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Make unix (local) sockets work without IPv6 enabled

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The xsocket_type() function had an optional "family" argument
that was enabled only if IPv6 is enabled. In the case of the
function was called with a valid AF_UNIX argument, and IPv6 is
disabled, this argument was silently ignored.

This patch makes the "family" argument mandatory, while keeping
the old behavior i.e., if AF_UNSPEC is passed, we try first IPv6
(if it's enabled) and fallback to IPv4.

Also I changed all callers of xsocket_type() to reflect its new
interface.

Signed-off-by: Jonh Wendell <jonh.wendell@vexcorp.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Jonh Wendell 2012-02-09 15:14:33 +01:00 committed by Denys Vlasenko
parent 638dbc34b3
commit 9106107a50
2 changed files with 9 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/libbb.h
View File

@ -568,12 +568,7 @@ enum {
* and if kernel doesn't support it, fall back to IPv4.
* This is useful if you plan to bind to resulting local lsa.
*/
#if ENABLE_FEATURE_IPV6
int xsocket_type(len_and_sockaddr **lsap, int af, int sock_type) FAST_FUNC;
#else
int xsocket_type(len_and_sockaddr **lsap, int sock_type) FAST_FUNC;
#define xsocket_type(lsap, af, sock_type) xsocket_type((lsap), (sock_type))
#endif
int xsocket_stream(len_and_sockaddr **lsap) FAST_FUNC;
/* Create server socket bound to bindaddr:port. bindaddr can be NULL,
* numeric IP ("N.N.N.N") or numeric IPv6 address,

16
libbb/xconnect.c
View File

@ -322,26 +322,28 @@ len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
}
#undef xsocket_type
int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, IF_FEATURE_IPV6(int family,) int sock_type)
int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, int family, int sock_type)
{
IF_NOT_FEATURE_IPV6(enum { family = AF_INET };)
len_and_sockaddr *lsa;
int fd;
int len;
#if ENABLE_FEATURE_IPV6
if (family == AF_UNSPEC) {
#if ENABLE_FEATURE_IPV6
fd = socket(AF_INET6, sock_type, 0);
if (fd >= 0) {
family = AF_INET6;
goto done;
}
#endif
family = AF_INET;
}
#endif
fd = xsocket(family, sock_type, 0);
len = sizeof(struct sockaddr_in);
if (family == AF_UNIX)
len = sizeof(struct sockaddr_un);
#if ENABLE_FEATURE_IPV6
if (family == AF_INET6) {
done:
@ -357,7 +359,7 @@ int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, IF_FEATURE_IPV6(int family,)
int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
{
return xsocket_type(lsap, IF_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
return xsocket_type(lsap, AF_UNSPEC, SOCK_STREAM);
}
static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
@ -370,7 +372,7 @@ static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
/* user specified bind addr dictates family */
fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
} else {
fd = xsocket_type(&lsa, IF_FEATURE_IPV6(AF_UNSPEC,) sock_type);
fd = xsocket_type(&lsa, AF_UNSPEC, sock_type);
set_nport(&lsa->u.sa, htons(port));
}
setsockopt_reuseaddr(fd);