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When checking if a connection comes from localhost, don't assume it's an IPv4

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connection.  Instead, correctly check IPv4 and IPv6 connections, assume that
AF_LOCAL is always local, and anything else is always remote.

This makes trivial local-to-remote forwarding work on my system.

[originally from svn r5180]
This commit is contained in:
Ben Harris 2005-01-23 14:31:08 +00:00
parent 11bc6185ec
commit 15e7d71f39
1 changed files with 33 additions and 5 deletions
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38
unix/uxnet.c
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@ -948,6 +948,29 @@ static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
return s->sending_oob;
}
static int sockaddr_is_loopback(struct sockaddr *sa)
{
struct sockaddr_in *sin;
#ifndef NO_IPV6
struct sockaddr_in6 *sin6;
#endif
switch (sa->sa_family) {
case AF_INET:
sin = (struct sockaddr_in *)sa;
return ipv4_is_loopback(sin->sin_addr);
#ifndef NO_IPV6
case AF_INET6:
sin6 = (struct sockaddr_in6 *)sa;
return IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr);
#endif
case AF_LOCAL:
return TRUE;
default:
return FALSE;
}
}
static int net_select_result(int fd, int event)
{
int ret;
@ -1009,17 +1032,22 @@ static int net_select_result(int fd, int event)
* On a listening socket, the readability event means a
* connection is ready to be accepted.
*/
struct sockaddr_in isa;
int addrlen = sizeof(struct sockaddr_in);
#ifdef NO_IPV6
struct sockaddr_in ss;
#else
struct sockaddr_storage ss;
#endif
socklen_t addrlen = sizeof(ss);
int t; /* socket of connection */
memset(&isa, 0, sizeof(struct sockaddr_in));
t = accept(s->s,(struct sockaddr *)&isa,(socklen_t *) &addrlen);
memset(&ss, 0, addrlen);
t = accept(s->s, (struct sockaddr *)&ss, &addrlen);
if (t < 0) {
break;
}
if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) {
if (s->localhost_only &&
!sockaddr_is_loopback((struct sockaddr *)&ss)) {
close(t); /* someone let nonlocal through?! */
} else if (plug_accepting(s->plug, t)) {
close(t); /* denied or error */