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dont ask the user for the machine's IP address if we can be sure our guess is right (trust icanhazip to give us the right answer)

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This commit is contained in:
Joshua Tauberer 2014-07-29 20:04:50 -04:00
parent 0be92d776e
commit cd59025979
2 changed files with 66 additions and 40 deletions
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14
setup/functions.sh
View file

@ -70,20 +70,6 @@ function get_default_hostname {
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 4 || get_default_privateip 4
}
function get_default_publicipv6 {
get_publicip_from_web_service 6 || get_default_privateip 6
}
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

82
setup/start.sh
View file

@ -106,34 +106,62 @@ if [ -z "$PRIMARY_HOSTNAME" ]; then
fi
# If the machine is behind a NAT, inside a VM, etc., it may not know
# its IP address on the public network / the Internet. We need to
# confirm our best guess with the user.
# its IP address on the public network / the Internet. Ask the Internet
# and possibly confirm with user.
if [ -z "$PUBLIC_IP" ]; then
if [ -z "$DEFAULT_PUBLIC_IP" ]; then
# set a default on first run
DEFAULT_PUBLIC_IP=`get_default_publicip`
# Ask the Internet.
GUESSED_IP=$(get_publicip_from_web_service 4)
# On the first run, if we got an answer from the Internet then don't
# ask the user.
if [[ -z "$DEFAULT_PUBLIC_IP" && ! -z "$GUESSED_IP" ]]; then
PUBLIC_IP=$GUESSED_IP
# Otherwise on the first run at least provide a default.
elif [[ -z "$DEFAULT_PUBLIC_IP" ]]; then
DEFAULT_PUBLIC_IP=$(get_default_privateip 4)
# On later runs, if the previous value matches the guessed value then
# don't ask the user either.
elif [ "$DEFAULT_PUBLIC_IP" == "$GUESSED_IP" ]; then
PUBLIC_IP=$GUESSED_IP
fi
if [ -z "$PUBLIC_IP" ]; then
echo
echo "Enter the public IP address of this machine, as given to you by your"
echo "ISP. We've guessed a value, but just backspace it if it's wrong."
echo "Enter the public IP address of this machine, as given to you by your ISP."
echo
read -e -i "$DEFAULT_PUBLIC_IP" -p "Public IP: " PUBLIC_IP
fi
fi
# Same for IPv6.
# Same for IPv6. But it's optional. Also, if it looks like the system
# doesn't have an IPv6, don't ask for one.
if [ -z "$PUBLIC_IPV6" ]; then
if [ -z "$DEFAULT_PUBLIC_IPV6" ]; then
# set a default on first run
DEFAULT_PUBLIC_IPV6=`get_default_publicipv6`
# Ask the Internet.
GUESSED_IP=$(get_publicip_from_web_service 6)
MATCHED=0
if [[ -z "$DEFAULT_PUBLIC_IPV6" && ! -z "$GUESSED_IP" ]]; then
PUBLIC_IPV6=$GUESSED_IP
elif [[ "$DEFAULT_PUBLIC_IPV6" == "$GUESSED_IP" ]]; then
# No IPv6 entered and machine seems to have none, or what
# the user entered matches what the Internet tells us.
PUBLIC_IPV6=$GUESSED_IP
MATCHED=1
elif [[ -z "$DEFAULT_PUBLIC_IPV6" ]]; then
DEFAULT_PUBLIC_IP=$(get_default_privateip 6)
fi
if [[ -z "$PUBLIC_IPV6" && $MATCHED == 0 ]]; then
echo
echo "Optional:"
echo "Enter the public IPv6 address of this machine, as given to you by your ISP."
echo "Leave blank if the machine does not have an IPv6 address."
echo
echo "(Optional) Enter the IPv6 address of this machine. Leave blank"
echo " if the machine does not have an IPv6 address."
read -e -i "$DEFAULT_PUBLIC_IPV6" -p "Public IPv6: " PUBLIC_IPV6
fi
fi
# Get the IP addresses of the local network interface(s) that are connected
@ -182,21 +210,33 @@ fi
# Automatic configuration, e.g. as used in our Vagrant configuration.
if [ "$PUBLIC_IP" = "auto" ]; then
# Use a public API to get our public IP address.
PUBLIC_IP=`get_default_publicip`
echo "IP Address: $PUBLIC_IP"
# Use a public API to get our public IP address, or fall back to local network configuration.
PUBLIC_IP=$(get_publicip_from_web_service 4 || get_default_privateip 4)
fi
if [ "$PUBLIC_IPV6" = "auto" ]; then
# Use a public API to get our public IP address.
PUBLIC_IPV6=`get_default_publicipv6`
echo "IPv6 Address: $PUBLIC_IPV6"
# Use a public API to get our public IPv6 address, or fall back to local network configuration.
PUBLIC_IPV6=$(get_publicip_from_web_service 6 || get_default_privateip 6)
fi
if [ "$PRIMARY_HOSTNAME" = "auto-easy" ]; then
# Generate a probably-unique subdomain under our justtesting.email domain.
PRIMARY_HOSTNAME=m`get_default_publicip | sha1sum | cut -c1-5`.justtesting.email
echo "Primary Hostname: $PRIMARY_HOSTNAME"
PRIMARY_HOSTNAME=`echo $PUBLIC_IP | sha1sum | cut -c1-5`.justtesting.email
fi
# Show the configuration, since the user may have not entered it manually.
echo
echo "Primary Hostname: $PRIMARY_HOSTNAME"
echo "Public IP Address: $PUBLIC_IP"
if [ ! -z "$PUBLIC_IPV6" ]; then
echo "Public IPv6 Address: $PUBLIC_IPV6"
fi
if [ "$PRIVATE_IP" != "$PUBLIC_IP" ]; then
echo "Private IP Address: $PRIVATE_IP"
fi
if [ "$PRIVATE_IPV6" != "$PUBLIC_IPV6" ]; then
echo "Private IPv6 Address: $PRIVATE_IPV6"
fi
echo
# Run some network checks to make sure setup on this machine makes sense.
if [ -z "$SKIP_NETWORK_CHECKS" ]; then
. setup/network-checks.sh