def main():
if helpers.verbose >= 1:
helpers.logprefix = ' s: '
else:
helpers.logprefix = 'server: '
assert latency_control is not None
debug1('latency control setting = %r\n' % latency_control)
routes = list(list_routes())
debug1('available routes:\n')
for r in routes:
debug1(' %d/%s/%d\n' % r)
# synchronization header
sys.stdout.write('\0\0SSHUTTLE0001')
sys.stdout.flush()
handlers = []
mux = Mux(
socket.fromfd(sys.stdin.fileno(), socket.AF_INET, socket.SOCK_STREAM),
socket.fromfd(sys.stdout.fileno(), socket.AF_INET, socket.SOCK_STREAM))
handlers.append(mux)
routepkt = ''
for r in routes:
routepkt += '%d,%s,%d\n' % r
mux.send(0, ssnet.CMD_ROUTES, routepkt)
hw = Hostwatch()
hw.leftover = ''
def hostwatch_ready():
assert (hw.pid)
content = hw.sock.recv(4096)
if content:
lines = (hw.leftover + content).split('\n')
if lines[-1]:
# no terminating newline: entry isn't complete yet!
hw.leftover = lines.pop()
lines.append('')
else:
hw.leftover = ''
mux.send(0, ssnet.CMD_HOST_LIST, '\n'.join(lines))
else:
raise Fatal('hostwatch process died')
def got_host_req(data):
if not hw.pid:
(hw.pid, hw.sock) = start_hostwatch(data.strip().split())
handlers.append(Handler(socks=[hw.sock], callback=hostwatch_ready))
mux.got_host_req = got_host_req
def new_channel(channel, data):
(family, dstip, dstport) = data.split(',', 2)
family = int(family)
dstport = int(dstport)
outwrap = ssnet.connect_dst(family, dstip, dstport)
handlers.append(Proxy(MuxWrapper(mux, channel), outwrap))
mux.new_channel = new_channel
dnshandlers = {}
def dns_req(channel, data):
debug2('Incoming DNS request channel=%d.\n' % channel)
h = DnsProxy(mux, channel, data)
handlers.append(h)
dnshandlers[channel] = h
mux.got_dns_req = dns_req
udphandlers = {}
def udp_req(channel, cmd, data):
debug2('Incoming UDP request channel=%d, cmd=%d\n' % (channel, cmd))
if cmd == ssnet.CMD_UDP_DATA:
(dstip, dstport, data) = data.split(",", 2)
dstport = int(dstport)
debug2('is incoming UDP data. %r %d.\n' % (dstip, dstport))
h = udphandlers[channel]
h.send((dstip, dstport), data)
elif cmd == ssnet.CMD_UDP_CLOSE:
debug2('is incoming UDP close\n')
h = udphandlers[channel]
h.ok = False
del mux.channels[channel]
def udp_open(channel, data):
debug2('Incoming UDP open.\n')
family = int(data)
mux.channels[channel] = lambda cmd, data: udp_req(channel, cmd, data)
if channel in udphandlers:
raise Fatal('UDP connection channel %d already open' % channel)
else:
h = UdpProxy(mux, channel, family)
handlers.append(h)
udphandlers[channel] = h
mux.got_udp_open = udp_open
while mux.ok:
if hw.pid:
assert (hw.pid > 0)
(rpid, rv) = os.waitpid(hw.pid, os.WNOHANG)
if rpid:
raise Fatal('hostwatch exited unexpectedly: code 0x%04x\n' %
rv)
ssnet.runonce(handlers, mux)
if latency_control:
mux.check_fullness()
mux.callback()
if dnshandlers:
now = time.time()
for channel, h in dnshandlers.items():
if h.timeout < now or not h.ok:
debug3('expiring dnsreqs channel=%d\n' % channel)
del dnshandlers[channel]
h.ok = False
if udphandlers:
for channel, h in udphandlers.items():
if not h.ok:
debug3('expiring UDP channel=%d\n' % channel)
del udphandlers[channel]
h.ok = False
helpers.logprefix = 'client: '
debug1('connecting to server...\n')
try:
(serverproc, serversock) = ssh.connect(
ssh_cmd,
remotename,
python,
stderr=ssyslog._p and ssyslog._p.stdin,
options=dict(latency_control=latency_control, method=method))
except socket.error, e:
if e.args[0] == errno.EPIPE:
raise Fatal("failed to establish ssh session (1)")
else:
raise
mux = Mux(serversock, serversock)
handlers.append(mux)
expected = 'SSHUTTLE0001'
try:
v = 'x'
while v and v != '\0':
v = serversock.recv(1)
v = 'x'
while v and v != '\0':
v = serversock.recv(1)
initstring = serversock.recv(len(expected))
except socket.error, e:
if e.args[0] == errno.ECONNRESET:
raise Fatal("failed to establish ssh session (2)")
def main():
if helpers.verbose >= 1:
helpers.logprefix = ' s: '
else:
helpers.logprefix = 'server: '
debug1('latency control setting = %r\n' % latency_control)
routes = list(list_routes())
debug1('available routes:\n')
for r in routes:
debug1(' %s/%d\n' % r)
# synchronization header
sys.stdout.write('SSHUTTLE0001')
sys.stdout.flush()
handlers = []
mux = Mux(
socket.fromfd(sys.stdin.fileno(), socket.AF_INET, socket.SOCK_STREAM),
socket.fromfd(sys.stdout.fileno(), socket.AF_INET, socket.SOCK_STREAM))
handlers.append(mux)
routepkt = ''
for r in routes:
routepkt += '%s,%d\n' % r
mux.send(0, ssnet.CMD_ROUTES, routepkt)
hw = Hostwatch()
hw.leftover = ''
def hostwatch_ready():
assert (hw.pid)
content = hw.sock.recv(4096)
if content:
lines = (hw.leftover + content).split('\n')
if lines[-1]:
# no terminating newline: entry isn't complete yet!
hw.leftover = lines.pop()
lines.append('')
else:
hw.leftover = ''
mux.send(0, ssnet.CMD_HOST_LIST, '\n'.join(lines))
else:
raise Fatal('hostwatch process died')
def got_host_req(data):
if not hw.pid:
(hw.pid, hw.sock) = start_hostwatch(data.strip().split())
handlers.append(Handler(socks=[hw.sock], callback=hostwatch_ready))
mux.got_host_req = got_host_req
def new_channel(channel, data):
(dstip, dstport) = data.split(',', 1)
dstport = int(dstport)
outwrap = ssnet.connect_dst(dstip, dstport)
handlers.append(Proxy(MuxWrapper(mux, channel), outwrap))
mux.new_channel = new_channel
dnshandlers = {}
def dns_req(channel, data):
debug2('Incoming DNS request.\n')
h = DnsProxy(mux, channel, data)
handlers.append(h)
dnshandlers[channel] = h
mux.got_dns_req = dns_req
while mux.ok:
if hw.pid:
assert (hw.pid > 0)
(rpid, rv) = os.waitpid(hw.pid, os.WNOHANG)
if rpid:
raise Fatal('hostwatch exited unexpectedly: code 0x%04x\n' %
rv)
ssnet.runonce(handlers, mux)
if latency_control:
mux.check_fullness()
mux.callback()
if dnshandlers:
now = time.time()
for channel, h in dnshandlers.items():
if h.timeout < now or not h.ok:
del dnshandlers[channel]
h.ok = False
