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add support for reading from filename#1

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chemag wants to merge 2 commits intobasvdl:masterfrom
chemag:master
Open

add support for reading from filename#1
chemag wants to merge 2 commits intobasvdl:masterfrom
chemag:master

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@chemag chemag commented Dec 10, 2020

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Tested:

```
$ make
$ ./dhcpdump -n -r /tmp/dhcp.pcap
...
TIME: 2020-12-10 09:26:29.123
  IP: 10.10.10.100 (aa:aa:aa:aa:aa:aa) > 10.10.10.55 (bb:bb:bb:bb:bb:bb)
  OP: 2 (BOOTPREPLY)
  HTYPE: 1 (Ethernet)
  HLEN: 6
  HOPS: 0
  XID: ffffffff
  SECS: 0
  FLAGS: 0
  CIADDR: 0.0.0.0
  YIADDR: 10.10.10.55
  SIADDR: 10.10.10.100
  GIADDR: 0.0.0.0
  CHADDR: BB:BB:BB:BB:BB:BB:00:00:00:00:00:00:00:00:00:00
  SNAME: .
  FNAME: .
  OPTION:  53 (  1) DHCP message type         5 (DHCPACK)
  OPTION:  54 (  4) Server identifier         10.10.10.100
  OPTION:  51 (  4) IP address leasetime      3600 (60m)
  OPTION:  58 (  4) T1                        1800 (30m)
  OPTION:  59 (  4) T2                        3150 (52m30s)
  OPTION:   1 (  4) Subnet mask               255.0.0.0
  OPTION:  28 (  4) Broadcast address         10.255.255.255
  OPTION:   3 (  4) Routers                   10.10.10.100
  OPTION:   6 (  4) DNS server                10.10.10.100
TIME: 2020-12-10 09:26:29.123
  IP: 10.10.10.55 (bb:bb:bb:bb:bb:bb) > 10.10.10.100 (aa:aa:aa:aa:aa:aa)
  OP: 1 (BOOTPREQUEST)
  HTYPE: 1 (Ethernet)
  HLEN: 6
  HOPS: 0
  XID: eeeeeeee
  SECS: 0
  FLAGS: 0
  CIADDR: 10.10.10.55
  YIADDR: 0.0.0.0
  SIADDR: 0.0.0.0
  GIADDR: 0.0.0.0
  CHADDR: BB:BB:BB:BB:BB:BB:00:00:00:00:00:00:00:00:00:00
  SNAME: .
  FNAME: .
  OPTION:  53 (  1) DHCP message type         7 (DHCPRELEASE)
  OPTION:  54 (  4) Server identifier         10.10.10.100
...
```
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