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@upperstream
Last active May 2, 2024 23:40
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Simple HTTP Server (shell script)
#!/bin/sh
#
# Copyright (C) 2017 Upper Stream.
#
# See the bottom of this file for licensing conditions.
#
#set -x
set -e
# program name
program=${0##*/}
usage() {
cat <<-EOF
Usage:
$program [-p port] [docroot]
$program -H
-p port : specify listening port number; defaults to 10080
-H : print this help and quit
docroot : specify document root directory; defaults to the current directory
EOF
}
# default listening port
port=10080
# Configure in accordance with your environment
nc=$(command -v nc) || true
pid_file=/tmp/$program.pid
makefifo() {
name="$1"
mkfifo -m 0600 $name.fifo && echo $name.fifo
}
get_content_type() {
file="$1"
case $file in
*.html|*.htm) printf "text/html";;
*.txt|*.sh) printf "text/plain";;
*) printf "application/octet-stream";;
esac
}
respond() {
file="$1"
length=$(wc -c < $file)
length=${length##*[!0123456789]}
content_type=$(get_content_type $file)
{ cat $fifo2 > /dev/null; printf ""; } > $fifo1 &
printf "HTTP 200 OK\r\n\Content-Length: $length\r\nContent-Type: $content_type\r\n\r\n" >> $fifo1
case $content_type in
text/html|text/plain)
cat $file >> $fifo1
;;
*)
dd if=$file of=$fifo1 2> /dev/null
;;
esac
sleep 1; echo "end" > $fifo2
printf "200 $length"
}
execute_get() {
if [ "$1" = "/" ]; then
path="/index.html"
else
path=$1
fi
file=$docroot$path
dir=$(cd $(dirname $file); pwd)/
if echo $dir | grep ^$docroot/ > /dev/null && test -f $file; then
respond $file
else
message="$path not found\r\n"
printf "HTTP 404 Not Found\r\n\Content-Length: ${#message}\r\n\r\n$message" > $fifo1
printf "404 -"
fi
}
execute() {
method="$1"
path="$2"
case $method in
GET)
execute_get $path
;;
*)
message="$1 unsupported\r\n_"
message=${message%_}
printf "HTTP 501 Not Implemented\r\n\Content-Length: ${#message}\r\n\r\n$message" > $fifo
printf "501 -"
;;
esac
}
cleanup() {
rm $fifo1 $fifo2 $pid_file
}
interrupt() {
cleanup
exit 0
}
get_source_ip() {
source_ip="xxx.xxx.xxx.xxx"
if ! ifconfig=$(command -v ifconfig); then
printf $source_ip
return
fi
if ! sockstat=$(command -v sockstat) && ! netstat=$(command -v netstat); then
printf $source_ip
return
fi
if [ "$(uname)" = "Linux" ]; then
myips=$(
$ifconfig |
awk '/^[ \t]*inet / {print substr($2, 6)} /^[ \t]*inet6 / {print substr($3,0,index($3,"/") - 1)}'
)
else
myips=$($ifconfig | grep inet | cut -f2 -d' ')
fi
for ip in $myips; do
if [ "$sockstat"]; then
source=$($sockstat | grep -F "$ip:$port") || true
if [ "$source" ]; then
set -- $source
source_ip=${7%:*}
break
fi
elif [ "$netstat" ]; then
source=$($netstat -an | grep -F "$ip:$port") || true
if [ "$source" ]; then
set -- $source
source_ip=${5%:*}
break
fi
fi
done
printf "$source_ip"
}
parse() {
cr=$(printf "\r")
while read line; do
line=${line%$cr}
case "$line" in
GET*)
set -- $line
method=$1
path=$2
;;
Host:*)
host=${line#Host: }
;;
*:*)
;;
"")
source=$(get_source_ip)
date=$(date +'%d/%m/%Y:%H:%M:%S %z')
status_length=$(execute $method $path)
printf "$source - - [$date] $method \"http://$host$path\" $status_length\n"
trap - INT
exit
;;
*)
;;
esac
done
}
# dependency verification
for cmd in nc; do
test -z "$(eval echo $"$cmd")" && { echo "$0: \`$cmd\` not found"; exit 2; }
done
while getopts p:H opt; do
case $opt in
p) port=$OPTARG;;
H) usage; exit 255;;
*) usage; exit 255;;
esac
done
shift $((OPTIND-1))
if [ $# -eq 0 ]; then
docroot=.
else
docroot="$1"
fi
docroot=$(cd $docroot; pwd)
# FIFO to write HTTP response
if ! fifo1=$(makefifo /tmp/${0##*/}.$$.1); then
echo "$0: creating a named pipe failed. Already running?" 1>&2
exit 1
fi
# FIFO for internal event notification
if ! fifo2=$(makefifo /tmp/${0##*/}.$$.2); then
echo "$0: creating a named pipe failed. Already running?" 1>&2
exit 1
fi
trap interrupt INT
echo $$ > $pid_file
cat 1>&2 <<EOF
Simple HTTP Server
Listening at the port number $port.
Type ^C to quit.
EOF
while cat $fifo1 | $nc -l $port | parse; do
:
done
cleanup
exit
Copyright 2017 Upper Stream.
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.
@upperstream
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For development purpose only; never use in production environment.

  • Supports GET method only
  • No security consideration
  • Somewhat unstable
  • POSIX-compliant but requires nc command (or equivalent)

@upperstream
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Author

upperstream commented Aug 13, 2017

Added support for netstat where sockstat is unavailable.

The following tools are not mandatory but used for logging purpose (foreign ip address retrieval) only:

  • awk
  • ifconfig
  • netstat
  • sockstat

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