author | Tero Marttila <terom@fixme.fi> |
Sat, 26 Sep 2009 21:52:06 +0300 | |
changeset 54 | e7c136812b0d |
parent 48 | ee7ade660c0b |
child 55 | 99c4344a35ce |
permissions | -rw-r--r-- |
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#!/usr/bin/env python |
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""" |
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Simple (limited) netcat-like example, implemented using the socket/lib.event2 layer. |
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""" |
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|
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from qmsk.net.socket import socket, address |
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from qmsk.net.socket.constants import * |
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|
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from qmsk.net.lib.event2 import base, event |
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from qmsk.net.lib.event2.constants import * |
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from qmsk.net.lib.event2.event import CallbackEvent as cb_event |
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|
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import sys, os, fcntl, errno |
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import optparse |
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# global options |
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options = None |
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|
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# global event_base |
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ev_base = base.event_base() |
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|
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def parse_argv (argv) : |
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global options |
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prog = argv.pop(0) |
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parser = optparse.OptionParser(prog=prog) |
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|
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parser.add_option('-4', "--ipv4", help="Force AF_INET", action='store_true') |
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parser.add_option('-6', "--ipv6", help="Force AF_INET6", action='store_true') |
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parser.add_option('-v', "--verbose", help="Display status output", action='store_true') |
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parser.add_option('-d', "--debug", help="Display extra output", action='store_true') |
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parser.add_option('-w', "--timeout", help="Timeout for connect()", type='float') |
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|
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options, args = parser.parse_args(argv) |
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|
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if options.ipv4 and options.ipv6 : |
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raise Exception("-4 and -6 are mutually exclusive!") |
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if options.debug : |
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# enable both |
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options.verbose = True |
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|
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return args |
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def log_msg (prefix, msg, *args) : |
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if args : |
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msg = msg % args |
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sys.stderr.write("%s %s\n" % (prefix, msg)) |
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def log_err (msg, *args) : |
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log_msg('!!!', msg, *args) |
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def log_warn (msg, *args) : |
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log_msg('+++', msg, *args) |
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def log_info (msg, *args) : |
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if options.verbose : |
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log_msg('***', msg, *args) |
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|
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def log_debug (msg, *args) : |
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if options.debug : |
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log_msg('---', msg, *args) |
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|
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def setnonblocking (file) : |
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""" |
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Set the non-blocking IO flag on the given file object |
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""" |
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|
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fcntl.fcntl(file.fileno(), fcntl.F_SETFL, os.O_NONBLOCK) |
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|
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def sock_connect (host, port, family, socktype) : |
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""" |
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Try and perform a series of non-blocking connects to the given host:port using the given family and socktype, |
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yielding a series of socket objects. |
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""" |
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|
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for ai in address.getaddrinfo(host, port, family, socktype) : |
54 | 82 |
log_info("sock_connect: ai: %s", ai) |
48
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|
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# build socket |
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85 |
try : |
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86 |
# construct |
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log_debug("sock_connect: socket(%d, %d, %d)", ai.family, ai.socktype, ai.protocol) |
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sock = socket.socket(ai.family, ai.socktype, ai.protocol) |
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log_debug("sock_connect: socket=%s", sock) |
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|
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# set nonblock mode |
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log_debug("sock_connect: setnonblocking(%s)", sock) |
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setnonblocking(sock) |
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|
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# start connect |
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try : |
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log_debug("sock_connect: connect(%s)", ai.addr) |
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sock.connect(ai.addr) |
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|
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100 |
except OSError, e : |
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if e.errno != errno.EINPROGRESS : |
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102 |
raise |
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103 |
|
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104 |
else : |
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105 |
# XXX: wut??? |
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106 |
log_warn("sock_connect: connect: didn't return EINPROGRESS") |
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107 |
|
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108 |
except OSError, e : |
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109 |
# fsck |
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log_warn("sock_connect: %s: %s", ai.addr, e) |
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111 |
|
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112 |
else : |
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113 |
# yay |
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114 |
yield sock |
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115 |
|
54 | 116 |
def on_connect (ev, events, sock, sock_iter) : |
48
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117 |
""" |
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118 |
Outbound connect EV_WRITE callback, i.e. connection failed or was established |
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119 |
""" |
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120 |
|
54 | 121 |
log_debug("on_connect: ev=%r, events=%#x", ev, events) |
122 |
||
123 |
# test for timeout |
|
124 |
if events & EV_TIMEOUT : |
|
125 |
log_warn("on_connect: connect failed, timeout") |
|
126 |
||
127 |
# keep trying |
|
128 |
return client_connect_next(sock_iter) |
|
129 |
||
130 |
||
131 |
# test for errno |
|
132 |
err = sock.getsockopt_int(SOL_SOCKET, SO_ERROR) |
|
133 |
||
134 |
if err : |
|
135 |
# fail |
|
136 |
log_warn("on_connect: connect failed, errno=%d", err) |
|
137 |
||
138 |
# keep trying |
|
139 |
return client_connect_next(sock_iter) |
|
140 |
||
141 |
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142 |
# ok, connected |
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143 |
log_info("on_connect: connected") |
|
144 |
||
48
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145 |
|
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146 |
def client_connect_next (sock_iter) : |
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147 |
""" |
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148 |
Attempt to run the given connect operation, on the given iterable of sockets. |
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149 |
""" |
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150 |
|
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151 |
for sock in sock_iter : |
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152 |
# pend for writing |
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153 |
log_debug("client_connect_next: cb_event(%d, EV_WRITE, on_connect, %r)", sock.fd, sock) |
54 | 154 |
ev = cb_event(ev_base, sock.fd, EV_WRITE, on_connect, sock, sock_iter) |
48
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155 |
|
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156 |
# wait specified timeout |
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157 |
log_debug("client_connect_next: %r: add(%s)", ev, options.timeout) |
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158 |
ev.add(options.timeout) |
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159 |
|
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160 |
# ok |
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161 |
break |
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162 |
|
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163 |
else : |
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164 |
# fail, ran out of addresses to try |
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165 |
log_err("client_connect_next: ran out of addresses to try") |
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166 |
|
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167 |
def run_client (host, port) : |
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168 |
""" |
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169 |
Execute in client-mode |
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170 |
""" |
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171 |
|
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172 |
# figure out AF to use |
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173 |
if options.ipv4 : |
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174 |
family = AF_INET |
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175 |
|
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176 |
elif options.ipv6 : |
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177 |
family = AF_INET6 |
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178 |
|
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179 |
else : |
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180 |
family = AF_UNSPEC |
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181 |
|
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182 |
# fixed socktype |
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183 |
socktype = SOCK_STREAM |
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184 |
|
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185 |
# look up the address and start a non-blocking connect |
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186 |
sock_iter = sock_connect(host, port, family, socktype) |
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187 |
|
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188 |
# start waiting |
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189 |
client_connect_next(sock_iter) |
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190 |
|
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191 |
def main (argv) : |
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192 |
# parse args |
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193 |
args = parse_argv(argv) |
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194 |
|
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195 |
# XXX: support listen mode |
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196 |
host, port = args |
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197 |
|
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198 |
run_client(host, port) |
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199 |
|
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200 |
# run mainloop |
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201 |
log_debug("main: entering event loop") |
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202 |
|
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203 |
if ev_base.loop() : |
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204 |
log_debug("main: event loop done") |
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205 |
|
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206 |
else : |
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207 |
log_err("main: event loop was idle!") |
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208 |
|
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209 |
if __name__ == '__main__' : |
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210 |
main(sys.argv) |
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211 |