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use crate::error::SnmpError;
use crate::snmp::*;
use crate::snmpv3::*;
use der_parser::ber::*;
use nom::{Err, IResult};
use std::str;
#[derive(Debug, PartialEq)]
pub enum SnmpGenericMessage<'a> {
V1(SnmpMessage<'a>),
V2(SnmpMessage<'a>),
V3(SnmpV3Message<'a>),
}
pub fn parse_snmp_generic_message<'a>(
i: &'a [u8],
) -> IResult<&'a [u8], SnmpGenericMessage, SnmpError> {
let (rem, hdr) = ber_read_element_header(i).or(Err(Err::Error(SnmpError::InvalidMessage)))?;
if hdr.tag != BerTag::Sequence {
return Err(Err::Error(SnmpError::InvalidMessage));
}
let (rem, data) = take!(rem, hdr.len as usize)?;
let (r, version) = upgrade_error!(parse_ber_u32(data))?;
match version {
0 => upgrade_error!(do_parse! {
r,
community: map_res!(parse_ber_octetstring_as_slice, str::from_utf8) >>
pdu: parse_snmp_v1_pdu >>
(
SnmpGenericMessage::V1(SnmpMessage{
version,
community: community.to_string(),
pdu
})
)
}),
1 => upgrade_error!(do_parse! {
r,
community: map_res!(parse_ber_octetstring_as_slice, str::from_utf8) >>
pdu: parse_snmp_v2c_pdu >>
(
SnmpGenericMessage::V2(SnmpMessage{
version,
community: community.to_string(),
pdu
})
)
}),
3 => upgrade_error!(do_parse! {
r,
hdr: parse_snmp_v3_headerdata >>
secp: map_res!(parse_ber_octetstring, |x: BerObject<'a>| parse_secp(&x,&hdr)) >>
data: call!(parse_snmp_v3_data, &hdr) >>
(
SnmpGenericMessage::V3(SnmpV3Message{
version,
header_data: hdr,
security_params: secp,
data
})
)
}),
_ => Err(Err::Error(SnmpError::InvalidVersion)),
}
.map(|(_, res)| (rem, res))
}