[vdagent-linux v5 2/3] Do endian swapping.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Michal Suchanek <msuchanek@xxxxxxx>

This allows running big endian and little endian guest side by side using
cut & paste between them.

There is a general design idea that swapping should come as close to
virtio_read/virtio_write as possible. In particular, the protocol
between vdagent and vdagentd is guest-specific and in native endian.
With muliple layers of headers this is a bit tricky. A few message types
have to be swapped fully before passing through vdagentd.

Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx>
Signed-off-by: Victor Toso <victortoso@xxxxxxxxxx>
---
 src/vdagentd/vdagentd.c    | 125 +++++++++++++++++++++++++++++++++++----------
 src/vdagentd/virtio-port.c |  36 ++++++++-----
 2 files changed, 121 insertions(+), 40 deletions(-)

diff --git a/src/vdagentd/vdagentd.c b/src/vdagentd/vdagentd.c
index 4eb8e80..7ab8b2e 100644
--- a/src/vdagentd/vdagentd.c
+++ b/src/vdagentd/vdagentd.c
@@ -97,6 +97,34 @@ static gsize vdagent_message_min_size[VD_AGENT_END_MESSAGE] = {
 };
 
 /* utility functions */
+static void virtio_msg_uint32_to_le(uint8_t *_msg, uint32_t size, uint32_t offset)
+{
+    uint32_t i, *msg = (uint32_t *)(_msg + offset);
+
+    /* offset - size % 4 should be 0 */
+    for (i = 0; i < (size - offset) / 4; i++)
+        msg[i] = GUINT32_TO_LE(msg[i]);
+}
+
+static void virtio_msg_uint32_from_le(uint8_t *_msg, uint32_t size, uint32_t offset)
+{
+    uint32_t i, *msg = (uint32_t *)(_msg + offset);
+
+    /* offset - size % 4 should be 0 */
+    for (i = 0; i < (size - offset) / 4; i++)
+        msg[i] = GUINT32_FROM_LE(msg[i]);
+}
+
+static void virtio_msg_uint16_from_le(uint8_t *_msg, uint32_t size, uint32_t offset)
+{
+    uint32_t i;
+    uint16_t *msg = (uint16_t *)(_msg + offset);
+
+    /* offset - size % 2 should be 0 */
+    for (i = 0; i < (size - offset) / 2; i++)
+        msg[i] = GUINT16_FROM_LE(msg[i]);
+}
+
 /* vdagentd <-> spice-client communication handling */
 static void send_capabilities(struct vdagent_virtio_port *vport,
     uint32_t request)
@@ -121,6 +149,7 @@ static void send_capabilities(struct vdagent_virtio_port *vport,
     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_GUEST_LINEEND_LF);
     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_MAX_CLIPBOARD);
     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_AUDIO_VOLUME_SYNC);
+    virtio_msg_uint32_to_le((uint8_t *)caps, size, 0);
 
     vdagent_virtio_port_write(vport, VDP_CLIENT_PORT,
                               VD_AGENT_ANNOUNCE_CAPABILITIES, 0,
@@ -170,8 +199,8 @@ static void do_client_monitors(struct vdagent_virtio_port *vport, int port_nr,
                     (uint8_t *)mon_config, size);
 
     /* Acknowledge reception of monitors config to spice server / client */
-    reply.type  = VD_AGENT_MONITORS_CONFIG;
-    reply.error = VD_AGENT_SUCCESS;
+    reply.type  = GUINT32_TO_LE(VD_AGENT_MONITORS_CONFIG);
+    reply.error = GUINT32_TO_LE(VD_AGENT_SUCCESS);
     vdagent_virtio_port_write(vport, port_nr, VD_AGENT_REPLY, 0,
                               (uint8_t *)&reply, sizeof(reply));
 }
@@ -274,8 +303,8 @@ static void send_file_xfer_status(struct vdagent_virtio_port *vport,
                                   const char *msg, uint32_t id, uint32_t xfer_status)
 {
     VDAgentFileXferStatusMessage status = {
-        .id = id,
-        .result = xfer_status,
+        .id = GUINT32_TO_LE(id),
+        .result = GUINT32_TO_LE(xfer_status),
     };
     syslog(LOG_WARNING, msg, id);
     if (vport)
@@ -335,14 +364,56 @@ static void do_client_file_xfer(struct vdagent_virtio_port *vport,
     udscs_write(conn, msg_type, 0, 0, data, message_header->size);
 }
 
+static void vdagent_message_clipboard_from_le(VDAgentMessage *message_header,
+        uint8_t *data)
+{
+    gsize min_size = vdagent_message_min_size[message_header->type];
+    uint32_t *data_type = (uint32_t *) data;
+
+    if (VD_AGENT_HAS_CAPABILITY(capabilities, capabilities_size,
+                                VD_AGENT_CAP_CLIPBOARD_SELECTION)) {
+        min_size += 4;
+        data_type++;
+    }
+
+    switch (message_header->type) {
+    case VD_AGENT_CLIPBOARD_REQUEST:
+    case VD_AGENT_CLIPBOARD:
+        *data_type = GUINT32_FROM_LE(*data_type);
+        break;
+    case VD_AGENT_CLIPBOARD_GRAB:
+        virtio_msg_uint32_from_le(data, message_header->size, min_size);
+        break;
+    default:
+        g_warn_if_reached();
+    }
+}
+
+static void vdagent_message_file_xfer_from_le(VDAgentMessage *message_header,
+        uint8_t *data)
+{
+    uint32_t *id = (uint32_t *)data;
+    *id = GUINT32_FROM_LE(*id);
+    id++; /* status */
+
+    switch (message_header->type) {
+    case VD_AGENT_FILE_XFER_DATA: {
+       VDAgentFileXferDataMessage *msg = (VDAgentFileXferDataMessage *)data;
+       msg->size = GUINT64_FROM_LE(msg->size);
+       break;
+    }
+    case VD_AGENT_FILE_XFER_STATUS:
+       *id = GUINT32_FROM_LE(*id); /* status */
+       break;
+    }
+}
+
 static int virtio_port_read_complete(
         struct vdagent_virtio_port *vport,
         int port_nr,
         VDAgentMessage *message_header,
         uint8_t *data)
 {
-    uint32_t min_size = 0;
-
     if (message_header->protocol != VD_AGENT_PROTOCOL) {
         syslog(LOG_ERR, "message with wrong protocol version ignoring");
         return 0;
@@ -362,6 +433,7 @@ static int virtio_port_read_complete(
 
     switch (message_header->type) {
     case VD_AGENT_MOUSE_STATE:
+        virtio_msg_uint32_from_le(data, message_header->size, 0);
         vdagentd_uinput_do_mouse(&uinput, (VDAgentMouseState *)data);
         if (!uinput) {
             /* Try to re-open the tablet */
@@ -383,10 +455,12 @@ static int virtio_port_read_complete(
         }
         break;
     case VD_AGENT_MONITORS_CONFIG:
+        virtio_msg_uint32_from_le(data, message_header->size, 0);
         do_client_monitors(vport, port_nr, message_header,
                     (VDAgentMonitorsConfig *)data);
         break;
     case VD_AGENT_ANNOUNCE_CAPABILITIES:
+        virtio_msg_uint32_from_le(data, message_header->size, 0);
         do_client_capabilities(vport, message_header,
                         (VDAgentAnnounceCapabilities *)data);
         break;
@@ -394,23 +468,13 @@ static int virtio_port_read_complete(
     case VD_AGENT_CLIPBOARD_REQUEST:
     case VD_AGENT_CLIPBOARD:
     case VD_AGENT_CLIPBOARD_RELEASE:
-        switch (message_header->type) {
-        case VD_AGENT_CLIPBOARD_GRAB:
-            min_size = sizeof(VDAgentClipboardGrab); break;
-        case VD_AGENT_CLIPBOARD_REQUEST:
-            min_size = sizeof(VDAgentClipboardRequest); break;
-        case VD_AGENT_CLIPBOARD:
-            min_size = sizeof(VDAgentClipboard); break;
-        }
-        if (VD_AGENT_HAS_CAPABILITY(capabilities, capabilities_size,
-                                    VD_AGENT_CAP_CLIPBOARD_SELECTION)) {
-            min_size += 4;
-        }
+        vdagent_message_clipboard_from_le(message_header, data);
         do_client_clipboard(vport, message_header, data);
         break;
     case VD_AGENT_FILE_XFER_START:
     case VD_AGENT_FILE_XFER_STATUS:
     case VD_AGENT_FILE_XFER_DATA:
+        vdagent_message_file_xfer_from_le(message_header, data);
         do_client_file_xfer(vport, message_header, data);
         break;
     case VD_AGENT_CLIENT_DISCONNECTED:
@@ -419,14 +483,18 @@ static int virtio_port_read_complete(
         break;
     case VD_AGENT_MAX_CLIPBOARD: {
         VDAgentMaxClipboard *msg = (VDAgentMaxClipboard *)data;
-        syslog(LOG_DEBUG, "Set max clipboard: %d", msg->max);
-        max_clipboard = msg->max;
+        syslog(LOG_DEBUG, "Set max clipboard: %d", GUINT32_FROM_LE(msg->max));
+        max_clipboard = GUINT32_FROM_LE(msg->max);
         break;
     }
-    case VD_AGENT_AUDIO_VOLUME_SYNC:
-        do_client_volume_sync(vport, port_nr, message_header,
-                (VDAgentAudioVolumeSync *)data);
+    case VD_AGENT_AUDIO_VOLUME_SYNC: {
+        VDAgentAudioVolumeSync *vdata = (VDAgentAudioVolumeSync *)data;
+        virtio_msg_uint16_from_le((uint8_t *)vdata, message_header->size,
+            offsetof(VDAgentAudioVolumeSync, volume));
+
+        do_client_volume_sync(vport, port_nr, message_header, vdata);
         break;
+    }
     default:
         g_warn_if_reached();
     }
@@ -435,7 +503,7 @@ static int virtio_port_read_complete(
 }
 
 static void virtio_write_clipboard(uint8_t selection, uint32_t msg_type,
-    uint32_t data_type, const uint8_t *data, uint32_t data_size)
+    uint32_t data_type, uint8_t *data, uint32_t data_size)
 {
     uint32_t size = data_size;
 
@@ -456,15 +524,18 @@ static void virtio_write_clipboard(uint8_t selection, uint32_t msg_type,
         vdagent_virtio_port_write_append(virtio_port, sel, 4);
     }
     if (data_type != -1) {
+        data_type = GUINT32_TO_LE(data_type);
         vdagent_virtio_port_write_append(virtio_port, (uint8_t*)&data_type, 4);
     }
 
+    if (msg_type == VD_AGENT_CLIPBOARD_GRAB)
+        virtio_msg_uint32_to_le(data, data_size, 0);
     vdagent_virtio_port_write_append(virtio_port, data, data_size);
 }
 
 /* vdagentd <-> vdagent communication handling */
 static int do_agent_clipboard(struct udscs_connection *conn,
-        struct udscs_message_header *header, const uint8_t *data)
+        struct udscs_message_header *header, uint8_t *data)
 {
     uint8_t selection = header->arg1;
     uint32_t msg_type = 0, data_type = -1, size = header->size;
@@ -775,8 +846,8 @@ static void agent_read_complete(struct udscs_connection **connp,
         break;
     case VDAGENTD_FILE_XFER_STATUS:{
         VDAgentFileXferStatusMessage status;
-        status.id = header->arg1;
-        status.result = header->arg2;
+        status.id = GUINT32_TO_LE(header->arg1);
+        status.result = GUINT32_TO_LE(header->arg2);
         vdagent_virtio_port_write(virtio_port, VDP_CLIENT_PORT,
                                   VD_AGENT_FILE_XFER_STATUS, 0,
                                   (uint8_t *)&status, sizeof(status));
diff --git a/src/vdagentd/virtio-port.c b/src/vdagentd/virtio-port.c
index cedda4d..ef3de90 100644
--- a/src/vdagentd/virtio-port.c
+++ b/src/vdagentd/virtio-port.c
@@ -28,6 +28,7 @@
 #include <sys/select.h>
 #include <sys/socket.h>
 #include <sys/un.h>
+#include <glib.h>
 
 #include "virtio-port.h"
 
@@ -216,16 +217,16 @@ int vdagent_virtio_port_write_start(
         return -1;
     }
 
-    chunk_header.port = port_nr;
-    chunk_header.size = sizeof(message_header) + data_size;
+    chunk_header.port = GUINT32_TO_LE(port_nr);
+    chunk_header.size = GUINT32_TO_LE(sizeof(message_header) + data_size);
     memcpy(new_wbuf->buf + new_wbuf->write_pos, &chunk_header,
            sizeof(chunk_header));
     new_wbuf->write_pos += sizeof(chunk_header);
 
-    message_header.protocol = VD_AGENT_PROTOCOL;
-    message_header.type = message_type;
-    message_header.opaque = message_opaque;
-    message_header.size = data_size;
+    message_header.protocol = GUINT32_TO_LE(VD_AGENT_PROTOCOL);
+    message_header.type = GUINT32_TO_LE(message_type);
+    message_header.opaque = GUINT64_TO_LE(message_opaque);
+    message_header.size = GUINT32_TO_LE(data_size);
     memcpy(new_wbuf->buf + new_wbuf->write_pos, &message_header,
            sizeof(message_header));
     new_wbuf->write_pos += sizeof(message_header);
@@ -309,13 +310,20 @@ static void vdagent_virtio_port_do_chunk(struct vdagent_virtio_port **vportp)
         memcpy((uint8_t *)&port->message_header + port->message_header_read,
                vport->chunk_data, read);
         port->message_header_read += read;
-        if (port->message_header_read == sizeof(port->message_header) &&
-                port->message_header.size) {
-            port->message_data = malloc(port->message_header.size);
-            if (!port->message_data) {
-                syslog(LOG_ERR, "out of memory, disconnecting virtio");
-                vdagent_virtio_port_destroy(vportp);
-                return;
+        if (port->message_header_read == sizeof(port->message_header)) {
+
+            port->message_header.protocol = GUINT32_FROM_LE(port->message_header.protocol);
+            port->message_header.type = GUINT32_FROM_LE(port->message_header.type);
+            port->message_header.opaque = GUINT64_FROM_LE(port->message_header.opaque);
+            port->message_header.size = GUINT32_FROM_LE(port->message_header.size);
+
+            if (port->message_header.size) {
+                port->message_data = malloc(port->message_header.size);
+                if (!port->message_data) {
+                    syslog(LOG_ERR, "out of memory, disconnecting virtio");
+                    vdagent_virtio_port_destroy(vportp);
+                    return;
+                }
             }
         }
         pos = read;
@@ -420,6 +428,8 @@ static void vdagent_virtio_port_do_read(struct vdagent_virtio_port **vportp)
     if (vport->chunk_header_read < sizeof(vport->chunk_header)) {
         vport->chunk_header_read += n;
         if (vport->chunk_header_read == sizeof(vport->chunk_header)) {
+            vport->chunk_header.size = GUINT32_FROM_LE(vport->chunk_header.size);
+            vport->chunk_header.port = GUINT32_FROM_LE(vport->chunk_header.port);
             if (vport->chunk_header.size > VD_AGENT_MAX_DATA_SIZE) {
                 syslog(LOG_ERR, "chunk size %u too large",
                        vport->chunk_header.size);
-- 
2.9.3

_______________________________________________
Spice-devel mailing list
Spice-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/spice-devel




[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Security]     [Bugtraq]     [Linux]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]     [Monitors]