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socket.rb
# frozen_string_literal: true require 'socket.so' unless IO.method_defined?(:wait_writable, false) # It's only required on older Rubies < v3.2: require 'io/wait' end 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) unless self.pfamily == Socket::PF_UNIX 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. # # 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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