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#!/usr/bin/env python3
'''
Usage: frr_babeltrace.py trace_path
FRR pushes data into lttng tracepoints in the least overhead way possible
i.e. as binary-data/crf_arrays. These traces need to be converted into pretty
strings for easy greping etc. This script is a babeltrace python plugin for
that pretty printing.
Copyright (C) 2021 NVIDIA Corporation
Anuradha Karuppiah
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along
with this program; see the file COPYING; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
'''
import ipaddress
import socket
import sys
import babeltrace
########################### common parsers - start ############################
def print_ip_addr(field_val):
'''
pretty print "struct ipaddr"
'''
if field_val[0] == socket.AF_INET:
addr = [str(fv) for fv in field_val[4:8]]
return str(ipaddress.IPv4Address('.'.join(addr)))
if field_val[0] == socket.AF_INET6:
tmp = ''.join('%02x' % fb for fb in field_val[4:])
addr = []
while tmp:
addr.append(tmp[:4])
tmp = tmp[4:]
addr = ':'.join(addr)
return str(ipaddress.IPv6Address(addr))
if not field_val[0]:
return ''
return field_val
def print_mac(field_val):
'''
pretty print "u8 mac[6]"
'''
return ':'.join('%02x' % fb for fb in field_val)
def print_net_ipv4_addr(field_val):
'''
pretty print ctf_integer_network ipv4
'''
return str(ipaddress.IPv4Address(field_val))
def print_esi(field_val):
'''
pretty print ethernet segment id, esi_t
'''
return ':'.join('%02x' % fb for fb in field_val)
def get_field_list(event):
'''
only fetch fields added via the TP, skip metadata etc.
'''
return event.field_list_with_scope(babeltrace.CTFScope.EVENT_FIELDS)
def parse_event(event, field_parsers):
'''
Wild card event parser; doesn't make things any prettier
'''
field_list = get_field_list(event)
field_info = {}
for field in field_list:
if field in field_parsers:
field_parser = field_parsers.get(field)
field_info[field] = field_parser(event.get(field))
else:
field_info[field] = event.get(field)
print(event.name, field_info)
############################ common parsers - end #############################
############################ evpn parsers - start #############################
def parse_frr_bgp_evpn_mac_ip_zsend(event):
'''
bgp evpn mac-ip parser; raw format -
ctf_array(unsigned char, mac, &pfx->prefix.macip_addr.mac,
sizeof(struct ethaddr))
ctf_array(unsigned char, ip, &pfx->prefix.macip_addr.ip,
sizeof(struct ipaddr))
ctf_integer_network_hex(unsigned int, vtep, vtep.s_addr)
ctf_array(unsigned char, esi, esi, sizeof(esi_t))
'''
field_parsers = {'ip': print_ip_addr,
'mac': print_mac,
'esi': print_esi,
'vtep': print_net_ipv4_addr}
parse_event(event, field_parsers)
def parse_frr_bgp_evpn_bum_vtep_zsend(event):
'''
bgp evpn bum-vtep parser; raw format -
ctf_integer_network_hex(unsigned int, vtep,
pfx->prefix.imet_addr.ip.ipaddr_v4.s_addr)
'''
field_parsers = {'vtep': print_net_ipv4_addr}
parse_event(event, field_parsers)
def parse_frr_bgp_evpn_mh_nh_rmac_send(event):
'''
bgp evpn nh-rmac parser; raw format -
ctf_array(unsigned char, rmac, &nh->rmac, sizeof(struct ethaddr))
'''
field_parsers = {'rmac': print_mac}
parse_event(event, field_parsers)
############################ evpn parsers - end #############################
def main():
'''
FRR lttng trace output parser; babel trace plugin
'''
event_parsers = {'frr_bgp:evpn_mac_ip_zsend':
parse_frr_bgp_evpn_mac_ip_zsend,
'frr_bgp:evpn_bum_vtep_zsend':
parse_frr_bgp_evpn_bum_vtep_zsend,
'frr_bgp:evpn_mh_nh_rmac_zsend':
parse_frr_bgp_evpn_mh_nh_rmac_send}
# get the trace path from the first command line argument
trace_path = sys.argv[1]
# grab events
trace_collection = babeltrace.TraceCollection()
trace_collection.add_traces_recursive(trace_path, 'ctf')
for event in trace_collection.events:
if event.name in event_parsers:
event_parser = event_parsers.get(event.name)
event_parser(event)
else:
parse_event(event, {})
if __name__ == '__main__':
main()
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