From d7460a8bd3b2fd106957434e2c1ae5135f72fddd Mon Sep 17 00:00:00 2001
From: Ted Trask <ttrask01@yahoo.com>
Date: Tue, 1 Jan 2013 15:48:13 +0000
Subject: Replaced io.popen with modelfunctions.run_executable and
 subprocess.popen

---
 chrony-model.lua | 48 +++++++++++++++++++++++++++++-------------------
 1 file changed, 29 insertions(+), 19 deletions(-)

diff --git a/chrony-model.lua b/chrony-model.lua
index 0bc53d5..d63ec63 100644
--- a/chrony-model.lua
+++ b/chrony-model.lua
@@ -6,6 +6,8 @@ format = require("acf.format")
 fs = require("acf.fs")
 validator = require("acf.validator")
 processinfo = require("acf.processinfo")
+require("subprocess")
+require("posix")
 
 -- Set variables
 local configfile = "/etc/chrony/chrony.conf"
@@ -89,13 +91,30 @@ function startstop_service(self, startstop, action)
 			if not password then
 				startstop.errtxt = "Could not find password in key file"
 			else
-				local cmd = path.."chronyc <<EOF\npassword "..format.escapespecialcharacters(password).."\n"..lower.."\nEOF"
-				local f = io.popen(cmd)
-				startstop.descr = f:read("*a") or ""
-				f:close()
-				if (startstop.descr == "") then
-					startstop.descr = nil
-					startstop.errtxt = "Command failed"
+       				local res, err = pcall(function()
+					-- For security, set the path
+					posix.setenv("PATH", "/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin")
+				
+					local args = {"chronyc", "-m", "password", lower}
+					args.stdin = subprocess.PIPE
+					args.stdout = subprocess.PIPE
+					args.stderr = "/dev/null"
+					local proc, errmsg, errno = subprocess.popen(args)
+					if proc then
+						proc.stdin:write(password.."\n")
+						proc.stdin:close()
+						proc:wait()
+						startstop.descr = proc.stdout:read("*a")
+						if proc.exitcode ~= 0 then
+							startstop.errtxt = startstop.descr
+							startstop.descr = nil
+						end
+					else
+						startstop.errtxt = errmsg or "Unknown failure"
+					end
+				end)
+				if not res or err then
+					startstop.errtxt = err or "Unknown failure"
 				end
 			end
 		end
@@ -118,18 +137,9 @@ function getdetails()
 
 	local pid = processinfo.pidof(processname)
 	if pid and #pid > 0 then
-		local cmd = path.."chronyc sources"
-		local f = io.popen(cmd)
-		details.sources.value = f:read("*a") or ""
-		f:close()
-		cmd = path.."chronyc sourcestats"
-		f = io.popen(cmd)
-		details.sourcestats.value = f:read("*a") or ""
-		f:close()
-		cmd = path.."chronyc tracking"
-		f = io.popen(cmd)
-		details.tracking.value = f:read("*a") or ""
-		f:close()
+		details.sources.value, details.sources.errtxt = modelfunctions.run_executable({"chronyc", "sources"})
+		details.sourcestats.value, details.sourcestats.errtxt = modelfunctions.run_executable({"chronyc", "sourcestats"})
+		details.tracking.value, details.tracking.errtxt = modelfunctions.run_executable({"chronyc", "tracking"})
 	end
 
 	return cfe({ type="group", value=details, label="Chrony Status Details" })
-- 
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