gdb/gdbserver/gdbreplay.c

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