Re: [dts] [PATCH v5 01/22] framework/packet: support packet sniffer to specify running machine

["Phil Yang (Arm Technology China)" <Phil.Yang@arm.com>]

Hi,

Any comments for those patches?

Thanks,
Phil Yang

> -----Original Message-----
> From: Phil Yang <phil.yang@arm.com>
> Sent: Tuesday, September 4, 2018 4:26 PM
> To: dts@dpdk.org
> Cc: nd <nd@arm.com>; yong.liu@intel.com; Phil Yang (Arm Technology China)
> <Phil.Yang@arm.com>
> Subject: [PATCH v5 01/22] framework/packet: support packet sniffer to specify
> running machine
> 
> From: Phil Yang <phil.yang@arm.com>
> 
> By default, the Tester is supposed to be the server which running DTS and the
> packet sniff methods are running on it.
> However, if DTS was not running on the Tester and the Tester is another remote
> server, so packet sniff methods cannot sniff Tester's packets correctly.
> 
> This patch adds support for packet sniff methods to specify running machine and
> implements sniff packet methods in class tester.
> 
> 1. Add parameter to sniff_packet and load_sniff_pcap methods to specify the
> running machine.
> 2. Remove load_sniff_packets method in packet.py.
> 3. Add tcpdump_sniff_packets, load_tcpdump_sniff_pcap and
> load_tcpdump_sniff_packets for class tester with the new sniff_packet API.
> 4. Update tester.check_random_pkts method with
> tester.tcpdump_sniff_packets and tester.load_tcpdump_sniff_packets to make
> it execution on the Tester.
> 
> Signed-off-by: Phil Yang <phil.yang@arm.com>
> Suggested-by: Marvin Liu <yong.liu@intel.com>
> ---
>  framework/packet.py | 86 +++++++++++++++++++++++++---------------------------
> -
>  framework/tester.py | 48 +++++++++++++++++++++++++++---
>  2 files changed, 84 insertions(+), 50 deletions(-)
> 
> diff --git a/framework/packet.py b/framework/packet.py index
> 976b82b..1f3f07d 100755
> --- a/framework/packet.py
> +++ b/framework/packet.py
> @@ -812,15 +812,31 @@ def get_filter_cmd(filters=[]):
>          return ""
> 
> 
> -def sniff_packets(intf, count=0, timeout=5, filters=[]):
> +def sniff_packets(intf, count=0, timeout=5, filters=[], target=[]):
>      """
>      sniff all packets for certain port in certain seconds
>      """
>      param = ""
>      direct_param = r"(\s+)\[ (\S+) in\|out\|inout \]"
> -    tcpdump_help = subprocess.check_output("tcpdump -h; echo 0",
> -                                           stderr=subprocess.STDOUT,
> -                                           shell=True)
> +    remote_terminate = 0
> +
> +    # target[] contain the remote machine info for ssh connection
> +    # target[0]: username
> +    # target[1]: ip address
> +    # target[2]: pass word
> +    if target:
> +        tcpdump_help_pipe = subprocess.Popen(["ssh",
> +                            "%s@%s" % (target[0], target[1]),
> +                            "tcpdump -h"],
> +                            stderr=subprocess.PIPE,
> +                            stdout=subprocess.PIPE,
> +                            shell=False)
> +        tcpdump_help = "".join(tuple(tcpdump_help_pipe.communicate()))
> +        tcpdump_help_pipe.wait()
> +    else:
> +        tcpdump_help = subprocess.check_output("tcpdump -h; echo 0",
> +                                    stderr=subprocess.STDOUT,
> + shell=True)
> +
>      for line in tcpdump_help.split('\n'):
>          m = re.match(direct_param, line)
>          if m:
> @@ -850,22 +866,29 @@ def sniff_packets(intf, count=0, timeout=5, filters=[]):
>      else:
>          cmd = sniff_cmd % options
> 
> -    args = shlex.split(cmd)
> +    if target:
> +        pipe = subprocess.Popen(['ssh',
> +                '%s@%s' % (target[0], target[1]), cmd],
> +                stdin=subprocess.PIPE,
> +                shell=False)
> +        remote_terminate = 1
> +    else:
> +        args = shlex.split(cmd)
> +        pipe = subprocess.Popen(args)
> 
> -    pipe = subprocess.Popen(args)
>      index = str(time.time())
> -    SNIFF_PIDS[index] = (pipe, intf, timeout)
> +    SNIFF_PIDS[index] = (pipe, intf, timeout, remote_terminate)
>      time.sleep(1)
>      return index
> 
> 
> -def load_sniff_pcap(index=''):
> +def load_sniff_pcap(index='', target=[]):
>      """
>      Stop sniffer and return pcap file
>      """
>      child_exit = False
>      if index in SNIFF_PIDS.keys():
> -        pipe, intf, timeout = SNIFF_PIDS[index]
> +        pipe, intf, timeout, remote_terminate = SNIFF_PIDS[index]
>          time_elapse = int(time.time() - float(index))
>          while time_elapse < timeout:
>              if pipe.poll() is not None:
> @@ -876,6 +899,14 @@ def load_sniff_pcap(index=''):
>              time_elapse += 1
> 
>          if not child_exit:
> +            if remote_terminate == 1:
> +                stop_tcpdump_pipe = subprocess.Popen(['ssh',
> +                                    '%s@%s' % (target[0], target[1]),
> +                                    'kill -2 $(pidof tcpdump)'],
> +                                    stderr=subprocess.PIPE,
> +                                    shell=False)
> +                stop_tcpdump_pipe.wait()
> +
>              pipe.send_signal(signal.SIGINT)
>              pipe.wait()
> 
> @@ -886,42 +917,6 @@ def load_sniff_pcap(index=''):
>      return ""
> 
> 
> -def load_sniff_packets(index=''):
> -    """
> -    Stop sniffer and return packet objects
> -    """
> -    pkts = []
> -    child_exit = False
> -    if index in SNIFF_PIDS.keys():
> -        pipe, intf, timeout = SNIFF_PIDS[index]
> -        time_elapse = int(time.time() - float(index))
> -        while time_elapse < timeout:
> -            if pipe.poll() is not None:
> -                child_exit = True
> -                break
> -
> -            time.sleep(1)
> -            time_elapse += 1
> -
> -        if not child_exit:
> -            pipe.send_signal(signal.SIGINT)
> -            pipe.wait()
> -
> -        # wait pcap file ready
> -        time.sleep(1)
> -        try:
> -            cap_pkts = rdpcap("/tmp/sniff_%s.pcap" % intf)
> -            for pkt in cap_pkts:
> -                # packet gen should be scapy
> -                packet = Packet(tx_port=intf)
> -                packet.pktgen.assign_pkt(pkt)
> -                pkts.append(packet)
> -        except:
> -            pass
> -
> -    return pkts
> -
> -
>  def load_pcapfile(filename=""):
>      pkts = []
>      try:
> @@ -983,7 +978,6 @@ if __name__ == "__main__":
>      inst = sniff_packets("lo", timeout=5)
>      pkt = Packet(pkt_type='UDP')
>      pkt.send_pkt(tx_port='lo')
> -    pkts = load_sniff_packets(inst)
> 
>      pkt = Packet(pkt_type='UDP', pkt_len=1500, ran_payload=True)
>      pkt.send_pkt(tx_port='lo')
> diff --git a/framework/tester.py b/framework/tester.py index a775f68..c5b705d
> 100755
> --- a/framework/tester.py
> +++ b/framework/tester.py
> @@ -35,6 +35,7 @@ Interface for bulk traffic generators.
> 
>  import re
>  import subprocess
> +import os
>  from time import sleep
>  from settings import NICS, load_global_setting, PERF_SETTING  from crb import
> Crb @@ -560,8 +561,6 @@ class Tester(Crb):
>          module = __import__("packet")
>          pkt_c = getattr(module, "Packet")
>          send_f = getattr(module, "send_packets")
> -        sniff_f = getattr(module, "sniff_packets")
> -        load_f = getattr(module, "load_sniff_packets")
>          compare_f = getattr(module, "compare_pktload")
>          strip_f = getattr(module, "strip_pktload")
>          save_f = getattr(module, "save_packets") @@ -606,7 +605,7 @@ class
> Tester(Crb):
> 
>              # send and sniff packets
>              save_f(pkts=pkts, filename="/tmp/%s_tx.pcap" % txIntf)
> -            inst = sniff_f(intf=rxIntf, count=pktnum, timeout=timeout, filters=
> +            inst = self.tcpdump_sniff_packets(intf=rxIntf,
> + count=pktnum, timeout=timeout, filters=
>                  [{'layer': 'network', 'config': {'srcport': '65535'}},
>                   {'layer': 'network', 'config': {'dstport': '65535'}}])
>              rx_inst[rxport] = inst
> @@ -627,7 +626,7 @@ class Tester(Crb):
>          # Verify all packets
>          prev_id = -1
>          for txport, rxport in portList:
> -            recv_pkts = load_f(rx_inst[rxport])
> +            recv_pkts =
> + self.load_tcpdump_sniff_packets(rx_inst[rxport])
> 
>              # only report when recevied number not matched
>              if len(tx_pkts[txport]) > len(recv_pkts):
> @@ -704,6 +703,47 @@ class Tester(Crb):
>              self.proc.kill()
>              self.proc = None
> 
> +    def tcpdump_sniff_packets(self, intf, count=0, timeout=5, filters=[]):
> +        """
> +        Wrapper for packet module sniff_packets
> +        """
> +        # load functions in packet module
> +        module = __import__("packet")
> +        sniff_f = getattr(module, "sniff_packets")
> +
> +        target=[]
> +        target.append(self.get_username())
> +        target.append(self.get_ip_address())
> +        target.append(self.get_password())
> +        return sniff_f(intf, count, timeout, filters, target)
> +
> +    def load_tcpdump_sniff_pcap(self, index=''):
> +        """
> +        Wrapper for packet module load_sniff_pcap
> +        """
> +        # load functions in packet module
> +        module = __import__("packet")
> +        load_pcap_f = getattr(module, "load_sniff_pcap")
> +
> +        target=[]
> +        target.append(self.get_username())
> +        target.append(self.get_ip_address())
> +        target.append(self.get_password())
> +        pcap = load_pcap_f(index, target)
> +        self.session.copy_file_from(pcap)
> +
> +        return pcap.split(os.sep)[-1]
> +
> +    def load_tcpdump_sniff_packets(self, index=''):
> +        """
> +        Wrapper for packet module load_pcapfile
> +        """
> +        # load functions in packet module
> +        packet = __import__("packet")
> +        file = self.load_tcpdump_sniff_pcap(index)
> +
> +        return packet.load_pcapfile(file)
> +
>      def kill_all(self, killall=False):
>          """
>          Kill all scapy process or DPDK application on tester.
> --
> 2.7.4
>