ELF Binary information extraction

Library symbol listing

nm -C /PATH/TO/STATIC/LIBRARY/lib.a

comm-c0761e06ea036fdd.comm14-e1f6fa1b765f1060a1adaa86eb00af21.rs.rcgu.o:
0000000000000000 T c_die
0000000000000000 T c_drop_message
0000000000000000 T c_get_target
0000000000000000 T c_init
0000000000000000 T c_poll
0000000000000000 T c_recv
0000000000000000 T c_recv_fd
0000000000000000 T c_send
0000000000000000 T c_send_fd
0000000000000000 T c_set_role

Symbol types are one of the two types most of the time, but more exist, of course.

"T" / "t": The symbol is in the text (code) section.
"U" / "u:" The symbol is undefined.

Source: https://linux.die.net/man/1/nm

nm -C /PATH/TO/OBJECT/FILE/lib.cpp.o

                 U sleep
                 U __stack_chk_fail
0000000000000000 T threadOne
0000000000000000 T threadTwo
                 U c_set_role(long)
                 U c_get_target()
                 U c_drop_message(Message*)
                 U c_init(long)
                 U c_recv()
                 U c_send(long, char const*, char const*)

Library Infornation dump (General):

Static library file contents

ar -t lib.a

Library Symbol listing

nm lib.a

Symbol listing w/ C++ name mangling

nm -C lib.a

ELF architecture dump and more

objdump -f lib.a

Shared library dependencies

ldd -r -v libnanomsg.so readelf -d libnanomsg.so | grep NEEDED

$ readelf -d lib.so | grep NEEDED
 0x0000000000000001 (NEEDED)             Shared library: [libnanomsg.so.5]
 0x0000000000000001 (NEEDED)             Shared library: [libdl.so]
 0x0000000000000001 (NEEDED)             Shared library: [librt.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libgcc_s.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so]

$ readelf -d  libnanomsg.so | grep NEEDED
 0x0000000000000001 (NEEDED)             Shared library: [libdl.so]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so]

Dynamic listing of process/executable dependencies / loaded shared libraries

• sudo awk '/\.so/{print $6}' /proc/<PID>/maps | sort -u
• strace -e trace=open <BINARY-EXECUTABLE>
• lsof -p <PID> | grep mem

 0x0000000000000001 (NEEDED)             Shared library: [libdl.so]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so]
 0x000000000000000e (SONAME)             Library soname: [libnanomsg.so.5]