/
setup.go
94 lines (83 loc) · 1.71 KB
/
setup.go
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package blocklist
import (
"net/url"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/mholt/caddy"
)
func init() {
caddy.RegisterPlugin("blocklist", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
block, err := blocklistParse(c)
if err != nil {
return plugin.Error("blocklist", err)
}
c.OnFirstStartup(func() error {
listMetrics(c)
metricSetup(c)
return nil
})
c.OnStartup(block.Start)
c.OnShutdown(block.Stop)
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
block.Next = next
return block
})
return nil
}
func blocklistParse(c *caddy.Controller) (*Blocklist, error) {
b := New(NewMemoryDB())
for c.Next() {
url, err := expectURLArg(c)
if err != nil {
return nil, err
}
for c.NextBlock() {
var s string
var err error
switch c.Val() {
case "always_allow":
s, err = expectOneArg(c)
b.manualAllow[s] = true
case "block":
s, err = expectOneArg(c)
b.manualBlock[s] = true
default:
err = c.ArgErr()
}
if err != nil {
return nil, err
}
}
if url == "override" {
continue
}
b.lists[url] = NewList(url)
}
return b, nil
}
func expectOneArg(c *caddy.Controller) (string, error) {
if !c.NextArg() {
return "", c.ArgErr()
}
ret := c.Val()
if a := c.RemainingArgs(); len(a) > 0 {
return "", c.SyntaxErr("only one argument on line")
}
return ret, nil
}
func expectURLArg(c *caddy.Controller) (string, error) {
s, err := expectOneArg(c)
if s == "override" {
return s, err
}
u, err := url.Parse(s)
if err != nil || !u.IsAbs() {
return s, c.SyntaxErr(`valid URL or "override" keyword`)
}
return u.String(), err
}