diff options
Diffstat (limited to 'ext/socket/lib')
| -rw-r--r-- | ext/socket/lib/socket.rb | 1816 |
1 files changed, 1816 insertions, 0 deletions
diff --git a/ext/socket/lib/socket.rb b/ext/socket/lib/socket.rb new file mode 100644 index 0000000000..465b74964f --- /dev/null +++ b/ext/socket/lib/socket.rb @@ -0,0 +1,1816 @@ +# 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 for #{self.ip_address}:#{self.ip_port}" + 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 nil. + # In most cases it means the connection was closed, but for UDP connections + # it may mean an empty packet was received, as the underlying API makes + # it impossible to distinguish these two cases. + # + # === 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#recv_nonblock returns nil. + # In most cases it means the connection was closed, but for UDP connections + # it may mean an empty packet was received, as the underlying API makes + # it impossible to distinguish these two cases. + # + # === 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 + + # :stopdoc: + RESOLUTION_DELAY = 0.05 + private_constant :RESOLUTION_DELAY + + CONNECTION_ATTEMPT_DELAY = 0.25 + private_constant :CONNECTION_ATTEMPT_DELAY + + ADDRESS_FAMILIES = { + ipv6: Socket::AF_INET6, + ipv4: Socket::AF_INET + }.freeze + private_constant :ADDRESS_FAMILIES + + HOSTNAME_RESOLUTION_QUEUE_UPDATED = 0 + private_constant :HOSTNAME_RESOLUTION_QUEUE_UPDATED + + IPV6_ADDRESS_FORMAT = /\A(?i:(?:(?:[0-9A-F]{1,4}:){7}(?:[0-9A-F]{1,4}|:)|(?:[0-9A-F]{1,4}:){6}(?:[0-9A-F]{1,4}|:(?:[0-9A-F]{1,4}:){1,5}[0-9A-F]{1,4}|:)|(?:[0-9A-F]{1,4}:){5}(?:(?::[0-9A-F]{1,4}){1,2}|:(?:[0-9A-F]{1,4}:){1,4}[0-9A-F]{1,4}|:)|(?:[0-9A-F]{1,4}:){4}(?:(?::[0-9A-F]{1,4}){1,3}|:(?:[0-9A-F]{1,4}:){1,3}[0-9A-F]{1,4}|:)|(?:[0-9A-F]{1,4}:){3}(?:(?::[0-9A-F]{1,4}){1,4}|:(?:[0-9A-F]{1,4}:){1,2}[0-9A-F]{1,4}|:)|(?:[0-9A-F]{1,4}:){2}(?:(?::[0-9A-F]{1,4}){1,5}|:(?:[0-9A-F]{1,4}:)[0-9A-F]{1,4}|:)|(?:[0-9A-F]{1,4}:){1}(?:(?::[0-9A-F]{1,4}){1,6}|:(?:[0-9A-F]{1,4}:){0,5}[0-9A-F]{1,4}|:)|(?:::(?:[0-9A-F]{1,4}:){0,7}[0-9A-F]{1,4}|::)))(?:%.+)?\z/ + private_constant :IPV6_ADDRESS_FORMAT + # :startdoc: + + # :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. + # + # Starting from Ruby 3.4, this method operates according to the + # Happy Eyeballs Version 2 ({RFC 8305}[https://datatracker.ietf.org/doc/html/rfc8305]) + # algorithm by default. + # + # For details on Happy Eyeballs Version 2, + # see {Socket.tcp_fast_fallback=}[rdoc-ref:Socket.tcp_fast_fallback=]. + # + # To make it behave the same as in Ruby 3.3 and earlier, + # explicitly specify the option fast_fallback:false. + # Or, setting Socket.tcp_fast_fallback=false will disable + # Happy Eyeballs Version 2 not only for this method but for all Socket globally. + # + # 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: + # + # [:resolv_timeout] Specifies the timeout in seconds from when the hostname resolution starts. + # [:connect_timeout] This method sequentially attempts connecting to all candidate destination addresses.<br>The +connect_timeout+ specifies the timeout in seconds from the start of the connection attempt to the last candidate.<br>By default, all connection attempts continue until the timeout occurs.<br>When +fast_fallback:false+ is explicitly specified,<br>a timeout is set for each connection attempt and any connection attempt that exceeds its timeout will be canceled. + # [:open_timeout] Specifies the timeout in seconds from the start of the method execution.<br>If this timeout is reached while there are still addresses that have not yet been attempted for connection, no further attempts will be made.<br>If this option is specified together with other timeout options, an +ArgumentError+ will be raised. + # [:fast_fallback] Enables the Happy Eyeballs Version 2 algorithm (enabled by default). + # + # 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, open_timeout: nil, fast_fallback: tcp_fast_fallback, &) # :yield: socket + if open_timeout && (connect_timeout || resolv_timeout) + raise ArgumentError, "Cannot specify open_timeout along with connect_timeout or resolv_timeout" + end + + sock = if fast_fallback && !(host && ip_address?(host)) && !(local_port && local_port.to_i != 0) + tcp_with_fast_fallback(host, port, local_host, local_port, connect_timeout:, resolv_timeout:, open_timeout:) + else + tcp_without_fast_fallback(host, port, local_host, local_port, connect_timeout:, resolv_timeout:, open_timeout:) + end + + if block_given? + begin + yield sock + ensure + sock.close + end + else + sock + end + end + + # :stopdoc: + def self.tcp_with_fast_fallback(host, port, local_host = nil, local_port = nil, connect_timeout: nil, resolv_timeout: nil, open_timeout: nil) + if local_host || local_port + local_addrinfos = Addrinfo.getaddrinfo(local_host, local_port, nil, :STREAM, timeout: open_timeout || resolv_timeout) + resolving_family_names = local_addrinfos.map { |lai| ADDRESS_FAMILIES.key(lai.afamily) }.uniq + else + local_addrinfos = [] + resolving_family_names = ADDRESS_FAMILIES.keys + end + + hostname_resolution_threads = [] + resolution_store = HostnameResolutionStore.new(resolving_family_names) + connecting_sockets = {} + is_windows_environment ||= (RUBY_PLATFORM =~ /mswin|mingw|cygwin/) + + now = current_clock_time + starts_at = now + resolution_delay_expires_at = nil + connection_attempt_delay_expires_at = nil + user_specified_connect_timeout_at = nil + user_specified_open_timeout_at = open_timeout ? now + open_timeout : nil + last_error = nil + last_error_from_thread = false + + if resolving_family_names.size == 1 + family_name = resolving_family_names.first + addrinfos = Addrinfo.getaddrinfo(host, port, ADDRESS_FAMILIES[:family_name], :STREAM, timeout: open_timeout || resolv_timeout) + resolution_store.add_resolved(family_name, addrinfos) + hostname_resolution_result = nil + hostname_resolution_notifier = nil + user_specified_resolv_timeout_at = nil + else + hostname_resolution_result = HostnameResolutionResult.new(resolving_family_names.size) + hostname_resolution_notifier = hostname_resolution_result.notifier + + hostname_resolution_threads.concat( + resolving_family_names.map { |family| + thread_args = [family, host, port, hostname_resolution_result] + thread = Thread.new(*thread_args) { |*thread_args| resolve_hostname(*thread_args) } + Thread.pass + thread + } + ) + user_specified_resolv_timeout_at = resolv_timeout ? now + resolv_timeout : Float::INFINITY + end + + loop do + if resolution_store.any_addrinfos? && + !resolution_delay_expires_at && + !connection_attempt_delay_expires_at + while (addrinfo = resolution_store.get_addrinfo) + if local_addrinfos.any? + local_addrinfo = local_addrinfos.find { |lai| lai.afamily == addrinfo.afamily } + + if local_addrinfo.nil? + if resolution_store.any_addrinfos? + # Try other Addrinfo in next "while" + next + elsif connecting_sockets.any? || resolution_store.any_unresolved_family? + # Exit this "while" and wait for connections to be established or hostname resolution in next loop + # Or exit this "while" and wait for hostname resolution in next loop + break + else + raise SocketError.new 'no appropriate local address' + end + end + end + + begin + if resolution_store.any_addrinfos? || + connecting_sockets.any? || + resolution_store.any_unresolved_family? + socket = Socket.new(addrinfo.pfamily, addrinfo.socktype, addrinfo.protocol) + socket.bind(local_addrinfo) if local_addrinfo + result = socket.connect_nonblock(addrinfo, exception: false) + else + timeout = + if open_timeout + t = open_timeout - (current_clock_time - starts_at) + t.negative? ? 0 : t + else + connect_timeout + end + result = socket = local_addrinfo ? + addrinfo.connect_from(local_addrinfo, timeout:) : + addrinfo.connect(timeout:) + end + + if result == :wait_writable + connection_attempt_delay_expires_at = now + CONNECTION_ATTEMPT_DELAY + if resolution_store.empty_addrinfos? + user_specified_connect_timeout_at = connect_timeout ? now + connect_timeout : Float::INFINITY + end + + connecting_sockets[socket] = addrinfo + break + else + return socket # connection established + end + rescue SystemCallError => e + socket&.close + last_error = e + + if resolution_store.any_addrinfos? + # Try other Addrinfo in next "while" + next + elsif connecting_sockets.any? || resolution_store.any_unresolved_family? + # Exit this "while" and wait for connections to be established or hostname resolution in next loop + # Or exit this "while" and wait for hostname resolution in next loop + break + else + raise last_error + end + end + end + end + + ends_at = + if resolution_store.any_addrinfos? + [(resolution_delay_expires_at || connection_attempt_delay_expires_at), + user_specified_open_timeout_at].compact.min + elsif user_specified_open_timeout_at + user_specified_open_timeout_at + else + [user_specified_resolv_timeout_at, user_specified_connect_timeout_at].compact.max + end + + hostname_resolved, writable_sockets, except_sockets = IO.select( + hostname_resolution_notifier, + connecting_sockets.keys, + # Use errorfds to wait for non-blocking connect failures on Windows + is_windows_environment ? connecting_sockets.keys : nil, + second_to_timeout(current_clock_time, ends_at), + ) + now = current_clock_time + resolution_delay_expires_at = nil if expired?(now, resolution_delay_expires_at) + connection_attempt_delay_expires_at = nil if expired?(now, connection_attempt_delay_expires_at) + + if writable_sockets&.any? + while (writable_socket = writable_sockets.pop) + is_connected = is_windows_environment || ( + sockopt = writable_socket.getsockopt(Socket::SOL_SOCKET, Socket::SO_ERROR) + sockopt.int.zero? + ) + + if is_connected + connecting_sockets.delete writable_socket + return writable_socket + else + failed_ai = connecting_sockets.delete writable_socket + writable_socket.close + ip_address = failed_ai.ipv6? ? "[#{failed_ai.ip_address}]" : failed_ai.ip_address + last_error = SystemCallError.new("connect(2) for #{ip_address}:#{failed_ai.ip_port}", sockopt.int) + + if writable_sockets.any? || connecting_sockets.any? + # Try other writable socket in next "while" + # Or exit this "while" and wait for connections to be established or hostname resolution in next loop + elsif resolution_store.any_addrinfos? || resolution_store.any_unresolved_family? + # Exit this "while" and try other connection attempt + # Or exit this "while" and wait for hostname resolution in next loop + connection_attempt_delay_expires_at = nil + user_specified_connect_timeout_at = nil + else + raise last_error + end + end + end + end + + if except_sockets&.any? + except_sockets.each do |except_socket| + failed_ai = connecting_sockets.delete except_socket + sockopt = except_socket.getsockopt(Socket::SOL_SOCKET, Socket::SO_ERROR) + except_socket.close + ip_address = failed_ai.ipv6? ? "[#{failed_ai.ip_address}]" : failed_ai.ip_address + last_error = SystemCallError.new("connect(2) for #{ip_address}:#{failed_ai.ip_port}", sockopt.int) + + if except_sockets.any? || connecting_sockets.any? + # Cleanup other except socket in next "each" + # Or exit this "while" and wait for connections to be established or hostname resolution in next loop + elsif resolution_store.any_addrinfos? || resolution_store.any_unresolved_family? + # Exit this "while" and try other connection attempt + # Or exit this "while" and wait for hostname resolution in next loop + connection_attempt_delay_expires_at = nil + user_specified_connect_timeout_at = nil + else + raise last_error + end + end + end + + if hostname_resolved&.any? + while (family_and_result = hostname_resolution_result.get) + family_name, result = family_and_result + + if result.is_a? Exception + resolution_store.add_error(family_name, result) + + unless (Socket.const_defined?(:EAI_ADDRFAMILY)) && + (result.is_a?(Socket::ResolutionError)) && + (result.error_code == Socket::EAI_ADDRFAMILY) + other = family_name == :ipv6 ? :ipv4 : :ipv6 + if !resolution_store.resolved?(other) || !resolution_store.resolved_successfully?(other) + last_error = result + last_error_from_thread = true + end + end + else + resolution_store.add_resolved(family_name, result) + end + end + + if resolution_store.resolved?(:ipv4) + if resolution_store.resolved?(:ipv6) + hostname_resolution_notifier = nil + resolution_delay_expires_at = nil + user_specified_resolv_timeout_at = nil + elsif resolution_store.resolved_successfully?(:ipv4) + resolution_delay_expires_at = now + RESOLUTION_DELAY + end + end + end + + if expired?(now, user_specified_open_timeout_at) + raise(IO::TimeoutError, "user specified timeout for #{host}:#{port}") + end + + if resolution_store.empty_addrinfos? + if connecting_sockets.empty? && resolution_store.resolved_all_families? + if last_error_from_thread + raise last_error.class, last_error.message, cause: last_error + else + raise last_error + end + end + + if (expired?(now, user_specified_resolv_timeout_at) || resolution_store.resolved_all_families?) && + (expired?(now, user_specified_connect_timeout_at) || connecting_sockets.empty?) + raise(IO::TimeoutError, "user specified timeout for #{host}:#{port}") + end + end + end + ensure + hostname_resolution_threads.each(&:exit).each(&:join) + + hostname_resolution_result&.close + + connecting_sockets.each_key(&:close) + end + private_class_method :tcp_with_fast_fallback + + def self.tcp_without_fast_fallback(host, port, local_host, local_port, connect_timeout:, resolv_timeout:, open_timeout:) + 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, timeout: open_timeout || resolv_timeout) + end + + timeout = open_timeout ? open_timeout : resolv_timeout + starts_at = current_clock_time + + Addrinfo.foreach(host, port, nil, :STREAM, 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 + timeout = + if open_timeout + t = open_timeout - (current_clock_time - starts_at) + t.negative? ? 0 : t + else + connect_timeout + end + + sock = local_addr ? + ai.connect_from(local_addr, timeout:) : + ai.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 + + ret + end + private_class_method :tcp_without_fast_fallback + + def self.ip_address?(hostname) + hostname.match?(IPV6_ADDRESS_FORMAT) || hostname.match?(/\A([0-9]{1,3}\.){3}[0-9]{1,3}\z/) + end + private_class_method :ip_address? + + def self.resolve_hostname(family, host, port, hostname_resolution_result) + begin + resolved_addrinfos = Addrinfo.getaddrinfo(host, port, ADDRESS_FAMILIES[family], :STREAM) + hostname_resolution_result.add(family, resolved_addrinfos) + rescue => e + hostname_resolution_result.add(family, e) + end + end + private_class_method :resolve_hostname + + def self.current_clock_time + Process.clock_gettime(Process::CLOCK_MONOTONIC) + end + private_class_method :current_clock_time + + def self.second_to_timeout(started_at, ends_at) + return nil if ends_at == Float::INFINITY || ends_at.nil? + + remaining = (ends_at - started_at) + remaining.negative? ? 0 : remaining + end + private_class_method :second_to_timeout + + def self.expired?(started_at, ends_at) + second_to_timeout(started_at, ends_at)&.zero? + end + private_class_method :expired? + + class HostnameResolutionResult + def initialize(size) + @size = size + @taken_count = 0 + @rpipe, @wpipe = IO.pipe + @results = [] + @mutex = Mutex.new + end + + def notifier + [@rpipe] + end + + def add(family, result) + @mutex.synchronize do + @results.push [family, result] + @wpipe.putc HOSTNAME_RESOLUTION_QUEUE_UPDATED + end + end + + def get + return nil if @results.empty? + + res = nil + + @mutex.synchronize do + @rpipe.getbyte + res = @results.shift + end + + @taken_count += 1 + close if @taken_count == @size + res + end + + def close + @rpipe.close + @wpipe.close + end + end + private_constant :HostnameResolutionResult + + class HostnameResolutionStore + PRIORITY_ON_V6 = [:ipv6, :ipv4].freeze + PRIORITY_ON_V4 = [:ipv4, :ipv6].freeze + + def initialize(family_names) + @family_names = family_names + @addrinfo_dict = {} + @error_dict = {} + @last_family = nil + end + + def add_resolved(family_name, addrinfos) + @addrinfo_dict[family_name] = addrinfos + end + + def add_error(family_name, error) + @addrinfo_dict[family_name] = [] + @error_dict[family_name] = error + end + + def get_addrinfo + precedences = + case @last_family + when :ipv4, nil then PRIORITY_ON_V6 + when :ipv6 then PRIORITY_ON_V4 + end + + precedences.each do |family_name| + addrinfo = @addrinfo_dict[family_name]&.shift + next unless addrinfo + + @last_family = family_name + return addrinfo + end + + nil + end + + def empty_addrinfos? + @addrinfo_dict.all? { |_, addrinfos| addrinfos.empty? } + end + + def any_addrinfos? + !empty_addrinfos? + end + + def resolved?(family) + @addrinfo_dict.has_key? family + end + + def resolved_successfully?(family) + resolved?(family) && !@error_dict[family] + end + + def resolved_all_families? + (@family_names - @addrinfo_dict.keys).empty? + end + + def any_unresolved_family? + !resolved_all_families? + end + end + private_constant :HostnameResolutionStore + + 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 + private_class_method :ip_sockets_port0 + + 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 + + # :stopdoc: + if RUBY_PLATFORM.include?("linux") + def self.unix_socket_abstract_name?(path) + path.empty? or path.start_with?("\0") + end + else + def self.unix_socket_abstract_name?(path) + false + end + end + private_class_method :unix_socket_abstract_name? + # :startdoc: + + # 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#recv_nonblock returns nil. + # In most cases it means the connection was closed, but it may also mean + # an empty packet was received, as the underlying API makes + # it impossible to distinguish these two cases. + # + # === 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) |