aboutsummaryrefslogtreecommitdiffstats
path: root/lib/kernel/src
diff options
context:
space:
mode:
Diffstat (limited to 'lib/kernel/src')
-rw-r--r--lib/kernel/src/inet.erl39
-rw-r--r--lib/kernel/src/inet_db.erl64
-rw-r--r--lib/kernel/src/inet_hosts.erl9
-rw-r--r--lib/kernel/src/inet_res.erl4
4 files changed, 69 insertions, 47 deletions
diff --git a/lib/kernel/src/inet.erl b/lib/kernel/src/inet.erl
index 1a1f7b8cbc..6f65968fc2 100644
--- a/lib/kernel/src/inet.erl
+++ b/lib/kernel/src/inet.erl
@@ -947,21 +947,34 @@ gethostbyname_self(Name, Type) when is_atom(Name) ->
gethostbyname_self(Name, Type)
when is_list(Name), Type =:= inet;
is_list(Name), Type =:= inet6 ->
- case inet_db:gethostname() of
- Name ->
- {ok,make_hostent(Name,
- [translate_ip(loopback, Type)],
- [], Type)};
- Self ->
+ N = inet_db:tolower(Name),
+ Self = inet_db:gethostname(),
+ %%
+ %% This is the final fallback that pretends /etc/hosts has got
+ %% a line for the hostname on the loopback address.
+ %% Lookups into /etc/hosts are case insensitive and return
+ %% what is in the file. Therefore the letter case may differ between
+ %% the returned hostent record and the hostname that was asked for.
+ %%
+ case inet_db:tolower(Self) of
+ N ->
+ {ok,
+ make_hostent(
+ Self, [translate_ip(loopback, Type)], [], Type)};
+ _ ->
case inet_db:res_option(domain) of
- "" -> {error,nxdomain};
+ "" ->
+ {error,nxdomain};
Domain ->
- case lists:append([Self,".",Domain]) of
- Name ->
- {ok,make_hostent(Name,
- [translate_ip(loopback, Type)],
- [], Type)};
- _ -> {error,nxdomain}
+ FQDN = lists:append([Self,".",Domain]),
+ case inet_db:tolower(FQDN) of
+ N ->
+ {ok,
+ make_hostent(
+ FQDN,
+ [translate_ip(loopback, Type)], [], Type)};
+ _ ->
+ {error,nxdomain}
end
end
end;
diff --git a/lib/kernel/src/inet_db.erl b/lib/kernel/src/inet_db.erl
index 8a2994579b..2ebdc0f554 100644
--- a/lib/kernel/src/inet_db.erl
+++ b/lib/kernel/src/inet_db.erl
@@ -845,7 +845,8 @@ init([]) ->
process_flag(trap_exit, true),
Db = ets:new(inet_db, [public, named_table]),
reset_db(Db),
- Cache = ets:new(inet_cache, [public, bag, {keypos,2}, named_table]),
+ CacheOpts = [public, bag, {keypos,#dns_rr.domain}, named_table],
+ Cache = ets:new(inet_cache, CacheOpts),
BynameOpts = [protected, bag, named_table, {keypos,1}],
ByaddrOpts = [protected, bag, named_table, {keypos,3}],
HostsByname = ets:new(inet_hosts_byname, BynameOpts),
@@ -901,15 +902,21 @@ reset_db(Db) ->
handle_call(Request, From, #state{db=Db}=State) ->
case Request of
{load_hosts_file,IPNmAs} when is_list(IPNmAs) ->
- NIPs = lists:flatten([ [{N,if tuple_size(IP) =:= 4 -> inet;
- tuple_size(IP) =:= 8 -> inet6
- end,IP} || N <- [Nm|As]]
- || {IP,Nm,As} <- IPNmAs]),
+ NIPs =
+ lists:flatten(
+ [ [{N,
+ if tuple_size(IP) =:= 4 -> inet;
+ tuple_size(IP) =:= 8 -> inet6
+ end,IP} || N <- [Nm|As]]
+ || {IP,Nm,As} <- IPNmAs]),
Byname = State#state.hosts_file_byname,
Byaddr = State#state.hosts_file_byaddr,
ets:delete_all_objects(Byname),
ets:delete_all_objects(Byaddr),
- ets:insert(Byname, NIPs),
+ %% Byname has lowercased names while Byaddr keep the name casing.
+ %% This is to be able to reconstruct the original
+ %% /etc/hosts entry.
+ ets:insert(Byname, [{tolower(N),Type,IP} || {N,Type,IP} <- NIPs]),
ets:insert(Byaddr, NIPs),
{reply, ok, State};
@@ -938,16 +945,14 @@ handle_call(Request, From, #state{db=Db}=State) ->
{reply, ok, State};
{add_rr, RR} when is_record(RR, dns_rr) ->
- RR1 = lower_rr(RR),
- ?dbg("add_rr: ~p~n", [RR1]),
- do_add_rr(RR1, Db, State),
+ ?dbg("add_rr: ~p~n", [RR]),
+ do_add_rr(RR, Db, State),
{reply, ok, State};
{del_rr, RR} when is_record(RR, dns_rr) ->
- RR1 = lower_rr(RR),
%% note. del_rr will handle wildcards !!!
Cache = State#state.cache,
- ets:match_delete(Cache, RR1),
+ ets:match_delete(Cache, RR),
{reply, ok, State};
{lookup_rr, Domain, Class, Type} ->
@@ -1225,15 +1230,19 @@ handle_set_file(ParseFun, Bin, From, State) ->
handle_rc_list(Opts, From, State)
end.
+%% Byname has lowercased names while Byaddr keep the name casing.
+%% This is to be able to reconstruct the original /etc/hosts entry.
+
do_add_host(Byname, Byaddr, Names, Type, IP) ->
do_del_host(Byname, Byaddr, IP),
- NIPs = [{tolower(N),Type,IP} || N <- Names],
- ets:insert(Byname, NIPs),
- ets:insert(Byaddr, NIPs),
+ ets:insert(Byname, [{tolower(N),Type,IP} || N <- Names]),
+ ets:insert(Byaddr, [{N,Type,IP} || N <- Names]),
ok.
do_del_host(Byname, Byaddr, IP) ->
- _ = [ets:delete_object(Byname, NIP) || NIP <- ets:lookup(Byaddr, IP)],
+ _ =
+ [ets:delete_object(Byname, {tolower(Name),Type,Addr}) ||
+ {Name,Type,Addr} <- ets:lookup(Byaddr, IP)],
ets:delete(Byaddr, IP),
ok.
@@ -1369,7 +1378,7 @@ times() ->
%% lookup and remove old entries
do_lookup_rr(Domain, Class, Type) ->
- match_rr(#dns_rr{domain = tolower(Domain), class = Class,type = Type,
+ match_rr(#dns_rr{domain = Domain, class = Class,type = Type,
cnt = '_', tm = '_', ttl = '_',
bm = '_', func = '_', data = '_'}).
@@ -1393,23 +1402,20 @@ filter_rr([], _Time) -> [].
%%
-%% Lower case the domain name before storage
-%%
-lower_rr(RR) ->
- Dn = RR#dns_rr.domain,
- if is_list(Dn) ->
- RR#dns_rr { domain = tolower(Dn) };
- true -> RR
- end.
-
+%% Case fold upper-case to lower-case according to RFC 4343
+%% "Domain Name System (DNS) Case Insensitivity Clarification".
%%
-%% Map upper-case to lower-case
%% NOTE: this code is in kernel and we don't want to relay
-%% to much on stdlib
+%% to much on stdlib. Furthermore string:to_lower/1
+%% does not follow RFC 4343.
%%
tolower([]) -> [];
-tolower([C|Cs]) when C >= $A, C =< $Z -> [(C-$A)+$a|tolower(Cs)];
-tolower([C|Cs]) -> [C|tolower(Cs)].
+tolower([C|Cs]) when is_integer(C) ->
+ if C >= $A, C =< $Z ->
+ [(C-$A)+$a|tolower(Cs)];
+ true ->
+ [C|tolower(Cs)]
+ end.
dn_ip6_int(A,B,C,D,E,F,G,H) ->
dnib(H) ++ dnib(G) ++ dnib(F) ++ dnib(E) ++
diff --git a/lib/kernel/src/inet_hosts.erl b/lib/kernel/src/inet_hosts.erl
index df1d4fc0be..6e9719b4aa 100644
--- a/lib/kernel/src/inet_hosts.erl
+++ b/lib/kernel/src/inet_hosts.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1997-2009. All Rights Reserved.
+%% Copyright Ericsson AB 1997-2013. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -38,9 +38,12 @@ gethostbyname(_) -> {error, formerr}.
gethostbyname(Name, Type) when is_list(Name), is_atom(Type) ->
- case gethostbyname(Name, Type, inet_hosts_byname, inet_hosts_byaddr) of
+ %% Byname has lowercased names while Byaddr keep the name casing.
+ %% This is to be able to reconstruct the original /etc/hosts entry.
+ N = inet_db:tolower(Name),
+ case gethostbyname(N, Type, inet_hosts_byname, inet_hosts_byaddr) of
false ->
- case gethostbyname(Name, Type,
+ case gethostbyname(N, Type,
inet_hosts_file_byname,
inet_hosts_file_byaddr) of
false -> {error,nxdomain};
diff --git a/lib/kernel/src/inet_res.erl b/lib/kernel/src/inet_res.erl
index ab9cbf0617..6037da1d22 100644
--- a/lib/kernel/src/inet_res.erl
+++ b/lib/kernel/src/inet_res.erl
@@ -181,8 +181,8 @@ lookup(Name, Class, Type, Opts, Timeout) ->
lookup_filter({ok,#dns_rec{anlist=Answers}}, Class, Type) ->
[A#dns_rr.data || A <- Answers,
- A#dns_rr.class =:= Class,
- A#dns_rr.type =:= Type];
+ Class =:= any orelse A#dns_rr.class =:= Class,
+ Type =:= any orelse A#dns_rr.type =:= Type];
lookup_filter({error,_}, _, _) -> [].
%% --------------------------------------------------------------------------
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-21 14:19:43 +0000