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# frozen_string_literal: true
require 'socket.so'
require 'io/wait'
class Addrinfo
# creates an Addrinfo object from the arguments.
#
# The arguments are interpreted as similar to self.
#
# Addrinfo.tcp("0.0.0.0", 4649).family_addrinfo("www.ruby-lang.org", 80)
# #=> #<Addrinfo: 221.186.184.68:80 TCP (www.ruby-lang.org:80)>
#
# Addrinfo.unix("/tmp/sock").family_addrinfo("/tmp/sock2")
# #=> #<Addrinfo: /tmp/sock2 SOCK_STREAM>
#
def family_addrinfo(*args)
if args.empty?
raise ArgumentError, "no address specified"
elsif Addrinfo === args.first
raise ArgumentError, "too many arguments" if args.length != 1
addrinfo = args.first
if (self.pfamily != addrinfo.pfamily) ||
(self.socktype != addrinfo.socktype)
raise ArgumentError, "Addrinfo type mismatch"
end
addrinfo
elsif self.ip?
raise ArgumentError, "IP address needs host and port but #{args.length} arguments given" if args.length != 2
host, port = args
Addrinfo.getaddrinfo(host, port, self.pfamily, self.socktype, self.protocol)[0]
elsif self.unix?
raise ArgumentError, "UNIX socket needs single path argument but #{args.length} arguments given" if args.length != 1
path, = args
Addrinfo.unix(path)
else
raise ArgumentError, "unexpected family"
end
end
# creates a new Socket connected to the address of +local_addrinfo+.
#
# If _local_addrinfo_ is nil, the address of the socket is not bound.
#
# The _timeout_ specify the seconds for timeout.
# Errno::ETIMEDOUT is raised when timeout occur.
#
# If a block is given the created socket is yielded for each address.
#
def connect_internal(local_addrinfo, timeout=nil) # :yields: socket
sock = Socket.new(self.pfamily, self.socktype, self.protocol)
begin
sock.ipv6only! if self.ipv6?
sock.bind local_addrinfo if local_addrinfo
if timeout
case sock.connect_nonblock(self, exception: false)
when 0 # success or EISCONN, other errors raise
break
when :wait_writable
sock.wait_writable(timeout) or
raise Errno::ETIMEDOUT, 'user specified timeout'
end while true
else
sock.connect(self)
end
rescue Exception
sock.close
raise
end
if block_given?
begin
yield sock
ensure
sock.close
end
else
sock
end
end
protected :connect_internal
# :call-seq:
# addrinfo.connect_from([local_addr_args], [opts]) {|socket| ... }
# addrinfo.connect_from([local_addr_args], [opts])
#
# creates a socket connected to the address of self.
#
# If one or more arguments given as _local_addr_args_,
# it is used as the local address of the socket.
# _local_addr_args_ is given for family_addrinfo to obtain actual address.
#
# If _local_addr_args_ is not given, the local address of the socket is not bound.
#
# The optional last argument _opts_ is options represented by a hash.
# _opts_ may have following options:
#
# [:timeout] specify the timeout in seconds.
#
# If a block is given, it is called with the socket and the value of the block is returned.
# The socket is returned otherwise.
#
# Addrinfo.tcp("www.ruby-lang.org", 80).connect_from("0.0.0.0", 4649) {|s|
# s.print "GET / HTTP/1.0\r\nHost: www.ruby-lang.org\r\n\r\n"
# puts s.read
# }
#
# # Addrinfo object can be taken for the argument.
# Addrinfo.tcp("www.ruby-lang.org", 80).connect_from(Addrinfo.tcp("0.0.0.0", 4649)) {|s|
# s.print "GET / HTTP/1.0\r\nHost: www.ruby-lang.org\r\n\r\n"
# puts s.read
# }
#
def connect_from(*args, timeout: nil, &block)
connect_internal(family_addrinfo(*args), timeout, &block)
end
# :call-seq:
# addrinfo.connect([opts]) {|socket| ... }
# addrinfo.connect([opts])
#
# creates a socket connected to the address of self.
#
# The optional argument _opts_ is options represented by a hash.
# _opts_ may have following options:
#
# [:timeout] specify the timeout in seconds.
#
# If a block is given, it is called with the socket and the value of the block is returned.
# The socket is returned otherwise.
#
# Addrinfo.tcp("www.ruby-lang.org", 80).connect {|s|
# s.print "GET / HTTP/1.0\r\nHost: www.ruby-lang.org\r\n\r\n"
# puts s.read
# }
#
def connect(timeout: nil, &block)
connect_internal(nil, timeout, &block)
end
# :call-seq:
# addrinfo.connect_to([remote_addr_args], [opts]) {|socket| ... }
# addrinfo.connect_to([remote_addr_args], [opts])
#
# creates a socket connected to _remote_addr_args_ and bound to self.
#
# The optional last argument _opts_ is options represented by a hash.
# _opts_ may have following options:
#
# [:timeout] specify the timeout in seconds.
#
# If a block is given, it is called with the socket and the value of the block is returned.
# The socket is returned otherwise.
#
# Addrinfo.tcp("0.0.0.0", 4649).connect_to("www.ruby-lang.org", 80) {|s|
# s.print "GET / HTTP/1.0\r\nHost: www.ruby-lang.org\r\n\r\n"
# puts s.read
# }
#
def connect_to(*args, timeout: nil, &block)
remote_addrinfo = family_addrinfo(*args)
remote_addrinfo.connect_internal(self, timeout, &block)
end
# creates a socket bound to self.
#
# If a block is given, it is called with the socket and the value of the block is returned.
# The socket is returned otherwise.
#
# Addrinfo.udp("0.0.0.0", 9981).bind {|s|
# s.local_address.connect {|s| s.send "hello", 0 }
# p s.recv(10) #=> "hello"
# }
#
def bind
sock = Socket.new(self.pfamily, self.socktype, self.protocol)
begin
sock.ipv6only! if self.ipv6?
sock.setsockopt(:SOCKET, :REUSEADDR, 1)
sock.bind(self)
rescue Exception
sock.close
raise
end
if block_given?
begin
yield sock
ensure
sock.close
end
else
sock
end
end
# creates a listening socket bound to self.
def listen(backlog=Socket::SOMAXCONN)
sock = Socket.new(self.pfamily, self.socktype, self.protocol)
begin
sock.ipv6only! if self.ipv6?
sock.setsockopt(:SOCKET, :REUSEADDR, 1)
sock.bind(self)
sock.listen(backlog)
rescue Exception
sock.close
raise
end
if block_given?
begin
yield sock
ensure
sock.close
end
else
sock
end
end
# iterates over the list of Addrinfo objects obtained by Addrinfo.getaddrinfo.
#
# Addrinfo.foreach(nil, 80) {|x| p x }
# #=> #<Addrinfo: 127.0.0.1:80 TCP (:80)>
# # #<Addrinfo: 127.0.0.1:80 UDP (:80)>
# # #<Addrinfo: [::1]:80 TCP (:80)>
# # #<Addrinfo: [::1]:80 UDP (:80)>
#
def self.foreach(nodename, service, family=nil, socktype=nil, protocol=nil, flags=nil, timeout: nil, &block)
Addrinfo.getaddrinfo(nodename, service, family, socktype, protocol, flags, timeout: timeout).each(&block)
end
end
class BasicSocket < IO
# Returns an address of the socket suitable for connect in the local machine.
#
# This method returns _self_.local_address, except following condition.
#
# - IPv4 unspecified address (0.0.0.0) is replaced by IPv4 loopback address (127.0.0.1).
# - IPv6 unspecified address (::) is replaced by IPv6 loopback address (::1).
#
# If the local address is not suitable for connect, SocketError is raised.
# IPv4 and IPv6 address which port is 0 is not suitable for connect.
# Unix domain socket which has no path is not suitable for connect.
#
# Addrinfo.tcp("0.0.0.0", 0).listen {|serv|
# p serv.connect_address #=> #<Addrinfo: 127.0.0.1:53660 TCP>
# serv.connect_address.connect {|c|
# s, _ = serv.accept
# p [c, s] #=> [#<Socket:fd 4>, #<Socket:fd 6>]
# }
# }
#
def connect_address
addr = local_address
afamily = addr.afamily
if afamily == Socket::AF_INET
raise SocketError, "unbound IPv4 socket" if addr.ip_port == 0
if addr.ip_address == "0.0.0.0"
addr = Addrinfo.new(["AF_INET", addr.ip_port, nil, "127.0.0.1"], addr.pfamily, addr.socktype, addr.protocol)
end
elsif defined?(Socket::AF_INET6) && afamily == Socket::AF_INET6
raise SocketError, "unbound IPv6 socket" if addr.ip_port == 0
if addr.ip_address == "::"
addr = Addrinfo.new(["AF_INET6", addr.ip_port, nil, "::1"], addr.pfamily, addr.socktype, addr.protocol)
elsif addr.ip_address == "0.0.0.0" # MacOS X 10.4 returns "a.b.c.d" for IPv4-mapped IPv6 address.
addr = Addrinfo.new(["AF_INET6", addr.ip_port, nil, "::1"], addr.pfamily, addr.socktype, addr.protocol)
elsif addr.ip_address == "::ffff:0.0.0.0" # MacOS X 10.6 returns "::ffff:a.b.c.d" for IPv4-mapped IPv6 address.
addr = Addrinfo.new(["AF_INET6", addr.ip_port, nil, "::1"], addr.pfamily, addr.socktype, addr.protocol)
end
elsif defined?(Socket::AF_UNIX) && afamily == Socket::AF_UNIX
raise SocketError, "unbound Unix socket" if addr.unix_path == ""
end
addr
end
# call-seq:
# basicsocket.sendmsg(mesg, flags=0, dest_sockaddr=nil, *controls) => numbytes_sent
#
# sendmsg sends a message using sendmsg(2) system call in blocking manner.
#
# _mesg_ is a string to send.
#
# _flags_ is bitwise OR of MSG_* constants such as Socket::MSG_OOB.
#
# _dest_sockaddr_ is a destination socket address for connection-less socket.
# It should be a sockaddr such as a result of Socket.sockaddr_in.
# An Addrinfo object can be used too.
#
# _controls_ is a list of ancillary data.
# The element of _controls_ should be Socket::AncillaryData or
# 3-elements array.
# The 3-element array should contains cmsg_level, cmsg_type and data.
#
# The return value, _numbytes_sent_ is an integer which is the number of bytes sent.
#
# sendmsg can be used to implement send_io as follows:
#
# # use Socket::AncillaryData.
# ancdata = Socket::AncillaryData.int(:UNIX, :SOCKET, :RIGHTS, io.fileno)
# sock.sendmsg("a", 0, nil, ancdata)
#
# # use 3-element array.
# ancdata = [:SOCKET, :RIGHTS, [io.fileno].pack("i!")]
# sock.sendmsg("\0", 0, nil, ancdata)
def sendmsg(mesg, flags = 0, dest_sockaddr = nil, *controls)
__sendmsg(mesg, flags, dest_sockaddr, controls)
end
# call-seq:
# basicsocket.sendmsg_nonblock(mesg, flags=0, dest_sockaddr=nil, *controls, opts={}) => numbytes_sent
#
# sendmsg_nonblock sends a message using sendmsg(2) system call in non-blocking manner.
#
# It is similar to BasicSocket#sendmsg
# but the non-blocking flag is set before the system call
# and it doesn't retry the system call.
#
# By specifying a keyword argument _exception_ to +false+, you can indicate
# that sendmsg_nonblock should not raise an IO::WaitWritable exception, but
# return the symbol +:wait_writable+ instead.
def sendmsg_nonblock(mesg, flags = 0, dest_sockaddr = nil, *controls,
exception: true)
__sendmsg_nonblock(mesg, flags, dest_sockaddr, controls, exception)
end
# call-seq:
# basicsocket.recv_nonblock(maxlen [, flags [, buf [, options ]]]) => mesg
#
# Receives up to _maxlen_ bytes from +socket+ using recvfrom(2) after
# O_NONBLOCK is set for the underlying file descriptor.
# _flags_ is zero or more of the +MSG_+ options.
# The result, _mesg_, is the data received.
#
# When recvfrom(2) returns 0, Socket#recv_nonblock returns
# an empty string as data.
# The meaning depends on the socket: EOF on TCP, empty packet on UDP, etc.
#
# === Parameters
# * +maxlen+ - the number of bytes to receive from the socket
# * +flags+ - zero or more of the +MSG_+ options
# * +buf+ - destination String buffer
# * +options+ - keyword hash, supporting `exception: false`
#
# === Example
# serv = TCPServer.new("127.0.0.1", 0)
# af, port, host, addr = serv.addr
# c = TCPSocket.new(addr, port)
# s = serv.accept
# c.send "aaa", 0
# begin # emulate blocking recv.
# p s.recv_nonblock(10) #=> "aaa"
# rescue IO::WaitReadable
# IO.select([s])
# retry
# end
#
# Refer to Socket#recvfrom for the exceptions that may be thrown if the call
# to _recv_nonblock_ fails.
#
# BasicSocket#recv_nonblock may raise any error corresponding to recvfrom(2) failure,
# including Errno::EWOULDBLOCK.
#
# If the exception is Errno::EWOULDBLOCK or Errno::EAGAIN,
# it is extended by IO::WaitReadable.
# So IO::WaitReadable can be used to rescue the exceptions for retrying recv_nonblock.
#
# By specifying a keyword argument _exception_ to +false+, you can indicate
# that recv_nonblock should not raise an IO::WaitReadable exception, but
# return the symbol +:wait_readable+ instead.
#
# === See
# * Socket#recvfrom
def recv_nonblock(len, flag = 0, str = nil, exception: true)
__recv_nonblock(len, flag, str, exception)
end
# call-seq:
# basicsocket.recvmsg(maxmesglen=nil, flags=0, maxcontrollen=nil, opts={}) => [mesg, sender_addrinfo, rflags, *controls]
#
# recvmsg receives a message using recvmsg(2) system call in blocking manner.
#
# _maxmesglen_ is the maximum length of mesg to receive.
#
# _flags_ is bitwise OR of MSG_* constants such as Socket::MSG_PEEK.
#
# _maxcontrollen_ is the maximum length of controls (ancillary data) to receive.
#
# _opts_ is option hash.
# Currently :scm_rights=>bool is the only option.
#
# :scm_rights option specifies that application expects SCM_RIGHTS control message.
# If the value is nil or false, application don't expects SCM_RIGHTS control message.
# In this case, recvmsg closes the passed file descriptors immediately.
# This is the default behavior.
#
# If :scm_rights value is neither nil nor false, application expects SCM_RIGHTS control message.
# In this case, recvmsg creates IO objects for each file descriptors for
# Socket::AncillaryData#unix_rights method.
#
# The return value is 4-elements array.
#
# _mesg_ is a string of the received message.
#
# _sender_addrinfo_ is a sender socket address for connection-less socket.
# It is an Addrinfo object.
# For connection-oriented socket such as TCP, sender_addrinfo is platform dependent.
#
# _rflags_ is a flags on the received message which is bitwise OR of MSG_* constants such as Socket::MSG_TRUNC.
# It will be nil if the system uses 4.3BSD style old recvmsg system call.
#
# _controls_ is ancillary data which is an array of Socket::AncillaryData objects such as:
#
# #<Socket::AncillaryData: AF_UNIX SOCKET RIGHTS 7>
#
# _maxmesglen_ and _maxcontrollen_ can be nil.
# In that case, the buffer will be grown until the message is not truncated.
# Internally, MSG_PEEK is used.
# Buffer full and MSG_CTRUNC are checked for truncation.
#
# recvmsg can be used to implement recv_io as follows:
#
# mesg, sender_sockaddr, rflags, *controls = sock.recvmsg(:scm_rights=>true)
# controls.each {|ancdata|
# if ancdata.cmsg_is?(:SOCKET, :RIGHTS)
# return ancdata.unix_rights[0]
# end
# }
def recvmsg(dlen = nil, flags = 0, clen = nil, scm_rights: false)
__recvmsg(dlen, flags, clen, scm_rights)
end
# call-seq:
# basicsocket.recvmsg_nonblock(maxdatalen=nil, flags=0, maxcontrollen=nil, opts={}) => [data, sender_addrinfo, rflags, *controls]
#
# recvmsg receives a message using recvmsg(2) system call in non-blocking manner.
#
# It is similar to BasicSocket#recvmsg
# but non-blocking flag is set before the system call
# and it doesn't retry the system call.
#
# By specifying a keyword argument _exception_ to +false+, you can indicate
# that recvmsg_nonblock should not raise an IO::WaitReadable exception, but
# return the symbol +:wait_readable+ instead.
def recvmsg_nonblock(dlen = nil, flags = 0, clen = nil,
scm_rights: false, exception: true)
__recvmsg_nonblock(dlen, flags, clen, scm_rights, exception)
end
# Linux-specific optimizations to avoid fcntl for IO#read_nonblock
# and IO#write_nonblock using MSG_DONTWAIT
# Do other platforms support MSG_DONTWAIT reliably?
if RUBY_PLATFORM =~ /linux/ && Socket.const_defined?(:MSG_DONTWAIT)
def read_nonblock(len, str = nil, exception: true) # :nodoc:
__read_nonblock(len, str, exception)
end
def write_nonblock(buf, exception: true) # :nodoc:
__write_nonblock(buf, exception)
end
end
end
class Socket < BasicSocket
# enable the socket option IPV6_V6ONLY if IPV6_V6ONLY is available.
def ipv6only!
if defined? Socket::IPV6_V6ONLY
self.setsockopt(:IPV6, :V6ONLY, 1)
end
end
# call-seq:
# socket.recvfrom_nonblock(maxlen[, flags[, outbuf[, opts]]]) => [mesg, sender_addrinfo]
#
# Receives up to _maxlen_ bytes from +socket+ using recvfrom(2) after
# O_NONBLOCK is set for the underlying file descriptor.
# _flags_ is zero or more of the +MSG_+ options.
# The first element of the results, _mesg_, is the data received.
# The second element, _sender_addrinfo_, contains protocol-specific address
# information of the sender.
#
# When recvfrom(2) returns 0, Socket#recvfrom_nonblock returns
# an empty string as data.
# The meaning depends on the socket: EOF on TCP, empty packet on UDP, etc.
#
# === Parameters
# * +maxlen+ - the maximum number of bytes to receive from the socket
# * +flags+ - zero or more of the +MSG_+ options
# * +outbuf+ - destination String buffer
# * +opts+ - keyword hash, supporting `exception: false`
#
# === Example
# # In one file, start this first
# require 'socket'
# include Socket::Constants
# socket = Socket.new(AF_INET, SOCK_STREAM, 0)
# sockaddr = Socket.sockaddr_in(2200, 'localhost')
# socket.bind(sockaddr)
# socket.listen(5)
# client, client_addrinfo = socket.accept
# begin # emulate blocking recvfrom
# pair = client.recvfrom_nonblock(20)
# rescue IO::WaitReadable
# IO.select([client])
# retry
# end
# data = pair[0].chomp
# puts "I only received 20 bytes '#{data}'"
# sleep 1
# socket.close
#
# # In another file, start this second
# require 'socket'
# include Socket::Constants
# socket = Socket.new(AF_INET, SOCK_STREAM, 0)
# sockaddr = Socket.sockaddr_in(2200, 'localhost')
# socket.connect(sockaddr)
# socket.puts "Watch this get cut short!"
# socket.close
#
# Refer to Socket#recvfrom for the exceptions that may be thrown if the call
# to _recvfrom_nonblock_ fails.
#
# Socket#recvfrom_nonblock may raise any error corresponding to recvfrom(2) failure,
# including Errno::EWOULDBLOCK.
#
# If the exception is Errno::EWOULDBLOCK or Errno::EAGAIN,
# it is extended by IO::WaitReadable.
# So IO::WaitReadable can be used to rescue the exceptions for retrying
# recvfrom_nonblock.
#
# By specifying a keyword argument _exception_ to +false+, you can indicate
# that recvfrom_nonblock should not raise an IO::WaitReadable exception, but
# return the symbol +:wait_readable+ instead.
#
# === See
# * Socket#recvfrom
def recvfrom_nonblock(len, flag = 0, str = nil, exception: true)
__recvfrom_nonblock(len, flag, str, exception)
end
# call-seq:
# socket.accept_nonblock([options]) => [client_socket, client_addrinfo]
#
# Accepts an incoming connection using accept(2) after
# O_NONBLOCK is set for the underlying file descriptor.
# It returns an array containing the accepted socket
# for the incoming connection, _client_socket_,
# and an Addrinfo, _client_addrinfo_.
#
# === Example
# # In one script, start this first
# require 'socket'
# include Socket::Constants
# socket = Socket.new(AF_INET, SOCK_STREAM, 0)
# sockaddr = Socket.sockaddr_in(2200, 'localhost')
# socket.bind(sockaddr)
# socket.listen(5)
# begin # emulate blocking accept
# client_socket, client_addrinfo = socket.accept_nonblock
# rescue IO::WaitReadable, Errno::EINTR
# IO.select([socket])
# retry
# end
# puts "The client said, '#{client_socket.readline.chomp}'"
# client_socket.puts "Hello from script one!"
# socket.close
#
# # In another script, start this second
# require 'socket'
# include Socket::Constants
# socket = Socket.new(AF_INET, SOCK_STREAM, 0)
# sockaddr = Socket.sockaddr_in(2200, 'localhost')
# socket.connect(sockaddr)
# socket.puts "Hello from script 2."
# puts "The server said, '#{socket.readline.chomp}'"
# socket.close
#
# Refer to Socket#accept for the exceptions that may be thrown if the call
# to _accept_nonblock_ fails.
#
# Socket#accept_nonblock may raise any error corresponding to accept(2) failure,
# including Errno::EWOULDBLOCK.
#
# If the exception is Errno::EWOULDBLOCK, Errno::EAGAIN, Errno::ECONNABORTED or Errno::EPROTO,
# it is extended by IO::WaitReadable.
# So IO::WaitReadable can be used to rescue the exceptions for retrying accept_nonblock.
#
# By specifying a keyword argument _exception_ to +false+, you can indicate
# that accept_nonblock should not raise an IO::WaitReadable exception, but
# return the symbol +:wait_readable+ instead.
#
# === See
# * Socket#accept
def accept_nonblock(exception: true)
__accept_nonblock(exception)
end
# :call-seq:
# Socket.tcp(host, port, local_host=nil, local_port=nil, [opts]) {|socket| ... }
# Socket.tcp(host, port, local_host=nil, local_port=nil, [opts])
#
# creates a new socket object connected to host:port using TCP/IP.
#
# If local_host:local_port is given,
# the socket is bound to it.
#
# The optional last argument _opts_ is options represented by a hash.
# _opts_ may have following options:
#
# [:connect_timeout] specify the timeout in seconds.
# [:resolv_timeout] specify the name resolution timeout in seconds.
#
# If a block is given, the block is called with the socket.
# The value of the block is returned.
# The socket is closed when this method returns.
#
# If no block is given, the socket is returned.
#
# Socket.tcp("www.ruby-lang.org", 80) {|sock|
# sock.print "GET / HTTP/1.0\r\nHost: www.ruby-lang.org\r\n\r\n"
# sock.close_write
# puts sock.read
# }
#
def self.tcp(host, port, local_host = nil, local_port = nil, connect_timeout: nil, resolv_timeout: nil) # :yield: socket
last_error = nil
ret = nil
local_addr_list = nil
if local_host != nil || local_port != nil
local_addr_list = Addrinfo.getaddrinfo(local_host, local_port, nil, :STREAM, nil)
end
Addrinfo.foreach(host, port, nil, :STREAM, timeout: resolv_timeout) {|ai|
if local_addr_list
local_addr = local_addr_list.find {|local_ai| local_ai.afamily == ai.afamily }
next unless local_addr
else
local_addr = nil
end
begin
sock = local_addr ?
ai.connect_from(local_addr, timeout: connect_timeout) :
ai.connect(timeout: connect_timeout)
rescue SystemCallError
last_error = $!
next
end
ret = sock
break
}
unless ret
if last_error
raise last_error
else
raise SocketError, "no appropriate local address"
end
end
if block_given?
begin
yield ret
ensure
ret.close
end
else
ret
end
end
# :stopdoc:
def self.ip_sockets_port0(ai_list, reuseaddr)
sockets = []
begin
sockets.clear
port = nil
ai_list.each {|ai|
begin
s = Socket.new(ai.pfamily, ai.socktype, ai.protocol)
rescue SystemCallError
next
end
sockets << s
s.ipv6only! if ai.ipv6?
if reuseaddr
s.setsockopt(:SOCKET, :REUSEADDR, 1)
end
unless port
s.bind(ai)
port = s.local_address.ip_port
else
s.bind(ai.family_addrinfo(ai.ip_address, port))
end
}
rescue Errno::EADDRINUSE
sockets.each(&:close)
retry
rescue Exception
sockets.each(&:close)
raise
end
sockets
end
class << self
private :ip_sockets_port0
end
def self.tcp_server_sockets_port0(host)
ai_list = Addrinfo.getaddrinfo(host, 0, nil, :STREAM, nil, Socket::AI_PASSIVE)
sockets = ip_sockets_port0(ai_list, true)
begin
sockets.each {|s|
s.listen(Socket::SOMAXCONN)
}
rescue Exception
sockets.each(&:close)
raise
end
sockets
end
class << self
private :tcp_server_sockets_port0
end
# :startdoc:
# creates TCP/IP server sockets for _host_ and _port_.
# _host_ is optional.
#
# If no block given,
# it returns an array of listening sockets.
#
# If a block is given, the block is called with the sockets.
# The value of the block is returned.
# The socket is closed when this method returns.
#
# If _port_ is 0, actual port number is chosen dynamically.
# However all sockets in the result has same port number.
#
# # tcp_server_sockets returns two sockets.
# sockets = Socket.tcp_server_sockets(1296)
# p sockets #=> [#<Socket:fd 3>, #<Socket:fd 4>]
#
# # The sockets contains IPv6 and IPv4 sockets.
# sockets.each {|s| p s.local_address }
# #=> #<Addrinfo: [::]:1296 TCP>
# # #<Addrinfo: 0.0.0.0:1296 TCP>
#
# # IPv6 and IPv4 socket has same port number, 53114, even if it is chosen dynamically.
# sockets = Socket.tcp_server_sockets(0)
# sockets.each {|s| p s.local_address }
# #=> #<Addrinfo: [::]:53114 TCP>
# # #<Addrinfo: 0.0.0.0:53114 TCP>
#
# # The block is called with the sockets.
# Socket.tcp_server_sockets(0) {|sockets|
# p sockets #=> [#<Socket:fd 3>, #<Socket:fd 4>]
# }
#
def self.tcp_server_sockets(host=nil, port)
if port == 0
sockets = tcp_server_sockets_port0(host)
else
last_error = nil
sockets = []
begin
Addrinfo.foreach(host, port, nil, :STREAM, nil, Socket::AI_PASSIVE) {|ai|
begin
s = ai.listen
rescue SystemCallError
last_error = $!
next
end
sockets << s
}
if sockets.empty?
raise last_error
end
rescue Exception
sockets.each(&:close)
raise
end
end
if block_given?
begin
yield sockets
ensure
sockets.each(&:close)
end
else
sockets
end
end
# yield socket and client address for each a connection accepted via given sockets.
#
# The arguments are a list of sockets.
# The individual argument should be a socket or an array of sockets.
#
# This method yields the block sequentially.
# It means that the next connection is not accepted until the block returns.
# So concurrent mechanism, thread for example, should be used to service multiple clients at a time.
#
def self.accept_loop(*sockets) # :yield: socket, client_addrinfo
sockets.flatten!(1)
if sockets.empty?
raise ArgumentError, "no sockets"
end
loop {
readable, _, _ = IO.select(sockets)
readable.each {|r|
sock, addr = r.accept_nonblock(exception: false)
next if sock == :wait_readable
yield sock, addr
}
}
end
# creates a TCP/IP server on _port_ and calls the block for each connection accepted.
# The block is called with a socket and a client_address as an Addrinfo object.
#
# If _host_ is specified, it is used with _port_ to determine the server addresses.
#
# The socket is *not* closed when the block returns.
# So application should close it explicitly.
#
# This method calls the block sequentially.
# It means that the next connection is not accepted until the block returns.
# So concurrent mechanism, thread for example, should be used to service multiple clients at a time.
#
# Note that Addrinfo.getaddrinfo is used to determine the server socket addresses.
# When Addrinfo.getaddrinfo returns two or more addresses,
# IPv4 and IPv6 address for example,
# all of them are used.
# Socket.tcp_server_loop succeeds if one socket can be used at least.
#
# # Sequential echo server.
# # It services only one client at a time.
# Socket.tcp_server_loop(16807) {|sock, client_addrinfo|
# begin
# IO.copy_stream(sock, sock)
# ensure
# sock.close
# end
# }
#
# # Threaded echo server
# # It services multiple clients at a time.
# # Note that it may accept connections too much.
# Socket.tcp_server_loop(16807) {|sock, client_addrinfo|
# Thread.new {
# begin
# IO.copy_stream(sock, sock)
# ensure
# sock.close
# end
# }
# }
#
def self.tcp_server_loop(host=nil, port, &b) # :yield: socket, client_addrinfo
tcp_server_sockets(host, port) {|sockets|
accept_loop(sockets, &b)
}
end
# :call-seq:
# Socket.udp_server_sockets([host, ] port)
#
# Creates UDP/IP sockets for a UDP server.
#
# If no block given, it returns an array of sockets.
#
# If a block is given, the block is called with the sockets.
# The value of the block is returned.
# The sockets are closed when this method returns.
#
# If _port_ is zero, some port is chosen.
# But the chosen port is used for the all sockets.
#
# # UDP/IP echo server
# Socket.udp_server_sockets(0) {|sockets|
# p sockets.first.local_address.ip_port #=> 32963
# Socket.udp_server_loop_on(sockets) {|msg, msg_src|
# msg_src.reply msg
# }
# }
#
def self.udp_server_sockets(host=nil, port)
last_error = nil
sockets = []
ipv6_recvpktinfo = nil
if defined? Socket::AncillaryData
if defined? Socket::IPV6_RECVPKTINFO # RFC 3542
ipv6_recvpktinfo = Socket::IPV6_RECVPKTINFO
elsif defined? Socket::IPV6_PKTINFO # RFC 2292
ipv6_recvpktinfo = Socket::IPV6_PKTINFO
end
end
local_addrs = Socket.ip_address_list
ip_list = []
Addrinfo.foreach(host, port, nil, :DGRAM, nil, Socket::AI_PASSIVE) {|ai|
if ai.ipv4? && ai.ip_address == "0.0.0.0"
local_addrs.each {|a|
next unless a.ipv4?
ip_list << Addrinfo.new(a.to_sockaddr, :INET, :DGRAM, 0);
}
elsif ai.ipv6? && ai.ip_address == "::" && !ipv6_recvpktinfo
local_addrs.each {|a|
next unless a.ipv6?
ip_list << Addrinfo.new(a.to_sockaddr, :INET6, :DGRAM, 0);
}
else
ip_list << ai
end
}
ip_list.uniq!(&:to_sockaddr)
if port == 0
sockets = ip_sockets_port0(ip_list, false)
else
ip_list.each {|ip|
ai = Addrinfo.udp(ip.ip_address, port)
begin
s = ai.bind
rescue SystemCallError
last_error = $!
next
end
sockets << s
}
if sockets.empty?
raise last_error
end
end
sockets.each {|s|
ai = s.local_address
if ipv6_recvpktinfo && ai.ipv6? && ai.ip_address == "::"
s.setsockopt(:IPV6, ipv6_recvpktinfo, 1)
end
}
if block_given?
begin
yield sockets
ensure
sockets.each(&:close) if sockets
end
else
sockets
end
end
# :call-seq:
# Socket.udp_server_recv(sockets) {|msg, msg_src| ... }
#
# Receive UDP/IP packets from the given _sockets_.
# For each packet received, the block is called.
#
# The block receives _msg_ and _msg_src_.
# _msg_ is a string which is the payload of the received packet.
# _msg_src_ is a Socket::UDPSource object which is used for reply.
#
# Socket.udp_server_loop can be implemented using this method as follows.
#
# udp_server_sockets(host, port) {|sockets|
# loop {
# readable, _, _ = IO.select(sockets)
# udp_server_recv(readable) {|msg, msg_src| ... }
# }
# }
#
def self.udp_server_recv(sockets)
sockets.each {|r|
msg, sender_addrinfo, _, *controls = r.recvmsg_nonblock(exception: false)
next if msg == :wait_readable
ai = r.local_address
if ai.ipv6? and pktinfo = controls.find {|c| c.cmsg_is?(:IPV6, :PKTINFO) }
ai = Addrinfo.udp(pktinfo.ipv6_pktinfo_addr.ip_address, ai.ip_port)
yield msg, UDPSource.new(sender_addrinfo, ai) {|reply_msg|
r.sendmsg reply_msg, 0, sender_addrinfo, pktinfo
}
else
yield msg, UDPSource.new(sender_addrinfo, ai) {|reply_msg|
r.send reply_msg, 0, sender_addrinfo
}
end
}
end
# :call-seq:
# Socket.udp_server_loop_on(sockets) {|msg, msg_src| ... }
#
# Run UDP/IP server loop on the given sockets.
#
# The return value of Socket.udp_server_sockets is appropriate for the argument.
#
# It calls the block for each message received.
#
def self.udp_server_loop_on(sockets, &b) # :yield: msg, msg_src
loop {
readable, _, _ = IO.select(sockets)
udp_server_recv(readable, &b)
}
end
# :call-seq:
# Socket.udp_server_loop(port) {|msg, msg_src| ... }
# Socket.udp_server_loop(host, port) {|msg, msg_src| ... }
#
# creates a UDP/IP server on _port_ and calls the block for each message arrived.
# The block is called with the message and its source information.
#
# This method allocates sockets internally using _port_.
# If _host_ is specified, it is used conjunction with _port_ to determine the server addresses.
#
# The _msg_ is a string.
#
# The _msg_src_ is a Socket::UDPSource object.
# It is used for reply.
#
# # UDP/IP echo server.
# Socket.udp_server_loop(9261) {|msg, msg_src|
# msg_src.reply msg
# }
#
def self.udp_server_loop(host=nil, port, &b) # :yield: message, message_source
udp_server_sockets(host, port) {|sockets|
udp_server_loop_on(sockets, &b)
}
end
# UDP/IP address information used by Socket.udp_server_loop.
class UDPSource
# +remote_address+ is an Addrinfo object.
#
# +local_address+ is an Addrinfo object.
#
# +reply_proc+ is a Proc used to send reply back to the source.
def initialize(remote_address, local_address, &reply_proc)
@remote_address = remote_address
@local_address = local_address
@reply_proc = reply_proc
end
# Address of the source
attr_reader :remote_address
# Local address
attr_reader :local_address
def inspect # :nodoc:
"\#<#{self.class}: #{@remote_address.inspect_sockaddr} to #{@local_address.inspect_sockaddr}>".dup
end
# Sends the String +msg+ to the source
def reply(msg)
@reply_proc.call msg
end
end
# creates a new socket connected to path using UNIX socket socket.
#
# If a block is given, the block is called with the socket.
# The value of the block is returned.
# The socket is closed when this method returns.
#
# If no block is given, the socket is returned.
#
# # talk to /tmp/sock socket.
# Socket.unix("/tmp/sock") {|sock|
# t = Thread.new { IO.copy_stream(sock, STDOUT) }
# IO.copy_stream(STDIN, sock)
# t.join
# }
#
def self.unix(path) # :yield: socket
addr = Addrinfo.unix(path)
sock = addr.connect
if block_given?
begin
yield sock
ensure
sock.close
end
else
sock
end
end
# creates a UNIX server socket on _path_
#
# If no block given, it returns a listening socket.
#
# If a block is given, it is called with the socket and the block value is returned.
# When the block exits, the socket is closed and the socket file is removed.
#
# socket = Socket.unix_server_socket("/tmp/s")
# p socket #=> #<Socket:fd 3>
# p socket.local_address #=> #<Addrinfo: /tmp/s SOCK_STREAM>
#
# Socket.unix_server_socket("/tmp/sock") {|s|
# p s #=> #<Socket:fd 3>
# p s.local_address #=> # #<Addrinfo: /tmp/sock SOCK_STREAM>
# }
#
def self.unix_server_socket(path)
unless unix_socket_abstract_name?(path)
begin
st = File.lstat(path)
rescue Errno::ENOENT
end
if st&.socket? && st.owned?
File.unlink path
end
end
s = Addrinfo.unix(path).listen
if block_given?
begin
yield s
ensure
s.close
unless unix_socket_abstract_name?(path)
File.unlink path
end
end
else
s
end
end
class << self
private
def unix_socket_abstract_name?(path)
/linux/ =~ RUBY_PLATFORM && /\A(\0|\z)/ =~ path
end
end
# creates a UNIX socket server on _path_.
# It calls the block for each socket accepted.
#
# If _host_ is specified, it is used with _port_ to determine the server ports.
#
# The socket is *not* closed when the block returns.
# So application should close it.
#
# This method deletes the socket file pointed by _path_ at first if
# the file is a socket file and it is owned by the user of the application.
# This is safe only if the directory of _path_ is not changed by a malicious user.
# So don't use /tmp/malicious-users-directory/socket.
# Note that /tmp/socket and /tmp/your-private-directory/socket is safe assuming that /tmp has sticky bit.
#
# # Sequential echo server.
# # It services only one client at a time.
# Socket.unix_server_loop("/tmp/sock") {|sock, client_addrinfo|
# begin
# IO.copy_stream(sock, sock)
# ensure
# sock.close
# end
# }
#
def self.unix_server_loop(path, &b) # :yield: socket, client_addrinfo
unix_server_socket(path) {|serv|
accept_loop(serv, &b)
}
end
# call-seq:
# socket.connect_nonblock(remote_sockaddr, [options]) => 0
#
# Requests a connection to be made on the given +remote_sockaddr+ after
# O_NONBLOCK is set for the underlying file descriptor.
# Returns 0 if successful, otherwise an exception is raised.
#
# === Parameter
# # +remote_sockaddr+ - the +struct+ sockaddr contained in a string or Addrinfo object
#
# === Example:
# # Pull down Google's web page
# require 'socket'
# include Socket::Constants
# socket = Socket.new(AF_INET, SOCK_STREAM, 0)
# sockaddr = Socket.sockaddr_in(80, 'www.google.com')
# begin # emulate blocking connect
# socket.connect_nonblock(sockaddr)
# rescue IO::WaitWritable
# IO.select(nil, [socket]) # wait 3-way handshake completion
# begin
# socket.connect_nonblock(sockaddr) # check connection failure
# rescue Errno::EISCONN
# end
# end
# socket.write("GET / HTTP/1.0\r\n\r\n")
# results = socket.read
#
# Refer to Socket#connect for the exceptions that may be thrown if the call
# to _connect_nonblock_ fails.
#
# Socket#connect_nonblock may raise any error corresponding to connect(2) failure,
# including Errno::EINPROGRESS.
#
# If the exception is Errno::EINPROGRESS,
# it is extended by IO::WaitWritable.
# So IO::WaitWritable can be used to rescue the exceptions for retrying connect_nonblock.
#
# By specifying a keyword argument _exception_ to +false+, you can indicate
# that connect_nonblock should not raise an IO::WaitWritable exception, but
# return the symbol +:wait_writable+ instead.
#
# === See
# # Socket#connect
def connect_nonblock(addr, exception: true)
__connect_nonblock(addr, exception)
end
end
class UDPSocket < IPSocket
# call-seq:
# udpsocket.recvfrom_nonblock(maxlen [, flags[, outbuf [, options]]]) => [mesg, sender_inet_addr]
#
# Receives up to _maxlen_ bytes from +udpsocket+ using recvfrom(2) after
# O_NONBLOCK is set for the underlying file descriptor.
# _flags_ is zero or more of the +MSG_+ options.
# The first element of the results, _mesg_, is the data received.
# The second element, _sender_inet_addr_, is an array to represent the sender address.
#
# When recvfrom(2) returns 0,
# Socket#recvfrom_nonblock returns an empty string as data.
# It means an empty packet.
#
# === Parameters
# * +maxlen+ - the number of bytes to receive from the socket
# * +flags+ - zero or more of the +MSG_+ options
# * +outbuf+ - destination String buffer
# * +options+ - keyword hash, supporting `exception: false`
#
# === Example
# require 'socket'
# s1 = UDPSocket.new
# s1.bind("127.0.0.1", 0)
# s2 = UDPSocket.new
# s2.bind("127.0.0.1", 0)
# s2.connect(*s1.addr.values_at(3,1))
# s1.connect(*s2.addr.values_at(3,1))
# s1.send "aaa", 0
# begin # emulate blocking recvfrom
# p s2.recvfrom_nonblock(10) #=> ["aaa", ["AF_INET", 33302, "localhost.localdomain", "127.0.0.1"]]
# rescue IO::WaitReadable
# IO.select([s2])
# retry
# end
#
# Refer to Socket#recvfrom for the exceptions that may be thrown if the call
# to _recvfrom_nonblock_ fails.
#
# UDPSocket#recvfrom_nonblock may raise any error corresponding to recvfrom(2) failure,
# including Errno::EWOULDBLOCK.
#
# If the exception is Errno::EWOULDBLOCK or Errno::EAGAIN,
# it is extended by IO::WaitReadable.
# So IO::WaitReadable can be used to rescue the exceptions for retrying recvfrom_nonblock.
#
# By specifying a keyword argument _exception_ to +false+, you can indicate
# that recvfrom_nonblock should not raise an IO::WaitReadable exception, but
# return the symbol +:wait_readable+ instead.
#
# === See
# * Socket#recvfrom
def recvfrom_nonblock(len, flag = 0, outbuf = nil, exception: true)
__recvfrom_nonblock(len, flag, outbuf, exception)
end
end
class TCPServer < TCPSocket
# call-seq:
# tcpserver.accept_nonblock([options]) => tcpsocket
#
# Accepts an incoming connection using accept(2) after
# O_NONBLOCK is set for the underlying file descriptor.
# It returns an accepted TCPSocket for the incoming connection.
#
# === Example
# require 'socket'
# serv = TCPServer.new(2202)
# begin # emulate blocking accept
# sock = serv.accept_nonblock
# rescue IO::WaitReadable, Errno::EINTR
# IO.select([serv])
# retry
# end
# # sock is an accepted socket.
#
# Refer to Socket#accept for the exceptions that may be thrown if the call
# to TCPServer#accept_nonblock fails.
#
# TCPServer#accept_nonblock may raise any error corresponding to accept(2) failure,
# including Errno::EWOULDBLOCK.
#
# If the exception is Errno::EWOULDBLOCK, Errno::EAGAIN, Errno::ECONNABORTED, Errno::EPROTO,
# it is extended by IO::WaitReadable.
# So IO::WaitReadable can be used to rescue the exceptions for retrying accept_nonblock.
#
# By specifying a keyword argument _exception_ to +false+, you can indicate
# that accept_nonblock should not raise an IO::WaitReadable exception, but
# return the symbol +:wait_readable+ instead.
#
# === See
# * TCPServer#accept
# * Socket#accept
def accept_nonblock(exception: true)
__accept_nonblock(exception)
end
end
class UNIXServer < UNIXSocket
# call-seq:
# unixserver.accept_nonblock([options]) => unixsocket
#
# Accepts an incoming connection using accept(2) after
# O_NONBLOCK is set for the underlying file descriptor.
# It returns an accepted UNIXSocket for the incoming connection.
#
# === Example
# require 'socket'
# serv = UNIXServer.new("/tmp/sock")
# begin # emulate blocking accept
# sock = serv.accept_nonblock
# rescue IO::WaitReadable, Errno::EINTR
# IO.select([serv])
# retry
# end
# # sock is an accepted socket.
#
# Refer to Socket#accept for the exceptions that may be thrown if the call
# to UNIXServer#accept_nonblock fails.
#
# UNIXServer#accept_nonblock may raise any error corresponding to accept(2) failure,
# including Errno::EWOULDBLOCK.
#
# If the exception is Errno::EWOULDBLOCK, Errno::EAGAIN, Errno::ECONNABORTED or Errno::EPROTO,
# it is extended by IO::WaitReadable.
# So IO::WaitReadable can be used to rescue the exceptions for retrying accept_nonblock.
#
# By specifying a keyword argument _exception_ to +false+, you can indicate
# that accept_nonblock should not raise an IO::WaitReadable exception, but
# return the symbol +:wait_readable+ instead.
#
# === See
# * UNIXServer#accept
# * Socket#accept
def accept_nonblock(exception: true)
__accept_nonblock(exception)
end
end if defined?(UNIXSocket)
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