A bash webserver

webserver.sh

#!/bin/bash

# Simple bash web server that serves files from ./static
PORT=${1:-8080}
STATIC_DIR="./static"
PIPE="/tmp/bashserver_$$"
NC_PID=""

# Cleanup on exit
cleanup() {
    echo -e "\nShutting down server..."
    # Kill any running nc process
    [[ -n "$NC_PID" ]] && kill "$NC_PID" 2>/dev/null
    # Kill all child processes
    pkill -P $$ 2>/dev/null
    rm -f "$PIPE"
    echo "Server stopped."
    exit 0
}
trap cleanup INT TERM EXIT

# Create named pipe
rm -f "$PIPE"
mkfifo "$PIPE"

echo "Starting server on port $PORT..."
echo "Serving files from $STATIC_DIR"
echo "Press Ctrl+C to stop"

get_mime_type() {
    case "$1" in
        *.html) echo "text/html" ;;
        *.css)  echo "text/css" ;;
        *.js)   echo "application/javascript" ;;
        *.json) echo "application/json" ;;
        *.png)  echo "image/png" ;;
        *.jpg|*.jpeg) echo "image/jpeg" ;;
        *.gif)  echo "image/gif" ;;
        *.svg)  echo "image/svg+xml" ;;
        *.txt)  echo "text/plain" ;;
        *)      echo "application/octet-stream" ;;
    esac
}

handle_request() {
    local request_line path method filepath mime_type content_length
    
    read -r request_line
    
    # Parse the request
    method=$(echo "$request_line" | cut -d' ' -f1)
    path=$(echo "$request_line" | cut -d' ' -f2)
    
    # Read and discard headers
    while read -r header; do
        header=$(echo "$header" | tr -d '\r')
        [ -z "$header" ] && break
    done
    
    # Default to index.html for root
    [ "$path" = "/" ] && path="/index.html"
    
    # Build file path
    filepath="$STATIC_DIR$path"
    
    # Security: prevent directory traversal
    if [[ "$path" == *".."* ]]; then
        printf "HTTP/1.1 403 Forbidden\r\nContent-Type: text/plain\r\nConnection: close\r\n\r\n403 Forbidden"
        return
    fi
    
    echo "[$(date)] $method $path" >&2
    
    if [ -f "$filepath" ]; then
        mime_type=$(get_mime_type "$filepath")
        content_length=$(wc -c < "$filepath" | tr -d ' ')
        
        printf "HTTP/1.1 200 OK\r\n"
        printf "Content-Type: %s\r\n" "$mime_type"
        printf "Content-Length: %s\r\n" "$content_length"
        printf "Connection: close\r\n"
        printf "\r\n"
        cat "$filepath"
    else
        local body="404 Not Found: $path"
        printf "HTTP/1.1 404 Not Found\r\n"
        printf "Content-Type: text/plain\r\n"
        printf "Content-Length: %s\r\n" "${#body}"
        printf "Connection: close\r\n"
        printf "\r\n"
        printf "%s" "$body"
    fi
}

# Main server loop using named pipe
while true; do
    nc -l "$PORT" < "$PIPE" | handle_request > "$PIPE" &
    NC_PID=$!
    wait $NC_PID 2>/dev/null
done