isc/unix/interfaceiter.c

	interfaceiter.c revision 9c3531d72aeaad6c5f01efe6a1c82023e1379e4d
/*
 * Copyright (C) 1999, 2000  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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM 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 1.17 2000/06/22 21:58:39 tale Exp $ */

#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/mem.h>
#include <isc/net.h>
#include <isc/result.h>
#include <isc/string.h>
#include <isc/types.h>
#include <isc/interfaceiter.h>
#include <isc/util.h>

#include <net/if.h>     /* Must follow <isc/net.h>. */

/* Common utility functions */

/*
 * Extract the network address part from a "struct sockaddr".
 *
 * The address family is given explicity
 * 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) {
    dst->family = family;
    switch (family) {
    case AF_INET:
        memcpy(&dst->type.in,
               &((struct sockaddr_in *) src)->sin_addr,
               sizeof(struct in_addr));
        break;
    case    AF_INET6:
        memcpy(&dst->type.in6,
               &((struct sockaddr_in6 *) src)->sin6_addr,
               sizeof(struct in6_addr));
        break;
    default:
        INSIST(0);
        break;
    }
}

/*
 * Include system-dependent code.
 */

#if HAVE_IFLIST_SYSCTL
#include "ifiter_sysctl.c"
#else
#include "ifiter_ioctl.c"
#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));

    iter->pos = 0;
    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);
    isc_mem_put(iter->mctx, iter->buf, iter->bufsize);

    iter->magic = 0;
    isc_mem_put(iter->mctx, iter, sizeof *iter);
    *iterp = NULL;
}