Add test that we can ping outside before talking to ip.yunohost.org

data/hooks/diagnosis/10-ip.py

@@ -1,9 +1,12 @@
 #!/usr/bin/env python
 
 import os
+import random
 
 from moulinette import m18n
 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
 
@@ -24,7 +27,12 @@ class IPDiagnoser(Diagnoser):
         versions = self.args["versions"]
 
         if 4 in versions:
+
+            if not self.can_ping_outside(4):
+                ipv4 = None
+            else:
                 ipv4 = self.get_public_ip(4)
+
             yield dict(meta = {"version": 4},
                        data = ipv4,
                        status = "SUCCESS" if ipv4 else "ERROR",
@@ -32,15 +40,57 @@ class IPDiagnoser(Diagnoser):
                             else ("diagnosis_network_no_ipv4", {}))
 
         if 6 in versions:
+
+            if not self.can_ping_outside(4):
+                ipv6 = None
+            else:
                 ipv6 = self.get_public_ip(6)
+
             yield dict(meta = {"version": 6},
                        data = ipv6,
                        status = "SUCCESS" if ipv6 else "WARNING",
                        summary = ("diagnosis_network_connected_ipv6", {}) if ipv6 \
                             else ("diagnosis_network_no_ipv6", {}))
 
+
+    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" % protocol).split("\n")
+        if not [r for r in routes if r.startswith("default")]:
+            return False
+
+        # 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 -c1 -%s -W 3 %s >/dev/null 2>/dev/null" % (protocol, target)) == 0
+
+        random.shuffle(resolvers)
+        return any(ping(protocol, resolver) for resolver in resolvers[:5])
+
     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....
+
         if protocol == 4:
             url = 'https://ip.yunohost.org'
         elif protocol == 6:

data/hooks/diagnosis/12-dnsrecords.py

@@ -79,6 +79,9 @@ class DNSRecordsDiagnoser(Diagnoser):
             command = "dig +short @%s %s %s" % (self.resolver, type_, domain)
         else:
             command = "dig +short @%s %s %s.%s" % (self.resolver, type_, name, domain)
+        # FIXME : gotta handle case where this command fails ...
+        # e.g. no internet connectivity (dependency mechanism to good result from 'ip' diagosis ?)
+        # or the resolver is unavailable for some reason
         output = check_output(command).strip()
         output = output.replace("\;",";")
         if output.startswith('"') and output.endswith('"'):

locales/en.json

@@ -159,8 +159,8 @@
     "diagnosis_network_no_ipv4": "The server does not have a working IPv4.",
     "diagnosis_network_connected_ipv6": "The server is connect to the Internet through IPv6 !",
     "diagnosis_network_no_ipv6": "The server does not have a working IPv6.",
-    "diagnosis_dns_good_conf": "Good DNS configuration for {domain} : {category}.",
+    "diagnosis_dns_good_conf": "Good DNS configuration for domain {domain} (category {category})",
-    "diagnosis_dns_bad_conf": "Bad DNS configuration for {domain} : {category}.",
+    "diagnosis_dns_bad_conf": "Bad DNS configuration for domain {domain} (category {category})",
     "diagnosis_dns_missing_record": "According to the recommended DNS configuration, you should add a DNS record with type {0}, name {1} and value {2}",
     "diagnosis_dns_discrepancy": "According to the recommended DNS configuration, the value for the DNS record with type {0} and name {1} should be {2}, not {3}.",
     "diagnosis_description_ip": "Internet connectivity",