/* $Id$ */

/***
  This file is part of avahi.
 
  avahi is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation; either version 2.1 of the
  License, or (at your option) any later version.
 
  avahi is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
  Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with avahi; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>
#include <sys/socket.h>
#include <asm/types.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <errno.h>
#include <net/if.h>
#include <stdio.h>

#include <avahi-common/error.h>
#include <avahi-common/malloc.h>

#include "iface.h"
#include "netlink.h"
#include "dns.h"
#include "socket.h"
#include "announce.h"
#include "util.h"
#include "log.h"

static void update_address_rr(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a, int remove_rrs) {
    assert(m);
    assert(a);

    if (m->list == LIST_DONE &&
        avahi_interface_address_relevant(a) &&
        !remove_rrs &&
        m->server->config.publish_addresses &&
        (m->server->state == AVAHI_SERVER_RUNNING ||
        m->server->state == AVAHI_SERVER_REGISTERING)) {

        /* Fill the entry group */
        if (!a->entry_group) 
            a->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);

        if (!a->entry_group) /* OOM */
            return;
        
        if (avahi_s_entry_group_is_empty(a->entry_group)) {
            char t[64];
            avahi_address_snprint(t, sizeof(t), &a->address);

            avahi_log_info("Registering new address %s on %s.", t, a->interface->hardware->name);

            if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, a->interface->protocol, 0, NULL, &a->address) < 0) {
                avahi_log_warn(__FILE__": avahi_server_add_address() failed: %s", avahi_strerror(m->server->error));
                avahi_s_entry_group_free(a->entry_group);
                a->entry_group = NULL;
                return;
            }

            avahi_s_entry_group_commit(a->entry_group);
        }
    } else {

        /* Clear the entry group */

        if (a->entry_group && !avahi_s_entry_group_is_empty(a->entry_group)) {
            char t[64];
            avahi_address_snprint(t, sizeof(t), &a->address);

            if (avahi_s_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
                avahi_server_decrease_host_rr_pending(m->server);

            avahi_log_info("Withdrawing address %s on %s.", t, a->interface->hardware->name);
            
            avahi_s_entry_group_reset(a->entry_group);
        }
    } 
}

static void update_interface_rr(AvahiInterfaceMonitor *m, AvahiInterface *i, int remove_rrs) {
    AvahiInterfaceAddress *a;
    
    assert(m);
    assert(i);

    for (a = i->addresses; a; a = a->address_next)
        update_address_rr(m, a, remove_rrs);
}

static void update_hw_interface_rr(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int remove_rrs) {
    AvahiInterface *i;

    assert(m);
    assert(hw);

    for (i = hw->interfaces; i; i = i->by_hardware_next)
        update_interface_rr(m, i, remove_rrs);

    if (m->list == LIST_DONE &&
        !remove_rrs &&
        m->server->config.publish_workstation &&
        (m->server->state == AVAHI_SERVER_RUNNING ||
        m->server->state == AVAHI_SERVER_REGISTERING)) {

        if (!hw->entry_group)
            hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);

        if (!hw->entry_group)
            return; /* OOM */
        
        if (avahi_s_entry_group_is_empty(hw->entry_group)) {
            char *name;
            char *t;

            if (!(t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size)))
                return; /* OOM */

            name = avahi_strdup_printf("%s [%s]", m->server->host_name, t);
            avahi_free(t);

            if (!name)
                return; /* OOM */
            
            if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) { 
                avahi_log_warn(__FILE__": avahi_server_add_service() failed.");
                avahi_s_entry_group_free(hw->entry_group);
                hw->entry_group = NULL;
            } else
                avahi_s_entry_group_commit(hw->entry_group);

            avahi_free(name);
        }
        
    } else {

        if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {

            if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
                avahi_server_decrease_host_rr_pending(m->server);

            avahi_s_entry_group_reset(hw->entry_group);
        }
    }
}

static void free_address(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a) {
    assert(m);
    assert(a);
    assert(a->interface);

    update_address_rr(m, a, 1);
    AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);

    if (a->entry_group)
        avahi_s_entry_group_free(a->entry_group);
    
    avahi_free(a);
}

static void free_interface(AvahiInterfaceMonitor *m, AvahiInterface *i, int send_goodbye) {
    assert(m);
    assert(i);

    avahi_goodbye_interface(m->server, i, send_goodbye);
    avahi_response_scheduler_force(i->response_scheduler);
    
    assert(!i->announcements);

    update_interface_rr(m, i, 1);
    
    while (i->addresses)
        free_address(m, i->addresses);

    avahi_response_scheduler_free(i->response_scheduler);
    avahi_query_scheduler_free(i->query_scheduler);
    avahi_probe_scheduler_free(i->probe_scheduler);
    avahi_cache_free(i->cache);
    
    AVAHI_LLIST_REMOVE(AvahiInterface, interface, m->interfaces, i);
    AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
    
    avahi_free(i);
}

static void free_hw_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int send_goodbye) {
    assert(m);
    assert(hw);

    update_hw_interface_rr(m, hw, 1);
    
    while (hw->interfaces)
        free_interface(m, hw->interfaces, send_goodbye);

    if (hw->entry_group)
        avahi_s_entry_group_free(hw->entry_group);
    
    AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, m->hw_interfaces, hw);
    avahi_hashmap_remove(m->hashmap, &hw->index);

    avahi_free(hw->name);
    avahi_free(hw);
}

static AvahiInterfaceAddress* get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
    AvahiInterfaceAddress *ia;
    
    assert(m);
    assert(i);
    assert(raddr);

    for (ia = i->addresses; ia; ia = ia->address_next)
        if (avahi_address_cmp(&ia->address, raddr) == 0)
            return ia;

    return NULL;
}

static int netlink_list_items(AvahiNetlink *nl, uint16_t type, unsigned *ret_seq) {
    struct nlmsghdr *n;
    struct rtgenmsg *gen;
    uint8_t req[1024];
    
    memset(&req, 0, sizeof(req));
    n = (struct nlmsghdr*) req;
    n->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
    n->nlmsg_type = type;
    n->nlmsg_flags = NLM_F_ROOT/*|NLM_F_MATCH*/|NLM_F_REQUEST;
    n->nlmsg_pid = 0;

    gen = NLMSG_DATA(n);
    memset(gen, 0, sizeof(struct rtgenmsg));
    gen->rtgen_family = AF_UNSPEC;

    return avahi_netlink_send(nl, n, ret_seq);
}

static void new_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
    AvahiInterface *i;
    
    assert(m);
    assert(hw);
    assert(protocol != AVAHI_PROTO_UNSPEC);

    if (!(i = avahi_new(AvahiInterface, 1)))
        goto fail; /* OOM */
        
    i->monitor = m;
    i->hardware = hw;
    i->protocol = protocol;
    i->announcing = 0;

    AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
    AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, i->announcements);

    i->cache = avahi_cache_new(m->server, i);
    i->response_scheduler = avahi_response_scheduler_new(i);
    i->query_scheduler = avahi_query_scheduler_new(i);
    i->probe_scheduler = avahi_probe_scheduler_new(i);

    if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
        goto fail; /* OOM */

    AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
    AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);

    return;
fail:

    if (i) {
        if (i->cache)
            avahi_cache_free(i->cache);
        if (i->response_scheduler)
            avahi_response_scheduler_free(i->response_scheduler);
        if (i->query_scheduler)
            avahi_query_scheduler_free(i->query_scheduler);
        if (i->probe_scheduler)
            avahi_probe_scheduler_free(i->probe_scheduler);
    }
        
}

static void check_interface_relevant(AvahiInterfaceMonitor *m, AvahiInterface *i) {
    int b;

    assert(m);
    assert(i);

    b = avahi_interface_relevant(i);

    if (m->list == LIST_DONE && b && !i->announcing) {
        avahi_log_info("New relevant interface %s.%i.", i->hardware->name, i->protocol);

        if (i->protocol == AVAHI_PROTO_INET)
            avahi_mdns_mcast_join_ipv4(m->server->fd_ipv4, i->hardware->index);
        if (i->protocol == AVAHI_PROTO_INET6)
            avahi_mdns_mcast_join_ipv6(m->server->fd_ipv6, i->hardware->index);

        i->announcing = 1;
        avahi_announce_interface(m->server, i);
        avahi_browser_new_interface(m->server, i);
    } else if (!b && i->announcing) {
        avahi_log_info("Interface %s.%i no longer relevant.", i->hardware->name, i->protocol);

        if (i->protocol == AVAHI_PROTO_INET)
            avahi_mdns_mcast_leave_ipv4(m->server->fd_ipv4, i->hardware->index);
        if (i->protocol == AVAHI_PROTO_INET6)
            avahi_mdns_mcast_leave_ipv6(m->server->fd_ipv6, i->hardware->index);

        avahi_goodbye_interface(m->server, i, 0);
        avahi_response_scheduler_clear(i->response_scheduler);
        avahi_query_scheduler_clear(i->query_scheduler);
        avahi_probe_scheduler_clear(i->probe_scheduler);
        avahi_cache_flush(i->cache);

        i->announcing = 0;
    }
}

static void check_hw_interface_relevant(AvahiInterfaceMonitor *m, AvahiHwInterface *hw) {
    AvahiInterface *i;
    
    assert(m);
    assert(hw);

    for (i = hw->interfaces; i; i = i->by_hardware_next)
        check_interface_relevant(m, i);
}

static void check_all_interfaces_relevant(AvahiInterfaceMonitor *m) {
    AvahiInterface *i;
    assert(m);

    for (i = m->interfaces; i; i = i->interface_next)
        check_interface_relevant(m, i);
}

static void netlink_callback(AvahiNetlink *nl, struct nlmsghdr *n, void* userdata) {
    AvahiInterfaceMonitor *m = userdata;
    
    assert(m);
    assert(n);
    assert(m->netlink == nl);

    if (n->nlmsg_type == RTM_NEWLINK) {
        struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
        AvahiHwInterface *hw;
        struct rtattr *a = NULL;
        size_t l;
        
        if (ifinfomsg->ifi_family != AF_UNSPEC)
            return;

        if (!(hw = avahi_hashmap_lookup(m->hashmap, &ifinfomsg->ifi_index))) {

            if (!(hw = avahi_new(AvahiHwInterface, 1)))
                return; /* OOM */
            
            hw->monitor = m;
            hw->name = NULL;
            hw->flags = 0;
            hw->mtu = 1500;
            hw->index = (AvahiIfIndex) ifinfomsg->ifi_index;
            hw->mac_address_size = 0;
            hw->entry_group = NULL;

            AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
            AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
            
            avahi_hashmap_insert(m->hashmap, &hw->index, hw);

            if (m->server->fd_ipv4 >= 0)
                new_interface(m, hw, AVAHI_PROTO_INET);
            if (m->server->fd_ipv6 >= 0)
                new_interface(m, hw, AVAHI_PROTO_INET6);
        }
        
        hw->flags = ifinfomsg->ifi_flags;

        l = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
        a = IFLA_RTA(ifinfomsg);

        while (RTA_OK(a, l)) {
            switch(a->rta_type) {
                case IFLA_IFNAME:
                    avahi_free(hw->name);
                    hw->name = avahi_strndup(RTA_DATA(a), RTA_PAYLOAD(a));
                    break;

                case IFLA_MTU:
                    assert(RTA_PAYLOAD(a) == sizeof(unsigned int));
                    hw->mtu = *((unsigned int*) RTA_DATA(a));
                    break;

                case IFLA_ADDRESS: {
                    hw->mac_address_size = RTA_PAYLOAD(a);
                    if (hw->mac_address_size > AVAHI_MAX_MAC_ADDRESS)
                        hw->mac_address_size = AVAHI_MAX_MAC_ADDRESS;
                    
                    memcpy(hw->mac_address, RTA_DATA(a), hw->mac_address_size);
                    break;
                }
                    
                default:
                    ;
            }

            a = RTA_NEXT(a, l);
        }

        update_hw_interface_rr(m, hw, 0);
        check_hw_interface_relevant(m, hw);
        
    } else if (n->nlmsg_type == RTM_DELLINK) {
        struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
        AvahiHwInterface *hw;

        if (ifinfomsg->ifi_family != AF_UNSPEC)
            return;
        
        if (!(hw = avahi_interface_monitor_get_hw_interface(m, (AvahiIfIndex) ifinfomsg->ifi_index)))
            return;

        free_hw_interface(m, hw, 0);
        
    } else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {

        struct ifaddrmsg *ifaddrmsg = NLMSG_DATA(n);
        AvahiInterface *i;
        struct rtattr *a = NULL;
        size_t l;
        AvahiAddress raddr;
        int raddr_valid = 0;

        if (ifaddrmsg->ifa_family != AVAHI_PROTO_INET && ifaddrmsg->ifa_family != AVAHI_PROTO_INET6)
            return;

        if (!(i = (AvahiInterface*) avahi_interface_monitor_get_interface(m, (AvahiIfIndex) ifaddrmsg->ifa_index, (AvahiProtocol) ifaddrmsg->ifa_family)))
            return;

        raddr.family = (AvahiProtocol) ifaddrmsg->ifa_family;

        l = NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg));
        a = IFA_RTA(ifaddrmsg);

        while (RTA_OK(a, l)) {

            switch(a->rta_type) {
                case IFA_ADDRESS:
                    if ((raddr.family == AVAHI_PROTO_INET6 && RTA_PAYLOAD(a) != 16) ||
                        (raddr.family == AVAHI_PROTO_INET && RTA_PAYLOAD(a) != 4))
                        return;

                    memcpy(raddr.data.data, RTA_DATA(a), RTA_PAYLOAD(a));
                    raddr_valid = 1;

                    break;

                default:
                    ;
            }
            
            a = RTA_NEXT(a, l);
        }
        
        if (!raddr_valid)
            return;

        if (n->nlmsg_type == RTM_NEWADDR) {
            AvahiInterfaceAddress *addr;
            
            if (!(addr = get_address(m, i, &raddr))) {
                if (!(addr = avahi_new(AvahiInterfaceAddress, 1)))
                    return; /* OOM */
                
                addr->monitor = m;
                addr->address = raddr;
                addr->interface = i;
                addr->entry_group = NULL;

                AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, addr);
            }
            
            addr->flags = ifaddrmsg->ifa_flags;
            addr->scope = ifaddrmsg->ifa_scope;
            addr->prefix_len = ifaddrmsg->ifa_prefixlen;
        } else {
            AvahiInterfaceAddress *addr;
            
            if (!(addr = get_address(m, i, &raddr)))
                return;

            free_address(m, addr);
        }

        update_interface_rr(m, i, 0);
        check_interface_relevant(m, i);
        
    } else if (n->nlmsg_type == NLMSG_DONE) {
        
        if (m->list == LIST_IFACE) {
            
            if (netlink_list_items(m->netlink, RTM_GETADDR, &m->query_addr_seq) < 0) {
                avahi_log_warn("NETLINK: Failed to list addrs: %s", strerror(errno));
                m->list = LIST_DONE;
            } else
                m->list = LIST_ADDR;

        } else
            /* We're through */
            m->list = LIST_DONE;

        if (m->list == LIST_DONE) {
            check_all_interfaces_relevant(m);
            avahi_update_host_rrs(m, 0);
            avahi_log_info("Network interface enumeration completed.");
        }
        
    } else if (n->nlmsg_type == NLMSG_ERROR && (n->nlmsg_seq == m->query_link_seq || n->nlmsg_seq == m->query_addr_seq)) {
        struct nlmsgerr *e = NLMSG_DATA (n);
                    
        if (e->error)
            avahi_log_warn("NETLINK: Failed to browse: %s", strerror(-e->error));
    }
}

AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
    AvahiInterfaceMonitor *m = NULL;

    if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
        return NULL; /* OOM */
        
    m->server = s;
    if (!(m->netlink = avahi_netlink_new(s->poll_api, RTMGRP_LINK|RTMGRP_IPV4_IFADDR|RTMGRP_IPV6_IFADDR, netlink_callback, m)))
        goto fail;

    m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);

    AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
    AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);

    if (netlink_list_items(m->netlink, RTM_GETLINK, &m->query_link_seq) < 0)
        goto fail;

    m->list = LIST_IFACE;

    return m;

fail:
    avahi_interface_monitor_free(m);
    return NULL;
}

void avahi_interface_monitor_sync(AvahiInterfaceMonitor *m) {
    assert(m);
    
    while (m->list != LIST_DONE) {
        if (!avahi_netlink_work(m->netlink, 1))
            break;
    } 
}

void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
    assert(m);

    while (m->hw_interfaces)
        free_hw_interface(m, m->hw_interfaces, 1);

    assert(!m->interfaces);

    
    if (m->netlink)
        avahi_netlink_free(m->netlink);
    
    if (m->hashmap)
        avahi_hashmap_free(m->hashmap);

    avahi_free(m);
}


AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
    AvahiHwInterface *hw;
    AvahiInterface *i;
    
    assert(m);
    assert(idx > 0);
    assert(protocol != AVAHI_PROTO_UNSPEC);

    if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
        return NULL;

    for (i = hw->interfaces; i; i = i->by_hardware_next)
        if (i->protocol == protocol)
            return i;

    return NULL;
}

AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
    assert(m);
    assert(idx > 0);

    return avahi_hashmap_lookup(m->hashmap, &idx);
}

void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
    assert(i);
    assert(p);
/*     char t[64]; */

    if (!avahi_interface_relevant(i))
        return;
    
    assert(!a || a->family == i->protocol);

/*     if (a) */
/*         avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
/*     else */
/*         avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
    
    if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
        avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, a ? &a->data.ipv4 : NULL, port);
    else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
        avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, a ? &a->data.ipv6 : NULL, port);
}

void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
    assert(i);
    assert(p);

    avahi_interface_send_packet_unicast(i, p, NULL, 0);
}

int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately) {
    assert(i);
    assert(key);

    if (avahi_interface_relevant(i))
        return avahi_query_scheduler_post(i->query_scheduler, key, immediately);

    return 0;
}

int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
    assert(i);
    assert(record);

    if (avahi_interface_relevant(i))
        return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);

    return 0;
}

int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
    assert(i);
    assert(record);
    
    if (avahi_interface_relevant(i))
        return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);

    return 0;
}

int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
    AvahiInterface *i;
    assert(m);

    for (i = m->interfaces; i; i = i->interface_next) {
        if (avahi_interface_relevant(i)) {
            char ln[256];
            snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%i ;;;", i->hardware->name, i->protocol);
            callback(ln, userdata);
            if (avahi_cache_dump(i->cache, callback, userdata) < 0)
                return -1;
        }
    }

    return 0;
}

int avahi_interface_relevant(AvahiInterface *i) {
    AvahiInterfaceAddress *a;
    int relevant_address;
    
    assert(i);

    relevant_address = 0;
    
    for (a = i->addresses; a; a = a->address_next)
        if (avahi_interface_address_relevant(a)) {
            relevant_address = 1;
            break;
        }

/*     avahi_log_debug("%p. iface-relevant: %i %i %i %i %i %i", i, relevant_address, */
/*               (i->hardware->flags & IFF_UP), */
/*               (i->hardware->flags & IFF_RUNNING), */
/*               !(i->hardware->flags & IFF_LOOPBACK), */
/*               (i->hardware->flags & IFF_MULTICAST), */
/*               !(i->hardware->flags & IFF_POINTOPOINT)); */
    
    return
        (i->hardware->flags & IFF_UP) &&
        (!i->monitor->server->config.use_iff_running || (i->hardware->flags & IFF_RUNNING)) &&
        !(i->hardware->flags & IFF_LOOPBACK) &&
        (i->hardware->flags & IFF_MULTICAST) &&
        !(i->hardware->flags & IFF_POINTOPOINT) && 
        relevant_address;
}

int avahi_interface_address_relevant(AvahiInterfaceAddress *a) {
    AvahiInterfaceAddress *b;
    assert(a);

    /* Publish public IP addresses */
    if (a->scope == RT_SCOPE_UNIVERSE ||
        a->scope == RT_SCOPE_SITE)
        return 1;

    if (a->scope == RT_SCOPE_LINK) {
        
        /* Publish link local IP addresses if they are the only ones on the link */
        for (b = a->interface->addresses; b; b = b->address_next) {
            if (b == a)
                continue;
            
            if (b->scope == RT_SCOPE_UNIVERSE ||
                b->scope == RT_SCOPE_SITE)
                return 0;
        }

        return 1;
    }

    return 0;
}

int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
    assert(i);
    
    if (idx > 0 && idx != i->hardware->index)
        return 0;

    if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
        return 0;

    return 1;
}

void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
    assert(m);
    assert(callback);
    
    if (interface > 0) {
        if (protocol != AVAHI_PROTO_UNSPEC) {
            AvahiInterface *i;
            
            if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
                callback(m, i, userdata);
            
        } else {
            AvahiHwInterface *hw;
            AvahiInterface *i;

            if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
                for (i = hw->interfaces; i; i = i->by_hardware_next)
                    if (avahi_interface_match(i, interface, protocol))
                        callback(m, i, userdata);
        }
        
    } else {
        AvahiInterface *i;
        
        for (i = m->interfaces; i; i = i->interface_next)
            if (avahi_interface_match(i, interface, protocol))
                callback(m, i, userdata);
    }
}

void avahi_update_host_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
    AvahiHwInterface *hw;

    assert(m);

    for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
        update_hw_interface_rr(m, hw, remove_rrs);
}

int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
    AvahiInterface *i;
    AvahiInterfaceAddress *ia;
    assert(m);
    assert(a);

    for (i = m->interfaces; i; i = i->interface_next)
        for (ia = i->addresses; ia; ia = ia->address_next)
            if (avahi_address_cmp(a, &ia->address) == 0)
                return 1;

    return 0;
}

int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
    AvahiInterfaceAddress *ia;
    
    assert(i);
    assert(a);

    if (a->family != i->protocol)
        return 0;

    for (ia = i->addresses; ia; ia = ia->address_next) {

        if (a->family == AVAHI_PROTO_INET) {
            uint32_t m;
            
            m = ~(((uint32_t) -1) >> ia->prefix_len);
            
            if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
                return 1;
        } else {
            unsigned j;
            unsigned char pl;
            assert(a->family == AVAHI_PROTO_INET6);

            pl = ia->prefix_len;
            
            for (j = 0; j < 16; j++) {
                uint8_t m;

                if (pl == 0)
                    return 1;
                
                if (pl >= 8) {
                    m = 0xFF;
                    pl -= 8;
                } else {
                    m = ~(0xFF >> pl);
                    pl = 0;
                }
                
                if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
                    break;
            }
        }
    }

    return 0;
}

int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
    AvahiInterface *i;
    AvahiInterfaceAddress *j;
    
    assert(m);
    assert(iface != AVAHI_IF_UNSPEC);
    assert(a);

    if (!(i = avahi_interface_monitor_get_interface(m, iface, a->family)))
        return 0;

    for (j = i->addresses; j; j = j->address_next)
        if (avahi_address_cmp(a, &j->address) == 0)
            return 1;

    return 0;
}