README
¶
package extnetip
extnetip is an extension package to the stdlib net/netip.
Some missing math functions are added to the closed private internals of netip.Addr using unsafe.
No further types are defined, only helper functions on the existing types netip.Addr and netip.Prefix.
With these tiny extensions, third party IP-Range libraries, based on the stdlib net/netip, are now possible without further bytes/bits fumbling.
API
func Range(p netip.Prefix) (first, last netip.Addr)
func Prefix(first, last netip.Addr) (prefix netip.Prefix, ok bool)
func Prefixes(first, last netip.Addr) []netip.Prefix
func AppendPrefixes(dst []netip.Prefix, first, last netip.Addr) []netip.Prefix
Future
Hopefully some day these tiny helper functions are added to netip by the stdlib maintainers, currently (2022)
they refused the proposal.
Importpath
import "github.com/gaissmai/extnetip"
Documentation
¶
Overview ¶
extnetip is an extension to net/netip.
Some missing math functions are added to the closed private internals of netip using unsafe.
No further types are defined, only helper functions on existing net/netip types.
With these tiny extensions, third party IP-Range libraries, based on the stdlib net/netip, are now possible without further bytes/bits fumbling.
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func AppendPrefixes ¶
AppendPrefixes is an append version of Prefixes. It appends the netip.Prefix entries to dst that covers the IP range from first to last.
func Prefix ¶
Prefix returns the netip.Prefix from first to last and ok=true, if it can be presented exactly as such.
If first or last are not valid, in the wrong order or not exactly equal to one prefix, ok is false.
Example ¶
package main
import (
"fmt"
"net/netip"
"github.com/gaissmai/extnetip"
)
func main() {
start := netip.MustParseAddr("fe80::")
last := netip.MustParseAddr("fe80::7")
pfx, ok := extnetip.Prefix(start, last)
fmt.Println("OK: ", ok)
fmt.Println("Prefix:", pfx)
}
Output: OK: true Prefix: fe80::/125
func Prefixes ¶
Prefixes returns the set of netip.Prefix entries that covers the IP range from first to last.
If first or last are invalid, in the wrong order, or if they're of different address families, then Prefixes returns nil.
Prefixes necessarily allocates. See AppendPrefixes for a version that uses memory you provide.
Example ¶
package main
import (
"fmt"
"net/netip"
"github.com/gaissmai/extnetip"
)
func main() {
start := netip.MustParseAddr("10.1.0.0")
last := netip.MustParseAddr("10.1.13.233")
pfxs := extnetip.Prefixes(start, last)
fmt.Println("Prefixes:")
for _, pfx := range pfxs {
fmt.Println(pfx)
}
}
Output: Prefixes: 10.1.0.0/21 10.1.8.0/22 10.1.12.0/24 10.1.13.0/25 10.1.13.128/26 10.1.13.192/27 10.1.13.224/29 10.1.13.232/31
func Range ¶
Range returns the inclusive range of IP addresses that p covers.
If p is invalid, Range returns the zero values.
Example ¶
package main
import (
"fmt"
"net/netip"
"github.com/gaissmai/extnetip"
)
func main() {
pfx := netip.MustParsePrefix("fe80::/10")
start, last := extnetip.Range(pfx)
fmt.Println("Start:", start)
fmt.Println("Last: ", last)
}
Output: Start: fe80:: Last: febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff
Types ¶
This section is empty.
Source Files