/
net.go
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/
net.go
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package funcs
import (
"context"
"fmt"
"math/big"
stdnet "net"
"net/netip"
"github.com/hairyhenderson/gomplate/v4/conv"
"github.com/hairyhenderson/gomplate/v4/internal/cidr"
"github.com/hairyhenderson/gomplate/v4/internal/deprecated"
"github.com/hairyhenderson/gomplate/v4/net"
"go4.org/netipx"
"inet.af/netaddr"
)
// NetNS - the net namespace
//
// Deprecated: don't use
func NetNS() *NetFuncs {
return &NetFuncs{}
}
// AddNetFuncs -
//
// Deprecated: use [CreateNetFuncs] instead
func AddNetFuncs(f map[string]interface{}) {
for k, v := range CreateNetFuncs(context.Background()) {
f[k] = v
}
}
// CreateNetFuncs -
func CreateNetFuncs(ctx context.Context) map[string]interface{} {
ns := &NetFuncs{ctx}
return map[string]interface{}{
"net": func() interface{} { return ns },
}
}
// NetFuncs -
type NetFuncs struct {
ctx context.Context
}
// LookupIP -
func (f NetFuncs) LookupIP(name interface{}) (string, error) {
return net.LookupIP(conv.ToString(name))
}
// LookupIPs -
func (f NetFuncs) LookupIPs(name interface{}) ([]string, error) {
return net.LookupIPs(conv.ToString(name))
}
// LookupCNAME -
func (f NetFuncs) LookupCNAME(name interface{}) (string, error) {
return net.LookupCNAME(conv.ToString(name))
}
// LookupSRV -
func (f NetFuncs) LookupSRV(name interface{}) (*stdnet.SRV, error) {
return net.LookupSRV(conv.ToString(name))
}
// LookupSRVs -
func (f NetFuncs) LookupSRVs(name interface{}) ([]*stdnet.SRV, error) {
return net.LookupSRVs(conv.ToString(name))
}
// LookupTXT -
func (f NetFuncs) LookupTXT(name interface{}) ([]string, error) {
return net.LookupTXT(conv.ToString(name))
}
// ParseIP -
//
// Deprecated: use [ParseAddr] instead
func (f *NetFuncs) ParseIP(ip interface{}) (netaddr.IP, error) {
deprecated.WarnDeprecated(f.ctx, "net.ParseIP is deprecated - use net.ParseAddr instead")
return netaddr.ParseIP(conv.ToString(ip))
}
// ParseIPPrefix -
//
// Deprecated: use [ParsePrefix] instead
func (f *NetFuncs) ParseIPPrefix(ipprefix interface{}) (netaddr.IPPrefix, error) {
deprecated.WarnDeprecated(f.ctx, "net.ParseIPPrefix is deprecated - use net.ParsePrefix instead")
return netaddr.ParseIPPrefix(conv.ToString(ipprefix))
}
// ParseIPRange -
//
// Deprecated: use [ParseRange] instead
func (f *NetFuncs) ParseIPRange(iprange interface{}) (netaddr.IPRange, error) {
deprecated.WarnDeprecated(f.ctx, "net.ParseIPRange is deprecated - use net.ParseRange instead")
return netaddr.ParseIPRange(conv.ToString(iprange))
}
// ParseAddr -
func (f NetFuncs) ParseAddr(ip interface{}) (netip.Addr, error) {
return netip.ParseAddr(conv.ToString(ip))
}
// ParsePrefix -
func (f NetFuncs) ParsePrefix(ipprefix interface{}) (netip.Prefix, error) {
return netip.ParsePrefix(conv.ToString(ipprefix))
}
// ParseRange -
//
// Experimental: this API may change in the future
func (f NetFuncs) ParseRange(iprange interface{}) (netipx.IPRange, error) {
return netipx.ParseIPRange(conv.ToString(iprange))
}
// func (f *NetFuncs) parseStdnetIPNet(prefix interface{}) (*stdnet.IPNet, error) {
// switch p := prefix.(type) {
// case *stdnet.IPNet:
// return p, nil
// case netaddr.IPPrefix:
// deprecated.WarnDeprecated(f.ctx,
// "support for netaddr.IPPrefix is deprecated - use net.ParsePrefix to produce a netip.Prefix instead")
// return p.Masked().IPNet(), nil
// case netip.Prefix:
// net := &stdnet.IPNet{
// IP: p.Masked().Addr().AsSlice(),
// Mask: stdnet.CIDRMask(p.Bits(), p.Addr().BitLen()),
// }
// return net, nil
// default:
// _, network, err := stdnet.ParseCIDR(conv.ToString(prefix))
// return network, err
// }
// }
// TODO: look at using this instead of parseStdnetIPNet
func (f *NetFuncs) parseNetipPrefix(prefix interface{}) (netip.Prefix, error) {
switch p := prefix.(type) {
case *stdnet.IPNet:
return f.ipPrefixFromIPNet(p), nil
case netaddr.IPPrefix:
deprecated.WarnDeprecated(f.ctx,
"support for netaddr.IPPrefix is deprecated - use net.ParsePrefix to produce a netip.Prefix instead")
return f.ipPrefixFromIPNet(p.Masked().IPNet()), nil
case netip.Prefix:
return p, nil
default:
return netip.ParsePrefix(conv.ToString(prefix))
}
}
// func (f NetFuncs) ipFromNetIP(n stdnet.IP) netip.Addr {
// ip, _ := netip.AddrFromSlice(n)
// return ip
// }
func (f NetFuncs) ipPrefixFromIPNet(n *stdnet.IPNet) netip.Prefix {
ip, _ := netip.AddrFromSlice(n.IP)
ones, _ := n.Mask.Size()
return netip.PrefixFrom(ip, ones)
}
// CIDRHost -
// Experimental!
func (f *NetFuncs) CIDRHost(hostnum interface{}, prefix interface{}) (netip.Addr, error) {
if err := checkExperimental(f.ctx); err != nil {
return netip.Addr{}, err
}
network, err := f.parseNetipPrefix(prefix)
if err != nil {
return netip.Addr{}, err
}
ip, err := cidr.HostBig(network, big.NewInt(conv.ToInt64(hostnum)))
return ip, err
}
// CIDRNetmask -
// Experimental!
func (f *NetFuncs) CIDRNetmask(prefix interface{}) (netip.Addr, error) {
if err := checkExperimental(f.ctx); err != nil {
return netip.Addr{}, err
}
p, err := f.parseNetipPrefix(prefix)
if err != nil {
return netip.Addr{}, err
}
// fill an appropriately sized byte slice with as many 1s as prefix bits
b := make([]byte, p.Addr().BitLen()/8)
for i := 0; i < p.Bits(); i++ {
b[i/8] |= 1 << uint(7-i%8)
}
m, ok := netip.AddrFromSlice(b)
if !ok {
return netip.Addr{}, fmt.Errorf("invalid netmask")
}
return m, nil
}
// CIDRSubnets -
// Experimental!
func (f *NetFuncs) CIDRSubnets(newbits interface{}, prefix interface{}) ([]netip.Prefix, error) {
if err := checkExperimental(f.ctx); err != nil {
return nil, err
}
network, err := f.parseNetipPrefix(prefix)
if err != nil {
return nil, err
}
nBits := conv.ToInt(newbits)
if nBits < 1 {
return nil, fmt.Errorf("must extend prefix by at least one bit")
}
maxNetNum := int64(1 << uint64(nBits))
retValues := make([]netip.Prefix, maxNetNum)
for i := int64(0); i < maxNetNum; i++ {
subnet, err := cidr.SubnetBig(network, nBits, big.NewInt(i))
if err != nil {
return nil, err
}
retValues[i] = subnet
}
return retValues, nil
}
// CIDRSubnetSizes -
// Experimental!
func (f *NetFuncs) CIDRSubnetSizes(args ...interface{}) ([]netip.Prefix, error) {
if err := checkExperimental(f.ctx); err != nil {
return nil, err
}
if len(args) < 2 {
return nil, fmt.Errorf("wrong number of args: want 2 or more, got %d", len(args))
}
network, err := f.parseNetipPrefix(args[len(args)-1])
if err != nil {
return nil, err
}
newbits := conv.ToInts(args[:len(args)-1]...)
startPrefixLen := network.Bits()
firstLength := newbits[0]
firstLength += startPrefixLen
retValues := make([]netip.Prefix, len(newbits))
current, _ := cidr.PreviousSubnet(network, firstLength)
for i, length := range newbits {
if length < 1 {
return nil, fmt.Errorf("must extend prefix by at least one bit")
}
// For portability with 32-bit systems where the subnet number
// will be a 32-bit int, we only allow extension of 32 bits in
// one call even if we're running on a 64-bit machine.
// (Of course, this is significant only for IPv6.)
if length > 32 {
return nil, fmt.Errorf("may not extend prefix by more than 32 bits")
}
length += startPrefixLen
if length > network.Addr().BitLen() {
protocol := "IP"
switch {
case network.Addr().Is4():
protocol = "IPv4"
case network.Addr().Is6():
protocol = "IPv6"
}
return nil, fmt.Errorf("would extend prefix to %d bits, which is too long for an %s address", length, protocol)
}
next, rollover := cidr.NextSubnet(current, length)
if rollover || !network.Contains(next.Addr()) {
// If we run out of suffix bits in the base CIDR prefix then
// NextSubnet will start incrementing the prefix bits, which
// we don't allow because it would then allocate addresses
// outside of the caller's given prefix.
return nil, fmt.Errorf("not enough remaining address space for a subnet with a prefix of %d bits after %s", length, current.String())
}
current = next
retValues[i] = current
}
return retValues, nil
}