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/*
* convert from ASCII form of subnet specification to binary
* Copyright (C) 1998, 1999 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: atosubnet.c 3265 2007-10-08 19:52:55Z andreas $
*/
#include "internal.h"
#include "freeswan.h"
#ifndef DEFAULTSUBNET
#define DEFAULTSUBNET "%default"
#endif
/*
- atosubnet - convert ASCII "addr/mask" to address and mask
* Mask can be integer bit count.
*/
const char * /* NULL for success, else string literal */
atosubnet(src, srclen, addrp, maskp)
const char *src;
size_t srclen; /* 0 means "apply strlen" */
struct in_addr *addrp;
struct in_addr *maskp;
{
const char *slash;
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 defis[] = "0/0";
# define DEFILEN (sizeof(defis) - 1)
if (srclen == 0)
srclen = strlen(src);
if (srclen == 0)
return "empty string";
if (srclen == DEFLEN && strncmp(src, def, srclen) == 0) {
src = defis;
srclen = DEFILEN;
}
slash = memchr(src, '/', srclen);
if (slash == NULL)
return "no / in subnet specification";
mask = slash + 1;
mlen = srclen - (mask - src);
oops = atoaddr(src, slash-src, addrp);
if (oops != NULL)
return oops;
oops = atoul(mask, mlen, 10, &bc);
if (oops == NULL) {
/* atoul succeeded, it's a bit-count mask */
if (bc > ABITS)
return "bit-count mask too large";
#ifdef NOLEADINGZEROS
if (mlen > 1 && *mask == '0')
return "octal not allowed in mask";
#endif /* NOLEADINGZEROS */
*maskp = bitstomask((int)bc);
} else {
oops = atoaddr(mask, mlen, maskp);
if (oops != NULL)
return oops;
if (!goodmask(*maskp))
return "non-contiguous mask";
}
addrp->s_addr &= maskp->s_addr;
return NULL;
}
#ifdef ATOSUBNET_MAIN
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
void regress(void);
int
main(int argc, char *argv[])
{
struct in_addr a;
struct in_addr m;
char buf[100];
const char *oops;
size_t n;
if (argc < 2) {
fprintf(stderr, "Usage: %s {addr/mask|-r}\n", argv[0]);
exit(2);
}
if (strcmp(argv[1], "-r") == 0) {
regress();
fprintf(stderr, "regress() returned?!?\n");
exit(1);
}
oops = atosubnet(argv[1], 0, &a, &m);
if (oops != NULL) {
fprintf(stderr, "%s: conversion failed: %s\n", argv[0], oops);
exit(1);
}
n = subnettoa(a, m, 0, buf, sizeof(buf));
if (n > sizeof(buf)) {
fprintf(stderr, "%s: reverse conversion of ", argv[0]);
fprintf(stderr, "%s/", inet_ntoa(a));
fprintf(stderr, "%s", inet_ntoa(m));
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 {
char *input;
char *output; /* NULL means error expected */
} rtab[] = {
{"1.2.3.0/255.255.255.0", "1.2.3.0/24"},
{"1.2.3.0/24", "1.2.3.0/24"},
{"1.2.3.1/255.255.255.240", "1.2.3.0/28"},
{"1.2.3.1/32", "1.2.3.1/32"},
{"1.2.3.1/0", "0.0.0.0/0"},
/* "1.2.3.1/255.255.127.0", "1.2.3.0/255.255.127.0", */
{"1.2.3.1/255.255.127.0", NULL},
{"128.009.000.032/32", "128.9.0.32/32"},
{"128.0x9.0.32/32", NULL},
{"0x80090020/32", "128.9.0.32/32"},
{"0x800x0020/32", NULL},
{"128.9.0.32/0xffFF0000", "128.9.0.0/16"},
{"128.9.0.32/0xff0000FF", NULL},
{"128.9.0.32/0x0000ffFF", NULL},
{"128.9.0.32/0x00ffFF0000", NULL},
{"128.9.0.32/0xffFF", NULL},
{"128.9.0.32.27/32", NULL},
{"128.9.0k32/32", NULL},
{"328.9.0.32/32", NULL},
{"128.9..32/32", NULL},
{"10/8", "10.0.0.0/8"},
{"10.0/8", "10.0.0.0/8"},
{"10.0.0/8", "10.0.0.0/8"},
{"10.0.1/24", "10.0.1.0/24"},
{"_", NULL},
{"_/_", NULL},
{"1.2.3.1", NULL},
{"1.2.3.1/_", NULL},
{"1.2.3.1/24._", NULL},
{"1.2.3.1/99", NULL},
{"localhost/32", "127.0.0.1/32"},
{"%default", "0.0.0.0/0"},
{NULL, NULL}
};
void
regress()
{
struct rtab *r;
int status = 0;
struct in_addr a;
struct in_addr m;
char in[100];
char buf[100];
const char *oops;
size_t n;
for (r = rtab; r->input != NULL; r++) {
strcpy(in, r->input);
oops = atosubnet(in, 0, &a, &m);
if (oops != NULL && r->output == NULL)
{} /* okay, error expected */
else if (oops != NULL) {
printf("`%s' atosubnet failed: %s\n", r->input, oops);
status = 1;
} else if (r->output == NULL) {
printf("`%s' atosubnet succeeded unexpectedly\n",
r->input);
status = 1;
} else {
n = subnettoa(a, m, 0, buf, sizeof(buf));
if (n > sizeof(buf)) {
printf("`%s' subnettoa 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 /* ATOSUBNET_MAIN */
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