binutils-gdb/gdb/gdbserver/gdbreplay.c

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/* Replay a remote debug session logfile for GDB.
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Copyright 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
Written by Fred Fish (fnf@cygnus.com) from pieces of gdbserver.
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This file is part of GDB.
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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 2 of the License, or
(at your option) any later version.
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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.
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You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
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#include "config.h"
#include <stdio.h>
#include <sys/file.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/tcp.h>
#include <signal.h>
#include <ctype.h>
#include <fcntl.h>
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#include <errno.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
/* Sort of a hack... */
#define EOL (EOF - 1)
static int remote_desc;
/* 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
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perror_with_name (char *string)
{
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#ifndef STDC_HEADERS
extern int sys_nerr;
extern char *sys_errlist[];
extern int errno;
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#endif
const char *err;
char *combined;
err = (errno < sys_nerr) ? sys_errlist[errno] : "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
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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
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remote_close (void)
{
close (remote_desc);
}
/* Open a connection to a remote debugger.
NAME is the filename used for communication. */
static void
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remote_open (char *name)
{
if (!strchr (name, ':'))
{
fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);
fflush (stderr);
exit (1);
}
else
{
char *port_str;
int port;
struct sockaddr_in sockaddr;
int tmp;
int tmp_desc;
port_str = strchr (name, ':');
port = atoi (port_str + 1);
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;
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setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
sizeof (tmp));
sockaddr.sin_family = PF_INET;
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sockaddr.sin_port = htons (port);
sockaddr.sin_addr.s_addr = INADDR_ANY;
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if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr))
|| listen (tmp_desc, 1))
perror_with_name ("Can't bind address");
tmp = sizeof (sockaddr);
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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;
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setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp));
/* Tell TCP not to delay small packets. This greatly speeds up
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interactive response. */
tmp = 1;
setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
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(char *) &tmp, sizeof (tmp));
close (tmp_desc); /* No longer need this */
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signal (SIGPIPE, SIG_IGN); /* If we don't do this, then gdbreplay simply
exits when the remote side dies. */
}
fcntl (remote_desc, F_SETFL, FASYNC);
fprintf (stderr, "Replay logfile using %s\n", name);
fflush (stderr);
}
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static int
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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
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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)
{
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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
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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);
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}
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
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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
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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]);
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}
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);
}