316 lines
8.1 KiB
C
316 lines
8.1 KiB
C
/*
|
|
* Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
|
|
* Copyright (C) 1999-2003 Internet Software Consortium.
|
|
*
|
|
* Permission to use, copy, modify, and 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: ifiter_sysctl.c,v 1.14.12.7 2004/03/08 09:04:56 marka Exp $ */
|
|
|
|
/*
|
|
* Obtain the list of network interfaces using sysctl.
|
|
* See TCP/IP Illustrated Volume 2, sections 19.8, 19.14,
|
|
* and 19.16.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <net/route.h>
|
|
#include <net/if_dl.h>
|
|
|
|
/* XXX what about Alpha? */
|
|
#ifdef sgi
|
|
#define ROUNDUP(a) ((a) > 0 ? \
|
|
(1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) : \
|
|
sizeof(__uint64_t))
|
|
#else
|
|
#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) \
|
|
: sizeof(long))
|
|
#endif
|
|
|
|
#define IFITER_MAGIC ISC_MAGIC('I', 'F', 'I', 'S')
|
|
#define VALID_IFITER(t) ISC_MAGIC_VALID(t, IFITER_MAGIC)
|
|
|
|
struct isc_interfaceiter {
|
|
unsigned int magic; /* Magic number. */
|
|
isc_mem_t *mctx;
|
|
void *buf; /* Buffer for sysctl data. */
|
|
unsigned int bufsize; /* Bytes allocated. */
|
|
unsigned int bufused; /* Bytes used. */
|
|
unsigned int pos; /* Current offset in
|
|
sysctl data. */
|
|
isc_interface_t current; /* Current interface data. */
|
|
isc_result_t result; /* Last result code. */
|
|
};
|
|
|
|
static int mib[6] = {
|
|
CTL_NET,
|
|
PF_ROUTE,
|
|
0,
|
|
0, /* Any address family. */
|
|
NET_RT_IFLIST,
|
|
0 /* Flags. */
|
|
};
|
|
|
|
isc_result_t
|
|
isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp) {
|
|
isc_interfaceiter_t *iter;
|
|
isc_result_t result;
|
|
size_t bufsize;
|
|
size_t bufused;
|
|
char strbuf[ISC_STRERRORSIZE];
|
|
|
|
REQUIRE(iterp != NULL);
|
|
REQUIRE(*iterp == NULL);
|
|
|
|
iter = isc_mem_get(mctx, sizeof(*iter));
|
|
if (iter == NULL)
|
|
return (ISC_R_NOMEMORY);
|
|
|
|
iter->mctx = mctx;
|
|
iter->buf = 0;
|
|
|
|
/*
|
|
* Determine the amount of memory needed.
|
|
*/
|
|
bufsize = 0;
|
|
if (sysctl(mib, 6, NULL, &bufsize, NULL, (size_t) 0) < 0) {
|
|
isc__strerror(errno, strbuf, sizeof(strbuf));
|
|
UNEXPECTED_ERROR(__FILE__, __LINE__,
|
|
isc_msgcat_get(isc_msgcat,
|
|
ISC_MSGSET_IFITERSYSCTL,
|
|
ISC_MSG_GETIFLISTSIZE,
|
|
"getting interface "
|
|
"list size: sysctl: %s"),
|
|
strbuf);
|
|
result = ISC_R_UNEXPECTED;
|
|
goto failure;
|
|
}
|
|
iter->bufsize = bufsize;
|
|
|
|
iter->buf = isc_mem_get(iter->mctx, iter->bufsize);
|
|
if (iter->buf == NULL) {
|
|
result = ISC_R_NOMEMORY;
|
|
goto failure;
|
|
}
|
|
|
|
bufused = bufsize;
|
|
if (sysctl(mib, 6, iter->buf, &bufused, NULL, (size_t) 0) < 0) {
|
|
isc__strerror(errno, strbuf, sizeof(strbuf));
|
|
UNEXPECTED_ERROR(__FILE__, __LINE__,
|
|
isc_msgcat_get(isc_msgcat,
|
|
ISC_MSGSET_IFITERSYSCTL,
|
|
ISC_MSG_GETIFLIST,
|
|
"getting interface list: "
|
|
"sysctl: %s"),
|
|
strbuf);
|
|
result = ISC_R_UNEXPECTED;
|
|
goto failure;
|
|
}
|
|
iter->bufused = bufused;
|
|
INSIST(iter->bufused <= iter->bufsize);
|
|
|
|
/*
|
|
* A newly created iterator has an undefined position
|
|
* until isc_interfaceiter_first() is called.
|
|
*/
|
|
iter->pos = (unsigned int) -1;
|
|
iter->result = ISC_R_FAILURE;
|
|
|
|
iter->magic = IFITER_MAGIC;
|
|
*iterp = iter;
|
|
return (ISC_R_SUCCESS);
|
|
|
|
failure:
|
|
if (iter->buf != NULL)
|
|
isc_mem_put(mctx, iter->buf, iter->bufsize);
|
|
isc_mem_put(mctx, iter, sizeof(*iter));
|
|
return (result);
|
|
}
|
|
|
|
/*
|
|
* Get information about the current interface to iter->current.
|
|
* If successful, return ISC_R_SUCCESS.
|
|
* If the interface has an unsupported address family,
|
|
* return ISC_R_IGNORE. In case of other failure,
|
|
* return ISC_R_UNEXPECTED.
|
|
*/
|
|
|
|
static isc_result_t
|
|
internal_current(isc_interfaceiter_t *iter) {
|
|
struct ifa_msghdr *ifam, *ifam_end;
|
|
|
|
REQUIRE(VALID_IFITER(iter));
|
|
REQUIRE (iter->pos < (unsigned int) iter->bufused);
|
|
|
|
ifam = (struct ifa_msghdr *) ((char *) iter->buf + iter->pos);
|
|
ifam_end = (struct ifa_msghdr *) ((char *) iter->buf + iter->bufused);
|
|
|
|
if (ifam->ifam_type == RTM_IFINFO) {
|
|
struct if_msghdr *ifm = (struct if_msghdr *) ifam;
|
|
struct sockaddr_dl *sdl = (struct sockaddr_dl *) (ifm + 1);
|
|
unsigned int namelen;
|
|
|
|
memset(&iter->current, 0, sizeof(iter->current));
|
|
|
|
namelen = sdl->sdl_nlen;
|
|
if (namelen > sizeof(iter->current.name) - 1)
|
|
namelen = sizeof(iter->current.name) - 1;
|
|
|
|
memset(iter->current.name, 0, sizeof(iter->current.name));
|
|
memcpy(iter->current.name, sdl->sdl_data, namelen);
|
|
|
|
iter->current.flags = 0;
|
|
|
|
if ((ifam->ifam_flags & IFF_UP) != 0)
|
|
iter->current.flags |= INTERFACE_F_UP;
|
|
|
|
if ((ifam->ifam_flags & IFF_POINTOPOINT) != 0)
|
|
iter->current.flags |= INTERFACE_F_POINTTOPOINT;
|
|
|
|
if ((ifam->ifam_flags & IFF_LOOPBACK) != 0)
|
|
iter->current.flags |= INTERFACE_F_LOOPBACK;
|
|
|
|
if ((ifam->ifam_flags & IFF_BROADCAST) != 0) {
|
|
iter->current.flags |= INTERFACE_F_BROADCAST;
|
|
}
|
|
#ifdef IFF_MULTICAST
|
|
if ((ifam->ifam_flags & IFF_MULTICAST) != 0) {
|
|
iter->current.flags |= INTERFACE_F_MULTICAST;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* This is not an interface address.
|
|
* Force another iteration.
|
|
*/
|
|
return (ISC_R_IGNORE);
|
|
} else if (ifam->ifam_type == RTM_NEWADDR) {
|
|
int i;
|
|
int family;
|
|
struct sockaddr *mask_sa = NULL;
|
|
struct sockaddr *addr_sa = NULL;
|
|
struct sockaddr *dst_sa = NULL;
|
|
|
|
struct sockaddr *sa = (struct sockaddr *)(ifam + 1);
|
|
family = sa->sa_family;
|
|
|
|
for (i = 0; i < RTAX_MAX; i++)
|
|
{
|
|
if ((ifam->ifam_addrs & (1 << i)) == 0)
|
|
continue;
|
|
|
|
INSIST(sa < (struct sockaddr *) ifam_end);
|
|
|
|
switch (i) {
|
|
case RTAX_NETMASK: /* Netmask */
|
|
mask_sa = sa;
|
|
break;
|
|
case RTAX_IFA: /* Interface address */
|
|
addr_sa = sa;
|
|
break;
|
|
case RTAX_BRD: /* Broadcast or destination address */
|
|
dst_sa = sa;
|
|
break;
|
|
}
|
|
#ifdef ISC_PLATFORM_HAVESALEN
|
|
sa = (struct sockaddr *)((char*)(sa)
|
|
+ ROUNDUP(sa->sa_len));
|
|
#else
|
|
#ifdef sgi
|
|
/*
|
|
* Do as the contributed SGI code does.
|
|
*/
|
|
sa = (struct sockaddr *)((char*)(sa)
|
|
+ ROUNDUP(_FAKE_SA_LEN_DST(sa)));
|
|
#else
|
|
/* XXX untested. */
|
|
sa = (struct sockaddr *)((char*)(sa)
|
|
+ ROUNDUP(sizeof(struct sockaddr)));
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
if (addr_sa == NULL)
|
|
return (ISC_R_IGNORE);
|
|
|
|
family = addr_sa->sa_family;
|
|
if (family != AF_INET && family != AF_INET6)
|
|
return (ISC_R_IGNORE);
|
|
|
|
iter->current.af = family;
|
|
|
|
get_addr(family, &iter->current.address, addr_sa,
|
|
iter->current.name);
|
|
|
|
if (mask_sa != NULL)
|
|
get_addr(family, &iter->current.netmask, mask_sa,
|
|
iter->current.name);
|
|
|
|
if (dst_sa != NULL &&
|
|
(iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0)
|
|
get_addr(family, &iter->current.dstaddress, dst_sa,
|
|
iter->current.name);
|
|
|
|
if (dst_sa != NULL &&
|
|
(iter->current.flags & INTERFACE_F_BROADCAST) != 0)
|
|
get_addr(family, &iter->current.broadcast, dst_sa,
|
|
iter->current.name);
|
|
|
|
|
|
return (ISC_R_SUCCESS);
|
|
} else {
|
|
printf(isc_msgcat_get(isc_msgcat, ISC_MSGSET_IFITERSYSCTL,
|
|
ISC_MSG_UNEXPECTEDTYPE,
|
|
"warning: unexpected interface list "
|
|
"message type\n"));
|
|
return (ISC_R_IGNORE);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Step the iterator to the next interface. Unlike
|
|
* isc_interfaceiter_next(), this may leave the iterator
|
|
* positioned on an interface that will ultimately
|
|
* be ignored. Return ISC_R_NOMORE if there are no more
|
|
* interfaces, otherwise ISC_R_SUCCESS.
|
|
*/
|
|
static isc_result_t
|
|
internal_next(isc_interfaceiter_t *iter) {
|
|
struct ifa_msghdr *ifam;
|
|
REQUIRE (iter->pos < (unsigned int) iter->bufused);
|
|
|
|
ifam = (struct ifa_msghdr *) ((char *) iter->buf + iter->pos);
|
|
|
|
iter->pos += ifam->ifam_msglen;
|
|
|
|
if (iter->pos >= iter->bufused)
|
|
return (ISC_R_NOMORE);
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static void
|
|
internal_destroy(isc_interfaceiter_t *iter) {
|
|
UNUSED(iter); /* Unused. */
|
|
/*
|
|
* Do nothing.
|
|
*/
|
|
}
|
|
|
|
static
|
|
void internal_first(isc_interfaceiter_t *iter) {
|
|
iter->pos = 0;
|
|
}
|