def configureBhaulInterface(essid):
"""Configure an interface to talk to an access point"""
try:
log_info("Configuring backhaul interface onto AP: %s" % essid)
# Take interface down
log_command("/sbin/ifdown %s 2>&1" % BACKHAUL_IFNAME)
# Write /etc/network/interfaces stanza
ifaces = debian_interfaces()
iface = ifaces[BACKHAUL_IFNAME]
iface["wpa-ssid"] = essid
ifaces[BACKHAUL_IFNAME] = iface
try:
remountrw("configureBhaulInterface")
ifaces.write()
finally:
remountro("configureBhaulInterface")
# Bring Up
log_command("/sbin/ifup %s 2>&1" % BACKHAUL_IFNAME)
ifaces = getInterfaces(returnOne=BACKHAUL_IFNAME)
if len(ifaces) != 1 or not ifaces[0]["up"]:
# Failed
log_error("Failed to configure and bring up backhaul " \
"interface (%s)" % BACKHAUL_IFNAME)
return False
return True
except:
log_error("Unexpected exception while configuring backhaul!",
sys.exc_info())
return False
def getBackhaulStatus():
"""Returns the status of the backhaul interface"""
nopeer = {"snr":0,"signal":0,"noise":0}
ifaces = getInterfaces(returnOne=BACKHAUL_IFNAME)
if len(ifaces) != 1:
return ("critical", "Backhaul interface not found", nopeer)
iface = ifaces[0]
wiface = iwtools.get_interface(BACKHAUL_IFNAME)
if not iface["up"]:
ifaces = debian_interfaces()
apname = ifaces[BACKHAUL_IFNAME]["wpa-ssid"].replace(ESSID_PREFIX, "")
return ("critical", "%s - Not associated" % apname, nopeer)
essid = wiface.get_essid()
if not essid.startswith(ESSID_PREFIX) and essid != "Any":
log_warn("Associated to invalid AP: %s" % essid)
return ("warning", "Not associated to correct Access Point", nopeer)
parts = essid.split("-")
stats = wiface.get_stats()
if getActiveUsername() != getISPUsername():
return ("warning", "Connected as '%s' not '%s'" % \
(getActiveUsername(), getISPUsername()), stats)
return ("ok", "%s" % "-".join(parts[1:]), stats)
def checkUpstream():
ifaces = debian_interfaces()
diface = ifaces[BACKHAUL_IFNAME]
if diface["wpa-ssid"] == "default":
# Not configured, scan for valid APs
try:
log_command("/sbin/ip link set up dev %s 2>&1" % BACKHAUL_IFNAME)
wiface = iwtools.get_interface(BACKHAUL_IFNAME)
scanres = wiface.scanall()
except:
log_error("Could not complete scan on backhaul interface (%s)!" % \
BACKHAUL_IFNAME, sys.exc_info())
scanres = []
# Exclude networks that don't match our ESSID
aps = [ n for n in scanres if n.essid.startswith(ESSID_PREFIX)]
# Pick the one with the highest SNR
best = None
for ap in aps:
if best is None or ap.qual["snr"] > best.qual["snr"]:
best = ap
# Select it
if best is not None:
log_info("Selecting Access Point '%s' based on SNR strength" % \
best.essid)
configureBhaulInterface(best.essid)
# Hope for the best
return
# Check that the backhaul is up
doUp = False
ifaces = getInterfaces(returnOne=BACKHAUL_IFNAME)
if len(ifaces) != 1:
ensureBackhaulUp()
return
iface = ifaces[0]
if not iface["up"]:
ensureBackhaulUp()
return
# Check credentials are up to date
if diface["wpa-identity"] != getActiveUsername() or \
diface["wpa-password"] != getActivePassword():
# Take down so that we re-authenticate
log_info("Triggering reassociation to update credentials")
log_command("/sbin/ifdown %s 2>&1" % BACKHAUL_IFNAME)
ensureBackhaulUp()
return
# Check IP layer is OK
dg = getGatewayIP()
if dg == "":
log_info("Triggering reassociation to acquire gateway")
log_command("/sbin/ifdown %s 2>&1" % BACKHAUL_IFNAME)
ensureBackhaulUp()
return
def setISPDetails(username, password):
try:
# Write /etc/network/interfaces stanza
ifaces = debian_interfaces()
iface = ifaces[BACKHAUL_IFNAME]
iface["wpa-identity"] = username
iface["wpa-password"] = password
ifaces[BACKHAUL_IFNAME] = iface
try:
remountrw("setISPDetails")
ifaces.write()
finally:
remountro("setISPDetails")
return True
except:
log_error("Unexpected exception while configuring ISP details!",
sys.exc_info())
return False
def getISPPassword():
"""Returns the currently configured ISP Password"""
ifaces = debian_interfaces()
return ifaces[BACKHAUL_IFNAME]["wpa-password"]
def getISPUsername():
"""Returns the currently configured ISP Username"""
ifaces = debian_interfaces()
return ifaces[BACKHAUL_IFNAME]["wpa-identity"]
