Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
---
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 e8afbaca50b6..0f91ff20df61 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));
+ 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);
+ 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;
+ }
+
+ 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 bb16a61bae8e..8870bcce6bcd 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2733,6 +2733,7 @@ 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"
--
2.37.3On Tue, Sep 13, 2022 at 08:39:53AM +0200, Laurent Vivier wrote:
> Signed-off-by: Laurent Vivier <lvivier@redhat.com>
> Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
> ---
> 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 e8afbaca50b6..0f91ff20df61 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));
> + break;
> + }
> + case AF_UNIX: {
> + struct sockaddr_un saddr_un;
> +
> + len = sizeof(saddr_un);
> + getsockname(s->listen_fd, (struct sockaddr *)&saddr_un, &len);
It seems like there's an asymmetry here in that we've gotten the
connection address outside the switch for inet sockets, but we need an
additional getsockname() for unix sockets. Am I missing something?
> + snprintf(s->nc.info_str, sizeof(s->nc.info_str),
> + "connect from %s", saddr_un.sun_path);
> + 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;
> + }
> +
> + 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 bb16a61bae8e..8870bcce6bcd 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -2733,6 +2733,7 @@ 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
On 9/14/22 07:16, David Gibson wrote:
> On Tue, Sep 13, 2022 at 08:39:53AM +0200, Laurent Vivier wrote:
>> Signed-off-by: Laurent Vivier <lvivier@redhat.com>
>> Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
>> ---
>> 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 e8afbaca50b6..0f91ff20df61 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));
>> + break;
>> + }
>> + case AF_UNIX: {
>> + struct sockaddr_un saddr_un;
>> +
>> + len = sizeof(saddr_un);
>> + getsockname(s->listen_fd, (struct sockaddr *)&saddr_un, &len);
>
> It seems like there's an asymmetry here in that we've gotten the
> connection address outside the switch for inet sockets, but we need an
> additional getsockname() for unix sockets. Am I missing something?
>
This is because unix socket are not symmetric.
connect() returns the peer socket address.
With inet, server is waiting on, for instance, 127.0.0.1:1234 and peer address will appear
to be something like 127.0.0.1:33946. So info_str will be set with "127.0.0.1:33946".
In case of unix, server is waiting on, for instance, /tmp/qemu0 and there is no peer
address as the client connect to this same file. So the sun_path is empty when it returns
from accept(). So to set the path of the socket (sun_path) in info_str I use the
getsockname() to retrieve the server sun_path.
Thanks,
Laurent
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