diff mbox

[3/3] socket: unlink unix socket on remove

Message ID 1466075835-28494-4-git-send-email-marcandre.lureau@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Marc-André Lureau June 16, 2016, 11:17 a.m. UTC 
From: Marc-André Lureau <marcandre.lureau@redhat.com>

qemu leaves unix socket files behind when removing a listening chardev
or leaving. qemu could clean that up, even if doing so isn't race-free.

Fixes:
https://bugzilla.redhat.com/show_bug.cgi?id=1347077

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 include/qemu/sockets.h         |  1 +
 io/channel-socket.c            | 10 ++++++++++
 tests/test-io-channel-socket.c |  2 +-
 util/qemu-sockets.c            | 18 ++++++++++++++++++
 4 files changed, 30 insertions(+), 1 deletion(-)

Comments

Paolo Bonzini June 16, 2016, 12:28 p.m. UTC | #1 
On 16/06/2016 13:17, marcandre.lureau@redhat.com wrote:
> From: Marc-André Lureau <marcandre.lureau@redhat.com>
> 
> qemu leaves unix socket files behind when removing a listening chardev
> or leaving. qemu could clean that up, even if doing so isn't race-free.
> 
> Fixes:
> https://bugzilla.redhat.com/show_bug.cgi?id=1347077
> 
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> ---
>  include/qemu/sockets.h         |  1 +
>  io/channel-socket.c            | 10 ++++++++++
>  tests/test-io-channel-socket.c |  2 +-
>  util/qemu-sockets.c            | 18 ++++++++++++++++++
>  4 files changed, 30 insertions(+), 1 deletion(-)
> 
> diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h
> index 1bd9218..5dd2648 100644
> --- a/include/qemu/sockets.h
> +++ b/include/qemu/sockets.h
> @@ -51,6 +51,7 @@ SocketAddress *socket_parse(const char *str, Error **errp);
>  int socket_connect(SocketAddress *addr, Error **errp,
>                     NonBlockingConnectHandler *callback, void *opaque);
>  int socket_listen(SocketAddress *addr, Error **errp);
> +void socket_listen_cleanup(int fd, Error **errp);
>  int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp);
>  
>  /* Old, ipv4 only bits.  Don't use for new code. */
> diff --git a/io/channel-socket.c b/io/channel-socket.c
> index 1cd5848..319e1ab 100644
> --- a/io/channel-socket.c
> +++ b/io/channel-socket.c
> @@ -400,7 +400,17 @@ static void qio_channel_socket_init(Object *obj)
>  static void qio_channel_socket_finalize(Object *obj)
>  {
>      QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(obj);
> +
>      if (ioc->fd != -1) {
> +        Error *err = NULL;
> +
> +        if (QIO_CHANNEL(ioc)->features & QIO_CHANNEL_FEATURE_LISTEN)
> +            socket_listen_cleanup(ioc->fd, &err);

Every time you forget braces, checkpatch.pl kills a kitten!  Think of
the kittens!

Paolo

> +
> +        if (err) {
> +            error_report_err(err);
> +            err = NULL;
> +        }
>  #ifdef WIN32
>          WSAEventSelect(ioc->fd, NULL, 0);
>  #endif
> diff --git a/tests/test-io-channel-socket.c b/tests/test-io-channel-socket.c
> index 855306b..f73e063 100644
> --- a/tests/test-io-channel-socket.c
> +++ b/tests/test-io-channel-socket.c
> @@ -383,7 +383,7 @@ static void test_io_channel_unix(bool async)
>  
>      qapi_free_SocketAddress(listen_addr);
>      qapi_free_SocketAddress(connect_addr);
> -    unlink(TEST_SOCKET);
> +    g_assert(g_file_test(TEST_SOCKET, G_FILE_TEST_EXISTS) == FALSE);
>  }
>  
>  
> diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
> index 0d6cd1f..5d03695 100644
> --- a/util/qemu-sockets.c
> +++ b/util/qemu-sockets.c
> @@ -997,6 +997,24 @@ int socket_listen(SocketAddress *addr, Error **errp)
>      return fd;
>  }
>  
> +void socket_listen_cleanup(int fd, Error **errp)
> +{
> +    SocketAddress *addr;
> +
> +    addr = socket_local_address(fd, errp);
> +
> +    if (addr->type == SOCKET_ADDRESS_KIND_UNIX
> +        && addr->u.q_unix.data->path) {
> +        if (unlink(addr->u.q_unix.data->path) < 0 && errno != ENOENT) {
> +            error_setg_errno(errp, errno,
> +                             "Failed to unlink socket %s",
> +                             addr->u.q_unix.data->path);
> +        }
> +    }
> +
> +    g_free(addr);
> +}
> +
>  int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
>  {
>      int fd;
>
Marc-André Lureau June 16, 2016, 12:36 p.m. UTC | #2 
Hi

----- Original Message -----
> 
> 
> On 16/06/2016 13:17, marcandre.lureau@redhat.com wrote:
> > From: Marc-André Lureau <marcandre.lureau@redhat.com>
> > 
> > qemu leaves unix socket files behind when removing a listening chardev
> > or leaving. qemu could clean that up, even if doing so isn't race-free.
> > 
> > Fixes:
> > https://bugzilla.redhat.com/show_bug.cgi?id=1347077
> > 
> > Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> > ---
> >  include/qemu/sockets.h         |  1 +
> >  io/channel-socket.c            | 10 ++++++++++
> >  tests/test-io-channel-socket.c |  2 +-
> >  util/qemu-sockets.c            | 18 ++++++++++++++++++
> >  4 files changed, 30 insertions(+), 1 deletion(-)
> > 
> > diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h
> > index 1bd9218..5dd2648 100644
> > --- a/include/qemu/sockets.h
> > +++ b/include/qemu/sockets.h
> > @@ -51,6 +51,7 @@ SocketAddress *socket_parse(const char *str, Error
> > **errp);
> >  int socket_connect(SocketAddress *addr, Error **errp,
> >                     NonBlockingConnectHandler *callback, void *opaque);
> >  int socket_listen(SocketAddress *addr, Error **errp);
> > +void socket_listen_cleanup(int fd, Error **errp);
> >  int socket_dgram(SocketAddress *remote, SocketAddress *local, Error
> >  **errp);
> >  
> >  /* Old, ipv4 only bits.  Don't use for new code. */
> > diff --git a/io/channel-socket.c b/io/channel-socket.c
> > index 1cd5848..319e1ab 100644
> > --- a/io/channel-socket.c
> > +++ b/io/channel-socket.c
> > @@ -400,7 +400,17 @@ static void qio_channel_socket_init(Object *obj)
> >  static void qio_channel_socket_finalize(Object *obj)
> >  {
> >      QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(obj);
> > +
> >      if (ioc->fd != -1) {
> > +        Error *err = NULL;
> > +
> > +        if (QIO_CHANNEL(ioc)->features & QIO_CHANNEL_FEATURE_LISTEN)
> > +            socket_listen_cleanup(ioc->fd, &err);
> 
> Every time you forget braces, checkpatch.pl kills a kitten!  Think of
> the kittens!

Oh no! :) (weird the git hook usually catch this for me), fixed
diff mbox

Patch

diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h
index 1bd9218..5dd2648 100644
--- a/include/qemu/sockets.h
+++ b/include/qemu/sockets.h
@@ -51,6 +51,7 @@  SocketAddress *socket_parse(const char *str, Error **errp);
 int socket_connect(SocketAddress *addr, Error **errp,
                    NonBlockingConnectHandler *callback, void *opaque);
 int socket_listen(SocketAddress *addr, Error **errp);
+void socket_listen_cleanup(int fd, Error **errp);
 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp);
 
 /* Old, ipv4 only bits.  Don't use for new code. */
diff --git a/io/channel-socket.c b/io/channel-socket.c
index 1cd5848..319e1ab 100644
--- a/io/channel-socket.c
+++ b/io/channel-socket.c
@@ -400,7 +400,17 @@  static void qio_channel_socket_init(Object *obj)
 static void qio_channel_socket_finalize(Object *obj)
 {
     QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(obj);
+
     if (ioc->fd != -1) {
+        Error *err = NULL;
+
+        if (QIO_CHANNEL(ioc)->features & QIO_CHANNEL_FEATURE_LISTEN)
+            socket_listen_cleanup(ioc->fd, &err);
+
+        if (err) {
+            error_report_err(err);
+            err = NULL;
+        }
 #ifdef WIN32
         WSAEventSelect(ioc->fd, NULL, 0);
 #endif
diff --git a/tests/test-io-channel-socket.c b/tests/test-io-channel-socket.c
index 855306b..f73e063 100644
--- a/tests/test-io-channel-socket.c
+++ b/tests/test-io-channel-socket.c
@@ -383,7 +383,7 @@  static void test_io_channel_unix(bool async)
 
     qapi_free_SocketAddress(listen_addr);
     qapi_free_SocketAddress(connect_addr);
-    unlink(TEST_SOCKET);
+    g_assert(g_file_test(TEST_SOCKET, G_FILE_TEST_EXISTS) == FALSE);
 }
 
 
diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index 0d6cd1f..5d03695 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -997,6 +997,24 @@  int socket_listen(SocketAddress *addr, Error **errp)
     return fd;
 }
 
+void socket_listen_cleanup(int fd, Error **errp)
+{
+    SocketAddress *addr;
+
+    addr = socket_local_address(fd, errp);
+
+    if (addr->type == SOCKET_ADDRESS_KIND_UNIX
+        && addr->u.q_unix.data->path) {
+        if (unlink(addr->u.q_unix.data->path) < 0 && errno != ENOENT) {
+            error_setg_errno(errp, errno,
+                             "Failed to unlink socket %s",
+                             addr->u.q_unix.data->path);
+        }
+    }
+
+    g_free(addr);
+}
+
 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
 {
     int fd;