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// 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.
package net
import (
"os";
"syscall";
"net"
)
export func IPv4ToSockaddr(p *[]byte, port int) (sa1 *syscall.Sockaddr, err *os.Error) {
p = ToIPv4(p);
if p == nil || port < 0 || port > 0xFFFF {
return nil, os.EINVAL
}
sa := new(syscall.SockaddrInet4);
sa.family = syscall.AF_INET;
sa.port[0] = byte(port>>8);
sa.port[1] = byte(port);
for i := 0; i < IPv4len; i++ {
sa.addr[i] = p[i]
}
return syscall.SockaddrInet4ToSockaddr(sa), nil
}
var IPv6zero [16]byte;
export func IPv6ToSockaddr(p *[]byte, port int) (sa1 *syscall.Sockaddr, err *os.Error) {
p = ToIPv6(p);
if p == nil || port < 0 || port > 0xFFFF {
return nil, os.EINVAL
}
// 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 all zeros.
if p4 := ToIPv4(p); p4 != nil && p4[0] == 0 && p4[1] == 0 && p4[2] == 0 && p4[3] == 0 {
p = &IPv6zero;
}
sa := new(syscall.SockaddrInet6);
sa.family = syscall.AF_INET6;
sa.port[0] = byte(port>>8);
sa.port[1] = byte(port);
for i := 0; i < IPv6len; i++ {
sa.addr[i] = p[i]
}
return syscall.SockaddrInet6ToSockaddr(sa), nil
}
export func SockaddrToIP(sa1 *syscall.Sockaddr) (p *[]byte, port int, err *os.Error) {
switch sa1.family {
case syscall.AF_INET:
sa := syscall.SockaddrToSockaddrInet4(sa1);
a := ToIPv6(&sa.addr);
if a == nil {
return nil, 0, os.EINVAL
}
return a, int(sa.port[0])<<8 + int(sa.port[1]), nil;
case syscall.AF_INET6:
sa := syscall.SockaddrToSockaddrInet6(sa1);
a := ToIPv6(&sa.addr);
if a == nil {
return nil, 0, os.EINVAL
}
return a, int(sa.port[0])<<8 + int(sa.port[1]), nil;
default:
return nil, 0, os.EINVAL
}
return nil, 0, nil // not reached
}
export func ListenBacklog() int64 {
// TODO: Read the limit from /proc/sys/net/core/somaxconn,
// to take advantage of kernels that have raised the limit.
return syscall.SOMAXCONN
}
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