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
   3    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 2 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, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 #include "config.h"
  24 #include <stdio.h>
  25 #include <sys/file.h>
  26 #include <signal.h>
  27 #include <ctype.h>
  28 #include <fcntl.h>
  29 #include <errno.h>
  30
  31 #ifdef HAVE_STDLIB_H
  32 #include <stdlib.h>
  33 #endif
  34 #ifdef HAVE_STRING_H
  35 #include <string.h>
  36 #endif
  37 #ifdef HAVE_UNISTD_H
  38 #include <unistd.h>
  39 #endif
  40 #ifdef HAVE_NETINET_IN_H
  41 #include <netinet/in.h>
  42 #endif
  43 #ifdef HAVE_SYS_SOCKET_H
  44 #include <sys/socket.h>
  45 #endif
  46 #if HAVE_NETDB_H
  47 #include <netdb.h>
  48 #endif
  49 #if HAVE_NETINET_TCP_H
  50 #include <netinet/tcp.h>
  51 #endif
  52
  53 #if USE_WIN32API
  54 #include <winsock.h>
  55 #endif
  56
  57 #ifndef HAVE_SOCKLEN_T
  58 typedef int socklen_t;
  59 #endif
  60
  61 /* Sort of a hack... */
  62 #define EOL (EOF - 1)
  63
  64 static int remote_desc;
  65
  66 /* Print the system error message for errno, and also mention STRING
  67    as the file name for which the error was encountered.
  68    Then return to command level.  */
  69
  70 static void
  71 perror_with_name (char *string)
  72 {
  73 #ifndef STDC_HEADERS
  74   extern int errno;
  75 #endif
  76   const char *err;
  77   char *combined;
  78
  79   err = strerror (errno);
  80   if (err == NULL)
  81     err = "unknown error";
  82
  83   combined = (char *) alloca (strlen (err) + strlen (string) + 3);
  84   strcpy (combined, string);
  85   strcat (combined, ": ");
  86   strcat (combined, err);
  87   fprintf (stderr, "\n%s.\n", combined);
  88   fflush (stderr);
  89   exit (1);
  90 }
  91
  92 static void
  93 sync_error (FILE *fp, char *desc, int expect, int got)
  94 {
  95   fprintf (stderr, "\n%s\n", desc);
  96   fprintf (stderr, "At logfile offset %ld, expected '0x%x' got '0x%x'\n",
  97            ftell (fp), expect, got);
  98   fflush (stderr);
  99   exit (1);
 100 }
 101
 102 static void
 103 remote_close (void)
 104 {
 105 #ifdef USE_WIN32API
 106   closesocket (remote_desc);
 107 #else
 108   close (remote_desc);
 109 #endif
 110 }
 111
 112 /* Open a connection to a remote debugger.
 113    NAME is the filename used for communication.  */
 114
 115 static void
 116 remote_open (char *name)
 117 {
 118   if (!strchr (name, ':'))
 119     {
 120       fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);
 121       fflush (stderr);
 122       exit (1);
 123     }
 124   else
 125     {
 126 #ifdef USE_WIN32API
 127       static int winsock_initialized;
 128 #endif
 129       char *port_str;
 130       int port;
 131       struct sockaddr_in sockaddr;
 132       socklen_t tmp;
 133       int tmp_desc;
 134
 135       port_str = strchr (name, ':');
 136
 137       port = atoi (port_str + 1);
 138
 139 #ifdef USE_WIN32API
 140       if (!winsock_initialized)
 141         {
 142           WSADATA wsad;
 143
 144           WSAStartup (MAKEWORD (1, 0), &wsad);
 145           winsock_initialized = 1;
 146         }
 147 #endif
 148
 149       tmp_desc = socket (PF_INET, SOCK_STREAM, 0);
 150       if (tmp_desc < 0)
 151         perror_with_name ("Can't open socket");
 152
 153       /* Allow rapid reuse of this port. */
 154       tmp = 1;
 155       setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
 156                   sizeof (tmp));
 157
 158       sockaddr.sin_family = PF_INET;
 159       sockaddr.sin_port = htons (port);
 160       sockaddr.sin_addr.s_addr = INADDR_ANY;
 161
 162       if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr))
 163           || listen (tmp_desc, 1))
 164         perror_with_name ("Can't bind address");
 165
 166       tmp = sizeof (sockaddr);
 167       remote_desc = accept (tmp_desc, (struct sockaddr *) &sockaddr, &tmp);
 168       if (remote_desc == -1)
 169         perror_with_name ("Accept failed");
 170
 171       /* Enable TCP keep alive process. */
 172       tmp = 1;
 173       setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp));
 174
 175       /* Tell TCP not to delay small packets.  This greatly speeds up
 176          interactive response. */
 177       tmp = 1;
 178       setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
 179                   (char *) &tmp, sizeof (tmp));
 180
 181       close (tmp_desc);         /* No longer need this */
 182
 183 #ifndef USE_WIN32API
 184       close (tmp_desc);         /* No longer need this */
 185
 186       signal (SIGPIPE, SIG_IGN);        /* If we don't do this, then gdbreplay simply
 187                                            exits when the remote side dies.  */
 188 #else
 189       closesocket (tmp_desc);   /* No longer need this */
 190 #endif
 191     }
 192
 193 #if defined(F_SETFL) && defined (FASYNC)
 194   fcntl (remote_desc, F_SETFL, FASYNC);
 195 #endif
 196
 197   fprintf (stderr, "Replay logfile using %s\n", name);
 198   fflush (stderr);
 199 }
 200
 201 static int
 202 tohex (int ch)
 203 {
 204   if (ch >= '0' && ch <= '9')
 205     {
 206       return (ch - '0');
 207     }
 208   if (ch >= 'A' && ch <= 'F')
 209     {
 210       return (ch - 'A' + 10);
 211     }
 212   if (ch >= 'a' && ch <= 'f')
 213     {
 214       return (ch - 'a' + 10);
 215     }
 216   fprintf (stderr, "\nInvalid hex digit '%c'\n", ch);
 217   fflush (stderr);
 218   exit (1);
 219 }
 220
 221 static int
 222 logchar (FILE *fp)
 223 {
 224   int ch;
 225   int ch2;
 226
 227   ch = fgetc (fp);
 228   fputc (ch, stdout);
 229   fflush (stdout);
 230   switch (ch)
 231     {
 232     case '\n':
 233       ch = EOL;
 234       break;
 235     case '\\':
 236       ch = fgetc (fp);
 237       fputc (ch, stdout);
 238       fflush (stdout);
 239       switch (ch)
 240         {
 241         case '\\':
 242           break;
 243         case 'b':
 244           ch = '\b';
 245           break;
 246         case 'f':
 247           ch = '\f';
 248           break;
 249         case 'n':
 250           ch = '\n';
 251           break;
 252         case 'r':
 253           ch = '\r';
 254           break;
 255         case 't':
 256           ch = '\t';
 257           break;
 258         case 'v':
 259           ch = '\v';
 260           break;
 261         case 'x':
 262           ch2 = fgetc (fp);
 263           fputc (ch2, stdout);
 264           fflush (stdout);
 265           ch = tohex (ch2) << 4;
 266           ch2 = fgetc (fp);
 267           fputc (ch2, stdout);
 268           fflush (stdout);
 269           ch |= tohex (ch2);
 270           break;
 271         default:
 272           /* Treat any other char as just itself */
 273           break;
 274         }
 275     default:
 276       break;
 277     }
 278   return (ch);
 279 }
 280
 281 /* Accept input from gdb and match with chars from fp (after skipping one
 282    blank) up until a \n is read from fp (which is not matched) */
 283
 284 static void
 285 expect (FILE *fp)
 286 {
 287   int fromlog;
 288   unsigned char fromgdb;
 289
 290   if ((fromlog = logchar (fp)) != ' ')
 291     {
 292       sync_error (fp, "Sync error during gdb read of leading blank", ' ',
 293                   fromlog);
 294     }
 295   do
 296     {
 297       fromlog = logchar (fp);
 298       if (fromlog == EOL)
 299         {
 300           break;
 301         }
 302       read (remote_desc, &fromgdb, 1);
 303     }
 304   while (fromlog == fromgdb);
 305   if (fromlog != EOL)
 306     {
 307       sync_error (fp, "Sync error during read of gdb packet", fromlog,
 308                   fromgdb);
 309     }
 310 }
 311
 312 /* Play data back to gdb from fp (after skipping leading blank) up until a
 313    \n is read from fp (which is discarded and not sent to gdb). */
 314
 315 static void
 316 play (FILE *fp)
 317 {
 318   int fromlog;
 319   char ch;
 320
 321   if ((fromlog = logchar (fp)) != ' ')
 322     {
 323       sync_error (fp, "Sync error skipping blank during write to gdb", ' ',
 324                   fromlog);
 325     }
 326   while ((fromlog = logchar (fp)) != EOL)
 327     {
 328       ch = fromlog;
 329       write (remote_desc, &ch, 1);
 330     }
 331 }
 332
 333 int
 334 main (int argc, char *argv[])
 335 {
 336   FILE *fp;
 337   int ch;
 338
 339   if (argc < 3)
 340     {
 341       fprintf (stderr, "Usage: gdbreplay <logfile> <host:port>\n");
 342       fflush (stderr);
 343       exit (1);
 344     }
 345   fp = fopen (argv[1], "r");
 346   if (fp == NULL)
 347     {
 348       perror_with_name (argv[1]);
 349     }
 350   remote_open (argv[2]);
 351   while ((ch = logchar (fp)) != EOF)
 352     {
 353       switch (ch)
 354         {
 355         case 'w':
 356           /* data sent from gdb to gdbreplay, accept and match it */
 357           expect (fp);
 358           break;
 359         case 'r':
 360           /* data sent from gdbreplay to gdb, play it */
 361           play (fp);
 362           break;
 363         case 'c':
 364           /* Command executed by gdb */
 365           while ((ch = logchar (fp)) != EOL);
 366           break;
 367         }
 368     }
 369   remote_close ();
 370   exit (0);
 371 }