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/*
* convert from text form of subnet specification to binary
* 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: ttosubnet.c,v 1.1 2004/03/15 20:35:26 as Exp $
*/
#include "internal.h"
#include "freeswan.h"
#ifndef DEFAULTSUBNET
#define DEFAULTSUBNET "%default"
#endif
/*
- ttosubnet - convert text "addr/mask" to address and mask
* Mask can be integer bit count.
*/
err_t
ttosubnet(src, srclen, af, dst)
const char *src;
size_t srclen; /* 0 means "apply strlen" */
int af; /* AF_INET or AF_INET6 */
ip_subnet *dst;
{
const char *slash;
const char *colon;
const char *mask;
size_t mlen;
const char *oops;
unsigned long bc;
static char def[] = DEFAULTSUBNET;
# define DEFLEN (sizeof(def) - 1) /* -1 for NUL */
static char defis4[] = "0/0";
# define DEFIS4LEN (sizeof(defis4) - 1)
static char defis6[] = "::/0";
# define DEFIS6LEN (sizeof(defis6) - 1)
ip_address addrtmp;
ip_address masktmp;
int nbits;
int i;
if (srclen == 0)
srclen = strlen(src);
if (srclen == 0)
return "empty string";
switch (af) {
case AF_INET:
nbits = 32;
break;
case AF_INET6:
nbits = 128;
break;
default:
return "unknown address family in ttosubnet";
break;
}
if (srclen == DEFLEN && strncmp(src, def, srclen) == 0) {
src = (af == AF_INET) ? defis4 : defis6;
srclen = (af == AF_INET) ? DEFIS4LEN : DEFIS6LEN;
}
slash = memchr(src, '/', srclen);
if (slash == NULL)
return "no / in subnet specification";
mask = slash + 1;
mlen = srclen - (mask - src);
oops = ttoaddr(src, slash-src, af, &addrtmp);
if (oops != NULL)
return oops;
/* extract port */
colon = memchr(mask, ':', mlen);
if (colon == 0)
{
setportof(0, &addrtmp);
}
else
{
long port;
oops = ttoul(colon+1, mlen-(colon-mask+1), 10, &port);
if (oops != NULL)
return oops;
setportof(htons(port), &addrtmp);
mlen = colon - mask;
}
/*extract mask */
oops = ttoul(mask, mlen, 10, &bc);
if (oops == NULL) {
/* ttoul succeeded, it's a bit-count mask */
if (bc > nbits)
return "subnet mask bit count too large";
i = bc;
} else {
oops = ttoaddr(mask, mlen, af, &masktmp);
if (oops != NULL)
return oops;
i = masktocount(&masktmp);
if (i < 0)
return "non-contiguous or otherwise erroneous mask";
}
return initsubnet(&addrtmp, i, '0', dst);
}
#ifdef TTOSUBNET_MAIN
#include <stdio.h>
void regress(void);
int main(int argc, char *argv[])
{
ip_subnet s;
char buf[100];
char buf2[100];
const char *oops;
size_t n;
int af;
char *p;
if (argc < 2) {
fprintf(stderr, "Usage: %s [-6] addr/mask\n", argv[0]);
fprintf(stderr, " or: %s -r\n", argv[0]);
exit(2);
}
if (strcmp(argv[1], "-r") == 0) {
regress();
fprintf(stderr, "regress() returned?!?\n");
exit(1);
}
af = AF_INET;
p = argv[1];
if (strcmp(argv[1], "-6") == 0) {
af = AF_INET6;
p = argv[2];
} else if (strchr(argv[1], ':') != NULL)
af = AF_INET6;
oops = ttosubnet(p, 0, af, &s);
if (oops != NULL) {
fprintf(stderr, "%s: conversion failed: %s\n", argv[0], oops);
exit(1);
}
n = subnettot(&s, 0, buf, sizeof(buf));
if (n > sizeof(buf)) {
fprintf(stderr, "%s: reverse conversion of ", argv[0]);
(void) addrtot(&s.addr, 0, buf2, sizeof(buf2));
fprintf(stderr, "%s/", buf2);
fprintf(stderr, "%d", s.maskbits);
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 *input;
char *output; /* NULL means error expected */
} rtab[] = {
{4, "1.2.3.0/255.255.255.0", "1.2.3.0/24"},
{4, "1.2.3.0/24", "1.2.3.0/24"},
{4, "1.2.3.0/24:10", "1.2.3.0/24:10"},
{4, "1.2.3.0/24:-1", NULL},
{4, "1.2.3.0/24:none", NULL},
{4, "1.2.3.0/24:", NULL},
{4, "1.2.3.0/24:0x10", "1.2.3.0/24:16"},
{4, "1.2.3.0/24:0X10", "1.2.3.0/24:16"},
{4, "1.2.3.0/24:010", "1.2.3.0/24:8"},
{4, "1.2.3.1/255.255.255.240", "1.2.3.0/28"},
{4, "1.2.3.1/32", "1.2.3.1/32"},
{4, "1.2.3.1/0", "0.0.0.0/0"},
/* {4, "1.2.3.1/255.255.127.0", "1.2.3.0/255.255.127.0"}, */
{4, "1.2.3.1/255.255.127.0", NULL},
{4, "128.009.000.032/32", "128.9.0.32/32"},
{4, "128.0x9.0.32/32", NULL},
{4, "0x80090020/32", "128.9.0.32/32"},
{4, "0x800x0020/32", NULL},
{4, "128.9.0.32/0xffFF0000", "128.9.0.0/16"},
{4, "128.9.0.32/0xff0000FF", NULL},
{4, "128.9.0.32/0x0000ffFF", NULL},
{4, "128.9.0.32/0x00ffFF0000", NULL},
{4, "128.9.0.32/0xffFF", NULL},
{4, "128.9.0.32.27/32", NULL},
{4, "128.9.0k32/32", NULL},
{4, "328.9.0.32/32", NULL},
{4, "128.9..32/32", NULL},
{4, "10/8", "10.0.0.0/8"},
{4, "10.0/8", "10.0.0.0/8"},
{4, "10.0.0/8", "10.0.0.0/8"},
{4, "10.0.1/24", "10.0.1.0/24"},
{4, "_", NULL},
{4, "_/_", NULL},
{4, "1.2.3.1", NULL},
{4, "1.2.3.1/_", NULL},
{4, "1.2.3.1/24._", NULL},
{4, "1.2.3.1/99", NULL},
{4, "localhost/32", "127.0.0.1/32"},
{4, "%default", "0.0.0.0/0"},
{6, "3049:1::8007:2040/0", "::/0"},
{6, "3049:1::8007:2040/128", "3049:1::8007:2040/128"},
{6, "3049:1::192.168.0.1/128", NULL}, /*"3049:1::c0a8:1/128",*/
{6, "3049:1::8007::2040/128", NULL},
{6, "3049:1::8007:2040/ffff::0", "3049::/16"},
{6, "3049:1::8007:2040/64", "3049:1::/64"},
{6, "3049:1::8007:2040/ffff::", "3049::/16"},
{6, "3049:1::8007:2040/0000:ffff::0", NULL},
{6, "3049:1::8007:2040/ff1f::0", NULL},
{6, "3049:1::8007:x:2040/128", NULL},
{6, "3049:1t::8007:2040/128", NULL},
{6, "3049:1::80071:2040/128", NULL},
{6, "::/21", "::/21"},
{6, "::1/128", "::1/128"},
{6, "1::/21", "1::/21"},
{6, "1::2/128", "1::2/128"},
{6, "1:0:0:0:0:0:0:2/128", "1::2/128"},
{6, "1:0:0:0:3:0:0:2/128", "1::3:0:0:2/128"},
{6, "1:0:0:3:0:0:0:2/128", "1::3:0:0:0:2/128"},
{6, "1:0:3:0:0:0:0:2/128", "1:0:3::2/128"},
{6, "abcd:ef01:2345:6789:0:00a:000:20/128", "abcd:ef01:2345:6789:0:a:0:20/128"},
{6, "3049:1::8007:2040/ffff:ffff:", NULL},
{6, "3049:1::8007:2040/ffff:88::", NULL},
{6, "3049:12::9000:3200/ffff:fff0::", "3049:10::/28"},
{6, "3049:12::9000:3200/28", "3049:10::/28"},
{6, "3049:12::9000:3200/ff00:::", NULL},
{6, "3049:12::9000:3200/ffff:::", NULL},
{6, "3049:12::9000:3200/128_", NULL},
{6, "3049:12::9000:3200/", NULL},
{6, "%default", "::/0"},
{4, NULL, NULL}
};
void
regress(void)
{
struct rtab *r;
int status = 0;
ip_subnet s;
char in[100];
char buf[100];
const char *oops;
size_t n;
int af;
for (r = rtab; r->input != NULL; r++) {
af = (r->family == 4) ? AF_INET : AF_INET6;
strcpy(in, r->input);
oops = ttosubnet(in, 0, af, &s);
if (oops != NULL && r->output == NULL)
{} /* okay, error expected */
else if (oops != NULL) {
printf("`%s' ttosubnet failed: %s\n", r->input, oops);
status = 1;
} else if (r->output == NULL) {
printf("`%s' ttosubnet succeeded unexpectedly\n",
r->input);
status = 1;
} else {
n = subnettot(&s, 0, buf, sizeof(buf));
if (n > sizeof(buf)) {
printf("`%s' subnettot failed: need %ld\n",
r->input, (long)n);
status = 1;
} else if (strcmp(r->output, buf) != 0) {
printf("`%s' gave `%s', expected `%s'\n",
r->input, buf, r->output);
status = 1;
}
}
}
exit(status);
}
#endif /* TTOSUBNET_MAIN */
|
