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switch to encoding DHCP options instead of appending

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soypat
2025-07-04 00:26:25 -03:00
parent 234d3835a0
commit 9c0e250cf6
4 changed files with 132 additions and 36 deletions
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dhcpv4/definitions.go
+14 -10
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@@ -35,18 +35,19 @@ func (state ClientState) HasIP() bool {
return state == StateBound || state == StateRenewing || state == StateRebinding
}
func AppendOption(dst []byte, opt OptNum, data ...byte) []byte {
if len(data) > 255 {
panic("option data too long")
}
dst = append(dst, byte(opt), byte(len(data)))
dst = append(dst, data...)
return dst
func EncodeOptionString(dst []byte, opt OptNum, data string) (int, error) {
bdata := unsafe.Slice(unsafe.StringData(data), len(data))
return EncodeOption(dst, opt, bdata...)
}
func AppendOptionString(dst []byte, opt OptNum, data string) []byte {
bdata := unsafe.Slice(unsafe.StringData(data), len(data))
return AppendOption(dst, opt, bdata...)
func EncodeOption16(dst []byte, opt OptNum, v uint16) (int, error) {
// See binary.BigEndian.PutUint16()
return EncodeOption(dst, opt, byte(v>>8), byte(v))
}
func EncodeOption32(dst []byte, opt OptNum, v uint32) (int, error) {
// See binary.BigEndian.PutUint32()
return EncodeOption(dst, opt, byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
}
func EncodeOption(dst []byte, opt OptNum, data ...byte) (int, error) {
@@ -66,6 +67,8 @@ type OptNum uint8
// DHCP options. Taken from https://help.sonicwall.com/help/sw/eng/6800/26/2/3/content/Network_DHCP_Server.042.12.htm.
const (
OptEnd OptNum = 255 // end options
OptWordAligned OptNum = 0 // word-aligned
OptSubnetMask OptNum = 1 // subnet mask
OptTimeOffset OptNum = 2 // Time offset in seconds from UTC
@@ -128,6 +131,7 @@ const (
OptRebindingTimeValue OptNum = 59 // DHCP rebinding (T2) time
OptClientIdentifier OptNum = 60 // Client identifier
OptClientIdentifier1 OptNum = 61 // Client identifier(1)
)
type Op byte