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# Thu, 13 Mar 14 (PDT)
# plt-testing.py: Support routines for testing python-libtrace
# Copyright (C) 2015, Nevil Brownlee, U Auckland | WAND
import plt # Also imports ipp and datetime
import os # Contains getcwd
import sys # exit and stdout
import re # regular expressions
# import socket # gethostname
import inspect
def get_example_trace(fn, show_full_fn=False):
cwd = os.getcwd()
basename = os.path.basename(cwd)
if re.match(r'python-libtrace', basename):
full_fn = 'pcapfile:' + cwd + '/doc/examples/' + fn
else:
full_fn = 'pcapfile:' + cwd + '/' + fn
if show_full_fn:
print(get_tag()+"fullfn = {0}\n" . format(full_fn))
else:
print(get_tag()+"fn = {0}\n" . format(fn))
t = plt.trace(full_fn)
t.start()
return t
def print_data(msg, offset, data, mxlen, tag=''):
blanks = ' ' * (offset-1) # print outputs an extra blank
pad = ' ' * (offset - len(msg) + 1) # Don't change (caller's) msg!
print(tag+get_tag()+" %s%s" % (msg, pad), end='') # Trailing comma suppresses the linefeed
for j in range(len(data)):
if j == mxlen:
break
if j % 32 == 0 and j != 0:
print("\n%s%s" % (tag+get_tag(),blanks), end='')
if j % 8 == 0 and j != 0:
print(' ', end='')
print(" %02x" % (data[j]), end='')
print()
def print_ip(ip, offset, tag=''):
margin = ' ' * offset
print(tag+get_tag()+" %s -> %s, proto=%d, tclass=%x," % (
ip.src_prefix, ip.dst_prefix, ip.proto, ip.traffic_class))
print(tag+get_tag()+" %sttl=%d, hlen=%d, plen=%d, " % (
margin, ip.ttl, ip.hdr_len, ip.pkt_len), end='')
print(" mf=%s, frag_offset=%d, ident=%04x" % (
ip.has_mf, ip.frag_offset, ip.ident))
def print_ip6(ip6, offset, tag=''):
margin = ' ' * offset
print(tag+get_tag()+" %s -> %s, proto=%d, tclass=%x," % (
ip6.src_prefix, ip6.dst_prefix, ip6.proto, ip6.traffic_class))
print(tag+get_tag()+" %sttl=%d, hlen=%s, plen=%s" % (
margin, ip6.hop_limit, ip6.hdr_len, ip6.pkt_len), end='')
print(" flow_label=%x, payload_len=%d, next_hdr=%d" % (
ip6.flow_label, ip6.payload_len, ip6.next_hdr))
def print_tcp(tcp, margin, tag=''):
fl = ''
if tcp.urg_flag:
fl += 'U'
if tcp.psh_flag:
fl += 'P'
if tcp.rst_flag:
fl += 'R'
if tcp.fin_flag:
fl += 'F'
if tcp.syn_flag:
fl += 'S'
if tcp.ack_flag:
fl += 'A'
print(tag+get_tag()+" TCP, %s -> %s, %d -> %d, seq=%u, ack=%u" % (
tcp.src_prefix, tcp.dst_prefix, tcp.src_port, tcp.dst_port,
tcp.seq_nbr, tcp.ack_nbr))
print(tag+get_tag()+" flags=%02x (%s), window=%u, checksum=%x, urg_ptr=%u" % (
tcp.flags, fl, tcp.window, tcp.checksum, tcp.urg_ptr))
payload = tcp.payload
if not payload:
print(tag+get_tag()+" "+"no payload")
else:
pd = payload.data
print_data("\n"+tag+get_tag()+" payload:", margin, pd, 64, tag+get_tag())
def print_udp(udp, margin, tag=''):
print(tag+get_tag()+" UDP, src_port=%u, dest_port=%u, len=%u, checksum=%04x" % (
udp.src_port, udp.dst_port, udp.len, udp.checksum))
t = (' ' * 8) + 'UDP'
# print_data(t, margin, udp.data, 64)
def print_icmp_ip(p, margin, tag=''):
print(tag+get_tag()+" proto=%d, TTL=%d, pkt_len=%d" % (
p.proto, p.ttl, p.pkt_len))
def print_icmp(icmp, offset,
tag=''): # IPv4 only (IPv6 uses ICMP6 protocol)
margin = ' ' * offset
print(tag+get_tag()+"%sICMP, type=%u, code=%u, checksum=%04x, wlen=%d, clen=%d, %s" % (
margin, icmp.type, icmp.code, icmp.checksum,
icmp.wire_len, icmp.capture_len, icmp.time))
pd = p = icmp.payload
type = icmp.type; pt = 'IP '
if type == 0 or type == 8: # Echo Reply, Echo Request
if type == 8:
which = 'request,'
else:
which = 'reply, '
echo = icmp.echo
print(tag+get_tag()+"%sEcho %s ident=%04x, sequence=%d" % (
margin, which, echo.ident, echo.sequence))
pt = 'Echo'
elif type == 3: # Destination Unreachable
print(tag+get_tag()+"%sDestination unreachable, " % (margin), end='')
print_icmp_ip(p, margin); pd = p.data
elif type == 4: # Source Quench
print(tag+"%sSource quench, " % (margin), end='')
print_icmp_ip(p, margin); pd = p.data
elif type == 5: # Redirect
redirect = icmp.redirect
print(tag+"%sRedirect, gateway=%s, " % (margin, redirect.gateway), end='')
print_icmp_ip(p, margin); pd = p.data
elif type == 11: # Time Exceeded
print(tag+"%sTime exceeded, " % (margin), end='')
print_icmp_ip(p, margin); pd = p.data
else:
print(tag+get_tag()+" %sOther, ", end='')
t = margin + pt
print_data(t, offset+len(pt), pd, 64, tag+get_tag())
def print_ip6_info(ip6, tag=''):
print(tag+get_tag()+" %s -> %s, TTL=%d" % (
ip6.src_prefix, ip6.dst_prefix, ip6.ttl))
def print_icmp6(icmp6, offset, tag=''): # IPv6 only
margin = ' ' * (offset-3)
print(tag+get_tag()+"%sICMP6: stype=%u, code=%u, checksum=%04x, wlen=%d, clen=%d, %s" % (
margin, icmp6.type, icmp6.code, icmp6.checksum,
icmp6.wire_len, icmp6.capture_len, icmp6.time))
margin = ' ' * offset
type = icmp6.type; pd = p = icmp6.payload; pt = 'Echo'
if type == 1: # Destination Unreachable
print(tag+get_tag()+"%sDestination unreachable: " % (margin), end='')
pt = 'IP6 '
print_ip6_info(p); pd = p.data
elif type == 128 or type == 129: # Echo Request, Echo Reply
if type == 128:
which = 'request:'
else:
which = 'reply: '
echo = icmp6.echo
print(tag+"%sEcho %s ident=%04x, sequence=%d" % (
margin, which, echo.ident, echo.sequence))
pt = 'Data'
elif type == 2: # Packet Too Big
print(tag+get_tag()+"%sPacket Too Big; MTU=%d: " % (margin, icmp6.toobig.mtu), end='')
pt = 'IP '
print_ip6_info(p); pd = p.data
elif type == 3: # Time Exceeded
print(tag+get_tag()+"%sTime Exceeded: " % (margin), end='')
pt = 'IP6 '
print_ip6_info(p); pd = p.data
elif type == 4: # Parameter Problem
print(tag+get_tag()+"%sParameter Problem; pointer=%d, " % (margin, icmp6.param.pointer), end='')
pt = 'IP6 '
print_ip6_info(p); pd = p.data
else:
if type == 133:
s = "Router Solicitation"
elif type == 134:
s = "Router Advertisment"
elif type == 135:
s = "Neighbour Solicitation"
elif type == 136:
s = "Neighbour Advertisment"
elif type == 137:
s = "Redirect"
elif type ==138:
s = "Router Renumbering"
else:
s = "Other"
if type == 135 or type == 136:
print(tag+get_tag()+"%s%s: target_prefix=%s, src_prefix=%s " % (
margin, s, icmp6.neighbour.target_prefix, icmp6.src_prefix))
else:
print(tag+get_tag()+"%s%s: src_prefix=%s " % (margin, s, icmp6.src_prefix))
pt = 'Data'
t = margin + pt
print_data(t, offset+3, pd, 64, tag+get_tag())
def test_println(message, tag=''):
print(tag+' '+message)
def test_print(message, tag=''):
if tag=='':
print(message, end='')
else:
print(tag+' '+message, end='')
def get_tag(message=None):
(frame, filename, line_number,
function_name, lines, index) = inspect.getouterframes(inspect.currentframe())[1]
if message == None:
return '['+function_name+':'+str(line_number)+']'
else:
return '['+function_name+':'+str(line_number)+':'+'{'+message+'}'+']'
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