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/*
* 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 <sys/ioctl.h>
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h> /* Required for ifiter_ioctl.c. */
#endif /* ifdef HAVE_SYS_SOCKIO_H */
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <isc/interfaceiter.h>
#include <isc/log.h>
#include <isc/magic.h>
#include <isc/mem.h>
#include <isc/net.h>
#include <isc/print.h>
#include <isc/result.h>
#include <isc/strerr.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 /* ifdef HAVE_NET_IF6_H */
#include <net/if.h>
/* 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(HAVE_IF_NAMETOINDEX)
UNUSED(ifname);
#endif /* if !defined(HAVE_IF_NAMETOINDEX) */
/* clear any remaining value for safety */
memset(dst, 0, sizeof(*dst));
dst->family = family;
switch (family) {
case AF_INET:
memmove(&dst->type.in, &((struct sockaddr_in *)src)->sin_addr,
sizeof(struct in_addr));
break;
case AF_INET6:
sa6 = (struct sockaddr_in6 *)src;
memmove(&dst->type.in6, &sa6->sin6_addr,
sizeof(struct in6_addr));
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)) {
uint16_t zone16;
memmove(&zone16, &sa6->sin6_addr.s6_addr[2],
sizeof(zone16));
zone16 = ntohs(zone16);
if (zone16 != 0) {
/* the zone ID is embedded */
isc_netaddr_setzone(dst,
(uint32_t)zone16);
dst->type.in6.s6_addr[2] = 0;
dst->type.in6.s6_addr[3] = 0;
#ifdef HAVE_IF_NAMETOINDEX
} 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, (uint32_t)zone);
}
#endif /* ifdef HAVE_IF_NAMETOINDEX */
}
}
}
break;
default:
UNREACHABLE();
}
}
/*
* 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 /* ifdef __linux */
#include "ifiter_getifaddrs.c"
#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, prefix, flag3, flag4;
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, &flag3, &flag4, 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);
}
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);
if (isc_netaddr_islinklocal(&iter->current.address)) {
isc_netaddr_setzone(&iter->current.address, (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);
strlcpy(iter->current.name, name, sizeof(iter->current.name));
return (ISC_R_SUCCESS);
}
#endif /* ifdef __linux */
/*
* 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);
memmove(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;
*iterp = NULL;
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));
}
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