gdb/gdbserver/gdbreplay.c

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