chardev: add tracing of socket error conditions
This adds trace points to every error scenario in the chardev socket
backend that can lead to termination of the connection.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
diff --git a/chardev/char-socket.c b/chardev/char-socket.c
index 812d7aa..1ca9441 100644
--- a/chardev/char-socket.c
+++ b/chardev/char-socket.c
@@ -33,6 +33,7 @@
#include "qapi/clone-visitor.h"
#include "qapi/qapi-visit-sockets.h"
#include "qemu/yank.h"
+#include "trace.h"
#include "chardev/char-io.h"
#include "chardev/char-socket.h"
@@ -126,6 +127,7 @@
if (ret < 0 && errno != EAGAIN) {
if (tcp_chr_read_poll(chr) <= 0) {
/* Perform disconnect and return error. */
+ trace_chr_socket_poll_err(chr, chr->label);
tcp_chr_disconnect_locked(chr);
} /* else let the read handler finish it properly */
}
@@ -279,15 +281,16 @@
size_t i;
int *msgfds = NULL;
size_t msgfds_num = 0;
+ Error *err = NULL;
if (qio_channel_has_feature(s->ioc, QIO_CHANNEL_FEATURE_FD_PASS)) {
ret = qio_channel_readv_full(s->ioc, &iov, 1,
&msgfds, &msgfds_num,
- 0, NULL);
+ 0, &err);
} else {
ret = qio_channel_readv_full(s->ioc, &iov, 1,
NULL, NULL,
- 0, NULL);
+ 0, &err);
}
if (msgfds_num) {
@@ -322,7 +325,11 @@
errno = EAGAIN;
ret = -1;
} else if (ret == -1) {
+ trace_chr_socket_recv_err(chr, chr->label, error_get_pretty(err));
+ error_free(err);
errno = EIO;
+ } else if (ret == 0) {
+ trace_chr_socket_recv_eof(chr, chr->label);
}
return ret;
@@ -463,6 +470,7 @@
SocketChardev *s = SOCKET_CHARDEV(chr);
bool emit_close = s->state == TCP_CHARDEV_STATE_CONNECTED;
+ trace_chr_socket_disconnect(chr, chr->label);
tcp_chr_free_connection(chr);
if (s->listener) {
@@ -521,6 +529,7 @@
void *opaque)
{
Chardev *chr = CHARDEV(opaque);
+ trace_chr_socket_hangup(chr, chr->label);
tcp_chr_disconnect(chr);
return G_SOURCE_REMOVE;
}
@@ -672,15 +681,18 @@
SocketChardev *s = user_data;
Chardev *chr = CHARDEV(s);
TCPChardevTelnetInit *init = s->telnet_init;
+ Error *err = NULL;
ssize_t ret;
assert(init);
- ret = qio_channel_write(ioc, init->buf, init->buflen, NULL);
+ ret = qio_channel_write(ioc, init->buf, init->buflen, &err);
if (ret < 0) {
if (ret == QIO_CHANNEL_ERR_BLOCK) {
ret = 0;
} else {
+ trace_chr_socket_write_err(chr, chr->label, error_get_pretty(err));
+ error_free(err);
tcp_chr_disconnect(chr);
goto end;
}
@@ -765,9 +777,9 @@
Error *err = NULL;
if (qio_task_propagate_error(task, &err)) {
- error_reportf_err(err,
- "websock handshake of character device %s failed: ",
- chr->label);
+ trace_chr_socket_ws_handshake_err(chr, chr->label,
+ error_get_pretty(err));
+ error_free(err);
tcp_chr_disconnect(chr);
} else {
if (s->do_telnetopt) {
@@ -805,9 +817,9 @@
Error *err = NULL;
if (qio_task_propagate_error(task, &err)) {
- error_reportf_err(err,
- "TLS handshake of character device %s failed: ",
- chr->label);
+ trace_chr_socket_tls_handshake_err(chr, chr->label,
+ error_get_pretty(err));
+ error_free(err);
tcp_chr_disconnect(chr);
} else {
if (s->is_websock) {
@@ -826,19 +838,22 @@
SocketChardev *s = SOCKET_CHARDEV(chr);
QIOChannelTLS *tioc;
gchar *name;
+ Error *err = NULL;
if (s->is_listen) {
tioc = qio_channel_tls_new_server(
s->ioc, s->tls_creds,
s->tls_authz,
- NULL);
+ &err);
} else {
tioc = qio_channel_tls_new_client(
s->ioc, s->tls_creds,
s->addr->u.inet.host,
- NULL);
+ &err);
}
if (tioc == NULL) {
+ trace_chr_socket_tls_init_err(chr, chr->label, error_get_pretty(err));
+ error_free(err);
tcp_chr_disconnect(chr);
return;
}
diff --git a/chardev/trace-events b/chardev/trace-events
index 027107b..7e97b8a 100644
--- a/chardev/trace-events
+++ b/chardev/trace-events
@@ -17,3 +17,13 @@
spice_vmc_unregister_interface(void *scd) "spice vmc unregistered interface %p"
spice_vmc_event(int event) "spice vmc event %d"
+# char-socket.c
+chr_socket_poll_err(void *chrdev, const char *label) "chardev socket poll error %p (%s)"
+chr_socket_recv_err(void *chrdev, const char *label, const char *err) "chardev socket recv error %p (%s): %s"
+chr_socket_recv_eof(void *chrdev, const char *label) "chardev socket recv end-of-file %p (%s)"
+chr_socket_write_err(void *chrdev, const char *label, const char *err) "chardev socket write error %p (%s): %s"
+chr_socket_disconnect(void *chrdev, const char *label) "chardev socket disconnect %p (%s)"
+chr_socket_hangup(void *chrdev, const char *label) "chardev socket hangup %p (%s)"
+chr_socket_ws_handshake_err(void *chrdev, const char *label, const char *err) "chardev socket websock handshake error %p (%s): %s"
+chr_socket_tls_handshake_err(void *chrdev, const char *label, const char *err) "chardev socket TLS handshake error %p (%s): %s"
+chr_socket_tls_init_err(void *chrdev, const char *label, const char *err) "chardev socket TLS init error %p (%s): %s"
