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-rw-r--r--rust/src/dns/dns.rs1526
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diff --git a/rust/src/dns/dns.rs b/rust/src/dns/dns.rs
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+/* Copyright (C) 2017-2022 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use std;
+use std::collections::HashMap;
+use std::collections::VecDeque;
+use std::ffi::CString;
+
+use crate::applayer::*;
+use crate::core::{self, *};
+use crate::dns::parser;
+use crate::frames::Frame;
+
+use nom7::number::streaming::be_u16;
+use nom7::{Err, IResult};
+
+/// DNS record types.
+pub const DNS_RECORD_TYPE_A: u16 = 1;
+pub const DNS_RECORD_TYPE_NS: u16 = 2;
+pub const DNS_RECORD_TYPE_MD: u16 = 3; // Obsolete
+pub const DNS_RECORD_TYPE_MF: u16 = 4; // Obsolete
+pub const DNS_RECORD_TYPE_CNAME: u16 = 5;
+pub const DNS_RECORD_TYPE_SOA: u16 = 6;
+pub const DNS_RECORD_TYPE_MB: u16 = 7; // Experimental
+pub const DNS_RECORD_TYPE_MG: u16 = 8; // Experimental
+pub const DNS_RECORD_TYPE_MR: u16 = 9; // Experimental
+pub const DNS_RECORD_TYPE_NULL: u16 = 10; // Experimental
+pub const DNS_RECORD_TYPE_WKS: u16 = 11;
+pub const DNS_RECORD_TYPE_PTR: u16 = 12;
+pub const DNS_RECORD_TYPE_HINFO: u16 = 13;
+pub const DNS_RECORD_TYPE_MINFO: u16 = 14;
+pub const DNS_RECORD_TYPE_MX: u16 = 15;
+pub const DNS_RECORD_TYPE_TXT: u16 = 16;
+pub const DNS_RECORD_TYPE_RP: u16 = 17;
+pub const DNS_RECORD_TYPE_AFSDB: u16 = 18;
+pub const DNS_RECORD_TYPE_X25: u16 = 19;
+pub const DNS_RECORD_TYPE_ISDN: u16 = 20;
+pub const DNS_RECORD_TYPE_RT: u16 = 21;
+pub const DNS_RECORD_TYPE_NSAP: u16 = 22;
+pub const DNS_RECORD_TYPE_NSAPPTR: u16 = 23;
+pub const DNS_RECORD_TYPE_SIG: u16 = 24;
+pub const DNS_RECORD_TYPE_KEY: u16 = 25;
+pub const DNS_RECORD_TYPE_PX: u16 = 26;
+pub const DNS_RECORD_TYPE_GPOS: u16 = 27;
+pub const DNS_RECORD_TYPE_AAAA: u16 = 28;
+pub const DNS_RECORD_TYPE_LOC: u16 = 29;
+pub const DNS_RECORD_TYPE_NXT: u16 = 30; // Obsolete
+pub const DNS_RECORD_TYPE_SRV: u16 = 33;
+pub const DNS_RECORD_TYPE_ATMA: u16 = 34;
+pub const DNS_RECORD_TYPE_NAPTR: u16 = 35;
+pub const DNS_RECORD_TYPE_KX: u16 = 36;
+pub const DNS_RECORD_TYPE_CERT: u16 = 37;
+pub const DNS_RECORD_TYPE_A6: u16 = 38; // Obsolete
+pub const DNS_RECORD_TYPE_DNAME: u16 = 39;
+pub const DNS_RECORD_TYPE_OPT: u16 = 41;
+pub const DNS_RECORD_TYPE_APL: u16 = 42;
+pub const DNS_RECORD_TYPE_DS: u16 = 43;
+pub const DNS_RECORD_TYPE_SSHFP: u16 = 44;
+pub const DNS_RECORD_TYPE_IPSECKEY: u16 = 45;
+pub const DNS_RECORD_TYPE_RRSIG: u16 = 46;
+pub const DNS_RECORD_TYPE_NSEC: u16 = 47;
+pub const DNS_RECORD_TYPE_DNSKEY: u16 = 48;
+pub const DNS_RECORD_TYPE_DHCID: u16 = 49;
+pub const DNS_RECORD_TYPE_NSEC3: u16 = 50;
+pub const DNS_RECORD_TYPE_NSEC3PARAM: u16 = 51;
+pub const DNS_RECORD_TYPE_TLSA: u16 = 52;
+pub const DNS_RECORD_TYPE_HIP: u16 = 55;
+pub const DNS_RECORD_TYPE_CDS: u16 = 59;
+pub const DNS_RECORD_TYPE_CDNSKEY: u16 = 60;
+pub const DNS_RECORD_TYPE_HTTPS: u16 = 65;
+pub const DNS_RECORD_TYPE_SPF: u16 = 99; // Obsolete
+pub const DNS_RECORD_TYPE_TKEY: u16 = 249;
+pub const DNS_RECORD_TYPE_TSIG: u16 = 250;
+pub const DNS_RECORD_TYPE_MAILA: u16 = 254; // Obsolete
+pub const DNS_RECORD_TYPE_ANY: u16 = 255;
+pub const DNS_RECORD_TYPE_URI: u16 = 256;
+
+/// DNS error codes.
+pub const DNS_RCODE_NOERROR: u16 = 0;
+pub const DNS_RCODE_FORMERR: u16 = 1;
+pub const DNS_RCODE_SERVFAIL: u16 = 2;
+pub const DNS_RCODE_NXDOMAIN: u16 = 3;
+pub const DNS_RCODE_NOTIMP: u16 = 4;
+pub const DNS_RCODE_REFUSED: u16 = 5;
+pub const DNS_RCODE_YXDOMAIN: u16 = 6;
+pub const DNS_RCODE_YXRRSET: u16 = 7;
+pub const DNS_RCODE_NXRRSET: u16 = 8;
+pub const DNS_RCODE_NOTAUTH: u16 = 9;
+pub const DNS_RCODE_NOTZONE: u16 = 10;
+// Support for OPT RR from RFC6891 will be needed to
+// parse RCODE values over 15
+pub const DNS_RCODE_BADVERS: u16 = 16;
+//also pub const DNS_RCODE_BADSIG: u16 = 16;
+pub const DNS_RCODE_BADKEY: u16 = 17;
+pub const DNS_RCODE_BADTIME: u16 = 18;
+pub const DNS_RCODE_BADMODE: u16 = 19;
+pub const DNS_RCODE_BADNAME: u16 = 20;
+pub const DNS_RCODE_BADALG: u16 = 21;
+pub const DNS_RCODE_BADTRUNC: u16 = 22;
+
+static mut ALPROTO_DNS: AppProto = ALPROTO_UNKNOWN;
+
+#[derive(AppLayerFrameType)]
+pub enum DnsFrameType {
+ /// DNS PDU frame. For UDP DNS this is the complete UDP payload, for TCP
+ /// this is the DNS payload not including the leading length field allowing
+ /// this frame to be used for UDP and TCP DNS.
+ Pdu,
+}
+
+#[derive(Debug, PartialEq, Eq, AppLayerEvent)]
+pub enum DNSEvent {
+ MalformedData,
+ NotRequest,
+ NotResponse,
+ ZFlagSet,
+ InvalidOpcode,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+#[repr(C)]
+pub struct DNSHeader {
+ pub tx_id: u16,
+ pub flags: u16,
+ pub questions: u16,
+ pub answer_rr: u16,
+ pub authority_rr: u16,
+ pub additional_rr: u16,
+}
+
+#[derive(Debug)]
+pub struct DNSQueryEntry {
+ pub name: Vec<u8>,
+ pub rrtype: u16,
+ pub rrclass: u16,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct DNSRDataSOA {
+ /// Primary name server for this zone
+ pub mname: Vec<u8>,
+ /// Authority's mailbox
+ pub rname: Vec<u8>,
+ /// Serial version number
+ pub serial: u32,
+ /// Refresh interval (seconds)
+ pub refresh: u32,
+ /// Retry interval (seconds)
+ pub retry: u32,
+ /// Upper time limit until zone is no longer authoritative (seconds)
+ pub expire: u32,
+ /// Minimum ttl for records in this zone (seconds)
+ pub minimum: u32,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct DNSRDataSSHFP {
+ /// Algorithm number
+ pub algo: u8,
+ /// Fingerprint type
+ pub fp_type: u8,
+ /// Fingerprint
+ pub fingerprint: Vec<u8>,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct DNSRDataSRV {
+ /// Priority
+ pub priority: u16,
+ /// Weight
+ pub weight: u16,
+ /// Port
+ pub port: u16,
+ /// Target
+ pub target: Vec<u8>,
+}
+
+/// Represents RData of various formats
+#[derive(Debug, PartialEq, Eq)]
+pub enum DNSRData {
+ // RData is an address
+ A(Vec<u8>),
+ AAAA(Vec<u8>),
+ // RData is a domain name
+ CNAME(Vec<u8>),
+ PTR(Vec<u8>),
+ MX(Vec<u8>),
+ NS(Vec<u8>),
+ // RData is text
+ TXT(Vec<u8>),
+ NULL(Vec<u8>),
+ // RData has several fields
+ SOA(DNSRDataSOA),
+ SRV(DNSRDataSRV),
+ SSHFP(DNSRDataSSHFP),
+ // RData for remaining types is sometimes ignored
+ Unknown(Vec<u8>),
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct DNSAnswerEntry {
+ pub name: Vec<u8>,
+ pub rrtype: u16,
+ pub rrclass: u16,
+ pub ttl: u32,
+ pub data: DNSRData,
+}
+
+#[derive(Debug)]
+pub struct DNSRequest {
+ pub header: DNSHeader,
+ pub queries: Vec<DNSQueryEntry>,
+}
+
+#[derive(Debug)]
+pub struct DNSResponse {
+ pub header: DNSHeader,
+ pub queries: Vec<DNSQueryEntry>,
+ pub answers: Vec<DNSAnswerEntry>,
+ pub authorities: Vec<DNSAnswerEntry>,
+}
+
+#[derive(Debug, Default)]
+pub struct DNSTransaction {
+ pub id: u64,
+ pub request: Option<DNSRequest>,
+ pub response: Option<DNSResponse>,
+ pub tx_data: AppLayerTxData,
+}
+
+impl Transaction for DNSTransaction {
+ fn id(&self) -> u64 {
+ self.id
+ }
+}
+
+impl DNSTransaction {
+ pub fn new(direction: Direction) -> Self {
+ Self {
+ tx_data: AppLayerTxData::for_direction(direction),
+ ..Default::default()
+ }
+ }
+
+ /// Get the DNS transactions ID (not the internal tracking ID).
+ pub fn tx_id(&self) -> u16 {
+ if let Some(request) = &self.request {
+ return request.header.tx_id;
+ }
+ if let Some(response) = &self.response {
+ return response.header.tx_id;
+ }
+
+ // Shouldn't happen.
+ return 0;
+ }
+
+ /// Get the reply code of the transaction. Note that this will
+ /// also return 0 if there is no reply.
+ pub fn rcode(&self) -> u16 {
+ if let Some(response) = &self.response {
+ return response.header.flags & 0x000f;
+ }
+ return 0;
+ }
+}
+
+struct ConfigTracker {
+ map: HashMap<u16, AppLayerTxConfig>,
+ queue: VecDeque<u16>,
+}
+
+impl ConfigTracker {
+ fn new() -> ConfigTracker {
+ ConfigTracker {
+ map: HashMap::new(),
+ queue: VecDeque::new(),
+ }
+ }
+
+ fn add(&mut self, id: u16, config: AppLayerTxConfig) {
+ // If at size limit, remove the oldest entry.
+ if self.queue.len() > 499 {
+ if let Some(id) = self.queue.pop_front() {
+ self.map.remove(&id);
+ }
+ }
+
+ self.map.insert(id, config);
+ self.queue.push_back(id);
+ }
+
+ fn remove(&mut self, id: &u16) -> Option<AppLayerTxConfig> {
+ self.map.remove(id)
+ }
+}
+
+#[derive(Default)]
+pub struct DNSState {
+ state_data: AppLayerStateData,
+
+ // Internal transaction ID.
+ pub tx_id: u64,
+
+ // Transactions.
+ pub transactions: VecDeque<DNSTransaction>,
+
+ config: Option<ConfigTracker>,
+
+ gap: bool,
+}
+
+impl State<DNSTransaction> for DNSState {
+ fn get_transaction_count(&self) -> usize {
+ self.transactions.len()
+ }
+
+ fn get_transaction_by_index(&self, index: usize) -> Option<&DNSTransaction> {
+ self.transactions.get(index)
+ }
+}
+
+impl DNSState {
+ pub fn new() -> Self {
+ Default::default()
+ }
+
+ pub fn new_tx(&mut self, direction: Direction) -> DNSTransaction {
+ let mut tx = DNSTransaction::new(direction);
+ self.tx_id += 1;
+ tx.id = self.tx_id;
+ return tx;
+ }
+
+ pub fn free_tx(&mut self, tx_id: u64) {
+ let len = self.transactions.len();
+ let mut found = false;
+ let mut index = 0;
+ for i in 0..len {
+ let tx = &self.transactions[i];
+ if tx.id == tx_id + 1 {
+ found = true;
+ index = i;
+ break;
+ }
+ }
+ if found {
+ self.transactions.remove(index);
+ }
+ }
+
+ pub fn get_tx(&mut self, tx_id: u64) -> Option<&DNSTransaction> {
+ SCLogDebug!("get_tx: tx_id={}", tx_id);
+ for tx in &mut self.transactions {
+ if tx.id == tx_id + 1 {
+ SCLogDebug!("Found DNS TX with ID {}", tx_id);
+ return Some(tx);
+ }
+ }
+ SCLogDebug!("Failed to find DNS TX with ID {}", tx_id);
+ return None;
+ }
+
+ /// Set an event. The event is set on the most recent transaction.
+ pub fn set_event(&mut self, event: DNSEvent) {
+ let len = self.transactions.len();
+ if len == 0 {
+ return;
+ }
+
+ let tx = &mut self.transactions[len - 1];
+ tx.tx_data.set_event(event as u8);
+ }
+
+ fn validate_header<'a>(&self, input: &'a [u8]) -> Option<(&'a [u8], DNSHeader)> {
+ if let Ok((body, header)) = parser::dns_parse_header(input) {
+ if probe_header_validity(&header, input.len()).0 {
+ return Some((body, header));
+ }
+ }
+ None
+ }
+
+ fn parse_request(&mut self, input: &[u8], is_tcp: bool) -> bool {
+ let (body, header) = if let Some((body, header)) = self.validate_header(input) {
+ (body, header)
+ } else {
+ return !is_tcp;
+ };
+
+ match parser::dns_parse_request_body(body, input, header) {
+ Ok((_, request)) => {
+ if request.header.flags & 0x8000 != 0 {
+ SCLogDebug!("DNS message is not a request");
+ self.set_event(DNSEvent::NotRequest);
+ return false;
+ }
+
+ let z_flag = request.header.flags & 0x0040 != 0;
+ let opcode = ((request.header.flags >> 11) & 0xf) as u8;
+
+ let mut tx = self.new_tx(Direction::ToServer);
+ tx.request = Some(request);
+ self.transactions.push_back(tx);
+
+ if z_flag {
+ SCLogDebug!("Z-flag set on DNS response");
+ self.set_event(DNSEvent::ZFlagSet);
+ }
+
+ if opcode >= 7 {
+ self.set_event(DNSEvent::InvalidOpcode);
+ }
+
+ return true;
+ }
+ Err(Err::Incomplete(_)) => {
+ // Insufficient data.
+ SCLogDebug!("Insufficient data while parsing DNS request");
+ self.set_event(DNSEvent::MalformedData);
+ return false;
+ }
+ Err(_) => {
+ // Error, probably malformed data.
+ SCLogDebug!("An error occurred while parsing DNS request");
+ self.set_event(DNSEvent::MalformedData);
+ return false;
+ }
+ }
+ }
+
+ fn parse_request_udp(&mut self, flow: *const core::Flow, stream_slice: StreamSlice) -> bool {
+ let input = stream_slice.as_slice();
+ let _pdu = Frame::new(
+ flow,
+ &stream_slice,
+ input,
+ input.len() as i64,
+ DnsFrameType::Pdu as u8,
+ );
+ self.parse_request(input, false)
+ }
+
+ fn parse_response_udp(&mut self, flow: *const core::Flow, stream_slice: StreamSlice) -> bool {
+ let input = stream_slice.as_slice();
+ let _pdu = Frame::new(
+ flow,
+ &stream_slice,
+ input,
+ input.len() as i64,
+ DnsFrameType::Pdu as u8,
+ );
+ self.parse_response(input, false)
+ }
+
+ pub fn parse_response(&mut self, input: &[u8], is_tcp: bool) -> bool {
+ let (body, header) = if let Some((body, header)) = self.validate_header(input) {
+ (body, header)
+ } else {
+ return !is_tcp;
+ };
+
+ match parser::dns_parse_response_body(body, input, header) {
+ Ok((_, response)) => {
+ SCLogDebug!("Response header flags: {}", response.header.flags);
+
+ if response.header.flags & 0x8000 == 0 {
+ SCLogDebug!("DNS message is not a response");
+ self.set_event(DNSEvent::NotResponse);
+ }
+
+ let z_flag = response.header.flags & 0x0040 != 0;
+ let opcode = ((response.header.flags >> 11) & 0xf) as u8;
+
+ let mut tx = self.new_tx(Direction::ToClient);
+ if let Some(ref mut config) = &mut self.config {
+ if let Some(config) = config.remove(&response.header.tx_id) {
+ tx.tx_data.config = config;
+ }
+ }
+ tx.response = Some(response);
+ self.transactions.push_back(tx);
+
+ if z_flag {
+ SCLogDebug!("Z-flag set on DNS response");
+ self.set_event(DNSEvent::ZFlagSet);
+ }
+
+ if opcode >= 7 {
+ self.set_event(DNSEvent::InvalidOpcode);
+ }
+
+ return true;
+ }
+ Err(Err::Incomplete(_)) => {
+ // Insufficient data.
+ SCLogDebug!("Insufficient data while parsing DNS response");
+ self.set_event(DNSEvent::MalformedData);
+ return false;
+ }
+ Err(_) => {
+ // Error, probably malformed data.
+ SCLogDebug!("An error occurred while parsing DNS response");
+ self.set_event(DNSEvent::MalformedData);
+ return false;
+ }
+ }
+ }
+
+ /// TCP variation of response request parser to handle the length
+ /// prefix.
+ ///
+ /// Returns the number of messages parsed.
+ pub fn parse_request_tcp(
+ &mut self, flow: *const core::Flow, stream_slice: StreamSlice,
+ ) -> AppLayerResult {
+ let input = stream_slice.as_slice();
+ if self.gap {
+ let (is_dns, _, is_incomplete) = probe_tcp(input);
+ if is_dns || is_incomplete {
+ self.gap = false;
+ } else {
+ AppLayerResult::ok();
+ }
+ }
+
+ let mut cur_i = input;
+ let mut consumed = 0;
+ while !cur_i.is_empty() {
+ if cur_i.len() == 1 {
+ return AppLayerResult::incomplete(consumed as u32, 2_u32);
+ }
+ let size = match be_u16(cur_i) as IResult<&[u8], u16> {
+ Ok((_, len)) => len,
+ _ => 0,
+ } as usize;
+ SCLogDebug!(
+ "[request] Have {} bytes, need {} to parse",
+ cur_i.len(),
+ size + 2
+ );
+ if size > 0 && cur_i.len() >= size + 2 {
+ let msg = &cur_i[2..(size + 2)];
+ let _pdu = Frame::new(
+ flow,
+ &stream_slice,
+ msg,
+ msg.len() as i64,
+ DnsFrameType::Pdu as u8,
+ );
+ if self.parse_request(msg, true) {
+ cur_i = &cur_i[(size + 2)..];
+ consumed += size + 2;
+ } else {
+ return AppLayerResult::err();
+ }
+ } else if size == 0 {
+ cur_i = &cur_i[2..];
+ consumed += 2;
+ } else {
+ SCLogDebug!(
+ "[request]Not enough DNS traffic to parse. Returning {}/{}",
+ consumed as u32,
+ (size + 2) as u32
+ );
+ return AppLayerResult::incomplete(consumed as u32, (size + 2) as u32);
+ }
+ }
+ AppLayerResult::ok()
+ }
+
+ /// TCP variation of the response parser to handle the length
+ /// prefix.
+ ///
+ /// Returns the number of messages parsed.
+ pub fn parse_response_tcp(
+ &mut self, flow: *const core::Flow, stream_slice: StreamSlice,
+ ) -> AppLayerResult {
+ let input = stream_slice.as_slice();
+ if self.gap {
+ let (is_dns, _, is_incomplete) = probe_tcp(input);
+ if is_dns || is_incomplete {
+ self.gap = false;
+ } else {
+ return AppLayerResult::ok();
+ }
+ }
+
+ let mut cur_i = input;
+ let mut consumed = 0;
+ while !cur_i.is_empty() {
+ if cur_i.len() == 1 {
+ return AppLayerResult::incomplete(consumed as u32, 2_u32);
+ }
+ let size = match be_u16(cur_i) as IResult<&[u8], u16> {
+ Ok((_, len)) => len,
+ _ => 0,
+ } as usize;
+ SCLogDebug!(
+ "[response] Have {} bytes, need {} to parse",
+ cur_i.len(),
+ size + 2
+ );
+ if size > 0 && cur_i.len() >= size + 2 {
+ let msg = &cur_i[2..(size + 2)];
+ let _pdu = Frame::new(
+ flow,
+ &stream_slice,
+ msg,
+ msg.len() as i64,
+ DnsFrameType::Pdu as u8,
+ );
+ if self.parse_response(msg, true) {
+ cur_i = &cur_i[(size + 2)..];
+ consumed += size + 2;
+ } else {
+ return AppLayerResult::err();
+ }
+ } else if size == 0 {
+ cur_i = &cur_i[2..];
+ consumed += 2;
+ } else {
+ SCLogDebug!(
+ "[response]Not enough DNS traffic to parse. Returning {}/{}",
+ consumed as u32,
+ (cur_i.len() - consumed) as u32
+ );
+ return AppLayerResult::incomplete(consumed as u32, (size + 2) as u32);
+ }
+ }
+ AppLayerResult::ok()
+ }
+
+ /// A gap has been seen in the request direction. Set the gap flag.
+ pub fn request_gap(&mut self, gap: u32) {
+ if gap > 0 {
+ self.gap = true;
+ }
+ }
+
+ /// A gap has been seen in the response direction. Set the gap
+ /// flag.
+ pub fn response_gap(&mut self, gap: u32) {
+ if gap > 0 {
+ self.gap = true;
+ }
+ }
+}
+
+const DNS_HEADER_SIZE: usize = 12;
+
+fn probe_header_validity(header: &DNSHeader, rlen: usize) -> (bool, bool, bool) {
+ let min_msg_size = 2
+ * (header.additional_rr as usize
+ + header.answer_rr as usize
+ + header.authority_rr as usize
+ + header.questions as usize)
+ + DNS_HEADER_SIZE;
+
+ if min_msg_size > rlen {
+ // Not enough data for records defined in the header, or
+ // impossibly large.
+ return (false, false, false);
+ }
+
+ let is_request = header.flags & 0x8000 == 0;
+ return (true, is_request, false);
+}
+
+/// Probe input to see if it looks like DNS.
+///
+/// Returns a tuple of booleans: (is_dns, is_request, incomplete)
+fn probe(input: &[u8], dlen: usize) -> (bool, bool, bool) {
+ // Trim input to dlen if larger.
+ let input = if input.len() <= dlen {
+ input
+ } else {
+ &input[..dlen]
+ };
+
+ // If input is less than dlen then we know we don't have enough data to
+ // parse a complete message, so perform header validation only.
+ if input.len() < dlen {
+ if let Ok((_, header)) = parser::dns_parse_header(input) {
+ return probe_header_validity(&header, dlen);
+ } else {
+ return (false, false, false);
+ }
+ }
+
+ match parser::dns_parse_request(input) {
+ Ok((_, request)) => {
+ return probe_header_validity(&request.header, dlen);
+ }
+ Err(Err::Incomplete(_)) => match parser::dns_parse_header(input) {
+ Ok((_, header)) => {
+ return probe_header_validity(&header, dlen);
+ }
+ Err(Err::Incomplete(_)) => (false, false, true),
+ Err(_) => (false, false, false),
+ },
+ Err(_) => (false, false, false),
+ }
+}
+
+/// Probe TCP input to see if it looks like DNS.
+pub fn probe_tcp(input: &[u8]) -> (bool, bool, bool) {
+ match be_u16(input) as IResult<&[u8], u16> {
+ Ok((rem, dlen)) => {
+ return probe(rem, dlen as usize);
+ }
+ Err(Err::Incomplete(_)) => {
+ return (false, false, true);
+ }
+ _ => {}
+ }
+ return (false, false, false);
+}
+
+/// Returns *mut DNSState
+#[no_mangle]
+pub extern "C" fn rs_dns_state_new(
+ _orig_state: *mut std::os::raw::c_void, _orig_proto: AppProto,
+) -> *mut std::os::raw::c_void {
+ let state = DNSState::new();
+ let boxed = Box::new(state);
+ return Box::into_raw(boxed) as *mut _;
+}
+
+/// Returns *mut DNSState
+#[no_mangle]
+pub extern "C" fn rs_dns_state_tcp_new() -> *mut std::os::raw::c_void {
+ let state = DNSState::new();
+ let boxed = Box::new(state);
+ return Box::into_raw(boxed) as *mut _;
+}
+
+/// Params:
+/// - state: *mut DNSState as void pointer
+#[no_mangle]
+pub extern "C" fn rs_dns_state_free(state: *mut std::os::raw::c_void) {
+ // Just unbox...
+ std::mem::drop(unsafe { Box::from_raw(state as *mut DNSState) });
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_state_tx_free(state: *mut std::os::raw::c_void, tx_id: u64) {
+ let state = cast_pointer!(state, DNSState);
+ state.free_tx(tx_id);
+}
+
+/// C binding parse a DNS request. Returns 1 on success, -1 on failure.
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_parse_request(
+ flow: *const core::Flow, state: *mut std::os::raw::c_void, _pstate: *mut std::os::raw::c_void,
+ stream_slice: StreamSlice, _data: *const std::os::raw::c_void,
+) -> AppLayerResult {
+ let state = cast_pointer!(state, DNSState);
+ state.parse_request_udp(flow, stream_slice);
+ AppLayerResult::ok()
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_parse_response(
+ flow: *const core::Flow, state: *mut std::os::raw::c_void, _pstate: *mut std::os::raw::c_void,
+ stream_slice: StreamSlice, _data: *const std::os::raw::c_void,
+) -> AppLayerResult {
+ let state = cast_pointer!(state, DNSState);
+ state.parse_response_udp(flow, stream_slice);
+ AppLayerResult::ok()
+}
+
+/// C binding parse a DNS request. Returns 1 on success, -1 on failure.
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_parse_request_tcp(
+ flow: *const core::Flow, state: *mut std::os::raw::c_void, _pstate: *mut std::os::raw::c_void,
+ stream_slice: StreamSlice, _data: *const std::os::raw::c_void,
+) -> AppLayerResult {
+ let state = cast_pointer!(state, DNSState);
+ if stream_slice.is_gap() {
+ state.request_gap(stream_slice.gap_size());
+ } else if !stream_slice.is_empty() {
+ return state.parse_request_tcp(flow, stream_slice);
+ }
+ AppLayerResult::ok()
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_parse_response_tcp(
+ flow: *const core::Flow, state: *mut std::os::raw::c_void, _pstate: *mut std::os::raw::c_void,
+ stream_slice: StreamSlice, _data: *const std::os::raw::c_void,
+) -> AppLayerResult {
+ let state = cast_pointer!(state, DNSState);
+ if stream_slice.is_gap() {
+ state.response_gap(stream_slice.gap_size());
+ } else if !stream_slice.is_empty() {
+ return state.parse_response_tcp(flow, stream_slice);
+ }
+ AppLayerResult::ok()
+}
+
+#[no_mangle]
+pub extern "C" fn rs_dns_tx_get_alstate_progress(
+ _tx: *mut std::os::raw::c_void, _direction: u8,
+) -> std::os::raw::c_int {
+ // This is a stateless parser, just the existence of a transaction
+ // means its complete.
+ SCLogDebug!("rs_dns_tx_get_alstate_progress");
+ return 1;
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_state_get_tx_count(state: *mut std::os::raw::c_void) -> u64 {
+ let state = cast_pointer!(state, DNSState);
+ SCLogDebug!("rs_dns_state_get_tx_count: returning {}", state.tx_id);
+ return state.tx_id;
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_state_get_tx(
+ state: *mut std::os::raw::c_void, tx_id: u64,
+) -> *mut std::os::raw::c_void {
+ let state = cast_pointer!(state, DNSState);
+ match state.get_tx(tx_id) {
+ Some(tx) => {
+ return tx as *const _ as *mut _;
+ }
+ None => {
+ return std::ptr::null_mut();
+ }
+ }
+}
+
+#[no_mangle]
+pub extern "C" fn rs_dns_tx_is_request(tx: &mut DNSTransaction) -> bool {
+ tx.request.is_some()
+}
+
+#[no_mangle]
+pub extern "C" fn rs_dns_tx_is_response(tx: &mut DNSTransaction) -> bool {
+ tx.response.is_some()
+}
+
+pub unsafe extern "C" fn rs_dns_state_get_tx_data(
+ tx: *mut std::os::raw::c_void,
+) -> *mut AppLayerTxData {
+ let tx = cast_pointer!(tx, DNSTransaction);
+ return &mut tx.tx_data;
+}
+
+export_state_data_get!(rs_dns_get_state_data, DNSState);
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_tx_get_query_name(
+ tx: &mut DNSTransaction, i: u32, buf: *mut *const u8, len: *mut u32,
+) -> u8 {
+ if let Some(request) = &tx.request {
+ if (i as usize) < request.queries.len() {
+ let query = &request.queries[i as usize];
+ if !query.name.is_empty() {
+ *len = query.name.len() as u32;
+ *buf = query.name.as_ptr();
+ return 1;
+ }
+ }
+ }
+ return 0;
+}
+
+/// Get the DNS transaction ID of a transaction.
+//
+/// extern uint16_t rs_dns_tx_get_tx_id(RSDNSTransaction *);
+#[no_mangle]
+pub extern "C" fn rs_dns_tx_get_tx_id(tx: &mut DNSTransaction) -> u16 {
+ return tx.tx_id();
+}
+
+/// Get the DNS response flags for a transaction.
+///
+/// extern uint16_t rs_dns_tx_get_response_flags(RSDNSTransaction *);
+#[no_mangle]
+pub extern "C" fn rs_dns_tx_get_response_flags(tx: &mut DNSTransaction) -> u16 {
+ return tx.rcode();
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_tx_get_query_rrtype(
+ tx: &mut DNSTransaction, i: u16, rrtype: *mut u16,
+) -> u8 {
+ if let Some(request) = &tx.request {
+ if (i as usize) < request.queries.len() {
+ let query = &request.queries[i as usize];
+ if !query.name.is_empty() {
+ *rrtype = query.rrtype;
+ return 1;
+ }
+ }
+ }
+ return 0;
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_probe(
+ _flow: *const core::Flow, _dir: u8, input: *const u8, len: u32, rdir: *mut u8,
+) -> AppProto {
+ if len == 0 || len < std::mem::size_of::<DNSHeader>() as u32 {
+ return core::ALPROTO_UNKNOWN;
+ }
+ let slice: &[u8] = std::slice::from_raw_parts(input as *mut u8, len as usize);
+ let (is_dns, is_request, _) = probe(slice, slice.len());
+ if is_dns {
+ let dir = if is_request {
+ Direction::ToServer
+ } else {
+ Direction::ToClient
+ };
+ *rdir = dir as u8;
+ return ALPROTO_DNS;
+ }
+ return 0;
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_probe_tcp(
+ _flow: *const core::Flow, direction: u8, input: *const u8, len: u32, rdir: *mut u8,
+) -> AppProto {
+ if len == 0 || len < std::mem::size_of::<DNSHeader>() as u32 + 2 {
+ return core::ALPROTO_UNKNOWN;
+ }
+ let slice: &[u8] = std::slice::from_raw_parts(input as *mut u8, len as usize);
+ //is_incomplete is checked by caller
+ let (is_dns, is_request, _) = probe_tcp(slice);
+ if is_dns {
+ let dir = if is_request {
+ Direction::ToServer
+ } else {
+ Direction::ToClient
+ };
+ if (direction & DIR_BOTH) != dir.into() {
+ *rdir = dir as u8;
+ }
+ return ALPROTO_DNS;
+ }
+ return 0;
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_apply_tx_config(
+ _state: *mut std::os::raw::c_void, _tx: *mut std::os::raw::c_void, _mode: std::os::raw::c_int,
+ config: AppLayerTxConfig,
+) {
+ let tx = cast_pointer!(_tx, DNSTransaction);
+ let state = cast_pointer!(_state, DNSState);
+ if let Some(request) = &tx.request {
+ if state.config.is_none() {
+ state.config = Some(ConfigTracker::new());
+ }
+ if let Some(ref mut tracker) = &mut state.config {
+ tracker.add(request.header.tx_id, config);
+ }
+ }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_udp_register_parser() {
+ let default_port = std::ffi::CString::new("[53]").unwrap();
+ let parser = RustParser {
+ name: b"dns\0".as_ptr() as *const std::os::raw::c_char,
+ default_port: default_port.as_ptr(),
+ ipproto: IPPROTO_UDP,
+ probe_ts: Some(rs_dns_probe),
+ probe_tc: Some(rs_dns_probe),
+ min_depth: 0,
+ max_depth: std::mem::size_of::<DNSHeader>() as u16,
+ state_new: rs_dns_state_new,
+ state_free: rs_dns_state_free,
+ tx_free: rs_dns_state_tx_free,
+ parse_ts: rs_dns_parse_request,
+ parse_tc: rs_dns_parse_response,
+ get_tx_count: rs_dns_state_get_tx_count,
+ get_tx: rs_dns_state_get_tx,
+ tx_comp_st_ts: 1,
+ tx_comp_st_tc: 1,
+ tx_get_progress: rs_dns_tx_get_alstate_progress,
+ get_eventinfo: Some(DNSEvent::get_event_info),
+ get_eventinfo_byid: Some(DNSEvent::get_event_info_by_id),
+ localstorage_new: None,
+ localstorage_free: None,
+ get_tx_files: None,
+ get_tx_iterator: Some(crate::applayer::state_get_tx_iterator::<DNSState, DNSTransaction>),
+ get_tx_data: rs_dns_state_get_tx_data,
+ get_state_data: rs_dns_get_state_data,
+ apply_tx_config: Some(rs_dns_apply_tx_config),
+ flags: 0,
+ truncate: None,
+ get_frame_id_by_name: Some(DnsFrameType::ffi_id_from_name),
+ get_frame_name_by_id: Some(DnsFrameType::ffi_name_from_id),
+ };
+
+ let ip_proto_str = CString::new("udp").unwrap();
+ if AppLayerProtoDetectConfProtoDetectionEnabled(ip_proto_str.as_ptr(), parser.name) != 0 {
+ let alproto = AppLayerRegisterProtocolDetection(&parser, 1);
+ ALPROTO_DNS = alproto;
+ if AppLayerParserConfParserEnabled(ip_proto_str.as_ptr(), parser.name) != 0 {
+ let _ = AppLayerRegisterParser(&parser, alproto);
+ }
+ }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_dns_tcp_register_parser() {
+ let default_port = std::ffi::CString::new("53").unwrap();
+ let parser = RustParser {
+ name: b"dns\0".as_ptr() as *const std::os::raw::c_char,
+ default_port: default_port.as_ptr(),
+ ipproto: IPPROTO_TCP,
+ probe_ts: Some(rs_dns_probe_tcp),
+ probe_tc: Some(rs_dns_probe_tcp),
+ min_depth: 0,
+ max_depth: std::mem::size_of::<DNSHeader>() as u16 + 2,
+ state_new: rs_dns_state_new,
+ state_free: rs_dns_state_free,
+ tx_free: rs_dns_state_tx_free,
+ parse_ts: rs_dns_parse_request_tcp,
+ parse_tc: rs_dns_parse_response_tcp,
+ get_tx_count: rs_dns_state_get_tx_count,
+ get_tx: rs_dns_state_get_tx,
+ tx_comp_st_ts: 1,
+ tx_comp_st_tc: 1,
+ tx_get_progress: rs_dns_tx_get_alstate_progress,
+ get_eventinfo: Some(DNSEvent::get_event_info),
+ get_eventinfo_byid: Some(DNSEvent::get_event_info_by_id),
+ localstorage_new: None,
+ localstorage_free: None,
+ get_tx_files: None,
+ get_tx_iterator: Some(crate::applayer::state_get_tx_iterator::<DNSState, DNSTransaction>),
+ get_tx_data: rs_dns_state_get_tx_data,
+ get_state_data: rs_dns_get_state_data,
+ apply_tx_config: Some(rs_dns_apply_tx_config),
+ flags: APP_LAYER_PARSER_OPT_ACCEPT_GAPS,
+ truncate: None,
+ get_frame_id_by_name: Some(DnsFrameType::ffi_id_from_name),
+ get_frame_name_by_id: Some(DnsFrameType::ffi_name_from_id),
+ };
+
+ let ip_proto_str = CString::new("tcp").unwrap();
+ if AppLayerProtoDetectConfProtoDetectionEnabled(ip_proto_str.as_ptr(), parser.name) != 0 {
+ let alproto = AppLayerRegisterProtocolDetection(&parser, 1);
+ ALPROTO_DNS = alproto;
+ if AppLayerParserConfParserEnabled(ip_proto_str.as_ptr(), parser.name) != 0 {
+ let _ = AppLayerRegisterParser(&parser, alproto);
+ }
+ }
+}
+
+#[cfg(test)]
+mod tests {
+
+ use super::*;
+
+ #[test]
+ fn test_dns_parse_request_tcp_valid() {
+ // A UDP DNS request with the DNS payload starting at byte 42.
+ // From pcap: https://github.com/jasonish/suricata-verify/blob/7cc0e1bd0a5249b52e6e87d82d57c0b6aaf75fce/dns-udp-dig-a-www-suricata-ids-org/dig-a-www.suricata-ids.org.pcap
+ #[rustfmt::skip]
+ let buf: &[u8] = &[
+ 0x00, 0x15, 0x17, 0x0d, 0x06, 0xf7, 0xd8, 0xcb, /* ........ */
+ 0x8a, 0xed, 0xa1, 0x46, 0x08, 0x00, 0x45, 0x00, /* ...F..E. */
+ 0x00, 0x4d, 0x23, 0x11, 0x00, 0x00, 0x40, 0x11, /* .M#...@. */
+ 0x41, 0x64, 0x0a, 0x10, 0x01, 0x0b, 0x0a, 0x10, /* Ad...... */
+ 0x01, 0x01, 0xa3, 0x4d, 0x00, 0x35, 0x00, 0x39, /* ...M.5.9 */
+ 0xb2, 0xb3, 0x8d, 0x32, 0x01, 0x20, 0x00, 0x01, /* ...2. .. */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x77, /* .......w */
+ 0x77, 0x77, 0x0c, 0x73, 0x75, 0x72, 0x69, 0x63, /* ww.suric */
+ 0x61, 0x74, 0x61, 0x2d, 0x69, 0x64, 0x73, 0x03, /* ata-ids. */
+ 0x6f, 0x72, 0x67, 0x00, 0x00, 0x01, 0x00, 0x01, /* org..... */
+ 0x00, 0x00, 0x29, 0x10, 0x00, 0x00, 0x00, 0x00, /* ..)..... */
+ 0x00, 0x00, 0x00 /* ... */
+ ];
+
+ // The DNS payload starts at offset 42.
+ let dns_payload = &buf[42..];
+
+ // Make a TCP DNS request payload.
+ let mut request = Vec::new();
+ request.push(((dns_payload.len() as u16) >> 8) as u8);
+ request.push(((dns_payload.len() as u16) & 0xff) as u8);
+ request.extend(dns_payload);
+
+ let mut state = DNSState::new();
+ assert_eq!(
+ AppLayerResult::ok(),
+ state.parse_request_tcp(
+ std::ptr::null(),
+ StreamSlice::from_slice(&request, STREAM_TOSERVER, 0)
+ )
+ );
+ }
+
+ #[test]
+ fn test_dns_parse_request_tcp_short_payload() {
+ // A UDP DNS request with the DNS payload starting at byte 42.
+ // From pcap: https://github.com/jasonish/suricata-verify/blob/7cc0e1bd0a5249b52e6e87d82d57c0b6aaf75fce/dns-udp-dig-a-www-suricata-ids-org/dig-a-www.suricata-ids.org.pcap
+ #[rustfmt::skip]
+ let buf: &[u8] = &[
+ 0x00, 0x15, 0x17, 0x0d, 0x06, 0xf7, 0xd8, 0xcb, /* ........ */
+ 0x8a, 0xed, 0xa1, 0x46, 0x08, 0x00, 0x45, 0x00, /* ...F..E. */
+ 0x00, 0x4d, 0x23, 0x11, 0x00, 0x00, 0x40, 0x11, /* .M#...@. */
+ 0x41, 0x64, 0x0a, 0x10, 0x01, 0x0b, 0x0a, 0x10, /* Ad...... */
+ 0x01, 0x01, 0xa3, 0x4d, 0x00, 0x35, 0x00, 0x39, /* ...M.5.9 */
+ 0xb2, 0xb3, 0x8d, 0x32, 0x01, 0x20, 0x00, 0x01, /* ...2. .. */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x77, /* .......w */
+ 0x77, 0x77, 0x0c, 0x73, 0x75, 0x72, 0x69, 0x63, /* ww.suric */
+ 0x61, 0x74, 0x61, 0x2d, 0x69, 0x64, 0x73, 0x03, /* ata-ids. */
+ 0x6f, 0x72, 0x67, 0x00, 0x00, 0x01, 0x00, 0x01, /* org..... */
+ 0x00, 0x00, 0x29, 0x10, 0x00, 0x00, 0x00, 0x00, /* ..)..... */
+ 0x00, 0x00, 0x00 /* ... */
+ ];
+
+ // The DNS payload starts at offset 42.
+ let dns_payload = &buf[42..];
+
+ // Make a TCP DNS request payload but with the length 1 larger
+ // than the available data.
+ let mut request = Vec::new();
+ request.push(((dns_payload.len() as u16) >> 8) as u8);
+ request.push(((dns_payload.len() as u16) & 0xff) as u8 + 1);
+ request.extend(dns_payload);
+
+ let mut state = DNSState::new();
+ assert_eq!(
+ AppLayerResult::incomplete(0, 52),
+ state.parse_request_tcp(
+ std::ptr::null(),
+ StreamSlice::from_slice(&request, STREAM_TOSERVER, 0)
+ )
+ );
+ }
+
+ #[test]
+ fn test_dns_parse_response_tcp_valid() {
+ // A UDP DNS response with the DNS payload starting at byte 42.
+ // From pcap: https://github.com/jasonish/suricata-verify/blob/7cc0e1bd0a5249b52e6e87d82d57c0b6aaf75fce/dns-udp-dig-a-www-suricata-ids-org/dig-a-www.suricata-ids.org.pcap
+ #[rustfmt::skip]
+ let buf: &[u8] = &[
+ 0xd8, 0xcb, 0x8a, 0xed, 0xa1, 0x46, 0x00, 0x15, /* .....F.. */
+ 0x17, 0x0d, 0x06, 0xf7, 0x08, 0x00, 0x45, 0x00, /* ......E. */
+ 0x00, 0x80, 0x65, 0x4e, 0x40, 0x00, 0x40, 0x11, /* ..eN@.@. */
+ 0xbe, 0xf3, 0x0a, 0x10, 0x01, 0x01, 0x0a, 0x10, /* ........ */
+ 0x01, 0x0b, 0x00, 0x35, 0xa3, 0x4d, 0x00, 0x6c, /* ...5.M.l */
+ 0x8d, 0x8c, 0x8d, 0x32, 0x81, 0xa0, 0x00, 0x01, /* ...2.... */
+ 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x03, 0x77, /* .......w */
+ 0x77, 0x77, 0x0c, 0x73, 0x75, 0x72, 0x69, 0x63, /* ww.suric */
+ 0x61, 0x74, 0x61, 0x2d, 0x69, 0x64, 0x73, 0x03, /* ata-ids. */
+ 0x6f, 0x72, 0x67, 0x00, 0x00, 0x01, 0x00, 0x01, /* org..... */
+ 0xc0, 0x0c, 0x00, 0x05, 0x00, 0x01, 0x00, 0x00, /* ........ */
+ 0x0d, 0xd8, 0x00, 0x12, 0x0c, 0x73, 0x75, 0x72, /* .....sur */
+ 0x69, 0x63, 0x61, 0x74, 0x61, 0x2d, 0x69, 0x64, /* icata-id */
+ 0x73, 0x03, 0x6f, 0x72, 0x67, 0x00, 0xc0, 0x32, /* s.org..2 */
+ 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0xf4, /* ........ */
+ 0x00, 0x04, 0xc0, 0x00, 0x4e, 0x18, 0xc0, 0x32, /* ....N..2 */
+ 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0xf4, /* ........ */
+ 0x00, 0x04, 0xc0, 0x00, 0x4e, 0x19 /* ....N. */
+ ];
+
+ // The DNS payload starts at offset 42.
+ let dns_payload = &buf[42..];
+
+ // Make a TCP DNS response payload.
+ let mut request = Vec::new();
+ request.push(((dns_payload.len() as u16) >> 8) as u8);
+ request.push(((dns_payload.len() as u16) & 0xff) as u8);
+ request.extend(dns_payload);
+
+ let mut state = DNSState::new();
+ assert_eq!(
+ AppLayerResult::ok(),
+ state.parse_response_tcp(
+ std::ptr::null(),
+ StreamSlice::from_slice(&request, STREAM_TOCLIENT, 0)
+ )
+ );
+ }
+
+ // Test that a TCP DNS payload won't be parsed if there is not
+ // enough data.
+ #[test]
+ fn test_dns_parse_response_tcp_short_payload() {
+ // A UDP DNS response with the DNS payload starting at byte 42.
+ // From pcap: https://github.com/jasonish/suricata-verify/blob/7cc0e1bd0a5249b52e6e87d82d57c0b6aaf75fce/dns-udp-dig-a-www-suricata-ids-org/dig-a-www.suricata-ids.org.pcap
+ #[rustfmt::skip]
+ let buf: &[u8] = &[
+ 0xd8, 0xcb, 0x8a, 0xed, 0xa1, 0x46, 0x00, 0x15, /* .....F.. */
+ 0x17, 0x0d, 0x06, 0xf7, 0x08, 0x00, 0x45, 0x00, /* ......E. */
+ 0x00, 0x80, 0x65, 0x4e, 0x40, 0x00, 0x40, 0x11, /* ..eN@.@. */
+ 0xbe, 0xf3, 0x0a, 0x10, 0x01, 0x01, 0x0a, 0x10, /* ........ */
+ 0x01, 0x0b, 0x00, 0x35, 0xa3, 0x4d, 0x00, 0x6c, /* ...5.M.l */
+ 0x8d, 0x8c, 0x8d, 0x32, 0x81, 0xa0, 0x00, 0x01, /* ...2.... */
+ 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x03, 0x77, /* .......w */
+ 0x77, 0x77, 0x0c, 0x73, 0x75, 0x72, 0x69, 0x63, /* ww.suric */
+ 0x61, 0x74, 0x61, 0x2d, 0x69, 0x64, 0x73, 0x03, /* ata-ids. */
+ 0x6f, 0x72, 0x67, 0x00, 0x00, 0x01, 0x00, 0x01, /* org..... */
+ 0xc0, 0x0c, 0x00, 0x05, 0x00, 0x01, 0x00, 0x00, /* ........ */
+ 0x0d, 0xd8, 0x00, 0x12, 0x0c, 0x73, 0x75, 0x72, /* .....sur */
+ 0x69, 0x63, 0x61, 0x74, 0x61, 0x2d, 0x69, 0x64, /* icata-id */
+ 0x73, 0x03, 0x6f, 0x72, 0x67, 0x00, 0xc0, 0x32, /* s.org..2 */
+ 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0xf4, /* ........ */
+ 0x00, 0x04, 0xc0, 0x00, 0x4e, 0x18, 0xc0, 0x32, /* ....N..2 */
+ 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0xf4, /* ........ */
+ 0x00, 0x04, 0xc0, 0x00, 0x4e, 0x19 /* ....N. */
+ ];
+
+ // The DNS payload starts at offset 42.
+ let dns_payload = &buf[42..];
+
+ // Make a TCP DNS response payload, but make the length 1 byte
+ // larger than the actual size.
+ let mut request = Vec::new();
+ request.push(((dns_payload.len() as u16) >> 8) as u8);
+ request.push((((dns_payload.len() as u16) & 0xff) + 1) as u8);
+ request.extend(dns_payload);
+
+ let mut state = DNSState::new();
+ assert_eq!(
+ AppLayerResult::incomplete(0, 103),
+ state.parse_response_tcp(
+ std::ptr::null(),
+ StreamSlice::from_slice(&request, STREAM_TOCLIENT, 0)
+ )
+ );
+ }
+
+ // Port of the C RustDNSUDPParserTest02 unit test.
+ #[test]
+ fn test_dns_udp_parser_test_01() {
+ /* query: abcdefghijk.com
+ * TTL: 86400
+ * serial 20130422 refresh 28800 retry 7200 exp 604800 min ttl 86400
+ * ns, hostmaster */
+ #[rustfmt::skip]
+ let buf: &[u8] = &[
+ 0x00, 0x3c, 0x85, 0x00, 0x00, 0x01, 0x00, 0x00,
+ 0x00, 0x01, 0x00, 0x00, 0x0b, 0x61, 0x62, 0x63,
+ 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b,
+ 0x03, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x0f, 0x00,
+ 0x01, 0x00, 0x00, 0x06, 0x00, 0x01, 0x00, 0x01,
+ 0x51, 0x80, 0x00, 0x25, 0x02, 0x6e, 0x73, 0x00,
+ 0x0a, 0x68, 0x6f, 0x73, 0x74, 0x6d, 0x61, 0x73,
+ 0x74, 0x65, 0x72, 0xc0, 0x2f, 0x01, 0x33, 0x2a,
+ 0x76, 0x00, 0x00, 0x70, 0x80, 0x00, 0x00, 0x1c,
+ 0x20, 0x00, 0x09, 0x3a, 0x80, 0x00, 0x01, 0x51,
+ 0x80,
+ ];
+ let mut state = DNSState::new();
+ assert!(state.parse_response(buf, false));
+ }
+
+ // Port of the C RustDNSUDPParserTest02 unit test.
+ #[test]
+ fn test_dns_udp_parser_test_02() {
+ #[rustfmt::skip]
+ let buf: &[u8] = &[
+ 0x6D,0x08,0x84,0x80,0x00,0x01,0x00,0x08,0x00,0x00,0x00,0x01,0x03,0x57,0x57,0x57,
+ 0x04,0x54,0x54,0x54,0x54,0x03,0x56,0x56,0x56,0x03,0x63,0x6F,0x6D,0x02,0x79,0x79,
+ 0x00,0x00,0x01,0x00,0x01,0xC0,0x0C,0x00,0x05,0x00,0x01,0x00,0x00,0x0E,0x10,0x00,
+ 0x02,0xC0,0x0C,0xC0,0x31,0x00,0x05,0x00,0x01,0x00,0x00,0x0E,0x10,0x00,0x02,0xC0,
+ 0x31,0xC0,0x3F,0x00,0x05,0x00,0x01,0x00,0x00,0x0E,0x10,0x00,0x02,0xC0,0x3F,0xC0,
+ 0x4D,0x00,0x05,0x00,0x01,0x00,0x00,0x0E,0x10,0x00,0x02,0xC0,0x4D,0xC0,0x5B,0x00,
+ 0x05,0x00,0x01,0x00,0x00,0x0E,0x10,0x00,0x02,0xC0,0x5B,0xC0,0x69,0x00,0x05,0x00,
+ 0x01,0x00,0x00,0x0E,0x10,0x00,0x02,0xC0,0x69,0xC0,0x77,0x00,0x05,0x00,0x01,0x00,
+ 0x00,0x0E,0x10,0x00,0x02,0xC0,0x77,0xC0,0x85,0x00,0x05,0x00,0x01,0x00,0x00,0x0E,
+ 0x10,0x00,0x02,0xC0,0x85,0x00,0x00,0x29,0x05,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+ ];
+ let mut state = DNSState::new();
+ assert!(state.parse_response(buf, false));
+ }
+
+ // Port of the C RustDNSUDPParserTest03 unit test.
+ #[test]
+ fn test_dns_udp_parser_test_03() {
+ #[rustfmt::skip]
+ let buf: &[u8] = &[
+ 0x6F,0xB4,0x84,0x80,0x00,0x01,0x00,0x02,0x00,0x02,0x00,0x03,0x03,0x57,0x57,0x77,
+ 0x0B,0x56,0x56,0x56,0x56,0x56,0x56,0x56,0x56,0x56,0x56,0x56,0x03,0x55,0x55,0x55,
+ 0x02,0x79,0x79,0x00,0x00,0x01,0x00,0x01,0xC0,0x0C,0x00,0x05,0x00,0x01,0x00,0x00,
+ 0x0E,0x10,0x00,0x02,0xC0,0x10,0xC0,0x34,0x00,0x01,0x00,0x01,0x00,0x00,0x0E,0x10,
+ 0x00,0x04,0xC3,0xEA,0x04,0x19,0xC0,0x34,0x00,0x02,0x00,0x01,0x00,0x00,0x0E,0x10,
+ 0x00,0x0A,0x03,0x6E,0x73,0x31,0x03,0x61,0x67,0x62,0xC0,0x20,0xC0,0x46,0x00,0x02,
+ 0x00,0x01,0x00,0x00,0x0E,0x10,0x00,0x06,0x03,0x6E,0x73,0x32,0xC0,0x56,0xC0,0x52,
+ 0x00,0x01,0x00,0x01,0x00,0x00,0x0E,0x10,0x00,0x04,0xC3,0xEA,0x04,0x0A,0xC0,0x68,
+ 0x00,0x01,0x00,0x01,0x00,0x00,0x0E,0x10,0x00,0x04,0xC3,0xEA,0x05,0x14,0x00,0x00,
+ 0x29,0x05,0x00,0x00,0x00,0x00,0x00,0x00,0x00
+ ];
+ let mut state = DNSState::new();
+ assert!(state.parse_response(buf, false));
+ }
+
+ // Port of the C RustDNSUDPParserTest04 unit test.
+ //
+ // Test the TXT records in an answer.
+ #[test]
+ fn test_dns_udp_parser_test_04() {
+ #[rustfmt::skip]
+ let buf: &[u8] = &[
+ 0xc2,0x2f,0x81,0x80,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x0a,0x41,0x41,0x41,
+ 0x41,0x41,0x4f,0x31,0x6b,0x51,0x41,0x05,0x3d,0x61,0x75,0x74,0x68,0x03,0x73,0x72,
+ 0x76,0x06,0x74,0x75,0x6e,0x6e,0x65,0x6c,0x03,0x63,0x6f,0x6d,0x00,0x00,0x10,0x00,
+ 0x01,
+ /* answer record start */
+ 0xc0,0x0c,0x00,0x10,0x00,0x01,0x00,0x00,0x00,0x03,0x00,0x22,
+ /* txt record starts: */
+ 0x20, /* <txt len 32 */ 0x41,0x68,0x76,0x4d,0x41,0x41,0x4f,0x31,0x6b,0x41,0x46,
+ 0x45,0x35,0x54,0x45,0x39,0x51,0x54,0x6a,0x46,0x46,0x4e,0x30,0x39,0x52,0x4e,0x31,
+ 0x6c,0x59,0x53,0x44,0x6b,0x00, /* <txt len 0 */ 0xc0,0x1d,0x00,0x02,0x00,0x01,
+ 0x00,0x09,0x3a,0x80,0x00,0x09,0x06,0x69,0x6f,0x64,0x69,0x6e,0x65,0xc0,0x21,0xc0,
+ 0x6b,0x00,0x01,0x00,0x01,0x00,0x09,0x3a,0x80,0x00,0x04,0x0a,0x1e,0x1c,0x5f
+ ];
+ let mut state = DNSState::new();
+ assert!(state.parse_response(buf, false));
+ }
+
+ // Port of the C RustDNSUDPParserTest05 unit test.
+ //
+ // Test TXT records in answer with a bad length.
+ #[test]
+ fn test_dns_udp_parser_test_05() {
+ #[rustfmt::skip]
+ let buf: &[u8] = &[
+ 0xc2,0x2f,0x81,0x80,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x0a,0x41,0x41,0x41,
+ 0x41,0x41,0x4f,0x31,0x6b,0x51,0x41,0x05,0x3d,0x61,0x75,0x74,0x68,0x03,0x73,0x72,
+ 0x76,0x06,0x74,0x75,0x6e,0x6e,0x65,0x6c,0x03,0x63,0x6f,0x6d,0x00,0x00,0x10,0x00,
+ 0x01,
+ /* answer record start */
+ 0xc0,0x0c,0x00,0x10,0x00,0x01,0x00,0x00,0x00,0x03,0x00,0x22,
+ /* txt record starts: */
+ 0x40, /* <txt len 64 */ 0x41,0x68,0x76,0x4d,0x41,0x41,0x4f,0x31,0x6b,0x41,0x46,
+ 0x45,0x35,0x54,0x45,0x39,0x51,0x54,0x6a,0x46,0x46,0x4e,0x30,0x39,0x52,0x4e,0x31,
+ 0x6c,0x59,0x53,0x44,0x6b,0x00, /* <txt len 0 */ 0xc0,0x1d,0x00,0x02,0x00,0x01,
+ 0x00,0x09,0x3a,0x80,0x00,0x09,0x06,0x69,0x6f,0x64,0x69,0x6e,0x65,0xc0,0x21,0xc0,
+ 0x6b,0x00,0x01,0x00,0x01,0x00,0x09,0x3a,0x80,0x00,0x04,0x0a,0x1e,0x1c,0x5f
+ ];
+ let mut state = DNSState::new();
+ assert!(!state.parse_response(buf, false));
+ }
+
+ // Port of the C RustDNSTCPParserTestMultiRecord unit test.
+ #[test]
+ fn test_dns_tcp_parser_multi_record() {
+ #[rustfmt::skip]
+ let buf: &[u8] = &[
+ 0x00, 0x1e, 0x00, 0x00, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x30,
+ 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
+ 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x1e, 0x00, 0x01, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x31,
+ 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
+ 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x1e, 0x00, 0x02, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x32,
+ 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
+ 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x1e, 0x00, 0x03, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x33,
+ 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
+ 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x1e, 0x00, 0x04, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x34,
+ 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
+ 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x1e, 0x00, 0x05, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x35,
+ 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
+ 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x1e, 0x00, 0x06, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x36,
+ 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
+ 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x1e, 0x00, 0x07, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x37,
+ 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
+ 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x1e, 0x00, 0x08, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x38,
+ 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
+ 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x1e, 0x00, 0x09, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x39,
+ 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
+ 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x1f, 0x00, 0x0a, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x31,
+ 0x30, 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65,
+ 0x03, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00,
+ 0x01, 0x00, 0x1f, 0x00, 0x0b, 0x01, 0x00, 0x00,
+ 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
+ 0x31, 0x31, 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c,
+ 0x65, 0x03, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01,
+ 0x00, 0x01, 0x00, 0x1f, 0x00, 0x0c, 0x01, 0x00,
+ 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x02, 0x31, 0x32, 0x06, 0x67, 0x6f, 0x6f, 0x67,
+ 0x6c, 0x65, 0x03, 0x63, 0x6f, 0x6d, 0x00, 0x00,
+ 0x01, 0x00, 0x01, 0x00, 0x1f, 0x00, 0x0d, 0x01,
+ 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x02, 0x31, 0x33, 0x06, 0x67, 0x6f, 0x6f,
+ 0x67, 0x6c, 0x65, 0x03, 0x63, 0x6f, 0x6d, 0x00,
+ 0x00, 0x01, 0x00, 0x01, 0x00, 0x1f, 0x00, 0x0e,
+ 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x02, 0x31, 0x34, 0x06, 0x67, 0x6f,
+ 0x6f, 0x67, 0x6c, 0x65, 0x03, 0x63, 0x6f, 0x6d,
+ 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x1f, 0x00,
+ 0x0f, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x02, 0x31, 0x35, 0x06, 0x67,
+ 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03, 0x63, 0x6f,
+ 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x1f,
+ 0x00, 0x10, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x02, 0x31, 0x36, 0x06,
+ 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03, 0x63,
+ 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00,
+ 0x1f, 0x00, 0x11, 0x01, 0x00, 0x00, 0x01, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x31, 0x37,
+ 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
+ 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
+ 0x00, 0x1f, 0x00, 0x12, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x31,
+ 0x38, 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65,
+ 0x03, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00,
+ 0x01, 0x00, 0x1f, 0x00, 0x13, 0x01, 0x00, 0x00,
+ 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
+ 0x31, 0x39, 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c,
+ 0x65, 0x03, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01,
+ 0x00, 0x01
+ ];
+
+ // A NULL flow.
+ let flow = std::ptr::null();
+
+ let mut state = DNSState::new();
+ assert_eq!(
+ AppLayerResult::ok(),
+ state.parse_request_tcp(flow, StreamSlice::from_slice(buf, STREAM_TOSERVER, 0))
+ );
+ }
+
+ #[test]
+ fn test_dns_tcp_parser_split_payload() {
+ // A NULL flow.
+ let flow = std::ptr::null();
+
+ /* incomplete payload */
+ #[rustfmt::skip]
+ let buf1: &[u8] = &[
+ 0x00, 0x1c, 0x10, 0x32, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+ ];
+ /* complete payload plus the start of a new payload */
+ #[rustfmt::skip]
+ let buf2: &[u8] = &[
+ 0x00, 0x1c, 0x10, 0x32, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x06, 0x67, 0x6F, 0x6F, 0x67, 0x6C, 0x65, 0x03,
+ 0x63, 0x6F, 0x6D, 0x00, 0x00, 0x10, 0x00, 0x01,
+
+ // next.
+ 0x00, 0x1c, 0x10, 0x32, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ ];
+
+ /* and the complete payload again with no trailing data. */
+ #[rustfmt::skip]
+ let buf3: &[u8] = &[
+ 0x00, 0x1c, 0x10, 0x32, 0x01, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x06, 0x67, 0x6F, 0x6F, 0x67, 0x6C, 0x65, 0x03,
+ 0x63, 0x6F, 0x6D, 0x00, 0x00, 0x10, 0x00, 0x01,
+ ];
+
+ let mut state = DNSState::new();
+ assert_eq!(
+ AppLayerResult::incomplete(0, 30),
+ state.parse_request_tcp(flow, StreamSlice::from_slice(buf1, STREAM_TOSERVER, 0))
+ );
+ assert_eq!(
+ AppLayerResult::incomplete(30, 30),
+ state.parse_request_tcp(flow, StreamSlice::from_slice(buf2, STREAM_TOSERVER, 0))
+ );
+ assert_eq!(
+ AppLayerResult::ok(),
+ state.parse_request_tcp(flow, StreamSlice::from_slice(buf3, STREAM_TOSERVER, 0))
+ );
+ }
+
+ #[test]
+ fn test_dns_event_from_id() {
+ assert_eq!(DNSEvent::from_id(0), Some(DNSEvent::MalformedData));
+ assert_eq!(DNSEvent::from_id(3), Some(DNSEvent::ZFlagSet));
+ assert_eq!(DNSEvent::from_id(9), None);
+ }
+
+ #[test]
+ fn test_dns_event_to_cstring() {
+ assert_eq!(DNSEvent::MalformedData.to_cstring(), "malformed_data\0");
+ }
+
+ #[test]
+ fn test_dns_event_from_string() {
+ let name = "malformed_data";
+ let event = DNSEvent::from_string(name).unwrap();
+ assert_eq!(event, DNSEvent::MalformedData);
+ assert_eq!(event.to_cstring(), format!("{}\0", name));
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-08 11:08:53 +0000