From patchwork Sat Apr 29 19:14:02 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Samuel Thibault X-Patchwork-Id: 9705887 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 436C0603F7 for ; Sat, 29 Apr 2017 19:14:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2EED028179 for ; Sat, 29 Apr 2017 19:14:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 23A1728304; Sat, 29 Apr 2017 19:14:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id BDFA128210 for ; Sat, 29 Apr 2017 19:14:55 +0000 (UTC) Received: from localhost ([::1]:42063 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d4XpW-0007To-9Q for patchwork-qemu-devel@patchwork.kernel.org; Sat, 29 Apr 2017 15:14:54 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58404) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d4Xok-0007Ti-45 for qemu-devel@nongnu.org; Sat, 29 Apr 2017 15:14:07 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d4Xoj-0006lw-5N for qemu-devel@nongnu.org; Sat, 29 Apr 2017 15:14:06 -0400 Received: from hera.aquilenet.fr ([2a01:474::1]:55871) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d4Xoi-0006ll-RV for qemu-devel@nongnu.org; Sat, 29 Apr 2017 15:14:05 -0400 Received: from localhost (localhost [127.0.0.1]) by hera.aquilenet.fr (Postfix) with ESMTP id A4A23BF05; Sat, 29 Apr 2017 21:14:03 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at aquilenet.fr Received: from hera.aquilenet.fr ([127.0.0.1]) by localhost (hera.aquilenet.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RBQgsXZq0Vod; Sat, 29 Apr 2017 21:14:02 +0200 (CEST) Received: from var.youpi.perso.aquilenet.fr (unknown [IPv6:2a01:cb19:181:c200:3602:86ff:fe2c:6a19]) by hera.aquilenet.fr (Postfix) with ESMTPSA id DF8AABEB8; Sat, 29 Apr 2017 21:14:02 +0200 (CEST) Received: from samy by var.youpi.perso.aquilenet.fr with local (Exim 4.89) (envelope-from ) id 1d4Xog-0000cF-30; Sat, 29 Apr 2017 21:14:02 +0200 Date: Sat, 29 Apr 2017 21:14:02 +0200 From: Samuel Thibault To: FONNEMANN Mark Message-ID: <20170429191402.ebsdilnya67ispla@var.youpi.perso.aquilenet.fr> References: <20170429124421.2qcthvlsiwvtqov2@var.youpi.perso.aquilenet.fr> <20170429171002.enxmz5dtuzhrxuc6@var.youpi.perso.aquilenet.fr> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Organization: I am not organized User-Agent: NeoMutt/20170113 (1.7.2) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2a01:474::1 Subject: Re: [Qemu-devel] dns server not working in QEMU using usermode networking (SLIRP) X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stefan Weil , Thomas Huth , "qemu-devel@nongnu.org" , MCDONALD Margaret Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP FONNEMANN Mark, on sam. 29 avril 2017 18:25:26 +0000, wrote: > 0 packets received by filter Ok, so nothing going out from qemu. Could you try to apply the attached patch to qemu-2.9 and see what it makes qemu print when you resolve a domain from the guest? Samuel --- a/slirp/socket.c +++ b/slirp/socket.c @@ -814,11 +814,18 @@ void sotranslate_out(struct socket *so, switch (addr->ss_family) { case AF_INET: + fprintf(stderr,"translating %x against %x %x\n", + so->so_faddr.s_addr, + slirp->vnetwork_mask.s_addr, + slirp->vnameserver_addr.s_addr); if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) == slirp->vnetwork_addr.s_addr) { /* It's an alias */ + fprintf(stderr,"it's an alias\n"); if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) { + fprintf(stderr,"it's DNS\n"); if (get_dns_addr(&sin->sin_addr) < 0) { + fprintf(stderr,"didn't get DNS address"); sin->sin_addr = loopback_addr; } } else { --- a/slirp/udp.c +++ b/slirp/udp.c @@ -133,6 +133,10 @@ udp_input(register struct mbuf *m, int i lhost4->sin_addr = ip->ip_src; lhost4->sin_port = uh->uh_sport; + if (ntohs(uh->uh_dport) == 53 && + ip->ip_dst.s_addr == slirp->vnameserver_addr.s_addr) + fprintf(stderr,"UDP packet for DNS server\n"); + /* * handle DHCP/BOOTP */ --- a/slirp/slirp.c +++ b/slirp/slirp.c @@ -165,6 +165,7 @@ static int get_dns_addr_resolv_conf(int #endif while (fgets(buff, 512, f) != NULL) { if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) { + fprintf(stderr,"got resolv.conf entry '%s'\n", buff2); char *c = strchr(buff2, '%'); if (c) { if_index = if_nametoindex(c + 1); @@ -174,10 +175,16 @@ static int get_dns_addr_resolv_conf(int } if (!inet_pton(af, buff2, tmp_addr)) { + fprintf(stderr,"couldn't parse it\n"); continue; } /* If it's the first one, set it to dns_addr */ if (!found) { + if (af == AF_INET) + { + struct sockaddr_in *sin = tmp_addr; + fprintf(stderr,"parsed %x\n", sin->sin_addr.s_addr); + } memcpy(pdns_addr, tmp_addr, addrlen); memcpy(cached_addr, tmp_addr, addrlen); if (scope_id) { @@ -219,6 +226,7 @@ int get_dns_addr(struct in_addr *pdns_ad if (dns_addr.s_addr != 0) { int ret; + fprintf(stderr,"dns_addr is cached: %x\n", dns_addr.s_addr); ret = get_dns_addr_cached(pdns_addr, &dns_addr, sizeof(dns_addr), &dns_addr_stat, &dns_addr_time); if (ret <= 0) {