Minimal web server using netcat

Question

I am trying to configure a minimal web server using netcat (nc). For example, when the browser calls localhost: 1500, it should show the result of the function (the date in the example below, but ultimately it will be a python or c program that gives some data). My small netcat web server should be while true loop in bash, maybe as simple as this:

while true ; do echo -e "HTTP/1.1 200 OK\n\n $(date)" | nc -l -p 1500 ; done 

When I try to do this, the browser shows the data currently available at the time of starting nc. I want the browser to display data the moment the browser requests it. How can I achieve this?

Answer 1

Try the following:

 while true ; do nc -l -p 1500 -c 'echo -e "HTTP/1.1 200 OK\n\n $(date)"'; done 

-c makes netcat execute the given command in the shell, so you can use echo. If you do not need an echo, use -e . For more information on this, try man nc . Please note that when using echo for your program ( date -replacement) there is no way to receive a browser request. Therefore, you probably finally want to do something like this:

 while true ; do nc -l -p 1500 -e /path/to/yourprogram ; done 

Where should yourprogram do protocol things like GET processing, sending HTTP 200, etc.

Answer 2

Donno, how and why, but I manage to find it, and it works for me, I had a problem, I wanted to return the result of bash

 $ while true; do { echo -e 'HTTP/1.1 200 OK\r\n'; sh test; } | nc -l 8080; done 

NOTE: This command was taken from: http://www.razvantudorica.com/08/web-server-in-one-line-of-bash

a bash script test is run and returns the result to the browser client connecting to the server executing this command on port 8080

My script makes this ATM

 $ nano test #!/bin/bash echo "************PRINT SOME TEXT***************\n" echo "Hello World!!!" echo "\n" echo "Resources:" vmstat -SM echo "\n" echo "Addresses:" echo "$(ifconfig)" echo "\n" echo "$(gpio readall)" 

and my web browser shows

 ************PRINT SOME TEXT*************** Hello World!!! Resources: procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- rb swpd free buff cache si so bi bo in cs us sy id wa 0 0 0 314 18 78 0 0 2 1 306 31 0 0 100 0 Addresses: eth0 Link encap:Ethernet HWaddr b8:27:eb:86:e8:c5 inet addr:192.168.1.83 Bcast:192.168.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:27734 errors:0 dropped:0 overruns:0 frame:0 TX packets:26393 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1924720 (1.8 MiB) TX bytes:3841998 (3.6 MiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) GPIOs: +----------+-Rev2-+------+--------+------+-------+ | wiringPi | GPIO | Phys | Name | Mode | Value | +----------+------+------+--------+------+-------+ | 0 | 17 | 11 | GPIO 0 | IN | Low | | 1 | 18 | 12 | GPIO 1 | IN | Low | | 2 | 27 | 13 | GPIO 2 | IN | Low | | 3 | 22 | 15 | GPIO 3 | IN | Low | | 4 | 23 | 16 | GPIO 4 | IN | Low | | 5 | 24 | 18 | GPIO 5 | IN | Low | | 6 | 25 | 22 | GPIO 6 | IN | Low | | 7 | 4 | 7 | GPIO 7 | IN | Low | | 8 | 2 | 3 | SDA | IN | High | | 9 | 3 | 5 | SCL | IN | High | | 10 | 8 | 24 | CE0 | IN | Low | | 11 | 7 | 26 | CE1 | IN | Low | | 12 | 10 | 19 | MOSI | IN | Low | | 13 | 9 | 21 | MISO | IN | Low | | 14 | 11 | 23 | SCLK | IN | Low | | 15 | 14 | 8 | TxD | ALT0 | High | | 16 | 15 | 10 | RxD | ALT0 | High | | 17 | 28 | 3 | GPIO 8 | ALT2 | Low | | 18 | 29 | 4 | GPIO 9 | ALT2 | Low | | 19 | 30 | 5 | GPIO10 | ALT2 | Low | | 20 | 31 | 6 | GPIO11 | ALT2 | Low | +----------+------+------+--------+------+-------+ 

just awesome!

Answer 3

Add -q 1 to the netcat command line:

 while true; do echo -e "HTTP/1.1 200 OK\n\n $(date)" | nc -l -p 1500 -q 1 done 

Answer 4

The problem you are facing is that nc does not know when the web client has completed its request so that it can respond to the request.
The web session should go something like this.

 TCP session is established. Browser Request Header: GET / HTTP/1.1 Browser Request Header: Host: www.google.com Browser Request Header: \n #Note: Browser is telling Webserver that the request header is complete. Server Response Header: HTTP/1.1 200 OK Server Response Header: Content-Type: text/html Server Response Header: Content-Length: 24 Server Response Header: \n #Note: Webserver is telling browser that response header is complete Server Message Body: <html>sample html</html> Server Message Body: \n #Note: Webserver is telling the browser that the requested resource is finished. The server closes the TCP session. 

Lines starting with "\ n" are simply empty lines with no space and contain nothing more than a new line character.

I have my bash httpd running xinetd, xinetd tutorial . It also logs the date, time, browser IP address and the entire browser request for the log file and calculates the Content-Length for the server header response.

 user@machine:/usr/local/bin# cat ./bash_httpd #!/bin/bash x=0; Log=$( echo -n "["$(date "+%F %T %Z")"] $REMOTE_HOST ")$( while read I[$x] && [ ${#I[$x]} -gt 1 ];do echo -n '"'${I[$x]} | sed -e's,.$,",'; let "x = $x + 1"; done ; ); echo $Log >> /var/log/bash_httpd Message_Body=$(echo -en '<html>Sample html</html>') echo -en "HTTP/1.0 200 OK\nContent-Type: text/html\nContent-Length: ${#Message_Body}\n\n$Message_Body" 

To add additional features, you can enable.

  METHOD=$(echo ${I[0]} |cut -d" " -f1) REQUEST=$(echo ${I[0]} |cut -d" " -f2) HTTP_VERSION=$(echo ${I[0]} |cut -d" " -f3) If METHOD = "GET" ]; then case "$REQUEST" in "/") Message_Body="HTML formatted home page stuff" ;; /who) Message_Body="HTML formatted results of who" ;; /ps) Message_Body="HTML formatted results of ps" ;; *) Message_Body= "Error Page not found header and content" ;; esac fi 

Happy beating!

Answer 5

Another way to do it

 while true; do (echo -e 'HTTP/1.1 200 OK\r\n'; echo -e "\n\tMy website has date function" ; echo -e "\t$(date)\n") | nc -lp 8080; done 

Test it with 2 HTTP requests with curl

In this example, 172.16.2.6 is the IP address of the server.

Server side

 admin@server:~$ while true; do (echo -e 'HTTP/1.1 200 OK\r\n'; echo -e "\n\tMy website has date function" ; echo -e "\t$(date)\n") | nc -lp 8080; done GET / HTTP/1.1 Host: 172.16.2.6:8080 User-Agent: curl/7.48.0 Accept: */* GET / HTTP/1.1 Host: 172.16.2.6:8080 User-Agent: curl/7.48.0 Accept: */* 

Client side

 user@client:~$ curl 172.16.2.6:8080 My website has date function Tue Jun 13 18:00:19 UTC 2017 user@client:~$ curl 172.16.2.6:8080 My website has date function Tue Jun 13 18:00:24 UTC 2017 user@client:~$ 

If you want to execute another command, feel free to replace $ (date).

Answer 6

I had the same problem / issue, but nothing here worked for me (or I didn’t understand everything), so this is my solution.

I submit my minimum_http_server.sh file (working with my / bin / bash (4.3.11) but not / bin / sh due to redirection):

 rm -f out mkfifo out trap "rm -f out" EXIT while true do cat out | nc -l 1500 > >( # parse the netcat output, to build the answer redirected to the pipe "out". export REQUEST= while read -r line do line=$(echo "$line" | tr -d '\r\n') if echo "$line" | grep -qE '^GET /' # if line starts with "GET /" then REQUEST=$(echo "$line" | cut -d ' ' -f2) # extract the request elif [ -z "$line" ] # empty line / end of request then # call a script here # Note: REQUEST is exported, so the script can parse it (to answer 200/403/404 status code + content) ./a_script.sh > out fi done ) done 

And my a_script.sh (with your need):

 #!/bin/bash echo -e "HTTP/1.1 200 OK\r" echo "Content-type: text/html" echo date 

Answer 7

 mkfifo pipe; while true ; do #use read line from pipe to make it blocks before request comes in, #this is the key. { read line<pipe;echo -e "HTTP/1.1 200 OK\r\n";echo $(date); } | nc -l -q 0 -p 8080 > pipe; done 

Answer 8

Here is the beauty of the small bash web server , I found it online and forked a copy and messed it up a bit - it uses socat or netcat I tested it with socat - it is standalone in one-script and generates its own configuration file and icon.

By default, it starts as a browser with web browser support, but it is easily configured with a configuration file for any logic. For files, it transfers images and music (mp3), video (mp4, avi, etc.). I tested streaming of various file types on Linux, Windows and Android devices, including smartwatch!

I think these threads are better than VLC. I found this useful for transferring files to remote clients that do not have access outside of a web browser, for example. An Android smartwatch without worrying about physically connecting to a USB port.

If you want to try, just copy and paste it into a file called bashttpd, then run it on the host using $> bashttpd -s

Then you can go to any other computer (suppose the firewall does not block incoming tcp connections to port 8080 - the default port, you can change the port to whatever you want using the global variables at the top of the script). http://bashttpd_server_ip:8080

 #!/usr/bin/env bash ############################################################################# ########################################################################### ### bashttpd v 1.12 ### ### Original author: Avleen Vig, 2012 ### Reworked by: Josh Cartwright, 2012 ### Modified by: AMDanischewski, 2015 ### Issues: If you find any issues leave me a comment at ### http://scriptsandoneliners.blogspot.com/2015/04/bashttpd-self-contained-bash-webserver.html ### ### This is a simple Bash based webserver. By default it will browse files and allows for ### retrieving binary files. ### ### It has been tested successfully to view and stream files including images, mp3s, ### mp4s and downloading files of any type including binary and compressed files via ### any web browser. ### ### Successfully tested on various browsers on Windows, Linux and Android devices (including the ### Android Smartwatch ZGPAX S8). ### ### It handles favicon requests by hardcoded favicon image -- by default a marathon ### runner; change it to whatever you want! By base64 encoding your favorit favicon ### and changing the global variable below this header. ### ### Make sure if you have a firewall it allows connections to the port you plan to ### listen on (8080 by default). ### ### By default this program will allow for the browsing of files from the ### computer where it is run. ### ### Make sure you are allowed connections to the port you plan to listen on ### (8080 by default). Then just drop it on a host machine (that has bash) ### and start it up like this: ### ### $192.168.1.101> bashttpd -s ### ### On the remote machine you should be able to browse and download files from the host ### server via any web browser by visiting: ### ### http://192.168.1.101:8080 ### #### This program requires (to work to full capacity) by default: ### socat or netcat (w/ '-e' option - on Ubuntu netcat-traditional) ### tree - useful for pretty directory listings ### If you are using socat, you can type: bashttpd -s ### ### to start listening on the LISTEN_PORT (default is 8080), you can change ### the port below. ### Eg nc -lp 8080 -e ./bashttpd ## <-- If your nc has the -e option. ### Eg nc.traditional -lp 8080 -e ./bashttpd ### Eg bashttpd -s -or- socat TCP4-LISTEN:8080,fork EXEC:bashttpd ### ### Copyright (C) 2012, Avleen Vig <[e-mail]> ### ### Permission is hereby granted, free of charge, to any person obtaining a copy of ### this software and associated documentation files (the "Software"), to deal in ### the Software without restriction, including without limitation the rights to ### use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of ### the Software, and to permit persons to whom the Software is furnished to do so, ### subject to the following conditions: ### ### The above copyright notice and this permission notice shall be included in all ### copies or substantial portions of the Software. ### ### THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ### IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS ### FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR ### COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER ### IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN ### CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ### ########################################################################### ############################################################################# ### CHANGE THIS TO WHERE YOU WANT THE CONFIGURATION FILE TO RESIDE declare -r BASHTTPD_CONF="/tmp/bashttpd.conf" ### CHANGE THIS IF YOU WOULD LIKE TO LISTEN ON A DIFFERENT PORT declare -i LISTEN_PORT=8080 ## If you are on AIX, IRIX, Solaris, or a hardened system redirecting ## to /dev/random will probably break, you can change it to /dev/null. declare -a DUMP_DEV="/dev/random" ## Just base64 encode your favorite favicon and change this to whatever you want. declare -r FAVICON="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" declare -i DEBUG=1 declare -i VERBOSE=0 declare -a REQUEST_HEADERS declare REQUEST_URI="" declare -a HTTP_RESPONSE=( [200]="OK" [400]="Bad Request" [403]="Forbidden" [404]="Not Found" [405]="Method Not Allowed" [500]="Internal Server Error") declare DATE=$(date +"%a, %d %b %Y %H:%M:%S %Z") declare -a RESPONSE_HEADERS=( "Date: $DATE" "Expires: $DATE" "Server: Slash Bin Slash Bash" ) function warn() { ((${VERBOSE})) && echo "WARNING: $@" >&2; } function chk_conf_file() { [ -r "${BASHTTPD_CONF}" ] || { cat >"${BASHTTPD_CONF}" <<'EOF' # # bashttpd.conf - configuration for bashttpd # # The behavior of bashttpd is dictated by the evaluation # of rules specified in this configuration file. Each rule # is evaluated until one is matched. If no rule is matched, # bashttpd will serve a 500 Internal Server Error. # # The format of the rules are: # on_uri_match REGEX command [args] # unconditionally command [args] # # on_uri_match: # On an incoming request, the URI is checked against the specified # (bash-supported extended) regular expression, and if encounters a match the # specified command is executed with the specified arguments. # # For additional flexibility, on_uri_match will also pass the results of the # regular expression match, ${BASH_REMATCH[@]} as additional arguments to the # command. # # unconditionally: # Always serve via the specified command. Useful for catchall rules. # # The following commands are available for use: # # serve_file FILE # Statically serves a single file. # # serve_dir_with_tree DIRECTORY # Statically serves the specified directory using 'tree'. It must be # installed and in the PATH. # # serve_dir_with_ls DIRECTORY # Statically serves the specified directory using 'ls -al'. # # serve_dir DIRECTORY # Statically serves a single directory listing. Will use 'tree' if it is # installed and in the PATH, otherwise, 'ls -al' # # serve_dir_or_file_from DIRECTORY # Serves either a directory listing (using serve_dir) or a file (using # serve_file). Constructs local path by appending the specified root # directory, and the URI portion of the client request. # # serve_static_string STRING # Serves the specified static string with Content-Type text/plain. # # Examples of rules: # # on_uri_match '^/issue$' serve_file "/etc/issue" # # When a client requested URI matches the string '/issue', serve them the # contents of /etc/issue # # on_uri_match 'root' serve_dir / # # When a client requested URI has the word 'root' in it, serve up # a directory listing of / # # DOCROOT=/var/www/html # on_uri_match '/(.*)' serve_dir_or_file_from "$DOCROOT" # When any URI request is made, attempt to serve a directory listing # or file content based on the request URI, by mapping URI to local # paths relative to the specified "$DOCROOT" # #unconditionally serve_static_string 'Hello, world! You can configure bashttpd by modifying bashttpd.conf.' DOCROOT=/ on_uri_match '/(.*)' serve_dir_or_file_from # More about commands: # # It is possible to somewhat easily write your own commands. An example # may help. The following example will serve "Hello, $x!" whenever # a client sends a request with the URI /say_hello_to/$x: # # serve_hello() { # add_response_header "Content-Type" "text/plain" # send_response_ok_exit <<< "Hello, $2!" # } # on_uri_match '^/say_hello_to/(.*)$' serve_hello # # Like mentioned before, the contents of ${BASH_REMATCH[@]} are passed # to your command, so its possible to use regular expression groups # to pull out info. # # With this example, when the requested URI is /say_hello_to/Josh, serve_hello # is invoked with the arguments '/say_hello_to/Josh' 'Josh', # (${BASH_REMATCH[0]} is always the full match) EOF warn "Created bashttpd.conf using defaults. Please review and configure bashttpd.conf before running bashttpd again." # exit 1 } } function recv() { ((${VERBOSE})) && echo "< $@" >&2; } function send() { ((${VERBOSE})) && echo "> $@" >&2; echo "$*"; } function add_response_header() { RESPONSE_HEADERS+=("$1: $2"); } function send_response_binary() { local code="$1" local file="${2}" local transfer_stats="" local tmp_stat_file="/tmp/_send_response_$$_" send "HTTP/1.0 $1 ${HTTP_RESPONSE[$1]}" for i in "${RESPONSE_HEADERS[@]}"; do send "$i" done send if ((${VERBOSE})); then ## Use dd since it handles null bytes dd 2>"${tmp_stat_file}" < "${file}" transfer_stats=$(<"${tmp_stat_file}") echo -en ">> Transferred: ${file}\n>> $(awk '/copied/{print}' <<< "${transfer_stats}")\n" >&2 rm "${tmp_stat_file}" else ## Use dd since it handles null bytes dd 2>"${DUMP_DEV}" < "${file}" fi } function send_response() { local code="$1" send "HTTP/1.0 $1 ${HTTP_RESPONSE[$1]}" for i in "${RESPONSE_HEADERS[@]}"; do send "$i" done send while IFS= read -r line; do send "${line}" done } function send_response_ok_exit() { send_response 200; exit 0; } function send_response_ok_exit_binary() { send_response_binary 200 "${1}"; exit 0; } function fail_with() { send_response "$1" <<< "$1 ${HTTP_RESPONSE[$1]}"; exit 1; } function serve_file() { local file="$1" local CONTENT_TYPE="" case "${file}" in *\.css) CONTENT_TYPE="text/css" ;; *\.js) CONTENT_TYPE="text/javascript" ;; *) CONTENT_TYPE=$(file -b --mime-type "${file}") ;; esac add_response_header "Content-Type" "${CONTENT_TYPE}" CONTENT_LENGTH=$(stat -c'%s' "${file}") add_response_header "Content-Length" "${CONTENT_LENGTH}" ## Use binary safe transfer method since text doesn't break. send_response_ok_exit_binary "${file}" } function serve_dir_with_tree() { local dir="$1" tree_vers tree_opts basehref x ## HTML 5 compatible way to avoid tree html from generating favicon ## requests in certain browsers, such as browsers in android smartwatches. =) local no_favicon=" <link href=\"data:image/x-icon;base64,${FAVICON}\" rel=\"icon\" type=\"image/x-icon\" />" local tree_page="" local base_server_path="/${2%/}" [ "$base_server_path" = "/" ] && base_server_path=".." local tree_opts="--du -h -a --dirsfirst" add_response_header "Content-Type" "text/html" # The --du option was added in 1.6.0. "/${2%/*}" read _ tree_vers x < <(tree --version) tree_page=$(tree -H "$base_server_path" -L 1 "${tree_opts}" -D "${dir}") tree_page=$(sed "5 i ${no_favicon}" <<< "${tree_page}") [[ "${tree_vers}" == v1.6* ]] send_response_ok_exit <<< "${tree_page}" } function serve_dir_with_ls() { local dir="$1" add_response_header "Content-Type" "text/plain" send_response_ok_exit < \ <(ls -la "${dir}") } function serve_dir() { local dir="$1" # If `tree` is installed, use that for pretty output. which tree &>"${DUMP_DEV}" && \ serve_dir_with_tree "$@" serve_dir_with_ls "$@" fail_with 500 } function urldecode() { [ "${1%/}" = "" ] && echo "/" || echo -e "$(sed 's/%\([[:xdigit:]]\{2\}\)/\\\x\1/g' <<< "${1%/}")"; } function serve_dir_or_file_from() { local URL_PATH="${1}/${3}" shift URL_PATH=$(urldecode "${URL_PATH}") [[ $URL_PATH == *..* ]] && fail_with 400 # Serve index file if exists in requested directory [[ -d "${URL_PATH}" && -f "${URL_PATH}/index.html" && -r "${URL_PATH}/index.html" ]] && \ URL_PATH="${URL_PATH}/index.html" if [[ -f "${URL_PATH}" ]]; then [[ -r "${URL_PATH}" ]] && \ serve_file "${URL_PATH}" "$@" || fail_with 403 elif [[ -d "${URL_PATH}" ]]; then [[ -x "${URL_PATH}" ]] && \ serve_dir "${URL_PATH}" "$@" || fail_with 403 fi fail_with 404 } function serve_static_string() { add_response_header "Content-Type" "text/plain" send_response_ok_exit <<< "$1" } function on_uri_match() { local regex="$1" shift [[ "${REQUEST_URI}" =~ $regex ]] && \ "$@" "${BASH_REMATCH[@]}" } function unconditionally() { "$@" "$REQUEST_URI"; } function main() { local recv="" local line="" local REQUEST_METHOD="" local REQUEST_HTTP_VERSION="" chk_conf_file [[ ${UID} = 0 ]] && warn "It is not recommended to run bashttpd as root." # Request-Line HTTP RFC 2616 $5.1 read -r line || fail_with 400 line=${line%%$'\r'} recv "${line}" read -r REQUEST_METHOD REQUEST_URI REQUEST_HTTP_VERSION <<< "${line}" [ -n "${REQUEST_METHOD}" ] && [ -n "${REQUEST_URI}" ] && \ [ -n "${REQUEST_HTTP_VERSION}" ] || fail_with 400 # Only GET is supported at this time [ "${REQUEST_METHOD}" = "GET" ] || fail_with 405 while IFS= read -r line; do line=${line%%$'\r'} recv "${line}" # If we've reached the end of the headers, break. [ -z "${line}" ] && break REQUEST_HEADERS+=("${line}") done } if [[ ! -z "{$1}" ]] && [ "${1}" = "-s" ]; then socat TCP4-LISTEN:${LISTEN_PORT},fork EXEC:"${0}" else main source "${BASHTTPD_CONF}" fail_with 500 fi / 6Ch1P + Vl9f / jIzc / 3572f + CgNr / fnzP / 3l01f + Ih9r / h4TZ / 8fN4 // P1Oj / 3uPr / 7O + 1v + xu9X / u8XY #!/usr/bin/env bash ############################################################################# ########################################################################### ### bashttpd v 1.12 ### ### Original author: Avleen Vig, 2012 ### Reworked by: Josh Cartwright, 2012 ### Modified by: AMDanischewski, 2015 ### Issues: If you find any issues leave me a comment at ### http://scriptsandoneliners.blogspot.com/2015/04/bashttpd-self-contained-bash-webserver.html ### ### This is a simple Bash based webserver. By default it will browse files and allows for ### retrieving binary files. ### ### It has been tested successfully to view and stream files including images, mp3s, ### mp4s and downloading files of any type including binary and compressed files via ### any web browser. ### ### Successfully tested on various browsers on Windows, Linux and Android devices (including the ### Android Smartwatch ZGPAX S8). ### ### It handles favicon requests by hardcoded favicon image -- by default a marathon ### runner; change it to whatever you want! By base64 encoding your favorit favicon ### and changing the global variable below this header. ### ### Make sure if you have a firewall it allows connections to the port you plan to ### listen on (8080 by default). ### ### By default this program will allow for the browsing of files from the ### computer where it is run. ### ### Make sure you are allowed connections to the port you plan to listen on ### (8080 by default). Then just drop it on a host machine (that has bash) ### and start it up like this: ### ### $192.168.1.101> bashttpd -s ### ### On the remote machine you should be able to browse and download files from the host ### server via any web browser by visiting: ### ### http://192.168.1.101:8080 ### #### This program requires (to work to full capacity) by default: ### socat or netcat (w/ '-e' option - on Ubuntu netcat-traditional) ### tree - useful for pretty directory listings ### If you are using socat, you can type: bashttpd -s ### ### to start listening on the LISTEN_PORT (default is 8080), you can change ### the port below. ### Eg nc -lp 8080 -e ./bashttpd ## <-- If your nc has the -e option. ### Eg nc.traditional -lp 8080 -e ./bashttpd ### Eg bashttpd -s -or- socat TCP4-LISTEN:8080,fork EXEC:bashttpd ### ### Copyright (C) 2012, Avleen Vig <[e-mail]> ### ### Permission is hereby granted, free of charge, to any person obtaining a copy of ### this software and associated documentation files (the "Software"), to deal in ### the Software without restriction, including without limitation the rights to ### use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of ### the Software, and to permit persons to whom the Software is furnished to do so, ### subject to the following conditions: ### ### The above copyright notice and this permission notice shall be included in all ### copies or substantial portions of the Software. ### ### THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ### IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS ### FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR ### COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER ### IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN ### CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ### ########################################################################### ############################################################################# ### CHANGE THIS TO WHERE YOU WANT THE CONFIGURATION FILE TO RESIDE declare -r BASHTTPD_CONF="/tmp/bashttpd.conf" ### CHANGE THIS IF YOU WOULD LIKE TO LISTEN ON A DIFFERENT PORT declare -i LISTEN_PORT=8080 ## If you are on AIX, IRIX, Solaris, or a hardened system redirecting ## to /dev/random will probably break, you can change it to /dev/null. declare -a DUMP_DEV="/dev/random" ## Just base64 encode your favorite favicon and change this to whatever you want. declare -r FAVICON="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" declare -i DEBUG=1 declare -i VERBOSE=0 declare -a REQUEST_HEADERS declare REQUEST_URI="" declare -a HTTP_RESPONSE=( [200]="OK" [400]="Bad Request" [403]="Forbidden" [404]="Not Found" [405]="Method Not Allowed" [500]="Internal Server Error") declare DATE=$(date +"%a, %d %b %Y %H:%M:%S %Z") declare -a RESPONSE_HEADERS=( "Date: $DATE" "Expires: $DATE" "Server: Slash Bin Slash Bash" ) function warn() { ((${VERBOSE})) && echo "WARNING: $@" >&2; } function chk_conf_file() { [ -r "${BASHTTPD_CONF}" ] || { cat >"${BASHTTPD_CONF}" <<'EOF' # # bashttpd.conf - configuration for bashttpd # # The behavior of bashttpd is dictated by the evaluation # of rules specified in this configuration file. Each rule # is evaluated until one is matched. If no rule is matched, # bashttpd will serve a 500 Internal Server Error. # # The format of the rules are: # on_uri_match REGEX command [args] # unconditionally command [args] # # on_uri_match: # On an incoming request, the URI is checked against the specified # (bash-supported extended) regular expression, and if encounters a match the # specified command is executed with the specified arguments. # # For additional flexibility, on_uri_match will also pass the results of the # regular expression match, ${BASH_REMATCH[@]} as additional arguments to the # command. # # unconditionally: # Always serve via the specified command. Useful for catchall rules. # # The following commands are available for use: # # serve_file FILE # Statically serves a single file. # # serve_dir_with_tree DIRECTORY # Statically serves the specified directory using 'tree'. It must be # installed and in the PATH. # # serve_dir_with_ls DIRECTORY # Statically serves the specified directory using 'ls -al'. # # serve_dir DIRECTORY # Statically serves a single directory listing. Will use 'tree' if it is # installed and in the PATH, otherwise, 'ls -al' # # serve_dir_or_file_from DIRECTORY # Serves either a directory listing (using serve_dir) or a file (using # serve_file). Constructs local path by appending the specified root # directory, and the URI portion of the client request. # # serve_static_string STRING # Serves the specified static string with Content-Type text/plain. # # Examples of rules: # # on_uri_match '^/issue$' serve_file "/etc/issue" # # When a client requested URI matches the string '/issue', serve them the # contents of /etc/issue # # on_uri_match 'root' serve_dir / # # When a client requested URI has the word 'root' in it, serve up # a directory listing of / # # DOCROOT=/var/www/html # on_uri_match '/(.*)' serve_dir_or_file_from "$DOCROOT" # When any URI request is made, attempt to serve a directory listing # or file content based on the request URI, by mapping URI to local # paths relative to the specified "$DOCROOT" # #unconditionally serve_static_string 'Hello, world! You can configure bashttpd by modifying bashttpd.conf.' DOCROOT=/ on_uri_match '/(.*)' serve_dir_or_file_from # More about commands: # # It is possible to somewhat easily write your own commands. An example # may help. The following example will serve "Hello, $x!" whenever # a client sends a request with the URI /say_hello_to/$x: # # serve_hello() { # add_response_header "Content-Type" "text/plain" # send_response_ok_exit <<< "Hello, $2!" # } # on_uri_match '^/say_hello_to/(.*)$' serve_hello # # Like mentioned before, the contents of ${BASH_REMATCH[@]} are passed # to your command, so its possible to use regular expression groups # to pull out info. # # With this example, when the requested URI is /say_hello_to/Josh, serve_hello # is invoked with the arguments '/say_hello_to/Josh' 'Josh', # (${BASH_REMATCH[0]} is always the full match) EOF warn "Created bashttpd.conf using defaults. Please review and configure bashttpd.conf before running bashttpd again." # exit 1 } } function recv() { ((${VERBOSE})) && echo "< $@" >&2; } function send() { ((${VERBOSE})) && echo "> $@" >&2; echo "$*"; } function add_response_header() { RESPONSE_HEADERS+=("$1: $2"); } function send_response_binary() { local code="$1" local file="${2}" local transfer_stats="" local tmp_stat_file="/tmp/_send_response_$$_" send "HTTP/1.0 $1 ${HTTP_RESPONSE[$1]}" for i in "${RESPONSE_HEADERS[@]}"; do send "$i" done send if ((${VERBOSE})); then ## Use dd since it handles null bytes dd 2>"${tmp_stat_file}" < "${file}" transfer_stats=$(<"${tmp_stat_file}") echo -en ">> Transferred: ${file}\n>> $(awk '/copied/{print}' <<< "${transfer_stats}")\n" >&2 rm "${tmp_stat_file}" else ## Use dd since it handles null bytes dd 2>"${DUMP_DEV}" < "${file}" fi } function send_response() { local code="$1" send "HTTP/1.0 $1 ${HTTP_RESPONSE[$1]}" for i in "${RESPONSE_HEADERS[@]}"; do send "$i" done send while IFS= read -r line; do send "${line}" done } function send_response_ok_exit() { send_response 200; exit 0; } function send_response_ok_exit_binary() { send_response_binary 200 "${1}"; exit 0; } function fail_with() { send_response "$1" <<< "$1 ${HTTP_RESPONSE[$1]}"; exit 1; } function serve_file() { local file="$1" local CONTENT_TYPE="" case "${file}" in *\.css) CONTENT_TYPE="text/css" ;; *\.js) CONTENT_TYPE="text/javascript" ;; *) CONTENT_TYPE=$(file -b --mime-type "${file}") ;; esac add_response_header "Content-Type" "${CONTENT_TYPE}" CONTENT_LENGTH=$(stat -c'%s' "${file}") add_response_header "Content-Length" "${CONTENT_LENGTH}" ## Use binary safe transfer method since text doesn't break. send_response_ok_exit_binary "${file}" } function serve_dir_with_tree() { local dir="$1" tree_vers tree_opts basehref x ## HTML 5 compatible way to avoid tree html from generating favicon ## requests in certain browsers, such as browsers in android smartwatches. =) local no_favicon=" <link href=\"data:image/x-icon;base64,${FAVICON}\" rel=\"icon\" type=\"image/x-icon\" />" local tree_page="" local base_server_path="/${2%/}" [ "$base_server_path" = "/" ] && base_server_path=".." local tree_opts="--du -h -a --dirsfirst" add_response_header "Content-Type" "text/html" # The --du option was added in 1.6.0. "/${2%/*}" read _ tree_vers x < <(tree --version) tree_page=$(tree -H "$base_server_path" -L 1 "${tree_opts}" -D "${dir}") tree_page=$(sed "5 i ${no_favicon}" <<< "${tree_page}") [[ "${tree_vers}" == v1.6* ]] send_response_ok_exit <<< "${tree_page}" } function serve_dir_with_ls() { local dir="$1" add_response_header "Content-Type" "text/plain" send_response_ok_exit < \ <(ls -la "${dir}") } function serve_dir() { local dir="$1" # If `tree` is installed, use that for pretty output. which tree &>"${DUMP_DEV}" && \ serve_dir_with_tree "$@" serve_dir_with_ls "$@" fail_with 500 } function urldecode() { [ "${1%/}" = "" ] && echo "/" || echo -e "$(sed 's/%\([[:xdigit:]]\{2\}\)/\\\x\1/g' <<< "${1%/}")"; } function serve_dir_or_file_from() { local URL_PATH="${1}/${3}" shift URL_PATH=$(urldecode "${URL_PATH}") [[ $URL_PATH == *..* ]] && fail_with 400 # Serve index file if exists in requested directory [[ -d "${URL_PATH}" && -f "${URL_PATH}/index.html" && -r "${URL_PATH}/index.html" ]] && \ URL_PATH="${URL_PATH}/index.html" if [[ -f "${URL_PATH}" ]]; then [[ -r "${URL_PATH}" ]] && \ serve_file "${URL_PATH}" "$@" || fail_with 403 elif [[ -d "${URL_PATH}" ]]; then [[ -x "${URL_PATH}" ]] && \ serve_dir "${URL_PATH}" "$@" || fail_with 403 fi fail_with 404 } function serve_static_string() { add_response_header "Content-Type" "text/plain" send_response_ok_exit <<< "$1" } function on_uri_match() { local regex="$1" shift [[ "${REQUEST_URI}" =~ $regex ]] && \ "$@" "${BASH_REMATCH[@]}" } function unconditionally() { "$@" "$REQUEST_URI"; } function main() { local recv="" local line="" local REQUEST_METHOD="" local REQUEST_HTTP_VERSION="" chk_conf_file [[ ${UID} = 0 ]] && warn "It is not recommended to run bashttpd as root." # Request-Line HTTP RFC 2616 $5.1 read -r line || fail_with 400 line=${line%%$'\r'} recv "${line}" read -r REQUEST_METHOD REQUEST_URI REQUEST_HTTP_VERSION <<< "${line}" [ -n "${REQUEST_METHOD}" ] && [ -n "${REQUEST_URI}" ] && \ [ -n "${REQUEST_HTTP_VERSION}" ] || fail_with 400 # Only GET is supported at this time [ "${REQUEST_METHOD}" = "GET" ] || fail_with 405 while IFS= read -r line; do line=${line%%$'\r'} recv "${line}" # If we've reached the end of the headers, break. [ -z "${line}" ] && break REQUEST_HEADERS+=("${line}") done } if [[ ! -z "{$1}" ]] && [ "${1}" = "-s" ]; then socat TCP4-LISTEN:${LISTEN_PORT},fork EXEC:"${0}" else main source "${BASHTTPD_CONF}" fail_with 500 fi 

Answer 9

Lol, super lame to hack, but at least curl and firefox accept it:

 while true ; do (dd if=/dev/zero count=10000;echo -e "HTTP/1.1\n\n $(date)") | nc -l 1500 ; done 

You better replace it with something right!

Oh yes, my nc was not exactly the same as yours, he did not like the -p option.

Answer 10

Type nc -h and see if you have the -e option. If so, you can create a script, for example:

script.sh

 echo -e "HTTP/1.1 200 OK\n\n $(date)" 

and run it like this:

 while true ; do nc -l -p 1500 -e script.sh; done 

Note that the -e option must be enabled at compile time.

Answer 11

I think that the problem that all of the listed solutions do not work is an integral part of the nature of the http service, each installed request has a different client and the response must be handled in a different context, each request must fork a new instance of the response ...

The current solution, I think, is -e from netcat , but I don’t know why this does not work ... maybe this is my version of nc that I am testing on openwrt ...

it works with socat ....

I try this https://github.com/avleen/bashttpd

and it works, but I have to run the shell script with this command.

 socat tcp-l:80,reuseaddr,fork EXEC:bashttpd & 

The socat and netcat samples on github do not work for me, but the socat I used is used.