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Add fallback option for OS check without hard-coded nameserver (#5751)

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yubiuser 2024-09-23 22:59:56 +02:00 committed by GitHub
commit 8dbdae40e8
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1 changed files with 73 additions and 28 deletions
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95
automated install/basic-install.sh
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@ -167,63 +167,108 @@ is_command() {
command -v "${check_command}" >/dev/null 2>&1
}
os_check_dig(){
local protocol="$1"
local domain="$2"
local nameserver="$3"
local response
response="$(dig -"${protocol}" +short -t txt "${domain}" "${nameserver}" 2>&1
echo $?
)"
echo "${response}"
}
os_check_dig_response(){
# Checks the reply from the dig command to determine if it's a valid response
local digReply="$1"
local response
# Dig returned 0 (success), so get the actual response, and loop through it to determine if the detected variables above are valid
response="${digReply%%$'\n'*}"
# If the value of ${response} is a single 0, then this is the return code, not an actual response.
if [ "${response}" == 0 ]; then
echo false
else
echo true
fi
}
os_check() {
if [ "$PIHOLE_SKIP_OS_CHECK" != true ]; then
# This function gets a list of supported OS versions from a TXT record at versions.pi-hole.net
# and determines whether or not the script is running on one of those systems
local remote_os_domain valid_os valid_version valid_response detected_os detected_version display_warning cmdResult digReturnCode response
local piholeNameserver="@ns1.pi-hole.net"
remote_os_domain=${OS_CHECK_DOMAIN_NAME:-"versions.pi-hole.net"}
detected_os=$(grep '^ID=' /etc/os-release | cut -d '=' -f2 | tr -d '"')
detected_version=$(grep VERSION_ID /etc/os-release | cut -d '=' -f2 | tr -d '"')
# Test via IPv4
cmdResult="$(
dig -4 +short -t txt "${remote_os_domain}" @ns1.pi-hole.net 2>&1
echo $?
)"
# Test via IPv4 and hardcoded nameserver ns1.pi-hole.net
cmdResult=$(os_check_dig 4 "${remote_os_domain}" "${piholeNameserver}")
# Gets the return code of the previous command (last line)
digReturnCode="${cmdResult##*$'\n'}"
if [ ! "${digReturnCode}" == "0" ]; then
valid_response=false
else
# Dig returned 0 (success), so get the actual response, and loop through it to determine if the detected variables above are valid
response="${cmdResult%%$'\n'*}"
# If the value of ${response} is a single 0, then this is the return code, not an actual response.
if [ "${response}" == 0 ]; then
valid_response=false
else
valid_response=true
fi
valid_response=$(os_check_dig_response cmdResult)
fi
# Try again via IPv6
# Try again via IPv6 and hardcoded nameserver ns1.pi-hole.net
if [ "$valid_response" = false ]; then
unset valid_response
unset cmdResult
unset digReturnCode
cmdResult="$(
dig -6 +short -t txt "${remote_os_domain}" @ns1.pi-hole.net 2>&1
echo $?
)"
cmdResult=$(os_check_dig 6 "${remote_os_domain}" "${piholeNameserver}")
# Gets the return code of the previous command (last line)
digReturnCode="${cmdResult##*$'\n'}"
if [ ! "${digReturnCode}" == "0" ]; then
valid_response=false
else
# Dig returned 0 (success), so get the actual response, and loop through it to determine if the detected variables above are valid
response="${cmdResult%%$'\n'*}"
# If the value of ${response} is a single 0, then this is the return code, not an actual response.
if [ "${response}" == 0 ]; then
valid_response=$(os_check_dig_response cmdResult)
fi
fi
# Try again without hardcoded nameserver
if [ "$valid_response" = false ]; then
unset valid_response
unset cmdResult
unset digReturnCode
cmdResult=$(os_check_dig 4 "${remote_os_domain}")
# Gets the return code of the previous command (last line)
digReturnCode="${cmdResult##*$'\n'}"
if [ ! "${digReturnCode}" == "0" ]; then
valid_response=false
else
valid_response=true
valid_response=$(os_check_dig_response cmdResult)
fi
fi
if [ "$valid_response" = false ]; then
unset valid_response
unset cmdResult
unset digReturnCode
cmdResult=$(os_check_dig 6 "${remote_os_domain}")
# Gets the return code of the previous command (last line)
digReturnCode="${cmdResult##*$'\n'}"
if [ ! "${digReturnCode}" == "0" ]; then
valid_response=false
else
valid_response=$(os_check_dig_response cmdResult)
fi
fi
if [ "$valid_response" = true ]; then
response="${cmdResult%%$'\n'*}"
IFS=" " read -r -a supportedOS < <(echo "${response}" | tr -d '"')
for distro_and_versions in "${supportedOS[@]}"; do
distro_part="${distro_and_versions%%=*}"
@ -259,8 +304,8 @@ os_check() {
printf " %b %bRetrieval of supported OS list failed. %s. %b\\n" "${CROSS}" "${COL_LIGHT_RED}" "${errStr}" "${COL_NC}"
printf " %bUnable to determine if the detected OS (%s %s) is supported%b\\n" "${COL_LIGHT_RED}" "${detected_os^}" "${detected_version}" "${COL_NC}"
printf " Possible causes for this include:\\n"
printf " - Firewall blocking certain DNS lookups from Pi-hole device\\n"
printf " - ns1.pi-hole.net being blocked (required to obtain TXT record from versions.pi-hole.net containing supported operating systems)\\n"
printf " - Firewall blocking DNS lookups from Pi-hole device to ns1.pi-hole.net\\n"
printf " - DNS resolution issues of the host system\\n"
printf " - Other internet connectivity issues\\n"
else
printf " %b %bUnsupported OS detected: %s %s%b\\n" "${CROSS}" "${COL_LIGHT_RED}" "${detected_os^}" "${detected_version}" "${COL_NC}"