update

1 files changed, 75 insertions, 8 deletions

diff --git a/bin/clipd b/bin/clipd
index ae04207..6c6d40e 100755
--- a/bin/clipd
+++ b/bin/clipd
@@ -4,6 +4,15 @@
 -- luarocks-5.3 install --local luaposix
 -- luarocks-5.3 install --local argparse
 -- cat .clip_history | dmenu -l 10 | xsel -ib
+local string = require("string")
+local signal = require("posix.signal")
+local argparse = require("argparse")
+local sys_stat = require("posix.sys.stat")
+local unistd_getuid = require("posix.unistd.getuid")
+local unistd_getgid = require("posix.unistd.getgid")
+local unistd_getpid = require("posix.unistd.getpid")
+local posix_syslog = require("posix.syslog")
+
 local function default_luarocks_modules()
     local luarocks_handle = io.popen("luarocks-5.3 path --bin")
     local path_b = false
@@ -24,12 +33,6 @@ local function default_luarocks_modules()
 end
 default_luarocks_modules()
 
-local string = require("string")
-local signal = require("posix.signal")
-local argparse = require("argparse")
-
-signal.signal(signal.SIGINT, function(signum) os.exit(128 + signum) end)
-
 local function sleep(n) os.execute("sleep " .. tonumber(n)) end
 local function trim(s) return s:gsub("^%s+", ""):gsub("%s+$", "") end
 
@@ -38,6 +41,60 @@ parser:option("-s --hist_size", "history file size", 200)
 parser:option("-f --hist_file", "history file location",
               "/home/devi/.clip_history")
 
+local function log_to_syslog(log_str, log_priority)
+    posix_syslog.openlog("clipd",
+                         posix_syslog.LOG_NDELAY | posix_syslog.LOG_PID,
+                         posix_syslog.LOG_LOCAL0)
+    posix_syslog.syslog(log_priority, log_str)
+    posix_syslog.closelog()
+end
+
+local function check_clip_hist_perms(clip_hist)
+    local uid = unistd_getuid()
+    local gid = unistd_getgid()
+    for k, v in pairs(sys_stat.stat(clip_hist)) do
+        if k == "st_uid" then
+            if v ~= uid then
+                log_to_syslog(
+                    "clipboard history file owned by uid other than the clipd uid",
+                    posix_syslog.LOG_CRIT)
+                os.exit(1)
+            end
+        end
+        if k == "st_gid" then
+            if v ~= gid then
+                log_to_syslog(
+                    "clipboard history file owned by gid other than the clipd gid",
+                    posix_syslog.LOG_CRIT)
+                os.exit(1)
+            end
+        end
+        if k == "st_mode" then
+            if v & sys_stat.S_IRWXU ~= 0 then
+                log_to_syslog(
+                    "file permissions are too open. they need to be 0600.",
+                    posix_syslog.LOG_CRIT)
+                os.exit(1)
+            end
+        end
+    end
+end
+
+local function check_pid_file()
+    local f = sys_stat("/var/run/clipd.pid")
+    if f ~= nil then
+        log_to_syslog("clipd is already running", posix_syslog.LOG_CRIT)
+        os.exit(1)
+    end
+end
+
+local function write_pid_file()
+    local f = io.open("/var/run/clipd.pid")
+    f.write(unistd_getpid())
+end
+
+local function remove_pid_file() end
+
 local function loop(clip_hist, clip_hist_size)
     local clips_table = {}
     local hist_current_count = 0
@@ -83,5 +140,15 @@ local function loop(clip_hist, clip_hist_size)
     end
 end
 
-local args = parser:parse()
-loop(args["hist_file"], args["hist_size"])
+local function main()
+    signal.signal(signal.SIGINT, function(signum) os.exit(128 + signum) end)
+    local args = parser:parse()
+    check_clip_hist_perms(args["hist_file"])
+    check_pid_file()
+    write_pid_file()
+    local status, err = pcall(loop(args["hist_file"], args["hist_size"]))
+    if ~status then log_to_syslog(err, posix_syslog.LOG_CRIT) end
+    remove_pid_file()
+end
+
+main()