gsmaccess.5

手机短消息的服务器端和客户端的源代码 是应用于LINUX/UNIX开发环境的

.TH GSMACCESS 5 "Project SMSLink" "Les Ateliers du Heron" \" -*- nroff -*-
.SH NAME
gsmaccess \- SMSLink server access control list file
.SH DESCRIPTION
.B gsmaccess
is an ASCII file which contains entries (rules) defining potential
client's access rights to the server (in simple terms of allow / deny).
Each rule will qualify as an "allow" or a "deny" rule, specifying the
network number or individual IP address to which the rule apply and a
subnet mask expressed as a single decimal digit.
.PP
There is one entry per line, and each line has the format:
.sp
.RS
access:network/netmask
.RE
.sp
Lines beginning with '#' are treated as comments and ignored. Empty
lines are allowed and ignored. Invalid entries are silently ignored.
.sp
The field descriptions are:
.sp
.RS
.TP 1.0in
.I access
a single character, either 'n'
.RB "(=" deny ")"
or 'y'
.RB "(=" allow ")."
The presence of this character is required. It is not case-sensitive.
.TP
.I network
a network number or IP address expressed as a dotted quad.
.TP
.I netmask
a subnet mask expressed as a single decimal value (representing the
number of bits set in the mask). A mask of
.B 32
would mean that the preceeding dotted quad represented an individual
IP address.
.SH SECURITY POLICY
If the file
.B /etc/gsmaccess
exists and can be read, the policy is to enable access control (even if the
file is empty or doesn't contain any valid rule), and to deny access by
default. All rules contained in the file are parsed in their successive
order, and the first to match the client's IP address applies. When no
match can be found, access is denied by default. To revert the policy to
a "default allow", use only negative rules and set "y:0.0.0.0/0" as the
last one.
.PP
When the file is absent, the access control is disabled altogether.
.SH EXAMPLES
.B y:0.0.0.0/0
.br
grants access to anyone.
.PP
.B y:192.1.1.0/24
.br
.B n:192.1.1.7/32
.br
grants access to anyone on the 192.1.1.0 subnet with mask 255.255.255.0
but specifically denies access to the machine whose IP address is
192.1.1.7.
.PP
.B n:192.1.1.0/24
.br
.B n:192.1.2.0/24
.br
.B y:0.0.0.0/0
.br
closes access to a few networks and opens it to anything else.
.SH FILES
.B /etc/gsmaccess
.SH SEE ALSO
.BR sms_serv "(1), " sendsms "(1), " gsmdevices "(5)"