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Merged
merged 1 commit into from
Oct 12, 2025
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Merged

esrt: Get full ESRT table entries on Windows #220

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22 changes: 21 additions & 1 deletion Cargo.lock
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1 change: 1 addition & 0 deletions framework_lib/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,7 @@ clap = { version = "4.5", features = ["derive", "cargo"] }
clap-num = { version = "1.2.0" }
clap-verbosity-flag = { version = "2.2.1" }
windows-version = "0.1.4"
winreg = "0.55.0"

[target.'cfg(unix)'.dependencies]
libc = "0.2.155"
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84 changes: 25 additions & 59 deletions framework_lib/src/esrt/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,11 @@ use std::io;
#[cfg(target_os = "linux")]
use std::path::Path;

#[cfg(target_os = "windows")]
use winreg::enums::HKEY_LOCAL_MACHINE;
#[cfg(target_os = "windows")]
use winreg::RegKey;

#[cfg(target_os = "freebsd")]
use nix::ioctl_readwrite;
#[cfg(target_os = "freebsd")]
Expand Down Expand Up @@ -425,67 +430,28 @@ pub fn get_esrt() -> Option<Esrt> {
resource_version: ESRT_FIRMWARE_RESOURCE_VERSION,
entries: vec![],
};
use wmi::*;
debug!("Opening WMI");
let wmi_con = WMIConnection::new(COMLibrary::new().unwrap()).unwrap();
use std::collections::HashMap;
use wmi::Variant;
debug!("Querying WMI");
let results: Vec<HashMap<String, Variant>> = wmi_con.raw_query("SELECT HardwareID, Name FROM Win32_PnPEntity WHERE ClassGUID = '{f2e7dd72-6468-4e36-b6f1-6488f42c1b52}'").unwrap();

let re = regex::Regex::new(r"([\-a-h0-9]+)\}&REV_([A-F0-9]+)").expect("Bad regex");
for (i, val) in results.iter().enumerate() {
let hwid = &val["HardwareID"];
if let Variant::Array(strs) = hwid {
if let Variant::String(s) = &strs[0] {
// Sample "UEFI\\RES_{c57fd615-2ac9-4154-bf34-4dc715344408}&REV_CF"
let caps = re.captures(s).expect("No caps");
let guid_str = caps.get(1).unwrap().as_str().to_string();
let ver_str = caps.get(2).unwrap().as_str().to_string();

let guid = GUID::parse(guid_str.trim()).expect("Kernel provided wrong value");
let guid_kind = match_guid_kind(&CGuid::from(guid));
let ver = u32::from_str_radix(&ver_str, 16).unwrap();
debug!("ESRT Entry {}", i);
debug!(" Name: {:?}", guid_kind);
debug!(" GUID: {}", guid_str);
debug!(" Version: {:X} ({})", ver, ver);

let fw_type = if let Variant::String(name) = &val["Name"] {
match name.as_str() {
"System Firmware" => 1,
"Device Firmware" => 2,
_ => 0,
}
} else {
0
};

// TODO: The missing fields are present in Device Manager
// So there must be a way to get at them
let esrt = EsrtResourceEntry {
fw_class: CGuid::from(guid),
fw_type,
fw_version: ver,
// TODO: Not exposed by windows
lowest_supported_fw_version: 0,
// TODO: Not exposed by windows
capsule_flags: 0,
// TODO: Not exposed by windows
last_attempt_version: 0,
// TODO: Not exposed by windows
last_attempt_status: 0,
};
esrt_table.resource_count += 1;
esrt_table.resource_count_max += 1;
esrt_table.entries.push(esrt);
} else {
error!("Strs: {:#?}", strs[0]);
}
} else {
error!("{:#?}", hwid);
}
let hklm = RegKey::predef(HKEY_LOCAL_MACHINE);
let esrt = hklm.open_subkey("HARDWARE\\UEFI\\ESRT").ok()?;
for subkey in esrt.enum_keys() {
let guid = subkey.ok()?;
let short_guid = guid.trim_matches(|c| c == '{' || c == '}');
let esrt_entry = esrt.open_subkey(&guid).ok()?;
let esrt = EsrtResourceEntry {
fw_class: GUID::parse(&short_guid).ok()?.into(),
fw_type: esrt_entry.get_value("Type").ok()?,
fw_version: esrt_entry.get_value("Version").ok()?,
lowest_supported_fw_version: esrt_entry.get_value("LowestSupportedVersion").ok()?,
capsule_flags: 0,
last_attempt_version: esrt_entry.get_value("LastAttemptVersion").ok()?,
last_attempt_status: esrt_entry.get_value("LastAttemptStatus").ok()?,
};

esrt_table.resource_count += 1;
esrt_table.resource_count_max += 1;
esrt_table.entries.push(esrt);
}

Some(esrt_table)
}

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