EasyLogin

EasyLogin - Valheim online password manager (client only)

AI generated statement: This module is written by the AI ​​agent (WorkBuddy) under the clear needs and itemized acceptance of the user;

Functional design, real-device testing and release decisions are all led by users.

If you have entered the server once, the password will be automatically remembered; it will be automatically filled in/submitted next time you enter.

The original version of Valheim didn't have this capability - it wasn't done well, it wasn't written at all. This mod is completed with three Harmony patches,

No changes to game data, no network verification, and whether the host and teammates are installed will not be affected at all.

• Effect

| Scene | Original | Installed EasyLogin |

|---|---|---|

| Enter someone's password-protected server for the first time | Enter the password manually | Enter it manually as usual (the module will remember it) |

| Enter the same server for the second time | Enter again | Automatically fill in and submit, enter directly |

| The landlord changed the password | Prompt that the password is incorrect | Automatically forget the old password and ask you to re-enter it next time (then remember the new one) |

| Change to another server | Lose every time | Each has its own thing and does not interfere with each other |

Each server is recorded separately, and the matching basis is Steam ID / cross-platform host ID / room code / IP: port,

It is not a global variable such as "the last password entered".

• Installation

Just throw EasyLogin.dll into BepInEx/plugins/ (or use r2modman to import EasyLogin-1.0.0.zip).

The only dependency is BepInExPack_Valheim. No Jotunn required, no pre-frame required.

• Why the original version can’t do it (IL evidence)

The only entrance to the server password is ZNet.RPC_ClientHandshake(ZRpc rpc, bool needPassword, string serverPasswordSalt).

Initiated by the server during handshake. Implementation in the official version 1.0 (assembly_valheim.dll, IL offset is the relative offset within the function):

0000 m_connectingDialog.gameObject.SetActive(false)

0011 m_serverPasswordSalt = serverPasswordSalt ← Random salt issued by the server

0017 if (!needPassword) { SendPeerInfo(rpc, ""); return; } → 0077

001A m_passwordDialog.gameObject.SetActive(true) ← Pop-up box asking for password

002B var input = m_passwordDialog.GetComponent()

0037 input.text = ""

0042 input.ActivateInputField()

0047 input.OnInputSubmit.AddListener(OnPasswordEntered)

005D m_tempPasswordRPC = rpc

0064 call FejdStartup::get_ServerPassword

0069 brfalse.s → 0083 ← The only "autofill" in the original version

006B OnPasswordEntered(FejdStartup.ServerPassword)

That said: the original version does have autocomplete built in, provided FejdStartup.ServerPassword!= null.

So who wrote this ServerPassword? Check the reference of the complete assembly:

There are 1 methods that reference ['FejdStartup::set_ServerPassword']:

FejdStartup ParseArguments

There is only one place for ParseArguments - command line parameters. FejdStartup.ParseArguments recognizes exactly

The -password in the assembly string heap (there are also prompts such as $error_password / $menu_passwordinvalid).

So it will be filled in automatically only when started like valheim.exe -password xxx.

When playing normally, this field is always null, and you have to type it every time.

By the way, a detail you must know: the password is MD5 (ASCII (plain text + salt)) (ZNet.HashPassword, IL is

Encoding.ASCII.GetBytes(password + salt) → MD5CryptoServiceProvider.ComputeHash），

The salt is a 16-byte random number generated by the server for each handshake (in ZNet.ServerPasswordSalt()

RandomNumberGenerator.GetBytes(16)）。

Therefore, the hash cannot be pre-calculated and stored locally, only plain text can be stored - any "remember online password" module cannot circumvent this.

This module will try not to let it sit on the hard drive in clear text (see Section 5).

• Three p …