gdb/gdbserver/gdbreplay.c

   1 /* Replay a remote debug session logfile for GDB.
   2    Copyright (C) 1996, 1998, 1999, 2000, 2002, 2003, 2005, 2006, 2007, 2008,
   3    2009, 2010 Free Software 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_MALLOC_H
  58 #include <malloc.h>
  59 #endif
  60
  61 #if USE_WIN32API
  62 #include <winsock2.h>
  63 #endif
  64
  65 #ifndef HAVE_SOCKLEN_T
  66 typedef int socklen_t;
  67 #endif
  68
  69 /* Sort of a hack... */
  70 #define EOL (EOF - 1)
  71
  72 /* Version information, from version.c.  */
  73 extern const char version[];
  74 extern const char host_name[];
  75
  76 static int remote_desc;
  77
  78 #ifdef __MINGW32CE__
  79
  80 #ifndef COUNTOF
  81 #define COUNTOF(STR) (sizeof (STR) / sizeof ((STR)[0]))
  82 #endif
  83
  84 #define errno (GetLastError ())
  85
  86 char *
  87 strerror (DWORD error)
  88 {
  89   static char buf[1024];
  90   WCHAR *msgbuf;
  91   DWORD lasterr = GetLastError ();
  92   DWORD chars = FormatMessageW (FORMAT_MESSAGE_FROM_SYSTEM
  93                                 | FORMAT_MESSAGE_ALLOCATE_BUFFER,
  94                                 NULL,
  95                                 error,
  96                                 0, /* Default language */
  97                                 (LPVOID)&msgbuf,
  98                                 0,
  99                                 NULL);
 100   if (chars != 0)
 101     {
 102       /* If there is an \r\n appended, zap it.  */
 103       if (chars >= 2
 104           && msgbuf[chars - 2] == '\r'
 105           && msgbuf[chars - 1] == '\n')
 106         {
 107           chars -= 2;
 108           msgbuf[chars] = 0;
 109         }
 110
 111       if (chars > ((COUNTOF (buf)) - 1))
 112         {
 113           chars = COUNTOF (buf) - 1;
 114           msgbuf [chars] = 0;
 115         }
 116
 117       wcstombs (buf, msgbuf, chars + 1);
 118       LocalFree (msgbuf);
 119     }
 120   else
 121     sprintf (buf, "unknown win32 error (%ld)", error);
 122
 123   SetLastError (lasterr);
 124   return buf;
 125 }
 126
 127 #endif /* __MINGW32CE__ */
 128
 129 /* Print the system error message for errno, and also mention STRING
 130    as the file name for which the error was encountered.
 131    Then return to command level.  */
 132
 133 static void
 134 perror_with_name (const char *string)
 135 {
 136 #ifndef STDC_HEADERS
 137   extern int errno;
 138 #endif
 139   const char *err;
 140   char *combined;
 141
 142   err = strerror (errno);
 143   if (err == NULL)
 144     err = "unknown error";
 145
 146   combined = (char *) alloca (strlen (err) + strlen (string) + 3);
 147   strcpy (combined, string);
 148   strcat (combined, ": ");
 149   strcat (combined, err);
 150   fprintf (stderr, "\n%s.\n", combined);
 151   fflush (stderr);
 152   exit (1);
 153 }
 154
 155 static void
 156 sync_error (FILE *fp, char *desc, int expect, int got)
 157 {
 158   fprintf (stderr, "\n%s\n", desc);
 159   fprintf (stderr, "At logfile offset %ld, expected '0x%x' got '0x%x'\n",
 160            ftell (fp), expect, got);
 161   fflush (stderr);
 162   exit (1);
 163 }
 164
 165 static void
 166 remote_error (const char *desc)
 167 {
 168   fprintf (stderr, "\n%s\n", desc);
 169   fflush (stderr);
 170   exit (1);
 171 }
 172
 173 static void
 174 remote_close (void)
 175 {
 176 #ifdef USE_WIN32API
 177   closesocket (remote_desc);
 178 #else
 179   close (remote_desc);
 180 #endif
 181 }
 182
 183 /* Open a connection to a remote debugger.
 184    NAME is the filename used for communication.  */
 185
 186 static void
 187 remote_open (char *name)
 188 {
 189   if (!strchr (name, ':'))
 190     {
 191       fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);
 192       fflush (stderr);
 193       exit (1);
 194     }
 195   else
 196     {
 197 #ifdef USE_WIN32API
 198       static int winsock_initialized;
 199 #endif
 200       char *port_str;
 201       int port;
 202       struct sockaddr_in sockaddr;
 203       socklen_t tmp;
 204       int tmp_desc;
 205
 206       port_str = strchr (name, ':');
 207
 208       port = atoi (port_str + 1);
 209
 210 #ifdef USE_WIN32API
 211       if (!winsock_initialized)
 212         {
 213           WSADATA wsad;
 214
 215           WSAStartup (MAKEWORD (1, 0), &wsad);
 216           winsock_initialized = 1;
 217         }
 218 #endif
 219
 220       tmp_desc = socket (PF_INET, SOCK_STREAM, 0);
 221       if (tmp_desc == -1)
 222         perror_with_name ("Can't open socket");
 223
 224       /* Allow rapid reuse of this port. */
 225       tmp = 1;
 226       setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
 227                   sizeof (tmp));
 228
 229       sockaddr.sin_family = PF_INET;
 230       sockaddr.sin_port = htons (port);
 231       sockaddr.sin_addr.s_addr = INADDR_ANY;
 232
 233       if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr))
 234           || listen (tmp_desc, 1))
 235         perror_with_name ("Can't bind address");
 236
 237       tmp = sizeof (sockaddr);
 238       remote_desc = accept (tmp_desc, (struct sockaddr *) &sockaddr, &tmp);
 239       if (remote_desc == -1)
 240         perror_with_name ("Accept failed");
 241
 242       /* Enable TCP keep alive process. */
 243       tmp = 1;
 244       setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp));
 245
 246       /* Tell TCP not to delay small packets.  This greatly speeds up
 247          interactive response. */
 248       tmp = 1;
 249       setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
 250                   (char *) &tmp, sizeof (tmp));
 251
 252 #ifndef USE_WIN32API
 253       close (tmp_desc);         /* No longer need this */
 254
 255       signal (SIGPIPE, SIG_IGN);        /* If we don't do this, then gdbreplay simply
 256                                            exits when the remote side dies.  */
 257 #else
 258       closesocket (tmp_desc);   /* No longer need this */
 259 #endif
 260     }
 261
 262 #if defined(F_SETFL) && defined (FASYNC)
 263   fcntl (remote_desc, F_SETFL, FASYNC);
 264 #endif
 265
 266   fprintf (stderr, "Replay logfile using %s\n", name);
 267   fflush (stderr);
 268 }
 269
 270 static int
 271 tohex (int ch)
 272 {
 273   if (ch >= '0' && ch <= '9')
 274     {
 275       return (ch - '0');
 276     }
 277   if (ch >= 'A' && ch <= 'F')
 278     {
 279       return (ch - 'A' + 10);
 280     }
 281   if (ch >= 'a' && ch <= 'f')
 282     {
 283       return (ch - 'a' + 10);
 284     }
 285   fprintf (stderr, "\nInvalid hex digit '%c'\n", ch);
 286   fflush (stderr);
 287   exit (1);
 288 }
 289
 290 static int
 291 logchar (FILE *fp)
 292 {
 293   int ch;
 294   int ch2;
 295
 296   ch = fgetc (fp);
 297   fputc (ch, stdout);
 298   fflush (stdout);
 299   switch (ch)
 300     {
 301     case '\n':
 302       ch = EOL;
 303       break;
 304     case '\\':
 305       ch = fgetc (fp);
 306       fputc (ch, stdout);
 307       fflush (stdout);
 308       switch (ch)
 309         {
 310         case '\\':
 311           break;
 312         case 'b':
 313           ch = '\b';
 314           break;
 315         case 'f':
 316           ch = '\f';
 317           break;
 318         case 'n':
 319           ch = '\n';
 320           break;
 321         case 'r':
 322           ch = '\r';
 323           break;
 324         case 't':
 325           ch = '\t';
 326           break;
 327         case 'v':
 328           ch = '\v';
 329           break;
 330         case 'x':
 331           ch2 = fgetc (fp);
 332           fputc (ch2, stdout);
 333           fflush (stdout);
 334           ch = tohex (ch2) << 4;
 335           ch2 = fgetc (fp);
 336           fputc (ch2, stdout);
 337           fflush (stdout);
 338           ch |= tohex (ch2);
 339           break;
 340         default:
 341           /* Treat any other char as just itself */
 342           break;
 343         }
 344     default:
 345       break;
 346     }
 347   return (ch);
 348 }
 349
 350 static int
 351 gdbchar (int desc)
 352 {
 353   unsigned char fromgdb;
 354
 355   if (read (desc, &fromgdb, 1) != 1)
 356     return -1;
 357   else
 358     return fromgdb;
 359 }
 360
 361 /* Accept input from gdb and match with chars from fp (after skipping one
 362    blank) up until a \n is read from fp (which is not matched) */
 363
 364 static void
 365 expect (FILE *fp)
 366 {
 367   int fromlog;
 368   int fromgdb;
 369
 370   if ((fromlog = logchar (fp)) != ' ')
 371     {
 372       sync_error (fp, "Sync error during gdb read of leading blank", ' ',
 373                   fromlog);
 374     }
 375   do
 376     {
 377       fromlog = logchar (fp);
 378       if (fromlog == EOL)
 379         break;
 380       fromgdb = gdbchar (remote_desc);
 381       if (fromgdb < 0)
 382         remote_error ("Error during read from gdb");
 383     }
 384   while (fromlog == fromgdb);
 385
 386   if (fromlog != EOL)
 387     {
 388       sync_error (fp, "Sync error during read of gdb packet from log", fromlog,
 389                   fromgdb);
 390     }
 391 }
 392
 393 /* Play data back to gdb from fp (after skipping leading blank) up until a
 394    \n is read from fp (which is discarded and not sent to gdb). */
 395
 396 static void
 397 play (FILE *fp)
 398 {
 399   int fromlog;
 400   char ch;
 401
 402   if ((fromlog = logchar (fp)) != ' ')
 403     {
 404       sync_error (fp, "Sync error skipping blank during write to gdb", ' ',
 405                   fromlog);
 406     }
 407   while ((fromlog = logchar (fp)) != EOL)
 408     {
 409       ch = fromlog;
 410       if (write (remote_desc, &ch, 1) != 1)
 411         remote_error ("Error during write to gdb");
 412     }
 413 }
 414
 415 static void
 416 gdbreplay_version (void)
 417 {
 418   printf ("GNU gdbreplay %s%s\n"
 419           "Copyright (C) 2010 Free Software Foundation, Inc.\n"
 420           "gdbreplay is free software, covered by the GNU General Public License.\n"
 421           "This gdbreplay was configured as \"%s\"\n",
 422           PKGVERSION, version, host_name);
 423 }
 424
 425 static void
 426 gdbreplay_usage (FILE *stream)
 427 {
 428   fprintf (stream, "Usage:\tgdbreplay <logfile> <host:port>\n");
 429   if (REPORT_BUGS_TO[0] && stream == stdout)
 430     fprintf (stream, "Report bugs to \"%s\".\n", REPORT_BUGS_TO);
 431 }
 432
 433 int
 434 main (int argc, char *argv[])
 435 {
 436   FILE *fp;
 437   int ch;
 438
 439   if (argc >= 2 && strcmp (argv[1], "--version") == 0)
 440     {
 441       gdbreplay_version ();
 442       exit (0);
 443     }
 444   if (argc >= 2 && strcmp (argv[1], "--help") == 0)
 445     {
 446       gdbreplay_usage (stdout);
 447       exit (0);
 448     }
 449
 450   if (argc < 3)
 451     {
 452       gdbreplay_usage (stderr);
 453       exit (1);
 454     }
 455   fp = fopen (argv[1], "r");
 456   if (fp == NULL)
 457     {
 458       perror_with_name (argv[1]);
 459     }
 460   remote_open (argv[2]);
 461   while ((ch = logchar (fp)) != EOF)
 462     {
 463       switch (ch)
 464         {
 465         case 'w':
 466           /* data sent from gdb to gdbreplay, accept and match it */
 467           expect (fp);
 468           break;
 469         case 'r':
 470           /* data sent from gdbreplay to gdb, play it */
 471           play (fp);
 472           break;
 473         case 'c':
 474           /* Command executed by gdb */
 475           while ((ch = logchar (fp)) != EOL);
 476           break;
 477         }
 478     }
 479   remote_close ();
 480   exit (0);
 481 }