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_close (void)
 167 {
 168 #ifdef USE_WIN32API
 169   closesocket (remote_desc);
 170 #else
 171   close (remote_desc);
 172 #endif
 173 }
 174
 175 /* Open a connection to a remote debugger.
 176    NAME is the filename used for communication.  */
 177
 178 static void
 179 remote_open (char *name)
 180 {
 181   if (!strchr (name, ':'))
 182     {
 183       fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);
 184       fflush (stderr);
 185       exit (1);
 186     }
 187   else
 188     {
 189 #ifdef USE_WIN32API
 190       static int winsock_initialized;
 191 #endif
 192       char *port_str;
 193       int port;
 194       struct sockaddr_in sockaddr;
 195       socklen_t tmp;
 196       int tmp_desc;
 197
 198       port_str = strchr (name, ':');
 199
 200       port = atoi (port_str + 1);
 201
 202 #ifdef USE_WIN32API
 203       if (!winsock_initialized)
 204         {
 205           WSADATA wsad;
 206
 207           WSAStartup (MAKEWORD (1, 0), &wsad);
 208           winsock_initialized = 1;
 209         }
 210 #endif
 211
 212       tmp_desc = socket (PF_INET, SOCK_STREAM, 0);
 213       if (tmp_desc == -1)
 214         perror_with_name ("Can't open socket");
 215
 216       /* Allow rapid reuse of this port. */
 217       tmp = 1;
 218       setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
 219                   sizeof (tmp));
 220
 221       sockaddr.sin_family = PF_INET;
 222       sockaddr.sin_port = htons (port);
 223       sockaddr.sin_addr.s_addr = INADDR_ANY;
 224
 225       if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr))
 226           || listen (tmp_desc, 1))
 227         perror_with_name ("Can't bind address");
 228
 229       tmp = sizeof (sockaddr);
 230       remote_desc = accept (tmp_desc, (struct sockaddr *) &sockaddr, &tmp);
 231       if (remote_desc == -1)
 232         perror_with_name ("Accept failed");
 233
 234       /* Enable TCP keep alive process. */
 235       tmp = 1;
 236       setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp));
 237
 238       /* Tell TCP not to delay small packets.  This greatly speeds up
 239          interactive response. */
 240       tmp = 1;
 241       setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
 242                   (char *) &tmp, sizeof (tmp));
 243
 244 #ifndef USE_WIN32API
 245       close (tmp_desc);         /* No longer need this */
 246
 247       signal (SIGPIPE, SIG_IGN);        /* If we don't do this, then gdbreplay simply
 248                                            exits when the remote side dies.  */
 249 #else
 250       closesocket (tmp_desc);   /* No longer need this */
 251 #endif
 252     }
 253
 254 #if defined(F_SETFL) && defined (FASYNC)
 255   fcntl (remote_desc, F_SETFL, FASYNC);
 256 #endif
 257
 258   fprintf (stderr, "Replay logfile using %s\n", name);
 259   fflush (stderr);
 260 }
 261
 262 static int
 263 tohex (int ch)
 264 {
 265   if (ch >= '0' && ch <= '9')
 266     {
 267       return (ch - '0');
 268     }
 269   if (ch >= 'A' && ch <= 'F')
 270     {
 271       return (ch - 'A' + 10);
 272     }
 273   if (ch >= 'a' && ch <= 'f')
 274     {
 275       return (ch - 'a' + 10);
 276     }
 277   fprintf (stderr, "\nInvalid hex digit '%c'\n", ch);
 278   fflush (stderr);
 279   exit (1);
 280 }
 281
 282 static int
 283 logchar (FILE *fp)
 284 {
 285   int ch;
 286   int ch2;
 287
 288   ch = fgetc (fp);
 289   fputc (ch, stdout);
 290   fflush (stdout);
 291   switch (ch)
 292     {
 293     case '\n':
 294       ch = EOL;
 295       break;
 296     case '\\':
 297       ch = fgetc (fp);
 298       fputc (ch, stdout);
 299       fflush (stdout);
 300       switch (ch)
 301         {
 302         case '\\':
 303           break;
 304         case 'b':
 305           ch = '\b';
 306           break;
 307         case 'f':
 308           ch = '\f';
 309           break;
 310         case 'n':
 311           ch = '\n';
 312           break;
 313         case 'r':
 314           ch = '\r';
 315           break;
 316         case 't':
 317           ch = '\t';
 318           break;
 319         case 'v':
 320           ch = '\v';
 321           break;
 322         case 'x':
 323           ch2 = fgetc (fp);
 324           fputc (ch2, stdout);
 325           fflush (stdout);
 326           ch = tohex (ch2) << 4;
 327           ch2 = fgetc (fp);
 328           fputc (ch2, stdout);
 329           fflush (stdout);
 330           ch |= tohex (ch2);
 331           break;
 332         default:
 333           /* Treat any other char as just itself */
 334           break;
 335         }
 336     default:
 337       break;
 338     }
 339   return (ch);
 340 }
 341
 342 /* Accept input from gdb and match with chars from fp (after skipping one
 343    blank) up until a \n is read from fp (which is not matched) */
 344
 345 static void
 346 expect (FILE *fp)
 347 {
 348   int fromlog;
 349   unsigned char fromgdb;
 350
 351   if ((fromlog = logchar (fp)) != ' ')
 352     {
 353       sync_error (fp, "Sync error during gdb read of leading blank", ' ',
 354                   fromlog);
 355     }
 356   do
 357     {
 358       fromlog = logchar (fp);
 359       if (fromlog == EOL)
 360         {
 361           break;
 362         }
 363       read (remote_desc, &fromgdb, 1);
 364     }
 365   while (fromlog == fromgdb);
 366   if (fromlog != EOL)
 367     {
 368       sync_error (fp, "Sync error during read of gdb packet", fromlog,
 369                   fromgdb);
 370     }
 371 }
 372
 373 /* Play data back to gdb from fp (after skipping leading blank) up until a
 374    \n is read from fp (which is discarded and not sent to gdb). */
 375
 376 static void
 377 play (FILE *fp)
 378 {
 379   int fromlog;
 380   char ch;
 381
 382   if ((fromlog = logchar (fp)) != ' ')
 383     {
 384       sync_error (fp, "Sync error skipping blank during write to gdb", ' ',
 385                   fromlog);
 386     }
 387   while ((fromlog = logchar (fp)) != EOL)
 388     {
 389       ch = fromlog;
 390       write (remote_desc, &ch, 1);
 391     }
 392 }
 393
 394 static void
 395 gdbreplay_version (void)
 396 {
 397   printf ("GNU gdbreplay %s%s\n"
 398           "Copyright (C) 2010 Free Software Foundation, Inc.\n"
 399           "gdbreplay is free software, covered by the GNU General Public License.\n"
 400           "This gdbreplay was configured as \"%s\"\n",
 401           PKGVERSION, version, host_name);
 402 }
 403
 404 static void
 405 gdbreplay_usage (FILE *stream)
 406 {
 407   fprintf (stream, "Usage:\tgdbreplay <logfile> <host:port>\n");
 408   if (REPORT_BUGS_TO[0] && stream == stdout)
 409     fprintf (stream, "Report bugs to \"%s\".\n", REPORT_BUGS_TO);
 410 }
 411
 412 int
 413 main (int argc, char *argv[])
 414 {
 415   FILE *fp;
 416   int ch;
 417
 418   if (argc >= 2 && strcmp (argv[1], "--version") == 0)
 419     {
 420       gdbreplay_version ();
 421       exit (0);
 422     }
 423   if (argc >= 2 && strcmp (argv[1], "--help") == 0)
 424     {
 425       gdbreplay_usage (stdout);
 426       exit (0);
 427     }
 428
 429   if (argc < 3)
 430     {
 431       gdbreplay_usage (stderr);
 432       exit (1);
 433     }
 434   fp = fopen (argv[1], "r");
 435   if (fp == NULL)
 436     {
 437       perror_with_name (argv[1]);
 438     }
 439   remote_open (argv[2]);
 440   while ((ch = logchar (fp)) != EOF)
 441     {
 442       switch (ch)
 443         {
 444         case 'w':
 445           /* data sent from gdb to gdbreplay, accept and match it */
 446           expect (fp);
 447           break;
 448         case 'r':
 449           /* data sent from gdbreplay to gdb, play it */
 450           play (fp);
 451           break;
 452         case 'c':
 453           /* Command executed by gdb */
 454           while ((ch = logchar (fp)) != EOL);
 455           break;
 456         }
 457     }
 458   remote_close ();
 459   exit (0);
 460 }