summaryrefslogtreecommitdiffstats
path: root/builtins/evalfile.c
blob: 32a7c8d68f60e127644b1393a0095f2740537a12 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
/* evalfile.c - read and evaluate commands from a file or file descriptor */

/* Copyright (C) 1996-2017 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Bash is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Bash.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <config.h>

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif

#include "../bashtypes.h"
#include "posixstat.h"
#include "filecntl.h"

#include <stdio.h>
#include <signal.h>
#include <errno.h>

#include "../bashansi.h"
#include "../bashintl.h"

#include "../shell.h"
#include "../parser.h"
#include "../jobs.h"
#include "../builtins.h"
#include "../flags.h"
#include "../input.h"
#include "../execute_cmd.h"
#include "../trap.h"

#include <y.tab.h>

#if defined (HISTORY)
#  include "../bashhist.h"
#endif

#include <typemax.h>

#include "common.h"

#if !defined (errno)
extern int errno;
#endif

/* Flags for _evalfile() */
#define FEVAL_ENOENTOK		0x001
#define FEVAL_BUILTIN		0x002
#define FEVAL_UNWINDPROT	0x004
#define FEVAL_NONINT		0x008
#define FEVAL_LONGJMP		0x010
#define FEVAL_HISTORY		0x020
#define FEVAL_CHECKBINARY	0x040
#define FEVAL_REGFILE		0x080
#define FEVAL_NOPUSHARGS	0x100

/* How many `levels' of sourced files we have. */
int sourcelevel = 0;

static int
_evalfile (filename, flags)
     const char *filename;
     int flags;
{
  volatile int old_interactive;
  procenv_t old_return_catch;
  int return_val, fd, result, pflags, i, nnull;
  ssize_t nr;			/* return value from read(2) */
  char *string;
  struct stat finfo;
  size_t file_size;
  sh_vmsg_func_t *errfunc;
#if defined (ARRAY_VARS)
  SHELL_VAR *funcname_v, *bash_source_v, *bash_lineno_v;
  ARRAY *funcname_a, *bash_source_a, *bash_lineno_a;
  struct func_array_state *fa;
#  if defined (DEBUGGER)
  SHELL_VAR *bash_argv_v, *bash_argc_v;
  ARRAY *bash_argv_a, *bash_argc_a;
#  endif
  char *t, tt[2];
#endif

  USE_VAR(pflags);

#if defined (ARRAY_VARS)
  GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a);
  GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a);
  GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a);
#  if defined (DEBUGGER)
  GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a);
  GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a);
#  endif
#endif

  fd = open (filename, O_RDONLY);

  if (fd < 0 || (fstat (fd, &finfo) == -1))
    {
      i = errno;
      if (fd >= 0)
	close (fd);
      errno = i;

file_error_and_exit:
      if (((flags & FEVAL_ENOENTOK) == 0) || errno != ENOENT)
	file_error (filename);

      if (flags & FEVAL_LONGJMP)
	{
	  last_command_exit_value = 1;
	  jump_to_top_level (EXITPROG);
	}

      return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE
      				      : ((errno == ENOENT && (flags & FEVAL_ENOENTOK) != 0) ? 0 : -1));
    }

  errfunc = ((flags & FEVAL_BUILTIN) ? builtin_error : internal_error);

  if (S_ISDIR (finfo.st_mode))
    {
      (*errfunc) (_("%s: is a directory"), filename);
      close (fd);
      return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
    }
  else if ((flags & FEVAL_REGFILE) && S_ISREG (finfo.st_mode) == 0)
    {
      (*errfunc) (_("%s: not a regular file"), filename);
      close (fd);
      return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
    }

  file_size = (size_t)finfo.st_size;
  /* Check for overflow with large files. */
  if (file_size != finfo.st_size || file_size + 1 < file_size)
    {
      (*errfunc) (_("%s: file is too large"), filename);
      close (fd);
      return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
    }      

  if (S_ISREG (finfo.st_mode) && file_size <= SSIZE_MAX)
    {
      string = (char *)xmalloc (1 + file_size);
      nr = read (fd, string, file_size);
      if (nr >= 0)
	string[nr] = '\0';
    }
  else
    nr = zmapfd (fd, &string, 0);

  return_val = errno;
  close (fd);
  errno = return_val;

  if (nr < 0)		/* XXX was != file_size, not < 0 */
    {
      free (string);
      goto file_error_and_exit;
    }

  if (nr == 0)
    {
      free (string);
      return ((flags & FEVAL_BUILTIN) ? EXECUTION_SUCCESS : 1);
    }
      
  if ((flags & FEVAL_CHECKBINARY) && 
      check_binary_file (string, (nr > 80) ? 80 : nr))
    {
      free (string);
      (*errfunc) (_("%s: cannot execute binary file"), filename);
      return ((flags & FEVAL_BUILTIN) ? EX_BINARY_FILE : -1);
    }

  i = strlen (string);
  if (i < nr)
    {
      for (nnull = i = 0; i < nr; i++)
	if (string[i] == '\0')
          {
	    memmove (string+i, string+i+1, nr - i);
	    nr--;
	    /* Even if the `check binary' flag is not set, we want to avoid
	       sourcing files with more than 256 null characters -- that
	       probably indicates a binary file. */
	    if ((flags & FEVAL_BUILTIN) && ++nnull > 256)
	      {
		free (string);
		(*errfunc) (_("%s: cannot execute binary file"), filename);
		return ((flags & FEVAL_BUILTIN) ? EX_BINARY_FILE : -1);
	      }
          }
    }

  if (flags & FEVAL_UNWINDPROT)
    {
      begin_unwind_frame ("_evalfile");

      unwind_protect_int (return_catch_flag);
      unwind_protect_jmp_buf (return_catch);
      if (flags & FEVAL_NONINT)
	unwind_protect_int (interactive);
      unwind_protect_int (sourcelevel);
    }
  else
    {
      COPY_PROCENV (return_catch, old_return_catch);
      if (flags & FEVAL_NONINT)
	old_interactive = interactive;
    }

  if (flags & FEVAL_NONINT)
    interactive = 0;

  return_catch_flag++;
  sourcelevel++;

#if defined (ARRAY_VARS)
  array_push (bash_source_a, (char *)filename);
  t = itos (executing_line_number ());
  array_push (bash_lineno_a, t);
  free (t);
  array_push (funcname_a, "source");	/* not exactly right */

  fa = (struct func_array_state *)xmalloc (sizeof (struct func_array_state));
  fa->source_a = bash_source_a;
  fa->source_v = bash_source_v;
  fa->lineno_a = bash_lineno_a;
  fa->lineno_v = bash_lineno_v;
  fa->funcname_a = funcname_a;
  fa->funcname_v = funcname_v;
  if (flags & FEVAL_UNWINDPROT)
    add_unwind_protect (restore_funcarray_state, fa);

#  if defined (DEBUGGER)
  /* Have to figure out a better way to do this when `source' is supplied
     arguments */
  if ((flags & FEVAL_NOPUSHARGS) == 0)
    {
      if (shell_compatibility_level <= 44)
	init_bash_argv ();
      array_push (bash_argv_a, (char *)filename);	/* XXX - unconditionally? */
      tt[0] = '1'; tt[1] = '\0';
      array_push (bash_argc_a, tt);
      if (flags & FEVAL_UNWINDPROT)
	add_unwind_protect (pop_args, 0);
    }
#  endif
#endif

  /* set the flags to be passed to parse_and_execute */
  pflags = SEVAL_RESETLINE;
  pflags |= (flags & FEVAL_HISTORY) ? 0 : SEVAL_NOHIST;

  if (flags & FEVAL_BUILTIN)
    result = EXECUTION_SUCCESS;

  return_val = setjmp_nosigs (return_catch);

  /* If `return' was seen outside of a function, but in the script, then
     force parse_and_execute () to clean up. */
  if (return_val)
    {
      parse_and_execute_cleanup (-1);
      result = return_catch_value;
    }
  else
    result = parse_and_execute (string, filename, pflags);

  if (flags & FEVAL_UNWINDPROT)
    run_unwind_frame ("_evalfile");
  else
    {
      if (flags & FEVAL_NONINT)
	interactive = old_interactive;
#if defined (ARRAY_VARS)
      restore_funcarray_state (fa);
#  if defined (DEBUGGER)
      if ((flags & FEVAL_NOPUSHARGS) == 0)
	{
	  /* Don't need to call pop_args here until we do something better
	     when source is passed arguments (see above). */
	  array_pop (bash_argc_a);
	  array_pop (bash_argv_a);
	}
#  endif
#endif
      return_catch_flag--;
      sourcelevel--;
      COPY_PROCENV (old_return_catch, return_catch);
    }

  /* If we end up with EOF after sourcing a file, which can happen when the file
     doesn't end with a newline, pretend that it did. */
  if (current_token == yacc_EOF)
    push_token ('\n');		/* XXX */

  return ((flags & FEVAL_BUILTIN) ? result : 1);
}

int
maybe_execute_file (fname, force_noninteractive)
     const char *fname;
     int force_noninteractive;
{
  char *filename;
  int result, flags;

  filename = bash_tilde_expand (fname, 0);
  flags = FEVAL_ENOENTOK;
  if (force_noninteractive)
    flags |= FEVAL_NONINT;
  result = _evalfile (filename, flags);
  free (filename);
  return result;
}

int
force_execute_file (fname, force_noninteractive)
     const char *fname;
     int force_noninteractive;
{
  char *filename;
  int result, flags;

  filename = bash_tilde_expand (fname, 0);
  flags = 0;
  if (force_noninteractive)
    flags |= FEVAL_NONINT;
  result = _evalfile (filename, flags);
  free (filename);
  return result;
}

#if defined (HISTORY)
int
fc_execute_file (filename)
     const char *filename;
{
  int flags;

  /* We want these commands to show up in the history list if
     remember_on_history is set.  We use FEVAL_BUILTIN to return
     the result of parse_and_execute. */
  flags = FEVAL_ENOENTOK|FEVAL_HISTORY|FEVAL_REGFILE|FEVAL_BUILTIN;
  return (_evalfile (filename, flags));
}
#endif /* HISTORY */

int
source_file (filename, sflags)
     const char *filename;
     int sflags;
{
  int flags, rval;

  flags = FEVAL_BUILTIN|FEVAL_UNWINDPROT|FEVAL_NONINT;
  if (sflags)
    flags |= FEVAL_NOPUSHARGS;
  /* POSIX shells exit if non-interactive and file error. */
  if (posixly_correct && interactive_shell == 0 && executing_command_builtin == 0)
    flags |= FEVAL_LONGJMP;
  rval = _evalfile (filename, flags);

  run_return_trap ();
  return rval;
}