gdb/gdbserver/gdbreplay.c

   1 /* Replay a remote debug session logfile for GDB.
   2    Copyright (C) 1996, 1998-2000, 2002-2003, 2005-2012 Free Software
   3    Foundation, Inc.
   4    Written by Fred Fish (fnf@cygnus.com) from pieces of gdbserver.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include <stdio.h>
  23 #if HAVE_SYS_FILE_H
  24 #include <sys/file.h>
  25 #endif
  26 #if HAVE_SIGNAL_H
  27 #include <signal.h>
  28 #endif
  29 #include <ctype.h>
  30 #if HAVE_FCNTL_H
  31 #include <fcntl.h>
  32 #endif
  33 #if HAVE_ERRNO_H
  34 #include <errno.h>
  35 #endif
  36 #ifdef HAVE_STDLIB_H
  37 #include <stdlib.h>
  38 #endif
  39 #ifdef HAVE_STRING_H
  40 #include <string.h>
  41 #endif
  42 #ifdef HAVE_UNISTD_H
  43 #include <unistd.h>
  44 #endif
  45 #ifdef HAVE_NETINET_IN_H
  46 #include <netinet/in.h>
  47 #endif
  48 #ifdef HAVE_SYS_SOCKET_H
  49 #include <sys/socket.h>
  50 #endif
  51 #if HAVE_NETDB_H
  52 #include <netdb.h>
  53 #endif
  54 #if HAVE_NETINET_TCP_H
  55 #include <netinet/tcp.h>
  56 #endif
  57 #if HAVE_ALLOCA_H
  58 #include <alloca.h>
  59 #endif
  60 #if HAVE_MALLOC_H
  61 #include <malloc.h>
  62 #endif
  63 #if USE_WIN32API
  64 #include <winsock2.h>
  65 #endif
  66
  67 #ifndef HAVE_SOCKLEN_T
  68 typedef int socklen_t;
  69 #endif
  70
  71 /* Sort of a hack... */
  72 #define EOL (EOF - 1)
  73
  74 /* Version information, from version.c.  */
  75 extern const char version[];
  76 extern const char host_name[];
  77
  78 static int remote_desc;
  79
  80 #ifdef __MINGW32CE__
  81
  82 #ifndef COUNTOF
  83 #define COUNTOF(STR) (sizeof (STR) / sizeof ((STR)[0]))
  84 #endif
  85
  86 #define errno (GetLastError ())
  87
  88 char *
  89 strerror (DWORD error)
  90 {
  91   static char buf[1024];
  92   WCHAR *msgbuf;
  93   DWORD lasterr = GetLastError ();
  94   DWORD chars = FormatMessageW (FORMAT_MESSAGE_FROM_SYSTEM
  95                                 | FORMAT_MESSAGE_ALLOCATE_BUFFER,
  96                                 NULL,
  97                                 error,
  98                                 0, /* Default language */
  99                                 (LPVOID)&msgbuf,
 100                                 0,
 101                                 NULL);
 102   if (chars != 0)
 103     {
 104       /* If there is an \r\n appended, zap it.  */
 105       if (chars >= 2
 106           && msgbuf[chars - 2] == '\r'
 107           && msgbuf[chars - 1] == '\n')
 108         {
 109           chars -= 2;
 110           msgbuf[chars] = 0;
 111         }
 112
 113       if (chars > ((COUNTOF (buf)) - 1))
 114         {
 115           chars = COUNTOF (buf) - 1;
 116           msgbuf [chars] = 0;
 117         }
 118
 119       wcstombs (buf, msgbuf, chars + 1);
 120       LocalFree (msgbuf);
 121     }
 122   else
 123     sprintf (buf, "unknown win32 error (%ld)", error);
 124
 125   SetLastError (lasterr);
 126   return buf;
 127 }
 128
 129 #endif /* __MINGW32CE__ */
 130
 131 /* Print the system error message for errno, and also mention STRING
 132    as the file name for which the error was encountered.
 133    Then return to command level.  */
 134
 135 static void
 136 perror_with_name (const char *string)
 137 {
 138 #ifndef STDC_HEADERS
 139   extern int errno;
 140 #endif
 141   const char *err;
 142   char *combined;
 143
 144   err = strerror (errno);
 145   if (err == NULL)
 146     err = "unknown error";
 147
 148   combined = (char *) alloca (strlen (err) + strlen (string) + 3);
 149   strcpy (combined, string);
 150   strcat (combined, ": ");
 151   strcat (combined, err);
 152   fprintf (stderr, "\n%s.\n", combined);
 153   fflush (stderr);
 154   exit (1);
 155 }
 156
 157 static void
 158 sync_error (FILE *fp, char *desc, int expect, int got)
 159 {
 160   fprintf (stderr, "\n%s\n", desc);
 161   fprintf (stderr, "At logfile offset %ld, expected '0x%x' got '0x%x'\n",
 162            ftell (fp), expect, got);
 163   fflush (stderr);
 164   exit (1);
 165 }
 166
 167 static void
 168 remote_error (const char *desc)
 169 {
 170   fprintf (stderr, "\n%s\n", desc);
 171   fflush (stderr);
 172   exit (1);
 173 }
 174
 175 static void
 176 remote_close (void)
 177 {
 178 #ifdef USE_WIN32API
 179   closesocket (remote_desc);
 180 #else
 181   close (remote_desc);
 182 #endif
 183 }
 184
 185 /* Open a connection to a remote debugger.
 186    NAME is the filename used for communication.  */
 187
 188 static void
 189 remote_open (char *name)
 190 {
 191   if (!strchr (name, ':'))
 192     {
 193       fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);
 194       fflush (stderr);
 195       exit (1);
 196     }
 197   else
 198     {
 199 #ifdef USE_WIN32API
 200       static int winsock_initialized;
 201 #endif
 202       char *port_str;
 203       int port;
 204       struct sockaddr_in sockaddr;
 205       socklen_t tmp;
 206       int tmp_desc;
 207
 208       port_str = strchr (name, ':');
 209
 210       port = atoi (port_str + 1);
 211
 212 #ifdef USE_WIN32API
 213       if (!winsock_initialized)
 214         {
 215           WSADATA wsad;
 216
 217           WSAStartup (MAKEWORD (1, 0), &wsad);
 218           winsock_initialized = 1;
 219         }
 220 #endif
 221
 222       tmp_desc = socket (PF_INET, SOCK_STREAM, 0);
 223       if (tmp_desc == -1)
 224         perror_with_name ("Can't open socket");
 225
 226       /* Allow rapid reuse of this port. */
 227       tmp = 1;
 228       setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
 229                   sizeof (tmp));
 230
 231       sockaddr.sin_family = PF_INET;
 232       sockaddr.sin_port = htons (port);
 233       sockaddr.sin_addr.s_addr = INADDR_ANY;
 234
 235       if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr))
 236           || listen (tmp_desc, 1))
 237         perror_with_name ("Can't bind address");
 238
 239       tmp = sizeof (sockaddr);
 240       remote_desc = accept (tmp_desc, (struct sockaddr *) &sockaddr, &tmp);
 241       if (remote_desc == -1)
 242         perror_with_name ("Accept failed");
 243
 244       /* Enable TCP keep alive process. */
 245       tmp = 1;
 246       setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE,
 247                   (char *) &tmp, sizeof (tmp));
 248
 249       /* Tell TCP not to delay small packets.  This greatly speeds up
 250          interactive response. */
 251       tmp = 1;
 252       setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
 253                   (char *) &tmp, sizeof (tmp));
 254
 255 #ifndef USE_WIN32API
 256       close (tmp_desc);         /* No longer need this */
 257
 258       signal (SIGPIPE, SIG_IGN);        /* If we don't do this, then
 259                                            gdbreplay simply exits when
 260                                            the remote side dies.  */
 261 #else
 262       closesocket (tmp_desc);   /* No longer need this */
 263 #endif
 264     }
 265
 266 #if defined(F_SETFL) && defined (FASYNC)
 267   fcntl (remote_desc, F_SETFL, FASYNC);
 268 #endif
 269
 270   fprintf (stderr, "Replay logfile using %s\n", name);
 271   fflush (stderr);
 272 }
 273
 274 static int
 275 tohex (int ch)
 276 {
 277   if (ch >= '0' && ch <= '9')
 278     {
 279       return (ch - '0');
 280     }
 281   if (ch >= 'A' && ch <= 'F')
 282     {
 283       return (ch - 'A' + 10);
 284     }
 285   if (ch >= 'a' && ch <= 'f')
 286     {
 287       return (ch - 'a' + 10);
 288     }
 289   fprintf (stderr, "\nInvalid hex digit '%c'\n", ch);
 290   fflush (stderr);
 291   exit (1);
 292 }
 293
 294 static int
 295 logchar (FILE *fp)
 296 {
 297   int ch;
 298   int ch2;
 299
 300   ch = fgetc (fp);
 301   fputc (ch, stdout);
 302   fflush (stdout);
 303   switch (ch)
 304     {
 305     case '\n':
 306       ch = EOL;
 307       break;
 308     case '\\':
 309       ch = fgetc (fp);
 310       fputc (ch, stdout);
 311       fflush (stdout);
 312       switch (ch)
 313         {
 314         case '\\':
 315           break;
 316         case 'b':
 317           ch = '\b';
 318           break;
 319         case 'f':
 320           ch = '\f';
 321           break;
 322         case 'n':
 323           ch = '\n';
 324           break;
 325         case 'r':
 326           ch = '\r';
 327           break;
 328         case 't':
 329           ch = '\t';
 330           break;
 331         case 'v':
 332           ch = '\v';
 333           break;
 334         case 'x':
 335           ch2 = fgetc (fp);
 336           fputc (ch2, stdout);
 337           fflush (stdout);
 338           ch = tohex (ch2) << 4;
 339           ch2 = fgetc (fp);
 340           fputc (ch2, stdout);
 341           fflush (stdout);
 342           ch |= tohex (ch2);
 343           break;
 344         default:
 345           /* Treat any other char as just itself */
 346           break;
 347         }
 348     default:
 349       break;
 350     }
 351   return (ch);
 352 }
 353
 354 static int
 355 gdbchar (int desc)
 356 {
 357   unsigned char fromgdb;
 358
 359   if (read (desc, &fromgdb, 1) != 1)
 360     return -1;
 361   else
 362     return fromgdb;
 363 }
 364
 365 /* Accept input from gdb and match with chars from fp (after skipping one
 366    blank) up until a \n is read from fp (which is not matched) */
 367
 368 static void
 369 expect (FILE *fp)
 370 {
 371   int fromlog;
 372   int fromgdb;
 373
 374   if ((fromlog = logchar (fp)) != ' ')
 375     {
 376       sync_error (fp, "Sync error during gdb read of leading blank", ' ',
 377                   fromlog);
 378     }
 379   do
 380     {
 381       fromlog = logchar (fp);
 382       if (fromlog == EOL)
 383         break;
 384       fromgdb = gdbchar (remote_desc);
 385       if (fromgdb < 0)
 386         remote_error ("Error during read from gdb");
 387     }
 388   while (fromlog == fromgdb);
 389
 390   if (fromlog != EOL)
 391     {
 392       sync_error (fp, "Sync error during read of gdb packet from log", fromlog,
 393                   fromgdb);
 394     }
 395 }
 396
 397 /* Play data back to gdb from fp (after skipping leading blank) up until a
 398    \n is read from fp (which is discarded and not sent to gdb). */
 399
 400 static void
 401 play (FILE *fp)
 402 {
 403   int fromlog;
 404   char ch;
 405
 406   if ((fromlog = logchar (fp)) != ' ')
 407     {
 408       sync_error (fp, "Sync error skipping blank during write to gdb", ' ',
 409                   fromlog);
 410     }
 411   while ((fromlog = logchar (fp)) != EOL)
 412     {
 413       ch = fromlog;
 414       if (write (remote_desc, &ch, 1) != 1)
 415         remote_error ("Error during write to gdb");
 416     }
 417 }
 418
 419 static void
 420 gdbreplay_version (void)
 421 {
 422   printf ("GNU gdbreplay %s%s\n"
 423           "Copyright (C) 2012 Free Software Foundation, Inc.\n"
 424           "gdbreplay is free software, covered by "
 425           "the GNU General Public License.\n"
 426           "This gdbreplay was configured as \"%s\"\n",
 427           PKGVERSION, version, host_name);
 428 }
 429
 430 static void
 431 gdbreplay_usage (FILE *stream)
 432 {
 433   fprintf (stream, "Usage:\tgdbreplay <logfile> <host:port>\n");
 434   if (REPORT_BUGS_TO[0] && stream == stdout)
 435     fprintf (stream, "Report bugs to \"%s\".\n", REPORT_BUGS_TO);
 436 }
 437
 438 int
 439 main (int argc, char *argv[])
 440 {
 441   FILE *fp;
 442   int ch;
 443
 444   if (argc >= 2 && strcmp (argv[1], "--version") == 0)
 445     {
 446       gdbreplay_version ();
 447       exit (0);
 448     }
 449   if (argc >= 2 && strcmp (argv[1], "--help") == 0)
 450     {
 451       gdbreplay_usage (stdout);
 452       exit (0);
 453     }
 454
 455   if (argc < 3)
 456     {
 457       gdbreplay_usage (stderr);
 458       exit (1);
 459     }
 460   fp = fopen (argv[1], "r");
 461   if (fp == NULL)
 462     {
 463       perror_with_name (argv[1]);
 464     }
 465   remote_open (argv[2]);
 466   while ((ch = logchar (fp)) != EOF)
 467     {
 468       switch (ch)
 469         {
 470         case 'w':
 471           /* data sent from gdb to gdbreplay, accept and match it */
 472           expect (fp);
 473           break;
 474         case 'r':
 475           /* data sent from gdbreplay to gdb, play it */
 476           play (fp);
 477           break;
 478         case 'c':
 479           /* Command executed by gdb */
 480           while ((ch = logchar (fp)) != EOL);
 481           break;
 482         }
 483     }
 484   remote_close ();
 485   exit (0);
 486 }