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/* Replay a remote debug session logfile for GDB.

   Copyright 1996, 1998, 1999, 2000 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 2 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, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#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>

#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

perror_with_name (char *string)

{

#ifndef STDC_HEADERS

  extern int sys_nerr;

  extern char *sys_errlist[];

  extern int errno;

#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

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)

{

  close (remote_desc);

}

/* 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

    {

      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;

      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));

      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.  */

    }

  fcntl (remote_desc, F_SETFL, FASYNC);

  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);

}