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Revert "config: Make clients tell dual-stack exits they prefer IPv6"

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This reverts commit bf2a399fc0.

Don't set by default the prefer IPv6 feature on client ports because it breaks
the torsocks use case. The SOCKS resolve command is lacking a mechanism to ask
for a specific address family (v4 or v6) thus prioritizing IPv6 when an IPv4
address is asked on the resolve SOCKS interface resulting in a failure.

Tor Browser explicitly set PreferIPv6 so this should not affect the majority
of our users.

Closes #33796

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2020-07-07 12:05:27 -04:00
parent d4c79cae76
commit 66d5292ee6
4 changed files with 15 additions and 12 deletions
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7
changes/ticket33796 Normal file
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@ -0,0 +1,7 @@
o Removed features (IPv6, revert):
- Revert the client port prefer IPv6 feature because it breaks the
torsocks use case. The SOCKS resolve command is lacking a mechanism to
ask for a specific address family (v4 or v6) thus prioritizing IPv6 when
an IPv4 address is asked on the resolve SOCKS interface resulting in a
failure. Tor Browser explicitly set PreferIPv6 so this should not affect
the majority of our users. Closes ticket 33796; bugfix on 0.4.4.1-alpha.

16
doc/tor.1.txt
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@ -1492,16 +1492,14 @@ The following options are useful only for clients (that is, if
Other recognized __flags__ for a SocksPort are:
**NoIPv4Traffic**;;
Tell exits to not connect to IPv4 addresses in response to SOCKS
requests on this connection. (Allowing IPv4 is the default.)
**NoIPv6Traffic**;;
Tell exits to not connect to IPv6 addresses in response to SOCKS
requests on this connection. This option is only relevant when SOCKS5
is in use, because SOCKS4 can't handle IPv6. (Allowing IPv6 is the
default.)
**NoPreferIPv6**;;
requests on this connection.
**IPv6Traffic**;;
Tell exits to allow IPv6 addresses in response to SOCKS requests on
this connection, so long as SOCKS5 is in use. (SOCKS4 can't handle
IPv6.)
**PreferIPv6**;;
Tells exits that, if a host has both an IPv4 and an IPv6 address,
we would prefer to connect to it via IPv4. (IPv6 is the default in
recent versions of Tor.)
we would prefer to connect to it via IPv6. (IPv4 is the default.)
**NoDNSRequest**;;
Do not ask exits to resolve DNS addresses in SOCKS5 requests. Tor will
connect to IPv4 addresses, IPv6 addresses (if IPv6Traffic is set) and

2
src/app/config/config.c
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@ -5610,7 +5610,7 @@ port_cfg_new(size_t namelen)
/* entry_cfg flags */
cfg->entry_cfg.ipv4_traffic = 1;
cfg->entry_cfg.ipv6_traffic = 1;
cfg->entry_cfg.prefer_ipv6 = 1;
cfg->entry_cfg.prefer_ipv6 = 0;
cfg->entry_cfg.dns_request = 1;
cfg->entry_cfg.onion_traffic = 1;
cfg->entry_cfg.prefer_ipv6_virtaddr = 1;

2
src/test/test_config.c
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@ -4160,8 +4160,6 @@ test_config_parse_port_config__ports__ports_given(void *data)
/* Test entry port defaults as initialised in port_parse_config */
tt_int_op(port_cfg->entry_cfg.dns_request, OP_EQ, 1);
tt_int_op(port_cfg->entry_cfg.ipv4_traffic, OP_EQ, 1);
tt_int_op(port_cfg->entry_cfg.ipv6_traffic, OP_EQ, 1);
tt_int_op(port_cfg->entry_cfg.prefer_ipv6, OP_EQ, 1);
tt_int_op(port_cfg->entry_cfg.onion_traffic, OP_EQ, 1);
tt_int_op(port_cfg->entry_cfg.cache_ipv4_answers, OP_EQ, 0);
tt_int_op(port_cfg->entry_cfg.prefer_ipv6_virtaddr, OP_EQ, 1);