From patchwork Mon Jul 22 13:16:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= X-Patchwork-Id: 13738837 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6A6DAC3DA59 for ; Mon, 22 Jul 2024 13:17:47 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sVsuX-0000Jg-S7; Mon, 22 Jul 2024 09:17:05 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sVsuN-0008Vy-BB for qemu-devel@nongnu.org; Mon, 22 Jul 2024 09:16:57 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sVsuL-0007e6-81 for qemu-devel@nongnu.org; Mon, 22 Jul 2024 09:16:54 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1721654212; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=guRvBffAhsbbUjQ1k/UDvhEJy6iEFeJUVzuqZZ2Mzgc=; b=Uzxw3HqePtHbYZow7HqLWIp2NUC1dbW+xoYj/frIz0v1Aqg6WIF8JYLFfVsLf1AUWYuoZG 5f5PxvUKJgWYYgDfZQtEsxG5L7wh8A+bQ5MwAsJwrrRWrIbr5gHeo+S4sxbdS2alwfrzKL GKDSSJW9hEFw45FrTRkFiovJZ9tFyKc= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-214-PrC1fhuMPn2I_apZDkZREg-1; Mon, 22 Jul 2024 09:16:48 -0400 X-MC-Unique: PrC1fhuMPn2I_apZDkZREg-1 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 6EA761915334; Mon, 22 Jul 2024 13:16:41 +0000 (UTC) Received: from toolbox.redhat.com (unknown [10.42.28.102]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 3DB6D196B09E; Mon, 22 Jul 2024 13:16:21 +0000 (UTC) From: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: Michael Roth , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , =?utf-8?q?Marc?= =?utf-8?q?-Andr=C3=A9_Lureau?= , Markus Armbruster , Paolo Bonzini Subject: [PATCH 2/5] chardev: add tracing of socket error conditions Date: Mon, 22 Jul 2024 14:16:08 +0100 Message-ID: <20240722131611.2820041-3-berrange@redhat.com> In-Reply-To: <20240722131611.2820041-1-berrange@redhat.com> References: <20240722131611.2820041-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass client-ip=170.10.133.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.133, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org This adds trace points to every error scenario in the chardev socket backend that can lead to termination of the connection. Signed-off-by: Daniel P. Berrangé Reviewed-by: Philippe Mathieu-Daudé --- chardev/char-socket.c | 34 +++++++++++++++++++++------------- chardev/trace-events | 10 ++++++++++ 2 files changed, 31 insertions(+), 13 deletions(-) diff --git a/chardev/char-socket.c b/chardev/char-socket.c index 812d7aa38a..582b88e6d8 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 @@ static int tcp_chr_write(Chardev *chr, const uint8_t *buf, int len) 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 @@ static ssize_t tcp_chr_recv(Chardev *chr, char *buf, size_t len) size_t i; int *msgfds = NULL; size_t msgfds_num = 0; + g_autoptr(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 +325,10 @@ static ssize_t tcp_chr_recv(Chardev *chr, char *buf, size_t len) errno = EAGAIN; ret = -1; } else if (ret == -1) { + trace_chr_socket_recv_err(chr, chr->label, error_get_pretty(err)); errno = EIO; + } else if (ret == 0) { + trace_chr_socket_recv_eof(chr, chr->label); } return ret; @@ -463,6 +469,7 @@ static void tcp_chr_disconnect_locked(Chardev *chr) 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 +528,7 @@ static gboolean tcp_chr_hup(QIOChannel *channel, void *opaque) { Chardev *chr = CHARDEV(opaque); + trace_chr_socket_hangup(chr, chr->label); tcp_chr_disconnect(chr); return G_SOURCE_REMOVE; } @@ -672,15 +680,17 @@ static gboolean tcp_chr_telnet_init_io(QIOChannel *ioc, SocketChardev *s = user_data; Chardev *chr = CHARDEV(s); TCPChardevTelnetInit *init = s->telnet_init; + g_autoptr(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)); tcp_chr_disconnect(chr); goto end; } @@ -762,12 +772,10 @@ static void tcp_chr_websock_handshake(QIOTask *task, gpointer user_data) { Chardev *chr = user_data; SocketChardev *s = user_data; - Error *err = NULL; + g_autoptr(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)); tcp_chr_disconnect(chr); } else { if (s->do_telnetopt) { @@ -802,12 +810,10 @@ static void tcp_chr_tls_handshake(QIOTask *task, { Chardev *chr = user_data; SocketChardev *s = user_data; - Error *err = NULL; + g_autoptr(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)); tcp_chr_disconnect(chr); } else { if (s->is_websock) { @@ -826,19 +832,21 @@ static void tcp_chr_tls_init(Chardev *chr) SocketChardev *s = SOCKET_CHARDEV(chr); QIOChannelTLS *tioc; gchar *name; + g_autoptr(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)); tcp_chr_disconnect(chr); return; } diff --git a/chardev/trace-events b/chardev/trace-events index 027107b0c1..7e97b8a988 100644 --- a/chardev/trace-events +++ b/chardev/trace-events @@ -17,3 +17,13 @@ spice_vmc_register_interface(void *scd) "spice vmc registered interface %p" 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"