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> On Mar 30, 2020, at 10:24 AM, Francois-Xavier Le Bail
> <devel.fx.leb...@orange.fr> wrote:
>
> Hi Guy,
>
> We have:
> $ git grep -n '"tcpdump"'
> netdissect.c:72: smiInit("tcpdump");
>
> netdissect.c is a part of libnetdissect.
>
> Should we use
> smiInit("libnetdissect");
> or something else to separate the lib and the tool ?
The man page at
https://www.ibr.cs.tu-bs.de/projects/libsmi/smi_config.html
says:
int smiInit(const char *tag);
...
The smiInit() function should be the first SMI function called in an
application. It initializes its internal structures. If tag is not NULL, the
global configuration file and (on UNIX systems) a user configuration file are
read implicitly, if existent. All global statements and those statements with
a tag (a ``tag: '' prefix) that matches the tag argument are executed. (see
also CONFIGURATION FILES below).
I don't know if anybody's actually *using* that particular libsmi feature, but
smiInit has been called with "tcpdump" as an argument since at least tcpdump
0.7. For what it's worth, the configuration file example they give in the man
page *does* have a "tcpdump:" statement in it:
Example configuration:
#
# $HOME/.smirc
#
# add a private directory
path :/usr/home/strauss/lib/mibs
# don’t show any errors by default
level 0
# preload some basic modules
load SNMPv2-SMI
load SNMPv2-TC
load SNMPv2-CONF
# want to make smilint shout
smilint: level 8
# but please don’t claim about
# any names longer than 32 chars
smilint: hide namelength-32
tcpdump: load DISMAN-SCRIPT-MIB
smiquery: load IF-MIB
smiquery: load DISMAN-SCRIPT-MIB
so there might be some who have "tcpdump:" statements in libsmi configuration
files.
So either
1) we should consider leaving "tcpdump" there
or
2) we should make the tag an argument to nd_init and pass it "tcpdump"
from tcpdump
although the latter means that any new program using libnetdissect might
dissect SNMP packets differently from tcpdump, whether that's a bug or a
feature.
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