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Configurable retries for snmp.lua

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dmiller
2024-11-12 20:05:57 +00:00
parent 10321be656
commit fdf5a2d7e9
1 changed files with 13 additions and 5 deletions
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18
nselib/snmp.lua
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@@ -3,6 +3,7 @@
-- --
-- @args snmp.version The SNMP protocol version. Use <code>"v1"</code> or <code>0</code> for SNMPv1 (default) and <code>"v2c"</code> or <code>1</code> for SNMPv2c. -- @args snmp.version The SNMP protocol version. Use <code>"v1"</code> or <code>0</code> for SNMPv1 (default) and <code>"v2c"</code> or <code>1</code> for SNMPv2c.
-- @args snmp.timeout The timeout for SNMP queries. Default: varies by target responsiveness, up to 5s. -- @args snmp.timeout The timeout for SNMP queries. Default: varies by target responsiveness, up to 5s.
-- @args snmp.retries The number of times a query should be reattempted. Default: 1
-- --
-- @author Patrik Karlsson <patrik@cqure.net> -- @author Patrik Karlsson <patrik@cqure.net>
-- @author Gioacchino Mazzurco <gmazzurco89@gmail.com> -- @author Gioacchino Mazzurco <gmazzurco89@gmail.com>
@@ -25,6 +26,7 @@ if arg_timeout then
arg_timeout = arg_timeout * 1000 arg_timeout = arg_timeout * 1000
end end
local default_max_timeout = 5000 --ms local default_max_timeout = 5000 --ms
local retries = stdnse.get_script_args("snmp.retries") or 1
-- SNMP ASN.1 Encoders -- SNMP ASN.1 Encoders
local tagEncoder = {} local tagEncoder = {}
@@ -523,13 +525,19 @@ Helper = {
self.community self.community
) ) ) )
local status, err = self.socket:send(payload) local received, data
if not status then for i=0, retries do
stdnse.debug2("snmp.Helper.request: Send to %s failed: %s", self.host.ip, err) local status, err = self.socket:send(payload)
return false, err if not status then
stdnse.debug2("snmp.Helper.request: Send to %s failed: %s", self.host.ip, err)
return false, err
end
received, data = self.socket:receive_bytes(1)
if received then break end
end end
return self.socket:receive_bytes(1) return received, data
end, end,
--- Sends an SNMP Get Next request --- Sends an SNMP Get Next request