├── screenshots ├── fail.png ├── many.png ├── okay.png └── firstVersion.png ├── .github └── FUNDING.yml ├── README.md ├── srvmon └── LICENSE /screenshots/fail.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/RaymiiOrg/bash-http-monitoring/master/screenshots/fail.png -------------------------------------------------------------------------------- /screenshots/many.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/RaymiiOrg/bash-http-monitoring/master/screenshots/many.png -------------------------------------------------------------------------------- /screenshots/okay.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/RaymiiOrg/bash-http-monitoring/master/screenshots/okay.png -------------------------------------------------------------------------------- /screenshots/firstVersion.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/RaymiiOrg/bash-http-monitoring/master/screenshots/firstVersion.png -------------------------------------------------------------------------------- /.github/FUNDING.yml: -------------------------------------------------------------------------------- 1 | # These are supported funding model platforms 2 | 3 | github: [raymiiorg] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2] 4 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # bash-http-monitoring 2 | 3 | ![all is well image][1] 4 | 5 | HTTP(s) status dashboard webpage via shell script. Parallel checking, thus very fast, only dependencies are 6 | curl, coreutils and bash (version 4 or above). For all of you who want a simple script with a nice webpage to check 7 | a few websites. Perfect for a wall mounted monitoring display and a Raspberry Pi. 8 | 9 | Installation and configuration is easy to do inside the script. It scales well, both on the checking side 10 | as the information display page (dense on purpose). Failed checks appear right on top for you to act on. 11 | 12 | You can set an expected status code and a max timeout per check, so if you consider your site up when 13 | it returns a 302 (redirect) or 401 (unauthorized) the script consider that okay. If the status code 14 | is not what is configured or there is a timeout or another error, the script considers the check failed. 15 | 16 | If a check fails, the script will check that specific one again after 5 seconds to prevent flapping. 17 | 18 | Author: [Remy van Elst][6] 19 | 20 | [Website with more information][8] 21 | 22 | What this does not have: 23 | 24 | - Notifications 25 | - History 26 | 27 | There however is the option to set a `callback_url`, whenever a check fails the script will send 28 | the status to that URL, allowing you to set up your own history logging or alerting. 29 | 30 | ## Changelog 31 | 32 | * 27-12-2020: Initial release 33 | * 30-12-2020: Added `cgi-bin`/`docker` support 34 | * 11-01-2021: Added callback URL for failed checks 35 | 36 | ## Installation & Configuration 37 | 38 | Make sure you have curl installed (`apt install curl`). If you need a very simple webserver, try [micro-httpd, by ACME][5]. (`apt install micro-httpd`). 39 | 40 | Clone the git repository: 41 | 42 | git clone https://github.com/RaymiiOrg/bash-http-monitoring.git 43 | cd bash-http-monitoring 44 | 45 | Edit the `srvmon` script and add your sites. A few examples are provided. This is the syntax: 46 | 47 | urls[gists]="https://gist.github.com" 48 | urls[lobsters]="https://lobste.rs" 49 | urls[raymii.org]="https://raymii.org" 50 | urls[example]="http://example.org:3000/this/is/a/test" 51 | 52 | The first part between the square brackets is the name, the second part between the quotes is the URL you want 53 | to monitor. It can be just a domain, an IP or an actual URL, including port and such. 54 | 55 | If you want to override the default status code for a check, this is the syntax: 56 | 57 | statuscode[gists]=302 58 | 59 | The first part between the square brackets must match the `urls[]` part. 60 | 61 | Further global configuration options include: 62 | 63 | maxConcurrentCurls=12 # How many curl checks to run at the same time 64 | defaultTimeOut=10 # Max timeout of a check in seconds 65 | flapRetry=5 # After how many seconds should we re-check any failed checks? (To prevent flapping) 66 | title="Status Dashboard" # Title of the webpage 67 | cgi=false # Enable or disable CGI header 68 | callbackURL="" # leave empty to disable, otherwise see readme 69 | 70 | Execute the script and send the output to a file in your webservers documentroot: 71 | 72 | bash srvmon > /var/www/index.html 73 | 74 | View that file in a web browser. 75 | 76 | #### OS X specifics 77 | 78 | On Mac OS X the builtin bash version is too old and the bsd date utility does 79 | not support the time in milliseconds option, so you have 80 | to use [homebrew](https://brew.sh) to install coreutils and bash: 81 | 82 | brew install bash coreutils curl 83 | 84 | 85 | Then you have to run the script with that bash version: 86 | 87 | /usr/local/Cellar/bash/#VERSION#/bin/bash 88 | 89 | Also in the cronjob if you choose to set that up. 90 | 91 | 92 | ### Cronjob setup 93 | 94 | If you want to set up a cronjob, send the output to a temp file and when finished, move that temp 95 | file over the "actual" file. Otherwise you might end up with an incomplete page when the checks are 96 | running. Like so: 97 | 98 | * * * * * /bin/bash /opt/srvmon/srvmon > /var/www/index.html.tmp && /bin/mv /var/www/index.html.tmp /var/www/index.html 99 | 100 | If the check fails for whatever reason, the "old" page will not be overridden. 101 | 102 | ### CGI header 103 | 104 | Some HTTP servers, like Apache, support CGI scripts. To make it brief, these are scripts which 105 | are handed a HTTP request to reply to. 106 | 107 | The main advantage of using the script as a CGI script, is that the page is generated on demand 108 | and as such, provides a live-view on each page load. 109 | If the page is public, this method should be avoided, as it can be easily abused. 110 | 111 | If you want to set up CGI mode, you need to copy the script to your server CGI directory. 112 | You can use `docker` to try this out. Like so: 113 | 114 | docker run -d -p 9090:80 -v $PWD/srvmon:/usr/local/apache2/cgi-bin/srvmon hypoport/httpd-cgi 115 | 116 | ### Callback URL 117 | 118 | This script does not provide other means of alerting or history. If you do want that, you must do 119 | a bit of work yourself. The script supports a `callback url`, whenever a check failed, it will 120 | do a POST request to a configurable URL with the status and error. This allows you to setup 121 | logging, history, graphs or otherwise alerting yourself. No examples are provided as of yet but 122 | feel free to open a merge request. 123 | 124 | The JSON sent is in the following format: 125 | 126 | { 127 | "url": "The configured URL, URL encoded", 128 | "name": "The configured name" 129 | "expected_status": "The configured expected status code", // as a string 130 | "actual_status": "The actual status code", // as a string 131 | "error": "descriptive error text (from curl mostly)" 132 | } 133 | 134 | It also supports slack webhooks. See [here on the Slack site](https://api.slack.com/messaging/webhooks) how to set up a webhook. The callback URL looks like this: 135 | 136 | https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX 137 | 138 | When the callback URL contains `hooks.slack.com`, the JSON sent is formatted to match slack's webhook specification. 139 | 140 | Each failed check results in its own request. No bundling is done. 141 | 142 | You can use HTTPbin to test locally. HTTPbin is a so called `echo` server, anything 143 | that is sent to it is returned for debugging purposes. Set this in the config: 144 | 145 | callbackURL="http://127.0.0.1:8888/post/" 146 | 147 | Run httpbin in a local docker: 148 | 149 | docker run -p 8888:80 kennethreitz/httpbin 150 | 151 | Configure some failed checks, either a non matching status code or a non-existing domain: 152 | 153 | Example json data: 154 | 155 | { 156 | "url": "https%3A%2F%2Fgist.github.com", 157 | "name": "gist.github.com", 158 | "expected_status": "309", 159 | "actual_status": "302", 160 | "error": "Status code does not match expected code" 161 | } 162 | 163 | Another example: 164 | 165 | { 166 | "url": "https%3A%2F%2Fwww.buiekjhkjhkhkhkjhnradar.nl", 167 | "name": "www.buienradar.nl", 168 | "expected_status": "200", 169 | "actual_status": "000", 170 | "error": "curl: (6) Could not resolve host: www.buiekjhkjhkhkhkjhnradar.nl" 171 | } 172 | 173 | ## Screenshots 174 | 175 | All checks are okay: 176 | 177 | ![all is well image][1] 178 | 179 | A check has failed: 180 | 181 | ![failed checks][2] 182 | 183 | Here is how it looks with many hosts (also note how fast it executes, 6 seconds): 184 | 185 | ![many hosts][4] 186 | 187 | This is what the early version looked like: 188 | 189 | ![beta][3] 190 | 191 | I had this script running at home for at least a year in that form, when I showed it to a friend he liked it, 192 | asked me to make it public, but before I did that I polished it up a bit. 193 | 194 | 195 | [1]: screenshots/okay.png 196 | [2]: screenshots/fail.png 197 | [3]: screenshots/firstVersion.png 198 | [4]: screenshots/many.png 199 | [5]: https://acme.com/software/micro_httpd/ 200 | [6]: https://raymii.org 201 | [8]: https://raymii.org/s/software/Bash_HTTP_Monitoring_Dashboard.html 202 | -------------------------------------------------------------------------------- /srvmon: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | # Copyright 2020 - Remy van Elst - https://raymii.org/s/software/Bash_HTTP_Monitoring_Dashboard.html 3 | # This program is free software: you can redistribute it and/or modify 4 | # it under the terms of the GNU Afferro General Public License as published by 5 | # the Free Software Foundation, either version 3 of the License, or 6 | # (at your option) any later version. 7 | # This program is distributed in the hope that it will be useful, 8 | # but WITHOUT ANY WARRANTY; without even the implied warranty of 9 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 | # GNU General Public License for more details. 11 | # You should have received a copy of the GNU General Public License 12 | # along with this program. If not, see . 13 | 14 | # Start of configuration. 15 | 16 | #array names must not contain spaces, only a-ZA-Z. 17 | declare -A urls # do not remove this line 18 | urls[dilbert.com]="https://dilbert.com" 19 | urls[gist.github.com]="https://gist.github.com" 20 | urls[github.com]="https://github.com" 21 | urls[lobste.rs]="https://lobste.rs" 22 | urls[raymii.org]="https://raymii.org" 23 | urls[treesforlife.org.uk]="https://treesforlife.org.uk" 24 | urls[tweakers.net]="https://tweakers.net" 25 | urls[www.buienradar.nl]="https://www.buienradar.nl" 26 | urls[www.google.com]="https://www.google.com" 27 | urls[www.smbc-comics.com]="https://www.smbc-comics.com" 28 | urls[xkcd.com]="https://xkcd.com" 29 | 30 | # The default status code. Can be overridden per URL lower in the script. 31 | defaultExpectedStatusCode=200 32 | 33 | # Expected code for url, key must match urls[]. Only for URL's you consider UP, but for example require authentication 34 | declare -A statuscode # do not remove this line 35 | statuscode[gist.github.com]=302 36 | 37 | # How many curl checks to run at the same time 38 | maxConcurrentCurls=12 39 | 40 | # Max timeout of a check in seconds 41 | defaultTimeOut=10 42 | 43 | # After how many seconds should we re-check any failed checks? (To prevent flapping) 44 | flapRetry=5 45 | 46 | # Title of the webpage 47 | title="Status Dashboard" 48 | 49 | # Use CGI mode 50 | cgi=false 51 | 52 | # Callback URL for failed checks. Script will do a POST request with 53 | # the following parameters: urlencode(url), name, expected_status, actual_status, error. 54 | callbackURL="" 55 | 56 | # Start of script. Do not edit below 57 | # Exit immediately if a command exits with a non-zero status. 58 | set -e 59 | # patterns which match no files expand to a null string, otherwise later on we'd have *.status as a file... 60 | shopt -s nullglob 61 | 62 | # helper functions 63 | command_exists() { 64 | # check if command exists and fail otherwise 65 | command -v "$1" >/dev/null 2>&1 66 | if [[ $? -ne 0 ]]; then 67 | echo "I require '$1' but it's not installed. Please install it. Aborting." 68 | exit 1 69 | fi 70 | } 71 | 72 | # environment checks 73 | [ "${BASH_VERSINFO:-0}" -lt 4 ] && { echo "I require at least Bash version 4. Aborting." >&2 ; exit 2; } 74 | command_exists curl 75 | 76 | case "$(uname -s)" in 77 | Darwin*) 78 | datecmd="gdate" 79 | command_exists "${datecmd}" 80 | ;; 81 | *) 82 | datecmd="date" 83 | esac 84 | 85 | # start of the function definitions 86 | 87 | # This function allows the script to execute all the curl calls in parallel. 88 | # Otherwise, if one would timeout or take long, the rest after that would be 89 | # slower. We're writing the status code to a file, reading that later on. Why? 90 | # Because an array cannot be filled via a subprocess (curl ... &) 91 | doRequest() { 92 | name="${1}" 93 | url="${2}" 94 | checkStartTimeMs="$(${datecmd} +%s%3N)" # epoch in microseconds, but last chars stripped so it's milliseconds 95 | set +e # curl errors don't count for early exit, turn off e 96 | checkStatusCode="$(curl --max-time "${defaultTimeOut}" --silent --show-error --insecure --output /dev/null --write-out "%{http_code}" "$url" --stderr "${tempfolder}/FAIL/${name}.error")" 97 | set -e # turn e back on 98 | checkEndTimeMs="$(${datecmd} +%s%3N)" 99 | timeCheckTook="$((checkEndTimeMs-checkStartTimeMs))" 100 | 101 | expectedStatusCode=${defaultExpectedStatusCode} 102 | # check if there is a specific status code for this domain 103 | if [[ -n "${statuscode[${name}]}" ]]; then 104 | expectedStatusCode="${statuscode[${name}]}" 105 | fi 106 | 107 | if [[ ${expectedStatusCode} -eq ${checkStatusCode} ]]; then 108 | echo "${timeCheckTook}" > "${tempfolder}/OK/${name}.duration" 109 | # remove any previous failed check attempt 110 | if [[ -r "${tempfolder}/FAIL/${name}.status" ]]; then 111 | rm "${tempfolder}/FAIL/${name}.status" 112 | fi 113 | else 114 | echo "${checkStatusCode}" > "${tempfolder}/FAIL/${name}.status" 115 | # remove any previous okay check 116 | if [[ -r "${tempfolder}/OK/${name}.duration" ]]; then 117 | rm "${tempfolder}/OK/${name}.duration"; 118 | fi 119 | fi 120 | 121 | # if the error file is empty, remove it. 122 | if [[ ! -s "${tempfolder}/FAIL/${name}.error" ]]; then 123 | rm "${tempfolder}/FAIL/${name}.error" 124 | fi 125 | } 126 | 127 | recheckFailedChecks() { 128 | pushd "${tempfolder}/FAIL" >/dev/null 2>&1 129 | failFiles=(*.status) 130 | failCount=${#failFiles[@]} 131 | if [[ failCount -gt 0 ]]; then 132 | echo -e "\e[1;31mFailed checks, re-checking after ${flapRetry} seconds.\e[0m" >&2 # output to stderr 133 | sleep "${flapRetry}"; 134 | for filename in "${failFiles[@]}"; do 135 | if [[ -r $filename ]]; then 136 | filenameWithoutExt=${filename%.*} 137 | if [[ "$(jobs | wc -l)" -ge ${maxConcurrentCurls} ]] ; then # run 12 curl commands at max parallel 138 | wait -n 139 | fi 140 | doRequest "${filenameWithoutExt}" "${urls[${filenameWithoutExt}]}" 141 | fi 142 | done 143 | wait 144 | fi 145 | popd >/dev/null 2>&1 146 | } 147 | 148 | 149 | writeOkayChecks() { 150 | echo "" 151 | echo "
" 152 | pushd "${tempfolder}/OK" >/dev/null 2>&1 153 | okFiles=(*.duration) 154 | okCount=${#okFiles[@]} 155 | if [[ okCount -gt 0 ]]; then 156 | for filename in "${okFiles[@]}"; do 157 | if [[ -r $filename ]]; then 158 | value="$(cat "$filename")" 159 | filenameWithoutExt=${filename%.*} 160 | echo '' 161 | echo "${filenameWithoutExt}" 162 | echo " (" 163 | echo "${value}" 164 | echo " ms)" 165 | echo "  " 166 | fi 167 | done 168 | fi 169 | popd >/dev/null 2>&1 170 | } 171 | 172 | urlencode() { 173 | local LANG=C 174 | local i='' 175 | local c='' 176 | local e='' 177 | for ((i=0; i<${#1}; i++)); do 178 | c=${1:$i:1} 179 | [[ "$c" =~ [a-zA-Z0-9\.\~\_\-] ]] || printf -v c '%%%02X' "'$c" 180 | e+="$c" 181 | done 182 | echo "$e" 183 | } 184 | 185 | doCallbackForFailedChecks() { 186 | # If the callback URL is empty, don't do anything. 187 | if [[ -z "${callbackURL}" ]]; then 188 | return; 189 | fi 190 | 191 | pushd "${tempfolder}/FAIL" >/dev/null 2>&1 192 | failFiles=(*.status) 193 | failCount=${#failFiles[@]} 194 | for filename in "${failFiles[@]}"; do 195 | if [[ -r $filename ]]; then 196 | filenameWithoutExt=${filename%.*} 197 | if [[ -r "${filenameWithoutExt}.error" ]]; then 198 | curlError="$(cat "${filenameWithoutExt}.error" 2>/dev/null)" 199 | else 200 | curlError="Status code does not match expected code" 201 | fi 202 | url="${urls[${filenameWithoutExt}]}" 203 | encodedUrl="$(urlencode ${url})" 204 | currentStatus="$(cat "${filename}")" 205 | expectedStatus="000" 206 | if [[ -z "${statuscode[${filenameWithoutExt}]}" ]]; then 207 | expectedStatus="${defaultExpectedStatusCode}" 208 | else 209 | expectedStatus="${statuscode[${filenameWithoutExt}]}" 210 | fi 211 | 212 | # If the callback URL is a slack webhook then structure payload as slack attachment message block instead 213 | slackRegex="^https\:\/\/hooks\.slack\.com" 214 | if [[ ${callbackURL} =~ ${slackRegex} ]]; then 215 | curlData="{\"attachments\":[{\"color\":\"e00000\",\"blocks\":[{\"type\":\"section\",\"text\":{\"type\":\"mrkdwn\",\"text\":\"*Resource Unavailable*\\n*url:* ${url}\\n*name:* ${filenameWithoutExt}\\n*expected_status:* ${expectedStatus}\\n*actual_status:* ${currentStatus}\\n*error:* ${curlError}\"}}]}]}" 216 | else 217 | curlData="{\"url\":\"${encodedUrl}\",\"name\":\"${filenameWithoutExt}\",\"expected_status\":\"${expectedStatus}\",\"actual_status\":\"${currentStatus}\",\"error\":\"${curlError}\"}"; 218 | fi 219 | 220 | curl --max-time "${defaultTimeOut}" --silent --show-error --insecure --output /dev/null --request POST \ 221 | -H "Content-Type: application/json" \ 222 | --data "${curlData}" \ 223 | "${callbackURL}" 224 | fi 225 | done 226 | popd >/dev/null 2>&1 227 | } 228 | 229 | writeFailedChecks() { 230 | pushd "${tempfolder}/FAIL" >/dev/null 2>&1 231 | failFiles=(*.status) 232 | failCount=${#failFiles[@]} 233 | if [[ failCount -gt 0 ]]; then 234 | echo '" 237 | echo '' 238 | echo '' 239 | echo '' 240 | echo '' 241 | echo '' 242 | echo '' 243 | for filename in "${failFiles[@]}"; do 244 | if [[ -r $filename ]]; then 245 | filenameWithoutExt=${filename%.*} 246 | if [[ -r "${filenameWithoutExt}.error" ]]; then 247 | curlError="$(cat "${filenameWithoutExt}.error" 2>/dev/null)" 248 | else 249 | curlError="Status code does not match expected code" 250 | fi 251 | status="$(cat "${filename}")" 252 | echo "" 264 | fi 265 | done 266 | echo "" 267 | echo "
NameHTTP Status/ExpectedError
" 253 | echo "${filenameWithoutExt}" 254 | echo "" 255 | echo "${status} / " 256 | if [[ -z "${statuscode[${filenameWithoutExt}]}" ]]; then 257 | echo "${defaultExpectedStatusCode}" 258 | else 259 | echo "${statuscode[${filenameWithoutExt}]}" 260 | fi 261 | echo "" 262 | echo "${curlError}" 263 | echo "
All failed checks were attempted again after ${flapRetry} seconds and failed again.
" 268 | else 269 | echo '" 272 | fi 273 | popd >/dev/null 2>&1 274 | } 275 | 276 | cleanupFailedCheckFiles() { 277 | pushd "${tempfolder}/FAIL" >/dev/null 2>&1 278 | errorFiles=(*.error) 279 | for filename in "${errorFiles[@]}"; do 280 | if [[ -r $filename ]]; then 281 | rm "${filename}" 282 | fi 283 | done 284 | 285 | statusFiles=(*.status) 286 | for filename in "${statusFiles[@]}"; do 287 | if [[ -r $filename ]]; then 288 | rm "${filename}" 289 | fi 290 | done 291 | popd >/dev/null 2>&1 292 | rmdir "${tempfolder}/FAIL" 293 | } 294 | 295 | cleanupOKCheckFiles() { 296 | pushd "${tempfolder}/OK" >/dev/null 2>&1 297 | okFiles=(*.duration) 298 | okCount=${#okFiles[@]} 299 | for filename in "${okFiles[@]}"; do 300 | if [[ -r $filename ]]; then 301 | rm "${filename}" 302 | fi 303 | done 304 | popd >/dev/null 2>&1 305 | rmdir "${tempfolder}/OK" 306 | } 307 | 308 | 309 | writeHeader() { 310 | echo '' 311 | echo '' 312 | echo "${title}" 313 | echo "" 314 | echo "
" 315 | echo "

${title}

" 316 | echo "
" 317 | echo "
" 318 | } 319 | 320 | writeFooter() { 321 | echo "
" 322 | echo "
" 323 | echo "
" 324 | echo "

Last check: " 325 | date 326 | echo "
Total duration: ${runtime} ms" 327 | echo "
Monitoring script by Remy van Elst. License: GNU AGPLv3. " 328 | echo "Source code" 329 | echo "

" 330 | echo "
" 331 | echo "" 332 | } 333 | 334 | 335 | # script start 336 | 337 | if [[ "${cgi}" = true ]]; then 338 | printf "Content-type: text/html\n\n"; 339 | fi 340 | 341 | # Total script duration timer 342 | start=$(${datecmd} +%s%3N) 343 | 344 | tmpdir=$(mktemp -d) 345 | tempfolder=${tmpdir:-/tmp/statusmon/} 346 | 347 | # try to create folders, if it fails, stop the script. 348 | mkdir -p "${tempfolder}/OK" || exit 1 349 | mkdir -p "${tempfolder}/FAIL" || exit 1 350 | 351 | pushd "${tempfolder}" >/dev/null 2>&1 352 | 353 | # Do the checks parallel 354 | for key in "${!urls[@]}" 355 | do 356 | value=${urls[$key]} 357 | if [[ "$(jobs | wc -l)" -ge ${maxConcurrentCurls} ]] ; then # run 12 curl commands at max parallel 358 | wait -n 359 | fi 360 | doRequest "$key" "$value" & 361 | done 362 | wait 363 | 364 | # Re-check any failed checks to prevent flapping 365 | recheckFailedChecks 366 | 367 | # header 368 | writeHeader 369 | 370 | # Failed checks, if any, go on top 371 | writeFailedChecks 372 | 373 | # Okay checks go below the failed checks 374 | writeOkayChecks 375 | 376 | # stop the total timer 377 | end=$(${datecmd} +%s%3N) 378 | runtime=$((end-start)) 379 | 380 | writeFooter 381 | 382 | # Execute the callback for any failed URL's 383 | doCallbackForFailedChecks 384 | 385 | # Cleanup the status files 386 | cleanupFailedCheckFiles 387 | cleanupOKCheckFiles 388 | 389 | popd >/dev/null 2>&1 390 | 391 | rmdir "${tempfolder}" 392 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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Patents. 460 | 461 | A "contributor" is a copyright holder who authorizes use under this 462 | License of the Program or a work on which the Program is based. The 463 | work thus licensed is called the contributor's "contributor version". 464 | 465 | A contributor's "essential patent claims" are all patent claims 466 | owned or controlled by the contributor, whether already acquired or 467 | hereafter acquired, that would be infringed by some manner, permitted 468 | by this License, of making, using, or selling its contributor version, 469 | but do not include claims that would be infringed only as a 470 | consequence of further modification of the contributor version. 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Remote Network Interaction; Use with the GNU General Public License. 541 | 542 | Notwithstanding any other provision of this License, if you modify the 543 | Program, your modified version must prominently offer all users 544 | interacting with it remotely through a computer network (if your version 545 | supports such interaction) an opportunity to receive the Corresponding 546 | Source of your version by providing access to the Corresponding Source 547 | from a network server at no charge, through some standard or customary 548 | means of facilitating copying of software. This Corresponding Source 549 | shall include the Corresponding Source for any work covered by version 3 550 | of the GNU General Public License that is incorporated pursuant to the 551 | following paragraph. 552 | 553 | Notwithstanding any other provision of this License, you have 554 | permission to link or combine any covered work with a work licensed 555 | under version 3 of the GNU General Public License into a single 556 | combined work, and to convey the resulting work. The terms of this 557 | License will continue to apply to the part which is the covered work, 558 | but the work with which it is combined will remain governed by version 559 | 3 of the GNU General Public License. 560 | 561 | 14. Revised Versions of this License. 562 | 563 | The Free Software Foundation may publish revised and/or new versions of 564 | the GNU Affero General Public License from time to time. Such new versions 565 | will be similar in spirit to the present version, but may differ in detail to 566 | address new problems or concerns. 567 | 568 | Each version is given a distinguishing version number. If the 569 | Program specifies that a certain numbered version of the GNU Affero General 570 | Public License "or any later version" applies to it, you have the 571 | option of following the terms and conditions either of that numbered 572 | version or of any later version published by the Free Software 573 | Foundation. If the Program does not specify a version number of the 574 | GNU Affero General Public License, you may choose any version ever published 575 | by the Free Software Foundation. 576 | 577 | If the Program specifies that a proxy can decide which future 578 | versions of the GNU Affero General Public License can be used, that proxy's 579 | public statement of acceptance of a version permanently authorizes you 580 | to choose that version for the Program. 581 | 582 | Later license versions may give you additional or different 583 | permissions. However, no additional obligations are imposed on any 584 | author or copyright holder as a result of your choosing to follow a 585 | later version. 586 | 587 | 15. Disclaimer of Warranty. 588 | 589 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 590 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 591 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 592 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 593 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 594 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 595 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 596 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 597 | 598 | 16. Limitation of Liability. 599 | 600 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 601 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 602 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 603 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 604 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 605 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 606 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 607 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 608 | SUCH DAMAGES. 609 | 610 | 17. Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these terms. 626 | 627 | To do so, attach the following notices to the program. It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | --------------------------------------------------------------------------------