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79 lines
3.5 KiB
Markdown
79 lines
3.5 KiB
Markdown
# set_mitm
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set_mitm is a sysmodule that enables intercepting requests to the system settings service.
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## Atmosphère Extensions
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set_mitm intercepts the `GetFirmwareVersion` command, if the requester is `qlaunch` or `maintenance`.\
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It modifies the `display_version` field of the returned system version, causing the version to display\
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in settings as `#.#.# (AMS #.#.#)`. This allows users to easily verify what version of Atmosphère they are running.
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set_mitm also intercepts the `GetSettingsItemValueSize` and `GetSettingsItemValue` commands for all requesters.\
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It does so in order to enable user configuration of system settings, which are parsed from `atmosphere/system_settings.ini` on boot.\
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The format for settings is described below.
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### Atmosphère Settings Format
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Settings are parsed from the `atmosphere/system_settings.ini` file during the boot process. This file is a normal ini file,\
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with some specific interpretations.
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The standard representation of a system setting's identifier takes the form `name!key`. This is represented within\
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`system_settings.ini` as a section `name`, with an entry `key`. For example:
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```
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[name]
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key = ...
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```
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System settings can have variable types (strings, integral values, byte arrays, etc). To accommodate this, `system_settings.ini`\
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must store values as a `type_identifier!value_store` pair. A number of different types are supported, with identifiers detailed below.\
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Please note that a malformed value string will cause a fatal error to occur on boot. A full example of a custom setting is given below\
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(setting `eupld!upload_enabled = 0`), for posterity:
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```
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[eupld]
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upload_enabled = u8!0x0
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```
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### Supported Types
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* Strings
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* Type identifiers: `str`, `string`
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* The value string is used directly as the setting, with null terminator appended.
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* Integral types
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* Type identifiers: `u8`, `u16`, `u32`, `u64`
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* The value string is parsed via a call to `strtoul(value, NULL, 0)`.
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* Setting bitwidth is determined by the identifier (8 for 1 byte, 16 for 2 bytes, and so on).
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* Raw bytes
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* Type identifiers: `hex`, `bytes`
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* The value string is parsed as a hexadecimal string.
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* The value string must be of even length, or a fatal error will be thrown on parse.
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### Atmosphère Custom Settings
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At the time of writing, Atmosphère implements two custom settings, found in the `atmosphere` section.\
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While not used for set_mitm, `power_menu_reboot_function` is loaded and controls the reboot behaviour of the console. By default, this value\
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is "payload", where the console will automatically reboot into the RCM payload stored in `sdmc:/atmosphere/reboot_payload.bin`.\
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(This payload is also used for fatal, upon a serious crash.) Setting the value to "rcm" reboots directly into RCM, and setting the value\
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to "normal" skips these behaviours.
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```
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[atmosphere]
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power_menu_reboot_function = str!payload
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```
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`dmnt_cheats_enabled_by_default` controls the behaviour of dmnt's cheat functionality. By default, this value is "0x1", enabling any cheats\
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defined by the user. Check [cheats](../cheats.md) for more information about Atmosphère's cheat functionality.
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```
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[atmosphere]
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dmnt_cheats_enabled_by_default = u8!0x1
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```
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`dmnt_always_save_cheat_toggles` controls the behaviour of dmnt's cheat toggle functionality. By default, this value is "0x0", causing toggles to\
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only be saved on game quit if a toggle file existed on game boot. Check [cheats](../cheats.md) for more information about Atmosphère's cheat functionality.
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```
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[atmosphere]
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dmnt_always_save_cheat_toggles = u8!0x0
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```
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