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