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1996-05-08
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Sinetd documentation - 1 May 1996
Copyright (c) 1996, Charles Honton.
All rights reserved.
Sinetd is an internet "super server" daemon with enhanced domain
security. Much like inetd, sinetd launches tcp servers on an
as-needed basis. Unlike inetd, there is a check of the client
address to determine if the client is allowed access to the service.
Sinetd uses lines in the sinetd.lst file to determine which services
are provided and what clients are allowed to use each service.
sinetd.lst resides in the ETC directory. Each line in the file
describes a single tcp service. Blank lines and any characters
following an octothorp ('#') are ignored.
The first word in each entry is the name of the service. The second
word is the program which is launched to provide the service. The
remaining words on the line are access specifiers. If there are no
access specifiers, access is allowed for any client. If there are
any access specifiers, access is allowed for any client which matches
at least one of the specifiers.
Access specifiers can either be domain names or dot notation. Domain
names are matched from right to left, so if a client is attempting to
connect from somewhere.company.com and one of the service access
specifiers is company.com, access will be granted. If this same
client attempts to connect to a service with the single access
specifier elsewhere.company.com, access will be denied.
Dot notation specifiers are matched left to right. If a client
attempts a connect from interface 192.0.29.42 to a service with the
single access specifier 192.0.30, access will be denied. If the same
client attempts a connect to a service with the specifier 192, access
will be granted.
When access is granted the service program is launched in a new
session with the name specified followed by the decimal number of the
tcp socket which has been connected to the client. The service
program should close the socket once the tcp conversation is
completed.
Sinetd is not freeware. It is Copyrighted material and the author
requests the following machine licence fees:
#computers Fee
1 $20
2 $40
8 $60
16 $80
32 $100
64 $120
128 $140
256 $160
All fees should be sent to:
Charles Honton
c/o Secant Technologies
23811 Chagrin Blvd.
Beachwood, OH 44120
Comments and suggestions are appreciated.
Direct all inquiries to chas@secant.com