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