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afa4336e94
This patch adds support for the newly introduced
VIR_DOMAIN_CONSOLE_FORCE and VIR_DOMAIN_CONSOLE_SAFE flags. The console
command now has an optional parameter --force that specifies that the
user wants to forcibly interrupt an ongoing console session and create
a new one. Flag --safe requests that the console should be opened only
if the hypervisor driver supports safe console handling.
The behaviour to this point was that the daemon opened two streams to
the console, that competed for data from the pipe, and the result was
that both of the consoles ended up scrambled.
This patch doesn't modify operation of other commands dealing with
console connections (start, create) as those open connections to newly
started domains making it virtually impossible for another client to race
for the console and steal it.
* tools/console.c:
- add support for flag passthrough
* tools/console.h:
- modify function prototypes to match impl.
* tools/virsh.c:
- add flag --force for the console command
415 lines
12 KiB
C
415 lines
12 KiB
C
/*
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* console.c: A dumb serial console client
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*
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* Copyright (C) 2007-2008, 2010-2011 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Daniel Berrange <berrange@redhat.com>
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*/
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#include <config.h>
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#ifndef WIN32
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# include <stdio.h>
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# include <sys/types.h>
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# include <sys/stat.h>
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# include <fcntl.h>
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# include <termios.h>
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# include <poll.h>
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# include <string.h>
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# include <errno.h>
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# include <unistd.h>
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# include <signal.h>
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# include "internal.h"
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# include "console.h"
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# include "logging.h"
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# include "util.h"
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# include "virfile.h"
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# include "memory.h"
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# include "threads.h"
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# include "virterror_internal.h"
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/*
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* Convert given character to control character.
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* Basically, we assume ASCII, and take lower 6 bits.
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*/
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# define CONTROL(c) ((c) ^ 0x40)
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# define VIR_FROM_THIS VIR_FROM_NONE
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struct virConsoleBuffer {
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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 virConsole virConsole;
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typedef virConsole *virConsolePtr;
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struct virConsole {
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virStreamPtr st;
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bool quit;
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virMutex lock;
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virCond cond;
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int stdinWatch;
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int stdoutWatch;
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struct virConsoleBuffer streamToTerminal;
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struct virConsoleBuffer terminalToStream;
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char escapeChar;
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};
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static int got_signal = 0;
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static void do_signal(int sig ATTRIBUTE_UNUSED) {
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got_signal = 1;
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}
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# ifndef HAVE_CFMAKERAW
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static void
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cfmakeraw (struct termios *attr)
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{
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attr->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
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| INLCR | IGNCR | ICRNL | IXON);
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attr->c_oflag &= ~OPOST;
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attr->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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attr->c_cflag &= ~(CSIZE | PARENB);
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attr->c_cflag |= CS8;
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}
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# endif /* !HAVE_CFMAKERAW */
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static void
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virConsoleShutdown(virConsolePtr con)
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{
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if (con->st) {
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virStreamEventRemoveCallback(con->st);
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virStreamAbort(con->st);
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virStreamFree(con->st);
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}
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VIR_FREE(con->streamToTerminal.data);
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VIR_FREE(con->terminalToStream.data);
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if (con->stdinWatch != -1)
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virEventRemoveHandle(con->stdinWatch);
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if (con->stdoutWatch != -1)
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virEventRemoveHandle(con->stdoutWatch);
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con->stdinWatch = -1;
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con->stdoutWatch = -1;
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con->quit = true;
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virCondSignal(&con->cond);
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}
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static void
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virConsoleEventOnStream(virStreamPtr st,
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int events, void *opaque)
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{
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virConsolePtr con = opaque;
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if (events & VIR_STREAM_EVENT_READABLE) {
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size_t avail = con->streamToTerminal.length -
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con->streamToTerminal.offset;
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int got;
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if (avail < 1024) {
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if (VIR_REALLOC_N(con->streamToTerminal.data,
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con->streamToTerminal.length + 1024) < 0) {
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virReportOOMError();
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virConsoleShutdown(con);
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return;
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}
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con->streamToTerminal.length += 1024;
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avail += 1024;
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}
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got = virStreamRecv(st,
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con->streamToTerminal.data +
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con->streamToTerminal.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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virConsoleShutdown(con);
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return;
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}
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con->streamToTerminal.offset += got;
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if (con->streamToTerminal.offset)
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virEventUpdateHandle(con->stdoutWatch,
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VIR_EVENT_HANDLE_WRITABLE);
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}
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if (events & VIR_STREAM_EVENT_WRITABLE &&
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con->terminalToStream.offset) {
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ssize_t done;
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size_t avail;
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done = virStreamSend(con->st,
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con->terminalToStream.data,
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con->terminalToStream.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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virConsoleShutdown(con);
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return;
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}
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memmove(con->terminalToStream.data,
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con->terminalToStream.data + done,
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con->terminalToStream.offset - done);
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con->terminalToStream.offset -= done;
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avail = con->terminalToStream.length - con->terminalToStream.offset;
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if (avail > 1024) {
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if (VIR_REALLOC_N(con->terminalToStream.data,
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con->terminalToStream.offset + 1024) < 0)
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{}
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con->terminalToStream.length = con->terminalToStream.offset + 1024;
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}
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}
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if (!con->terminalToStream.offset)
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virStreamEventUpdateCallback(con->st,
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VIR_STREAM_EVENT_READABLE);
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if (events & VIR_STREAM_EVENT_ERROR ||
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events & VIR_STREAM_EVENT_HANGUP) {
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virConsoleShutdown(con);
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}
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}
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static void
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virConsoleEventOnStdin(int watch ATTRIBUTE_UNUSED,
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int fd ATTRIBUTE_UNUSED,
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int events,
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void *opaque)
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{
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virConsolePtr con = opaque;
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if (events & VIR_EVENT_HANDLE_READABLE) {
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size_t avail = con->terminalToStream.length -
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con->terminalToStream.offset;
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int got;
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if (avail < 1024) {
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if (VIR_REALLOC_N(con->terminalToStream.data,
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con->terminalToStream.length + 1024) < 0) {
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virReportOOMError();
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virConsoleShutdown(con);
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return;
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}
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con->terminalToStream.length += 1024;
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avail += 1024;
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}
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got = read(fd,
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con->terminalToStream.data +
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con->terminalToStream.offset,
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avail);
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if (got < 0) {
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if (errno != EAGAIN) {
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virConsoleShutdown(con);
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}
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return;
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}
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if (got == 0) {
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virConsoleShutdown(con);
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return;
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}
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if (con->terminalToStream.data[con->terminalToStream.offset] == con->escapeChar) {
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virConsoleShutdown(con);
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return;
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}
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con->terminalToStream.offset += got;
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if (con->terminalToStream.offset)
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virStreamEventUpdateCallback(con->st,
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VIR_STREAM_EVENT_READABLE |
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VIR_STREAM_EVENT_WRITABLE);
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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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virConsoleShutdown(con);
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}
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}
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static void
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virConsoleEventOnStdout(int watch ATTRIBUTE_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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virConsolePtr con = opaque;
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if (events & VIR_EVENT_HANDLE_WRITABLE &&
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con->streamToTerminal.offset) {
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ssize_t done;
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size_t avail;
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done = write(fd,
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con->streamToTerminal.data,
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con->streamToTerminal.offset);
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if (done < 0) {
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if (errno != EAGAIN) {
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virConsoleShutdown(con);
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}
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return;
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}
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memmove(con->streamToTerminal.data,
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con->streamToTerminal.data + done,
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con->streamToTerminal.offset - done);
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con->streamToTerminal.offset -= done;
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avail = con->streamToTerminal.length - con->streamToTerminal.offset;
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if (avail > 1024) {
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if (VIR_REALLOC_N(con->streamToTerminal.data,
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con->streamToTerminal.offset + 1024) < 0)
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{}
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con->streamToTerminal.length = con->streamToTerminal.offset + 1024;
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}
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}
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if (!con->streamToTerminal.offset)
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virEventUpdateHandle(con->stdoutWatch, 0);
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if (events & VIR_EVENT_HANDLE_ERROR ||
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events & VIR_EVENT_HANDLE_HANGUP) {
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virConsoleShutdown(con);
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}
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}
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static char
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vshGetEscapeChar(const char *s)
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{
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if (*s == '^')
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return CONTROL(s[1]);
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return *s;
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}
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int vshRunConsole(virDomainPtr dom,
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const char *dev_name,
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const char *escape_seq,
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unsigned int flags)
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{
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int ret = -1;
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struct termios ttyattr, rawattr;
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void (*old_sigquit)(int);
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void (*old_sigterm)(int);
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void (*old_sigint)(int);
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void (*old_sighup)(int);
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void (*old_sigpipe)(int);
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virConsolePtr con = NULL;
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/* Put STDIN into raw mode so that stuff typed
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does not echo to the screen (the TTY reads will
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result in it being echoed back already), and
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also ensure Ctrl-C, etc is blocked, and misc
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other bits */
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if (tcgetattr(STDIN_FILENO, &ttyattr) < 0) {
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VIR_ERROR(_("unable to get tty attributes: %s"),
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strerror(errno));
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return -1;
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}
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rawattr = ttyattr;
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cfmakeraw(&rawattr);
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &rawattr) < 0) {
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VIR_ERROR(_("unable to set tty attributes: %s"),
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strerror(errno));
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goto resettty;
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}
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/* Trap all common signals so that we can safely restore
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the original terminal settings on STDIN before the
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process exits - people don't like being left with a
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messed up terminal ! */
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old_sigquit = signal(SIGQUIT, do_signal);
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old_sigterm = signal(SIGTERM, do_signal);
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old_sigint = signal(SIGINT, do_signal);
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old_sighup = signal(SIGHUP, do_signal);
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old_sigpipe = signal(SIGPIPE, do_signal);
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got_signal = 0;
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if (VIR_ALLOC(con) < 0) {
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virReportOOMError();
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goto cleanup;
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}
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con->escapeChar = vshGetEscapeChar(escape_seq);
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con->st = virStreamNew(virDomainGetConnect(dom),
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VIR_STREAM_NONBLOCK);
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if (!con->st)
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goto cleanup;
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if (virDomainOpenConsole(dom, dev_name, con->st, flags) < 0)
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goto cleanup;
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if (virCondInit(&con->cond) < 0 || virMutexInit(&con->lock) < 0)
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goto cleanup;
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con->stdinWatch = virEventAddHandle(STDIN_FILENO,
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VIR_EVENT_HANDLE_READABLE,
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virConsoleEventOnStdin,
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con,
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NULL);
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con->stdoutWatch = virEventAddHandle(STDOUT_FILENO,
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0,
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virConsoleEventOnStdout,
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con,
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NULL);
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virStreamEventAddCallback(con->st,
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VIR_STREAM_EVENT_READABLE,
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virConsoleEventOnStream,
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con,
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NULL);
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while (!con->quit) {
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if (virCondWait(&con->cond, &con->lock) < 0) {
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VIR_ERROR(_("unable to wait on console condition"));
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goto cleanup;
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}
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}
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ret = 0;
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cleanup:
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if (con) {
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if (con->st)
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virStreamFree(con->st);
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virMutexDestroy(&con->lock);
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ignore_value(virCondDestroy(&con->cond));
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VIR_FREE(con);
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}
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/* Restore original signal handlers */
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signal(SIGPIPE, old_sigpipe);
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signal(SIGHUP, old_sighup);
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signal(SIGINT, old_sigint);
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signal(SIGTERM, old_sigterm);
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signal(SIGQUIT, old_sigquit);
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resettty:
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/* Put STDIN back into the (sane?) state we found
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it in before starting */
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tcsetattr(STDIN_FILENO, TCSAFLUSH, &ttyattr);
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return ret;
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}
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#endif /* !WIN32 */
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