X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=src%2Fserver.c;fp=src%2Fserver.c;h=0d6d993a91f925066b8102ceac8bf7fa1b6f66ba;hb=37d19f15523b6fe4d1fef2329abe421221b3d4b3;hp=0000000000000000000000000000000000000000;hpb=e8d28c50c6d3a73d1a6f514095304bfe0973ff2a;p=catta diff --git a/src/server.c b/src/server.c new file mode 100644 index 0000000..0d6d993 --- /dev/null +++ b/src/server.c @@ -0,0 +1,1806 @@ +/*** + 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 +#endif + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include "internal.h" +#include "iface.h" +#include "socket.h" +#include "browse.h" +#include "util.h" +#include "dns-srv-rr.h" +#include "addr-util.h" +#include "domain-util.h" +#include "rr-util.h" + +#define AVAHI_DEFAULT_CACHE_ENTRIES_MAX 4096 + +static void enum_aux_records(AvahiServer *s, AvahiInterface *i, const char *name, uint16_t type, void (*callback)(AvahiServer *s, AvahiRecord *r, int flush_cache, void* userdata), void* userdata) { + assert(s); + assert(i); + assert(name); + assert(callback); + + if (type == AVAHI_DNS_TYPE_ANY) { + AvahiEntry *e; + + for (e = s->entries; e; e = e->entries_next) + if (!e->dead && + avahi_entry_is_registered(s, e, i) && + e->record->key->clazz == AVAHI_DNS_CLASS_IN && + avahi_domain_equal(name, e->record->key->name)) + callback(s, e->record, e->flags & AVAHI_PUBLISH_UNIQUE, userdata); + + } else { + AvahiEntry *e; + AvahiKey *k; + + if (!(k = avahi_key_new(name, AVAHI_DNS_CLASS_IN, type))) + return; /** OOM */ + + for (e = avahi_hashmap_lookup(s->entries_by_key, k); e; e = e->by_key_next) + if (!e->dead && avahi_entry_is_registered(s, e, i)) + callback(s, e->record, e->flags & AVAHI_PUBLISH_UNIQUE, userdata); + + avahi_key_unref(k); + } +} + +void avahi_server_enumerate_aux_records(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, void (*callback)(AvahiServer *s, AvahiRecord *r, int flush_cache, void* userdata), void* userdata) { + assert(s); + assert(i); + assert(r); + assert(callback); + + /* Call the specified callback far all records referenced by the one specified in *r */ + + if (r->key->clazz == AVAHI_DNS_CLASS_IN) { + if (r->key->type == AVAHI_DNS_TYPE_PTR) { + enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_SRV, callback, userdata); + enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_TXT, callback, userdata); + } else if (r->key->type == AVAHI_DNS_TYPE_SRV) { + enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_A, callback, userdata); + enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_AAAA, callback, userdata); + } else if (r->key->type == AVAHI_DNS_TYPE_CNAME) + enum_aux_records(s, i, r->data.cname.name, AVAHI_DNS_TYPE_ANY, callback, userdata); + } +} + +void avahi_server_prepare_response(AvahiServer *s, AvahiInterface *i, AvahiEntry *e, int unicast_response, int auxiliary) { + assert(s); + assert(i); + assert(e); + + avahi_record_list_push(s->record_list, e->record, e->flags & AVAHI_PUBLISH_UNIQUE, unicast_response, auxiliary); +} + +void avahi_server_prepare_matching_responses(AvahiServer *s, AvahiInterface *i, AvahiKey *k, int unicast_response) { + assert(s); + assert(i); + assert(k); + + /* Push all records that match the specified key to the record list */ + + if (avahi_key_is_pattern(k)) { + AvahiEntry *e; + + /* Handle ANY query */ + + for (e = s->entries; e; e = e->entries_next) + if (!e->dead && avahi_key_pattern_match(k, e->record->key) && avahi_entry_is_registered(s, e, i)) + avahi_server_prepare_response(s, i, e, unicast_response, 0); + + } else { + AvahiEntry *e; + + /* Handle all other queries */ + + for (e = avahi_hashmap_lookup(s->entries_by_key, k); e; e = e->by_key_next) + if (!e->dead && avahi_entry_is_registered(s, e, i)) + avahi_server_prepare_response(s, i, e, unicast_response, 0); + } + + /* Look for CNAME records */ + + if ((k->clazz == AVAHI_DNS_CLASS_IN || k->clazz == AVAHI_DNS_CLASS_ANY) + && k->type != AVAHI_DNS_TYPE_CNAME && k->type != AVAHI_DNS_TYPE_ANY) { + + AvahiKey *cname_key; + + if (!(cname_key = avahi_key_new(k->name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_CNAME))) + return; + + avahi_server_prepare_matching_responses(s, i, cname_key, unicast_response); + avahi_key_unref(cname_key); + } +} + +static void withdraw_entry(AvahiServer *s, AvahiEntry *e) { + assert(s); + assert(e); + + /* Withdraw the specified entry, and if is part of an entry group, + * put that into COLLISION state */ + + if (e->dead) + return; + + if (e->group) { + AvahiEntry *k; + + for (k = e->group->entries; k; k = k->by_group_next) + if (!k->dead) { + avahi_goodbye_entry(s, k, 0, 1); + k->dead = 1; + } + + e->group->n_probing = 0; + + avahi_s_entry_group_change_state(e->group, AVAHI_ENTRY_GROUP_COLLISION); + } else { + avahi_goodbye_entry(s, e, 0, 1); + e->dead = 1; + } + + s->need_entry_cleanup = 1; +} + +static void withdraw_rrset(AvahiServer *s, AvahiKey *key) { + AvahiEntry *e; + + assert(s); + assert(key); + + /* Withdraw an entry RRSset */ + + for (e = avahi_hashmap_lookup(s->entries_by_key, key); e; e = e->by_key_next) + withdraw_entry(s, e); +} + +static void incoming_probe(AvahiServer *s, AvahiRecord *record, AvahiInterface *i) { + AvahiEntry *e, *n; + int ours = 0, won = 0, lost = 0; + + assert(s); + assert(record); + assert(i); + + /* Handle incoming probes and check if they conflict our own probes */ + + for (e = avahi_hashmap_lookup(s->entries_by_key, record->key); e; e = n) { + int cmp; + n = e->by_key_next; + + if (e->dead) + continue; + + if ((cmp = avahi_record_lexicographical_compare(e->record, record)) == 0) { + ours = 1; + break; + } else { + + if (avahi_entry_is_probing(s, e, i)) { + if (cmp > 0) + won = 1; + else /* cmp < 0 */ + lost = 1; + } + } + } + + if (!ours) { + char *t = avahi_record_to_string(record); + + if (won) + avahi_log_debug("Received conflicting probe [%s]. Local host won.", t); + else if (lost) { + avahi_log_debug("Received conflicting probe [%s]. Local host lost. Withdrawing.", t); + withdraw_rrset(s, record->key); + } + + avahi_free(t); + } +} + +static int handle_conflict(AvahiServer *s, AvahiInterface *i, AvahiRecord *record, int unique) { + int valid = 1, ours = 0, conflict = 0, withdraw_immediately = 0; + AvahiEntry *e, *n, *conflicting_entry = NULL; + + assert(s); + assert(i); + assert(record); + + /* Check whether an incoming record conflicts with one of our own */ + + for (e = avahi_hashmap_lookup(s->entries_by_key, record->key); e; e = n) { + n = e->by_key_next; + + if (e->dead) + continue; + + /* Check if the incoming is a goodbye record */ + if (avahi_record_is_goodbye(record)) { + + if (avahi_record_equal_no_ttl(e->record, record)) { + char *t; + + /* Refresh */ + t = avahi_record_to_string(record); + avahi_log_debug("Received goodbye record for one of our records [%s]. Refreshing.", t); + avahi_server_prepare_matching_responses(s, i, e->record->key, 0); + + valid = 0; + avahi_free(t); + break; + } + + /* If the goodybe packet doesn't match one of our own RRs, we simply ignore it. */ + continue; + } + + if (!(e->flags & AVAHI_PUBLISH_UNIQUE) && !unique) + continue; + + /* Either our entry or the other is intended to be unique, so let's check */ + + if (avahi_record_equal_no_ttl(e->record, record)) { + ours = 1; /* We have an identical record, so this is no conflict */ + + /* Check wheter there is a TTL conflict */ + if (record->ttl <= e->record->ttl/2 && + avahi_entry_is_registered(s, e, i)) { + char *t; + /* Refresh */ + t = avahi_record_to_string(record); + + avahi_log_debug("Received record with bad TTL [%s]. Refreshing.", t); + avahi_server_prepare_matching_responses(s, i, e->record->key, 0); + valid = 0; + + avahi_free(t); + } + + /* There's no need to check the other entries of this RRset */ + break; + + } else { + + if (avahi_entry_is_registered(s, e, i)) { + + /* A conflict => we have to return to probe mode */ + conflict = 1; + conflicting_entry = e; + + } else if (avahi_entry_is_probing(s, e, i)) { + + /* We are currently registering a matching record, but + * someone else already claimed it, so let's + * withdraw */ + conflict = 1; + withdraw_immediately = 1; + } + } + } + + if (!ours && conflict) { + char *t; + + valid = 0; + + t = avahi_record_to_string(record); + + if (withdraw_immediately) { + avahi_log_debug("Received conflicting record [%s] with local record to be. Withdrawing.", t); + withdraw_rrset(s, record->key); + } else { + assert(conflicting_entry); + avahi_log_debug("Received conflicting record [%s]. Resetting our record.", t); + avahi_entry_return_to_initial_state(s, conflicting_entry, i); + + /* Local unique records are returned to probing + * state. Local shared records are reannounced. */ + } + + avahi_free(t); + } + + return valid; +} + +static void append_aux_callback(AvahiServer *s, AvahiRecord *r, int flush_cache, void* userdata) { + int *unicast_response = userdata; + + assert(s); + assert(r); + assert(unicast_response); + + avahi_record_list_push(s->record_list, r, flush_cache, *unicast_response, 1); +} + +static void append_aux_records_to_list(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, int unicast_response) { + assert(s); + assert(r); + + avahi_server_enumerate_aux_records(s, i, r, append_aux_callback, &unicast_response); +} + +void avahi_server_generate_response(AvahiServer *s, AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port, int legacy_unicast, int immediately) { + + assert(s); + assert(i); + assert(!legacy_unicast || (a && port > 0 && p)); + + if (legacy_unicast) { + AvahiDnsPacket *reply; + AvahiRecord *r; + + if (!(reply = avahi_dns_packet_new_reply(p, 512 + AVAHI_DNS_PACKET_EXTRA_SIZE /* unicast DNS maximum packet size is 512 */ , 1, 1))) + return; /* OOM */ + + while ((r = avahi_record_list_next(s->record_list, NULL, NULL, NULL))) { + + append_aux_records_to_list(s, i, r, 0); + + if (avahi_dns_packet_append_record(reply, r, 0, 10)) + avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT); + else { + char *t = avahi_record_to_string(r); + avahi_log_warn("Record [%s] not fitting in legacy unicast packet, dropping.", t); + avahi_free(t); + } + + avahi_record_unref(r); + } + + if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0) + avahi_interface_send_packet_unicast(i, reply, a, port); + + avahi_dns_packet_free(reply); + + } else { + int unicast_response, flush_cache, auxiliary; + AvahiDnsPacket *reply = NULL; + AvahiRecord *r; + + /* In case the query packet was truncated never respond + immediately, because known answer suppression records might be + contained in later packets */ + int tc = p && !!(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_TC); + + while ((r = avahi_record_list_next(s->record_list, &flush_cache, &unicast_response, &auxiliary))) { + + int im = immediately; + + /* Only send the response immediately if it contains a + * unique entry AND it is not in reply to a truncated + * packet AND it is not an auxiliary record AND all other + * responses for this record are unique too. */ + + if (flush_cache && !tc && !auxiliary && avahi_record_list_all_flush_cache(s->record_list)) + im = 1; + + if (!avahi_interface_post_response(i, r, flush_cache, a, im) && unicast_response) { + + /* Due to some reasons the record has not been scheduled. + * The client requested an unicast response in that + * case. Therefore we prepare such a response */ + + append_aux_records_to_list(s, i, r, unicast_response); + + for (;;) { + + if (!reply) { + assert(p); + + if (!(reply = avahi_dns_packet_new_reply(p, i->hardware->mtu, 0, 0))) + break; /* OOM */ + } + + if (avahi_dns_packet_append_record(reply, r, flush_cache, 0)) { + + /* Appending this record succeeded, so incremeant + * the specific header field, and return to the caller */ + + avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT); + break; + } + + if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) == 0) { + size_t size; + + /* The record is too large for one packet, so create a larger packet */ + + avahi_dns_packet_free(reply); + size = avahi_record_get_estimate_size(r) + AVAHI_DNS_PACKET_HEADER_SIZE; + + if (!(reply = avahi_dns_packet_new_reply(p, size + AVAHI_DNS_PACKET_EXTRA_SIZE, 0, 1))) + break; /* OOM */ + + if (avahi_dns_packet_append_record(reply, r, flush_cache, 0)) { + + /* Appending this record succeeded, so incremeant + * the specific header field, and return to the caller */ + + avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT); + break; + + } else { + + /* We completely fucked up, there's + * nothing we can do. The RR just doesn't + * fit in. Let's ignore it. */ + + char *t; + avahi_dns_packet_free(reply); + reply = NULL; + t = avahi_record_to_string(r); + avahi_log_warn("Record [%s] too large, doesn't fit in any packet!", t); + avahi_free(t); + break; + } + } + + /* Appending the record didn't succeeed, so let's send this packet, and create a new one */ + avahi_interface_send_packet_unicast(i, reply, a, port); + avahi_dns_packet_free(reply); + reply = NULL; + } + } + + avahi_record_unref(r); + } + + if (reply) { + if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0) + avahi_interface_send_packet_unicast(i, reply, a, port); + avahi_dns_packet_free(reply); + } + } + + avahi_record_list_flush(s->record_list); +} + +static void reflect_response(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, int flush_cache) { + AvahiInterface *j; + + assert(s); + assert(i); + assert(r); + + if (!s->config.enable_reflector) + return; + + for (j = s->monitor->interfaces; j; j = j->interface_next) + if (j != i && (s->config.reflect_ipv || j->protocol == i->protocol)) + avahi_interface_post_response(j, r, flush_cache, NULL, 1); +} + +static void* reflect_cache_walk_callback(AvahiCache *c, AvahiKey *pattern, AvahiCacheEntry *e, void* userdata) { + AvahiServer *s = userdata; + AvahiRecord* r; + + assert(c); + assert(pattern); + assert(e); + assert(s); + + /* Don't reflect cache entry with ipv6 link-local addresses. */ + r = e->record; + if ((r->key->type == AVAHI_DNS_TYPE_AAAA) && + (r->data.aaaa.address.address[0] == 0xFE) && + (r->data.aaaa.address.address[1] == 0x80)) + return NULL; + + avahi_record_list_push(s->record_list, e->record, e->cache_flush, 0, 0); + return NULL; +} + +static void reflect_query(AvahiServer *s, AvahiInterface *i, AvahiKey *k) { + AvahiInterface *j; + + assert(s); + assert(i); + assert(k); + + if (!s->config.enable_reflector) + return; + + for (j = s->monitor->interfaces; j; j = j->interface_next) + if (j != i && (s->config.reflect_ipv || j->protocol == i->protocol)) { + /* Post the query to other networks */ + avahi_interface_post_query(j, k, 1, NULL); + + /* Reply from caches of other network. This is needed to + * "work around" known answer suppression. */ + + avahi_cache_walk(j->cache, k, reflect_cache_walk_callback, s); + } +} + +static void reflect_probe(AvahiServer *s, AvahiInterface *i, AvahiRecord *r) { + AvahiInterface *j; + + assert(s); + assert(i); + assert(r); + + if (!s->config.enable_reflector) + return; + + for (j = s->monitor->interfaces; j; j = j->interface_next) + if (j != i && (s->config.reflect_ipv || j->protocol == i->protocol)) + avahi_interface_post_probe(j, r, 1); +} + +static void handle_query_packet(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, uint16_t port, int legacy_unicast, int from_local_iface) { + size_t n; + int is_probe; + + assert(s); + assert(p); + assert(i); + assert(a); + + assert(avahi_record_list_is_empty(s->record_list)); + + is_probe = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) > 0; + + /* Handle the questions */ + for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT); n > 0; n --) { + AvahiKey *key; + int unicast_response = 0; + + if (!(key = avahi_dns_packet_consume_key(p, &unicast_response))) { + avahi_log_warn(__FILE__": Packet too short or invalid while reading question key. (Maybe a UTF-8 problem?)"); + goto fail; + } + + if (!legacy_unicast && !from_local_iface) { + reflect_query(s, i, key); + if (!unicast_response) + avahi_cache_start_poof(i->cache, key, a); + } + + if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0 && + !(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_TC)) + /* Allow our own queries to be suppressed by incoming + * queries only when they do not include known answers */ + avahi_query_scheduler_incoming(i->query_scheduler, key); + + avahi_server_prepare_matching_responses(s, i, key, unicast_response); + avahi_key_unref(key); + } + + if (!legacy_unicast) { + + /* Known Answer Suppression */ + for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT); n > 0; n --) { + AvahiRecord *record; + int unique = 0; + + if (!(record = avahi_dns_packet_consume_record(p, &unique))) { + avahi_log_warn(__FILE__": Packet too short or invalid while reading known answer record. (Maybe a UTF-8 problem?)"); + goto fail; + } + + avahi_response_scheduler_suppress(i->response_scheduler, record, a); + avahi_record_list_drop(s->record_list, record); + avahi_cache_stop_poof(i->cache, record, a); + + avahi_record_unref(record); + } + + /* Probe record */ + for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT); n > 0; n --) { + AvahiRecord *record; + int unique = 0; + + if (!(record = avahi_dns_packet_consume_record(p, &unique))) { + avahi_log_warn(__FILE__": Packet too short or invalid while reading probe record. (Maybe a UTF-8 problem?)"); + goto fail; + } + + if (!avahi_key_is_pattern(record->key)) { + if (!from_local_iface) + reflect_probe(s, i, record); + incoming_probe(s, record, i); + } + + avahi_record_unref(record); + } + } + + if (!avahi_record_list_is_empty(s->record_list)) + avahi_server_generate_response(s, i, p, a, port, legacy_unicast, is_probe); + + return; + +fail: + avahi_record_list_flush(s->record_list); +} + +static void handle_response_packet(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, int from_local_iface) { + unsigned n; + + assert(s); + assert(p); + assert(i); + assert(a); + + for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) + + avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT); n > 0; n--) { + AvahiRecord *record; + int cache_flush = 0; + + if (!(record = avahi_dns_packet_consume_record(p, &cache_flush))) { + avahi_log_warn(__FILE__": Packet too short or invalid while reading response record. (Maybe a UTF-8 problem?)"); + break; + } + + if (!avahi_key_is_pattern(record->key)) { + + if (handle_conflict(s, i, record, cache_flush)) { + if (!from_local_iface && !avahi_record_is_link_local_address(record)) + reflect_response(s, i, record, cache_flush); + avahi_cache_update(i->cache, record, cache_flush, a); + avahi_response_scheduler_incoming(i->response_scheduler, record, cache_flush); + } + } + + avahi_record_unref(record); + } + + /* If the incoming response contained a conflicting record, some + records have been scheduled for sending. We need to flush them + here. */ + if (!avahi_record_list_is_empty(s->record_list)) + avahi_server_generate_response(s, i, NULL, NULL, 0, 0, 1); +} + +static AvahiLegacyUnicastReflectSlot* allocate_slot(AvahiServer *s) { + unsigned n, idx = (unsigned) -1; + AvahiLegacyUnicastReflectSlot *slot; + + assert(s); + + if (!s->legacy_unicast_reflect_slots) + s->legacy_unicast_reflect_slots = avahi_new0(AvahiLegacyUnicastReflectSlot*, AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX); + + for (n = 0; n < AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX; n++, s->legacy_unicast_reflect_id++) { + idx = s->legacy_unicast_reflect_id % AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX; + + if (!s->legacy_unicast_reflect_slots[idx]) + break; + } + + if (idx == (unsigned) -1 || s->legacy_unicast_reflect_slots[idx]) + return NULL; + + if (!(slot = avahi_new(AvahiLegacyUnicastReflectSlot, 1))) + return NULL; /* OOM */ + + s->legacy_unicast_reflect_slots[idx] = slot; + slot->id = s->legacy_unicast_reflect_id++; + slot->server = s; + + return slot; +} + +static void deallocate_slot(AvahiServer *s, AvahiLegacyUnicastReflectSlot *slot) { + unsigned idx; + + assert(s); + assert(slot); + + idx = slot->id % AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX; + + assert(s->legacy_unicast_reflect_slots[idx] == slot); + + avahi_time_event_free(slot->time_event); + + avahi_free(slot); + s->legacy_unicast_reflect_slots[idx] = NULL; +} + +static void free_slots(AvahiServer *s) { + unsigned idx; + assert(s); + + if (!s->legacy_unicast_reflect_slots) + return; + + for (idx = 0; idx < AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX; idx ++) + if (s->legacy_unicast_reflect_slots[idx]) + deallocate_slot(s, s->legacy_unicast_reflect_slots[idx]); + + avahi_free(s->legacy_unicast_reflect_slots); + s->legacy_unicast_reflect_slots = NULL; +} + +static AvahiLegacyUnicastReflectSlot* find_slot(AvahiServer *s, uint16_t id) { + unsigned idx; + + assert(s); + + if (!s->legacy_unicast_reflect_slots) + return NULL; + + idx = id % AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX; + + if (!s->legacy_unicast_reflect_slots[idx] || s->legacy_unicast_reflect_slots[idx]->id != id) + return NULL; + + return s->legacy_unicast_reflect_slots[idx]; +} + +static void legacy_unicast_reflect_slot_timeout(AvahiTimeEvent *e, void *userdata) { + AvahiLegacyUnicastReflectSlot *slot = userdata; + + assert(e); + assert(slot); + assert(slot->time_event == e); + + deallocate_slot(slot->server, slot); +} + +static void reflect_legacy_unicast_query_packet(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, uint16_t port) { + AvahiLegacyUnicastReflectSlot *slot; + AvahiInterface *j; + + assert(s); + assert(p); + assert(i); + assert(a); + assert(port > 0); + assert(i->protocol == a->proto); + + if (!s->config.enable_reflector) + return; + + /* Reflecting legacy unicast queries is a little more complicated + than reflecting normal queries, since we must route the + responses back to the right client. Therefore we must store + some information for finding the right client contact data for + response packets. In contrast to normal queries legacy + unicast query and response packets are reflected untouched and + are not reassembled into larger packets */ + + if (!(slot = allocate_slot(s))) { + /* No slot available, we drop this legacy unicast query */ + avahi_log_warn("No slot available for legacy unicast reflection, dropping query packet."); + return; + } + + slot->original_id = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ID); + slot->address = *a; + slot->port = port; + slot->interface = i->hardware->index; + + avahi_elapse_time(&slot->elapse_time, 2000, 0); + slot->time_event = avahi_time_event_new(s->time_event_queue, &slot->elapse_time, legacy_unicast_reflect_slot_timeout, slot); + + /* Patch the packet with our new locally generatet id */ + avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->id); + + for (j = s->monitor->interfaces; j; j = j->interface_next) + if (j->announcing && + j != i && + (s->config.reflect_ipv || j->protocol == i->protocol)) { + + if (j->protocol == AVAHI_PROTO_INET && s->fd_legacy_unicast_ipv4 >= 0) { + avahi_send_dns_packet_ipv4(s->fd_legacy_unicast_ipv4, j->hardware->index, p, NULL, NULL, 0); + } else if (j->protocol == AVAHI_PROTO_INET6 && s->fd_legacy_unicast_ipv6 >= 0) + avahi_send_dns_packet_ipv6(s->fd_legacy_unicast_ipv6, j->hardware->index, p, NULL, NULL, 0); + } + + /* Reset the id */ + avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->original_id); +} + +static int originates_from_local_legacy_unicast_socket(AvahiServer *s, const AvahiAddress *address, uint16_t port) { + assert(s); + assert(address); + assert(port > 0); + + if (!s->config.enable_reflector) + return 0; + + if (!avahi_address_is_local(s->monitor, address)) + return 0; + + if (address->proto == AVAHI_PROTO_INET && s->fd_legacy_unicast_ipv4 >= 0) { + struct sockaddr_in lsa; + socklen_t l = sizeof(lsa); + + if (getsockname(s->fd_legacy_unicast_ipv4, (struct sockaddr*) &lsa, &l) != 0) + avahi_log_warn("getsockname(): %s", strerror(errno)); + else + return avahi_port_from_sockaddr((struct sockaddr*) &lsa) == port; + + } + + if (address->proto == AVAHI_PROTO_INET6 && s->fd_legacy_unicast_ipv6 >= 0) { + struct sockaddr_in6 lsa; + socklen_t l = sizeof(lsa); + + if (getsockname(s->fd_legacy_unicast_ipv6, (struct sockaddr*) &lsa, &l) != 0) + avahi_log_warn("getsockname(): %s", strerror(errno)); + else + return avahi_port_from_sockaddr((struct sockaddr*) &lsa) == port; + } + + return 0; +} + +static int is_mdns_mcast_address(const AvahiAddress *a) { + AvahiAddress b; + assert(a); + + avahi_address_parse(a->proto == AVAHI_PROTO_INET ? AVAHI_IPV4_MCAST_GROUP : AVAHI_IPV6_MCAST_GROUP, a->proto, &b); + return avahi_address_cmp(a, &b) == 0; +} + +static int originates_from_local_iface(AvahiServer *s, AvahiIfIndex iface, const AvahiAddress *a, uint16_t port) { + assert(s); + assert(iface != AVAHI_IF_UNSPEC); + assert(a); + + /* If it isn't the MDNS port it can't be generated by us */ + if (port != AVAHI_MDNS_PORT) + return 0; + + return avahi_interface_has_address(s->monitor, iface, a); +} + +static void dispatch_packet(AvahiServer *s, AvahiDnsPacket *p, const AvahiAddress *src_address, uint16_t port, const AvahiAddress *dst_address, AvahiIfIndex iface, int ttl) { + AvahiInterface *i; + int from_local_iface = 0; + + assert(s); + assert(p); + assert(src_address); + assert(dst_address); + assert(iface > 0); + assert(src_address->proto == dst_address->proto); + + if (!(i = avahi_interface_monitor_get_interface(s->monitor, iface, src_address->proto)) || + !i->announcing) { + avahi_log_warn("Received packet from invalid interface."); + return; + } + + if (port <= 0) { + /* This fixes RHBZ #475394 */ + avahi_log_warn("Received packet from invalid source port %u.", (unsigned) port); + return; + } + + if (avahi_address_is_ipv4_in_ipv6(src_address)) + /* This is an IPv4 address encapsulated in IPv6, so let's ignore it. */ + return; + + if (originates_from_local_legacy_unicast_socket(s, src_address, port)) + /* This originates from our local reflector, so let's ignore it */ + return; + + /* We don't want to reflect local traffic, so we check if this packet is generated locally. */ + if (s->config.enable_reflector) + from_local_iface = originates_from_local_iface(s, iface, src_address, port); + + if (avahi_dns_packet_check_valid_multicast(p) < 0) { + avahi_log_warn("Received invalid packet."); + return; + } + + if (avahi_dns_packet_is_query(p)) { + int legacy_unicast = 0; + + /* For queries EDNS0 might allow ARCOUNT != 0. We ignore the + * AR section completely here, so far. Until the day we add + * EDNS0 support. */ + + if (port != AVAHI_MDNS_PORT) { + /* Legacy Unicast */ + + if ((avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) != 0 || + avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0)) { + avahi_log_warn("Invalid legacy unicast query packet."); + return; + } + + legacy_unicast = 1; + } + + if (legacy_unicast) + reflect_legacy_unicast_query_packet(s, p, i, src_address, port); + + handle_query_packet(s, p, i, src_address, port, legacy_unicast, from_local_iface); + + } else { + char t[AVAHI_ADDRESS_STR_MAX]; + + if (port != AVAHI_MDNS_PORT) { + avahi_log_warn("Received response from host %s with invalid source port %u on interface '%s.%i'", avahi_address_snprint(t, sizeof(t), src_address), port, i->hardware->name, i->protocol); + return; + } + + if (ttl != 255 && s->config.check_response_ttl) { + avahi_log_warn("Received response from host %s with invalid TTL %u on interface '%s.%i'.", avahi_address_snprint(t, sizeof(t), src_address), ttl, i->hardware->name, i->protocol); + return; + } + + if (!is_mdns_mcast_address(dst_address) && + !avahi_interface_address_on_link(i, src_address)) { + + avahi_log_warn("Received non-local response from host %s on interface '%s.%i'.", avahi_address_snprint(t, sizeof(t), src_address), i->hardware->name, i->protocol); + return; + } + + if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT) != 0 || + avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0 || + avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0) { + + avahi_log_warn("Invalid response packet from host %s.", avahi_address_snprint(t, sizeof(t), src_address)); + return; + } + + handle_response_packet(s, p, i, src_address, from_local_iface); + } +} + +static void dispatch_legacy_unicast_packet(AvahiServer *s, AvahiDnsPacket *p) { + AvahiInterface *j; + AvahiLegacyUnicastReflectSlot *slot; + + assert(s); + assert(p); + + if (avahi_dns_packet_check_valid(p) < 0 || avahi_dns_packet_is_query(p)) { + avahi_log_warn("Received invalid packet."); + return; + } + + if (!(slot = find_slot(s, avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ID)))) { + avahi_log_warn("Received legacy unicast response with unknown id"); + return; + } + + if (!(j = avahi_interface_monitor_get_interface(s->monitor, slot->interface, slot->address.proto)) || + !j->announcing) + return; + + /* Patch the original ID into this response */ + avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->original_id); + + /* Forward the response to the correct client */ + avahi_interface_send_packet_unicast(j, p, &slot->address, slot->port); + + /* Undo changes to packet */ + avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->id); +} + +static void mcast_socket_event(AvahiWatch *w, int fd, AvahiWatchEvent events, void *userdata) { + AvahiServer *s = userdata; + AvahiAddress dest, src; + AvahiDnsPacket *p = NULL; + AvahiIfIndex iface; + uint16_t port; + uint8_t ttl; + + assert(w); + assert(fd >= 0); + assert(events & AVAHI_WATCH_IN); + + if (fd == s->fd_ipv4) { + dest.proto = src.proto = AVAHI_PROTO_INET; + p = avahi_recv_dns_packet_ipv4(s->fd_ipv4, &src.data.ipv4, &port, &dest.data.ipv4, &iface, &ttl); + } else { + assert(fd == s->fd_ipv6); + dest.proto = src.proto = AVAHI_PROTO_INET6; + p = avahi_recv_dns_packet_ipv6(s->fd_ipv6, &src.data.ipv6, &port, &dest.data.ipv6, &iface, &ttl); + } + + if (p) { + if (iface == AVAHI_IF_UNSPEC) + iface = avahi_find_interface_for_address(s->monitor, &dest); + + if (iface != AVAHI_IF_UNSPEC) + dispatch_packet(s, p, &src, port, &dest, iface, ttl); + else + avahi_log_error("Incoming packet received on address that isn't local."); + + avahi_dns_packet_free(p); + + avahi_cleanup_dead_entries(s); + } +} + +static void legacy_unicast_socket_event(AvahiWatch *w, int fd, AvahiWatchEvent events, void *userdata) { + AvahiServer *s = userdata; + AvahiDnsPacket *p = NULL; + + assert(w); + assert(fd >= 0); + assert(events & AVAHI_WATCH_IN); + + if (fd == s->fd_legacy_unicast_ipv4) + p = avahi_recv_dns_packet_ipv4(s->fd_legacy_unicast_ipv4, NULL, NULL, NULL, NULL, NULL); + else { + assert(fd == s->fd_legacy_unicast_ipv6); + p = avahi_recv_dns_packet_ipv6(s->fd_legacy_unicast_ipv6, NULL, NULL, NULL, NULL, NULL); + } + + if (p) { + dispatch_legacy_unicast_packet(s, p); + avahi_dns_packet_free(p); + + avahi_cleanup_dead_entries(s); + } +} + +static void server_set_state(AvahiServer *s, AvahiServerState state) { + assert(s); + + if (s->state == state) + return; + + s->state = state; + + avahi_interface_monitor_update_rrs(s->monitor, 0); + + if (s->callback) + s->callback(s, state, s->userdata); +} + +static void withdraw_host_rrs(AvahiServer *s) { + assert(s); + + if (s->hinfo_entry_group) + avahi_s_entry_group_reset(s->hinfo_entry_group); + + if (s->browse_domain_entry_group) + avahi_s_entry_group_reset(s->browse_domain_entry_group); + + avahi_interface_monitor_update_rrs(s->monitor, 1); + s->n_host_rr_pending = 0; +} + +void avahi_server_decrease_host_rr_pending(AvahiServer *s) { + assert(s); + + assert(s->n_host_rr_pending > 0); + + if (--s->n_host_rr_pending == 0) + server_set_state(s, AVAHI_SERVER_RUNNING); +} + +void avahi_host_rr_entry_group_callback(AvahiServer *s, AvahiSEntryGroup *g, AvahiEntryGroupState state, AVAHI_GCC_UNUSED void *userdata) { + assert(s); + assert(g); + + if (state == AVAHI_ENTRY_GROUP_REGISTERING && + s->state == AVAHI_SERVER_REGISTERING) + s->n_host_rr_pending ++; + + else if (state == AVAHI_ENTRY_GROUP_COLLISION && + (s->state == AVAHI_SERVER_REGISTERING || s->state == AVAHI_SERVER_RUNNING)) { + withdraw_host_rrs(s); + server_set_state(s, AVAHI_SERVER_COLLISION); + + } else if (state == AVAHI_ENTRY_GROUP_ESTABLISHED && + s->state == AVAHI_SERVER_REGISTERING) + avahi_server_decrease_host_rr_pending(s); +} + +static void register_hinfo(AvahiServer *s) { + struct utsname utsname; + AvahiRecord *r; + + assert(s); + + if (!s->config.publish_hinfo) + return; + + if (s->hinfo_entry_group) + assert(avahi_s_entry_group_is_empty(s->hinfo_entry_group)); + else + s->hinfo_entry_group = avahi_s_entry_group_new(s, avahi_host_rr_entry_group_callback, NULL); + + if (!s->hinfo_entry_group) { + avahi_log_warn("Failed to create HINFO entry group: %s", avahi_strerror(s->error)); + return; + } + + /* Fill in HINFO rr */ + if ((r = avahi_record_new_full(s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_HINFO, AVAHI_DEFAULT_TTL_HOST_NAME))) { + + if (uname(&utsname) < 0) + avahi_log_warn("uname() failed: %s\n", avahi_strerror(errno)); + else { + + r->data.hinfo.cpu = avahi_strdup(avahi_strup(utsname.machine)); + r->data.hinfo.os = avahi_strdup(avahi_strup(utsname.sysname)); + + avahi_log_info("Registering HINFO record with values '%s'/'%s'.", r->data.hinfo.cpu, r->data.hinfo.os); + + if (avahi_server_add(s, s->hinfo_entry_group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_UNIQUE, r) < 0) { + avahi_log_warn("Failed to add HINFO RR: %s", avahi_strerror(s->error)); + return; + } + } + + avahi_record_unref(r); + } + + if (avahi_s_entry_group_commit(s->hinfo_entry_group) < 0) + avahi_log_warn("Failed to commit HINFO entry group: %s", avahi_strerror(s->error)); + +} + +static void register_localhost(AvahiServer *s) { + AvahiAddress a; + assert(s); + + /* Add localhost entries */ + avahi_address_parse("127.0.0.1", AVAHI_PROTO_INET, &a); + avahi_server_add_address(s, NULL, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_NO_PROBE|AVAHI_PUBLISH_NO_ANNOUNCE, "localhost", &a); + + avahi_address_parse("::1", AVAHI_PROTO_INET6, &a); + avahi_server_add_address(s, NULL, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_NO_PROBE|AVAHI_PUBLISH_NO_ANNOUNCE, "ip6-localhost", &a); +} + +static void register_browse_domain(AvahiServer *s) { + assert(s); + + if (!s->config.publish_domain) + return; + + if (avahi_domain_equal(s->domain_name, "local")) + return; + + if (s->browse_domain_entry_group) + assert(avahi_s_entry_group_is_empty(s->browse_domain_entry_group)); + else + s->browse_domain_entry_group = avahi_s_entry_group_new(s, NULL, NULL); + + if (!s->browse_domain_entry_group) { + avahi_log_warn("Failed to create browse domain entry group: %s", avahi_strerror(s->error)); + return; + } + + if (avahi_server_add_ptr(s, s->browse_domain_entry_group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, AVAHI_DEFAULT_TTL, "b._dns-sd._udp.local", s->domain_name) < 0) { + avahi_log_warn("Failed to add browse domain RR: %s", avahi_strerror(s->error)); + return; + } + + if (avahi_s_entry_group_commit(s->browse_domain_entry_group) < 0) + avahi_log_warn("Failed to commit browse domain entry group: %s", avahi_strerror(s->error)); +} + +static void register_stuff(AvahiServer *s) { + assert(s); + + server_set_state(s, AVAHI_SERVER_REGISTERING); + s->n_host_rr_pending ++; /** Make sure that the state isn't changed tp AVAHI_SERVER_RUNNING too early */ + + register_hinfo(s); + register_browse_domain(s); + avahi_interface_monitor_update_rrs(s->monitor, 0); + + assert(s->n_host_rr_pending > 0); + s->n_host_rr_pending --; + + if (s->n_host_rr_pending == 0) + server_set_state(s, AVAHI_SERVER_RUNNING); +} + +static void update_fqdn(AvahiServer *s) { + char *n; + + assert(s); + assert(s->host_name); + assert(s->domain_name); + + if (!(n = avahi_strdup_printf("%s.%s", s->host_name, s->domain_name))) + return; /* OOM */ + + avahi_free(s->host_name_fqdn); + s->host_name_fqdn = n; +} + +int avahi_server_set_host_name(AvahiServer *s, const char *host_name) { + char *hn = NULL; + assert(s); + + AVAHI_CHECK_VALIDITY(s, !host_name || avahi_is_valid_host_name(host_name), AVAHI_ERR_INVALID_HOST_NAME); + + if (!host_name) + hn = avahi_get_host_name_strdup(); + else + hn = avahi_normalize_name_strdup(host_name); + + hn[strcspn(hn, ".")] = 0; + + if (avahi_domain_equal(s->host_name, hn) && s->state != AVAHI_SERVER_COLLISION) { + avahi_free(hn); + return avahi_server_set_errno(s, AVAHI_ERR_NO_CHANGE); + } + + withdraw_host_rrs(s); + + avahi_free(s->host_name); + s->host_name = hn; + + update_fqdn(s); + + register_stuff(s); + return AVAHI_OK; +} + +int avahi_server_set_domain_name(AvahiServer *s, const char *domain_name) { + char *dn = NULL; + assert(s); + + AVAHI_CHECK_VALIDITY(s, !domain_name || avahi_is_valid_domain_name(domain_name), AVAHI_ERR_INVALID_DOMAIN_NAME); + + if (!domain_name) + dn = avahi_strdup("local"); + else + dn = avahi_normalize_name_strdup(domain_name); + + if (avahi_domain_equal(s->domain_name, domain_name)) { + avahi_free(dn); + return avahi_server_set_errno(s, AVAHI_ERR_NO_CHANGE); + } + + withdraw_host_rrs(s); + + avahi_free(s->domain_name); + s->domain_name = dn; + update_fqdn(s); + + register_stuff(s); + + avahi_free(dn); + return AVAHI_OK; +} + +static int valid_server_config(const AvahiServerConfig *sc) { + AvahiStringList *l; + + assert(sc); + + if (sc->n_wide_area_servers > AVAHI_WIDE_AREA_SERVERS_MAX) + return AVAHI_ERR_INVALID_CONFIG; + + if (sc->host_name && !avahi_is_valid_host_name(sc->host_name)) + return AVAHI_ERR_INVALID_HOST_NAME; + + if (sc->domain_name && !avahi_is_valid_domain_name(sc->domain_name)) + return AVAHI_ERR_INVALID_DOMAIN_NAME; + + for (l = sc->browse_domains; l; l = l->next) + if (!avahi_is_valid_domain_name((char*) l->text)) + return AVAHI_ERR_INVALID_DOMAIN_NAME; + + return AVAHI_OK; +} + +static int setup_sockets(AvahiServer *s) { + assert(s); + + s->fd_ipv4 = s->config.use_ipv4 ? avahi_open_socket_ipv4(s->config.disallow_other_stacks) : -1; + s->fd_ipv6 = s->config.use_ipv6 ? avahi_open_socket_ipv6(s->config.disallow_other_stacks) : -1; + + if (s->fd_ipv6 < 0 && s->fd_ipv4 < 0) + return AVAHI_ERR_NO_NETWORK; + + if (s->fd_ipv4 < 0 && s->config.use_ipv4) + avahi_log_notice("Failed to create IPv4 socket, proceeding in IPv6 only mode"); + else if (s->fd_ipv6 < 0 && s->config.use_ipv6) + avahi_log_notice("Failed to create IPv6 socket, proceeding in IPv4 only mode"); + + s->fd_legacy_unicast_ipv4 = s->fd_ipv4 >= 0 && s->config.enable_reflector ? avahi_open_unicast_socket_ipv4() : -1; + s->fd_legacy_unicast_ipv6 = s->fd_ipv6 >= 0 && s->config.enable_reflector ? avahi_open_unicast_socket_ipv6() : -1; + + s->watch_ipv4 = + s->watch_ipv6 = + s->watch_legacy_unicast_ipv4 = + s->watch_legacy_unicast_ipv6 = NULL; + + if (s->fd_ipv4 >= 0) + s->watch_ipv4 = s->poll_api->watch_new(s->poll_api, s->fd_ipv4, AVAHI_WATCH_IN, mcast_socket_event, s); + if (s->fd_ipv6 >= 0) + s->watch_ipv6 = s->poll_api->watch_new(s->poll_api, s->fd_ipv6, AVAHI_WATCH_IN, mcast_socket_event, s); + + if (s->fd_legacy_unicast_ipv4 >= 0) + s->watch_legacy_unicast_ipv4 = s->poll_api->watch_new(s->poll_api, s->fd_legacy_unicast_ipv4, AVAHI_WATCH_IN, legacy_unicast_socket_event, s); + if (s->fd_legacy_unicast_ipv6 >= 0) + s->watch_legacy_unicast_ipv6 = s->poll_api->watch_new(s->poll_api, s->fd_legacy_unicast_ipv6, AVAHI_WATCH_IN, legacy_unicast_socket_event, s); + + return 0; +} + +AvahiServer *avahi_server_new(const AvahiPoll *poll_api, const AvahiServerConfig *sc, AvahiServerCallback callback, void* userdata, int *error) { + AvahiServer *s; + int e; + + if (sc && (e = valid_server_config(sc)) < 0) { + if (error) + *error = e; + return NULL; + } + + if (!(s = avahi_new(AvahiServer, 1))) { + if (error) + *error = AVAHI_ERR_NO_MEMORY; + + return NULL; + } + + s->poll_api = poll_api; + + if (sc) + avahi_server_config_copy(&s->config, sc); + else + avahi_server_config_init(&s->config); + + if ((e = setup_sockets(s)) < 0) { + if (error) + *error = e; + + avahi_server_config_free(&s->config); + avahi_free(s); + + return NULL; + } + + s->n_host_rr_pending = 0; + s->need_entry_cleanup = 0; + s->need_group_cleanup = 0; + s->need_browser_cleanup = 0; + s->cleanup_time_event = NULL; + s->hinfo_entry_group = NULL; + s->browse_domain_entry_group = NULL; + s->error = AVAHI_OK; + s->state = AVAHI_SERVER_INVALID; + + s->callback = callback; + s->userdata = userdata; + + s->time_event_queue = avahi_time_event_queue_new(poll_api); + + s->entries_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL); + AVAHI_LLIST_HEAD_INIT(AvahiEntry, s->entries); + AVAHI_LLIST_HEAD_INIT(AvahiGroup, s->groups); + + s->record_browser_hashmap = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL); + AVAHI_LLIST_HEAD_INIT(AvahiSRecordBrowser, s->record_browsers); + AVAHI_LLIST_HEAD_INIT(AvahiSHostNameResolver, s->host_name_resolvers); + AVAHI_LLIST_HEAD_INIT(AvahiSAddressResolver, s->address_resolvers); + AVAHI_LLIST_HEAD_INIT(AvahiSDomainBrowser, s->domain_browsers); + AVAHI_LLIST_HEAD_INIT(AvahiSServiceTypeBrowser, s->service_type_browsers); + AVAHI_LLIST_HEAD_INIT(AvahiSServiceBrowser, s->service_browsers); + AVAHI_LLIST_HEAD_INIT(AvahiSServiceResolver, s->service_resolvers); + AVAHI_LLIST_HEAD_INIT(AvahiSDNSServerBrowser, s->dns_server_browsers); + + s->legacy_unicast_reflect_slots = NULL; + s->legacy_unicast_reflect_id = 0; + + s->record_list = avahi_record_list_new(); + + /* Get host name */ + s->host_name = s->config.host_name ? avahi_normalize_name_strdup(s->config.host_name) : avahi_get_host_name_strdup(); + s->host_name[strcspn(s->host_name, ".")] = 0; + s->domain_name = s->config.domain_name ? avahi_normalize_name_strdup(s->config.domain_name) : avahi_strdup("local"); + s->host_name_fqdn = NULL; + update_fqdn(s); + + do { + s->local_service_cookie = (uint32_t) rand() * (uint32_t) rand(); + } while (s->local_service_cookie == AVAHI_SERVICE_COOKIE_INVALID); + + if (s->config.enable_wide_area) { + s->wide_area_lookup_engine = avahi_wide_area_engine_new(s); + avahi_wide_area_set_servers(s->wide_area_lookup_engine, s->config.wide_area_servers, s->config.n_wide_area_servers); + } else + s->wide_area_lookup_engine = NULL; + + s->multicast_lookup_engine = avahi_multicast_lookup_engine_new(s); + + s->monitor = avahi_interface_monitor_new(s); + avahi_interface_monitor_sync(s->monitor); + + register_localhost(s); + register_stuff(s); + + return s; +} + +void avahi_server_free(AvahiServer* s) { + assert(s); + + /* Remove all browsers */ + + while (s->dns_server_browsers) + avahi_s_dns_server_browser_free(s->dns_server_browsers); + while (s->host_name_resolvers) + avahi_s_host_name_resolver_free(s->host_name_resolvers); + while (s->address_resolvers) + avahi_s_address_resolver_free(s->address_resolvers); + while (s->domain_browsers) + avahi_s_domain_browser_free(s->domain_browsers); + while (s->service_type_browsers) + avahi_s_service_type_browser_free(s->service_type_browsers); + while (s->service_browsers) + avahi_s_service_browser_free(s->service_browsers); + while (s->service_resolvers) + avahi_s_service_resolver_free(s->service_resolvers); + while (s->record_browsers) + avahi_s_record_browser_destroy(s->record_browsers); + + /* Remove all locally rgeistered stuff */ + + while(s->entries) + avahi_entry_free(s, s->entries); + + avahi_interface_monitor_free(s->monitor); + + while (s->groups) + avahi_entry_group_free(s, s->groups); + + free_slots(s); + + avahi_hashmap_free(s->entries_by_key); + avahi_record_list_free(s->record_list); + avahi_hashmap_free(s->record_browser_hashmap); + + if (s->wide_area_lookup_engine) + avahi_wide_area_engine_free(s->wide_area_lookup_engine); + avahi_multicast_lookup_engine_free(s->multicast_lookup_engine); + + if (s->cleanup_time_event) + avahi_time_event_free(s->cleanup_time_event); + + avahi_time_event_queue_free(s->time_event_queue); + + /* Free watches */ + + if (s->watch_ipv4) + s->poll_api->watch_free(s->watch_ipv4); + if (s->watch_ipv6) + s->poll_api->watch_free(s->watch_ipv6); + + if (s->watch_legacy_unicast_ipv4) + s->poll_api->watch_free(s->watch_legacy_unicast_ipv4); + if (s->watch_legacy_unicast_ipv6) + s->poll_api->watch_free(s->watch_legacy_unicast_ipv6); + + /* Free sockets */ + + if (s->fd_ipv4 >= 0) + close(s->fd_ipv4); + if (s->fd_ipv6 >= 0) + close(s->fd_ipv6); + + if (s->fd_legacy_unicast_ipv4 >= 0) + close(s->fd_legacy_unicast_ipv4); + if (s->fd_legacy_unicast_ipv6 >= 0) + close(s->fd_legacy_unicast_ipv6); + + /* Free other stuff */ + + avahi_free(s->host_name); + avahi_free(s->domain_name); + avahi_free(s->host_name_fqdn); + + avahi_server_config_free(&s->config); + + avahi_free(s); +} + +const char* avahi_server_get_domain_name(AvahiServer *s) { + assert(s); + + return s->domain_name; +} + +const char* avahi_server_get_host_name(AvahiServer *s) { + assert(s); + + return s->host_name; +} + +const char* avahi_server_get_host_name_fqdn(AvahiServer *s) { + assert(s); + + return s->host_name_fqdn; +} + +void* avahi_server_get_data(AvahiServer *s) { + assert(s); + + return s->userdata; +} + +void avahi_server_set_data(AvahiServer *s, void* userdata) { + assert(s); + + s->userdata = userdata; +} + +AvahiServerState avahi_server_get_state(AvahiServer *s) { + assert(s); + + return s->state; +} + +AvahiServerConfig* avahi_server_config_init(AvahiServerConfig *c) { + assert(c); + + memset(c, 0, sizeof(AvahiServerConfig)); + c->use_ipv6 = 1; + c->use_ipv4 = 1; + c->allow_interfaces = NULL; + c->deny_interfaces = NULL; + c->host_name = NULL; + c->domain_name = NULL; + c->check_response_ttl = 0; + c->publish_hinfo = 0; + c->publish_addresses = 1; + c->publish_no_reverse = 0; + c->publish_workstation = 0; + c->publish_domain = 1; + c->use_iff_running = 0; + c->enable_reflector = 0; + c->reflect_ipv = 0; + c->add_service_cookie = 0; + c->enable_wide_area = 0; + c->n_wide_area_servers = 0; + c->disallow_other_stacks = 0; + c->browse_domains = NULL; + c->disable_publishing = 0; + c->allow_point_to_point = 0; + c->publish_aaaa_on_ipv4 = 1; + c->publish_a_on_ipv6 = 0; + c->n_cache_entries_max = AVAHI_DEFAULT_CACHE_ENTRIES_MAX; + c->ratelimit_interval = 0; + c->ratelimit_burst = 0; + + return c; +} + +void avahi_server_config_free(AvahiServerConfig *c) { + assert(c); + + avahi_free(c->host_name); + avahi_free(c->domain_name); + avahi_string_list_free(c->browse_domains); + avahi_string_list_free(c->allow_interfaces); + avahi_string_list_free(c->deny_interfaces); +} + +AvahiServerConfig* avahi_server_config_copy(AvahiServerConfig *ret, const AvahiServerConfig *c) { + char *d = NULL, *h = NULL; + AvahiStringList *browse = NULL, *allow = NULL, *deny = NULL; + assert(ret); + assert(c); + + if (c->host_name) + if (!(h = avahi_strdup(c->host_name))) + return NULL; + + if (c->domain_name) + if (!(d = avahi_strdup(c->domain_name))) { + avahi_free(h); + return NULL; + } + + if (!(browse = avahi_string_list_copy(c->browse_domains)) && c->browse_domains) { + avahi_free(h); + avahi_free(d); + return NULL; + } + + if (!(allow = avahi_string_list_copy(c->allow_interfaces)) && c->allow_interfaces) { + avahi_string_list_free(browse); + avahi_free(h); + avahi_free(d); + return NULL; + } + + if (!(deny = avahi_string_list_copy(c->deny_interfaces)) && c->deny_interfaces) { + avahi_string_list_free(allow); + avahi_string_list_free(browse); + avahi_free(h); + avahi_free(d); + return NULL; + } + + *ret = *c; + ret->host_name = h; + ret->domain_name = d; + ret->browse_domains = browse; + ret->allow_interfaces = allow; + ret->deny_interfaces = deny; + + return ret; +} + +int avahi_server_errno(AvahiServer *s) { + assert(s); + + return s->error; +} + +/* Just for internal use */ +int avahi_server_set_errno(AvahiServer *s, int error) { + assert(s); + + return s->error = error; +} + +uint32_t avahi_server_get_local_service_cookie(AvahiServer *s) { + assert(s); + + return s->local_service_cookie; +} + +static AvahiEntry *find_entry(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, AvahiKey *key) { + AvahiEntry *e; + + assert(s); + assert(key); + + for (e = avahi_hashmap_lookup(s->entries_by_key, key); e; e = e->by_key_next) + + if ((e->interface == interface || e->interface <= 0 || interface <= 0) && + (e->protocol == protocol || e->protocol == AVAHI_PROTO_UNSPEC || protocol == AVAHI_PROTO_UNSPEC) && + (!e->group || e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED || e->group->state == AVAHI_ENTRY_GROUP_REGISTERING)) + + return e; + + return NULL; +} + +int avahi_server_get_group_of_service(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, const char *name, const char *type, const char *domain, AvahiSEntryGroup** ret_group) { + AvahiKey *key = NULL; + AvahiEntry *e; + int ret; + char n[AVAHI_DOMAIN_NAME_MAX]; + + assert(s); + assert(name); + assert(type); + assert(ret_group); + + AVAHI_CHECK_VALIDITY(s, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE); + AVAHI_CHECK_VALIDITY(s, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL); + AVAHI_CHECK_VALIDITY(s, avahi_is_valid_service_name(name), AVAHI_ERR_INVALID_SERVICE_NAME); + AVAHI_CHECK_VALIDITY(s, avahi_is_valid_service_type_strict(type), AVAHI_ERR_INVALID_SERVICE_TYPE); + AVAHI_CHECK_VALIDITY(s, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME); + + if ((ret = avahi_service_name_join(n, sizeof(n), name, type, domain) < 0)) + return avahi_server_set_errno(s, ret); + + if (!(key = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV))) + return avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + + e = find_entry(s, interface, protocol, key); + avahi_key_unref(key); + + if (e) { + *ret_group = e->group; + return AVAHI_OK; + } + + return avahi_server_set_errno(s, AVAHI_ERR_NOT_FOUND); +} + +int avahi_server_is_service_local(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, const char *name) { + AvahiKey *key = NULL; + AvahiEntry *e; + + assert(s); + assert(name); + + if (!s->host_name_fqdn) + return 0; + + if (!(key = avahi_key_new(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV))) + return 0; + + e = find_entry(s, interface, protocol, key); + avahi_key_unref(key); + + if (!e) + return 0; + + return avahi_domain_equal(s->host_name_fqdn, e->record->data.srv.name); +} + +int avahi_server_is_record_local(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, AvahiRecord *record) { + AvahiEntry *e; + + assert(s); + assert(record); + + for (e = avahi_hashmap_lookup(s->entries_by_key, record->key); e; e = e->by_key_next) + + if ((e->interface == interface || e->interface <= 0 || interface <= 0) && + (e->protocol == protocol || e->protocol == AVAHI_PROTO_UNSPEC || protocol == AVAHI_PROTO_UNSPEC) && + (!e->group || e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED || e->group->state == AVAHI_ENTRY_GROUP_REGISTERING) && + avahi_record_equal_no_ttl(record, e->record)) + return 1; + + return 0; +} + +/** Set the wide area DNS servers */ +int avahi_server_set_wide_area_servers(AvahiServer *s, const AvahiAddress *a, unsigned n) { + assert(s); + + if (!s->wide_area_lookup_engine) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_CONFIG); + + avahi_wide_area_set_servers(s->wide_area_lookup_engine, a, n); + return AVAHI_OK; +} + +const AvahiServerConfig* avahi_server_get_config(AvahiServer *s) { + assert(s); + + return &s->config; +} + +/** Set the browsing domains */ +int avahi_server_set_browse_domains(AvahiServer *s, AvahiStringList *domains) { + AvahiStringList *l; + + assert(s); + + for (l = s->config.browse_domains; l; l = l->next) + if (!avahi_is_valid_domain_name((char*) l->text)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_DOMAIN_NAME); + + avahi_string_list_free(s->config.browse_domains); + s->config.browse_domains = avahi_string_list_copy(domains); + + return AVAHI_OK; +}