Add debconf warning when no public ip

debian/lokinet-router.postinst

@@ -1,6 +1,7 @@
 #!/bin/sh -e
 
 set -e
+. /usr/share/debconf/confmodule
 
 if [ "$1" = configure ]; then
     mkdir -p /etc/loki
@@ -35,7 +36,7 @@ if [ "$1" = configure ]; then
         }" $tmpdir/lokinet.ini
     chmod 640 $tmpdir/lokinet.ini
     chgrp _loki $tmpdir/lokinet.ini
-    ucf $tmpdir/lokinet.ini /etc/loki/lokinet-router.ini
+    ucf --debconf-ok $tmpdir/lokinet.ini /etc/loki/lokinet-router.ini
     ucfr lokinet /etc/loki/lokinet-router.ini
 
     tmpdir=$(mktemp --tmpdir -d lokinet.XXXXXXXXXX)
@@ -54,8 +55,24 @@ if [ "$1" = configure ]; then
         }" $tmpdir/lokinet.ini
     chmod 640 $tmpdir/lokinet.ini
     chgrp _loki $tmpdir/lokinet.ini
-    ucf $tmpdir/lokinet.ini /etc/loki/lokinet-testnet-router.ini
+    ucf --debconf-ok $tmpdir/lokinet.ini /etc/loki/lokinet-testnet-router.ini
     ucfr lokinet /etc/loki/lokinet-testnet-router.ini
+
+    # If this system has only private IPs and warn the user that they need to update the config file
+    if ! grep -q '^public-\(ip\|address\)=' /etc/loki/lokinet-router.ini; then
+        if ! ip -4 addr show | perl -le '
+            while (<>) {
+                next if !m{^ +inet +(\d+)\.(\d+)\.(\d+)\.(\d+)/};
+                exit 0 if not ($1 == 0 or $1 == 10 or ($1 == 100 and ($2 >= 64 and $2 <= 127)) or $1 == 127 or
+                    ($1 == 169 and $1 == 254) or ($1 == 172 and $2 >= 16 and $2 <= 31) or ($1 == 192 and $2 == 168) or $1 >= 224);
+            }
+            exit 1'; then
+
+            db_reset lokinet-router/no-public-ip || true
+            db_input critical lokinet-router/no-public-ip || true
+            db_go || true
+        fi
+    fi
 fi
 
 #DEBHELPER#

debian/lokinet-router.templates

@@ -0,0 +1,17 @@
+Template: lokinet-router/no-public-ip
+Type: note
+Description: No public IP detected!
+ This system does not appear to have any public IPv4 address, which Lokinet
+ service nodes require.
+ .
+ This is not necessarily an error: some VPS providers use exotic setups that
+ automatically forward your public IP traffic to your internal IP.
+ .
+ Assuming this machine is publicly reachable, Lokinet needs to be told the
+ public IP and port by updating the configuration file
+ (/etc/loki/lokinet-router.ini) to set the following [router] options:
+ .
+   public-ip=YOURPUBLICIP
+   public-port=1090
+ .
+ Until this change is made, lokinet will not properly start up.