/***
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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <avahi-common/error.h>
#include "avahi-common/avahi-malloc.h"
#include <avahi-common/domain.h>
#include "iface.h"
#include "dns.h"
#include "socket.h"
#include "announce.h"
#include "util.h"
#include "log.h"
#include "multicast-lookup.h"
#include "querier.h"
void avahi_interface_address_update_rrs(AvahiInterfaceAddress *a, int remove_rrs) {
AvahiInterfaceMonitor *m;
assert(a);
m = a->monitor;
if (m->list_complete &&
avahi_interface_address_is_relevant(a) &&
avahi_interface_is_relevant(a->interface) &&
!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[AVAHI_ADDRESS_STR_MAX];
AvahiProtocol p;
p = (a->interface->protocol == AVAHI_PROTO_INET && m->server->config.publish_a_on_ipv6) ||
(a->interface->protocol == AVAHI_PROTO_INET6 && m->server->config.publish_aaaa_on_ipv4) ? AVAHI_PROTO_UNSPEC : a->interface->protocol;
avahi_address_snprint(t, sizeof(t), &a->address);
avahi_log_info("Registering new address record for %s on %s.%s.", t, a->interface->hardware->name, p == AVAHI_PROTO_UNSPEC ? "*" : avahi_proto_to_string(p));
if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, p, 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[AVAHI_ADDRESS_STR_MAX];
avahi_address_snprint(t, sizeof(t), &a->address);
avahi_log_info("Withdrawing address record for %s on %s.", t, a->interface->hardware->name);
if (avahi_s_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING &&
m->server->state == AVAHI_SERVER_REGISTERING)
avahi_server_decrease_host_rr_pending(m->server);
avahi_s_entry_group_reset(a->entry_group);
}
}
}
void avahi_interface_update_rrs(AvahiInterface *i, int remove_rrs) {
AvahiInterfaceAddress *a;
assert(i);
for (a = i->addresses; a; a = a->address_next)
avahi_interface_address_update_rrs(a, remove_rrs);
}
void avahi_hw_interface_update_rrs(AvahiHwInterface *hw, int remove_rrs) {
AvahiInterface *i;
AvahiInterfaceMonitor *m;
assert(hw);
m = hw->monitor;
for (i = hw->interfaces; i; i = i->by_hardware_next)
avahi_interface_update_rrs(i, remove_rrs);
if (m->list_complete &&
!remove_rrs &&
m->server->config.publish_workstation &&
(m->server->state == AVAHI_SERVER_RUNNING)) {
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[AVAHI_LABEL_MAX], unescaped[AVAHI_LABEL_MAX], mac[256];
const char *p = m->server->host_name;
avahi_unescape_label(&p, unescaped, sizeof(unescaped));
avahi_format_mac_address(mac, sizeof(mac), hw->mac_address, hw->mac_address_size);
snprintf(name, sizeof(name), "%s [%s]", unescaped, mac);
if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, 0, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
avahi_log_warn(__FILE__": avahi_server_add_service() failed: %s", avahi_strerror(m->server->error));
avahi_s_entry_group_free(hw->entry_group);
hw->entry_group = NULL;
} else
avahi_s_entry_group_commit(hw->entry_group);
}
} else {
if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
avahi_log_info("Withdrawing workstation service for %s.", hw->name);
if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING &&
m->server->state == AVAHI_SERVER_REGISTERING)
avahi_server_decrease_host_rr_pending(m->server);
avahi_s_entry_group_reset(hw->entry_group);
}
}
}
void avahi_interface_monitor_update_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
AvahiHwInterface *hw;
assert(m);
for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
avahi_hw_interface_update_rrs(hw, remove_rrs);
}
static int interface_mdns_mcast_join(AvahiInterface *i, int join) {
char at[AVAHI_ADDRESS_STR_MAX];
int r;
assert(i);
if (!!join == !!i->mcast_joined)
return 0;
if ((i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 < 0) ||
(i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 < 0))
return -1;
if (join) {
AvahiInterfaceAddress *a;
/* Look if there's an address with global scope */
for (a = i->addresses; a; a = a->address_next)
if (a->global_scope)
break;
/* No address with a global scope has been found, so let's use
* any. */
if (!a)
a = i->addresses;
/* Hmm, there is no address available. */
if (!a)
return -1;
i->local_mcast_address = a->address;
}
avahi_log_info("%s mDNS multicast group on interface %s.%s with address %s.",
join ? "Joining" : "Leaving",
i->hardware->name,
avahi_proto_to_string(i->protocol),
avahi_address_snprint(at, sizeof(at), &i->local_mcast_address));
if (i->protocol == AVAHI_PROTO_INET6)
r = avahi_mdns_mcast_join_ipv6(i->monitor->server->fd_ipv6, &i->local_mcast_address.data.ipv6, i->hardware->index, join);
else {
assert(i->protocol == AVAHI_PROTO_INET);
r = avahi_mdns_mcast_join_ipv4(i->monitor->server->fd_ipv4, &i->local_mcast_address.data.ipv4, i->hardware->index, join);
}
if (r < 0)
i->mcast_joined = 0;
else
i->mcast_joined = join;
return 0;
}
static int interface_mdns_mcast_rejoin(AvahiInterface *i) {
AvahiInterfaceAddress *a, *usable = NULL, *found = NULL;
assert(i);
if (!i->mcast_joined)
return 0;
/* Check whether old address we joined with is still available. If
* not, rejoin using an other address. */
for (a = i->addresses; a; a = a->address_next) {
if (a->global_scope && !usable)
usable = a;
if (avahi_address_cmp(&a->address, &i->local_mcast_address) == 0) {
if (a->global_scope)
/* No action necessary: the address still exists and
* has global scope. */
return 0;
found = a;
}
}
if (found && !usable)
/* No action necessary: the address still exists and no better one has been found */
return 0;
interface_mdns_mcast_join(i, 0);
return interface_mdns_mcast_join(i, 1);
}
void avahi_interface_address_free(AvahiInterfaceAddress *a) {
assert(a);
assert(a->interface);
avahi_interface_address_update_rrs(a, 1);
AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
if (a->entry_group)
avahi_s_entry_group_free(a->entry_group);
interface_mdns_mcast_rejoin(a->interface);
avahi_free(a);
}
void avahi_interface_free(AvahiInterface *i, int send_goodbye) {
assert(i);
/* Handle goodbyes and remove announcers */
avahi_goodbye_interface(i->monitor->server, i, send_goodbye, 1);
avahi_response_scheduler_force(i->response_scheduler);
assert(!i->announcers);
if (i->mcast_joined)
interface_mdns_mcast_join(i, 0);
/* Remove queriers */
avahi_querier_free_all(i);
avahi_hashmap_free(i->queriers_by_key);
/* Remove local RRs */
avahi_interface_update_rrs(i, 1);
while (i->addresses)
avahi_interface_address_free(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, i->monitor->interfaces, i);
AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
avahi_free(i);
}
void avahi_hw_interface_free(AvahiHwInterface *hw, int send_goodbye) {
assert(hw);
avahi_hw_interface_update_rrs(hw, 1);
while (hw->interfaces)
avahi_interface_free(hw->interfaces, send_goodbye);
if (hw->entry_group)
avahi_s_entry_group_free(hw->entry_group);
AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, hw->monitor->hw_interfaces, hw);
avahi_hashmap_remove(hw->monitor->hashmap, &hw->index);
avahi_free(hw->name);
avahi_free(hw);
}
AvahiInterface* avahi_interface_new(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
AvahiInterface *i;
assert(m);
assert(hw);
assert(AVAHI_PROTO_VALID(protocol));
if (!(i = avahi_new(AvahiInterface, 1)))
goto fail; /* OOM */
i->monitor = m;
i->hardware = hw;
i->protocol = protocol;
i->announcing = 0;
i->mcast_joined = 0;
AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
AVAHI_LLIST_HEAD_INIT(AvahiAnnouncer, i->announcers);
AVAHI_LLIST_HEAD_INIT(AvahiQuerier, i->queriers);
i->queriers_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
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 i;
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);
}
return NULL;
}
AvahiHwInterface *avahi_hw_interface_new(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
AvahiHwInterface *hw;
assert(m);
assert(AVAHI_IF_VALID(idx));
if (!(hw = avahi_new(AvahiHwInterface, 1)))
return NULL;
hw->monitor = m;
hw->name = NULL;
hw->flags_ok = 0;
hw->mtu = 1500;
hw->index = idx;
hw->mac_address_size = 0;
hw->entry_group = NULL;
hw->ratelimit_begin.tv_sec = 0;
hw->ratelimit_begin.tv_usec = 0;
hw->ratelimit_counter = 0;
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 || m->server->config.publish_a_on_ipv6)
avahi_interface_new(m, hw, AVAHI_PROTO_INET);
if (m->server->fd_ipv6 >= 0 || m->server->config.publish_aaaa_on_ipv4)
avahi_interface_new(m, hw, AVAHI_PROTO_INET6);
return hw;
}
AvahiInterfaceAddress *avahi_interface_address_new(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *addr, unsigned prefix_len) {
AvahiInterfaceAddress *a;
assert(m);
assert(i);
if (!(a = avahi_new(AvahiInterfaceAddress, 1)))
return NULL;
a->interface = i;
a->monitor = m;
a->address = *addr;
a->prefix_len = prefix_len;
a->global_scope = 0;
a->deprecated = 0;
a->entry_group = NULL;
AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, a);
return a;
}
void avahi_interface_check_relevant(AvahiInterface *i) {
int b;
AvahiInterfaceMonitor *m;
assert(i);
m = i->monitor;
b = avahi_interface_is_relevant(i);
if (m->list_complete && b && !i->announcing) {
interface_mdns_mcast_join(i, 1);
if (i->mcast_joined) {
avahi_log_info("New relevant interface %s.%s for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol));
i->announcing = 1;
avahi_announce_interface(m->server, i);
avahi_multicast_lookup_engine_new_interface(m->server->multicast_lookup_engine, i);
}
} else if (!b && i->announcing) {
avahi_log_info("Interface %s.%s no longer relevant for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol));
interface_mdns_mcast_join(i, 0);
avahi_goodbye_interface(m->server, i, 0, 1);
avahi_querier_free_all(i);
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;
} else
interface_mdns_mcast_rejoin(i);
}
void avahi_hw_interface_check_relevant(AvahiHwInterface *hw) {
AvahiInterface *i;
assert(hw);
for (i = hw->interfaces; i; i = i->by_hardware_next)
avahi_interface_check_relevant(i);
}
void avahi_interface_monitor_check_relevant(AvahiInterfaceMonitor *m) {
AvahiInterface *i;
assert(m);
for (i = m->interfaces; i; i = i->interface_next)
avahi_interface_check_relevant(i);
}
AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
AvahiInterfaceMonitor *m = NULL;
if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
return NULL; /* OOM */
m->server = s;
m->list_complete = 0;
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 (avahi_interface_monitor_init_osdep(m) < 0)
goto fail;
return m;
fail:
avahi_interface_monitor_free(m);
return NULL;
}
void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
assert(m);
while (m->hw_interfaces)
avahi_hw_interface_free(m->hw_interfaces, 1);
assert(!m->interfaces);
avahi_interface_monitor_free_osdep(m);
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);
}
AvahiInterfaceAddress* avahi_interface_monitor_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;
}
void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
assert(i);
assert(p);
if (!i->announcing)
return;
assert(!a || a->proto == i->protocol);
if (i->monitor->server->config.ratelimit_interval > 0) {
struct timeval now, end;
gettimeofday(&now, NULL);
end = i->hardware->ratelimit_begin;
avahi_timeval_add(&end, i->monitor->server->config.ratelimit_interval);
if (i->hardware->ratelimit_begin.tv_sec <= 0 ||
avahi_timeval_compare(&end, &now) < 0) {
i->hardware->ratelimit_begin = now;
i->hardware->ratelimit_counter = 0;
}
if (i->hardware->ratelimit_counter > i->monitor->server->config.ratelimit_burst)
return;
i->hardware->ratelimit_counter++;
}
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, i->mcast_joined ? &i->local_mcast_address.data.ipv4 : NULL, 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, i->mcast_joined ? &i->local_mcast_address.data.ipv6 : NULL, 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, unsigned *ret_id) {
assert(i);
assert(key);
if (!i->announcing)
return 0;
return avahi_query_scheduler_post(i->query_scheduler, key, immediately, ret_id);
}
int avahi_interface_withraw_query(AvahiInterface *i, unsigned id) {
return avahi_query_scheduler_withdraw_by_id(i->query_scheduler, id);
}
int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
assert(i);
assert(record);
if (!i->announcing)
return 0;
return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
}
int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
assert(i);
assert(record);
if (!i->announcing)
return 0;
return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
}
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_is_relevant(i)) {
char ln[256];
snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%s ;;;", i->hardware->name, avahi_proto_to_string(i->protocol));
callback(ln, userdata);
if (avahi_cache_dump(i->cache, callback, userdata) < 0)
return -1;
}
}
return 0;
}
static int avahi_interface_is_relevant_internal(AvahiInterface *i) {
AvahiInterfaceAddress *a;
assert(i);
if (!i->hardware->flags_ok)
return 0;
for (a = i->addresses; a; a = a->address_next)
if (avahi_interface_address_is_relevant(a))
return 1;
return 0;
}
int avahi_interface_is_relevant(AvahiInterface *i) {
AvahiStringList *l;
assert(i);
for (l = i->monitor->server->config.deny_interfaces; l; l = l->next)
if (strcasecmp((char*) l->text, i->hardware->name) == 0)
return 0;
if (i->monitor->server->config.allow_interfaces) {
for (l = i->monitor->server->config.allow_interfaces; l; l = l->next)
if (strcasecmp((char*) l->text, i->hardware->name) == 0)
goto good;
return 0;
}
good:
return avahi_interface_is_relevant_internal(i);
}
int avahi_interface_address_is_relevant(AvahiInterfaceAddress *a) {
AvahiInterfaceAddress *b;
assert(a);
/* Publish public and non-deprecated IP addresses */
if (a->global_scope && !a->deprecated)
return 1;
/* Publish link-local and deprecated IP addresses only 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->global_scope && !b->deprecated)
return 0;
}
return 1;
}
int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
assert(i);
if (idx != AVAHI_IF_UNSPEC && 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 != AVAHI_IF_UNSPEC) {
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);
}
}
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->proto != i->protocol)
return 0;
for (ia = i->addresses; ia; ia = ia->address_next) {
if (a->proto == 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->proto == 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->proto)))
return 0;
for (j = i->addresses; j; j = j->address_next)
if (avahi_address_cmp(a, &j->address) == 0)
return 1;
return 0;
}
AvahiIfIndex avahi_find_interface_for_address(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
AvahiInterface *i;
assert(m);
/* Some stupid OS don't support passing the interface index when a
* packet is received. We have to work around that limitation by
* looking for an interface that has the incoming address
* attached. This is sometimes ambiguous, but we have to live with
* it. */
for (i = m->interfaces; i; i = i->interface_next) {
AvahiInterfaceAddress *ai;
if (i->protocol != a->proto)
continue;
for (ai = i->addresses; ai; ai = ai->address_next)
if (avahi_address_cmp(a, &ai->address) == 0)
return i->hardware->index;
}
return AVAHI_IF_UNSPEC;
}