2019-07-08 15:38:49 +00:00
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/*
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* remote_ssh_helper.c: a netcat replacement for proxying ssh tunnel to daemon
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*
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* Copyright (C) 2020 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <unistd.h>
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#include "rpc/virnetsocket.h"
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#include "viralloc.h"
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#include "virlog.h"
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#include "virgettext.h"
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#include "virfile.h"
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#include "remote_sockets.h"
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#define VIR_FROM_THIS VIR_FROM_REMOTE
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2020-11-25 17:22:51 +00:00
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#define SSH_BUF_SIZE (1024 * 1024)
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2019-07-08 15:38:49 +00:00
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VIR_LOG_INIT("remote.remote_ssh_helper");
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struct virRemoteSSHHelperBuffer {
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size_t length;
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size_t offset;
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char *data;
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};
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typedef struct virRemoteSSHHelper virRemoteSSHHelper;
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struct virRemoteSSHHelper {
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bool quit;
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2021-03-11 07:16:13 +00:00
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virNetSocket *sock;
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2020-11-25 17:22:51 +00:00
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int sockEvents;
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2019-07-08 15:38:49 +00:00
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int stdinWatch;
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2020-11-25 17:22:51 +00:00
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int stdinEvents;
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2019-07-08 15:38:49 +00:00
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int stdoutWatch;
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2020-11-25 17:22:51 +00:00
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int stdoutEvents;
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2019-07-08 15:38:49 +00:00
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struct virRemoteSSHHelperBuffer sockToTerminal;
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struct virRemoteSSHHelperBuffer terminalToSock;
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};
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static void
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2021-03-11 07:16:13 +00:00
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virRemoteSSHHelperShutdown(virRemoteSSHHelper *proxy)
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2019-07-08 15:38:49 +00:00
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{
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if (proxy->sock) {
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virNetSocketRemoveIOCallback(proxy->sock);
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virNetSocketClose(proxy->sock);
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virObjectUnref(proxy->sock);
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proxy->sock = NULL;
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}
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VIR_FREE(proxy->sockToTerminal.data);
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VIR_FREE(proxy->terminalToSock.data);
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if (proxy->stdinWatch != -1)
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virEventRemoveHandle(proxy->stdinWatch);
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if (proxy->stdoutWatch != -1)
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virEventRemoveHandle(proxy->stdoutWatch);
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proxy->stdinWatch = -1;
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proxy->stdoutWatch = -1;
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if (!proxy->quit)
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proxy->quit = true;
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}
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2020-11-25 17:22:51 +00:00
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static void
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2021-03-11 07:16:13 +00:00
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virRemoteSSHHelperUpdateEvents(virRemoteSSHHelper *proxy)
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2020-11-25 17:22:51 +00:00
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{
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int sockEvents = 0;
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int stdinEvents = 0;
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int stdoutEvents = 0;
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if (proxy->terminalToSock.offset != 0)
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sockEvents |= VIR_EVENT_HANDLE_WRITABLE;
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if (proxy->terminalToSock.offset < proxy->terminalToSock.length)
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stdinEvents |= VIR_EVENT_HANDLE_READABLE;
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if (proxy->sockToTerminal.offset != 0)
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stdoutEvents |= VIR_EVENT_HANDLE_WRITABLE;
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if (proxy->sockToTerminal.offset < proxy->sockToTerminal.length)
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sockEvents |= VIR_EVENT_HANDLE_READABLE;
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if (sockEvents != proxy->sockEvents) {
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VIR_DEBUG("Update sock events %d -> %d", proxy->sockEvents, sockEvents);
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virNetSocketUpdateIOCallback(proxy->sock, sockEvents);
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proxy->sockEvents = sockEvents;
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}
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if (stdinEvents != proxy->stdinEvents) {
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VIR_DEBUG("Update stdin events %d -> %d", proxy->stdinEvents, stdinEvents);
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virEventUpdateHandle(proxy->stdinWatch, stdinEvents);
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proxy->stdinEvents = stdinEvents;
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}
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if (stdoutEvents != proxy->stdoutEvents) {
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VIR_DEBUG("Update stdout events %d -> %d", proxy->stdoutEvents, stdoutEvents);
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virEventUpdateHandle(proxy->stdoutWatch, stdoutEvents);
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proxy->stdoutEvents = stdoutEvents;
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}
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}
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2019-07-08 15:38:49 +00:00
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static void
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2021-03-11 07:16:13 +00:00
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virRemoteSSHHelperEventOnSocket(virNetSocket *sock,
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2019-07-08 15:38:49 +00:00
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int events,
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void *opaque)
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{
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2021-03-11 07:16:13 +00:00
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virRemoteSSHHelper *proxy = opaque;
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2019-07-08 15:38:49 +00:00
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/* we got late event after proxy was shutdown */
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if (!proxy->sock)
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return;
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if (events & VIR_EVENT_HANDLE_READABLE) {
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size_t avail = proxy->sockToTerminal.length -
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proxy->sockToTerminal.offset;
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int got;
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2020-11-25 17:22:51 +00:00
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if (avail == 0) {
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VIR_DEBUG("Unexpectedly called with no space in buffer");
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goto cleanup;
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2019-07-08 15:38:49 +00:00
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}
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got = virNetSocketRead(sock,
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proxy->sockToTerminal.data +
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proxy->sockToTerminal.offset,
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avail);
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if (got == -2)
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return; /* blocking */
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if (got == 0) {
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VIR_DEBUG("EOF on socket, shutting down");
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virRemoteSSHHelperShutdown(proxy);
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return;
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}
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if (got < 0) {
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virRemoteSSHHelperShutdown(proxy);
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return;
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}
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proxy->sockToTerminal.offset += got;
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}
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if (events & VIR_EVENT_HANDLE_WRITABLE &&
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proxy->terminalToSock.offset) {
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ssize_t done;
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done = virNetSocketWrite(proxy->sock,
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proxy->terminalToSock.data,
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proxy->terminalToSock.offset);
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if (done == -2)
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return; /* blocking */
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if (done < 0) {
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virRemoteSSHHelperShutdown(proxy);
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return;
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}
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2020-11-25 17:22:51 +00:00
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2019-07-08 15:38:49 +00:00
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memmove(proxy->terminalToSock.data,
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proxy->terminalToSock.data + done,
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proxy->terminalToSock.offset - done);
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proxy->terminalToSock.offset -= done;
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}
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if (events & VIR_EVENT_HANDLE_ERROR ||
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events & VIR_EVENT_HANDLE_HANGUP) {
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virRemoteSSHHelperShutdown(proxy);
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2020-11-25 17:22:51 +00:00
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return;
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2019-07-08 15:38:49 +00:00
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}
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2020-11-25 17:22:51 +00:00
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cleanup:
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virRemoteSSHHelperUpdateEvents(proxy);
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2019-07-08 15:38:49 +00:00
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}
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static void
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virRemoteSSHHelperEventOnStdin(int watch G_GNUC_UNUSED,
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int fd G_GNUC_UNUSED,
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int events,
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void *opaque)
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{
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2021-03-11 07:16:13 +00:00
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virRemoteSSHHelper *proxy = opaque;
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2019-07-08 15:38:49 +00:00
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/* we got late event after console was shutdown */
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if (!proxy->sock)
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return;
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if (events & VIR_EVENT_HANDLE_READABLE) {
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size_t avail = proxy->terminalToSock.length -
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proxy->terminalToSock.offset;
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int got;
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2020-11-25 17:22:51 +00:00
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if (avail == 0) {
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VIR_DEBUG("Unexpectedly called with no space in buffer");
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goto cleanup;
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2019-07-08 15:38:49 +00:00
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}
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got = read(fd,
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proxy->terminalToSock.data +
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proxy->terminalToSock.offset,
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avail);
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if (got < 0) {
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if (errno != EAGAIN) {
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virReportSystemError(errno, "%s", _("cannot read from stdin"));
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virRemoteSSHHelperShutdown(proxy);
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}
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return;
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}
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if (got == 0) {
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VIR_DEBUG("EOF on stdin, shutting down");
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virRemoteSSHHelperShutdown(proxy);
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return;
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}
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proxy->terminalToSock.offset += got;
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}
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if (events & VIR_EVENT_HANDLE_ERROR) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("IO error on stdin"));
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virRemoteSSHHelperShutdown(proxy);
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return;
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}
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if (events & VIR_EVENT_HANDLE_HANGUP) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("EOF on stdin"));
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virRemoteSSHHelperShutdown(proxy);
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return;
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}
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2020-11-25 17:22:51 +00:00
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cleanup:
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virRemoteSSHHelperUpdateEvents(proxy);
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2019-07-08 15:38:49 +00:00
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}
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static void
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virRemoteSSHHelperEventOnStdout(int watch G_GNUC_UNUSED,
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int fd,
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int events,
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void *opaque)
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{
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2021-03-11 07:16:13 +00:00
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virRemoteSSHHelper *proxy = opaque;
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2019-07-08 15:38:49 +00:00
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/* we got late event after console was shutdown */
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if (!proxy->sock)
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return;
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if (events & VIR_EVENT_HANDLE_WRITABLE &&
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proxy->sockToTerminal.offset) {
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ssize_t done;
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done = write(fd,
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proxy->sockToTerminal.data,
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proxy->sockToTerminal.offset);
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if (done < 0) {
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if (errno != EAGAIN) {
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virReportSystemError(errno, "%s", _("cannot write to stdout"));
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virRemoteSSHHelperShutdown(proxy);
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}
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return;
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}
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memmove(proxy->sockToTerminal.data,
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proxy->sockToTerminal.data + done,
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proxy->sockToTerminal.offset - done);
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proxy->sockToTerminal.offset -= done;
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}
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if (events & VIR_EVENT_HANDLE_ERROR) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("IO error stdout"));
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virRemoteSSHHelperShutdown(proxy);
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return;
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}
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if (events & VIR_EVENT_HANDLE_HANGUP) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("EOF on stdout"));
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virRemoteSSHHelperShutdown(proxy);
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return;
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}
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2020-11-25 17:22:51 +00:00
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virRemoteSSHHelperUpdateEvents(proxy);
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2019-07-08 15:38:49 +00:00
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}
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static int
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2021-03-11 07:16:13 +00:00
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virRemoteSSHHelperRun(virNetSocket *sock)
|
2019-07-08 15:38:49 +00:00
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{
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int ret = -1;
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virRemoteSSHHelper proxy = {
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.sock = sock,
|
2020-11-25 17:22:51 +00:00
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.sockEvents = VIR_EVENT_HANDLE_READABLE,
|
2019-07-08 15:38:49 +00:00
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.stdinWatch = -1,
|
2020-11-25 17:22:51 +00:00
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.stdinEvents = VIR_EVENT_HANDLE_READABLE,
|
2019-07-08 15:38:49 +00:00
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.stdoutWatch = -1,
|
2020-11-25 17:22:51 +00:00
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.stdoutEvents = 0,
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.sockToTerminal = {
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.offset = 0,
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.length = SSH_BUF_SIZE,
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.data = g_new0(char, SSH_BUF_SIZE),
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},
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.terminalToSock = {
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.offset = 0,
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.length = SSH_BUF_SIZE,
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.data = g_new0(char, SSH_BUF_SIZE),
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},
|
2019-07-08 15:38:49 +00:00
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};
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virEventRegisterDefaultImpl();
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if ((proxy.stdinWatch = virEventAddHandle(STDIN_FILENO,
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VIR_EVENT_HANDLE_READABLE,
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virRemoteSSHHelperEventOnStdin,
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&proxy,
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NULL)) < 0)
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goto cleanup;
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if ((proxy.stdoutWatch = virEventAddHandle(STDOUT_FILENO,
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0,
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virRemoteSSHHelperEventOnStdout,
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&proxy,
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NULL)) < 0)
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goto cleanup;
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if (virNetSocketAddIOCallback(proxy.sock,
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VIR_EVENT_HANDLE_READABLE,
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virRemoteSSHHelperEventOnSocket,
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&proxy,
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NULL) < 0)
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goto cleanup;
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while (!proxy.quit)
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virEventRunDefaultImpl();
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if (virGetLastErrorCode() != VIR_ERR_OK)
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goto cleanup;
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ret = 0;
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cleanup:
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|
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if (proxy.stdinWatch != -1)
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virEventRemoveHandle(proxy.stdinWatch);
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if (proxy.stdoutWatch != -1)
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virEventRemoveHandle(proxy.stdoutWatch);
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return ret;
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}
|
|
|
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|
|
int main(int argc, char **argv)
|
|
|
|
{
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|
|
|
const char *uri_str = NULL;
|
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|
|
g_autoptr(virURI) uri = NULL;
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|
|
g_autofree char *driver = NULL;
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|
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remoteDriverTransport transport;
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gboolean version = false;
|
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|
gboolean readonly = false;
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|
|
g_autofree char *sock_path = NULL;
|
2021-05-24 13:08:44 +00:00
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|
|
g_autofree char *daemon_path = NULL;
|
2019-07-08 15:38:49 +00:00
|
|
|
g_autoptr(virNetSocket) sock = NULL;
|
|
|
|
GError *error = NULL;
|
|
|
|
g_autoptr(GOptionContext) context = NULL;
|
|
|
|
GOptionEntry entries[] = {
|
|
|
|
{ "readonly", 'r', 0, G_OPTION_ARG_NONE, &readonly, "Connect read-only", NULL },
|
|
|
|
{ "version", 'V', 0, G_OPTION_ARG_NONE, &version, "Display version information", NULL },
|
|
|
|
{ NULL, '\0', 0, 0, NULL, NULL, NULL }
|
|
|
|
};
|
2021-05-24 13:02:07 +00:00
|
|
|
unsigned int flags;
|
2019-07-08 15:38:49 +00:00
|
|
|
|
2021-12-10 10:59:33 +00:00
|
|
|
context = g_option_context_new("URI - libvirt socket proxy");
|
|
|
|
g_option_context_set_summary(context,
|
|
|
|
"Internal tool used to handle connections coming from remote\n"
|
|
|
|
"clients. Not intended to be called directly by the user.");
|
2019-07-08 15:38:49 +00:00
|
|
|
g_option_context_add_main_entries(context, entries, PACKAGE);
|
|
|
|
if (!g_option_context_parse(context, &argc, &argv, &error)) {
|
|
|
|
g_printerr(_("option parsing failed: %s\n"), error->message);
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (version) {
|
|
|
|
g_print("%s (%s) %s\n", argv[0], PACKAGE_NAME, PACKAGE_VERSION);
|
|
|
|
exit(EXIT_SUCCESS);
|
|
|
|
}
|
|
|
|
|
2021-12-10 10:59:33 +00:00
|
|
|
if (argc != 2) {
|
|
|
|
g_autofree char *help = g_option_context_get_help(context, TRUE, NULL);
|
|
|
|
g_printerr("%s", help);
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
2019-07-08 15:38:49 +00:00
|
|
|
virSetErrorFunc(NULL, NULL);
|
|
|
|
virSetErrorLogPriorityFunc(NULL);
|
|
|
|
|
|
|
|
if (virGettextInitialize() < 0 ||
|
|
|
|
virErrorInitialize() < 0) {
|
|
|
|
g_printerr(_("%s: initialization failed\n"), argv[0]);
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
|
|
|
virFileActivateDirOverrideForProg(argv[0]);
|
|
|
|
|
|
|
|
/* Initialize the log system */
|
2021-12-15 15:34:16 +00:00
|
|
|
if (virLogSetFromEnv() < 0)
|
|
|
|
exit(EXIT_FAILURE);
|
2019-07-08 15:38:49 +00:00
|
|
|
|
2021-12-10 13:53:31 +00:00
|
|
|
uri_str = argv[1];
|
2019-07-08 15:38:49 +00:00
|
|
|
VIR_DEBUG("Using URI %s", uri_str);
|
|
|
|
|
|
|
|
if (!(uri = virURIParse(uri_str))) {
|
|
|
|
g_printerr(("%s: cannot parse '%s': %s\n"),
|
|
|
|
argv[0], uri_str, virGetLastErrorMessage());
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (remoteSplitURIScheme(uri, &driver, &transport) < 0) {
|
|
|
|
g_printerr(_("%s: cannot parse URI transport '%s': %s\n"),
|
|
|
|
argv[0], uri_str, virGetLastErrorMessage());
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (transport != REMOTE_DRIVER_TRANSPORT_UNIX) {
|
|
|
|
g_printerr(_("%s: unexpected URI transport '%s'\n"),
|
|
|
|
argv[0], uri_str);
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
2021-05-24 13:02:07 +00:00
|
|
|
remoteGetURIDaemonInfo(uri, transport, &flags);
|
|
|
|
if (readonly)
|
|
|
|
flags |= REMOTE_DRIVER_OPEN_RO;
|
2019-07-08 15:38:49 +00:00
|
|
|
|
|
|
|
sock_path = remoteGetUNIXSocket(transport,
|
|
|
|
REMOTE_DRIVER_MODE_AUTO,
|
|
|
|
driver,
|
2021-05-24 13:02:07 +00:00
|
|
|
flags,
|
2021-05-24 13:08:44 +00:00
|
|
|
&daemon_path);
|
2019-07-08 15:38:49 +00:00
|
|
|
|
2021-05-24 14:07:19 +00:00
|
|
|
if (virNetSocketNewConnectUNIX(sock_path, daemon_path, &sock) < 0) {
|
2019-07-08 15:38:49 +00:00
|
|
|
g_printerr(_("%s: cannot connect to '%s': %s\n"),
|
|
|
|
argv[0], sock_path, virGetLastErrorMessage());
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (virRemoteSSHHelperRun(sock) < 0) {
|
|
|
|
g_printerr(_("%s: could not proxy traffic: %s\n"),
|
|
|
|
argv[0], virGetLastErrorMessage());
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
|
|
|
exit(EXIT_SUCCESS);
|
|
|
|
}
|