|
|
@@ -0,0 +1,97 @@
|
|
|
+#!/usr/bin/env python3
|
|
|
+
|
|
|
+# Dynamic linking consistency checker
|
|
|
+# hacked together by _that@xda, 2014-12 to 2022-03
|
|
|
+
|
|
|
+import os
|
|
|
+import string
|
|
|
+import argparse
|
|
|
+
|
|
|
+
|
|
|
+def ldcheck(files, libpath, printalldefined, printresolved, demangle):
|
|
|
+ nmopts = "-C" if demangle else ""
|
|
|
+ libs = files
|
|
|
+ libswithpath = []
|
|
|
+
|
|
|
+ # find all dependencies
|
|
|
+ for filename in libs:
|
|
|
+ if not os.path.isfile(filename) and libpath:
|
|
|
+ filename = findlibraryinpath(filename, libpath)
|
|
|
+ libswithpath.append(filename)
|
|
|
+ with os.popen("readelf -d {0} | grep '\(NEEDED\)' | sed -r 's/.*\[(.*)\]/\\1/'".format(filename)) as f:
|
|
|
+ for line in f:
|
|
|
+ dependency = line.rstrip()
|
|
|
+ if dependency not in libs:
|
|
|
+ libs.append(dependency)
|
|
|
+
|
|
|
+ print("libs:", libswithpath)
|
|
|
+ libsused = set((libswithpath[0],))
|
|
|
+
|
|
|
+ # read all defined symbols
|
|
|
+ syms = {}
|
|
|
+ for filename in libswithpath:
|
|
|
+ for sym in readsymbols(filename, nmopts):
|
|
|
+ if sym["type"] != "U":
|
|
|
+ # TODO: support symbols defined by multiple libs properly, and weak symbols
|
|
|
+ # TODO: more proper handling of symbol versions, see https://maskray.me/blog/2020-11-26-all-about-symbol-versioning
|
|
|
+ if "@@" in sym["name"]:
|
|
|
+ syms[sym["name"].replace("@@", "@")] = {"type": sym["type"], "file": filename}
|
|
|
+ syms[sym["name"].split("@@")[0]] = {"type": sym["type"], "file": filename}
|
|
|
+ else:
|
|
|
+ syms[sym["name"]] = {"type": sym["type"], "file": filename}
|
|
|
+
|
|
|
+ # resolve unresolved
|
|
|
+ for filename in libswithpath:
|
|
|
+ for sym in readsymbols(filename, nmopts):
|
|
|
+ if sym["type"] == "U":
|
|
|
+ resolved = syms.get(sym["name"])
|
|
|
+ if resolved:
|
|
|
+ if filename in libsused:
|
|
|
+ libsused.add(resolved["file"])
|
|
|
+ if printresolved:
|
|
|
+ print("{0:25} {1:25} {2} {3}".format(filename, resolved["file"], resolved["type"], sym["name"]))
|
|
|
+ else:
|
|
|
+ print("{0:25} {1:25} U {2}".format(filename, "UNRESOLVED #####", sym["name"]))
|
|
|
+ else:
|
|
|
+ if printalldefined:
|
|
|
+ print("{0:25} {1}".format(filename, sym["line"]))
|
|
|
+
|
|
|
+ unused = set(libswithpath) - libsused
|
|
|
+ if unused:
|
|
|
+ print("unused:", unused)
|
|
|
+
|
|
|
+
|
|
|
+def findlibraryinpath(filename, searchpath):
|
|
|
+ for d in searchpath.split(os.pathsep):
|
|
|
+ filepath = os.path.join(d, filename)
|
|
|
+ if os.path.isfile(filepath):
|
|
|
+ return filepath
|
|
|
+ return filename
|
|
|
+
|
|
|
+
|
|
|
+"""
|
|
|
+output format of nm:
|
|
|
+00003004 A __bss_start
|
|
|
+ U __cxa_atexit
|
|
|
+"""
|
|
|
+def readsymbol(line):
|
|
|
+ s = line if line[0] == " " else line.lstrip(string.hexdigits)
|
|
|
+ s = s.lstrip()
|
|
|
+ return {"type": s[0], "name": s[2:], "line": line}
|
|
|
+
|
|
|
+
|
|
|
+def readsymbols(filename, nmopts=""):
|
|
|
+ with os.popen("nm -D {0} {1}".format(nmopts, filename)) as f:
|
|
|
+ for line in f:
|
|
|
+ yield readsymbol(line.rstrip())
|
|
|
+
|
|
|
+if __name__ == "__main__":
|
|
|
+ parser = argparse.ArgumentParser(description='Check dynamic linkage consistency by matching defined vs unresolved symbols.')
|
|
|
+ parser.add_argument('files', metavar='FILE', nargs='+', help="a dynamically linked executable or library.")
|
|
|
+ parser.add_argument('-p', '--path', help="Search path for libraries (use like LD_LIBRARY_PATH)")
|
|
|
+ parser.add_argument('-r', '--resolved', action='store_true', help="Print resolved symbols. By default only unresolved symbols are printed.")
|
|
|
+ parser.add_argument('-a', '--alldefined', action='store_true', help="Print all defined symbols")
|
|
|
+ parser.add_argument('-d', '--demangle', action='store_true', help="Demangle C++ names")
|
|
|
+
|
|
|
+ args = parser.parse_args()
|
|
|
+ ldcheck(args.files, args.path, args.alldefined, args.resolved, args.demangle)
|
Samuel kendall
1 an în urmă