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authorRaimo Niskanen <[email protected]>2018-01-26 15:25:23 +0100
committerRaimo Niskanen <[email protected]>2018-01-26 15:25:23 +0100
commit82e5a5df18e21e4220e51d89c666d1da70f12ec1 (patch)
tree3146899e82feceb480e762f32097e0d8d8684766 /lib/kernel
parent5b58d9e2d3262160b7f10d8b6798f89f0618c5f6 (diff)
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Implement function for IPv4-mapped IPv6 addresses
Diffstat (limited to 'lib/kernel')
-rw-r--r--lib/kernel/doc/src/inet.xml15
-rw-r--r--lib/kernel/src/inet.erl13
-rw-r--r--lib/kernel/test/inet_SUITE.erl25
3 files changed, 48 insertions, 5 deletions
diff --git a/lib/kernel/doc/src/inet.xml b/lib/kernel/doc/src/inet.xml
index abb045b744..5c56247820 100644
--- a/lib/kernel/doc/src/inet.xml
+++ b/lib/kernel/doc/src/inet.xml
@@ -4,7 +4,7 @@
<erlref>
<header>
<copyright>
- <year>1997</year><year>2017</year>
+ <year>1997</year><year>2018</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
@@ -582,6 +582,19 @@ get_tcpi_sacked(Sock) ->
</func>
<func>
+ <name name="ipv4_mapped_ipv6_address" arity="1" />
+ <fsummary>Convert to and from IPv4-mapped IPv6 address.</fsummary>
+ <desc>
+ <p>
+ Convert an IPv4 address to an IPv4-mapped IPv6 address
+ or the reverse. When converting from an IPv6 address
+ all but the 2 low words are ignored so this function also
+ works on some other types of addresses than IPv4-mapped.
+ </p>
+ </desc>
+ </func>
+
+ <func>
<name name="parse_strict_address" arity="1" />
<fsummary>Parse an IPv4 or IPv6 address strict.</fsummary>
<desc>
diff --git a/lib/kernel/src/inet.erl b/lib/kernel/src/inet.erl
index fe91b0d33e..fd26a88d42 100644
--- a/lib/kernel/src/inet.erl
+++ b/lib/kernel/src/inet.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1997-2017. All Rights Reserved.
+%% Copyright Ericsson AB 1997-2018. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
@@ -34,7 +34,8 @@
ip/1, stats/0, options/0,
pushf/3, popf/1, close/1, gethostname/0, gethostname/1,
parse_ipv4_address/1, parse_ipv6_address/1, parse_ipv4strict_address/1,
- parse_ipv6strict_address/1, parse_address/1, parse_strict_address/1, ntoa/1]).
+ parse_ipv6strict_address/1, parse_address/1, parse_strict_address/1,
+ ntoa/1, ipv4_mapped_ipv6_address/1]).
-export([connect_options/2, listen_options/2, udp_options/2, sctp_options/2]).
-export([udp_module/1, tcp_module/1, tcp_module/2, sctp_module/1]).
@@ -675,6 +676,14 @@ parse_address(Addr) ->
parse_strict_address(Addr) ->
inet_parse:strict_address(Addr).
+-spec ipv4_mapped_ipv6_address(ip_address()) -> ip_address().
+ipv4_mapped_ipv6_address({D1,D2,D3,D4})
+ when (D1 bor D2 bor D3 bor D4) < 256 ->
+ {0,0,0,0,0,16#ffff,(D1 bsl 8) bor D2,(D3 bsl 8) bor D4};
+ipv4_mapped_ipv6_address({D1,D2,D3,D4,D5,D6,D7,D8})
+ when (D1 bor D2 bor D3 bor D4 bor D5 bor D6 bor D7 bor D8) < 65536 ->
+ {D7 bsr 8,D7 band 255,D8 bsr 8,D8 band 255}.
+
%% Return a list of available options
options() ->
[
diff --git a/lib/kernel/test/inet_SUITE.erl b/lib/kernel/test/inet_SUITE.erl
index 3b502be8b8..77ac743a6e 100644
--- a/lib/kernel/test/inet_SUITE.erl
+++ b/lib/kernel/test/inet_SUITE.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1997-2017. All Rights Reserved.
+%% Copyright Ericsson AB 1997-2018. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
@@ -40,7 +40,8 @@
lookup_bad_search_option/1,
getif/1,
getif_ifr_name_overflow/1,getservbyname_overflow/1, getifaddrs/1,
- parse_strict_address/1, simple_netns/1, simple_netns_open/1,
+ parse_strict_address/1, ipv4_mapped_ipv6_address/1,
+ simple_netns/1, simple_netns_open/1,
simple_bind_to_device/1, simple_bind_to_device_open/1]).
-export([get_hosts/1, get_ipv6_hosts/1, parse_hosts/1, parse_address/1,
@@ -667,6 +668,26 @@ parse_strict_address(Config) when is_list(Config) ->
{ok, {3089,3106,23603,50240,0,0,119,136}} =
inet:parse_strict_address("c11:0c22:5c33:c440::077:0088").
+ipv4_mapped_ipv6_address(Config) when is_list(Config) ->
+ {D1,D2,D3,D4} = IPv4Address =
+ {rand:uniform(256) - 1,
+ rand:uniform(256) - 1,
+ rand:uniform(256) - 1,
+ rand:uniform(256) - 1},
+ E7 = (D1 bsl 8) bor D2,
+ E8 = (D3 bsl 8) bor D4,
+ io:format("IPv4Address: ~p.~n", [IPv4Address]),
+ {0,0,0,0,0,65535,E7,E8} = inet:ipv4_mapped_ipv6_address(IPv4Address),
+ IPv6Address =
+ {rand:uniform(65536) - 1,
+ rand:uniform(65536) - 1,
+ rand:uniform(65536) - 1,
+ rand:uniform(65536) - 1,
+ rand:uniform(65536) - 1,
+ rand:uniform(65536) - 1, E7, E8},
+ IPv4Address = inet:ipv4_mapped_ipv6_address(IPv6Address),
+ ok.
+
t_gethostnative(Config) when is_list(Config) ->
%% this will result in 26 bytes sent which causes problem in Windows
%% if the port-program has not assured stdin to be read in BINARY mode