#!/usr/bin/env python
import re
import os
import random
from moulinette.utils.network import download_text
from moulinette.utils.process import check_output
from moulinette.utils.filesystem import read_file
from yunohost.diagnosis import Diagnoser
from yunohost.utils.network import get_network_interfaces
class IPDiagnoser(Diagnoser):
id_ = os.path.splitext(os.path.basename(__file__))[0].split("-")[1]
cache_duration = 600
dependencies = []
def run(self):
# ############################################################ #
# PING : Check that we can ping outside at least in ipv4 or v6 #
# ############################################################ #
can_ping_ipv4 = self.can_ping_outside(4)
can_ping_ipv6 = self.can_ping_outside(6)
if not can_ping_ipv4 and not can_ping_ipv6:
yield dict(meta={"test": "ping"},
status="ERROR",
summary="diagnosis_ip_not_connected_at_all")
# Not much else we can do if there's no internet at all
return
# ###################################################### #
# DNS RESOLUTION : Check that we can resolve domain name #
# (later needed to talk to ip. and ip6.yunohost.org) #
# ###################################################### #
can_resolve_dns = self.can_resolve_dns()
# In every case, we can check that resolvconf seems to be okay
# (symlink managed by resolvconf service + pointing to dnsmasq)
good_resolvconf = self.good_resolvconf()
# If we can't resolve domain names at all, that's a pretty big issue ...
# If it turns out that at the same time, resolvconf is bad, that's probably
# the cause of this, so we use a different message in that case
if not can_resolve_dns:
yield dict(meta={"test": "dnsresolv"},
status="ERROR",
summary="diagnosis_ip_broken_dnsresolution" if good_resolvconf else "diagnosis_ip_broken_resolvconf")
return
# Otherwise, if the resolv conf is bad but we were able to resolve domain name,
# still warn that we're using a weird resolv conf ...
elif not good_resolvconf:
yield dict(meta={"test": "dnsresolv"},
status="WARNING",
summary="diagnosis_ip_weird_resolvconf",
details=["diagnosis_ip_weird_resolvconf_details"])
else:
yield dict(meta={"test": "dnsresolv"},
status="SUCCESS",
summary="diagnosis_ip_dnsresolution_working")
# ##################################################### #
# IP DIAGNOSIS : Check that we're actually able to talk #
# to a web server to fetch current IPv4 and v6 #
# ##################################################### #
ipv4 = self.get_public_ip(4) if can_ping_ipv4 else None
ipv6 = self.get_public_ip(6) if can_ping_ipv6 else None
network_interfaces = get_network_interfaces()
def get_local_ip(version):
local_ip = {iface: addr[version].split("/")[0]
for iface, addr in network_interfaces.items() if version in addr}
if not local_ip:
return None
elif len(local_ip):
return next(iter(local_ip.values()))
else:
return local_ip
yield dict(meta={"test": "ipv4"},
data={"global": ipv4, "local": get_local_ip("ipv4")},
status="SUCCESS" if ipv4 else "ERROR",
summary="diagnosis_ip_connected_ipv4" if ipv4 else "diagnosis_ip_no_ipv4",
details=["diagnosis_ip_global", "diagnosis_ip_local"] if ipv4 else None)
yield dict(meta={"test": "ipv6"},
data={"global": ipv6, "local": get_local_ip("ipv6")},
status="SUCCESS" if ipv6 else "WARNING",
summary="diagnosis_ip_connected_ipv6" if ipv6 else "diagnosis_ip_no_ipv6",
details=["diagnosis_ip_global", "diagnosis_ip_local"] if ipv6 else ["diagnosis_ip_no_ipv6_tip"])
# TODO / FIXME : add some attempt to detect ISP (using whois ?) ?
def can_ping_outside(self, protocol=4):
assert protocol in [4, 6], "Invalid protocol version, it should be either 4 or 6 and was '%s'" % repr(protocol)
# We can know that ipv6 is not available directly if this file does not exists
if protocol == 6 and not os.path.exists("/proc/net/if_inet6"):
return False
# If we are indeed connected in ipv4 or ipv6, we should find a default route
routes = check_output("ip -%s route show table all" % protocol).split("\n")
def is_default_route(r):
# Typically the default route starts with "default"
# But of course IPv6 is more complex ... e.g. on internet cube there's
# no default route but a /3 which acts as a default-like route...
# e.g. 2000:/3 dev tun0 ...
return r.startswith("default") or (":" in r and re.match(r".*/[0-3]$", r.split()[0]))
if not any(is_default_route(r) for r in routes):
self.logger_debug("No default route for IPv%s, so assuming there's no IP address for that version" % protocol)
return None
# We use the resolver file as a list of well-known, trustable (ie not google ;)) IPs that we can ping
resolver_file = "/usr/share/yunohost/templates/dnsmasq/plain/resolv.dnsmasq.conf"
resolvers = [r.split(" ")[1] for r in read_file(resolver_file).split("\n") if r.startswith("nameserver")]
if protocol == 4:
resolvers = [r for r in resolvers if ":" not in r]
if protocol == 6:
resolvers = [r for r in resolvers if ":" in r]
assert resolvers != [], "Uhoh, need at least one IPv%s DNS resolver in %s ..." % (protocol, resolver_file)
# So let's try to ping the first 4~5 resolvers (shuffled)
# If we succesfully ping any of them, we conclude that we are indeed connected
def ping(protocol, target):
return os.system("ping%s -c1 -W 3 %s >/dev/null 2>/dev/null" % ("" if protocol == 4 else "6", target)) == 0
random.shuffle(resolvers)
return any(ping(protocol, resolver) for resolver in resolvers[:5])
def can_resolve_dns(self):
return os.system("dig +short ip.yunohost.org >/dev/null 2>/dev/null") == 0
def good_resolvconf(self):
content = read_file("/etc/resolv.conf").strip().split("\n")
# Ignore comments and empty lines
content = [l.strip() for l in content if l.strip() and not l.strip().startswith("#") and not l.strip().startswith("search")]
# We should only find a "nameserver 127.0.0.1"
return len(content) == 1 and content[0].split() == ["nameserver", "127.0.0.1"]
def get_public_ip(self, protocol=4):
# FIXME - TODO : here we assume that DNS resolution for ip.yunohost.org is working
# but if we want to be able to diagnose DNS resolution issues independently from
# internet connectivity, we gotta rely on fixed IPs first....
assert protocol in [4, 6], "Invalid protocol version, it should be either 4 or 6 and was '%s'" % repr(protocol)
url = 'https://ip%s.yunohost.org' % ('6' if protocol == 6 else '')
try:
return download_text(url, timeout=30).strip()
except Exception as e:
self.logger_debug("Could not get public IPv%s : %s" % (str(protocol), str(e)))
return None
def main(args, env, loggers):
return IPDiagnoser(args, env, loggers).diagnose()