gdb/gdbserver/gdbreplay.c

   1 /* Replay a remote debug session logfile for GDB.
   2    Copyright (C) 1996-2015 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 #include "version.h"
  23
  24 #include <stdio.h>
  25 #if HAVE_SYS_FILE_H
  26 #include <sys/file.h>
  27 #endif
  28 #if HAVE_SIGNAL_H
  29 #include <signal.h>
  30 #endif
  31 #include <ctype.h>
  32 #if HAVE_FCNTL_H
  33 #include <fcntl.h>
  34 #endif
  35 #include <errno.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39 #if HAVE_NETDB_H
  40 #include <netdb.h>
  41 #endif
  42 #if HAVE_NETINET_TCP_H
  43 #include <netinet/tcp.h>
  44 #endif
  45 #include "gdb_socket.h"
  46
  47 #include <alloca.h>
  48
  49
  50 #ifndef HAVE_SOCKLEN_T
  51 typedef int socklen_t;
  52 #endif
  53
  54 /* Sort of a hack... */
  55 #define EOL (EOF - 1)
  56
  57 static int remote_desc;
  58
  59 #ifdef __MINGW32CE__
  60
  61 #ifndef COUNTOF
  62 #define COUNTOF(STR) (sizeof (STR) / sizeof ((STR)[0]))
  63 #endif
  64
  65 #define errno (GetLastError ())
  66
  67 char *
  68 strerror (DWORD error)
  69 {
  70   static char buf[1024];
  71   WCHAR *msgbuf;
  72   DWORD lasterr = GetLastError ();
  73   DWORD chars = FormatMessageW (FORMAT_MESSAGE_FROM_SYSTEM
  74                                 | FORMAT_MESSAGE_ALLOCATE_BUFFER,
  75                                 NULL,
  76                                 error,
  77                                 0, /* Default language */
  78                                 (LPVOID)&msgbuf,
  79                                 0,
  80                                 NULL);
  81   if (chars != 0)
  82     {
  83       /* If there is an \r\n appended, zap it.  */
  84       if (chars >= 2
  85           && msgbuf[chars - 2] == '\r'
  86           && msgbuf[chars - 1] == '\n')
  87         {
  88           chars -= 2;
  89           msgbuf[chars] = 0;
  90         }
  91
  92       if (chars > ((COUNTOF (buf)) - 1))
  93         {
  94           chars = COUNTOF (buf) - 1;
  95           msgbuf [chars] = 0;
  96         }
  97
  98       wcstombs (buf, msgbuf, chars + 1);
  99       LocalFree (msgbuf);
 100     }
 101   else
 102     sprintf (buf, "unknown win32 error (%ld)", error);
 103
 104   SetLastError (lasterr);
 105   return buf;
 106 }
 107
 108 #endif /* __MINGW32CE__ */
 109
 110 /* Print the system error message for errno, and also mention STRING
 111    as the file name for which the error was encountered.
 112    Then return to command level.  */
 113
 114 static void
 115 perror_with_name (const char *string)
 116 {
 117 #ifndef STDC_HEADERS
 118   extern int errno;
 119 #endif
 120   const char *err;
 121   char *combined;
 122
 123   err = strerror (errno);
 124   if (err == NULL)
 125     err = "unknown error";
 126
 127   combined = (char *) alloca (strlen (err) + strlen (string) + 3);
 128   strcpy (combined, string);
 129   strcat (combined, ": ");
 130   strcat (combined, err);
 131   fprintf (stderr, "\n%s.\n", combined);
 132   fflush (stderr);
 133   exit (1);
 134 }
 135
 136 static void
 137 sync_error (FILE *fp, char *desc, int expect, int got)
 138 {
 139   fprintf (stderr, "\n%s\n", desc);
 140   fprintf (stderr, "At logfile offset %ld, expected '0x%x' got '0x%x'\n",
 141            ftell (fp), expect, got);
 142   fflush (stderr);
 143   exit (1);
 144 }
 145
 146 static void
 147 remote_error (const char *desc)
 148 {
 149   fprintf (stderr, "\n%s\n", desc);
 150   fflush (stderr);
 151   exit (1);
 152 }
 153
 154 static void
 155 remote_close (void)
 156 {
 157 #ifdef USE_WIN32API
 158   closesocket (remote_desc);
 159 #else
 160   close (remote_desc);
 161 #endif
 162 }
 163
 164 /* Open a connection to a remote debugger.
 165    NAME is the filename used for communication.  */
 166
 167 static void
 168 remote_open (char *name)
 169 {
 170   if (!strchr (name, ':'))
 171     {
 172       fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);
 173       fflush (stderr);
 174       exit (1);
 175     }
 176   else
 177     {
 178 #ifdef USE_WIN32API
 179       static int winsock_initialized;
 180 #endif
 181       char *port_str;
 182       int port;
 183       union gdb_sockaddr_u sockaddr;
 184       socklen_t tmp;
 185       int tmp_desc;
 186
 187       port_str = strchr (name, ':');
 188
 189       port = atoi (port_str + 1);
 190
 191 #ifdef USE_WIN32API
 192       if (!winsock_initialized)
 193         {
 194           WSADATA wsad;
 195
 196           WSAStartup (MAKEWORD (1, 0), &wsad);
 197           winsock_initialized = 1;
 198         }
 199 #endif
 200
 201       tmp_desc = socket (PF_INET, SOCK_STREAM, 0);
 202       if (tmp_desc == -1)
 203         perror_with_name ("Can't open socket");
 204
 205       /* Allow rapid reuse of this port. */
 206       tmp = 1;
 207       setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
 208                   sizeof (tmp));
 209
 210       sockaddr.sa_in.sin_family = PF_INET;
 211       sockaddr.sa_in.sin_port = htons (port);
 212       sockaddr.sa_in.sin_addr.s_addr = INADDR_ANY;
 213
 214       if (bind (tmp_desc, &sockaddr.sa, sizeof (sockaddr.sa_in))
 215           || listen (tmp_desc, 1))
 216         perror_with_name ("Can't bind address");
 217
 218       tmp = sizeof (sockaddr.sa_in);
 219       remote_desc = accept (tmp_desc, &sockaddr.sa, &tmp);
 220       if (remote_desc == -1)
 221         perror_with_name ("Accept failed");
 222
 223       /* Enable TCP keep alive process. */
 224       tmp = 1;
 225       setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE,
 226                   (char *) &tmp, sizeof (tmp));
 227
 228       /* Tell TCP not to delay small packets.  This greatly speeds up
 229          interactive response. */
 230       tmp = 1;
 231       setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
 232                   (char *) &tmp, sizeof (tmp));
 233
 234 #ifndef USE_WIN32API
 235       close (tmp_desc);         /* No longer need this */
 236
 237       signal (SIGPIPE, SIG_IGN);        /* If we don't do this, then
 238                                            gdbreplay simply exits when
 239                                            the remote side dies.  */
 240 #else
 241       closesocket (tmp_desc);   /* No longer need this */
 242 #endif
 243     }
 244
 245 #if defined(F_SETFL) && defined (FASYNC)
 246   fcntl (remote_desc, F_SETFL, FASYNC);
 247 #endif
 248
 249   fprintf (stderr, "Replay logfile using %s\n", name);
 250   fflush (stderr);
 251 }
 252
 253 static int
 254 tohex (int ch)
 255 {
 256   if (ch >= '0' && ch <= '9')
 257     {
 258       return (ch - '0');
 259     }
 260   if (ch >= 'A' && ch <= 'F')
 261     {
 262       return (ch - 'A' + 10);
 263     }
 264   if (ch >= 'a' && ch <= 'f')
 265     {
 266       return (ch - 'a' + 10);
 267     }
 268   fprintf (stderr, "\nInvalid hex digit '%c'\n", ch);
 269   fflush (stderr);
 270   exit (1);
 271 }
 272
 273 static int
 274 logchar (FILE *fp)
 275 {
 276   int ch;
 277   int ch2;
 278
 279   ch = fgetc (fp);
 280   fputc (ch, stdout);
 281   fflush (stdout);
 282   switch (ch)
 283     {
 284     case '\n':
 285       ch = EOL;
 286       break;
 287     case '\\':
 288       ch = fgetc (fp);
 289       fputc (ch, stdout);
 290       fflush (stdout);
 291       switch (ch)
 292         {
 293         case '\\':
 294           break;
 295         case 'b':
 296           ch = '\b';
 297           break;
 298         case 'f':
 299           ch = '\f';
 300           break;
 301         case 'n':
 302           ch = '\n';
 303           break;
 304         case 'r':
 305           ch = '\r';
 306           break;
 307         case 't':
 308           ch = '\t';
 309           break;
 310         case 'v':
 311           ch = '\v';
 312           break;
 313         case 'x':
 314           ch2 = fgetc (fp);
 315           fputc (ch2, stdout);
 316           fflush (stdout);
 317           ch = tohex (ch2) << 4;
 318           ch2 = fgetc (fp);
 319           fputc (ch2, stdout);
 320           fflush (stdout);
 321           ch |= tohex (ch2);
 322           break;
 323         default:
 324           /* Treat any other char as just itself */
 325           break;
 326         }
 327     default:
 328       break;
 329     }
 330   return (ch);
 331 }
 332
 333 static int
 334 gdbchar (int desc)
 335 {
 336   unsigned char fromgdb;
 337
 338   if (read (desc, &fromgdb, 1) != 1)
 339     return -1;
 340   else
 341     return fromgdb;
 342 }
 343
 344 /* Accept input from gdb and match with chars from fp (after skipping one
 345    blank) up until a \n is read from fp (which is not matched) */
 346
 347 static void
 348 expect (FILE *fp)
 349 {
 350   int fromlog;
 351   int fromgdb;
 352
 353   if ((fromlog = logchar (fp)) != ' ')
 354     {
 355       sync_error (fp, "Sync error during gdb read of leading blank", ' ',
 356                   fromlog);
 357     }
 358   do
 359     {
 360       fromlog = logchar (fp);
 361       if (fromlog == EOL)
 362         break;
 363       fromgdb = gdbchar (remote_desc);
 364       if (fromgdb < 0)
 365         remote_error ("Error during read from gdb");
 366     }
 367   while (fromlog == fromgdb);
 368
 369   if (fromlog != EOL)
 370     {
 371       sync_error (fp, "Sync error during read of gdb packet from log", fromlog,
 372                   fromgdb);
 373     }
 374 }
 375
 376 /* Play data back to gdb from fp (after skipping leading blank) up until a
 377    \n is read from fp (which is discarded and not sent to gdb). */
 378
 379 static void
 380 play (FILE *fp)
 381 {
 382   int fromlog;
 383   char ch;
 384
 385   if ((fromlog = logchar (fp)) != ' ')
 386     {
 387       sync_error (fp, "Sync error skipping blank during write to gdb", ' ',
 388                   fromlog);
 389     }
 390   while ((fromlog = logchar (fp)) != EOL)
 391     {
 392       ch = fromlog;
 393       if (write (remote_desc, &ch, 1) != 1)
 394         remote_error ("Error during write to gdb");
 395     }
 396 }
 397
 398 static void
 399 gdbreplay_version (void)
 400 {
 401   printf ("GNU gdbreplay %s%s\n"
 402           "Copyright (C) 2015 Free Software Foundation, Inc.\n"
 403           "gdbreplay is free software, covered by "
 404           "the GNU General Public License.\n"
 405           "This gdbreplay was configured as \"%s\"\n",
 406           PKGVERSION, version, host_name);
 407 }
 408
 409 static void
 410 gdbreplay_usage (FILE *stream)
 411 {
 412   fprintf (stream, "Usage:\tgdbreplay <logfile> <host:port>\n");
 413   if (REPORT_BUGS_TO[0] && stream == stdout)
 414     fprintf (stream, "Report bugs to \"%s\".\n", REPORT_BUGS_TO);
 415 }
 416
 417 int
 418 main (int argc, char *argv[])
 419 {
 420   FILE *fp;
 421   int ch;
 422
 423   if (argc >= 2 && strcmp (argv[1], "--version") == 0)
 424     {
 425       gdbreplay_version ();
 426       exit (0);
 427     }
 428   if (argc >= 2 && strcmp (argv[1], "--help") == 0)
 429     {
 430       gdbreplay_usage (stdout);
 431       exit (0);
 432     }
 433
 434   if (argc < 3)
 435     {
 436       gdbreplay_usage (stderr);
 437       exit (1);
 438     }
 439   fp = fopen (argv[1], "r");
 440   if (fp == NULL)
 441     {
 442       perror_with_name (argv[1]);
 443     }
 444   remote_open (argv[2]);
 445   while ((ch = logchar (fp)) != EOF)
 446     {
 447       switch (ch)
 448         {
 449         case 'w':
 450           /* data sent from gdb to gdbreplay, accept and match it */
 451           expect (fp);
 452           break;
 453         case 'r':
 454           /* data sent from gdbreplay to gdb, play it */
 455           play (fp);
 456           break;
 457         case 'c':
 458           /* Command executed by gdb */
 459           while ((ch = logchar (fp)) != EOL);
 460           break;
 461         }
 462     }
 463   remote_close ();
 464   exit (0);
 465 }