/* $NetBSD: netaddr.c,v 1.11 2020/05/25 20:47:20 christos Exp $ */ /* * Copyright (C) 2004, 2005, 2007, 2010-2012 Internet Systems Consortium, Inc. ("ISC") * Copyright (C) 1999-2002 Internet Software Consortium. * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ /* Id */ /*! \file */ #include #include #include #include #include #include #include #include #include #include #include "ntp_stdlib.h" /* NTP change for strlcpy, strlcat */ isc_boolean_t isc_netaddr_equal(const isc_netaddr_t *a, const isc_netaddr_t *b) { REQUIRE(a != NULL && b != NULL); if (a->family != b->family) return (ISC_FALSE); if (a->zone != b->zone) return (ISC_FALSE); switch (a->family) { case AF_INET: if (a->type.in.s_addr != b->type.in.s_addr) return (ISC_FALSE); break; case AF_INET6: if (memcmp(&a->type.in6, &b->type.in6, sizeof(a->type.in6)) != 0 || a->zone != b->zone) return (ISC_FALSE); break; #ifdef ISC_PLATFORM_HAVESYSUNH case AF_UNIX: if (strcmp(a->type.un, b->type.un) != 0) return (ISC_FALSE); break; #endif default: return (ISC_FALSE); } return (ISC_TRUE); } isc_boolean_t isc_netaddr_eqprefix(const isc_netaddr_t *a, const isc_netaddr_t *b, unsigned int prefixlen) { const unsigned char *pa = NULL, *pb = NULL; unsigned int ipabytes = 0; /* Length of whole IP address in bytes */ unsigned int nbytes; /* Number of significant whole bytes */ unsigned int nbits; /* Number of significant leftover bits */ REQUIRE(a != NULL && b != NULL); if (a->family != b->family) return (ISC_FALSE); if (a->zone != b->zone && b->zone != 0) return (ISC_FALSE); switch (a->family) { case AF_INET: pa = (const unsigned char *) &a->type.in; pb = (const unsigned char *) &b->type.in; ipabytes = 4; break; case AF_INET6: pa = (const unsigned char *) &a->type.in6; pb = (const unsigned char *) &b->type.in6; ipabytes = 16; break; default: return (ISC_FALSE); } /* * Don't crash if we get a pattern like 10.0.0.1/9999999. */ if (prefixlen > ipabytes * 8) prefixlen = ipabytes * 8; nbytes = prefixlen / 8; nbits = prefixlen % 8; if (nbytes > 0) { if (memcmp(pa, pb, nbytes) != 0) return (ISC_FALSE); } if (nbits > 0) { unsigned int bytea, byteb, mask; INSIST(nbytes < ipabytes); INSIST(nbits < 8); bytea = pa[nbytes]; byteb = pb[nbytes]; mask = (0xFF << (8-nbits)) & 0xFF; if ((bytea & mask) != (byteb & mask)) return (ISC_FALSE); } return (ISC_TRUE); } isc_result_t isc_netaddr_totext(const isc_netaddr_t *netaddr, isc_buffer_t *target) { char abuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; char zbuf[sizeof("%4294967295")]; unsigned int alen; int zlen; const char *r; const void *type; REQUIRE(netaddr != NULL); switch (netaddr->family) { case AF_INET: type = &netaddr->type.in; break; case AF_INET6: type = &netaddr->type.in6; break; #ifdef ISC_PLATFORM_HAVESYSUNH case AF_UNIX: alen = strlen(netaddr->type.un); if (alen > isc_buffer_availablelength(target)) return (ISC_R_NOSPACE); isc_buffer_putmem(target, (const unsigned char *)(netaddr->type.un), alen); return (ISC_R_SUCCESS); #endif default: return (ISC_R_FAILURE); } r = inet_ntop(netaddr->family, type, abuf, sizeof(abuf)); if (r == NULL) return (ISC_R_FAILURE); alen = (unsigned int)strlen(abuf); /* no overflow possible */ INSIST(alen < sizeof(abuf)); zlen = 0; if (netaddr->family == AF_INET6 && netaddr->zone != 0) { zlen = snprintf(zbuf, sizeof(zbuf), "%%%u", netaddr->zone); if (zlen < 0) return (ISC_R_FAILURE); INSIST((unsigned int)zlen < sizeof(zbuf)); } if (alen + zlen > isc_buffer_availablelength(target)) return (ISC_R_NOSPACE); isc_buffer_putmem(target, (unsigned char *)abuf, alen); isc_buffer_putmem(target, (unsigned char *)zbuf, zlen); return (ISC_R_SUCCESS); } void isc_netaddr_format(const isc_netaddr_t *na, char *array, unsigned int size) { isc_result_t result; isc_buffer_t buf; isc_buffer_init(&buf, array, size); result = isc_netaddr_totext(na, &buf); if (size == 0) return; /* * Null terminate. */ if (result == ISC_R_SUCCESS) { if (isc_buffer_availablelength(&buf) >= 1) isc_buffer_putuint8(&buf, 0); else result = ISC_R_NOSPACE; } if (result != ISC_R_SUCCESS) { snprintf(array, size, "<%s %u>", isc_msgcat_get(isc_msgcat, ISC_MSGSET_NETADDR, ISC_MSG_UNKNOWNADDR, "unknown address, family"), na->family); array[size - 1] = '\0'; } } isc_result_t isc_netaddr_prefixok(const isc_netaddr_t *na, unsigned int prefixlen) { static const unsigned char zeros[16] = { 0 }; unsigned int nbits, nbytes, ipbytes = 0; const unsigned char *p; switch (na->family) { case AF_INET: p = (const unsigned char *) &na->type.in; ipbytes = 4; if (prefixlen > 32) return (ISC_R_RANGE); break; case AF_INET6: p = (const unsigned char *) &na->type.in6; ipbytes = 16; if (prefixlen > 128) return (ISC_R_RANGE); break; default: return (ISC_R_NOTIMPLEMENTED); } nbytes = prefixlen / 8; nbits = prefixlen % 8; if (nbits != 0) { if ((p[nbytes] & (0xff>>nbits)) != 0U) return (ISC_R_FAILURE); nbytes++; } if (memcmp(p + nbytes, zeros, ipbytes - nbytes) != 0) return (ISC_R_FAILURE); return (ISC_R_SUCCESS); } isc_result_t isc_netaddr_masktoprefixlen(const isc_netaddr_t *s, unsigned int *lenp) { unsigned int nbits = 0, nbytes = 0, ipbytes = 0, i; const unsigned char *p; switch (s->family) { case AF_INET: p = (const unsigned char *) &s->type.in; ipbytes = 4; break; case AF_INET6: p = (const unsigned char *) &s->type.in6; ipbytes = 16; break; default: return (ISC_R_NOTIMPLEMENTED); } for (i = 0; i < ipbytes; i++) { if (p[i] != 0xFF) break; } nbytes = i; if (i < ipbytes) { unsigned int c = p[nbytes]; while ((c & 0x80) != 0 && nbits < 8) { c <<= 1; nbits++; } if ((c & 0xFF) != 0) return (ISC_R_MASKNONCONTIG); i++; } for (; i < ipbytes; i++) { if (p[i] != 0) return (ISC_R_MASKNONCONTIG); } *lenp = nbytes * 8 + nbits; return (ISC_R_SUCCESS); } void isc_netaddr_fromin(isc_netaddr_t *netaddr, const struct in_addr *ina) { memset(netaddr, 0, sizeof(*netaddr)); netaddr->family = AF_INET; netaddr->type.in = *ina; } void isc_netaddr_fromin6(isc_netaddr_t *netaddr, const struct in6_addr *ina6) { memset(netaddr, 0, sizeof(*netaddr)); netaddr->family = AF_INET6; netaddr->type.in6 = *ina6; } isc_result_t isc_netaddr_frompath(isc_netaddr_t *netaddr, const char *path) { #ifdef ISC_PLATFORM_HAVESYSUNH if (strlen(path) > sizeof(netaddr->type.un) - 1) return (ISC_R_NOSPACE); memset(netaddr, 0, sizeof(*netaddr)); netaddr->family = AF_UNIX; strlcpy(netaddr->type.un, path, sizeof(netaddr->type.un)); netaddr->zone = 0; return (ISC_R_SUCCESS); #else UNUSED(netaddr); UNUSED(path); return (ISC_R_NOTIMPLEMENTED); #endif } void isc_netaddr_setzone(isc_netaddr_t *netaddr, isc_uint32_t zone) { /* we currently only support AF_INET6. */ REQUIRE(netaddr->family == AF_INET6); netaddr->zone = zone; } isc_uint32_t isc_netaddr_getzone(const isc_netaddr_t *netaddr) { return (netaddr->zone); } void isc_netaddr_fromsockaddr(isc_netaddr_t *t, const isc_sockaddr_t *s) { int family = s->type.sa.sa_family; t->family = family; switch (family) { case AF_INET: t->type.in = s->type.sin.sin_addr; t->zone = 0; break; case AF_INET6: memcpy(&t->type.in6, &s->type.sin6.sin6_addr, 16); #ifdef ISC_PLATFORM_HAVESCOPEID t->zone = s->type.sin6.sin6_scope_id; #else t->zone = 0; #endif break; #ifdef ISC_PLATFORM_HAVESYSUNH case AF_UNIX: memcpy(t->type.un, s->type.sunix.sun_path, sizeof(t->type.un)); t->zone = 0; break; #endif default: INSIST(0); } } void isc_netaddr_any(isc_netaddr_t *netaddr) { memset(netaddr, 0, sizeof(*netaddr)); netaddr->family = AF_INET; netaddr->type.in.s_addr = INADDR_ANY; } void isc_netaddr_any6(isc_netaddr_t *netaddr) { memset(netaddr, 0, sizeof(*netaddr)); netaddr->family = AF_INET6; netaddr->type.in6 = in6addr_any; } isc_boolean_t isc_netaddr_ismulticast(isc_netaddr_t *na) { switch (na->family) { case AF_INET: return (ISC_TF(ISC_IPADDR_ISMULTICAST(na->type.in.s_addr))); case AF_INET6: return (ISC_TF(IN6_IS_ADDR_MULTICAST(&na->type.in6))); default: return (ISC_FALSE); /* XXXMLG ? */ } } isc_boolean_t isc_netaddr_isexperimental(isc_netaddr_t *na) { switch (na->family) { case AF_INET: return (ISC_TF(ISC_IPADDR_ISEXPERIMENTAL(na->type.in.s_addr))); default: return (ISC_FALSE); /* XXXMLG ? */ } } isc_boolean_t isc_netaddr_islinklocal(isc_netaddr_t *na) { switch (na->family) { case AF_INET: return (ISC_FALSE); case AF_INET6: return (ISC_TF(IN6_IS_ADDR_LINKLOCAL(&na->type.in6))); default: return (ISC_FALSE); } } isc_boolean_t isc_netaddr_issitelocal(isc_netaddr_t *na) { switch (na->family) { case AF_INET: return (ISC_FALSE); case AF_INET6: return (ISC_TF(IN6_IS_ADDR_SITELOCAL(&na->type.in6))); default: return (ISC_FALSE); } } void isc_netaddr_fromv4mapped(isc_netaddr_t *t, const isc_netaddr_t *s) { isc_netaddr_t *src; DE_CONST(s, src); /* Must come before IN6_IS_ADDR_V4MAPPED. */ REQUIRE(s->family == AF_INET6); REQUIRE(IN6_IS_ADDR_V4MAPPED(&src->type.in6)); memset(t, 0, sizeof(*t)); t->family = AF_INET; memcpy(&t->type.in, (char *)&src->type.in6 + 12, 4); return; }