On Nov 10, 2003, at 6:59 AM, Loïc Minier wrote:
[ I'm controlling a tethereal subprocess from a Java program and I
wonder in which charset the output of "tethereal -D" is encoded under
Windows, and under unices. ]
The order in which whatever mechanism supplies the list of interfaces
supplies them.
The mechanism is OS-dependent, and version-of-Ethereal and
version-of-libpcap-dependent on at least some platforms (on Linux,
older versions of Ethereal always used SIOCGIFCONF, but that only
returned interfaces that had IP addresses; newer versions of Ethereal
will use "pcap_findalldevs()", if present in libpcap, and that will
probably use "/proc/net/dev", if present, unless the Linux system has
"getifaddrs()", in which case it'll use that).
There are no guarantees as to the order in which they're returned,
except that it'll put UNIX-style loopback interfaces at the end.
I wonder if there is a specific format a programmer might expect for
the output (besides the number of the interface followed by a dot and
a space).
No. That output is intended for humans, and is subject to change.
Is there another source for this listing as tethereal?
With newer versions of libpcap/WinPcap, there's "pcap_findalldevs()".
I don't know whether any of the Java interfaces to libpcap/WinPcap,
such as jpcap, support it. They probably should (and should fall back
on the mechanisms "pcap_findalldevs()" uses, if "pcap_findalldevs()"
itself isn't present).
Is there a way to get separate listings for the interfaces names,
their
description, and their number?
Not in Tethereal.
Also, I'm disappointed that different versions of tethereal won't
output the list in the same interface order.
See above.
Last question, why ain't there any "any" interface under windows?
For the same reason that there isn't an "any" interface on any other
non-Linux platform. The way the Linux capture mechanism works, it's
possible to say "show me packets" without specifying an interface on
which to capture packets; that means that you get packets from all
interfaces. Other OSes don't happen to work that way.
