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ljsocket.lua
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ljsocket.lua
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local ffi = require("ffi")
local socket = {}
local e = {}
local errno = {}
do
local C
if ffi.os == "Windows" then
C = assert(ffi.load("ws2_32"))
else
C = ffi.C
end
local M = {}
local function generic_function(C_name, cdef, alias, size_error_handling)
ffi.cdef(cdef)
alias = alias or C_name
local func_name = alias
local func = C[C_name]
if size_error_handling == false then
socket[func_name] = func
elseif size_error_handling then
socket[func_name] = function(...)
local len = func(...)
if len < 0 then
return nil, socket.lasterror()
end
return len
end
else
socket[func_name] = function(...)
local ret = func(...)
if ret == 0 then
return true
end
return nil, socket.lasterror()
end
end
end
ffi.cdef[[
struct in_addr {
uint32_t s_addr;
};
struct in6_addr {
union {
uint8_t u6_addr8[16];
uint16_t u6_addr16[8];
uint32_t u6_addr32[4];
} u6_addr;
};
]]
-- https://www.cs.dartmouth.edu/~sergey/cs60/on-sockaddr-structs.txt
if ffi.os == "OSX" then
ffi.cdef[[
struct sockaddr {
uint8_t sa_len;
uint8_t sa_family;
char sa_data[14];
};
struct sockaddr_in {
uint8_t sin_len;
uint8_t sin_family;
uint16_t sin_port;
struct in_addr sin_addr;
char sin_zero[8];
};
struct sockaddr_in6 {
uint8_t sin6_len;
uint8_t sin6_family;
uint16_t sin6_port;
uint32_t sin6_flowinfo;
struct in6_addr sin6_addr;
uint32_t sin6_scope_id;
};
]]
elseif ffi.os == "Windows" then
ffi.cdef[[
struct sockaddr {
uint16_t sa_family;
char sa_data[14];
};
struct sockaddr_in {
int16_t sin_family;
uint16_t sin_port;
struct in_addr sin_addr;
uint8_t sin_zero[8];
};
struct sockaddr_in6 {
int16_t sin6_family;
uint16_t sin6_port;
uint32_t sin6_flowinfo;
struct in6_addr sin6_addr;
uint32_t sin6_scope_id;
};
]]
else -- posix
ffi.cdef[[
struct sockaddr {
uint16_t sa_family;
char sa_data[14];
};
struct sockaddr_in {
uint16_t sin_family;
uint16_t sin_port;
struct in_addr sin_addr;
char sin_zero[8];
};
struct sockaddr_in6 {
uint16_t sin6_family;
uint16_t sin6_port;
uint32_t sin6_flowinfo;
struct in6_addr sin6_addr;
uint32_t sin6_scope_id;
};
]]
end
if ffi.os == "Windows" then
ffi.cdef[[
typedef size_t SOCKET;
struct addrinfo {
int ai_flags;
int ai_family;
int ai_socktype;
int ai_protocol;
size_t ai_addrlen;
char *ai_canonname;
struct sockaddr *ai_addr;
struct addrinfo *ai_next;
};
]]
socket.INVALID_SOCKET = ffi.new("SOCKET", -1)
elseif ffi.os == "OSX" then
ffi.cdef[[
typedef int32_t SOCKET;
struct addrinfo {
int ai_flags;
int ai_family;
int ai_socktype;
int ai_protocol;
uint32_t ai_addrlen;
char *ai_canonname;
struct sockaddr *ai_addr;
struct addrinfo *ai_next;
};
]]
socket.INVALID_SOCKET = -1
else
ffi.cdef[[
typedef int32_t SOCKET;
struct addrinfo {
int ai_flags;
int ai_family;
int ai_socktype;
int ai_protocol;
uint32_t ai_addrlen;
struct sockaddr *ai_addr;
char *ai_canonname;
struct addrinfo *ai_next;
};
]]
socket.INVALID_SOCKET = -1
end
assert(ffi.sizeof("struct sockaddr") == 16)
assert(ffi.sizeof("struct sockaddr_in") == 16)
if ffi.os == "Windows" then
ffi.cdef[[
struct pollfd {
SOCKET fd;
short events;
short revents;
};
int WSAPoll(struct pollfd *fds, unsigned long int nfds, int timeout);
uint32_t GetLastError();
uint32_t FormatMessageA(
uint32_t dwFlags,
const void* lpSource,
uint32_t dwMessageId,
uint32_t dwLanguageId,
char* lpBuffer,
uint32_t nSize,
va_list *Arguments
);
]]
local function WORD(low, high)
return bit.bor(low , bit.lshift(high , 8))
end
do
ffi.cdef[[int GetLastError();]]
local FORMAT_MESSAGE_FROM_SYSTEM = 0x00001000
local FORMAT_MESSAGE_IGNORE_INSERTS = 0x00000200
local flags = bit.bor(FORMAT_MESSAGE_IGNORE_INSERTS, FORMAT_MESSAGE_FROM_SYSTEM)
local cache = {}
function socket.lasterror(num)
num = num or ffi.C.GetLastError()
if not cache[num] then
local buffer = ffi.new("char[512]")
local len = ffi.C.FormatMessageA(flags, nil, num, 0, buffer, ffi.sizeof(buffer), nil)
cache[num] = ffi.string(buffer, len - 2)
end
return cache[num], num
end
end
do
ffi.cdef[[int WSAStartup(uint16_t version, void *wsa_data);]]
local wsa_data
if jit.arch == "x64" then
wsa_data = ffi.typeof([[struct {
uint16_t wVersion;
uint16_t wHighVersion;
unsigned short iMax_M;
unsigned short iMaxUdpDg;
char * lpVendorInfo;
char szDescription[257];
char szSystemStatus[129];
}]])
else
wsa_data = ffi.typeof([[struct {
uint16_t wVersion;
uint16_t wHighVersion;
char szDescription[257];
char szSystemStatus[129];
unsigned short iMax_M;
unsigned short iMaxUdpDg;
char * lpVendorInfo;
}]])
end
function socket.initialize()
local data = wsa_data()
if C.WSAStartup(WORD(2, 2), data) == 0 then
return data
end
return nil, socket.lasterror()
end
end
do
ffi.cdef[[int WSACleanup();]]
function socket.shutdown()
if C.WSACleanup() == 0 then
return true
end
return nil, socket.lasterror()
end
end
if jit.arch ~= "x64" then -- xp or something
ffi.cdef[[int WSAAddressToStringA(struct sockaddr *, unsigned long, void *, char *, unsigned long *);]]
function socket.inet_ntop(family, pAddr, strptr, strlen)
-- win XP: http://memset.wordpress.com/2010/10/09/inet_ntop-for-win32/
local srcaddr = ffi.new("struct sockaddr_in")
ffi.copy(srcaddr.sin_addr, pAddr, ffi.sizeof(srcaddr.sin_addr))
srcaddr.sin_family = family
local len = ffi.new("unsigned long[1]", strlen)
C.WSAAddressToStringA(ffi.cast("struct sockaddr *", srcaddr), ffi.sizeof(srcaddr), nil, strptr, len)
return strptr
end
end
generic_function("closesocket", "int closesocket(SOCKET s);", "close")
do
ffi.cdef[[int ioctlsocket(SOCKET s, long cmd, unsigned long* argp);]]
local IOCPARM_MASK = 0x7
local IOC_IN = 0x80000000
local function _IOW(x,y,t)
return bit.bor(IOC_IN, bit.lshift(bit.band(ffi.sizeof(t),IOCPARM_MASK),16), bit.lshift(x,8), y)
end
local FIONBIO = _IOW(string.byte'f', 126, "uint32_t") -- -2147195266 -- 2147772030ULL
function socket.blocking(fd, b)
local ret = C.ioctlsocket(fd, FIONBIO, ffi.new("int[1]", b and 0 or 1))
if ret == 0 then
return true
end
return nil, socket.lasterror()
end
end
function socket.poll(fds, ndfs, timeout)
local ret = C.WSAPoll(fds, ndfs, timeout)
if ret < 0 then
return nil, socket.lasterror()
end
return ret
end
else
ffi.cdef[[
struct pollfd {
SOCKET fd;
short events;
short revents;
};
int poll(struct pollfd *fds, unsigned long nfds, int timeout);
]]
do
local cache = {}
function socket.lasterror(num)
num = num or ffi.errno()
if not cache[num] then
local err = ffi.string(ffi.C.strerror(num))
cache[num] = err == "" and tostring(num) or err
end
return cache[num], num
end
end
generic_function("close", "int close(SOCKET s);")
do
ffi.cdef[[int fcntl(int, int, ...);]]
local F_GETFL = 3
local F_SETFL = 4
local O_NONBLOCK = 04000
if ffi.os == "OSX" then
O_NONBLOCK = 0x0004
end
function socket.blocking(fd, b)
local flags = ffi.C.fcntl(fd, F_GETFL, 0)
if flags < 0 then
-- error
return nil, socket.lasterror()
end
if b then
flags = bit.band(flags, bit.bnot(O_NONBLOCK))
else
flags = bit.bor(flags, O_NONBLOCK)
end
local ret = ffi.C.fcntl(fd, F_SETFL, ffi.new("int", flags))
if ret < 0 then
return nil, socket.lasterror()
end
return true
end
end
function socket.poll(fds, ndfs, timeout)
local ret = C.poll(fds, ndfs, timeout)
if ret < 0 then
return nil, socket.lasterror()
end
return ret
end
end
ffi.cdef[[
char *strerror(int errnum);
int getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res);
int getnameinfo(const struct sockaddr* sa, uint32_t salen, char* host, size_t hostlen, char* serv, size_t servlen, int flags);
void freeaddrinfo(struct addrinfo *ai);
const char *gai_strerror(int errcode);
char *inet_ntoa(struct in_addr in);
uint16_t ntohs(uint16_t netshort);
]]
function socket.getaddrinfo(node_name, service_name, hints, result)
local ret = C.getaddrinfo(node_name, service_name, hints, result)
if ret == 0 then
return true
end
return nil, ffi.string(socket.lasterror(ret))
end
function socket.getnameinfo(address, length, host, hostlen, serv, servlen, flags)
local ret = C.getnameinfo(address, length, host, hostlen, serv, servlen, flags)
if ret == 0 then
return true
end
return nil, ffi.string(socket.lasterror(ret))
end
do
ffi.cdef[[const char *inet_ntop(int __af, const void *__cp, char *__buf, unsigned int __len);]]
function socket.inet_ntop(family, addrinfo, strptr, strlen)
if C.inet_ntop(family, addrinfo, strptr, strlen) == nil then
return nil, socket.lasterror()
end
return strptr
end
end
do
ffi.cdef[[SOCKET socket(int af, int type, int protocol);]]
function socket.create(af, type, protocol)
local fd = C.socket(af, type, protocol)
if fd <= 0 then
return nil, socket.lasterror()
end
return fd
end
end
generic_function("shutdown", "int shutdown(SOCKET s, int how);")
generic_function("setsockopt", "int setsockopt(SOCKET s, int level, int optname, const void* optval, uint32_t optlen);")
generic_function("getsockopt", "int getsockopt(SOCKET s, int level, int optname, void *optval, uint32_t *optlen);")
generic_function("accept", "SOCKET accept(SOCKET s, struct sockaddr *, int *);", nil, false)
generic_function("bind", "int bind(SOCKET s, const struct sockaddr* name, int namelen);")
generic_function("connect", "int connect(SOCKET s, const struct sockaddr * name, int namelen);")
generic_function("listen", "int listen(SOCKET s, int backlog);")
generic_function("recv", "int recv(SOCKET s, char* buf, int len, int flags);", nil, true)
generic_function("recvfrom", "int recvfrom(SOCKET s, char* buf, int len, int flags, struct sockaddr *src_addr, unsigned int *addrlen);", nil, true)
generic_function("send", "int send(SOCKET s, const char* buf, int len, int flags);", nil, true)
generic_function("sendto", "int sendto(SOCKET s, const char* buf, int len, int flags, const struct sockaddr* to, int tolen);", nil, true)
generic_function("getpeername", "int getpeername(SOCKET s, struct sockaddr *, unsigned int *);")
generic_function("getsockname", "int getsockname(SOCKET s, struct sockaddr *, unsigned int *);")
socket.inet_ntoa = C.inet_ntoa
socket.ntohs = C.ntohs
function socket.poll(fd, events, revents)
end
e = {
TCP_NODELAY = 1,
TCP_MAXSEG = 2,
TCP_CORK = 3,
TCP_KEEPIDLE = 4,
TCP_KEEPINTVL = 5,
TCP_KEEPCNT = 6,
TCP_SYNCNT = 7,
TCP_LINGER2 = 8,
TCP_DEFER_ACCEPT = 9,
TCP_WINDOW_CLAMP = 10,
TCP_INFO = 11,
TCP_QUICKACK = 12,
TCP_CONGESTION = 13,
TCP_MD5SIG = 14,
TCP_THIN_LINEAR_TIMEOUTS = 16,
TCP_THIN_DUPACK = 17,
TCP_USER_TIMEOUT = 18,
TCP_REPAIR = 19,
TCP_REPAIR_QUEUE = 20,
TCP_QUEUE_SEQ = 21,
TCP_REPAIR_OPTIONS = 22,
TCP_FASTOPEN = 23,
TCP_TIMESTAMP = 24,
TCP_NOTSENT_LOWAT = 25,
TCP_CC_INFO = 26,
TCP_SAVE_SYN = 27,
TCP_SAVED_SYN = 28,
TCP_REPAIR_WINDOW = 29,
TCP_FASTOPEN_CONNECT = 30,
TCP_ULP = 31,
TCP_MD5SIG_EXT = 32,
TCP_FASTOPEN_KEY = 33,
TCP_FASTOPEN_NO_COOKIE = 34,
TCP_ZEROCOPY_RECEIVE = 35,
TCP_INQ = 36,
AF_INET = 2,
AF_INET6 = 10,
AF_UNSPEC = 0,
AF_UNIX = 1,
AF_AX25 = 3,
AF_IPX = 4,
AF_APPLETALK = 5,
AF_NETROM = 6,
AF_BRIDGE = 7,
AF_AAL5 = 8,
AF_X25 = 9,
INET6_ADDRSTRLEN = 46,
INET_ADDRSTRLEN = 16,
SO_DEBUG = 1,
SO_REUSEADDR = 2,
SO_TYPE = 3,
SO_ERROR = 4,
SO_DONTROUTE = 5,
SO_BROADCAST = 6,
SO_SNDBUF = 7,
SO_RCVBUF = 8,
SO_SNDBUFFORCE = 32,
SO_RCVBUFFORCE = 33,
SO_KEEPALIVE = 9,
SO_OOBINLINE = 10,
SO_NO_CHECK = 11,
SO_PRIORITY = 12,
SO_LINGER = 13,
SO_BSDCOMPAT = 14,
SO_REUSEPORT = 15,
SO_PASSCRED = 16,
SO_PEERCRED = 17,
SO_RCVLOWAT = 18,
SO_SNDLOWAT = 19,
SO_RCVTIMEO = 20,
SO_SNDTIMEO = 21,
SO_SECURITY_AUTHENTICATION = 22,
SO_SECURITY_ENCRYPTION_TRANSPORT = 23,
SO_SECURITY_ENCRYPTION_NETWORK = 24,
SO_BINDTODEVICE = 25,
SO_ATTACH_FILTER = 26,
SO_DETACH_FILTER = 27,
SO_GET_FILTER = 26,
SO_PEERNAME = 28,
SO_TIMESTAMP = 29,
SO_ACCEPTCONN = 30,
SO_PEERSEC = 31,
SO_PASSSEC = 34,
SO_TIMESTAMPNS = 35,
SO_MARK = 36,
SO_TIMESTAMPING = 37,
SO_PROTOCOL = 38,
SO_DOMAIN = 39,
SO_RXQ_OVFL = 40,
SO_WIFI_STATUS = 41,
SO_PEEK_OFF = 42,
SO_NOFCS = 43,
SO_LOCK_FILTER = 44,
SO_SELECT_ERR_QUEUE = 45,
SO_BUSY_POLL = 46,
SO_MAX_PACING_RATE = 47,
SO_BPF_EXTENSIONS = 48,
SO_INCOMING_CPU = 49,
SO_ATTACH_BPF = 50,
SO_DETACH_BPF = 27,
SO_ATTACH_REUSEPORT_CBPF = 51,
SO_ATTACH_REUSEPORT_EBPF = 52,
SO_CNX_ADVICE = 53,
SO_MEMINFO = 55,
SO_INCOMING_NAPI_ID = 56,
SO_COOKIE = 57,
SO_PEERGROUPS = 59,
SO_ZEROCOPY = 60,
SO_TXTIME = 61,
SOL_SOCKET = 1,
SOL_TCP = 6,
SOMAXCONN = 128,
IPPROTO_IP = 0,
IPPROTO_HOPOPTS = 0,
IPPROTO_ICMP = 1,
IPPROTO_IGMP = 2,
IPPROTO_IPIP = 4,
IPPROTO_TCP = 6,
IPPROTO_EGP = 8,
IPPROTO_PUP = 12,
IPPROTO_UDP = 17,
IPPROTO_IDP = 22,
IPPROTO_TP = 29,
IPPROTO_DCCP = 33,
IPPROTO_IPV6 = 41,
IPPROTO_ROUTING = 43,
IPPROTO_FRAGMENT = 44,
IPPROTO_RSVP = 46,
IPPROTO_GRE = 47,
IPPROTO_ESP = 50,
IPPROTO_AH = 51,
IPPROTO_ICMPV6 = 58,
IPPROTO_NONE = 59,
IPPROTO_DSTOPTS = 60,
IPPROTO_MTP = 92,
IPPROTO_ENCAP = 98,
IPPROTO_PIM = 103,
IPPROTO_COMP = 108,
IPPROTO_SCTP = 132,
IPPROTO_UDPLITE = 136,
IPPROTO_RAW = 255,
SOCK_STREAM = 1,
SOCK_DGRAM = 2,
SOCK_RAW = 3,
SOCK_RDM = 4,
SOCK_SEQPACKET = 5,
SOCK_DCCP = 6,
SOCK_PACKET = 10,
SOCK_CLOEXEC = 02000000,
SOCK_NONBLOCK = 04000,
AI_PASSIVE = 0x00000001,
AI_CANONNAME = 0x00000002,
AI_NUMERICHOST = 0x00000004,
AI_NUMERICSERV = 0x00000008,
AI_ALL = 0x00000100,
AI_ADDRCONFIG = 0x00000400,
AI_V4MAPPED = 0x00000800,
AI_NON_AUTHORITATIVE = 0x00004000,
AI_SECURE = 0x00008000,
AI_RETURN_PREFERRED_NAMES = 0x00010000,
AI_FQDN = 0x00020000,
AI_FILESERVER = 0x00040000,
POLLIN = 0x0001,
POLLPRI = 0x0002,
POLLOUT = 0x0004,
POLLRDNORM = 0x0040,
POLLWRNORM = 0x0004,
POLLRDBAND = 0x0080,
POLLWRBAND = 0x0100,
POLLEXTEND = 0x0200,
POLLATTRIB = 0x0400,
POLLNLINK = 0x0800,
POLLWRITE = 0x1000,
POLLERR = 0x0008,
POLLHUP = 0x0010,
POLLNVAL = 0x0020,
MSG_OOB = 0x01,
MSG_PEEK = 0x02,
MSG_DONTROUTE = 0x04,
MSG_CTRUNC = 0x08,
MSG_PROXY = 0x10,
MSG_TRUNC = 0x20,
MSG_DONTWAIT = 0x40,
MSG_EOR = 0x80,
MSG_WAITALL = 0x100,
MSG_FIN = 0x200,
MSG_SYN = 0x400,
MSG_CONFIRM = 0x800,
MSG_RST = 0x1000,
MSG_ERRQUEUE = 0x2000,
MSG_NOSIGNAL = 0x4000,
MSG_MORE = 0x8000,
MSG_WAITFORONE = 0x10000,
MSG_CMSG_CLOEXEC = 0x40000000,
}
errno = {
EAGAIN = 11,
EWOULDBLOCK = 11, -- is errno.EAGAIN
EINVAL = 22,
ENOTSOCK = 88,
ECONNRESET = 104,
EINPROGRESS = 115,
}
if ffi.os == "Windows" then
e.SO_SNDLOWAT = 4099
e.SO_REUSEADDR = 4
e.SO_KEEPALIVE = 8
e.SOMAXCONN = 2147483647
e.AF_INET6 = 23
e.SO_RCVTIMEO = 4102
e.SOL_SOCKET = 65535
e.SO_LINGER = 128
e.SO_OOBINLINE = 256
e.POLLWRNORM = 16
e.SO_ERROR = 4103
e.SO_BROADCAST = 32
e.SO_ACCEPTCONN = 2
e.SO_RCVBUF = 4098
e.SO_SNDTIMEO = 4101
e.POLLIN = 768
e.POLLPRI = 1024
e.SO_TYPE = 4104
e.POLLRDBAND = 512
e.POLLWRBAND = 32
e.SO_SNDBUF = 4097
e.POLLNVAL = 4
e.POLLHUP = 2
e.POLLERR = 1
e.POLLRDNORM = 256
e.SO_DONTROUTE = 16
e.SO_RCVLOWAT = 4100
errno.EINVAL = 10022
errno.EAGAIN = 10035 -- Note: Does not exist on Windows
errno.EWOULDBLOCK = 10035
errno.EINPROGRESS = 10036
errno.ENOTSOCK = 10038
errno.ECONNRESET = 10054
end
if ffi.os == "OSX" then
e.SOL_SOCKET = 0xffff
e.SO_DEBUG = 0x0001
e.SO_ACCEPTCONN = 0x0002
e.SO_REUSEADDR = 0x0004
e.SO_KEEPALIVE = 0x0008
e.SO_DONTROUTE = 0x0010
e.SO_BROADCAST = 0x0020
errno.EINVAL = 22
errno.EAGAIN = 35
errno.EWOULDBLOCK = errno.EAGAIN
errno.EINPROGRESS = 36
errno.ENOTSOCK = 38
errno.ECONNRESET = 54
end
if socket.initialize then
assert(socket.initialize())
end
end
local function capture_flags(what)
local flags = {}
local reverse = {}
for k, v in pairs(e) do
if k:sub(0, #what) == what then
k = k:sub(#what + 1):lower()
reverse[v] = k
flags[k] = v
end
end
return {
lookup = flags,
reverse = reverse,
strict_reverse = function(key)
if not key then
error("invalid " .. what:sub(0, -2) .. " flag: nil")
end
if not reverse[key] then
error("invalid "..what:sub(0, -2).." flag: " .. key, 2)
end
return reverse[key]
end,
strict_lookup = function(key)
if not key then
error("invalid " .. what:sub(0, -2) .. " flag: nil")
end
if not flags[key] then
error("invalid "..what:sub(0, -2).." flag: " .. key, 2)
end
return flags[key]
end
}
end
local SOCK = capture_flags("SOCK_")
local AF = capture_flags("AF_")
local IPPROTO = capture_flags("IPPROTO_")
local AI = capture_flags("AI_")
local SOL = capture_flags("SOL_")
local SO = capture_flags("SO_")
local TCP = capture_flags("TCP_")
local POLL = capture_flags("POLL")
local function table_to_flags(flags, valid_flags, operation)
if type(flags) == "string" then
flags = {flags}
end
operation = operation or bit.band
local out = 0
for k, v in pairs(flags) do
local flag = valid_flags[v] or valid_flags[k]
if not flag then
error("invalid flag " .. tostring(v), 2)
end
out = operation(out, tonumber(flag))
end
return out
end
local function flags_to_table(flags, valid_flags, operation)
if not flags then return valid_flags.default_valid_flag end
operation = operation or bit.band
local out = {}
for k, v in pairs(valid_flags) do
if operation(flags, v) > 0 then
out[k] = true
end
end
return out
end
local M = {}
local timeout_messages = {}
timeout_messages[errno.EINPROGRESS] = true
timeout_messages[errno.EAGAIN] = true
timeout_messages[errno.EWOULDBLOCK] = true
function M.poll(socket, flags, timeout)
local pfd = ffi.new("struct pollfd[1]", {{
fd = socket.fd,
events = table_to_flags(flags, POLL.lookup, bit.bor),
revents = 0,
}})
local ok, err = socket.poll(pfd, 1, timeout or 0)
if not ok then return ok, err end
return flags_to_table(pfd[0].revents, POLL.lookup, bit.bor), ok
end
local function addrinfo_get_ip(self)
if self.addrinfo.ai_addr == nil then
return nil
end
local str = ffi.new("char[256]")
local addr = assert(socket.inet_ntop(AF.lookup[self.family], ffi.cast("struct sockaddr_in*", self.addrinfo.ai_addr).sin_addr, str, ffi.sizeof(str)))
return ffi.string(addr)
end
local function addrinfo_get_port(self)
if self.addrinfo.ai_addr == nil then
return nil
end
if self.family == "inet" then
return socket.ntohs(ffi.cast("struct sockaddr_in*", self.addrinfo.ai_addr).sin_port)
elseif self.family == "inet6" then
return socket.ntohs(ffi.cast("struct sockaddr_in6*", self.addrinfo.ai_addr).sin6_port)
end
return nil, "unknown family " .. tostring(self.family)
end
local function addrinfo_to_table(res, host, service)
local info = {}
if res.ai_canonname ~= nil then
info.canonical_name = ffi.string(res.ai_canonname)
end
info.host = host ~= "*" and host or nil
info.service = service
info.family = AF.reverse[res.ai_family]
info.socket_type = SOCK.reverse[res.ai_socktype]
info.protocol = IPPROTO.reverse[res.ai_protocol]
info.flags = flags_to_table(res.ai_flags, AI.lookup, bit.band)
info.addrinfo = res
info.get_ip = addrinfo_get_ip
info.get_port = addrinfo_get_port
return info
end
function M.get_address_info(data)
local hints
if data.socket_type or data.protocol or data.flags or data.family then
hints = ffi.new("struct addrinfo", {
ai_family = data.family and AF.strict_lookup(data.family) or nil,
ai_socktype = data.socket_type and SOCK.strict_lookup(data.socket_type) or nil,
ai_protocol = data.protocol and IPPROTO.strict_lookup(data.protocol) or nil,
ai_flags = data.flags and table_to_flags(data.flags, AI.lookup, bit.bor) or nil,
})
end
local out = ffi.new("struct addrinfo*[1]")
local ok, err = socket.getaddrinfo(
data.host ~= "*" and data.host or nil,
data.service and tostring(data.service) or nil,
hints,
out
)
if not ok then return ok, err end
local tbl = {}
local res = out[0]
while res ~= nil do
table.insert(tbl, addrinfo_to_table(res, data.host, data.service))
res = res.ai_next
end
--ffi.C.freeaddrinfo(out[0])
return tbl
end
function M.find_first_address(host, service, options)
options = options or {}
local info = {}
info.host = host
info.service = service
info.family = options.family or "inet"
info.socket_type = options.socket_type or "stream"
info.protocol = options.protocol or "tcp"
info.flags = options.flags
if host == "*" then
info.flags = info.flags or {}
table.insert(info.flags, "passive")
end
local addrinfo, err = M.get_address_info(info)
if not addrinfo then
return nil, err
end
if not addrinfo[1] then
return nil, "no addresses found (empty address info table)"
end
for _, v in ipairs(addrinfo) do
if v.family == info.family and v.socket_type == info.socket_type and v.protocol == info.protocol then
return v
end
end
return addrinfo[1]
end
do
local meta = {}
meta.__index = meta
function meta:__tostring()
return string.format("socket[%s-%s-%s][%s]", self.family, self.socket_type, self.protocol, self.fd)
end
function M.create(family, socket_type, protocol)
local fd, err, num = socket.create(AF.strict_lookup(family), SOCK.strict_lookup(socket_type), IPPROTO.strict_lookup(protocol))
if not fd then return fd, err, num end
return setmetatable({
fd = fd,
family = family,
socket_type = socket_type,
protocol = protocol,
blocking = true,
}, meta)
end
function meta:close()
if self.on_close then
self:on_close()
end
return socket.close(self.fd)
end
function meta:set_blocking(b)
local ok, err, num = socket.blocking(self.fd, b)