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+/*
+ * Copyright (C) 2004, 2005, 2007, 2008 Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 1999-2003 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: interfaceiter.c,v 1.45 2008/12/01 03:51:47 marka Exp $ */
+
+/*! \file */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#ifdef HAVE_SYS_SOCKIO_H
+#include <sys/sockio.h> /* Required for ifiter_ioctl.c. */
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <isc/interfaceiter.h>
+#include <isc/log.h>
+#include <isc/magic.h>
+#include <isc/mem.h>
+#include <isc/msgs.h>
+#include <isc/net.h>
+#include <isc/print.h>
+#include <isc/result.h>
+#include <isc/strerror.h>
+#include <isc/string.h>
+#include <isc/types.h>
+#include <isc/util.h>
+
+/* Must follow <isc/net.h>. */
+#ifdef HAVE_NET_IF6_H
+#include <net/if6.h>
+#endif
+#include <net/if.h>
+
+#ifdef HAVE_LINUX_IF_ADDR_H
+# include <linux/if_addr.h>
+#endif
+
+/* Common utility functions */
+
+/*%
+ * Extract the network address part from a "struct sockaddr".
+ * \brief
+ * The address family is given explicitly
+ * instead of using src->sa_family, because the latter does not work
+ * for copying a network mask obtained by SIOCGIFNETMASK (it does
+ * not have a valid address family).
+ */
+
+static void
+get_addr(unsigned int family, isc_netaddr_t *dst, struct sockaddr *src,
+ char *ifname)
+{
+ struct sockaddr_in6 *sa6;
+
+#if !defined(ISC_PLATFORM_HAVEIFNAMETOINDEX) || \
+ !defined(ISC_PLATFORM_HAVESCOPEID)
+ UNUSED(ifname);
+#endif
+
+ /* clear any remaining value for safety */
+ memset(dst, 0, sizeof(*dst));
+
+ dst->family = family;
+ switch (family) {
+ case AF_INET:
+ memcpy(&dst->type.in,
+ &((struct sockaddr_in *)(void *)src)->sin_addr,
+ sizeof(struct in_addr));
+ break;
+ case AF_INET6:
+ sa6 = (struct sockaddr_in6 *)(void *)src;
+ memcpy(&dst->type.in6, &sa6->sin6_addr,
+ sizeof(struct in6_addr));
+#ifdef ISC_PLATFORM_HAVESCOPEID
+ if (sa6->sin6_scope_id != 0)
+ isc_netaddr_setzone(dst, sa6->sin6_scope_id);
+ else {
+ /*
+ * BSD variants embed scope zone IDs in the 128bit
+ * address as a kernel internal form. Unfortunately,
+ * the embedded IDs are not hidden from applications
+ * when getting access to them by sysctl or ioctl.
+ * We convert the internal format to the pure address
+ * part and the zone ID part.
+ * Since multicast addresses should not appear here
+ * and they cannot be distinguished from netmasks,
+ * we only consider unicast link-local addresses.
+ */
+ if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) {
+ isc_uint16_t zone16;
+
+ memcpy(&zone16, &sa6->sin6_addr.s6_addr[2],
+ sizeof(zone16));
+ zone16 = ntohs(zone16);
+ if (zone16 != 0) {
+ /* the zone ID is embedded */
+ isc_netaddr_setzone(dst,
+ (isc_uint32_t)zone16);
+ dst->type.in6.s6_addr[2] = 0;
+ dst->type.in6.s6_addr[3] = 0;
+#ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
+ } else if (ifname != NULL) {
+ unsigned int zone;
+
+ /*
+ * sin6_scope_id is still not provided,
+ * but the corresponding interface name
+ * is know. Use the interface ID as
+ * the link ID.
+ */
+ zone = if_nametoindex(ifname);
+ if (zone != 0) {
+ isc_netaddr_setzone(dst,
+ (isc_uint32_t)zone);
+ }
+#endif
+ }
+ }
+ }
+#endif
+ break;
+ default:
+ INSIST(0);
+ break;
+ }
+}
+
+/*
+ * Include system-dependent code.
+ */
+
+#ifdef __linux
+#define ISC_IF_INET6_SZ \
+ sizeof("00000000000000000000000000000001 01 80 10 80 XXXXXXloXXXXXXXX\n")
+static isc_result_t linux_if_inet6_next(isc_interfaceiter_t *);
+static isc_result_t linux_if_inet6_current(isc_interfaceiter_t *);
+static void linux_if_inet6_first(isc_interfaceiter_t *iter);
+#endif
+
+#if HAVE_GETIFADDRS
+#include "ifiter_getifaddrs.c"
+#elif HAVE_IFLIST_SYSCTL
+#include "ifiter_sysctl.c"
+#else
+#include "ifiter_ioctl.c"
+#endif
+
+#ifdef __linux
+static void
+linux_if_inet6_first(isc_interfaceiter_t *iter) {
+ if (iter->proc != NULL) {
+ rewind(iter->proc);
+ (void)linux_if_inet6_next(iter);
+ } else
+ iter->valid = ISC_R_NOMORE;
+}
+
+static isc_result_t
+linux_if_inet6_next(isc_interfaceiter_t *iter) {
+ if (iter->proc != NULL &&
+ fgets(iter->entry, sizeof(iter->entry), iter->proc) != NULL)
+ iter->valid = ISC_R_SUCCESS;
+ else
+ iter->valid = ISC_R_NOMORE;
+ return (iter->valid);
+}
+
+static isc_result_t
+linux_if_inet6_current(isc_interfaceiter_t *iter) {
+ char address[33];
+ char name[IF_NAMESIZE+1];
+ struct in6_addr addr6;
+ unsigned int ifindex;
+ int prefix, scope, flags;
+ int res;
+ unsigned int i;
+
+ if (iter->valid != ISC_R_SUCCESS)
+ return (iter->valid);
+ if (iter->proc == NULL) {
+ isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+ ISC_LOGMODULE_INTERFACE, ISC_LOG_ERROR,
+ "/proc/net/if_inet6:iter->proc == NULL");
+ return (ISC_R_FAILURE);
+ }
+
+ res = sscanf(iter->entry, "%32[a-f0-9] %x %x %x %x %16s\n",
+ address, &ifindex, &prefix, &scope, &flags, name);
+ if (res != 6) {
+ isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+ ISC_LOGMODULE_INTERFACE, ISC_LOG_ERROR,
+ "/proc/net/if_inet6:sscanf() -> %d (expected 6)",
+ res);
+ return (ISC_R_FAILURE);
+ }
+ if (strlen(address) != 32) {
+ isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+ ISC_LOGMODULE_INTERFACE, ISC_LOG_ERROR,
+ "/proc/net/if_inet6:strlen(%s) != 32", address);
+ return (ISC_R_FAILURE);
+ }
+ /*
+ ** Ignore DAD addresses --
+ ** we can't bind to them until they are resolved
+ */
+#ifdef IFA_F_TENTATIVE
+ if (flags & IFA_F_TENTATIVE)
+ return (ISC_R_IGNORE);
+#endif
+
+ for (i = 0; i < 16; i++) {
+ unsigned char byte;
+ static const char hex[] = "0123456789abcdef";
+ byte = ((strchr(hex, address[i * 2]) - hex) << 4) |
+ (strchr(hex, address[i * 2 + 1]) - hex);
+ addr6.s6_addr[i] = byte;
+ }
+ iter->current.af = AF_INET6;
+ iter->current.flags = INTERFACE_F_UP;
+ isc_netaddr_fromin6(&iter->current.address, &addr6);
+ iter->current.ifindex = ifindex;
+ if (isc_netaddr_islinklocal(&iter->current.address)) {
+ isc_netaddr_setzone(&iter->current.address,
+ (isc_uint32_t)ifindex);
+ }
+ for (i = 0; i < 16; i++) {
+ if (prefix > 8) {
+ addr6.s6_addr[i] = 0xff;
+ prefix -= 8;
+ } else {
+ addr6.s6_addr[i] = (0xff << (8 - prefix)) & 0xff;
+ prefix = 0;
+ }
+ }
+ isc_netaddr_fromin6(&iter->current.netmask, &addr6);
+ strncpy(iter->current.name, name, sizeof(iter->current.name));
+ return (ISC_R_SUCCESS);
+}
+#endif
+
+/*
+ * The remaining code is common to the sysctl and ioctl case.
+ */
+
+isc_result_t
+isc_interfaceiter_current(isc_interfaceiter_t *iter,
+ isc_interface_t *ifdata)
+{
+ REQUIRE(iter->result == ISC_R_SUCCESS);
+ memcpy(ifdata, &iter->current, sizeof(*ifdata));
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_interfaceiter_first(isc_interfaceiter_t *iter) {
+ isc_result_t result;
+
+ REQUIRE(VALID_IFITER(iter));
+
+ internal_first(iter);
+ for (;;) {
+ result = internal_current(iter);
+ if (result != ISC_R_IGNORE)
+ break;
+ result = internal_next(iter);
+ if (result != ISC_R_SUCCESS)
+ break;
+ }
+ iter->result = result;
+ return (result);
+}
+
+isc_result_t
+isc_interfaceiter_next(isc_interfaceiter_t *iter) {
+ isc_result_t result;
+
+ REQUIRE(VALID_IFITER(iter));
+ REQUIRE(iter->result == ISC_R_SUCCESS);
+
+ for (;;) {
+ result = internal_next(iter);
+ if (result != ISC_R_SUCCESS)
+ break;
+ result = internal_current(iter);
+ if (result != ISC_R_IGNORE)
+ break;
+ }
+ iter->result = result;
+ return (result);
+}
+
+void
+isc_interfaceiter_destroy(isc_interfaceiter_t **iterp)
+{
+ isc_interfaceiter_t *iter;
+ REQUIRE(iterp != NULL);
+ iter = *iterp;
+ REQUIRE(VALID_IFITER(iter));
+
+ internal_destroy(iter);
+ if (iter->buf != NULL)
+ isc_mem_put(iter->mctx, iter->buf, iter->bufsize);
+
+ iter->magic = 0;
+ isc_mem_put(iter->mctx, iter, sizeof(*iter));
+ *iterp = NULL;
+}
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