[Spice-devel] [spice-server v2 1/7] test-vdagent: Pass proper types to spice_server_add_interface

[Christophe Fergeau]

This is a revert of 93b4f4050^ and 93b4f4050.
For a SpiceCharDeviceInstance, the base interface must be a
SpiceCharDeviceInterface instance, not a SpiceBaseInterface instance, or
spice-server code will end up reading out of bounds.

vmc_state/vmc_write/vmc_read implementations also have to be provided.
---
 server/tests/test-vdagent.c | 65 ++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 59 insertions(+), 6 deletions(-)

diff --git a/server/tests/test-vdagent.c b/server/tests/test-vdagent.c
index 7f905ad..e06229e 100644
--- a/server/tests/test-vdagent.c
+++ b/server/tests/test-vdagent.c
@@ -45,11 +45,64 @@ static void pinger(SPICE_GNUC_UNUSED void *opaque)
     core->timer_start(ping_timer, ping_ms);
 }
 
-static SpiceBaseInterface base = {
-    .type          = SPICE_INTERFACE_CHAR_DEVICE,
-    .description   = "test spice virtual channel char device",
-    .major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
-    .minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
+static int vmc_write(SPICE_GNUC_UNUSED SpiceCharDeviceInstance *sin,
+                     SPICE_GNUC_UNUSED const uint8_t *buf,
+                     int len)
+{
+    return len;
+}
+
+static int vmc_read(SPICE_GNUC_UNUSED SpiceCharDeviceInstance *sin,
+                    uint8_t *buf,
+                    int len)
+{
+    static uint8_t c = 0;
+    static uint8_t message[2048];
+    static unsigned pos = 0;
+    static unsigned message_size;
+    int ret;
+
+    if (pos == 0) {
+        VDIChunkHeader *hdr = (VDIChunkHeader *)message;
+        VDAgentMessage *msg = (VDAgentMessage *)&hdr[1];
+        uint8_t *p = message;
+        int size = sizeof(message);
+        message_size = size;
+        /* fill in message */
+        hdr->port = VDP_SERVER_PORT;
+        hdr->size = message_size - sizeof(VDIChunkHeader);
+        msg->protocol = VD_AGENT_PROTOCOL;
+        msg->type = VD_AGENT_END_MESSAGE;
+        msg->opaque = 0;
+        msg->size = message_size - sizeof(VDIChunkHeader) - sizeof(VDAgentMessage);
+        size -= sizeof(VDIChunkHeader) + sizeof(VDAgentMessage);
+        p += sizeof(VDIChunkHeader) + sizeof(VDAgentMessage);
+        for (; size; --size, ++p, ++c)
+            *p = c;
+    }
+    ret = MIN(message_size - pos, len);
+    memcpy(buf, &message[pos], ret);
+    pos += ret;
+    if (pos == message_size) {
+        pos = 0;
+    }
+    //printf("vmc_read %d (ret %d)\n", len, ret);
+    return ret;
+}
+
+static void vmc_state(SPICE_GNUC_UNUSED SpiceCharDeviceInstance *sin,
+                      SPICE_GNUC_UNUSED int connected)
+{
+}
+
+static SpiceCharDeviceInterface vmc_interface = {
+    .base.type          = SPICE_INTERFACE_CHAR_DEVICE,
+    .base.description   = "test spice virtual channel char device",
+    .base.major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
+    .base.minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
+    .state              = vmc_state,
+    .write              = vmc_write,
+    .read               = vmc_read,
 };
 
 SpiceCharDeviceInstance vmc_instance = {
@@ -63,7 +116,7 @@ int main(void)
     core = basic_event_loop_init();
     test = test_new(core);
 
-    vmc_instance.base.sif = &base;
+    vmc_instance.base.sif = &vmc_interface.base;
     spice_server_add_interface(test->server, &vmc_instance.base);
 
     ping_timer = core->timer_add(pinger, NULL);
-- 
2.9.3