151 lines
3.4 KiB
Go
151 lines
3.4 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build aix darwin dragonfly freebsd linux nacl netbsd openbsd solaris windows
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package net
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import (
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"context"
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"syscall"
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)
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func sockaddrToIP(sa syscall.Sockaddr) Addr {
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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return &IPAddr{IP: sa.Addr[0:]}
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case *syscall.SockaddrInet6:
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return &IPAddr{IP: sa.Addr[0:], Zone: zoneCache.name(int(sa.ZoneId))}
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}
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return nil
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}
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func (a *IPAddr) family() int {
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if a == nil || len(a.IP) <= IPv4len {
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return syscall.AF_INET
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}
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if a.IP.To4() != nil {
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return syscall.AF_INET
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}
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return syscall.AF_INET6
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}
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func (a *IPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
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if a == nil {
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return nil, nil
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}
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return ipToSockaddr(family, a.IP, 0, a.Zone)
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}
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func (a *IPAddr) toLocal(net string) sockaddr {
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return &IPAddr{loopbackIP(net), a.Zone}
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}
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func (c *IPConn) readFrom(b []byte) (int, *IPAddr, error) {
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// TODO(cw,rsc): consider using readv if we know the family
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// type to avoid the header trim/copy
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var addr *IPAddr
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n, sa, err := c.fd.readFrom(b)
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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addr = &IPAddr{IP: sa.Addr[0:]}
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n = stripIPv4Header(n, b)
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case *syscall.SockaddrInet6:
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addr = &IPAddr{IP: sa.Addr[0:], Zone: zoneCache.name(int(sa.ZoneId))}
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}
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return n, addr, err
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}
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func stripIPv4Header(n int, b []byte) int {
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if len(b) < 20 {
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return n
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}
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l := int(b[0]&0x0f) << 2
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if 20 > l || l > len(b) {
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return n
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}
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if b[0]>>4 != 4 {
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return n
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}
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copy(b, b[l:])
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return n - l
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}
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func (c *IPConn) readMsg(b, oob []byte) (n, oobn, flags int, addr *IPAddr, err error) {
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var sa syscall.Sockaddr
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n, oobn, flags, sa, err = c.fd.readMsg(b, oob)
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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addr = &IPAddr{IP: sa.Addr[0:]}
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case *syscall.SockaddrInet6:
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addr = &IPAddr{IP: sa.Addr[0:], Zone: zoneCache.name(int(sa.ZoneId))}
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}
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return
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}
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func (c *IPConn) writeTo(b []byte, addr *IPAddr) (int, error) {
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if c.fd.isConnected {
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return 0, ErrWriteToConnected
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}
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if addr == nil {
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return 0, errMissingAddress
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}
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sa, err := addr.sockaddr(c.fd.family)
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if err != nil {
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return 0, err
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}
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return c.fd.writeTo(b, sa)
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}
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func (c *IPConn) writeMsg(b, oob []byte, addr *IPAddr) (n, oobn int, err error) {
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if c.fd.isConnected {
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return 0, 0, ErrWriteToConnected
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}
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if addr == nil {
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return 0, 0, errMissingAddress
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}
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sa, err := addr.sockaddr(c.fd.family)
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if err != nil {
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return 0, 0, err
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}
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return c.fd.writeMsg(b, oob, sa)
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}
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func dialIP(ctx context.Context, netProto string, laddr, raddr *IPAddr) (*IPConn, error) {
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network, proto, err := parseNetwork(ctx, netProto, true)
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if err != nil {
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return nil, err
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}
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switch network {
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case "ip", "ip4", "ip6":
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default:
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return nil, UnknownNetworkError(netProto)
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}
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if raddr == nil {
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return nil, errMissingAddress
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}
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fd, err := internetSocket(ctx, network, laddr, raddr, syscall.SOCK_RAW, proto, "dial")
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if err != nil {
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return nil, err
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}
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return newIPConn(fd), nil
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}
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func listenIP(ctx context.Context, netProto string, laddr *IPAddr) (*IPConn, error) {
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network, proto, err := parseNetwork(ctx, netProto, true)
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if err != nil {
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return nil, err
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}
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switch network {
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case "ip", "ip4", "ip6":
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default:
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return nil, UnknownNetworkError(netProto)
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}
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fd, err := internetSocket(ctx, network, laddr, nil, syscall.SOCK_RAW, proto, "listen")
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if err != nil {
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return nil, err
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}
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return newIPConn(fd), nil
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}
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