r00t2/go_subnetter
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v0.2.5

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ADDED:
* num-addrs subcommand, to get the number of hosts/addresses in a given
  prefix length
* get-net subcommand, to more easily get a single subnet from either the
  beginning or the end of a prefix. (MUCH FASTER than CIDR-splitting!)
This commit is contained in:
brent saner
2025-04-13 18:25:32 -04:00
parent c05f9c4d47
commit 860ad5842b
16 changed files with 334 additions and 78 deletions
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19
cmd/subnetter/args.go
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@@ -2,11 +2,13 @@ package main
type Args struct {
Version verArgs `command:"version" alias:"v" description:"Show version information." validate:"omitempty"`
SplitCIDR SplitCIDRArgs `command:"split-cidr" alias:"sc" description:"Split a network into as many equal subnets of prefix size N as possible." validate:"omitempty"`
GetPfx GetPfxArgs `command:"get-net" alias:"gn" description:"Get a single subnet from a network at either the beginning or end. (You'll probably want to enable -r/--no-remaining.)" validate:"omitempty"`
SplitCIDR SplitCIDRArgs `command:"split-cidr" alias:"sc" description:"Split a network into as many equal subnets of prefix size N as possible. (This may have issues/take a very long time if you are splitting a very large network into many very small subnets.)" validate:"omitempty"`
SplitHost SplitHostArgs `command:"split-hosts" alias:"sh" description:"Split a network into N total number of hosts *per subnet* as cleanly/evenly as possible." validate:"omitempty"`
SplitSubnets SplitSubnetArgs `command:"split-nets" alias:"sn" description:"Split a network into N number of subnets as cleanly as possible." validate:"omitempty"`
VLSM VLSMArgs `command:"split-vlsm" alias:"sv" alias:"vlsm" description:"Use VLSM (Variable-Length Subnet Masks) to split a network into differently sized subnets." validate:"omitempty"`
ExplicitNetwork XNetArgs `command:"net" alias:"xn" alias:"net" description:"Print information about an explicit network address." validate:"omitempty"`
NumAddrs NAddrArgs `command:"num-addrs" alias:"na" alias:"addrs" description:"Return the number of addresses/hosts in a given network size. (This saves needing to lookup from the table subcommand.)" validate:"omitempty"`
NumNets NNetArgs `command:"num-nets" alias:"nn" alias:"nets" description:"Return the number of subnets of a given size that can fit into a given network size. This is MUCH, MUCH FASTER than splitting (if you do not need addressing)." validate:"omitempty"`
Parse ParseArgs `command:"parse" alias:"p" alias:"read" alias:"convert" description:"Parse/convert output from a previous subnetter run." validate:"omitempty"`
Table TableArgs `command:"table" alias:"t" alias:"tab" alias:"tbl" description:"Show prefix summaries (by default both IPv4 and IPv6)." validate:"omitempty"`
@@ -49,6 +51,21 @@ type cacheArgs struct {
DoResCache bool `short:"c" long:"cache-reservations" env:"SBNTR_RSVCACHE" description:"Enable caching/cache lookup for reservation data."`
}
type GetPfxArgs struct {
Position string `short:"P" long:"position" choice:"first" choice:"last" default:"first" description:"The position of the subnet within the network." validate:"required,oneof=first last"`
Prefix uint8 `short:"s" long:"size" required:"true" description:"Prefix length/network size in bits (as CIDR number)." validate:"required"`
splitArgs
}
type NAddrArgs struct {
Isv6 bool `short:"6" long:"v6" description:"If the prefix given is <=32, specify this flag to indicate that it is an IPv6 prefix and not IPv4. (If it is >32, it is automatically treated as an IPv6 prefix for obvious reasons.)"`
InclNetAddr bool `short:"N" long:"incl-net" description:"If specified, include the network address in the count."`
InclBcastAddr bool `short:"B" long:"incl-bcast" description:"If specified, include the broadcast/reserved broadcast address in the count."`
Size struct {
PrefixSize uint8 `positional-arg-name:"<prefix length>" required:"1" validate:"lte=128"`
} `positional-args:"yes" required:"1" validate:"required"`
}
type NNetArgs struct {
Verbose bool `short:"v" long:"verbose" description:"Be verbose (more ideal for logging)."`
NoV6Check bool `short:"6" long:"no-v6" description:"If specified, do not indicate if the subnetting is IPv6 only (true) or not (false; dual-stack/IPv4 supported)."`