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+--- Thread: Help Understanding Code (/thread-17940.html)
Help Understanding Code - Variables - Apr-30-2019
Hello Everyone
So i had to create a program that reads pcap files, takes the IP packet and shows it in a certain format. I had to ask for help and the person that helped me, didn't really explain what each line is doing. So if anyone can help me ill appreciate it.
def main():
try:
sys.argv[1]
dmp_file = sys.argv[1]
fp_dmp_file = open(dmp_file,'rb')
pcap = dpkt.pcap.Reader(fp_dmp_file)
pack_num = 0
total_size = 0
for ts, buf in pcap:
pkt_len = len(buf)
eth = dpkt.ethernet.Ethernet(buf)
ip = eth.data
src_ip = socket.inet_ntop(socket.AF_INET, ip.src)
dst_ip = socket.inet_ntop(socket.AF_INET, ip.dst)
src_port = ip.data.sport
dst_port = ip.data.dport
ttl = ip.ttl
protocol = ip.get_proto(ip.p).__name__
print_packet_info(ts,src_ip,src_port,dst_ip,dst_port,protocol,pkt_len,ttl)
pack_num += 1
total_size += pkt_len
avg_size = total_size/pack_num
print_summary(pack_num,total_size,avg_size)
except Exception as e:
#print(e)
print("Error: please supply pcap filename!\n")
if __name__ == '__main__':
main()
RE: Help Understanding Code - micseydel - May-02-2019
Why don't you start by adding comments about what you think is happening, and we can correct any misconceptions from there.