Add wildcard support

src/db/models.rs

@@ -35,16 +35,18 @@ impl Record {
     pub fn get(
         db: &mut PgConnection,
         name: String,
-        _type: i32,
+        _type: Option<i32>,
         class: i32,
     ) -> Result<Vec<Record>, diesel::result::Error> {
-        records::table
-            .filter(
-                records::name
-                    .eq(name)
-                    .and(records::_type.eq(_type).and(records::class.eq(class))),
-            )
-            .get_results(db)
+        let mut query = records::table.into_boxed();
+
+        query = query.filter(records::name.eq(name).and(records::class.eq(class)));
+
+        if let Some(value) = _type {
+            query = query.filter(records::_type.eq(value))
+        }
+
+        query.get_results(db)
     }
 
     pub fn create(
@@ -98,15 +100,18 @@ pub fn insert_into_database(rr: &RR, connection: &mut PgConnection) -> Result<()
 
 pub fn get_from_database(
     name: &Vec<String>,
-    _type: Type,
+    _type: Option<Type>,
     class: Class,
     connection: &mut PgConnection,
 ) -> Result<Vec<RR>, ZNSError> {
-    let records =
-        Record::get(connection, name.join("."), _type.into(), class.into()).map_err(|e| {
-            ZNSError::Database {
+    let records = Record::get(
+        connection,
+        name.join("."),
+        _type.map(|t| t.into()),
+        class.into(),
+    )
+    .map_err(|e| ZNSError::Database {
         message: e.to_string(),
-            }
     })?;
 
     Ok(records
@@ -154,7 +159,12 @@ mod tests {
         let rr = get_rr();
 
         let f = |connection: &mut PgConnection| {
-            get_from_database(&rr.name, rr._type.clone(), rr.class.clone(), connection)
+            get_from_database(
+                &rr.name,
+                Some(rr._type.clone()),
+                rr.class.clone(),
+                connection,
+            )
         };
 
         assert!(f(&mut connection).unwrap().is_empty());

src/handlers/query.rs

@@ -1,11 +1,16 @@
 use diesel::PgConnection;
 
-use crate::{db::models::get_from_database, errors::ZNSError, structs::Message};
+use crate::{
+    db::models::get_from_database,
+    errors::ZNSError,
+    structs::{Message, Question, RR},
+};
 
 use super::ResponseHandler;
 
 pub struct QueryHandler {}
 
+//TODO: the clones in this file should and could be avoided
 impl ResponseHandler for QueryHandler {
     async fn handle(
         message: &Message,
@@ -18,18 +23,21 @@ impl ResponseHandler for QueryHandler {
         for question in &message.question {
             let answers = get_from_database(
                 &question.qname,
-                question.qtype.clone(),
+                Some(question.qtype.clone()),
                 question.qclass.clone(),
                 connection,
             );
 
             match answers {
-                Ok(rrs) => {
+                Ok(mut rrs) => {
+                    if rrs.len() == 0 {
+                        rrs.extend(try_wildcard(question, connection)?);
                         if rrs.len() == 0 {
                             return Err(ZNSError::NXDomain {
                                 domain: question.qname.join("."),
                             });
                         }
+                    }
                     response.header.ancount += rrs.len() as u16;
                     response.answer.extend(rrs)
                 }
@@ -45,6 +53,23 @@ impl ResponseHandler for QueryHandler {
     }
 }
 
+fn try_wildcard(question: &Question, connection: &mut PgConnection) -> Result<Vec<RR>, ZNSError> {
+    let records = get_from_database(&question.qname, None, question.qclass.clone(), connection)?;
+
+    if records.len() > 0 {
+        Ok(vec![])
+    } else {
+        let mut qname = question.qname.clone();
+        qname[0] = String::from("*");
+        get_from_database(
+            &qname,
+            Some(question.qtype.clone()),
+            question.qclass.clone(),
+            connection,
+        )
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/handlers/update/authenticate.rs

@@ -58,7 +58,7 @@ async fn validate_dnskey(
 ) -> Result<bool, ZNSError> {
     Ok(get_from_database(
         zone,
-        Type::Type(RRType::DNSKEY),
+        Some(Type::Type(RRType::DNSKEY)),
         Class::Class(RRClass::IN),
         connection,
     )?

src/reader.rs

@@ -66,12 +66,12 @@ impl<'a> Reader<'a> {
     }
 
     pub fn seek(&self, position: usize) -> Result<Self> {
-        if position >= self.position {
+        if position >= self.position - 2 {
             Err(ZNSError::Reader {
                 message: String::from("Seeking into the future is not allowed!!"),
             })
         } else {
-            let mut reader = Reader::new(&self.buffer[0..self.position]);
+            let mut reader = Reader::new(&self.buffer[..self.position]);
             reader.position = position;
             Ok(reader)
         }