Add --overview and --no-print options to tcpdump

[dmcamens-legrand]

This PR adds the following command line options to tcpdump.

--overview: to print an overview of the contents of the capture
--no-print: to suppress printing of individual packets (useful with --overview)

The --overview option prints output that looks like the following. It can be used with either a live capture or a capture file (-r option).

OVERVIEW
--------
packets_captured: 331
bytes_captured: 132951
seconds: 7
hours: 0.00

SRC            DST              PACKETS BYTES
192.168.1.73   239.255.133.141        7  1101
192.168.1.74   239.255.133.141       69  8665
192.168.1.112  34.107.221.82          1    66
192.168.1.71   239.255.133.141        9   774
34.107.221.82  192.168.1.112          1    66
192.168.1.75   239.255.133.141       13  1615
192.168.1.112  34.160.144.191         2   178
34.160.144.191 192.168.1.112          2   178
63.254.192.168 1.122.0.0              6   360
192.168.1.142  224.0.0.251            2   140
192.168.1.116  224.0.0.251            8   712
192.168.1.112  192.168.100.1          2   200
192.168.1.76   239.255.133.141        8   688
192.168.1.108  224.0.0.251            9   843
192.168.100.1  192.168.1.112          2   261
192.168.1.110  224.0.0.251            8   712
192.168.1.71   239.255.255.250        9  3309
192.168.1.76   239.255.255.250        9  3309
192.168.1.70   239.255.133.141        5   430
1.0.3.0        12.244.31.84           1    60
192.168.1.72   239.255.133.141        6  1022
78.11.192.168  1.73.255.255           1    60
192.168.1.75   239.255.255.250        9  3309
192.168.1.122  255.255.255.255        2   120
192.168.1.104  224.0.0.251            7   535
0.0.0.0        255.157.127.146        1   151
192.168.1.71   224.0.0.251            1    80
192.168.1.100  224.0.0.251            1   394
192.168.1.74   224.0.0.251            1    80
192.168.1.124  224.0.0.251            1   394
192.168.1.119  224.0.0.251            1   402
192.168.1.75   224.0.0.251            1    80
192.168.1.76   224.0.0.251            1    80
192.168.1.73   224.0.0.251            1    80
192.168.1.70   224.0.0.251            1    80
192.168.1.16   192.168.1.255          3   189
32.0.0.0       0.128.0.164            3   357
192.168.1.72   224.0.0.251            1    80
192.168.1.71   224.0.0.147            1   236
192.168.1.112  72.21.91.29            5   330
72.21.91.29    192.168.1.112          5   330
192.168.1.76   224.0.0.147            1   236
192.168.1.74   224.0.0.147            1   236
192.168.1.112  104.76.214.179         1    66
192.168.1.112  23.34.242.11           1    66
192.168.1.112  18.67.79.46            1    66
192.168.1.73   224.0.0.147            1   235
104.76.214.179 192.168.1.112          1    66
23.34.242.11   192.168.1.112          1    66
18.67.79.46    192.168.1.112          1    66
192.168.1.75   224.0.0.147            1   236
192.168.1.112  75.75.77.2             8  1173
192.168.1.112  208.80.154.224        27  2415
75.75.77.2     192.168.1.112          9  1121
208.80.154.224 192.168.1.112         24 90030
192.168.1.112  142.251.163.94         1    66
142.251.163.94 192.168.1.112          1    66
192.168.1.16   239.255.255.250        1   143
192.168.1.70   224.0.0.147            1   236
192.168.1.70   239.255.255.250        9  3309
192.168.1.72   224.0.0.147            1   235
1.0.3.0        55.47.89.35            1    60
192.168.1.112  104.18.32.68           5   270
104.18.32.68   192.168.1.112          5   300
192.168.1.112  172.253.115.94         1    66
172.253.115.94 192.168.1.112          1    66

[infrastation]

Thank you for preparing these changes. Please note that this prototype has a few significant issues. To an extent this is caused by trying to retrofit a detailed statistics feature into a code base that is not designed to produce such output. This would be much better done in a separate program that takes a pcap savefile as an input.

In particular, please have a look at ipsumdump, which either already implements this type of statistics, or might be much easier to extend for that than tcpdump.

[dmcamens-legrand]

Hi @infrastation, thank you for looking at this PR and for your feedback. I am currently evaluating ipsumdump to see if it meets our needs and if not, if we could extend it instead. Thank you for your suggestion.