libcasper: Create a minimal cap_netdb service

[freqlabs]

Summary

Create a casper service for netdb functions.
Initially only cap_getprotobyname is implemented.

I'm working on capsicumizing sockstat and needed this one.

[bcr]

OK from manpages.

[kevans]

lib/libcasper/services/cap_netdb/Makefile

10

SHLIB_MAJOR should probably start at 1 for a new lib.

lib/libcasper/services/cap_netdb/tests/Makefile

15

This test compiles fine with the default WARNS... as a matter of fact, all the casper service tests seem to compile with the default WARNS, which makes me wonder if it was for crufty GCC. This can be dropped at any rate. =-)

lib/libcasper/services/cap_netdb/tests/netdb_test.c

68

Consider spelling this as ATF_TC_WITHOUT_HEAD instead and dropping the empty ATF_TC_HEAD below.

[freqlabs]

Incorporate feedback

[freqlabs]

I wonder if this should be incorporated as part of cap_net (D24688) instead?

[oshogbo]

I would prefer to commit this version. Sorry for me not responding for a while.

[oshogbo]

lib/libcasper/services/cap_netdb/cap_netdb.c

51

if pp == NULL return ?

62

Maybe we can consume nvlist_t here?
Instead of strdup just use take?

67

Why we start by free?

137

What if name won't be send?

[gbe]

Small nit for the copyright section of the man page.

lib/libcasper/services/cap_netdb/cap_netdb.3

3

The "All rights reserved." should be dropped.

[freqlabs]

Address feedback

[freqlabs]

@oshogbo okay to commit?

[oshogbo]

LGTM.
Do you have commit bit or should I commit this?