#!/usr/bin/python3
-import time, socket, os, stat
+import time, socket, os, stat, atexit, errno, struct, pwd
+from libtuer import log
from datetime import datetime
import RPi.GPIO as GPIO
+SO_PEERCRED = 17 # DO - NOT - TOUCH
GPIO.setmode(GPIO.BOARD)
-
-def log (what):
- print (datetime.now(),what)
-
+atexit.register(GPIO.cleanup)
+
+#tmp
+def recv_timeout(conn, size, time):
+ (r, w, x) = select.select([conn], [], [], time)
+ if len(r):
+ assert r[0] == conn
+ return conn.recv(size)
+ return None
+
+# ******** definitions *********
+# send to client for information but don't care if it arrives
def waynesend (conn, what):
try:
conn.send(what)
except:
log("Couldn't send %s" % str(what))
+# for command not found: do nothing with the pins and send a "0" to the client
+def doNothing (conn):
+ log ("doing nothing")
+ waynesend(conn,b"0")
+ pass
+
+# delete a file, don't care if it did not exist in the first place
+def forcerm(name):
+ try:
+ os.unlink (name)
+ except OSError as e:
+ # only ignore error if it was "file didn't exist"
+ if e.errno != errno.ENOENT:
+ raise
+
+# commands: on a pin do a series of timed on/off switches
class Pinoutput:
- # actionsanddelays is a list of pairs: (bool to send, delay in seconds to wait afterwards)
+ # name is for logging and also used for mapping command names to instances of this class
+ # actionsanddelays is a list of pairs: (bool to set on pin, delay in seconds to wait afterwards)
def __init__ (self, name, pinnumber, actionsanddelays):
self.name = name
self.pin = pinnumber
self.todo = actionsanddelays
GPIO.setup(pinnumber, GPIO.OUT)
log ("Pin %d set to be an output pin for %s." % (pinnumber,name))
-
+ # actually send the signal to the pins
def __call__ (self, conn):
for (value,delay) in self.todo:
GPIO.output(self.pin, value)
- log ("%s: Pin %d set to %s." % (self.name,self.pin,str(value)))
+ # log ("%s: Pin %d set to %s." % (self.name,self.pin,str(value)))
time.sleep(delay)
+ # notify success
+ log
waynesend(conn,b"1")
-tuergroupid = 1005
+# ******** configuration *********
+tuergroupid = 1005
+socketname = "/run/tuer.sock"
pinlist = [Pinoutput("open", 12, [(True, 0.3), (False, 5.0)]),
Pinoutput("close", 16, [(True, 0.3), (False, 5.0)]),
- Pinoutput("buzz", 22, [(True, 2.0), (False, 5.0)])]
-
-socketname = "/run/tuer.sock"
+ Pinoutput("buzz", 22, [(True, 2.0), (False, 0.1)])]
-def doNothing (conn):
- log ("doing nothing")
- waynesend(conn,b"0")
- pass
+# ******** main *********
+# convert list of pin objects to dictionary for command lookup
+pindict = {}
+for pin in pinlist:
+ pindict[pin.name.encode()] = pin
+# create socket
sock = socket.socket (socket.AF_UNIX, socket.SOCK_STREAM)
-
-try:
- os.unlink (socketname)
-except OSError:
- pass
-
+# delete old socket file and don't bitch around if it's not there
+forcerm(socketname)
+# bind socket to file name
sock.bind (socketname)
-
+# allow only users in the tuergroup to write to the socket
os.chown (socketname, 0, tuergroupid)
os.chmod (socketname, stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IWGRP)
-
+# listen to the people, but not too many at once
sock.listen(1)
-pindict = {}
-for pin in pinlist:
- pindict[pin.name.encode()] = pin
+# shutdown handling
+def shutdown():
+ log("Shutting down")
+ sock.close()
+ forcerm(socketname)
+atexit.register(shutdown)
+# main loop
+# FIXME: DoS by opening socket but not sending data, because this loop is single threaded; maybe settimeout helps a bit.
while True:
+ # accept connections
conn, addr = sock.accept()
- data = conn.recv (128)
- log("received command: %s" % str(data))
- pindict.get(data,doNothing)(conn)
- conn.close()
-
-GPIO.cleanup()
-
+ try:
+ # get peer information
+ (pid, uid, gid) = (struct.unpack('3i', conn.getsockopt(socket.SOL_SOCKET, SO_PEERCRED, struct.calcsize('3i'))))
+ # get some data from the client (enough to hold any valid command)
+ data = conn.recv (32)
+ # log the command
+ log("received command from %s (uid %d): %s" % (pwd.getpwuid(uid).pw_name,uid, str(data)))
+ # lookup the command, if it's not in the dict, use the doNothing function instead
+ # and execute the looked up command or doNothing with the connection, so it can respond to the client
+ pindict.get(data,doNothing)(conn)
+ log("done")
+ # close connection cleanly
+ conn.close()
+ except Exception as e:
+ log("Something went wrong: %s\n...continuing." % str(e))
projects / saartuer.git / blobdiff