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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

92
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
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
if [ -z "$PUBLIC_IP" ]; then
echo
echo "Enter the public IP address of this machine, as given to you by your ISP."
echo
read -e -i "$DEFAULT_PUBLIC_IP" -p "Public IP: " PUBLIC_IP
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
echo
echo "(Optional) Enter the IPv6 address of this machine. Leave blank"
echo " if the machine does not have an IPv6 address."
if [[ -z "$PUBLIC_IPV6" && $MATCHED == 0 ]]; then
echo
echo "Optional:"
echo "Enter the public IPv6 address of this machine, as given to you by your ISP."
echo "Leave blank if the machine does not have an IPv6 address."
echo
read -e -i "$DEFAULT_PUBLIC_IPV6" -p "Public IPv6: " PUBLIC_IPV6
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