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fix(dhcp): can not renew an ip address

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The dhcp server is systemd-networkd, and the dhcp
plugin can request an ip but can not renew it.
The systemd-networkd just ignore the renew request.

```
2024/09/14 21:46:00 no DHCP packet received within 10s
2024/09/14 21:46:00 retrying in 31.529038 seconds
2024/09/14 21:46:42 no DHCP packet received within 10s
2024/09/14 21:46:42 retrying in 63.150490 seconds
2024/09/14 21:47:45 98184616c91f15419f5cacd012697f85afaa2daeb5d3233e28b0ec21589fb45a/iot/eth1: no more tries
2024/09/14 21:47:45 98184616c91f15419f5cacd012697f85afaa2daeb5d3233e28b0ec21589fb45a/iot/eth1: renewal time expired, rebinding
2024/09/14 21:47:45 Link "eth1" down. Attempting to set up
2024/09/14 21:47:45 98184616c91f15419f5cacd012697f85afaa2daeb5d3233e28b0ec21589fb45a/iot/eth1: lease rebound, expiration is 2024-09-14 22:47:45.309270751 +0800 CST m=+11730.048516519
```

Follow the https://datatracker.ietf.org/doc/html/rfc2131#section-4.3.6,
following options must not be sent in renew

- Requested IP Address
- Server Identifier

Since the upstream code has been inactive for 6 years,
we should switch to another dhcpv4 library.
The new selected one is https://github.com/insomniacslk/dhcp.

Signed-off-by: Songmin Li <lisongmin@protonmail.com>
This commit is contained in:
Songmin Li
2024-09-14 22:00:20 +08:00
committed by Casey Callendrello
parent e4950728ce
commit d61e7e5e1f
310 changed files with 12785 additions and 11182 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
vendor/github.com/insomniacslk/dhcp/dhcpv4/option_subnet_mask.go generated vendored Normal file
View File

@@ -0,0 +1,40 @@
package dhcpv4
import (
"net"
"github.com/u-root/uio/uio"
)
// IPMask represents an option encapsulating the subnet mask.
//
// This option implements the subnet mask option in RFC 2132, Section 3.3.
type IPMask net.IPMask
// ToBytes returns a serialized stream of bytes for this option.
func (im IPMask) ToBytes() []byte {
if len(im) > net.IPv4len {
return im[:net.IPv4len]
}
return im
}
// String returns a human-readable string.
func (im IPMask) String() string {
return net.IPMask(im).String()
}
// FromBytes parses im from data per RFC 2132.
func (im *IPMask) FromBytes(data []byte) error {
buf := uio.NewBigEndianBuffer(data)
*im = IPMask(buf.CopyN(net.IPv4len))
return buf.FinError()
}
// OptSubnetMask returns a new DHCPv4 SubnetMask option per RFC 2132, Section 3.3.
func OptSubnetMask(mask net.IPMask) Option {
return Option{
Code: OptionSubnetMask,
Value: IPMask(mask),
}
}