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use binaryninja::file_metadata::SessionId;
use binaryninja::{
binary_view::{BinaryView, BinaryViewBase, BinaryViewExt},
file_metadata::FileMetadata,
metadata::Metadata,
rc::Ref,
settings::{QueryOptions, Settings},
ObjectDestructor,
};
use dashmap::DashMap;
use once_cell::sync::Lazy;
use std::{
collections::{HashMap, HashSet},
ops::Range,
sync::{Arc, RwLock},
};
pub struct AnalysisInfo {
pub image_base: u64,
pub objc_stubs: Option<Range<u64>>,
pub should_rewrite_to_direct_calls: bool,
selector_impls: RwLock<SelectorImplsState>,
}
enum SelectorImplsState {
NotLoaded,
Loaded(Option<SelectorImplementations>),
}
struct SelectorImplementations {
sel_ref_to_impl: HashMap<u64, Vec<u64>>,
sel_to_impl: HashMap<u64, Vec<u64>>,
}
static VIEW_INFOS: Lazy<DashMap<SessionId, Arc<AnalysisInfo>>> = Lazy::new(DashMap::new);
static IGNORED_VIEWS: Lazy<DashMap<SessionId, bool>> = Lazy::new(DashMap::new);
struct ObjectLifetimeObserver;
impl ObjectDestructor for ObjectLifetimeObserver {
fn destruct_file_metadata(&self, metadata: &FileMetadata) {
let id = metadata.session_id();
VIEW_INFOS.remove(&id);
IGNORED_VIEWS.remove(&id);
}
}
static SUPPORTED_ARCHS: Lazy<HashSet<&'static str>> = Lazy::new(|| {
let mut m = HashSet::new();
m.insert("aarch64");
m.insert("x86_64");
m.insert("armv7");
m.insert("thumb2");
m
});
fn is_supported_arch(bv: &BinaryView) -> bool {
let arch_name = bv
.default_arch()
.map(|arch| arch.name())
.unwrap_or_default();
SUPPORTED_ARCHS.contains(&arch_name as &str)
}
pub struct GlobalState;
impl GlobalState {
pub fn register_cleanup() {
let observer = Box::leak(Box::new(ObjectLifetimeObserver));
observer.register();
}
fn id(bv: &BinaryView) -> SessionId {
bv.file().session_id()
}
pub fn analysis_info(bv: &BinaryView) -> Option<Arc<AnalysisInfo>> {
let id = Self::id(bv);
if let Some(info) = VIEW_INFOS.get(&id) {
if bv.start() == info.image_base {
return Some(info.clone());
}
}
let info = Arc::new(AnalysisInfo::from_view(bv)?);
VIEW_INFOS.insert(id, info.clone());
Some(info)
}
pub fn should_ignore_view(bv: &BinaryView) -> bool {
if let Some(ignore) = IGNORED_VIEWS.get(&Self::id(bv)) {
return *ignore;
}
let ignore = !(is_supported_arch(bv) && AnalysisInfo::has_metadata(bv));
IGNORED_VIEWS.insert(Self::id(bv), ignore);
ignore
}
}
impl AnalysisInfo {
fn from_view(bv: &BinaryView) -> Option<Self> {
let should_rewrite_to_direct_calls = Settings::new().get_bool_with_opts(
"analysis.objectiveC.resolveDynamicDispatch",
&mut QueryOptions::new_with_view(bv),
);
let info = AnalysisInfo {
image_base: bv.start(),
objc_stubs: bv
.section_by_name("__objc_stubs")
.map(|section| section.start()..section.end()),
should_rewrite_to_direct_calls,
selector_impls: RwLock::new(SelectorImplsState::NotLoaded),
};
if !Self::has_metadata(bv) {
return None;
}
Some(info)
}
fn has_metadata(bv: &BinaryView) -> bool {
bv.query_metadata("Objective-C").is_some()
}
pub fn get_selector_impl(&self, bv: &BinaryView, selector_addr: u64) -> Option<u64> {
let get = |impls: &SelectorImplementations| {
impls
.sel_ref_to_impl
.get(&selector_addr)
.or_else(|| impls.sel_to_impl.get(&selector_addr))
.and_then(|v| v.first().copied())
.filter(|&addr| addr != 0)
};
let cache = self.selector_impls.read().unwrap();
match &*cache {
SelectorImplsState::Loaded(Some(impls)) => return get(impls),
SelectorImplsState::Loaded(None) => return None,
SelectorImplsState::NotLoaded => {}
}
drop(cache);
let mut cache = self.selector_impls.write().unwrap();
if let SelectorImplsState::NotLoaded = &*cache {
*cache = SelectorImplsState::Loaded(self.load_selector_impls(bv));
}
if let SelectorImplsState::Loaded(Some(impls)) = &*cache {
get(impls)
} else {
None
}
}
fn load_selector_impls(&self, bv: &BinaryView) -> Option<SelectorImplementations> {
let Some(Ok(meta)) = bv.get_metadata::<HashMap<String, Ref<Metadata>>>("Objective-C")
else {
return None;
};
let version_meta = meta.get("version")?;
if version_meta.get_unsigned_integer()? != 1 {
tracing::error!(
"workflow_objc: Unexpected Objective-C metadata version. Expected 1, got {}.",
version_meta.get_unsigned_integer()?
);
return None;
}
let mut sel_ref_to_impl = HashMap::new();
if let Some(sel_ref_to_impl_meta) = meta.get("selRefImplementations") {
if let Some(map) = Self::parse_selector_impls(sel_ref_to_impl_meta) {
sel_ref_to_impl = map;
}
}
let mut sel_to_impl = HashMap::new();
if let Some(sel_to_impl_meta) = meta.get("selImplementations") {
if let Some(map) = Self::parse_selector_impls(sel_to_impl_meta) {
sel_to_impl = map;
}
}
Some(SelectorImplementations {
sel_ref_to_impl,
sel_to_impl,
})
}
fn parse_selector_impls(meta: &Metadata) -> Option<HashMap<u64, Vec<u64>>> {
let array = meta.get_array()?;
let mut result = HashMap::new();
for item in &array {
let item = item.get_array()?;
if item.len() != 2 {
tracing::warn!(
"Expected selector implementation metadata to have 2 items, found {}",
item.len()
);
return None;
}
let selector = item.get(0).get_unsigned_integer()?;
let impls_meta = item.get(1).get_unsigned_integer_list()?;
result.insert(selector, impls_meta);
}
Some(result)
}
}
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