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Re^4: Net::Ping IPv6 Support

by tlhackque (Sexton)
on Feb 11, 2013 at 12:14 UTC ( #1018130=note: print w/replies, xml ) Need Help??


in reply to Re^3: Net::Ping IPv6 Support
in thread Net::Ping IPv6 Support

Sorry to see no progress. Perhaps this will help (I added it to the CPAN bug report):

With respect to the questions about the patch:

A quick search turns up the source for ping6 at http://cvsweb.netbsd.org/bsdweb.cgi/src/sbin/ping6/ping6.c?rev=1.81&content-type=text/x-cvsweb-markup&only_with_tag=MAIN

Checksum:

The header checksum field is initialized to zero, but not computed - I assume (but haven't dug in) that sendmsg computes.

Source address:

When no explicit interface is bound, the source address is determined by indirectly consulting the routing tables - a UDP socket is connect()ed and getsockname() called. Look for the code under if (!(options & F_SRCADDR))

Hope this helps.

This communication may not represent my employer's views, if any, on the matters discussed.

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[davido]: so last -f /var/run/utmp on ubuntu provides similar (though more verbose) info
[oiskuu]: glibc getlogin just does ttyname() and falls back on getutline(); it's not security related at all. (reminds me of sendmail and remote finger services of the naive early spam era)
[Corion]: But yes, "who started this process" is interesting information :)
[tye]: no, I really believe that "login user" was added as a fundamental bit of info about each process in order to enhance the usefulness of auditing
[Corion]: Ah - if that information is saved in a file, then you could theoretically spam that file and confuse getlogin(). So, don't use it for authentication :)
[tye]: that is what getlogin() certainly *used* to do. I don't believe that is what it certainly should do.
[davido]: /var/run/utmp is 664 i think.
[tye]: Note that my "man getlogin" says that it uses stdin when it should use /dev/tty (calling a glibc bug). But that does not appear to be the case when I test it. But maybe Perl's getlogin() is not using glibc's getlogin().
[oiskuu]: well, run a strace and see what the getlogin does for you.... As I said. SELinux probably has those security labels. But not regular linux.
[tye]: for example, read https://unix. stackexchange.com/ questions/146138/ loginuid-should-be -allowed-to-change -or-not-mutable-or -not

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