bsd:u / bsd:s

This is "nn::socket::sf::IClient".

Cmd	Name
0	RegisterClient (Initialize)
1	StartMonitoring
2	Socket
3	SocketExempt
4	Open
5	Select
6	Poll
7	Sysctl
8	Recv
9	RecvFrom
10	Send
11	SendTo
12	Accept
13	Bind
14	Connect
15	GetPeerName
16	GetSockName
17	GetSockOpt
18	Listen
19	Ioctl
20	Fcntl
21	SetSockOpt
22	Shutdown
23	ShutdownAllSockets
24	Write
25	Read
26	Close
27	DuplicateSocket
28	GetResourceStatistics
29	[3.0.0+] RecvMMsg
30	[3.0.0+] SendMMsg

Open: can open /dev/bpf (and most likely only that file, given bsdservices' binary contents). This can be used, for example, to enable promiscuous mode, see FreeBSD's /dev/bpf for more details.

Initalize

Takes a #BsdConfig (made-up name), the PID, the size of the transfer memory and a copy-handle of the latter.

BsdConfig

typedef struct  {
    u32 version;                    ///< Observed 1 on 2.0 LibAppletWeb, 2 on 3.0.
    u32 tcpSendBufferSize;          ///< Size of the TCP send buffer (initial or fixed).
    u32 tcpReceiveBufferSize;       ///< Size of the TCP recieve buffer (initial or fixed).
    u32 tcpSendBufferMaxSize;       ///< Maximum size of the TCP send buffer. If it is 0, the initial size of the buffer is actually fixed.
    u32 tcpReceiveBufferMaxSize;    ///< Maximum size of the TCP receive buffer. If it is 0, the initial size of the buffer is actually fixed.
    u32 udpSendBufferSize;          ///< Size of the TCP send buffer (typically 0x2400 bytes).
    u32 udpSendBufferSize;          ///< Size of the TCP send buffer (typically 0xA500 bytes).
    s32 socketBufferEffiency;       ///< Number of buffers for each socket (standard values range from 1 to 8).
} BsdConfig;

sfdnsres

This is "nn::socket::resolver::IResolver".

Cmd	Name
0	SetDnsAddressesPrivate
1	GetDnsAddressPrivate
2	GetHostByName
3	GetHostByAddr
4	GetHostStringError
5	GetGaiStringError
6	#GetAddrInfo
7	GetNameInfo
8	RequestCancelHandle
9	CancelSocketCall

GetAddrInfo

Takes three type 5 buffers (host, port, and hints), and a type 6 buffer (the output addrinfos). Also takes a u8 (padded to 4 bytes so the next raw parameter can align), a u32, and a u64. The u8 is a boolean for whether to enable "nsd resolve" (1) or not (0). Not sure what the u32 is. It seems to either come from a parameter to GetAddrInfo or be zero. The u64 is most likely a placeholder for the server to copy the PID into and should be zero. Both hints and the output buffer contain serialized addrinfo chains. The hints buffer is sized 0x400 bytes long by default, and the output buffer 0x1000 bytes.

Addrinfo Serialization Format

Each struct addrinfo in the linked list is serialized according to this format and then written to the buffer. All numbers are in network byte order.

Size (bytes)	Name	Notes
4	Magic	Needs to be 0xBEEFCAFE. Seriously.
4	ai_flags
4	ai_family
4	ai_socktype
4	ai_protocol
4	ai_addrlen
ai_addrlen ? ai_addrlen : 4	ai_addr
null-terminated string	ai_canonname

If ai_addrlen is zero, ai_addr will occupy 4 bytes.

Size (bytes)	Name	Notes
4	ai_addr

If ai_family is recognized as AF_INET6 (28) or AF_INET (2), ai_addr is read as struct sockaddr_in or struct sockaddr_in6. Otherwise, it's just read as u8[ai_addrlen].

The list should be terminated with a sentinel four-byte zero value.

nsd:u / nsd:a

This is "nn::nsd::detail::IManager".

Cmd	Name
10	GetSettingName
11	GetEnvironmentIdentifier
12	GetDeviceId
13	DeleteSettings
14	ImportSettings
20	Resolve
21	ResolveEx
30	GetNasServiceSetting
31	GetNasServiceSettingEx
40	GetNasRequestFqdn
41	GetNasRequestFqdnEx
42	GetNasApiFqdn
43	GetNasApiFqdnEx
50	GetCurrentSetting
60	ReadSaveDataFromFsForTest
61	WriteSaveDataToFsForTest
62	DeleteSaveDataOfFsForTest

Sockets services

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