1 files changed, 35 insertions, 0 deletions
diff --git a/rust/vendor/snmp-parser/src/usm.rs b/rust/vendor/snmp-parser/src/usm.rs
new file mode 100644
index 0000000..ecdbcad
--- /dev/null
+++ b/rust/vendor/snmp-parser/src/usm.rs
@@ -0,0 +1,35 @@
+//! RFC2274 - User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)
+
+use crate::parse_ber_octetstring_as_str;
+use asn1_rs::{Error, FromBer, Sequence};
+use nom::IResult;
+
+#[derive(Debug, PartialEq)]
+pub struct UsmSecurityParameters<'a> {
+    pub msg_authoritative_engine_id: &'a [u8],
+    pub msg_authoritative_engine_boots: u32,
+    pub msg_authoritative_engine_time: u32,
+    pub msg_user_name: String,
+    pub msg_authentication_parameters: &'a [u8],
+    pub msg_privacy_parameters: &'a [u8],
+}
+
+pub fn parse_usm_security_parameters(bytes: &[u8]) -> IResult<&[u8], UsmSecurityParameters, Error> {
+    Sequence::from_der_and_then(bytes, |i| {
+        let (i, msg_authoritative_engine_id) = <&[u8]>::from_ber(i)?;
+        let (i, msg_authoritative_engine_boots) = u32::from_ber(i)?;
+        let (i, msg_authoritative_engine_time) = u32::from_ber(i)?;
+        let (i, msg_user_name) = parse_ber_octetstring_as_str(i)?;
+        let (i, msg_authentication_parameters) = <&[u8]>::from_ber(i)?;
+        let (i, msg_privacy_parameters) = <&[u8]>::from_ber(i)?;
+        let usm = UsmSecurityParameters {
+            msg_authoritative_engine_id,
+            msg_authoritative_engine_boots,
+            msg_authoritative_engine_time,
+            msg_user_name: msg_user_name.to_string(),
+            msg_authentication_parameters,
+            msg_privacy_parameters,
+        };
+        Ok((i, usm))
+    })
+}