mirror of
https://github.com/zeek/zeek.git
synced 2025-10-02 06:38:20 +00:00
6908d1b919
Previously, a single `icmp_conn` record was built per ICMP "connection"
and re-used for all events generated from it. This may have been a
historical attempt at performance optimization, but:
* By default, Zeek does not load any scripts that handle ICMP events.
* The one script Zeek ships with that does handle ICMP events,
"detect-traceroute", is already noted as being disabled due to
potential performance problems of doing that kind of analysis.
* Re-use of the original `icmp_conn` record tends to misreport
TTL and length values since they come from original packet instead
of the current one.
* Even if we chose to still re-use `icmp_conn` records and just fill
in a new TTL and length value each packet, a user script could have
stored a reference to the record and not be expecting those values
to be changed out from underneath them.
Now, a new `icmp_info` record is created/populated in all ICMP events
and should be used instead of `icmp_conn`. It also removes the
orig_h/resp_h fields as those are redundant with what's already
available in the connection record.
20 lines
1.9 KiB
Text
20 lines
1.9 KiB
Text
icmp_unreachable (code=3)
|
|
conn_id: [orig_h=192.168.1.102, orig_p=3/icmp, resp_h=192.168.1.1, resp_p=3/icmp]
|
|
icmp_info: [v6=F, itype=3, icode=3, len=148, ttl=128]
|
|
icmp_context: [id=[orig_h=192.168.1.1, orig_p=53/udp, resp_h=192.168.1.102, resp_p=59207/udp], len=163, proto=2, frag_offset=0, bad_hdr_len=F, bad_checksum=F, MF=F, DF=F]
|
|
icmp_time_exceeded (code=0)
|
|
conn_id: [orig_h=10.0.0.1, orig_p=11/icmp, resp_h=10.0.0.2, resp_p=0/icmp]
|
|
icmp_info: [v6=F, itype=11, icode=0, len=32, ttl=64]
|
|
icmp_context: [id=[orig_h=10.0.0.2, orig_p=30000/udp, resp_h=10.0.0.1, resp_p=13000/udp], len=32, proto=2, frag_offset=0, bad_hdr_len=F, bad_checksum=F, MF=F, DF=F]
|
|
icmp_echo_request (id=34844, seq=0, payload=O\x85\xe0C\x00\x0e\xeb\xff\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&'()*+,-./01234567)
|
|
conn_id: [orig_h=10.0.0.1, orig_p=8/icmp, resp_h=74.125.225.99, resp_p=0/icmp]
|
|
icmp_info: [v6=F, itype=8, icode=0, len=56, ttl=64]
|
|
icmp_echo_reply (id=34844, seq=0, payload=O\x85\xe0C\x00\x0e\xeb\xff\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&'()*+,-./01234567)
|
|
conn_id: [orig_h=10.0.0.1, orig_p=8/icmp, resp_h=74.125.225.99, resp_p=0/icmp]
|
|
icmp_info: [v6=F, itype=0, icode=0, len=56, ttl=56]
|
|
icmp_echo_request (id=34844, seq=1, payload=O\x85\xe0D\x00\x0e\xf0}\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&'()*+,-./01234567)
|
|
conn_id: [orig_h=10.0.0.1, orig_p=8/icmp, resp_h=74.125.225.99, resp_p=0/icmp]
|
|
icmp_info: [v6=F, itype=8, icode=0, len=56, ttl=64]
|
|
icmp_echo_reply (id=34844, seq=1, payload=O\x85\xe0D\x00\x0e\xf0}\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&'()*+,-./01234567)
|
|
conn_id: [orig_h=10.0.0.1, orig_p=8/icmp, resp_h=74.125.225.99, resp_p=0/icmp]
|
|
icmp_info: [v6=F, itype=0, icode=0, len=56, ttl=56]
|