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binutils-gdb/gdb/gdbserver/gdbreplay.c

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/* Replay a remote debug session logfile for GDB.
Copyright (C) 1996, 1998, 1999, 2000, 2002, 2003, 2005, 2006, 2007
Free Software Foundation, Inc.
Written by Fred Fish (fnf@cygnus.com) from pieces of gdbserver.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "config.h"
#include <stdio.h>
#if HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#if HAVE_SIGNAL_H
#include <signal.h>
#endif
#include <ctype.h>
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#if HAVE_NETINET_TCP_H
#include <netinet/tcp.h>
#endif
#if HAVE_MALLOC_H
#include <malloc.h>
#endif
#if USE_WIN32API
#include <winsock.h>
#endif
#ifndef HAVE_SOCKLEN_T
typedef int socklen_t;
#endif
/* Sort of a hack... */
#define EOL (EOF - 1)
static int remote_desc;
#ifdef __MINGW32CE__
#ifndef COUNTOF
#define COUNTOF(STR) (sizeof (STR) / sizeof ((STR)[0]))
#endif
#define errno (GetLastError ())
char *
strerror (DWORD error)
{
static char buf[1024];
WCHAR *msgbuf;
DWORD lasterr = GetLastError ();
DWORD chars = FormatMessageW (FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_ALLOCATE_BUFFER,
NULL,
error,
0, /* Default language */
(LPVOID)&msgbuf,
0,
NULL);
if (chars != 0)
{
/* If there is an \r\n appended, zap it. */
if (chars >= 2
&& msgbuf[chars - 2] == '\r'
&& msgbuf[chars - 1] == '\n')
{
chars -= 2;
msgbuf[chars] = 0;
}
if (chars > ((COUNTOF (buf)) - 1))
{
chars = COUNTOF (buf) - 1;
msgbuf [chars] = 0;
}
wcstombs (buf, msgbuf, chars + 1);
LocalFree (msgbuf);
}
else
sprintf (buf, "unknown win32 error (%ld)", error);
SetLastError (lasterr);
return buf;
}
#endif /* __MINGW32CE__ */
/* Print the system error message for errno, and also mention STRING
as the file name for which the error was encountered.
Then return to command level. */
static void
perror_with_name (char *string)
{
#ifndef STDC_HEADERS
extern int errno;
#endif
const char *err;
char *combined;
err = strerror (errno);
if (err == NULL)
err = "unknown error";
combined = (char *) alloca (strlen (err) + strlen (string) + 3);
strcpy (combined, string);
strcat (combined, ": ");
strcat (combined, err);
fprintf (stderr, "\n%s.\n", combined);
fflush (stderr);
exit (1);
}
static void
sync_error (FILE *fp, char *desc, int expect, int got)
{
fprintf (stderr, "\n%s\n", desc);
fprintf (stderr, "At logfile offset %ld, expected '0x%x' got '0x%x'\n",
ftell (fp), expect, got);
fflush (stderr);
exit (1);
}
static void
remote_close (void)
{
#ifdef USE_WIN32API
closesocket (remote_desc);
#else
close (remote_desc);
#endif
}
/* Open a connection to a remote debugger.
NAME is the filename used for communication. */
static void
remote_open (char *name)
{
if (!strchr (name, ':'))
{
fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);
fflush (stderr);
exit (1);
}
else
{
#ifdef USE_WIN32API
static int winsock_initialized;
#endif
char *port_str;
int port;
struct sockaddr_in sockaddr;
socklen_t tmp;
int tmp_desc;
port_str = strchr (name, ':');
port = atoi (port_str + 1);
#ifdef USE_WIN32API
if (!winsock_initialized)
{
WSADATA wsad;
WSAStartup (MAKEWORD (1, 0), &wsad);
winsock_initialized = 1;
}
#endif
tmp_desc = socket (PF_INET, SOCK_STREAM, 0);
if (tmp_desc < 0)
perror_with_name ("Can't open socket");
/* Allow rapid reuse of this port. */
tmp = 1;
setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
sizeof (tmp));
sockaddr.sin_family = PF_INET;
sockaddr.sin_port = htons (port);
sockaddr.sin_addr.s_addr = INADDR_ANY;
if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr))
|| listen (tmp_desc, 1))
perror_with_name ("Can't bind address");
tmp = sizeof (sockaddr);
remote_desc = accept (tmp_desc, (struct sockaddr *) &sockaddr, &tmp);
if (remote_desc == -1)
perror_with_name ("Accept failed");
/* Enable TCP keep alive process. */
tmp = 1;
setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp));
/* Tell TCP not to delay small packets. This greatly speeds up
interactive response. */
tmp = 1;
setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
(char *) &tmp, sizeof (tmp));
#ifndef USE_WIN32API
close (tmp_desc); /* No longer need this */
signal (SIGPIPE, SIG_IGN); /* If we don't do this, then gdbreplay simply
exits when the remote side dies. */
#else
closesocket (tmp_desc); /* No longer need this */
#endif
}
#if defined(F_SETFL) && defined (FASYNC)
fcntl (remote_desc, F_SETFL, FASYNC);
#endif
fprintf (stderr, "Replay logfile using %s\n", name);
fflush (stderr);
}
static int
tohex (int ch)
{
if (ch >= '0' && ch <= '9')
{
return (ch - '0');
}
if (ch >= 'A' && ch <= 'F')
{
return (ch - 'A' + 10);
}
if (ch >= 'a' && ch <= 'f')
{
return (ch - 'a' + 10);
}
fprintf (stderr, "\nInvalid hex digit '%c'\n", ch);
fflush (stderr);
exit (1);
}
static int
logchar (FILE *fp)
{
int ch;
int ch2;
ch = fgetc (fp);
fputc (ch, stdout);
fflush (stdout);
switch (ch)
{
case '\n':
ch = EOL;
break;
case '\\':
ch = fgetc (fp);
fputc (ch, stdout);
fflush (stdout);
switch (ch)
{
case '\\':
break;
case 'b':
ch = '\b';
break;
case 'f':
ch = '\f';
break;
case 'n':
ch = '\n';
break;
case 'r':
ch = '\r';
break;
case 't':
ch = '\t';
break;
case 'v':
ch = '\v';
break;
case 'x':
ch2 = fgetc (fp);
fputc (ch2, stdout);
fflush (stdout);
ch = tohex (ch2) << 4;
ch2 = fgetc (fp);
fputc (ch2, stdout);
fflush (stdout);
ch |= tohex (ch2);
break;
default:
/* Treat any other char as just itself */
break;
}
default:
break;
}
return (ch);
}
/* Accept input from gdb and match with chars from fp (after skipping one
blank) up until a \n is read from fp (which is not matched) */
static void
expect (FILE *fp)
{
int fromlog;
unsigned char fromgdb;
if ((fromlog = logchar (fp)) != ' ')
{
sync_error (fp, "Sync error during gdb read of leading blank", ' ',
fromlog);
}
do
{
fromlog = logchar (fp);
if (fromlog == EOL)
{
break;
}
read (remote_desc, &fromgdb, 1);
}
while (fromlog == fromgdb);
if (fromlog != EOL)
{
sync_error (fp, "Sync error during read of gdb packet", fromlog,
fromgdb);
}
}
/* Play data back to gdb from fp (after skipping leading blank) up until a
\n is read from fp (which is discarded and not sent to gdb). */
static void
play (FILE *fp)
{
int fromlog;
char ch;
if ((fromlog = logchar (fp)) != ' ')
{
sync_error (fp, "Sync error skipping blank during write to gdb", ' ',
fromlog);
}
while ((fromlog = logchar (fp)) != EOL)
{
ch = fromlog;
write (remote_desc, &ch, 1);
}
}
int
main (int argc, char *argv[])
{
FILE *fp;
int ch;
if (argc < 3)
{
fprintf (stderr, "Usage: gdbreplay <logfile> <host:port>\n");
fflush (stderr);
exit (1);
}
fp = fopen (argv[1], "r");
if (fp == NULL)
{
perror_with_name (argv[1]);
}
remote_open (argv[2]);
while ((ch = logchar (fp)) != EOF)
{
switch (ch)
{
case 'w':
/* data sent from gdb to gdbreplay, accept and match it */
expect (fp);
break;
case 'r':
/* data sent from gdbreplay to gdb, play it */
play (fp);
break;
case 'c':
/* Command executed by gdb */
while ((ch = logchar (fp)) != EOL);
break;
}
}
remote_close ();
exit (0);
}
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