/* * 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 . * * 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 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 */