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Diffstat (limited to 'src/pkg/net/ipsock_posix.go')
| -rw-r--r-- | src/pkg/net/ipsock_posix.go | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/src/pkg/net/ipsock_posix.go b/src/pkg/net/ipsock_posix.go deleted file mode 100644 index 2ba4c8efd..000000000 --- a/src/pkg/net/ipsock_posix.go +++ /dev/null @@ -1,177 +0,0 @@ -// 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 darwin dragonfly freebsd linux nacl netbsd openbsd solaris windows - -// Internet protocol family sockets for POSIX - -package net - -import ( - "syscall" - "time" -) - -func probeIPv4Stack() bool { - s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, syscall.IPPROTO_TCP) - switch err { - case syscall.EAFNOSUPPORT, syscall.EPROTONOSUPPORT: - return false - case nil: - closesocket(s) - } - return true -} - -// Should we try to use the IPv4 socket interface if we're -// only dealing with IPv4 sockets? As long as the host system -// understands IPv6, it's okay to pass IPv4 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. -// -// probeIPv6Stack probes both basic IPv6 capability and IPv6 IPv4- -// mapping capability which is controlled by IPV6_V6ONLY socket -// option and/or kernel state "net.inet6.ip6.v6only". -// It returns two boolean values. If the first boolean value is -// true, kernel supports basic IPv6 functionality. If the second -// boolean value is true, kernel supports IPv6 IPv4-mapping. -func probeIPv6Stack() (supportsIPv6, supportsIPv4map bool) { - var probes = []struct { - laddr TCPAddr - value int - ok bool - }{ - // IPv6 communication capability - {laddr: TCPAddr{IP: ParseIP("::1")}, value: 1}, - // IPv6 IPv4-mapped address communication capability - {laddr: TCPAddr{IP: IPv4(127, 0, 0, 1)}, value: 0}, - } - - for i := range probes { - s, err := syscall.Socket(syscall.AF_INET6, syscall.SOCK_STREAM, syscall.IPPROTO_TCP) - if err != nil { - continue - } - defer closesocket(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 - } - probes[i].ok = true - } - - return probes[0].ok, probes[1].ok -} - -// favoriteAddrFamily returns the appropriate address family to -// the given net, laddr, raddr and mode. At first it figures -// address family out from the net. If mode indicates "listen" -// and laddr is a wildcard, it assumes that the user wants to -// make a passive connection with a wildcard address family, both -// AF_INET and AF_INET6, and a wildcard address like following: -// -// 1. A wild-wild listen, "tcp" + "" -// If the platform supports both IPv6 and IPv6 IPv4-mapping -// capabilities, we assume that the user want to listen on -// both IPv4 and IPv6 wildcard address over an AF_INET6 -// socket with IPV6_V6ONLY=0. Otherwise we prefer an IPv4 -// wildcard address listen over an AF_INET socket. -// -// 2. A wild-ipv4wild listen, "tcp" + "0.0.0.0" -// Same as 1. -// -// 3. A wild-ipv6wild listen, "tcp" + "[::]" -// Almost same as 1 but we prefer an IPv6 wildcard address -// listen over an AF_INET6 socket with IPV6_V6ONLY=0 when -// the platform supports IPv6 capability but not IPv6 IPv4- -// mapping capability. -// -// 4. A ipv4-ipv4wild listen, "tcp4" + "" or "0.0.0.0" -// We use an IPv4 (AF_INET) wildcard address listen. -// -// 5. A ipv6-ipv6wild listen, "tcp6" + "" or "[::]" -// We use an IPv6 (AF_INET6, 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 OpenBSD allows neither "net.inet6.ip6.v6only=1" change -// nor IPPROTO_IPV6 level IPV6_V6ONLY socket option setting. -func favoriteAddrFamily(net string, laddr, raddr sockaddr, mode string) (family int, ipv6only bool) { - switch net[len(net)-1] { - case '4': - return syscall.AF_INET, false - case '6': - return syscall.AF_INET6, true - } - - if mode == "listen" && (laddr == nil || laddr.isWildcard()) { - if supportsIPv4map { - 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 -} - -// Internet sockets (TCP, UDP, IP) - -func internetSocket(net string, laddr, raddr sockaddr, deadline time.Time, sotype, proto int, mode string, toAddr func(syscall.Sockaddr) Addr) (fd *netFD, err error) { - family, ipv6only := favoriteAddrFamily(net, laddr, raddr, mode) - return socket(net, family, sotype, proto, ipv6only, laddr, raddr, deadline, toAddr) -} - -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 - } - if ip = ip.To4(); ip == nil { - return nil, InvalidAddrError("non-IPv4 address") - } - sa := new(syscall.SockaddrInet4) - for i := 0; i < IPv4len; i++ { - sa.Addr[i] = ip[i] - } - sa.Port = port - return sa, nil - case syscall.AF_INET6: - if len(ip) == 0 { - ip = IPv6zero - } - // IPv4 callers use 0.0.0.0 to mean "announce on any available address". - // In IPv6 mode, Linux treats that as meaning "announce on 0.0.0.0", - // which it refuses to do. Rewrite to the IPv6 unspecified address. - if ip.Equal(IPv4zero) { - ip = IPv6zero - } - if ip = ip.To16(); ip == nil { - return nil, InvalidAddrError("non-IPv6 address") - } - sa := new(syscall.SockaddrInet6) - for i := 0; i < IPv6len; i++ { - sa.Addr[i] = ip[i] - } - sa.Port = port - sa.ZoneId = uint32(zoneToInt(zone)) - return sa, nil - } - return nil, InvalidAddrError("unexpected socket family") -} |