notes about ipv6

[distro-setup] / switch-mail-host

diff --git a/switch-mail-host b/switch-mail-host
index a06e1baec6c5abd9bd7ab3bf201fbe1e1524d9f1..0cc8c0b76a20bc6b4c5538865358bae285587b43 100755 (executable)
--- a/switch-mail-host
+++ b/switch-mail-host
@@ -66,7 +66,7 @@ if [[ ! $new_host || ! $old_host ]]; then
 fi
 
 at_home=false
-if [[ $HOSTNAME == tp ]] || [[ $HOSTNAME == frodo ]] || timeout -s 9 5 ssh wrt.b8.nz :; then
+if timeout -s 9 5 ssh-keyscan -p 2220 -t rsa 10.0.0.1 2>/dev/null | grep -qFx '[10.0.0.1]:2220 ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCH+/h1dGEfKEusBblndU2e6QT4wLCm5+yqr/sqh/0X9YfjR7BfWWm8nNmuP55cYc+Wuf5ljB1H1acXEcsl1y8e0j3agHfF0V74FE1N1zz5nn2Ep8NHnmqgEhza38ZxMPh+4p3X7zklEKU7+3SzybKBi8sg0wLzlS2LM0JaUN80zR2sK11Kye3dURUXPk78u5wodOkgcEYRwSYaDMJlUzWP+poRXIDJwFaMQnwmxbl/c84yOyaU0x/d6hFwoRscWecihX+vvBNeSyxR4xr2HDOyUWwJkctyAgt2p7w3tfkXOKcCRzTAjGVIMQLTvo0sG/yJbcyHoEFdFybCsgDvfyYn'; then
   at_home=true
 fi
 echo "$0: at_home = $at_home"
@@ -89,14 +89,8 @@ source /a/bin/bash_unpublished/source-semi-priv
 # todo: setup vpn so this is all taken care of.
 if ! $update_wrt; then
   wrt_shell=:
-elif $at_home; then
-  wrt_shell="ssh wrt.b8.nz"
 else
-  if [[ $old_host == iank.vpn.office.fsf.org || $new_host == iank.vpn.office.fsf.org ]]; then
-    wrt_shell="ssh iank.vpn.office.fsf.org ssh wrt.b8.nz"
-  else
-    wrt_shell="ssh $HOME_DOMAIN ssh wrt.b8.nz"
-  fi
+  wrt_shell="ssh wrt.b8.nz"
 fi
 
 btrbk_test="systemctl is-active btrbk.service"
@@ -129,18 +123,19 @@ if mountpoint -q /m; then sudo umount /m; fi
 if mountpoint -q /o; then sudo umount /o; fi
 EOF
 
-# if new_host is not on home network, make mail.iankelling.org not resolve
-# on the home network.
-if [[ $new_host == $HOSTNAME ]] && ! $at_home; then
-  echo | $wrt_shell cedit mail_host /etc/hosts || [[ $? == 1 ]] # 1 means file changed.
-else
-  $wrt_shell bash -xs $new_host <<'EOFOUTER'
-new_host=$1
-cedit mail_host /etc/hosts <<EOF || /etc/init.d/dnsmasq restart
-$(grep "\b$new_hostname\b" /etc/hosts | awk '{print $1}') mail.iankelling.org
-EOF
-EOFOUTER
-fi
+# previously, I was checking to see if the new mail host
+# is on my home network, then changing my home dns
+# to resolve on the local network, so that I didnt
+# have to send traffic out to the internet or rely
+# on that. However, that breaks for a laptop that roams.
+# So, we could have a cronjob that updates that dns,
+# however, another solution is to just use ipv6,
+# and I prefer that.
+#
+# TODO: enable ipv6 for email. exim config setting disables it.
+# need to add vpn support. need to add firewall / routing.
+# I think exim will try ipv6 first, so no need to disable
+# ipv6 i think.
 
 $old_shell primary-setup $new_hostname