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Code Editor : ipsock_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 js,wasm linux netbsd openbsd solaris windows package net import ( "context" "internal/poll" "runtime" "syscall" ) // Probe probes IPv4, IPv6 and IPv4-mapped IPv6 communication // capabilities which are controlled by the IPV6_V6ONLY socket option // and kernel configuration. // // Should we try to use the IPv4 socket interface if we're only // dealing with IPv4 sockets? As long as the host system understands // IPv4-mapped IPv6, it's okay to pass IPv4-mapeed IPv6 addresses to // the IPv6 interface. That simplifies our code and is most // general. Unfortunately, we need to run on kernels built without // IPv6 support too. So probe the kernel to figure it out. func (p *ipStackCapabilities) probe() { s, err := sysSocket(syscall.AF_INET, syscall.SOCK_STREAM, syscall.IPPROTO_TCP) switch err { case syscall.EAFNOSUPPORT, syscall.EPROTONOSUPPORT: case nil: poll.CloseFunc(s) p.ipv4Enabled = true } var probes = []struct { laddr TCPAddr value int }{ // IPv6 communication capability {laddr: TCPAddr{IP: ParseIP("::1")}, value: 1}, // IPv4-mapped IPv6 address communication capability {laddr: TCPAddr{IP: IPv4(127, 0, 0, 1)}, value: 0}, } switch runtime.GOOS { case "dragonfly", "openbsd": // The latest DragonFly BSD and OpenBSD kernels don't // support IPV6_V6ONLY=0. They always return an error // and we don't need to probe the capability. probes = probes[:1] } for i := range probes { s, err := sysSocket(syscall.AF_INET6, syscall.SOCK_STREAM, syscall.IPPROTO_TCP) if err != nil { continue } defer poll.CloseFunc(s) syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, probes[i].value) sa, err := probes[i].laddr.sockaddr(syscall.AF_INET6) if err != nil { continue } if err := syscall.Bind(s, sa); err != nil { continue } if i == 0 { p.ipv6Enabled = true } else { p.ipv4MappedIPv6Enabled = true } } } // favoriteAddrFamily returns the appropriate address family for the // given network, laddr, raddr and mode. // // If mode indicates "listen" and laddr is a wildcard, we assume that // the user wants to make a passive-open connection with a wildcard // address family, both AF_INET and AF_INET6, and a wildcard address // like the following: // // - A listen for a wildcard communication domain, "tcp" or // "udp", with a wildcard address: If the platform supports // both IPv6 and IPv4-mapped IPv6 communication capabilities, // or does not support IPv4, we use a dual stack, AF_INET6 and // IPV6_V6ONLY=0, wildcard address listen. The dual stack // wildcard address listen may fall back to an IPv6-only, // AF_INET6 and IPV6_V6ONLY=1, wildcard address listen. // Otherwise we prefer an IPv4-only, AF_INET, wildcard address // listen. // // - A listen for a wildcard communication domain, "tcp" or // "udp", with an IPv4 wildcard address: same as above. // // - A listen for a wildcard communication domain, "tcp" or // "udp", with an IPv6 wildcard address: same as above. // // - A listen for an IPv4 communication domain, "tcp4" or "udp4", // with an IPv4 wildcard address: We use an IPv4-only, AF_INET, // wildcard address listen. // // - A listen for an IPv6 communication domain, "tcp6" or "udp6", // with an IPv6 wildcard address: We use an IPv6-only, AF_INET6 // and IPV6_V6ONLY=1, wildcard address listen. // // Otherwise guess: If the addresses are IPv4 then returns AF_INET, // or else returns AF_INET6. It also returns a boolean value what // designates IPV6_V6ONLY option. // // Note that the latest DragonFly BSD and OpenBSD kernels allow // neither "net.inet6.ip6.v6only=1" change nor IPPROTO_IPV6 level // IPV6_V6ONLY socket option setting. func favoriteAddrFamily(network string, laddr, raddr sockaddr, mode string) (family int, ipv6only bool) { switch network[len(network)-1] { case '4': return syscall.AF_INET, false case '6': return syscall.AF_INET6, true } if mode == "listen" && (laddr == nil || laddr.isWildcard()) { if supportsIPv4map() || !supportsIPv4() { return syscall.AF_INET6, false } if laddr == nil { return syscall.AF_INET, false } return laddr.family(), false } if (laddr == nil || laddr.family() == syscall.AF_INET) && (raddr == nil || raddr.family() == syscall.AF_INET) { return syscall.AF_INET, false } return syscall.AF_INET6, false } func internetSocket(ctx context.Context, net string, laddr, raddr sockaddr, sotype, proto int, mode string, ctrlFn func(string, string, syscall.RawConn) error) (fd *netFD, err error) { if (runtime.GOOS == "aix" || runtime.GOOS == "windows" || runtime.GOOS == "openbsd") && mode == "dial" && raddr.isWildcard() { raddr = raddr.toLocal(net) } family, ipv6only := favoriteAddrFamily(net, laddr, raddr, mode) return socket(ctx, net, family, sotype, proto, ipv6only, laddr, raddr, ctrlFn) } func ipToSockaddr(family int, ip IP, port int, zone string) (syscall.Sockaddr, error) { switch family { case syscall.AF_INET: if len(ip) == 0 { ip = IPv4zero } ip4 := ip.To4() if ip4 == nil { return nil, &AddrError{Err: "non-IPv4 address", Addr: ip.String()} } sa := &syscall.SockaddrInet4{Port: port} copy(sa.Addr[:], ip4) return sa, nil case syscall.AF_INET6: // In general, an IP wildcard address, which is either // "0.0.0.0" or "::", means the entire IP addressing // space. For some historical reason, it is used to // specify "any available address" on some operations // of IP node. // // When the IP node supports IPv4-mapped IPv6 address, // we allow a listener to listen to the wildcard // address of both IP addressing spaces by specifying // IPv6 wildcard address. if len(ip) == 0 || ip.Equal(IPv4zero) { ip = IPv6zero } // We accept any IPv6 address including IPv4-mapped // IPv6 address. ip6 := ip.To16() if ip6 == nil { return nil, &AddrError{Err: "non-IPv6 address", Addr: ip.String()} } sa := &syscall.SockaddrInet6{Port: port, ZoneId: uint32(zoneCache.index(zone))} copy(sa.Addr[:], ip6) return sa, nil } return nil, &AddrError{Err: "invalid address family", Addr: ip.String()} }
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