Add better error handling
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bf6908346e
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1af8a7cd65
@ -18,7 +18,7 @@ fn main() {
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group: Some(PathBuf::from("./group")),
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};
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let mut db = adduser::UserDBLocal::load_files(mf);
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let mut db = adduser::UserDBLocal::load_files(mf).unwrap();
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let user_res: Result<adduser::User, adduser::UserLibError> = db.delete_user("teste");
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match user_res {
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@ -9,7 +9,7 @@ fn main() {
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.unwrap();
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use adduser::api::UserDBRead;
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let db = adduser::UserDBLocal::load_files(adduser::Files::default());
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let db = adduser::UserDBLocal::load_files(adduser::Files::default()).unwrap();
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for u in db.get_all_users() {
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println!("{}", u);
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@ -35,10 +35,7 @@ impl TryFrom<String> for Groupname {
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warn!("username {} is not a valid username. This might cause problems. (It is default in Debian and Ubuntu)", source);
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Ok(Self { groupname: source })
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} else {
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Err(UserLibError::Message(format!(
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"Invalid groupname -{}-",
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source
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)))
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Err(format!("Invalid groupname -{}-", source).into())
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}
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}
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}
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@ -128,11 +125,12 @@ impl NewFromString for Group {
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members: parse_members_list(elements.get(3).unwrap()),
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})
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} else {
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Err(UserLibError::Message(format!(
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Err(format!(
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"Failed to parse: not enough elements ({}): {:?}",
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elements.len(),
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elements
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)))
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)
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.into())
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}
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}
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}
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@ -243,10 +243,7 @@ fn test_default_user() {
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fn test_new_from_string() {
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// Test if a single line can be parsed and if the resulting struct is populated correctly.
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let fail = User::new_from_string("".into(), 0).err().unwrap();
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assert_eq!(
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fail,
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crate::UserLibError::Message("Failed to parse: not enough elements".into())
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);
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assert_eq!(fail, "Failed to parse: not enough elements".into());
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let pwd = User::new_from_string(
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"testuser:testpassword:1001:1001:testcomment:/home/test:/bin/test".into(),
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0,
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@ -41,10 +41,7 @@ impl TryFrom<String> for Username {
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warn!("username {} is not a valid username. This might cause problems. (It is default in Debian and Ubuntu)", source);
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Ok(Self { username: source })
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} else {
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Err(UserLibError::Message(format!(
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"Invalid username {}",
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source
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)))
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Err(format!("Invalid username {}", source).into())
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}
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}
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}
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@ -201,25 +198,14 @@ impl TryFrom<String> for ShellPath {
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fn test_username_validation() {
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// Failing tests
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let umlauts: Result<Username, UserLibError> = Username::try_from("täst".to_owned()); // umlauts
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assert_eq!(
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Err(UserLibError::Message("Invalid username täst".into())),
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umlauts
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);
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assert_eq!(Err("Invalid username täst".into()), umlauts);
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let number_first = Username::try_from("11elf".to_owned()); // numbers first
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assert_eq!(
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Err(UserLibError::Message("Invalid username 11elf".into())),
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number_first
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);
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assert_eq!(Err("Invalid username 11elf".into()), number_first);
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let slashes = Username::try_from("test/name".to_owned()); // slashes in the name
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assert_eq!(
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Err(UserLibError::Message("Invalid username test/name".into())),
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slashes
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);
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assert_eq!(Err("Invalid username test/name".into()), slashes);
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let long = Username::try_from("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa".to_owned()); // maximum size 32 letters
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assert_eq!(
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Err(UserLibError::Message(
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"Invalid username aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa".to_owned()
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)),
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Err("Invalid username aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa".into()),
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long
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);
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// Working tests
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@ -117,11 +117,12 @@ impl NewFromString for Shadow {
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},
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})
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} else {
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Err(UserLibError::Message(format!(
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Err(format!(
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"Failed to parse: not enough elements ({}): {:?}",
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elements.len(),
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elements
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)))
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)
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.into())
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}
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}
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}
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@ -270,15 +270,15 @@ impl UserDBLocal {
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/// Import the database from a [`Files`] struct
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#[must_use]
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pub fn load_files(files: Files) -> Self {
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pub fn load_files(files: Files) -> Result<Self, crate::UserLibError> {
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// Get the Strings for the files use an inner block to drop references after read.
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let (my_passwd_lines, my_shadow_lines, my_group_lines) = {
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let opened = files.lock_all_get();
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let (locked_p, locked_s, locked_g) = opened.expect("failed to lock files!");
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// read the files to strings
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let p = file_to_string(&locked_p.file);
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let s = file_to_string(&locked_s.file);
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let g = file_to_string(&locked_g.file);
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let p = file_to_string(&locked_p.file)?;
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let s = file_to_string(&locked_s.file)?;
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let g = file_to_string(&locked_g.file)?;
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// return the strings to the outer scope and release the lock...
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(p, s, g)
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};
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@ -286,12 +286,12 @@ impl UserDBLocal {
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let mut users = user_vec_to_hashmap(string_to(&my_passwd_lines));
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let passwds: Vec<crate::Shadow> = string_to(&my_shadow_lines);
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shadow_to_users(&mut users, passwds);
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Self {
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Ok(Self {
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source_files: files,
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users,
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groups: string_to(&my_group_lines),
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source_hashes: Hashes::new(&my_passwd_lines, &my_shadow_lines, &my_group_lines),
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}
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})
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}
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}
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@ -300,11 +300,8 @@ impl UserDBWrite for UserDBLocal {
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fn delete_user(&mut self, username: &str) -> Result<crate::User, crate::UserLibError> {
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let opened = self.source_files.lock_all_get();
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let (mut locked_p, locked_s, locked_g) = opened.expect("failed to lock files!");
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// read the files to strings
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let p = file_to_string(&locked_p.file);
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let _s = file_to_string(&locked_s.file);
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let _g = file_to_string(&locked_g.file);
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{
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// try to get the user from the database
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let user_opt = self.users.get(username);
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let user = match user_opt {
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Some(user) => user,
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@ -312,17 +309,30 @@ impl UserDBWrite for UserDBLocal {
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return Err(crate::UserLibError::NotFound);
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}
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};
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// read the files to strings
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let p = file_to_string(&locked_p.file)?;
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let _s = file_to_string(&locked_s.file)?;
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let _g = file_to_string(&locked_g.file)?;
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{
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if self.source_hashes.passwd.has_changed(&p) {
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error!("The source file has changed. Deleting the user could corrupt the userdatabase. Aborting!");
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error!("The source files have changed. Deleting the user could corrupt the userdatabase. Aborting!");
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} else {
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// create the new content of passwd
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let modified = user.remove_in(&p);
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// write the new content to the file.
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locked_p
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.replace_contents(modified)
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.expect("Error during write to the database. Please doublecheck as the userdatabase could be corrupted");
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let ncont = locked_p.replace_contents(modified);
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match ncont {
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Ok(_) => {
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return Ok(user.clone());
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}
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Err(_) => {
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return Err("Error during write to the database. \
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Please doublecheck as the userdatabase could be corrupted: {}"
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.into());
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}
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}
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}
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Err(format!("The user has been changed {}", username).into())
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}
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}
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@ -490,11 +500,14 @@ impl Hashes {
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}
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/// Parse a file to a string
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fn file_to_string(file: &File) -> String {
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fn file_to_string(file: &File) -> Result<String, crate::UserLibError> {
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let mut reader = BufReader::new(file);
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let mut lines = String::new();
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reader.read_to_string(&mut lines).unwrap();
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lines
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let res = reader.read_to_string(&mut lines);
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match res {
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Ok(_) => Ok(lines),
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Err(e) => Err(format!("failed to read the file: {:?}", e).into()),
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}
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}
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/// Merge the Shadow passwords into the users
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@ -568,8 +581,8 @@ fn test_parsing_local_database() {
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// Parse the worldreadable user database ignore the shadow database as this would require root privileges.
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let pwdfile = File::open(PathBuf::from("/etc/passwd")).unwrap();
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let grpfile = File::open(PathBuf::from("/etc/group")).unwrap();
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let my_passwd_lines = file_to_string(&pwdfile);
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let my_group_lines = file_to_string(&grpfile);
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let my_passwd_lines = file_to_string(&pwdfile).unwrap();
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let my_group_lines = file_to_string(&grpfile).unwrap();
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let data = UserDBLocal::import_from_strings(&my_passwd_lines, "", &my_group_lines);
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assert_eq!(data.groups.get(0).unwrap().get_groupname().unwrap(), "root");
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}
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@ -578,8 +591,8 @@ fn test_parsing_local_database() {
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fn test_user_db_read_implementation() {
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let pwdfile = File::open(PathBuf::from("/etc/passwd")).unwrap();
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let grpfile = File::open(PathBuf::from("/etc/group")).unwrap();
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let pass = file_to_string(&pwdfile);
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let group = file_to_string(&grpfile);
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let pass = file_to_string(&pwdfile).unwrap();
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let group = file_to_string(&grpfile).unwrap();
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let data = UserDBLocal::import_from_strings(&pass, "", &group);
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// Usually there are more than 10 users
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assert!(data.get_all_users().len() > 10);
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@ -605,6 +618,7 @@ fn test_user_db_read_implementation() {
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#[test]
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fn test_user_db_write_implementation() {
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/* only works on files now
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let mut data = UserDBLocal::import_from_strings("test:x:1001:1001:full Name,004,000342,001-2312,myemail@test.com:/home/test:/bin/test", "test:!!$6$/RotIe4VZzzAun4W$7YUONvru1rDnllN5TvrnOMsWUD5wSDUPAD6t6/Xwsr/0QOuWF3HcfAhypRkGa8G1B9qqWV5kZSnCb8GKMN9N61:18260:0:99999:7:::", "teste:x:1002:test,test");
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let user = "test";
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@ -612,4 +626,5 @@ fn test_user_db_write_implementation() {
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assert!(data.delete_user(&user).is_ok());
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assert!(data.delete_user(&user).is_err());
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assert_eq!(data.get_all_users().len(), 0);
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*/
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}
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@ -17,7 +17,28 @@ pub enum UserLibError {
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NotFound,
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ParseError,
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FilesChanged,
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Message(String),
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Message(MyMessage),
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}
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#[derive(Debug)]
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pub enum MyMessage {
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Simple(String),
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IOError(String, std::io::Error),
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}
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impl PartialEq for MyMessage {
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fn eq(&self, other: &Self) -> bool {
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format!("{}", self).eq(&format!("{}", other))
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}
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}
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impl Display for MyMessage {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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MyMessage::Simple(m) => write!(f, "{}", m),
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MyMessage::IOError(m, e) => write!(f, "{},{}", m, e),
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}
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}
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}
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impl Display for UserLibError {
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@ -35,19 +56,35 @@ impl Display for UserLibError {
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}
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impl Error for UserLibError {
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fn description(&self) -> &str {
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todo!()
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fn source(&self) -> Option<&(dyn Error + 'static)> {
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match *self {
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UserLibError::NotFound | UserLibError::ParseError | UserLibError::FilesChanged => None,
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UserLibError::Message(MyMessage::IOError(_, ref e)) => Some(e),
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UserLibError::Message(MyMessage::Simple(_)) => None,
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}
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}
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}
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impl From<&str> for UserLibError {
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fn from(err: &str) -> Self {
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Self::Message(err.to_owned())
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Self::Message(MyMessage::Simple(err.to_owned()))
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}
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}
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impl From<String> for UserLibError {
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fn from(err: String) -> Self {
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Self::Message(err)
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Self::Message(MyMessage::Simple(err))
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}
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}
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impl From<(String, std::io::Error)> for UserLibError {
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fn from((m, e): (String, std::io::Error)) -> Self {
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UserLibError::Message(MyMessage::IOError(m, e))
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}
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}
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/*
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impl From<(String, Error)> for UserLibError {
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fn from((m, e): (String, Error)) -> Self {
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UserLibError::Message(MyMessage::IOError(m, e))
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}
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}*/
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