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use crate::error::SnmpError;
use crate::snmp::*;
use crate::snmpv3::*;
use der_parser::ber::*;
use der_parser::error::*;
use nom::bytes::streaming::take;
use nom::combinator::map_res;
use nom::{Err, IResult};
use std::str;
#[derive(Debug, PartialEq)]
pub enum SnmpGenericMessage<'a> {
V1(SnmpMessage<'a>),
V2(SnmpMessage<'a>),
V3(SnmpV3Message<'a>),
}
fn parse_snmp_v1_pdu_content(i: &[u8]) -> IResult<&[u8], SnmpMessage, BerError> {
let (i, community) = map_res(parse_ber_octetstring_as_slice, str::from_utf8)(i)?;
let (i, pdu) = parse_snmp_v1_pdu(i)?;
let msg = SnmpMessage {
version: 0,
community: community.to_string(),
pdu,
};
Ok((i, msg))
}
fn parse_snmp_v2c_pdu_content(i: &[u8]) -> IResult<&[u8], SnmpMessage, BerError> {
let (i, community) = map_res(parse_ber_octetstring_as_slice, str::from_utf8)(i)?;
let (i, pdu) = parse_snmp_v2c_pdu(i)?;
let msg = SnmpMessage {
version: 1,
community: community.to_string(),
pdu,
};
Ok((i, msg))
}
fn parse_snmp_v3_pdu_content(i: &[u8]) -> IResult<&[u8], SnmpV3Message, BerError> {
let (i, hdr) = parse_snmp_v3_headerdata(i)?;
let (i, secp) = map_res(parse_ber_octetstring, |x| parse_secp(&x, &hdr))(i)?;
let (i, data) = parse_snmp_v3_data(i, &hdr)?;
let msg = SnmpV3Message {
version: 3,
header_data: hdr,
security_params: secp,
data,
};
Ok((i, msg))
}
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 len = hdr
.len
.primitive()
.map_err(|_| SnmpError::BerError(BerError::InvalidLength))?;
let (rem, data) = take(len)(rem)?;
let (r, version) = parse_ber_u32(data).map_err(Err::convert)?;
match version {
0 => {
let (rem, msg) = parse_snmp_v1_pdu_content(r).map_err(Err::convert)?;
Ok((rem, SnmpGenericMessage::V1(msg)))
}
1 => {
let (rem, msg) = parse_snmp_v2c_pdu_content(r).map_err(Err::convert)?;
Ok((rem, SnmpGenericMessage::V2(msg)))
}
3 => {
let (rem, msg) = parse_snmp_v3_pdu_content(r).map_err(Err::convert)?;
Ok((rem, SnmpGenericMessage::V3(msg)))
}
_ => Err(Err::Error(SnmpError::InvalidVersion)),
}
.map(|(_, res)| (rem, res))
}