feat(config): wildcard lan interface name support

[woshikedayaa]

Background

#724

Checklist

• The Pull Request has been fully tested
• There's an entry in the CHANGELOGS
• There is a user-facing docs PR against https://github.com/daeuniverse/dae

Full Changelogs

实现了 #724 的请求，现在支持了对于 lan_interfaces的匹配支持。

匹配规则支持 + 匹配一个字符，* 匹配多个字符。

代码变化

主要变动的是匹配部分，首先入口变成了 bindLanWildcard

global.LanInterface = common.Deduplicate(global.LanInterface)
for _, ifname := range global.LanInterface {
	if err = core.bindLanWildcard(ifname, global.AutoConfigKernelParameter); err != nil {
		return nil, fmt.Errorf("bindLan: %v: %w", ifname, err)
	}
}
  

内部实现是，首先根据匹配的 pattern 来匹配。如果不是 pattern 就只绑定单独的if。

func (c *controlPlaneCore) bindLanWildcard(ifname string, autoConfigKernelParameter bool) error {
	if !netutils.IsInterfaceNameIsWildcard(ifname) {
		return c.bindLan(ifname, autoConfigKernelParameter, false)
	}

	// bind to current existed matched-interfaces
	matcher, err := netutils.NewInterfaceMather(ifname)
	if err != nil {
		return err
	}
	interfaces, err := net.Interfaces()
        // ......
	for _, iface := range interfaces {
        // ......
	}
	// listen new link creation
	if e := c.addNewLinkBindLanCb(ifname, autoConfigKernelParameter, true); e != nil {
		return fmt.Errorf("%w: %v", err, e)
	}
	return nil
}

给 addNewLinkBindLanCb方法添加了一个 keep bool 参数来决定是否需要持续监听。

另外就是 bindLan 方法的变化。因为全局已经有一个 通过监听匹配表达式的监听回调，所以用一个参数表面如果监听删除的网卡是来自 wildcard 就不添加新的监听了。

func (c *controlPlaneCore) bindLan(ifname string, autoConfigKernelParameter bool, isFromWildcard bool) error {
	if !isFromWildcard && netutils.IsInterfaceNameIsWildcard(ifname) {
		return c.bindLanWildcard(ifname, autoConfigKernelParameter)
	}

	if autoConfigKernelParameter {
		SetSendRedirects(ifname, "0")
		SetForwarding(ifname, "1")
	}
	if err := c._bindLan(ifname); err != nil {

		var notFoundErr netlink.LinkNotFoundError
		if !errors.As(err, &notFoundErr) {
			return err
		}
		if isFromWildcard {
			return err
		}
		// Not found error.
		// Listen for `NEWLINK` to bind.
		c.log.Warnf("Link '%v' is not found. Bind LAN program to it once it is created.", ifname)
		if e := c.addNewLinkBindLanCb(ifname, autoConfigKernelParameter, false); e != nil {
			return fmt.Errorf("%w: %v", err, e)
		}
		return nil
	}

	// Listen for `DELLINK` and add `NEWLINK` callback to re-bind.
	if err := c.addLinkCb(ifname, unix.RTM_DELLINK, func(realIfname string) {
		c.log.Warnf("Link deletion of '%v' is detected. Bind LAN program to it once it is re-created.", realIfname)
		// The interface retrieved through wildcard will be handled by the global wildcard callback.
		// no need to monitor it here
		if isFromWildcard {
			return
		}
		if e := c.addNewLinkBindLanCb(realIfname, autoConfigKernelParameter, false); e != nil {
			c.log.Errorf("Failed to add callback for re-bind LAN program to '%v': %v", ifname, e)
		}
	}, false); err != nil {
		return fmt.Errorf("failed to add re-bind callback: %w", err)
	}
	return nil
}

最后，文档将在合并后添加。谢谢各位开发者的耐心查看代码。

另外还有个小问题，个人未修复(不知道咋修)。具体表现为，在一个被泛型匹配到的网卡被删除后，会报错
[Jan 04 16:49:01] ERROR addQdisc: Link not found

往提出修改意见修复(小bug 不影响使用)。

Issue Reference

#724

Test Result

在我的电脑工作正常。

帖一个测试脚本

#!/bin/bash
# Define interface name
IFACE="br-test"

# Check if running as root
if [ "$EUID" -ne 0 ]; then
    echo "Please run as root (use sudo)"
    exit 1
fi

# Create a dummy interface
ip link add ${IFACE} type dummy
if [ $? -eq 0 ]; then
    echo "Created virtual interface: ${IFACE}"
    # Bring the interface up
    ip link set ${IFACE} up
    echo "Interface ${IFACE} is up"
else
    echo "Failed to create interface"
    exit 1
fi

# Wait for user input
echo "Interface is ready. Type 'ok' to delete it:"
while true; do
    read input
    if [ "$input" = "ok" ]; then
        break
    else
        echo "Type 'ok' to delete the interface:"
    fi
done

# Delete the interface
ip link delete ${IFACE}
echo "Interface ${IFACE} has been deleted"

[jschwinger233]

golang 使用 tab 作为缩进，请用 go fmt 格式化代码。

[woshikedayaa]

已经重新 commit , cmd/internal 文件大面积爆红是因为上次提交的时候没有 format

顺便修了个 typo

---

另外，在群内讨论到后面可能需要单独修改 Callback的逻辑，以便于在 route 阶段匹配 lan 口名称。此PR 需要建议来修改可能。
@LostAttractor