262 lines
6.6 KiB
C
262 lines
6.6 KiB
C
/*
|
|
* Copyright (C) 2004, 2005, 2007-2009 Internet Systems Consortium, Inc. ("ISC")
|
|
* Copyright (C) 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: ifiter_getifaddrs.c,v 1.13 2009/09/24 23:48:13 tbox Exp $ */
|
|
|
|
/*! \file
|
|
* \brief
|
|
* Obtain the list of network interfaces using the getifaddrs(3) library.
|
|
*/
|
|
|
|
#include <ifaddrs.h>
|
|
|
|
/*% Iterator Magic */
|
|
#define IFITER_MAGIC ISC_MAGIC('I', 'F', 'I', 'G')
|
|
/*% Valid Iterator */
|
|
#define VALID_IFITER(t) ISC_MAGIC_VALID(t, IFITER_MAGIC)
|
|
|
|
#ifdef __linux
|
|
static isc_boolean_t seenv6 = ISC_FALSE;
|
|
#endif
|
|
|
|
/*% Iterator structure */
|
|
struct isc_interfaceiter {
|
|
unsigned int magic; /*%< Magic number. */
|
|
isc_mem_t *mctx;
|
|
void *buf; /*%< (unused) */
|
|
unsigned int bufsize; /*%< (always 0) */
|
|
struct ifaddrs *ifaddrs; /*%< List of ifaddrs */
|
|
struct ifaddrs *pos; /*%< Ptr to current ifaddr */
|
|
isc_interface_t current; /*%< Current interface data. */
|
|
isc_result_t result; /*%< Last result code. */
|
|
#ifdef __linux
|
|
FILE * proc;
|
|
char entry[ISC_IF_INET6_SZ];
|
|
isc_result_t valid;
|
|
#endif
|
|
};
|
|
|
|
isc_result_t
|
|
isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp) {
|
|
isc_interfaceiter_t *iter;
|
|
isc_result_t result;
|
|
char strbuf[ISC_STRERRORSIZE];
|
|
int trys, ret;
|
|
|
|
REQUIRE(mctx != NULL);
|
|
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 = NULL;
|
|
iter->bufsize = 0;
|
|
iter->ifaddrs = NULL;
|
|
#ifdef __linux
|
|
/*
|
|
* Only open "/proc/net/if_inet6" if we have never seen a IPv6
|
|
* address returned by getifaddrs().
|
|
*/
|
|
if (!seenv6) {
|
|
iter->proc = fopen("/proc/net/if_inet6", "r");
|
|
if (iter->proc == NULL) {
|
|
isc__strerror(errno, strbuf, sizeof(strbuf));
|
|
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
|
|
ISC_LOGMODULE_SOCKET, ISC_LOG_WARNING,
|
|
"failed to open /proc/net/if_inet6");
|
|
}
|
|
} else
|
|
iter->proc = NULL;
|
|
iter->valid = ISC_R_FAILURE;
|
|
#endif
|
|
|
|
/* If interrupted, try again */
|
|
for (trys = 0; trys < 3; trys++) {
|
|
if ((ret = getifaddrs(&iter->ifaddrs)) >= 0)
|
|
break;
|
|
if (errno != EINTR)
|
|
break;
|
|
}
|
|
if (ret < 0) {
|
|
isc__strerror(errno, strbuf, sizeof(strbuf));
|
|
UNEXPECTED_ERROR(__FILE__, __LINE__,
|
|
"getting interface addresses: %s: %s",
|
|
isc_msgcat_get(isc_msgcat,
|
|
ISC_MSGSET_IFITERGETIFADDRS,
|
|
ISC_MSG_GETIFADDRS,
|
|
"getifaddrs"),
|
|
strbuf);
|
|
result = ISC_R_UNEXPECTED;
|
|
goto failure;
|
|
}
|
|
|
|
/*
|
|
* A newly created iterator has an undefined position
|
|
* until isc_interfaceiter_first() is called.
|
|
*/
|
|
iter->pos = NULL;
|
|
iter->result = ISC_R_FAILURE;
|
|
|
|
iter->magic = IFITER_MAGIC;
|
|
*iterp = iter;
|
|
return (ISC_R_SUCCESS);
|
|
|
|
failure:
|
|
#ifdef __linux
|
|
if (iter->proc != NULL)
|
|
fclose(iter->proc);
|
|
#endif
|
|
if (iter->ifaddrs != NULL) /* just in case */
|
|
freeifaddrs(iter->ifaddrs);
|
|
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.
|
|
*/
|
|
|
|
static isc_result_t
|
|
internal_current(isc_interfaceiter_t *iter) {
|
|
struct ifaddrs *ifa;
|
|
int family;
|
|
unsigned int namelen;
|
|
|
|
REQUIRE(VALID_IFITER(iter));
|
|
|
|
ifa = iter->pos;
|
|
|
|
#ifdef __linux
|
|
if (iter->pos == NULL)
|
|
return (linux_if_inet6_current(iter));
|
|
#endif
|
|
|
|
INSIST(ifa != NULL);
|
|
INSIST(ifa->ifa_name != NULL);
|
|
|
|
if (ifa->ifa_addr == NULL)
|
|
return (ISC_R_IGNORE);
|
|
|
|
family = ifa->ifa_addr->sa_family;
|
|
if (family != AF_INET && family != AF_INET6)
|
|
return (ISC_R_IGNORE);
|
|
|
|
#ifdef __linux
|
|
if (family == AF_INET6)
|
|
seenv6 = ISC_TRUE;
|
|
#endif
|
|
|
|
memset(&iter->current, 0, sizeof(iter->current));
|
|
|
|
namelen = strlen(ifa->ifa_name);
|
|
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, ifa->ifa_name, namelen);
|
|
|
|
iter->current.flags = 0;
|
|
|
|
if ((ifa->ifa_flags & IFF_UP) != 0)
|
|
iter->current.flags |= INTERFACE_F_UP;
|
|
|
|
if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0)
|
|
iter->current.flags |= INTERFACE_F_POINTTOPOINT;
|
|
|
|
if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
|
|
iter->current.flags |= INTERFACE_F_LOOPBACK;
|
|
|
|
if ((ifa->ifa_flags & IFF_BROADCAST) != 0)
|
|
iter->current.flags |= INTERFACE_F_BROADCAST;
|
|
|
|
#ifdef IFF_MULTICAST
|
|
if ((ifa->ifa_flags & IFF_MULTICAST) != 0)
|
|
iter->current.flags |= INTERFACE_F_MULTICAST;
|
|
#endif
|
|
|
|
iter->current.af = family;
|
|
|
|
get_addr(family, &iter->current.address, ifa->ifa_addr, ifa->ifa_name);
|
|
|
|
if (ifa->ifa_netmask != NULL)
|
|
get_addr(family, &iter->current.netmask, ifa->ifa_netmask,
|
|
ifa->ifa_name);
|
|
|
|
if (ifa->ifa_dstaddr != NULL &&
|
|
(iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0)
|
|
get_addr(family, &iter->current.dstaddress, ifa->ifa_dstaddr,
|
|
ifa->ifa_name);
|
|
|
|
if (ifa->ifa_broadaddr != NULL &&
|
|
(iter->current.flags & INTERFACE_F_BROADCAST) != 0)
|
|
get_addr(family, &iter->current.broadcast, ifa->ifa_broadaddr,
|
|
ifa->ifa_name);
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
|
|
if (iter->pos != NULL)
|
|
iter->pos = iter->pos->ifa_next;
|
|
if (iter->pos == NULL) {
|
|
#ifdef __linux
|
|
if (!seenv6)
|
|
return (linux_if_inet6_next(iter));
|
|
#endif
|
|
return (ISC_R_NOMORE);
|
|
}
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static void
|
|
internal_destroy(isc_interfaceiter_t *iter) {
|
|
|
|
#ifdef __linux
|
|
if (iter->proc != NULL)
|
|
fclose(iter->proc);
|
|
iter->proc = NULL;
|
|
#endif
|
|
if (iter->ifaddrs)
|
|
freeifaddrs(iter->ifaddrs);
|
|
iter->ifaddrs = NULL;
|
|
}
|
|
|
|
static
|
|
void internal_first(isc_interfaceiter_t *iter) {
|
|
|
|
#ifdef __linux
|
|
linux_if_inet6_first(iter);
|
|
#endif
|
|
iter->pos = iter->ifaddrs;
|
|
}
|