diff options
Diffstat (limited to 'trunk/avahi-core/iface.c')
| -rw-r--r-- | trunk/avahi-core/iface.c | 812 |
1 files changed, 812 insertions, 0 deletions
diff --git a/trunk/avahi-core/iface.c b/trunk/avahi-core/iface.c new file mode 100644 index 0000000..5685618 --- /dev/null +++ b/trunk/avahi-core/iface.c @@ -0,0 +1,812 @@ +/* $Id$ */ + +/*** + 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 <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/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 (a->interface->announcing && + m->list_complete && + avahi_interface_address_is_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[AVAHI_ADDRESS_STR_MAX]; + avahi_address_snprint(t, sizeof(t), &a->address); + + avahi_log_info("Registering new address record for %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[AVAHI_ADDRESS_STR_MAX]; + avahi_address_snprint(t, sizeof(t), &a->address); + + 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_log_info("Withdrawing address record for %s on %s.", t, a->interface->hardware->name); + + 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], mac[256]; + + avahi_format_mac_address(mac, sizeof(mac), hw->mac_address, hw->mac_address_size); + snprintf(name, sizeof(name), "%s [%s]", m->server->host_name, 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)) { + + 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); + } + } +} + +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 (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) { + avahi_log_warn(__FILE__": interface_mdns_mcast_join() called but no local address available."); + 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; + + 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) + avahi_interface_new(m, hw, AVAHI_PROTO_INET); + if (m->server->fd_ipv6 >= 0) + 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->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) { + avahi_log_info("New relevant interface %s.%s for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol)); + + interface_mdns_mcast_join(i, 1); + + 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 (!avahi_interface_is_relevant(i)) + return; + + assert(!a || a->proto == 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, 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 (avahi_interface_is_relevant(i)) + return avahi_query_scheduler_post(i->query_scheduler, key, immediately, ret_id); + + return 0; +} + +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 (avahi_interface_is_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_is_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_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; +} + +int avahi_interface_is_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_is_relevant(a)) { + relevant_address = 1; + break; + } + + return i->hardware->flags_ok && relevant_address; +} + +int avahi_interface_address_is_relevant(AvahiInterfaceAddress *a) { + AvahiInterfaceAddress *b; + assert(a); + + /* Publish public IP addresses */ + if (a->global_scope) + return 1; + else { + + /* 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->global_scope) + return 0; + } + + return 1; + } + + return 0; +} + +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 recieved. 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; +} |