mirror of https://github.com/n-hys/bash.git
385 lines
9.7 KiB
C
385 lines
9.7 KiB
C
/* evalfile.c - read and evaluate commands from a file or file descriptor */
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/* Copyright (C) 1996-2017 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#include "../bashtypes.h"
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#include "posixstat.h"
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#include "filecntl.h"
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#include <stdio.h>
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#include <signal.h>
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#include <errno.h>
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#include "../bashansi.h"
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#include "../bashintl.h"
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#include "../shell.h"
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#include "../parser.h"
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#include "../jobs.h"
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#include "../builtins.h"
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#include "../flags.h"
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#include "../input.h"
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#include "../execute_cmd.h"
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#include "../trap.h"
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#include <y.tab.h>
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#if defined (HISTORY)
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# include "../bashhist.h"
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#endif
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#include <typemax.h>
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#include "common.h"
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#if !defined (errno)
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extern int errno;
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#endif
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/* Flags for _evalfile() */
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#define FEVAL_ENOENTOK 0x001
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#define FEVAL_BUILTIN 0x002
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#define FEVAL_UNWINDPROT 0x004
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#define FEVAL_NONINT 0x008
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#define FEVAL_LONGJMP 0x010
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#define FEVAL_HISTORY 0x020
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#define FEVAL_CHECKBINARY 0x040
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#define FEVAL_REGFILE 0x080
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#define FEVAL_NOPUSHARGS 0x100
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/* How many `levels' of sourced files we have. */
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int sourcelevel = 0;
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static int
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_evalfile (filename, flags)
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const char *filename;
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int flags;
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{
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volatile int old_interactive;
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procenv_t old_return_catch;
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int return_val, fd, result, pflags, i, nnull;
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ssize_t nr; /* return value from read(2) */
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char *string;
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struct stat finfo;
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size_t file_size;
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sh_vmsg_func_t *errfunc;
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#if defined (ARRAY_VARS)
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SHELL_VAR *funcname_v, *bash_source_v, *bash_lineno_v;
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ARRAY *funcname_a, *bash_source_a, *bash_lineno_a;
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struct func_array_state *fa;
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# if defined (DEBUGGER)
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SHELL_VAR *bash_argv_v, *bash_argc_v;
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ARRAY *bash_argv_a, *bash_argc_a;
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# endif
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char *t, tt[2];
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#endif
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USE_VAR(pflags);
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#if defined (ARRAY_VARS)
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GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a);
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GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a);
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GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a);
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# if defined (DEBUGGER)
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GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a);
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GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a);
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# endif
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#endif
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fd = open (filename, O_RDONLY);
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if (fd < 0 || (fstat (fd, &finfo) == -1))
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{
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i = errno;
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if (fd >= 0)
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close (fd);
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errno = i;
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file_error_and_exit:
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if (((flags & FEVAL_ENOENTOK) == 0) || errno != ENOENT)
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file_error (filename);
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if (flags & FEVAL_LONGJMP)
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{
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last_command_exit_value = EXECUTION_FAILURE;
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jump_to_top_level (EXITPROG);
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}
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return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE
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: ((errno == ENOENT && (flags & FEVAL_ENOENTOK) != 0) ? 0 : -1));
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}
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errfunc = ((flags & FEVAL_BUILTIN) ? builtin_error : internal_error);
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if (S_ISDIR (finfo.st_mode))
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{
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(*errfunc) (_("%s: is a directory"), filename);
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close (fd);
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return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
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}
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else if ((flags & FEVAL_REGFILE) && S_ISREG (finfo.st_mode) == 0)
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{
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(*errfunc) (_("%s: not a regular file"), filename);
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close (fd);
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return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
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}
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file_size = (size_t)finfo.st_size;
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/* Check for overflow with large files. */
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if (file_size != finfo.st_size || file_size + 1 < file_size)
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{
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(*errfunc) (_("%s: file is too large"), filename);
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close (fd);
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return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
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}
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if (S_ISREG (finfo.st_mode) && file_size <= SSIZE_MAX)
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{
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string = (char *)xmalloc (1 + file_size);
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nr = read (fd, string, file_size);
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if (nr >= 0)
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string[nr] = '\0';
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}
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else
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nr = zmapfd (fd, &string, 0);
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return_val = errno;
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close (fd);
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errno = return_val;
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if (nr < 0) /* XXX was != file_size, not < 0 */
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{
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free (string);
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goto file_error_and_exit;
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}
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if (nr == 0)
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{
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free (string);
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return ((flags & FEVAL_BUILTIN) ? EXECUTION_SUCCESS : 1);
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}
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if ((flags & FEVAL_CHECKBINARY) &&
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check_binary_file (string, (nr > 80) ? 80 : nr))
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{
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free (string);
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(*errfunc) (_("%s: cannot execute binary file"), filename);
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return ((flags & FEVAL_BUILTIN) ? EX_BINARY_FILE : -1);
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}
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i = strlen (string);
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if (i < nr)
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{
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for (nnull = i = 0; i < nr; i++)
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if (string[i] == '\0')
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{
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memmove (string+i, string+i+1, nr - i);
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nr--;
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/* Even if the `check binary' flag is not set, we want to avoid
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sourcing files with more than 256 null characters -- that
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probably indicates a binary file. */
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if ((flags & FEVAL_BUILTIN) && ++nnull > 256)
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{
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free (string);
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(*errfunc) (_("%s: cannot execute binary file"), filename);
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return ((flags & FEVAL_BUILTIN) ? EX_BINARY_FILE : -1);
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}
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}
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}
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if (flags & FEVAL_UNWINDPROT)
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{
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begin_unwind_frame ("_evalfile");
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unwind_protect_int (return_catch_flag);
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unwind_protect_jmp_buf (return_catch);
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if (flags & FEVAL_NONINT)
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unwind_protect_int (interactive);
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unwind_protect_int (sourcelevel);
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}
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else
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{
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COPY_PROCENV (return_catch, old_return_catch);
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if (flags & FEVAL_NONINT)
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old_interactive = interactive;
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}
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if (flags & FEVAL_NONINT)
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interactive = 0;
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return_catch_flag++;
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sourcelevel++;
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#if defined (ARRAY_VARS)
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array_push (bash_source_a, (char *)filename);
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t = itos (executing_line_number ());
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array_push (bash_lineno_a, t);
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free (t);
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array_push (funcname_a, "source"); /* not exactly right */
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fa = (struct func_array_state *)xmalloc (sizeof (struct func_array_state));
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fa->source_a = bash_source_a;
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fa->source_v = bash_source_v;
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fa->lineno_a = bash_lineno_a;
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fa->lineno_v = bash_lineno_v;
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fa->funcname_a = funcname_a;
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fa->funcname_v = funcname_v;
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if (flags & FEVAL_UNWINDPROT)
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add_unwind_protect (restore_funcarray_state, fa);
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# if defined (DEBUGGER)
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/* Have to figure out a better way to do this when `source' is supplied
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arguments */
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if ((flags & FEVAL_NOPUSHARGS) == 0)
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{
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if (shell_compatibility_level <= 44)
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init_bash_argv ();
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array_push (bash_argv_a, (char *)filename); /* XXX - unconditionally? */
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tt[0] = '1'; tt[1] = '\0';
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array_push (bash_argc_a, tt);
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if (flags & FEVAL_UNWINDPROT)
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add_unwind_protect (pop_args, 0);
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}
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# endif
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#endif
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/* set the flags to be passed to parse_and_execute */
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pflags = SEVAL_RESETLINE;
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pflags |= (flags & FEVAL_HISTORY) ? 0 : SEVAL_NOHIST;
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if (flags & FEVAL_BUILTIN)
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result = EXECUTION_SUCCESS;
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return_val = setjmp_nosigs (return_catch);
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/* If `return' was seen outside of a function, but in the script, then
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force parse_and_execute () to clean up. */
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if (return_val)
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{
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parse_and_execute_cleanup (-1);
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result = return_catch_value;
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}
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else
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result = parse_and_execute (string, filename, pflags);
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if (flags & FEVAL_UNWINDPROT)
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run_unwind_frame ("_evalfile");
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else
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{
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if (flags & FEVAL_NONINT)
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interactive = old_interactive;
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#if defined (ARRAY_VARS)
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restore_funcarray_state (fa);
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# if defined (DEBUGGER)
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if ((flags & FEVAL_NOPUSHARGS) == 0)
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{
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/* Don't need to call pop_args here until we do something better
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when source is passed arguments (see above). */
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array_pop (bash_argc_a);
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array_pop (bash_argv_a);
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}
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# endif
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#endif
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return_catch_flag--;
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sourcelevel--;
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COPY_PROCENV (old_return_catch, return_catch);
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}
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/* If we end up with EOF after sourcing a file, which can happen when the file
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doesn't end with a newline, pretend that it did. */
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if (current_token == yacc_EOF)
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push_token ('\n'); /* XXX */
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return ((flags & FEVAL_BUILTIN) ? result : 1);
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}
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int
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maybe_execute_file (fname, force_noninteractive)
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const char *fname;
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int force_noninteractive;
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{
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char *filename;
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int result, flags;
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filename = bash_tilde_expand (fname, 0);
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flags = FEVAL_ENOENTOK;
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if (force_noninteractive)
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flags |= FEVAL_NONINT;
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result = _evalfile (filename, flags);
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free (filename);
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return result;
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}
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int
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force_execute_file (fname, force_noninteractive)
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const char *fname;
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int force_noninteractive;
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{
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char *filename;
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int result, flags;
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filename = bash_tilde_expand (fname, 0);
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flags = 0;
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if (force_noninteractive)
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flags |= FEVAL_NONINT;
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result = _evalfile (filename, flags);
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free (filename);
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return result;
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}
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#if defined (HISTORY)
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int
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fc_execute_file (filename)
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const char *filename;
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{
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int flags;
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/* We want these commands to show up in the history list if
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remember_on_history is set. We use FEVAL_BUILTIN to return
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the result of parse_and_execute. */
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flags = FEVAL_ENOENTOK|FEVAL_HISTORY|FEVAL_REGFILE|FEVAL_BUILTIN;
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return (_evalfile (filename, flags));
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}
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#endif /* HISTORY */
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int
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source_file (filename, sflags)
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const char *filename;
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int sflags;
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{
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int flags, rval;
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flags = FEVAL_BUILTIN|FEVAL_UNWINDPROT|FEVAL_NONINT;
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if (sflags)
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flags |= FEVAL_NOPUSHARGS;
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/* POSIX shells exit if non-interactive and file error. */
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if (posixly_correct && interactive_shell == 0 && executing_command_builtin == 0)
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flags |= FEVAL_LONGJMP;
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rval = _evalfile (filename, flags);
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run_return_trap ();
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return rval;
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}
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