PROTOCOLS
Resolver
Defined in fuchsia.net.mdns/mdns.fidl
Discoverable protocol for resolving host names to IP addresses.
ResolveHostName
Gets the addresses for the specified host. timeout specifies how long
the service should wait before giving up when waiting for a response to
a resolution query. In typical use, a timeout of two or three seconds
is recommended.
A successful resolution may return one or both addresses. An unsuccessful resolution is indicated when both addresses are null.
Request
| Name | Type |
|---|---|
host |
string[255]
|
timeout |
int64
|
Response
| Name | Type |
|---|---|
v4_address |
fuchsia.net/Ipv4Address?
|
v6_address |
fuchsia.net/Ipv6Address?
|
Subscriber
Defined in fuchsia.net.mdns/mdns.fidl
Discoverable protocol for finding service instances.
SubscribeToService
Subscribes to a service. The subscription lasts until subscriber is
unbound.
Request
| Name | Type |
|---|---|
service |
string[22]
|
subscriber |
ServiceSubscriber
|
Publisher
Defined in fuchsia.net.mdns/mdns.fidl
Discoverable protocol for publishing service instances.
PublishServiceInstance
Publishes a service instance. publication_responder is consulted via its
OnPublication method for initial announcements and to answer queries.
The service is published until the publication_responder channel closes. In
addition to announcements and queries for the service type, all queries
for subtypes are answered subject to filtering through the responder.
perform_probe indicates whether a probe for a conflicting instance
should be performed before publishing the instance. This value should
be true unless the instance name is known to be unique.
Request
| Name | Type |
|---|---|
service |
string[22]
|
instance |
string[63]
|
perform_probe |
bool
|
publication_responder |
PublicationResponder
|
Response
| Name | Type |
|---|---|
result |
Publisher_PublishServiceInstance_Result
|
ServiceSubscriber
Defined in fuchsia.net.mdns/mdns.fidl
Client-implemented interface for subscribers. Method replies are used to throttle traffic. The service won't necessarily wait for a reply before calling another method.
OnInstanceDiscovered
Notifies the subscriber that a service instance has been discovered.
Request
| Name | Type |
|---|---|
instance |
ServiceInstance
|
Response
| Name | Type |
|---|
OnInstanceChanged
Notifies the subscriber that addresses or text for a known service instance have changed.
Request
| Name | Type |
|---|---|
instance |
ServiceInstance
|
Response
| Name | Type |
|---|
OnInstanceLost
Notifies the subscriber that a known service instance has been lost.
Request
| Name | Type |
|---|---|
service |
string[22]
|
instance |
string[63]
|
Response
| Name | Type |
|---|
PublicationResponder
Defined in fuchsia.net.mdns/mdns.fidl
Client-supplied publication responder interface.
OnPublication
Provides instance information for initial announcements and query
responses relating to the service instance specified in
Publisher.PublishServiceInstance. query indicates whether data is
requested for an initial announcement (false) or in response to a query
(true). If the publication relates to a subtype of the service,
subtype contains the subtype, otherwise it is null. If publication
is null, no announcement or response is transmitted. Strings in text
are transmitted in the TXT record.
Request
| Name | Type |
|---|---|
query |
bool
|
subtype |
string[63]?
|
Response
| Name | Type |
|---|---|
publication |
Publication?
|
SetSubtypes
Sets the subtypes for the service instance. The specified subtypes will be announced subject to filtering through the responder. The initial subtype collection is empty.
Response
| Name | Type |
|---|---|
subtypes |
vector<string>
|
Reannounce
Initiates reannouncement of the service instance due to a change in the
instance's port number or text strings. All announcements are filtered
through OnPublication, which replies with the new port and text
values.
Response
| Name | Type |
|---|
STRUCTS
Publisher_PublishServiceInstance_Response
generated
| Name | Type | Description | Default |
|---|
ServiceInstance
Defined in fuchsia.net.mdns/mdns.fidl
Describes a service instance.
| Name | Type | Description | Default |
|---|---|---|---|
service |
string[22]
|
The name of the service. | No default |
instance |
string[63]
|
The name of the service instance. | No default |
endpoints |
vector<fuchsia.net/Endpoint>[2]
|
Endpoints for the service. If two endpoints are supplied, one will be a V4 and the other will be a V6. | No default |
text |
vector<string>
|
Text strings describing the instance. | No default |
srv_priority |
uint16
|
The priority of the SRV resource record for this publication. See [RFC6763](https://tools.ietf.org/html/rfc6763) for details. | No default |
srv_weight |
uint16
|
The weight of the SRV resource record for this publication. See [RFC6763](https://tools.ietf.org/html/rfc6763) for details. | No default |
Publication
Defined in fuchsia.net.mdns/mdns.fidl
Describes an initial instance announcement or query response. In typical
use, the default SRV priority, SRV weight and TTL values should be used. TTL
values are rounded down to the nearest second. TTL values less than one
second are not permitted and will result in the PublicationResponder
channel being closed.
| Name | Type | Description | Default |
|---|---|---|---|
port |
uint16
|
The port at which the service instance is addressable. | No default |
text |
vector<string>
|
Text strings describing the instance. | No default |
srv_priority |
uint16
|
The priority of the SRV resource record for this publication. See [RFC6763](https://tools.ietf.org/html/rfc6763) for details. | DEFAULT_SRV_PRIORITY |
srv_weight |
uint16
|
The weight of the SRV resource record for this publication. See [RFC6763](https://tools.ietf.org/html/rfc6763) for details. | DEFAULT_SRV_WEIGHT |
ptr_ttl |
int64
|
Time-to-live for PTR resource records. | DEFAULT_PTR_TTL |
srv_ttl |
int64
|
Time-to-live for SRV resource records. | DEFAULT_SRV_TTL |
txt_ttl |
int64
|
Time-to-live for TXT resource records. | DEFAULT_TXT_TTL |
ENUMS
Error
Type: int32
Defined in fuchsia.net.mdns/mdns.fidl
Error values for instance publishing.
| Name | Value | Description |
|---|---|---|
INVALID_SERVICE_NAME |
1 |
The specified service name is invalid. |
INVALID_INSTANCE_NAME |
2 |
The specified instance name is invalid. |
ALREADY_PUBLISHED_LOCALLY |
3 |
The specified service instance is already being published by this mDNS implementation. |
ALREADY_PUBLISHED_ON_SUBNET |
4 |
The specified service instance is already being published by another host on the subnet. This result occurs when an initial probe discovers a conflicting instance. |
UNIONS
Publisher_PublishServiceInstance_Result
generated
| Name | Type | Description |
|---|---|---|
response |
Publisher_PublishServiceInstance_Response
|
|
err |
Error
|
CONSTANTS
| Name | Value | Type | Description |
|---|---|---|---|
| DEFAULT_SRV_PRIORITY |
0
|
uint16 |
|
| DEFAULT_SRV_WEIGHT |
0
|
uint16 |
|
| DEFAULT_PTR_TTL |
4500000000000
|
int64 |
|
| DEFAULT_SRV_TTL |
120000000000
|
int64 |
|
| DEFAULT_TXT_TTL |
4500000000000
|
int64 |