diff options
Diffstat (limited to 'plugin/erratic/setup.go')
-rw-r--r-- | plugin/erratic/setup.go | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/plugin/erratic/setup.go b/plugin/erratic/setup.go new file mode 100644 index 000000000..b0a56927d --- /dev/null +++ b/plugin/erratic/setup.go @@ -0,0 +1,117 @@ +package erratic + +import ( + "fmt" + "strconv" + "time" + + "github.com/coredns/coredns/core/dnsserver" + "github.com/coredns/coredns/plugin" + + "github.com/mholt/caddy" +) + +func init() { + caddy.RegisterPlugin("erratic", caddy.Plugin{ + ServerType: "dns", + Action: setupErratic, + }) +} + +func setupErratic(c *caddy.Controller) error { + e, err := parseErratic(c) + if err != nil { + return plugin.Error("erratic", err) + } + + dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler { + return e + }) + + return nil +} + +func parseErratic(c *caddy.Controller) (*Erratic, error) { + e := &Erratic{drop: 2} + drop := false // true if we've seen the drop keyword + + for c.Next() { // 'erratic' + for c.NextBlock() { + switch c.Val() { + case "drop": + args := c.RemainingArgs() + if len(args) > 1 { + return nil, c.ArgErr() + } + + if len(args) == 0 { + continue + } + + amount, err := strconv.ParseInt(args[0], 10, 32) + if err != nil { + return nil, err + } + if amount < 0 { + return nil, fmt.Errorf("illegal amount value given %q", args[0]) + } + e.drop = uint64(amount) + drop = true + case "delay": + args := c.RemainingArgs() + if len(args) > 2 { + return nil, c.ArgErr() + } + + // Defaults. + e.delay = 2 + e.duration = 100 * time.Millisecond + if len(args) == 0 { + continue + } + + amount, err := strconv.ParseInt(args[0], 10, 32) + if err != nil { + return nil, err + } + if amount < 0 { + return nil, fmt.Errorf("illegal amount value given %q", args[0]) + } + e.delay = uint64(amount) + + if len(args) > 1 { + duration, err := time.ParseDuration(args[1]) + if err != nil { + return nil, err + } + e.duration = duration + } + case "truncate": + args := c.RemainingArgs() + if len(args) > 1 { + return nil, c.ArgErr() + } + + if len(args) == 0 { + continue + } + + amount, err := strconv.ParseInt(args[0], 10, 32) + if err != nil { + return nil, err + } + if amount < 0 { + return nil, fmt.Errorf("illegal amount value given %q", args[0]) + } + e.truncate = uint64(amount) + default: + return nil, c.Errf("unknown property '%s'", c.Val()) + } + } + } + if (e.delay > 0 || e.truncate > 0) && !drop { // delay is set, but we've haven't seen a drop keyword, remove default drop stuff + e.drop = 0 + } + + return e, nil +} |