gdb/gdbserver/gdbreplay.c

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