def readExports(self) -> None:
"""
Gets export symbols
"""
self.exports = []
# try to get exports by LC_DYLD_INFO
dyldInfo = self.machoFile.getLoadCommand(
(MachO.LoadCommands.LC_DYLD_INFO,
MachO.LoadCommands.LC_DYLD_INFO_ONLY))
if dyldInfo:
self.exports = MachO.TrieParser(dyldInfo.exportData).parse()
else:
# try to get exports by LC_DYLD_EXPORTS_TRIE
exportsTrie = self.machoFile.getLoadCommand(
MachO.LoadCommands.LC_DYLD_EXPORTS_TRIE)
if exportsTrie:
self.exports = MachO.TrieParser(
exportsTrie.linkeditData).parse()
else:
logging.warning("Unable to get export data.")
# remove any non ReExport symbols
reExportDeps = []
deps = self.machoFile.getLoadCommand(
(MachO.LoadCommands.LC_LOAD_DYLIB,
MachO.LoadCommands.LC_LOAD_WEAK_DYLIB,
MachO.LoadCommands.LC_REEXPORT_DYLIB,
MachO.LoadCommands.LC_LOAD_UPWARD_DYLIB),
multiple=True)
if deps:
depIndex = 0
for dep in deps:
depIndex += 1
if dep.cmd == MachO.LoadCommands.LC_REEXPORT_DYLIB:
reExportDeps.append(depIndex)
def isReExport(entry: MachO.TrieEntry) -> bool:
if (entry.flags & MachO.Export.EXPORT_SYMBOL_FLAGS_KIND_MASK
) != MachO.Export.EXPORT_SYMBOL_FLAGS_KIND_REGULAR:
return True
if (entry.flags & MachO.Export.EXPORT_SYMBOL_FLAGS_REEXPORT) == 0:
return True
if entry.other in reExportDeps:
return True
return False
self.exports = [
export for export in self.exports if isReExport(export)
]
pass
def lookupSymbol(self, addr: int) -> bytes:
"""
Given the VMAddress of an exported function,
this method will return its symbol name.
"""
if addr in self.symbolCache:
return self.symbolCache[addr]
# find the image with the address and cache its exports.
for image in self.imageCache:
if image.containsAddr(addr):
dyldInfo = image.getLoadCommand(
(MachO.LoadCommands.LC_DYLD_INFO,
MachO.LoadCommands.LC_DYLD_INFO_ONLY))
dyldInfo.loadData()
imageTextSeg = image.getSegment(b"__TEXT\x00")
exports = MachO.TrieParser(dyldInfo.exportData).parse()
for export in exports:
exportAddr = imageTextSeg.vmaddr + export.address
self.symbolCache[exportAddr] = export.name
break
# look for the symbol again
if addr in self.symbolCache:
return self.symbolCache[addr]
else:
return None
def readExports(self) -> None:
"""
Gets export symbols
"""
exportData = self.machoFile.getLoadCommand(
(MachO.LoadCommands.LC_DYLD_INFO,
MachO.LoadCommands.LC_DYLD_INFO_ONLY)).exportData
self.exports = MachO.TrieParser(exportData).parse()
# remove any non ReExport symbols
reExportDeps = []
deps = self.machoFile.getLoadCommand(
(MachO.LoadCommands.LC_LOAD_DYLIB,
MachO.LoadCommands.LC_LOAD_WEAK_DYLIB,
MachO.LoadCommands.LC_REEXPORT_DYLIB,
MachO.LoadCommands.LC_LOAD_UPWARD_DYLIB),
multiple=True)
if deps:
depIndex = 0
for dep in deps:
depIndex += 1
if dep.cmd == MachO.LoadCommands.LC_REEXPORT_DYLIB:
reExportDeps.append(depIndex)
def isReExport(entry: MachO.TrieEntry) -> bool:
if (entry.flags & MachO.Export.EXPORT_SYMBOL_FLAGS_KIND_MASK
) != MachO.Export.EXPORT_SYMBOL_FLAGS_KIND_REGULAR:
return True
if (entry.flags & MachO.Export.EXPORT_SYMBOL_FLAGS_REEXPORT) == 0:
return True
if entry.other in reExportDeps:
return True
return False
self.exports = [
export for export in self.exports if isReExport(export)
]
pass