297 lines
7.5 KiB
C
297 lines
7.5 KiB
C
/*
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* convert from text form of subnet specification to binary
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* Copyright (C) 2000 Henry Spencer.
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Library General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/lgpl.txt>.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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* License for more details.
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*
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* RCSID $Id: ttosubnet.c,v 1.1 2004/03/15 20:35:26 as Exp $
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*/
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#include "internal.h"
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#include "freeswan.h"
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#ifndef DEFAULTSUBNET
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#define DEFAULTSUBNET "%default"
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#endif
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/*
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- ttosubnet - convert text "addr/mask" to address and mask
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* Mask can be integer bit count.
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*/
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err_t
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ttosubnet(src, srclen, af, dst)
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const char *src;
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size_t srclen; /* 0 means "apply strlen" */
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int af; /* AF_INET or AF_INET6 */
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ip_subnet *dst;
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{
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const char *slash;
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const char *colon;
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const char *mask;
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size_t mlen;
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const char *oops;
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unsigned long bc;
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static char def[] = DEFAULTSUBNET;
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# define DEFLEN (sizeof(def) - 1) /* -1 for NUL */
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static char defis4[] = "0/0";
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# define DEFIS4LEN (sizeof(defis4) - 1)
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static char defis6[] = "::/0";
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# define DEFIS6LEN (sizeof(defis6) - 1)
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ip_address addrtmp;
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ip_address masktmp;
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int nbits;
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int i;
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if (srclen == 0)
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srclen = strlen(src);
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if (srclen == 0)
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return "empty string";
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switch (af) {
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case AF_INET:
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nbits = 32;
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break;
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case AF_INET6:
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nbits = 128;
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break;
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default:
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return "unknown address family in ttosubnet";
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break;
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}
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if (srclen == DEFLEN && strncmp(src, def, srclen) == 0) {
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src = (af == AF_INET) ? defis4 : defis6;
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srclen = (af == AF_INET) ? DEFIS4LEN : DEFIS6LEN;
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}
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slash = memchr(src, '/', srclen);
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if (slash == NULL)
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return "no / in subnet specification";
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mask = slash + 1;
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mlen = srclen - (mask - src);
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oops = ttoaddr(src, slash-src, af, &addrtmp);
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if (oops != NULL)
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return oops;
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/* extract port */
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colon = memchr(mask, ':', mlen);
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if (colon == 0)
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{
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setportof(0, &addrtmp);
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}
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else
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{
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long port;
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oops = ttoul(colon+1, mlen-(colon-mask+1), 10, &port);
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if (oops != NULL)
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return oops;
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setportof(htons(port), &addrtmp);
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mlen = colon - mask;
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}
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/*extract mask */
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oops = ttoul(mask, mlen, 10, &bc);
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if (oops == NULL) {
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/* ttoul succeeded, it's a bit-count mask */
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if (bc > nbits)
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return "subnet mask bit count too large";
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i = bc;
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} else {
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oops = ttoaddr(mask, mlen, af, &masktmp);
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if (oops != NULL)
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return oops;
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i = masktocount(&masktmp);
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if (i < 0)
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return "non-contiguous or otherwise erroneous mask";
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}
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return initsubnet(&addrtmp, i, '0', dst);
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}
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#ifdef TTOSUBNET_MAIN
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#include <stdio.h>
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void regress(void);
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int main(int argc, char *argv[])
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{
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ip_subnet s;
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char buf[100];
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char buf2[100];
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const char *oops;
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size_t n;
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int af;
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char *p;
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if (argc < 2) {
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fprintf(stderr, "Usage: %s [-6] addr/mask\n", argv[0]);
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fprintf(stderr, " or: %s -r\n", argv[0]);
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exit(2);
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}
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if (strcmp(argv[1], "-r") == 0) {
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regress();
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fprintf(stderr, "regress() returned?!?\n");
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exit(1);
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}
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af = AF_INET;
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p = argv[1];
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if (strcmp(argv[1], "-6") == 0) {
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af = AF_INET6;
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p = argv[2];
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} else if (strchr(argv[1], ':') != NULL)
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af = AF_INET6;
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oops = ttosubnet(p, 0, af, &s);
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if (oops != NULL) {
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fprintf(stderr, "%s: conversion failed: %s\n", argv[0], oops);
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exit(1);
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}
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n = subnettot(&s, 0, buf, sizeof(buf));
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if (n > sizeof(buf)) {
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fprintf(stderr, "%s: reverse conversion of ", argv[0]);
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(void) addrtot(&s.addr, 0, buf2, sizeof(buf2));
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fprintf(stderr, "%s/", buf2);
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fprintf(stderr, "%d", s.maskbits);
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fprintf(stderr, " failed: need %ld bytes, have only %ld\n",
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(long)n, (long)sizeof(buf));
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exit(1);
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}
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printf("%s\n", buf);
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exit(0);
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}
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struct rtab {
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int family;
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char *input;
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char *output; /* NULL means error expected */
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} rtab[] = {
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{4, "1.2.3.0/255.255.255.0", "1.2.3.0/24"},
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{4, "1.2.3.0/24", "1.2.3.0/24"},
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{4, "1.2.3.0/24:10", "1.2.3.0/24:10"},
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{4, "1.2.3.0/24:-1", NULL},
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{4, "1.2.3.0/24:none", NULL},
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{4, "1.2.3.0/24:", NULL},
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{4, "1.2.3.0/24:0x10", "1.2.3.0/24:16"},
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{4, "1.2.3.0/24:0X10", "1.2.3.0/24:16"},
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{4, "1.2.3.0/24:010", "1.2.3.0/24:8"},
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{4, "1.2.3.1/255.255.255.240", "1.2.3.0/28"},
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{4, "1.2.3.1/32", "1.2.3.1/32"},
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{4, "1.2.3.1/0", "0.0.0.0/0"},
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/* {4, "1.2.3.1/255.255.127.0", "1.2.3.0/255.255.127.0"}, */
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{4, "1.2.3.1/255.255.127.0", NULL},
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{4, "128.009.000.032/32", "128.9.0.32/32"},
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{4, "128.0x9.0.32/32", NULL},
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{4, "0x80090020/32", "128.9.0.32/32"},
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{4, "0x800x0020/32", NULL},
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{4, "128.9.0.32/0xffFF0000", "128.9.0.0/16"},
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{4, "128.9.0.32/0xff0000FF", NULL},
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{4, "128.9.0.32/0x0000ffFF", NULL},
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{4, "128.9.0.32/0x00ffFF0000", NULL},
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{4, "128.9.0.32/0xffFF", NULL},
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{4, "128.9.0.32.27/32", NULL},
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{4, "128.9.0k32/32", NULL},
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{4, "328.9.0.32/32", NULL},
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{4, "128.9..32/32", NULL},
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{4, "10/8", "10.0.0.0/8"},
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{4, "10.0/8", "10.0.0.0/8"},
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{4, "10.0.0/8", "10.0.0.0/8"},
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{4, "10.0.1/24", "10.0.1.0/24"},
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{4, "_", NULL},
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{4, "_/_", NULL},
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{4, "1.2.3.1", NULL},
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{4, "1.2.3.1/_", NULL},
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{4, "1.2.3.1/24._", NULL},
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{4, "1.2.3.1/99", NULL},
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{4, "localhost/32", "127.0.0.1/32"},
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{4, "%default", "0.0.0.0/0"},
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{6, "3049:1::8007:2040/0", "::/0"},
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{6, "3049:1::8007:2040/128", "3049:1::8007:2040/128"},
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{6, "3049:1::192.168.0.1/128", NULL}, /*"3049:1::c0a8:1/128",*/
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{6, "3049:1::8007::2040/128", NULL},
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{6, "3049:1::8007:2040/ffff::0", "3049::/16"},
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{6, "3049:1::8007:2040/64", "3049:1::/64"},
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{6, "3049:1::8007:2040/ffff::", "3049::/16"},
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{6, "3049:1::8007:2040/0000:ffff::0", NULL},
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{6, "3049:1::8007:2040/ff1f::0", NULL},
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{6, "3049:1::8007:x:2040/128", NULL},
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{6, "3049:1t::8007:2040/128", NULL},
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{6, "3049:1::80071:2040/128", NULL},
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{6, "::/21", "::/21"},
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{6, "::1/128", "::1/128"},
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{6, "1::/21", "1::/21"},
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{6, "1::2/128", "1::2/128"},
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{6, "1:0:0:0:0:0:0:2/128", "1::2/128"},
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{6, "1:0:0:0:3:0:0:2/128", "1::3:0:0:2/128"},
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{6, "1:0:0:3:0:0:0:2/128", "1::3:0:0:0:2/128"},
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{6, "1:0:3:0:0:0:0:2/128", "1:0:3::2/128"},
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{6, "abcd:ef01:2345:6789:0:00a:000:20/128", "abcd:ef01:2345:6789:0:a:0:20/128"},
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{6, "3049:1::8007:2040/ffff:ffff:", NULL},
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{6, "3049:1::8007:2040/ffff:88::", NULL},
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{6, "3049:12::9000:3200/ffff:fff0::", "3049:10::/28"},
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{6, "3049:12::9000:3200/28", "3049:10::/28"},
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{6, "3049:12::9000:3200/ff00:::", NULL},
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{6, "3049:12::9000:3200/ffff:::", NULL},
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{6, "3049:12::9000:3200/128_", NULL},
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{6, "3049:12::9000:3200/", NULL},
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{6, "%default", "::/0"},
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{4, NULL, NULL}
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};
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void
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regress(void)
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{
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struct rtab *r;
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int status = 0;
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ip_subnet s;
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char in[100];
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char buf[100];
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const char *oops;
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size_t n;
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int af;
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for (r = rtab; r->input != NULL; r++) {
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af = (r->family == 4) ? AF_INET : AF_INET6;
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strcpy(in, r->input);
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oops = ttosubnet(in, 0, af, &s);
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if (oops != NULL && r->output == NULL)
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{} /* okay, error expected */
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else if (oops != NULL) {
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printf("`%s' ttosubnet failed: %s\n", r->input, oops);
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status = 1;
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} else if (r->output == NULL) {
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printf("`%s' ttosubnet succeeded unexpectedly\n",
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r->input);
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status = 1;
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} else {
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n = subnettot(&s, 0, buf, sizeof(buf));
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if (n > sizeof(buf)) {
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printf("`%s' subnettot failed: need %ld\n",
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r->input, (long)n);
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status = 1;
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} else if (strcmp(r->output, buf) != 0) {
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printf("`%s' gave `%s', expected `%s'\n",
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r->input, buf, r->output);
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status = 1;
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}
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}
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}
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exit(status);
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}
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#endif /* TTOSUBNET_MAIN */
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