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 (string)
  45      char *string;
  46 {
  47 #ifndef STDC_HEADERS
  48   extern int sys_nerr;
  49   extern char *sys_errlist[];
  50   extern int errno;
  51 #endif
  52   const char *err;
  53   char *combined;
  54
  55   err = (errno < sys_nerr) ? sys_errlist[errno] : "unknown error";
  56   combined = (char *) alloca (strlen (err) + strlen (string) + 3);
  57   strcpy (combined, string);
  58   strcat (combined, ": ");
  59   strcat (combined, err);
  60   fprintf (stderr, "\n%s.\n", combined);
  61   fflush (stderr);
  62   exit (1);
  63 }
  64
  65 static void
  66 sync_error (fp, desc, expect, got)
  67      FILE *fp;
  68      char *desc;
  69      int expect;
  70      int got;
  71 {
  72   fprintf (stderr, "\n%s\n", desc);
  73   fprintf (stderr, "At logfile offset %ld, expected '0x%x' got '0x%x'\n",
  74            ftell (fp), expect, got);
  75   fflush (stderr);
  76   exit (1);
  77 }
  78
  79 void
  80 remote_close ()
  81 {
  82   close (remote_desc);
  83 }
  84
  85 /* Open a connection to a remote debugger.
  86    NAME is the filename used for communication.  */
  87
  88 void
  89 remote_open (name)
  90      char *name;
  91 {
  92   extern char *strchr ();
  93
  94   if (!strchr (name, ':'))
  95     {
  96       fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);
  97       fflush (stderr);
  98       exit (1);
  99     }
 100   else
 101     {
 102       char *port_str;
 103       int port;
 104       struct sockaddr_in sockaddr;
 105       int tmp;
 106       struct protoent *protoent;
 107       int tmp_desc;
 108
 109       port_str = strchr (name, ':');
 110
 111       port = atoi (port_str + 1);
 112
 113       tmp_desc = socket (PF_INET, SOCK_STREAM, 0);
 114       if (tmp_desc < 0)
 115         perror_with_name ("Can't open socket");
 116
 117       /* Allow rapid reuse of this port. */
 118       tmp = 1;
 119       setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
 120                   sizeof (tmp));
 121
 122       sockaddr.sin_family = PF_INET;
 123       sockaddr.sin_port = htons (port);
 124       sockaddr.sin_addr.s_addr = INADDR_ANY;
 125
 126       if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr))
 127           || listen (tmp_desc, 1))
 128         perror_with_name ("Can't bind address");
 129
 130       tmp = sizeof (sockaddr);
 131       remote_desc = accept (tmp_desc, (struct sockaddr *) &sockaddr, &tmp);
 132       if (remote_desc == -1)
 133         perror_with_name ("Accept failed");
 134
 135       protoent = getprotobyname ("tcp");
 136       if (!protoent)
 137         perror_with_name ("getprotobyname");
 138
 139       /* Enable TCP keep alive process. */
 140       tmp = 1;
 141       setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp));
 142
 143       /* Tell TCP not to delay small packets.  This greatly speeds up
 144          interactive response. */
 145       tmp = 1;
 146       setsockopt (remote_desc, protoent->p_proto, TCP_NODELAY,
 147                   (char *) &tmp, sizeof (tmp));
 148
 149       close (tmp_desc);         /* No longer need this */
 150
 151       signal (SIGPIPE, SIG_IGN);        /* If we don't do this, then gdbreplay simply
 152                                            exits when the remote side dies.  */
 153     }
 154
 155   fcntl (remote_desc, F_SETFL, FASYNC);
 156
 157   fprintf (stderr, "Replay logfile using %s\n", name);
 158   fflush (stderr);
 159 }
 160
 161 static int
 162 tohex (ch)
 163      int ch;
 164 {
 165   if (ch >= '0' && ch <= '9')
 166     {
 167       return (ch - '0');
 168     }
 169   if (ch >= 'A' && ch <= 'F')
 170     {
 171       return (ch - 'A' + 10);
 172     }
 173   if (ch >= 'a' && ch <= 'f')
 174     {
 175       return (ch - 'a' + 10);
 176     }
 177   fprintf (stderr, "\nInvalid hex digit '%c'\n", ch);
 178   fflush (stderr);
 179   exit (1);
 180 }
 181
 182 static int
 183 logchar (fp)
 184      FILE *fp;
 185 {
 186   int ch;
 187   int ch2;
 188
 189   ch = fgetc (fp);
 190   fputc (ch, stdout);
 191   fflush (stdout);
 192   switch (ch)
 193     {
 194     case '\n':
 195       ch = EOL;
 196       break;
 197     case '\\':
 198       ch = fgetc (fp);
 199       fputc (ch, stdout);
 200       fflush (stdout);
 201       switch (ch)
 202         {
 203         case '\\':
 204           break;
 205         case 'b':
 206           ch = '\b';
 207           break;
 208         case 'f':
 209           ch = '\f';
 210           break;
 211         case 'n':
 212           ch = '\n';
 213           break;
 214         case 'r':
 215           ch = '\r';
 216           break;
 217         case 't':
 218           ch = '\t';
 219           break;
 220         case 'v':
 221           ch = '\v';
 222           break;
 223         case 'x':
 224           ch2 = fgetc (fp);
 225           fputc (ch2, stdout);
 226           fflush (stdout);
 227           ch = tohex (ch2) << 4;
 228           ch2 = fgetc (fp);
 229           fputc (ch2, stdout);
 230           fflush (stdout);
 231           ch |= tohex (ch2);
 232           break;
 233         default:
 234           /* Treat any other char as just itself */
 235           break;
 236         }
 237     default:
 238       break;
 239     }
 240   return (ch);
 241 }
 242
 243 /* Accept input from gdb and match with chars from fp (after skipping one
 244    blank) up until a \n is read from fp (which is not matched) */
 245
 246 void
 247 expect (fp)
 248      FILE *fp;
 249 {
 250   int fromlog;
 251   unsigned char fromgdb;
 252
 253   if ((fromlog = logchar (fp)) != ' ')
 254     {
 255       sync_error (fp, "Sync error during gdb read of leading blank", ' ',
 256                   fromlog);
 257     }
 258   do
 259     {
 260       fromlog = logchar (fp);
 261       if (fromlog == EOL)
 262         {
 263           break;
 264         }
 265       read (remote_desc, &fromgdb, 1);
 266     }
 267   while (fromlog == fromgdb);
 268   if (fromlog != EOL)
 269     {
 270       sync_error (fp, "Sync error during read of gdb packet", fromlog,
 271                   fromgdb);
 272     }
 273 }
 274
 275 /* Play data back to gdb from fp (after skipping leading blank) up until a
 276    \n is read from fp (which is discarded and not sent to gdb). */
 277
 278 void
 279 play (fp)
 280      FILE *fp;
 281 {
 282   int fromlog;
 283   char ch;
 284
 285   if ((fromlog = logchar (fp)) != ' ')
 286     {
 287       sync_error (fp, "Sync error skipping blank during write to gdb", ' ',
 288                   fromlog);
 289     }
 290   while ((fromlog = logchar (fp)) != EOL)
 291     {
 292       ch = fromlog;
 293       write (remote_desc, &ch, 1);
 294     }
 295 }
 296
 297 int
 298 main (argc, argv)
 299      int argc;
 300      char *argv[];
 301 {
 302   FILE *fp;
 303   int ch;
 304
 305   if (argc < 3)
 306     {
 307       fprintf (stderr, "Usage: gdbreplay <logfile> <host:port>\n");
 308       fflush (stderr);
 309       exit (1);
 310     }
 311   fp = fopen (argv[1], "r");
 312   if (fp == NULL)
 313     {
 314       perror_with_name (argv[1]);
 315     }
 316   remote_open (argv[2]);
 317   while ((ch = logchar (fp)) != EOF)
 318     {
 319       switch (ch)
 320         {
 321         case 'w':
 322           /* data sent from gdb to gdbreplay, accept and match it */
 323           expect (fp);
 324           break;
 325         case 'r':
 326           /* data sent from gdbreplay to gdb, play it */
 327           play (fp);
 328           break;
 329         case 'c':
 330           /* Command executed by gdb */
 331           while ((ch = logchar (fp)) != EOL);
 332           break;
 333         }
 334     }
 335   remote_close ();
 336   exit (0);
 337 }