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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
def get_example_trace(fn):
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
print "fullfn = {0}\n" . format(full_fn)
t = plt.trace(full_fn)
t.start()
return t
def print_data(msg, offset, data, mxlen):
blanks = ' ' * (offset-1) # print outputs an extra blank
pad = ' ' * (offset - len(msg) + 1) # Don't change (caller's) msg!
print "%s%s" % (msg, pad), # 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" % (blanks),
if j % 8 == 0 and j != 0:
print ' ',
print "%02x" % (data[j]),
print
def print_ip(ip, offset):
margin = ' ' * offset
print "%s -> %s, proto=%d, tclass=%x," % (
ip.src_prefix, ip.dst_prefix, ip.proto, ip.traffic_class)
print "%sttl=%d, hlen=%d, plen=%d, " % (
margin, ip.ttl, ip.hdr_len, ip.pkt_len),
print "mf=%s, frag_offset=%d, ident=%04x" % (
ip.has_mf, ip.frag_offset, ip.ident)
def print_ip6(ip6, offset):
margin = ' ' * offset
print "%s -> %s, proto=%d, tclass=%x," % (
ip6.src_prefix, ip6.dst_prefix, ip6.proto, ip6.traffic_class)
print "%sttl=%d, hlen=%s, plen=%s" % (
margin, ip6.hop_limit, ip6.hdr_len, ip6.pkt_len),
print "flow_label=%x, payload_len=%d, next_hdr=%d" % (
ip6.flow_label, ip6.payload_len, ip6.next_hdr)
def print_tcp(tcp, margin):
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 "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 " 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 ", no payload"
else:
pd = payload.data
print_data("\n payload ", margin, pd, 64)
def print_udp(udp, margin):
print "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): # Print info for encapsulated IP pkt
print "proto=%d, TTL=%d, pkt_len=%d" % (
p.proto, p.ttl, p.pkt_len)
def print_icmp(icmp, offset): # IPv4 only (IPv6 uses ICMP6 protocol)
margin = ' ' * offset
print "%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 "%sEcho %s ident=%04x, sequence=%d" % (
margin, which, echo.ident, echo.sequence)
pt = 'Echo'
elif type == 3: # Destination Unreachable
print "%sDestination unreachable," % (margin),
print_icmp_ip(p, margin); pd = p.data
elif type == 4: # Source Quench
print "%sSource quench," % (margin),
print_icmp_ip(p, margin); pd = p.data
elif type == 5: # Redirect
redirect = icmp.redirect;
print "%sRedirect, gateway=%s," % (margin, redirect.gateway),
print_icmp_ip(p, margin); pd = p.data
elif type == 11: # Time Exceeded
print "%sTime exceeded," % (margin),
print_icmp_ip(p, margin); pd = p.data
elif type == 12: # Parameter problem
print "%sParameter Probl\em," % (margin),
print_icmp_ip(p, margin); pd = p.data
else:
pt = 'Other'
t = margin + pt
print_data(t, offset+len(pt), pd, 64)
def print_ip6_info(ip6):
print "%s -> %s, TTL=%d" % (
ip6.src_prefix, ip6.dst_prefix, ip6.ttl)
def print_icmp6(icmp6, offset): # IPv6 only
margin = ' ' * (offset-3)
print "%sICMP6: type=%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 "%sDestination unreachable:" % (margin),
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 "%sEcho %s ident=%04x, sequence=%d" % (
margin, which, echo.ident, echo.sequence)
pt = 'Data'
elif type == 2: # Packet Too Big
print "%sPacket Too Big; MTU=%d:" % (margin, icmp6.toobig.mtu),
pt = 'IP '
print_ip6_info(p); pd = p.data
elif type == 3: # Time Exceeded
print "%sTime Exceeded:" % (margin),
pt = 'IP6 '
print_ip6_info(p); pd = p.data
elif type == 4: # Parameter Problem
print "%sParameter Problem; pointer=%d," % (margin, icmp6.param.pointer),
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 "%s%s: target_prefix=%s, src_prefix=%s" % (
margin, s, icmp6.neighbour.target_prefix, icmp6.src_prefix)
else:
print "%s%s: src_prefix=%s" % (margin, s, icmp6.src_prefix)
pt = 'Data'
t = margin + pt
print_data(t, offset+3, pd, 64)
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