Pure Erlang implementation of 9p2000 protocol
filesystem
fs
9p2000
erlang
9p
Prevent unfs handler from walking out of root directory
+18
-3
+18
-3
src/e9p_unfs.erl
+18
-3
src/e9p_unfs.erl
···
6
6
7
7
-behaviour(e9p_fs).
8
8
9
-
% -include_lib("kernel/include/logger.hrl").
9
+
-include_lib("kernel/include/logger.hrl").
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10
-include_lib("kernel/include/file.hrl").
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11
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12
-export([init/1, root/3, walk/3, stat/2, open/3, read/4, clunk/2]).
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13
14
+
-doc """
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+
Create QID for given path.
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+
""".
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qid(Path) ->
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case file:read_file_info(Path, [{time, posix}]) of
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{ok, #file_info{type = Type, inode = Inode}} ->
···
19
22
{error, _} = Error -> Error
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23
end.
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+
-doc """
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+
Create QID and Stat data for given path.
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+
""".
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28
qid_stat(Root, Path) ->
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case file:read_file_info(Path, [{time, posix}]) of
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{ok, #file_info{type = Type, inode = Inode} = FI} ->
···
29
35
end.
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36
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init(#{path := Path}) ->
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-
{ok, #{root => Path}}.
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+
{ok, #{root => unicode:characters_to_binary(Path)}}.
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39
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-
root(_UName, _AName, #{root := Root} = State) ->
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+
root(UName, AName, #{root := Root} = State) ->
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+
?LOG_INFO(#{uname => UName, aname => AName}),
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42
maybe
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{ok, Qid} ?= qid(Root),
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{ok, Qid, State}
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45
end.
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46
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+
walk(#{state := {Root, _}}, ~"..", #{root := Root} = State) ->
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+
{false, State};
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+
walk(#{state := {Path, _}}, ~"..", State) ->
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+
Next = filename:dirname(Path),
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+
case qid(Next) of
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+
{ok, NQid} -> {NQid, State};
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+
{error, _} -> {false, State}
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+
end;
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walk(#{state := {Path, _}}, File, State) ->
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Next = filename:join(Path, File),
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case qid(Next) of