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241
bbs/bbsd.py
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241
bbs/bbsd.py
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#!/usr/bin/env python3
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"""txt3 BBS - telnet front-end for wap.txt3.net.
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Shares the SQLite database with the WML/XHTML site: one account works on all
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three front-ends, and multiplayer matches are cross-playable between them.
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Binds to the tailscale interface only by default.
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"""
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import os
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import socket
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import socketserver
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import sys
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import threading
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import time
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sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
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import bbsdb # noqa: E402
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from bbsdb import connect, q1, login, create_user, user_by_name, touch # noqa: E402
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from term import Term, Hangup # noqa: E402
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import boards # noqa: E402
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import games # noqa: E402
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import mud # noqa: E402
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import screens # noqa: E402
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HOST = os.environ.get("BBS_HOST", "100.127.96.105")
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PORT = int(os.environ.get("BBS_PORT", "12300"))
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MAX_SESSIONS = int(os.environ.get("BBS_MAX", "20"))
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_sessions = threading.BoundedSemaphore(MAX_SESSIONS)
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BANNER = r"""
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_ _ _____ ____ ____ ____
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| |___ _| |_|___ / | __ )| __ ) ___|
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| __\ \/ / __| |_ \ | _ \| _ \___ \
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| |_ > <| |_ ___) | | |_) | |_) |__) |
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\__/_/\_\\__|____/ |____/|____/____/
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"""
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def log(msg):
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sys.stdout.write("[%s] %s\n" % (time.strftime("%Y-%m-%d %H:%M:%S"), msg))
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sys.stdout.flush()
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def welcome(t, con):
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t.write(BANNER)
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motd = q1(con, "SELECT v FROM settings WHERE k='motd'")
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t.line(" " + (motd["v"] if motd else "Welcome!"))
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users = q1(con, "SELECT COUNT(*) c FROM users")["c"]
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posts = q1(con, "SELECT COUNT(*) c FROM posts")["c"]
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t.line(" %d members, %d posts. Also on the web: https://wap.txt3.net" % (users, posts))
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t.rule("=")
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def do_login(t, con):
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"""Returns a user row, or None if the caller gave up."""
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for _ in range(3):
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t.line("\n [L]ogin [N]ew user [G]uest look around [Q]uit")
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c = t.ask("\n> ").lower()
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if c.startswith("l"):
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name = t.ask(" Username: ", maxlen=16)
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if not name:
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continue
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pw = t.secret(" Password: ")
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u = login(con, name, pw)
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if u:
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t.line("\n Welcome back, %s." % u["username"])
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return u
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t.line(" Login failed (bad details, or account banned).")
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elif c.startswith("n"):
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u = do_signup(t, con)
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if u:
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return u
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elif c.startswith("g"):
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return "guest"
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elif c.startswith("q"):
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return None
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return None
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def do_signup(t, con):
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t.line("\n New account:")
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name = t.ask(" Choose a username (3-16, letters/digits/_): ", maxlen=16)
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if not name:
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return None
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if not name.replace("_", "").isalnum() or not 3 <= len(name) <= 16:
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t.line(" Invalid username.")
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return None
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if user_by_name(con, name):
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t.line(" That name is taken.")
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return None
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pw = t.secret(" Choose a password (min 4): ")
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if len(pw) < 4:
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t.line(" Too short.")
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return None
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if pw != t.secret(" Repeat password: "):
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t.line(" Passwords did not match.")
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return None
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uid = create_user(con, name, pw)
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if not uid:
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t.line(" Could not create the account (hashing failed).")
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return None
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t.line("\n Account created. It works on https://wap.txt3.net too.")
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return bbsdb.user_by_id(con, uid)
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def guest_menu(t, con):
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while True:
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t.header("GUEST - read only")
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t.line(" [F]orums (read) [U]ser list [S]cores [L]ogin/signup [Q]uit")
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c = t.ask("\nguest> ").lower()
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if c.startswith("f"):
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boards.forum_menu(t, con, {"id": -1, "is_admin": 0, "username": "guest"})
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elif c.startswith("u"):
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screens.userlist(t, con)
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elif c.startswith("s"):
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games.scores(t, con)
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elif c.startswith("l"):
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return "login"
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elif c.startswith("q") or c == "":
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return None
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def main_menu(t, con, me):
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while True:
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me = bbsdb.user_by_id(con, me["id"])
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if not me or me["is_banned"]:
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t.line("\n Your account is no longer active. Goodbye.")
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return
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touch(con, me["id"])
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n = bbsdb.unread(con, me["id"])
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t.header("MAIN MENU - %s%s" % (me["username"],
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" [admin]" if me["is_admin"] else ""))
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t.line(" [M]ail %s" % ("(%d unread)" % n if n else ""))
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t.line(" [F]orums")
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t.line(" [G]ames")
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t.line(" [D]ungeon - explore a shared world (also on the web)")
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t.line(" [P]rofile")
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t.line(" [U]ser list")
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if me["is_admin"]:
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t.line(" [A]dmin tools")
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t.line(" [Q]uit")
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c = t.ask("\nmain> ").lower()
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if c.startswith("m"):
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boards.mail_menu(t, con, me)
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elif c.startswith("f"):
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boards.forum_menu(t, con, me)
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elif c.startswith("g"):
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games.games_menu(t, con, me)
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elif c.startswith("d"):
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mud.mud_menu(t, con, me)
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elif c.startswith("p"):
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screens.profile_menu(t, con, me)
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elif c.startswith("u"):
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screens.userlist(t, con)
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elif c.startswith("a") and me["is_admin"]:
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screens.admin_menu(t, con, me)
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elif c.startswith("q"):
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return
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class Handler(socketserver.BaseRequestHandler):
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def handle(self):
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if not _sessions.acquire(blocking=False):
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try:
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self.request.sendall(b"\r\nBBS is full, try later.\r\n")
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self.request.close()
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except OSError:
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pass
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return
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con = None
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t = None
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ip = self.client_address[0]
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log("connect from %s" % ip)
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try:
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t = Term(self.request, self.client_address)
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con = connect()
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welcome(t, con)
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while True:
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who = do_login(t, con)
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if who is None:
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break
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if who == "guest":
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if guest_menu(t, con) == "login":
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continue
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break
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main_menu(t, con, who)
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break
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if t:
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t.line("\n Goodbye - 73s from txt3 BBS.\n")
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except Hangup:
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log("hangup %s" % ip)
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except Exception as e: # keep one session's bug local
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log("ERROR %s: %r" % (ip, e))
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try:
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t.line("\n Internal error - disconnecting.\n")
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except Exception:
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pass
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finally:
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if con is not None:
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try:
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con.close()
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except Exception:
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pass
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try:
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self.request.close()
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except OSError:
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pass
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_sessions.release()
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log("disconnect %s" % ip)
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class Server(socketserver.ThreadingTCPServer):
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allow_reuse_address = True
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daemon_threads = True
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address_family = socket.AF_INET
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def main():
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# Fail loudly if the shared database is not reachable.
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try:
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con = connect()
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con.execute("SELECT 1 FROM users LIMIT 1")
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con.close()
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except Exception as e:
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log("FATAL: cannot open database %s: %r" % (bbsdb.DB_PATH, e))
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return 1
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srv = Server((HOST, PORT), Handler)
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log("txt3 BBS listening on %s:%d (db=%s)" % (HOST, PORT, bbsdb.DB_PATH))
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try:
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srv.serve_forever()
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except KeyboardInterrupt:
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log("shutting down")
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finally:
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srv.server_close()
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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