Executing shell commands via HTTP server
Clone or download

README.md

shell2http

GoDoc Build Status Coverage Status Report Card Docker Pulls Homebrew formula exists Snap Status

HTTP-server for executing shell commands. Designed for develop, prototype or remote control. Settings through two command line arguments, path and shell command. By default bind to :8080.

Usage

shell2http [options] /path "shell command" /path2 "shell command2" ...
options:
    -host="host"    : host IP for http server (default bind to all interfaces)
    -port=NNNN      : port for http server, 0 - to receive a random port (default 8080)
    -form           : parse query into environment vars, handle uploaded files
    -cgi            : run scripts in CGI-mode:
                      - set environment variables with HTTP-request information
                      - write POST-data to script STDIN (if is not set -form)
                      - parse headers from script (eg: "Location: URL\n\n")
    -export-vars=var: export environment vars ("VAR1,VAR2,...")
                      by default export PATH, HOME, LANG, USER, TMPDIR
    -export-all-vars: export all current environment vars
    -no-index       : don't generate index page
    -add-exit       : add /exit command
    -log=filename   : log filename, default - STDOUT
    -shell="shell"  : shell for execute command, "" - without shell (default "sh")
    -cache=N        : caching command out for N seconds
    -one-thread     : run each shell command in one thread
    -show-errors    : show the standard output even if the command exits with a non-zero exit code
    -include-stderr : include stderr to output (default is stdout only)
    -cert=cert.pem  : SSL certificate path (if specified -cert/-key options - run https server)
    -key=key.pem    : SSL private key path
    -basic-auth=""  : setup HTTP Basic Authentication ("user_name:password")
    -timeout=N	    : set timeout for execute shell command (in seconds)
    -version
    -help

In the -form mode, variables are available for shell scripts:

  • $v_NNN -- data from query parameter with name "NNN" (example: http://localhost:8080/path?NNN=123)
  • $filepath_ID -- uploaded file path, ID - id from <input type=file name=ID>, temporary uploaded file will be automatically deleted
  • $filename_ID -- uploaded file name from browser

The credentials for basic authentication may also be provided via the SH_BASIC_AUTH environment variable. You can specify the preferred HTTP-method (via METHOD: prefix for path): shell2http GET:/date date

Install

MacOS:

brew tap msoap/tools
brew install shell2http
# update:
brew upgrade shell2http

Using snap (Ubuntu or any Linux distribution with snap):

# install stable version:
sudo snap install shell2http

# install the latest version:
sudo snap install --edge shell2http

# update
sudo snap refresh shell2http

Notice: the snap-package has its own sandbox with the /bin, /usr/bin directories which are not equal to system-wide PATH directories.

Download binaries from: releases (OS X/Linux/Windows/RaspberryPi)

Docker users:

docker pull msoap/shell2http

Build from source:

go get -u github.com/msoap/shell2http
# set link to your PATH if needed:
ln -s $(go env GOPATH)/bin/shell2http ~/bin/shell2http

Examples

shell2http /top "top -l 1 | head -10"
shell2http /date date /ps "ps aux"
shell2http -export-all-vars /env 'printenv | sort' /env/path 'echo $PATH' /env/gopath 'echo $GOPATH'
shell2http -export-all-vars /shell_vars_json 'perl -MJSON -E "say to_json(\%ENV)"'
shell2http -export-vars=GOPATH /get 'echo $GOPATH'
HTML calendar for current year
shell2http /cal_html 'echo "<html><body><h1>Calendar</h1>Date: <b>$(date)</b><br><pre>$(cal $(date +%Y))</pre></body></html>"'
Get URL parameters (http://localhost:8080/form?from=10&to=100)
shell2http -form /form 'echo $v_from, $v_to'
CGI scripts
shell2http -cgi /user_agent 'echo $HTTP_USER_AGENT'
shell2http -cgi /set 'touch file; echo "Location: /another_path\n"' # redirect
shell2http -cgi /404 'echo "Status: 404"; echo; echo "404 page"' # custom HTTP code
Upload file
shell2http -form \
    GET:/form 'echo "<html><body><form method=POST action=/file enctype=multipart/form-data><input type=file name=uplfile><input type=submit></form>"' \
    POST:/file 'cat $filepath_uplfile > uploaded_file.dat; echo Ok'

Testing upload file with curl:

curl -i -F uplfile=@some/file/path 'http://localhost:8080/file'
Simple http-proxy server (for logging all URLs) Setup proxy as "http://localhost:8080/"
shell2http -log=/dev/null -cgi / 'echo $REQUEST_URI 1>&2; [ "$REQUEST_METHOD" == "POST" ] && post_param="-d@-"; curl -sL $post_param "$REQUEST_URI" -A "$HTTP_USER_AGENT"'
Test slow connection (http://localhost:8080/slow?duration=10)
shell2http -form /slow 'sleep ${v_duration:-1}; echo "sleep ${v_duration:-1} seconds"'
Proxy with cache in files (for debug with production API with rate limit) get `http://api.url/` as `http://localhost:8080/get?url=http://api.url/`
shell2http -form \
    /form 'echo "<html><form action=/get>URL: <input name=url><input type=submit>"' \
    /get 'MD5=$(printf "%s" $v_url | md5); cat cache_$MD5 || (curl -sL $v_url | tee cache_$MD5)'
Remote sound volume control (Mac OS)
shell2http /get  'osascript -e "output volume of (get volume settings)"' \
           /up   'osascript -e "set volume output volume (($(osascript -e "output volume of (get volume settings)")+10))"' \
           /down 'osascript -e "set volume output volume (($(osascript -e "output volume of (get volume settings)")-10))"'
Remote control for Vox.app player (Mac OS)
shell2http /play_pause 'osascript -e "tell application \"Vox\" to playpause" && echo ok' \
           /get_info 'osascript -e "tell application \"Vox\"" -e "\"Artist: \" & artist & \"\n\" & \"Album: \" & album & \"\n\" & \"Track: \" & track" -e "end tell"'
Get four random OS X wallpapers
shell2http /img 'cat "$(ls "/Library/Desktop Pictures/"*.jpg | ruby -e "puts STDIN.readlines.shuffle[0]")"' \
           /wallpapers 'echo "<html><h3>OS X Wallpapers</h3>"; seq 4 | xargs -I@ echo "<img src=/img?@ width=500>"'
Mock service with JSON API
curl "http://some-service/v1/call1" > 1.json
shell2http -cgi /call1 'cat 1.json' /call2 'echo "Content-Type: application/json\n"; echo "{\"error\": \"ok\"}"'
Windows example

Returns value of var for run in Windows cmd (http://localhost:8080/test?var=value123)

shell2http.exe -form /test "echo %v_var%"
With HTTP headers

Send custom HTTP headers:

shell2http -cgi / 'echo "Content-Type: application/javascript\n"; echo "{\"error\": \"ok\"}"'

On Windows:

shell2http.exe -cgi / "echo Content-Type: application/javascript& echo.& echo body"

More examples ...

Run from Docker-container

Example of test.Dockerfile for server for get current date:

FROM msoap/shell2http
# may be install some alpine packages:
# RUN apk add --no-cache ...
CMD ["/date", "date"]

Build and run container:

docker build -f test.Dockerfile -t date-server .
docker run --rm -p 8080:8080 date-server

Mirror docker repository: quay.io/msoap/shell2http:latest

SSL

Run https server:

shell2http -cert=./cert.pem -key=./key.pem ...

Generate self-signed certificate:

go run $(go env GOROOT)/src/crypto/tls/generate_cert.go -host localhost

See also

  • Emergency web server - spark
  • Share your terminal as a web application - gotty
  • Create Telegram bot from command-line - shell2telegram
  • A http daemon for local development - devd
  • Turn any program that uses STDIN/STDOUT into a WebSocket server - websocketd
  • The same tool configurable via JSON - webhook