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-rw-r--r--lib/isc/netaddr.c467
1 files changed, 467 insertions, 0 deletions
diff --git a/lib/isc/netaddr.c b/lib/isc/netaddr.c
new file mode 100644
index 0000000..c674d83
--- /dev/null
+++ b/lib/isc/netaddr.c
@@ -0,0 +1,467 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+#include <isc/buffer.h>
+#include <isc/net.h>
+#include <isc/netaddr.h>
+#include <isc/print.h>
+#include <isc/sockaddr.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+bool
+isc_netaddr_equal(const isc_netaddr_t *a, const isc_netaddr_t *b) {
+ REQUIRE(a != NULL && b != NULL);
+
+ if (a->family != b->family) {
+ return (false);
+ }
+
+ if (a->zone != b->zone) {
+ return (false);
+ }
+
+ switch (a->family) {
+ case AF_INET:
+ if (a->type.in.s_addr != b->type.in.s_addr) {
+ return (false);
+ }
+ break;
+ case AF_INET6:
+ if (memcmp(&a->type.in6, &b->type.in6, sizeof(a->type.in6)) !=
+ 0 ||
+ a->zone != b->zone)
+ {
+ return (false);
+ }
+ break;
+ case AF_UNIX:
+ if (strcmp(a->type.un, b->type.un) != 0) {
+ return (false);
+ }
+ break;
+ default:
+ return (false);
+ }
+ return (true);
+}
+
+bool
+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 (false);
+ }
+
+ if (a->zone != b->zone && b->zone != 0) {
+ return (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 (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 (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 (false);
+ }
+ }
+ return (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;
+ 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);
+ default:
+ return (ISC_R_FAILURE);
+ }
+ r = inet_ntop(netaddr->family, type, abuf, sizeof(abuf));
+ if (r == NULL) {
+ return (ISC_R_FAILURE);
+ }
+
+ alen = strlen(abuf);
+ 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, (unsigned int)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, "<unknown address, family %u>",
+ 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];
+ 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) {
+ INSIST(nbytes < ipbytes);
+ if ((p[nbytes] & (0xff >> nbits)) != 0U) {
+ return (ISC_R_FAILURE);
+ }
+ nbytes++;
+ }
+ if (nbytes < ipbytes &&
+ 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) {
+ 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);
+}
+
+void
+isc_netaddr_setzone(isc_netaddr_t *netaddr, uint32_t zone) {
+ /* we currently only support AF_INET6. */
+ REQUIRE(netaddr->family == AF_INET6);
+
+ netaddr->zone = zone;
+}
+
+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:
+ memmove(&t->type.in6, &s->type.sin6.sin6_addr, 16);
+ t->zone = s->type.sin6.sin6_scope_id;
+ break;
+ case AF_UNIX:
+ memmove(t->type.un, s->type.sunix.sun_path, sizeof(t->type.un));
+ t->zone = 0;
+ break;
+ default:
+ UNREACHABLE();
+ }
+}
+
+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;
+}
+
+void
+isc_netaddr_unspec(isc_netaddr_t *netaddr) {
+ memset(netaddr, 0, sizeof(*netaddr));
+ netaddr->family = AF_UNSPEC;
+}
+
+bool
+isc_netaddr_ismulticast(const isc_netaddr_t *na) {
+ switch (na->family) {
+ case AF_INET:
+ return (ISC_IPADDR_ISMULTICAST(na->type.in.s_addr));
+ case AF_INET6:
+ return (IN6_IS_ADDR_MULTICAST(&na->type.in6));
+ default:
+ return (false); /* XXXMLG ? */
+ }
+}
+
+bool
+isc_netaddr_isexperimental(const isc_netaddr_t *na) {
+ switch (na->family) {
+ case AF_INET:
+ return (ISC_IPADDR_ISEXPERIMENTAL(na->type.in.s_addr));
+ default:
+ return (false); /* XXXMLG ? */
+ }
+}
+
+bool
+isc_netaddr_islinklocal(const isc_netaddr_t *na) {
+ switch (na->family) {
+ case AF_INET:
+ return (false);
+ case AF_INET6:
+ return (IN6_IS_ADDR_LINKLOCAL(&na->type.in6));
+ default:
+ return (false);
+ }
+}
+
+bool
+isc_netaddr_issitelocal(const isc_netaddr_t *na) {
+ switch (na->family) {
+ case AF_INET:
+ return (false);
+ case AF_INET6:
+ return (IN6_IS_ADDR_SITELOCAL(&na->type.in6));
+ default:
+ return (false);
+ }
+}
+
+#define ISC_IPADDR_ISNETZERO(i) \
+ (((uint32_t)(i)&ISC__IPADDR(0xff000000)) == ISC__IPADDR(0x00000000))
+
+bool
+isc_netaddr_isnetzero(const isc_netaddr_t *na) {
+ switch (na->family) {
+ case AF_INET:
+ return (ISC_IPADDR_ISNETZERO(na->type.in.s_addr));
+ case AF_INET6:
+ return (false);
+ default:
+ return (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;
+ memmove(&t->type.in, (char *)&src->type.in6 + 12, 4);
+ return;
+}
+
+bool
+isc_netaddr_isloopback(const isc_netaddr_t *na) {
+ switch (na->family) {
+ case AF_INET:
+ return (((ntohl(na->type.in.s_addr) & 0xff000000U) ==
+ 0x7f000000U));
+ case AF_INET6:
+ return (IN6_IS_ADDR_LOOPBACK(&na->type.in6));
+ default:
+ return (false);
+ }
+}
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