On Mon, Sep 26, 2022 at 09:50:40PM +0200, Laurent Vivier wrote: > Signed-off-by: Laurent Vivier <[email protected]> > Reviewed-by: Stefano Brivio <[email protected]> > --- > net/stream.c | 108 +++++++++++++++++++++++++++++++++++++++++++++--- > qapi/net.json | 2 +- > qemu-options.hx | 1 + > 3 files changed, 105 insertions(+), 6 deletions(-) > > diff --git a/net/stream.c b/net/stream.c > index 3fb899df5d2d..02967c284efc 100644 > --- a/net/stream.c > +++ b/net/stream.c > @@ -235,7 +235,7 @@ static NetStreamState > *net_stream_fd_init_stream(NetClientState *peer, > static void net_stream_accept(void *opaque) > { > NetStreamState *s = opaque; > - struct sockaddr_in saddr; > + struct sockaddr_storage saddr; > socklen_t len; > int fd; > > @@ -253,9 +253,27 @@ static void net_stream_accept(void *opaque) > s->fd = fd; > s->nc.link_down = false; > net_stream_connect(s); > - snprintf(s->nc.info_str, sizeof(s->nc.info_str), > - "connection from %s:%d", > - inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port)); > + switch (saddr.ss_family) { > + case AF_INET: { > + struct sockaddr_in *saddr_in = (struct sockaddr_in *)&saddr; > + > + snprintf(s->nc.info_str, sizeof(s->nc.info_str), > + "connection from %s:%d", > + inet_ntoa(saddr_in->sin_addr), ntohs(saddr_in->sin_port));
So, here you print the address from which the connection has come -
the remote address.
> + break;
> + }
> + case AF_UNIX: {
> + struct sockaddr_un saddr_un;
> +
> + len = sizeof(saddr_un);
> + getsockname(s->listen_fd, (struct sockaddr *)&saddr_un, &len);
> + snprintf(s->nc.info_str, sizeof(s->nc.info_str),
> + "connect from %s", saddr_un.sun_path);
Here you print the bound address - the local address. Does that make
sense? I mean, in almost every occasion the remote Unix socket will
be anonymous, so it probably doesn't make sense to display that, but
is the bound address actually a useful substitute?
Maybe it should just be "connect from Unix socket".
> + break;
> + }
> + default:
> + g_assert_not_reached();
> + }
> }
>
> static int net_stream_server_init(NetClientState *peer,
> @@ -295,6 +313,43 @@ static int net_stream_server_init(NetClientState *peer,
> }
> break;
> }
> + case SOCKET_ADDRESS_TYPE_UNIX: {
> + struct sockaddr_un saddr_un;
> +
> + ret = unlink(addr->u.q_unix.path);
> + if (ret < 0 && errno != ENOENT) {
> + error_setg_errno(errp, errno, "failed to unlink socket %s",
> + addr->u.q_unix.path);
> + return -1;
> + }
> +
> + saddr_un.sun_family = PF_UNIX;
> + ret = snprintf(saddr_un.sun_path, sizeof(saddr_un.sun_path), "%s",
> + addr->u.q_unix.path);
> + if (ret < 0 || ret >= sizeof(saddr_un.sun_path)) {
> + error_setg(errp, "UNIX socket path '%s' is too long",
> + addr->u.q_unix.path);
> + error_append_hint(errp, "Path must be less than %zu bytes\n",
> + sizeof(saddr_un.sun_path));
> + return -1;
> + }
Not necessarily in scope here, but I do wonder if we want a common
helper to convert the QAPI SocketAddress to a struct sockaddr, which
supports both inet and Unix - and one day IPv6, one hopes - with all
the appropriate error handling.
> +
> + fd = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
> + if (fd < 0) {
> + error_setg_errno(errp, errno, "can't create stream socket");
> + return -1;
> + }
> + qemu_socket_set_nonblock(fd);
> +
> + ret = bind(fd, (struct sockaddr *)&saddr_un, sizeof(saddr_un));
> + if (ret < 0) {
> + error_setg_errno(errp, errno, "can't create socket with path:
> %s",
> + saddr_un.sun_path);
> + closesocket(fd);
> + return -1;
> + }
> + break;
> + }
> case SOCKET_ADDRESS_TYPE_FD:
> fd = monitor_fd_param(monitor_cur(), addr->u.fd.str, errp);
> if (fd == -1) {
> @@ -380,6 +435,49 @@ static int net_stream_client_init(NetClientState *peer,
> ntohs(saddr_in.sin_port));
> break;
> }
> + case SOCKET_ADDRESS_TYPE_UNIX: {
> + struct sockaddr_un saddr_un;
> +
> + saddr_un.sun_family = PF_UNIX;
> + ret = snprintf(saddr_un.sun_path, sizeof(saddr_un.sun_path), "%s",
> + addr->u.q_unix.path);
> + if (ret < 0 || ret >= sizeof(saddr_un.sun_path)) {
> + error_setg(errp, "UNIX socket path '%s' is too long",
> + addr->u.q_unix.path);
> + error_append_hint(errp, "Path must be less than %zu bytes\n",
> + sizeof(saddr_un.sun_path));
> + return -1;
> + }
> +
> + fd = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
> + if (fd < 0) {
> + error_setg_errno(errp, errno, "can't create stream socket");
> + return -1;
> + }
> + qemu_socket_set_nonblock(fd);
> +
> + connected = 0;
> + for (;;) {
> + ret = connect(fd, (struct sockaddr *)&saddr_un,
> sizeof(saddr_un));
> + if (ret < 0) {
> + if (errno == EINTR || errno == EWOULDBLOCK) {
> + /* continue */
> + } else if (errno == EAGAIN ||
> + errno == EALREADY) {
> + break;
> + } else {
> + error_setg_errno(errp, errno, "can't connect socket");
> + closesocket(fd);
> + return -1;
> + }
> + } else {
> + connected = 1;
> + break;
> + }
> + }
> + info_str = g_strdup_printf(" connect to %s", saddr_un.sun_path);
> + break;
> + }
> case SOCKET_ADDRESS_TYPE_FD:
> fd = monitor_fd_param(monitor_cur(), addr->u.fd.str, errp);
> if (fd == -1) {
> @@ -395,7 +493,7 @@ static int net_stream_client_init(NetClientState *peer,
> info_str = g_strdup_printf("connect to fd %d", fd);
> break;
> default:
> - error_setg(errp, "only support inet or fd type");
> + error_setg(errp, "only support inet, unix or fd type");
> return -1;
> }
>
> diff --git a/qapi/net.json b/qapi/net.json
> index e02e8001a000..bb96701a49a7 100644
> --- a/qapi/net.json
> +++ b/qapi/net.json
> @@ -583,7 +583,7 @@
> # or connect to (server=false)
> # @server: create server socket (default: true)
> #
> -# Only SocketAddress types 'inet' and 'fd' are supported.
> +# Only SocketAddress types 'unix', 'inet' and 'fd' are supported.
> #
> # Since: 7.1
> ##
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 8c765f345da8..7a34022ac651 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -2735,6 +2735,7 @@ DEF("netdev", HAS_ARG, QEMU_OPTION_netdev,
> " configure a network backend to connect to another
> network\n"
> " using an UDP tunnel\n"
> "-netdev
> stream,id=str[,server=on|off],addr.type=inet,addr.host=host,addr.port=port\n"
> + "-netdev stream,id=str[,server=on|off],addr.type=unix,addr.path=path\n"
> "-netdev stream,id=str[,server=on|off],addr.type=fd,addr.str=h\n"
> " configure a network backend to connect to another
> network\n"
> " using a socket connection in stream mode.\n"
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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