSSH2_API int
libssh2_userauth_publickey(LIBSSH2_SESSION *session,
                           const char *username,
                           const unsigned char *pubkeydata,
                           size_t pubkeydata_len,
                           LIBSSH2_USERAUTH_PUBLICKEY_SIGN_FUNC((*sign_callback)),
                           void **abstract);

LIBSSH2_API int
libssh2_userauth_hostbased_fromfile_ex(LIBSSH2_SESSION *session,
                                       const char *username,
                                       unsigned int username_len,
                                       const char *publickey,
                                       const char *privatekey,
                                       const char *passphrase,
                                       const char *hostname,
                                       unsigned int hostname_len,
                                       const char *local_username,
                                       unsigned int local_username_len);

#define libssh2_userauth_hostbased_fromfile(session, username, publickey, \
                                            privatekey, passphrase, hostname) \
 libssh2_userauth_hostbased_fromfile_ex((session), (username), \
                                        (unsigned int)strlen(username), \
                                        (publickey),                    \
                                        (privatekey), (passphrase),     \
                                        (hostname),                     \
                                        (unsigned int)strlen(hostname), \
                                        (username),                     \
                                        (unsigned int)strlen(username))

/*
 * response_callback is provided with filled by library prompts array,
 * but client must allocate and fill individual responses. Responses
 * array is already allocated. Responses data will be freed by libssh2
 * after callback return, but before subsequent callback invokation.
 */
LIBSSH2_API int
libssh2_userauth_keyboard_interactive_ex(LIBSSH2_SESSION* session,
                                         const char *username,
                                         unsigned int username_len,
                                         LIBSSH2_USERAUTH_KBDINT_RESPONSE_FUNC((*response_callback)));

#define libssh2_userauth_keyboard_interactive(session, username,        \
                                              response_callback)        \
    libssh2_userauth_keyboard_interactive_ex((session), (username),     \
                                             (unsigned int)strlen(username), \
                                             (response_callback))

LIBSSH2_API int libssh2_poll(LIBSSH2_POLLFD *fds, unsigned int nfds,
                             long timeout);

/* Channel API */
#define LIBSSH2_CHANNEL_WINDOW_DEFAULT  (2*1024*1024)
#define LIBSSH2_CHANNEL_PACKET_DEFAULT  32768
#define LIBSSH2_CHANNEL_MINADJUST       1024

/* Extended Data Handling */
#define LIBSSH2_CHANNEL_EXTENDED_DATA_NORMAL        0
#define LIBSSH2_CHANNEL_EXTENDED_DATA_IGNORE        1
#define LIBSSH2_CHANNEL_EXTENDED_DATA_MERGE         2

#define SSH_EXTENDED_DATA_STDERR 1

/* Returned by any function that would block during a read/write opperation */
#define LIBSSH2CHANNEL_EAGAIN LIBSSH2_ERROR_EAGAIN

LIBSSH2_API LIBSSH2_CHANNEL *
libssh2_channel_open_ex(LIBSSH2_SESSION *session, const char *channel_type,
                        unsigned int channel_type_len,
                        unsigned int window_size, unsigned int packet_size,
                        const char *message, unsigned int message_len);

#define libssh2_channel_open_session(session) \
  libssh2_channel_open_ex((session), "session", sizeof("session") - 1, \
                          LIBSSH2_CHANNEL_WINDOW_DEFAULT, \
                          LIBSSH2_CHANNEL_PACKET_DEFAULT, NULL, 0)

LIBSSH2_API LIBSSH2_CHANNEL *
libssh2_channel_direct_tcpip_ex(LIBSSH2_SESSION *session, const char *host,
                                int port, const char *shost, int sport);
#define libssh2_channel_direct_tcpip(session, host, port) \
  libssh2_channel_direct_tcpip_ex((session), (host), (port), "127.0.0.1", 22)

LIBSSH2_API LIBSSH2_LISTENER *
libssh2_channel_forward_listen_ex(LIBSSH2_SESSION *session, const char *host,
                                  int port, int *bound_port, int queue_maxsize);
#define libssh2_channel_forward_listen(session, port) \
 libssh2_channel_forward_listen_ex((session), NULL, (port), NULL, 16)

LIBSSH2_API int libssh2_channel_forward_cancel(LIBSSH2_LISTENER *listener);

LIBSSH2_API LIBSSH2_CHANNEL *
libssh2_channel_forward_accept(LIBSSH2_LISTENER *listener);

LIBSSH2_API int libssh2_channel_setenv_ex(LIBSSH2_CHANNEL *channel,
                                          const char *varname,
                                          unsigned int varname_len,
                                          const char *value,
                                          unsigned int value_len);

#define libssh2_channel_setenv(channel, varname, value)                 \
    libssh2_channel_setenv_ex((channel), (varname),                     \
                              (unsigned int)strlen(varname), (value),   \
                              (unsigned int)strlen(value))

LIBSSH2_API int libssh2_channel_request_pty_ex(LIBSSH2_CHANNEL *channel,
                                               const char *term,
                                               unsigned int term_len,
                                               const char *modes,
                                               unsigned int modes_len,
                                               int width, int height,
                                               int width_px, int height_px);
#define libssh2_channel_request_pty(channel, term)                      \
    libssh2_channel_request_pty_ex((channel), (term),                   \
                                   (unsigned int)strlen(term),          \
                                   NULL, 0,                             \
                                   LIBSSH2_TERM_WIDTH, LIBSSH2_TERM_HEIGHT, \
                                   LIBSSH2_TERM_WIDTH_PX, LIBSSH2_TERM_HEIGHT_PX)

LIBSSH2_API int libssh2_channel_request_pty_size_ex(LIBSSH2_CHANNEL *channel,
                                                    int width, int height,
                                                    int width_px,
                                                    int height_px);
#define libssh2_channel_request_pty_size(channel, width, height) \
  libssh2_channel_request_pty_size_ex( (channel), (width), (height), 0, 0)

LIBSSH2_API int libssh2_channel_x11_req_ex(LIBSSH2_CHANNEL *channel,
                                           int single_connection,
                                           const char *auth_proto,
                                           const char *auth_cookie,
                                           int screen_number);
#define libssh2_channel_x11_req(channel, screen_number) \
 libssh2_channel_x11_req_ex((channel), 0, NULL, NULL, (screen_number))

LIBSSH2_API int libssh2_channel_process_startup(LIBSSH2_CHANNEL *channel,
                                                const char *request,
                                                unsigned int request_len,
                                                const char *message,
                                                unsigned int message_len);
#define libssh2_channel_shell(channel) \
  libssh2_channel_process_startup((channel), "shell", sizeof("shell") - 1, \
                                  NULL, 0)
#define libssh2_channel_exec(channel, command) \
  libssh2_channel_process_startup((channel), "exec", sizeof("exec") - 1, \
                                  (command), (unsigned int)strlen(command))
#define libssh2_channel_subsystem(channel, subsystem) \
  libssh2_channel_process_startup((channel), "subsystem",              \
                                  sizeof("subsystem") - 1, (subsystem), \
                                  (unsigned int)strlen(subsystem))

LIBSSH2_API ssize_t libssh2_channel_read_ex(LIBSSH2_CHANNEL *channel,
                                            int stream_id, char *buf,
                                            size_t buflen);
#define libssh2_channel_read(channel, buf, buflen) \
  libssh2_channel_read_ex((channel), 0, (buf), (buflen))
#define libssh2_channel_read_stderr(channel, buf, buflen) \
  libssh2_channel_read_ex((channel), SSH_EXTENDED_DATA_STDERR, (buf), (buflen))

LIBSSH2_API int libssh2_poll_channel_read(LIBSSH2_CHANNEL *channel,
                                          int extended);

LIBSSH2_API unsigned long
libssh2_channel_window_read_ex(LIBSSH2_CHANNEL *channel,
                               unsigned long *read_avail,
                               unsigned long *window_size_initial);
#define libssh2_channel_window_read(channel) \
  libssh2_channel_window_read_ex((channel), NULL, NULL)

/* libssh2_channel_receive_window_adjust is DEPRECATED, do not use! */
LIBSSH2_API unsigned long
libssh2_channel_receive_window_adjust(LIBSSH2_CHANNEL *channel,
                                      unsigned long adjustment,
                                      unsigned char force);

LIBSSH2_API int
libssh2_channel_receive_window_adjust2(LIBSSH2_CHANNEL *channel,
                                       unsigned long adjustment,
                                       unsigned char force,
                                       unsigned int *storewindow);

LIBSSH2_API ssize_t libssh2_channel_write_ex(LIBSSH2_CHANNEL *channel,
                                             int stream_id, const char *buf,
                                             size_t buflen);

#define libssh2_channel_write(channel, buf, buflen) \
  libssh2_channel_write_ex((channel), 0, (buf), (buflen))
#define libssh2_channel_write_stderr(channel, buf, buflen)  \
  libssh2_channel_write_ex((channel), SSH_EXTENDED_DATA_STDERR, (buf), (buflen))

LIBSSH2_API unsigned long
libssh2_channel_window_write_ex(LIBSSH2_CHANNEL *channel,
                                unsigned long *window_size_initial);
#define libssh2_channel_window_write(channel) \
  libssh2_channel_window_write_ex((channel), NULL)

LIBSSH2_API void libssh2_session_set_blocking(LIBSSH2_SESSION* session,
                                              int blocking);
LIBSSH2_API int libssh2_session_get_blocking(LIBSSH2_SESSION* session);

LIBSSH2_API void libssh2_channel_set_blocking(LIBSSH2_CHANNEL *channel,
                                              int blocking);

LIBSSH2_API void libssh2_session_set_timeout(LIBSSH2_SESSION* session,
                                             long timeout);
LIBSSH2_API long libssh2_session_get_timeout(LIBSSH2_SESSION* session);

/* libssh2_channel_handle_extended_data is DEPRECATED, do not use! */
LIBSSH2_API void libssh2_channel_handle_extended_data(LIBSSH2_CHANNEL *channel,
                                                      int ignore_mode);
LIBSSH2_API int libssh2_channel_handle_extended_data2(LIBSSH2_CHANNEL *channel,
                                                      int ignore_mode);

/* libssh2_channel_ignore_extended_data() is defined below for BC with version
 * 0.1
 *
 * Future uses should use libssh2_channel_handle_extended_data() directly if
 * LIBSSH2_CHANNEL_EXTENDED_DATA_MERGE is passed, extended data will be read
 * (FIFO) from the standard data channel
 */
/* DEPRECATED */
#define libssh2_channel_ignore_extended_data(channel, ignore) \
  libssh2_channel_handle_extended_data((channel),                       \
                                       (ignore) ?                       \
                                       LIBSSH2_CHANNEL_EXTENDED_DATA_IGNORE : \
                                       LIBSSH2_CHANNEL_EXTENDED_DATA_NORMAL )

#define LIBSSH2_CHANNEL_FLUSH_EXTENDED_DATA     -1
#define LIBSSH2_CHANNEL_FLUSH_ALL               -2
LIBSSH2_API int libssh2_channel_flush_ex(LIBSSH2_CHANNEL *channel,
                                         int streamid);
#define libssh2_channel_flush(channel) libssh2_channel_flush_ex((channel), 0)
#define libssh2_channel_flush_stderr(channel) \
 libssh2_channel_flush_ex((channel), SSH_EXTENDED_DATA_STDERR)

LIBSSH2_API int libssh2_channel_get_exit_status(LIBSSH2_CHANNEL* channel);
LIBSSH2_API int libssh2_channel_get_exit_signal(LIBSSH2_CHANNEL* channel,
                                                char **exitsignal,
                                                size_t *exitsignal_len,
                                                char **errmsg,
                                                size_t *errmsg_len,
                                                char **langtag,
                                                size_t *langtag_len);
LIBSSH2_API int libssh2_channel_send_eof(LIBSSH2_CHANNEL *channel);
LIBSSH2_API int libssh2_channel_eof(LIBSSH2_CHANNEL *channel);
LIBSSH2_API int libssh2_channel_wait_eof(LIBSSH2_CHANNEL *channel);
LIBSSH2_API int libssh2_channel_close(LIBSSH2_CHANNEL *channel);
LIBSSH2_API int libssh2_channel_wait_closed(LIBSSH2_CHANNEL *channel);
LIBSSH2_API int libssh2_channel_free(LIBSSH2_CHANNEL *channel);

LIBSSH2_API LIBSSH2_CHANNEL *libssh2_scp_recv(LIBSSH2_SESSION *session,
                                              const char *path,
                                              struct stat *sb);
LIBSSH2_API LIBSSH2_CHANNEL *libssh2_scp_send_ex(LIBSSH2_SESSION *session,
                                                 const char *path, int mode,
                                                 size_t size, long mtime,
                                                 long atime);
LIBSSH2_API LIBSSH2_CHANNEL *
libssh2_scp_send64(LIBSSH2_SESSION *session, const char *path, int mode,
                   libssh2_int64_t size, time_t mtime, time_t atime);

#define libssh2_scp_send(session, path, mode, size) \
  libssh2_scp_send_ex((session), (path), (mode), (size), 0, 0)

LIBSSH2_API int libssh2_base64_decode(LIBSSH2_SESSION *session, char **dest,
                                      unsigned int *dest_len,
                                      const char *src, unsigned int src_len);

LIBSSH2_API
const char *libssh2_version(int req_version_num);

#define HAVE_LIBSSH2_KNOWNHOST_API 0x010101 /* since 1.1.1 */
#define HAVE_LIBSSH2_VERSION_API   0x010100 /* libssh2_version since 1.1 */

struct libssh2_knownhost {
    unsigned int magic;  /* magic stored by the library */
    void *node; /* handle to the internal representation of this host */
    char *name; /* this is NULL if no plain text host name exists */
    char *key;  /* key in base64/printable format */
    int typemask;
};

/*
 * libssh2_knownhost_init
 *
 * Init a collection of known hosts. Returns the pointer to a collection.
 *
 */
LIBSSH2_API LIBSSH2_KNOWNHOSTS *
libssh2_knownhost_init(LIBSSH2_SESSION *session);

/*
 * libssh2_knownhost_add
 *
 * Add a host and its associated key to the collection of known hosts.
 *
 * The 'type' argument specifies on what format the given host and keys are:
 *
 * plain  - ascii "hostname.domain.tld"
 * sha1   - SHA1(<salt> <host>) base64-encoded!
 * custom - another hash
 *
 * If 'sha1' is selected as type, the salt must be provided to the salt
 * argument. This too base64 encoded.
 *
 * The SHA-1 hash is what OpenSSH can be told to use in known_hosts files.  If
 * a custom type is used, salt is ignored and you must provide the host
 * pre-hashed when checking for it in the libssh2_knownhost_check() function.
 *
 * The keylen parameter may be omitted (zero) if the key is provided as a
 * NULL-terminated base64-encoded string.
 */

/* host format (2 bits) */
#define LIBSSH2_KNOWNHOST_TYPE_MASK    0xffff
#define LIBSSH2_KNOWNHOST_TYPE_PLAIN   1
#define LIBSSH2_KNOWNHOST_TYPE_SHA1    2 /* always base64 encoded */
#define LIBSSH2_KNOWNHOST_TYPE_CUSTOM  3

/* key format (2 bits) */
#define LIBSSH2_KNOWNHOST_KEYENC_MASK     (3<<16)
#define LIBSSH2_KNOWNHOST_KEYENC_RAW      (1<<16)
#define LIBSSH2_KNOWNHOST_KEYENC_BASE64   (2<<16)

/* type of key (2 bits) */
#define LIBSSH2_KNOWNHOST_KEY_MASK     (7<<18)
#define LIBSSH2_KNOWNHOST_KEY_SHIFT    18
#define LIBSSH2_KNOWNHOST_KEY_RSA1     (1<<18)
#define LIBSSH2_KNOWNHOST_KEY_SSHRSA   (2<<18)
#define LIBSSH2_KNOWNHOST_KEY_SSHDSS   (3<<18)
#define LIBSSH2_KNOWNHOST_KEY_UNKNOWN  (7<<18)

LIBSSH2_API int
libssh2_knownhost_add(LIBSSH2_KNOWNHOSTS *hosts,
                      const char *host,
                      const char *salt,
                      const char *key, size_t keylen, int typemask,
                      struct libssh2_knownhost **store);

/*
 * libssh2_knownhost_addc
 *
 * Add a host and its associated key to the collection of known hosts.
 *
 * Takes a comment argument that may be NULL.  A NULL comment indicates
 * there is no comment and the entry will end directly after the key
 * when written out to a file.  An empty string "" comment will indicate an
 * empty comment which will cause a single space to be written after the key.
 *
 * The 'type' argument specifies on what format the given host and keys are:
 *
 * plain  - ascii "hostname.domain.tld"
 * sha1   - SHA1(<salt> <host>) base64-encoded!
 * custom - another hash
 *
 * If 'sha1' is selected as type, the salt must be provided to the salt
 * argument. This too base64 encoded.
 *
 * The SHA-1 hash is what OpenSSH can be told to use in known_hosts files.  If
 * a custom type is used, salt is ignored and you must provide the host
 * pre-hashed when checking for it in the libssh2_knownhost_check() function.
 *
 * The keylen parameter may be omitted (zero) if the key is provided as a
 * NULL-terminated base64-encoded string.
 */

LIBSSH2_API int
libssh2_knownhost_addc(LIBSSH2_KNOWNHOSTS *hosts,
                       const char *host,
                       const char *salt,
                       const char *key, size_t keylen,
                       const char *comment, size_t commentlen, int typemask,
                       struct libssh2_knownhost **store);

/*
 * libssh2_knownhost_check
 *
 * Check a host and its associated key against the collection of known hosts.
 *
 * The type is the type/format of the given host name.
 *
 * plain  - ascii "hostname.domain.tld"
 * custom - prehashed base64 encoded. Note that this cannot use any salts.
 *
 *
 * 'knownhost' may be set to NULL if you don't care about that info.
 *
 * Returns:
 *
 * LIBSSH2_KNOWNHOST_CHECK_* values, see below
 *
 */

#define LIBSSH2_KNOWNHOST_CHECK_MATCH    0
#define LIBSSH2_KNOWNHOST_CHECK_MISMATCH 1
#define LIBSSH2_KNOWNHOST_CHECK_NOTFOUND 2
#define LIBSSH2_KNOWNHOST_CHECK_FAILURE  3

LIBSSH2_API int
libssh2_knownhost_check(LIBSSH2_KNOWNHOSTS *hosts,
                        const char *host, const char *key, size_t keylen,
                        int typemask,
                        struct libssh2_knownhost **knownhost);

/* this function is identital to the above one, but also takes a port
   argument that allows libssh2 to do a better check */
LIBSSH2_API int
libssh2_knownhost_checkp(LIBSSH2_KNOWNHOSTS *hosts,
                         const char *host, int port,
                         const char *key, size_t keylen,
                         int typemask,
                         struct libssh2_knownhost **knownhost);

/*
 * libssh2_knownhost_del
 *
 * Remove a host from the collection of known hosts. The 'entry' struct is
 * retrieved by a call to libssh2_knownhost_check().
 *
 */
LIBSSH2_API int
libssh2_knownhost_del(LIBSSH2_KNOWNHOSTS *hosts,
                      struct libssh2_knownhost *entry);

/*
 * libssh2_knownhost_free
 *
 * Free an entire collection of known hosts.
 *
 */
LIBSSH2_API void
libssh2_knownhost_free(LIBSSH2_KNOWNHOSTS *hosts);

/*
 * libssh2_knownhost_readline()
 *
 * Pass in a line of a file of 'type'. It makes libssh2 read this line.
 *
 * LIBSSH2_KNOWNHOST_FILE_OPENSSH is the only supported type.
 *
 */
LIBSSH2_API int
libssh2_knownhost_readline(LIBSSH2_KNOWNHOSTS *hosts,
                           const char *line, size_t len, int type);

/*
 * libssh2_knownhost_readfile
 *
 * Add hosts+key pairs from a given file.
 *
 * Returns a negative value for error or number of successfully added hosts.
 *
 * This implementation currently only knows one 'type' (openssh), all others
 * are reserved for future use.
 */

#define LIBSSH2_KNOWNHOST_FILE_OPENSSH 1

LIBSSH2_API int
libssh2_knownhost_readfile(LIBSSH2_KNOWNHOSTS *hosts,
                           const char *filename, int type);

/*
 * libssh2_knownhost_writeline()
 *
 * Ask libssh2 to convert a known host to an output line for storage.
 *
 * Note that this function returns LIBSSH2_ERROR_BUFFER_TOO_SMALL if the given
 * output buffer is too small to hold the desired output.
 *
 * This implementation currently only knows one 'type' (openssh), all others
 * are reserved for future use.
 *
 */
LIBSSH2_API int
libssh2_knownhost_writeline(LIBSSH2_KNOWNHOSTS *hosts,
                            struct libssh2_knownhost *known,
                            char *buffer, size_t buflen,
                            size_t *outlen, /* the amount of written data */
                            int type);

/*
 * libssh2_knownhost_writefile
 *
 * Write hosts+key pairs to a given file.
 *
 * This implementation currently only knows one 'type' (openssh), all others
 * are reserved for future use.
 */

LIBSSH2_API int
libssh2_knownhost_writefile(LIBSSH2_KNOWNHOSTS *hosts,
                            const char *filename, int type);

/*
 * libssh2_knownhost_get()
 *
 * Traverse the internal list of known hosts. Pass NULL to 'prev' to get
 * the first one. Or pass a poiner to the previously returned one to get the
 * next.
 *
 * Returns:
 * 0 if a fine host was stored in 'store'
 * 1 if end of hosts
 * [negative] on errors
 */
LIBSSH2_API int
libssh2_knownhost_get(LIBSSH2_KNOWNHOSTS *hosts,
                      struct libssh2_knownhost **store,
                      struct libssh2_knownhost *prev);

#define HAVE_LIBSSH2_AGENT_API 0x010202 /* since 1.2.2 */

struct libssh2_agent_publickey {
    unsigned int magic;              /* magic stored by the library */
    void *node;     /* handle to the internal representation of key */
    unsigned char *blob;           /* public key blob */
    size_t blob_len;               /* length of the public key blob */
    char *comment;                 /* comment in printable format */
};

/*
 * libssh2_agent_init
 *
 * Init an ssh-agent handle. Returns the pointer to the handle.
 *
 */
LIBSSH2_API LIBSSH2_AGENT *
libssh2_agent_init(LIBSSH2_SESSION *session);

/*
 * libssh2_agent_connect()
 *
 * Connect to an ssh-agent.
 *
 * Returns 0 if succeeded, or a negative value for error.
 */
LIBSSH2_API int
libssh2_agent_connect(LIBSSH2_AGENT *agent);

/*
 * libssh2_agent_list_identities()
 *
 * Request an ssh-agent to list identities.
 *
 * Returns 0 if succeeded, or a negative value for error.
 */
LIBSSH2_API int
libssh2_agent_list_identities(LIBSSH2_AGENT *agent);

/*
 * libssh2_agent_get_identity()
 *
 * Traverse the internal list of public keys. Pass NULL to 'prev' to get
 * the first one. Or pass a poiner to the previously returned one to get the
 * next.
 *
 * Returns:
 * 0 if a fine public key was stored in 'store'
 * 1 if end of public keys
 * [negative] on errors
 */
LIBSSH2_API int
libssh2_agent_get_identity(LIBSSH2_AGENT *agent,
               struct libssh2_agent_publickey **store,
               struct libssh2_agent_publickey *prev);

/*
 * libssh2_agent_userauth()
 *
 * Do publickey user authentication with the help of ssh-agent.
 *
 * Returns 0 if succeeded, or a negative value for error.
 */
LIBSSH2_API int
libssh2_agent_userauth(LIBSSH2_AGENT *agent,
               const char *username,
               struct libssh2_agent_publickey *identity);

/*
 * libssh2_agent_disconnect()
 *
 * Close a connection to an ssh-agent.
 *
 * Returns 0 if succeeded, or a negative value for error.
 */
LIBSSH2_API int
libssh2_agent_disconnect(LIBSSH2_AGENT *agent);

/*
 * libssh2_agent_free()
 *
 * Free an ssh-agent handle.  This function also frees the internal
 * collection of public keys.
 */
LIBSSH2_API void
libssh2_agent_free(LIBSSH2_AGENT *agent);


/*
 * libssh2_keepalive_config()
 *
 * Set how often keepalive messages should be sent.  WANT_REPLY
 * indicates whether the keepalive messages should request a response
 * from the server.  INTERVAL is number of seconds that can pass
 * without any I/O, use 0 (the default) to disable keepalives.  To
 * avoid some busy-loop corner-cases, if you specify an interval of 1
 * it will be treated as 2.
 *
 * Note that non-blocking applications are responsible for sending the
 * keepalive messages using libssh2_keepalive_send().
 */
LIBSSH2_API void libssh2_keepalive_config (LIBSSH2_SESSION *session,
                                           int want_reply,
                                           unsigned interval);

/*
 * libssh2_keepalive_send()
 *
 * Send a keepalive message if needed.  SECONDS_TO_NEXT indicates how
 * many seconds you can sleep after this call before you need to call
 * it again.  Returns 0 on success, or LIBSSH2_ERROR_SOCKET_SEND on
 * I/O errors.
 */
LIBSSH2_API int libssh2_keepalive_send (LIBSSH2_SESSION *session,
                                        int *seconds_to_next);

/* NOTE NOTE NOTE
   libssh2_trace() has no function in builds that aren't built with debug
   enabled
 */
LIBSSH2_API int libssh2_trace(LIBSSH2_SESSION *session, int bitmask);
#define LIBSSH2_TRACE_TRANS (1<<1)
#define LIBSSH2_TRACE_KEX   (1<<2)
#define LIBSSH2_TRACE_AUTH  (1<<3)
#define LIBSSH2_TRACE_CONN  (1<<4)
#define LIBSSH2_TRACE_SCP   (1<<5)
#define LIBSSH2_TRACE_SFTP  (1<<6)
#define LIBSSH2_TRACE_ERROR (1<<7)
#define LIBSSH2_TRACE_PUBLICKEY (1<<8)
#define LIBSSH2_TRACE_SOCKET (1<<9)

typedef void (*libssh2_trace_handler_func)(LIBSSH2_SESSION*,
                                           void*,
                                           const char *,
                                           size_t);
LIBSSH2_API int libssh2_trace_sethandler(LIBSSH2_SESSION *session,
                                         void* context,
                                         libssh2_trace_handler_func callback);

#ifdef __cplusplus
} /* extern "C" */
#endif

#endif /* !RC_INVOKED */

#endif /* LIBSSH2_H */