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link-local IPv6 addresses need a '%interface' specification to be useful
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@ -85,6 +85,9 @@ function get_default_privateip {
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# Return the IP address of the network interface connected
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# to the Internet.
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#
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# Pass '4' or '6' as an argument to this function to specify
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# what type of address to get (IPv4, IPv6).
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#
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# We used to use `hostname -I` and then filter for either
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# IPv4 or IPv6 addresses. However if there are multiple
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# network interfaces on the machine, not all may be for
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@ -99,11 +102,16 @@ function get_default_privateip {
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# assigned to an interface. `ip route get` reports the
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# preferred. That's good enough for us. See issue #121.
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#
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# With IPv6, the best route may be via an interface that
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# only has a link-local address (fe80::*). These addresses
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# are only unique to an interface and so need an explicit
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# interface specification in order to use them with bind().
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# In these cases, we append "%interface" to the address.
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# See the Notes section in the man page for getaddrinfo and
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# https://discourse.mailinabox.email/t/update-broke-mailinabox/34/9.
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#
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# Also see ae67409603c49b7fa73c227449264ddd10aae6a9 and
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# issue #3 for why/how we originally added IPv6.
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#
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# Pass '4' or '6' as an argument to this function to specify
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# what type of address to get (IPv4, IPv6).
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target=8.8.8.8
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@ -112,9 +120,21 @@ function get_default_privateip {
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# as it's an address on the public Internet.
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if [ "$1" == "6" ]; then target=2001:4860:4860::8888; fi
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ip -$1 -o route get $target \
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| grep -v unreachable \
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| sed "s/.* src \([^ ]*\).*/\1/"
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# Get the route information.
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route=$(ip -$1 -o route get $target | grep -v unreachable)
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# Parse the address out of the route information.
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address=$(echo $route | sed "s/.* src \([^ ]*\).*/\1/")
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if [[ "$1" == "6" && $address == fe80:* ]]; then
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# For IPv6 link-local addresses, parse the interface out
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# of the route information and append it with a '%'.
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interface=$(echo $route | sed "s/.* dev \([^ ]*\).*/\1/")
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address=$address%$interface
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fi
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echo $address
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}
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function ufw_allow {
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