Add OpenBGPd format ROA output

API.md

@@ -313,7 +313,7 @@ The token is set using the `--AuthToken` command line parameter.
 ## Route Origin Authorisation (ROA) API
 
 Route Origin Authorisation (ROA) data can be obtained from the server in
-JSON and bird formats.
+JSON, bird and OpenBGPd formats.
 
 ### JSON format output
 
@@ -414,6 +414,69 @@ route fd42:7879:7879::/48 max 64 as 4242421787;
 ... and so on
 ```
 
+### OpenBGPd format output
+
+```
+GET /api/roa/obgpd/{IP family}
+```
+
+Provides ROA data suitable for including in to OpenBGPd.
+
+{IP family} can be 4, 6 or 46 to provide both IPv4 and IPv6 results
+
+
+Example Output:
+```
+wget -O - -q http://localhost:8042/api/roa/obgpd/4
+```
+
+```
+#
+# dn42regsrv ROA Generator
+# Last Updated: 2021-05-19 12:54:44.441996393 +0100 BST m=+5.976816481
+# Commit: 8b96b02aa4c2f02b3a3e64c8458bc76596b6345c
+#
+roa-set {
+  172.20.34.0/26 maxlen 29 source-as 4242423966
+  172.20.58.0/27 maxlen 29 source-as 4242420237
+  10.132.0.0/16 maxlen 24 source-as 65132
+
+...
+
+  172.23.222.160/28 maxlen 29 source-as 4242423626
+  172.20.54.32/28 maxlen 29 source-as 4242422274
+  172.20.172.0/28 maxlen 29 source-as 4242423160
+}
+```
+
+```
+wget -O - -q http://localhost:8042/api/roa/obgpd/46
+```
+
+```
+#
+# dn42regsrv ROA Generator
+# Last Updated: 2021-05-19 12:54:44.441996393 +0100 BST m=+5.976816481
+# Commit: 8b96b02aa4c2f02b3a3e64c8458bc76596b6345c
+#
+roa-set {
+  172.20.34.0/26 maxlen 29 source-as 4242423966
+  172.20.58.0/27 maxlen 29 source-as 4242420237
+ 
+... IPv4 ROA
+
+  172.20.54.32/28 maxlen 29 source-as 4242422274
+  172.20.172.0/28 maxlen 29 source-as 4242423160
+  fd35:eeee:eeee::/48 maxlen 64 source-as 4242422006
+  fd88:ee35:b221::/48 maxlen 48 source-as 4242423679
+
+... IPv6 ROA
+
+  fda3:ea2d:b60a::/48 maxlen 48 source-as 4242420228
+  fdfd:dead:c0de::/64 maxlen 64 source-as 4242421230
+}
+```
+
 ### filter{,6}.txt
 
 ```

roaapi.go

@@ -94,6 +94,7 @@ func InitROAAPI(params ...interface{}) {
 	s.HandleFunc("/filter/{ipv}", roaFilterHandler)
 	s.HandleFunc("/json", roaJSONHandler)
 	s.HandleFunc("/bird/{birdv}/{ipv}", roaBirdHandler)
+	s.HandleFunc("/obgpd/{ipv}", roaOBGPdHandler)
 
 	log.Info("ROA API installed")
 }
@@ -195,6 +196,43 @@ func roaBirdHandler(w http.ResponseWriter, r *http.Request) {
 
 }
 
+// return the roa in OpenBGPd format
+func roaOBGPdHandler(w http.ResponseWriter, r *http.Request) {
+
+	vars := mux.Vars(r)
+	ipv := vars["ipv"]
+
+	// select ROA to emit
+	var roa []*PrefixROA
+	if strings.ContainsRune(ipv, '4') {
+		roa = append(roa, ROAData.IPv4...)
+	}
+	if strings.ContainsRune(ipv, '6') {
+		roa = append(roa, ROAData.IPv6...)
+	}
+
+	w.Header().Set("Content-Type", "text/plain")
+	w.Header().Set("Access-Control-Allow-Origin", "*")
+
+	// cache for up to a week, but set etag to commit to catch changes
+	w.Header().Set("Cache-Control", "public, max-age=7200, stale-if-error=604800")
+	w.Header().Set("ETag", ROAData.Commit)
+
+	// add header
+	fmt.Fprintf(w, "#\n# dn42regsrv ROA Generator\n# Last Updated: %s\n"+
+		"# Commit: %s\n#\nroa-set {\n", ROAData.CTime.String(), ROAData.Commit)
+
+	// output the ROA
+	format := "  %s maxlen %d source-as %s\n"
+	for _, r := range roa {
+		fmt.Fprintf(w, format, r.Prefix, r.MaxLen, r.ASN[2:])
+	}
+
+	// add tail
+	fmt.Fprintf(w, "}\n")
+
+}
+
 //////////////////////////////////////////////////////////////////////////
 // called whenever the registry is updated