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tcpdump/tests/rstp-v.out
Guy Harris b7b72b7c63 Treat the length field in an Ethernet header as such. 
If we have an Ethernet packet where the last 2 octets of the header are
a length rather than an Ethernet type, and it's less than the remaining
length of the packet, shorten the length and captured length, update the
snapshot end.

Turn the buffer stack into a "packet information" stack, so that, if we
*do* update the snapshot end, we push the old end onto the stack, and
pop it off as soon as we're done dissecting the Ethernet packet, in case
there's more data in the packet after the Ethernet packet.

Use the stack when we use the IPv4 and IPv6 length fields as well.
2019-04-22 23:49:02 -07:00

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1 11:50:35.352170 STP 802.1w, Rapid STP, Flags [Proposal], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
2 11:50:37.214151 STP 802.1w, Rapid STP, Flags [Proposal], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
3 11:50:39.227534 STP 802.1w, Rapid STP, Flags [Proposal], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
4 11:50:41.240343 STP 802.1w, Rapid STP, Flags [Proposal], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
5 11:50:43.253615 STP 802.1w, Rapid STP, Flags [Proposal], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
6 11:50:45.266889 STP 802.1w, Rapid STP, Flags [Proposal], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
7 11:50:47.280508 STP 802.1w, Rapid STP, Flags [Proposal], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
8 11:50:49.293428 STP 802.1w, Rapid STP, Flags [Proposal], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
9 11:50:51.306707 STP 802.1w, Rapid STP, Flags [Proposal, Learn], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
10 11:50:53.320006 STP 802.1w, Rapid STP, Flags [Proposal, Learn], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
11 11:50:55.333257 STP 802.1w, Rapid STP, Flags [Proposal, Learn], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
12 11:50:57.346887 STP 802.1w, Rapid STP, Flags [Proposal, Learn], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
13 11:50:59.359867 STP 802.1w, Rapid STP, Flags [Proposal, Learn], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
14 11:51:01.373086 STP 802.1w, Rapid STP, Flags [Proposal, Learn], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
15 11:51:03.386550 STP 802.1w, Rapid STP, Flags [Proposal, Learn], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
16 11:51:05.365396 STP 802.1w, Rapid STP, Flags [Topology change, Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
17 11:51:05.399631 STP 802.1w, Rapid STP, Flags [Topology change, Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
18 11:51:07.413269 STP 802.1w, Rapid STP, Flags [Topology change, Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
19 11:51:09.426184 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
20 11:51:11.439472 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
21 11:51:13.452762 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
22 11:51:15.466142 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
23 11:51:17.479631 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
24 11:51:19.492583 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
25 11:51:21.505865 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
26 11:51:23.519148 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
27 11:51:25.532418 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
28 11:51:27.546083 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
29 11:51:29.559090 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
30 11:51:31.572240 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 8001.00:19:06:ea:b8:80.800c, length 36
message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s
root-id 8001.00:19:06:ea:b8:80, root-pathcost 0, port-role Designated
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