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libvirt/tools/virsh-console.c
Erik Skultety 834c5720e4 tools: Introduce new client generic module vsh 
In order to share as much virsh' logic as possible with upcomming
virt-admin client we need to split virsh logic into virsh specific and
client generic features.

Since majority of virsh methods should be generic enough to be used by
other clients, it's much easier to rename virsh specific data to virshX
than doing this vice versa. It moved generic virsh commands (including info
and opts structures) to generic module vsh.c.

Besides renaming methods and structures, this patch also involves introduction
of a client specific control structure being referenced as private data in the
original control structure, introduction of a new global vsh Initializer,
which currently doesn't do much, but there is a potential for added
functionality in the future.
Lastly it introduced client hooks which are especially necessary during
client connecting phase.
2015-08-14 15:45:44 +02:00

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/*
* virsh-console.c: A dumb serial console client
*
* Copyright (C) 2007-2008, 2010-2014 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
* Authors:
* Daniel Berrange <berrange@redhat.com>
*/
#include <config.h>
#ifndef WIN32
# include <stdio.h>
# include <sys/types.h>
# include <sys/stat.h>
# include <fcntl.h>
# include <termios.h>
# include <poll.h>
# include <string.h>
# include <errno.h>
# include <unistd.h>
# include <signal.h>
# include <c-ctype.h>
# include "internal.h"
# include "virsh.h"
# include "virsh-console.h"
# include "virlog.h"
# include "virfile.h"
# include "viralloc.h"
# include "virthread.h"
# include "virerror.h"
VIR_LOG_INIT("tools.virsh-console");
/*
* Convert given character to control character.
* Basically, we assume ASCII, and take lower 6 bits.
*/
# define CONTROL(c) ((c) ^ 0x40)
# define VIR_FROM_THIS VIR_FROM_NONE
struct virConsoleBuffer {
size_t length;
size_t offset;
char *data;
};
typedef struct virConsole virConsole;
typedef virConsole *virConsolePtr;
struct virConsole {
virStreamPtr st;
bool quit;
virMutex lock;
virCond cond;
int stdinWatch;
int stdoutWatch;
struct virConsoleBuffer streamToTerminal;
struct virConsoleBuffer terminalToStream;
char escapeChar;
};
static void
virConsoleHandleSignal(int sig ATTRIBUTE_UNUSED)
{
}
static void
virConsoleShutdown(virConsolePtr con)
{
if (con->st) {
virStreamEventRemoveCallback(con->st);
virStreamAbort(con->st);
virStreamFree(con->st);
con->st = NULL;
}
VIR_FREE(con->streamToTerminal.data);
VIR_FREE(con->terminalToStream.data);
if (con->stdinWatch != -1)
virEventRemoveHandle(con->stdinWatch);
if (con->stdoutWatch != -1)
virEventRemoveHandle(con->stdoutWatch);
con->stdinWatch = -1;
con->stdoutWatch = -1;
con->quit = true;
virCondSignal(&con->cond);
}
static void
virConsoleFree(virConsolePtr con)
{
if (!con)
return;
if (con->st)
virStreamFree(con->st);
virMutexDestroy(&con->lock);
virCondDestroy(&con->cond);
VIR_FREE(con);
}
static void
virConsoleEventOnStream(virStreamPtr st,
int events, void *opaque)
{
virConsolePtr con = opaque;
if (events & VIR_STREAM_EVENT_READABLE) {
size_t avail = con->streamToTerminal.length -
con->streamToTerminal.offset;
int got;
if (avail < 1024) {
if (VIR_REALLOC_N(con->streamToTerminal.data,
con->streamToTerminal.length + 1024) < 0) {
virConsoleShutdown(con);
return;
}
con->streamToTerminal.length += 1024;
avail += 1024;
}
got = virStreamRecv(st,
con->streamToTerminal.data +
con->streamToTerminal.offset,
avail);
if (got == -2)
return; /* blocking */
if (got <= 0) {
virConsoleShutdown(con);
return;
}
con->streamToTerminal.offset += got;
if (con->streamToTerminal.offset)
virEventUpdateHandle(con->stdoutWatch,
VIR_EVENT_HANDLE_WRITABLE);
}
if (events & VIR_STREAM_EVENT_WRITABLE &&
con->terminalToStream.offset) {
ssize_t done;
size_t avail;
done = virStreamSend(con->st,
con->terminalToStream.data,
con->terminalToStream.offset);
if (done == -2)
return; /* blocking */
if (done < 0) {
virConsoleShutdown(con);
return;
}
memmove(con->terminalToStream.data,
con->terminalToStream.data + done,
con->terminalToStream.offset - done);
con->terminalToStream.offset -= done;
avail = con->terminalToStream.length - con->terminalToStream.offset;
if (avail > 1024) {
ignore_value(VIR_REALLOC_N(con->terminalToStream.data,
con->terminalToStream.offset + 1024));
con->terminalToStream.length = con->terminalToStream.offset + 1024;
}
}
if (!con->terminalToStream.offset)
virStreamEventUpdateCallback(con->st,
VIR_STREAM_EVENT_READABLE);
if (events & VIR_STREAM_EVENT_ERROR ||
events & VIR_STREAM_EVENT_HANGUP) {
virConsoleShutdown(con);
}
}
static void
virConsoleEventOnStdin(int watch ATTRIBUTE_UNUSED,
int fd ATTRIBUTE_UNUSED,
int events,
void *opaque)
{
virConsolePtr con = opaque;
if (events & VIR_EVENT_HANDLE_READABLE) {
size_t avail = con->terminalToStream.length -
con->terminalToStream.offset;
int got;
if (avail < 1024) {
if (VIR_REALLOC_N(con->terminalToStream.data,
con->terminalToStream.length + 1024) < 0) {
virConsoleShutdown(con);
return;
}
con->terminalToStream.length += 1024;
avail += 1024;
}
got = read(fd,
con->terminalToStream.data +
con->terminalToStream.offset,
avail);
if (got < 0) {
if (errno != EAGAIN)
virConsoleShutdown(con);
return;
}
if (got == 0) {
virConsoleShutdown(con);
return;
}
if (con->terminalToStream.data[con->terminalToStream.offset] == con->escapeChar) {
virConsoleShutdown(con);
return;
}
con->terminalToStream.offset += got;
if (con->terminalToStream.offset)
virStreamEventUpdateCallback(con->st,
VIR_STREAM_EVENT_READABLE |
VIR_STREAM_EVENT_WRITABLE);
}
if (events & VIR_EVENT_HANDLE_ERROR ||
events & VIR_EVENT_HANDLE_HANGUP) {
virConsoleShutdown(con);
}
}
static void
virConsoleEventOnStdout(int watch ATTRIBUTE_UNUSED,
int fd,
int events,
void *opaque)
{
virConsolePtr con = opaque;
if (events & VIR_EVENT_HANDLE_WRITABLE &&
con->streamToTerminal.offset) {
ssize_t done;
size_t avail;
done = write(fd,
con->streamToTerminal.data,
con->streamToTerminal.offset);
if (done < 0) {
if (errno != EAGAIN)
virConsoleShutdown(con);
return;
}
memmove(con->streamToTerminal.data,
con->streamToTerminal.data + done,
con->streamToTerminal.offset - done);
con->streamToTerminal.offset -= done;
avail = con->streamToTerminal.length - con->streamToTerminal.offset;
if (avail > 1024) {
ignore_value(VIR_REALLOC_N(con->streamToTerminal.data,
con->streamToTerminal.offset + 1024));
con->streamToTerminal.length = con->streamToTerminal.offset + 1024;
}
}
if (!con->streamToTerminal.offset)
virEventUpdateHandle(con->stdoutWatch, 0);
if (events & VIR_EVENT_HANDLE_ERROR ||
events & VIR_EVENT_HANDLE_HANGUP) {
virConsoleShutdown(con);
}
}
static char
virshGetEscapeChar(const char *s)
{
if (*s == '^')
return CONTROL(c_toupper(s[1]));
return *s;
}
int
virshRunConsole(vshControl *ctl,
virDomainPtr dom,
const char *dev_name,
unsigned int flags)
{
virConsolePtr con = NULL;
virshControlPtr priv = ctl->privData;
int ret = -1;
struct sigaction old_sigquit;
struct sigaction old_sigterm;
struct sigaction old_sigint;
struct sigaction old_sighup;
struct sigaction old_sigpipe;
struct sigaction sighandler = {.sa_handler = virConsoleHandleSignal,
.sa_flags = SA_SIGINFO };
sigemptyset(&sighandler.sa_mask);
/* Put STDIN into raw mode so that stuff typed does not echo to the screen
* (the TTY reads will result in it being echoed back already), and also
* ensure Ctrl-C, etc is blocked, and misc other bits */
if (vshTTYMakeRaw(ctl, true) < 0)
goto resettty;
/* Trap all common signals so that we can safely restore the original
* terminal settings on STDIN before the process exits - people don't like
* being left with a messed up terminal ! */
sigaction(SIGQUIT, &sighandler, &old_sigquit);
sigaction(SIGTERM, &sighandler, &old_sigterm);
sigaction(SIGINT, &sighandler, &old_sigint);
sigaction(SIGHUP, &sighandler, &old_sighup);
sigaction(SIGPIPE, &sighandler, &old_sigpipe);
if (VIR_ALLOC(con) < 0)
goto cleanup;
con->escapeChar = virshGetEscapeChar(priv->escapeChar);
con->st = virStreamNew(virDomainGetConnect(dom),
VIR_STREAM_NONBLOCK);
if (!con->st)
goto cleanup;
if (virDomainOpenConsole(dom, dev_name, con->st, flags) < 0)
goto cleanup;
if (virCondInit(&con->cond) < 0 || virMutexInit(&con->lock) < 0)
goto cleanup;
virMutexLock(&con->lock);
con->stdinWatch = virEventAddHandle(STDIN_FILENO,
VIR_EVENT_HANDLE_READABLE,
virConsoleEventOnStdin,
con,
NULL);
con->stdoutWatch = virEventAddHandle(STDOUT_FILENO,
0,
virConsoleEventOnStdout,
con,
NULL);
virStreamEventAddCallback(con->st,
VIR_STREAM_EVENT_READABLE,
virConsoleEventOnStream,
con,
NULL);
while (!con->quit) {
if (virCondWait(&con->cond, &con->lock) < 0) {
virMutexUnlock(&con->lock);
VIR_ERROR(_("unable to wait on console condition"));
goto cleanup;
}
}
virMutexUnlock(&con->lock);
ret = 0;
cleanup:
virConsoleFree(con);
/* Restore original signal handlers */
sigaction(SIGQUIT, &old_sigquit, NULL);
sigaction(SIGTERM, &old_sigterm, NULL);
sigaction(SIGINT, &old_sigint, NULL);
sigaction(SIGHUP, &old_sighup, NULL);
sigaction(SIGPIPE, &old_sigpipe, NULL);
resettty:
/* Put STDIN back into the (sane?) state we found
it in before starting */
vshTTYRestore(ctl);
return ret;
}
#endif /* !WIN32 */
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