Added support for realpath.

src/packet.rs

@@ -3,40 +3,63 @@ pub mod header;
 pub mod types;
 
 use crate::constants::SSH_FXP_INIT;
+use crate::constants::SSH_FXP_REALPATH;
 use crate::constants::SSH_FXP_VERSION;
+use crate::constants::SSH_FXP_NAME;
 
 use std::io::{BufReader, BufWriter, Read, Write};
 use std::process::exit;
 
 pub fn dispatch_packet(packet: Packet) {
     let mut buff_stdout = BufWriter::new(std::io::stdout());
-    if packet.packet_header.type_packet == SSH_FXP_INIT {
-        let init_packet_data: data::version::VersionData =
-            match data::version::VersionData::deserialize(&packet.data) {
-                Ok(ok) => ok,
-                Err(err) => panic!(err),
-            };
-        eprintln!("The client version is {}.", init_packet_data.version);
-        if init_packet_data.version < 3 {
-            panic!("Unsupported version, minimal client version 3.");
-        }
-        let version_packet_data = data::version::VersionData {
-            version: 3,
-            extension_data: Vec::new(),
+    let mut response: Packet = match packet.packet_header.type_packet {
+        SSH_FXP_INIT => dispatch_version_request(packet),
+        SSH_FXP_REALPATH => dispatch_realpath_request(packet),
+        _ => panic!("{} not implemented.", packet.packet_header.type_packet),
+    };
+    let serialized_response = response.serialize();
+    eprintln!("Writing response.");
+    eprintln!("{:#?}", &serialized_response);
+    buff_stdout
+        .write(&serialized_response)
+        .expect("Unable to write to stdout.");
+    buff_stdout.flush().expect("Unable to flush stdout.");
+}
+
+fn dispatch_realpath_request(packet: Packet) -> Packet {
+    let realpath_packet_data: data::realpath::RealpathData =
+        data::realpath::RealpathData::deserialize(&packet.data);
+    let path = crate::sftp::realpath(&realpath_packet_data.path);
+    let id = realpath_packet_data.id;
+    Packet {
+        packet_header: header::PacketHeader {
+            length: 0,
+            type_packet: SSH_FXP_NAME,
+        },
+        data: crate::packet::data::name::NameData::new(id, &[path]).serialize(),
+    }
+}
+
+fn dispatch_version_request(packet: Packet) -> Packet {
+    let init_packet_data: data::version::VersionData =
+        match data::version::VersionData::deserialize(&packet.data) {
+            Ok(ok) => ok,
+            Err(err) => panic!(err),
         };
-        let mut response_packet = Packet {
-            packet_header: header::PacketHeader {
-                length: 0,
-                type_packet: SSH_FXP_VERSION,
-            },
-            data: version_packet_data.serialize(),
-        };
-        let serialized_response = response_packet.serialize();
-        eprintln!("{:#?}", &serialized_response);
-        buff_stdout
-            .write(&serialized_response)
-            .expect("Unable to write to stdout.");
-        buff_stdout.flush().expect("Unable to flush stdout.");
+    eprintln!("The client version is {}.", init_packet_data.version);
+    if init_packet_data.version < 3 {
+        panic!("Unsupported version, minimal client version 3.");
+    }
+    let version_packet_data = data::version::VersionData {
+        version: 3,
+        extension_data: Vec::new(),
+    };
+    Packet {
+        packet_header: header::PacketHeader {
+            length: 0,
+            type_packet: SSH_FXP_VERSION,
+        },
+        data: version_packet_data.serialize(),
     }
 }
 

src/packet/data.rs

@@ -1 +1,3 @@
 pub mod version;
+pub mod realpath;
+pub mod name;

src/packet/data/name.rs

@@ -0,0 +1,59 @@
+pub struct NameData {
+    id: u32,
+    count: u32,
+    file_descriptions: Vec<FileDescription>,
+}
+
+struct FileDescription {
+    filename: String,
+    longname: String,
+    attrs: u32,
+}
+
+impl NameData {
+    pub fn new(id: u32, files: &[String]) -> NameData {
+        let count = files.len();
+        let files: Vec<FileDescription> = files
+            .iter()
+            .map(|a| FileDescription {
+                filename: a.to_string(),
+                longname: a.to_string(),
+                attrs: 0,
+            })
+            .collect();
+        NameData {
+            id: id,
+            count: count as u32,
+            file_descriptions: files,
+        }
+    }
+    pub fn serialize(&self) -> Vec<u8> {
+        let mut serialized_data: Vec<u8> = Vec::new();
+        serialized_data.extend(&self.id.to_be_bytes());
+        serialized_data.extend(&self.count.to_be_bytes());
+        serialized_data.extend(
+            self.file_descriptions
+                .iter()
+                .map(|a| a.serialize())
+                .collect::<Vec<Vec<u8>>>()
+                .concat(),
+        );
+        serialized_data
+    }
+}
+
+impl FileDescription {
+    fn serialize(&self) -> Vec<u8> {
+        let mut serialized_data: Vec<u8> = Vec::new();
+        let filename = crate::packet::types::string::String {
+            content: self.filename.clone(),
+        };
+        let longname = crate::packet::types::string::String {
+            content: self.longname.clone(),
+        };
+        serialized_data.extend(filename.serialize());
+        serialized_data.extend(longname.serialize());
+        serialized_data.extend(&self.attrs.to_be_bytes());
+        serialized_data
+    }
+}

src/packet/data/realpath.rs

@@ -0,0 +1,21 @@
+use std::io::Read;
+
+pub struct RealpathData {
+    pub id: u32,
+    pub path: String,
+}
+
+impl RealpathData {
+    pub fn deserialize(mut u8_array_data: &[u8]) -> RealpathData {
+        if u8_array_data.len() < 5 {
+            panic!("Realpath data is expected to be bigger.");
+        }
+        let mut id: [u8; 4] = [0; 4];
+        u8_array_data
+            .read(&mut id)
+            .expect("Failed to read id from realpath packet.");
+        let id = u32::from_be_bytes(id);
+        let path = crate::packet::types::string::String::deserialize(u8_array_data).content;
+        RealpathData { id: id, path: path }
+    }
+}

src/packet/types.rs

@@ -1 +1 @@
-pub mod str;
+pub mod string;

src/packet/types/str.rs

@@ -1,23 +0,0 @@
-use regex::Regex;
-use std::io::BufRead;
-
-pub fn serialize(string_to_serialize: &str) -> Vec<u8> {
-    [string_to_serialize, "\0"].join("").as_bytes().to_vec()
-}
-
-pub fn deserialize(bytes_to_deserialize: &[u8]) -> String {
-    Regex::new("\0$")
-        .expect("Unable to parse regex \\0$.")
-        .replace(
-            &String::from_utf8(bytes_to_deserialize.to_vec())
-                .expect("Get a utf-8 encoded ftp client."),
-            "",
-        )
-        .to_string()
-}
-
-pub fn get_u8_array_c_string_from_u8_array(mut u8_array: &[u8]) -> Vec<u8> {
-    let mut return_array: Vec<u8> = Vec::new();
-    u8_array.read_until(0, &mut return_array).expect("Could not read string from u8_array");
-    return_array
-}

src/packet/types/string.rs

@@ -0,0 +1,29 @@
+use std::io::Read;
+
+pub struct String {
+    pub content: std::string::String,
+}
+
+impl String {
+    pub fn serialize(&self) -> Vec<u8> {
+        let mut serialized: Vec<u8> = Vec::new();
+        let content = self.content.as_bytes();
+        serialized.extend(&(content.len() as u32).to_be_bytes());
+        serialized.extend(content);
+        serialized
+    }
+
+    pub fn deserialize(mut to_serialize: &[u8]) -> String {
+        let mut size: [u8; 4] = [0; 4];
+        to_serialize.read(&mut size).expect("Could not read string size.");
+        let size: u32 = u32::from_be_bytes(size);
+        let mut content: Vec<u8> = Vec::new();
+        content.resize(size as usize, 0);
+        to_serialize.read(&mut content).expect("Could not read string.");
+        let content = match std::string::String::from_utf8(content.clone()) {
+            Ok(ok) => ok,
+            Err(err) => panic!("Error parsing {:#?} as utf-8: {}", content, err),
+        };
+        String { content: content }
+    }
+}