blob: 9cda97f30e3c7fb241bf74b12b49f54f4565e0fc [file] [log] [blame]
Tom Rini10e47792018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
wdenkfe8c2802002-11-03 00:38:21 +00002/*
3 * sh.c -- a prototype Bourne shell grammar parser
4 * Intended to follow the original Thompson and Ritchie
5 * "small and simple is beautiful" philosophy, which
6 * incidentally is a good match to today's BusyBox.
7 *
8 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
9 *
10 * Credits:
11 * The parser routines proper are all original material, first
12 * written Dec 2000 and Jan 2001 by Larry Doolittle.
13 * The execution engine, the builtins, and much of the underlying
14 * support has been adapted from busybox-0.49pre's lash,
15 * which is Copyright (C) 2000 by Lineo, Inc., and
16 * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
17 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
18 * Erik W. Troan, which they placed in the public domain. I don't know
19 * how much of the Johnson/Troan code has survived the repeated rewrites.
20 * Other credits:
wdenkfe8c2802002-11-03 00:38:21 +000021 * b_addchr() derived from similar w_addchar function in glibc-2.2
22 * setup_redirect(), redirect_opt_num(), and big chunks of main()
23 * and many builtins derived from contributions by Erik Andersen
24 * miscellaneous bugfixes from Matt Kraai
25 *
26 * There are two big (and related) architecture differences between
27 * this parser and the lash parser. One is that this version is
28 * actually designed from the ground up to understand nearly all
29 * of the Bourne grammar. The second, consequential change is that
30 * the parser and input reader have been turned inside out. Now,
31 * the parser is in control, and asks for input as needed. The old
32 * way had the input reader in control, and it asked for parsing to
33 * take place as needed. The new way makes it much easier to properly
34 * handle the recursion implicit in the various substitutions, especially
35 * across continuation lines.
36 *
37 * Bash grammar not implemented: (how many of these were in original sh?)
38 * $@ (those sure look like weird quoting rules)
39 * $_
40 * ! negation operator for pipes
41 * &> and >& redirection of stdout+stderr
42 * Brace Expansion
43 * Tilde Expansion
44 * fancy forms of Parameter Expansion
45 * aliases
46 * Arithmetic Expansion
47 * <(list) and >(list) Process Substitution
48 * reserved words: case, esac, select, function
49 * Here Documents ( << word )
50 * Functions
51 * Major bugs:
52 * job handling woefully incomplete and buggy
53 * reserved word execution woefully incomplete and buggy
54 * to-do:
55 * port selected bugfixes from post-0.49 busybox lash - done?
56 * finish implementing reserved words: for, while, until, do, done
57 * change { and } from special chars to reserved words
58 * builtins: break, continue, eval, return, set, trap, ulimit
59 * test magic exec
60 * handle children going into background
61 * clean up recognition of null pipes
62 * check setting of global_argc and global_argv
63 * control-C handling, probably with longjmp
64 * follow IFS rules more precisely, including update semantics
65 * figure out what to do with backslash-newline
66 * explain why we use signal instead of sigaction
67 * propagate syntax errors, die on resource errors?
68 * continuation lines, both explicit and implicit - done?
69 * memory leak finding and plugging - done?
70 * more testing, especially quoting rules and redirection
71 * document how quoting rules not precisely followed for variable assignments
72 * maybe change map[] to use 2-bit entries
73 * (eventually) remove all the printf's
wdenkfe8c2802002-11-03 00:38:21 +000074 */
Wolfgang Denkd79de1d2013-07-08 09:37:19 +020075
wdenkfe8c2802002-11-03 00:38:21 +000076#define __U_BOOT__
77#ifdef __U_BOOT__
Tom Riniabb9a042024-05-18 20:20:43 -060078#include <common.h> /* readline */
Simon Glass5e6201b2019-08-01 09:46:51 -060079#include <env.h>
wdenkfe8c2802002-11-03 00:38:21 +000080#include <malloc.h> /* malloc, free, realloc*/
81#include <linux/ctype.h> /* isalpha, isdigit */
Simon Glassa73bda42015-11-08 23:47:45 -070082#include <console.h>
Simon Glass399ed9a2014-04-10 20:01:30 -060083#include <bootretry.h>
Simon Glassdec3c012014-04-10 20:01:25 -060084#include <cli.h>
Simon Glass299f0be2014-04-10 20:01:24 -060085#include <cli_hush.h>
wdenkfe8c2802002-11-03 00:38:21 +000086#include <command.h> /* find_cmd */
Simon Glass3ba929a2020-10-30 21:38:53 -060087#include <asm/global_data.h>
wdenkfe8c2802002-11-03 00:38:21 +000088#endif
wdenkfe8c2802002-11-03 00:38:21 +000089#ifndef __U_BOOT__
90#include <ctype.h> /* isalpha, isdigit */
91#include <unistd.h> /* getpid */
92#include <stdlib.h> /* getenv, atoi */
93#include <string.h> /* strchr */
94#include <stdio.h> /* popen etc. */
95#include <glob.h> /* glob, of course */
96#include <stdarg.h> /* va_list */
97#include <errno.h>
98#include <fcntl.h>
99#include <getopt.h> /* should be pretty obvious */
100
101#include <sys/stat.h> /* ulimit */
102#include <sys/types.h>
103#include <sys/wait.h>
104#include <signal.h>
105
106/* #include <dmalloc.h> */
wdenkfe8c2802002-11-03 00:38:21 +0000107
wdenke7f34c62003-01-11 09:48:40 +0000108#if 1
wdenkfe8c2802002-11-03 00:38:21 +0000109#include "busybox.h"
110#include "cmdedit.h"
111#else
112#define applet_name "hush"
113#include "standalone.h"
114#define hush_main main
wdenke7f34c62003-01-11 09:48:40 +0000115#define BB_BANNER
wdenkfe8c2802002-11-03 00:38:21 +0000116#endif
117#endif
118#define SPECIAL_VAR_SYMBOL 03
Joe Hershberger38de0b62012-08-17 10:26:30 +0000119#define SUBSTED_VAR_SYMBOL 04
wdenkfe8c2802002-11-03 00:38:21 +0000120#ifndef __U_BOOT__
121#define FLAG_EXIT_FROM_LOOP 1
122#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
123#define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
124
125#endif
126
127#ifdef __U_BOOT__
Wolfgang Denk6405a152006-03-31 18:32:53 +0200128DECLARE_GLOBAL_DATA_PTR;
129
wdenkfe8c2802002-11-03 00:38:21 +0000130#define EXIT_SUCCESS 0
131#define EOF -1
132#define syntax() syntax_err()
133#define xstrdup strdup
134#define error_msg printf
135#else
136typedef enum {
137 REDIRECT_INPUT = 1,
138 REDIRECT_OVERWRITE = 2,
139 REDIRECT_APPEND = 3,
140 REDIRECT_HEREIS = 4,
141 REDIRECT_IO = 5
142} redir_type;
143
144/* The descrip member of this structure is only used to make debugging
145 * output pretty */
146struct {int mode; int default_fd; char *descrip;} redir_table[] = {
147 { 0, 0, "()" },
148 { O_RDONLY, 0, "<" },
149 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
150 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
151 { O_RDONLY, -1, "<<" },
152 { O_RDWR, 1, "<>" }
153};
154#endif
155
156typedef enum {
157 PIPE_SEQ = 1,
158 PIPE_AND = 2,
159 PIPE_OR = 3,
160 PIPE_BG = 4,
161} pipe_style;
162
163/* might eventually control execution */
164typedef enum {
165 RES_NONE = 0,
166 RES_IF = 1,
167 RES_THEN = 2,
168 RES_ELIF = 3,
169 RES_ELSE = 4,
170 RES_FI = 5,
171 RES_FOR = 6,
172 RES_WHILE = 7,
173 RES_UNTIL = 8,
174 RES_DO = 9,
175 RES_DONE = 10,
176 RES_XXXX = 11,
177 RES_IN = 12,
178 RES_SNTX = 13
179} reserved_style;
180#define FLAG_END (1<<RES_NONE)
181#define FLAG_IF (1<<RES_IF)
182#define FLAG_THEN (1<<RES_THEN)
183#define FLAG_ELIF (1<<RES_ELIF)
184#define FLAG_ELSE (1<<RES_ELSE)
185#define FLAG_FI (1<<RES_FI)
186#define FLAG_FOR (1<<RES_FOR)
187#define FLAG_WHILE (1<<RES_WHILE)
188#define FLAG_UNTIL (1<<RES_UNTIL)
189#define FLAG_DO (1<<RES_DO)
190#define FLAG_DONE (1<<RES_DONE)
191#define FLAG_IN (1<<RES_IN)
192#define FLAG_START (1<<RES_XXXX)
193
194/* This holds pointers to the various results of parsing */
195struct p_context {
196 struct child_prog *child;
197 struct pipe *list_head;
198 struct pipe *pipe;
199#ifndef __U_BOOT__
200 struct redir_struct *pending_redirect;
201#endif
202 reserved_style w;
203 int old_flag; /* for figuring out valid reserved words */
204 struct p_context *stack;
205 int type; /* define type of parser : ";$" common or special symbol */
206 /* How about quoting status? */
207};
208
209#ifndef __U_BOOT__
210struct redir_struct {
211 redir_type type; /* type of redirection */
212 int fd; /* file descriptor being redirected */
213 int dup; /* -1, or file descriptor being duplicated */
214 struct redir_struct *next; /* pointer to the next redirect in the list */
215 glob_t word; /* *word.gl_pathv is the filename */
216};
217#endif
218
219struct child_prog {
220#ifndef __U_BOOT__
221 pid_t pid; /* 0 if exited */
222#endif
223 char **argv; /* program name and arguments */
Stephen Warren60c38c92014-03-01 22:16:10 -0700224 /* was quoted when parsed; copy of struct o_string.nonnull field */
Simon Glass299f0be2014-04-10 20:01:24 -0600225 int *argv_nonnull;
wdenkfe8c2802002-11-03 00:38:21 +0000226#ifdef __U_BOOT__
227 int argc; /* number of program arguments */
228#endif
229 struct pipe *group; /* if non-NULL, first in group or subshell */
230#ifndef __U_BOOT__
231 int subshell; /* flag, non-zero if group must be forked */
232 struct redir_struct *redirects; /* I/O redirections */
233 glob_t glob_result; /* result of parameter globbing */
234 int is_stopped; /* is the program currently running? */
235 struct pipe *family; /* pointer back to the child's parent pipe */
236#endif
237 int sp; /* number of SPECIAL_VAR_SYMBOL */
238 int type;
239};
240
241struct pipe {
242#ifndef __U_BOOT__
243 int jobid; /* job number */
244#endif
245 int num_progs; /* total number of programs in job */
246#ifndef __U_BOOT__
247 int running_progs; /* number of programs running */
248 char *text; /* name of job */
249 char *cmdbuf; /* buffer various argv's point into */
250 pid_t pgrp; /* process group ID for the job */
251#endif
252 struct child_prog *progs; /* array of commands in pipe */
253 struct pipe *next; /* to track background commands */
254#ifndef __U_BOOT__
255 int stopped_progs; /* number of programs alive, but stopped */
256 int job_context; /* bitmask defining current context */
257#endif
258 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
259 reserved_style r_mode; /* supports if, for, while, until */
260};
261
262#ifndef __U_BOOT__
263struct close_me {
264 int fd;
265 struct close_me *next;
266};
267#endif
268
269struct variables {
270 char *name;
271 char *value;
272 int flg_export;
273 int flg_read_only;
274 struct variables *next;
275};
276
277/* globals, connect us to the outside world
278 * the first three support $?, $#, and $1 */
279#ifndef __U_BOOT__
280char **global_argv;
281unsigned int global_argc;
282#endif
Kim Phillipsb052b602012-10-29 13:34:32 +0000283static unsigned int last_return_code;
wdenkfe8c2802002-11-03 00:38:21 +0000284#ifndef __U_BOOT__
285extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
286#endif
287
288/* "globals" within this file */
Wolfgang Denk7fb52662005-10-13 16:45:02 +0200289static uchar *ifs;
wdenkfe8c2802002-11-03 00:38:21 +0000290static char map[256];
291#ifndef __U_BOOT__
292static int fake_mode;
293static int interactive;
294static struct close_me *close_me_head;
295static const char *cwd;
296static struct pipe *job_list;
297static unsigned int last_bg_pid;
298static unsigned int last_jobid;
299static unsigned int shell_terminal;
300static char *PS1;
301static char *PS2;
302struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
303struct variables *top_vars = &shell_ver;
304#else
305static int flag_repeat = 0;
306static int do_repeat = 0;
wdenkbd1575f2003-10-14 19:43:55 +0000307static struct variables *top_vars = NULL ;
wdenkfe8c2802002-11-03 00:38:21 +0000308#endif /*__U_BOOT__ */
309
310#define B_CHUNK (100)
311#define B_NOSPAC 1
312
313typedef struct {
314 char *data;
315 int length;
316 int maxlen;
317 int quote;
318 int nonnull;
319} o_string;
320#define NULL_O_STRING {NULL,0,0,0,0}
321/* used for initialization:
322 o_string foo = NULL_O_STRING; */
323
324/* I can almost use ordinary FILE *. Is open_memstream() universally
325 * available? Where is it documented? */
326struct in_str {
Heinrich Schuchardta52881e2023-05-02 04:34:09 +0200327 const unsigned char *p;
wdenkfe8c2802002-11-03 00:38:21 +0000328#ifndef __U_BOOT__
329 char peek_buf[2];
330#endif
331 int __promptme;
332 int promptmode;
333#ifndef __U_BOOT__
334 FILE *file;
335#endif
336 int (*get) (struct in_str *);
337 int (*peek) (struct in_str *);
338};
339#define b_getch(input) ((input)->get(input))
340#define b_peek(input) ((input)->peek(input))
341
342#ifndef __U_BOOT__
343#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
344
345struct built_in_command {
346 char *cmd; /* name */
347 char *descr; /* description */
348 int (*function) (struct child_prog *); /* function ptr */
349};
350#endif
351
Stefan Roesec23634d2008-08-19 14:57:55 +0200352/* define DEBUG_SHELL for debugging output (obviously ;-)) */
353#if 0
354#define DEBUG_SHELL
355#endif
356
wdenkfe8c2802002-11-03 00:38:21 +0000357/* This should be in utility.c */
358#ifdef DEBUG_SHELL
359#ifndef __U_BOOT__
360static void debug_printf(const char *format, ...)
361{
362 va_list args;
363 va_start(args, format);
364 vfprintf(stderr, format, args);
365 va_end(args);
366}
367#else
Stefan Roesec23634d2008-08-19 14:57:55 +0200368#define debug_printf(fmt,args...) printf (fmt ,##args)
wdenkfe8c2802002-11-03 00:38:21 +0000369#endif
370#else
371static inline void debug_printf(const char *format, ...) { }
372#endif
373#define final_printf debug_printf
374
375#ifdef __U_BOOT__
376static void syntax_err(void) {
377 printf("syntax error\n");
378}
379#else
380static void __syntax(char *file, int line) {
381 error_msg("syntax error %s:%d", file, line);
382}
383#define syntax() __syntax(__FILE__, __LINE__)
384#endif
385
386#ifdef __U_BOOT__
387static void *xmalloc(size_t size);
388static void *xrealloc(void *ptr, size_t size);
389#else
390/* Index of subroutines: */
391/* function prototypes for builtins */
392static int builtin_cd(struct child_prog *child);
393static int builtin_env(struct child_prog *child);
394static int builtin_eval(struct child_prog *child);
395static int builtin_exec(struct child_prog *child);
396static int builtin_exit(struct child_prog *child);
397static int builtin_export(struct child_prog *child);
398static int builtin_fg_bg(struct child_prog *child);
399static int builtin_help(struct child_prog *child);
400static int builtin_jobs(struct child_prog *child);
401static int builtin_pwd(struct child_prog *child);
402static int builtin_read(struct child_prog *child);
403static int builtin_set(struct child_prog *child);
404static int builtin_shift(struct child_prog *child);
405static int builtin_source(struct child_prog *child);
406static int builtin_umask(struct child_prog *child);
407static int builtin_unset(struct child_prog *child);
408static int builtin_not_written(struct child_prog *child);
409#endif
410/* o_string manipulation: */
411static int b_check_space(o_string *o, int len);
412static int b_addchr(o_string *o, int ch);
413static void b_reset(o_string *o);
414static int b_addqchr(o_string *o, int ch, int quote);
wdenk6203e402004-04-18 10:13:26 +0000415#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +0000416static int b_adduint(o_string *o, unsigned int i);
wdenk6203e402004-04-18 10:13:26 +0000417#endif
wdenkfe8c2802002-11-03 00:38:21 +0000418/* in_str manipulations: */
419static int static_get(struct in_str *i);
420static int static_peek(struct in_str *i);
421static int file_get(struct in_str *i);
422static int file_peek(struct in_str *i);
423#ifndef __U_BOOT__
424static void setup_file_in_str(struct in_str *i, FILE *f);
425#else
426static void setup_file_in_str(struct in_str *i);
427#endif
428static void setup_string_in_str(struct in_str *i, const char *s);
429#ifndef __U_BOOT__
430/* close_me manipulations: */
431static void mark_open(int fd);
432static void mark_closed(int fd);
wdenke7f34c62003-01-11 09:48:40 +0000433static void close_all(void);
wdenkfe8c2802002-11-03 00:38:21 +0000434#endif
435/* "run" the final data structures: */
436static char *indenter(int i);
437static int free_pipe_list(struct pipe *head, int indent);
438static int free_pipe(struct pipe *pi, int indent);
439/* really run the final data structures: */
440#ifndef __U_BOOT__
441static int setup_redirects(struct child_prog *prog, int squirrel[]);
442#endif
443static int run_list_real(struct pipe *pi);
444#ifndef __U_BOOT__
445static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
446#endif
447static int run_pipe_real(struct pipe *pi);
448/* extended glob support: */
449#ifndef __U_BOOT__
450static int globhack(const char *src, int flags, glob_t *pglob);
451static int glob_needed(const char *s);
452static int xglob(o_string *dest, int flags, glob_t *pglob);
453#endif
454/* variable assignment: */
455static int is_assignment(const char *s);
456/* data structure manipulation: */
457#ifndef __U_BOOT__
458static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
459#endif
460static void initialize_context(struct p_context *ctx);
461static int done_word(o_string *dest, struct p_context *ctx);
462static int done_command(struct p_context *ctx);
463static int done_pipe(struct p_context *ctx, pipe_style type);
464/* primary string parsing: */
465#ifndef __U_BOOT__
466static int redirect_dup_num(struct in_str *input);
467static int redirect_opt_num(o_string *o);
468static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
469static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
470#endif
471static char *lookup_param(char *src);
Stephen Warren60c38c92014-03-01 22:16:10 -0700472static char *make_string(char **inp, int *nonnull);
wdenkfe8c2802002-11-03 00:38:21 +0000473static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
474#ifndef __U_BOOT__
475static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
476#endif
477static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
478/* setup: */
479static int parse_stream_outer(struct in_str *inp, int flag);
480#ifndef __U_BOOT__
481static int parse_string_outer(const char *s, int flag);
482static int parse_file_outer(FILE *f);
483#endif
484#ifndef __U_BOOT__
485/* job management: */
486static int checkjobs(struct pipe* fg_pipe);
487static void insert_bg_job(struct pipe *pi);
488static void remove_bg_job(struct pipe *pi);
489#endif
490/* local variable support */
491static char **make_list_in(char **inp, char *name);
492static char *insert_var_value(char *inp);
Joe Hershberger38de0b62012-08-17 10:26:30 +0000493static char *insert_var_value_sub(char *inp, int tag_subst);
wdenkfe8c2802002-11-03 00:38:21 +0000494
495#ifndef __U_BOOT__
496/* Table of built-in functions. They can be forked or not, depending on
497 * context: within pipes, they fork. As simple commands, they do not.
498 * When used in non-forking context, they can change global variables
499 * in the parent shell process. If forked, of course they can not.
500 * For example, 'unset foo | whatever' will parse and run, but foo will
501 * still be set at the end. */
502static struct built_in_command bltins[] = {
503 {"bg", "Resume a job in the background", builtin_fg_bg},
504 {"break", "Exit for, while or until loop", builtin_not_written},
505 {"cd", "Change working directory", builtin_cd},
506 {"continue", "Continue for, while or until loop", builtin_not_written},
507 {"env", "Print all environment variables", builtin_env},
508 {"eval", "Construct and run shell command", builtin_eval},
509 {"exec", "Exec command, replacing this shell with the exec'd process",
510 builtin_exec},
511 {"exit", "Exit from shell()", builtin_exit},
512 {"export", "Set environment variable", builtin_export},
513 {"fg", "Bring job into the foreground", builtin_fg_bg},
514 {"jobs", "Lists the active jobs", builtin_jobs},
515 {"pwd", "Print current directory", builtin_pwd},
516 {"read", "Input environment variable", builtin_read},
517 {"return", "Return from a function", builtin_not_written},
518 {"set", "Set/unset shell local variables", builtin_set},
519 {"shift", "Shift positional parameters", builtin_shift},
520 {"trap", "Trap signals", builtin_not_written},
521 {"ulimit","Controls resource limits", builtin_not_written},
522 {"umask","Sets file creation mask", builtin_umask},
523 {"unset", "Unset environment variable", builtin_unset},
524 {".", "Source-in and run commands in a file", builtin_source},
525 {"help", "List shell built-in commands", builtin_help},
526 {NULL, NULL, NULL}
527};
528
529static const char *set_cwd(void)
530{
531 if(cwd==unknown)
532 cwd = NULL; /* xgetcwd(arg) called free(arg) */
533 cwd = xgetcwd((char *)cwd);
534 if (!cwd)
535 cwd = unknown;
536 return cwd;
537}
538
539/* built-in 'eval' handler */
540static int builtin_eval(struct child_prog *child)
541{
542 char *str = NULL;
543 int rcode = EXIT_SUCCESS;
544
545 if (child->argv[1]) {
546 str = make_string(child->argv + 1);
547 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
548 FLAG_PARSE_SEMICOLON);
549 free(str);
550 rcode = last_return_code;
551 }
552 return rcode;
553}
554
555/* built-in 'cd <path>' handler */
556static int builtin_cd(struct child_prog *child)
557{
558 char *newdir;
559 if (child->argv[1] == NULL)
Simon Glass64b723f2017-08-03 12:22:12 -0600560 newdir = env_get("HOME");
wdenkfe8c2802002-11-03 00:38:21 +0000561 else
562 newdir = child->argv[1];
563 if (chdir(newdir)) {
564 printf("cd: %s: %s\n", newdir, strerror(errno));
565 return EXIT_FAILURE;
566 }
567 set_cwd();
568 return EXIT_SUCCESS;
569}
570
571/* built-in 'env' handler */
572static int builtin_env(struct child_prog *dummy)
573{
574 char **e = environ;
575 if (e == NULL) return EXIT_FAILURE;
576 for (; *e; e++) {
577 puts(*e);
578 }
579 return EXIT_SUCCESS;
580}
581
582/* built-in 'exec' handler */
583static int builtin_exec(struct child_prog *child)
584{
585 if (child->argv[1] == NULL)
586 return EXIT_SUCCESS; /* Really? */
587 child->argv++;
588 pseudo_exec(child);
589 /* never returns */
590}
591
592/* built-in 'exit' handler */
593static int builtin_exit(struct child_prog *child)
594{
595 if (child->argv[1] == NULL)
596 exit(last_return_code);
597 exit (atoi(child->argv[1]));
598}
599
600/* built-in 'export VAR=value' handler */
601static int builtin_export(struct child_prog *child)
602{
603 int res = 0;
604 char *name = child->argv[1];
605
606 if (name == NULL) {
607 return (builtin_env(child));
608 }
609
610 name = strdup(name);
611
612 if(name) {
613 char *value = strchr(name, '=');
614
615 if (!value) {
616 char *tmp;
617 /* They are exporting something without an =VALUE */
618
619 value = get_local_var(name);
620 if (value) {
621 size_t ln = strlen(name);
622
623 tmp = realloc(name, ln+strlen(value)+2);
624 if(tmp==NULL)
625 res = -1;
626 else {
627 sprintf(tmp+ln, "=%s", value);
628 name = tmp;
629 }
630 } else {
631 /* bash does not return an error when trying to export
632 * an undefined variable. Do likewise. */
633 res = 1;
634 }
635 }
636 }
637 if (res<0)
638 perror_msg("export");
639 else if(res==0)
640 res = set_local_var(name, 1);
641 else
642 res = 0;
643 free(name);
644 return res;
645}
646
647/* built-in 'fg' and 'bg' handler */
648static int builtin_fg_bg(struct child_prog *child)
649{
650 int i, jobnum;
651 struct pipe *pi=NULL;
652
653 if (!interactive)
654 return EXIT_FAILURE;
655 /* If they gave us no args, assume they want the last backgrounded task */
656 if (!child->argv[1]) {
657 for (pi = job_list; pi; pi = pi->next) {
658 if (pi->jobid == last_jobid) {
659 break;
660 }
661 }
662 if (!pi) {
663 error_msg("%s: no current job", child->argv[0]);
664 return EXIT_FAILURE;
665 }
666 } else {
667 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
668 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
669 return EXIT_FAILURE;
670 }
671 for (pi = job_list; pi; pi = pi->next) {
672 if (pi->jobid == jobnum) {
673 break;
674 }
675 }
676 if (!pi) {
677 error_msg("%s: %d: no such job", child->argv[0], jobnum);
678 return EXIT_FAILURE;
679 }
680 }
681
682 if (*child->argv[0] == 'f') {
683 /* Put the job into the foreground. */
684 tcsetpgrp(shell_terminal, pi->pgrp);
685 }
686
687 /* Restart the processes in the job */
688 for (i = 0; i < pi->num_progs; i++)
689 pi->progs[i].is_stopped = 0;
690
691 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
692 if (i == ESRCH) {
693 remove_bg_job(pi);
694 } else {
695 perror_msg("kill (SIGCONT)");
696 }
697 }
698
699 pi->stopped_progs = 0;
700 return EXIT_SUCCESS;
701}
702
703/* built-in 'help' handler */
704static int builtin_help(struct child_prog *dummy)
705{
706 struct built_in_command *x;
707
708 printf("\nBuilt-in commands:\n");
709 printf("-------------------\n");
710 for (x = bltins; x->cmd; x++) {
711 if (x->descr==NULL)
712 continue;
713 printf("%s\t%s\n", x->cmd, x->descr);
714 }
715 printf("\n\n");
716 return EXIT_SUCCESS;
717}
718
719/* built-in 'jobs' handler */
720static int builtin_jobs(struct child_prog *child)
721{
722 struct pipe *job;
723 char *status_string;
724
725 for (job = job_list; job; job = job->next) {
726 if (job->running_progs == job->stopped_progs)
727 status_string = "Stopped";
728 else
729 status_string = "Running";
730
731 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
732 }
733 return EXIT_SUCCESS;
734}
735
736
737/* built-in 'pwd' handler */
738static int builtin_pwd(struct child_prog *dummy)
739{
740 puts(set_cwd());
741 return EXIT_SUCCESS;
742}
743
744/* built-in 'read VAR' handler */
745static int builtin_read(struct child_prog *child)
746{
747 int res;
748
749 if (child->argv[1]) {
750 char string[BUFSIZ];
751 char *var = 0;
752
753 string[0] = 0; /* In case stdin has only EOF */
754 /* read string */
755 fgets(string, sizeof(string), stdin);
756 chomp(string);
757 var = malloc(strlen(child->argv[1])+strlen(string)+2);
758 if(var) {
759 sprintf(var, "%s=%s", child->argv[1], string);
760 res = set_local_var(var, 0);
761 } else
762 res = -1;
763 if (res)
764 fprintf(stderr, "read: %m\n");
765 free(var); /* So not move up to avoid breaking errno */
766 return res;
767 } else {
768 do res=getchar(); while(res!='\n' && res!=EOF);
769 return 0;
770 }
771}
772
773/* built-in 'set VAR=value' handler */
774static int builtin_set(struct child_prog *child)
775{
776 char *temp = child->argv[1];
777 struct variables *e;
778
779 if (temp == NULL)
780 for(e = top_vars; e; e=e->next)
781 printf("%s=%s\n", e->name, e->value);
782 else
783 set_local_var(temp, 0);
784
785 return EXIT_SUCCESS;
786}
787
788
789/* Built-in 'shift' handler */
790static int builtin_shift(struct child_prog *child)
791{
792 int n=1;
793 if (child->argv[1]) {
794 n=atoi(child->argv[1]);
795 }
796 if (n>=0 && n<global_argc) {
797 /* XXX This probably breaks $0 */
798 global_argc -= n;
799 global_argv += n;
800 return EXIT_SUCCESS;
801 } else {
802 return EXIT_FAILURE;
803 }
804}
805
806/* Built-in '.' handler (read-in and execute commands from file) */
807static int builtin_source(struct child_prog *child)
808{
809 FILE *input;
810 int status;
811
812 if (child->argv[1] == NULL)
813 return EXIT_FAILURE;
814
815 /* XXX search through $PATH is missing */
816 input = fopen(child->argv[1], "r");
817 if (!input) {
818 error_msg("Couldn't open file '%s'", child->argv[1]);
819 return EXIT_FAILURE;
820 }
821
822 /* Now run the file */
823 /* XXX argv and argc are broken; need to save old global_argv
824 * (pointer only is OK!) on this stack frame,
825 * set global_argv=child->argv+1, recurse, and restore. */
826 mark_open(fileno(input));
827 status = parse_file_outer(input);
828 mark_closed(fileno(input));
829 fclose(input);
830 return (status);
831}
832
833static int builtin_umask(struct child_prog *child)
834{
835 mode_t new_umask;
836 const char *arg = child->argv[1];
837 char *end;
838 if (arg) {
839 new_umask=strtoul(arg, &end, 8);
840 if (*end!='\0' || end == arg) {
841 return EXIT_FAILURE;
842 }
843 } else {
844 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
845 }
846 umask(new_umask);
847 return EXIT_SUCCESS;
848}
849
850/* built-in 'unset VAR' handler */
851static int builtin_unset(struct child_prog *child)
852{
853 /* bash returned already true */
854 unset_local_var(child->argv[1]);
855 return EXIT_SUCCESS;
856}
857
858static int builtin_not_written(struct child_prog *child)
859{
860 printf("builtin_%s not written\n",child->argv[0]);
861 return EXIT_FAILURE;
862}
863#endif
864
865static int b_check_space(o_string *o, int len)
866{
867 /* It would be easy to drop a more restrictive policy
868 * in here, such as setting a maximum string length */
869 if (o->length + len > o->maxlen) {
870 char *old_data = o->data;
871 /* assert (data == NULL || o->maxlen != 0); */
872 o->maxlen += max(2*len, B_CHUNK);
873 o->data = realloc(o->data, 1 + o->maxlen);
874 if (o->data == NULL) {
875 free(old_data);
876 }
877 }
878 return o->data == NULL;
879}
880
881static int b_addchr(o_string *o, int ch)
882{
883 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
884 if (b_check_space(o, 1)) return B_NOSPAC;
885 o->data[o->length] = ch;
886 o->length++;
887 o->data[o->length] = '\0';
888 return 0;
889}
890
891static void b_reset(o_string *o)
892{
893 o->length = 0;
894 o->nonnull = 0;
895 if (o->data != NULL) *o->data = '\0';
896}
897
898static void b_free(o_string *o)
899{
900 b_reset(o);
wdenke7f34c62003-01-11 09:48:40 +0000901 free(o->data);
wdenkfe8c2802002-11-03 00:38:21 +0000902 o->data = NULL;
903 o->maxlen = 0;
904}
905
906/* My analysis of quoting semantics tells me that state information
907 * is associated with a destination, not a source.
908 */
909static int b_addqchr(o_string *o, int ch, int quote)
910{
911 if (quote && strchr("*?[\\",ch)) {
912 int rc;
913 rc = b_addchr(o, '\\');
914 if (rc) return rc;
915 }
916 return b_addchr(o, ch);
917}
918
wdenk6203e402004-04-18 10:13:26 +0000919#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +0000920static int b_adduint(o_string *o, unsigned int i)
921{
922 int r;
923 char *p = simple_itoa(i);
924 /* no escape checking necessary */
925 do r=b_addchr(o, *p++); while (r==0 && *p);
926 return r;
927}
wdenk6203e402004-04-18 10:13:26 +0000928#endif
wdenkfe8c2802002-11-03 00:38:21 +0000929
930static int static_get(struct in_str *i)
931{
Wolfgang Denkdc770c72008-07-14 15:19:07 +0200932 int ch = *i->p++;
wdenkfe8c2802002-11-03 00:38:21 +0000933 if (ch=='\0') return EOF;
934 return ch;
935}
936
937static int static_peek(struct in_str *i)
938{
939 return *i->p;
940}
941
942#ifndef __U_BOOT__
943static inline void cmdedit_set_initial_prompt(void)
944{
wdenke7f34c62003-01-11 09:48:40 +0000945#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
wdenkfe8c2802002-11-03 00:38:21 +0000946 PS1 = NULL;
947#else
Simon Glass64b723f2017-08-03 12:22:12 -0600948 PS1 = env_get("PS1");
wdenkfe8c2802002-11-03 00:38:21 +0000949 if(PS1==0)
950 PS1 = "\\w \\$ ";
951#endif
952}
953
954static inline void setup_prompt_string(int promptmode, char **prompt_str)
955{
956 debug_printf("setup_prompt_string %d ",promptmode);
wdenke7f34c62003-01-11 09:48:40 +0000957#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
wdenkfe8c2802002-11-03 00:38:21 +0000958 /* Set up the prompt */
959 if (promptmode == 1) {
wdenke7f34c62003-01-11 09:48:40 +0000960 free(PS1);
wdenkfe8c2802002-11-03 00:38:21 +0000961 PS1=xmalloc(strlen(cwd)+4);
962 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
963 *prompt_str = PS1;
964 } else {
965 *prompt_str = PS2;
966 }
967#else
968 *prompt_str = (promptmode==1)? PS1 : PS2;
969#endif
970 debug_printf("result %s\n",*prompt_str);
971}
972#endif
973
Marek Vasut755e12d2016-01-27 04:47:54 +0100974#ifdef __U_BOOT__
975static int uboot_cli_readline(struct in_str *i)
976{
977 char *prompt;
Marek Vasut734fb042016-01-27 04:47:55 +0100978 char __maybe_unused *ps_prompt = NULL;
Marek Vasut755e12d2016-01-27 04:47:54 +0100979
980 if (i->promptmode == 1)
981 prompt = CONFIG_SYS_PROMPT;
982 else
983 prompt = CONFIG_SYS_PROMPT_HUSH_PS2;
984
Marek Vasut734fb042016-01-27 04:47:55 +0100985#ifdef CONFIG_CMDLINE_PS_SUPPORT
986 if (i->promptmode == 1)
Simon Glass64b723f2017-08-03 12:22:12 -0600987 ps_prompt = env_get("PS1");
Marek Vasut734fb042016-01-27 04:47:55 +0100988 else
Simon Glass64b723f2017-08-03 12:22:12 -0600989 ps_prompt = env_get("PS2");
Marek Vasut734fb042016-01-27 04:47:55 +0100990 if (ps_prompt)
991 prompt = ps_prompt;
992#endif
993
Marek Vasut755e12d2016-01-27 04:47:54 +0100994 return cli_readline(prompt);
995}
996#endif
997
wdenkfe8c2802002-11-03 00:38:21 +0000998static void get_user_input(struct in_str *i)
999{
1000#ifndef __U_BOOT__
1001 char *prompt_str;
1002 static char the_command[BUFSIZ];
1003
1004 setup_prompt_string(i->promptmode, &prompt_str);
wdenke7f34c62003-01-11 09:48:40 +00001005#ifdef CONFIG_FEATURE_COMMAND_EDITING
wdenkfe8c2802002-11-03 00:38:21 +00001006 /*
1007 ** enable command line editing only while a command line
1008 ** is actually being read; otherwise, we'll end up bequeathing
1009 ** atexit() handlers and other unwanted stuff to our
1010 ** child processes (rob@sysgo.de)
1011 */
1012 cmdedit_read_input(prompt_str, the_command);
1013#else
1014 fputs(prompt_str, stdout);
1015 fflush(stdout);
1016 the_command[0]=fgetc(i->file);
1017 the_command[1]='\0';
1018#endif
1019 fflush(stdout);
1020 i->p = the_command;
1021#else
wdenkfe8c2802002-11-03 00:38:21 +00001022 int n;
Kristian Otnes2a262cd2014-04-25 15:35:43 +02001023 static char the_command[CONFIG_SYS_CBSIZE + 1];
wdenkfe8c2802002-11-03 00:38:21 +00001024
Simon Glass09007c42014-04-10 20:01:31 -06001025 bootretry_reset_cmd_timeout();
wdenkfe8c2802002-11-03 00:38:21 +00001026 i->__promptme = 1;
Marek Vasut755e12d2016-01-27 04:47:54 +01001027 n = uboot_cli_readline(i);
1028
Wolfgang Denk2b7976a2005-08-12 23:34:51 +02001029#ifdef CONFIG_BOOT_RETRY_TIME
1030 if (n == -2) {
1031 puts("\nTimeout waiting for command\n");
1032# ifdef CONFIG_RESET_TO_RETRY
1033 do_reset(NULL, 0, 0, NULL);
1034# else
1035# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1036# endif
1037 }
1038#endif
wdenkfe8c2802002-11-03 00:38:21 +00001039 if (n == -1 ) {
1040 flag_repeat = 0;
1041 i->__promptme = 0;
1042 }
1043 n = strlen(console_buffer);
1044 console_buffer[n] = '\n';
1045 console_buffer[n+1]= '\0';
1046 if (had_ctrlc()) flag_repeat = 0;
1047 clear_ctrlc();
1048 do_repeat = 0;
1049 if (i->promptmode == 1) {
1050 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1051 strcpy(the_command,console_buffer);
1052 }
1053 else {
1054 if (console_buffer[0] != '\n') {
1055 strcpy(the_command,console_buffer);
1056 flag_repeat = 1;
1057 }
1058 else {
1059 do_repeat = 1;
1060 }
1061 }
1062 i->p = the_command;
1063 }
1064 else {
wdenk57b2d802003-06-27 21:31:46 +00001065 if (console_buffer[0] != '\n') {
1066 if (strlen(the_command) + strlen(console_buffer)
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02001067 < CONFIG_SYS_CBSIZE) {
wdenk57b2d802003-06-27 21:31:46 +00001068 n = strlen(the_command);
1069 the_command[n-1] = ' ';
1070 strcpy(&the_command[n],console_buffer);
wdenkfe8c2802002-11-03 00:38:21 +00001071 }
1072 else {
1073 the_command[0] = '\n';
1074 the_command[1] = '\0';
1075 flag_repeat = 0;
1076 }
1077 }
1078 if (i->__promptme == 0) {
1079 the_command[0] = '\n';
1080 the_command[1] = '\0';
1081 }
1082 i->p = console_buffer;
1083 }
1084#endif
1085}
1086
1087/* This is the magic location that prints prompts
1088 * and gets data back from the user */
1089static int file_get(struct in_str *i)
1090{
1091 int ch;
1092
1093 ch = 0;
1094 /* If there is data waiting, eat it up */
1095 if (i->p && *i->p) {
Wolfgang Denkdc770c72008-07-14 15:19:07 +02001096 ch = *i->p++;
wdenkfe8c2802002-11-03 00:38:21 +00001097 } else {
1098 /* need to double check i->file because we might be doing something
1099 * more complicated by now, like sourcing or substituting. */
1100#ifndef __U_BOOT__
1101 if (i->__promptme && interactive && i->file == stdin) {
1102 while(! i->p || (interactive && strlen(i->p)==0) ) {
1103#else
1104 while(! i->p || strlen(i->p)==0 ) {
1105#endif
1106 get_user_input(i);
1107 }
1108 i->promptmode=2;
1109#ifndef __U_BOOT__
1110 i->__promptme = 0;
1111#endif
1112 if (i->p && *i->p) {
Wolfgang Denkdc770c72008-07-14 15:19:07 +02001113 ch = *i->p++;
wdenkfe8c2802002-11-03 00:38:21 +00001114 }
1115#ifndef __U_BOOT__
1116 } else {
1117 ch = fgetc(i->file);
1118 }
1119
1120#endif
1121 debug_printf("b_getch: got a %d\n", ch);
1122 }
1123#ifndef __U_BOOT__
1124 if (ch == '\n') i->__promptme=1;
1125#endif
1126 return ch;
1127}
1128
1129/* All the callers guarantee this routine will never be
1130 * used right after a newline, so prompting is not needed.
1131 */
1132static int file_peek(struct in_str *i)
1133{
1134#ifndef __U_BOOT__
1135 if (i->p && *i->p) {
1136#endif
1137 return *i->p;
1138#ifndef __U_BOOT__
1139 } else {
1140 i->peek_buf[0] = fgetc(i->file);
1141 i->peek_buf[1] = '\0';
1142 i->p = i->peek_buf;
1143 debug_printf("b_peek: got a %d\n", *i->p);
1144 return *i->p;
1145 }
1146#endif
1147}
1148
1149#ifndef __U_BOOT__
1150static void setup_file_in_str(struct in_str *i, FILE *f)
1151#else
1152static void setup_file_in_str(struct in_str *i)
1153#endif
1154{
1155 i->peek = file_peek;
1156 i->get = file_get;
1157 i->__promptme=1;
1158 i->promptmode=1;
1159#ifndef __U_BOOT__
1160 i->file = f;
1161#endif
1162 i->p = NULL;
1163}
1164
1165static void setup_string_in_str(struct in_str *i, const char *s)
1166{
1167 i->peek = static_peek;
1168 i->get = static_get;
1169 i->__promptme=1;
1170 i->promptmode=1;
1171 i->p = s;
1172}
1173
1174#ifndef __U_BOOT__
1175static void mark_open(int fd)
1176{
1177 struct close_me *new = xmalloc(sizeof(struct close_me));
1178 new->fd = fd;
1179 new->next = close_me_head;
1180 close_me_head = new;
1181}
1182
1183static void mark_closed(int fd)
1184{
1185 struct close_me *tmp;
1186 if (close_me_head == NULL || close_me_head->fd != fd)
1187 error_msg_and_die("corrupt close_me");
1188 tmp = close_me_head;
1189 close_me_head = close_me_head->next;
1190 free(tmp);
1191}
1192
wdenke7f34c62003-01-11 09:48:40 +00001193static void close_all(void)
wdenkfe8c2802002-11-03 00:38:21 +00001194{
1195 struct close_me *c;
1196 for (c=close_me_head; c; c=c->next) {
1197 close(c->fd);
1198 }
1199 close_me_head = NULL;
1200}
1201
1202/* squirrel != NULL means we squirrel away copies of stdin, stdout,
1203 * and stderr if they are redirected. */
1204static int setup_redirects(struct child_prog *prog, int squirrel[])
1205{
1206 int openfd, mode;
1207 struct redir_struct *redir;
1208
1209 for (redir=prog->redirects; redir; redir=redir->next) {
1210 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1211 /* something went wrong in the parse. Pretend it didn't happen */
1212 continue;
1213 }
1214 if (redir->dup == -1) {
1215 mode=redir_table[redir->type].mode;
1216 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1217 if (openfd < 0) {
1218 /* this could get lost if stderr has been redirected, but
1219 bash and ash both lose it as well (though zsh doesn't!) */
1220 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1221 return 1;
1222 }
1223 } else {
1224 openfd = redir->dup;
1225 }
1226
1227 if (openfd != redir->fd) {
1228 if (squirrel && redir->fd < 3) {
1229 squirrel[redir->fd] = dup(redir->fd);
1230 }
1231 if (openfd == -3) {
1232 close(openfd);
1233 } else {
1234 dup2(openfd, redir->fd);
1235 if (redir->dup == -1)
1236 close (openfd);
1237 }
1238 }
1239 }
1240 return 0;
1241}
1242
1243static void restore_redirects(int squirrel[])
1244{
1245 int i, fd;
1246 for (i=0; i<3; i++) {
1247 fd = squirrel[i];
1248 if (fd != -1) {
1249 /* No error checking. I sure wouldn't know what
1250 * to do with an error if I found one! */
1251 dup2(fd, i);
1252 close(fd);
1253 }
1254 }
1255}
1256
1257/* never returns */
1258/* XXX no exit() here. If you don't exec, use _exit instead.
1259 * The at_exit handlers apparently confuse the calling process,
1260 * in particular stdin handling. Not sure why? */
1261static void pseudo_exec(struct child_prog *child)
1262{
1263 int i, rcode;
1264 char *p;
1265 struct built_in_command *x;
1266 if (child->argv) {
1267 for (i=0; is_assignment(child->argv[i]); i++) {
1268 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1269 p = insert_var_value(child->argv[i]);
1270 putenv(strdup(p));
1271 if (p != child->argv[i]) free(p);
1272 }
1273 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
wdenk57b2d802003-06-27 21:31:46 +00001274 to exit, and therefore don't need to keep data
1275 structures consistent for free() use. */
wdenkfe8c2802002-11-03 00:38:21 +00001276 /* If a variable is assigned in a forest, and nobody listens,
1277 * was it ever really set?
1278 */
1279 if (child->argv[0] == NULL) {
1280 _exit(EXIT_SUCCESS);
1281 }
1282
1283 /*
1284 * Check if the command matches any of the builtins.
1285 * Depending on context, this might be redundant. But it's
1286 * easier to waste a few CPU cycles than it is to figure out
1287 * if this is one of those cases.
1288 */
1289 for (x = bltins; x->cmd; x++) {
1290 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1291 debug_printf("builtin exec %s\n", child->argv[0]);
1292 rcode = x->function(child);
1293 fflush(stdout);
1294 _exit(rcode);
1295 }
1296 }
1297
1298 /* Check if the command matches any busybox internal commands
1299 * ("applets") here.
1300 * FIXME: This feature is not 100% safe, since
1301 * BusyBox is not fully reentrant, so we have no guarantee the things
1302 * from the .bss are still zeroed, or that things from .data are still
1303 * at their defaults. We could exec ourself from /proc/self/exe, but I
1304 * really dislike relying on /proc for things. We could exec ourself
1305 * from global_argv[0], but if we are in a chroot, we may not be able
1306 * to find ourself... */
wdenke7f34c62003-01-11 09:48:40 +00001307#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
wdenkfe8c2802002-11-03 00:38:21 +00001308 {
1309 int argc_l;
1310 char** argv_l=child->argv;
1311 char *name = child->argv[0];
1312
wdenke7f34c62003-01-11 09:48:40 +00001313#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
wdenkfe8c2802002-11-03 00:38:21 +00001314 /* Following discussions from November 2000 on the busybox mailing
1315 * list, the default configuration, (without
1316 * get_last_path_component()) lets the user force use of an
1317 * external command by specifying the full (with slashes) filename.
wdenke7f34c62003-01-11 09:48:40 +00001318 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
wdenkfe8c2802002-11-03 00:38:21 +00001319 * _aways_ override external commands, so if you want to run
1320 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1321 * filesystem and is _not_ busybox. Some systems may want this,
1322 * most do not. */
1323 name = get_last_path_component(name);
1324#endif
1325 /* Count argc for use in a second... */
1326 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1327 optind = 1;
1328 debug_printf("running applet %s\n", name);
1329 run_applet_by_name(name, argc_l, child->argv);
1330 }
1331#endif
1332 debug_printf("exec of %s\n",child->argv[0]);
1333 execvp(child->argv[0],child->argv);
1334 perror_msg("couldn't exec: %s",child->argv[0]);
1335 _exit(1);
1336 } else if (child->group) {
1337 debug_printf("runtime nesting to group\n");
1338 interactive=0; /* crucial!!!! */
1339 rcode = run_list_real(child->group);
1340 /* OK to leak memory by not calling free_pipe_list,
1341 * since this process is about to exit */
1342 _exit(rcode);
1343 } else {
1344 /* Can happen. See what bash does with ">foo" by itself. */
1345 debug_printf("trying to pseudo_exec null command\n");
1346 _exit(EXIT_SUCCESS);
1347 }
1348}
1349
1350static void insert_bg_job(struct pipe *pi)
1351{
1352 struct pipe *thejob;
1353
1354 /* Linear search for the ID of the job to use */
1355 pi->jobid = 1;
1356 for (thejob = job_list; thejob; thejob = thejob->next)
1357 if (thejob->jobid >= pi->jobid)
1358 pi->jobid = thejob->jobid + 1;
1359
1360 /* add thejob to the list of running jobs */
1361 if (!job_list) {
1362 thejob = job_list = xmalloc(sizeof(*thejob));
1363 } else {
1364 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1365 thejob->next = xmalloc(sizeof(*thejob));
1366 thejob = thejob->next;
1367 }
1368
1369 /* physically copy the struct job */
1370 memcpy(thejob, pi, sizeof(struct pipe));
1371 thejob->next = NULL;
1372 thejob->running_progs = thejob->num_progs;
1373 thejob->stopped_progs = 0;
1374 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1375
1376 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1377 {
1378 char *bar=thejob->text;
1379 char **foo=pi->progs[0].argv;
1380 while(foo && *foo) {
1381 bar += sprintf(bar, "%s ", *foo++);
1382 }
1383 }
1384
1385 /* we don't wait for background thejobs to return -- append it
1386 to the list of backgrounded thejobs and leave it alone */
1387 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1388 last_bg_pid = thejob->progs[0].pid;
1389 last_jobid = thejob->jobid;
1390}
1391
1392/* remove a backgrounded job */
1393static void remove_bg_job(struct pipe *pi)
1394{
1395 struct pipe *prev_pipe;
1396
1397 if (pi == job_list) {
1398 job_list = pi->next;
1399 } else {
1400 prev_pipe = job_list;
1401 while (prev_pipe->next != pi)
1402 prev_pipe = prev_pipe->next;
1403 prev_pipe->next = pi->next;
1404 }
1405 if (job_list)
1406 last_jobid = job_list->jobid;
1407 else
1408 last_jobid = 0;
1409
1410 pi->stopped_progs = 0;
1411 free_pipe(pi, 0);
1412 free(pi);
1413}
1414
1415/* Checks to see if any processes have exited -- if they
1416 have, figure out why and see if a job has completed */
1417static int checkjobs(struct pipe* fg_pipe)
1418{
1419 int attributes;
1420 int status;
1421 int prognum = 0;
1422 struct pipe *pi;
1423 pid_t childpid;
1424
1425 attributes = WUNTRACED;
1426 if (fg_pipe==NULL) {
1427 attributes |= WNOHANG;
1428 }
1429
1430 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1431 if (fg_pipe) {
1432 int i, rcode = 0;
1433 for (i=0; i < fg_pipe->num_progs; i++) {
1434 if (fg_pipe->progs[i].pid == childpid) {
1435 if (i==fg_pipe->num_progs-1)
1436 rcode=WEXITSTATUS(status);
1437 (fg_pipe->num_progs)--;
1438 return(rcode);
1439 }
1440 }
1441 }
1442
1443 for (pi = job_list; pi; pi = pi->next) {
1444 prognum = 0;
1445 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1446 prognum++;
1447 }
1448 if (prognum < pi->num_progs)
1449 break;
1450 }
1451
1452 if(pi==NULL) {
1453 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1454 continue;
1455 }
1456
1457 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1458 /* child exited */
1459 pi->running_progs--;
1460 pi->progs[prognum].pid = 0;
1461
1462 if (!pi->running_progs) {
1463 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1464 remove_bg_job(pi);
1465 }
1466 } else {
1467 /* child stopped */
1468 pi->stopped_progs++;
1469 pi->progs[prognum].is_stopped = 1;
1470
1471#if 0
1472 /* Printing this stuff is a pain, since it tends to
1473 * overwrite the prompt an inconveinient moments. So
1474 * don't do that. */
1475 if (pi->stopped_progs == pi->num_progs) {
1476 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1477 }
1478#endif
1479 }
1480 }
1481
1482 if (childpid == -1 && errno != ECHILD)
1483 perror_msg("waitpid");
1484
1485 /* move the shell to the foreground */
1486 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1487 /* perror_msg("tcsetpgrp-2"); */
1488 return -1;
1489}
1490
1491/* Figure out our controlling tty, checking in order stderr,
1492 * stdin, and stdout. If check_pgrp is set, also check that
1493 * we belong to the foreground process group associated with
1494 * that tty. The value of shell_terminal is needed in order to call
1495 * tcsetpgrp(shell_terminal, ...); */
1496void controlling_tty(int check_pgrp)
1497{
1498 pid_t curpgrp;
1499
1500 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1501 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1502 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1503 goto shell_terminal_error;
1504
1505 if (check_pgrp && curpgrp != getpgid(0))
1506 goto shell_terminal_error;
1507
1508 return;
1509
1510shell_terminal_error:
1511 shell_terminal = -1;
1512 return;
1513}
1514#endif
1515
1516/* run_pipe_real() starts all the jobs, but doesn't wait for anything
1517 * to finish. See checkjobs().
1518 *
1519 * return code is normally -1, when the caller has to wait for children
1520 * to finish to determine the exit status of the pipe. If the pipe
1521 * is a simple builtin command, however, the action is done by the
1522 * time run_pipe_real returns, and the exit code is provided as the
1523 * return value.
1524 *
1525 * The input of the pipe is always stdin, the output is always
1526 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1527 * because it tries to avoid running the command substitution in
1528 * subshell, when that is in fact necessary. The subshell process
1529 * now has its stdout directed to the input of the appropriate pipe,
1530 * so this routine is noticeably simpler.
1531 */
1532static int run_pipe_real(struct pipe *pi)
1533{
1534 int i;
1535#ifndef __U_BOOT__
1536 int nextin, nextout;
1537 int pipefds[2]; /* pipefds[0] is for reading */
1538 struct child_prog *child;
1539 struct built_in_command *x;
1540 char *p;
wdenke7f34c62003-01-11 09:48:40 +00001541# if __GNUC__
1542 /* Avoid longjmp clobbering */
1543 (void) &i;
1544 (void) &nextin;
1545 (void) &nextout;
1546 (void) &child;
1547# endif
wdenkfe8c2802002-11-03 00:38:21 +00001548#else
1549 int nextin;
1550 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1551 struct child_prog *child;
wdenkfe8c2802002-11-03 00:38:21 +00001552 char *p;
wdenke7f34c62003-01-11 09:48:40 +00001553# if __GNUC__
1554 /* Avoid longjmp clobbering */
1555 (void) &i;
1556 (void) &nextin;
1557 (void) &child;
1558# endif
1559#endif /* __U_BOOT__ */
wdenkfe8c2802002-11-03 00:38:21 +00001560
1561 nextin = 0;
1562#ifndef __U_BOOT__
1563 pi->pgrp = -1;
1564#endif
1565
1566 /* Check if this is a simple builtin (not part of a pipe).
1567 * Builtins within pipes have to fork anyway, and are handled in
1568 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1569 */
1570 if (pi->num_progs == 1) child = & (pi->progs[0]);
1571#ifndef __U_BOOT__
1572 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1573 int squirrel[] = {-1, -1, -1};
1574 int rcode;
1575 debug_printf("non-subshell grouping\n");
1576 setup_redirects(child, squirrel);
1577 /* XXX could we merge code with following builtin case,
1578 * by creating a pseudo builtin that calls run_list_real? */
1579 rcode = run_list_real(child->group);
1580 restore_redirects(squirrel);
1581#else
1582 if (pi->num_progs == 1 && child->group) {
1583 int rcode;
1584 debug_printf("non-subshell grouping\n");
1585 rcode = run_list_real(child->group);
1586#endif
1587 return rcode;
1588 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1589 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1590 if (i!=0 && child->argv[i]==NULL) {
1591 /* assignments, but no command: set the local environment */
1592 for (i=0; child->argv[i]!=NULL; i++) {
1593
1594 /* Ok, this case is tricky. We have to decide if this is a
1595 * local variable, or an already exported variable. If it is
1596 * already exported, we have to export the new value. If it is
1597 * not exported, we need only set this as a local variable.
1598 * This junk is all to decide whether or not to export this
1599 * variable. */
1600 int export_me=0;
1601 char *name, *value;
1602 name = xstrdup(child->argv[i]);
1603 debug_printf("Local environment set: %s\n", name);
1604 value = strchr(name, '=');
1605 if (value)
1606 *value=0;
1607#ifndef __U_BOOT__
1608 if ( get_local_var(name)) {
1609 export_me=1;
1610 }
1611#endif
1612 free(name);
1613 p = insert_var_value(child->argv[i]);
1614 set_local_var(p, export_me);
1615 if (p != child->argv[i]) free(p);
1616 }
1617 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1618 }
1619 for (i = 0; is_assignment(child->argv[i]); i++) {
1620 p = insert_var_value(child->argv[i]);
1621#ifndef __U_BOOT__
1622 putenv(strdup(p));
1623#else
1624 set_local_var(p, 0);
1625#endif
1626 if (p != child->argv[i]) {
1627 child->sp--;
1628 free(p);
1629 }
1630 }
1631 if (child->sp) {
1632 char * str = NULL;
1633
Stephen Warren60c38c92014-03-01 22:16:10 -07001634 str = make_string(child->argv + i,
1635 child->argv_nonnull + i);
wdenkfe8c2802002-11-03 00:38:21 +00001636 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1637 free(str);
1638 return last_return_code;
1639 }
1640#ifndef __U_BOOT__
1641 for (x = bltins; x->cmd; x++) {
1642 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1643 int squirrel[] = {-1, -1, -1};
1644 int rcode;
1645 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1646 debug_printf("magic exec\n");
1647 setup_redirects(child,NULL);
1648 return EXIT_SUCCESS;
1649 }
1650 debug_printf("builtin inline %s\n", child->argv[0]);
1651 /* XXX setup_redirects acts on file descriptors, not FILEs.
1652 * This is perfect for work that comes after exec().
1653 * Is it really safe for inline use? Experimentally,
1654 * things seem to work with glibc. */
1655 setup_redirects(child, squirrel);
Simon Glasse79731e2011-12-06 19:47:53 +00001656
1657 child->argv += i; /* XXX horrible hack */
1658 rcode = x->function(child);
1659 /* XXX restore hack so free() can work right */
1660 child->argv -= i;
1661 restore_redirects(squirrel);
1662 }
1663 return rcode;
1664 }
wdenkfe8c2802002-11-03 00:38:21 +00001665#else
Simon Glass1727b942012-02-14 19:59:25 +00001666 /* check ";", because ,example , argv consist from
1667 * "help;flinfo" must not execute
1668 */
1669 if (strchr(child->argv[i], ';')) {
1670 printf("Unknown command '%s' - try 'help' or use "
1671 "'run' command\n", child->argv[i]);
1672 return -1;
wdenkfe8c2802002-11-03 00:38:21 +00001673 }
Simon Glass1727b942012-02-14 19:59:25 +00001674 /* Process the command */
Sean Anderson69d61a32021-02-28 16:29:51 -05001675 return cmd_process(flag, child->argc - i, child->argv + i,
Richard Genoud94ff0672012-12-03 06:28:28 +00001676 &flag_repeat, NULL);
Simon Glass1727b942012-02-14 19:59:25 +00001677#endif
wdenkfe8c2802002-11-03 00:38:21 +00001678 }
Simon Glass1727b942012-02-14 19:59:25 +00001679#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +00001680
1681 for (i = 0; i < pi->num_progs; i++) {
1682 child = & (pi->progs[i]);
1683
1684 /* pipes are inserted between pairs of commands */
1685 if ((i + 1) < pi->num_progs) {
1686 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1687 nextout = pipefds[1];
1688 } else {
1689 nextout=1;
1690 pipefds[0] = -1;
1691 }
1692
1693 /* XXX test for failed fork()? */
1694 if (!(child->pid = fork())) {
1695 /* Set the handling for job control signals back to the default. */
1696 signal(SIGINT, SIG_DFL);
1697 signal(SIGQUIT, SIG_DFL);
1698 signal(SIGTERM, SIG_DFL);
1699 signal(SIGTSTP, SIG_DFL);
1700 signal(SIGTTIN, SIG_DFL);
1701 signal(SIGTTOU, SIG_DFL);
1702 signal(SIGCHLD, SIG_DFL);
1703
1704 close_all();
1705
1706 if (nextin != 0) {
1707 dup2(nextin, 0);
1708 close(nextin);
1709 }
1710 if (nextout != 1) {
1711 dup2(nextout, 1);
1712 close(nextout);
1713 }
1714 if (pipefds[0]!=-1) {
1715 close(pipefds[0]); /* opposite end of our output pipe */
1716 }
1717
1718 /* Like bash, explicit redirects override pipes,
1719 * and the pipe fd is available for dup'ing. */
1720 setup_redirects(child,NULL);
1721
1722 if (interactive && pi->followup!=PIPE_BG) {
1723 /* If we (the child) win the race, put ourselves in the process
1724 * group whose leader is the first process in this pipe. */
1725 if (pi->pgrp < 0) {
1726 pi->pgrp = getpid();
1727 }
1728 if (setpgid(0, pi->pgrp) == 0) {
1729 tcsetpgrp(2, pi->pgrp);
1730 }
1731 }
1732
1733 pseudo_exec(child);
1734 }
1735
1736
1737 /* put our child in the process group whose leader is the
1738 first process in this pipe */
1739 if (pi->pgrp < 0) {
1740 pi->pgrp = child->pid;
1741 }
1742 /* Don't check for errors. The child may be dead already,
1743 * in which case setpgid returns error code EACCES. */
1744 setpgid(child->pid, pi->pgrp);
1745
1746 if (nextin != 0)
1747 close(nextin);
1748 if (nextout != 1)
1749 close(nextout);
1750
1751 /* If there isn't another process, nextin is garbage
1752 but it doesn't matter */
1753 nextin = pipefds[0];
1754 }
1755#endif
1756 return -1;
1757}
1758
1759static int run_list_real(struct pipe *pi)
1760{
1761 char *save_name = NULL;
1762 char **list = NULL;
1763 char **save_list = NULL;
1764 struct pipe *rpipe;
1765 int flag_rep = 0;
1766#ifndef __U_BOOT__
1767 int save_num_progs;
1768#endif
1769 int rcode=0, flag_skip=1;
1770 int flag_restore = 0;
1771 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1772 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1773 /* check syntax for "for" */
1774 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1775 if ((rpipe->r_mode == RES_IN ||
1776 rpipe->r_mode == RES_FOR) &&
1777 (rpipe->next == NULL)) {
1778 syntax();
1779#ifdef __U_BOOT__
1780 flag_repeat = 0;
1781#endif
1782 return 1;
1783 }
1784 if ((rpipe->r_mode == RES_IN &&
1785 (rpipe->next->r_mode == RES_IN &&
1786 rpipe->next->progs->argv != NULL))||
1787 (rpipe->r_mode == RES_FOR &&
1788 rpipe->next->r_mode != RES_IN)) {
1789 syntax();
1790#ifdef __U_BOOT__
1791 flag_repeat = 0;
1792#endif
1793 return 1;
1794 }
1795 }
1796 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1797 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1798 pi->r_mode == RES_FOR) {
1799#ifdef __U_BOOT__
1800 /* check Ctrl-C */
1801 ctrlc();
1802 if ((had_ctrlc())) {
1803 return 1;
1804 }
1805#endif
1806 flag_restore = 0;
1807 if (!rpipe) {
1808 flag_rep = 0;
1809 rpipe = pi;
1810 }
1811 }
1812 rmode = pi->r_mode;
1813 debug_printf("rmode=%d if_code=%d next_if_code=%d skip_more=%d\n", rmode, if_code, next_if_code, skip_more_in_this_rmode);
1814 if (rmode == skip_more_in_this_rmode && flag_skip) {
1815 if (pi->followup == PIPE_SEQ) flag_skip=0;
1816 continue;
1817 }
1818 flag_skip = 1;
1819 skip_more_in_this_rmode = RES_XXXX;
1820 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1821 if (rmode == RES_THEN && if_code) continue;
1822 if (rmode == RES_ELSE && !if_code) continue;
wdenk33591052004-04-12 14:31:43 +00001823 if (rmode == RES_ELIF && !if_code) break;
wdenkfe8c2802002-11-03 00:38:21 +00001824 if (rmode == RES_FOR && pi->num_progs) {
1825 if (!list) {
1826 /* if no variable values after "in" we skip "for" */
1827 if (!pi->next->progs->argv) continue;
1828 /* create list of variable values */
1829 list = make_list_in(pi->next->progs->argv,
1830 pi->progs->argv[0]);
1831 save_list = list;
1832 save_name = pi->progs->argv[0];
1833 pi->progs->argv[0] = NULL;
1834 flag_rep = 1;
1835 }
1836 if (!(*list)) {
1837 free(pi->progs->argv[0]);
1838 free(save_list);
1839 list = NULL;
1840 flag_rep = 0;
1841 pi->progs->argv[0] = save_name;
1842#ifndef __U_BOOT__
1843 pi->progs->glob_result.gl_pathv[0] =
1844 pi->progs->argv[0];
1845#endif
1846 continue;
1847 } else {
1848 /* insert new value from list for variable */
Heinrich Schuchardta9889162020-04-28 21:56:10 +02001849 free(pi->progs->argv[0]);
wdenkfe8c2802002-11-03 00:38:21 +00001850 pi->progs->argv[0] = *list++;
1851#ifndef __U_BOOT__
1852 pi->progs->glob_result.gl_pathv[0] =
1853 pi->progs->argv[0];
1854#endif
1855 }
1856 }
1857 if (rmode == RES_IN) continue;
1858 if (rmode == RES_DO) {
1859 if (!flag_rep) continue;
1860 }
Jeroen Hofstee95ab0d32014-06-11 00:28:47 +02001861 if (rmode == RES_DONE) {
wdenkfe8c2802002-11-03 00:38:21 +00001862 if (flag_rep) {
1863 flag_restore = 1;
1864 } else {
1865 rpipe = NULL;
1866 }
1867 }
1868 if (pi->num_progs == 0) continue;
1869#ifndef __U_BOOT__
1870 save_num_progs = pi->num_progs; /* save number of programs */
1871#endif
1872 rcode = run_pipe_real(pi);
1873 debug_printf("run_pipe_real returned %d\n",rcode);
1874#ifndef __U_BOOT__
1875 if (rcode!=-1) {
1876 /* We only ran a builtin: rcode was set by the return value
1877 * of run_pipe_real(), and we don't need to wait for anything. */
1878 } else if (pi->followup==PIPE_BG) {
1879 /* XXX check bash's behavior with nontrivial pipes */
1880 /* XXX compute jobid */
1881 /* XXX what does bash do with attempts to background builtins? */
1882 insert_bg_job(pi);
1883 rcode = EXIT_SUCCESS;
1884 } else {
1885 if (interactive) {
1886 /* move the new process group into the foreground */
1887 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1888 perror_msg("tcsetpgrp-3");
1889 rcode = checkjobs(pi);
1890 /* move the shell to the foreground */
1891 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1892 perror_msg("tcsetpgrp-4");
1893 } else {
1894 rcode = checkjobs(pi);
1895 }
1896 debug_printf("checkjobs returned %d\n",rcode);
1897 }
1898 last_return_code=rcode;
1899#else
wdenk6203e402004-04-18 10:13:26 +00001900 if (rcode < -1) {
1901 last_return_code = -rcode - 2;
1902 return -2; /* exit */
1903 }
Marek Vasutfd099322022-12-20 07:25:59 +01001904 last_return_code = rcode;
wdenkfe8c2802002-11-03 00:38:21 +00001905#endif
1906#ifndef __U_BOOT__
1907 pi->num_progs = save_num_progs; /* restore number of programs */
1908#endif
1909 if ( rmode == RES_IF || rmode == RES_ELIF )
1910 next_if_code=rcode; /* can be overwritten a number of times */
1911 if (rmode == RES_WHILE)
1912 flag_rep = !last_return_code;
1913 if (rmode == RES_UNTIL)
1914 flag_rep = last_return_code;
1915 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1916 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1917 skip_more_in_this_rmode=rmode;
1918#ifndef __U_BOOT__
1919 checkjobs(NULL);
1920#endif
1921 }
1922 return rcode;
1923}
1924
1925/* broken, of course, but OK for testing */
1926static char *indenter(int i)
1927{
1928 static char blanks[]=" ";
1929 return &blanks[sizeof(blanks)-i-1];
1930}
1931
1932/* return code is the exit status of the pipe */
1933static int free_pipe(struct pipe *pi, int indent)
1934{
1935 char **p;
1936 struct child_prog *child;
1937#ifndef __U_BOOT__
1938 struct redir_struct *r, *rnext;
1939#endif
1940 int a, i, ret_code=0;
1941 char *ind = indenter(indent);
1942
1943#ifndef __U_BOOT__
1944 if (pi->stopped_progs > 0)
1945 return ret_code;
1946 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1947#endif
1948 for (i=0; i<pi->num_progs; i++) {
1949 child = &pi->progs[i];
1950 final_printf("%s command %d:\n",ind,i);
1951 if (child->argv) {
1952 for (a=0,p=child->argv; *p; a++,p++) {
1953 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1954 }
1955#ifndef __U_BOOT__
1956 globfree(&child->glob_result);
1957#else
Peter Tysercc215a12009-08-05 16:18:44 -05001958 for (a = 0; a < child->argc; a++) {
wdenk57b2d802003-06-27 21:31:46 +00001959 free(child->argv[a]);
1960 }
Stephen Warren60c38c92014-03-01 22:16:10 -07001961 free(child->argv);
1962 free(child->argv_nonnull);
wdenk57b2d802003-06-27 21:31:46 +00001963 child->argc = 0;
wdenkfe8c2802002-11-03 00:38:21 +00001964#endif
1965 child->argv=NULL;
1966 } else if (child->group) {
1967#ifndef __U_BOOT__
1968 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1969#endif
1970 ret_code = free_pipe_list(child->group,indent+3);
1971 final_printf("%s end group\n",ind);
1972 } else {
1973 final_printf("%s (nil)\n",ind);
1974 }
1975#ifndef __U_BOOT__
1976 for (r=child->redirects; r; r=rnext) {
1977 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1978 if (r->dup == -1) {
1979 /* guard against the case >$FOO, where foo is unset or blank */
1980 if (r->word.gl_pathv) {
1981 final_printf(" %s\n", *r->word.gl_pathv);
1982 globfree(&r->word);
1983 }
1984 } else {
1985 final_printf("&%d\n", r->dup);
1986 }
1987 rnext=r->next;
1988 free(r);
1989 }
1990 child->redirects=NULL;
1991#endif
1992 }
1993 free(pi->progs); /* children are an array, they get freed all at once */
1994 pi->progs=NULL;
1995 return ret_code;
1996}
1997
1998static int free_pipe_list(struct pipe *head, int indent)
1999{
2000 int rcode=0; /* if list has no members */
2001 struct pipe *pi, *next;
2002 char *ind = indenter(indent);
2003 for (pi=head; pi; pi=next) {
2004 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2005 rcode = free_pipe(pi, indent);
2006 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2007 next=pi->next;
2008 pi->next=NULL;
2009 free(pi);
2010 }
2011 return rcode;
2012}
2013
2014/* Select which version we will use */
2015static int run_list(struct pipe *pi)
2016{
2017 int rcode=0;
2018#ifndef __U_BOOT__
2019 if (fake_mode==0) {
2020#endif
2021 rcode = run_list_real(pi);
2022#ifndef __U_BOOT__
2023 }
2024#endif
2025 /* free_pipe_list has the side effect of clearing memory
2026 * In the long run that function can be merged with run_list_real,
2027 * but doing that now would hobble the debugging effort. */
2028 free_pipe_list(pi,0);
2029 return rcode;
2030}
2031
2032/* The API for glob is arguably broken. This routine pushes a non-matching
2033 * string into the output structure, removing non-backslashed backslashes.
2034 * If someone can prove me wrong, by performing this function within the
2035 * original glob(3) api, feel free to rewrite this routine into oblivion.
2036 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2037 * XXX broken if the last character is '\\', check that before calling.
2038 */
2039#ifndef __U_BOOT__
2040static int globhack(const char *src, int flags, glob_t *pglob)
2041{
2042 int cnt=0, pathc;
2043 const char *s;
2044 char *dest;
2045 for (cnt=1, s=src; s && *s; s++) {
2046 if (*s == '\\') s++;
2047 cnt++;
2048 }
2049 dest = malloc(cnt);
2050 if (!dest) return GLOB_NOSPACE;
2051 if (!(flags & GLOB_APPEND)) {
2052 pglob->gl_pathv=NULL;
2053 pglob->gl_pathc=0;
2054 pglob->gl_offs=0;
2055 pglob->gl_offs=0;
2056 }
2057 pathc = ++pglob->gl_pathc;
2058 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2059 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2060 pglob->gl_pathv[pathc-1]=dest;
2061 pglob->gl_pathv[pathc]=NULL;
2062 for (s=src; s && *s; s++, dest++) {
2063 if (*s == '\\') s++;
2064 *dest = *s;
2065 }
2066 *dest='\0';
2067 return 0;
2068}
2069
2070/* XXX broken if the last character is '\\', check that before calling */
2071static int glob_needed(const char *s)
2072{
2073 for (; *s; s++) {
2074 if (*s == '\\') s++;
2075 if (strchr("*[?",*s)) return 1;
2076 }
2077 return 0;
2078}
2079
2080#if 0
2081static void globprint(glob_t *pglob)
2082{
2083 int i;
2084 debug_printf("glob_t at %p:\n", pglob);
2085 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2086 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2087 for (i=0; i<pglob->gl_pathc; i++)
2088 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2089 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2090}
2091#endif
2092
2093static int xglob(o_string *dest, int flags, glob_t *pglob)
2094{
2095 int gr;
2096
wdenk57b2d802003-06-27 21:31:46 +00002097 /* short-circuit for null word */
wdenkfe8c2802002-11-03 00:38:21 +00002098 /* we can code this better when the debug_printf's are gone */
wdenk57b2d802003-06-27 21:31:46 +00002099 if (dest->length == 0) {
2100 if (dest->nonnull) {
2101 /* bash man page calls this an "explicit" null */
2102 gr = globhack(dest->data, flags, pglob);
2103 debug_printf("globhack returned %d\n",gr);
2104 } else {
wdenkfe8c2802002-11-03 00:38:21 +00002105 return 0;
2106 }
wdenk57b2d802003-06-27 21:31:46 +00002107 } else if (glob_needed(dest->data)) {
wdenkfe8c2802002-11-03 00:38:21 +00002108 gr = glob(dest->data, flags, NULL, pglob);
2109 debug_printf("glob returned %d\n",gr);
2110 if (gr == GLOB_NOMATCH) {
2111 /* quote removal, or more accurately, backslash removal */
2112 gr = globhack(dest->data, flags, pglob);
2113 debug_printf("globhack returned %d\n",gr);
2114 }
2115 } else {
2116 gr = globhack(dest->data, flags, pglob);
2117 debug_printf("globhack returned %d\n",gr);
2118 }
2119 if (gr == GLOB_NOSPACE)
2120 error_msg_and_die("out of memory during glob");
2121 if (gr != 0) { /* GLOB_ABORTED ? */
2122 error_msg("glob(3) error %d",gr);
2123 }
2124 /* globprint(glob_target); */
2125 return gr;
2126}
2127#endif
2128
wdenk6203e402004-04-18 10:13:26 +00002129#ifdef __U_BOOT__
2130static char *get_dollar_var(char ch);
2131#endif
2132
wdenkfe8c2802002-11-03 00:38:21 +00002133/* This is used to get/check local shell variables */
Holger Brunck50950222011-04-08 02:47:42 +00002134char *get_local_var(const char *s)
wdenkfe8c2802002-11-03 00:38:21 +00002135{
2136 struct variables *cur;
2137
2138 if (!s)
2139 return NULL;
wdenk6203e402004-04-18 10:13:26 +00002140
2141#ifdef __U_BOOT__
2142 if (*s == '$')
2143 return get_dollar_var(s[1]);
2144#endif
2145
wdenkfe8c2802002-11-03 00:38:21 +00002146 for (cur = top_vars; cur; cur=cur->next)
2147 if(strcmp(cur->name, s)==0)
2148 return cur->value;
2149 return NULL;
2150}
2151
2152/* This is used to set local shell variables
2153 flg_export==0 if only local (not exporting) variable
2154 flg_export==1 if "new" exporting environ
2155 flg_export>1 if current startup environ (not call putenv()) */
Heiko Schocher49ebcb52008-10-15 09:40:28 +02002156int set_local_var(const char *s, int flg_export)
wdenkfe8c2802002-11-03 00:38:21 +00002157{
2158 char *name, *value;
2159 int result=0;
2160 struct variables *cur;
2161
wdenk6203e402004-04-18 10:13:26 +00002162#ifdef __U_BOOT__
2163 /* might be possible! */
2164 if (!isalpha(*s))
2165 return -1;
2166#endif
2167
wdenkfe8c2802002-11-03 00:38:21 +00002168 name=strdup(s);
2169
wdenkfe8c2802002-11-03 00:38:21 +00002170 /* Assume when we enter this function that we are already in
2171 * NAME=VALUE format. So the first order of business is to
2172 * split 's' on the '=' into 'name' and 'value' */
2173 value = strchr(name, '=');
Stefan Herbrechtsmeier466a3e92023-04-03 15:50:00 +02002174 if (!value) {
wdenkfe8c2802002-11-03 00:38:21 +00002175 free(name);
2176 return -1;
2177 }
2178 *value++ = 0;
2179
Stefan Herbrechtsmeier466a3e92023-04-03 15:50:00 +02002180 if (!*value) {
2181 unset_local_var(name);
2182 free(name);
2183 return 0;
2184 }
2185
wdenkfe8c2802002-11-03 00:38:21 +00002186 for(cur = top_vars; cur; cur = cur->next) {
2187 if(strcmp(cur->name, name)==0)
2188 break;
2189 }
2190
2191 if(cur) {
2192 if(strcmp(cur->value, value)==0) {
2193 if(flg_export>0 && cur->flg_export==0)
2194 cur->flg_export=flg_export;
2195 else
2196 result++;
2197 } else {
2198 if(cur->flg_read_only) {
2199 error_msg("%s: readonly variable", name);
2200 result = -1;
2201 } else {
2202 if(flg_export>0 || cur->flg_export>1)
2203 cur->flg_export=1;
2204 free(cur->value);
2205
2206 cur->value = strdup(value);
2207 }
2208 }
2209 } else {
2210 cur = malloc(sizeof(struct variables));
2211 if(!cur) {
2212 result = -1;
2213 } else {
2214 cur->name = strdup(name);
Kim Phillipsb052b602012-10-29 13:34:32 +00002215 if (cur->name == NULL) {
wdenkfe8c2802002-11-03 00:38:21 +00002216 free(cur);
2217 result = -1;
2218 } else {
2219 struct variables *bottom = top_vars;
2220 cur->value = strdup(value);
Kim Phillipsb052b602012-10-29 13:34:32 +00002221 cur->next = NULL;
wdenkfe8c2802002-11-03 00:38:21 +00002222 cur->flg_export = flg_export;
2223 cur->flg_read_only = 0;
2224 while(bottom->next) bottom=bottom->next;
2225 bottom->next = cur;
2226 }
2227 }
2228 }
2229
2230#ifndef __U_BOOT__
2231 if(result==0 && cur->flg_export==1) {
2232 *(value-1) = '=';
2233 result = putenv(name);
2234 } else {
2235#endif
2236 free(name);
2237#ifndef __U_BOOT__
2238 if(result>0) /* equivalent to previous set */
2239 result = 0;
2240 }
2241#endif
2242 return result;
2243}
2244
Heiko Schocher49ebcb52008-10-15 09:40:28 +02002245void unset_local_var(const char *name)
wdenkfe8c2802002-11-03 00:38:21 +00002246{
2247 struct variables *cur;
2248
2249 if (name) {
2250 for (cur = top_vars; cur; cur=cur->next) {
2251 if(strcmp(cur->name, name)==0)
2252 break;
2253 }
Kim Phillipsb052b602012-10-29 13:34:32 +00002254 if (cur != NULL) {
wdenkfe8c2802002-11-03 00:38:21 +00002255 struct variables *next = top_vars;
2256 if(cur->flg_read_only) {
2257 error_msg("%s: readonly variable", name);
2258 return;
2259 } else {
Heiko Schocher49ebcb52008-10-15 09:40:28 +02002260#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +00002261 if(cur->flg_export)
Simon Glass6a38e412017-08-03 12:22:09 -06002262 unenv_set(cur->name);
Heiko Schocher49ebcb52008-10-15 09:40:28 +02002263#endif
wdenkfe8c2802002-11-03 00:38:21 +00002264 free(cur->name);
2265 free(cur->value);
2266 while (next->next != cur)
2267 next = next->next;
2268 next->next = cur->next;
2269 }
2270 free(cur);
2271 }
2272 }
2273}
wdenkfe8c2802002-11-03 00:38:21 +00002274
2275static int is_assignment(const char *s)
2276{
wdenk6203e402004-04-18 10:13:26 +00002277 if (s == NULL)
2278 return 0;
2279
2280 if (!isalpha(*s)) return 0;
wdenkfe8c2802002-11-03 00:38:21 +00002281 ++s;
2282 while(isalnum(*s) || *s=='_') ++s;
2283 return *s=='=';
2284}
2285
2286#ifndef __U_BOOT__
2287/* the src parameter allows us to peek forward to a possible &n syntax
2288 * for file descriptor duplication, e.g., "2>&1".
2289 * Return code is 0 normally, 1 if a syntax error is detected in src.
2290 * Resource errors (in xmalloc) cause the process to exit */
2291static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2292 struct in_str *input)
2293{
2294 struct child_prog *child=ctx->child;
2295 struct redir_struct *redir = child->redirects;
2296 struct redir_struct *last_redir=NULL;
2297
2298 /* Create a new redir_struct and drop it onto the end of the linked list */
2299 while(redir) {
2300 last_redir=redir;
2301 redir=redir->next;
2302 }
2303 redir = xmalloc(sizeof(struct redir_struct));
2304 redir->next=NULL;
2305 redir->word.gl_pathv=NULL;
2306 if (last_redir) {
2307 last_redir->next=redir;
2308 } else {
2309 child->redirects=redir;
2310 }
2311
2312 redir->type=style;
2313 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2314
2315 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2316
2317 /* Check for a '2>&1' type redirect */
2318 redir->dup = redirect_dup_num(input);
2319 if (redir->dup == -2) return 1; /* syntax error */
2320 if (redir->dup != -1) {
2321 /* Erik had a check here that the file descriptor in question
2322 * is legit; I postpone that to "run time"
2323 * A "-" representation of "close me" shows up as a -3 here */
2324 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2325 } else {
2326 /* We do _not_ try to open the file that src points to,
2327 * since we need to return and let src be expanded first.
2328 * Set ctx->pending_redirect, so we know what to do at the
2329 * end of the next parsed word.
2330 */
2331 ctx->pending_redirect = redir;
2332 }
2333 return 0;
2334}
2335#endif
2336
Kim Phillipsb052b602012-10-29 13:34:32 +00002337static struct pipe *new_pipe(void)
2338{
wdenkfe8c2802002-11-03 00:38:21 +00002339 struct pipe *pi;
2340 pi = xmalloc(sizeof(struct pipe));
2341 pi->num_progs = 0;
2342 pi->progs = NULL;
2343 pi->next = NULL;
2344 pi->followup = 0; /* invalid */
Wolfgang Denk00b67fd2005-09-28 01:49:47 +02002345 pi->r_mode = RES_NONE;
wdenkfe8c2802002-11-03 00:38:21 +00002346 return pi;
2347}
2348
2349static void initialize_context(struct p_context *ctx)
2350{
2351 ctx->pipe=NULL;
2352#ifndef __U_BOOT__
2353 ctx->pending_redirect=NULL;
2354#endif
2355 ctx->child=NULL;
2356 ctx->list_head=new_pipe();
2357 ctx->pipe=ctx->list_head;
2358 ctx->w=RES_NONE;
2359 ctx->stack=NULL;
2360#ifdef __U_BOOT__
2361 ctx->old_flag=0;
2362#endif
2363 done_command(ctx); /* creates the memory for working child */
2364}
2365
2366/* normal return is 0
2367 * if a reserved word is found, and processed, return 1
2368 * should handle if, then, elif, else, fi, for, while, until, do, done.
2369 * case, function, and select are obnoxious, save those for later.
2370 */
wdenkb02744a2003-04-05 00:53:31 +00002371struct reserved_combo {
2372 char *literal;
2373 int code;
2374 long flag;
2375};
2376/* Mostly a list of accepted follow-up reserved words.
2377 * FLAG_END means we are done with the sequence, and are ready
2378 * to turn the compound list into a command.
2379 * FLAG_START means the word must start a new compound list.
2380 */
2381static struct reserved_combo reserved_list[] = {
2382 { "if", RES_IF, FLAG_THEN | FLAG_START },
2383 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2384 { "elif", RES_ELIF, FLAG_THEN },
2385 { "else", RES_ELSE, FLAG_FI },
2386 { "fi", RES_FI, FLAG_END },
2387 { "for", RES_FOR, FLAG_IN | FLAG_START },
2388 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2389 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2390 { "in", RES_IN, FLAG_DO },
2391 { "do", RES_DO, FLAG_DONE },
2392 { "done", RES_DONE, FLAG_END }
2393};
2394#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2395
Kim Phillipsb052b602012-10-29 13:34:32 +00002396static int reserved_word(o_string *dest, struct p_context *ctx)
wdenkfe8c2802002-11-03 00:38:21 +00002397{
wdenkfe8c2802002-11-03 00:38:21 +00002398 struct reserved_combo *r;
2399 for (r=reserved_list;
wdenkfe8c2802002-11-03 00:38:21 +00002400 r<reserved_list+NRES; r++) {
2401 if (strcmp(dest->data, r->literal) == 0) {
2402 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2403 if (r->flag & FLAG_START) {
2404 struct p_context *new = xmalloc(sizeof(struct p_context));
2405 debug_printf("push stack\n");
2406 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2407 syntax();
2408 free(new);
2409 ctx->w = RES_SNTX;
2410 b_reset(dest);
2411 return 1;
2412 }
2413 *new = *ctx; /* physical copy */
2414 initialize_context(ctx);
2415 ctx->stack=new;
2416 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2417 syntax();
2418 ctx->w = RES_SNTX;
2419 b_reset(dest);
2420 return 1;
2421 }
2422 ctx->w=r->code;
2423 ctx->old_flag = r->flag;
2424 if (ctx->old_flag & FLAG_END) {
2425 struct p_context *old;
2426 debug_printf("pop stack\n");
2427 done_pipe(ctx,PIPE_SEQ);
2428 old = ctx->stack;
2429 old->child->group = ctx->list_head;
2430#ifndef __U_BOOT__
2431 old->child->subshell = 0;
2432#endif
2433 *ctx = *old; /* physical copy */
2434 free(old);
2435 }
2436 b_reset (dest);
2437 return 1;
2438 }
2439 }
2440 return 0;
2441}
2442
2443/* normal return is 0.
2444 * Syntax or xglob errors return 1. */
2445static int done_word(o_string *dest, struct p_context *ctx)
2446{
2447 struct child_prog *child=ctx->child;
2448#ifndef __U_BOOT__
2449 glob_t *glob_target;
2450 int gr, flags = 0;
2451#else
2452 char *str, *s;
2453 int argc, cnt;
2454#endif
2455
2456 debug_printf("done_word: %s %p\n", dest->data, child);
2457 if (dest->length == 0 && !dest->nonnull) {
2458 debug_printf(" true null, ignored\n");
2459 return 0;
2460 }
2461#ifndef __U_BOOT__
2462 if (ctx->pending_redirect) {
2463 glob_target = &ctx->pending_redirect->word;
2464 } else {
2465#endif
2466 if (child->group) {
2467 syntax();
2468 return 1; /* syntax error, groups and arglists don't mix */
2469 }
2470 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2471 debug_printf("checking %s for reserved-ness\n",dest->data);
2472 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2473 }
2474#ifndef __U_BOOT__
2475 glob_target = &child->glob_result;
wdenk57b2d802003-06-27 21:31:46 +00002476 if (child->argv) flags |= GLOB_APPEND;
wdenkfe8c2802002-11-03 00:38:21 +00002477#else
2478 for (cnt = 1, s = dest->data; s && *s; s++) {
2479 if (*s == '\\') s++;
2480 cnt++;
2481 }
2482 str = malloc(cnt);
2483 if (!str) return 1;
2484 if ( child->argv == NULL) {
2485 child->argc=0;
2486 }
2487 argc = ++child->argc;
2488 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
Peng Fan27a9d262015-11-27 10:12:02 +08002489 if (child->argv == NULL) {
2490 free(str);
2491 return 1;
2492 }
Stephen Warren60c38c92014-03-01 22:16:10 -07002493 child->argv_nonnull = realloc(child->argv_nonnull,
2494 (argc+1)*sizeof(*child->argv_nonnull));
Peng Fan27a9d262015-11-27 10:12:02 +08002495 if (child->argv_nonnull == NULL) {
2496 free(str);
Stephen Warren60c38c92014-03-01 22:16:10 -07002497 return 1;
Peng Fan27a9d262015-11-27 10:12:02 +08002498 }
wdenkfe8c2802002-11-03 00:38:21 +00002499 child->argv[argc-1]=str;
Stephen Warren60c38c92014-03-01 22:16:10 -07002500 child->argv_nonnull[argc-1] = dest->nonnull;
wdenkfe8c2802002-11-03 00:38:21 +00002501 child->argv[argc]=NULL;
Stephen Warren60c38c92014-03-01 22:16:10 -07002502 child->argv_nonnull[argc] = 0;
wdenkfe8c2802002-11-03 00:38:21 +00002503 for (s = dest->data; s && *s; s++,str++) {
2504 if (*s == '\\') s++;
2505 *str = *s;
2506 }
2507 *str = '\0';
2508#endif
2509#ifndef __U_BOOT__
2510 }
2511 gr = xglob(dest, flags, glob_target);
2512 if (gr != 0) return 1;
2513#endif
2514
2515 b_reset(dest);
2516#ifndef __U_BOOT__
2517 if (ctx->pending_redirect) {
2518 ctx->pending_redirect=NULL;
2519 if (glob_target->gl_pathc != 1) {
2520 error_msg("ambiguous redirect");
2521 return 1;
2522 }
2523 } else {
2524 child->argv = glob_target->gl_pathv;
2525 }
2526#endif
2527 if (ctx->w == RES_FOR) {
2528 done_word(dest,ctx);
2529 done_pipe(ctx,PIPE_SEQ);
2530 }
2531 return 0;
2532}
2533
2534/* The only possible error here is out of memory, in which case
2535 * xmalloc exits. */
2536static int done_command(struct p_context *ctx)
2537{
2538 /* The child is really already in the pipe structure, so
2539 * advance the pipe counter and make a new, null child.
2540 * Only real trickiness here is that the uncommitted
2541 * child structure, to which ctx->child points, is not
2542 * counted in pi->num_progs. */
2543 struct pipe *pi=ctx->pipe;
2544 struct child_prog *prog=ctx->child;
2545
2546 if (prog && prog->group == NULL
wdenk57b2d802003-06-27 21:31:46 +00002547 && prog->argv == NULL
wdenkfe8c2802002-11-03 00:38:21 +00002548#ifndef __U_BOOT__
wdenk57b2d802003-06-27 21:31:46 +00002549 && prog->redirects == NULL) {
wdenkfe8c2802002-11-03 00:38:21 +00002550#else
2551 ) {
2552#endif
2553 debug_printf("done_command: skipping null command\n");
2554 return 0;
2555 } else if (prog) {
2556 pi->num_progs++;
2557 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2558 } else {
2559 debug_printf("done_command: initializing\n");
2560 }
2561 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2562
2563 prog = pi->progs + pi->num_progs;
2564#ifndef __U_BOOT__
2565 prog->redirects = NULL;
2566#endif
2567 prog->argv = NULL;
Stephen Warren60c38c92014-03-01 22:16:10 -07002568 prog->argv_nonnull = NULL;
wdenkfe8c2802002-11-03 00:38:21 +00002569#ifndef __U_BOOT__
2570 prog->is_stopped = 0;
2571#endif
2572 prog->group = NULL;
2573#ifndef __U_BOOT__
2574 prog->glob_result.gl_pathv = NULL;
2575 prog->family = pi;
2576#endif
2577 prog->sp = 0;
2578 ctx->child = prog;
2579 prog->type = ctx->type;
2580
2581 /* but ctx->pipe and ctx->list_head remain unchanged */
2582 return 0;
2583}
2584
2585static int done_pipe(struct p_context *ctx, pipe_style type)
2586{
2587 struct pipe *new_p;
2588 done_command(ctx); /* implicit closure of previous command */
2589 debug_printf("done_pipe, type %d\n", type);
2590 ctx->pipe->followup = type;
2591 ctx->pipe->r_mode = ctx->w;
2592 new_p=new_pipe();
2593 ctx->pipe->next = new_p;
2594 ctx->pipe = new_p;
2595 ctx->child = NULL;
2596 done_command(ctx); /* set up new pipe to accept commands */
2597 return 0;
2598}
2599
2600#ifndef __U_BOOT__
2601/* peek ahead in the in_str to find out if we have a "&n" construct,
2602 * as in "2>&1", that represents duplicating a file descriptor.
2603 * returns either -2 (syntax error), -1 (no &), or the number found.
2604 */
2605static int redirect_dup_num(struct in_str *input)
2606{
2607 int ch, d=0, ok=0;
2608 ch = b_peek(input);
2609 if (ch != '&') return -1;
2610
2611 b_getch(input); /* get the & */
2612 ch=b_peek(input);
2613 if (ch == '-') {
2614 b_getch(input);
2615 return -3; /* "-" represents "close me" */
2616 }
2617 while (isdigit(ch)) {
2618 d = d*10+(ch-'0');
2619 ok=1;
2620 b_getch(input);
2621 ch = b_peek(input);
2622 }
2623 if (ok) return d;
2624
2625 error_msg("ambiguous redirect");
2626 return -2;
2627}
2628
2629/* If a redirect is immediately preceded by a number, that number is
2630 * supposed to tell which file descriptor to redirect. This routine
2631 * looks for such preceding numbers. In an ideal world this routine
2632 * needs to handle all the following classes of redirects...
2633 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2634 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2635 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2636 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2637 * A -1 output from this program means no valid number was found, so the
2638 * caller should use the appropriate default for this redirection.
2639 */
2640static int redirect_opt_num(o_string *o)
2641{
2642 int num;
2643
2644 if (o->length==0) return -1;
2645 for(num=0; num<o->length; num++) {
2646 if (!isdigit(*(o->data+num))) {
2647 return -1;
2648 }
2649 }
2650 /* reuse num (and save an int) */
2651 num=atoi(o->data);
2652 b_reset(o);
2653 return num;
2654}
2655
2656FILE *generate_stream_from_list(struct pipe *head)
2657{
2658 FILE *pf;
2659#if 1
2660 int pid, channel[2];
2661 if (pipe(channel)<0) perror_msg_and_die("pipe");
2662 pid=fork();
2663 if (pid<0) {
2664 perror_msg_and_die("fork");
2665 } else if (pid==0) {
2666 close(channel[0]);
2667 if (channel[1] != 1) {
2668 dup2(channel[1],1);
2669 close(channel[1]);
2670 }
2671#if 0
2672#define SURROGATE "surrogate response"
2673 write(1,SURROGATE,sizeof(SURROGATE));
2674 _exit(run_list(head));
2675#else
2676 _exit(run_list_real(head)); /* leaks memory */
2677#endif
2678 }
2679 debug_printf("forked child %d\n",pid);
2680 close(channel[1]);
2681 pf = fdopen(channel[0],"r");
2682 debug_printf("pipe on FILE *%p\n",pf);
2683#else
2684 free_pipe_list(head,0);
2685 pf=popen("echo surrogate response","r");
2686 debug_printf("started fake pipe on FILE *%p\n",pf);
2687#endif
2688 return pf;
2689}
2690
2691/* this version hacked for testing purposes */
2692/* return code is exit status of the process that is run. */
2693static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2694{
2695 int retcode;
2696 o_string result=NULL_O_STRING;
2697 struct p_context inner;
2698 FILE *p;
2699 struct in_str pipe_str;
2700 initialize_context(&inner);
2701
2702 /* recursion to generate command */
2703 retcode = parse_stream(&result, &inner, input, subst_end);
2704 if (retcode != 0) return retcode; /* syntax error or EOF */
2705 done_word(&result, &inner);
2706 done_pipe(&inner, PIPE_SEQ);
2707 b_free(&result);
2708
2709 p=generate_stream_from_list(inner.list_head);
2710 if (p==NULL) return 1;
2711 mark_open(fileno(p));
2712 setup_file_in_str(&pipe_str, p);
2713
2714 /* now send results of command back into original context */
2715 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2716 /* XXX In case of a syntax error, should we try to kill the child?
2717 * That would be tough to do right, so just read until EOF. */
2718 if (retcode == 1) {
2719 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2720 }
2721
2722 debug_printf("done reading from pipe, pclose()ing\n");
2723 /* This is the step that wait()s for the child. Should be pretty
2724 * safe, since we just read an EOF from its stdout. We could try
2725 * to better, by using wait(), and keeping track of background jobs
2726 * at the same time. That would be a lot of work, and contrary
2727 * to the KISS philosophy of this program. */
2728 mark_closed(fileno(p));
2729 retcode=pclose(p);
2730 free_pipe_list(inner.list_head,0);
2731 debug_printf("pclosed, retcode=%d\n",retcode);
2732 /* XXX this process fails to trim a single trailing newline */
2733 return retcode;
2734}
2735
2736static int parse_group(o_string *dest, struct p_context *ctx,
2737 struct in_str *input, int ch)
2738{
2739 int rcode, endch=0;
2740 struct p_context sub;
2741 struct child_prog *child = ctx->child;
2742 if (child->argv) {
2743 syntax();
2744 return 1; /* syntax error, groups and arglists don't mix */
2745 }
2746 initialize_context(&sub);
2747 switch(ch) {
2748 case '(': endch=')'; child->subshell=1; break;
2749 case '{': endch='}'; break;
2750 default: syntax(); /* really logic error */
2751 }
2752 rcode=parse_stream(dest,&sub,input,endch);
2753 done_word(dest,&sub); /* finish off the final word in the subcontext */
2754 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2755 child->group = sub.list_head;
2756 return rcode;
2757 /* child remains "open", available for possible redirects */
2758}
2759#endif
2760
2761/* basically useful version until someone wants to get fancier,
2762 * see the bash man page under "Parameter Expansion" */
2763static char *lookup_param(char *src)
2764{
wdenk6203e402004-04-18 10:13:26 +00002765 char *p;
Joe Hershberger82fea772012-08-17 10:26:29 +00002766 char *sep;
2767 char *default_val = NULL;
2768 int assign = 0;
2769 int expand_empty = 0;
wdenk6203e402004-04-18 10:13:26 +00002770
2771 if (!src)
2772 return NULL;
2773
Joe Hershberger82fea772012-08-17 10:26:29 +00002774 sep = strchr(src, ':');
2775
2776 if (sep) {
2777 *sep = '\0';
2778 if (*(sep + 1) == '-')
2779 default_val = sep+2;
2780 if (*(sep + 1) == '=') {
2781 default_val = sep+2;
2782 assign = 1;
2783 }
2784 if (*(sep + 1) == '+') {
2785 default_val = sep+2;
2786 expand_empty = 1;
2787 }
2788 }
2789
Simon Glass64b723f2017-08-03 12:22:12 -06002790 p = env_get(src);
Joe Hershberger82fea772012-08-17 10:26:29 +00002791 if (!p)
2792 p = get_local_var(src);
2793
2794 if (!p || strlen(p) == 0) {
2795 p = default_val;
2796 if (assign) {
2797 char *var = malloc(strlen(src)+strlen(default_val)+2);
2798 if (var) {
2799 sprintf(var, "%s=%s", src, default_val);
2800 set_local_var(var, 0);
2801 }
2802 free(var);
2803 }
2804 } else if (expand_empty) {
2805 p += strlen(p);
2806 }
2807
2808 if (sep)
2809 *sep = ':';
wdenk6203e402004-04-18 10:13:26 +00002810
wdenkfe8c2802002-11-03 00:38:21 +00002811 return p;
2812}
wdenk6203e402004-04-18 10:13:26 +00002813
2814#ifdef __U_BOOT__
2815static char *get_dollar_var(char ch)
2816{
2817 static char buf[40];
2818
2819 buf[0] = '\0';
2820 switch (ch) {
2821 case '?':
2822 sprintf(buf, "%u", (unsigned int)last_return_code);
2823 break;
2824 default:
2825 return NULL;
2826 }
2827 return buf;
2828}
2829#endif
wdenkfe8c2802002-11-03 00:38:21 +00002830
2831/* return code: 0 for OK, 1 for syntax error */
2832static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2833{
2834#ifndef __U_BOOT__
2835 int i, advance=0;
2836#else
2837 int advance=0;
2838#endif
2839#ifndef __U_BOOT__
2840 char sep[]=" ";
2841#endif
2842 int ch = input->peek(input); /* first character after the $ */
2843 debug_printf("handle_dollar: ch=%c\n",ch);
2844 if (isalpha(ch)) {
2845 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2846 ctx->child->sp++;
2847 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2848 b_getch(input);
2849 b_addchr(dest,ch);
2850 }
2851 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2852#ifndef __U_BOOT__
2853 } else if (isdigit(ch)) {
2854 i = ch-'0'; /* XXX is $0 special? */
2855 if (i<global_argc) {
2856 parse_string(dest, ctx, global_argv[i]); /* recursion */
2857 }
2858 advance = 1;
2859#endif
2860 } else switch (ch) {
2861#ifndef __U_BOOT__
2862 case '$':
2863 b_adduint(dest,getpid());
2864 advance = 1;
2865 break;
2866 case '!':
2867 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2868 advance = 1;
2869 break;
2870#endif
2871 case '?':
wdenk6203e402004-04-18 10:13:26 +00002872#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +00002873 b_adduint(dest,last_return_code);
wdenk6203e402004-04-18 10:13:26 +00002874#else
2875 ctx->child->sp++;
2876 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2877 b_addchr(dest, '$');
2878 b_addchr(dest, '?');
2879 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2880#endif
wdenkfe8c2802002-11-03 00:38:21 +00002881 advance = 1;
2882 break;
2883#ifndef __U_BOOT__
2884 case '#':
2885 b_adduint(dest,global_argc ? global_argc-1 : 0);
2886 advance = 1;
2887 break;
2888#endif
2889 case '{':
2890 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2891 ctx->child->sp++;
2892 b_getch(input);
2893 /* XXX maybe someone will try to escape the '}' */
2894 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2895 b_addchr(dest,ch);
2896 }
2897 if (ch != '}') {
2898 syntax();
2899 return 1;
2900 }
2901 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2902 break;
2903#ifndef __U_BOOT__
2904 case '(':
2905 b_getch(input);
2906 process_command_subs(dest, ctx, input, ')');
2907 break;
2908 case '*':
2909 sep[0]=ifs[0];
2910 for (i=1; i<global_argc; i++) {
2911 parse_string(dest, ctx, global_argv[i]);
2912 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2913 }
2914 break;
2915 case '@':
2916 case '-':
2917 case '_':
2918 /* still unhandled, but should be eventually */
2919 error_msg("unhandled syntax: $%c",ch);
2920 return 1;
2921 break;
2922#endif
2923 default:
2924 b_addqchr(dest,'$',dest->quote);
2925 }
2926 /* Eat the character if the flag was set. If the compiler
2927 * is smart enough, we could substitute "b_getch(input);"
2928 * for all the "advance = 1;" above, and also end up with
2929 * a nice size-optimized program. Hah! That'll be the day.
2930 */
2931 if (advance) b_getch(input);
2932 return 0;
2933}
2934
2935#ifndef __U_BOOT__
2936int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2937{
2938 struct in_str foo;
2939 setup_string_in_str(&foo, src);
2940 return parse_stream(dest, ctx, &foo, '\0');
2941}
2942#endif
2943
2944/* return code is 0 for normal exit, 1 for syntax error */
Kim Phillipsb052b602012-10-29 13:34:32 +00002945static int parse_stream(o_string *dest, struct p_context *ctx,
2946 struct in_str *input, int end_trigger)
wdenkfe8c2802002-11-03 00:38:21 +00002947{
2948 unsigned int ch, m;
2949#ifndef __U_BOOT__
2950 int redir_fd;
2951 redir_type redir_style;
2952#endif
2953 int next;
2954
2955 /* Only double-quote state is handled in the state variable dest->quote.
2956 * A single-quote triggers a bypass of the main loop until its mate is
2957 * found. When recursing, quote state is passed in via dest->quote. */
2958
2959 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2960 while ((ch=b_getch(input))!=EOF) {
2961 m = map[ch];
2962#ifdef __U_BOOT__
2963 if (input->__promptme == 0) return 1;
2964#endif
2965 next = (ch == '\n') ? 0 : b_peek(input);
wdenk6203e402004-04-18 10:13:26 +00002966
2967 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2968 ch >= ' ' ? ch : '.', ch, m,
2969 dest->quote, ctx->stack == NULL ? '*' : '.');
2970
wdenkfe8c2802002-11-03 00:38:21 +00002971 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2972 b_addqchr(dest, ch, dest->quote);
2973 } else {
2974 if (m==2) { /* unquoted IFS */
2975 if (done_word(dest, ctx)) {
2976 return 1;
2977 }
2978 /* If we aren't performing a substitution, treat a newline as a
2979 * command separator. */
2980 if (end_trigger != '\0' && ch=='\n')
2981 done_pipe(ctx,PIPE_SEQ);
2982 }
2983 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2984 debug_printf("leaving parse_stream (triggered)\n");
2985 return 0;
2986 }
2987#if 0
2988 if (ch=='\n') {
2989 /* Yahoo! Time to run with it! */
2990 done_pipe(ctx,PIPE_SEQ);
2991 run_list(ctx->list_head);
2992 initialize_context(ctx);
2993 }
2994#endif
2995 if (m!=2) switch (ch) {
2996 case '#':
2997 if (dest->length == 0 && !dest->quote) {
2998 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2999 } else {
3000 b_addqchr(dest, ch, dest->quote);
3001 }
3002 break;
3003 case '\\':
3004 if (next == EOF) {
3005 syntax();
3006 return 1;
3007 }
3008 b_addqchr(dest, '\\', dest->quote);
3009 b_addqchr(dest, b_getch(input), dest->quote);
3010 break;
3011 case '$':
3012 if (handle_dollar(dest, ctx, input)!=0) return 1;
3013 break;
3014 case '\'':
3015 dest->nonnull = 1;
3016 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3017#ifdef __U_BOOT__
3018 if(input->__promptme == 0) return 1;
3019#endif
3020 b_addchr(dest,ch);
3021 }
3022 if (ch==EOF) {
3023 syntax();
3024 return 1;
3025 }
3026 break;
3027 case '"':
3028 dest->nonnull = 1;
3029 dest->quote = !dest->quote;
3030 break;
3031#ifndef __U_BOOT__
3032 case '`':
3033 process_command_subs(dest, ctx, input, '`');
3034 break;
3035 case '>':
3036 redir_fd = redirect_opt_num(dest);
3037 done_word(dest, ctx);
3038 redir_style=REDIRECT_OVERWRITE;
3039 if (next == '>') {
3040 redir_style=REDIRECT_APPEND;
3041 b_getch(input);
3042 } else if (next == '(') {
3043 syntax(); /* until we support >(list) Process Substitution */
3044 return 1;
3045 }
3046 setup_redirect(ctx, redir_fd, redir_style, input);
3047 break;
3048 case '<':
3049 redir_fd = redirect_opt_num(dest);
3050 done_word(dest, ctx);
3051 redir_style=REDIRECT_INPUT;
3052 if (next == '<') {
3053 redir_style=REDIRECT_HEREIS;
3054 b_getch(input);
3055 } else if (next == '>') {
3056 redir_style=REDIRECT_IO;
3057 b_getch(input);
3058 } else if (next == '(') {
3059 syntax(); /* until we support <(list) Process Substitution */
3060 return 1;
3061 }
3062 setup_redirect(ctx, redir_fd, redir_style, input);
3063 break;
3064#endif
3065 case ';':
3066 done_word(dest, ctx);
3067 done_pipe(ctx,PIPE_SEQ);
3068 break;
3069 case '&':
3070 done_word(dest, ctx);
3071 if (next=='&') {
3072 b_getch(input);
3073 done_pipe(ctx,PIPE_AND);
3074 } else {
3075#ifndef __U_BOOT__
3076 done_pipe(ctx,PIPE_BG);
3077#else
3078 syntax_err();
3079 return 1;
3080#endif
3081 }
3082 break;
3083 case '|':
3084 done_word(dest, ctx);
3085 if (next=='|') {
3086 b_getch(input);
3087 done_pipe(ctx,PIPE_OR);
3088 } else {
3089 /* we could pick up a file descriptor choice here
3090 * with redirect_opt_num(), but bash doesn't do it.
3091 * "echo foo 2| cat" yields "foo 2". */
3092#ifndef __U_BOOT__
3093 done_command(ctx);
3094#else
3095 syntax_err();
3096 return 1;
3097#endif
3098 }
3099 break;
3100#ifndef __U_BOOT__
3101 case '(':
3102 case '{':
3103 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3104 break;
3105 case ')':
3106 case '}':
3107 syntax(); /* Proper use of this character caught by end_trigger */
3108 return 1;
3109 break;
3110#endif
Joe Hershberger38de0b62012-08-17 10:26:30 +00003111 case SUBSTED_VAR_SYMBOL:
3112 dest->nonnull = 1;
3113 while (ch = b_getch(input), ch != EOF &&
3114 ch != SUBSTED_VAR_SYMBOL) {
3115 debug_printf("subst, pass=%d\n", ch);
3116 if (input->__promptme == 0)
3117 return 1;
3118 b_addchr(dest, ch);
3119 }
3120 debug_printf("subst, term=%d\n", ch);
3121 if (ch == EOF) {
3122 syntax();
3123 return 1;
3124 }
3125 break;
wdenkfe8c2802002-11-03 00:38:21 +00003126 default:
3127 syntax(); /* this is really an internal logic error */
3128 return 1;
3129 }
3130 }
3131 }
3132 /* complain if quote? No, maybe we just finished a command substitution
3133 * that was quoted. Example:
3134 * $ echo "`cat foo` plus more"
3135 * and we just got the EOF generated by the subshell that ran "cat foo"
3136 * The only real complaint is if we got an EOF when end_trigger != '\0',
3137 * that is, we were really supposed to get end_trigger, and never got
3138 * one before the EOF. Can't use the standard "syntax error" return code,
3139 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3140 debug_printf("leaving parse_stream (EOF)\n");
3141 if (end_trigger != '\0') return -1;
3142 return 0;
3143}
3144
Kim Phillipsb052b602012-10-29 13:34:32 +00003145static void mapset(const unsigned char *set, int code)
wdenkfe8c2802002-11-03 00:38:21 +00003146{
3147 const unsigned char *s;
3148 for (s=set; *s; s++) map[*s] = code;
3149}
3150
Kim Phillipsb052b602012-10-29 13:34:32 +00003151static void update_ifs_map(void)
wdenkfe8c2802002-11-03 00:38:21 +00003152{
3153 /* char *ifs and char map[256] are both globals. */
Simon Glass64b723f2017-08-03 12:22:12 -06003154 ifs = (uchar *)env_get("IFS");
Wolfgang Denk7fb52662005-10-13 16:45:02 +02003155 if (ifs == NULL) ifs=(uchar *)" \t\n";
wdenkfe8c2802002-11-03 00:38:21 +00003156 /* Precompute a list of 'flow through' behavior so it can be treated
3157 * quickly up front. Computation is necessary because of IFS.
3158 * Special case handling of IFS == " \t\n" is not implemented.
3159 * The map[] array only really needs two bits each, and on most machines
3160 * that would be faster because of the reduced L1 cache footprint.
3161 */
3162 memset(map,0,sizeof(map)); /* most characters flow through always */
3163#ifndef __U_BOOT__
Wolfgang Denk7fb52662005-10-13 16:45:02 +02003164 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3165 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
wdenkfe8c2802002-11-03 00:38:21 +00003166#else
Joe Hershberger38de0b62012-08-17 10:26:30 +00003167 {
3168 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0};
3169 mapset(subst, 3); /* never flow through */
3170 }
Wolfgang Denk7fb52662005-10-13 16:45:02 +02003171 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3172 mapset((uchar *)";&|#", 1); /* flow through if quoted */
wdenkfe8c2802002-11-03 00:38:21 +00003173#endif
3174 mapset(ifs, 2); /* also flow through if quoted */
3175}
3176
3177/* most recursion does not come through here, the exeception is
3178 * from builtin_source() */
Kim Phillipsb052b602012-10-29 13:34:32 +00003179static int parse_stream_outer(struct in_str *inp, int flag)
wdenkfe8c2802002-11-03 00:38:21 +00003180{
3181
3182 struct p_context ctx;
3183 o_string temp=NULL_O_STRING;
3184 int rcode;
3185#ifdef __U_BOOT__
Rabin Vincentc3249b82014-10-29 23:21:41 +01003186 int code = 1;
wdenkfe8c2802002-11-03 00:38:21 +00003187#endif
3188 do {
3189 ctx.type = flag;
3190 initialize_context(&ctx);
3191 update_ifs_map();
Wolfgang Denk7fb52662005-10-13 16:45:02 +02003192 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
wdenkfe8c2802002-11-03 00:38:21 +00003193 inp->promptmode=1;
Simon Glass94cb9c22014-10-07 13:59:43 -06003194 rcode = parse_stream(&temp, &ctx, inp,
3195 flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n');
wdenkfe8c2802002-11-03 00:38:21 +00003196#ifdef __U_BOOT__
3197 if (rcode == 1) flag_repeat = 0;
3198#endif
3199 if (rcode != 1 && ctx.old_flag != 0) {
3200 syntax();
3201#ifdef __U_BOOT__
3202 flag_repeat = 0;
3203#endif
3204 }
3205 if (rcode != 1 && ctx.old_flag == 0) {
3206 done_word(&temp, &ctx);
3207 done_pipe(&ctx,PIPE_SEQ);
3208#ifndef __U_BOOT__
3209 run_list(ctx.list_head);
3210#else
wdenk6203e402004-04-18 10:13:26 +00003211 code = run_list(ctx.list_head);
3212 if (code == -2) { /* exit */
3213 b_free(&temp);
3214 code = 0;
3215 /* XXX hackish way to not allow exit from main loop */
3216 if (inp->peek == file_peek) {
3217 printf("exit not allowed from main input shell.\n");
3218 continue;
3219 }
Marek Vasutfd099322022-12-20 07:25:59 +01003220 /*
3221 * DANGER
3222 * Return code -2 is special in this context,
3223 * it indicates exit from inner pipe instead
3224 * of return code itself, the return code is
3225 * stored in 'last_return_code' variable!
3226 * DANGER
3227 */
3228 return -2;
wdenk6203e402004-04-18 10:13:26 +00003229 }
3230 if (code == -1)
wdenkfe8c2802002-11-03 00:38:21 +00003231 flag_repeat = 0;
3232#endif
3233 } else {
3234 if (ctx.old_flag != 0) {
3235 free(ctx.stack);
3236 b_reset(&temp);
3237 }
3238#ifdef __U_BOOT__
3239 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3240 inp->__promptme = 1;
3241#endif
3242 temp.nonnull = 0;
3243 temp.quote = 0;
3244 inp->p = NULL;
3245 free_pipe_list(ctx.list_head,0);
3246 }
3247 b_free(&temp);
Simon Glass29617102014-05-30 14:41:50 -06003248 /* loop on syntax errors, return on EOF */
Rabin Vincentae68a822014-11-21 23:05:22 +01003249 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) &&
Simon Glass29617102014-05-30 14:41:50 -06003250 (inp->peek != static_peek || b_peek(inp)));
wdenkfe8c2802002-11-03 00:38:21 +00003251#ifndef __U_BOOT__
3252 return 0;
3253#else
3254 return (code != 0) ? 1 : 0;
3255#endif /* __U_BOOT__ */
3256}
3257
3258#ifndef __U_BOOT__
3259static int parse_string_outer(const char *s, int flag)
3260#else
Jason Hobbsa56febb2011-08-31 05:37:24 +00003261int parse_string_outer(const char *s, int flag)
wdenkfe8c2802002-11-03 00:38:21 +00003262#endif /* __U_BOOT__ */
3263{
3264 struct in_str input;
Marek Vasutfd099322022-12-20 07:25:59 +01003265 int rcode;
wdenkfe8c2802002-11-03 00:38:21 +00003266#ifdef __U_BOOT__
3267 char *p = NULL;
Rabin Vincent401ac652014-10-29 23:21:39 +01003268 if (!s)
wdenkfe8c2802002-11-03 00:38:21 +00003269 return 1;
Rabin Vincent401ac652014-10-29 23:21:39 +01003270 if (!*s)
3271 return 0;
wdenkfe8c2802002-11-03 00:38:21 +00003272 if (!(p = strchr(s, '\n')) || *++p) {
3273 p = xmalloc(strlen(s) + 2);
3274 strcpy(p, s);
3275 strcat(p, "\n");
3276 setup_string_in_str(&input, p);
3277 rcode = parse_stream_outer(&input, flag);
3278 free(p);
Marek Vasutfd099322022-12-20 07:25:59 +01003279 return rcode == -2 ? last_return_code : rcode;
wdenkfe8c2802002-11-03 00:38:21 +00003280 } else {
3281#endif
3282 setup_string_in_str(&input, s);
Marek Vasutfd099322022-12-20 07:25:59 +01003283 rcode = parse_stream_outer(&input, flag);
3284 return rcode == -2 ? last_return_code : rcode;
wdenkfe8c2802002-11-03 00:38:21 +00003285#ifdef __U_BOOT__
3286 }
3287#endif
3288}
3289
3290#ifndef __U_BOOT__
3291static int parse_file_outer(FILE *f)
3292#else
3293int parse_file_outer(void)
3294#endif
3295{
3296 int rcode;
3297 struct in_str input;
3298#ifndef __U_BOOT__
3299 setup_file_in_str(&input, f);
3300#else
3301 setup_file_in_str(&input);
3302#endif
3303 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
Marek Vasutfd099322022-12-20 07:25:59 +01003304 return rcode == -2 ? last_return_code : rcode;
wdenkfe8c2802002-11-03 00:38:21 +00003305}
3306
3307#ifdef __U_BOOT__
3308int u_boot_hush_start(void)
3309{
wdenkbd1575f2003-10-14 19:43:55 +00003310 if (top_vars == NULL) {
3311 top_vars = malloc(sizeof(struct variables));
3312 top_vars->name = "HUSH_VERSION";
3313 top_vars->value = "0.01";
Kim Phillipsb052b602012-10-29 13:34:32 +00003314 top_vars->next = NULL;
wdenkbd1575f2003-10-14 19:43:55 +00003315 top_vars->flg_export = 0;
3316 top_vars->flg_read_only = 1;
wdenkbd1575f2003-10-14 19:43:55 +00003317 }
wdenkfe8c2802002-11-03 00:38:21 +00003318 return 0;
3319}
3320
3321static void *xmalloc(size_t size)
3322{
3323 void *p = NULL;
3324
3325 if (!(p = malloc(size))) {
peng.wang@smartm.comd18973c2021-05-04 01:45:59 -07003326 printf("ERROR : xmalloc failed\n");
wdenkfe8c2802002-11-03 00:38:21 +00003327 for(;;);
3328 }
3329 return p;
3330}
3331
3332static void *xrealloc(void *ptr, size_t size)
3333{
3334 void *p = NULL;
3335
3336 if (!(p = realloc(ptr, size))) {
peng.wang@smartm.comd18973c2021-05-04 01:45:59 -07003337 printf("ERROR : xrealloc failed\n");
wdenkfe8c2802002-11-03 00:38:21 +00003338 for(;;);
3339 }
3340 return p;
3341}
3342#endif /* __U_BOOT__ */
3343
3344#ifndef __U_BOOT__
3345/* Make sure we have a controlling tty. If we get started under a job
3346 * aware app (like bash for example), make sure we are now in charge so
3347 * we don't fight over who gets the foreground */
wdenke7f34c62003-01-11 09:48:40 +00003348static void setup_job_control(void)
wdenkfe8c2802002-11-03 00:38:21 +00003349{
3350 static pid_t shell_pgrp;
3351 /* Loop until we are in the foreground. */
3352 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3353 kill (- shell_pgrp, SIGTTIN);
3354
3355 /* Ignore interactive and job-control signals. */
3356 signal(SIGINT, SIG_IGN);
3357 signal(SIGQUIT, SIG_IGN);
3358 signal(SIGTERM, SIG_IGN);
3359 signal(SIGTSTP, SIG_IGN);
3360 signal(SIGTTIN, SIG_IGN);
3361 signal(SIGTTOU, SIG_IGN);
3362 signal(SIGCHLD, SIG_IGN);
3363
3364 /* Put ourselves in our own process group. */
3365 setsid();
3366 shell_pgrp = getpid ();
3367 setpgid (shell_pgrp, shell_pgrp);
3368
3369 /* Grab control of the terminal. */
3370 tcsetpgrp(shell_terminal, shell_pgrp);
3371}
3372
Wolfgang Denk6262d0212010-06-28 22:00:46 +02003373int hush_main(int argc, char * const *argv)
wdenkfe8c2802002-11-03 00:38:21 +00003374{
3375 int opt;
3376 FILE *input;
3377 char **e = environ;
3378
3379 /* XXX what should these be while sourcing /etc/profile? */
3380 global_argc = argc;
3381 global_argv = argv;
3382
3383 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3384 * hush_main(), therefore we cannot rely on the BSS to zero out this
3385 * stuff. Reset these to 0 every time. */
3386 ifs = NULL;
3387 /* map[] is taken care of with call to update_ifs_map() */
3388 fake_mode = 0;
3389 interactive = 0;
3390 close_me_head = NULL;
3391 last_bg_pid = 0;
3392 job_list = NULL;
3393 last_jobid = 0;
3394
3395 /* Initialize some more globals to non-zero values */
3396 set_cwd();
wdenke7f34c62003-01-11 09:48:40 +00003397#ifdef CONFIG_FEATURE_COMMAND_EDITING
wdenkfe8c2802002-11-03 00:38:21 +00003398 cmdedit_set_initial_prompt();
3399#else
3400 PS1 = NULL;
3401#endif
3402 PS2 = "> ";
3403
3404 /* initialize our shell local variables with the values
3405 * currently living in the environment */
3406 if (e) {
3407 for (; *e; e++)
3408 set_local_var(*e, 2); /* without call putenv() */
3409 }
3410
3411 last_return_code=EXIT_SUCCESS;
3412
3413
3414 if (argv[0] && argv[0][0] == '-') {
3415 debug_printf("\nsourcing /etc/profile\n");
3416 if ((input = fopen("/etc/profile", "r")) != NULL) {
3417 mark_open(fileno(input));
3418 parse_file_outer(input);
3419 mark_closed(fileno(input));
3420 fclose(input);
3421 }
3422 }
3423 input=stdin;
3424
3425 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3426 switch (opt) {
3427 case 'c':
3428 {
3429 global_argv = argv+optind;
3430 global_argc = argc-optind;
3431 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3432 goto final_return;
3433 }
3434 break;
3435 case 'i':
3436 interactive++;
3437 break;
3438 case 'f':
3439 fake_mode++;
3440 break;
3441 default:
3442#ifndef BB_VER
3443 fprintf(stderr, "Usage: sh [FILE]...\n"
3444 " or: sh -c command [args]...\n\n");
3445 exit(EXIT_FAILURE);
3446#else
3447 show_usage();
3448#endif
3449 }
3450 }
3451 /* A shell is interactive if the `-i' flag was given, or if all of
3452 * the following conditions are met:
3453 * no -c command
3454 * no arguments remaining or the -s flag given
3455 * standard input is a terminal
3456 * standard output is a terminal
3457 * Refer to Posix.2, the description of the `sh' utility. */
3458 if (argv[optind]==NULL && input==stdin &&
3459 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3460 interactive++;
3461 }
3462
3463 debug_printf("\ninteractive=%d\n", interactive);
3464 if (interactive) {
3465 /* Looks like they want an interactive shell */
wdenk57b2d802003-06-27 21:31:46 +00003466#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
wdenke7f34c62003-01-11 09:48:40 +00003467 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3468 printf( "Enter 'help' for a list of built-in commands.\n\n");
3469#endif
wdenkfe8c2802002-11-03 00:38:21 +00003470 setup_job_control();
3471 }
3472
3473 if (argv[optind]==NULL) {
3474 opt=parse_file_outer(stdin);
3475 goto final_return;
3476 }
3477
3478 debug_printf("\nrunning script '%s'\n", argv[optind]);
3479 global_argv = argv+optind;
3480 global_argc = argc-optind;
3481 input = xfopen(argv[optind], "r");
3482 opt = parse_file_outer(input);
3483
wdenke7f34c62003-01-11 09:48:40 +00003484#ifdef CONFIG_FEATURE_CLEAN_UP
wdenkfe8c2802002-11-03 00:38:21 +00003485 fclose(input);
3486 if (cwd && cwd != unknown)
3487 free((char*)cwd);
3488 {
3489 struct variables *cur, *tmp;
3490 for(cur = top_vars; cur; cur = tmp) {
3491 tmp = cur->next;
3492 if (!cur->flg_read_only) {
3493 free(cur->name);
3494 free(cur->value);
3495 free(cur);
3496 }
3497 }
3498 }
3499#endif
3500
3501final_return:
3502 return(opt?opt:last_return_code);
3503}
3504#endif
3505
3506static char *insert_var_value(char *inp)
3507{
Joe Hershberger38de0b62012-08-17 10:26:30 +00003508 return insert_var_value_sub(inp, 0);
3509}
3510
3511static char *insert_var_value_sub(char *inp, int tag_subst)
3512{
wdenkfe8c2802002-11-03 00:38:21 +00003513 int res_str_len = 0;
3514 int len;
3515 int done = 0;
3516 char *p, *p1, *res_str = NULL;
3517
3518 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
Nishanth Menon0978ef32015-12-04 13:02:11 -06003519 /* check the beginning of the string for normal characters */
wdenkfe8c2802002-11-03 00:38:21 +00003520 if (p != inp) {
Nishanth Menon0978ef32015-12-04 13:02:11 -06003521 /* copy any characters to the result string */
wdenkfe8c2802002-11-03 00:38:21 +00003522 len = p - inp;
3523 res_str = xrealloc(res_str, (res_str_len + len));
3524 strncpy((res_str + res_str_len), inp, len);
3525 res_str_len += len;
3526 }
3527 inp = ++p;
Joe Hershberger38de0b62012-08-17 10:26:30 +00003528 /* find the ending marker */
wdenkfe8c2802002-11-03 00:38:21 +00003529 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3530 *p = '\0';
Joe Hershberger38de0b62012-08-17 10:26:30 +00003531 /* look up the value to substitute */
wdenkfe8c2802002-11-03 00:38:21 +00003532 if ((p1 = lookup_param(inp))) {
Joe Hershberger38de0b62012-08-17 10:26:30 +00003533 if (tag_subst)
3534 len = res_str_len + strlen(p1) + 2;
3535 else
3536 len = res_str_len + strlen(p1);
wdenkfe8c2802002-11-03 00:38:21 +00003537 res_str = xrealloc(res_str, (1 + len));
Joe Hershberger38de0b62012-08-17 10:26:30 +00003538 if (tag_subst) {
3539 /*
3540 * copy the variable value to the result
3541 * string
3542 */
3543 strcpy((res_str + res_str_len + 1), p1);
3544
3545 /*
3546 * mark the replaced text to be accepted as
3547 * is
3548 */
3549 res_str[res_str_len] = SUBSTED_VAR_SYMBOL;
3550 res_str[res_str_len + 1 + strlen(p1)] =
3551 SUBSTED_VAR_SYMBOL;
3552 } else
3553 /*
3554 * copy the variable value to the result
3555 * string
3556 */
3557 strcpy((res_str + res_str_len), p1);
3558
wdenkfe8c2802002-11-03 00:38:21 +00003559 res_str_len = len;
3560 }
3561 *p = SPECIAL_VAR_SYMBOL;
3562 inp = ++p;
3563 done = 1;
3564 }
3565 if (done) {
3566 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3567 strcpy((res_str + res_str_len), inp);
3568 while ((p = strchr(res_str, '\n'))) {
3569 *p = ' ';
3570 }
3571 }
3572 return (res_str == NULL) ? inp : res_str;
3573}
3574
3575static char **make_list_in(char **inp, char *name)
3576{
3577 int len, i;
3578 int name_len = strlen(name);
3579 int n = 0;
3580 char **list;
3581 char *p1, *p2, *p3;
3582
3583 /* create list of variable values */
3584 list = xmalloc(sizeof(*list));
3585 for (i = 0; inp[i]; i++) {
3586 p3 = insert_var_value(inp[i]);
3587 p1 = p3;
3588 while (*p1) {
Jeroen Hofstee95ab0d32014-06-11 00:28:47 +02003589 if (*p1 == ' ') {
wdenkfe8c2802002-11-03 00:38:21 +00003590 p1++;
3591 continue;
3592 }
3593 if ((p2 = strchr(p1, ' '))) {
3594 len = p2 - p1;
3595 } else {
3596 len = strlen(p1);
3597 p2 = p1 + len;
3598 }
3599 /* we use n + 2 in realloc for list,because we add
3600 * new element and then we will add NULL element */
3601 list = xrealloc(list, sizeof(*list) * (n + 2));
3602 list[n] = xmalloc(2 + name_len + len);
3603 strcpy(list[n], name);
3604 strcat(list[n], "=");
3605 strncat(list[n], p1, len);
3606 list[n++][name_len + len + 1] = '\0';
3607 p1 = p2;
3608 }
3609 if (p3 != inp[i]) free(p3);
3610 }
3611 list[n] = NULL;
3612 return list;
3613}
3614
Stephen Warren60c38c92014-03-01 22:16:10 -07003615/*
3616 * Make new string for parser
3617 * inp - array of argument strings to flatten
3618 * nonnull - indicates argument was quoted when originally parsed
3619 */
3620static char *make_string(char **inp, int *nonnull)
wdenkfe8c2802002-11-03 00:38:21 +00003621{
3622 char *p;
3623 char *str = NULL;
3624 int n;
3625 int len = 2;
Joe Hershberger38de0b62012-08-17 10:26:30 +00003626 char *noeval_str;
3627 int noeval = 0;
wdenkfe8c2802002-11-03 00:38:21 +00003628
Joe Hershberger38de0b62012-08-17 10:26:30 +00003629 noeval_str = get_local_var("HUSH_NO_EVAL");
3630 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0')
3631 noeval = 1;
wdenkfe8c2802002-11-03 00:38:21 +00003632 for (n = 0; inp[n]; n++) {
Joe Hershberger38de0b62012-08-17 10:26:30 +00003633 p = insert_var_value_sub(inp[n], noeval);
Stephen Warren60c38c92014-03-01 22:16:10 -07003634 str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n])));
wdenkfe8c2802002-11-03 00:38:21 +00003635 if (n) {
3636 strcat(str, " ");
3637 } else {
3638 *str = '\0';
3639 }
Stephen Warren60c38c92014-03-01 22:16:10 -07003640 if (nonnull[n])
3641 strcat(str, "'");
wdenkfe8c2802002-11-03 00:38:21 +00003642 strcat(str, p);
Stephen Warren60c38c92014-03-01 22:16:10 -07003643 if (nonnull[n])
3644 strcat(str, "'");
wdenkfe8c2802002-11-03 00:38:21 +00003645 len = strlen(str) + 3;
3646 if (p != inp[n]) free(p);
3647 }
3648 len = strlen(str);
3649 *(str + len) = '\n';
3650 *(str + len + 1) = '\0';
3651 return str;
3652}
3653
Heiko Schocher49ebcb52008-10-15 09:40:28 +02003654#ifdef __U_BOOT__
Simon Glassed38aef2020-05-10 11:40:03 -06003655static int do_showvar(struct cmd_tbl *cmdtp, int flag, int argc,
3656 char *const argv[])
Heiko Schocher49ebcb52008-10-15 09:40:28 +02003657{
3658 int i, k;
3659 int rcode = 0;
3660 struct variables *cur;
3661
3662 if (argc == 1) { /* Print all env variables */
3663 for (cur = top_vars; cur; cur = cur->next) {
3664 printf ("%s=%s\n", cur->name, cur->value);
3665 if (ctrlc ()) {
3666 puts ("\n ** Abort\n");
3667 return 1;
3668 }
3669 }
3670 return 0;
3671 }
3672 for (i = 1; i < argc; ++i) { /* print single env variables */
3673 char *name = argv[i];
3674
3675 k = -1;
3676 for (cur = top_vars; cur; cur = cur->next) {
3677 if(strcmp (cur->name, name) == 0) {
3678 k = 0;
3679 printf ("%s=%s\n", cur->name, cur->value);
3680 }
3681 if (ctrlc ()) {
3682 puts ("\n ** Abort\n");
3683 return 1;
3684 }
3685 }
3686 if (k < 0) {
3687 printf ("## Error: \"%s\" not defined\n", name);
3688 rcode ++;
3689 }
3690 }
3691 return rcode;
3692}
3693
3694U_BOOT_CMD(
Jean-Christophe PLAGNIOL-VILLARD03836942008-10-16 15:01:15 +02003695 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
Peter Tyserdfb72b82009-01-27 18:03:12 -06003696 "print local hushshell variables",
Heiko Schocher49ebcb52008-10-15 09:40:28 +02003697 "\n - print values of all hushshell variables\n"
3698 "showvar name ...\n"
Wolfgang Denkc54781c2009-05-24 17:06:54 +02003699 " - print value of hushshell variable 'name'"
Heiko Schocher49ebcb52008-10-15 09:40:28 +02003700);
3701
3702#endif
wdenkfe8c2802002-11-03 00:38:21 +00003703/****************************************************************************/