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|
package autopath
import (
"fmt"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/middleware"
"github.com/coredns/coredns/middleware/erratic"
"github.com/coredns/coredns/middleware/kubernetes"
"github.com/mholt/caddy"
"github.com/miekg/dns"
)
func init() {
caddy.RegisterPlugin("autopath", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
ap, mw, err := autoPathParse(c)
if err != nil {
return middleware.Error("autopath", err)
}
// Do this in OnStartup, so all middleware has been initialized.
c.OnStartup(func() error {
m := dnsserver.GetConfig(c).Handler(mw)
if m == nil {
return nil
}
if x, ok := m.(*kubernetes.Kubernetes); ok {
ap.searchFunc = x.AutoPath
}
if x, ok := m.(*erratic.Erratic); ok {
ap.searchFunc = x.AutoPath
}
return nil
})
dnsserver.GetConfig(c).AddMiddleware(func(next middleware.Handler) middleware.Handler {
ap.Next = next
return ap
})
return nil
}
// allowedMiddleware has a list of middleware that can be used by autopath.
var allowedMiddleware = map[string]bool{
"@kubernetes": true,
"@erratic": true,
}
func autoPathParse(c *caddy.Controller) (*AutoPath, string, error) {
ap := &AutoPath{}
mw := ""
for c.Next() {
zoneAndresolv := c.RemainingArgs()
if len(zoneAndresolv) < 1 {
return ap, "", fmt.Errorf("no resolv-conf specified")
}
resolv := zoneAndresolv[len(zoneAndresolv)-1]
if resolv[0] == '@' {
_, ok := allowedMiddleware[resolv]
if ok {
mw = resolv[1:]
}
} else {
// assume file on disk
rc, err := dns.ClientConfigFromFile(resolv)
if err != nil {
return ap, "", fmt.Errorf("failed to parse %q: %v", resolv, err)
}
ap.search = rc.Search
middleware.Zones(ap.search).Normalize()
ap.search = append(ap.search, "") // sentinal value as demanded.
}
ap.Zones = zoneAndresolv[:len(zoneAndresolv)-1]
if len(ap.Zones) == 0 {
ap.Zones = make([]string, len(c.ServerBlockKeys))
copy(ap.Zones, c.ServerBlockKeys)
}
for i, str := range ap.Zones {
ap.Zones[i] = middleware.Host(str).Normalize()
}
}
return ap, mw, nil
}
|
