improve hostname/IP default values

Merges branch 'mkropat-populate-hostname-ip'

Vagrantfile

@@ -18,7 +18,7 @@ Vagrant.configure("2") do |config|
 	# machine figure out its own public IP and it'll take a
 	# subdomain on our justtesting.email domain so we can get
 	# started quickly.
-    export PUBLIC_IP=auto-web
+    export PUBLIC_IP=auto
     export PUBLIC_HOSTNAME=auto-easy
     export CSR_COUNTRY=US
 

setup/functions.sh

@@ -19,6 +19,51 @@ function apt_install {
 	DEBIAN_FRONTEND=noninteractive apt-get -qq -y install $PACKAGES > /dev/null;
 }
 
+function get_default_hostname {
+	# Guess the machine's hostname. It should be a fully qualified
+	# domain name suitable for DNS. None of these calls may provide
+	# the right value, but it's the best guess we can make.
+	set -- $(hostname --fqdn      2>/dev/null ||
+                 hostname --all-fqdns 2>/dev/null ||
+                 hostname             2>/dev/null)
+	printf '%s\n' "$1" # return this value
+}
+
+function get_default_publicip {
+	# Get the machine's public IP address. The machine might have
+	# an IP on a private network, but the IP address that we put
+	# into DNS must be one on the public Internet. Try a public
+	# API, but if that fails (maybe we don't have Internet access
+	# right now) then use the IP address that this machine knows
+	# itself as.
+	get_publicip_from_web_service || get_publicip_fallback
+}
+
+function get_publicip_from_web_service {
+	# This seems to be the most reliable way to determine the
+	# machine's public IP address: asking a very nice web API
+	# for how they see us. Thanks go out to icanhazip.com.
+	curl --fail --silent icanhazip.com 2>/dev/null
+}
+
+function get_publicip_fallback {
+	# Return the IP address that this machine knows itself as.
+	# It certainly may not be the IP address that this machine
+	# operates as on the public Internet. The machine might
+	# have multiple addresses if it has multiple network adapters.
+	set -- $(hostname --ip-address       2>/dev/null) \
+	       $(hostname --all-ip-addresses 2>/dev/null)
+	while (( $# )) && is_loopback_ip "$1"; do
+		shift
+	done
+	printf '%s\n' "$1" # return this value
+}
+
+function is_loopback_ip {
+	# helper for get_publicip_fallback
+	[[ "$1" == 127.* ]]
+}
+
 function ufw_allow {
 	if [ -z "$DISABLE_FIREWALL" ]; then
 		# ufw has completely unhelpful output

setup/start.sh

@@ -2,6 +2,8 @@
 # This is the entry point for configuring the system.
 #####################################################
 
+source setup/functions.sh # load our functions
+
 # Check system setup.
 
 if [ "`lsb_release -d | sed 's/.*:\s*//'`" != "Ubuntu 14.04 LTS" ]; then
@@ -31,7 +33,7 @@ if [ -z "$PUBLIC_HOSTNAME" ]; then
 
 	if [ -z "$DEFAULT_PUBLIC_HOSTNAME" ]; then
 		# set a default on first run
-		DEFAULT_PUBLIC_HOSTNAME=`hostname`
+		DEFAULT_PUBLIC_HOSTNAME=`get_default_hostname`
 	fi
 
 	read -e -i "$DEFAULT_PUBLIC_HOSTNAME" -p "Hostname: " PUBLIC_HOSTNAME
@@ -46,7 +48,7 @@ if [ -z "$PUBLIC_IP" ]; then
 
 	if [ -z "$DEFAULT_PUBLIC_IP" ]; then
 		# set a default on first run
-		DEFAULT_PUBLIC_IP=`hostname -i`
+		DEFAULT_PUBLIC_IP=`get_default_publicip`
 	fi
 
 	read -e -i "$DEFAULT_PUBLIC_IP" -p "Public IP: " PUBLIC_IP
@@ -69,18 +71,13 @@ fi
 
 # Automatic configuration, e.g. as used in our Vagrant configuration.
 if [ "$PUBLIC_IP" == "auto" ]; then
-	# Assume `hostname -i` gives the correct public IP address for the machine.
-	PUBLIC_IP=`hostname -i`
-	echo "IP Address: $PUBLIC_IP"
-fi
-if [ "$PUBLIC_IP" == "auto-web" ]; then
 	# Use a public API to get our public IP address.
-	PUBLIC_IP=`curl -s icanhazip.com`
+	PUBLIC_IP=`get_default_publicip`
 	echo "IP Address: $PUBLIC_IP"
 fi
 if [ "$PUBLIC_HOSTNAME" == "auto-easy" ]; then
 	# Generate a probably-unique subdomain under our justtesting.email domain.
-	PUBLIC_HOSTNAME=m`hostname -i | sha1sum | cut -c1-5`.justtesting.email
+	PUBLIC_HOSTNAME=m`get_default_publicip | sha1sum | cut -c1-5`.justtesting.email
 	echo "Public Hostname: $PUBLIC_HOSTNAME"
 fi
 

tools/mail.py

@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 
-import sys, urllib.request, urllib.error
+import sys, getpass, urllib.request, urllib.error
 
 def mgmt(cmd, data=None):
 	req = urllib.request.Request('http://localhost:10222' + cmd, urllib.parse.urlencode(data).encode("utf8") if data else None)
@@ -11,6 +11,15 @@ def mgmt(cmd, data=None):
 		sys.exit(1)
 	return response.read().decode('utf8')
 
+def read_password():
+	first  = getpass.getpass('password: ')
+	second = getpass.getpass(' (again): ')
+	while first != second:
+		print('Passwords not the same. Try again.')
+		first  = getpass.getpass('password: ')
+		second = getpass.getpass(' (again): ')
+	return first
+
 if len(sys.argv) < 2:
 	print("Usage: ")
 	print("  tools/mail.py user  (lists users)")
@@ -33,7 +42,7 @@ elif sys.argv[1] == "user" and sys.argv[2] in ("add", "password"):
 			email = input("email: ")
 		else:
 			email = sys.argv[3]
-		pw = input("password: ")
+		pw = read_password()
 	else:
 		email, pw = sys.argv[3:5]