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dial.go
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dial_test.go
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dnsclient.go
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dnsclient_test.go
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dnsclient_unix.go
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dnsclient_unix_test.go
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net.go
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net_fake.go
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packetconn_test.go
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parse.go
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rawconn_test.go
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server_test.go
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sock_bsd.go
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sock_cloexec.go
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Code Editor : sock_posix.go
// Copyright 2009 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows package net import ( "context" "internal/poll" "os" "syscall" ) // socket returns a network file descriptor that is ready for // asynchronous I/O using the network poller. func socket(ctx context.Context, net string, family, sotype, proto int, ipv6only bool, laddr, raddr sockaddr, ctrlFn func(string, string, syscall.RawConn) error) (fd *netFD, err error) { s, err := sysSocket(family, sotype, proto) if err != nil { return nil, err } if err = setDefaultSockopts(s, family, sotype, ipv6only); err != nil { poll.CloseFunc(s) return nil, err } if fd, err = newFD(s, family, sotype, net); err != nil { poll.CloseFunc(s) return nil, err } // This function makes a network file descriptor for the // following applications: // // - An endpoint holder that opens a passive stream // connection, known as a stream listener // // - An endpoint holder that opens a destination-unspecific // datagram connection, known as a datagram listener // // - An endpoint holder that opens an active stream or a // destination-specific datagram connection, known as a // dialer // // - An endpoint holder that opens the other connection, such // as talking to the protocol stack inside the kernel // // For stream and datagram listeners, they will only require // named sockets, so we can assume that it's just a request // from stream or datagram listeners when laddr is not nil but // raddr is nil. Otherwise we assume it's just for dialers or // the other connection holders. if laddr != nil && raddr == nil { switch sotype { case syscall.SOCK_STREAM, syscall.SOCK_SEQPACKET: if err := fd.listenStream(laddr, listenerBacklog(), ctrlFn); err != nil { fd.Close() return nil, err } return fd, nil case syscall.SOCK_DGRAM: if err := fd.listenDatagram(laddr, ctrlFn); err != nil { fd.Close() return nil, err } return fd, nil } } if err := fd.dial(ctx, laddr, raddr, ctrlFn); err != nil { fd.Close() return nil, err } return fd, nil } func (fd *netFD) ctrlNetwork() string { switch fd.net { case "unix", "unixgram", "unixpacket": return fd.net } switch fd.net[len(fd.net)-1] { case '4', '6': return fd.net } if fd.family == syscall.AF_INET { return fd.net + "4" } return fd.net + "6" } func (fd *netFD) addrFunc() func(syscall.Sockaddr) Addr { switch fd.family { case syscall.AF_INET, syscall.AF_INET6: switch fd.sotype { case syscall.SOCK_STREAM: return sockaddrToTCP case syscall.SOCK_DGRAM: return sockaddrToUDP case syscall.SOCK_RAW: return sockaddrToIP } case syscall.AF_UNIX: switch fd.sotype { case syscall.SOCK_STREAM: return sockaddrToUnix case syscall.SOCK_DGRAM: return sockaddrToUnixgram case syscall.SOCK_SEQPACKET: return sockaddrToUnixpacket } } return func(syscall.Sockaddr) Addr { return nil } } func (fd *netFD) dial(ctx context.Context, laddr, raddr sockaddr, ctrlFn func(string, string, syscall.RawConn) error) error { if ctrlFn != nil { c, err := newRawConn(fd) if err != nil { return err } var ctrlAddr string if raddr != nil { ctrlAddr = raddr.String() } else if laddr != nil { ctrlAddr = laddr.String() } if err := ctrlFn(fd.ctrlNetwork(), ctrlAddr, c); err != nil { return err } } var err error var lsa syscall.Sockaddr if laddr != nil { if lsa, err = laddr.sockaddr(fd.family); err != nil { return err } else if lsa != nil { if err = syscall.Bind(fd.pfd.Sysfd, lsa); err != nil { return os.NewSyscallError("bind", err) } } } var rsa syscall.Sockaddr // remote address from the user var crsa syscall.Sockaddr // remote address we actually connected to if raddr != nil { if rsa, err = raddr.sockaddr(fd.family); err != nil { return err } if crsa, err = fd.connect(ctx, lsa, rsa); err != nil { return err } fd.isConnected = true } else { if err := fd.init(); err != nil { return err } } // Record the local and remote addresses from the actual socket. // Get the local address by calling Getsockname. // For the remote address, use // 1) the one returned by the connect method, if any; or // 2) the one from Getpeername, if it succeeds; or // 3) the one passed to us as the raddr parameter. lsa, _ = syscall.Getsockname(fd.pfd.Sysfd) if crsa != nil { fd.setAddr(fd.addrFunc()(lsa), fd.addrFunc()(crsa)) } else if rsa, _ = syscall.Getpeername(fd.pfd.Sysfd); rsa != nil { fd.setAddr(fd.addrFunc()(lsa), fd.addrFunc()(rsa)) } else { fd.setAddr(fd.addrFunc()(lsa), raddr) } return nil } func (fd *netFD) listenStream(laddr sockaddr, backlog int, ctrlFn func(string, string, syscall.RawConn) error) error { var err error if err = setDefaultListenerSockopts(fd.pfd.Sysfd); err != nil { return err } var lsa syscall.Sockaddr if lsa, err = laddr.sockaddr(fd.family); err != nil { return err } if ctrlFn != nil { c, err := newRawConn(fd) if err != nil { return err } if err := ctrlFn(fd.ctrlNetwork(), laddr.String(), c); err != nil { return err } } if err = syscall.Bind(fd.pfd.Sysfd, lsa); err != nil { return os.NewSyscallError("bind", err) } if err = listenFunc(fd.pfd.Sysfd, backlog); err != nil { return os.NewSyscallError("listen", err) } if err = fd.init(); err != nil { return err } lsa, _ = syscall.Getsockname(fd.pfd.Sysfd) fd.setAddr(fd.addrFunc()(lsa), nil) return nil } func (fd *netFD) listenDatagram(laddr sockaddr, ctrlFn func(string, string, syscall.RawConn) error) error { switch addr := laddr.(type) { case *UDPAddr: // We provide a socket that listens to a wildcard // address with reusable UDP port when the given laddr // is an appropriate UDP multicast address prefix. // This makes it possible for a single UDP listener to // join multiple different group addresses, for // multiple UDP listeners that listen on the same UDP // port to join the same group address. if addr.IP != nil && addr.IP.IsMulticast() { if err := setDefaultMulticastSockopts(fd.pfd.Sysfd); err != nil { return err } addr := *addr switch fd.family { case syscall.AF_INET: addr.IP = IPv4zero case syscall.AF_INET6: addr.IP = IPv6unspecified } laddr = &addr } } var err error var lsa syscall.Sockaddr if lsa, err = laddr.sockaddr(fd.family); err != nil { return err } if ctrlFn != nil { c, err := newRawConn(fd) if err != nil { return err } if err := ctrlFn(fd.ctrlNetwork(), laddr.String(), c); err != nil { return err } } if err = syscall.Bind(fd.pfd.Sysfd, lsa); err != nil { return os.NewSyscallError("bind", err) } if err = fd.init(); err != nil { return err } lsa, _ = syscall.Getsockname(fd.pfd.Sysfd) fd.setAddr(fd.addrFunc()(lsa), nil) return nil }
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