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[mdns] If configured, use bind_address to set network interface 

Otherwise keep using AVAHI_IF_UNSPEC. Resolves #1519.
This commit is contained in:
ejurgensen 2022-07-14 21:29:21 +02:00
parent 3754871c73
commit 1725d5cef6
1 changed files with 39 additions and 5 deletions
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44
src/mdns_avahi.c
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@ -65,6 +65,7 @@ extern struct event_base *evbase_main;
static AvahiClient *mdns_client = NULL;
static AvahiEntryGroup *mdns_group = NULL;
static AvahiIfIndex mdns_interface = AVAHI_IF_UNSPEC;
struct AvahiWatch
@ -445,6 +446,32 @@ avahi_address_make(AvahiAddress *addr, AvahiProtocol proto, const void *rdata, s
return -1;
}
static AvahiIfIndex
interface_index_get(const char *addr)
{
char ifname[64];
unsigned int index;
int ret;
ret = net_if_get(ifname, sizeof(ifname), addr);
if (ret < 0)
{
DPRINTF(E_LOG, L_MDNS, "Could not find network interface matching address %s\n", addr);
return AVAHI_IF_UNSPEC;
}
index = if_nametoindex(ifname);
if (index == 0)
{
DPRINTF(E_LOG, L_MDNS, "Could not find index of network interface %s: %s\n", ifname, strerror(errno));
return AVAHI_IF_UNSPEC;
}
DPRINTF(E_DBG, L_MDNS, "Using network interface %s (index %u)\n", ifname, index);
return (AvahiIfIndex)index;
}
// Creates a resolver and adds to list
static int
resolver_add(struct mdns_resolver **head, AvahiIfIndex intf, AvahiProtocol proto,
@ -834,7 +861,7 @@ browse_callback(AvahiServiceBrowser *b, AvahiIfIndex intf, AvahiProtocol proto,
avahi_service_browser_free(b);
b = avahi_service_browser_new(mdns_client, AVAHI_IF_UNSPEC, mb->protocol, mb->type, NULL, 0, browse_callback, mb);
b = avahi_service_browser_new(mdns_client, mdns_interface, mb->protocol, mb->type, NULL, 0, browse_callback, mb);
if (!b)
{
DPRINTF(E_LOG, L_MDNS, "Failed to recreate service browser (service type %s): %s\n", mb->type, MDNSERR);
@ -923,7 +950,7 @@ create_group_entry(struct mdns_group_entry *ge, int commit)
{
DPRINTF(E_DBG, L_MDNS, "Adding service %s/%s\n", ge->name, ge->type);
ret = avahi_entry_group_add_service_strlst(mdns_group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0,
ret = avahi_entry_group_add_service_strlst(mdns_group, mdns_interface, AVAHI_PROTO_UNSPEC, 0,
ge->name, ge->type,
NULL, NULL, ge->port, ge->txt);
if (ret < 0)
@ -966,7 +993,7 @@ create_group_entry(struct mdns_group_entry *ge, int commit)
}
// ret + 1 should be the string length of rdata incl. 0-terminator
ret = avahi_entry_group_add_record(mdns_group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
ret = avahi_entry_group_add_record(mdns_group, mdns_interface, AVAHI_PROTO_UNSPEC,
AVAHI_PUBLISH_USE_MULTICAST | AVAHI_PUBLISH_ALLOW_MULTIPLE,
ge->name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_CNAME,
AVAHI_DEFAULT_TTL, rdata, ret + 1);
@ -1035,7 +1062,7 @@ client_callback(AvahiClient *c, AvahiClientState state, AVAHI_GCC_UNUSED void *
for (mb = browser_list; mb; mb = mb->next)
{
b = avahi_service_browser_new(mdns_client, AVAHI_IF_UNSPEC, mb->protocol, mb->type, NULL, 0, browse_callback, mb);
b = avahi_service_browser_new(mdns_client, mdns_interface, mb->protocol, mb->type, NULL, 0, browse_callback, mb);
if (!b)
DPRINTF(E_LOG, L_MDNS, "Failed to recreate service browser (service type %s): %s\n", mb->type, MDNSERR);
}
@ -1090,10 +1117,17 @@ client_callback(AvahiClient *c, AvahiClientState state, AVAHI_GCC_UNUSED void *
int
mdns_init(void)
{
const char *cfgaddr;
int error;
DPRINTF(E_DBG, L_MDNS, "Initializing Avahi mDNS\n");
cfgaddr = cfg_getstr(cfg_getsec(cfg, "general"), "bind_address");
if (cfgaddr)
{
mdns_interface = interface_index_get(cfgaddr);
}
mdns_client = avahi_client_new(&ev_poll_api, AVAHI_CLIENT_NO_FAIL, client_callback, NULL, &error);
if (!mdns_client)
{
@ -1202,7 +1236,7 @@ mdns_browse(char *type, mdns_browse_cb cb, enum mdns_options flags)
mb->next = browser_list;
browser_list = mb;
b = avahi_service_browser_new(mdns_client, AVAHI_IF_UNSPEC, mb->protocol, mb->type, NULL, 0, browse_callback, mb);
b = avahi_service_browser_new(mdns_client, mdns_interface, mb->protocol, mb->type, NULL, 0, browse_callback, mb);
if (!b)
{
DPRINTF(E_LOG, L_MDNS, "Failed to create service browser: %s\n", MDNSERR);