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udev-ctrl: fix strict aliasing issues

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it is ironic that
"The only purpose of this structure is to cast the structure pointer
passed in addr in order to avoid compiler warnings.  See EXAMPLE below."
from bind(2)

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
This commit is contained in:
Shawn Landden 2015-03-10 21:01:47 -07:00 committed by Anthony G. Basile
parent 8c6168fcba
commit 3a864f5e04
1 changed files with 10 additions and 9 deletions
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19
src/udev/udev-ctrl.c
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@ -21,6 +21,7 @@
#include <sys/socket.h>
#include <sys/un.h>
#include "socket-util.h"
#include "udev.h"
/* wire protocol magic must match */
@ -58,7 +59,7 @@ struct udev_ctrl {
int refcount;
struct udev *udev;
int sock;
struct sockaddr_un saddr;
union sockaddr_union saddr;
socklen_t addrlen;
bool bound;
bool cleanup_socket;
@ -97,9 +98,9 @@ struct udev_ctrl *udev_ctrl_new_from_fd(struct udev *udev, int fd) {
if (r < 0)
log_warning_errno(errno, "could not set SO_PASSCRED: %m");
uctrl->saddr.sun_family = AF_LOCAL;
strscpy(uctrl->saddr.sun_path, sizeof(uctrl->saddr.sun_path), "/run/udev/control");
uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.sun_path);
uctrl->saddr.un.sun_family = AF_LOCAL;
strscpy(uctrl->saddr.un.sun_path, sizeof(uctrl->saddr.un.sun_path), "/run/udev/control");
uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.un.sun_path);
return uctrl;
}
@ -111,10 +112,10 @@ int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl) {
int err;
if (!uctrl->bound) {
err = bind(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
err = bind(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen);
if (err < 0 && errno == EADDRINUSE) {
unlink(uctrl->saddr.sun_path);
err = bind(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
unlink(uctrl->saddr.un.sun_path);
err = bind(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen);
}
if (err < 0) {
@ -163,7 +164,7 @@ int udev_ctrl_cleanup(struct udev_ctrl *uctrl) {
if (uctrl == NULL)
return 0;
if (uctrl->cleanup_socket)
unlink(uctrl->saddr.sun_path);
unlink(uctrl->saddr.un.sun_path);
return 0;
}
@ -273,7 +274,7 @@ static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int
ctrl_msg_wire.intval = intval;
if (!uctrl->connected) {
if (connect(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen) < 0) {
if (connect(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen) < 0) {
err = -errno;
goto out;
}