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- // Copyright 2010 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.
- //go:build aix || darwin || dragonfly || freebsd || hurd || (js && wasm) || linux || netbsd || openbsd || solaris || windows
- package net
- import (
- "context"
- "syscall"
- )
- func sockaddrToIP(sa syscall.Sockaddr) Addr {
- switch sa := sa.(type) {
- case *syscall.SockaddrInet4:
- return &IPAddr{IP: sa.Addr[0:]}
- case *syscall.SockaddrInet6:
- return &IPAddr{IP: sa.Addr[0:], Zone: zoneCache.name(int(sa.ZoneId))}
- }
- return nil
- }
- func (a *IPAddr) family() int {
- if a == nil || len(a.IP) <= IPv4len {
- return syscall.AF_INET
- }
- if a.IP.To4() != nil {
- return syscall.AF_INET
- }
- return syscall.AF_INET6
- }
- func (a *IPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
- if a == nil {
- return nil, nil
- }
- return ipToSockaddr(family, a.IP, 0, a.Zone)
- }
- func (a *IPAddr) toLocal(net string) sockaddr {
- return &IPAddr{loopbackIP(net), a.Zone}
- }
- func (c *IPConn) readFrom(b []byte) (int, *IPAddr, error) {
- // TODO(cw,rsc): consider using readv if we know the family
- // type to avoid the header trim/copy
- var addr *IPAddr
- n, sa, err := c.fd.readFrom(b)
- switch sa := sa.(type) {
- case *syscall.SockaddrInet4:
- addr = &IPAddr{IP: sa.Addr[0:]}
- n = stripIPv4Header(n, b)
- case *syscall.SockaddrInet6:
- addr = &IPAddr{IP: sa.Addr[0:], Zone: zoneCache.name(int(sa.ZoneId))}
- }
- return n, addr, err
- }
- func stripIPv4Header(n int, b []byte) int {
- if len(b) < 20 {
- return n
- }
- l := int(b[0]&0x0f) << 2
- if 20 > l || l > len(b) {
- return n
- }
- if b[0]>>4 != 4 {
- return n
- }
- copy(b, b[l:])
- return n - l
- }
- func (c *IPConn) readMsg(b, oob []byte) (n, oobn, flags int, addr *IPAddr, err error) {
- var sa syscall.Sockaddr
- n, oobn, flags, sa, err = c.fd.readMsg(b, oob, 0)
- switch sa := sa.(type) {
- case *syscall.SockaddrInet4:
- addr = &IPAddr{IP: sa.Addr[0:]}
- case *syscall.SockaddrInet6:
- addr = &IPAddr{IP: sa.Addr[0:], Zone: zoneCache.name(int(sa.ZoneId))}
- }
- return
- }
- func (c *IPConn) writeTo(b []byte, addr *IPAddr) (int, error) {
- if c.fd.isConnected {
- return 0, ErrWriteToConnected
- }
- if addr == nil {
- return 0, errMissingAddress
- }
- sa, err := addr.sockaddr(c.fd.family)
- if err != nil {
- return 0, err
- }
- return c.fd.writeTo(b, sa)
- }
- func (c *IPConn) writeMsg(b, oob []byte, addr *IPAddr) (n, oobn int, err error) {
- if c.fd.isConnected {
- return 0, 0, ErrWriteToConnected
- }
- if addr == nil {
- return 0, 0, errMissingAddress
- }
- sa, err := addr.sockaddr(c.fd.family)
- if err != nil {
- return 0, 0, err
- }
- return c.fd.writeMsg(b, oob, sa)
- }
- func (sd *sysDialer) dialIP(ctx context.Context, laddr, raddr *IPAddr) (*IPConn, error) {
- network, proto, err := parseNetwork(ctx, sd.network, true)
- if err != nil {
- return nil, err
- }
- switch network {
- case "ip", "ip4", "ip6":
- default:
- return nil, UnknownNetworkError(sd.network)
- }
- fd, err := internetSocket(ctx, network, laddr, raddr, syscall.SOCK_RAW, proto, "dial", sd.Dialer.Control)
- if err != nil {
- return nil, err
- }
- return newIPConn(fd), nil
- }
- func (sl *sysListener) listenIP(ctx context.Context, laddr *IPAddr) (*IPConn, error) {
- network, proto, err := parseNetwork(ctx, sl.network, true)
- if err != nil {
- return nil, err
- }
- switch network {
- case "ip", "ip4", "ip6":
- default:
- return nil, UnknownNetworkError(sl.network)
- }
- fd, err := internetSocket(ctx, network, laddr, nil, syscall.SOCK_RAW, proto, "listen", sl.ListenConfig.Control)
- if err != nil {
- return nil, err
- }
- return newIPConn(fd), nil
- }
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