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s3:lib/util_sock: listen on IPv6 addresses with IPV6_ONLY (bug #7383)

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This avoids getting IPv4 addresses as mapped IPv6 addresses
(e.g. ::ffff:192.168.0.1).

Before the bahavior was inconsistent between operating system
and distributions. Some system have IPV6_ONLY as default.

Now we consistently get AF_INET for IPv4 addresses and AF_INET6
for IPv6 addresses.

It also makes it possible to listen only on IPv6 now
as "::" doesn't imply "0.0.0.0" anymore. Which also
avoids confusing log messages that we were not able to
bind to "0.0.0.0".

metze
This commit is contained in:
Stefan Metzmacher 2011-04-23 11:29:51 +02:00
parent 4bfe2d5655
commit a3a38ee90a
1 changed files with 26 additions and 0 deletions
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26
source3/lib/util_sock.c
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@ -787,6 +787,32 @@ int open_socket_in(int type,
#endif /* SO_REUSEPORT */
}
#ifdef HAVE_IPV6
/*
* As IPV6_V6ONLY is the default on some systems,
* we better try to be consistent and always use it.
*
* This also avoids using IPv4 via AF_INET6 sockets
* and makes sure %I never resolves to a '::ffff:192.168.0.1'
* string.
*/
if (sock.ss_family == AF_INET6) {
int val = 1;
int ret;
ret = setsockopt(res, IPPROTO_IPV6, IPV6_V6ONLY,
(const void *)&val, sizeof(val));
if (ret == -1) {
if(DEBUGLVL(0)) {
dbgtext("open_socket_in(): IPV6_ONLY failed: ");
dbgtext("%s\n", strerror(errno));
}
close(res);
return -1;
}
}
#endif
/* now we've got a socket - we need to bind it */
if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||