gdb/gdbserver/gdbreplay.c

   1 /* Replay a remote debug session logfile for GDB.
   2    Copyright 1996, 1998, 1999, 2000, 2002, 2003, 2005
   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., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include "config.h"
  24 #include <stdio.h>
  25 #include <sys/file.h>
  26 #include <netinet/in.h>
  27 #include <sys/socket.h>
  28 #include <netdb.h>
  29 #include <netinet/tcp.h>
  30 #include <signal.h>
  31 #include <ctype.h>
  32 #include <fcntl.h>
  33 #include <errno.h>
  34
  35 #ifdef HAVE_STDLIB_H
  36 #include <stdlib.h>
  37 #endif
  38 #ifdef HAVE_STRING_H
  39 #include <string.h>
  40 #endif
  41 #ifdef HAVE_UNISTD_H
  42 #include <unistd.h>
  43 #endif
  44
  45 #ifndef HAVE_SOCKLEN_T
  46 typedef int socklen_t;
  47 #endif
  48
  49 /* Sort of a hack... */
  50 #define EOL (EOF - 1)
  51
  52 static int remote_desc;
  53
  54 /* Print the system error message for errno, and also mention STRING
  55    as the file name for which the error was encountered.
  56    Then return to command level.  */
  57
  58 static void
  59 perror_with_name (char *string)
  60 {
  61 #ifndef STDC_HEADERS
  62   extern int errno;
  63 #endif
  64   const char *err;
  65   char *combined;
  66
  67   err = strerror (errno);
  68   if (err == NULL)
  69     err = "unknown error";
  70
  71   combined = (char *) alloca (strlen (err) + strlen (string) + 3);
  72   strcpy (combined, string);
  73   strcat (combined, ": ");
  74   strcat (combined, err);
  75   fprintf (stderr, "\n%s.\n", combined);
  76   fflush (stderr);
  77   exit (1);
  78 }
  79
  80 static void
  81 sync_error (FILE *fp, char *desc, int expect, int got)
  82 {
  83   fprintf (stderr, "\n%s\n", desc);
  84   fprintf (stderr, "At logfile offset %ld, expected '0x%x' got '0x%x'\n",
  85            ftell (fp), expect, got);
  86   fflush (stderr);
  87   exit (1);
  88 }
  89
  90 static void
  91 remote_close (void)
  92 {
  93   close (remote_desc);
  94 }
  95
  96 /* Open a connection to a remote debugger.
  97    NAME is the filename used for communication.  */
  98
  99 static void
 100 remote_open (char *name)
 101 {
 102   if (!strchr (name, ':'))
 103     {
 104       fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);
 105       fflush (stderr);
 106       exit (1);
 107     }
 108   else
 109     {
 110       char *port_str;
 111       int port;
 112       struct sockaddr_in sockaddr;
 113       socklen_t tmp;
 114       int tmp_desc;
 115
 116       port_str = strchr (name, ':');
 117
 118       port = atoi (port_str + 1);
 119
 120       tmp_desc = socket (PF_INET, SOCK_STREAM, 0);
 121       if (tmp_desc < 0)
 122         perror_with_name ("Can't open socket");
 123
 124       /* Allow rapid reuse of this port. */
 125       tmp = 1;
 126       setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
 127                   sizeof (tmp));
 128
 129       sockaddr.sin_family = PF_INET;
 130       sockaddr.sin_port = htons (port);
 131       sockaddr.sin_addr.s_addr = INADDR_ANY;
 132
 133       if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr))
 134           || listen (tmp_desc, 1))
 135         perror_with_name ("Can't bind address");
 136
 137       tmp = sizeof (sockaddr);
 138       remote_desc = accept (tmp_desc, (struct sockaddr *) &sockaddr, &tmp);
 139       if (remote_desc == -1)
 140         perror_with_name ("Accept failed");
 141
 142       /* Enable TCP keep alive process. */
 143       tmp = 1;
 144       setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp));
 145
 146       /* Tell TCP not to delay small packets.  This greatly speeds up
 147          interactive response. */
 148       tmp = 1;
 149       setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
 150                   (char *) &tmp, sizeof (tmp));
 151
 152       close (tmp_desc);         /* No longer need this */
 153
 154       signal (SIGPIPE, SIG_IGN);        /* If we don't do this, then gdbreplay simply
 155                                            exits when the remote side dies.  */
 156     }
 157
 158   fcntl (remote_desc, F_SETFL, FASYNC);
 159
 160   fprintf (stderr, "Replay logfile using %s\n", name);
 161   fflush (stderr);
 162 }
 163
 164 static int
 165 tohex (int ch)
 166 {
 167   if (ch >= '0' && ch <= '9')
 168     {
 169       return (ch - '0');
 170     }
 171   if (ch >= 'A' && ch <= 'F')
 172     {
 173       return (ch - 'A' + 10);
 174     }
 175   if (ch >= 'a' && ch <= 'f')
 176     {
 177       return (ch - 'a' + 10);
 178     }
 179   fprintf (stderr, "\nInvalid hex digit '%c'\n", ch);
 180   fflush (stderr);
 181   exit (1);
 182 }
 183
 184 static int
 185 logchar (FILE *fp)
 186 {
 187   int ch;
 188   int ch2;
 189
 190   ch = fgetc (fp);
 191   fputc (ch, stdout);
 192   fflush (stdout);
 193   switch (ch)
 194     {
 195     case '\n':
 196       ch = EOL;
 197       break;
 198     case '\\':
 199       ch = fgetc (fp);
 200       fputc (ch, stdout);
 201       fflush (stdout);
 202       switch (ch)
 203         {
 204         case '\\':
 205           break;
 206         case 'b':
 207           ch = '\b';
 208           break;
 209         case 'f':
 210           ch = '\f';
 211           break;
 212         case 'n':
 213           ch = '\n';
 214           break;
 215         case 'r':
 216           ch = '\r';
 217           break;
 218         case 't':
 219           ch = '\t';
 220           break;
 221         case 'v':
 222           ch = '\v';
 223           break;
 224         case 'x':
 225           ch2 = fgetc (fp);
 226           fputc (ch2, stdout);
 227           fflush (stdout);
 228           ch = tohex (ch2) << 4;
 229           ch2 = fgetc (fp);
 230           fputc (ch2, stdout);
 231           fflush (stdout);
 232           ch |= tohex (ch2);
 233           break;
 234         default:
 235           /* Treat any other char as just itself */
 236           break;
 237         }
 238     default:
 239       break;
 240     }
 241   return (ch);
 242 }
 243
 244 /* Accept input from gdb and match with chars from fp (after skipping one
 245    blank) up until a \n is read from fp (which is not matched) */
 246
 247 static void
 248 expect (FILE *fp)
 249 {
 250   int fromlog;
 251   unsigned char fromgdb;
 252
 253   if ((fromlog = logchar (fp)) != ' ')
 254     {
 255       sync_error (fp, "Sync error during gdb read of leading blank", ' ',
 256                   fromlog);
 257     }
 258   do
 259     {
 260       fromlog = logchar (fp);
 261       if (fromlog == EOL)
 262         {
 263           break;
 264         }
 265       read (remote_desc, &fromgdb, 1);
 266     }
 267   while (fromlog == fromgdb);
 268   if (fromlog != EOL)
 269     {
 270       sync_error (fp, "Sync error during read of gdb packet", fromlog,
 271                   fromgdb);
 272     }
 273 }
 274
 275 /* Play data back to gdb from fp (after skipping leading blank) up until a
 276    \n is read from fp (which is discarded and not sent to gdb). */
 277
 278 static void
 279 play (FILE *fp)
 280 {
 281   int fromlog;
 282   char ch;
 283
 284   if ((fromlog = logchar (fp)) != ' ')
 285     {
 286       sync_error (fp, "Sync error skipping blank during write to gdb", ' ',
 287                   fromlog);
 288     }
 289   while ((fromlog = logchar (fp)) != EOL)
 290     {
 291       ch = fromlog;
 292       write (remote_desc, &ch, 1);
 293     }
 294 }
 295
 296 int
 297 main (int argc, char *argv[])
 298 {
 299   FILE *fp;
 300   int ch;
 301
 302   if (argc < 3)
 303     {
 304       fprintf (stderr, "Usage: gdbreplay <logfile> <host:port>\n");
 305       fflush (stderr);
 306       exit (1);
 307     }
 308   fp = fopen (argv[1], "r");
 309   if (fp == NULL)
 310     {
 311       perror_with_name (argv[1]);
 312     }
 313   remote_open (argv[2]);
 314   while ((ch = logchar (fp)) != EOF)
 315     {
 316       switch (ch)
 317         {
 318         case 'w':
 319           /* data sent from gdb to gdbreplay, accept and match it */
 320           expect (fp);
 321           break;
 322         case 'r':
 323           /* data sent from gdbreplay to gdb, play it */
 324           play (fp);
 325           break;
 326         case 'c':
 327           /* Command executed by gdb */
 328           while ((ch = logchar (fp)) != EOL);
 329           break;
 330         }
 331     }
 332   remote_close ();
 333   exit (0);
 334 }