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 #ifdef HAVE_NETINET_IN_H
  40 #include <netinet/in.h>
  41 #endif
  42 #ifdef HAVE_SYS_SOCKET_H
  43 #include <sys/socket.h>
  44 #endif
  45 #if HAVE_NETDB_H
  46 #include <netdb.h>
  47 #endif
  48 #if HAVE_NETINET_TCP_H
  49 #include <netinet/tcp.h>
  50 #endif
  51
  52 #include <alloca.h>
  53
  54 #if USE_WIN32API
  55 #include <winsock2.h>
  56 #endif
  57
  58 #ifndef HAVE_SOCKLEN_T
  59 typedef int socklen_t;
  60 #endif
  61
  62 /* Sort of a hack... */
  63 #define EOL (EOF - 1)
  64
  65 static int remote_desc;
  66
  67 #ifdef __MINGW32CE__
  68
  69 #ifndef COUNTOF
  70 #define COUNTOF(STR) (sizeof (STR) / sizeof ((STR)[0]))
  71 #endif
  72
  73 #define errno (GetLastError ())
  74
  75 char *
  76 strerror (DWORD error)
  77 {
  78   static char buf[1024];
  79   WCHAR *msgbuf;
  80   DWORD lasterr = GetLastError ();
  81   DWORD chars = FormatMessageW (FORMAT_MESSAGE_FROM_SYSTEM
  82                                 | FORMAT_MESSAGE_ALLOCATE_BUFFER,
  83                                 NULL,
  84                                 error,
  85                                 0, /* Default language */
  86                                 (LPVOID)&msgbuf,
  87                                 0,
  88                                 NULL);
  89   if (chars != 0)
  90     {
  91       /* If there is an \r\n appended, zap it.  */
  92       if (chars >= 2
  93           && msgbuf[chars - 2] == '\r'
  94           && msgbuf[chars - 1] == '\n')
  95         {
  96           chars -= 2;
  97           msgbuf[chars] = 0;
  98         }
  99
 100       if (chars > ((COUNTOF (buf)) - 1))
 101         {
 102           chars = COUNTOF (buf) - 1;
 103           msgbuf [chars] = 0;
 104         }
 105
 106       wcstombs (buf, msgbuf, chars + 1);
 107       LocalFree (msgbuf);
 108     }
 109   else
 110     sprintf (buf, "unknown win32 error (%ld)", error);
 111
 112   SetLastError (lasterr);
 113   return buf;
 114 }
 115
 116 #endif /* __MINGW32CE__ */
 117
 118 /* Print the system error message for errno, and also mention STRING
 119    as the file name for which the error was encountered.
 120    Then return to command level.  */
 121
 122 static void
 123 perror_with_name (const char *string)
 124 {
 125 #ifndef STDC_HEADERS
 126   extern int errno;
 127 #endif
 128   const char *err;
 129   char *combined;
 130
 131   err = strerror (errno);
 132   if (err == NULL)
 133     err = "unknown error";
 134
 135   combined = (char *) alloca (strlen (err) + strlen (string) + 3);
 136   strcpy (combined, string);
 137   strcat (combined, ": ");
 138   strcat (combined, err);
 139   fprintf (stderr, "\n%s.\n", combined);
 140   fflush (stderr);
 141   exit (1);
 142 }
 143
 144 static void
 145 sync_error (FILE *fp, char *desc, int expect, int got)
 146 {
 147   fprintf (stderr, "\n%s\n", desc);
 148   fprintf (stderr, "At logfile offset %ld, expected '0x%x' got '0x%x'\n",
 149            ftell (fp), expect, got);
 150   fflush (stderr);
 151   exit (1);
 152 }
 153
 154 static void
 155 remote_error (const char *desc)
 156 {
 157   fprintf (stderr, "\n%s\n", desc);
 158   fflush (stderr);
 159   exit (1);
 160 }
 161
 162 static void
 163 remote_close (void)
 164 {
 165 #ifdef USE_WIN32API
 166   closesocket (remote_desc);
 167 #else
 168   close (remote_desc);
 169 #endif
 170 }
 171
 172 /* Open a connection to a remote debugger.
 173    NAME is the filename used for communication.  */
 174
 175 static void
 176 remote_open (char *name)
 177 {
 178   if (!strchr (name, ':'))
 179     {
 180       fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);
 181       fflush (stderr);
 182       exit (1);
 183     }
 184   else
 185     {
 186 #ifdef USE_WIN32API
 187       static int winsock_initialized;
 188 #endif
 189       char *port_str;
 190       int port;
 191       struct sockaddr_in sockaddr;
 192       socklen_t tmp;
 193       int tmp_desc;
 194
 195       port_str = strchr (name, ':');
 196
 197       port = atoi (port_str + 1);
 198
 199 #ifdef USE_WIN32API
 200       if (!winsock_initialized)
 201         {
 202           WSADATA wsad;
 203
 204           WSAStartup (MAKEWORD (1, 0), &wsad);
 205           winsock_initialized = 1;
 206         }
 207 #endif
 208
 209       tmp_desc = socket (PF_INET, SOCK_STREAM, 0);
 210       if (tmp_desc == -1)
 211         perror_with_name ("Can't open socket");
 212
 213       /* Allow rapid reuse of this port. */
 214       tmp = 1;
 215       setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
 216                   sizeof (tmp));
 217
 218       sockaddr.sin_family = PF_INET;
 219       sockaddr.sin_port = htons (port);
 220       sockaddr.sin_addr.s_addr = INADDR_ANY;
 221
 222       if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr))
 223           || listen (tmp_desc, 1))
 224         perror_with_name ("Can't bind address");
 225
 226       tmp = sizeof (sockaddr);
 227       remote_desc = accept (tmp_desc, (struct sockaddr *) &sockaddr, &tmp);
 228       if (remote_desc == -1)
 229         perror_with_name ("Accept failed");
 230
 231       /* Enable TCP keep alive process. */
 232       tmp = 1;
 233       setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE,
 234                   (char *) &tmp, sizeof (tmp));
 235
 236       /* Tell TCP not to delay small packets.  This greatly speeds up
 237          interactive response. */
 238       tmp = 1;
 239       setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
 240                   (char *) &tmp, sizeof (tmp));
 241
 242 #ifndef USE_WIN32API
 243       close (tmp_desc);         /* No longer need this */
 244
 245       signal (SIGPIPE, SIG_IGN);        /* If we don't do this, then
 246                                            gdbreplay simply exits when
 247                                            the remote side dies.  */
 248 #else
 249       closesocket (tmp_desc);   /* No longer need this */
 250 #endif
 251     }
 252
 253 #if defined(F_SETFL) && defined (FASYNC)
 254   fcntl (remote_desc, F_SETFL, FASYNC);
 255 #endif
 256
 257   fprintf (stderr, "Replay logfile using %s\n", name);
 258   fflush (stderr);
 259 }
 260
 261 static int
 262 fromhex (int ch)
 263 {
 264   if (ch >= '0' && ch <= '9')
 265     {
 266       return (ch - '0');
 267     }
 268   if (ch >= 'A' && ch <= 'F')
 269     {
 270       return (ch - 'A' + 10);
 271     }
 272   if (ch >= 'a' && ch <= 'f')
 273     {
 274       return (ch - 'a' + 10);
 275     }
 276   fprintf (stderr, "\nInvalid hex digit '%c'\n", ch);
 277   fflush (stderr);
 278   exit (1);
 279 }
 280
 281 static int
 282 logchar (FILE *fp)
 283 {
 284   int ch;
 285   int ch2;
 286
 287   ch = fgetc (fp);
 288   fputc (ch, stdout);
 289   fflush (stdout);
 290   switch (ch)
 291     {
 292     case '\n':
 293       ch = EOL;
 294       break;
 295     case '\\':
 296       ch = fgetc (fp);
 297       fputc (ch, stdout);
 298       fflush (stdout);
 299       switch (ch)
 300         {
 301         case '\\':
 302           break;
 303         case 'b':
 304           ch = '\b';
 305           break;
 306         case 'f':
 307           ch = '\f';
 308           break;
 309         case 'n':
 310           ch = '\n';
 311           break;
 312         case 'r':
 313           ch = '\r';
 314           break;
 315         case 't':
 316           ch = '\t';
 317           break;
 318         case 'v':
 319           ch = '\v';
 320           break;
 321         case 'x':
 322           ch2 = fgetc (fp);
 323           fputc (ch2, stdout);
 324           fflush (stdout);
 325           ch = fromhex (ch2) << 4;
 326           ch2 = fgetc (fp);
 327           fputc (ch2, stdout);
 328           fflush (stdout);
 329           ch |= fromhex (ch2);
 330           break;
 331         default:
 332           /* Treat any other char as just itself */
 333           break;
 334         }
 335     default:
 336       break;
 337     }
 338   return (ch);
 339 }
 340
 341 static int
 342 gdbchar (int desc)
 343 {
 344   unsigned char fromgdb;
 345
 346   if (read (desc, &fromgdb, 1) != 1)
 347     return -1;
 348   else
 349     return fromgdb;
 350 }
 351
 352 /* Accept input from gdb and match with chars from fp (after skipping one
 353    blank) up until a \n is read from fp (which is not matched) */
 354
 355 static void
 356 expect (FILE *fp)
 357 {
 358   int fromlog;
 359   int fromgdb;
 360
 361   if ((fromlog = logchar (fp)) != ' ')
 362     {
 363       sync_error (fp, "Sync error during gdb read of leading blank", ' ',
 364                   fromlog);
 365     }
 366   do
 367     {
 368       fromlog = logchar (fp);
 369       if (fromlog == EOL)
 370         break;
 371       fromgdb = gdbchar (remote_desc);
 372       if (fromgdb < 0)
 373         remote_error ("Error during read from gdb");
 374     }
 375   while (fromlog == fromgdb);
 376
 377   if (fromlog != EOL)
 378     {
 379       sync_error (fp, "Sync error during read of gdb packet from log", fromlog,
 380                   fromgdb);
 381     }
 382 }
 383
 384 /* Play data back to gdb from fp (after skipping leading blank) up until a
 385    \n is read from fp (which is discarded and not sent to gdb). */
 386
 387 static void
 388 play (FILE *fp)
 389 {
 390   int fromlog;
 391   char ch;
 392
 393   if ((fromlog = logchar (fp)) != ' ')
 394     {
 395       sync_error (fp, "Sync error skipping blank during write to gdb", ' ',
 396                   fromlog);
 397     }
 398   while ((fromlog = logchar (fp)) != EOL)
 399     {
 400       ch = fromlog;
 401       if (write (remote_desc, &ch, 1) != 1)
 402         remote_error ("Error during write to gdb");
 403     }
 404 }
 405
 406 static void
 407 gdbreplay_version (void)
 408 {
 409   printf ("GNU gdbreplay %s%s\n"
 410           "Copyright (C) 2015 Free Software Foundation, Inc.\n"
 411           "gdbreplay is free software, covered by "
 412           "the GNU General Public License.\n"
 413           "This gdbreplay was configured as \"%s\"\n",
 414           PKGVERSION, version, host_name);
 415 }
 416
 417 static void
 418 gdbreplay_usage (FILE *stream)
 419 {
 420   fprintf (stream, "Usage:\tgdbreplay <logfile> <host:port>\n");
 421   if (REPORT_BUGS_TO[0] && stream == stdout)
 422     fprintf (stream, "Report bugs to \"%s\".\n", REPORT_BUGS_TO);
 423 }
 424
 425 int
 426 main (int argc, char *argv[])
 427 {
 428   FILE *fp;
 429   int ch;
 430
 431   if (argc >= 2 && strcmp (argv[1], "--version") == 0)
 432     {
 433       gdbreplay_version ();
 434       exit (0);
 435     }
 436   if (argc >= 2 && strcmp (argv[1], "--help") == 0)
 437     {
 438       gdbreplay_usage (stdout);
 439       exit (0);
 440     }
 441
 442   if (argc < 3)
 443     {
 444       gdbreplay_usage (stderr);
 445       exit (1);
 446     }
 447   fp = fopen (argv[1], "r");
 448   if (fp == NULL)
 449     {
 450       perror_with_name (argv[1]);
 451     }
 452   remote_open (argv[2]);
 453   while ((ch = logchar (fp)) != EOF)
 454     {
 455       switch (ch)
 456         {
 457         case 'w':
 458           /* data sent from gdb to gdbreplay, accept and match it */
 459           expect (fp);
 460           break;
 461         case 'r':
 462           /* data sent from gdbreplay to gdb, play it */
 463           play (fp);
 464           break;
 465         case 'c':
 466           /* Command executed by gdb */
 467           while ((ch = logchar (fp)) != EOL);
 468           break;
 469         }
 470     }
 471   remote_close ();
 472   exit (0);
 473 }