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mosq_test.py
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mosq_test.py
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import errno
import os
import socket
import subprocess
import struct
import time
def start_broker(filename, cmd=None, port=1888):
delay = 0.1
if cmd is None:
cmd = ['../../src/mosquitto', '-v', '-c', filename.replace('.py', '.conf')]
if os.environ.get('MOSQ_USE_VALGRIND') is not None:
cmd = ['valgrind', '-q', '--log-file='+filename+'.vglog'] + cmd
delay = 1
broker = subprocess.Popen(cmd, stderr=subprocess.PIPE)
for i in range(0, 20):
time.sleep(delay)
c = None
try:
c = socket.create_connection(("localhost", port))
except socket.error as err:
if err.errno != errno.ECONNREFUSED:
raise
if c is not None:
c.close()
time.sleep(delay)
return broker
raise IOError
def start_client(filename, cmd, env):
if cmd is None:
raise ValueError
if os.environ.get('MOSQ_USE_VALGRIND') is not None:
cmd = ['valgrind', '-q', '--log-file='+filename+'.vglog'] + cmd
return subprocess.Popen(cmd, env=env)
def expect_packet(sock, name, expected):
if len(expected) > 0:
rlen = len(expected)
else:
rlen = 1
packet_recvd = sock.recv(rlen)
return packet_matches(name, packet_recvd, expected)
def packet_matches(name, recvd, expected):
if recvd != expected:
print("FAIL: Received incorrect "+name+".")
try:
print("Received: "+to_string(recvd))
except struct.error:
print("Received (not decoded): "+recvd)
try:
print("Expected: "+to_string(expected))
except struct.error:
print("Expected (not decoded): "+expected)
return 0
else:
return 1
def do_client_connect(connect_packet, connack_packet, hostname="localhost", port=1888, timeout=60, connack_error="connack"):
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(timeout)
sock.connect((hostname, port))
sock.send(connect_packet)
if expect_packet(sock, connack_error, connack_packet):
return sock
else:
sock.close()
raise ValueError
def remaining_length(packet):
l = min(5, len(packet))
all_bytes = struct.unpack("!"+"B"*l, packet[:l])
mult = 1
rl = 0
for i in range(1,l-1):
byte = all_bytes[i]
rl += (byte & 127) * mult
mult *= 128
if byte & 128 == 0:
packet = packet[i+1:]
break
return (packet, rl)
def to_string(packet):
if len(packet) == 0:
return ""
packet0 = struct.unpack("!B", packet[0])
packet0 = packet0[0]
cmd = packet0 & 0xF0
if cmd == 0x00:
# Reserved
return "0x00"
elif cmd == 0x10:
# CONNECT
(packet, rl) = remaining_length(packet)
pack_format = "!H" + str(len(packet)-2) + 's'
(slen, packet) = struct.unpack(pack_format, packet)
pack_format = "!" + str(slen)+'sBBH' + str(len(packet)-slen-4) + 's'
(protocol, proto_ver, flags, keepalive, packet) = struct.unpack(pack_format, packet)
s = "CONNECT, proto="+protocol+str(proto_ver)+", keepalive="+str(keepalive)
if flags&2:
s = s+", clean-session"
else:
s = s+", durable"
pack_format = "!H" + str(len(packet)-2) + 's'
(slen, packet) = struct.unpack(pack_format, packet)
pack_format = "!" + str(slen)+'s' + str(len(packet)-slen) + 's'
(client_id, packet) = struct.unpack(pack_format, packet)
s = s+", id="+client_id
if flags&4:
pack_format = "!H" + str(len(packet)-2) + 's'
(slen, packet) = struct.unpack(pack_format, packet)
pack_format = "!" + str(slen)+'s' + str(len(packet)-slen) + 's'
(will_topic, packet) = struct.unpack(pack_format, packet)
s = s+", will-topic="+will_topic
pack_format = "!H" + str(len(packet)-2) + 's'
(slen, packet) = struct.unpack(pack_format, packet)
pack_format = "!" + str(slen)+'s' + str(len(packet)-slen) + 's'
(will_message, packet) = struct.unpack(pack_format, packet)
s = s+", will-message="+will_message
s = s+", will-qos="+str((flags&24)>>3)
s = s+", will-retain="+str((flags&32)>>5)
if flags&128:
pack_format = "!H" + str(len(packet)-2) + 's'
(slen, packet) = struct.unpack(pack_format, packet)
pack_format = "!" + str(slen)+'s' + str(len(packet)-slen) + 's'
(username, packet) = struct.unpack(pack_format, packet)
s = s+", username="+username
if flags&64:
pack_format = "!H" + str(len(packet)-2) + 's'
(slen, packet) = struct.unpack(pack_format, packet)
pack_format = "!" + str(slen)+'s' + str(len(packet)-slen) + 's'
(password, packet) = struct.unpack(pack_format, packet)
s = s+", password="+password
return s
elif cmd == 0x20:
# CONNACK
(cmd, rl, resv, rc) = struct.unpack('!BBBB', packet)
return "CONNACK, rl="+str(rl)+", res="+str(resv)+", rc="+str(rc)
elif cmd == 0x30:
# PUBLISH
dup = (packet0 & 0x08)>>3
qos = (packet0 & 0x06)>>1
retain = (packet0 & 0x01)
(packet, rl) = remaining_length(packet)
pack_format = "!H" + str(len(packet)-2) + 's'
(tlen, packet) = struct.unpack(pack_format, packet)
pack_format = "!" + str(tlen)+'s' + str(len(packet)-tlen) + 's'
(topic, packet) = struct.unpack(pack_format, packet)
s = "PUBLISH, rl="+str(rl)+", topic="+topic+", qos="+str(qos)+", retain="+str(retain)+", dup="+str(dup)
if qos > 0:
pack_format = "!H" + str(len(packet)-2) + 's'
(mid, packet) = struct.unpack(pack_format, packet)
s = s + ", mid="+str(mid)
s = s + ", payload="+packet
return s
elif cmd == 0x40:
# PUBACK
(cmd, rl, mid) = struct.unpack('!BBH', packet)
return "PUBACK, rl="+str(rl)+", mid="+str(mid)
elif cmd == 0x50:
# PUBREC
(cmd, rl, mid) = struct.unpack('!BBH', packet)
return "PUBREC, rl="+str(rl)+", mid="+str(mid)
elif cmd == 0x60:
# PUBREL
dup = (packet0 & 0x08)>>3
(cmd, rl, mid) = struct.unpack('!BBH', packet)
return "PUBREL, rl="+str(rl)+", mid="+str(mid)+", dup="+str(dup)
elif cmd == 0x70:
# PUBCOMP
(cmd, rl, mid) = struct.unpack('!BBH', packet)
return "PUBCOMP, rl="+str(rl)+", mid="+str(mid)
elif cmd == 0x80:
# SUBSCRIBE
(packet, rl) = remaining_length(packet)
pack_format = "!H" + str(len(packet)-2) + 's'
(mid, packet) = struct.unpack(pack_format, packet)
s = "SUBSCRIBE, rl="+str(rl)+", mid="+str(mid)
topic_index = 0
while len(packet) > 0:
pack_format = "!H" + str(len(packet)-2) + 's'
(tlen, packet) = struct.unpack(pack_format, packet)
pack_format = "!" + str(tlen)+'sB' + str(len(packet)-tlen-1) + 's'
(topic, qos, packet) = struct.unpack(pack_format, packet)
s = s + ", topic"+str(topic_index)+"="+topic+","+str(qos)
return s
elif cmd == 0x90:
# SUBACK
(packet, rl) = remaining_length(packet)
pack_format = "!H" + str(len(packet)-2) + 's'
(mid, packet) = struct.unpack(pack_format, packet)
pack_format = "!" + "B"*len(packet)
granted_qos = struct.unpack(pack_format, packet)
s = "SUBACK, rl="+str(rl)+", mid="+str(mid)+", granted_qos="+str(granted_qos[0])
for i in range(1, len(granted_qos)-1):
s = s+", "+str(granted_qos[i])
return s
elif cmd == 0xA0:
# UNSUBSCRIBE
(packet, rl) = remaining_length(packet)
pack_format = "!H" + str(len(packet)-2) + 's'
(mid, packet) = struct.unpack(pack_format, packet)
s = "UNSUBSCRIBE, rl="+str(rl)+", mid="+str(mid)
topic_index = 0
while len(packet) > 0:
pack_format = "!H" + str(len(packet)-2) + 's'
(tlen, packet) = struct.unpack(pack_format, packet)
pack_format = "!" + str(tlen)+'s' + str(len(packet)-tlen) + 's'
(topic, packet) = struct.unpack(pack_format, packet)
s = s + ", topic"+str(topic_index)+"="+topic
return s
elif cmd == 0xB0:
# UNSUBACK
(cmd, rl, mid) = struct.unpack('!BBH', packet)
return "UNSUBACK, rl="+str(rl)+", mid="+str(mid)
elif cmd == 0xC0:
# PINGREQ
(cmd, rl) = struct.unpack('!BB', packet)
return "PINGREQ, rl="+str(rl)
elif cmd == 0xD0:
# PINGRESP
(cmd, rl) = struct.unpack('!BB', packet)
return "PINGRESP, rl="+str(rl)
elif cmd == 0xE0:
# DISCONNECT
(cmd, rl) = struct.unpack('!BB', packet)
return "DISCONNECT, rl="+str(rl)
elif cmd == 0xF0:
# Reserved
return "0xF0"
def gen_connect(client_id, clean_session=True, keepalive=60, username=None, password=None, will_topic=None, will_qos=0, will_retain=False, will_payload="", proto_ver=3):
if (proto_ver&0x7F) == 3 or proto_ver == 0:
remaining_length = 12
elif (proto_ver&0x7F) == 4:
remaining_length = 10
else:
raise ValueError
if client_id != None:
remaining_length = remaining_length + 2+len(client_id)
connect_flags = 0
if clean_session:
connect_flags = connect_flags | 0x02
if will_topic != None:
remaining_length = remaining_length + 2+len(will_topic) + 2+len(will_payload)
connect_flags = connect_flags | 0x04 | ((will_qos&0x03) << 3)
if will_retain:
connect_flags = connect_flags | 32
if username != None:
remaining_length = remaining_length + 2+len(username)
connect_flags = connect_flags | 0x80
if password != None:
connect_flags = connect_flags | 0x40
remaining_length = remaining_length + 2+len(password)
rl = pack_remaining_length(remaining_length)
packet = struct.pack("!B"+str(len(rl))+"s", 0x10, rl)
if (proto_ver&0x7F) == 3 or proto_ver == 0:
packet = packet + struct.pack("!H6sBBH", len("MQIsdp"), "MQIsdp", proto_ver, connect_flags, keepalive)
elif (proto_ver&0x7F) == 4:
packet = packet + struct.pack("!H4sBBH", len("MQTT"), "MQTT", proto_ver, connect_flags, keepalive)
if client_id != None:
packet = packet + struct.pack("!H"+str(len(client_id))+"s", len(client_id), client_id)
if will_topic != None:
packet = packet + struct.pack("!H"+str(len(will_topic))+"s", len(will_topic), will_topic)
if len(will_payload) > 0:
packet = packet + struct.pack("!H"+str(len(will_payload))+"s", len(will_payload), will_payload)
else:
packet = packet + struct.pack("!H", 0)
if username != None:
packet = packet + struct.pack("!H"+str(len(username))+"s", len(username), username)
if password != None:
packet = packet + struct.pack("!H"+str(len(password))+"s", len(password), password)
return packet
def gen_connack(resv=0, rc=0):
return struct.pack('!BBBB', 32, 2, resv, rc);
def gen_publish(topic, qos, payload=None, retain=False, dup=False, mid=0):
rl = 2+len(topic)
pack_format = "!BBH"+str(len(topic))+"s"
if qos > 0:
rl = rl + 2
pack_format = pack_format + "H"
if payload != None:
rl = rl + len(payload)
pack_format = pack_format + str(len(payload))+"s"
else:
payload = ""
pack_format = pack_format + "0s"
cmd = 48 | (qos<<1)
if retain:
cmd = cmd + 1
if dup:
cmd = cmd + 8
if qos > 0:
return struct.pack(pack_format, cmd, rl, len(topic), topic, mid, payload)
else:
return struct.pack(pack_format, cmd, rl, len(topic), topic, payload)
def gen_puback(mid):
return struct.pack('!BBH', 64, 2, mid)
def gen_pubrec(mid):
return struct.pack('!BBH', 80, 2, mid)
def gen_pubrel(mid, dup=False):
if dup:
cmd = 96+8+2
else:
cmd = 96+2
return struct.pack('!BBH', cmd, 2, mid)
def gen_pubcomp(mid):
return struct.pack('!BBH', 112, 2, mid)
def gen_subscribe(mid, topic, qos):
pack_format = "!BBHH"+str(len(topic))+"sB"
return struct.pack(pack_format, 130, 2+2+len(topic)+1, mid, len(topic), topic, qos)
def gen_suback(mid, qos):
return struct.pack('!BBHB', 144, 2+1, mid, qos)
def gen_unsubscribe(mid, topic):
pack_format = "!BBHH"+str(len(topic))+"s"
return struct.pack(pack_format, 162, 2+2+len(topic), mid, len(topic), topic)
def gen_unsuback(mid):
return struct.pack('!BBH', 176, 2, mid)
def gen_pingreq():
return struct.pack('!BB', 192, 0)
def gen_pingresp():
return struct.pack('!BB', 208, 0)
def gen_disconnect():
return struct.pack('!BB', 224, 0)
def pack_remaining_length(remaining_length):
s = ""
while True:
byte = remaining_length % 128
remaining_length = remaining_length // 128
# If there are more digits to encode, set the top bit of this digit
if remaining_length > 0:
byte = byte | 0x80
s = s + struct.pack("!B", byte)
if remaining_length == 0:
return s