/* packet-uftp4.c

 * Routines for UFTP version 4 packet dissection

 * Copyright Dennis Bush <bush@tcnj.edu>

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

*/

#include "config.h"

#include <epan/packet.h>

#include <epan/expert.h>

#include <math.h>

#define UFTP_VER_NUM 0x40

#define ANNOUNCE       1

#define REGISTER       2

#define CLIENT_KEY     3

#define REG_CONF       4

#define KEYINFO        5

#define KEYINFO_ACK    6

#define FILEINFO       7

#define FILEINFO_ACK   8

#define FILESEG        9

#define DONE          10

#define STATUS        11

#define COMPLETE      12

#define DONE_CONF     13

#define HB_REQ        14

#define HB_RESP       15

#define KEY_REQ       16

#define PROXY_KEY     17

#define ENCRYPTED     18

#define ABORT         19

#define CONG_CTRL     20

#define CC_ACK        21

#define FTYPE_REG   0

#define FTYPE_DIR   1

#define FTYPE_LINK  2

#define FTYPE_DELETE    3

#define FTYPE_FREESPACE 4

#define KEY_NONE        0

#define KEY_DES         1

#define KEY_DES_EDE3    2

#define KEY_AES128_CBC  3

#define KEY_AES256_CBC  4

#define KEY_AES128_GCM  5

#define KEY_AES256_GCM  6

#define KEY_AES128_CCM  7

#define KEY_AES256_CCM  8

#define HASH_NONE   0

#define HASH_MD5    1

#define HASH_SHA1   2

#define HASH_SHA256 3

#define HASH_SHA384 4

#define HASH_SHA512 5

#define SIG_NONE    0

#define SIG_HMAC    1

#define SIG_KEYEX   2

#define SIG_AUTHENC 3

#define KEYEX_NONE          0

#define KEYEX_RSA           1

#define KEYEX_ECDH_RSA      2

#define KEYEX_ECDH_ECDSA    3

#define KEYBLOB_RSA     1

#define KEYBLOB_EC      2

#define CURVE_sect163k1     1

#define CURVE_sect163r1     2

#define CURVE_sect163r2     3

#define CURVE_sect193r1     4

#define CURVE_sect193r2     5

#define CURVE_sect233k1     6

#define CURVE_sect233r1     7

#define CURVE_sect239k1     8

#define CURVE_sect283k1     9

#define CURVE_sect283r1     10

#define CURVE_sect409k1     11

#define CURVE_sect409r1     12

#define CURVE_sect571k1     13

#define CURVE_sect571r1     14

#define CURVE_secp160k1     15

#define CURVE_secp160r1     16

#define CURVE_secp160r2     17

#define CURVE_secp192k1     18

#define CURVE_secp192r1     19

#define CURVE_secp224k1     20

#define CURVE_secp224r1     21

#define CURVE_secp256k1     22

#define CURVE_secp256r1     23

#define CURVE_secp384r1     24

#define CURVE_secp521r1     25

#define CURVE_prime192v1    CURVE_secp192r1

#define CURVE_prime256v1    CURVE_secp256r1

#define CC_NONE     0

#define CC_UFTP3    1

#define CC_TFMCC    2

#define CC_PGMCC    3

#define EXT_ENC_INFO        1

#define EXT_TFMCC_DATA_INFO 2

#define EXT_TFMCC_ACK_INFO  3

#define EXT_PGMCC_DATA_INFO 4

#define EXT_PGMCC_NAK_INFO  5

#define EXT_PGMCC_ACK_INFO  6

#define EXT_FREESPACE_INFO 7

#define FLAG_SYNC_MODE      0x01

#define FLAG_SYNC_PREVIEW   0x02

#define FLAG_IPV6           0x04

#define FLAG_ANNOUNCE_RESERVED 0xF8

#define FLAG_CLIENT_AUTH    0x01

#define FLAG_ENCINFO_RESERVED 0xFE

#define FLAG_PARTIAL        0x01

#define FLAG_FILEINFOACK_RESERVED 0xFE

#define FLAG_CURRENT_FILE   0x01

#define FLAG_ABORT_RESERVED 0xFE

#define FLAG_CC_CLR         0x01

#define FLAG_CC_RTT         0x02

#define FLAG_CC_START       0x04

#define FLAG_CC_LEAVE       0x08

#define FLAG_CC_RESERVED    0xF0

#define COMP_STAT_NORMAL    0

#define COMP_STAT_SKIPPED   1

#define COMP_STAT_OVERWRITE 2

#define COMP_STAT_REJECTED  3

#define HB_AUTH_FAILED      0

#define HB_AUTH_OK          1

#define HB_AUTH_CHALLENGE   2

#define MAXFILENAME 100

#define MAXDIRNAME 200

#define MAXPATHNAME 300

#define MAXBACKUPPATHNAME 600

#define MAXPROXYDEST 1000

#define MAXDIR 10

#define MAXSECTION 65536

#define DESTNAME_LEN 80

#define IFNAME_LEN 25

#define MAX_INTERFACES 100

#define IPSTR_LEN 16

#define PUBKEY_LEN 256  /* big enough for RSA-2048 */

#define RAND_LEN 32     /* rfc 5246 */

#define HMAC_LEN 64     /* big enough for SHA-512 */

#define VERIFY_LEN 12   /* rfc 5246 */

#define MASTER_LEN 48   /* rfc 5246 */

#define MAXIV 16        /* big enough for AES256 */

#define MAXKEY 32       /* big enough for AES256 */

#define KEYBLSIZE 16    /* Maximum symmetric key blocksize */

#define DEF_RSA_LEN 512 /* Default length of generated RSA keys */

#define RSA_EXP 65537   /* Public key exponent of generated RSA keys */

#define SALT_LEN 4      /* Length of salt for IV */

#define GCM_IV_LEN 12   /* Length of IV for ciphers in GCM mode */

#define CCM_IV_LEN 12   /* Length of IV for ciphers in CCM mode */

#define GCM_TAG_LEN 16  /* Length of tag for ciphers in GCM mode */

#define CCM_TAG_LEN 16  /* Length of tag for ciphers in CCM mode */

#define UFTP_LEN 16

#define ANNOUNCE_LEN 16

#define ENC_INFO_LEN 44

#define REGISTER_LEN 44

#define CLIENT_KEY_LEN 8

#define REG_CONF_LEN 4

#define KEYINFO_LEN 12

#define DESTKEY_LEN 52

#define KEYINFO_ACK_LEN 16

#define FILEINFO_LEN 28

#define FILEINFO_ACK_LEN 16

#define FILESEG_LEN 8

#define TFMCC_DATA_LEN 8

#define DONE_LEN 8

#define STATUS_LEN 8

#define COMPLETE_LEN 8

#define FREESPACE_LEN 12

#define DONE_CONF_LEN 4

#define HB_REQ_LEN 12

#define HB_RESP_LEN 8

#define KEY_REQ_LEN 4

#define PROXY_KEY_LEN 12

#define ENCRYPTED_LEN 12

#define ABORT_LEN 308

#define CONG_CTRL_LEN 16

#define CC_ITEM_LEN 8

#define CC_ACK_LEN 4

#define TFMCC_ACK_LEN 20

#define RSA_BLOB_LEN 8

#define EC_BLOB_LEN 4

void proto_register_uftp4(void);

static int proto_uftp;

/* main header and common fields */

static int hf_uftp_version;

static int hf_uftp_func;

static int hf_uftp_seq;

static int hf_uftp_src_id;

static int hf_uftp_group_id;

static int hf_uftp_group_inst;

static int hf_uftp_grtt;

static int hf_uftp_gsize;

static int hf_uftp_reserved;

static int hf_uftp_destlist;

static int hf_uftp_dest;

/* ANNOUNCE fields */

static int hf_uftp_announce;

static int hf_uftp_announce_func;

static int hf_uftp_announce_hlen;

static int hf_uftp_announce_flags;

static int hf_uftp_announce_flags_sync;

static int hf_uftp_announce_flags_syncpreview;

static int hf_uftp_announce_flags_ipv6;

static int hf_uftp_announce_flags_reserved;

static int hf_uftp_announce_robust;

static int hf_uftp_announce_cc_type;

static int hf_uftp_announce_reserved;

static int hf_uftp_announce_blocksize;

static int hf_uftp_announce_tstamp;

static int hf_uftp_announce_publicmcast_ipv4;

static int hf_uftp_announce_publicmcast_ipv6;

static int hf_uftp_announce_privatemcast_ipv4;

static int hf_uftp_announce_privatemcast_ipv6;

/* EXT_ENC_INFO fields */

static int hf_uftp_encinfo;

static int hf_uftp_encinfo_exttype;

static int hf_uftp_encinfo_extlen;

static int hf_uftp_encinfo_flags;

static int hf_uftp_encinfo_flags_client_auth;

static int hf_uftp_encinfo_flags_reserved;

static int hf_uftp_encinfo_keyextype;

static int hf_uftp_encinfo_sigtype;

static int hf_uftp_encinfo_keytype;

static int hf_uftp_encinfo_hashtype;

static int hf_uftp_encinfo_keylen;

static int hf_uftp_encinfo_dhlen;

static int hf_uftp_encinfo_siglen;

static int hf_uftp_encinfo_rand1;

static int hf_uftp_encinfo_keyblob;

static int hf_uftp_encinfo_dhblob;

static int hf_uftp_encinfo_sig;

/* rsa_blob_t fields */

static int hf_uftp_rsablob_blobtype;

static int hf_uftp_rsablob_reserved;

static int hf_uftp_rsablob_modlen;

static int hf_uftp_rsablob_exponent;

static int hf_uftp_rsablob_modulus;

/* ec_blob_t fields */

static int hf_uftp_ecblob_blobtype;

static int hf_uftp_ecblob_curve;

static int hf_uftp_ecblob_keylen;

static int hf_uftp_ecblob_key;

/* REGISTER fields */

static int hf_uftp_register;

static int hf_uftp_register_func;

static int hf_uftp_register_hlen;

static int hf_uftp_register_keyinfo_len;

static int hf_uftp_register_tstamp;

static int hf_uftp_register_rand2;

static int hf_uftp_register_keyinfo;

/* CLIENT_KEY fields */

static int hf_uftp_clientkey;

static int hf_uftp_clientkey_func;

static int hf_uftp_clientkey_hlen;

static int hf_uftp_clientkey_reserved;

static int hf_uftp_clientkey_bloblen;

static int hf_uftp_clientkey_siglen;

static int hf_uftp_clientkey_keyblob;

static int hf_uftp_clientkey_verify;

/* REG_CONF fields */

static int hf_uftp_regconf;

static int hf_uftp_regconf_func;

static int hf_uftp_regconf_hlen;

static int hf_uftp_regconf_reserved;

/* KEYINFO fields */

static int hf_uftp_keyinfo;

static int hf_uftp_keyinfo_func;

static int hf_uftp_keyinfo_hlen;

static int hf_uftp_keyinfo_reserved;

static int hf_uftp_keyinfo_ivctr;

static int hf_uftp_keyinfo_destkey;

static int hf_uftp_keyinfo_destid;

static int hf_uftp_keyinfo_groupmaster;

/* KEYINFO_ACK fields */

static int hf_uftp_keyinfoack;

static int hf_uftp_keyinfoack_func;

static int hf_uftp_keyinfoack_hlen;

static int hf_uftp_keyinfoack_reserved;

static int hf_uftp_keyinfoack_verify_data;

/* FILEINFO fields */

static int hf_uftp_fileinfo;

static int hf_uftp_fileinfo_func;

static int hf_uftp_fileinfo_hlen;

static int hf_uftp_fileinfo_file_id;

static int hf_uftp_fileinfo_ftype;

static int hf_uftp_fileinfo_reserved;

static int hf_uftp_fileinfo_namelen;

static int hf_uftp_fileinfo_linklen;

static int hf_uftp_fileinfo_fsize;

static int hf_uftp_fileinfo_ftstamp;

static int hf_uftp_fileinfo_tstamp;

static int hf_uftp_fileinfo_name;

static int hf_uftp_fileinfo_link;

/* FILEINFO_ACK fields */

static int hf_uftp_fileinfoack;

static int hf_uftp_fileinfoack_func;

static int hf_uftp_fileinfoack_hlen;

static int hf_uftp_fileinfoack_file_id;

static int hf_uftp_fileinfoack_flags;

static int hf_uftp_fileinfoack_flags_partial;

static int hf_uftp_fileinfoack_flags_reserved;

static int hf_uftp_fileinfoack_reserved;

static int hf_uftp_fileinfoack_tstamp;

/* FILESEG fields */

static int hf_uftp_fileseg;

static int hf_uftp_fileseg_func;

static int hf_uftp_fileseg_hlen;

static int hf_uftp_fileseg_file_id;

static int hf_uftp_fileseg_section;

static int hf_uftp_fileseg_sec_block;

static int hf_uftp_fileseg_data;

/* EXT_TFMCC_DATA_INFO fields */

static int hf_uftp_tfmccdata;

static int hf_uftp_tfmccdata_exttype;

static int hf_uftp_tfmccdata_extlen;

static int hf_uftp_tfmccdata_send_rate;

static int hf_uftp_tfmccdata_cc_seq;

static int hf_uftp_tfmccdata_cc_rate;

/* DONE fields */

static int hf_uftp_done;

static int hf_uftp_done_func;

static int hf_uftp_done_hlen;

static int hf_uftp_done_file_id;

static int hf_uftp_done_section;

static int hf_uftp_done_reserved;

/* STATUS fields */

static int hf_uftp_status;

static int hf_uftp_status_func;

static int hf_uftp_status_hlen;

static int hf_uftp_status_file_id;

static int hf_uftp_status_section;

static int hf_uftp_status_reserved;

static int hf_uftp_status_naks;

/* COMPLETE fields */

static int hf_uftp_complete;

static int hf_uftp_complete_func;

static int hf_uftp_complete_hlen;

static int hf_uftp_complete_file_id;

static int hf_uftp_complete_status;

static int hf_uftp_complete_reserved;

/* EXT_FREESPACE_INFO fields */

static int hf_uftp_freespace;

static int hf_uftp_freespace_exttype;

static int hf_uftp_freespace_extlen;

static int hf_uftp_freespace_reserved;

static int hf_uftp_freespace_freespace;

/* DONE_CONF fields */

static int hf_uftp_doneconf;

static int hf_uftp_doneconf_func;

static int hf_uftp_doneconf_hlen;

static int hf_uftp_doneconf_reserved;

/* HB_REQ fields */

static int hf_uftp_hbreq;

static int hf_uftp_hbreq_func;

static int hf_uftp_hbreq_hlen;

static int hf_uftp_hbreq_reserved;

static int hf_uftp_hbreq_bloblen;

static int hf_uftp_hbreq_siglen;

static int hf_uftp_hbreq_nonce;

static int hf_uftp_hbreq_keyblob;

static int hf_uftp_hbreq_verify;

/* HB_RESP fields */

static int hf_uftp_hbresp;

static int hf_uftp_hbresp_func;

static int hf_uftp_hbresp_hlen;

static int hf_uftp_hbresp_authenticated;

static int hf_uftp_hbresp_reserved;

static int hf_uftp_hbresp_nonce;

/* KEY_REQ fields */

static int hf_uftp_keyreq;

static int hf_uftp_keyreq_func;

static int hf_uftp_keyreq_hlen;

static int hf_uftp_keyreq_reserved;

/* PROXY_KEY fields */

static int hf_uftp_proxykey;

static int hf_uftp_proxykey_func;

static int hf_uftp_proxykey_hlen;

static int hf_uftp_proxykey_bloblen;

static int hf_uftp_proxykey_dhlen;

static int hf_uftp_proxykey_siglen;

static int hf_uftp_proxykey_nonce;

static int hf_uftp_proxykey_keyblob;

static int hf_uftp_proxykey_dhblob;

static int hf_uftp_proxykey_verify;

/* CONG_CTRL fields */

static int hf_uftp_congctrl;

static int hf_uftp_congctrl_func;

static int hf_uftp_congctrl_hlen;

static int hf_uftp_congctrl_reserved;

static int hf_uftp_congctrl_cc_seq;

static int hf_uftp_congctrl_cc_rate;

static int hf_uftp_congctrl_tstamp;

static int hf_uftp_congctrl_cclist;

static int hf_uftp_congctrl_item;

static int hf_uftp_congctrl_item_destid;

static int hf_uftp_congctrl_item_flags;

static int hf_uftp_congctrl_item_flags_clr;

static int hf_uftp_congctrl_item_flags_rtt;

static int hf_uftp_congctrl_item_flags_start;

static int hf_uftp_congctrl_item_flags_leave;

static int hf_uftp_congctrl_item_flags_reserved;

static int hf_uftp_congctrl_item_rtt;

static int hf_uftp_congctrl_item_rate;

/* CC_ACK fields */

static int hf_uftp_ccack;

static int hf_uftp_ccack_func;

static int hf_uftp_ccack_hlen;

static int hf_uftp_ccack_reserved;

/* EXT_TFMCC_ACK_INFO fields */

static int hf_uftp_tfmccack;

static int hf_uftp_tfmccack_exttype;

static int hf_uftp_tfmccack_extlen;

static int hf_uftp_tfmccack_flags;

static int hf_uftp_tfmccack_flags_clr;

static int hf_uftp_tfmccack_flags_rtt;

static int hf_uftp_tfmccack_flags_start;

static int hf_uftp_tfmccack_flags_leave;

static int hf_uftp_tfmccack_flags_reserved;

static int hf_uftp_tfmccack_reserved;

static int hf_uftp_tfmccack_cc_seq;

static int hf_uftp_tfmccack_cc_rate;

static int hf_uftp_tfmccack_client_id;

static int hf_uftp_tfmccack_tstamp;

/* ENCRYPTED fields */

static int hf_uftp_encrypted;

static int hf_uftp_encrypted_ivctr;

static int hf_uftp_encrypted_sig_len;

static int hf_uftp_encrypted_payload_len;

static int hf_uftp_encrypted_signature;

static int hf_uftp_encrypted_payload;

/* ABORT fields */

static int hf_uftp_abort;

static int hf_uftp_abort_func;

static int hf_uftp_abort_hlen;

static int hf_uftp_abort_flags;

static int hf_uftp_abort_flags_curfile;

static int hf_uftp_abort_flags_reserved;

static int hf_uftp_abort_reserved;

static int hf_uftp_abort_clientid;

static int hf_uftp_abort_message;

static int ett_uftp;

static int ett_uftp_announce;

static int ett_uftp_register;

static int ett_uftp_clientkey;

static int ett_uftp_regconf;

static int ett_uftp_keyinfo;

static int ett_uftp_keyinfoack;

static int ett_uftp_fileinfo;

static int ett_uftp_fileinfoack;

static int ett_uftp_fileseg;

static int ett_uftp_done;

static int ett_uftp_status;

static int ett_uftp_complete;

static int ett_uftp_doneconf;

static int ett_uftp_hbreq;

static int ett_uftp_hbresp;

static int ett_uftp_keyreq;

static int ett_uftp_proxykey;

static int ett_uftp_congctrl;

static int ett_uftp_ccack;

static int ett_uftp_encrypted;

static int ett_uftp_abort;

static int ett_uftp_announce_flags;

static int ett_uftp_encinfo;

static int ett_uftp_encinfo_flags;

static int ett_uftp_keyinfo_destkey;

static int ett_uftp_fileinfoack_flags;

static int ett_uftp_congctrl_cclist;

static int ett_uftp_congctrl_item;

static int ett_uftp_congctrl_item_flags;

static int ett_uftp_tfmccdata;

static int ett_uftp_tfmccack;

static int ett_uftp_tfmccack_flags;

static int ett_uftp_freespace;

static int ett_uftp_abort_flags;

static int ett_uftp_destlist;

static int ett_uftp_rsablob;

static int ett_uftp_ecblob;

static expert_field ei_uftp_length_invalid;

static expert_field ei_uftp_func_unknown;

static const value_string messages[] = {

    { ANNOUNCE,      "ANNOUNCE" },

    { REGISTER,      "REGISTER" },

    { CLIENT_KEY,    "CLIENT_KEY" },

    { REG_CONF,      "REG_CONF" },

    { KEYINFO,       "KEYINFO" },

    { KEYINFO_ACK,   "KEYINFO_ACK" },

    { FILEINFO,      "FILEINFO" },

    { FILEINFO_ACK,  "FILEINFO_ACK" },

    { FILESEG,       "FILESEG" },

    { DONE,          "DONE" },

    { STATUS,        "STATUS" },

    { COMPLETE,      "COMPLETE" },

    { DONE_CONF,     "DONE_CONF" },

    { HB_REQ,        "HB_REQ" },

    { HB_RESP,       "HB_RESP" },

    { KEY_REQ,       "KEY_REQ" },

    { PROXY_KEY,     "PROXY_KEY" },

    { ENCRYPTED,     "ENCRYPTED" },

    { ABORT,         "ABORT" },

    { CONG_CTRL,     "CONG_CTRL" },

    { CC_ACK,        "CC_ACK" },

    { 0, NULL }

};

static const value_string extensions[] = {

    { EXT_ENC_INFO,         "EXT_ENC_INFO" },

    { EXT_TFMCC_DATA_INFO,  "EXT_TFMCC_DATA_INFO" },

    { EXT_TFMCC_ACK_INFO,   "EXT_TFMCC_ACK_INFO" },

    { EXT_PGMCC_DATA_INFO,  "EXT_PGMCC_DATA_INFO" },

    { EXT_PGMCC_NAK_INFO,   "EXT_PGMCC_NAK_INFO" },

    { EXT_PGMCC_ACK_INFO,   "EXT_PGMCC_ACK_INFO" },

    { EXT_FREESPACE_INFO,   "EXT_FREESPACE_INFO" },

    { 0, NULL }

};

static const value_string cc_types[] = {

    { CC_NONE,  "NONE" },

    { CC_UFTP3,  "UFTP3" },

    { CC_TFMCC,  "TFMCC" },

    { CC_PGMCC,  "PGMCC" },

    { 0, NULL }

};

static const value_string keyblob_types[] = {

    { KEYBLOB_RSA,  "RSA" },

    { KEYBLOB_EC,   "EC" },

    { 0, NULL }

};

static const value_string curves[] = {

    { CURVE_sect163k1,  "sect163k1" },

    { CURVE_sect163r1,  "sect163r1" },

    { CURVE_sect163r2,  "sect163r2" },

    { CURVE_sect193r1,  "sect193r1" },

    { CURVE_sect193r2,  "sect193r2" },

    { CURVE_sect233k1,  "sect233k1" },

    { CURVE_sect233r1,  "sect233r1" },

    { CURVE_sect239k1,  "sect239k1" },

    { CURVE_sect283k1,  "sect283k1" },

    { CURVE_sect283r1,  "sect283r1" },

    { CURVE_sect409k1,  "sect409k1" },

    { CURVE_sect409r1,  "sect409r1" },

    { CURVE_sect571k1,  "sect571k1" },

    { CURVE_sect571r1,  "sect571r1" },

    { CURVE_secp160k1,  "secp160k1" },

    { CURVE_secp160r1,  "secp160r1" },

    { CURVE_secp160r2,  "secp160r2" },

    { CURVE_secp192k1,  "secp192k1" },

    { CURVE_secp192r1,  "prime192v1" },

    { CURVE_secp224k1,  "secp224k1" },

    { CURVE_secp224r1,  "secp224r1" },

    { CURVE_secp256k1,  "secp256k1" },

    { CURVE_secp256r1,  "prime256v1" },

    { CURVE_secp384r1,  "secp384r1" },

    { CURVE_secp521r1,  "secp521r1" },

    { 0, NULL }

};

static const value_string keyexchange_types[] = {

    { KEYEX_NONE,       "NONE" },

    { KEYEX_RSA,        "RSA" },

    { KEYEX_ECDH_RSA,   "ECDH_RSA" },

    { KEYEX_ECDH_ECDSA, "ECDH_ECDSA" },

    { 0, NULL }

};

static const value_string signature_types[] = {

    { SIG_NONE,     "NONE" },

    { SIG_HMAC,     "HMAC" },

    { SIG_KEYEX,    "KEYEX" },

    { SIG_AUTHENC,  "AUTHENC" },

    { 0, NULL }

};

static const value_string hash_types[] = {

    { HASH_NONE,   "NONE" },

    { HASH_MD5,    "MD5" },

    { HASH_SHA1,   "SHA-1" },

    { HASH_SHA256, "SHA-256" },

    { HASH_SHA384, "SHA-384" },

    { HASH_SHA512, "SHA-512" },

    { 0, NULL }

};

static const value_string key_types[] = {

    { KEY_NONE,         "NONE" },

    { KEY_DES,          "DES" },

    { KEY_DES_EDE3,     "3 Key Triple DES" },

    { KEY_AES128_CBC,   "AES-128-CBC" },

    { KEY_AES256_CBC,   "AES-256-CBC" },

    { KEY_AES128_GCM,   "AES-128-GCM" },

    { KEY_AES256_GCM,   "AES-256-GCM" },

    { KEY_AES128_CCM,   "AES-128-CCM" },

    { KEY_AES256_CCM,   "AES-256-CCM" },

    { 0, NULL }

};

static const value_string hb_auth_types[] = {

    { HB_AUTH_FAILED,    "Authorization Failed" },

    { HB_AUTH_OK,        "Authorization Succeeded" },

    { HB_AUTH_CHALLENGE, "Authorization Required" },

    { 0, NULL }

};

static const value_string file_types[] = {

    { FTYPE_REG,        "Regular file" },

    { FTYPE_DIR,        "Directory" },

    { FTYPE_LINK,       "Symbolic link" },

    { FTYPE_DELETE,     "Delete request" },

    { FTYPE_FREESPACE,  "Free space request" },

    { 0, NULL }

};

static int * const announce_flags[] = {

    &hf_uftp_announce_flags_sync,

    &hf_uftp_announce_flags_syncpreview,

    &hf_uftp_announce_flags_ipv6,

    &hf_uftp_announce_flags_reserved,

    NULL

};

static int * const encinfo_flags[] = {

    &hf_uftp_encinfo_flags_client_auth,

    &hf_uftp_encinfo_flags_reserved,

    NULL

};

static int * const fileinfoack_flags[] = {

    &hf_uftp_fileinfoack_flags_partial,

    &hf_uftp_fileinfoack_flags_reserved,

    NULL

};

static int * const abort_flags[] = {

    &hf_uftp_abort_flags_curfile,

    &hf_uftp_abort_flags_reserved,

    NULL

};

static int * const cc_item_flags[] = {

    &hf_uftp_congctrl_item_flags_clr,

    &hf_uftp_congctrl_item_flags_rtt,

    &hf_uftp_congctrl_item_flags_start,

    &hf_uftp_congctrl_item_flags_leave,

    &hf_uftp_congctrl_item_flags_reserved,

    NULL

};

static int * const tfmcc_ack_flags[] = {

    &hf_uftp_tfmccack_flags_clr,

    &hf_uftp_tfmccack_flags_rtt,

    &hf_uftp_tfmccack_flags_start,

    &hf_uftp_tfmccack_flags_leave,

    &hf_uftp_tfmccack_flags_reserved,

    NULL

};

static const value_string comp_status[] = {

    { COMP_STAT_NORMAL,     "Normal" },

    { COMP_STAT_SKIPPED,    "Skipped" },

    { COMP_STAT_OVERWRITE,  "Overwrite" },

    { COMP_STAT_REJECTED,   "Rejected" },

    { 0, NULL }

};

#define RTT_MIN 1.0e-6

#define RTT_MAX 1000.0

static double unquantize_grtt(uint8_t rtt)

{

    return ((rtt <= 31) ?

            (((double)(rtt + 1)) * (double)RTT_MIN) :

            (RTT_MAX / exp(((double)(255 - rtt)) / (double)13.0)));

}

static unsigned unquantize_gsize(uint8_t size)

{

    int E, i;

    double rval;

    E = size & 0x7;

    rval =  (size >> 3) * (10.0 / 32.0);

    for (i = 0; i < E; i++) {

        rval *= 10;

    }

    return (unsigned)(rval + 0.5);

}

static unsigned unquantize_rate(uint16_t rate)

{

    int E, i;

    double rval;

    E = rate & 0xF;

    rval = (rate >> 4) * (10.0 / 4096.0);

    for (i = 0; i < E; i++) {

        rval *= 10;

    }

    return (unsigned)rval;

}

static int dissect_uftp_rsablob(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int tree_hf)

{

    proto_item *ti = NULL;

    proto_tree *rsablob_tree = NULL;

    unsigned offset = 0, modlen;

    if (tvb_reported_length(tvb) < RSA_BLOB_LEN) {

        proto_tree_add_expert_format_remaining(tree, pinfo, &ei_uftp_length_invalid, tvb, offset,

                            "Invalid length: %d", tvb_reported_length(tvb));

        return 0;

    }

    modlen = (int)tvb_get_ntohs(tvb, 2);

    if (tvb_reported_length(tvb) < modlen + RSA_BLOB_LEN) {

        proto_tree_add_expert_format_remaining(tree, pinfo, &ei_uftp_length_invalid, tvb, offset,

                            "Invalid length, len = %d", tvb_reported_length(tvb));

        return 0;

    }

    ti = proto_tree_add_item(tree, tree_hf, tvb, offset, RSA_BLOB_LEN + modlen, ENC_NA);

    rsablob_tree = proto_item_add_subtree(ti, ett_uftp_rsablob);

    proto_tree_add_item(rsablob_tree, hf_uftp_rsablob_blobtype, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(rsablob_tree, hf_uftp_rsablob_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(rsablob_tree, hf_uftp_rsablob_modlen, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    proto_tree_add_item(rsablob_tree, hf_uftp_rsablob_exponent, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset += 4;

    proto_tree_add_item(rsablob_tree, hf_uftp_rsablob_modulus, tvb, offset, modlen, ENC_NA);

    return RSA_BLOB_LEN + modlen;

}

static int dissect_uftp_ecblob(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int tree_hf)

{

    proto_item *ti = NULL;

    proto_tree *ecblob_tree = NULL;

    unsigned offset = 0, keylen;

    if (tvb_reported_length(tvb) < EC_BLOB_LEN) {

        proto_tree_add_expert_format_remaining(tree, pinfo, &ei_uftp_length_invalid, tvb, offset,

                            "Invalid length: %d", tvb_reported_length(tvb));

        return 0;

    }

    keylen = (int)tvb_get_ntohs(tvb, 2);

    if (tvb_reported_length(tvb) < keylen + EC_BLOB_LEN) {

        proto_tree_add_expert_format_remaining(tree, pinfo, &ei_uftp_length_invalid, tvb, offset,

                            "Invalid length, len = %d", tvb_reported_length(tvb));

        return 0;

    }

    ti = proto_tree_add_item(tree, tree_hf, tvb, offset, EC_BLOB_LEN + keylen, ENC_NA);

    ecblob_tree = proto_item_add_subtree(ti, ett_uftp_ecblob);

    proto_tree_add_item(ecblob_tree, hf_uftp_ecblob_blobtype, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(ecblob_tree, hf_uftp_ecblob_curve, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(ecblob_tree, hf_uftp_ecblob_keylen, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    proto_tree_add_item(ecblob_tree, hf_uftp_ecblob_key, tvb, offset, keylen, ENC_NA);

    return EC_BLOB_LEN + keylen;

}

static int dissect_uftp_encinfo(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)

{

    proto_item *ti = NULL;

    proto_tree *encinfo_tree = NULL;

    unsigned offset = 0, hlen, keylen, dhlen, siglen;

    int8_t blobtype;

    tvbuff_t *next_tvb;

    if (tvb_reported_length(tvb) < ENC_INFO_LEN) {

        proto_tree_add_expert_format_remaining(tree, pinfo, &ei_uftp_length_invalid, tvb, offset,

                            "Invalid length: %d", tvb_reported_length(tvb));

        return 0;

    }

    hlen = tvb_get_uint8(tvb, 1) * 4;

    keylen = (int)tvb_get_ntohs(tvb, 6);

    dhlen = (int)tvb_get_ntohs(tvb, 8);

    siglen = (int)tvb_get_ntohs(tvb, 10);

    if ((tvb_reported_length(tvb) < hlen) ||

            (hlen < ENC_INFO_LEN + keylen + dhlen + siglen)) {

        proto_tree_add_expert_format_remaining(tree, pinfo, &ei_uftp_length_invalid, tvb, offset,

                            "Invalid length, len = %d, hlen = %d, "

                            "keylen = %d, dhlen = %d, siglen = %d",

                            tvb_reported_length(tvb), hlen, keylen, dhlen, siglen);

        return 0;

    }

    ti = proto_tree_add_item(tree, hf_uftp_encinfo, tvb, offset, ENC_INFO_LEN + keylen + dhlen + siglen, ENC_NA);

    encinfo_tree = proto_item_add_subtree(ti, ett_uftp_encinfo);

    proto_tree_add_item(encinfo_tree, hf_uftp_encinfo_exttype, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_uint_format_value(encinfo_tree, hf_uftp_encinfo_extlen, tvb, offset, 1, hlen, "%d bytes (%d)", hlen, hlen/4);

    offset += 1;

    proto_tree_add_bitmask(encinfo_tree, tvb, offset, hf_uftp_encinfo_flags, ett_uftp_encinfo_flags, encinfo_flags, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(encinfo_tree, hf_uftp_encinfo_keyextype, tvb, offset, 1, ENC_BIG_ENDIAN);

    proto_tree_add_item(encinfo_tree, hf_uftp_encinfo_sigtype, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(encinfo_tree, hf_uftp_encinfo_keytype, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(encinfo_tree, hf_uftp_encinfo_hashtype, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(encinfo_tree, hf_uftp_encinfo_keylen, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    proto_tree_add_item(encinfo_tree, hf_uftp_encinfo_dhlen, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    proto_tree_add_item(encinfo_tree, hf_uftp_encinfo_siglen, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    proto_tree_add_item(encinfo_tree, hf_uftp_encinfo_rand1, tvb, offset, RAND_LEN, ENC_NA);

    offset += RAND_LEN;

    if (keylen > 0) {

        int parsed = 0;

        next_tvb = tvb_new_subset_length(tvb, offset, keylen);

        blobtype = tvb_get_uint8(tvb, offset);

        switch (blobtype) {

        case KEYBLOB_RSA:

            parsed = dissect_uftp_rsablob(next_tvb, pinfo, encinfo_tree, hf_uftp_encinfo_keyblob);

            break;

        case KEYBLOB_EC:

            parsed = dissect_uftp_ecblob(next_tvb, pinfo, encinfo_tree, hf_uftp_encinfo_keyblob);

            break;

        }

        offset += parsed;

    }

    if (dhlen > 0) {

        int parsed = 0;

        next_tvb = tvb_new_subset_length(tvb, offset, dhlen);

        blobtype = tvb_get_uint8(tvb, offset);

        switch (blobtype) {

        case KEYBLOB_RSA:

            parsed = dissect_uftp_rsablob(next_tvb, pinfo, encinfo_tree, hf_uftp_encinfo_dhblob);

            break;

        case KEYBLOB_EC:

            parsed = dissect_uftp_ecblob(next_tvb, pinfo, encinfo_tree, hf_uftp_encinfo_dhblob);

            break;

        }

        offset += parsed;

    }

    if (siglen > 0) {

        proto_tree_add_item(encinfo_tree, hf_uftp_encinfo_sig, tvb, offset, siglen, ENC_NA);

    }

    return ENC_INFO_LEN + keylen + dhlen + siglen;

}

static void dissect_uftp_announce(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)

{

    proto_item *ti = NULL;

    proto_item *destlist = NULL;

    proto_tree *announce_tree = NULL;

    proto_tree *destlist_tree = NULL;

    unsigned offset = 0;

    unsigned hlen, iplen, destcount, idx, extlen_total;

    uint8_t flags, ext_type;

    tvbuff_t *next_tvb;

    if (tvb_reported_length(tvb) < ANNOUNCE_LEN) {

        proto_tree_add_expert_format_remaining(tree, pinfo, &ei_uftp_length_invalid, tvb, offset,

                            "Invalid length: %d", tvb_reported_length(tvb));

        return;

    }

    hlen = tvb_get_uint8(tvb, 1) * 4;

    if (tvb_reported_length(tvb) < hlen) {

        proto_tree_add_expert_format_remaining(tree, pinfo, &ei_uftp_length_invalid, tvb, offset,

                            "Invalid length, len = %d, hlen = %d",

                            tvb_reported_length(tvb), hlen);

        return;

    }

    flags = tvb_get_uint8(tvb, 2);

    ti = proto_tree_add_item(tree, hf_uftp_announce, tvb, offset, -1, ENC_NA);

    announce_tree = proto_item_add_subtree(ti, ett_uftp_announce);

    proto_tree_add_item(announce_tree, hf_uftp_announce_func, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_uint_format_value(announce_tree, hf_uftp_announce_hlen, tvb, offset, 1, hlen, "%d bytes (%d)", hlen, hlen/4);

    offset += 1;

    proto_tree_add_bitmask(announce_tree, tvb, offset, hf_uftp_announce_flags, ett_uftp_announce_flags, announce_flags, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(announce_tree, hf_uftp_announce_robust, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(announce_tree, hf_uftp_announce_cc_type, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(announce_tree, hf_uftp_announce_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(announce_tree, hf_uftp_announce_blocksize, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    proto_tree_add_item(announce_tree, hf_uftp_announce_tstamp, tvb, offset, 8, ENC_TIME_SECS_USECS|ENC_BIG_ENDIAN);

    offset += 8;

    if (flags & FLAG_IPV6) {

        iplen = 16;

        proto_tree_add_item(announce_tree, hf_uftp_announce_publicmcast_ipv6, tvb, offset, iplen, ENC_NA);

        offset += iplen;

        proto_tree_add_item(announce_tree, hf_uftp_announce_privatemcast_ipv6, tvb, offset, iplen, ENC_NA);

        offset += iplen;

    } else {

        iplen = 4;

        proto_tree_add_item(announce_tree, hf_uftp_announce_publicmcast_ipv4, tvb, offset, iplen, ENC_BIG_ENDIAN);

        offset += iplen;

        proto_tree_add_item(announce_tree, hf_uftp_announce_privatemcast_ipv4, tvb, offset, iplen, ENC_BIG_ENDIAN);

        offset += iplen;

    }

    extlen_total = hlen - (ANNOUNCE_LEN + ( 2 * iplen));

    while (extlen_total > 0) {

        int parsed = 0;

        next_tvb = tvb_new_subset_length(tvb, offset, extlen_total);

        ext_type = tvb_get_uint8(tvb, offset);

        switch (ext_type) {

        case EXT_ENC_INFO:

            parsed = dissect_uftp_encinfo(next_tvb, pinfo, announce_tree);

            break;

        }

        if (!parsed) break;

        extlen_total -= parsed;

        offset += parsed;

    }

    destcount = (tvb_reported_length(tvb) - hlen) / 4;

    offset = hlen;

    if (destcount > 0) {

        destlist = proto_tree_add_item(announce_tree, hf_uftp_destlist, tvb, offset, destcount * 4, ENC_NA);

        destlist_tree = proto_item_add_subtree(destlist, ett_uftp_destlist);

    }

    for (idx = 0; idx < destcount; idx++) {

        proto_tree_add_item(destlist_tree, hf_uftp_dest, tvb, offset, 4, ENC_BIG_ENDIAN);

        offset += 4;

    }

}

static void dissect_uftp_register(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)

{

    proto_item *ti = NULL;

    proto_item *destlist = NULL;

    proto_tree *register_tree = NULL;

    proto_tree *destlist_tree = NULL;

    unsigned offset = 0, hlen;

    unsigned destcount, keylen, idx;

    if (tvb_reported_length(tvb) < REGISTER_LEN) {

        proto_tree_add_expert_format_remaining(tree, pinfo, &ei_uftp_length_invalid, tvb, offset,

                            "Invalid length: %d", tvb_reported_length(tvb));

        return;

    }