gdb/gdbserver/gdbreplay.c

   1 /* Replay a remote debug session logfile for GDB.
   2    Copyright (C) 1996-2013 Free Software Foundation, Inc.
   3    Written by Fred Fish (fnf@cygnus.com) from pieces of gdbserver.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include "build-gnulib-gdbserver/config.h"
  22
  23 #include <stdio.h>
  24 #if HAVE_SYS_FILE_H
  25 #include <sys/file.h>
  26 #endif
  27 #if HAVE_SIGNAL_H
  28 #include <signal.h>
  29 #endif
  30 #include <ctype.h>
  31 #if HAVE_FCNTL_H
  32 #include <fcntl.h>
  33 #endif
  34 #if HAVE_ERRNO_H
  35 #include <errno.h>
  36 #endif
  37 #ifdef HAVE_STDLIB_H
  38 #include <stdlib.h>
  39 #endif
  40 #ifdef HAVE_STRING_H
  41 #include <string.h>
  42 #endif
  43 #ifdef HAVE_UNISTD_H
  44 #include <unistd.h>
  45 #endif
  46 #ifdef HAVE_NETINET_IN_H
  47 #include <netinet/in.h>
  48 #endif
  49 #ifdef HAVE_SYS_SOCKET_H
  50 #include <sys/socket.h>
  51 #endif
  52 #if HAVE_NETDB_H
  53 #include <netdb.h>
  54 #endif
  55 #if HAVE_NETINET_TCP_H
  56 #include <netinet/tcp.h>
  57 #endif
  58 #if HAVE_ALLOCA_H
  59 #include <alloca.h>
  60 #endif
  61 #if HAVE_MALLOC_H
  62 #include <malloc.h>
  63 #endif
  64 #if USE_WIN32API
  65 #include <winsock2.h>
  66 #endif
  67
  68 #ifndef HAVE_SOCKLEN_T
  69 typedef int socklen_t;
  70 #endif
  71
  72 /* Sort of a hack... */
  73 #define EOL (EOF - 1)
  74
  75 /* Version information, from version.c.  */
  76 extern const char version[];
  77 extern const char host_name[];
  78
  79 static int remote_desc;
  80
  81 #ifdef __MINGW32CE__
  82
  83 #ifndef COUNTOF
  84 #define COUNTOF(STR) (sizeof (STR) / sizeof ((STR)[0]))
  85 #endif
  86
  87 #define errno (GetLastError ())
  88
  89 char *
  90 strerror (DWORD error)
  91 {
  92   static char buf[1024];
  93   WCHAR *msgbuf;
  94   DWORD lasterr = GetLastError ();
  95   DWORD chars = FormatMessageW (FORMAT_MESSAGE_FROM_SYSTEM
  96                                 | FORMAT_MESSAGE_ALLOCATE_BUFFER,
  97                                 NULL,
  98                                 error,
  99                                 0, /* Default language */
 100                                 (LPVOID)&msgbuf,
 101                                 0,
 102                                 NULL);
 103   if (chars != 0)
 104     {
 105       /* If there is an \r\n appended, zap it.  */
 106       if (chars >= 2
 107           && msgbuf[chars - 2] == '\r'
 108           && msgbuf[chars - 1] == '\n')
 109         {
 110           chars -= 2;
 111           msgbuf[chars] = 0;
 112         }
 113
 114       if (chars > ((COUNTOF (buf)) - 1))
 115         {
 116           chars = COUNTOF (buf) - 1;
 117           msgbuf [chars] = 0;
 118         }
 119
 120       wcstombs (buf, msgbuf, chars + 1);
 121       LocalFree (msgbuf);
 122     }
 123   else
 124     sprintf (buf, "unknown win32 error (%ld)", error);
 125
 126   SetLastError (lasterr);
 127   return buf;
 128 }
 129
 130 #endif /* __MINGW32CE__ */
 131
 132 /* Print the system error message for errno, and also mention STRING
 133    as the file name for which the error was encountered.
 134    Then return to command level.  */
 135
 136 static void
 137 perror_with_name (const char *string)
 138 {
 139 #ifndef STDC_HEADERS
 140   extern int errno;
 141 #endif
 142   const char *err;
 143   char *combined;
 144
 145   err = strerror (errno);
 146   if (err == NULL)
 147     err = "unknown error";
 148
 149   combined = (char *) alloca (strlen (err) + strlen (string) + 3);
 150   strcpy (combined, string);
 151   strcat (combined, ": ");
 152   strcat (combined, err);
 153   fprintf (stderr, "\n%s.\n", combined);
 154   fflush (stderr);
 155   exit (1);
 156 }
 157
 158 static void
 159 sync_error (FILE *fp, char *desc, int expect, int got)
 160 {
 161   fprintf (stderr, "\n%s\n", desc);
 162   fprintf (stderr, "At logfile offset %ld, expected '0x%x' got '0x%x'\n",
 163            ftell (fp), expect, got);
 164   fflush (stderr);
 165   exit (1);
 166 }
 167
 168 static void
 169 remote_error (const char *desc)
 170 {
 171   fprintf (stderr, "\n%s\n", desc);
 172   fflush (stderr);
 173   exit (1);
 174 }
 175
 176 static void
 177 remote_close (void)
 178 {
 179 #ifdef USE_WIN32API
 180   closesocket (remote_desc);
 181 #else
 182   close (remote_desc);
 183 #endif
 184 }
 185
 186 /* Open a connection to a remote debugger.
 187    NAME is the filename used for communication.  */
 188
 189 static void
 190 remote_open (char *name)
 191 {
 192   if (!strchr (name, ':'))
 193     {
 194       fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);
 195       fflush (stderr);
 196       exit (1);
 197     }
 198   else
 199     {
 200 #ifdef USE_WIN32API
 201       static int winsock_initialized;
 202 #endif
 203       char *port_str;
 204       int port;
 205       struct sockaddr_in sockaddr;
 206       socklen_t tmp;
 207       int tmp_desc;
 208
 209       port_str = strchr (name, ':');
 210
 211       port = atoi (port_str + 1);
 212
 213 #ifdef USE_WIN32API
 214       if (!winsock_initialized)
 215         {
 216           WSADATA wsad;
 217
 218           WSAStartup (MAKEWORD (1, 0), &wsad);
 219           winsock_initialized = 1;
 220         }
 221 #endif
 222
 223       tmp_desc = socket (PF_INET, SOCK_STREAM, 0);
 224       if (tmp_desc == -1)
 225         perror_with_name ("Can't open socket");
 226
 227       /* Allow rapid reuse of this port. */
 228       tmp = 1;
 229       setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
 230                   sizeof (tmp));
 231
 232       sockaddr.sin_family = PF_INET;
 233       sockaddr.sin_port = htons (port);
 234       sockaddr.sin_addr.s_addr = INADDR_ANY;
 235
 236       if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr))
 237           || listen (tmp_desc, 1))
 238         perror_with_name ("Can't bind address");
 239
 240       tmp = sizeof (sockaddr);
 241       remote_desc = accept (tmp_desc, (struct sockaddr *) &sockaddr, &tmp);
 242       if (remote_desc == -1)
 243         perror_with_name ("Accept failed");
 244
 245       /* Enable TCP keep alive process. */
 246       tmp = 1;
 247       setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE,
 248                   (char *) &tmp, sizeof (tmp));
 249
 250       /* Tell TCP not to delay small packets.  This greatly speeds up
 251          interactive response. */
 252       tmp = 1;
 253       setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
 254                   (char *) &tmp, sizeof (tmp));
 255
 256 #ifndef USE_WIN32API
 257       close (tmp_desc);         /* No longer need this */
 258
 259       signal (SIGPIPE, SIG_IGN);        /* If we don't do this, then
 260                                            gdbreplay simply exits when
 261                                            the remote side dies.  */
 262 #else
 263       closesocket (tmp_desc);   /* No longer need this */
 264 #endif
 265     }
 266
 267 #if defined(F_SETFL) && defined (FASYNC)
 268   fcntl (remote_desc, F_SETFL, FASYNC);
 269 #endif
 270
 271   fprintf (stderr, "Replay logfile using %s\n", name);
 272   fflush (stderr);
 273 }
 274
 275 static int
 276 tohex (int ch)
 277 {
 278   if (ch >= '0' && ch <= '9')
 279     {
 280       return (ch - '0');
 281     }
 282   if (ch >= 'A' && ch <= 'F')
 283     {
 284       return (ch - 'A' + 10);
 285     }
 286   if (ch >= 'a' && ch <= 'f')
 287     {
 288       return (ch - 'a' + 10);
 289     }
 290   fprintf (stderr, "\nInvalid hex digit '%c'\n", ch);
 291   fflush (stderr);
 292   exit (1);
 293 }
 294
 295 static int
 296 logchar (FILE *fp)
 297 {
 298   int ch;
 299   int ch2;
 300
 301   ch = fgetc (fp);
 302   fputc (ch, stdout);
 303   fflush (stdout);
 304   switch (ch)
 305     {
 306     case '\n':
 307       ch = EOL;
 308       break;
 309     case '\\':
 310       ch = fgetc (fp);
 311       fputc (ch, stdout);
 312       fflush (stdout);
 313       switch (ch)
 314         {
 315         case '\\':
 316           break;
 317         case 'b':
 318           ch = '\b';
 319           break;
 320         case 'f':
 321           ch = '\f';
 322           break;
 323         case 'n':
 324           ch = '\n';
 325           break;
 326         case 'r':
 327           ch = '\r';
 328           break;
 329         case 't':
 330           ch = '\t';
 331           break;
 332         case 'v':
 333           ch = '\v';
 334           break;
 335         case 'x':
 336           ch2 = fgetc (fp);
 337           fputc (ch2, stdout);
 338           fflush (stdout);
 339           ch = tohex (ch2) << 4;
 340           ch2 = fgetc (fp);
 341           fputc (ch2, stdout);
 342           fflush (stdout);
 343           ch |= tohex (ch2);
 344           break;
 345         default:
 346           /* Treat any other char as just itself */
 347           break;
 348         }
 349     default:
 350       break;
 351     }
 352   return (ch);
 353 }
 354
 355 static int
 356 gdbchar (int desc)
 357 {
 358   unsigned char fromgdb;
 359
 360   if (read (desc, &fromgdb, 1) != 1)
 361     return -1;
 362   else
 363     return fromgdb;
 364 }
 365
 366 /* Accept input from gdb and match with chars from fp (after skipping one
 367    blank) up until a \n is read from fp (which is not matched) */
 368
 369 static void
 370 expect (FILE *fp)
 371 {
 372   int fromlog;
 373   int fromgdb;
 374
 375   if ((fromlog = logchar (fp)) != ' ')
 376     {
 377       sync_error (fp, "Sync error during gdb read of leading blank", ' ',
 378                   fromlog);
 379     }
 380   do
 381     {
 382       fromlog = logchar (fp);
 383       if (fromlog == EOL)
 384         break;
 385       fromgdb = gdbchar (remote_desc);
 386       if (fromgdb < 0)
 387         remote_error ("Error during read from gdb");
 388     }
 389   while (fromlog == fromgdb);
 390
 391   if (fromlog != EOL)
 392     {
 393       sync_error (fp, "Sync error during read of gdb packet from log", fromlog,
 394                   fromgdb);
 395     }
 396 }
 397
 398 /* Play data back to gdb from fp (after skipping leading blank) up until a
 399    \n is read from fp (which is discarded and not sent to gdb). */
 400
 401 static void
 402 play (FILE *fp)
 403 {
 404   int fromlog;
 405   char ch;
 406
 407   if ((fromlog = logchar (fp)) != ' ')
 408     {
 409       sync_error (fp, "Sync error skipping blank during write to gdb", ' ',
 410                   fromlog);
 411     }
 412   while ((fromlog = logchar (fp)) != EOL)
 413     {
 414       ch = fromlog;
 415       if (write (remote_desc, &ch, 1) != 1)
 416         remote_error ("Error during write to gdb");
 417     }
 418 }
 419
 420 static void
 421 gdbreplay_version (void)
 422 {
 423   printf ("GNU gdbreplay %s%s\n"
 424           "Copyright (C) 2013 Free Software Foundation, Inc.\n"
 425           "gdbreplay is free software, covered by "
 426           "the GNU General Public License.\n"
 427           "This gdbreplay was configured as \"%s\"\n",
 428           PKGVERSION, version, host_name);
 429 }
 430
 431 static void
 432 gdbreplay_usage (FILE *stream)
 433 {
 434   fprintf (stream, "Usage:\tgdbreplay <logfile> <host:port>\n");
 435   if (REPORT_BUGS_TO[0] && stream == stdout)
 436     fprintf (stream, "Report bugs to \"%s\".\n", REPORT_BUGS_TO);
 437 }
 438
 439 int
 440 main (int argc, char *argv[])
 441 {
 442   FILE *fp;
 443   int ch;
 444
 445   if (argc >= 2 && strcmp (argv[1], "--version") == 0)
 446     {
 447       gdbreplay_version ();
 448       exit (0);
 449     }
 450   if (argc >= 2 && strcmp (argv[1], "--help") == 0)
 451     {
 452       gdbreplay_usage (stdout);
 453       exit (0);
 454     }
 455
 456   if (argc < 3)
 457     {
 458       gdbreplay_usage (stderr);
 459       exit (1);
 460     }
 461   fp = fopen (argv[1], "r");
 462   if (fp == NULL)
 463     {
 464       perror_with_name (argv[1]);
 465     }
 466   remote_open (argv[2]);
 467   while ((ch = logchar (fp)) != EOF)
 468     {
 469       switch (ch)
 470         {
 471         case 'w':
 472           /* data sent from gdb to gdbreplay, accept and match it */
 473           expect (fp);
 474           break;
 475         case 'r':
 476           /* data sent from gdbreplay to gdb, play it */
 477           play (fp);
 478           break;
 479         case 'c':
 480           /* Command executed by gdb */
 481           while ((ch = logchar (fp)) != EOL);
 482           break;
 483         }
 484     }
 485   remote_close ();
 486   exit (0);
 487 }