/usr/share/games/bubbros/common/hostchooser.py is in bubbros 1.6.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | from socket import *
import time, select, sys
from errno import ETIMEDOUT
UDP_PORT = 8056
PING_MESSAGE = "pclient-game-ping"
PONG_MESSAGE = "server-game-pong"
def serverside_ping(only_port=None):
port = only_port or UDP_PORT
s = socket(AF_INET, SOCK_DGRAM)
try:
s.bind(('', port))
s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
return s
except error, e:
if only_port is None:
s = socket(AF_INET, SOCK_DGRAM)
s.bind(('', INADDR_ANY))
return s
else:
return None
def answer_ping(s, descr, addr, extra='', httpport=''):
try:
data, source = s.recvfrom(100)
except error, e:
print >> sys.stderr, 'ping error:', str(e)
return
if data == PING_MESSAGE:
print >> sys.stderr, "ping by", source
answer = '%s:%s:%s:%s:%s:%s' % (PONG_MESSAGE, descr,
addr[0], addr[1], extra, httpport)
s.sendto(answer, source)
else:
print >> sys.stderr, \
"unexpected data on UDP port %d by" % UDP_PORT, source
def pick(hostlist, delay=1):
s = socket(AF_INET, SOCK_DGRAM)
s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
for host in hostlist:
print >> sys.stderr, "* Looking for a server on %s... " % host
try:
s.sendto(PING_MESSAGE, (host, UDP_PORT))
except error, e:
print >> sys.stderr, 'send:', str(e)
continue
while 1:
iwtd, owtd, ewtd = select.select([s], [], [], delay)
if not iwtd:
break
try:
data, answer_from = s.recvfrom(200)
except error, e:
if e.args[0] != ETIMEDOUT:
print >> sys.stderr, 'recv:', str(e)
continue
break
data = data.split(':')
if len(data) >= 4 and data[0] == PONG_MESSAGE:
hostname = data[2] or answer_from[0]
try:
port = int(data[3])
except ValueError:
pass
else:
result = (hostname, port)
print >> sys.stderr, "* Picking %r at" % data[1], result
return result
print >> sys.stderr, "got an unexpected answer", data, "from", answer_from
print >> sys.stderr, "no server found."
raise SystemExit
def find_servers(hostlist=[('127.0.0.1', None), ('<broadcast>', None)],
tries=2, delay=0.5, verbose=1, port_needed=1):
import gamesrv
if verbose:
print >> sys.stderr, 'Looking for servers in the following list:'
for host, udpport in hostlist:
print >> sys.stderr, ' %s, UDP port %s' % (
host, udpport or ("%s (default)" % UDP_PORT))
events = {}
replies = []
s = socket(AF_INET, SOCK_DGRAM)
s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
for trynum in range(tries):
for host, udpport in hostlist:
try:
ipaddr = host
if host != '<broadcast>':
try:
ipaddr = gethostbyname(host)
except error, e:
print >> sys.stderr, 'gethostbyname:', str(e)
s.sendto(PING_MESSAGE, (ipaddr, udpport or UDP_PORT))
hostsend, hostrecv = events.setdefault(ipaddr, ([], []))
hostsend.append(time.time())
except error, e:
print >> sys.stderr, 'send:', str(e)
continue
endtime = time.time() + delay
while gamesrv.recursiveloop(endtime, [s]):
try:
data, answer_from = s.recvfrom(200)
except error, e:
if e.args[0] != ETIMEDOUT:
print >> sys.stderr, 'recv:', str(e)
continue
break
try:
ipaddr = gethostbyname(answer_from[0])
except error:
ipaddr = answer_from[0]
else:
hostsend, hostrecv = events.setdefault(ipaddr, ([], []))
hostrecv.append(time.time())
data = data.split(':')
if len(data) >= 4 and data[0] == PONG_MESSAGE:
try:
port = int(data[3])
except ValueError:
if port_needed:
continue
port = ''
if data[2]:
hostname = data[2]
realhostname = [hostname]
else:
hostname = answer_from[0]
realhostname = lazy_gethostbyaddr(hostname)
server = ':'.join(data[1:2]+data[4:])
replies.append((hostname, realhostname, port, server, ipaddr))
else:
print >> sys.stderr, "got an unexpected answer from", answer_from
servers = {}
aliases = {}
timeout = time.time() + 2.0 # wait for gethostbyaddr() for 2 seconds
while replies:
i = 0
now = time.time()
while i < len(replies):
hostname, realhostname, port, server, ipaddr = replies[i]
if realhostname:
hostname = realhostname[0] # got an answer
elif now < timeout:
i += 1 # must wait some more time
continue
result = (hostname, port)
servers[result] = server
aliases[hostname] = ipaddr
del replies[i]
if replies:
time.sleep(0.08) # time for gethostbyaddr() to finish
if verbose:
print >> sys.stderr, "%d answer(s):" % len(servers), servers.keys()
for host, port in servers.keys():
ping = None
ipaddr = aliases[host]
if ipaddr in events:
hostsend, hostrecv = events[ipaddr]
if len(hostsend) == len(hostrecv) == tries:
ping = min([t2-t1 for t1, t2 in zip(hostsend, hostrecv)])
servers[host, port] = (servers[host, port], ping)
sys.setcheckinterval(4096)
return servers
# ____________________________________________________________
HOSTNAMECACHE = {}
def _lazygetter(hostname, resultlst):
try:
try:
hostname = gethostbyaddr(hostname)[0]
if hostname == 'localhost':
from msgstruct import HOSTNAME as hostname
except error:
pass
finally:
resultlst.append(hostname)
def lazy_gethostbyaddr(hostname):
try:
return HOSTNAMECACHE[hostname]
except KeyError:
resultlst = HOSTNAMECACHE[hostname] = []
import thread
thread.start_new_thread(_lazygetter, (hostname, resultlst))
return resultlst
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