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+/* $OpenBSD: ssh2.h,v 1.18 2016/05/04 14:22:33 markus Exp $ */
+
+/*
+ * Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+/*
+ * draft-ietf-secsh-architecture-05.txt
+ *
+ * Transport layer protocol:
+ *
+ * 1-19 Transport layer generic (e.g. disconnect, ignore, debug,
+ * etc)
+ * 20-29 Algorithm negotiation
+ * 30-49 Key exchange method specific (numbers can be reused for
+ * different authentication methods)
+ *
+ * User authentication protocol:
+ *
+ * 50-59 User authentication generic
+ * 60-79 User authentication method specific (numbers can be reused
+ * for different authentication methods)
+ *
+ * Connection protocol:
+ *
+ * 80-89 Connection protocol generic
+ * 90-127 Channel related messages
+ *
+ * Reserved for client protocols:
+ *
+ * 128-191 Reserved
+ *
+ * Local extensions:
+ *
+ * 192-255 Local extensions
+ */
+
+/* special marker for no message */
+
+#define SSH_MSG_NONE 0
+
+/* ranges */
+
+#define SSH2_MSG_TRANSPORT_MIN 1
+#define SSH2_MSG_TRANSPORT_MAX 49
+#define SSH2_MSG_USERAUTH_MIN 50
+#define SSH2_MSG_USERAUTH_MAX 79
+#define SSH2_MSG_USERAUTH_PER_METHOD_MIN 60
+#define SSH2_MSG_USERAUTH_PER_METHOD_MAX SSH2_MSG_USERAUTH_MAX
+#define SSH2_MSG_CONNECTION_MIN 80
+#define SSH2_MSG_CONNECTION_MAX 127
+#define SSH2_MSG_RESERVED_MIN 128
+#define SSH2_MSG_RESERVED_MAX 191
+#define SSH2_MSG_LOCAL_MIN 192
+#define SSH2_MSG_LOCAL_MAX 255
+#define SSH2_MSG_MIN 1
+#define SSH2_MSG_MAX 255
+
+/* transport layer: generic */
+
+#define SSH2_MSG_DISCONNECT 1
+#define SSH2_MSG_IGNORE 2
+#define SSH2_MSG_UNIMPLEMENTED 3
+#define SSH2_MSG_DEBUG 4
+#define SSH2_MSG_SERVICE_REQUEST 5
+#define SSH2_MSG_SERVICE_ACCEPT 6
+#define SSH2_MSG_EXT_INFO 7
+
+/* transport layer: alg negotiation */
+
+#define SSH2_MSG_KEXINIT 20
+#define SSH2_MSG_NEWKEYS 21
+
+/* transport layer: kex specific messages, can be reused */
+
+#define SSH2_MSG_KEXDH_INIT 30
+#define SSH2_MSG_KEXDH_REPLY 31
+
+/* dh-group-exchange */
+#define SSH2_MSG_KEX_DH_GEX_REQUEST_OLD 30
+#define SSH2_MSG_KEX_DH_GEX_GROUP 31
+#define SSH2_MSG_KEX_DH_GEX_INIT 32
+#define SSH2_MSG_KEX_DH_GEX_REPLY 33
+#define SSH2_MSG_KEX_DH_GEX_REQUEST 34
+
+/* ecdh */
+#define SSH2_MSG_KEX_ECDH_INIT 30
+#define SSH2_MSG_KEX_ECDH_REPLY 31
+
+/* user authentication: generic */
+
+#define SSH2_MSG_USERAUTH_REQUEST 50
+#define SSH2_MSG_USERAUTH_FAILURE 51
+#define SSH2_MSG_USERAUTH_SUCCESS 52
+#define SSH2_MSG_USERAUTH_BANNER 53
+
+/* user authentication: method specific, can be reused */
+
+#define SSH2_MSG_USERAUTH_PK_OK 60
+#define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60
+#define SSH2_MSG_USERAUTH_INFO_REQUEST 60
+#define SSH2_MSG_USERAUTH_INFO_RESPONSE 61
+
+/* connection protocol: generic */
+
+#define SSH2_MSG_GLOBAL_REQUEST 80
+#define SSH2_MSG_REQUEST_SUCCESS 81
+#define SSH2_MSG_REQUEST_FAILURE 82
+
+/* channel related messages */
+
+#define SSH2_MSG_CHANNEL_OPEN 90
+#define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91
+#define SSH2_MSG_CHANNEL_OPEN_FAILURE 92
+#define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93
+#define SSH2_MSG_CHANNEL_DATA 94
+#define SSH2_MSG_CHANNEL_EXTENDED_DATA 95
+#define SSH2_MSG_CHANNEL_EOF 96
+#define SSH2_MSG_CHANNEL_CLOSE 97
+#define SSH2_MSG_CHANNEL_REQUEST 98
+#define SSH2_MSG_CHANNEL_SUCCESS 99
+#define SSH2_MSG_CHANNEL_FAILURE 100
+
+/* disconnect reason code */
+
+#define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1
+#define SSH2_DISCONNECT_PROTOCOL_ERROR 2
+#define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3
+#define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4
+#define SSH2_DISCONNECT_RESERVED 4
+#define SSH2_DISCONNECT_MAC_ERROR 5
+#define SSH2_DISCONNECT_COMPRESSION_ERROR 6
+#define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7
+#define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8
+#define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9
+#define SSH2_DISCONNECT_CONNECTION_LOST 10
+#define SSH2_DISCONNECT_BY_APPLICATION 11
+#define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS 12
+#define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER 13
+#define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE 14
+#define SSH2_DISCONNECT_ILLEGAL_USER_NAME 15
+
+/* misc */
+
+#define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1
+#define SSH2_OPEN_CONNECT_FAILED 2
+#define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3
+#define SSH2_OPEN_RESOURCE_SHORTAGE 4
+
+#define SSH2_EXTENDED_DATA_STDERR 1
+
+/* Certificate types for OpenSSH certificate keys extension */
+#define SSH2_CERT_TYPE_USER 1
+#define SSH2_CERT_TYPE_HOST 2