author | Tero Marttila <terom@fixme.fi> |
Sat, 26 Sep 2009 22:09:24 +0300 | |
changeset 55 | 99c4344a35ce |
parent 54 | e7c136812b0d |
child 58 | ecd89f9605ac |
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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# global event_base |
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ev_base = base.event_base() |
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# buffer size to use, 4k - perhaps slightly smaller |
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BUFSIZE = 4 * 1024 |
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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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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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def log_debug (msg, *args) : |
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if options.debug : |
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log_msg('---', msg, *args) |
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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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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) : |
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log_info("sock_connect: ai: %s", ai) |
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|
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# build socket |
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try : |
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# 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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102 |
except OSError, e : |
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103 |
if e.errno != errno.EINPROGRESS : |
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104 |
raise |
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105 |
|
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106 |
else : |
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107 |
# XXX: wut??? |
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log_warn("sock_connect: connect: didn't return EINPROGRESS") |
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109 |
|
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110 |
except OSError, e : |
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111 |
# fsck |
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log_warn("sock_connect: %s: %s", ai.addr, e) |
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113 |
|
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114 |
else : |
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115 |
# yay |
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yield sock |
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|
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118 |
|
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def client_connect_next (sock_iter) : |
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120 |
""" |
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Attempt to run the given connect operation, on the given iterable of sockets. |
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122 |
""" |
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123 |
|
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124 |
for sock in sock_iter : |
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125 |
# pend for writing |
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log_debug("client_connect_next: cb_event(%d, EV_WRITE, on_connect, %r)", sock.fd, sock) |
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ev = cb_event(ev_base, sock.fd, EV_WRITE, on_connect, sock, sock_iter) |
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128 |
|
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129 |
# wait specified timeout |
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log_debug("client_connect_next: %r: add(%s)", ev, options.timeout) |
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ev.add(options.timeout) |
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132 |
|
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133 |
# ok |
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134 |
break |
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|
135 |
|
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136 |
else : |
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137 |
# fail, ran out of addresses to try |
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138 |
log_err("client_connect_next: ran out of addresses to try") |
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139 |
|
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140 |
|
54 | 141 |
def on_connect (ev, events, sock, sock_iter) : |
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142 |
""" |
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143 |
Outbound connect EV_WRITE callback, i.e. connection failed or was established |
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144 |
""" |
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145 |
|
54 | 146 |
log_debug("on_connect: ev=%r, events=%#x", ev, events) |
147 |
||
148 |
# test for timeout |
|
149 |
if events & EV_TIMEOUT : |
|
150 |
log_warn("on_connect: connect failed, timeout") |
|
151 |
||
152 |
# keep trying |
|
153 |
return client_connect_next(sock_iter) |
|
154 |
||
155 |
||
156 |
# test for errno |
|
157 |
err = sock.getsockopt_int(SOL_SOCKET, SO_ERROR) |
|
158 |
||
159 |
if err : |
|
160 |
# fail |
|
161 |
log_warn("on_connect: connect failed, errno=%d", err) |
|
162 |
||
163 |
# keep trying |
|
164 |
return client_connect_next(sock_iter) |
|
165 |
||
166 |
||
167 |
# ok, connected |
|
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168 |
client_connected(sock) |
54 | 169 |
|
48
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170 |
|
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171 |
def client_connected (sock) : |
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172 |
""" |
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173 |
Connection established, start shovelling data |
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174 |
""" |
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175 |
|
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176 |
log_info("Client connected to %s (from %s)", sock.getpeername(), sock.getsockname()) |
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177 |
|
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178 |
# go! |
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179 |
start_sock(sock, sys.stdin.fileno(), sys.stdout.fileno()) |
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180 |
|
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181 |
|
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182 |
def start_sock (sock, fd_in, fd_out) : |
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183 |
""" |
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184 |
Start shipping data between sock and fin/fout. |
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185 |
""" |
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186 |
|
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187 |
# event for each |
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188 |
ev_in = cb_event(ev_base, fd_in, EV_READ, on_read_in, sock, fd_in) |
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189 |
ev_out = cb_event(ev_base, sock.fd, EV_READ, on_read_sock, sock, fd_out) |
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190 |
|
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191 |
ev_in.add() |
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192 |
ev_out.add() |
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193 |
|
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194 |
|
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195 |
def on_read_in (ev, events, sock, fd_in) : |
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196 |
""" |
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197 |
Data readable on ev.fd, ship to sock |
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198 |
""" |
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199 |
|
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200 |
# no timeouts yet |
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201 |
assert events & EV_READ |
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202 |
|
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203 |
# try and read |
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204 |
buf = os.read(fd_in, BUFSIZE) |
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205 |
|
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206 |
if buf : |
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207 |
# pass on |
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208 |
assert sock.write(buf) == len(buf) |
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209 |
|
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210 |
# keep going |
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211 |
ev.add() |
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212 |
|
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213 |
else : |
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214 |
# EOF |
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215 |
sock.shutdown(SHUT_WR) |
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216 |
|
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217 |
|
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218 |
def on_read_sock (ev, events, sock, fd_out) : |
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219 |
""" |
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220 |
Data readable on sock, ship to fd_out |
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221 |
""" |
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222 |
|
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223 |
# no timeouts yet |
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224 |
assert events & EV_READ |
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225 |
|
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226 |
# try and read |
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227 |
buf = sock.read(BUFSIZE) |
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228 |
|
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229 |
if buf : |
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230 |
# pass on |
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231 |
assert os.write(fd_out, buf) == len(buf) |
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232 |
|
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233 |
# keep going |
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234 |
ev.add() |
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235 |
|
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else : |
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# EOF |
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os.close(fd_out) |
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log_info("EOF from %s", sock.getpeername()) |
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def run_client (host, port) : |
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""" |
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Execute in client-mode |
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""" |
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# figure out AF to use |
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if options.ipv4 : |
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family = AF_INET |
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elif options.ipv6 : |
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family = AF_INET6 |
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else : |
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family = AF_UNSPEC |
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# fixed socktype |
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socktype = SOCK_STREAM |
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# look up the address and start a non-blocking connect |
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sock_iter = sock_connect(host, port, family, socktype) |
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# start waiting |
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client_connect_next(sock_iter) |
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def main (argv) : |
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# parse args |
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args = parse_argv(argv) |
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# XXX: support listen mode |
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host, port = args |
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run_client(host, port) |
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# run mainloop |
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log_debug("main: entering event loop") |
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if ev_base.loop() : |
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log_debug("main: event loop done") |
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else : |
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log_err("main: event loop was idle!") |
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if __name__ == '__main__' : |
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main(sys.argv) |
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