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