112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
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/*++
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/* NAME
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/* mynetworks 3
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/* SUMMARY
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/* generate patterns for my own interface addresses
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/* SYNOPSIS
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/* #include <mynetworks.h>
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/*
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/* const char *mynetworks()
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/* DESCRIPTION
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/* This routine uses the address list built by own_inet_addr()
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/* to produce a list of patterns that match the corresponding
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/* networks. The patterns are conservative: they match whole
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/* class A, B, C or D networks. This is usually sufficient to
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/* distinguish between organizations.
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/* LICENSE
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/* .ad
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/* .fi
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/* The Secure Mailer license must be distributed with this software.
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/* AUTHOR(S)
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/* Wietse Venema
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/* IBM T.J. Watson Research
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/* P.O. Box 704
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/* Yorktown Heights, NY 10598, USA
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/*--*/
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/* System library. */
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#include <sys_defs.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#ifndef IN_CLASSD_NET
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#define IN_CLASSD_NET 0xf0000000
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#define IN_CLASSD_NSHIFT 28
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#endif
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#define BITS_PER_ADDR 32
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/* Utility library. */
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#include <msg.h>
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#include <vstring.h>
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#include <inet_addr_list.h>
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/* Global library. */
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#include <own_inet_addr.h>
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#include <mynetworks.h>
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/* mynetworks - return patterns that match my own networks */
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const char *mynetworks(void)
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{
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static VSTRING *result;
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if (result == 0) {
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char *myname = "mynetworks";
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INET_ADDR_LIST *my_addr_list;
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unsigned long addr;
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unsigned long mask;
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struct in_addr net;
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int shift;
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int i;
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result = vstring_alloc(20);
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my_addr_list = own_inet_addr_list();
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for (i = 0; i < my_addr_list->used; i++) {
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addr = ntohl(my_addr_list->addrs[i].s_addr);
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if (IN_CLASSA(addr)) {
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mask = IN_CLASSA_NET;
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shift = IN_CLASSA_NSHIFT;
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} else if (IN_CLASSB(addr)) {
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mask = IN_CLASSB_NET;
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shift = IN_CLASSB_NSHIFT;
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} else if (IN_CLASSC(addr)) {
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mask = IN_CLASSC_NET;
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shift = IN_CLASSC_NSHIFT;
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} else if (IN_CLASSD(addr)) {
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mask = IN_CLASSD_NET;
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shift = IN_CLASSD_NSHIFT;
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} else {
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msg_fatal("%s: bad address class: %s",
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myname, inet_ntoa(my_addr_list->addrs[i]));
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}
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net.s_addr = htonl(addr & mask);
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vstring_sprintf_append(result, "%s/%d ",
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inet_ntoa(net), BITS_PER_ADDR - shift);
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}
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if (msg_verbose)
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msg_info("%s: %s", myname, vstring_str(result));
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}
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return (vstring_str(result));
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}
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#ifdef TEST
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char *var_inet_interfaces;
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main(int argc, char **argv)
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{
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if (argc != 2)
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msg_fatal("usage: %s interface_list", argv[0]);
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msg_verbose = 10;
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var_inet_interfaces = argv[1];
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mynetworks();
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}
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#endif
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