gdb/kod-cisco.c

   1 /* Kernel Object Display facility for Cisco
   2    Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   3
   4    Written by Tom Tromey <tromey@cygnus.com>.
   5
   6 This file is part of GDB.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21 Boston, MA 02110-1301, USA.  */
  22
  23 #include "defs.h"
  24 #include "gdb_string.h"
  25 #include "kod.h"
  26
  27 #ifdef HAVE_STDLIB_H
  28 #include <stdlib.h>
  29 #endif
  30
  31 /* Define this to turn off communication with target.  */
  32 /* #define FAKE_PACKET */
  33
  34 /* Size of buffer used for remote communication.  */
  35 #define PBUFSIZ 400
  36
  37 /* Pointers to gdb callbacks.  */
  38 static void (*gdb_kod_display) (char *);
  39 static void (*gdb_kod_query) (char *, char *, int *);
  40
  41 \f
  42
  43 /* Initialize and return library name and version.
  44    The gdb side of KOD, kod.c, passes us two functions: one for
  45    displaying output (presumably to the user) and the other for
  46    querying the target.  */
  47 char *
  48 cisco_kod_open (kod_display_callback_ftype *display_func,
  49                 kod_query_callback_ftype *query_func)
  50 {
  51   char buffer[PBUFSIZ];
  52   int bufsiz = PBUFSIZ;
  53   int i, count;
  54
  55   gdb_kod_display = display_func;
  56   gdb_kod_query = query_func;
  57
  58   /* Get the OS info, and check the version field.  This is the stub
  59      version, which we use to see whether we will understand what
  60      comes back.  This is lame, but the `qKoL' request doesn't
  61      actually provide enough configurability.
  62
  63      Right now the only defined version number is `0.0.0'.
  64      This stub supports qKoI and the `a' (any) object requests qKaL
  65      and qKaI.  Each `a' object is returned as a 4-byte integer ID.
  66      An info request on an object returns a pair of 4-byte integers;
  67      the first is the object pointer and the second is the thread ID.  */
  68
  69 #ifndef FAKE_PACKET
  70   (*gdb_kod_query) ("oI;", buffer, &bufsiz);
  71 #else
  72   strcpy (buffer, "Cisco IOS/Classic/13.4 0.0.0");
  73 #endif
  74
  75   count = 2;
  76   for (i = 0; count && buffer[i] != '\0'; ++i)
  77     {
  78       if (buffer[i] == ' ')
  79         --count;
  80     }
  81
  82   if (buffer[i] == '\0')
  83     error (_("Remote returned malformed packet."));
  84   if (strcmp (&buffer[i], "0.0.0"))
  85     error (_("Remote returned unknown stub version: %s."), &buffer[i]);
  86
  87   /* Return name, version, and description.  I hope we have enough
  88      space.  */
  89   return (xstrdup ("gdbkodcisco v0.0.0 - Cisco Kernel Object Display"));
  90 }
  91
  92 /* Close the connection.  */
  93 void
  94 cisco_kod_close (void)
  95 {
  96 }
  97
  98 /* Print a "bad packet" message.  */
  99 static void
 100 bad_packet (void)
 101 {
 102   (*gdb_kod_display) ("Remote target returned malformed packet.\n");
 103 }
 104
 105 /* Print information about currently known kernel objects.
 106    We currently ignore the argument.  There is only one mode of
 107    querying the Cisco kernel: we ask for a dump of everything, and
 108    it returns it.  */
 109 void
 110 cisco_kod_request (char *arg, int from_tty)
 111 {
 112   char buffer[PBUFSIZ], command[PBUFSIZ];
 113   int done = 0, i;
 114   int fail = 0;
 115
 116   char **sync_ids = NULL;
 117   int sync_len = 0;
 118   int sync_next = 0;
 119   char *prev_id = NULL;
 120
 121   if (! arg || strcmp (arg, "any"))
 122     {
 123       /* "Top-level" command.  This is really silly, but it also seems
 124          to be how KOD is defined.  */
 125       /* Even sillier is the fact that this first line must start
 126          with the word "List".  See kod.tcl.  */
 127       (*gdb_kod_display) ("List of Cisco Kernel Objects\n");
 128       (*gdb_kod_display) ("Object\tDescription\n");
 129       (*gdb_kod_display) ("any\tAny and all objects\n");
 130       return;
 131     }
 132
 133   while (! done)
 134     {
 135       int off = 0;              /* Where we are in the string.  */
 136       long count;               /* Number of objects in this packet.  */
 137       int bufsiz = PBUFSIZ;
 138       char *s_end;
 139
 140       strcpy (command, "aL");
 141       if (prev_id)
 142         {
 143           strcat (command, ",");
 144           strcat (command, prev_id);
 145         }
 146       strcat (command, ";");
 147
 148 #ifndef FAKE_PACKET
 149       /* We talk to the target by calling through the query function
 150          passed to us when we were initialized.  */
 151       (*gdb_kod_query) (command, buffer, &bufsiz);
 152 #else
 153       /* Fake up a multi-part packet.  */
 154       if (! strncmp (&command[3], "a500005a", 8))
 155         strcpy (buffer, "KAL,01,1,f500005f;f500005f;");
 156       else
 157         strcpy (buffer, "KAL,02,0,a500005a;a500005a;de02869f;");
 158 #endif
 159
 160       /* Empty response is an error.  */
 161       if (strlen (buffer) == 0)
 162         {
 163           (*gdb_kod_display) ("Remote target did not recognize kernel object query command.\n");
 164           fail = 1;
 165           break;
 166         }
 167
 168       /* If we don't get a `K' response then the buffer holds the
 169          target's error message.  */
 170       if (buffer[0] != 'K')
 171         {
 172           (*gdb_kod_display) (buffer);
 173           fail = 1;
 174           break;
 175         }
 176
 177       /* Make sure we get the response we expect.  */
 178       if (strncmp (buffer, "KAL,", 4))
 179         {
 180           bad_packet ();
 181           fail = 1;
 182           break;
 183         }
 184       off += 4;
 185
 186       /* Parse out the count.  We expect to convert exactly two
 187          characters followed by a comma.  */
 188       count = strtol (&buffer[off], &s_end, 16);
 189       if (s_end - &buffer[off] != 2 || buffer[off + 2] != ',')
 190         {
 191           bad_packet ();
 192           fail = 1;
 193           break;
 194         }
 195       off += 3;
 196
 197       /* Parse out the `done' flag.  */
 198       if ((buffer[off] != '0' && buffer[off] != '1')
 199           || buffer[off + 1] != ',')
 200         {
 201           bad_packet ();
 202           fail = 1;
 203           break;
 204         }
 205       done = buffer[off] == '1';
 206       off += 2;
 207
 208       /* Id of the last item; we might this to construct the next
 209          request.  */
 210       prev_id = &buffer[off];
 211       if (strlen (prev_id) < 8 || buffer[off + 8] != ';')
 212         {
 213           bad_packet ();
 214           fail = 1;
 215           break;
 216         }
 217       buffer[off + 8] = '\0';
 218       off += 9;
 219
 220       sync_len += count;
 221       sync_ids = (char **) xrealloc (sync_ids, sync_len * sizeof (char *));
 222
 223       for (i = 0; i < count; ++i)
 224         {
 225           if (strlen (&buffer[off]) < 8 || buffer[off + 8] != ';')
 226             {
 227               bad_packet ();
 228               fail = 1;
 229               break;
 230             }
 231           buffer[off + 8] = '\0';
 232           sync_ids[sync_next++] = xstrdup (&buffer[off]);
 233           off += 9;
 234         }
 235
 236       if (buffer[off] != '\0')
 237         {
 238           bad_packet ();
 239           fail = 1;
 240           break;
 241         }
 242     }
 243
 244   /* We've collected all the sync object IDs.  Now query to get the
 245      specific information, and arrange to print this info.  */
 246   if (! fail)
 247     {
 248       (*gdb_kod_display) ("Object ID\tObject Pointer\tThread ID\n");
 249
 250       for (i = 0; i < sync_next; ++i)
 251         {
 252           int off = 0;
 253           int bufsiz = PBUFSIZ;
 254
 255           /* For now assume a query can be accomplished in a single
 256              transaction.  This is implied in the protocol document.
 257              See comments above, and the KOD protocol document, to
 258              understand the parsing of the return value.  */
 259           strcpy (command, "aI,");
 260           strcat (command, sync_ids[i]);
 261           strcat (command, ";");
 262
 263 #ifndef FAKE_PACKET
 264           (*gdb_kod_query) (command, buffer, &bufsiz);
 265 #else
 266           strcpy (buffer, "KAI,");
 267           strcat (buffer, sync_ids[i]);
 268           strcat (buffer, ",ffef00a0,cd00123d;");
 269 #endif
 270
 271           if (strlen (buffer) == 0)
 272             {
 273               (*gdb_kod_display) ("Remote target did not recognize KOD command.\n");
 274               break;
 275             }
 276
 277           if (strncmp (buffer, "KAI,", 4))
 278             {
 279               bad_packet ();
 280               break;
 281             }
 282           off += 4;
 283
 284           if (strncmp (&buffer[off], sync_ids[i], 8)
 285               || buffer[off + 8] != ',')
 286             {
 287               bad_packet ();
 288               break;
 289             }
 290           off += 9;
 291
 292           /* Extract thread id and sync object pointer.  */
 293           if (strlen (&buffer[off]) != 2 * 8 + 2
 294               || buffer[off + 8] != ','
 295               || buffer[off + 17] != ';')
 296             {
 297               bad_packet ();
 298               break;
 299             }
 300
 301           buffer[off + 8] = '\0';
 302           buffer[off + 17] = '\0';
 303
 304           /* Display the result.  */
 305           (*gdb_kod_display) (sync_ids[i]);
 306           (*gdb_kod_display) ("\t");
 307           (*gdb_kod_display) (&buffer[off]);
 308           (*gdb_kod_display) ("\t");
 309           (*gdb_kod_display) (&buffer[off + 9]);
 310           (*gdb_kod_display) ("\n");
 311         }
 312     }
 313
 314   /* Free memory.  */
 315   for (i = 0; i < sync_next; ++i)
 316     xfree (sync_ids[i]);
 317   xfree (sync_ids);
 318 }