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rubyffiaerospikeruby-ffi
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Reputation: 614

GENERAL_NAME_free error when using Aerospike from Ruby

I am trying to create a simple shared library libfoo.so which opens a connection to Aerospike server using a single function, waits for 3 seconds and closes the connection. libfoo.so has a single function open_then_close(char* host, int port).

Then I want to invoke this function from Ruby using FFI: 

require 'ffi'

module Aerospike
  extend FFI::Library
  ffi_lib  "./libfoo.so", "libaerospike.so"
  attach_function :connect_then_close, [:string, :int], :int
end

puts Aerospike.connect_then_close("127.0.0.1", 3000)

I tested foolib.so using a C program, it works fine. However when I try to run the above code I get the following error:

Could not open library '/usr/lib/libaerospike.so': /usr/lib/libaerospike.so: undefined symbol: GENERAL_NAME_free (LoadError)

Additional info:

$ ldd /usr/lib/libaerospike.so
    linux-vdso.so.1 =>  (0x00007ffe413cb000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f2ec87a3000)
    /lib64/ld-linux-x86-64.so.2 (0x00005645069a7000)

$ nm -u /usr/lib/libaerospike.so | grep GENERAL_NAME_free
       U GENERAL_NAME_free

Any idea what is wrong?

UPDATE

$ dpkg -l | grep libgcrypt
  ii  libgcrypt11:amd64       1.5.3-2ubuntu4.3        amd64        LGPL Crypto library - runtime library

$ locate libcrypto
  /lib/x86_64-linux-gnu/libcrypto.so.1.0.0
  /usr/lib/x86_64-linux-gnu/libcrypto.a
  /usr/lib/x86_64-linux-gnu/libcrypto.so
  /usr/lib/x86_64-linux-gnu/pkgconfig/libcrypto.pc

This is how I compiled and created libfoo.so

$ gcc -Wall -c -fPIC foo.c -o foo.o -laerospike -lssl -lcrypto -lpthread -lm -lz

Linking the wrong way:

$ gcc -shared -o libfoo.so foo.o

Upvotes: 1

Views: 1110

Answers (1)

Jan Hecking
Jan Hecking

Reputation: 949

It looks like the symbol GENERAL_NAME_free is defined by OpenSSL's crypto library according to this man page and this OpenSSL forum post. So you are probably missing the libcrypto library.

But I'm curious, why you are using the Aerospike C client library for your Ruby program instead of using the Aerospike Ruby client? Is there some specific functionality in the C client that is missing from the Ruby client?

Upvotes: 2

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