From patchwork Wed May 20 13:00:23 2020 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: 282290 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3FE4EC433E0 for ; Wed, 20 May 2020 13:02:49 +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 0DCFB207D3 for ; Wed, 20 May 2020 13:02:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="iFcTB/f+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0DCFB207D3 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+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:57202 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jbOMy-0004fQ-7L for qemu-devel@archiver.kernel.org; Wed, 20 May 2020 09:02:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44118) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jbOL6-0002QV-Sy for qemu-devel@nongnu.org; Wed, 20 May 2020 09:00:52 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:37914 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 1jbOL5-0004rp-LQ for qemu-devel@nongnu.org; Wed, 20 May 2020 09:00:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1589979650; 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=RSzRBZSrDZvf3d/ItUX679rPGM/XJ9GTRQNRCZFD0kc=; b=iFcTB/f+8TtdOpGzo9kLW7/7dSFU3SPGQGr52xMHHyLR6iVpOtwTHfRbL/LEqyt+S64hXy ln5PHkSpm0Xk6dYp52j5G2f6HQzF5PI0xCQdgd4SmmmWvRmAqo8QCRGuEkglyhWthA4Ydb /sO9fmS24qcVpfwo7smbIK19Buencs0= 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-308-EW2o-uf1MhmcoO2buVZXng-1; Wed, 20 May 2020 09:00:39 -0400 X-MC-Unique: EW2o-uf1MhmcoO2buVZXng-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2E4A58015D2; Wed, 20 May 2020 13:00:38 +0000 (UTC) Received: from localhost.localdomain.com (unknown [10.36.110.3]) by smtp.corp.redhat.com (Postfix) with ESMTP id 90E20101E678; Wed, 20 May 2020 13:00:35 +0000 (UTC) From: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= To: qemu-devel@nongnu.org Subject: [PULL 1/3] qemu-sockets: add abstract UNIX domain socket support Date: Wed, 20 May 2020 14:00:23 +0100 Message-Id: <20200520130025.2201467-2-berrange@redhat.com> In-Reply-To: <20200520130025.2201467-1-berrange@redhat.com> References: <20200520130025.2201467-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.120; envelope-from=berrange@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/19 22:48:02 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, 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_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: , Cc: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , xiaoqiang zhao , Markus Armbruster , Gerd Hoffmann , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: xiaoqiang zhao unix_listen/connect_saddr now support abstract address types two aditional BOOL switches are introduced: tight: whether to set @addrlen to the minimal string length, or the maximum sun_path length. default is TRUE abstract: whether we use abstract address. default is FALSE cli example: -monitor unix:/tmp/unix.socket,abstract,tight=off OR -chardev socket,path=/tmp/unix.socket,id=unix1,abstract,tight=on Signed-off-by: xiaoqiang zhao Signed-off-by: Daniel P. Berrangé --- chardev/char-socket.c | 4 ++++ chardev/char.c | 7 +++++++ qapi/sockets.json | 8 +++++++- util/qemu-sockets.c | 39 ++++++++++++++++++++++++++++++++------- 4 files changed, 50 insertions(+), 8 deletions(-) diff --git a/chardev/char-socket.c b/chardev/char-socket.c index 232e0a8604..e77699db48 100644 --- a/chardev/char-socket.c +++ b/chardev/char-socket.c @@ -1380,6 +1380,8 @@ static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend, const char *host = qemu_opt_get(opts, "host"); const char *port = qemu_opt_get(opts, "port"); const char *fd = qemu_opt_get(opts, "fd"); + bool tight = qemu_opt_get_bool(opts, "tight", true); + bool abstract = qemu_opt_get_bool(opts, "abstract", false); SocketAddressLegacy *addr; ChardevSocket *sock; @@ -1431,6 +1433,8 @@ static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend, addr->type = SOCKET_ADDRESS_LEGACY_KIND_UNIX; q_unix = addr->u.q_unix.data = g_new0(UnixSocketAddress, 1); q_unix->path = g_strdup(path); + q_unix->tight = tight; + q_unix->abstract = abstract; } else if (host) { addr->type = SOCKET_ADDRESS_LEGACY_KIND_INET; addr->u.inet.data = g_new(InetSocketAddress, 1); diff --git a/chardev/char.c b/chardev/char.c index 0196e2887b..ea06c5ff4d 100644 --- a/chardev/char.c +++ b/chardev/char.c @@ -939,6 +939,13 @@ QemuOptsList qemu_chardev_opts = { },{ .name = "logappend", .type = QEMU_OPT_BOOL, + },{ + .name = "tight", + .type = QEMU_OPT_BOOL, + .def_value_str = "on", + },{ + .name = "abstract", + .type = QEMU_OPT_BOOL, }, { /* end of list */ } }, diff --git a/qapi/sockets.json b/qapi/sockets.json index ea933ed4b2..cbd6ef35d0 100644 --- a/qapi/sockets.json +++ b/qapi/sockets.json @@ -73,12 +73,18 @@ # Captures a socket address in the local ("Unix socket") namespace. # # @path: filesystem path to use +# @tight: pass a socket address length confined to the minimum length of the +# abstract string, rather than the full sockaddr_un record length +# (only matters for abstract sockets, default true). (Since 5.1) +# @abstract: whether this is an abstract address, default false. (Since 5.1) # # Since: 1.3 ## { 'struct': 'UnixSocketAddress', 'data': { - 'path': 'str' } } + 'path': 'str', + '*tight': 'bool', + '*abstract': 'bool' } } ## # @VsockSocketAddress: diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c index 86c48b9fa5..b37d288866 100644 --- a/util/qemu-sockets.c +++ b/util/qemu-sockets.c @@ -863,6 +863,7 @@ static int unix_listen_saddr(UnixSocketAddress *saddr, char *pathbuf = NULL; const char *path; size_t pathlen; + size_t addrlen; sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); if (sock < 0) { @@ -879,9 +880,11 @@ static int unix_listen_saddr(UnixSocketAddress *saddr, } pathlen = strlen(path); - if (pathlen > sizeof(un.sun_path)) { + if (pathlen > sizeof(un.sun_path) || + (saddr->abstract && pathlen > (sizeof(un.sun_path) - 1))) { error_setg(errp, "UNIX socket path '%s' is too long", path); error_append_hint(errp, "Path must be less than %zu bytes\n", + saddr->abstract ? sizeof(un.sun_path) - 1 : sizeof(un.sun_path)); goto err; } @@ -903,7 +906,7 @@ static int unix_listen_saddr(UnixSocketAddress *saddr, close(fd); } - if (unlink(path) < 0 && errno != ENOENT) { + if (!saddr->abstract && unlink(path) < 0 && errno != ENOENT) { error_setg_errno(errp, errno, "Failed to unlink socket %s", path); goto err; @@ -911,9 +914,19 @@ static int unix_listen_saddr(UnixSocketAddress *saddr, memset(&un, 0, sizeof(un)); un.sun_family = AF_UNIX; - memcpy(un.sun_path, path, pathlen); + addrlen = sizeof(un); - if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) { + if (saddr->abstract) { + un.sun_path[0] = '\0'; + memcpy(&un.sun_path[1], path, pathlen); + if (saddr->tight) { + addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen; + } + } else { + memcpy(un.sun_path, path, pathlen); + } + + if (bind(sock, (struct sockaddr *) &un, addrlen) < 0) { error_setg_errno(errp, errno, "Failed to bind socket to %s", path); goto err; } @@ -936,6 +949,7 @@ static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) struct sockaddr_un un; int sock, rc; size_t pathlen; + size_t addrlen; if (saddr->path == NULL) { error_setg(errp, "unix connect: no path specified"); @@ -949,21 +963,32 @@ static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) } pathlen = strlen(saddr->path); - if (pathlen > sizeof(un.sun_path)) { + if (pathlen > sizeof(un.sun_path) || + (saddr->abstract && pathlen > (sizeof(un.sun_path) - 1))) { error_setg(errp, "UNIX socket path '%s' is too long", saddr->path); error_append_hint(errp, "Path must be less than %zu bytes\n", + saddr->abstract ? sizeof(un.sun_path) - 1 : sizeof(un.sun_path)); goto err; } memset(&un, 0, sizeof(un)); un.sun_family = AF_UNIX; - memcpy(un.sun_path, saddr->path, pathlen); + addrlen = sizeof(un); + if (saddr->abstract) { + un.sun_path[0] = '\0'; + memcpy(&un.sun_path[1], saddr->path, pathlen); + if (saddr->tight) { + addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen; + } + } else { + memcpy(un.sun_path, saddr->path, pathlen); + } /* connect to peer */ do { rc = 0; - if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) { + if (connect(sock, (struct sockaddr *) &un, addrlen) < 0) { rc = -errno; } } while (rc == -EINTR);