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