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1 | /* shell.c -- GNU's idea of the POSIX shell specification. */ |
2 | ||
3 | /* Copyright (C) 1987-2012 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
7 | Bash is free software: you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | Bash is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | /* | |
22 | Birthdate: | |
23 | Sunday, January 10th, 1988. | |
24 | Initial author: Brian Fox | |
25 | */ | |
26 | #define INSTALL_DEBUG_MODE | |
27 | ||
28 | #include "config.h" | |
29 | ||
30 | #include "bashtypes.h" | |
31 | #if !defined (_MINIX) && defined (HAVE_SYS_FILE_H) | |
32 | # include <sys/file.h> | |
33 | #endif | |
34 | #include "posixstat.h" | |
35 | #include "posixtime.h" | |
36 | #include "bashansi.h" | |
37 | #include <stdio.h> | |
38 | #include <signal.h> | |
39 | #include <errno.h> | |
40 | #include "filecntl.h" | |
41 | #include <pwd.h> | |
42 | ||
43 | #if defined (HAVE_UNISTD_H) | |
44 | # include <unistd.h> | |
45 | #endif | |
46 | ||
47 | #include "bashintl.h" | |
48 | ||
49 | #define NEED_SH_SETLINEBUF_DECL /* used in externs.h */ | |
50 | ||
51 | #include "shell.h" | |
52 | #include "flags.h" | |
53 | #include "trap.h" | |
54 | #include "mailcheck.h" | |
55 | #include "builtins.h" | |
56 | #include "builtins/common.h" | |
57 | ||
58 | #if defined (JOB_CONTROL) | |
59 | #include "jobs.h" | |
60 | #endif /* JOB_CONTROL */ | |
61 | ||
62 | #include "input.h" | |
63 | #include "execute_cmd.h" | |
64 | #include "findcmd.h" | |
65 | ||
66 | #if defined (USING_BASH_MALLOC) && defined (DEBUG) && !defined (DISABLE_MALLOC_WRAPPERS) | |
67 | # include <malloc/shmalloc.h> | |
68 | #endif | |
69 | ||
70 | #if defined (HISTORY) | |
71 | # include "bashhist.h" | |
72 | # include <readline/history.h> | |
73 | #endif | |
74 | ||
75 | #if defined (READLINE) | |
76 | # include <readline/readline.h> | |
77 | # include "bashline.h" | |
78 | #endif | |
79 | ||
80 | #include <tilde/tilde.h> | |
81 | #include <glob/strmatch.h> | |
82 | ||
83 | #if defined (__OPENNT) | |
84 | # include <opennt/opennt.h> | |
85 | #endif | |
86 | ||
87 | #if !defined (HAVE_GETPW_DECLS) | |
88 | extern struct passwd *getpwuid (); | |
89 | #endif /* !HAVE_GETPW_DECLS */ | |
90 | ||
91 | #if !defined (errno) | |
92 | extern int errno; | |
93 | #endif | |
94 | ||
95 | #if defined (NO_MAIN_ENV_ARG) | |
96 | extern char **environ; /* used if no third argument to main() */ | |
97 | #endif | |
98 | ||
99 | extern char *dist_version, *release_status; | |
100 | extern int patch_level, build_version; | |
101 | extern int shell_level; | |
102 | extern int subshell_environment; | |
103 | extern int running_in_background; | |
104 | extern int last_command_exit_value; | |
105 | extern int line_number; | |
106 | extern int expand_aliases; | |
107 | extern int array_needs_making; | |
108 | extern int gnu_error_format; | |
109 | extern char *primary_prompt, *secondary_prompt; | |
110 | extern char *this_command_name; | |
111 | ||
112 | /* Non-zero means that this shell has already been run; i.e. you should | |
113 | call shell_reinitialize () if you need to start afresh. */ | |
114 | int shell_initialized = 0; | |
115 | ||
116 | COMMAND *global_command = (COMMAND *)NULL; | |
117 | ||
118 | /* Information about the current user. */ | |
119 | struct user_info current_user = | |
120 | { | |
121 | (uid_t)-1, (uid_t)-1, (gid_t)-1, (gid_t)-1, | |
122 | (char *)NULL, (char *)NULL, (char *)NULL | |
123 | }; | |
124 | ||
125 | /* The current host's name. */ | |
126 | char *current_host_name = (char *)NULL; | |
127 | ||
128 | /* Non-zero means that this shell is a login shell. | |
129 | Specifically: | |
130 | 0 = not login shell. | |
131 | 1 = login shell from getty (or equivalent fake out) | |
132 | -1 = login shell from "--login" (or -l) flag. | |
133 | -2 = both from getty, and from flag. | |
134 | */ | |
135 | int login_shell = 0; | |
136 | ||
137 | /* Non-zero means that at this moment, the shell is interactive. In | |
138 | general, this means that the shell is at this moment reading input | |
139 | from the keyboard. */ | |
140 | int interactive = 0; | |
141 | ||
142 | /* Non-zero means that the shell was started as an interactive shell. */ | |
143 | int interactive_shell = 0; | |
144 | ||
145 | /* Non-zero means to send a SIGHUP to all jobs when an interactive login | |
146 | shell exits. */ | |
147 | int hup_on_exit = 0; | |
148 | ||
149 | /* Non-zero means to list status of running and stopped jobs at shell exit */ | |
150 | int check_jobs_at_exit = 0; | |
151 | ||
152 | /* Non-zero means to change to a directory name supplied as a command name */ | |
153 | int autocd = 0; | |
154 | ||
155 | /* Tells what state the shell was in when it started: | |
156 | 0 = non-interactive shell script | |
157 | 1 = interactive | |
158 | 2 = -c command | |
159 | 3 = wordexp evaluation | |
160 | This is a superset of the information provided by interactive_shell. | |
161 | */ | |
162 | int startup_state = 0; | |
163 | ||
164 | /* Special debugging helper. */ | |
165 | int debugging_login_shell = 0; | |
166 | ||
167 | /* The environment that the shell passes to other commands. */ | |
168 | char **shell_environment; | |
169 | ||
170 | /* Non-zero when we are executing a top-level command. */ | |
171 | int executing = 0; | |
172 | ||
173 | /* The number of commands executed so far. */ | |
174 | int current_command_number = 1; | |
175 | ||
176 | /* Non-zero is the recursion depth for commands. */ | |
177 | int indirection_level = 0; | |
178 | ||
179 | /* The name of this shell, as taken from argv[0]. */ | |
180 | char *shell_name = (char *)NULL; | |
181 | ||
182 | /* time in seconds when the shell was started */ | |
183 | time_t shell_start_time; | |
184 | ||
185 | /* Are we running in an emacs shell window? */ | |
186 | int running_under_emacs; | |
187 | ||
188 | /* Do we have /dev/fd? */ | |
189 | #ifdef HAVE_DEV_FD | |
190 | int have_devfd = HAVE_DEV_FD; | |
191 | #else | |
192 | int have_devfd = 0; | |
193 | #endif | |
194 | ||
195 | /* The name of the .(shell)rc file. */ | |
196 | static char *bashrc_file = DEFAULT_BASHRC; | |
197 | ||
198 | /* Non-zero means to act more like the Bourne shell on startup. */ | |
199 | static int act_like_sh; | |
200 | ||
201 | /* Non-zero if this shell is being run by `su'. */ | |
202 | static int su_shell; | |
203 | ||
204 | /* Non-zero if we have already expanded and sourced $ENV. */ | |
205 | static int sourced_env; | |
206 | ||
207 | /* Is this shell running setuid? */ | |
208 | static int running_setuid; | |
209 | ||
210 | /* Values for the long-winded argument names. */ | |
211 | static int debugging; /* Do debugging things. */ | |
212 | static int no_rc; /* Don't execute ~/.bashrc */ | |
213 | static int no_profile; /* Don't execute .profile */ | |
214 | static int do_version; /* Display interesting version info. */ | |
215 | static int make_login_shell; /* Make this shell be a `-bash' shell. */ | |
216 | static int want_initial_help; /* --help option */ | |
217 | ||
218 | int debugging_mode = 0; /* In debugging mode with --debugger */ | |
219 | #if defined (READLINE) | |
220 | int no_line_editing = 0; /* non-zero -> don't do fancy line editing. */ | |
221 | #else | |
222 | int no_line_editing = 1; /* can't have line editing without readline */ | |
223 | #endif | |
224 | int dump_translatable_strings; /* Dump strings in $"...", don't execute. */ | |
225 | int dump_po_strings; /* Dump strings in $"..." in po format */ | |
226 | int wordexp_only = 0; /* Do word expansion only */ | |
227 | int protected_mode = 0; /* No command substitution with --wordexp */ | |
228 | ||
229 | #if defined (STRICT_POSIX) | |
230 | int posixly_correct = 1; /* Non-zero means posix.2 superset. */ | |
231 | #else | |
232 | int posixly_correct = 0; /* Non-zero means posix.2 superset. */ | |
233 | #endif | |
234 | ||
235 | /* Some long-winded argument names. These are obviously new. */ | |
236 | #define Int 1 | |
237 | #define Charp 2 | |
238 | static const struct { | |
239 | const char *name; | |
240 | int type; | |
241 | int *int_value; | |
242 | char **char_value; | |
243 | } long_args[] = { | |
244 | { "debug", Int, &debugging, (char **)0x0 }, | |
245 | #if defined (DEBUGGER) | |
246 | { "debugger", Int, &debugging_mode, (char **)0x0 }, | |
247 | #endif | |
248 | { "dump-po-strings", Int, &dump_po_strings, (char **)0x0 }, | |
249 | { "dump-strings", Int, &dump_translatable_strings, (char **)0x0 }, | |
250 | { "help", Int, &want_initial_help, (char **)0x0 }, | |
251 | { "init-file", Charp, (int *)0x0, &bashrc_file }, | |
252 | { "login", Int, &make_login_shell, (char **)0x0 }, | |
253 | { "noediting", Int, &no_line_editing, (char **)0x0 }, | |
254 | { "noprofile", Int, &no_profile, (char **)0x0 }, | |
255 | { "norc", Int, &no_rc, (char **)0x0 }, | |
256 | { "posix", Int, &posixly_correct, (char **)0x0 }, | |
257 | #if defined (WORDEXP_OPTION) | |
258 | { "protected", Int, &protected_mode, (char **)0x0 }, | |
259 | #endif | |
260 | { "rcfile", Charp, (int *)0x0, &bashrc_file }, | |
261 | #if defined (RESTRICTED_SHELL) | |
262 | { "restricted", Int, &restricted, (char **)0x0 }, | |
263 | #endif | |
264 | { "verbose", Int, &echo_input_at_read, (char **)0x0 }, | |
265 | { "version", Int, &do_version, (char **)0x0 }, | |
266 | #if defined (WORDEXP_OPTION) | |
267 | { "wordexp", Int, &wordexp_only, (char **)0x0 }, | |
268 | #endif | |
269 | { (char *)0x0, Int, (int *)0x0, (char **)0x0 } | |
270 | }; | |
271 | ||
272 | /* These are extern so execute_simple_command can set them, and then | |
273 | longjmp back to main to execute a shell script, instead of calling | |
274 | main () again and resulting in indefinite, possibly fatal, stack | |
275 | growth. */ | |
276 | procenv_t subshell_top_level; | |
277 | int subshell_argc; | |
278 | char **subshell_argv; | |
279 | char **subshell_envp; | |
280 | ||
281 | char *exec_argv0; | |
282 | ||
283 | #if defined (BUFFERED_INPUT) | |
284 | /* The file descriptor from which the shell is reading input. */ | |
285 | int default_buffered_input = -1; | |
286 | #endif | |
287 | ||
288 | /* The following two variables are not static so they can show up in $-. */ | |
289 | int read_from_stdin; /* -s flag supplied */ | |
290 | int want_pending_command; /* -c flag supplied */ | |
291 | ||
292 | /* This variable is not static so it can be bound to $BASH_EXECUTION_STRING */ | |
293 | char *command_execution_string; /* argument to -c option */ | |
294 | ||
295 | int malloc_trace_at_exit = 0; | |
296 | ||
297 | static int shell_reinitialized = 0; | |
298 | ||
299 | static FILE *default_input; | |
300 | ||
301 | static STRING_INT_ALIST *shopt_alist; | |
302 | static int shopt_ind = 0, shopt_len = 0; | |
303 | ||
304 | static int parse_long_options __P((char **, int, int)); | |
305 | static int parse_shell_options __P((char **, int, int)); | |
306 | static int bind_args __P((char **, int, int, int)); | |
307 | ||
308 | static void start_debugger __P((void)); | |
309 | ||
310 | static void add_shopt_to_alist __P((char *, int)); | |
311 | static void run_shopt_alist __P((void)); | |
312 | ||
313 | static void execute_env_file __P((char *)); | |
314 | static void run_startup_files __P((void)); | |
315 | static int open_shell_script __P((char *)); | |
316 | static void set_bash_input __P((void)); | |
317 | static int run_one_command __P((char *)); | |
318 | #if defined (WORDEXP_OPTION) | |
319 | static int run_wordexp __P((char *)); | |
320 | #endif | |
321 | ||
322 | static int uidget __P((void)); | |
323 | ||
324 | static void init_interactive __P((void)); | |
325 | static void init_noninteractive __P((void)); | |
326 | static void init_interactive_script __P((void)); | |
327 | ||
328 | static void set_shell_name __P((char *)); | |
329 | static void shell_initialize __P((void)); | |
330 | static void shell_reinitialize __P((void)); | |
331 | ||
332 | static void show_shell_usage __P((FILE *, int)); | |
333 | ||
334 | #ifdef __CYGWIN__ | |
335 | static void | |
336 | _cygwin32_check_tmp () | |
337 | { | |
338 | struct stat sb; | |
339 | ||
340 | if (stat ("/tmp", &sb) < 0) | |
341 | internal_warning (_("could not find /tmp, please create!")); | |
342 | else | |
343 | { | |
344 | if (S_ISDIR (sb.st_mode) == 0) | |
345 | internal_warning (_("/tmp must be a valid directory name")); | |
346 | } | |
347 | } | |
348 | #endif /* __CYGWIN__ */ | |
349 | ||
350 | #if defined (NO_MAIN_ENV_ARG) | |
351 | /* systems without third argument to main() */ | |
352 | int | |
353 | main (argc, argv) | |
354 | int argc; | |
355 | char **argv; | |
356 | #else /* !NO_MAIN_ENV_ARG */ | |
357 | int | |
358 | main (argc, argv, env) | |
359 | int argc; | |
360 | char **argv, **env; | |
361 | #endif /* !NO_MAIN_ENV_ARG */ | |
362 | { | |
363 | register int i; | |
364 | int code, old_errexit_flag; | |
365 | #if defined (RESTRICTED_SHELL) | |
366 | int saverst; | |
367 | #endif | |
368 | volatile int locally_skip_execution; | |
369 | volatile int arg_index, top_level_arg_index; | |
370 | #ifdef __OPENNT | |
371 | char **env; | |
372 | ||
373 | env = environ; | |
374 | #endif /* __OPENNT */ | |
375 | ||
376 | USE_VAR(argc); | |
377 | USE_VAR(argv); | |
378 | USE_VAR(env); | |
379 | USE_VAR(code); | |
380 | USE_VAR(old_errexit_flag); | |
381 | #if defined (RESTRICTED_SHELL) | |
382 | USE_VAR(saverst); | |
383 | #endif | |
384 | ||
385 | /* Catch early SIGINTs. */ | |
386 | code = setjmp_nosigs (top_level); | |
387 | if (code) | |
388 | exit (2); | |
389 | ||
390 | xtrace_init (); | |
391 | ||
392 | #if defined (USING_BASH_MALLOC) && defined (DEBUG) && !defined (DISABLE_MALLOC_WRAPPERS) | |
393 | # if 1 | |
394 | malloc_set_register (1); | |
395 | # endif | |
396 | #endif | |
397 | ||
398 | check_dev_tty (); | |
399 | ||
400 | #ifdef __CYGWIN__ | |
401 | _cygwin32_check_tmp (); | |
402 | #endif /* __CYGWIN__ */ | |
403 | ||
404 | /* Wait forever if we are debugging a login shell. */ | |
405 | while (debugging_login_shell) sleep (3); | |
406 | ||
407 | set_default_locale (); | |
408 | ||
409 | running_setuid = uidget (); | |
410 | ||
411 | if (getenv ("POSIXLY_CORRECT") || getenv ("POSIX_PEDANTIC")) | |
412 | posixly_correct = 1; | |
413 | ||
414 | #if defined (USE_GNU_MALLOC_LIBRARY) | |
415 | mcheck (programming_error, (void (*) ())0); | |
416 | #endif /* USE_GNU_MALLOC_LIBRARY */ | |
417 | ||
418 | if (setjmp (subshell_top_level)) | |
419 | { | |
420 | argc = subshell_argc; | |
421 | argv = subshell_argv; | |
422 | env = subshell_envp; | |
423 | sourced_env = 0; | |
424 | } | |
425 | ||
426 | shell_reinitialized = 0; | |
427 | ||
428 | /* Initialize `local' variables for all `invocations' of main (). */ | |
429 | arg_index = 1; | |
430 | if (arg_index > argc) | |
431 | arg_index = argc; | |
432 | command_execution_string = (char *)NULL; | |
433 | want_pending_command = locally_skip_execution = read_from_stdin = 0; | |
434 | default_input = stdin; | |
435 | #if defined (BUFFERED_INPUT) | |
436 | default_buffered_input = -1; | |
437 | #endif | |
438 | ||
439 | /* Fix for the `infinite process creation' bug when running shell scripts | |
440 | from startup files on System V. */ | |
441 | login_shell = make_login_shell = 0; | |
442 | ||
443 | /* If this shell has already been run, then reinitialize it to a | |
444 | vanilla state. */ | |
445 | if (shell_initialized || shell_name) | |
446 | { | |
447 | /* Make sure that we do not infinitely recurse as a login shell. */ | |
448 | if (*shell_name == '-') | |
449 | shell_name++; | |
450 | ||
451 | shell_reinitialize (); | |
452 | if (setjmp_nosigs (top_level)) | |
453 | exit (2); | |
454 | } | |
455 | ||
456 | shell_environment = env; | |
457 | set_shell_name (argv[0]); | |
458 | shell_start_time = NOW; /* NOW now defined in general.h */ | |
459 | ||
460 | /* Parse argument flags from the input line. */ | |
461 | ||
462 | /* Find full word arguments first. */ | |
463 | arg_index = parse_long_options (argv, arg_index, argc); | |
464 | ||
465 | if (want_initial_help) | |
466 | { | |
467 | show_shell_usage (stdout, 1); | |
468 | exit (EXECUTION_SUCCESS); | |
469 | } | |
470 | ||
471 | if (do_version) | |
472 | { | |
473 | show_shell_version (1); | |
474 | exit (EXECUTION_SUCCESS); | |
475 | } | |
476 | ||
477 | /* All done with full word options; do standard shell option parsing.*/ | |
478 | this_command_name = shell_name; /* for error reporting */ | |
479 | arg_index = parse_shell_options (argv, arg_index, argc); | |
480 | ||
481 | /* If user supplied the "--login" (or -l) flag, then set and invert | |
482 | LOGIN_SHELL. */ | |
483 | if (make_login_shell) | |
484 | { | |
485 | login_shell++; | |
486 | login_shell = -login_shell; | |
487 | } | |
488 | ||
489 | set_login_shell ("login_shell", login_shell != 0); | |
490 | ||
491 | if (dump_po_strings) | |
492 | dump_translatable_strings = 1; | |
493 | ||
494 | if (dump_translatable_strings) | |
495 | read_but_dont_execute = 1; | |
496 | ||
497 | if (running_setuid && privileged_mode == 0) | |
498 | disable_priv_mode (); | |
499 | ||
500 | /* Need to get the argument to a -c option processed in the | |
501 | above loop. The next arg is a command to execute, and the | |
502 | following args are $0...$n respectively. */ | |
503 | if (want_pending_command) | |
504 | { | |
505 | command_execution_string = argv[arg_index]; | |
506 | if (command_execution_string == 0) | |
507 | { | |
508 | report_error (_("%s: option requires an argument"), "-c"); | |
509 | exit (EX_BADUSAGE); | |
510 | } | |
511 | arg_index++; | |
512 | } | |
513 | this_command_name = (char *)NULL; | |
514 | ||
515 | cmd_init(); /* initialize the command object caches */ | |
516 | ||
517 | /* First, let the outside world know about our interactive status. | |
518 | A shell is interactive if the `-i' flag was given, or if all of | |
519 | the following conditions are met: | |
520 | no -c command | |
521 | no arguments remaining or the -s flag given | |
522 | standard input is a terminal | |
523 | standard error is a terminal | |
524 | Refer to Posix.2, the description of the `sh' utility. */ | |
525 | ||
526 | if (forced_interactive || /* -i flag */ | |
527 | (!command_execution_string && /* No -c command and ... */ | |
528 | wordexp_only == 0 && /* No --wordexp and ... */ | |
529 | ((arg_index == argc) || /* no remaining args or... */ | |
530 | read_from_stdin) && /* -s flag with args, and */ | |
531 | isatty (fileno (stdin)) && /* Input is a terminal and */ | |
532 | isatty (fileno (stderr)))) /* error output is a terminal. */ | |
533 | init_interactive (); | |
534 | else | |
535 | init_noninteractive (); | |
536 | ||
537 | /* | |
538 | * Some systems have the bad habit of starting login shells with lots of open | |
539 | * file descriptors. For instance, most systems that have picked up the | |
540 | * pre-4.0 Sun YP code leave a file descriptor open each time you call one | |
541 | * of the getpw* functions, and it's set to be open across execs. That | |
542 | * means one for login, one for xterm, one for shelltool, etc. There are | |
543 | * also systems that open persistent FDs to other agents or files as part | |
544 | * of process startup; these need to be set to be close-on-exec. | |
545 | */ | |
546 | if (login_shell && interactive_shell) | |
547 | { | |
548 | for (i = 3; i < 20; i++) | |
549 | SET_CLOSE_ON_EXEC (i); | |
550 | } | |
551 | ||
552 | /* If we're in a strict Posix.2 mode, turn on interactive comments, | |
553 | alias expansion in non-interactive shells, and other Posix.2 things. */ | |
554 | if (posixly_correct) | |
555 | { | |
556 | bind_variable ("POSIXLY_CORRECT", "y", 0); | |
557 | sv_strict_posix ("POSIXLY_CORRECT"); | |
558 | } | |
559 | ||
560 | /* Now we run the shopt_alist and process the options. */ | |
561 | if (shopt_alist) | |
562 | run_shopt_alist (); | |
563 | ||
564 | /* From here on in, the shell must be a normal functioning shell. | |
565 | Variables from the environment are expected to be set, etc. */ | |
566 | shell_initialize (); | |
567 | ||
568 | set_default_lang (); | |
569 | set_default_locale_vars (); | |
570 | ||
571 | /* | |
572 | * M-x term -> TERM=eterm EMACS=22.1 (term:0.96) (eterm) | |
573 | * M-x shell -> TERM=dumb EMACS=t (no line editing) | |
574 | * M-x terminal -> TERM=emacs-em7955 EMACS= (line editing) | |
575 | */ | |
576 | if (interactive_shell) | |
577 | { | |
578 | char *term, *emacs; | |
579 | ||
580 | term = get_string_value ("TERM"); | |
581 | emacs = get_string_value ("EMACS"); | |
582 | ||
583 | /* Not sure any emacs terminal emulator sets TERM=emacs any more */ | |
584 | no_line_editing |= term && (STREQ (term, "emacs")); | |
585 | no_line_editing |= emacs && emacs[0] == 't' && emacs[1] == '\0' && STREQ (term, "dumb"); | |
586 | ||
587 | /* running_under_emacs == 2 for `eterm' */ | |
588 | running_under_emacs = (emacs != 0) || (term && STREQN (term, "emacs", 5)); | |
589 | running_under_emacs += term && STREQN (term, "eterm", 5) && emacs && strstr (emacs, "term"); | |
590 | ||
591 | if (running_under_emacs) | |
592 | gnu_error_format = 1; | |
593 | } | |
594 | ||
595 | top_level_arg_index = arg_index; | |
596 | old_errexit_flag = exit_immediately_on_error; | |
597 | ||
598 | /* Give this shell a place to longjmp to before executing the | |
599 | startup files. This allows users to press C-c to abort the | |
600 | lengthy startup. */ | |
601 | code = setjmp (top_level); | |
602 | if (code) | |
603 | { | |
604 | if (code == EXITPROG || code == ERREXIT) | |
605 | exit_shell (last_command_exit_value); | |
606 | else | |
607 | { | |
608 | #if defined (JOB_CONTROL) | |
609 | /* Reset job control, since run_startup_files turned it off. */ | |
610 | set_job_control (interactive_shell); | |
611 | #endif | |
612 | /* Reset value of `set -e', since it's turned off before running | |
613 | the startup files. */ | |
614 | exit_immediately_on_error += old_errexit_flag; | |
615 | locally_skip_execution++; | |
616 | } | |
617 | } | |
618 | ||
619 | arg_index = top_level_arg_index; | |
620 | ||
621 | /* Execute the start-up scripts. */ | |
622 | ||
623 | if (interactive_shell == 0) | |
624 | { | |
625 | unbind_variable ("PS1"); | |
626 | unbind_variable ("PS2"); | |
627 | interactive = 0; | |
628 | #if 0 | |
629 | /* This has already been done by init_noninteractive */ | |
630 | expand_aliases = posixly_correct; | |
631 | #endif | |
632 | } | |
633 | else | |
634 | { | |
635 | change_flag ('i', FLAG_ON); | |
636 | interactive = 1; | |
637 | } | |
638 | ||
639 | #if defined (RESTRICTED_SHELL) | |
640 | /* Set restricted_shell based on whether the basename of $0 indicates that | |
641 | the shell should be restricted or if the `-r' option was supplied at | |
642 | startup. */ | |
643 | restricted_shell = shell_is_restricted (shell_name); | |
644 | ||
645 | /* If the `-r' option is supplied at invocation, make sure that the shell | |
646 | is not in restricted mode when running the startup files. */ | |
647 | saverst = restricted; | |
648 | restricted = 0; | |
649 | #endif | |
650 | ||
651 | /* The startup files are run with `set -e' temporarily disabled. */ | |
652 | if (locally_skip_execution == 0 && running_setuid == 0) | |
653 | { | |
654 | old_errexit_flag = exit_immediately_on_error; | |
655 | exit_immediately_on_error = 0; | |
656 | ||
657 | run_startup_files (); | |
658 | exit_immediately_on_error += old_errexit_flag; | |
659 | } | |
660 | ||
661 | /* If we are invoked as `sh', turn on Posix mode. */ | |
662 | if (act_like_sh) | |
663 | { | |
664 | bind_variable ("POSIXLY_CORRECT", "y", 0); | |
665 | sv_strict_posix ("POSIXLY_CORRECT"); | |
666 | } | |
667 | ||
668 | #if defined (RESTRICTED_SHELL) | |
669 | /* Turn on the restrictions after executing the startup files. This | |
670 | means that `bash -r' or `set -r' invoked from a startup file will | |
671 | turn on the restrictions after the startup files are executed. */ | |
672 | restricted = saverst || restricted; | |
673 | if (shell_reinitialized == 0) | |
674 | maybe_make_restricted (shell_name); | |
675 | #endif /* RESTRICTED_SHELL */ | |
676 | ||
677 | #if defined (WORDEXP_OPTION) | |
678 | if (wordexp_only) | |
679 | { | |
680 | startup_state = 3; | |
681 | last_command_exit_value = run_wordexp (argv[arg_index]); | |
682 | exit_shell (last_command_exit_value); | |
683 | } | |
684 | #endif | |
685 | ||
686 | if (command_execution_string) | |
687 | { | |
688 | arg_index = bind_args (argv, arg_index, argc, 0); | |
689 | startup_state = 2; | |
690 | ||
691 | if (debugging_mode) | |
692 | start_debugger (); | |
693 | ||
694 | #if defined (ONESHOT) | |
695 | executing = 1; | |
696 | run_one_command (command_execution_string); | |
697 | exit_shell (last_command_exit_value); | |
698 | #else /* ONESHOT */ | |
699 | with_input_from_string (command_execution_string, "-c"); | |
700 | goto read_and_execute; | |
701 | #endif /* !ONESHOT */ | |
702 | } | |
703 | ||
704 | /* Get possible input filename and set up default_buffered_input or | |
705 | default_input as appropriate. */ | |
706 | if (arg_index != argc && read_from_stdin == 0) | |
707 | { | |
708 | open_shell_script (argv[arg_index]); | |
709 | arg_index++; | |
710 | } | |
711 | else if (interactive == 0) | |
712 | /* In this mode, bash is reading a script from stdin, which is a | |
713 | pipe or redirected file. */ | |
714 | #if defined (BUFFERED_INPUT) | |
715 | default_buffered_input = fileno (stdin); /* == 0 */ | |
716 | #else | |
717 | setbuf (default_input, (char *)NULL); | |
718 | #endif /* !BUFFERED_INPUT */ | |
719 | ||
720 | set_bash_input (); | |
721 | ||
722 | /* Bind remaining args to $1 ... $n */ | |
723 | arg_index = bind_args (argv, arg_index, argc, 1); | |
724 | ||
725 | if (debugging_mode && locally_skip_execution == 0 && running_setuid == 0 && (dollar_vars[1] || interactive_shell == 0)) | |
726 | start_debugger (); | |
727 | ||
728 | /* Do the things that should be done only for interactive shells. */ | |
729 | if (interactive_shell) | |
730 | { | |
731 | /* Set up for checking for presence of mail. */ | |
732 | reset_mail_timer (); | |
733 | init_mail_dates (); | |
734 | ||
735 | #if defined (HISTORY) | |
736 | /* Initialize the interactive history stuff. */ | |
737 | bash_initialize_history (); | |
738 | /* Don't load the history from the history file if we've already | |
739 | saved some lines in this session (e.g., by putting `history -s xx' | |
740 | into one of the startup files). */ | |
741 | if (shell_initialized == 0 && history_lines_this_session == 0) | |
742 | load_history (); | |
743 | #endif /* HISTORY */ | |
744 | ||
745 | /* Initialize terminal state for interactive shells after the | |
746 | .bash_profile and .bashrc are interpreted. */ | |
747 | get_tty_state (); | |
748 | } | |
749 | ||
750 | #if !defined (ONESHOT) | |
751 | read_and_execute: | |
752 | #endif /* !ONESHOT */ | |
753 | ||
754 | shell_initialized = 1; | |
755 | ||
756 | /* Read commands until exit condition. */ | |
757 | reader_loop (); | |
758 | exit_shell (last_command_exit_value); | |
759 | } | |
760 | ||
761 | static int | |
762 | parse_long_options (argv, arg_start, arg_end) | |
763 | char **argv; | |
764 | int arg_start, arg_end; | |
765 | { | |
766 | int arg_index, longarg, i; | |
767 | char *arg_string; | |
768 | ||
769 | arg_index = arg_start; | |
770 | while ((arg_index != arg_end) && (arg_string = argv[arg_index]) && | |
771 | (*arg_string == '-')) | |
772 | { | |
773 | longarg = 0; | |
774 | ||
775 | /* Make --login equivalent to -login. */ | |
776 | if (arg_string[1] == '-' && arg_string[2]) | |
777 | { | |
778 | longarg = 1; | |
779 | arg_string++; | |
780 | } | |
781 | ||
782 | for (i = 0; long_args[i].name; i++) | |
783 | { | |
784 | if (STREQ (arg_string + 1, long_args[i].name)) | |
785 | { | |
786 | if (long_args[i].type == Int) | |
787 | *long_args[i].int_value = 1; | |
788 | else if (argv[++arg_index] == 0) | |
789 | { | |
790 | report_error (_("%s: option requires an argument"), long_args[i].name); | |
791 | exit (EX_BADUSAGE); | |
792 | } | |
793 | else | |
794 | *long_args[i].char_value = argv[arg_index]; | |
795 | ||
796 | break; | |
797 | } | |
798 | } | |
799 | if (long_args[i].name == 0) | |
800 | { | |
801 | if (longarg) | |
802 | { | |
803 | report_error (_("%s: invalid option"), argv[arg_index]); | |
804 | show_shell_usage (stderr, 0); | |
805 | exit (EX_BADUSAGE); | |
806 | } | |
807 | break; /* No such argument. Maybe flag arg. */ | |
808 | } | |
809 | ||
810 | arg_index++; | |
811 | } | |
812 | ||
813 | return (arg_index); | |
814 | } | |
815 | ||
816 | static int | |
817 | parse_shell_options (argv, arg_start, arg_end) | |
818 | char **argv; | |
819 | int arg_start, arg_end; | |
820 | { | |
821 | int arg_index; | |
822 | int arg_character, on_or_off, next_arg, i; | |
823 | char *o_option, *arg_string; | |
824 | ||
825 | arg_index = arg_start; | |
826 | while (arg_index != arg_end && (arg_string = argv[arg_index]) && | |
827 | (*arg_string == '-' || *arg_string == '+')) | |
828 | { | |
829 | /* There are flag arguments, so parse them. */ | |
830 | next_arg = arg_index + 1; | |
831 | ||
832 | /* A single `-' signals the end of options. From the 4.3 BSD sh. | |
833 | An option `--' means the same thing; this is the standard | |
834 | getopt(3) meaning. */ | |
835 | if (arg_string[0] == '-' && | |
836 | (arg_string[1] == '\0' || | |
837 | (arg_string[1] == '-' && arg_string[2] == '\0'))) | |
838 | return (next_arg); | |
839 | ||
840 | i = 1; | |
841 | on_or_off = arg_string[0]; | |
842 | while (arg_character = arg_string[i++]) | |
843 | { | |
844 | switch (arg_character) | |
845 | { | |
846 | case 'c': | |
847 | want_pending_command = 1; | |
848 | break; | |
849 | ||
850 | case 'l': | |
851 | make_login_shell = 1; | |
852 | break; | |
853 | ||
854 | case 's': | |
855 | read_from_stdin = 1; | |
856 | break; | |
857 | ||
858 | case 'o': | |
859 | o_option = argv[next_arg]; | |
860 | if (o_option == 0) | |
861 | { | |
862 | list_minus_o_opts (-1, (on_or_off == '-') ? 0 : 1); | |
863 | break; | |
864 | } | |
865 | if (set_minus_o_option (on_or_off, o_option) != EXECUTION_SUCCESS) | |
866 | exit (EX_BADUSAGE); | |
867 | next_arg++; | |
868 | break; | |
869 | ||
870 | case 'O': | |
871 | /* Since some of these can be overridden by the normal | |
872 | interactive/non-interactive shell initialization or | |
873 | initializing posix mode, we save the options and process | |
874 | them after initialization. */ | |
875 | o_option = argv[next_arg]; | |
876 | if (o_option == 0) | |
877 | { | |
878 | shopt_listopt (o_option, (on_or_off == '-') ? 0 : 1); | |
879 | break; | |
880 | } | |
881 | add_shopt_to_alist (o_option, on_or_off); | |
882 | next_arg++; | |
883 | break; | |
884 | ||
885 | case 'D': | |
886 | dump_translatable_strings = 1; | |
887 | break; | |
888 | ||
889 | default: | |
890 | if (change_flag (arg_character, on_or_off) == FLAG_ERROR) | |
891 | { | |
892 | report_error (_("%c%c: invalid option"), on_or_off, arg_character); | |
893 | show_shell_usage (stderr, 0); | |
894 | exit (EX_BADUSAGE); | |
895 | } | |
896 | } | |
897 | } | |
898 | /* Can't do just a simple increment anymore -- what about | |
899 | "bash -abouo emacs ignoreeof -hP"? */ | |
900 | arg_index = next_arg; | |
901 | } | |
902 | ||
903 | return (arg_index); | |
904 | } | |
905 | ||
906 | /* Exit the shell with status S. */ | |
907 | void | |
908 | exit_shell (s) | |
909 | int s; | |
910 | { | |
911 | fflush (stdout); /* XXX */ | |
912 | fflush (stderr); | |
913 | ||
914 | #if defined (READLINE) | |
915 | if (RL_ISSTATE (RL_STATE_TERMPREPPED) && rl_deprep_term_function) | |
916 | (*rl_deprep_term_function) (); | |
917 | #endif | |
918 | ||
919 | /* Do trap[0] if defined. Allow it to override the exit status | |
920 | passed to us. */ | |
921 | if (signal_is_trapped (0)) | |
922 | s = run_exit_trap (); | |
923 | ||
924 | #if defined (PROCESS_SUBSTITUTION) | |
925 | unlink_fifo_list (); | |
926 | #endif /* PROCESS_SUBSTITUTION */ | |
927 | ||
928 | #if defined (HISTORY) | |
929 | if (remember_on_history) | |
930 | maybe_save_shell_history (); | |
931 | #endif /* HISTORY */ | |
932 | ||
933 | #if defined (COPROCESS_SUPPORT) | |
934 | coproc_flush (); | |
935 | #endif | |
936 | ||
937 | #if defined (JOB_CONTROL) | |
938 | /* If the user has run `shopt -s huponexit', hangup all jobs when we exit | |
939 | an interactive login shell. ksh does this unconditionally. */ | |
940 | if (interactive_shell && login_shell && hup_on_exit) | |
941 | hangup_all_jobs (); | |
942 | ||
943 | /* If this shell is interactive, or job control is active, terminate all | |
944 | stopped jobs and restore the original terminal process group. Don't do | |
945 | this if we're in a subshell and calling exit_shell after, for example, | |
946 | a failed word expansion. We want to do this even if the shell is not | |
947 | interactive because we set the terminal's process group when job control | |
948 | is enabled regardless of the interactive status. */ | |
949 | if (subshell_environment == 0) | |
950 | end_job_control (); | |
951 | #endif /* JOB_CONTROL */ | |
952 | ||
953 | /* Always return the exit status of the last command to our parent. */ | |
954 | sh_exit (s); | |
955 | } | |
956 | ||
957 | /* A wrapper for exit that (optionally) can do other things, like malloc | |
958 | statistics tracing. */ | |
959 | void | |
960 | sh_exit (s) | |
961 | int s; | |
962 | { | |
963 | #if defined (MALLOC_DEBUG) && defined (USING_BASH_MALLOC) | |
964 | if (malloc_trace_at_exit) | |
965 | trace_malloc_stats (get_name_for_error (), (char *)NULL); | |
966 | #endif | |
967 | ||
968 | exit (s); | |
969 | } | |
970 | ||
971 | /* Exit a subshell, which includes calling the exit trap. We don't want to | |
972 | do any more cleanup, since a subshell is created as an exact copy of its | |
973 | parent. */ | |
974 | void | |
975 | subshell_exit (s) | |
976 | int s; | |
977 | { | |
978 | fflush (stdout); | |
979 | fflush (stderr); | |
980 | ||
981 | /* Do trap[0] if defined. Allow it to override the exit status | |
982 | passed to us. */ | |
983 | if (signal_is_trapped (0)) | |
984 | s = run_exit_trap (); | |
985 | ||
986 | sh_exit (s); | |
987 | } | |
988 | ||
989 | /* Source the bash startup files. If POSIXLY_CORRECT is non-zero, we obey | |
990 | the Posix.2 startup file rules: $ENV is expanded, and if the file it | |
991 | names exists, that file is sourced. The Posix.2 rules are in effect | |
992 | for interactive shells only. (section 4.56.5.3) */ | |
993 | ||
994 | /* Execute ~/.bashrc for most shells. Never execute it if | |
995 | ACT_LIKE_SH is set, or if NO_RC is set. | |
996 | ||
997 | If the executable file "/usr/gnu/src/bash/foo" contains: | |
998 | ||
999 | #!/usr/gnu/bin/bash | |
1000 | echo hello | |
1001 | ||
1002 | then: | |
1003 | ||
1004 | COMMAND EXECUTE BASHRC | |
1005 | -------------------------------- | |
1006 | bash -c foo NO | |
1007 | bash foo NO | |
1008 | foo NO | |
1009 | rsh machine ls YES (for rsh, which calls `bash -c') | |
1010 | rsh machine foo YES (for shell started by rsh) NO (for foo!) | |
1011 | echo ls | bash NO | |
1012 | login NO | |
1013 | bash YES | |
1014 | */ | |
1015 | ||
1016 | static void | |
1017 | execute_env_file (env_file) | |
1018 | char *env_file; | |
1019 | { | |
1020 | char *fn; | |
1021 | ||
1022 | if (env_file && *env_file) | |
1023 | { | |
1024 | fn = expand_string_unsplit_to_string (env_file, Q_DOUBLE_QUOTES); | |
1025 | if (fn && *fn) | |
1026 | maybe_execute_file (fn, 1); | |
1027 | FREE (fn); | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | static void | |
1032 | run_startup_files () | |
1033 | { | |
1034 | #if defined (JOB_CONTROL) | |
1035 | int old_job_control; | |
1036 | #endif | |
1037 | int sourced_login, run_by_ssh; | |
1038 | ||
1039 | /* get the rshd/sshd case out of the way first. */ | |
1040 | if (interactive_shell == 0 && no_rc == 0 && login_shell == 0 && | |
1041 | act_like_sh == 0 && command_execution_string) | |
1042 | { | |
1043 | #ifdef SSH_SOURCE_BASHRC | |
1044 | run_by_ssh = (find_variable ("SSH_CLIENT") != (SHELL_VAR *)0) || | |
1045 | (find_variable ("SSH2_CLIENT") != (SHELL_VAR *)0); | |
1046 | #else | |
1047 | run_by_ssh = 0; | |
1048 | #endif | |
1049 | ||
1050 | /* If we were run by sshd or we think we were run by rshd, execute | |
1051 | ~/.bashrc if we are a top-level shell. */ | |
1052 | if ((run_by_ssh || isnetconn (fileno (stdin))) && shell_level < 2) | |
1053 | { | |
1054 | #ifdef SYS_BASHRC | |
1055 | # if defined (__OPENNT) | |
1056 | maybe_execute_file (_prefixInstallPath(SYS_BASHRC, NULL, 0), 1); | |
1057 | # else | |
1058 | maybe_execute_file (SYS_BASHRC, 1); | |
1059 | # endif | |
1060 | #endif | |
1061 | maybe_execute_file (bashrc_file, 1); | |
1062 | return; | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | #if defined (JOB_CONTROL) | |
1067 | /* Startup files should be run without job control enabled. */ | |
1068 | old_job_control = interactive_shell ? set_job_control (0) : 0; | |
1069 | #endif | |
1070 | ||
1071 | sourced_login = 0; | |
1072 | ||
1073 | /* A shell begun with the --login (or -l) flag that is not in posix mode | |
1074 | runs the login shell startup files, no matter whether or not it is | |
1075 | interactive. If NON_INTERACTIVE_LOGIN_SHELLS is defined, run the | |
1076 | startup files if argv[0][0] == '-' as well. */ | |
1077 | #if defined (NON_INTERACTIVE_LOGIN_SHELLS) | |
1078 | if (login_shell && posixly_correct == 0) | |
1079 | #else | |
1080 | if (login_shell < 0 && posixly_correct == 0) | |
1081 | #endif | |
1082 | { | |
1083 | /* We don't execute .bashrc for login shells. */ | |
1084 | no_rc++; | |
1085 | ||
1086 | /* Execute /etc/profile and one of the personal login shell | |
1087 | initialization files. */ | |
1088 | if (no_profile == 0) | |
1089 | { | |
1090 | maybe_execute_file (SYS_PROFILE, 1); | |
1091 | ||
1092 | if (act_like_sh) /* sh */ | |
1093 | maybe_execute_file ("~/.profile", 1); | |
1094 | else if ((maybe_execute_file ("~/.bash_profile", 1) == 0) && | |
1095 | (maybe_execute_file ("~/.bash_login", 1) == 0)) /* bash */ | |
1096 | maybe_execute_file ("~/.profile", 1); | |
1097 | } | |
1098 | ||
1099 | sourced_login = 1; | |
1100 | } | |
1101 | ||
1102 | /* A non-interactive shell not named `sh' and not in posix mode reads and | |
1103 | executes commands from $BASH_ENV. If `su' starts a shell with `-c cmd' | |
1104 | and `-su' as the name of the shell, we want to read the startup files. | |
1105 | No other non-interactive shells read any startup files. */ | |
1106 | if (interactive_shell == 0 && !(su_shell && login_shell)) | |
1107 | { | |
1108 | if (posixly_correct == 0 && act_like_sh == 0 && privileged_mode == 0 && | |
1109 | sourced_env++ == 0) | |
1110 | execute_env_file (get_string_value ("BASH_ENV")); | |
1111 | return; | |
1112 | } | |
1113 | ||
1114 | /* Interactive shell or `-su' shell. */ | |
1115 | if (posixly_correct == 0) /* bash, sh */ | |
1116 | { | |
1117 | if (login_shell && sourced_login++ == 0) | |
1118 | { | |
1119 | /* We don't execute .bashrc for login shells. */ | |
1120 | no_rc++; | |
1121 | ||
1122 | /* Execute /etc/profile and one of the personal login shell | |
1123 | initialization files. */ | |
1124 | if (no_profile == 0) | |
1125 | { | |
1126 | maybe_execute_file (SYS_PROFILE, 1); | |
1127 | ||
1128 | if (act_like_sh) /* sh */ | |
1129 | maybe_execute_file ("~/.profile", 1); | |
1130 | else if ((maybe_execute_file ("~/.bash_profile", 1) == 0) && | |
1131 | (maybe_execute_file ("~/.bash_login", 1) == 0)) /* bash */ | |
1132 | maybe_execute_file ("~/.profile", 1); | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | /* bash */ | |
1137 | if (act_like_sh == 0 && no_rc == 0) | |
1138 | { | |
1139 | #ifdef SYS_BASHRC | |
1140 | # if defined (__OPENNT) | |
1141 | maybe_execute_file (_prefixInstallPath(SYS_BASHRC, NULL, 0), 1); | |
1142 | # else | |
1143 | maybe_execute_file (SYS_BASHRC, 1); | |
1144 | # endif | |
1145 | #endif | |
1146 | maybe_execute_file (bashrc_file, 1); | |
1147 | } | |
1148 | /* sh */ | |
1149 | else if (act_like_sh && privileged_mode == 0 && sourced_env++ == 0) | |
1150 | execute_env_file (get_string_value ("ENV")); | |
1151 | } | |
1152 | else /* bash --posix, sh --posix */ | |
1153 | { | |
1154 | /* bash and sh */ | |
1155 | if (interactive_shell && privileged_mode == 0 && sourced_env++ == 0) | |
1156 | execute_env_file (get_string_value ("ENV")); | |
1157 | } | |
1158 | ||
1159 | #if defined (JOB_CONTROL) | |
1160 | set_job_control (old_job_control); | |
1161 | #endif | |
1162 | } | |
1163 | ||
1164 | #if defined (RESTRICTED_SHELL) | |
1165 | /* Return 1 if the shell should be a restricted one based on NAME or the | |
1166 | value of `restricted'. Don't actually do anything, just return a | |
1167 | boolean value. */ | |
1168 | int | |
1169 | shell_is_restricted (name) | |
1170 | char *name; | |
1171 | { | |
1172 | char *temp; | |
1173 | ||
1174 | if (restricted) | |
1175 | return 1; | |
1176 | temp = base_pathname (name); | |
1177 | if (*temp == '-') | |
1178 | temp++; | |
1179 | return (STREQ (temp, RESTRICTED_SHELL_NAME)); | |
1180 | } | |
1181 | ||
1182 | /* Perhaps make this shell a `restricted' one, based on NAME. If the | |
1183 | basename of NAME is "rbash", then this shell is restricted. The | |
1184 | name of the restricted shell is a configurable option, see config.h. | |
1185 | In a restricted shell, PATH, SHELL, ENV, and BASH_ENV are read-only | |
1186 | and non-unsettable. | |
1187 | Do this also if `restricted' is already set to 1; maybe the shell was | |
1188 | started with -r. */ | |
1189 | int | |
1190 | maybe_make_restricted (name) | |
1191 | char *name; | |
1192 | { | |
1193 | char *temp; | |
1194 | ||
1195 | temp = base_pathname (name); | |
1196 | if (*temp == '-') | |
1197 | temp++; | |
1198 | if (restricted || (STREQ (temp, RESTRICTED_SHELL_NAME))) | |
1199 | { | |
1200 | set_var_read_only ("PATH"); | |
1201 | set_var_read_only ("SHELL"); | |
1202 | set_var_read_only ("ENV"); | |
1203 | set_var_read_only ("BASH_ENV"); | |
1204 | restricted = 1; | |
1205 | } | |
1206 | return (restricted); | |
1207 | } | |
1208 | #endif /* RESTRICTED_SHELL */ | |
1209 | ||
1210 | /* Fetch the current set of uids and gids and return 1 if we're running | |
1211 | setuid or setgid. */ | |
1212 | static int | |
1213 | uidget () | |
1214 | { | |
1215 | uid_t u; | |
1216 | ||
1217 | u = getuid (); | |
1218 | if (current_user.uid != u) | |
1219 | { | |
1220 | FREE (current_user.user_name); | |
1221 | FREE (current_user.shell); | |
1222 | FREE (current_user.home_dir); | |
1223 | current_user.user_name = current_user.shell = current_user.home_dir = (char *)NULL; | |
1224 | } | |
1225 | current_user.uid = u; | |
1226 | current_user.gid = getgid (); | |
1227 | current_user.euid = geteuid (); | |
1228 | current_user.egid = getegid (); | |
1229 | ||
1230 | /* See whether or not we are running setuid or setgid. */ | |
1231 | return (current_user.uid != current_user.euid) || | |
1232 | (current_user.gid != current_user.egid); | |
1233 | } | |
1234 | ||
1235 | void | |
1236 | disable_priv_mode () | |
1237 | { | |
1238 | int e; | |
1239 | ||
1240 | if (setuid (current_user.uid) < 0) | |
1241 | { | |
1242 | e = errno; | |
1243 | sys_error (_("cannot set uid to %d: effective uid %d"), current_user.uid, current_user.euid); | |
1244 | #if defined (EXIT_ON_SETUID_FAILURE) | |
1245 | if (e == EAGAIN) | |
1246 | exit (e); | |
1247 | #endif | |
1248 | } | |
1249 | if (setgid (current_user.gid) < 0) | |
1250 | sys_error (_("cannot set gid to %d: effective gid %d"), current_user.gid, current_user.egid); | |
1251 | ||
1252 | current_user.euid = current_user.uid; | |
1253 | current_user.egid = current_user.gid; | |
1254 | } | |
1255 | ||
1256 | #if defined (WORDEXP_OPTION) | |
1257 | static int | |
1258 | run_wordexp (words) | |
1259 | char *words; | |
1260 | { | |
1261 | int code, nw, nb; | |
1262 | WORD_LIST *wl, *tl, *result; | |
1263 | ||
1264 | code = setjmp_nosigs (top_level); | |
1265 | ||
1266 | if (code != NOT_JUMPED) | |
1267 | { | |
1268 | switch (code) | |
1269 | { | |
1270 | /* Some kind of throw to top_level has occurred. */ | |
1271 | case FORCE_EOF: | |
1272 | return last_command_exit_value = 127; | |
1273 | case ERREXIT: | |
1274 | case EXITPROG: | |
1275 | return last_command_exit_value; | |
1276 | case DISCARD: | |
1277 | return last_command_exit_value = 1; | |
1278 | default: | |
1279 | command_error ("run_wordexp", CMDERR_BADJUMP, code, 0); | |
1280 | } | |
1281 | } | |
1282 | ||
1283 | /* Run it through the parser to get a list of words and expand them */ | |
1284 | if (words && *words) | |
1285 | { | |
1286 | with_input_from_string (words, "--wordexp"); | |
1287 | if (parse_command () != 0) | |
1288 | return (126); | |
1289 | if (global_command == 0) | |
1290 | { | |
1291 | printf ("0\n0\n"); | |
1292 | return (0); | |
1293 | } | |
1294 | if (global_command->type != cm_simple) | |
1295 | return (126); | |
1296 | wl = global_command->value.Simple->words; | |
1297 | if (protected_mode) | |
1298 | for (tl = wl; tl; tl = tl->next) | |
1299 | tl->word->flags |= W_NOCOMSUB|W_NOPROCSUB; | |
1300 | result = wl ? expand_words_no_vars (wl) : (WORD_LIST *)0; | |
1301 | } | |
1302 | else | |
1303 | result = (WORD_LIST *)0; | |
1304 | ||
1305 | last_command_exit_value = 0; | |
1306 | ||
1307 | if (result == 0) | |
1308 | { | |
1309 | printf ("0\n0\n"); | |
1310 | return (0); | |
1311 | } | |
1312 | ||
1313 | /* Count up the number of words and bytes, and print them. Don't count | |
1314 | the trailing NUL byte. */ | |
1315 | for (nw = nb = 0, wl = result; wl; wl = wl->next) | |
1316 | { | |
1317 | nw++; | |
1318 | nb += strlen (wl->word->word); | |
1319 | } | |
1320 | printf ("%u\n%u\n", nw, nb); | |
1321 | /* Print each word on a separate line. This will have to be changed when | |
1322 | the interface to glibc is completed. */ | |
1323 | for (wl = result; wl; wl = wl->next) | |
1324 | printf ("%s\n", wl->word->word); | |
1325 | ||
1326 | return (0); | |
1327 | } | |
1328 | #endif | |
1329 | ||
1330 | #if defined (ONESHOT) | |
1331 | /* Run one command, given as the argument to the -c option. Tell | |
1332 | parse_and_execute not to fork for a simple command. */ | |
1333 | static int | |
1334 | run_one_command (command) | |
1335 | char *command; | |
1336 | { | |
1337 | int code; | |
1338 | ||
1339 | code = setjmp_nosigs (top_level); | |
1340 | ||
1341 | if (code != NOT_JUMPED) | |
1342 | { | |
1343 | #if defined (PROCESS_SUBSTITUTION) | |
1344 | unlink_fifo_list (); | |
1345 | #endif /* PROCESS_SUBSTITUTION */ | |
1346 | switch (code) | |
1347 | { | |
1348 | /* Some kind of throw to top_level has occurred. */ | |
1349 | case FORCE_EOF: | |
1350 | return last_command_exit_value = 127; | |
1351 | case ERREXIT: | |
1352 | case EXITPROG: | |
1353 | return last_command_exit_value; | |
1354 | case DISCARD: | |
1355 | return last_command_exit_value = 1; | |
1356 | default: | |
1357 | command_error ("run_one_command", CMDERR_BADJUMP, code, 0); | |
1358 | } | |
1359 | } | |
1360 | return (parse_and_execute (savestring (command), "-c", SEVAL_NOHIST)); | |
1361 | } | |
1362 | #endif /* ONESHOT */ | |
1363 | ||
1364 | static int | |
1365 | bind_args (argv, arg_start, arg_end, start_index) | |
1366 | char **argv; | |
1367 | int arg_start, arg_end, start_index; | |
1368 | { | |
1369 | register int i; | |
1370 | WORD_LIST *args; | |
1371 | ||
1372 | for (i = arg_start, args = (WORD_LIST *)NULL; i < arg_end; i++) | |
1373 | args = make_word_list (make_word (argv[i]), args); | |
1374 | if (args) | |
1375 | { | |
1376 | args = REVERSE_LIST (args, WORD_LIST *); | |
1377 | if (start_index == 0) /* bind to $0...$n for sh -c command */ | |
1378 | { | |
1379 | /* Posix.2 4.56.3 says that the first argument after sh -c command | |
1380 | becomes $0, and the rest of the arguments become $1...$n */ | |
1381 | shell_name = savestring (args->word->word); | |
1382 | FREE (dollar_vars[0]); | |
1383 | dollar_vars[0] = savestring (args->word->word); | |
1384 | remember_args (args->next, 1); | |
1385 | push_args (args->next); /* BASH_ARGV and BASH_ARGC */ | |
1386 | } | |
1387 | else /* bind to $1...$n for shell script */ | |
1388 | { | |
1389 | remember_args (args, 1); | |
1390 | push_args (args); /* BASH_ARGV and BASH_ARGC */ | |
1391 | } | |
1392 | ||
1393 | dispose_words (args); | |
1394 | } | |
1395 | ||
1396 | return (i); | |
1397 | } | |
1398 | ||
1399 | void | |
1400 | unbind_args () | |
1401 | { | |
1402 | remember_args ((WORD_LIST *)NULL, 1); | |
1403 | pop_args (); /* Reset BASH_ARGV and BASH_ARGC */ | |
1404 | } | |
1405 | ||
1406 | static void | |
1407 | start_debugger () | |
1408 | { | |
1409 | #if defined (DEBUGGER) && defined (DEBUGGER_START_FILE) | |
1410 | int old_errexit; | |
1411 | int r; | |
1412 | ||
1413 | old_errexit = exit_immediately_on_error; | |
1414 | exit_immediately_on_error = 0; | |
1415 | ||
1416 | r = force_execute_file (DEBUGGER_START_FILE, 1); | |
1417 | itrace("start_debugger: force_execute_file returns %d", r); | |
1418 | function_trace_mode = 1; | |
1419 | ||
1420 | exit_immediately_on_error += old_errexit; | |
1421 | #endif | |
1422 | } | |
1423 | ||
1424 | static int | |
1425 | open_shell_script (script_name) | |
1426 | char *script_name; | |
1427 | { | |
1428 | int fd, e, fd_is_tty; | |
1429 | char *filename, *path_filename, *t; | |
1430 | char sample[80]; | |
1431 | int sample_len; | |
1432 | struct stat sb; | |
1433 | #if defined (ARRAY_VARS) | |
1434 | SHELL_VAR *funcname_v, *bash_source_v, *bash_lineno_v; | |
1435 | ARRAY *funcname_a, *bash_source_a, *bash_lineno_a; | |
1436 | #endif | |
1437 | ||
1438 | filename = savestring (script_name); | |
1439 | ||
1440 | fd = open (filename, O_RDONLY); | |
1441 | if ((fd < 0) && (errno == ENOENT) && (absolute_program (filename) == 0)) | |
1442 | { | |
1443 | e = errno; | |
1444 | /* If it's not in the current directory, try looking through PATH | |
1445 | for it. */ | |
1446 | path_filename = find_path_file (script_name); | |
1447 | if (path_filename) | |
1448 | { | |
1449 | free (filename); | |
1450 | filename = path_filename; | |
1451 | fd = open (filename, O_RDONLY); | |
1452 | } | |
1453 | else | |
1454 | errno = e; | |
1455 | } | |
1456 | ||
1457 | if (fd < 0) | |
1458 | { | |
1459 | e = errno; | |
1460 | file_error (filename); | |
1461 | exit ((e == ENOENT) ? EX_NOTFOUND : EX_NOINPUT); | |
1462 | } | |
1463 | ||
1464 | free (dollar_vars[0]); | |
1465 | dollar_vars[0] = exec_argv0 ? savestring (exec_argv0) : savestring (script_name); | |
1466 | if (exec_argv0) | |
1467 | { | |
1468 | free (exec_argv0); | |
1469 | exec_argv0 = (char *)NULL; | |
1470 | } | |
1471 | ||
1472 | #if defined (ARRAY_VARS) | |
1473 | GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a); | |
1474 | GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a); | |
1475 | GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a); | |
1476 | ||
1477 | array_push (bash_source_a, filename); | |
1478 | if (bash_lineno_a) | |
1479 | { | |
1480 | t = itos (executing_line_number ()); | |
1481 | array_push (bash_lineno_a, t); | |
1482 | free (t); | |
1483 | } | |
1484 | array_push (funcname_a, "main"); | |
1485 | #endif | |
1486 | ||
1487 | #ifdef HAVE_DEV_FD | |
1488 | fd_is_tty = isatty (fd); | |
1489 | #else | |
1490 | fd_is_tty = 0; | |
1491 | #endif | |
1492 | ||
1493 | /* Only do this with non-tty file descriptors we can seek on. */ | |
1494 | if (fd_is_tty == 0 && (lseek (fd, 0L, 1) != -1)) | |
1495 | { | |
1496 | /* Check to see if the `file' in `bash file' is a binary file | |
1497 | according to the same tests done by execute_simple_command (), | |
1498 | and report an error and exit if it is. */ | |
1499 | sample_len = read (fd, sample, sizeof (sample)); | |
1500 | if (sample_len < 0) | |
1501 | { | |
1502 | e = errno; | |
1503 | if ((fstat (fd, &sb) == 0) && S_ISDIR (sb.st_mode)) | |
1504 | internal_error (_("%s: is a directory"), filename); | |
1505 | else | |
1506 | { | |
1507 | errno = e; | |
1508 | file_error (filename); | |
1509 | } | |
1510 | exit (EX_NOEXEC); | |
1511 | } | |
1512 | else if (sample_len > 0 && (check_binary_file (sample, sample_len))) | |
1513 | { | |
1514 | internal_error (_("%s: cannot execute binary file"), filename); | |
1515 | exit (EX_BINARY_FILE); | |
1516 | } | |
1517 | /* Now rewind the file back to the beginning. */ | |
1518 | lseek (fd, 0L, 0); | |
1519 | } | |
1520 | ||
1521 | /* Open the script. But try to move the file descriptor to a randomly | |
1522 | large one, in the hopes that any descriptors used by the script will | |
1523 | not match with ours. */ | |
1524 | fd = move_to_high_fd (fd, 1, -1); | |
1525 | ||
1526 | #if defined (BUFFERED_INPUT) | |
1527 | default_buffered_input = fd; | |
1528 | SET_CLOSE_ON_EXEC (default_buffered_input); | |
1529 | #else /* !BUFFERED_INPUT */ | |
1530 | default_input = fdopen (fd, "r"); | |
1531 | ||
1532 | if (default_input == 0) | |
1533 | { | |
1534 | file_error (filename); | |
1535 | exit (EX_NOTFOUND); | |
1536 | } | |
1537 | ||
1538 | SET_CLOSE_ON_EXEC (fd); | |
1539 | if (fileno (default_input) != fd) | |
1540 | SET_CLOSE_ON_EXEC (fileno (default_input)); | |
1541 | #endif /* !BUFFERED_INPUT */ | |
1542 | ||
1543 | /* Just about the only way for this code to be executed is if something | |
1544 | like `bash -i /dev/stdin' is executed. */ | |
1545 | if (interactive_shell && fd_is_tty) | |
1546 | { | |
1547 | dup2 (fd, 0); | |
1548 | close (fd); | |
1549 | fd = 0; | |
1550 | #if defined (BUFFERED_INPUT) | |
1551 | default_buffered_input = 0; | |
1552 | #else | |
1553 | fclose (default_input); | |
1554 | default_input = stdin; | |
1555 | #endif | |
1556 | } | |
1557 | else if (forced_interactive && fd_is_tty == 0) | |
1558 | /* But if a script is called with something like `bash -i scriptname', | |
1559 | we need to do a non-interactive setup here, since we didn't do it | |
1560 | before. */ | |
1561 | init_interactive_script (); | |
1562 | ||
1563 | free (filename); | |
1564 | return (fd); | |
1565 | } | |
1566 | ||
1567 | /* Initialize the input routines for the parser. */ | |
1568 | static void | |
1569 | set_bash_input () | |
1570 | { | |
1571 | /* Make sure the fd from which we are reading input is not in | |
1572 | no-delay mode. */ | |
1573 | #if defined (BUFFERED_INPUT) | |
1574 | if (interactive == 0) | |
1575 | sh_unset_nodelay_mode (default_buffered_input); | |
1576 | else | |
1577 | #endif /* !BUFFERED_INPUT */ | |
1578 | sh_unset_nodelay_mode (fileno (stdin)); | |
1579 | ||
1580 | /* with_input_from_stdin really means `with_input_from_readline' */ | |
1581 | if (interactive && no_line_editing == 0) | |
1582 | with_input_from_stdin (); | |
1583 | #if defined (BUFFERED_INPUT) | |
1584 | else if (interactive == 0) | |
1585 | with_input_from_buffered_stream (default_buffered_input, dollar_vars[0]); | |
1586 | #endif /* BUFFERED_INPUT */ | |
1587 | else | |
1588 | with_input_from_stream (default_input, dollar_vars[0]); | |
1589 | } | |
1590 | ||
1591 | /* Close the current shell script input source and forget about it. This is | |
1592 | extern so execute_cmd.c:initialize_subshell() can call it. If CHECK_ZERO | |
1593 | is non-zero, we close default_buffered_input even if it's the standard | |
1594 | input (fd 0). */ | |
1595 | void | |
1596 | unset_bash_input (check_zero) | |
1597 | int check_zero; | |
1598 | { | |
1599 | #if defined (BUFFERED_INPUT) | |
1600 | if ((check_zero && default_buffered_input >= 0) || | |
1601 | (check_zero == 0 && default_buffered_input > 0)) | |
1602 | { | |
1603 | close_buffered_fd (default_buffered_input); | |
1604 | default_buffered_input = bash_input.location.buffered_fd = -1; | |
1605 | bash_input.type = st_none; /* XXX */ | |
1606 | } | |
1607 | #else /* !BUFFERED_INPUT */ | |
1608 | if (default_input) | |
1609 | { | |
1610 | fclose (default_input); | |
1611 | default_input = (FILE *)NULL; | |
1612 | } | |
1613 | #endif /* !BUFFERED_INPUT */ | |
1614 | } | |
1615 | ||
1616 | ||
1617 | #if !defined (PROGRAM) | |
1618 | # define PROGRAM "bash" | |
1619 | #endif | |
1620 | ||
1621 | static void | |
1622 | set_shell_name (argv0) | |
1623 | char *argv0; | |
1624 | { | |
1625 | /* Here's a hack. If the name of this shell is "sh", then don't do | |
1626 | any startup files; just try to be more like /bin/sh. */ | |
1627 | shell_name = argv0 ? base_pathname (argv0) : PROGRAM; | |
1628 | ||
1629 | if (argv0 && *argv0 == '-') | |
1630 | { | |
1631 | if (*shell_name == '-') | |
1632 | shell_name++; | |
1633 | login_shell = 1; | |
1634 | } | |
1635 | ||
1636 | if (shell_name[0] == 's' && shell_name[1] == 'h' && shell_name[2] == '\0') | |
1637 | act_like_sh++; | |
1638 | if (shell_name[0] == 's' && shell_name[1] == 'u' && shell_name[2] == '\0') | |
1639 | su_shell++; | |
1640 | ||
1641 | shell_name = argv0 ? argv0 : PROGRAM; | |
1642 | FREE (dollar_vars[0]); | |
1643 | dollar_vars[0] = savestring (shell_name); | |
1644 | ||
1645 | /* A program may start an interactive shell with | |
1646 | "execl ("/bin/bash", "-", NULL)". | |
1647 | If so, default the name of this shell to our name. */ | |
1648 | if (!shell_name || !*shell_name || (shell_name[0] == '-' && !shell_name[1])) | |
1649 | shell_name = PROGRAM; | |
1650 | } | |
1651 | ||
1652 | static void | |
1653 | init_interactive () | |
1654 | { | |
1655 | expand_aliases = interactive_shell = startup_state = 1; | |
1656 | interactive = 1; | |
1657 | } | |
1658 | ||
1659 | static void | |
1660 | init_noninteractive () | |
1661 | { | |
1662 | #if defined (HISTORY) | |
1663 | bash_history_reinit (0); | |
1664 | #endif /* HISTORY */ | |
1665 | interactive_shell = startup_state = interactive = 0; | |
1666 | expand_aliases = posixly_correct; /* XXX - was 0 not posixly_correct */ | |
1667 | no_line_editing = 1; | |
1668 | #if defined (JOB_CONTROL) | |
1669 | /* Even if the shell is not interactive, enable job control if the -i or | |
1670 | -m option is supplied at startup. */ | |
1671 | set_job_control (forced_interactive||jobs_m_flag); | |
1672 | #endif /* JOB_CONTROL */ | |
1673 | } | |
1674 | ||
1675 | static void | |
1676 | init_interactive_script () | |
1677 | { | |
1678 | init_noninteractive (); | |
1679 | expand_aliases = interactive_shell = startup_state = 1; | |
1680 | } | |
1681 | ||
1682 | void | |
1683 | get_current_user_info () | |
1684 | { | |
1685 | struct passwd *entry; | |
1686 | ||
1687 | /* Don't fetch this more than once. */ | |
1688 | if (current_user.user_name == 0) | |
1689 | { | |
1690 | #if defined (__TANDEM) | |
1691 | entry = getpwnam (getlogin ()); | |
1692 | #else | |
1693 | entry = getpwuid (current_user.uid); | |
1694 | #endif | |
1695 | if (entry) | |
1696 | { | |
1697 | current_user.user_name = savestring (entry->pw_name); | |
1698 | current_user.shell = (entry->pw_shell && entry->pw_shell[0]) | |
1699 | ? savestring (entry->pw_shell) | |
1700 | : savestring ("/bin/sh"); | |
1701 | current_user.home_dir = savestring (entry->pw_dir); | |
1702 | } | |
1703 | else | |
1704 | { | |
1705 | current_user.user_name = _("I have no name!"); | |
1706 | current_user.user_name = savestring (current_user.user_name); | |
1707 | current_user.shell = savestring ("/bin/sh"); | |
1708 | current_user.home_dir = savestring ("/"); | |
1709 | } | |
1710 | endpwent (); | |
1711 | } | |
1712 | } | |
1713 | ||
1714 | /* Do whatever is necessary to initialize the shell. | |
1715 | Put new initializations in here. */ | |
1716 | static void | |
1717 | shell_initialize () | |
1718 | { | |
1719 | char hostname[256]; | |
1720 | int should_be_restricted; | |
1721 | ||
1722 | /* Line buffer output for stderr and stdout. */ | |
1723 | if (shell_initialized == 0) | |
1724 | { | |
1725 | sh_setlinebuf (stderr); | |
1726 | sh_setlinebuf (stdout); | |
1727 | } | |
1728 | ||
1729 | /* Sort the array of shell builtins so that the binary search in | |
1730 | find_shell_builtin () works correctly. */ | |
1731 | initialize_shell_builtins (); | |
1732 | ||
1733 | /* Initialize the trap signal handlers before installing our own | |
1734 | signal handlers. traps.c:restore_original_signals () is responsible | |
1735 | for restoring the original default signal handlers. That function | |
1736 | is called when we make a new child. */ | |
1737 | initialize_traps (); | |
1738 | initialize_signals (0); | |
1739 | ||
1740 | /* It's highly unlikely that this will change. */ | |
1741 | if (current_host_name == 0) | |
1742 | { | |
1743 | /* Initialize current_host_name. */ | |
1744 | if (gethostname (hostname, 255) < 0) | |
1745 | current_host_name = "??host??"; | |
1746 | else | |
1747 | current_host_name = savestring (hostname); | |
1748 | } | |
1749 | ||
1750 | /* Initialize the stuff in current_user that comes from the password | |
1751 | file. We don't need to do this right away if the shell is not | |
1752 | interactive. */ | |
1753 | if (interactive_shell) | |
1754 | get_current_user_info (); | |
1755 | ||
1756 | /* Initialize our interface to the tilde expander. */ | |
1757 | tilde_initialize (); | |
1758 | ||
1759 | #if defined (RESTRICTED_SHELL) | |
1760 | should_be_restricted = shell_is_restricted (shell_name); | |
1761 | #endif | |
1762 | ||
1763 | /* Initialize internal and environment variables. Don't import shell | |
1764 | functions from the environment if we are running in privileged or | |
1765 | restricted mode or if the shell is running setuid. */ | |
1766 | #if defined (RESTRICTED_SHELL) | |
1767 | initialize_shell_variables (shell_environment, privileged_mode||restricted||should_be_restricted||running_setuid); | |
1768 | #else | |
1769 | initialize_shell_variables (shell_environment, privileged_mode||running_setuid); | |
1770 | #endif | |
1771 | ||
1772 | /* Initialize the data structures for storing and running jobs. */ | |
1773 | initialize_job_control (jobs_m_flag); | |
1774 | ||
1775 | /* Initialize input streams to null. */ | |
1776 | initialize_bash_input (); | |
1777 | ||
1778 | initialize_flags (); | |
1779 | ||
1780 | /* Initialize the shell options. Don't import the shell options | |
1781 | from the environment variables $SHELLOPTS or $BASHOPTS if we are | |
1782 | running in privileged or restricted mode or if the shell is running | |
1783 | setuid. */ | |
1784 | #if defined (RESTRICTED_SHELL) | |
1785 | initialize_shell_options (privileged_mode||restricted||should_be_restricted||running_setuid); | |
1786 | initialize_bashopts (privileged_mode||restricted||should_be_restricted||running_setuid); | |
1787 | #else | |
1788 | initialize_shell_options (privileged_mode||running_setuid); | |
1789 | initialize_bashopts (privileged_mode||running_setuid); | |
1790 | #endif | |
1791 | } | |
1792 | ||
1793 | /* Function called by main () when it appears that the shell has already | |
1794 | had some initialization performed. This is supposed to reset the world | |
1795 | back to a pristine state, as if we had been exec'ed. */ | |
1796 | static void | |
1797 | shell_reinitialize () | |
1798 | { | |
1799 | /* The default shell prompts. */ | |
1800 | primary_prompt = PPROMPT; | |
1801 | secondary_prompt = SPROMPT; | |
1802 | ||
1803 | /* Things that get 1. */ | |
1804 | current_command_number = 1; | |
1805 | ||
1806 | /* We have decided that the ~/.bashrc file should not be executed | |
1807 | for the invocation of each shell script. If the variable $ENV | |
1808 | (or $BASH_ENV) is set, its value is used as the name of a file | |
1809 | to source. */ | |
1810 | no_rc = no_profile = 1; | |
1811 | ||
1812 | /* Things that get 0. */ | |
1813 | login_shell = make_login_shell = interactive = executing = 0; | |
1814 | debugging = do_version = line_number = last_command_exit_value = 0; | |
1815 | forced_interactive = interactive_shell = 0; | |
1816 | subshell_environment = running_in_background = 0; | |
1817 | expand_aliases = 0; | |
1818 | ||
1819 | /* XXX - should we set jobs_m_flag to 0 here? */ | |
1820 | ||
1821 | #if defined (HISTORY) | |
1822 | bash_history_reinit (0); | |
1823 | #endif /* HISTORY */ | |
1824 | ||
1825 | #if defined (RESTRICTED_SHELL) | |
1826 | restricted = 0; | |
1827 | #endif /* RESTRICTED_SHELL */ | |
1828 | ||
1829 | /* Ensure that the default startup file is used. (Except that we don't | |
1830 | execute this file for reinitialized shells). */ | |
1831 | bashrc_file = DEFAULT_BASHRC; | |
1832 | ||
1833 | /* Delete all variables and functions. They will be reinitialized when | |
1834 | the environment is parsed. */ | |
1835 | delete_all_contexts (shell_variables); | |
1836 | delete_all_variables (shell_functions); | |
1837 | ||
1838 | reinit_special_variables (); | |
1839 | ||
1840 | #if defined (READLINE) | |
1841 | bashline_reinitialize (); | |
1842 | #endif | |
1843 | ||
1844 | shell_reinitialized = 1; | |
1845 | } | |
1846 | ||
1847 | static void | |
1848 | show_shell_usage (fp, extra) | |
1849 | FILE *fp; | |
1850 | int extra; | |
1851 | { | |
1852 | int i; | |
1853 | char *set_opts, *s, *t; | |
1854 | ||
1855 | if (extra) | |
1856 | fprintf (fp, _("GNU bash, version %s-(%s)\n"), shell_version_string (), MACHTYPE); | |
1857 | fprintf (fp, _("Usage:\t%s [GNU long option] [option] ...\n\t%s [GNU long option] [option] script-file ...\n"), | |
1858 | shell_name, shell_name); | |
1859 | fputs (_("GNU long options:\n"), fp); | |
1860 | for (i = 0; long_args[i].name; i++) | |
1861 | fprintf (fp, "\t--%s\n", long_args[i].name); | |
1862 | ||
1863 | fputs (_("Shell options:\n"), fp); | |
1864 | fputs (_("\t-ilrsD or -c command or -O shopt_option\t\t(invocation only)\n"), fp); | |
1865 | ||
1866 | for (i = 0, set_opts = 0; shell_builtins[i].name; i++) | |
1867 | if (STREQ (shell_builtins[i].name, "set")) | |
1868 | set_opts = savestring (shell_builtins[i].short_doc); | |
1869 | if (set_opts) | |
1870 | { | |
1871 | s = strchr (set_opts, '['); | |
1872 | if (s == 0) | |
1873 | s = set_opts; | |
1874 | while (*++s == '-') | |
1875 | ; | |
1876 | t = strchr (s, ']'); | |
1877 | if (t) | |
1878 | *t = '\0'; | |
1879 | fprintf (fp, _("\t-%s or -o option\n"), s); | |
1880 | free (set_opts); | |
1881 | } | |
1882 | ||
1883 | if (extra) | |
1884 | { | |
1885 | fprintf (fp, _("Type `%s -c \"help set\"' for more information about shell options.\n"), shell_name); | |
1886 | fprintf (fp, _("Type `%s -c help' for more information about shell builtin commands.\n"), shell_name); | |
1887 | fprintf (fp, _("Use the `bashbug' command to report bugs.\n")); | |
1888 | } | |
1889 | } | |
1890 | ||
1891 | static void | |
1892 | add_shopt_to_alist (opt, on_or_off) | |
1893 | char *opt; | |
1894 | int on_or_off; | |
1895 | { | |
1896 | if (shopt_ind >= shopt_len) | |
1897 | { | |
1898 | shopt_len += 8; | |
1899 | shopt_alist = (STRING_INT_ALIST *)xrealloc (shopt_alist, shopt_len * sizeof (shopt_alist[0])); | |
1900 | } | |
1901 | shopt_alist[shopt_ind].word = opt; | |
1902 | shopt_alist[shopt_ind].token = on_or_off; | |
1903 | shopt_ind++; | |
1904 | } | |
1905 | ||
1906 | static void | |
1907 | run_shopt_alist () | |
1908 | { | |
1909 | register int i; | |
1910 | ||
1911 | for (i = 0; i < shopt_ind; i++) | |
1912 | if (shopt_setopt (shopt_alist[i].word, (shopt_alist[i].token == '-')) != EXECUTION_SUCCESS) | |
1913 | exit (EX_BADUSAGE); | |
1914 | free (shopt_alist); | |
1915 | shopt_alist = 0; | |
1916 | shopt_ind = shopt_len = 0; | |
1917 | } |