[ufp v2] ufp: write oui info to ieee-oui.txt

[Christian Korber]

This commit writes connected device's information (oui and vendor) to
ieee-oui.txt for arp-scan if export is set to true.
This way there is no unneccessary big file on the target.

CHANGE to v1: corrected the patch for upstream and included an option
`export` to choose if it is activated.

Signed-off-by: Christian Korber <ckorber at tdt.de>
---
 ufpd | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 52 insertions(+), 2 deletions(-)

diff --git a/ufpd b/ufpd
index c41ab8c..da988ac 100755
--- a/ufpd
+++ b/ufpd
@@ -3,7 +3,7 @@
 import * as uloop from "uloop";
 import * as libubus from "ubus";
 import * as unetmsg from "unetmsg.client";
-import { readfile, glob, basename } from "fs";
+import { readfile, glob, basename, open, stat, mkdir } from "fs";
 let uht = require("uht");
 push(REQUIRE_SEARCH_PATH, "/usr/share/ufp/*.uc");
 
@@ -365,7 +365,8 @@ global.ubus_object = {
 			macaddr: "",
 			ubus_rpc_session: "",
 			weight: false,
-			local: false
+			local: false,
+			export: false
 		},
 		call: function(req) {
 			refresh_plugins();
@@ -373,6 +374,7 @@ global.ubus_object = {
 			let cur_devices = network_devices(req.args.local);
 			let mac_list = req.args.macaddr ? [ req.args.macaddr ] : keys(cur_devices);
 			let ret = {};
+			let to_file = req.args.export;
 
 			for (let mac in mac_list) {
 				let match_list = device_match_list(mac, cur_devices);
@@ -398,6 +400,54 @@ global.ubus_object = {
 				}
 			}
 
+			/*
+			 * We want to populate ieee-oui.txt in order to
+			 * use it for arp-scan. This way we don't need a
+			 * large file too big in size, but rather rely on
+			 * found data via ubus call 'fingerprint'.
+			 * ieee-oui.txt will be updated on every call to:
+			 * `ubus call fingerprint fingerprint`.
+			 */
+
+			if(to_file) {
+				const tmp_dir = '/tmp/arp-scan';
+				const ieee_file = sprintf('%s/ieee-oui.txt', tmp_dir);
+				let ouis_added = [];
+
+				if (!stat(tmp_dir))
+					mkdir(tmp_dir);
+
+				const fd = open(ieee_file, 'a+');
+
+				/*
+				* check for duplicate ouis
+				*/
+				for (let line = fd.read('line'); length(line); line = fd.read('line')) {
+					let oui = split(line, '\t')[0];
+					oui = uc(oui);
+
+					if (index(ouis_added, oui) < 0)
+						push(ouis_added, oui);
+				}
+
+				/*
+				* write to ieee-oui.txt
+				*/
+				for (let entry in ret) {
+					let vendor = ret[entry].vendor;
+					let oui = split(entry, ':');
+					oui = join('', slice(oui, 0,3));
+					oui = uc(oui);
+
+					if (index(ouis_added, oui) < 0) {
+						let line = sprintf('%s\t%s\n', oui, vendor);
+						fd.write(line);
+					}
+				}
+
+				fd.close();
+			}
+
 			return req.args.macaddr ? ret[req.args.macaddr] : ret;
 		}
 	},
-- 
2.47.3
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