Issues with ComeOnIn (BCrypt - more specifically bcrypt_nif.so)

[William Dunne]

To start with, running Ubuntu 14.10 latest Erlang, Elixir, and ComeOnIn. x64 intel system, yadayada

I have been trying to use ComeOnIn in a different package for password hashing but unfortunately I am unable to get it compile. The error I get is bellow:

comeonin/priv/bcrypt_nif.so: cannot open shared object file: No such file

To take it a step further, I went into the c dependencies folder and attempted to compile the bcrypt_nif.c file myself however I then had the issue of a bcrypt_nif.h file being missing.

I have tried a few different things, like using the IRCCloud fork of bcrypt-erl, but still no avail.

Anyone have any idea as to what is causing this, or more importantly how I can fix it?

[Josh Adams]

comeonin/priv/bcrypt_nif.so: cannot open shared object file: No such file

 

So this basically just means "hey, a thing that the compilation of comeonin should have created wasn't there!"

To take it a step further, I went into the c dependencies folder and attempted to compile the bcrypt_nif.c file myself however I then had the issue of a bcrypt_nif.h file being missing.

At the top level of comeonin is a Makefile (https://github.com/elixircnx/comeonin/blob/master/Makefile).  It describes how to build that nif.  Can you cd into the dependency's directory, type `make priv/bcrypt_nif.so`, and post the results here?

[William Dunne]

Thanks Josh, this was the result:

make priv/bcrypt_nif.socc -g -O3 -Wall -I/usr/lib/erlang/erts-6.3/include -Ic_src -fPIC -shared  -o priv/bcrypt_nif.so c_src/bcrypt_nif.c c_src/bcrypt.c c_src/blowfish.c
c_src/bcrypt_nif.c:22:21: fatal error: erl_nif.h: No such file or directory
 #include "erl_nif.h"
                     ^
compilation terminated.
Makefile:23: recipe for target 'priv/bcrypt_nif.so' failed
make: *** [priv/bcrypt_nif.so] Error 1

[Josh Adams]

On Tue, Mar 24, 2015 at 8:44 AM, William Dunne <wil...@mimex.net> wrote:

Thanks Josh, this was the result:

make priv/bcrypt_nif.socc -g -O3 -Wall -I/usr/lib/erlang/erts-6.3/include -Ic_src -fPIC -shared  -o priv/bcrypt_nif.so c_src/bcrypt_nif.c c_src/bcrypt.c c_src/blowfish.c
c_src/bcrypt_nif.c:22:21: fatal error: erl_nif.h: No such file or directory
 #include "erl_nif.h"
                     ^
compilation terminated.
Makefile:23: recipe for target 'priv/bcrypt_nif.so' failed
make: *** [priv/bcrypt_nif.so] Error 1

Now we're getting somewhere.  OK, so your problem was that the `make` statement failed to find the erl_nif.h file at /usr/lib/erlang/erts-6.3/include

I haven't a clue why exactly you're missing the erl_nif header file, but if it were in that location this would compile successfully.  You can see how the ComeOnIn Makefile derives this location - perhaps you have an incomplete erlang install?  There's some reason it thinks it's installed in /usr/lib/erlang.

[William Dunne]

Interesting, I installed it via the standard apt-get method. Any clue how to fix this?

[Josh Adams]

Yeah, `apt-get install erlang-dev`

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Josh Adams

[William Dunne]

Sorted :D

[David Whitlock]

Hi, I'm the maintainer of Comeonin. I'm glad to see you got the problem sorted.
For future reference, it might be advisable to download Erlang from the erlang-solutions site as the version of Erlang from the Ubuntu repositories is quite old (17.1). This might be relevant in a month or two, as we're hoping to implement some changes which depend on version 17.3.