small tcp_wrappers issue (argus-3.0.0.rc.10)

[Andreas Östling]

I don't think this issue is new but I just noticed it when trying 
argus-3.0.0.rc.10. The check for tcp_wrappers fails on some systems as 
some versions of tcp_wrappers requires allow_severity/deny_severity to 
be defined when linking. Example with argus-3.0.0.rc.10 on OpenBSD 3.9 
even though it has libwrap by default: 

checking for system tcp_wrappers library... checking for main in 
-lwrap... no
configure: WARNING: tcp_wrapper not found

From config.log:
configure:6999: checking for system tcp_wrappers library
configure:7001: checking for main in -lwrap
configure:7025: gcc -o conftest -g -O2   conftest.c -lwrap    -lpcap >&5
/usr/lib/libwrap.so.4.0: undefined reference to `allow_severity'
/usr/lib/libwrap.so.4.0: undefined reference to `deny_severity'
collect2: ld returned 1 exit status

By adding this to the conftest program:
int deny_severity = 0;    
int allow_severity = 0;

tcp_wrappers will be detected correctly:
checking for system tcp_wrappers library... checking for main in 
-lwrap... yes
 
and seems to work:
argus[10605]: 22 Jun 06 12:38:09.360765 refused connect from localhost
argus[10605]: 22 Jun 06 12:38:09.361116 ArgusCheckClientStatus: 
ArgusTcpWrapper rejects

Same thing goes for argus-clients I guess.

/Andreas