my struggle with the build system

[David Huss]

Hi,

I am trying to add argon2-support to the rlm_pap module in v3.0 of 
freeradius. argon2 is a modern password hashing algorithm that our (art 
university) LDAP uses. Now we were under the (obviously wrong) 
assumption that any program would send the cleartext password to our 
LDAP and ask it for a thumbs-up/down. Hence the need to add the hashing 
function.

I think I am fine in terms of the code, but am fighting a bit with the 
build system.

Does anybody have pointers where I would add the dependencies? I didn't 
find any documentation on that and my learnings from looking at other 
modules was somewhat limited. My first hunch was to add them to 
src/includes and to src/includes/all.mk but then I realized all the 
implementation C-files are located at src/lib

So I tried the following:
- adding argon.h to src/includes/argon.h
- adding argon.h to src/includes/all.mk
- adding all of the argon.h dependencies to src/includes as well
- adding argon.c to src/lib/argon.c
- adding argon.c to src/lib.all.mk
- adding all of the argon.c dependencies (.c-files) to src/lib

This does not work as the linker fails to find some functions from the 
argon.c dependencies:

/usr/bin/ld: build/lib/local/.libs/libfreeradius-radius.so: undefined 
reference to `fill_memory_blocks'
/usr/bin/ld: build/lib/local/.libs/libfreeradius-radius.so: undefined 
reference to `finalize'
/usr/bin/ld: build/lib/local/.libs/libfreeradius-radius.so: undefined 
reference to `clear_internal_memory'
/usr/bin/ld: build/lib/local/.libs/libfreeradius-radius.so: undefined 
reference to `numlen'
/usr/bin/ld: build/lib/local/.libs/libfreeradius-radius.so: undefined 
reference to `validate_inputs'
/usr/bin/ld: build/lib/local/.libs/libfreeradius-radius.so: undefined 
reference to `initialize'
/usr/bin/ld: build/lib/local/.libs/libfreeradius-radius.so: undefined 
reference to `decode_string'
/usr/bin/ld: build/lib/local/.libs/libfreeradius-radius.so: undefined 
reference to `b64len'
/usr/bin/ld: build/lib/local/.libs/libfreeradius-radius.so: undefined 
reference to `encode_string'

Is there a correct way of adding those dependencies? Forgive my 
C-noob-question..

All the best from Hamburg,
David Huss


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