1 files changed, 141 insertions, 0 deletions
diff --git a/middleware/log/setup.go b/middleware/log/setup.go
new file mode 100644
index 000000000..a80e69ac3
--- /dev/null
+++ b/middleware/log/setup.go
@@ -0,0 +1,141 @@
+package log
+
+import (
+	"io"
+	"log"
+	"os"
+
+	"github.com/miekg/coredns/core/dnsserver"
+	"github.com/miekg/coredns/middleware"
+	"github.com/miekg/coredns/server"
+
+	"github.com/hashicorp/go-syslog"
+	"github.com/mholt/caddy"
+	"github.com/miekg/dns"
+)
+
+func init() {
+	caddy.RegisterPlugin("log", caddy.Plugin{
+		ServerType: "dns",
+		Action:     setup,
+	})
+}
+
+func setup(c *caddy.Controller) error {
+	rules, err := logParse(c)
+	if err != nil {
+		return err
+	}
+
+	// Open the log files for writing when the server starts
+	c.OnStartup(func() error {
+		for i := 0; i < len(rules); i++ {
+			var err error
+			var writer io.Writer
+
+			if rules[i].OutputFile == "stdout" {
+				writer = os.Stdout
+			} else if rules[i].OutputFile == "stderr" {
+				writer = os.Stderr
+			} else if rules[i].OutputFile == "syslog" {
+				writer, err = gsyslog.NewLogger(gsyslog.LOG_INFO, "LOCAL0", "coredns")
+				if err != nil {
+					return err
+				}
+			} else {
+				var file *os.File
+				file, err = os.OpenFile(rules[i].OutputFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
+				if err != nil {
+					return err
+				}
+				if rules[i].Roller != nil {
+					file.Close()
+					rules[i].Roller.Filename = rules[i].OutputFile
+					writer = rules[i].Roller.GetLogWriter()
+				} else {
+					writer = file
+				}
+			}
+
+			rules[i].Log = log.New(writer, "", 0)
+		}
+
+		return nil
+	})
+
+	dnsserver.GetConfig(c).AddMiddleware(func(next dnsserver.Handler) dnsserver.Handler {
+		return Logger{Next: next, Rules: rules, ErrorFunc: server.DefaultErrorFunc}
+	})
+
+	return nil
+}
+
+func logParse(c *caddy.Controller) ([]Rule, error) {
+	var rules []Rule
+
+	for c.Next() {
+		args := c.RemainingArgs()
+
+		var logRoller *middleware.LogRoller
+		if c.NextBlock() {
+			if c.Val() == "rotate" {
+				if c.NextArg() {
+					if c.Val() == "{" {
+						var err error
+						logRoller, err = middleware.ParseRoller(c)
+						if err != nil {
+							return nil, err
+						}
+						// This part doesn't allow having something after the rotate block
+						if c.Next() {
+							if c.Val() != "}" {
+								return nil, c.ArgErr()
+							}
+						}
+					}
+				}
+			}
+		}
+		if len(args) == 0 {
+			// Nothing specified; use defaults
+			rules = append(rules, Rule{
+				NameScope:  ".",
+				OutputFile: DefaultLogFilename,
+				Format:     DefaultLogFormat,
+				Roller:     logRoller,
+			})
+		} else if len(args) == 1 {
+			// Only an output file specified
+			rules = append(rules, Rule{
+				NameScope:  ".",
+				OutputFile: args[0],
+				Format:     DefaultLogFormat,
+				Roller:     logRoller,
+			})
+		} else {
+			// Name scope, output file, and maybe a format specified
+
+			format := DefaultLogFormat
+
+			if len(args) > 2 {
+				switch args[2] {
+				case "{common}":
+					format = CommonLogFormat
+				case "{combined}":
+					format = CombinedLogFormat
+				default:
+					format = args[2]
+				}
+			}
+
+			rules = append(rules, Rule{
+				NameScope:  dns.Fqdn(args[0]),
+				OutputFile: args[1],
+				Format:     format,
+				Roller:     logRoller,
+			})
+		}
+	}
+
+	return rules, nil
+}