From patchwork Mon Jun 22 18:19:35 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Michal Privoznik X-Patchwork-Id: 11618623 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 46A5060D for ; Mon, 22 Jun 2020 18:20:56 +0000 (UTC) Received: from lists.gnu.org (unknown [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 1D5DA20732 for ; Mon, 22 Jun 2020 18:20:56 +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="IQB3uN3a" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1D5DA20732 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]:39502 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jnR3v-00013U-Ae for patchwork-qemu-devel@patchwork.kernel.org; Mon, 22 Jun 2020 14:20:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:40386) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jnR2t-00006g-JM for qemu-devel@nongnu.org; Mon, 22 Jun 2020 14:19:51 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:28910 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 1jnR2s-0005vJ-17 for qemu-devel@nongnu.org; Mon, 22 Jun 2020 14:19:51 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1592849989; 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=GAf7eDSh7BKOIu8HjEmHGkayHYgxEZUn4wuOKM1ut9U=; b=IQB3uN3aows/Qj4kNVzpTj0u6VPCobTlSufH/uS5CvGPu73gIMo/xtXc9VRNeF772CtCjC BEWGAbJLCcXmk9ovD5EnDFbbYeT0fHcGV3XO5xeN+mODr5AkPFJeiZ8va3Wty6T+7aVDjO mx5CJ7a3mCGsqi9mjyYm+0d9R2VIXWI= 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-428-0GHrxigYPAykF_g52EJvZg-1; Mon, 22 Jun 2020 14:19:47 -0400 X-MC-Unique: 0GHrxigYPAykF_g52EJvZg-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 1CB1B1883604; Mon, 22 Jun 2020 18:19:46 +0000 (UTC) Received: from localhost.localdomain (unknown [10.40.194.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id B274F18B05; Mon, 22 Jun 2020 18:19:44 +0000 (UTC) From: Michal Privoznik To: qemu-devel@nongnu.org Subject: [PATCH v3 1/2] util: Introduce qemu_get_host_name() Date: Mon, 22 Jun 2020 20:19:35 +0200 Message-Id: <02ebd01e1ff7b4aba70e58a674f457ec8e4cf20b.1592849834.git.mprivozn@redhat.com> In-Reply-To: References: 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=mprivozn@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/22 01:27:42 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_H3=-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: , Cc: pbonzini@redhat.com, vfeenstr@redhat.com, marcandre.lureau@gmail.com, mdroth@linux.vnet.ibm.com, sw@weilnetz.de Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" This function offers operating system agnostic way to fetch host name. It is implemented for both POSIX-like and Windows systems. Signed-off-by: Michal Privoznik Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Daniel P. Berrangé --- include/qemu/osdep.h | 10 ++++++++++ util/oslib-posix.c | 35 +++++++++++++++++++++++++++++++++++ util/oslib-win32.c | 13 +++++++++++++ 3 files changed, 58 insertions(+) diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h index ff7c17b857..a795d46b28 100644 --- a/include/qemu/osdep.h +++ b/include/qemu/osdep.h @@ -607,4 +607,14 @@ static inline void qemu_reset_optind(void) #endif } +/** + * qemu_get_host_name: + * @errp: Error object + * + * Operating system agnostic way of querying host name. + * + * Returns allocated hostname (caller should free), NULL on failure. + */ +char *qemu_get_host_name(Error **errp); + #endif diff --git a/util/oslib-posix.c b/util/oslib-posix.c index 916f1be224..3997ee0442 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -761,3 +761,38 @@ void sigaction_invoke(struct sigaction *action, } action->sa_sigaction(info->ssi_signo, &si, NULL); } + +#ifndef HOST_NAME_MAX +# ifdef _POSIX_HOST_NAME_MAX +# define HOST_NAME_MAX _POSIX_HOST_NAME_MAX +# else +# define HOST_NAME_MAX 255 +# endif +#endif + +char *qemu_get_host_name(Error **errp) +{ + long len = -1; + g_autofree char *hostname = NULL; + +#ifdef _SC_HOST_NAME_MAX + len = sysconf(_SC_HOST_NAME_MAX); +#endif /* _SC_HOST_NAME_MAX */ + + if (len < 0) { + len = HOST_NAME_MAX; + } + + /* Unfortunately, gethostname() below does not guarantee a + * NULL terminated string. Therefore, allocate one byte more + * to be sure. */ + hostname = g_new0(char, len + 1); + + if (gethostname(hostname, len) < 0) { + error_setg_errno(errp, errno, + "cannot get hostname"); + return NULL; + } + + return g_steal_pointer(&hostname); +} diff --git a/util/oslib-win32.c b/util/oslib-win32.c index e9b14ab178..3b49d27297 100644 --- a/util/oslib-win32.c +++ b/util/oslib-win32.c @@ -808,3 +808,16 @@ bool qemu_write_pidfile(const char *filename, Error **errp) } return true; } + +char *qemu_get_host_name(Error **errp) +{ + wchar_t tmp[MAX_COMPUTERNAME_LENGTH + 1]; + DWORD size = G_N_ELEMENTS(tmp); + + if (GetComputerNameW(tmp, &size) == 0) { + error_setg_win32(errp, GetLastError(), "failed close handle"); + return NULL; + } + + return g_utf16_to_utf8(tmp, size, NULL, NULL, NULL); +}