Add a new 'include' keyword to syslog.conf

[bapt]

Summary

the include keyword is looking at non hidden '.conf' files in the directory
specified in argument.

If the directory does not exist it is simply ignored

It simplies usage of syslogd with automation tools as well as allowing packages
to provide samples syslog configuration files

Change the default config to look for configuration files in /etc/syslog.d and
/usr/local/etc/syslog.d

[bapt]

Add /etc/syslog.d in mtree

[bapt]

Ensure 'include' is followed by a space to be taken in account (reported by kib)
Fix some debug printing

[bapt]

Use static string and sizeof as requested by kib

[emaste]

I know @markj likes syslogd

[bapt]

more sizeof

[bapt]

Check the return of snprintf

[bapt]

Test the result of scandir(3) and print it in debug output

[markj]

usr.sbin/syslogd/syslog.conf.5

67

maybe "all files with names ending in '.conf' and not beginning with a '.' contained in the directory following the keyword."?

usr.sbin/syslogd/syslogd.c

1663

Why not do this check in the select routine for scandir too?

1678

This will crash if a config file includes the directory it's in.

[bapt]

Reword manpage
Prevent 'include' recursion
Move then entire configfile detection into the select for scandir

[bapt]

Plig memory leak

[markj]

usr.sbin/syslogd/syslogd.c

1659

This works, but the restriction should be noted in the syslog.conf man page. I think newsyslog is more complete and actually detects include cycles.

1692

You can add a "continue" to the nents == -1 case above to avoid the conditional here.

[wblock]

usr.sbin/syslogd/syslog.conf.5

67

Sorry for the late response. This explanation is still not that clear. Suggestion below. Also, this really needs an example in the man page.

The
.Em include 
keyword includes all files with names ending in
.Pa .conf
from the directory name following the keyword.
Filenames that begin with a single dot
.Pa \&. 
are ignored.