/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <errno.h>
#include <libinetutil.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/sockio.h>

/*
 * Create a list of the addresses on physical interface `ifname' with at least
 * one of the flags in `set' set and all of the flags in `clear' clear.
 * Return the number of items in the list, or -1 on failure.
 */
int
ifaddrlistx(const char *ifname, uint64_t set, uint64_t clear,
    ifaddrlistx_t **ifaddrsp)
{
        struct lifconf  lifc;
        struct lifnum   lifn;
        struct lifreq   *lifrp;
        ifaddrlistx_t   *ifaddrp, *ifaddrs = NULL;
        int             i, nlifr, naddr = 0;
        char            *cp;
        uint_t          flags;
        int             s4, s6 = -1;
        boolean_t       isv6;
        int             save_errno;
        struct sockaddr_storage addr;

        (void) memset(&lifc, 0, sizeof (lifc));
        flags = LIFC_NOXMIT | LIFC_ALLZONES | LIFC_TEMPORARY | LIFC_UNDER_IPMP;

        /*
         * We need both IPv4 and IPv6 sockets to query both IPv4 and IPv6
         * interfaces below.
         */
        if ((s4 = socket(AF_INET, SOCK_DGRAM, 0)) == -1 ||
            (s6 = socket(AF_INET6, SOCK_DGRAM, 0)) == -1) {
                goto fail;
        }

        /*
         * Get the number of network interfaces of type `family'.
         */
        lifn.lifn_family = AF_UNSPEC;
        lifn.lifn_flags = flags;
again:
        if (ioctl(s4, SIOCGLIFNUM, &lifn) == -1)
                goto fail;

        /*
         * Pad the interface count to detect when additional interfaces have
         * been configured between SIOCGLIFNUM and SIOCGLIFCONF.
         */
        lifn.lifn_count += 4;

        lifc.lifc_flags = flags;
        lifc.lifc_family = AF_UNSPEC;
        lifc.lifc_len = lifn.lifn_count * sizeof (struct lifreq);
        if ((lifc.lifc_buf = realloc(lifc.lifc_buf, lifc.lifc_len)) == NULL)
                goto fail;

        if (ioctl(s4, SIOCGLIFCONF, &lifc) == -1)
                goto fail;

        /*
         * If every lifr_req slot is taken, then additional interfaces must
         * have been plumbed between the SIOCGLIFNUM and the SIOCGLIFCONF.
         * Recalculate to make sure we didn't miss any interfaces.
         */
        nlifr = lifc.lifc_len / sizeof (struct lifreq);
        if (nlifr >= lifn.lifn_count)
                goto again;

        /*
         * Populate the ifaddrlistx by querying each matching interface.  If a
         * query ioctl returns ENXIO, then the interface must have been
         * removed after the SIOCGLIFCONF completed -- so we just ignore it.
         */
        for (lifrp = lifc.lifc_req, i = 0; i < nlifr; i++, lifrp++) {
                if ((cp = strchr(lifrp->lifr_name, ':')) != NULL)
                        *cp = '\0';

                if (strcmp(lifrp->lifr_name, ifname) != 0)
                        continue;

                if (cp != NULL)
                        *cp = ':';

                addr = lifrp->lifr_addr;
                isv6 = addr.ss_family == AF_INET6;
                if (ioctl(isv6 ? s6 : s4, SIOCGLIFFLAGS, lifrp) == -1) {
                        if (errno == ENXIO)
                                continue;
                        goto fail;
                }

                if (set != 0 && ((lifrp->lifr_flags & set) == 0) ||
                    (lifrp->lifr_flags & clear) != 0)
                        continue;

                /*
                 * We've got a match; allocate a new record.
                 */
                if ((ifaddrp = malloc(sizeof (ifaddrlistx_t))) == NULL)
                        goto fail;

                (void) strlcpy(ifaddrp->ia_name, lifrp->lifr_name, LIFNAMSIZ);
                ifaddrp->ia_flags = lifrp->lifr_flags;
                ifaddrp->ia_addr = addr;
                ifaddrp->ia_next = ifaddrs;
                ifaddrs = ifaddrp;
                naddr++;
        }

        (void) close(s4);
        (void) close(s6);
        free(lifc.lifc_buf);
        *ifaddrsp = ifaddrs;
        return (naddr);
fail:
        save_errno = errno;
        (void) close(s4);
        (void) close(s6);
        free(lifc.lifc_buf);
        ifaddrlistx_free(ifaddrs);
        errno = save_errno;
        return (-1);
}

/*
 * Free the provided ifaddrlistx_t.
 */
void
ifaddrlistx_free(ifaddrlistx_t *ifaddrp)
{
        ifaddrlistx_t *next_ifaddrp;

        for (; ifaddrp != NULL; ifaddrp = next_ifaddrp) {
                next_ifaddrp = ifaddrp->ia_next;
                free(ifaddrp);
        }
}