// StationInfo requests that nl80211 return station info for the specified
// Interface.
func (c *client) StationInfo(ifi *Interface) (*StationInfo, error) {
b, err := netlink.MarshalAttributes(ifi.stationInfoAttrs())
if err != nil {
return nil, err
}
// Ask nl80211 to retrieve station info for the interface specified
// by its attributes
req := genetlink.Message{
Header: genetlink.Header{
// From nl80211.h:
// * @NL80211_CMD_GET_STATION: Get station attributes for station identified by
// * %NL80211_ATTR_MAC on the interface identified by %NL80211_ATTR_IFINDEX.
Command: nl80211.CmdGetStation,
Version: c.familyVersion,
},
Data: b,
}
flags := netlink.HeaderFlagsRequest | netlink.HeaderFlagsDump
msgs, err := c.c.Execute(req, c.familyID, flags)
if err != nil {
return nil, err
}
switch len(msgs) {
case 0:
return nil, os.ErrNotExist
case 1:
break
default:
return nil, errMultipleMessages
}
if err := c.checkMessages(msgs, nl80211.CmdNewStation); err != nil {
return nil, err
}
return parseStationInfo(msgs[0].Data)
}
// Get retrieves a generic netlink family with the specified name. If the
// family does not exist, the error value can be checked using os.IsNotExist.
func (s *FamilyService) Get(name string) (Family, error) {
b, err := netlink.MarshalAttributes([]netlink.Attribute{{
Type: attrFamilyName,
Data: nlenc.Bytes(name),
}})
if err != nil {
return Family{}, err
}
req := Message{
Header: Header{
Command: ctrlCommandGetFamily,
Version: ctrlVersion,
},
Data: b,
}
msgs, err := s.c.Execute(req, Controller, netlink.HeaderFlagsRequest)
if err != nil {
return Family{}, err
}
// TODO(mdlayher): consider interpreting generic netlink header values
families, err := buildFamilies(msgs)
if err != nil {
return Family{}, err
}
if len(families) != 1 {
// If this were to ever happen, netlink must be in a state where
// its answers cannot be trusted
panic(fmt.Sprintf("netlink returned multiple families for name: %q", name))
}
return families[0], nil
}