diff options
Diffstat (limited to 'avahi-core/entry.c')
-rw-r--r-- | avahi-core/entry.c | 1201 |
1 files changed, 1201 insertions, 0 deletions
diff --git a/avahi-core/entry.c b/avahi-core/entry.c new file mode 100644 index 0000000..be215dd --- /dev/null +++ b/avahi-core/entry.c @@ -0,0 +1,1201 @@ +/* $Id$ */ + +/*** + 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 <sys/socket.h> +#include <arpa/inet.h> +#include <string.h> +#include <sys/utsname.h> +#include <unistd.h> +#include <errno.h> +#include <stdio.h> +#include <assert.h> +#include <stdlib.h> + +#include <avahi-common/domain.h> +#include <avahi-common/timeval.h> +#include <avahi-common/malloc.h> +#include <avahi-common/error.h> + +#include "server.h" +#include "iface.h" +#include "socket.h" +#include "browse.h" +#include "log.h" +#include "util.h" + +void avahi_entry_free(AvahiServer*s, AvahiEntry *e) { + AvahiEntry *t; + + assert(s); + assert(e); + + avahi_goodbye_entry(s, e, 1, 1); + + /* Remove from linked list */ + AVAHI_LLIST_REMOVE(AvahiEntry, entries, s->entries, e); + + /* Remove from hash table indexed by name */ + t = avahi_hashmap_lookup(s->entries_by_key, e->record->key); + AVAHI_LLIST_REMOVE(AvahiEntry, by_key, t, e); + if (t) + avahi_hashmap_replace(s->entries_by_key, t->record->key, t); + else + avahi_hashmap_remove(s->entries_by_key, e->record->key); + + /* Remove from associated group */ + if (e->group) + AVAHI_LLIST_REMOVE(AvahiEntry, by_group, e->group->entries, e); + + avahi_record_unref(e->record); + avahi_free(e); +} + +void avahi_entry_group_free(AvahiServer *s, AvahiSEntryGroup *g) { + assert(s); + assert(g); + + while (g->entries) + avahi_entry_free(s, g->entries); + + if (g->register_time_event) + avahi_time_event_free(g->register_time_event); + + AVAHI_LLIST_REMOVE(AvahiSEntryGroup, groups, s->groups, g); + avahi_free(g); +} + +void avahi_cleanup_dead_entries(AvahiServer *s) { + assert(s); + + if (s->need_group_cleanup) { + AvahiSEntryGroup *g, *next; + + for (g = s->groups; g; g = next) { + next = g->groups_next; + + if (g->dead) + avahi_entry_group_free(s, g); + } + + s->need_group_cleanup = 0; + } + + if (s->need_entry_cleanup) { + AvahiEntry *e, *next; + + for (e = s->entries; e; e = next) { + next = e->entries_next; + + if (e->dead) + avahi_entry_free(s, e); + } + + s->need_entry_cleanup = 0; + } + + if (s->need_browser_cleanup) + avahi_browser_cleanup(s); +} + +static int check_record_conflict(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, AvahiRecord *r, AvahiPublishFlags flags) { + AvahiEntry *e; + + assert(s); + assert(r); + + for (e = avahi_hashmap_lookup(s->entries_by_key, r->key); e; e = e->by_key_next) { + if (e->dead) + continue; + + if (!(flags & AVAHI_PUBLISH_UNIQUE) && !(e->flags & AVAHI_PUBLISH_UNIQUE)) + continue; + + if ((flags & AVAHI_PUBLISH_ALLOW_MULTIPLE) && (e->flags & AVAHI_PUBLISH_ALLOW_MULTIPLE) ) + continue; + + if ((interface <= 0 || + e->interface <= 0 || + e->interface == interface) && + (protocol == AVAHI_PROTO_UNSPEC || + e->protocol == AVAHI_PROTO_UNSPEC || + e->protocol == protocol)) + + return -1; + } + + return 0; +} + +int avahi_server_add( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + AvahiRecord *r) { + + assert(s); + assert(r); + + if (!AVAHI_IF_VALID(interface)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_INTERFACE); + + if (!AVAHI_PROTO_VALID(protocol)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_PROTOCOL); + + if (!AVAHI_FLAGS_VALID( + flags, + AVAHI_PUBLISH_NO_ANNOUNCE| + AVAHI_PUBLISH_NO_PROBE| + AVAHI_PUBLISH_UNIQUE| + AVAHI_PUBLISH_ALLOW_MULTIPLE| + AVAHI_PUBLISH_IS_PROXY| + AVAHI_PUBLISH_UPDATE)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_FLAGS); + + if (!avahi_is_valid_domain_name(r->key->name)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_HOST_NAME); + + if (r->ttl == 0) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_TTL); + + if (avahi_key_is_pattern(r->key)) + return avahi_server_set_errno(s, AVAHI_ERR_IS_PATTERN); + + if (!avahi_record_is_valid(r)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_RECORD); + + if (flags & AVAHI_PUBLISH_UPDATE) { + AvahiEntry *e; + AvahiRecord *old_record; + int is_first = 1; + + /* Update and existing record */ + + /* Find the first matching entry */ + for (e = avahi_hashmap_lookup(s->entries_by_key, r->key); e; e = e->by_key_next) { + if (!e->dead && e->group == g && e->interface == interface && e->protocol == protocol) + break; + + is_first = 0; + } + + /* Hmm, nothing found? */ + if (!e) + return avahi_server_set_errno(s, AVAHI_ERR_NOT_FOUND); + + /* Update the entry */ + old_record = e->record; + e->record = avahi_record_ref(r); + e->flags = flags; + + /* Announce our changes when needed */ + if (!avahi_record_equal_no_ttl(old_record, r) && (!g || g->state != AVAHI_ENTRY_GROUP_UNCOMMITED)) { + + /* Remove the old entry from all caches, if needed */ + if (!(e->flags & AVAHI_PUBLISH_UNIQUE)) + avahi_goodbye_entry(s, e, 1, 0); + + /* Reannounce our updated entry */ + avahi_reannounce_entry(s, e); + } + + /* If we were the first entry in the list, we need to update the key */ + if (is_first) + avahi_hashmap_replace(s->entries_by_key, e->record->key, e); + + avahi_record_unref(old_record); + + } else { + AvahiEntry *e, *t; + + /* Add a new record */ + + if (check_record_conflict(s, interface, protocol, r, flags) < 0) + return avahi_server_set_errno(s, AVAHI_ERR_LOCAL_COLLISION); + + if (!(e = avahi_new(AvahiEntry, 1))) + return avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + + e->server = s; + e->record = avahi_record_ref(r); + e->group = g; + e->interface = interface; + e->protocol = protocol; + e->flags = flags; + e->dead = 0; + + AVAHI_LLIST_HEAD_INIT(AvahiAnnouncer, e->announcers); + + AVAHI_LLIST_PREPEND(AvahiEntry, entries, s->entries, e); + + /* Insert into hash table indexed by name */ + t = avahi_hashmap_lookup(s->entries_by_key, e->record->key); + AVAHI_LLIST_PREPEND(AvahiEntry, by_key, t, e); + avahi_hashmap_replace(s->entries_by_key, e->record->key, t); + + /* Insert into group list */ + if (g) + AVAHI_LLIST_PREPEND(AvahiEntry, by_group, g->entries, e); + + avahi_announce_entry(s, e); + } + + return AVAHI_OK; +} + +const AvahiRecord *avahi_server_iterate(AvahiServer *s, AvahiSEntryGroup *g, void **state) { + AvahiEntry **e = (AvahiEntry**) state; + assert(s); + assert(e); + + if (!*e) + *e = g ? g->entries : s->entries; + + while (*e && (*e)->dead) + *e = g ? (*e)->by_group_next : (*e)->entries_next; + + if (!*e) + return NULL; + + return avahi_record_ref((*e)->record); +} + +int avahi_server_dump(AvahiServer *s, AvahiDumpCallback callback, void* userdata) { + AvahiEntry *e; + + assert(s); + assert(callback); + + callback(";;; ZONE DUMP FOLLOWS ;;;", userdata); + + for (e = s->entries; e; e = e->entries_next) { + char *t; + char ln[256]; + + if (e->dead) + continue; + + if (!(t = avahi_record_to_string(e->record))) + return avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + + snprintf(ln, sizeof(ln), "%s ; iface=%i proto=%i", t, e->interface, e->protocol); + avahi_free(t); + + callback(ln, userdata); + } + + avahi_dump_caches(s->monitor, callback, userdata); + + if (s->wide_area_lookup_engine) + avahi_wide_area_cache_dump(s->wide_area_lookup_engine, callback, userdata); + return AVAHI_OK; +} + +int avahi_server_add_ptr( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + uint32_t ttl, + const char *name, + const char *dest) { + + AvahiRecord *r; + int ret; + + assert(s); + assert(dest); + + if ((name && !avahi_is_valid_domain_name(name)) || !avahi_is_valid_domain_name(dest)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_HOST_NAME); + + if (!name) + name = s->host_name_fqdn; + + if (!(r = avahi_record_new_full(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR, ttl))) + return avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + + r->data.ptr.name = avahi_normalize_name_strdup(dest); + ret = avahi_server_add(s, g, interface, protocol, flags, r); + avahi_record_unref(r); + return ret; +} + +int avahi_server_add_address( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + const char *name, + AvahiAddress *a) { + + char *n = NULL; + int ret = AVAHI_OK; + + assert(s); + assert(a); + + if (!AVAHI_IF_VALID(interface)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_INTERFACE); + + if (!AVAHI_PROTO_VALID(protocol) || !AVAHI_PROTO_VALID(a->proto)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_PROTOCOL); + + if (!AVAHI_FLAGS_VALID(flags, AVAHI_PUBLISH_NO_REVERSE|AVAHI_PUBLISH_NO_ANNOUNCE|AVAHI_PUBLISH_NO_PROBE|AVAHI_PUBLISH_UPDATE)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_FLAGS); + + if (name && !avahi_is_valid_domain_name(name)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_HOST_NAME); + + if (!name) + name = s->host_name_fqdn; + else { + if (!(n = avahi_normalize_name_strdup(name))) + return avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + + name = n; + } + + if (a->proto == AVAHI_PROTO_INET) { + AvahiRecord *r; + + if (!(r = avahi_record_new_full(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A, AVAHI_DEFAULT_TTL_HOST_NAME))) { + ret = avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + goto fail; + } + + r->data.a.address = a->data.ipv4; + ret = avahi_server_add(s, g, interface, protocol, (flags & ~ AVAHI_PUBLISH_NO_REVERSE) | AVAHI_PUBLISH_UNIQUE | AVAHI_PUBLISH_ALLOW_MULTIPLE, r); + avahi_record_unref(r); + + if (ret < 0) + goto fail; + + if (!(flags & AVAHI_PUBLISH_NO_REVERSE)) { + char *reverse; + + if (!(reverse = avahi_reverse_lookup_name_ipv4(&a->data.ipv4))) { + ret = avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + goto fail; + } + + ret = avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_PUBLISH_UNIQUE, AVAHI_DEFAULT_TTL_HOST_NAME, reverse, name); + avahi_free(reverse); + } + + } else { + AvahiRecord *r; + + assert(a->proto == AVAHI_PROTO_INET6); + + if (!(r = avahi_record_new_full(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA, AVAHI_DEFAULT_TTL_HOST_NAME))) { + ret = avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + goto fail; + } + + r->data.aaaa.address = a->data.ipv6; + ret = avahi_server_add(s, g, interface, protocol, (flags & ~ AVAHI_PUBLISH_NO_REVERSE) | AVAHI_PUBLISH_UNIQUE | AVAHI_PUBLISH_ALLOW_MULTIPLE, r); + avahi_record_unref(r); + + if (ret < 0) + goto fail; + + if (!(flags & AVAHI_PUBLISH_NO_REVERSE)) { + char *reverse; + + if (!(reverse = avahi_reverse_lookup_name_ipv6_arpa(&a->data.ipv6))) { + ret = avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + goto fail; + } + + ret = avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_PUBLISH_UNIQUE, AVAHI_DEFAULT_TTL_HOST_NAME, reverse, name); + avahi_free(reverse); + + if (ret < 0) + goto fail; + + if (!(reverse = avahi_reverse_lookup_name_ipv6_int(&a->data.ipv6))) { + ret = avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + goto fail; + } + + ret = avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_PUBLISH_UNIQUE, AVAHI_DEFAULT_TTL_HOST_NAME, reverse, name); + avahi_free(reverse); + } + } + +fail: + + avahi_free(n); + + return ret; +} + +static int server_add_txt_strlst_nocopy( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + uint32_t ttl, + const char *name, + AvahiStringList *strlst) { + + AvahiRecord *r; + int ret; + + assert(s); + + if (!(r = avahi_record_new_full(name ? name : s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT, ttl))) { + avahi_string_list_free(strlst); + return avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + } + + r->data.txt.string_list = strlst; + ret = avahi_server_add(s, g, interface, protocol, flags, r); + avahi_record_unref(r); + + return ret; +} + +int avahi_server_add_txt_strlst( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + uint32_t ttl, + const char *name, + AvahiStringList *strlst) { + + assert(s); + + return server_add_txt_strlst_nocopy(s, g, interface, protocol, flags, ttl, name, avahi_string_list_copy(strlst)); +} + +int avahi_server_add_txt_va( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + uint32_t ttl, + const char *name, + va_list va) { + + assert(s); + + return server_add_txt_strlst_nocopy(s, g, interface, protocol, flags, ttl, name, avahi_string_list_new_va(va)); +} + +int avahi_server_add_txt( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + uint32_t ttl, + const char *name, + ...) { + + va_list va; + int ret; + + assert(s); + + va_start(va, name); + ret = avahi_server_add_txt_va(s, g, interface, protocol, flags, ttl, name, va); + va_end(va); + + return ret; +} + +static AvahiStringList *add_magic_cookie( + AvahiServer *s, + AvahiStringList *strlst) { + + assert(s); + + if (!s->config.add_service_cookie) + return strlst; + + if (avahi_string_list_find(strlst, AVAHI_SERVICE_COOKIE)) + /* This string list already contains a magic cookie */ + return strlst; + + return avahi_string_list_add_printf(strlst, AVAHI_SERVICE_COOKIE"=%u", s->local_service_cookie); +} + +static int server_add_service_strlst_nocopy( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + const char *name, + const char *type, + const char *domain, + const char *host, + uint16_t port, + AvahiStringList *strlst) { + + char ptr_name[AVAHI_DOMAIN_NAME_MAX], svc_name[AVAHI_DOMAIN_NAME_MAX], enum_ptr[AVAHI_DOMAIN_NAME_MAX], *h = NULL; + AvahiRecord *r = NULL; + int ret = AVAHI_OK; + + assert(s); + assert(type); + assert(name); + + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, AVAHI_FLAGS_VALID(flags, AVAHI_PUBLISH_NO_COOKIE|AVAHI_PUBLISH_IS_PROXY|AVAHI_PUBLISH_UPDATE), AVAHI_ERR_INVALID_FLAGS); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, avahi_is_valid_service_name(name), AVAHI_ERR_INVALID_SERVICE_NAME); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, avahi_is_valid_service_type_strict(type), AVAHI_ERR_INVALID_SERVICE_TYPE); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, !host || avahi_is_valid_domain_name(host), AVAHI_ERR_INVALID_HOST_NAME); + + if (!domain) + domain = s->domain_name; + + if (!host) + host = s->host_name_fqdn; + + if (!(h = avahi_normalize_name_strdup(host))) { + ret = avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + goto fail; + } + + if ((ret = avahi_service_name_join(svc_name, sizeof(svc_name), name, type, domain)) < 0 || + (ret = avahi_service_name_join(ptr_name, sizeof(ptr_name), NULL, type, domain)) < 0 || + (ret = avahi_service_name_join(enum_ptr, sizeof(enum_ptr), NULL, "_services._dns-sd._udp", domain)) < 0) { + avahi_server_set_errno(s, ret); + goto fail; + } + + /* Add service enumeration PTR record */ + + if ((ret = avahi_server_add_ptr(s, g, interface, protocol, flags & AVAHI_PUBLISH_IS_PROXY, AVAHI_DEFAULT_TTL, ptr_name, svc_name)) < 0) + goto fail; + + /* Add SRV record */ + + if (!(r = avahi_record_new_full(svc_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV, AVAHI_DEFAULT_TTL_HOST_NAME))) { + ret = avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + goto fail; + } + + r->data.srv.priority = 0; + r->data.srv.weight = 0; + r->data.srv.port = port; + r->data.srv.name = h; + h = NULL; + ret = avahi_server_add(s, g, interface, protocol, (flags & AVAHI_PUBLISH_IS_PROXY) | AVAHI_PUBLISH_UNIQUE, r); + avahi_record_unref(r); + + if (ret < 0) + goto fail; + + /* Add TXT record */ + + if (!(flags & AVAHI_PUBLISH_NO_COOKIE)) + strlst = add_magic_cookie(s, strlst); + + ret = server_add_txt_strlst_nocopy(s, g, interface, protocol, (flags & AVAHI_PUBLISH_IS_PROXY) | AVAHI_PUBLISH_UNIQUE, AVAHI_DEFAULT_TTL, svc_name, strlst); + strlst = NULL; + + if (ret < 0) + goto fail; + + /* Add service type enumeration record */ + + ret = avahi_server_add_ptr(s, g, interface, protocol, (flags & AVAHI_PUBLISH_IS_PROXY), AVAHI_DEFAULT_TTL, enum_ptr, ptr_name); + +fail: + + avahi_string_list_free(strlst); + avahi_free(h); + + return ret; +} + +int avahi_server_add_service_strlst( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + const char *name, + const char *type, + const char *domain, + const char *host, + uint16_t port, + AvahiStringList *strlst) { + + assert(s); + assert(type); + assert(name); + + return server_add_service_strlst_nocopy(s, g, interface, protocol, flags, name, type, domain, host, port, avahi_string_list_copy(strlst)); +} + +int avahi_server_add_service_va( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + const char *name, + const char *type, + const char *domain, + const char *host, + uint16_t port, + va_list va) { + + assert(s); + assert(type); + assert(name); + + return server_add_service_strlst_nocopy(s, g, interface, protocol, flags, name, type, domain, host, port, avahi_string_list_new_va(va)); +} + +int avahi_server_add_service( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + const char *name, + const char *type, + const char *domain, + const char *host, + uint16_t port, + ... ){ + + va_list va; + int ret; + + va_start(va, port); + ret = avahi_server_add_service_va(s, g, interface, protocol, flags, name, type, domain, host, port, va); + va_end(va); + + return ret; +} + +static int server_update_service_txt_strlst_nocopy( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + const char *name, + const char *type, + const char *domain, + AvahiStringList *strlst) { + + char svc_name[AVAHI_DOMAIN_NAME_MAX]; + int ret = AVAHI_OK; + + assert(s); + assert(type); + assert(name); + + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, AVAHI_FLAGS_VALID(flags, AVAHI_PUBLISH_IS_PROXY|AVAHI_PUBLISH_NO_COOKIE), AVAHI_ERR_INVALID_FLAGS); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, avahi_is_valid_service_name(name), AVAHI_ERR_INVALID_SERVICE_NAME); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, avahi_is_valid_service_type_strict(type), AVAHI_ERR_INVALID_SERVICE_TYPE); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME); + + if (!domain) + domain = s->domain_name; + + if ((ret = avahi_service_name_join(svc_name, sizeof(svc_name), name, type, domain)) < 0) { + avahi_server_set_errno(s, ret); + goto fail; + } + + /* Add TXT record */ + if (!(flags & AVAHI_PUBLISH_NO_COOKIE)) + strlst = add_magic_cookie(s, strlst); + + ret = server_add_txt_strlst_nocopy(s, g, interface, protocol, (flags & AVAHI_PUBLISH_IS_PROXY) | AVAHI_PUBLISH_UNIQUE | AVAHI_PUBLISH_UPDATE, AVAHI_DEFAULT_TTL, svc_name, strlst); + strlst = NULL; + +fail: + + avahi_string_list_free(strlst); + + return ret; +} + +int avahi_server_update_service_txt_strlst( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + const char *name, + const char *type, + const char *domain, + AvahiStringList *strlst) { + + return server_update_service_txt_strlst_nocopy(s, g, interface, protocol, flags, name, type, domain, avahi_string_list_copy(strlst)); +} + +/** Update the TXT record for a service with the NULL terminated list of strings of the va_list. */ +int avahi_server_update_service_txt_va( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + const char *name, + const char *type, + const char *domain, + va_list va) { + + return server_update_service_txt_strlst_nocopy(s, g, interface, protocol, flags, name, type, domain, avahi_string_list_new_va(va)); +} + +/** Update the TXT record for a service with the NULL termonate list of strings */ +int avahi_server_update_service_txt( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + const char *name, + const char *type, + const char *domain, + ...) { + + va_list va; + int ret; + + va_start(va, domain); + ret = avahi_server_update_service_txt_va(s, g, interface, protocol, flags, name, type, domain, va); + va_end(va); + + return ret; +} + +int avahi_server_add_service_subtype( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + const char *name, + const char *type, + const char *domain, + const char *subtype) { + + int ret = AVAHI_OK; + char svc_name[AVAHI_DOMAIN_NAME_MAX], ptr_name[AVAHI_DOMAIN_NAME_MAX]; + + assert(name); + assert(type); + assert(subtype); + + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, AVAHI_FLAGS_VALID(flags, 0), AVAHI_ERR_INVALID_FLAGS); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, avahi_is_valid_service_name(name), AVAHI_ERR_INVALID_SERVICE_NAME); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, avahi_is_valid_service_type_strict(type), AVAHI_ERR_INVALID_SERVICE_TYPE); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME); + AVAHI_CHECK_VALIDITY_SET_RET_GOTO_FAIL(s, avahi_is_valid_service_subtype(subtype), AVAHI_ERR_INVALID_SERVICE_SUBTYPE); + + if (!domain) + domain = s->domain_name; + + if ((ret = avahi_service_name_join(svc_name, sizeof(svc_name), name, type, domain)) < 0 || + (ret = avahi_service_name_join(ptr_name, sizeof(ptr_name), NULL, subtype, domain)) < 0) { + avahi_server_set_errno(s, ret); + goto fail; + } + + if ((ret = avahi_server_add_ptr(s, g, interface, protocol, flags & AVAHI_PUBLISH_IS_PROXY, AVAHI_DEFAULT_TTL, ptr_name, svc_name)) < 0) + goto fail; + +fail: + + return ret; +} + +static void hexstring(char *s, size_t sl, const void *p, size_t pl) { + static const char hex[] = "0123456789abcdef"; + int b = 0; + const uint8_t *k = p; + + while (sl > 1 && pl > 0) { + *(s++) = hex[(b ? *k : *k >> 4) & 0xF]; + + if (b) { + k++; + pl--; + } + + b = !b; + + sl--; + } + + if (sl > 0) + *s = 0; +} + +int avahi_server_add_dns_server_address( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + const char *domain, + AvahiDNSServerType type, + const AvahiAddress *address, + uint16_t port /** should be 53 */) { + + AvahiRecord *r; + int ret; + char n[64], h[64]; + + assert(s); + assert(address); + + if (!AVAHI_IF_VALID(interface)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_INTERFACE); + + if (!AVAHI_PROTO_VALID(protocol) || !AVAHI_PROTO_VALID(address->proto)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_PROTOCOL); + + if (!AVAHI_FLAGS_VALID(flags, 0) || (type != AVAHI_DNS_SERVER_UPDATE && type != AVAHI_DNS_SERVER_RESOLVE)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_FLAGS); + + if (port == 0) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_PORT); + + if (domain && !avahi_is_valid_domain_name(domain)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_DOMAIN_NAME); + + if (!domain) + domain = s->domain_name; + + if (address->proto == AVAHI_PROTO_INET) { + hexstring(h, sizeof(h), &address->data, sizeof(AvahiIPv4Address)); + snprintf(n, sizeof(n), "ip-%s.%s", h, domain); + r = avahi_record_new_full(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A, AVAHI_DEFAULT_TTL_HOST_NAME); + r->data.a.address = address->data.ipv4; + } else { + hexstring(h, sizeof(h), &address->data, sizeof(AvahiIPv6Address)); + snprintf(n, sizeof(n), "ip6-%s.%s", h, domain); + r = avahi_record_new_full(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA, AVAHI_DEFAULT_TTL_HOST_NAME); + r->data.aaaa.address = address->data.ipv6; + } + + if (!r) + return avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + + ret = avahi_server_add(s, g, interface, protocol, AVAHI_PUBLISH_UNIQUE | AVAHI_PUBLISH_ALLOW_MULTIPLE, r); + avahi_record_unref(r); + + if (ret < 0) + return ret; + + return avahi_server_add_dns_server_name(s, g, interface, protocol, flags, domain, type, n, port); +} + +int avahi_server_add_dns_server_name( + AvahiServer *s, + AvahiSEntryGroup *g, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiPublishFlags flags, + const char *domain, + AvahiDNSServerType type, + const char *name, + uint16_t port /** should be 53 */) { + + int ret = -1; + char t[256], *d = NULL, *n = NULL; + AvahiRecord *r; + + assert(s); + assert(name); + + if (!AVAHI_IF_VALID(interface)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_INTERFACE); + + if (!AVAHI_PROTO_VALID(protocol)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_PROTOCOL); + + if (!AVAHI_FLAGS_VALID(flags, 0) || (type != AVAHI_DNS_SERVER_UPDATE && type != AVAHI_DNS_SERVER_RESOLVE)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_FLAGS); + + if (port == 0) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_PORT); + + if (!avahi_is_valid_domain_name(name)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_HOST_NAME); + + if (domain && !avahi_is_valid_domain_name(domain)) + return avahi_server_set_errno(s, AVAHI_ERR_INVALID_DOMAIN_NAME); + + if (!domain) + domain = s->domain_name; + + if (!(n = avahi_normalize_name_strdup(name)) || + !(d = avahi_normalize_name_strdup(domain))) { + avahi_free(n); + avahi_free(d); + return avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + } + + snprintf(t, sizeof(t), "%s.%s", type == AVAHI_DNS_SERVER_RESOLVE ? "_domain._udp" : "_dns-update._udp", d); + avahi_free(d); + + if (!(r = avahi_record_new_full(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV, AVAHI_DEFAULT_TTL_HOST_NAME))) { + avahi_free(n); + return avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + } + + r->data.srv.priority = 0; + r->data.srv.weight = 0; + r->data.srv.port = port; + r->data.srv.name = n; + ret = avahi_server_add(s, g, interface, protocol, AVAHI_PUBLISH_NULL, r); + avahi_record_unref(r); + + return ret; +} + +void avahi_s_entry_group_change_state(AvahiSEntryGroup *g, AvahiEntryGroupState state) { + assert(g); + + if (g->state == state) + return; + + assert(state <= AVAHI_ENTRY_GROUP_COLLISION); + + if (g->state == AVAHI_ENTRY_GROUP_ESTABLISHED) { + + /* If the entry group was established for a time longer then + * 5s, reset the establishment trial counter */ + + if (avahi_age(&g->established_at) > 5000000) + g->n_register_try = 0; + } + + if (state == AVAHI_ENTRY_GROUP_ESTABLISHED) + + /* If the entry group is now established, remember the time + * this happened */ + + gettimeofday(&g->established_at, NULL); + + g->state = state; + + if (g->callback) + g->callback(g->server, g, state, g->userdata); +} + +AvahiSEntryGroup *avahi_s_entry_group_new(AvahiServer *s, AvahiSEntryGroupCallback callback, void* userdata) { + AvahiSEntryGroup *g; + + assert(s); + + if (!(g = avahi_new(AvahiSEntryGroup, 1))) { + avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY); + return NULL; + } + + g->server = s; + g->callback = callback; + g->userdata = userdata; + g->dead = 0; + g->state = AVAHI_ENTRY_GROUP_UNCOMMITED; + g->n_probing = 0; + g->n_register_try = 0; + g->register_time_event = NULL; + g->register_time.tv_sec = 0; + g->register_time.tv_usec = 0; + AVAHI_LLIST_HEAD_INIT(AvahiEntry, g->entries); + + AVAHI_LLIST_PREPEND(AvahiSEntryGroup, groups, s->groups, g); + return g; +} + +void avahi_s_entry_group_free(AvahiSEntryGroup *g) { + AvahiEntry *e; + + assert(g); + assert(g->server); + + for (e = g->entries; e; e = e->by_group_next) { + if (!e->dead) { + avahi_goodbye_entry(g->server, e, 1, 1); + e->dead = 1; + } + } + + if (g->register_time_event) { + avahi_time_event_free(g->register_time_event); + g->register_time_event = NULL; + } + + g->dead = 1; + + g->server->need_group_cleanup = 1; + g->server->need_entry_cleanup = 1; +} + +static void entry_group_commit_real(AvahiSEntryGroup *g) { + assert(g); + + gettimeofday(&g->register_time, NULL); + + avahi_s_entry_group_change_state(g, AVAHI_ENTRY_GROUP_REGISTERING); + + if (!g->dead) { + avahi_announce_group(g->server, g); + avahi_s_entry_group_check_probed(g, 0); + } +} + +static void entry_group_register_time_event_callback(AvahiTimeEvent *e, void* userdata) { + AvahiSEntryGroup *g = userdata; + assert(g); + +/* avahi_log_debug("Holdoff passed, waking up and going on."); */ + + avahi_time_event_free(g->register_time_event); + g->register_time_event = NULL; + + /* Holdoff time passed, so let's start probing */ + entry_group_commit_real(g); +} + +int avahi_s_entry_group_commit(AvahiSEntryGroup *g) { + struct timeval now; + + assert(g); + assert(!g->dead); + + if (g->state != AVAHI_ENTRY_GROUP_UNCOMMITED && g->state != AVAHI_ENTRY_GROUP_COLLISION) + return avahi_server_set_errno(g->server, AVAHI_ERR_BAD_STATE); + + g->n_register_try++; + + avahi_timeval_add(&g->register_time, + 1000*(g->n_register_try >= AVAHI_RR_RATE_LIMIT_COUNT ? + AVAHI_RR_HOLDOFF_MSEC_RATE_LIMIT : + AVAHI_RR_HOLDOFF_MSEC)); + + gettimeofday(&now, NULL); + + if (avahi_timeval_compare(&g->register_time, &now) <= 0) { + /* Holdoff time passed, so let's start probing */ +/* avahi_log_debug("Holdoff passed, directly going on."); */ + + entry_group_commit_real(g); + } else { +/* avahi_log_debug("Holdoff not passed, sleeping."); */ + + /* Holdoff time has not yet passed, so let's wait */ + assert(!g->register_time_event); + g->register_time_event = avahi_time_event_new(g->server->time_event_queue, &g->register_time, entry_group_register_time_event_callback, g); + + avahi_s_entry_group_change_state(g, AVAHI_ENTRY_GROUP_REGISTERING); + } + + return AVAHI_OK; +} + +void avahi_s_entry_group_reset(AvahiSEntryGroup *g) { + AvahiEntry *e; + assert(g); + + for (e = g->entries; e; e = e->by_group_next) { + if (!e->dead) { + avahi_goodbye_entry(g->server, e, 1, 1); + e->dead = 1; + } + } + g->server->need_entry_cleanup = 1; + + if (g->register_time_event) { + avahi_time_event_free(g->register_time_event); + g->register_time_event = NULL; + } + + g->n_probing = 0; + + gettimeofday(&g->register_time, NULL); + + avahi_s_entry_group_change_state(g, AVAHI_ENTRY_GROUP_UNCOMMITED); +} + +int avahi_entry_is_commited(AvahiEntry *e) { + assert(e); + assert(!e->dead); + + return !e->group || + e->group->state == AVAHI_ENTRY_GROUP_REGISTERING || + e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED; +} + +AvahiEntryGroupState avahi_s_entry_group_get_state(AvahiSEntryGroup *g) { + assert(g); + assert(!g->dead); + + return g->state; +} + +void avahi_s_entry_group_set_data(AvahiSEntryGroup *g, void* userdata) { + assert(g); + + g->userdata = userdata; +} + +void* avahi_s_entry_group_get_data(AvahiSEntryGroup *g) { + assert(g); + + return g->userdata; +} + +int avahi_s_entry_group_is_empty(AvahiSEntryGroup *g) { + AvahiEntry *e; + assert(g); + + /* Look for an entry that is not dead */ + for (e = g->entries; e; e = e->by_group_next) + if (!e->dead) + return 0; + + return 1; +} |