Make the IPA installer IPv6 friendly

Notable changes include:
 * parse AAAA records in dnsclient
 * also ask for AAAA records when verifying FQDN
 * do not use functions that are not IPv6 aware - notably socket.gethostbyname()
   The complete list of functions was taken from http://www.akkadia.org/drepper/userapi-ipv6.html
   section "Interface Checklist"

3 files changed, 41 insertions, 28 deletions

diff --git a/install/tools/ipa-dns-install b/install/tools/ipa-dns-install
index bf6679e38..a91938f9e 100755
--- a/install/tools/ipa-dns-install
+++ b/install/tools/ipa-dns-install
@@ -62,16 +62,19 @@ def parse_options():
 def resolve_host(host_name):
     ip = None
     try:
-        ip = socket.gethostbyname(host_name)
-
-        if ip == "127.0.0.1" or ip == "::1":
-            print "The hostname resolves to the localhost address (127.0.0.1/::1)"
-            print "Please change your /etc/hosts file so that the hostname"
-            print "resolves to the ip address of your network interface."
-            print ""
-            print "Please fix your /etc/hosts file and restart the setup program"
-            return None
-
+        addrinfos = socket.getaddrinfo(host_name, None,
+                                       socket.AF_UNSPEC, socket.SOCK_DGRAM)
+        for ai in addrinfos:
+            ip = ai[4][0]
+            if ip == "127.0.0.1" or ip == "::1":
+                print "The hostname resolves to the localhost address (127.0.0.1/::1)"
+                print "Please change your /etc/hosts file so that the hostname"
+                print "resolves to the ip address of your network interface."
+                print ""
+                print "Please fix your /etc/hosts file and restart the setup program"
+                return None
+
+        ip = addrinfos[0][4][0]
     except:
         print "Unable to lookup the IP address of the provided host"
     return ip
diff --git a/install/tools/ipa-replica-install b/install/tools/ipa-replica-install
index 0826afa59..906a098d2 100755
--- a/install/tools/ipa-replica-install
+++ b/install/tools/ipa-replica-install
@@ -127,12 +127,17 @@ def get_host_name(no_host_dns):
     return hostname
 
 def resolve_host(host_name):
-    ip = socket.gethostbyname(host_name)
-
-    if ip == "127.0.0.1" or ip == "::1":
-        raise HostnameLocalhost
-
-    return ip
+    try:
+        addrinfos = socket.getaddrinfo(host_name, None,
+                                       socket.AF_UNSPEC, socket.SOCK_STREAM)
+        for ai in addrinfos:
+            ip = ai[4][0]
+            if ip == "127.0.0.1" or ip == "::1":
+                raise HostnameLocalhost
+
+        return addrinfos[0][4][0]
+    except:
+        return None
 
 def set_owner(config, dir):
     pw = pwd.getpwnam(config.ds_user)
@@ -240,6 +245,8 @@ def install_bind(config, options):
         forwarders = ()
     bind = bindinstance.BindInstance(dm_password=config.dirman_password)
     ip_address = resolve_host(config.host_name)
+    if not ip_address:
+        sys.exit("Unable to resolve IP address for host name")
     create_reverse = bindinstance.create_reverse(options.unattended)
     bind.setup(config.host_name, ip_address, config.realm_name,
                config.domain_name, forwarders, options.conf_ntp, create_reverse)
diff --git a/install/tools/ipa-server-install b/install/tools/ipa-server-install
index 5b9e65216..774e87fdf 100755
--- a/install/tools/ipa-server-install
+++ b/install/tools/ipa-server-install
@@ -279,19 +279,22 @@ def read_host_name(host_default,no_host_dns=False):
     return host_name
 
 def resolve_host(host_name):
-    ip = ""
+    ip = None
     try:
-        ip = socket.gethostbyname(host_name)
-
-        if ip == "127.0.0.1" or ip == "::1":
-            print "The hostname resolves to the localhost address (127.0.0.1/::1)"
-            print "Please change your /etc/hosts file so that the hostname"
-            print "resolves to the ip address of your network interface."
-            print "The KDC service does not listen on localhost"
-            print ""
-            print "Please fix your /etc/hosts file and restart the setup program"
-            return None
+        addrinfos = socket.getaddrinfo(host_name, None,
+                                       socket.AF_UNSPEC, socket.SOCK_DGRAM)
+        for ai in addrinfos:
+            ip = ai[4][0]
+            if ip == "127.0.0.1" or ip == "::1":
+                print "The hostname resolves to the localhost address (127.0.0.1/::1)"
+                print "Please change your /etc/hosts file so that the hostname"
+                print "resolves to the ip address of your network interface."
+                print "The KDC service does not listen on localhost"
+                print ""
+                print "Please fix your /etc/hosts file and restart the setup program"
+                return None
 
+        ip = addrinfos[0][4][0]
     except:
         print "Unable to lookup the IP address of the provided host"
     return ip
@@ -549,7 +552,7 @@ def main():
             sys.exit("Aborting installation")
 
     # check the hostname is correctly configured, it must be as the kldap
-    # utilities just use the hostname as returned by gethostbyname to set
+    # utilities just use the hostname as returned by getaddrinfo to set
     # up some of the standard entries
 
     host_default = ""