gdb/gdbserver/gdbreplay.c - native_client/nacl-gdb - Git at Google

 /* Replay a remote debug session logfile for GDB.
    Copyright (C) 1996-2013 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 "build-gnulib-gdbserver/config.h"
 #include "version.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
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #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_ALLOCA_H
 #include <alloca.h>
 #endif
 #if HAVE_MALLOC_H
 #include <malloc.h>
 #endif
 #if USE_WIN32API
 #include <winsock2.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 (const 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_error (const char *desc)
 {
   fprintf (stderr, "\n%s\n", desc);
   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 == -1)
 	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);
 }

 static int
 gdbchar (int desc)
 {
   unsigned char fromgdb;

   if (read (desc, &fromgdb, 1) != 1)
     return -1;
   else
     return fromgdb;
 }

 /* 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;
   int 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;
       fromgdb = gdbchar (remote_desc);
       if (fromgdb < 0)
 	remote_error ("Error during read from gdb");
     }
   while (fromlog == fromgdb);

   if (fromlog != EOL)
     {
       sync_error (fp, "Sync error during read of gdb packet from log", 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;
       if (write (remote_desc, &ch, 1) != 1)
 	remote_error ("Error during write to gdb");
     }
 }

 static void
 gdbreplay_version (void)
 {
   printf ("GNU gdbreplay %s%s\n"
 	  "Copyright (C) 2013 Free Software Foundation, Inc.\n"
 	  "gdbreplay is free software, covered by "
 	  "the GNU General Public License.\n"
 	  "This gdbreplay was configured as \"%s\"\n",
 	  PKGVERSION, version, host_name);
 }

 static void
 gdbreplay_usage (FILE *stream)
 {
   fprintf (stream, "Usage:\tgdbreplay <logfile> <host:port>\n");
   if (REPORT_BUGS_TO[0] && stream == stdout)
     fprintf (stream, "Report bugs to \"%s\".\n", REPORT_BUGS_TO);
 }

 int
 main (int argc, char *argv[])
 {
   FILE *fp;
   int ch;

   if (argc >= 2 && strcmp (argv[1], "--version") == 0)
     {
       gdbreplay_version ();
       exit (0);
     }
   if (argc >= 2 && strcmp (argv[1], "--help") == 0)
     {
       gdbreplay_usage (stdout);
       exit (0);
     }

   if (argc < 3)
     {
       gdbreplay_usage (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);
 }
	/* Replay a remote debug session logfile for GDB.
	Copyright (C) 1996-2013 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 "build-gnulib-gdbserver/config.h"
	#include "version.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
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>
	#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_ALLOCA_H
	#include <alloca.h>
	#endif
	#if HAVE_MALLOC_H
	#include <malloc.h>
	#endif
	#if USE_WIN32API
	#include <winsock2.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 (const 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_error (const char *desc)
	{
	fprintf (stderr, "\n%s\n", desc);
	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 == -1)
	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);
	}

	static int
	gdbchar (int desc)
	{
	unsigned char fromgdb;

	if (read (desc, &fromgdb, 1) != 1)
	return -1;
	else
	return fromgdb;
	}

	/* 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;
	int 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;
	fromgdb = gdbchar (remote_desc);
	if (fromgdb < 0)
	remote_error ("Error during read from gdb");
	}
	while (fromlog == fromgdb);

	if (fromlog != EOL)
	{
	sync_error (fp, "Sync error during read of gdb packet from log", 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;
	if (write (remote_desc, &ch, 1) != 1)
	remote_error ("Error during write to gdb");
	}
	}

	static void
	gdbreplay_version (void)
	{
	printf ("GNU gdbreplay %s%s\n"
	"Copyright (C) 2013 Free Software Foundation, Inc.\n"
	"gdbreplay is free software, covered by "
	"the GNU General Public License.\n"
	"This gdbreplay was configured as \"%s\"\n",
	PKGVERSION, version, host_name);
	}

	static void
	gdbreplay_usage (FILE *stream)
	{
	fprintf (stream, "Usage:\tgdbreplay <logfile> <host:port>\n");
	if (REPORT_BUGS_TO[0] && stream == stdout)
	fprintf (stream, "Report bugs to \"%s\".\n", REPORT_BUGS_TO);
	}

	int
	main (int argc, char *argv[])
	{
	FILE *fp;
	int ch;

	if (argc >= 2 && strcmp (argv[1], "--version") == 0)
	{
	gdbreplay_version ();
	exit (0);
	}
	if (argc >= 2 && strcmp (argv[1], "--help") == 0)
	{
	gdbreplay_usage (stdout);
	exit (0);
	}

	if (argc < 3)
	{
	gdbreplay_usage (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);
	}