Netinfo - Protocol, service, network, host and ether info
Directions to find it at Stu
Netinfo version 0.5, October 2009.
Netinfo version 0.4, September 2007.
2009-01-03 Stu TkNib (Tk Netinfo Browser, included with Netinfo) is a GUI frontend to Netinfo. TkNib loads and displays all available information from the five system databases supported by Netinfo. Columns can be sorted by clicking on their headers. It's a very simple program; an example of working with Netinfo, Ttk, Tk and Tcl. Thanks to dkf's widget demo for the sort proc.
2009-10-01 Stu I removed TkNib from this page; it's included with Netinfo.
Netinfo is also the name of a OS subsystem handling these issues in NEXTSTEP and MacOS X. What relation, if any, is there between that and Stu's package?
Stu sez: No relationship. I was unaware of the NEXTSTEP and MacOS X subsystem until now. Netinfo was originally called Netutil but it turned out to be more info-ish than util-ish. Do you think this will cause any problems? Netinfo 0.3 was released a year ago and I haven't had any complains although I have no idea if anyone is using it.
One example of usage would be to look up hostnames (usually taken from /etc/hosts) using Netinfo and creating sockets (aka ceps) using Ceptcl and the -noresolve option. This way, one can avoid the potential delays caused by the operating system looking up the hostname.
From the man page:
The netinfo Tcl extension provides access to system proto-
col, service, network, host and ether information which is
retrieved from system databases and made available for
querying. This functionality is somewhat analogous to
that provided by some of the functions referenced in the
C include file usually found on unix-like oper-
ating systems (gethostbyname, getservbyport, etc). Unlike
those functions, netinfo does not go beyond referencing
the data stored in the system databases; netinfo does not
access the databases per query, rather it loads the data
and parses it into an internal ready-for-querying format.
If any changes are made to the databases after loading
then the affected databases would need to be reloaded if
the changes are to be available to netinfo queries.
Normal usage involves optionally specifying any database
files if the defaults do not match your reality, calling
as many of the "load" commands as are necessary (depending
on what data you need to access; netinfo does not load
anything at startup) and using the querying and extraction
commands to retrieve info.Examples:
# Results noted with #=>
package require netinfo
namespace import ::netinfo::*
loadProtocolData; loadServiceData; loadNetworkData; loadHostData; loadEtherData
protocolData [protocol -number 123] -comment
#=> Performance Transparency Protocol
protocolData [protocol -number 123] -comment -name
#=> {Performance Transparency Protocol} ptp
service -port 9
#=> discard 9 {sink null} {} tcp
service -port 9 -protocol udp
#=> discard 9 {sink null} {} udp
service -port 9 -protocol *
#=> {discard 9 {sink null} {} tcp} {discard 9 {sink null} {} udp}
serviceData [lindex [service -port 9 -protocol *] 1] -protocol -port
#=> udp 9
network -number 127
#=> loopback loop {} 127
networkData [network -number 224] -name
#=> BASE-ADDRESS.MCAST.NET
hostData [host -aliases localhost] -address
#=> 127.0.0.1
hostData [host -aliases localhost -domain inet6] -address
#=> ::1
etherData [ether -name toaster] -address
#=> 00:01:6a:e3:df:0a
# List all services:
service -name *