gdb/gdbserver/gdbreplay.c

   1 /* Replay a remote debug session logfile for GDB.
   2    Copyright (C) 1996-2014 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 #if HAVE_ALLOCA_H
  52 #include <alloca.h>
  53 #endif
  54 #if HAVE_MALLOC_H
  55 #include <malloc.h>
  56 #endif
  57 #if USE_WIN32API
  58 #include <winsock2.h>
  59 #endif
  60
  61 #ifndef HAVE_SOCKLEN_T
  62 typedef int socklen_t;
  63 #endif
  64
  65 /* Sort of a hack... */
  66 #define EOL (EOF - 1)
  67
  68 static int remote_desc;
  69
  70 #ifdef __MINGW32CE__
  71
  72 #ifndef COUNTOF
  73 #define COUNTOF(STR) (sizeof (STR) / sizeof ((STR)[0]))
  74 #endif
  75
  76 #define errno (GetLastError ())
  77
  78 char *
  79 strerror (DWORD error)
  80 {
  81   static char buf[1024];
  82   WCHAR *msgbuf;
  83   DWORD lasterr = GetLastError ();
  84   DWORD chars = FormatMessageW (FORMAT_MESSAGE_FROM_SYSTEM
  85                                 | FORMAT_MESSAGE_ALLOCATE_BUFFER,
  86                                 NULL,
  87                                 error,
  88                                 0, /* Default language */
  89                                 (LPVOID)&msgbuf,
  90                                 0,
  91                                 NULL);
  92   if (chars != 0)
  93     {
  94       /* If there is an \r\n appended, zap it.  */
  95       if (chars >= 2
  96           && msgbuf[chars - 2] == '\r'
  97           && msgbuf[chars - 1] == '\n')
  98         {
  99           chars -= 2;
 100           msgbuf[chars] = 0;
 101         }
 102
 103       if (chars > ((COUNTOF (buf)) - 1))
 104         {
 105           chars = COUNTOF (buf) - 1;
 106           msgbuf [chars] = 0;
 107         }
 108
 109       wcstombs (buf, msgbuf, chars + 1);
 110       LocalFree (msgbuf);
 111     }
 112   else
 113     sprintf (buf, "unknown win32 error (%ld)", error);
 114
 115   SetLastError (lasterr);
 116   return buf;
 117 }
 118
 119 #endif /* __MINGW32CE__ */
 120
 121 /* Print the system error message for errno, and also mention STRING
 122    as the file name for which the error was encountered.
 123    Then return to command level.  */
 124
 125 static void
 126 perror_with_name (const char *string)
 127 {
 128 #ifndef STDC_HEADERS
 129   extern int errno;
 130 #endif
 131   const char *err;
 132   char *combined;
 133
 134   err = strerror (errno);
 135   if (err == NULL)
 136     err = "unknown error";
 137
 138   combined = (char *) alloca (strlen (err) + strlen (string) + 3);
 139   strcpy (combined, string);
 140   strcat (combined, ": ");
 141   strcat (combined, err);
 142   fprintf (stderr, "\n%s.\n", combined);
 143   fflush (stderr);
 144   exit (1);
 145 }
 146
 147 static void
 148 sync_error (FILE *fp, char *desc, int expect, int got)
 149 {
 150   fprintf (stderr, "\n%s\n", desc);
 151   fprintf (stderr, "At logfile offset %ld, expected '0x%x' got '0x%x'\n",
 152            ftell (fp), expect, got);
 153   fflush (stderr);
 154   exit (1);
 155 }
 156
 157 static void
 158 remote_error (const char *desc)
 159 {
 160   fprintf (stderr, "\n%s\n", desc);
 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,
 237                   (char *) &tmp, sizeof (tmp));
 238
 239       /* Tell TCP not to delay small packets.  This greatly speeds up
 240          interactive response. */
 241       tmp = 1;
 242       setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
 243                   (char *) &tmp, sizeof (tmp));
 244
 245 #ifndef USE_WIN32API
 246       close (tmp_desc);         /* No longer need this */
 247
 248       signal (SIGPIPE, SIG_IGN);        /* If we don't do this, then
 249                                            gdbreplay simply exits when
 250                                            the remote side dies.  */
 251 #else
 252       closesocket (tmp_desc);   /* No longer need this */
 253 #endif
 254     }
 255
 256 #if defined(F_SETFL) && defined (FASYNC)
 257   fcntl (remote_desc, F_SETFL, FASYNC);
 258 #endif
 259
 260   fprintf (stderr, "Replay logfile using %s\n", name);
 261   fflush (stderr);
 262 }
 263
 264 static int
 265 tohex (int ch)
 266 {
 267   if (ch >= '0' && ch <= '9')
 268     {
 269       return (ch - '0');
 270     }
 271   if (ch >= 'A' && ch <= 'F')
 272     {
 273       return (ch - 'A' + 10);
 274     }
 275   if (ch >= 'a' && ch <= 'f')
 276     {
 277       return (ch - 'a' + 10);
 278     }
 279   fprintf (stderr, "\nInvalid hex digit '%c'\n", ch);
 280   fflush (stderr);
 281   exit (1);
 282 }
 283
 284 static int
 285 logchar (FILE *fp)
 286 {
 287   int ch;
 288   int ch2;
 289
 290   ch = fgetc (fp);
 291   fputc (ch, stdout);
 292   fflush (stdout);
 293   switch (ch)
 294     {
 295     case '\n':
 296       ch = EOL;
 297       break;
 298     case '\\':
 299       ch = fgetc (fp);
 300       fputc (ch, stdout);
 301       fflush (stdout);
 302       switch (ch)
 303         {
 304         case '\\':
 305           break;
 306         case 'b':
 307           ch = '\b';
 308           break;
 309         case 'f':
 310           ch = '\f';
 311           break;
 312         case 'n':
 313           ch = '\n';
 314           break;
 315         case 'r':
 316           ch = '\r';
 317           break;
 318         case 't':
 319           ch = '\t';
 320           break;
 321         case 'v':
 322           ch = '\v';
 323           break;
 324         case 'x':
 325           ch2 = fgetc (fp);
 326           fputc (ch2, stdout);
 327           fflush (stdout);
 328           ch = tohex (ch2) << 4;
 329           ch2 = fgetc (fp);
 330           fputc (ch2, stdout);
 331           fflush (stdout);
 332           ch |= tohex (ch2);
 333           break;
 334         default:
 335           /* Treat any other char as just itself */
 336           break;
 337         }
 338     default:
 339       break;
 340     }
 341   return (ch);
 342 }
 343
 344 static int
 345 gdbchar (int desc)
 346 {
 347   unsigned char fromgdb;
 348
 349   if (read (desc, &fromgdb, 1) != 1)
 350     return -1;
 351   else
 352     return fromgdb;
 353 }
 354
 355 /* Accept input from gdb and match with chars from fp (after skipping one
 356    blank) up until a \n is read from fp (which is not matched) */
 357
 358 static void
 359 expect (FILE *fp)
 360 {
 361   int fromlog;
 362   int fromgdb;
 363
 364   if ((fromlog = logchar (fp)) != ' ')
 365     {
 366       sync_error (fp, "Sync error during gdb read of leading blank", ' ',
 367                   fromlog);
 368     }
 369   do
 370     {
 371       fromlog = logchar (fp);
 372       if (fromlog == EOL)
 373         break;
 374       fromgdb = gdbchar (remote_desc);
 375       if (fromgdb < 0)
 376         remote_error ("Error during read from gdb");
 377     }
 378   while (fromlog == fromgdb);
 379
 380   if (fromlog != EOL)
 381     {
 382       sync_error (fp, "Sync error during read of gdb packet from log", fromlog,
 383                   fromgdb);
 384     }
 385 }
 386
 387 /* Play data back to gdb from fp (after skipping leading blank) up until a
 388    \n is read from fp (which is discarded and not sent to gdb). */
 389
 390 static void
 391 play (FILE *fp)
 392 {
 393   int fromlog;
 394   char ch;
 395
 396   if ((fromlog = logchar (fp)) != ' ')
 397     {
 398       sync_error (fp, "Sync error skipping blank during write to gdb", ' ',
 399                   fromlog);
 400     }
 401   while ((fromlog = logchar (fp)) != EOL)
 402     {
 403       ch = fromlog;
 404       if (write (remote_desc, &ch, 1) != 1)
 405         remote_error ("Error during write to gdb");
 406     }
 407 }
 408
 409 static void
 410 gdbreplay_version (void)
 411 {
 412   printf ("GNU gdbreplay %s%s\n"
 413           "Copyright (C) 2014 Free Software Foundation, Inc.\n"
 414           "gdbreplay is free software, covered by "
 415           "the GNU General Public License.\n"
 416           "This gdbreplay was configured as \"%s\"\n",
 417           PKGVERSION, version, host_name);
 418 }
 419
 420 static void
 421 gdbreplay_usage (FILE *stream)
 422 {
 423   fprintf (stream, "Usage:\tgdbreplay <logfile> <host:port>\n");
 424   if (REPORT_BUGS_TO[0] && stream == stdout)
 425     fprintf (stream, "Report bugs to \"%s\".\n", REPORT_BUGS_TO);
 426 }
 427
 428 int
 429 main (int argc, char *argv[])
 430 {
 431   FILE *fp;
 432   int ch;
 433
 434   if (argc >= 2 && strcmp (argv[1], "--version") == 0)
 435     {
 436       gdbreplay_version ();
 437       exit (0);
 438     }
 439   if (argc >= 2 && strcmp (argv[1], "--help") == 0)
 440     {
 441       gdbreplay_usage (stdout);
 442       exit (0);
 443     }
 444
 445   if (argc < 3)
 446     {
 447       gdbreplay_usage (stderr);
 448       exit (1);
 449     }
 450   fp = fopen (argv[1], "r");
 451   if (fp == NULL)
 452     {
 453       perror_with_name (argv[1]);
 454     }
 455   remote_open (argv[2]);
 456   while ((ch = logchar (fp)) != EOF)
 457     {
 458       switch (ch)
 459         {
 460         case 'w':
 461           /* data sent from gdb to gdbreplay, accept and match it */
 462           expect (fp);
 463           break;
 464         case 'r':
 465           /* data sent from gdbreplay to gdb, play it */
 466           play (fp);
 467           break;
 468         case 'c':
 469           /* Command executed by gdb */
 470           while ((ch = logchar (fp)) != EOL);
 471           break;
 472         }
 473     }
 474   remote_close ();
 475   exit (0);
 476 }