1 |
1026 |
ivang |
.\" Copyright (c) 1983, 1991, 1993
|
2 |
|
|
.\" The Regents of the University of California. All rights reserved.
|
3 |
|
|
.\"
|
4 |
|
|
.\" Redistribution and use in source and binary forms, with or without
|
5 |
|
|
.\" modification, are permitted provided that the following conditions
|
6 |
|
|
.\" are met:
|
7 |
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
8 |
|
|
.\" notice, this list of conditions and the following disclaimer.
|
9 |
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
10 |
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
11 |
|
|
.\" documentation and/or other materials provided with the distribution.
|
12 |
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
13 |
|
|
.\" must display the following acknowledgement:
|
14 |
|
|
.\" This product includes software developed by the University of
|
15 |
|
|
.\" California, Berkeley and its contributors.
|
16 |
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
17 |
|
|
.\" may be used to endorse or promote products derived from this software
|
18 |
|
|
.\" without specific prior written permission.
|
19 |
|
|
.\"
|
20 |
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
21 |
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
22 |
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
23 |
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
24 |
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
25 |
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
26 |
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
27 |
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
28 |
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
29 |
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
30 |
|
|
.\" SUCH DAMAGE.
|
31 |
|
|
.\"
|
32 |
|
|
.\" @(#)getnetent.3 8.1 (Berkeley) 6/4/93
|
33 |
|
|
.\" getnetent.3,v 1.2 1998/08/20 21:56:23 joel Exp
|
34 |
|
|
.\"
|
35 |
|
|
.Dd June 4, 1993
|
36 |
|
|
.Dt GETNETENT 3
|
37 |
|
|
.Os BSD 4.2
|
38 |
|
|
.Sh NAME
|
39 |
|
|
.Nm getnetent ,
|
40 |
|
|
.Nm getnetbyaddr ,
|
41 |
|
|
.Nm getnetbyname ,
|
42 |
|
|
.Nm setnetent ,
|
43 |
|
|
.Nm endnetent
|
44 |
|
|
.Nd get network entry
|
45 |
|
|
.Sh SYNOPSIS
|
46 |
|
|
.Fd #include
|
47 |
|
|
.Ft struct netent *
|
48 |
|
|
.Fn getnetent void
|
49 |
|
|
.Ft struct netent *
|
50 |
|
|
.Fn getnetbyname "const char *name"
|
51 |
|
|
.Ft struct netent *
|
52 |
|
|
.Fn getnetbyaddr "unsigned long net" "int type"
|
53 |
|
|
.Ft void
|
54 |
|
|
.Fn setnetent "int stayopen"
|
55 |
|
|
.Ft void
|
56 |
|
|
.Fn endnetent void
|
57 |
|
|
.Sh DESCRIPTION
|
58 |
|
|
The
|
59 |
|
|
.Fn getnetent ,
|
60 |
|
|
.Fn getnetbyname ,
|
61 |
|
|
and
|
62 |
|
|
.Fn getnetbyaddr
|
63 |
|
|
functions
|
64 |
|
|
each return a pointer to an object with the
|
65 |
|
|
following structure
|
66 |
|
|
containing the broken-out
|
67 |
|
|
fields of a line in the network data base,
|
68 |
|
|
.Pa /etc/networks .
|
69 |
|
|
.Bd -literal -offset indent
|
70 |
|
|
struct netent {
|
71 |
|
|
char *n_name; /* official name of net */
|
72 |
|
|
char **n_aliases; /* alias list */
|
73 |
|
|
int n_addrtype; /* net number type */
|
74 |
|
|
unsigned long n_net; /* net number */
|
75 |
|
|
};
|
76 |
|
|
.Ed
|
77 |
|
|
.Pp
|
78 |
|
|
The members of this structure are:
|
79 |
|
|
.Bl -tag -width n_addrtype
|
80 |
|
|
.It Fa n_name
|
81 |
|
|
The official name of the network.
|
82 |
|
|
.It Fa n_aliases
|
83 |
|
|
A zero terminated list of alternate names for the network.
|
84 |
|
|
.It Fa n_addrtype
|
85 |
|
|
The type of the network number returned; currently only AF_INET.
|
86 |
|
|
.It Fa n_net
|
87 |
|
|
The network number. Network numbers are returned in machine byte
|
88 |
|
|
order.
|
89 |
|
|
.El
|
90 |
|
|
.Pp
|
91 |
|
|
The
|
92 |
|
|
.Fn getnetent
|
93 |
|
|
function
|
94 |
|
|
reads the next line of the file, opening the file if necessary.
|
95 |
|
|
.Pp
|
96 |
|
|
The
|
97 |
|
|
.Fn setnetent
|
98 |
|
|
function
|
99 |
|
|
opens and rewinds the file. If the
|
100 |
|
|
.Fa stayopen
|
101 |
|
|
flag is non-zero,
|
102 |
|
|
the net data base will not be closed after each call to
|
103 |
|
|
.Fn getnetbyname
|
104 |
|
|
or
|
105 |
|
|
.Fn getnetbyaddr .
|
106 |
|
|
.Pp
|
107 |
|
|
The
|
108 |
|
|
.Fn endnetent
|
109 |
|
|
function
|
110 |
|
|
closes the file.
|
111 |
|
|
.Pp
|
112 |
|
|
The
|
113 |
|
|
.Fn getnetbyname
|
114 |
|
|
function
|
115 |
|
|
and
|
116 |
|
|
.Fn getnetbyaddr
|
117 |
|
|
sequentially search from the beginning
|
118 |
|
|
of the file until a matching
|
119 |
|
|
net name or
|
120 |
|
|
net address and type is found,
|
121 |
|
|
or until
|
122 |
|
|
.Dv EOF
|
123 |
|
|
is encountered. The
|
124 |
|
|
.Fa type
|
125 |
|
|
must be
|
126 |
|
|
.Dv AF_INET .
|
127 |
|
|
Network numbers are supplied in host order.
|
128 |
|
|
.Sh FILES
|
129 |
|
|
.Bl -tag -width /etc/networks -compact
|
130 |
|
|
.It Pa /etc/networks
|
131 |
|
|
.El
|
132 |
|
|
.Sh DIAGNOSTICS
|
133 |
|
|
Null pointer
|
134 |
|
|
(0) returned on
|
135 |
|
|
.Dv EOF
|
136 |
|
|
or error.
|
137 |
|
|
.Sh SEE ALSO
|
138 |
|
|
.Xr networks 5
|
139 |
|
|
.Pp
|
140 |
|
|
.%T RFC 1101
|
141 |
|
|
.Sh HISTORY
|
142 |
|
|
The
|
143 |
|
|
.Fn getnetent ,
|
144 |
|
|
.Fn getnetbyaddr ,
|
145 |
|
|
.Fn getnetbyname ,
|
146 |
|
|
.Fn setnetent ,
|
147 |
|
|
and
|
148 |
|
|
.Fn endnetent
|
149 |
|
|
functions appeared in
|
150 |
|
|
.Bx 4.2 .
|
151 |
|
|
.Sh BUGS
|
152 |
|
|
The data space used by
|
153 |
|
|
these functions is static; if future use requires the data, it should be
|
154 |
|
|
copied before any subsequent calls to these functions overwrite it.
|
155 |
|
|
Only Internet network
|
156 |
|
|
numbers are currently understood.
|
157 |
|
|
Expecting network numbers to fit
|
158 |
|
|
in no more than 32 bits is probably
|
159 |
|
|
naive.
|