void Browser::updateService(const char *name,
const char *host_name,
const AvahiAddress *a,
uint16_t port,
AvahiStringList *txt) {
// Find the service in our list
Browser::Service s(name);
auto it = std::lower_bound(services_.begin(), services_.end(), s);
if (it == services_.end() || it->service_name != name) {
return;
}
Browser::Service &svc = *it;
auto index = createIndex(it - services_.begin(), 0);
svc.host_name = host_name;
char addr[AVAHI_ADDRESS_STR_MAX];
avahi_address_snprint(addr, sizeof(addr), a);
svc.address = addr;
svc.port = port;
svc.txt.clear();
for (auto item = txt; item != nullptr; item = avahi_string_list_get_next(item)) {
// TODO: this probably isn't actually UTF-8
svc.txt.push_front(
QString::fromUtf8(
reinterpret_cast<const char*>(avahi_string_list_get_text(item)),
avahi_string_list_get_size(item)));
}
Q_EMIT dataChanged(index, index);
}
/* TODO: Docs. Return value is only valid as long as @txt is. Reference: RFC 6763, §6. */
GHashTable *
_ostree_txt_records_parse (AvahiStringList *txt)
{
AvahiStringList *l;
g_autoptr(GHashTable) out = NULL;
out = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify) g_bytes_unref);
for (l = txt; l != NULL; l = avahi_string_list_get_next (l))
{
const guint8 *txt;
gsize txt_len;
const gchar *key;
const guint8 *value;
gsize key_len, value_len;
g_autofree gchar *key_allocated = NULL;
g_autoptr(GBytes) value_allocated = NULL;
txt = avahi_string_list_get_text (l);
txt_len = avahi_string_list_get_size (l);
if (!parse_txt_record (txt, txt_len, &key, &key_len, &value, &value_len))
{
g_debug ("Ignoring invalid TXT record of length %" G_GSIZE_FORMAT,
txt_len);
continue;
}
key_allocated = g_ascii_strdown (key, key_len);
if (g_hash_table_lookup_extended (out, key_allocated, NULL, NULL))
{
g_debug ("Ignoring duplicate TXT record ‘%s’", key_allocated);
continue;
}
/* Distinguish between the case where the entire record is the key
* (value == NULL) and the case where the record is the key + ‘=’ and the
* value is empty (value != NULL && value_len == 0). */
if (value != NULL)
value_allocated = g_bytes_new_static (value, value_len);
g_hash_table_insert (out, g_steal_pointer (&key_allocated), g_steal_pointer (&value_allocated));
}
return g_steal_pointer (&out);
}
static int
spawn_record_browser(AvahiClient *c, AvahiIfIndex intf, AvahiProtocol proto, const char *hostname, const char *domain,
uint16_t type, struct mdns_browser *mb, const char *name, uint16_t port, AvahiStringList *txt)
{
AvahiRecordBrowser *rb;
struct mdns_record_browser *rb_data;
char *key;
char *value;
char *ptr;
size_t len;
int ret;
rb_data = (struct mdns_record_browser *)malloc(sizeof(struct mdns_record_browser));
if (!rb_data)
{
DPRINTF(E_LOG, L_MDNS, "Out of memory for record browser data\n");
return -1;
}
memset(rb_data, 0, sizeof(struct mdns_record_browser));
rb_data->mb = mb;
rb_data->port = port;
rb_data->name = strdup(name);
if (!rb_data->name)
{
DPRINTF(E_LOG, L_MDNS, "Out of memory for service name\n");
goto out_free_rb;
}
rb_data->domain = strdup(domain);
if (!rb_data->domain)
{
DPRINTF(E_LOG, L_MDNS, "Out of memory for service domain\n");
goto out_free_name;
}
while (txt)
{
len = avahi_string_list_get_size(txt);
key = (char *)avahi_string_list_get_text(txt);
ptr = memchr(key, '=', len);
if (!ptr)
{
value = "";
len = 0;
}
else
{
*ptr = '\0';
value = ptr + 1;
len -= strlen(key) + 1;
}
ret = keyval_add_size(&rb_data->txt_kv, key, value, len);
if (ptr)
*ptr = '=';
if (ret < 0)
{
DPRINTF(E_LOG, L_MDNS, "Could not build TXT record keyval\n");
goto out_free_keyval;
}
txt = avahi_string_list_get_next(txt);
}
rb = NULL;
switch (type)
{
case AVAHI_DNS_TYPE_A:
rb = avahi_record_browser_new(c, intf, proto, hostname,
AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A, 0,
browse_record_callback_v4, rb_data);
if (!rb)
DPRINTF(E_LOG, L_MDNS, "Could not create v4 record browser for host %s: %s\n",
hostname, avahi_strerror(avahi_client_errno(c)));
break;
case AVAHI_DNS_TYPE_AAAA:
rb = avahi_record_browser_new(c, intf, proto, hostname,
AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA, 0,
browse_record_callback_v6, rb_data);
if (!rb)
DPRINTF(E_LOG, L_MDNS, "Could not create v4 record browser for host %s: %s\n",
hostname, avahi_strerror(avahi_client_errno(c)));
break;
}
if (!rb)
goto out_free_keyval;
return 0;
out_free_keyval:
keyval_clear(&rb_data->txt_kv);
free(rb_data->domain);
out_free_name:
free(rb_data->name);
out_free_rb:
free(rb_data);
return -1;
}
static void
browse_resolve_callback(AvahiServiceResolver *r, AvahiIfIndex intf, AvahiProtocol proto, AvahiResolverEvent event,
const char *name, const char *type, const char *domain, const char *hostname, const AvahiAddress *addr,
uint16_t port, AvahiStringList *txt, AvahiLookupResultFlags flags, void *userdata)
{
char address[AVAHI_ADDRESS_STR_MAX + IF_NAMESIZE + 2];
char ifname[IF_NAMESIZE];
struct keyval txt_kv;
struct mdns_browser *mb;
char *key;
char *value;
size_t len;
int family;
int ll;
int ret;
mb = (struct mdns_browser *)userdata;
switch (event)
{
case AVAHI_RESOLVER_FAILURE:
DPRINTF(E_LOG, L_MDNS, "Avahi Resolver failure: service '%s' type '%s': %s\n", name, type,
avahi_strerror(avahi_client_errno(mdns_client)));
break;
case AVAHI_RESOLVER_FOUND:
DPRINTF(E_DBG, L_MDNS, "Avahi Resolver: resolved service '%s' type '%s' proto %d\n", name, type, proto);
// KK - if I reject 192.168.* my AirTunes get rejected.
// How does avahi passes multiple IP addresses?
// ll = is_link_local(addr);
ll = 0;
switch (proto)
{
case AVAHI_PROTO_INET:
avahi_record_browser_new()
if (ll)
{
family = AF_UNSPEC;
DPRINTF(E_DBG, L_MDNS, "Discarding IPv4 LL address\n");
break;
}
family = AF_INET;
avahi_address_snprint(address, sizeof(address), addr);
break;
case AVAHI_PROTO_INET6:
avahi_address_snprint(address, sizeof(address), addr);
if (ll)
{
DPRINTF(E_DBG, L_MDNS, "Appending interface name to IPv6 LL address\n");
if (!if_indextoname(intf, ifname))
{
DPRINTF(E_LOG, L_MDNS, "Could not map interface index %d to a name\n", intf);
family = AF_UNSPEC;
break;
}
len = strlen(address);
ret = snprintf(address + len, sizeof(address) - len, "%%%s", ifname);
if ((ret < 0) || (ret > sizeof(address) - len))
{
DPRINTF(E_LOG, L_MDNS, "Buffer too short for scoped IPv6 LL\n");
family = AF_UNSPEC;
break;
}
DPRINTF(E_DBG, L_MDNS, "Scoped IPv6 LL: %s\n", address);
}
family = AF_INET6;
break;
default:
DPRINTF(E_INFO, L_MDNS, "Avahi Resolver: unknown protocol %d\n", proto);
family = AF_UNSPEC;
break;
}
if (family == AF_UNSPEC)
break;
memset(&txt_kv, 0, sizeof(struct keyval));
while (txt)
{
len = avahi_string_list_get_size(txt);
key = (char *)avahi_string_list_get_text(txt);
value = memchr(key, '=', len);
if (!value)
{
value = "";
len = 0;
}
else
{
*value = '\0';
value++;
len -= strlen(key) + 1;
}
ret = keyval_add_size(&txt_kv, key, value, len);
if (ret < 0)
{
DPRINTF(E_LOG, L_MDNS, "Could not build TXT record keyval\n");
goto out_clear_txt_kv;
}
txt = avahi_string_list_get_next(txt);
}
/* Execute callback (mb->cb) with all the data */
mb->cb(name, type, domain, hostname, family, address, port, &txt_kv);
out_clear_txt_kv:
keyval_clear(&txt_kv);
break;
}
avahi_service_resolver_free(r);
}
CAMLprim value stub_avahi_string_list_get_text(value l)
{
CAMLparam1(l);
CAMLreturn(caml_copy_string((const char *)avahi_string_list_get_text((AvahiStringList *)l)));
}
