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1 | /* | |
2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. | |
3 | * | |
4 | * @APPLE_LICENSE_HEADER_START@ | |
5 | * | |
6 | * The contents of this file constitute Original Code as defined in and | |
7 | * are subject to the Apple Public Source License Version 1.1 (the | |
8 | * "License"). You may not use this file except in compliance with the | |
9 | * License. Please obtain a copy of the License at | |
10 | * http://www.apple.com/publicsource and read it before using this file. | |
11 | * | |
12 | * This Original Code and all software distributed under the License are | |
13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the | |
17 | * License for the specific language governing rights and limitations | |
18 | * under the License. | |
19 | * | |
20 | * @APPLE_LICENSE_HEADER_END@ | |
21 | */ | |
22 | /* | |
23 | * Copyright (c) 1983, 1993 | |
24 | * The Regents of the University of California. All rights reserved. | |
25 | * | |
26 | * Redistribution and use in source and binary forms, with or without | |
27 | * modification, are permitted provided that the following conditions | |
28 | * are met: | |
29 | * 1. Redistributions of source code must retain the above copyright | |
30 | * notice, this list of conditions and the following disclaimer. | |
31 | * 2. Redistributions in binary form must reproduce the above copyright | |
32 | * notice, this list of conditions and the following disclaimer in the | |
33 | * documentation and/or other materials provided with the distribution. | |
34 | * 3. All advertising materials mentioning features or use of this software | |
35 | * must display the following acknowledgement: | |
36 | * This product includes software developed by the University of | |
37 | * California, Berkeley and its contributors. | |
38 | * 4. Neither the name of the University nor the names of its contributors | |
39 | * may be used to endorse or promote products derived from this software | |
40 | * without specific prior written permission. | |
41 | * | |
42 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
43 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
44 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
45 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
46 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
47 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
48 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
49 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
50 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
51 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
52 | * SUCH DAMAGE. | |
53 | */ | |
54 | ||
55 | ||
56 | #include <sys/param.h> | |
57 | #include <netinet/in.h> | |
58 | #include <arpa/inet.h> | |
59 | ||
60 | /* | |
61 | * Return the network number from an internet | |
62 | * address; handles class a/b/c network #'s. | |
63 | */ | |
64 | u_long | |
65 | inet_netof(in) | |
66 | struct in_addr in; | |
67 | { | |
68 | register u_long i = ntohl(in.s_addr); | |
69 | ||
70 | if (IN_CLASSA(i)) | |
71 | return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT); | |
72 | else if (IN_CLASSB(i)) | |
73 | return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT); | |
74 | else | |
75 | return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT); | |
76 | } |