Unofficial Protocol Extensions

The following is a collection of Hotline protocol extensions discovered or documented in various third party Hotline clients, servers, and trackers. Please note that some of these may clash with other extensions described here, should you wish to implement them. Some are documented, but unused, however.

This page is an active work in progress and is incomplete.

Hotline Open Protocol Extensions (HOPE)

HOPE is implemented primarily in various distributions of HXD. It offers an advanced layer of security over vanilla Hotline using cryptography.

HOPE Transaction Types

File Hash (3808)

Initiator: Client

HOPE Transaction Fields

Session Key (3587)

MAC Algorithm (3588)

Type: String

Can be one of: "HMAC-MD5", "HMAC-SHA1", "MD5", or "SHA1"

SID (3687)

MD5 Hash (3712)

Type: Binary

HAVAL Hash (3713)

Type: Binary

SHA1 Hash (3714)

Type: Binary

Icon cicn (3728)

Chat Away (3745)

Type: Integer

Server Cipher Algorithm (3777)

Type: String

Can be one of: "BLOWFISH", "IDEA", "RC4", or "NONE" (0)

Client Cipher Algorithm (3778)

Type: String

Can be one of: "BLOWFISH", "IDEA", "RC4", or "NONE" (0)

Server Cipher Mode (3779)

Client Cipher Mode (3780)

Server Cipher IVEC (3781)

Type: Binary

Client Cipher IVEC (3782)

Type: Binary

Server Checksum Algorithm (3783)

Client Checksum Algorithm (3784)

Server Compression Algorithm (3785)

Type: String

Can be one of: "GZIP" or "NONE" (0)

Client Compression Algorithm (3786)

Type: String

Can be one of: "GZIP" or "NONE" (0)

Avaraline extensions

Avaraline seems to have additions relating to either custom or animated icons using the GIF format, with a few other additions. HXD has incorporated support for it.

Avaraline Transaction Types

Icon list (1861)

Initiator: Client

Set icon (1862)

Initiator: Client

Get icon (1863)

Initiator: Client

Icon change (1864)

Initiator: Server

Link login (2048)

Initiator: Server

Link join (2049)

Initiator: Server

Link leave (2050)

Initiator: Server

Link packet (2051)

Initiator: Server

Get news unformatted (2149)

Initiator: Client

Get user info unformatted (2160)

Initiator: Client

Account self modify (2304)

Initiator: Client

Permission list (2305)

Initiator: Client

Avaraline Transaction Fields

GIF Icon (768)

Type: Binary

GIF List (769)

Type: Binary

Offset (793)

Limit (794)

Count (795)

News Limit (800)

Search (1024)

Color (1280)

Type: Integer

Packet (1536)

Post (2048)

Post ID (2049)

Permission Group (2128)

Permissions (2129)

IP Address (2304)

GLoarbLine extensions

GLoarbLine is a derivative of the official Hotline source code which adds minimal HOPE support along with new account permissions and some misc. packets

GLoarbLine Transaction Types

Icon change (123)

Nickname change (124)

Fake red (125)

Away (126)

myTran_CrazyServer (127)

Block download (128)

Visibility (129)

Admin spector (130)

Standard message (131)

Edit news article (412)

GLoarbLine Transaction Fields

Icon ID (117)

Nickname (118)

Fake Red (119)

Away (120)

Block Download (121)

Visible (122)

Admin Spector (123)

Standard Message (124)

GLoarbLine Privilege Bits

GLoarbLine introduces a few new privilege bits in addition to the official privilege bits.

All privs on looks like this.

In Hex 'FF F3 CF EF FF FF FE 00'
11111111-11110011-11001111-11111111-11111111-11111111-11111110-00000000

PHXD extensions

Catkiller's PHXD server adds a single addition to Hotline's transaction fields to support an IRC bridge, along with supporting HOPE and Avaraline (mostly).

PHXD Transaction Fields

Old IRC Nickname (1024)