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/*
* express an address range as a subnet (if possible)
* Copyright (C) 2000 Henry Spencer.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/lgpl.txt>.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
* License for more details.
*
* RCSID $Id: rangetosubnet.c,v 1.9 2004/04/09 18:00:36 mcr Exp $
*/
#include "internal.h"
#include "openswan.h"
/*
- rangetosubnet - turn an address range into a subnet, if possible
*
* A range which is a valid subnet will have a network part which is the
* same in the from value and the to value, followed by a host part which
* is all 0 in the from value and all 1 in the to value.
*/
err_t
rangetosubnet(from, to, dst)
const ip_address *from;
const ip_address *to;
ip_subnet *dst;
{
unsigned const char *fp;
unsigned const char *tp;
unsigned fb;
unsigned tb;
unsigned const char *f;
unsigned const char *t;
size_t n;
size_t n2;
int i;
int nnet;
unsigned m;
if (addrtypeof(from) != addrtypeof(to))
return "mismatched address types";
n = addrbytesptr(from, &fp);
if (n == 0)
return "unknown address type";
n2 = addrbytesptr(to, &tp);
if (n != n2)
return "internal size mismatch in rangetosubnet";
f = fp;
t = tp;
nnet = 0;
for (i = n; i > 0 && *f == *t; i--, f++, t++)
nnet += 8;
if (i > 0 && !(*f == 0x00 && *t == 0xff)) { /* mid-byte bdry. */
fb = *f++;
tb = *t++;
i--;
m = 0x80;
while ((fb&m) == (tb&m)) {
fb &= ~m;
tb |= m;
m >>= 1;
nnet++;
}
if (fb != 0x00 || tb != 0xff)
return "not a valid subnet";
}
for (; i > 0 && *f == 0x00 && *t == 0xff; i--, f++, t++)
continue;
if (i != 0)
return "invalid subnet";
return initsubnet(from, nnet, 'x', dst);
}
#ifdef RANGETOSUBNET_MAIN
#include <stdio.h>
void regress(void);
int
main(int argc, char *argv[])
{
ip_address start;
ip_address stop;
ip_subnet sub;
char buf[100];
const char *oops;
size_t n;
int af;
int i;
if (argc == 2 && strcmp(argv[1], "-r") == 0) {
regress();
fprintf(stderr, "regress() returned?!?\n");
exit(1);
}
if (argc < 3) {
fprintf(stderr, "Usage: %s [-6] start stop\n", argv[0]);
fprintf(stderr, " or: %s -r\n", argv[0]);
exit(2);
}
af = AF_INET;
i = 1;
if (strcmp(argv[i], "-6") == 0) {
af = AF_INET6;
i++;
}
oops = ttoaddr(argv[i], 0, af, &start);
if (oops != NULL) {
fprintf(stderr, "%s: start conversion failed: %s\n", argv[0], oops);
exit(1);
}
oops = ttoaddr(argv[i+1], 0, af, &stop);
if (oops != NULL) {
fprintf(stderr, "%s: stop conversion failed: %s\n", argv[0], oops);
exit(1);
}
oops = rangetosubnet(&start, &stop, &sub);
if (oops != NULL) {
fprintf(stderr, "%s: rangetosubnet failed: %s\n", argv[0], oops);
exit(1);
}
n = subnettot(&sub, 0, buf, sizeof(buf));
if (n > sizeof(buf)) {
fprintf(stderr, "%s: reverse conversion", argv[0]);
fprintf(stderr, " failed: need %ld bytes, have only %ld\n",
(long)n, (long)sizeof(buf));
exit(1);
}
printf("%s\n", buf);
exit(0);
}
struct rtab {
int family;
char *start;
char *stop;
char *output; /* NULL means error expected */
} rtab[] = {
{4, "1.2.3.0", "1.2.3.255", "1.2.3.0/24"},
{4, "1.2.3.0", "1.2.3.7", "1.2.3.0/29"},
{4, "1.2.3.240", "1.2.3.255", "1.2.3.240/28"},
{4, "0.0.0.0", "255.255.255.255", "0.0.0.0/0"},
{4, "1.2.3.4", "1.2.3.4", "1.2.3.4/32"},
{4, "1.2.3.0", "1.2.3.254", NULL},
{4, "1.2.3.0", "1.2.3.126", NULL},
{4, "1.2.3.0", "1.2.3.125", NULL},
{4, "1.2.0.0", "1.2.255.255", "1.2.0.0/16"},
{4, "1.2.0.0", "1.2.0.255", "1.2.0.0/24"},
{4, "1.2.255.0", "1.2.255.255", "1.2.255.0/24"},
{4, "1.2.255.0", "1.2.254.255", NULL},
{4, "1.2.255.1", "1.2.255.255", NULL},
{4, "1.2.0.1", "1.2.255.255", NULL},
{6, "1:2:3:4:5:6:7:0", "1:2:3:4:5:6:7:ffff", "1:2:3:4:5:6:7:0/112"},
{6, "1:2:3:4:5:6:7:0", "1:2:3:4:5:6:7:fff", "1:2:3:4:5:6:7:0/116"},
{6, "1:2:3:4:5:6:7:f0", "1:2:3:4:5:6:7:ff", "1:2:3:4:5:6:7:f0/124"},
{4, NULL, NULL, NULL},
};
void
regress()
{
struct rtab *r;
int status = 0;
ip_address start;
ip_address stop;
ip_subnet sub;
char buf[100];
const char *oops;
size_t n;
int af;
for (r = rtab; r->start != NULL; r++) {
af = (r->family == 4) ? AF_INET : AF_INET6;
oops = ttoaddr(r->start, 0, af, &start);
if (oops != NULL) {
printf("surprise failure converting `%s'\n", r->start);
exit(1);
}
oops = ttoaddr(r->stop, 0, af, &stop);
if (oops != NULL) {
printf("surprise failure converting `%s'\n", r->stop);
exit(1);
}
oops = rangetosubnet(&start, &stop, &sub);
if (oops != NULL && r->output == NULL)
{} /* okay, error expected */
else if (oops != NULL) {
printf("`%s'-`%s' rangetosubnet failed: %s\n",
r->start, r->stop, oops);
status = 1;
} else if (r->output == NULL) {
printf("`%s'-`%s' rangetosubnet succeeded unexpectedly\n",
r->start, r->stop);
status = 1;
} else {
n = subnettot(&sub, 0, buf, sizeof(buf));
if (n > sizeof(buf)) {
printf("`%s'-`%s' subnettot failed: need %ld\n",
r->start, r->stop, (long)n);
status = 1;
} else if (strcmp(r->output, buf) != 0) {
printf("`%s'-`%s' gave `%s', expected `%s'\n",
r->start, r->stop, buf, r->output);
status = 1;
}
}
}
exit(status);
}
#endif /* RANGETOSUBNET_MAIN */
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