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libvirt/tools/virsh-console.c
Daniel P. Berrangé 600462834f Remove all Author(s): lines from source file headers 
In many files there are header comments that contain an Author:
statement, supposedly reflecting who originally wrote the code.
In a large collaborative project like libvirt, any non-trivial
file will have been modified by a large number of different
contributors. IOW, the Author: comments are quickly out of date,
omitting people who have made significant contribitions.

In some places Author: lines have been added despite the person
merely being responsible for creating the file by moving existing
code out of another file. IOW, the Author: lines give an incorrect
record of authorship.

With this all in mind, the comments are useless as a means to identify
who to talk to about code in a particular file. Contributors will always
be better off using 'git log' and 'git blame' if they need to  find the
author of a particular bit of code.

This commit thus deletes all Author: comments from the source and adds
a rule to prevent them reappearing.

The Copyright headers are similarly misleading and inaccurate, however,
we cannot delete these as they have legal meaning, despite being largely
inaccurate. In addition only the copyright holder is permitted to change
their respective copyright statement.

Reviewed-by: Erik Skultety <eskultet@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-12-13 16:08:38 +00:00

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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/>.
*/
#include <config.h>
#ifndef WIN32
# include <sys/types.h>
# include <sys/stat.h>
# include <fcntl.h>
# include <termios.h>
# include <poll.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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