From patchwork Thu Jun 11 11:17:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Dr. David Alan Gilbert" X-Patchwork-Id: 11599741 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 769D3618 for ; Thu, 11 Jun 2020 11:19:52 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 4BEEB2063A for ; Thu, 11 Jun 2020 11:19:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="FtlKd7Le" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4BEEB2063A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:58952 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jjLFP-000587-JM for patchwork-qemu-devel@patchwork.kernel.org; Thu, 11 Jun 2020 07:19:51 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42618) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jjLCu-0001nD-Vj for qemu-devel@nongnu.org; Thu, 11 Jun 2020 07:17:18 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:48956 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jjLCs-0003zv-Qt for qemu-devel@nongnu.org; Thu, 11 Jun 2020 07:17:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591874233; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JZUM30HithXix6eV/zUUUkvVwY9gnckp++ff4Je8OQs=; b=FtlKd7LeEral8upcA1aAcIsg7AixxPbpf5f7vM8LyhCtTL0gwUXjh1Sg5C3ux2jOTO/vVv LqoYyB5BP87HQ/DTMXmCcra0uHVwhXo8WLjdL3OH6NBngBPgulDq8bxHV5qjBF/t7/jsx9 lXv2q7huTQkvxga1JzOTwHEcV2aKT3o= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-66-UmxToQNvOwy2iAuiSMW6jw-1; Thu, 11 Jun 2020 07:17:11 -0400 X-MC-Unique: UmxToQNvOwy2iAuiSMW6jw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0610B835B43 for ; Thu, 11 Jun 2020 11:17:11 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-114-116.ams2.redhat.com [10.36.114.116]) by smtp.corp.redhat.com (Postfix) with ESMTP id 04A5D60BF3; Thu, 11 Jun 2020 11:17:07 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, armbru@redhat.com, thuth@redhat.com, quintela@redhat.com Subject: [PATCH 1/2] qmp: Add 'openfd' command Date: Thu, 11 Jun 2020 12:17:02 +0100 Message-Id: <20200611111703.159590-2-dgilbert@redhat.com> In-Reply-To: <20200611111703.159590-1-dgilbert@redhat.com> References: <20200611111703.159590-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.120; envelope-from=dgilbert@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/11 03:29:33 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: "Dr. David Alan Gilbert" The existing 'getfd' command imports an fd from the monitor via SCM rights. This command allows qemu to open the file for itself; this is convenient primarily in testing, or with simple QMP clients. Signed-off-by: Dr. David Alan Gilbert --- monitor/misc.c | 48 ++++++++++++++++++++++++++++++++++++++---------- qapi/misc.json | 23 ++++++++++++++++++++++- 2 files changed, 60 insertions(+), 11 deletions(-) diff --git a/monitor/misc.c b/monitor/misc.c index f5207cd242..d538af592a 100644 --- a/monitor/misc.c +++ b/monitor/misc.c @@ -1230,22 +1230,20 @@ static void hmp_acl_remove(Monitor *mon, const QDict *qdict) } } -void qmp_getfd(const char *fdname, Error **errp) +/* + * Add a named fd to the monitor list. + * Returns true on success. + */ +static bool addfd(const char *fdname, int fd, Error **errp) { mon_fd_t *monfd; - int fd, tmp_fd; - - fd = qemu_chr_fe_get_msgfd(&cur_mon->chr); - if (fd == -1) { - error_setg(errp, QERR_FD_NOT_SUPPLIED); - return; - } + int tmp_fd; if (qemu_isdigit(fdname[0])) { close(fd); error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "fdname", "a name not starting with a digit"); - return; + return false; } qemu_mutex_lock(&cur_mon->mon_lock); @@ -1259,7 +1257,7 @@ void qmp_getfd(const char *fdname, Error **errp) qemu_mutex_unlock(&cur_mon->mon_lock); /* Make sure close() is outside critical section */ close(tmp_fd); - return; + return true; } monfd = g_malloc0(sizeof(mon_fd_t)); @@ -1268,6 +1266,36 @@ void qmp_getfd(const char *fdname, Error **errp) QLIST_INSERT_HEAD(&cur_mon->fds, monfd, next); qemu_mutex_unlock(&cur_mon->mon_lock); + + return true; +} + +void qmp_getfd(const char *fdname, Error **errp) +{ + int fd = qemu_chr_fe_get_msgfd(&cur_mon->chr); + if (fd == -1) { + error_setg(errp, QERR_FD_NOT_SUPPLIED); + return; + } + + if (!addfd(fdname, fd, errp)) { + close(fd); + } +} + +void qmp_openfd(const char *fdname, const char *filename, Error **errp) +{ + int fd; + + fd = open(filename, O_RDWR | O_CREAT, S_IRWXU); + if (fd == -1) { + error_setg_errno(errp, errno, "Cannot open file '%s'", filename); + return; + } + + if (!addfd(fdname, fd, errp)) { + close(fd); + } } void qmp_closefd(const char *fdname, Error **errp) diff --git a/qapi/misc.json b/qapi/misc.json index 99b90ac80b..baec07358e 100644 --- a/qapi/misc.json +++ b/qapi/misc.json @@ -952,7 +952,7 @@ ## # @closefd: # -# Close a file descriptor previously passed via SCM rights +# Close a named file descriptor # # @fdname: file descriptor name # @@ -968,6 +968,27 @@ ## { 'command': 'closefd', 'data': {'fdname': 'str'} } +## +# @openfd: +# +# Open a file descriptor. The file is opened read-write. +# +# @fdname: file descriptor name +# @filename: file name +# +# Returns: Nothing on success +# +# Since: 5.1 +# +# Example: +# +# -> { "execute": "openfd", "arguments": { "fdname": "null", +# "filename": "/dev/null" } } +# <- { "return": {} } +# +## +{ 'command': 'openfd', 'data': {'fdname': 'str', 'filename': 'str'} } + ## # @MemoryInfo: #