zeek/scripts/policy/protocols/ssh/software.zeek
Benjamin Bannier d5fd29edcd Prefer explicit construction to coercion in record initialization
While we support initializing records via coercion from an expression
list, e.g.,

    local x: X = [$x1=1, $x2=2];

this can sometimes obscure the code to readers, e.g., when assigning to
value declared and typed elsewhere. The language runtime has a similar
overhead since instead of just constructing a known type it needs to
check at runtime that the coercion from the expression list is valid;
this can be slower than just writing the readible code in the first
place, see #4559.

With this patch we use explicit construction, e.g.,

    local x = X($x1=1, $x2=2);
2025-07-11 16:28:37 -07:00

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##! Extracts SSH client and server information from SSH
##! connections and forwards it to the software framework.
@load base/frameworks/software
module SSH;
export {
redef enum Software::Type += {
## Identifier for SSH clients in the software framework.
SERVER,
## Identifier for SSH servers in the software framework.
CLIENT,
};
}
event ssh_client_version(c: connection, version: string) &priority=4
{
# Get rid of the protocol information when passing to the software framework.
local cleaned_version = sub(version, /^SSH[0-9\.\-]+/, "");
Software::found(c$id, Software::Info($unparsed_version=cleaned_version, $host=c$id$orig_h, $software_type=CLIENT));
}
event ssh_server_version(c: connection, version: string) &priority=4
{
# Get rid of the protocol information when passing to the software framework.
local cleaned_version = sub(version, /SSH[0-9\.\-]{2,}/, "");
Software::found(c$id, Software::Info($unparsed_version=cleaned_version, $host=c$id$resp_h, $host_p=c$id$resp_p, $software_type=SERVER));
}