--- /dev/null
+/* bashhist.c -- bash interface to the GNU history library. */
+
+/* Copyright (C) 1993-2009 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 (HISTORY)
+
+#if defined (HAVE_UNISTD_H)
+# ifdef _MINIX
+# include <sys/types.h>
+# endif
+# include <unistd.h>
+#endif
+
+#include "bashtypes.h"
+#include <stdio.h>
+#include <errno.h>
+#include "bashansi.h"
+#include "posixstat.h"
+#include "filecntl.h"
+
+#include "bashintl.h"
+
+#if defined (SYSLOG_HISTORY)
+# include <syslog.h>
+#endif
+
+#include "shell.h"
+#include "flags.h"
+#include "input.h"
+#include "parser.h" /* for the struct dstack stuff. */
+#include "pathexp.h" /* for the struct ignorevar stuff */
+#include "bashhist.h" /* matching prototypes and declarations */
+#include "builtins/common.h"
+
+#include <readline/history.h>
+#include <glob/glob.h>
+#include <glob/strmatch.h>
+
+#if defined (READLINE)
+# include "bashline.h"
+extern int rl_done, rl_dispatching; /* should really include readline.h */
+#endif
+
+#if !defined (errno)
+extern int errno;
+#endif
+
+static int histignore_item_func __P((struct ign *));
+static int check_history_control __P((char *));
+static void hc_erasedups __P((char *));
+static void really_add_history __P((char *));
+
+static struct ignorevar histignore =
+{
+ "HISTIGNORE",
+ (struct ign *)0,
+ 0,
+ (char *)0,
+ (sh_iv_item_func_t *)histignore_item_func,
+};
+
+#define HIGN_EXPAND 0x01
+
+/* Declarations of bash history variables. */
+/* Non-zero means to remember lines typed to the shell on the history
+ list. This is different than the user-controlled behaviour; this
+ becomes zero when we read lines from a file, for example. */
+int remember_on_history = 1;
+int enable_history_list = 1; /* value for `set -o history' */
+
+/* The number of lines that Bash has added to this history session. The
+ difference between the number of the top element in the history list
+ (offset from history_base) and the number of lines in the history file.
+ Appending this session's history to the history file resets this to 0. */
+int history_lines_this_session;
+
+/* The number of lines that Bash has read from the history file. */
+int history_lines_in_file;
+
+#if defined (BANG_HISTORY)
+/* Non-zero means do no history expansion on this line, regardless
+ of what history_expansion says. */
+int history_expansion_inhibited;
+#endif
+
+/* With the old default, every line was saved in the history individually.
+ I.e., if the user enters:
+ bash$ for i in a b c
+ > do
+ > echo $i
+ > done
+ Each line will be individually saved in the history.
+ bash$ history
+ 10 for i in a b c
+ 11 do
+ 12 echo $i
+ 13 done
+ 14 history
+ If the variable command_oriented_history is set, multiple lines
+ which form one command will be saved as one history entry.
+ bash$ for i in a b c
+ > do
+ > echo $i
+ > done
+ bash$ history
+ 10 for i in a b c
+ do
+ echo $i
+ done
+ 11 history
+ The user can then recall the whole command all at once instead
+ of just being able to recall one line at a time.
+
+ This is now enabled by default.
+ */
+int command_oriented_history = 1;
+
+/* Set to 1 if the first line of a possibly-multi-line command was saved
+ in the history list. Managed by maybe_add_history(), but global so
+ the history-manipluating builtins can see it. */
+int current_command_first_line_saved = 0;
+
+/* Non-zero means to store newlines in the history list when using
+ command_oriented_history rather than trying to use semicolons. */
+int literal_history;
+
+/* Non-zero means to append the history to the history file at shell
+ exit, even if the history has been stifled. */
+int force_append_history;
+
+/* A nit for picking at history saving. Flags have the following values:
+
+ Value == 0 means save all lines parsed by the shell on the history.
+ Value & HC_IGNSPACE means save all lines that do not start with a space.
+ Value & HC_IGNDUPS means save all lines that do not match the last
+ line saved.
+ Value & HC_ERASEDUPS means to remove all other matching lines from the
+ history list before saving the latest line. */
+int history_control;
+
+/* Set to 1 if the last command was added to the history list successfully
+ as a separate history entry; set to 0 if the line was ignored or added
+ to a previous entry as part of command-oriented-history processing. */
+int hist_last_line_added;
+
+/* Set to 1 if builtins/history.def:push_history added the last history
+ entry. */
+int hist_last_line_pushed;
+
+#if defined (READLINE)
+/* If non-zero, and readline is being used, the user is offered the
+ chance to re-edit a failed history expansion. */
+int history_reediting;
+
+/* If non-zero, and readline is being used, don't directly execute a
+ line with history substitution. Reload it into the editing buffer
+ instead and let the user further edit and confirm with a newline. */
+int hist_verify;
+
+#endif /* READLINE */
+
+/* Non-zero means to not save function definitions in the history list. */
+int dont_save_function_defs;
+
+/* Variables declared in other files used here. */
+extern int current_command_line_count;
+
+extern struct dstack dstack;
+
+static int bash_history_inhibit_expansion __P((char *, int));
+#if defined (READLINE)
+static void re_edit __P((char *));
+#endif
+static int history_expansion_p __P((char *));
+static int shell_comment __P((char *));
+static int should_expand __P((char *));
+static HIST_ENTRY *last_history_entry __P((void));
+static char *expand_histignore_pattern __P((char *));
+static int history_should_ignore __P((char *));
+
+/* Is the history expansion starting at string[i] one that should not
+ be expanded? */
+static int
+bash_history_inhibit_expansion (string, i)
+ char *string;
+ int i;
+{
+ /* The shell uses ! as a pattern negation character in globbing [...]
+ expressions, so let those pass without expansion. */
+ if (i > 0 && (string[i - 1] == '[') && member (']', string + i + 1))
+ return (1);
+ /* The shell uses ! as the indirect expansion character, so let those
+ expansions pass as well. */
+ else if (i > 1 && string[i - 1] == '{' && string[i - 2] == '$' &&
+ member ('}', string + i + 1))
+ return (1);
+#if defined (EXTENDED_GLOB)
+ else if (extended_glob && i > 1 && string[i+1] == '(' && member (')', string + i + 2))
+ return (1);
+#endif
+ else
+ return (0);
+}
+
+void
+bash_initialize_history ()
+{
+ history_quotes_inhibit_expansion = 1;
+ history_search_delimiter_chars = ";&()|<>";
+ history_inhibit_expansion_function = bash_history_inhibit_expansion;
+#if defined (BANG_HISTORY)
+ sv_histchars ("histchars");
+#endif
+}
+
+void
+bash_history_reinit (interact)
+ int interact;
+{
+#if defined (BANG_HISTORY)
+ history_expansion = interact != 0;
+ history_expansion_inhibited = 1;
+#endif
+ remember_on_history = enable_history_list = interact != 0;
+ history_inhibit_expansion_function = bash_history_inhibit_expansion;
+}
+
+void
+bash_history_disable ()
+{
+ remember_on_history = 0;
+#if defined (BANG_HISTORY)
+ history_expansion_inhibited = 1;
+#endif
+}
+
+void
+bash_history_enable ()
+{
+ remember_on_history = 1;
+#if defined (BANG_HISTORY)
+ history_expansion_inhibited = 0;
+#endif
+ history_inhibit_expansion_function = bash_history_inhibit_expansion;
+ sv_history_control ("HISTCONTROL");
+ sv_histignore ("HISTIGNORE");
+}
+
+/* Load the history list from the history file. */
+void
+load_history ()
+{
+ char *hf;
+
+ /* Truncate history file for interactive shells which desire it.
+ Note that the history file is automatically truncated to the
+ size of HISTSIZE if the user does not explicitly set the size
+ differently. */
+ set_if_not ("HISTSIZE", "500");
+ sv_histsize ("HISTSIZE");
+
+ set_if_not ("HISTFILESIZE", get_string_value ("HISTSIZE"));
+ sv_histsize ("HISTFILESIZE");
+
+ /* Read the history in HISTFILE into the history list. */
+ hf = get_string_value ("HISTFILE");
+
+ if (hf && *hf && file_exists (hf))
+ {
+ read_history (hf);
+ using_history ();
+ history_lines_in_file = where_history ();
+ }
+}
+
+void
+bash_clear_history ()
+{
+ clear_history ();
+ history_lines_this_session = 0;
+}
+
+/* Delete and free the history list entry at offset I. */
+int
+bash_delete_histent (i)
+ int i;
+{
+ HIST_ENTRY *discard;
+
+ discard = remove_history (i);
+ if (discard)
+ free_history_entry (discard);
+ history_lines_this_session--;
+
+ return 1;
+}
+
+int
+bash_delete_last_history ()
+{
+ register int i;
+ HIST_ENTRY **hlist, *histent;
+ int r;
+
+ hlist = history_list ();
+ if (hlist == NULL)
+ return 0;
+
+ for (i = 0; hlist[i]; i++)
+ ;
+ i--;
+
+ /* History_get () takes a parameter that must be offset by history_base. */
+ histent = history_get (history_base + i); /* Don't free this */
+ if (histent == NULL)
+ return 0;
+
+ r = bash_delete_histent (i);
+
+ if (where_history () > history_length)
+ history_set_pos (history_length);
+
+ return r;
+}
+
+#ifdef INCLUDE_UNUSED
+/* Write the existing history out to the history file. */
+void
+save_history ()
+{
+ char *hf;
+
+ hf = get_string_value ("HISTFILE");
+ if (hf && *hf && file_exists (hf))
+ {
+ /* Append only the lines that occurred this session to
+ the history file. */
+ using_history ();
+
+ if (history_lines_this_session < where_history () || force_append_history)
+ append_history (history_lines_this_session, hf);
+ else
+ write_history (hf);
+ sv_histsize ("HISTFILESIZE");
+ }
+}
+#endif
+
+int
+maybe_append_history (filename)
+ char *filename;
+{
+ int fd, result;
+ struct stat buf;
+
+ result = EXECUTION_SUCCESS;
+ if (history_lines_this_session && (history_lines_this_session < where_history ()))
+ {
+ /* If the filename was supplied, then create it if necessary. */
+ if (stat (filename, &buf) == -1 && errno == ENOENT)
+ {
+ fd = open (filename, O_WRONLY|O_CREAT, 0600);
+ if (fd < 0)
+ {
+ builtin_error (_("%s: cannot create: %s"), filename, strerror (errno));
+ return (EXECUTION_FAILURE);
+ }
+ close (fd);
+ }
+ result = append_history (history_lines_this_session, filename);
+ history_lines_in_file += history_lines_this_session;
+ history_lines_this_session = 0;
+ }
+ return (result);
+}
+
+/* If this is an interactive shell, then append the lines executed
+ this session to the history file. */
+int
+maybe_save_shell_history ()
+{
+ int result;
+ char *hf;
+
+ result = 0;
+ if (history_lines_this_session)
+ {
+ hf = get_string_value ("HISTFILE");
+
+ if (hf && *hf)
+ {
+ /* If the file doesn't exist, then create it. */
+ if (file_exists (hf) == 0)
+ {
+ int file;
+ file = open (hf, O_CREAT | O_TRUNC | O_WRONLY, 0600);
+ if (file != -1)
+ close (file);
+ }
+
+ /* Now actually append the lines if the history hasn't been
+ stifled. If the history has been stifled, rewrite the
+ history file. */
+ using_history ();
+ if (history_lines_this_session <= where_history () || force_append_history)
+ {
+ result = append_history (history_lines_this_session, hf);
+ history_lines_in_file += history_lines_this_session;
+ }
+ else
+ {
+ result = write_history (hf);
+ history_lines_in_file = history_lines_this_session;
+ }
+ history_lines_this_session = 0;
+
+ sv_histsize ("HISTFILESIZE");
+ }
+ }
+ return (result);
+}
+
+#if defined (READLINE)
+/* Tell readline () that we have some text for it to edit. */
+static void
+re_edit (text)
+ char *text;
+{
+ if (bash_input.type == st_stdin)
+ bash_re_edit (text);
+}
+#endif /* READLINE */
+
+/* Return 1 if this line needs history expansion. */
+static int
+history_expansion_p (line)
+ char *line;
+{
+ register char *s;
+
+ for (s = line; *s; s++)
+ if (*s == history_expansion_char || *s == history_subst_char)
+ return 1;
+ return 0;
+}
+
+/* Do pre-processing on LINE. If PRINT_CHANGES is non-zero, then
+ print the results of expanding the line if there were any changes.
+ If there is an error, return NULL, otherwise the expanded line is
+ returned. If ADDIT is non-zero the line is added to the history
+ list after history expansion. ADDIT is just a suggestion;
+ REMEMBER_ON_HISTORY can veto, and does.
+ Right now this does history expansion. */
+char *
+pre_process_line (line, print_changes, addit)
+ char *line;
+ int print_changes, addit;
+{
+ char *history_value;
+ char *return_value;
+ int expanded;
+
+ return_value = line;
+ expanded = 0;
+
+# if defined (BANG_HISTORY)
+ /* History expand the line. If this results in no errors, then
+ add that line to the history if ADDIT is non-zero. */
+ if (!history_expansion_inhibited && history_expansion && history_expansion_p (line))
+ {
+ expanded = history_expand (line, &history_value);
+
+ if (expanded)
+ {
+ if (print_changes)
+ {
+ if (expanded < 0)
+ internal_error ("%s", history_value);
+#if defined (READLINE)
+ else if (hist_verify == 0 || expanded == 2)
+#else
+ else
+#endif
+ fprintf (stderr, "%s\n", history_value);
+ }
+
+ /* If there was an error, return NULL. */
+ if (expanded < 0 || expanded == 2) /* 2 == print only */
+ {
+# if defined (READLINE)
+ if (expanded == 2 && rl_dispatching == 0 && *history_value)
+# else
+ if (expanded == 2 && *history_value)
+# endif /* !READLINE */
+ maybe_add_history (history_value);
+
+ free (history_value);
+
+# if defined (READLINE)
+ /* New hack. We can allow the user to edit the
+ failed history expansion. */
+ if (history_reediting && expanded < 0 && rl_done)
+ re_edit (line);
+# endif /* READLINE */
+ return ((char *)NULL);
+ }
+
+# if defined (READLINE)
+ if (hist_verify && expanded == 1)
+ {
+ re_edit (history_value);
+ return ((char *)NULL);
+ }
+# endif
+ }
+
+ /* Let other expansions know that return_value can be free'ed,
+ and that a line has been added to the history list. Note
+ that we only add lines that have something in them. */
+ expanded = 1;
+ return_value = history_value;
+ }
+# endif /* BANG_HISTORY */
+
+ if (addit && remember_on_history && *return_value)
+ maybe_add_history (return_value);
+
+#if 0
+ if (expanded == 0)
+ return_value = savestring (line);
+#endif
+
+ return (return_value);
+}
+
+/* Return 1 if the first non-whitespace character in LINE is a `#', indicating
+ * that the line is a shell comment. */
+static int
+shell_comment (line)
+ char *line;
+{
+ char *p;
+
+ for (p = line; p && *p && whitespace (*p); p++)
+ ;
+ return (p && *p == '#');
+}
+
+#ifdef INCLUDE_UNUSED
+/* Remove shell comments from LINE. A `#' and anything after it is a comment.
+ This isn't really useful yet, since it doesn't handle quoting. */
+static char *
+filter_comments (line)
+ char *line;
+{
+ char *p;
+
+ for (p = line; p && *p && *p != '#'; p++)
+ ;
+ if (p && *p == '#')
+ *p = '\0';
+ return (line);
+}
+#endif
+
+/* Check LINE against what HISTCONTROL says to do. Returns 1 if the line
+ should be saved; 0 if it should be discarded. */
+static int
+check_history_control (line)
+ char *line;
+{
+ HIST_ENTRY *temp;
+ int r;
+
+ if (history_control == 0)
+ return 1;
+
+ /* ignorespace or ignoreboth */
+ if ((history_control & HC_IGNSPACE) && *line == ' ')
+ return 0;
+
+ /* ignoredups or ignoreboth */
+ if (history_control & HC_IGNDUPS)
+ {
+ using_history ();
+ temp = previous_history ();
+
+ r = (temp == 0 || STREQ (temp->line, line) == 0);
+
+ using_history ();
+
+ if (r == 0)
+ return r;
+ }
+
+ return 1;
+}
+
+/* Remove all entries matching LINE from the history list. Triggered when
+ HISTCONTROL includes `erasedups'. */
+static void
+hc_erasedups (line)
+ char *line;
+{
+ HIST_ENTRY *temp;
+ int r;
+
+ using_history ();
+ while (temp = previous_history ())
+ {
+ if (STREQ (temp->line, line))
+ {
+ r = where_history ();
+ remove_history (r);
+ }
+ }
+ using_history ();
+}
+
+/* Add LINE to the history list, handling possibly multi-line compound
+ commands. We note whether or not we save the first line of each command
+ (which is usually the entire command and history entry), and don't add
+ the second and subsequent lines of a multi-line compound command if we
+ didn't save the first line. We don't usually save shell comment lines in
+ compound commands in the history, because they could have the effect of
+ commenting out the rest of the command when the entire command is saved as
+ a single history entry (when COMMAND_ORIENTED_HISTORY is enabled). If
+ LITERAL_HISTORY is set, we're saving lines in the history with embedded
+ newlines, so it's OK to save comment lines. We also make sure to save
+ multiple-line quoted strings or other constructs. */
+void
+maybe_add_history (line)
+ char *line;
+{
+ hist_last_line_added = 0;
+
+ /* Don't use the value of history_control to affect the second
+ and subsequent lines of a multi-line command (old code did
+ this only when command_oriented_history is enabled). */
+ if (current_command_line_count > 1)
+ {
+ if (current_command_first_line_saved &&
+ (literal_history || dstack.delimiter_depth != 0 || shell_comment (line) == 0))
+ bash_add_history (line);
+ return;
+ }
+
+ /* This is the first line of a (possible multi-line) command. Note whether
+ or not we should save the first line and remember it. */
+ current_command_first_line_saved = check_add_history (line, 0);
+}
+
+/* Just check LINE against HISTCONTROL and HISTIGNORE and add it to the
+ history if it's OK. Used by `history -s' as well as maybe_add_history().
+ Returns 1 if the line was saved in the history, 0 otherwise. */
+int
+check_add_history (line, force)
+ char *line;
+ int force;
+{
+ if (check_history_control (line) && history_should_ignore (line) == 0)
+ {
+ /* We're committed to saving the line. If the user has requested it,
+ remove other matching lines from the history. */
+ if (history_control & HC_ERASEDUPS)
+ hc_erasedups (line);
+
+ if (force)
+ {
+ really_add_history (line);
+ using_history ();
+ }
+ else
+ bash_add_history (line);
+ return 1;
+ }
+ return 0;
+}
+
+#if defined (SYSLOG_HISTORY)
+#define SYSLOG_MAXLEN 600
+
+void
+bash_syslog_history (line)
+ const char *line;
+{
+ char trunc[SYSLOG_MAXLEN];
+
+ if (strlen(line) < SYSLOG_MAXLEN)
+ syslog (SYSLOG_FACILITY|SYSLOG_LEVEL, "HISTORY: PID=%d UID=%d %s", getpid(), current_user.uid, line);
+ else
+ {
+ strncpy (trunc, line, SYSLOG_MAXLEN);
+ trunc[SYSLOG_MAXLEN - 1] = '\0';
+ syslog (SYSLOG_FACILITY|SYSLOG_LEVEL, "HISTORY (TRUNCATED): PID=%d UID=%d %s", getpid(), current_user.uid, trunc);
+ }
+}
+#endif
+
+/* Add a line to the history list.
+ The variable COMMAND_ORIENTED_HISTORY controls the style of history
+ remembering; when non-zero, and LINE is not the first line of a
+ complete parser construct, append LINE to the last history line instead
+ of adding it as a new line. */
+void
+bash_add_history (line)
+ char *line;
+{
+ int add_it, offset, curlen;
+ HIST_ENTRY *current, *old;
+ char *chars_to_add, *new_line;
+
+ add_it = 1;
+ if (command_oriented_history && current_command_line_count > 1)
+ {
+ chars_to_add = literal_history ? "\n" : history_delimiting_chars ();
+
+ using_history ();
+ current = previous_history ();
+
+ if (current)
+ {
+ /* If the previous line ended with an escaped newline (escaped
+ with backslash, but otherwise unquoted), then remove the quoted
+ newline, since that is what happens when the line is parsed. */
+ curlen = strlen (current->line);
+
+ if (dstack.delimiter_depth == 0 && current->line[curlen - 1] == '\\' &&
+ current->line[curlen - 2] != '\\')
+ {
+ current->line[curlen - 1] = '\0';
+ curlen--;
+ chars_to_add = "";
+ }
+
+ new_line = (char *)xmalloc (1
+ + curlen
+ + strlen (line)
+ + strlen (chars_to_add));
+ sprintf (new_line, "%s%s%s", current->line, chars_to_add, line);
+ offset = where_history ();
+ old = replace_history_entry (offset, new_line, current->data);
+ free (new_line);
+
+ if (old)
+ free_history_entry (old);
+
+ add_it = 0;
+ }
+ }
+
+ if (add_it)
+ really_add_history (line);
+
+#if defined (SYSLOG_HISTORY)
+ bash_syslog_history (line);
+#endif
+
+ using_history ();
+}
+
+static void
+really_add_history (line)
+ char *line;
+{
+ hist_last_line_added = 1;
+ hist_last_line_pushed = 0;
+ add_history (line);
+ history_lines_this_session++;
+}
+
+int
+history_number ()
+{
+ using_history ();
+ return (remember_on_history ? history_base + where_history () : 1);
+}
+
+static int
+should_expand (s)
+ char *s;
+{
+ char *p;
+
+ for (p = s; p && *p; p++)
+ {
+ if (*p == '\\')
+ p++;
+ else if (*p == '&')
+ return 1;
+ }
+ return 0;
+}
+
+static int
+histignore_item_func (ign)
+ struct ign *ign;
+{
+ if (should_expand (ign->val))
+ ign->flags |= HIGN_EXPAND;
+ return (0);
+}
+
+void
+setup_history_ignore (varname)
+ char *varname;
+{
+ setup_ignore_patterns (&histignore);
+}
+
+static HIST_ENTRY *
+last_history_entry ()
+{
+ HIST_ENTRY *he;
+
+ using_history ();
+ he = previous_history ();
+ using_history ();
+ return he;
+}
+
+char *
+last_history_line ()
+{
+ HIST_ENTRY *he;
+
+ he = last_history_entry ();
+ if (he == 0)
+ return ((char *)NULL);
+ return he->line;
+}
+
+static char *
+expand_histignore_pattern (pat)
+ char *pat;
+{
+ HIST_ENTRY *phe;
+ char *ret;
+
+ phe = last_history_entry ();
+
+ if (phe == (HIST_ENTRY *)0)
+ return (savestring (pat));
+
+ ret = strcreplace (pat, '&', phe->line, 1);
+
+ return ret;
+}
+
+/* Return 1 if we should not put LINE into the history according to the
+ patterns in HISTIGNORE. */
+static int
+history_should_ignore (line)
+ char *line;
+{
+ register int i, match;
+ char *npat;
+
+ if (histignore.num_ignores == 0)
+ return 0;
+
+ for (i = match = 0; i < histignore.num_ignores; i++)
+ {
+ if (histignore.ignores[i].flags & HIGN_EXPAND)
+ npat = expand_histignore_pattern (histignore.ignores[i].val);
+ else
+ npat = histignore.ignores[i].val;
+
+ match = strmatch (npat, line, FNMATCH_EXTFLAG) != FNM_NOMATCH;
+
+ if (histignore.ignores[i].flags & HIGN_EXPAND)
+ free (npat);
+
+ if (match)
+ break;
+ }
+
+ return match;
+}
+#endif /* HISTORY */
--- /dev/null
+/* redir.c -- Functions to perform input and output redirection. */
+
+/* Copyright (C) 1997-2009 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 (__GNUC__) && !defined (HAVE_ALLOCA_H) && defined (_AIX)
+ #pragma alloca
+#endif /* _AIX && RISC6000 && !__GNUC__ */
+
+#include <stdio.h>
+#include "bashtypes.h"
+#if !defined (_MINIX) && defined (HAVE_SYS_FILE_H)
+# include <sys/file.h>
+#endif
+#include "filecntl.h"
+#include "posixstat.h"
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif
+
+#include <errno.h>
+
+#if !defined (errno)
+extern int errno;
+#endif
+
+#include "bashansi.h"
+#include "bashintl.h"
+#include "memalloc.h"
+
+#define NEED_FPURGE_DECL
+
+#include "shell.h"
+#include "flags.h"
+#include "execute_cmd.h"
+#include "redir.h"
+
+#if defined (BUFFERED_INPUT)
+# include "input.h"
+#endif
+
+#define SHELL_FD_BASE 10
+
+int expanding_redir;
+
+extern int posixly_correct;
+extern REDIRECT *redirection_undo_list;
+extern REDIRECT *exec_redirection_undo_list;
+
+/* Static functions defined and used in this file. */
+static void add_undo_close_redirect __P((int));
+static void add_exec_redirect __P((REDIRECT *));
+static int add_undo_redirect __P((int, enum r_instruction, int));
+static int expandable_redirection_filename __P((REDIRECT *));
+static int stdin_redirection __P((enum r_instruction, int));
+static int undoablefd __P((int));
+static int do_redirection_internal __P((REDIRECT *, int));
+
+static int write_here_document __P((int, WORD_DESC *));
+static int write_here_string __P((int, WORD_DESC *));
+static int here_document_to_fd __P((WORD_DESC *, enum r_instruction));
+
+static int redir_special_open __P((int, char *, int, int, enum r_instruction));
+static int noclobber_open __P((char *, int, int, enum r_instruction));
+static int redir_open __P((char *, int, int, enum r_instruction));
+
+static int redir_varassign __P((REDIRECT *, int));
+static int redir_varvalue __P((REDIRECT *));
+
+/* Spare redirector used when translating [N]>&WORD[-] or [N]<&WORD[-] to
+ a new redirection and when creating the redirection undo list. */
+static REDIRECTEE rd;
+
+/* Set to errno when a here document cannot be created for some reason.
+ Used to print a reasonable error message. */
+static int heredoc_errno;
+
+void
+redirection_error (temp, error)
+ REDIRECT *temp;
+ int error;
+{
+ char *filename, *allocname;
+ int oflags;
+
+ allocname = 0;
+ if (temp->rflags & REDIR_VARASSIGN)
+ filename = savestring (temp->redirector.filename->word);
+ else if (temp->redirector.dest < 0)
+ /* This can happen when read_token_word encounters overflow, like in
+ exec 4294967297>x */
+ filename = _("file descriptor out of range");
+#ifdef EBADF
+ /* This error can never involve NOCLOBBER */
+ else if (error != NOCLOBBER_REDIRECT && temp->redirector.dest >= 0 && error == EBADF)
+ {
+ /* If we're dealing with two file descriptors, we have to guess about
+ which one is invalid; in the cases of r_{duplicating,move}_input and
+ r_{duplicating,move}_output we're here because dup2() failed. */
+ switch (temp->instruction)
+ {
+ case r_duplicating_input:
+ case r_duplicating_output:
+ case r_move_input:
+ case r_move_output:
+ filename = allocname = itos (temp->redirectee.dest);
+ break;
+ case r_duplicating_input_word:
+ if (temp->redirector.dest == 0) /* Guess */
+ filename = temp->redirectee.filename->word; /* XXX */
+ else
+ filename = allocname = itos (temp->redirector.dest);
+ break;
+ case r_duplicating_output_word:
+ if (temp->redirector.dest == 1) /* Guess */
+ filename = temp->redirectee.filename->word; /* XXX */
+ else
+ filename = allocname = itos (temp->redirector.dest);
+ break;
+ default:
+ filename = allocname = itos (temp->redirector.dest);
+ break;
+ }
+ }
+#endif
+ else if (expandable_redirection_filename (temp))
+ {
+expandable_filename:
+ if (posixly_correct && interactive_shell == 0)
+ {
+ oflags = temp->redirectee.filename->flags;
+ temp->redirectee.filename->flags |= W_NOGLOB;
+ }
+ filename = allocname = redirection_expand (temp->redirectee.filename);
+ if (posixly_correct && interactive_shell == 0)
+ temp->redirectee.filename->flags = oflags;
+ if (filename == 0)
+ filename = temp->redirectee.filename->word;
+ }
+ else if (temp->redirectee.dest < 0)
+ filename = "file descriptor out of range";
+ else
+ filename = allocname = itos (temp->redirectee.dest);
+
+ switch (error)
+ {
+ case AMBIGUOUS_REDIRECT:
+ internal_error (_("%s: ambiguous redirect"), filename);
+ break;
+
+ case NOCLOBBER_REDIRECT:
+ internal_error (_("%s: cannot overwrite existing file"), filename);
+ break;
+
+#if defined (RESTRICTED_SHELL)
+ case RESTRICTED_REDIRECT:
+ internal_error (_("%s: restricted: cannot redirect output"), filename);
+ break;
+#endif /* RESTRICTED_SHELL */
+
+ case HEREDOC_REDIRECT:
+ internal_error (_("cannot create temp file for here-document: %s"), strerror (heredoc_errno));
+ break;
+
+ case BADVAR_REDIRECT:
+ internal_error (_("%s: cannot assign fd to variable"), filename);
+ break;
+
+ default:
+ internal_error ("%s: %s", filename, strerror (error));
+ break;
+ }
+
+ FREE (allocname);
+}
+
+/* Perform the redirections on LIST. If flags & RX_ACTIVE, then actually
+ make input and output file descriptors, otherwise just do whatever is
+ neccessary for side effecting. flags & RX_UNDOABLE says to remember
+ how to undo the redirections later, if non-zero. If flags & RX_CLEXEC
+ is non-zero, file descriptors opened in do_redirection () have their
+ close-on-exec flag set. */
+int
+do_redirections (list, flags)
+ REDIRECT *list;
+ int flags;
+{
+ int error;
+ REDIRECT *temp;
+
+ if (flags & RX_UNDOABLE)
+ {
+ if (redirection_undo_list)
+ {
+ dispose_redirects (redirection_undo_list);
+ redirection_undo_list = (REDIRECT *)NULL;
+ }
+ if (exec_redirection_undo_list)
+ dispose_exec_redirects ();
+ }
+
+ for (temp = list; temp; temp = temp->next)
+ {
+ error = do_redirection_internal (temp, flags);
+ if (error)
+ {
+ redirection_error (temp, error);
+ return (error);
+ }
+ }
+ return (0);
+}
+
+/* Return non-zero if the redirection pointed to by REDIRECT has a
+ redirectee.filename that can be expanded. */
+static int
+expandable_redirection_filename (redirect)
+ REDIRECT *redirect;
+{
+ switch (redirect->instruction)
+ {
+ case r_output_direction:
+ case r_appending_to:
+ case r_input_direction:
+ case r_inputa_direction:
+ case r_err_and_out:
+ case r_append_err_and_out:
+ case r_input_output:
+ case r_output_force:
+ case r_duplicating_input_word:
+ case r_duplicating_output_word:
+ case r_move_input_word:
+ case r_move_output_word:
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
+/* Expand the word in WORD returning a string. If WORD expands to
+ multiple words (or no words), then return NULL. */
+char *
+redirection_expand (word)
+ WORD_DESC *word;
+{
+ char *result;
+ WORD_LIST *tlist1, *tlist2;
+ WORD_DESC *w;
+
+ w = copy_word (word);
+ if (posixly_correct)
+ w->flags |= W_NOSPLIT;
+
+ tlist1 = make_word_list (w, (WORD_LIST *)NULL);
+ expanding_redir = 1;
+ tlist2 = expand_words_no_vars (tlist1);
+ expanding_redir = 0;
+ dispose_words (tlist1);
+
+ if (!tlist2 || tlist2->next)
+ {
+ /* We expanded to no words, or to more than a single word.
+ Dispose of the word list and return NULL. */
+ if (tlist2)
+ dispose_words (tlist2);
+ return ((char *)NULL);
+ }
+ result = string_list (tlist2); /* XXX savestring (tlist2->word->word)? */
+ dispose_words (tlist2);
+ return (result);
+}
+
+static int
+write_here_string (fd, redirectee)
+ int fd;
+ WORD_DESC *redirectee;
+{
+ char *herestr;
+ int herelen, n, e;
+
+ expanding_redir = 1;
+ herestr = expand_string_to_string (redirectee->word, 0);
+ expanding_redir = 0;
+ herelen = STRLEN (herestr);
+
+ n = write (fd, herestr, herelen);
+ if (n == herelen)
+ {
+ n = write (fd, "\n", 1);
+ herelen = 1;
+ }
+ e = errno;
+ FREE (herestr);
+ if (n != herelen)
+ {
+ if (e == 0)
+ e = ENOSPC;
+ return e;
+ }
+ return 0;
+}
+
+/* Write the text of the here document pointed to by REDIRECTEE to the file
+ descriptor FD, which is already open to a temp file. Return 0 if the
+ write is successful, otherwise return errno. */
+static int
+write_here_document (fd, redirectee)
+ int fd;
+ WORD_DESC *redirectee;
+{
+ char *document;
+ int document_len, fd2;
+ FILE *fp;
+ register WORD_LIST *t, *tlist;
+
+ /* Expand the text if the word that was specified had
+ no quoting. The text that we expand is treated
+ exactly as if it were surrounded by double quotes. */
+
+ if (redirectee->flags & W_QUOTED)
+ {
+ document = redirectee->word;
+ document_len = strlen (document);
+ /* Set errno to something reasonable if the write fails. */
+ if (write (fd, document, document_len) < document_len)
+ {
+ if (errno == 0)
+ errno = ENOSPC;
+ return (errno);
+ }
+ else
+ return 0;
+ }
+
+ expanding_redir = 1;
+ tlist = expand_string (redirectee->word, Q_HERE_DOCUMENT);
+ expanding_redir = 0;
+
+ if (tlist)
+ {
+ /* Try using buffered I/O (stdio) and writing a word
+ at a time, letting stdio do the work of buffering
+ for us rather than managing our own strings. Most
+ stdios are not particularly fast, however -- this
+ may need to be reconsidered later. */
+ if ((fd2 = dup (fd)) < 0 || (fp = fdopen (fd2, "w")) == NULL)
+ {
+ if (fd2 >= 0)
+ close (fd2);
+ return (errno);
+ }
+ errno = 0;
+ for (t = tlist; t; t = t->next)
+ {
+ /* This is essentially the body of
+ string_list_internal expanded inline. */
+ document = t->word->word;
+ document_len = strlen (document);
+ if (t != tlist)
+ putc (' ', fp); /* separator */
+ fwrite (document, document_len, 1, fp);
+ if (ferror (fp))
+ {
+ if (errno == 0)
+ errno = ENOSPC;
+ fd2 = errno;
+ fclose(fp);
+ dispose_words (tlist);
+ return (fd2);
+ }
+ }
+ dispose_words (tlist);
+ if (fclose (fp) != 0)
+ {
+ if (errno == 0)
+ errno = ENOSPC;
+ return (errno);
+ }
+ }
+ return 0;
+}
+
+/* Create a temporary file holding the text of the here document pointed to
+ by REDIRECTEE, and return a file descriptor open for reading to the temp
+ file. Return -1 on any error, and make sure errno is set appropriately. */
+static int
+here_document_to_fd (redirectee, ri)
+ WORD_DESC *redirectee;
+ enum r_instruction ri;
+{
+ char *filename;
+ int r, fd, fd2;
+
+ fd = sh_mktmpfd ("sh-thd", MT_USERANDOM|MT_USETMPDIR, &filename);
+
+ /* If we failed for some reason other than the file existing, abort */
+ if (fd < 0)
+ {
+ FREE (filename);
+ return (fd);
+ }
+
+ errno = r = 0; /* XXX */
+ /* write_here_document returns 0 on success, errno on failure. */
+ if (redirectee->word)
+ r = (ri != r_reading_string) ? write_here_document (fd, redirectee)
+ : write_here_string (fd, redirectee);
+
+ if (r)
+ {
+ close (fd);
+ unlink (filename);
+ free (filename);
+ errno = r;
+ return (-1);
+ }
+
+ /* In an attempt to avoid races, we close the first fd only after opening
+ the second. */
+ /* Make the document really temporary. Also make it the input. */
+ fd2 = open (filename, O_RDONLY, 0600);
+
+itrace("here_document_to_fd: %s open read-only to fd %d", filename, fd2);
+ if (fd2 < 0)
+ {
+ r = errno;
+ unlink (filename);
+ free (filename);
+ close (fd);
+ errno = r;
+ return -1;
+ }
+
+ close (fd);
+ if (unlink (filename) < 0)
+ {
+ r = errno;
+#if defined (__CYGWIN__)
+ /* Under CygWin 1.1.0, the unlink will fail if the file is
+ open. This hack will allow the previous action of silently
+ ignoring the error, but will still leave the file there. This
+ needs some kind of magic. */
+ if (r == EACCES)
+ return (fd2);
+#endif /* __CYGWIN__ */
+ close (fd2);
+ free (filename);
+ errno = r;
+ return (-1);
+ }
+
+ free (filename);
+ return (fd2);
+}
+
+#define RF_DEVFD 1
+#define RF_DEVSTDERR 2
+#define RF_DEVSTDIN 3
+#define RF_DEVSTDOUT 4
+#define RF_DEVTCP 5
+#define RF_DEVUDP 6
+
+/* A list of pattern/value pairs for filenames that the redirection
+ code handles specially. */
+static STRING_INT_ALIST _redir_special_filenames[] = {
+#if !defined (HAVE_DEV_FD)
+ { "/dev/fd/[0-9]*", RF_DEVFD },
+#endif
+#if !defined (HAVE_DEV_STDIN)
+ { "/dev/stderr", RF_DEVSTDERR },
+ { "/dev/stdin", RF_DEVSTDIN },
+ { "/dev/stdout", RF_DEVSTDOUT },
+#endif
+#if defined (NETWORK_REDIRECTIONS)
+ { "/dev/tcp/*/*", RF_DEVTCP },
+ { "/dev/udp/*/*", RF_DEVUDP },
+#endif
+ { (char *)NULL, -1 }
+};
+
+static int
+redir_special_open (spec, filename, flags, mode, ri)
+ int spec;
+ char *filename;
+ int flags, mode;
+ enum r_instruction ri;
+{
+ int fd;
+#if !defined (HAVE_DEV_FD)
+ intmax_t lfd;
+#endif
+
+ fd = -1;
+ switch (spec)
+ {
+#if !defined (HAVE_DEV_FD)
+ case RF_DEVFD:
+ if (all_digits (filename+8) && legal_number (filename+8, &lfd) && lfd == (int)lfd)
+ {
+ fd = lfd;
+ fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE);
+ }
+ else
+ fd = AMBIGUOUS_REDIRECT;
+ break;
+#endif
+
+#if !defined (HAVE_DEV_STDIN)
+ case RF_DEVSTDIN:
+ fd = fcntl (0, F_DUPFD, SHELL_FD_BASE);
+ break;
+ case RF_DEVSTDOUT:
+ fd = fcntl (1, F_DUPFD, SHELL_FD_BASE);
+ break;
+ case RF_DEVSTDERR:
+ fd = fcntl (2, F_DUPFD, SHELL_FD_BASE);
+ break;
+#endif
+
+#if defined (NETWORK_REDIRECTIONS)
+ case RF_DEVTCP:
+ case RF_DEVUDP:
+#if defined (HAVE_NETWORK)
+ fd = netopen (filename);
+#else
+ internal_warning (_("/dev/(tcp|udp)/host/port not supported without networking"));
+ fd = open (filename, flags, mode);
+#endif
+ break;
+#endif /* NETWORK_REDIRECTIONS */
+ }
+
+ return fd;
+}
+
+/* Open FILENAME with FLAGS in noclobber mode, hopefully avoiding most
+ race conditions and avoiding the problem where the file is replaced
+ between the stat(2) and open(2). */
+static int
+noclobber_open (filename, flags, mode, ri)
+ char *filename;
+ int flags, mode;
+ enum r_instruction ri;
+{
+ int r, fd;
+ struct stat finfo, finfo2;
+
+ /* If the file exists and is a regular file, return an error
+ immediately. */
+ r = stat (filename, &finfo);
+ if (r == 0 && (S_ISREG (finfo.st_mode)))
+ return (NOCLOBBER_REDIRECT);
+
+ /* If the file was not present (r != 0), make sure we open it
+ exclusively so that if it is created before we open it, our open
+ will fail. Make sure that we do not truncate an existing file.
+ Note that we don't turn on O_EXCL unless the stat failed -- if
+ the file was not a regular file, we leave O_EXCL off. */
+ flags &= ~O_TRUNC;
+ if (r != 0)
+ {
+ fd = open (filename, flags|O_EXCL, mode);
+ return ((fd < 0 && errno == EEXIST) ? NOCLOBBER_REDIRECT : fd);
+ }
+ fd = open (filename, flags, mode);
+
+ /* If the open failed, return the file descriptor right away. */
+ if (fd < 0)
+ return (errno == EEXIST ? NOCLOBBER_REDIRECT : fd);
+
+ /* OK, the open succeeded, but the file may have been changed from a
+ non-regular file to a regular file between the stat and the open.
+ We are assuming that the O_EXCL open handles the case where FILENAME
+ did not exist and is symlinked to an existing file between the stat
+ and open. */
+
+ /* If we can open it and fstat the file descriptor, and neither check
+ revealed that it was a regular file, and the file has not been replaced,
+ return the file descriptor. */
+ if ((fstat (fd, &finfo2) == 0) && (S_ISREG (finfo2.st_mode) == 0) &&
+ r == 0 && (S_ISREG (finfo.st_mode) == 0) &&
+ same_file (filename, filename, &finfo, &finfo2))
+ return fd;
+
+ /* The file has been replaced. badness. */
+ close (fd);
+ errno = EEXIST;
+ return (NOCLOBBER_REDIRECT);
+}
+
+static int
+redir_open (filename, flags, mode, ri)
+ char *filename;
+ int flags, mode;
+ enum r_instruction ri;
+{
+ int fd, r;
+
+ r = find_string_in_alist (filename, _redir_special_filenames, 1);
+ if (r >= 0)
+ return (redir_special_open (r, filename, flags, mode, ri));
+
+ /* If we are in noclobber mode, you are not allowed to overwrite
+ existing files. Check before opening. */
+ if (noclobber && CLOBBERING_REDIRECT (ri))
+ {
+ fd = noclobber_open (filename, flags, mode, ri);
+ if (fd == NOCLOBBER_REDIRECT)
+ return (NOCLOBBER_REDIRECT);
+ }
+ else
+ {
+ fd = open (filename, flags, mode);
+#if defined (AFS)
+ if ((fd < 0) && (errno == EACCES))
+ {
+ fd = open (filename, flags & ~O_CREAT, mode);
+ errno = EACCES; /* restore errno */
+ }
+#endif /* AFS */
+ }
+
+itrace("redir_open: %s opens to fd %d", filename, fd);
+ return fd;
+}
+
+static int
+undoablefd (fd)
+ int fd;
+{
+ int clexec;
+
+ clexec = fcntl (fd, F_GETFD, 0);
+ if (clexec == -1 || (fd >= SHELL_FD_BASE && clexec == 1))
+ return 0;
+ return 1;
+}
+
+/* Do the specific redirection requested. Returns errno or one of the
+ special redirection errors (*_REDIRECT) in case of error, 0 on success.
+ If flags & RX_ACTIVE is zero, then just do whatever is neccessary to
+ produce the appropriate side effects. flags & RX_UNDOABLE, if non-zero,
+ says to remember how to undo each redirection. If flags & RX_CLEXEC is
+ non-zero, then we set all file descriptors > 2 that we open to be
+ close-on-exec. */
+static int
+do_redirection_internal (redirect, flags)
+ REDIRECT *redirect;
+ int flags;
+{
+ WORD_DESC *redirectee;
+ int redir_fd, fd, redirector, r, oflags;
+ intmax_t lfd;
+ char *redirectee_word;
+ enum r_instruction ri;
+ REDIRECT *new_redirect;
+ REDIRECTEE sd;
+
+ redirectee = redirect->redirectee.filename;
+ redir_fd = redirect->redirectee.dest;
+ redirector = redirect->redirector.dest;
+ ri = redirect->instruction;
+
+ if (redirect->flags & RX_INTERNAL)
+ flags |= RX_INTERNAL;
+
+ if (TRANSLATE_REDIRECT (ri))
+ {
+ /* We have [N]>&WORD[-] or [N]<&WORD[-] (or {V}>&WORD[-] or {V}<&WORD-).
+ and WORD, then translate the redirection into a new one and
+ continue. */
+ redirectee_word = redirection_expand (redirectee);
+
+ /* XXX - what to do with [N]<&$w- where w is unset or null? ksh93
+ closes N. */
+ if (redirectee_word == 0)
+ return (AMBIGUOUS_REDIRECT);
+ else if (redirectee_word[0] == '-' && redirectee_word[1] == '\0')
+ {
+ sd = redirect->redirector;
+ rd.dest = 0;
+ new_redirect = make_redirection (sd, r_close_this, rd, 0);
+ }
+ else if (all_digits (redirectee_word))
+ {
+ sd = redirect->redirector;
+ if (legal_number (redirectee_word, &lfd) && (int)lfd == lfd)
+ rd.dest = lfd;
+ else
+ rd.dest = -1; /* XXX */
+ switch (ri)
+ {
+ case r_duplicating_input_word:
+ new_redirect = make_redirection (sd, r_duplicating_input, rd, 0);
+ break;
+ case r_duplicating_output_word:
+ new_redirect = make_redirection (sd, r_duplicating_output, rd, 0);
+ break;
+ case r_move_input_word:
+ new_redirect = make_redirection (sd, r_move_input, rd, 0);
+ break;
+ case r_move_output_word:
+ new_redirect = make_redirection (sd, r_move_output, rd, 0);
+ break;
+ }
+ }
+ else if (ri == r_duplicating_output_word && (redirect->rflags & REDIR_VARASSIGN) == 0 && redirector == 1)
+ {
+ sd = redirect->redirector;
+ rd.filename = make_bare_word (redirectee_word);
+ new_redirect = make_redirection (sd, r_err_and_out, rd, 0);
+ }
+ else
+ {
+ free (redirectee_word);
+ return (AMBIGUOUS_REDIRECT);
+ }
+
+ free (redirectee_word);
+
+ /* Set up the variables needed by the rest of the function from the
+ new redirection. */
+ if (new_redirect->instruction == r_err_and_out)
+ {
+ char *alloca_hack;
+
+ /* Copy the word without allocating any memory that must be
+ explicitly freed. */
+ redirectee = (WORD_DESC *)alloca (sizeof (WORD_DESC));
+ xbcopy ((char *)new_redirect->redirectee.filename,
+ (char *)redirectee, sizeof (WORD_DESC));
+
+ alloca_hack = (char *)
+ alloca (1 + strlen (new_redirect->redirectee.filename->word));
+ redirectee->word = alloca_hack;
+ strcpy (redirectee->word, new_redirect->redirectee.filename->word);
+ }
+ else
+ /* It's guaranteed to be an integer, and shouldn't be freed. */
+ redirectee = new_redirect->redirectee.filename;
+
+ redir_fd = new_redirect->redirectee.dest;
+ redirector = new_redirect->redirector.dest;
+ ri = new_redirect->instruction;
+
+ /* Overwrite the flags element of the old redirect with the new value. */
+ redirect->flags = new_redirect->flags;
+ dispose_redirects (new_redirect);
+ }
+
+ switch (ri)
+ {
+ case r_output_direction:
+ case r_appending_to:
+ case r_input_direction:
+ case r_inputa_direction:
+ case r_err_and_out: /* command &>filename */
+ case r_append_err_and_out: /* command &>> filename */
+ case r_input_output:
+ case r_output_force:
+ if (posixly_correct && interactive_shell == 0)
+ {
+ oflags = redirectee->flags;
+ redirectee->flags |= W_NOGLOB;
+ }
+ redirectee_word = redirection_expand (redirectee);
+ if (posixly_correct && interactive_shell == 0)
+ redirectee->flags = oflags;
+
+ if (redirectee_word == 0)
+ return (AMBIGUOUS_REDIRECT);
+
+#if defined (RESTRICTED_SHELL)
+ if (restricted && (WRITE_REDIRECT (ri)))
+ {
+ free (redirectee_word);
+ return (RESTRICTED_REDIRECT);
+ }
+#endif /* RESTRICTED_SHELL */
+
+ fd = redir_open (redirectee_word, redirect->flags, 0666, ri);
+ free (redirectee_word);
+
+ if (fd == NOCLOBBER_REDIRECT)
+ return (fd);
+
+ if (fd < 0)
+ return (errno);
+
+ if (flags & RX_ACTIVE)
+ {
+ if (redirect->rflags & REDIR_VARASSIGN)
+ redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */
+
+ if (flags & RX_UNDOABLE)
+ {
+ /* Only setup to undo it if the thing to undo is active. */
+ if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1))
+ add_undo_redirect (redirector, ri, -1);
+ else
+ add_undo_close_redirect (redirector);
+ }
+
+#if defined (BUFFERED_INPUT)
+ check_bash_input (redirector);
+#endif
+
+ /* Make sure there is no pending output before we change the state
+ of the underlying file descriptor, since the builtins use stdio
+ for output. */
+ if (redirector == 1 && fileno (stdout) == redirector)
+ {
+ fflush (stdout);
+ fpurge (stdout);
+ }
+ else if (redirector == 2 && fileno (stderr) == redirector)
+ {
+ fflush (stderr);
+ fpurge (stderr);
+ }
+
+ if (redirect->rflags & REDIR_VARASSIGN)
+ {
+ if ((r = redir_varassign (redirect, redirector)) < 0)
+ {
+ close (redirector);
+ close (fd);
+ return (r); /* XXX */
+ }
+ }
+ else if ((fd != redirector) && (dup2 (fd, redirector) < 0))
+ return (errno);
+
+#if defined (BUFFERED_INPUT)
+ /* Do not change the buffered stream for an implicit redirection
+ of /dev/null to fd 0 for asynchronous commands without job
+ control (r_inputa_direction). */
+ if (ri == r_input_direction || ri == r_input_output)
+ duplicate_buffered_stream (fd, redirector);
+#endif /* BUFFERED_INPUT */
+
+ /*
+ * If we're remembering, then this is the result of a while, for
+ * or until loop with a loop redirection, or a function/builtin
+ * executing in the parent shell with a redirection. In the
+ * function/builtin case, we want to set all file descriptors > 2
+ * to be close-on-exec to duplicate the effect of the old
+ * for i = 3 to NOFILE close(i) loop. In the case of the loops,
+ * both sh and ksh leave the file descriptors open across execs.
+ * The Posix standard mentions only the exec builtin.
+ */
+ if ((flags & RX_CLEXEC) && (redirector > 2))
+ SET_CLOSE_ON_EXEC (redirector);
+ }
+
+ if (fd != redirector)
+ {
+#if defined (BUFFERED_INPUT)
+ if (INPUT_REDIRECT (ri))
+ close_buffered_fd (fd);
+ else
+#endif /* !BUFFERED_INPUT */
+ close (fd); /* Don't close what we just opened! */
+ }
+
+ /* If we are hacking both stdout and stderr, do the stderr
+ redirection here. XXX - handle {var} here? */
+ if (ri == r_err_and_out || ri == r_append_err_and_out)
+ {
+ if (flags & RX_ACTIVE)
+ {
+ if (flags & RX_UNDOABLE)
+ add_undo_redirect (2, ri, -1);
+ if (dup2 (1, 2) < 0)
+ return (errno);
+ }
+ }
+ break;
+
+ case r_reading_until:
+ case r_deblank_reading_until:
+ case r_reading_string:
+ /* REDIRECTEE is a pointer to a WORD_DESC containing the text of
+ the new input. Place it in a temporary file. */
+ if (redirectee)
+ {
+ fd = here_document_to_fd (redirectee, ri);
+
+ if (fd < 0)
+ {
+ heredoc_errno = errno;
+ return (HEREDOC_REDIRECT);
+ }
+
+ if (redirect->rflags & REDIR_VARASSIGN)
+ redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */
+
+ if (flags & RX_ACTIVE)
+ {
+ if (flags & RX_UNDOABLE)
+ {
+ /* Only setup to undo it if the thing to undo is active. */
+ if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1))
+ add_undo_redirect (redirector, ri, -1);
+ else
+ add_undo_close_redirect (redirector);
+ }
+
+#if defined (BUFFERED_INPUT)
+ check_bash_input (redirector);
+#endif
+ if (redirect->rflags & REDIR_VARASSIGN)
+ {
+ if ((r = redir_varassign (redirect, redirector)) < 0)
+ {
+ close (redirector);
+ close (fd);
+ return (r); /* XXX */
+ }
+ }
+ else if (fd != redirector && dup2 (fd, redirector) < 0)
+ {
+ r = errno;
+ close (fd);
+ return (r);
+ }
+
+#if defined (BUFFERED_INPUT)
+ duplicate_buffered_stream (fd, redirector);
+#endif
+
+ if ((flags & RX_CLEXEC) && (redirector > 2))
+ SET_CLOSE_ON_EXEC (redirector);
+ }
+
+ if (fd != redirector)
+#if defined (BUFFERED_INPUT)
+ close_buffered_fd (fd);
+#else
+ close (fd);
+#endif
+ }
+ break;
+
+ case r_duplicating_input:
+ case r_duplicating_output:
+ case r_move_input:
+ case r_move_output:
+ if ((flags & RX_ACTIVE) && (redirect->rflags & REDIR_VARASSIGN))
+ redirector = fcntl (redir_fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */
+
+ if ((flags & RX_ACTIVE) && (redir_fd != redirector))
+ {
+ if (flags & RX_UNDOABLE)
+ {
+ /* Only setup to undo it if the thing to undo is active. */
+ if (fcntl (redirector, F_GETFD, 0) != -1)
+ add_undo_redirect (redirector, ri, redir_fd);
+ else
+ add_undo_close_redirect (redirector);
+ }
+#if defined (BUFFERED_INPUT)
+ check_bash_input (redirector);
+#endif
+ if (redirect->rflags & REDIR_VARASSIGN)
+ {
+ if ((r = redir_varassign (redirect, redirector)) < 0)
+ {
+ close (redirector);
+ return (r); /* XXX */
+ }
+ }
+ /* This is correct. 2>&1 means dup2 (1, 2); */
+ else if (dup2 (redir_fd, redirector) < 0)
+ return (errno);
+
+#if defined (BUFFERED_INPUT)
+ if (ri == r_duplicating_input || ri == r_move_input)
+ duplicate_buffered_stream (redir_fd, redirector);
+#endif /* BUFFERED_INPUT */
+
+ /* First duplicate the close-on-exec state of redirectee. dup2
+ leaves the flag unset on the new descriptor, which means it
+ stays open. Only set the close-on-exec bit for file descriptors
+ greater than 2 in any case, since 0-2 should always be open
+ unless closed by something like `exec 2<&-'. It should always
+ be safe to set fds > 2 to close-on-exec if they're being used to
+ save file descriptors < 2, since we don't need to preserve the
+ state of the close-on-exec flag for those fds -- they should
+ always be open. */
+ /* if ((already_set || set_unconditionally) && (ok_to_set))
+ set_it () */
+#if 0
+ if (((fcntl (redir_fd, F_GETFD, 0) == 1) || redir_fd < 2 || (flags & RX_CLEXEC)) &&
+ (redirector > 2))
+#else
+ if (((fcntl (redir_fd, F_GETFD, 0) == 1) || (redir_fd < 2 && (flags & RX_INTERNAL)) || (flags & RX_CLEXEC)) &&
+ (redirector > 2))
+#endif
+ SET_CLOSE_ON_EXEC (redirector);
+
+ /* When undoing saving of non-standard file descriptors (>=3) using
+ file descriptors >= SHELL_FD_BASE, we set the saving fd to be
+ close-on-exec and use a flag to decide how to set close-on-exec
+ when the fd is restored. */
+ if ((redirect->flags & RX_INTERNAL) && (redirect->flags & RX_SAVCLEXEC) && redirector >= 3 && redir_fd >= SHELL_FD_BASE)
+ SET_OPEN_ON_EXEC (redirector);
+
+ /* dup-and-close redirection */
+ if (ri == r_move_input || ri == r_move_output)
+ {
+ xtrace_fdchk (redir_fd);
+
+ close (redir_fd);
+#if defined (COPROCESS_SUPPORT)
+ coproc_fdchk (redir_fd); /* XXX - loses coproc fds */
+#endif
+ }
+ }
+ break;
+
+ case r_close_this:
+ if (flags & RX_ACTIVE)
+ {
+ if (redirect->rflags & REDIR_VARASSIGN)
+ {
+ redirector = redir_varvalue (redirect);
+ if (redirector < 0)
+ return AMBIGUOUS_REDIRECT;
+ }
+
+ if ((flags & RX_UNDOABLE) && (fcntl (redirector, F_GETFD, 0) != -1))
+ add_undo_redirect (redirector, ri, -1);
+
+#if defined (COPROCESS_SUPPORT)
+ coproc_fdchk (redirector);
+#endif
+ xtrace_fdchk (redirector);
+
+#if defined (BUFFERED_INPUT)
+ check_bash_input (redirector);
+ close_buffered_fd (redirector);
+#else /* !BUFFERED_INPUT */
+ close (redirector);
+#endif /* !BUFFERED_INPUT */
+ }
+ break;
+
+ case r_duplicating_input_word:
+ case r_duplicating_output_word:
+ break;
+ }
+ return (0);
+}
+
+/* Remember the file descriptor associated with the slot FD,
+ on REDIRECTION_UNDO_LIST. Note that the list will be reversed
+ before it is executed. Any redirections that need to be undone
+ even if REDIRECTION_UNDO_LIST is discarded by the exec builtin
+ are also saved on EXEC_REDIRECTION_UNDO_LIST. FDBASE says where to
+ start the duplicating. If it's less than SHELL_FD_BASE, we're ok,
+ and can use SHELL_FD_BASE (-1 == don't care). If it's >= SHELL_FD_BASE,
+ we have to make sure we don't use fdbase to save a file descriptor,
+ since we're going to use it later (e.g., make sure we don't save fd 0
+ to fd 10 if we have a redirection like 0<&10). If the value of fdbase
+ puts the process over its fd limit, causing fcntl to fail, we try
+ again with SHELL_FD_BASE. */
+static int
+add_undo_redirect (fd, ri, fdbase)
+ int fd;
+ enum r_instruction ri;
+ int fdbase;
+{
+ int new_fd, clexec_flag;
+ REDIRECT *new_redirect, *closer, *dummy_redirect;
+ REDIRECTEE sd;
+
+ new_fd = fcntl (fd, F_DUPFD, (fdbase < SHELL_FD_BASE) ? SHELL_FD_BASE : fdbase+1);
+ if (new_fd < 0)
+ new_fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE);
+
+ if (new_fd < 0)
+ {
+ sys_error (_("redirection error: cannot duplicate fd"));
+ return (-1);
+ }
+
+ clexec_flag = fcntl (fd, F_GETFD, 0);
+
+ sd.dest = new_fd;
+ rd.dest = 0;
+ closer = make_redirection (sd, r_close_this, rd, 0);
+ closer->flags |= RX_INTERNAL;
+ dummy_redirect = copy_redirects (closer);
+
+ sd.dest = fd;
+ rd.dest = new_fd;
+ if (fd == 0)
+ new_redirect = make_redirection (sd, r_duplicating_input, rd, 0);
+ else
+ new_redirect = make_redirection (sd, r_duplicating_output, rd, 0);
+ new_redirect->flags |= RX_INTERNAL;
+ if (clexec_flag == 0 && fd >= 3 && new_fd >= SHELL_FD_BASE)
+ new_redirect->flags |= RX_SAVCLEXEC;
+ new_redirect->next = closer;
+
+ closer->next = redirection_undo_list;
+ redirection_undo_list = new_redirect;
+
+ /* Save redirections that need to be undone even if the undo list
+ is thrown away by the `exec' builtin. */
+ add_exec_redirect (dummy_redirect);
+
+ /* experimental: if we're saving a redirection to undo for a file descriptor
+ above SHELL_FD_BASE, add a redirection to be undone if the exec builtin
+ causes redirections to be discarded. There needs to be a difference
+ between fds that are used to save other fds and then are the target of
+ user redirctions and fds that are just the target of user redirections.
+ We use the close-on-exec flag to tell the difference; fds > SHELL_FD_BASE
+ that have the close-on-exec flag set are assumed to be fds used internally
+ to save others. */
+ if (fd >= SHELL_FD_BASE && ri != r_close_this && clexec_flag)
+ {
+ sd.dest = fd;
+ rd.dest = new_fd;
+ new_redirect = make_redirection (sd, r_duplicating_output, rd, 0);
+ new_redirect->flags |= RX_INTERNAL;
+
+ add_exec_redirect (new_redirect);
+ }
+
+ /* File descriptors used only for saving others should always be
+ marked close-on-exec. Unfortunately, we have to preserve the
+ close-on-exec state of the file descriptor we are saving, since
+ fcntl (F_DUPFD) sets the new file descriptor to remain open
+ across execs. If, however, the file descriptor whose state we
+ are saving is <= 2, we can just set the close-on-exec flag,
+ because file descriptors 0-2 should always be open-on-exec,
+ and the restore above in do_redirection() will take care of it. */
+ if (clexec_flag || fd < 3)
+ SET_CLOSE_ON_EXEC (new_fd);
+ else if (redirection_undo_list->flags & RX_SAVCLEXEC)
+ SET_CLOSE_ON_EXEC (new_fd);
+
+ return (0);
+}
+
+/* Set up to close FD when we are finished with the current command
+ and its redirections. */
+static void
+add_undo_close_redirect (fd)
+ int fd;
+{
+ REDIRECT *closer;
+ REDIRECTEE sd;
+
+ sd.dest = fd;
+ rd.dest = 0;
+ closer = make_redirection (sd, r_close_this, rd, 0);
+ closer->flags |= RX_INTERNAL;
+ closer->next = redirection_undo_list;
+ redirection_undo_list = closer;
+}
+
+static void
+add_exec_redirect (dummy_redirect)
+ REDIRECT *dummy_redirect;
+{
+ dummy_redirect->next = exec_redirection_undo_list;
+ exec_redirection_undo_list = dummy_redirect;
+}
+
+/* Return 1 if the redirection specified by RI and REDIRECTOR alters the
+ standard input. */
+static int
+stdin_redirection (ri, redirector)
+ enum r_instruction ri;
+ int redirector;
+{
+ switch (ri)
+ {
+ case r_input_direction:
+ case r_inputa_direction:
+ case r_input_output:
+ case r_reading_until:
+ case r_deblank_reading_until:
+ case r_reading_string:
+ return (1);
+ case r_duplicating_input:
+ case r_duplicating_input_word:
+ case r_close_this:
+ return (redirector == 0);
+ case r_output_direction:
+ case r_appending_to:
+ case r_duplicating_output:
+ case r_err_and_out:
+ case r_append_err_and_out:
+ case r_output_force:
+ case r_duplicating_output_word:
+ return (0);
+ }
+ return (0);
+}
+
+/* Return non-zero if any of the redirections in REDIRS alter the standard
+ input. */
+int
+stdin_redirects (redirs)
+ REDIRECT *redirs;
+{
+ REDIRECT *rp;
+ int n;
+
+ for (n = 0, rp = redirs; rp; rp = rp->next)
+ if ((rp->rflags & REDIR_VARASSIGN) == 0)
+ n += stdin_redirection (rp->instruction, rp->redirector.dest);
+ return n;
+}
+
+/* These don't yet handle array references */
+static int
+redir_varassign (redir, fd)
+ REDIRECT *redir;
+ int fd;
+{
+ WORD_DESC *w;
+ SHELL_VAR *v;
+
+ w = redir->redirector.filename;
+ v = bind_var_to_int (w->word, fd);
+ if (v == 0 || readonly_p (v) || noassign_p (v))
+ return BADVAR_REDIRECT;
+
+ return 0;
+}
+
+static int
+redir_varvalue (redir)
+ REDIRECT *redir;
+{
+ SHELL_VAR *v;
+ char *val;
+ intmax_t vmax;
+ int i;
+
+ /* XXX - handle set -u here? */
+ v = find_variable (redir->redirector.filename->word);
+ if (v == 0 || invisible_p (v))
+ return -1;
+
+ val = get_variable_value (v);
+ if (val == 0 || *val == 0)
+ return -1;
+
+ if (legal_number (val, &vmax) < 0)
+ return -1;
+
+ i = vmax; /* integer truncation */
+ return i;
+}
projects / thirdparty / bash.git / commitdiff
