mirror of
https://github.com/pi-hole/pi-hole.git
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228 lines
7.2 KiB
Bash
Executable file
228 lines
7.2 KiB
Bash
Executable file
#!/usr/bin/env sh
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# shellcheck disable=SC3043 #https://github.com/koalaman/shellcheck/wiki/SC3043#exceptions
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# Pi-hole: A black hole for Internet advertisements
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# (c) 2017 Pi-hole, LLC (https://pi-hole.net)
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# Network-wide ad blocking via your own hardware.
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#
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# Script to hold api functions for use in other scripts
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#
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# This file is copyright under the latest version of the EUPL.
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# Please see LICENSE file for your rights under this license.
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# The basic usage steps are
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# 1) Test Availability of the API
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# 2) Try to authenticate (read password if needed)
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# 3) Get the data from the API endpoint
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# 4) Delete the session
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TestAPIAvailability() {
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# as we are running locally, we can get the port value from FTL directly
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local chaos_api_list availabilityResponse
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# Query the API URLs from FTL using CHAOS TXT local.api.ftl
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# The result is a space-separated enumeration of full URLs
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# e.g., "http://localhost:80/api/" "https://localhost:443/api/"
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chaos_api_list="$(dig +short chaos txt local.api.ftl @127.0.0.1)"
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# If the query was not successful, the variable is empty
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if [ -z "${chaos_api_list}" ]; then
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echo "API not available. Please check connectivity"
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exit 1
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fi
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# Iterate over space-separated list of URLs
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while [ -n "${chaos_api_list}" ]; do
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# Get the first URL
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API_URL="${chaos_api_list%% *}"
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# Strip leading and trailing quotes
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API_URL="${API_URL%\"}"
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API_URL="${API_URL#\"}"
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# Test if the API is available at this URL
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availabilityResponse=$(curl -skS -o /dev/null -w "%{http_code}" "${API_URL}auth")
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# Test if http status code was 200 (OK) or 401 (authentication required)
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if [ ! "${availabilityResponse}" = 200 ] && [ ! "${availabilityResponse}" = 401 ]; then
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# API is not available at this port/protocol combination
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API_PORT=""
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else
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# API is available at this URL combination
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if [ "${availabilityResponse}" = 200 ]; then
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# API is available without authentication
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needAuth=false
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fi
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break
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fi
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# Remove the first URL from the list
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local last_api_list
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last_api_list="${chaos_api_list}"
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chaos_api_list="${chaos_api_list#* }"
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# If the list did not change, we are at the last element
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if [ "${last_api_list}" = "${chaos_api_list}" ]; then
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# Remove the last element
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chaos_api_list=""
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fi
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done
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# if API_PORT is empty, no working API port was found
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if [ -n "${API_PORT}" ]; then
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echo "API not available at: ${API_URL}"
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echo "Exiting."
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exit 1
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fi
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}
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LoginAPI() {
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# If the API URL is not set, test the availability
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if [ -z "${API_URL}" ]; then
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TestAPIAvailability
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fi
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# Exit early if authentication is not needed
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if [ "${needAuth}" = false ]; then
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return
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fi
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# Try to read the CLI password (if enabled and readable by the current user)
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if [ -r /etc/pihole/cli_pw ]; then
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password=$(cat /etc/pihole/cli_pw)
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# Try to authenticate using the CLI password
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Authentication
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fi
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# If this did not work, ask the user for the password
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while [ "${validSession}" = false ] || [ -z "${validSession}" ] ; do
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echo "Authentication failed. Please enter your Pi-hole password"
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# secretly read the password
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secretRead; printf '\n'
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# Try to authenticate again
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Authentication
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done
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}
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Authentication() {
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sessionResponse="$(curl -skS -X POST "${API_URL}auth" --user-agent "Pi-hole cli " --data "{\"password\":\"${password}\"}" )"
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if [ -z "${sessionResponse}" ]; then
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echo "No response from FTL server. Please check connectivity"
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exit 1
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fi
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# obtain validity and session ID from session response
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validSession=$(echo "${sessionResponse}"| jq .session.valid 2>/dev/null)
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SID=$(echo "${sessionResponse}"| jq --raw-output .session.sid 2>/dev/null)
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}
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LogoutAPI() {
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# if a valid Session exists (no password required or successful Authentication) and
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# SID is not null (successful Authentication only), delete the session
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if [ "${validSession}" = true ] && [ ! "${SID}" = null ]; then
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# Try to delete the session. Omit the output, but get the http status code
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deleteResponse=$(curl -skS -o /dev/null -w "%{http_code}" -X DELETE "${API_URL}auth" -H "Accept: application/json" -H "sid: ${SID}")
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case "${deleteResponse}" in
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"401") printf "%b" "Logout attempt without a valid session. Unauthorized!\n";;
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esac;
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fi
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}
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GetFTLData() {
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local data response status
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# get the data from querying the API as well as the http status code
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response=$(curl -skS -w "%{http_code}" -X GET "${API_URL}$1" -H "Accept: application/json" -H "sid: ${SID}" )
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# status are the last 3 characters
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status=$(printf %s "${response#"${response%???}"}")
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# data is everything from response without the last 3 characters
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data=$(printf %s "${response%???}")
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if [ "${status}" = 200 ]; then
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# response OK
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printf %s "${data}"
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elif [ "${status}" = 000 ]; then
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# connection lost
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echo "000"
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elif [ "${status}" = 401 ]; then
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# unauthorized
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echo "401"
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fi
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}
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PostFTLData() {
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local data response status
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# send the data to the API
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response=$(curl -skS -w "%{http_code}" -X POST "${API_URL}$1" --data-raw "$2" -H "Accept: application/json" -H "sid: ${SID}" )
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# data is everything from response without the last 3 characters
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if [ "${3}" = "status" ]; then
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# Keep the status code appended if requested
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printf %s "${response}"
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else
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# Strip the status code
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printf %s "${response%???}"
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fi
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}
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secretRead() {
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# POSIX compliant function to read user-input and
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# mask every character entered by (*)
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#
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# This is challenging, because in POSIX, `read` does not support
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# `-s` option (suppressing the input) or
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# `-n` option (reading n chars)
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# This workaround changes the terminal characteristics to not echo input and later resets this option
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# credits https://stackoverflow.com/a/4316765
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# showing asterisk instead of password
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# https://stackoverflow.com/a/24600839
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# https://unix.stackexchange.com/a/464963
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# Save current terminal settings (needed for later restore after password prompt)
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stty_orig=$(stty -g)
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stty -echo # do not echo user input
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stty -icanon min 1 time 0 # disable canonical mode https://man7.org/linux/man-pages/man3/termios.3.html
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unset password
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unset key
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unset charcount
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charcount=0
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while key=$(dd ibs=1 count=1 2>/dev/null); do #read one byte of input
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if [ "${key}" = "$(printf '\0' | tr -d '\0')" ] ; then
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# Enter - accept password
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break
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fi
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if [ "${key}" = "$(printf '\177')" ] ; then
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# Backspace
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if [ $charcount -gt 0 ] ; then
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charcount=$((charcount-1))
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printf '\b \b'
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password="${password%?}"
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fi
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else
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# any other character
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charcount=$((charcount+1))
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printf '*'
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password="$password$key"
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fi
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done
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# restore original terminal settings
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stty "${stty_orig}"
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}
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